JP4258180B2 - Color filter and liquid crystal display device - Google Patents

Description

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【表３】

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【発明の効果】
本発明のカラーフィルター、及びこれを用いた液晶表示装置により、上述のごとく印刷物と同等の色鮮やかさをもち、かつＩＴＯ断線等の欠陥のない優れた表示が可能となる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color filter and a liquid crystal display device using the same, and particularly to a color filter and a liquid crystal display device having a wide color reproduction range.
[0002]
[Prior art]
Currently, liquid crystal display devices are used in various applications such as notebook PCs, portable information terminals, and digital cameras, taking advantage of characteristics such as light weight, thinness, and low power consumption. Due to the improved display characteristics (brightness, color reproducibility, viewing angle characteristics, etc.) of liquid crystal display devices, the use of liquid crystal display devices has been expanded to desktop monitor applications in addition to conventional notebook PC applications. . Furthermore, recently, large-sized liquid crystal televisions that further improve the color reproducibility of desktop monitors have been developed, and colors close to the color reproduction range of CRTs are being reproduced. Here, the color reproduction range is represented by an area ratio with respect to the NTSC (National Television System Committee) standard of a triangle formed by connecting the chromaticity coordinates of red, green, and blue in the XYZ color system chromaticity diagram.
[0003]
The color reproduction range of CRT is about 72% of the NTSC standard, and the chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram of red, green, blue, and each color are red (0.640, 0.330), respectively. ), Green (0.290, 0.600), and blue (0.150, 0.060), which are almost equal to the European Broadcasting Union (EBU) standard. However, even with existing CRTs or displays that have the widest color reproduction range among liquid crystal displays and comply with the EBU standard, color reproduction in the green region is particularly insufficient, and vivid displays such as printed matter are displayed. It was difficult to do.
[0004]
The color reproducibility is wider than the EBU standard, and the above-mentioned NTSC standard is a good standard. The chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram of red, green, blue, and each color are red ( 0.670, 0.330), green (0.210, 0.710), and blue (0.140, 0.080). When the chromaticity close to the coordinates can be satisfied, it is possible to display the same as a printed matter.
[0005]
In order to manufacture a liquid crystal display device with an expanded color reproduction range, the color filter pixel may be darkened by thickening the pixels of the color filter.
[0006]
However, in the case of a desktop monitor or a liquid crystal display device used for a liquid crystal television set as conventionally produced, that is, a liquid crystal display device having a color reproducibility of NTSC ratio 72% (EBU standard) or less, the red pixel of the color filter In many cases, PR254 is used as a main pigment, and in some cases, PY150 or PY138 is used as a sub-pigment in combination, and a green pixel is used as a main pigment as disclosed in, for example, JP-A-9-203808. PG36 is often used in combination with PY150 or PY138 as a sub-pigment, and blue pixels are often toned using PB15: 6 alone. Color reproduction using such a pigment system A liquid crystal display device with broader characteristics, especially a liquid crystal display device with a color reproducibility of 80% or more than NTSC If the, for each color pixel thickness of the color filter is too large beyond the practical range, there are cases where the step of the color filter surface is increased, ITO disconnection or the liquid crystal orientation defect occurs. In addition, it is difficult to form a pattern in a pixel having a large film thickness, and the taper is increased, so that the resolution may be lowered or a crack may occur.
[0007]
Japanese Patent Application Laid-Open No. 6-174909 describes a color filter with a high color reproduction range, but the film thickness is not described, and the brightness and contrast are extremely reduced due to the large particle size of the pigment. There was a problem.
[0008]
[Problems to be solved by the invention]
The present invention was devised in view of the drawbacks of the prior art, and is to provide a liquid crystal display device that achieves high color reproducibility equivalent to NTSC with a practical film thickness.
[0009]
[Means for Solving the Problems]
As a result of intensive investigations to solve the problems of the prior art, the present inventors have found the following color filters.
(1)In a color filter having at least three pixels of red, green and blue,The area of the triangle connecting the chromaticity coordinates of red, green, and blue in the XYZ color system chromaticity diagram measured using a C light source is the NTSC standard ratio.88.7% to 105.1%And each pixel thickness is1.5 μm or more, 3.5below μmThus, at least one selected from Pigment Red 177 and / or Pigment Red 254 as the coloring component of the red pixel and at least one selected from Pigment Green 7, Pigment Yellow 17, Pigment Yellow 150, and Pigment Yellow 185 as the coloring component of the green pixel. Pigment blue 15: 6 and pigment violet 23 as the coloring component of the blue pixel, and the average particle size of the pigment contained in the red and green pixels is 100 nm or less, and the average particle size of the pigment contained in the blue pixel The diameter is 200 nm or lessA color filter characterized by that.
(2) The chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram measured using the C light source are0.662≦ x ≦0.690,0.306≦ y ≦0.337The color filter according to (1), wherein the color filter has a red pixel that satisfies each of the following formulas.
(3) The chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram measured using the C light source are0.201≦ x ≦0.288,0.647≦ y ≦0.686The color filter according to any one of (1) and (2), wherein the color filter has a green pixel that satisfies each of the following expressions.
(4) The chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram measured using the C light source are0.141≦ x ≦0.145,0.045≦ y ≦0.069The color filter according to any one of (1) to (3), wherein the color filter has a blue pixel that satisfies each of the following formulas.
(5 (1) to (1) characterized in that polyimide resin is included as a resin component of each pixel.4) The color filter according to any one of
(6) A liquid crystal display device using the color filter according to claim 1.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The color filter of the present invention has pixels of at least three colors of red, green, and blue, and connects each chromaticity coordinate of red, green, and blue in an XYZ color system chromaticity diagram measured using a C light source. It is preferable that the area (color reproduction range) of the triangle is 80% or more of NTSC standard ratio. This is because when the color filter is in this range, a good display quality equivalent to a printed matter can be obtained when the liquid crystal display device is used. And it is more preferably 85% or more, still more preferably 90% or more, and most preferably 95% or more.
[0011]
The chromaticity range (x, y) of each color pixel that is preferable for obtaining a good display equivalent to a printed matter satisfies the following expressions: 0.635 ≦ x ≦ 0.695 and 0.300 ≦ y ≦ 0.350. Red pixel, 0.190 ≦ x ≦ 0.320, green pixel satisfying each expression of 0.580 ≦ y ≦ 0.687, 0.130 ≦ x ≦ 0.160, 0.040 ≦ y ≦ 0.100 Blue pixels satisfying the respective expressions, more preferably, red pixels satisfying the respective expressions of 0.655 ≦ x ≦ 0.695 and 0.300 ≦ y ≦ 0.340, 0.200 ≦ x ≦ 0.310, A green pixel that satisfies each expression of 0.600 ≦ y ≦ 0.687, a blue pixel that satisfies each expression of 0.130 ≦ x ≦ 0.160, 0.040 ≦ y ≦ 0.090, and more preferably, Red image that satisfies the following formulas: 0.665 ≦ x ≦ 0.695, 0.300 ≦ y ≦ 0.330 , 0.200 ≦ x ≦ 0.300, green pixel satisfying each equation of 0.625 ≦ y ≦ 0.687, 0.130 ≦ x ≦ 0.160, 0.040 ≦ y ≦ 0.080 And most preferably a red pixel satisfying the expressions 0.675 ≦ x ≦ 0.695 and 0.300 ≦ y ≦ 0.330, 0.200 ≦ x ≦ 0.300, 0. It is a green pixel that satisfies each expression of 650 ≦ y ≦ 0.687, and a blue pixel that satisfies each expression of 0.130 ≦ x ≦ 0.160 and 0.040 ≦ y ≦ 0.070.
[0012]
Each color pixel is not preferable in a region where the color is lighter than the above chromaticity range because display with high color reproducibility cannot be performed. Further, in a region where the color is darker than the above chromaticity range, the transmittance of the image is lowered, and the luminance of the liquid crystal display device is lowered. In the color filter of the present invention, the preferable luminance range is such that the Y value of white with a C light source is preferably 10 or more, more preferably 12 or more. A white Y value of 10 or less is not preferable because bright display may not be possible.
[0013]
One or more kinds of various pigments can be used in order to obtain a pixel having the above color characteristics, and other pigments may be added as long as the color characteristics are not impaired. As an example of a typical pigment,
Pigment Red (PR-) 2, 3, 9, 22, 38, 81, 97, 122, 123, 144, 146, 149, 166, 168, 169, 177, 179, 180, 190, 192, 206, 207, 209, 215, 216, 224, 242, 254, 266, Pigment Orange (PO-) 5, 13, 17, 31, 36, 38, 40, 42, 43, 51, 55, 59, 61, 64, 65, 71, Pigment Yellow (PY-) 12, 13, 14, 17, 20, 24, 83, 86, 93, 94, 95, 109, 110, 117, 125, 129, 137, 138, 139, 147, 148, 150, 153, 154, 155, 166, 173, 180, 185, Pigment Blue (PB-) 15 (15: 1, 15: 2, 15: 3, 15: 15: 6), 16, 17, 21, 22, 60, 64, pigment violet (PV-) 19, 23, 29, 30, 32, 33, 36, 37, 38, 40, 50, pigment green (PG) -) 7, 10, 36, 37, 38, 47 etc. are mentioned. If necessary, the pigment may be subjected to surface treatment such as rosin treatment, acidic group treatment, basic treatment, pigment derivative treatment and the like.
[0014]
In the present invention, various pigments can be used without being limited to the above-mentioned pigments. However, the red pixel is PR254, because the color tone and coloring power are high and the film can be thinned, and the color purity is easily increased. It is preferable that the color is adjusted to include at least one of PR122, PR177, PR178, and PR179, and PY139 can also be preferably used as an auxiliary pigment. In particular, a combination including both PR254 and PR177, a combination including both PR254 and PR179, a combination including both PR177 and PY139, a combination including both PR177 and PY179, or a combination including both PR254 and PR122. Alternatively, the PR177 single system and the PR122 single system are more preferable because the film thickness is 4 μm or less and the NTSC ratio is 80% or more.
[0015]
When color matching is performed using both PR254 and PR177 as a red pixel, the weight ratio of PR177 in all pigments is preferably 20 to 90%, and the weight ratio of PR254 is preferably 10 to 80%. The weight ratio of PR177 Is more preferably 35 to 85% and the weight ratio of PR254 is 15 to 65%.
[0016]
When toning using PR179, the weight ratio of PR179 is preferably within 60%. Further, when PR254 and / or PR177 and PY139 are combined, the weight ratio of PY139 is preferably within 25%, more preferably within 20%.
[0017]
In addition, when toning by combining both PR254 and PR122, the weight ratio of PR122 in all pigments is preferably 10 to 90%, the weight ratio of PR254 is preferably 10 to 90%, and the weight ratio of PR122 is 10%. It is more preferable that the weight ratio of ˜50% and PR254 is 50˜90%.
[0018]
The above pigment composition ratio is preferable because it is a preferable color as red and, depending on the color purity of other pixels, when the pigment concentration is 30% or more, the film thickness is 4 μm or less and the NTSC ratio is easily 80% or more. .
[0019]
The green pixel is preferably composed mainly of PG7 as a main pigment because the film thickness is 4 μm or less and the NTSC ratio is easily 80% or more. Further, as a result of examination, when PG7 and PG36 are mixed and used as the main pigment, the transmittance and contrast ratio of the green pixel are increased, so that the present invention can be preferably performed. When PG7 and PG36 are mixed and used, the weight ratio of PG36 in the all green pigment is preferably 2 to 65%, more preferably 5 to 55%, and still more preferably 15 to 35%. When the weight ratio of PG36 in the all green pigment exceeds 65%, the color reproduction range may be lowered, which is not preferable. On the other hand, when the weight ratio of PG36 is less than 2%, the effect of improving the transmittance and contrast ratio is small, which is not preferable.
[0020]
The sub-pigment of the green pixel is preferably toned to include at least one of PY12, PY13, PY17, PY83, PY109, PY110, PY138, PY139, PY150, and PY185, and in particular, PY17, PY138, PY139, It is more preferable that the toning is performed including at least one of PY150 and PY185. However, PY138 is preferably used in combination with other yellow pigments for thinning in the high color purity region. Specifically, a combination including both PG7 and PY139, a combination including PG7, PY138, and PY139, a combination including PG7, PY139, and PY150, a combination including PG7, PY138, and PY185, or a combination including PG7 and PY150, A film thickness of 4 μm or less is preferable because it is easy to achieve an NTSC ratio of 80% or more. In addition to these, it is also preferable to mix PG7 and PG36 as green pigments as described above.
[0021]
As a green pixel, it is preferable that the weight ratio of the green pigment in all the pigments is 40 to 90%, and it is more preferable that it is 45 to 85%.
[0022]
If the added amount of the green pigment is less than the above, the film thickness of the pixel becomes large, which is not preferable. If it exceeds the above amount, the color may not be suitable as a green pixel. When toning using PY17 as a sub-pigment for a green pixel, the weight ratio of PY17 in all pigments is preferably 20 to 60%, and more preferably 30 to 60%. When toning using PY138, the weight ratio of PY138 in all pigments is preferably 20 to 60%, and more preferably 30 to 60%. When toning using PY139, the weight ratio of PY139 in all pigments is preferably 5 to 40%, more preferably 5 to 30%, and even more preferably 5 to 20%. When toning using PY150, the weight ratio of PY150 in all pigments is preferably 5 to 50%, more preferably 5 to 40%, and even more preferably 10 to 40%. When toning using PY185, the weight ratio of PY185 in all pigments is preferably 5 to 40%, more preferably 5 to 30%, and even more preferably 5 to 20%. These yellow pigments may be used in combination of two or more. The above pigment composition ratio is preferable as a green color, and depending on the color purity of other pixels, when the pigment concentration is 35% or more, the film thickness is 4 μm or less and the NTSC ratio is easily 80% or more. This is because if it is 40% or more, the NTSC ratio tends to be 90% or more.
[0023]
The blue pixel is preferably toned with PB 15: 6 as the main pigment and PV 23 as the sub-pigment because the film thickness is 4 μm or less and the NTSC ratio is easily 80% or more.
As a blue pixel, in the case of toning by combining PB15: 6 and PV23, the weight ratio of PB15: 6 in all pigments is preferably 70 to 90%, and the weight ratio of PV23 is preferably 10 to 30%. More preferably, the weight ratio of PB15: 6 is 75 to 90%, the weight ratio of PV23 is 10 to 25%, the weight ratio of PB15: 6 is 75 to 85%, and the weight ratio of PV23 is 15 to 25%. It is even better to be. The above pigment composition ratio is preferable as a blue color, and depending on the color purity of other pixels, but when the pigment concentration is 20% or more, the film thickness is 4 μm or less and the NTSC ratio is easily 80% or more. This is because if it is 20% or more, the NTSC ratio tends to be 90% or more. If the added amount of PV23 is too small, the pixel film thickness becomes large, which is not preferable. If it exceeds the above amount, the color may not be suitable as a blue pixel.
[0024]
The pigment used in the color filter of the present invention preferably has a small primary particle size in order to obtain high transmittance and contrast ratio. As a specific primary particle size range, pigments used for red and green pixels, that is, red pigments, green pigments, yellow pigments, and the like are preferably 100 nm or less, more preferably 75 nm or less, and still more preferably 60 nm or less. In addition, pigments used for blue pixels, that is, blue and purple pigments, are preferably 200 nm or less, more preferably 150 nm or less, and still more preferably 100 nm or less. In order to obtain a high transmittance and contrast ratio, it is particularly preferable that the average particle diameter of the pigment contained in each color pixel coating film of the color filter is in the above range, and in particular, the green color having a large influence on the transmittance and contrast of the color filter. It is preferable that the average particle diameter of the pigment in the pixel is in the above range. The pigment particle size can be measured, for example, by observing a pixel cross section using a scanning electron microscope (SEM).
[0025]
The contrast of the color filter of the present invention is preferably 500 or more, more preferably 600 or more, still more preferably 800 or more, and most preferably 1000 or more. If the contrast is less than 500, the light scattered by the color filter leaks out when the display is used, and the display may lack sharpness and the image quality may be insufficient.
[0026]
The thickness of each color pixel in the color filter of the present invention is preferably 4 μm or less. More preferably, it is 3.5 μm or less, more preferably 3 μm or less, and most preferably 2.5 μm or less. When the film thickness exceeds 4 μm, the level difference on the surface of the color filter becomes large, which may cause disconnection of ITO or poor liquid crystal alignment. Further, it is not preferable for a pixel having a film thickness of more than 4 μm because pattern formation is difficult and the taper is increased, so that the resolution is lowered and cracks are generated due to increased stress applied to the pattern.
[0027]
The film thickness has a correlation with the weight ratio between the colorant and the resin component in each color pixel. A preferable colorant / resin component ratio (wt%) in each color pixel is preferably 30/70 or more, more preferably 35/65 or more, and further preferably 40/60 or more in the red pixel. In a green pixel, it is preferably 35/65 or more, more preferably 40/60 or more, and further preferably 45/55 or more. In a blue pixel, Preferably it is 20/80 or more, More preferably, it is 25/75 or more, More preferably, it is 30/70 or more. If the amount of the resin component is too small, there is an effect that the film thickness can be reduced, but pattern peeling due to lowering of adhesion to the substrate or cracking due to lowering of coating film strength may occur, making pattern formation difficult. . Conversely, if the amount of the pigment is too small, the degree of coloration will decrease, so the film thickness for obtaining chromaticity of NTSC ratio of 80% or more will increase, and as described above, the problem of the level difference on the surface of the color filter or pattern formation The above problem may occur.
[0028]
Next, an example of a method for producing a color paste used for producing the color filter of the present invention will be described.
[0029]
The color paste used in the present invention is obtained by dispersing or dissolving a colorant in a resin. As a method of dispersing or dissolving the colorant, a known technique can be used. A resin and a colorant are mixed in a solvent and dispersed in a dispersing machine such as a ball mill, or dissolved by a stirrer, and a color paste. Get. In order to stabilize the dispersion of the pigment, a polymer intermediate such as a pigment intermediate, derivative, dye intermediate, derivative, “Solsperse” (Avicia), “EFKA” (Efka), etc. A publicly known thing can be used.
[0030]
As the pigment dispersant, in the present invention, a compound having a sulfonic acid derivative structure introduced into the pigment skeleton is preferably used because the pigment dispersibility is improved and high transmittance and contrast ratio can be obtained. A compound having a sulfonic acid derivative structure introduced into the pigment skeleton is, for example, a sulfonic acid group or an alkali metal salt, ammonium salt, or amine salt of sulfonic acid introduced into a skeleton that is at least partially similar to the molecular structure of the pigment used. It is a compound having a structure or a structure in which a sulfonamide structure, a sulfonic acid ester structure or the like is introduced. Usually, the sulfonic acid derivative structure is introduced into the aromatic ring of the pigment skeleton, but is not particularly limited. Further, the number of sulfonic acid derivative structures to be introduced is not particularly limited, and may be one per molecule or two or more. Moreover, the single introduction | transduction pure derivative | guide_body with the same introduction number and introduction position may be sufficient, and a mixture of different things may be sufficient.
[0031]
A compound in which a sulfonic acid derivative structure is introduced into the pigment skeleton as described above is synthesized, for example, by the following method. A pigment or a similar compound is added to concentrated sulfuric acid, fuming sulfuric acid, chlorosulfonic acid, or a mixture thereof to carry out a sulfonation reaction. The reaction solution is preferably diluted with a large amount of water, or neutralized with a metal alkali aqueous solution or an amine aqueous solution. The obtained suspension is filtered, washed with an aqueous washing solution, and dried.
[0032]
Dispersants having a sulfonic acid derivative structure incorporated into the pigment skeleton as described above are effective for any pigment regardless of color, but are particularly effective in that the phthalocyanine pigment, quinophthalone pigment, diketo It is preferably used for pyrrolopyrrole pigments, anthraquinone pigments, and quinacridone pigments. Among these, although not particularly limited, PB15: 6, PG36, PY138, PR177, PR254, PR122, etc. are effective, and compounds having a sulfonic acid derivative structure introduced into these structures or similar structures are added. When dispersed in this manner, the dispersion stability is improved and aggregation can be prevented, so that the brightness and contrast are improved.
[0033]
The resin of the color paste is not particularly limited, and a resin usually used for a color filter, that is, a resin such as acrylic, epoxy, or polyamic acid can be preferably used. Depending on the resin used, it can be a non-photosensitive car paste or a photosensitive color paste, which can be appropriately selected according to the color filter manufacturing process.
[0034]
Hereinafter, the case where polyamic acid is used as a typical example of the non-photosensitive color paste and an acrylic resin is used as a typical example of the photosensitive color paste will be described in detail.
[0035]
A polyamic acid can be obtained by reacting a tetracarboxylic dianhydride and a diamine.
[0036]
In the synthesis of the polyamic acid in the present invention, for example, an aliphatic or alicyclic one can be used as the tetracarboxylic dianhydride, and specific examples thereof include 1,2,3,4. -Cyclobutanetetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, 1,2,3,5-cyclopentanetetracarboxylic dianhydride, 1,2,4,5 -Bicyclohexene tetracarboxylic dianhydride, 1,2,4,5-cyclohexanetetracarboxylic dianhydride, 1,3,3a, 4,5,9b-hexahydro-5- (tetrahydro-2,5-dioxo -3-furanyl) -naphtho [1,2-C] furan-1,3-dione and the like. In addition, when an aromatic material is used, a polyamic acid that can be converted into a film having good heat resistance can be obtained. As a specific example, 3,3 ′, 4,4′-benzophenonetetracarboxylic acid Dianhydride, pyromellitic dianhydride, 3,4,9,10-perylenetetracarboxylic dianhydride, 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride, 4,4 ′ -Oxydiphthalic anhydride, 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride, 1,2,5,6-naphthalenetetracarboxylic dianhydride, 3,3 ", 4,4"- Examples include paraterphenyl tetracarboxylic dianhydride and 3,3 ″, 4,4 ″ -metaterphenyl tetracarboxylic dianhydride. In addition, when a fluorine-based material is used, a polyamic acid that can be converted into a film having good transparency in a short wavelength region can be obtained. As a specific example, 4,4 ′-(hexafluoroisopropylidene ) Diphthalic anhydride. In addition, this invention is not limited to these, The tetracarboxylic dianhydride is used 1 type (s) or 2 or more types.
[0037]
In the synthesis of the polyamic acid in the present invention, for example, an aliphatic or alicyclic diamine can be used, and specific examples thereof include ethylenediamine, 1,3-diaminocyclohexane, 1 , 4-diaminocyclohexane, 4,4′-diamino-3,3′-dimethyldicyclohexylmethane, 4,4′-diamino-3,3′-dimethyldicyclohexyl, and the like. In addition, when an aromatic material is used, a polyamic acid that can be converted into a film having good heat resistance can be obtained. Specific examples thereof include 4,4′-diaminodiphenyl ether and 3,4′-diamino. Diphenyl ether, 4,4′-diaminodiphenylmethane, 3,3′-diaminodiphenylmethane, 4,4′-diaminodiphenylsulfone, 3,3′-diaminodiphenylsulfone, 4,4′-diaminodiphenylsulfide, m-phenylenediamine, p-phenylenediamine, 2,4-diaminotoluene, 2,5-diaminotoluene, 2,6-diaminotoluene, benzidine, 3,3'-dimethylbenzidine, 3,3'-dimethoxybenzidine, o-tolidine, 4, 4 "-diaminoterphenyl, 1,5-diaminonaphthalene, 3,3'-dimethyl 4,4'-diaminodiphenylmethane, 4,4'-bis (4-aminophenoxy) biphenyl, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, bis [4- (4-aminophenoxy) Phenyl] ether, bis [4- (4-aminophenoxy) phenyl] sulfone, bis [4- (3-aminophenoxy) phenyl] sulfone, etc. When a fluorine-based one is used, a short wavelength is used. A polyamic acid that can be converted into a film having excellent transparency in the region can be obtained. Specific examples thereof include 2,2-bis [4- (4-aminophenoxy) phenyl] hexafluoropropane. It is done.
[0038]
Moreover, when siloxane diamine is used as a part of diamine, the adhesiveness with an inorganic substrate can be made favorable. Siloxane diamine is usually used in an amount of 1 to 20 mol% in the total diamine. If the amount of siloxane diamine is too small, the effect of improving adhesiveness is not exhibited, and if it is too large, the heat resistance is lowered. Specific examples of the siloxane diamine include bis-3- (aminopropyl) tetramethylsiloxane. The present invention is not limited to this, and one or more diamines are used.
[0039]
In general, the polyamic acid is synthesized by mixing and reacting a tetracarboxylic dianhydride and a diamine in a polar organic solvent. At this time, the polymerization degree of the resulting polyamic acid can be adjusted by the mixing ratio of diamine and tetracarboxylic dianhydride.
[0040]
In addition, there are various methods for obtaining polyamic acid, such as reacting tetracarboxylic acid dichloride and diamine in a polar organic solvent and then removing hydrochloric acid and the solvent to obtain polyamic acid. However, the present invention can be applied to a polyamic acid regardless of the synthesis method.
[0041]
Next, the number of repeating structural units of the polyamic acid used in the color paste of the present invention will be described. Since the mechanical properties of the polyimide film are better as the molecular weight is larger, it is desirable that the molecular weight of the polyamic acid that is the polyimide precursor is also larger. On the other hand, when pattern processing is performed on the polyimide precursor film by wet etching, if the molecular weight of the polyamic acid is too large, there is a problem that the time required for development becomes too long. Therefore, the preferable range of the number of repeating structural units is 15 to 1000, more preferably 18 to 400, and still more preferably 20 to 100. In addition, since the molecular weight of polyamic acid generally varies, the preferable range of the number of repeating structural units here is 50 mol% or more, preferably 70 mol% or more of the total polyamic acid, Preferably, it means that 90 mol% or more is contained.
[0042]
An acrylic resin will be described as an example of the resin for the photosensitive color paste. The acrylic resin generally has a configuration containing at least an acrylic polymer, an acrylic polyfunctional monomer or oligomer, and a photopolymerization initiator in order to provide photosensitivity.
[0043]
The acrylic polymer that can be used is not particularly limited, but a copolymer of an unsaturated carboxylic acid and an ethylenically unsaturated compound can be preferably used. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid, and acid anhydrides.
[0044]
These may be used alone or in combination with other copolymerizable ethylenically unsaturated compounds. Specific examples of the copolymerizable ethylenically unsaturated compound include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, isopropyl acrylate, n-propyl methacrylate, and methacrylic acid. Isopropyl, n-butyl acrylate, n-butyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, iso-butyl acrylate, iso-butyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, N-pentyl acrylate, n-pentyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, and other unsaturated carboxylic acid alkyl esters, styrene, p-methyls Rene, aromatic vinyl compounds such as o-methylstyrene, m-methylstyrene and α-methylstyrene, unsaturated carboxylic acid aminoalkyl esters such as aminoethyl acrylate, unsaturated carboxylic acid glycidyl esters such as glycidyl acrylate and glycidyl methacrylate, Carboxylic acid vinyl esters such as vinyl acetate and vinyl propionate, vinyl cyanide compounds such as acrylonitrile, methacrylonitrile, and α-chloroacrylonitrile, aliphatic conjugated dienes such as 1,3-butadiene and isoprene, acryloyl groups at the terminals, Alternatively, macromonomers such as polystyrene, polymethyl acrylate, polymethyl methacrylate, polybutyl acrylate, polybutyl methacrylate, and polysilicone having a methacryloyl group And the like, but is not limited to these.
[0045]
Further, when an acrylic polymer having an ethylenically unsaturated group added to the side chain is used, it can be preferably used because the sensitivity during processing is improved. Examples of ethylenically unsaturated groups include vinyl groups, allyl groups, acrylic groups, and methacrylic groups. As a method of adding such a side chain to an acrylic (co) polymer, when the acrylic (co) polymer has a carboxyl group or a hydroxyl group, an ethylenically unsaturated compound having a glycidyl group therein In general, an addition reaction of acrylic acid or methacrylic acid chloride is used. In addition, a compound having an ethylenically unsaturated group can be added using isocyanate. Examples of the ethylenically unsaturated compound having glycidyl group and acrylic acid or methacrylic acid chloride include glycidyl acrylate, glycidyl methacrylate, glycidyl α-ethyl acrylate, crotonyl glycidyl ether, glycidyl crotonic acid, and glycidyl isocrotonate. Examples include ether, acrylic acid chloride, and methacrylic acid chloride.
[0046]
Examples of the polyfunctional monomer include bisphenol A diglycidyl ether (meth) acrylate, poly (meth) acrylate carbamate, modified bisphenol A epoxy (meth) acrylate, adipic acid 1,6-hexanediol (meth) acrylic acid ester, anhydrous Phthalic acid propylene oxide (meth) acrylic acid ester, trimellitic acid diethylene glycol (meth) acrylic acid ester, rosin modified epoxy di (meth) acrylate, oligomer such as alkyd modified (meth) acrylate, or tripropylene glycol di (meth) acrylate 1,6-hexanediol di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, trimethylolpropane tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, triacrylformal, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate. These can be used alone or in combination. In addition, the following monofunctional monomers can be used in combination, for example, ethyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, hydroxyethyl (meth) acrylate, n-butyl methacrylate, glycidyl methacrylate, lauryl ( There are meth) acrylate, stearyl (meth) acrylate, isobornyl (meth) acrylate and the like, and a mixture of two or more of these or a mixture with other compounds is used. By selecting and combining these polyfunctional and monofunctional monomers and oligomers, it is possible to control the sensitivity and processability characteristics of the paste. In particular, a methacrylate compound is preferable to an acrylate compound for increasing the hardness, and a compound having 3 or more functional groups is preferable for increasing the sensitivity. Melamines and guanamines can also be preferably used in place of the acrylic monomers.
[0047]
There are no particular limitations on the photopolymerization initiator, and known ones can be used, such as benzophenone, N, N′-tetraethyl-4,4′-diaminobenzophenone, 4-methoxy-4′-dimethylaminobenzophenone, 2 , 2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyldimethyl ketal, α-hydroxyisobutylphenone, thioxanthone, 2-chlorothioxanthone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholino-1-propane, t-butylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chloro-2-methylanthraquinone, 2-ethylanthraquinone, 1, 4-naphthoquinone, 9,10-phenanthraquinone, 1,2-benzoanthraquinone, 1,4-dimethylanthraquinone, 2-phenylanthraquinone, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, etc. Can be given. Further, inorganic photopolymerization initiators such as other acetophenone compounds, imidazole compounds, benzophenone compounds, thioxanthone compounds, phosphorus compounds, triazine compounds, and titanates can also be preferably used. Further, it is preferable to add a sensitizing aid such as p-dimethylaminobenzoic acid ester because the sensitivity can be further improved. Moreover, these photoinitiators can also be used in combination of 2 or more types.
[0048]
The addition amount of the photopolymerization initiator is not particularly limited, but is preferably 1 to 30 wt%, more preferably 5 to 25 wt%, and still more preferably 10 to 20 wt% with respect to the total solid content of the paste.
[0049]
In the color paste of the present invention, from the viewpoints of coating properties and drying properties, the solid content concentration of the resin component and the pigment is 2 to 30%, preferably 3 to 25%, more preferably 5 to 20%. Use within the range.
[0050]
As the solvent in the color paste used in the present invention, a polyamic acid to be used or a solvent capable of dissolving the acrylic resin can be preferably used. Examples of the solvent for dissolving polyamic acid include amide polar solvents such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide, β-propiolactone, γ-butyrolactone, γ- Examples include lactones such as valerolactone, δ-valerolactone, γ-caprolactone, and ε-caprolactone. In the case of acrylic resins, in addition to these, for example, ethylene glycol or propylene glycol derivatives such as methyl cellosolve, ethyl cellosolve, methyl carbitol, ethyl carbitol, propylene glycol monoethyl ether, or propylene glycol monoethyl ether Aliphatic esters such as acetate, ethyl acetoacetate, methyl-3-methoxypropionate, 3-methyl-3-methoxybutylacetate, or aliphatic alcohols such as ethanol, 3-methyl-3-methoxybutanol, It is also possible to use ketones such as cyclopentanone and cyclohexanone.
[0051]
Therefore, as the solvent for the color paste used in the present invention, it is preferable to use a single solvent or a mixed solvent of two or more solvents for dissolving the resin used, as appropriate. In this case, a poor solvent for the resin to be used can be used as the auxiliary solvent. The preferred solvent is not particularly limited, and examples thereof include a mixed solvent of N-methylpyrrolidone and cyclopentanone. Particularly in the case of an acrylic resin, cyclopentanone alone can be preferably used. .
[0052]
In the color paste used in the present invention, a surfactant may be added for the purpose of improving the coating property and the drying property of the colored film. The addition amount of the surfactant is usually 0.001 to 10% by weight, preferably 0.01 to 1% by weight of the pigment. If the addition amount is too small, there is no effect of improving the coatability and the drying property of the colored coating film, and if it is too large, the physical properties of the coating film may be poor. Specific examples of the surfactant include anionic surfactants such as ammonium lauryl sulfate and polyoxyethylene alkyl ether sulfate triethanolamine, cationic surfactants such as stearylamine acetate and lauryltrimethylammonium chloride, lauryldimethylamine oxide, Amphoteric surfactants such as lauryl carboxymethyl hydroxyethyl imidazolium betaine, nonionic surfactants such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, sorbitan monostearate, and silicones based on polydimethylsiloxane Surfactant etc. are mentioned. In the present invention, the surfactant is not limited to these, and one or more surfactants can be used. In addition to the surfactant, an adhesion improver, a curing accelerator, and the like can be added.
[0053]
A method for producing the color filter of the present invention will be described.
As a method of applying the color paste on the substrate, a method of applying to the substrate by a spin coater, a bar coater, a blade coater, a roll coater, a die coater, a screen printing method, a method of immersing the substrate in a solution, a solution Various methods such as spraying on the substrate can be used. As the substrate, a transparent substrate such as soda glass, non-alkali glass, borosilicate glass, or quartz glass, or a semiconductor substrate such as silicon or gallium arsenide is usually used, but is not particularly limited thereto. In addition, when applying a color paste on a substrate, if the substrate surface is treated with an adhesion aid such as a silane coupling agent, an aluminum chelating agent, or a titanium chelating agent, the adhesion between the colored coating and the substrate is improved. Can be done as needed.
[0054]
After the color paste is applied on the transparent substrate by the method as described above, a coating film of the color paste is formed by air drying, heat drying, vacuum drying or the like. In the case of heat-drying, it is preferable to use an oven, a hot plate, etc., and carry out at 50-180 degreeC for 1 minute-3 hours. Next, when the color paste is non-photosensitive, a photoresist is applied on the color paste coating to form a photoresist coating. In the case of a photosensitive color paste, a photoresist is not necessary, but an oxygen blocking film may be formed if necessary. Subsequently, a mask is placed on the coating and irradiated with ultraviolet rays using an exposure apparatus. Next, the color paste coating film is etched with an alkali developer. When there is a photoresist film or an oxygen barrier film, the development or etching of these is performed at the same time, and then these are removed with a stripping solution.
[0055]
Although it does not specifically limit as an alkaline substance used for the alkali developing solution used for this invention, For example, inorganic alkalis, such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, etc. Primary amines such as ethylamine and n-propylamine, secondary amines such as diethylamine and di-n-propylamine, tertiary amines such as triethylamine and methyldiethylamine, and tetramethylammonium hydroxide (TMAH). Tetraalkylammonium hydroxides, quaternary ammonium salts such as choline, triethanolamine, diethanolamine, monoethanolamine, dimethylaminoethanol, diethylaminoethanol and other alcohol amines, pyrrole, piperidy , 1,8-diazabicyclo [5,4,0] -7-undecene, 1,5-diazabicyclo [4,3,0] -5-nonane, organic alkalis such as cyclic amines such as morpholine.
Although depending on development conditions and coating film conditions, organic alkalis are more preferable than inorganic alkalis because they often have less film peeling during development.
[0056]
Among organic alkalis, hydroxyl-containing organic amines such as tetraalkylammonium hydroxides and alcohol amines can be used more preferably because they are particularly excellent in permeability to etching films.
Specifically, although not particularly limited, diethylaminoethanol, dimethylaminoethanol, and TMAH are preferable.
The concentration of the alkaline substance is 0.01% to 50% by weight. Preferably it is 0.05 weight% to 10 weight%, More preferably, it is 0.1 to 1 weight%. In the case where the developer is an alkaline aqueous solution, a water-soluble organic solvent such as ethanol, γ-butyrolactone, dimethylformamide, N-methyl-2-pyrrolidone may be appropriately added to the developer.
[0057]
The coating pattern of the obtained color paste becomes a color filter patterned by heat treatment thereafter. The heat treatment is usually performed in air, in a nitrogen atmosphere, or in a vacuum at a temperature of 150 to 350 ° C., preferably 180 to 300 ° C., for 0.5 to 5 hours continuously or stepwise. Done. By this heating step, the polyimide precursor is converted into polyimide, and the photosensitive acrylic resin is cured.
[0058]
When the patterning process as described above is sequentially performed using each color paste of red, green, blue, and the like, and if necessary, a black color paste, a color filter for a liquid crystal display device can be produced. Here, the patterning order of each color is not limited.
[0059]
Next, a liquid crystal display device produced using the color filter of the present invention will be described. The present invention includes Twisted Nematic (TN), Super Twisted Nematic (STN), In-Plane Switching (IPS), Vertical Alignment (VA), Optically Convencence Bend (OCB), etc. It can be applied to a liquid crystal display mode in which colorization is performed using a color filter. Since the color filter of the present invention has a low transmittance due to the wide color reproduction range, the liquid crystal display mode to be applied is a TN or VA mode, a wide range in that the aperture ratio is relatively high and bright display is possible. The IPS or VA mode is preferable in that a viewing angle can be obtained. The VA mode is more preferable in that a bright display is possible and a wide viewing angle.
[0060]
Hereinafter, a manufacturing method of a TN mode liquid crystal display device will be described as a specific example, but the present invention is not limited thereto.
[0061]
A transparent protective film is formed on the color filter as necessary, and a transparent electrode such as an ITO film is further formed thereon. Furthermore, a liquid crystal alignment film subjected to rubbing treatment for liquid crystal alignment is provided thereon. Next, the color filter substrate and a transparent electrode substrate on which a transparent electrode such as an ITO film is formed on the transparent substrate are bonded to each other through a spacer for maintaining a cell gap. In addition to the transparent electrode, a thin film transistor (TFT) element, a thin film diode (TFD) element, a scanning line, a signal line, and the like are provided on the transparent electrode substrate to create a TFT liquid crystal display device and a TFD liquid crystal display device. be able to. Next, after injecting liquid crystal from the injection port provided in the seal portion, the injection port is sealed. Next, after a polarizing plate is bonded to the outside of the substrate, an IC driver or the like is mounted to complete a liquid crystal display device.
[0062]
【Example】
EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these.
[0063]
In addition, the measuring method in an Example is as follows.
<Chromaticity>
The spectral transmittance and color coordinates of the color filter were measured using a microspectrophotometer “MCPD-2000” manufactured by Otsuka Electronics Co., Ltd. The color coordinates are values with a C light source measured under the condition of a 2 ° visual field.
<Film thickness>
Measured with Surfcom 1200A manufactured by Tokyo Seimitsu.
<Pigment average particle diameter>
Using a scanning electron microscope "S-900H" manufactured by Hitachi, Ltd., taking a cross-sectional picture of each pixel of the color filter at 50000 times, all 40 contained within a continuous area region containing 40 pigment particles The particle size of the pigment particles was measured, and the average value was defined as the pigment average particle size. Even when two or more pigment particles seemed to gather together, each was counted as a separate particle as long as it could be distinguished. When the particle shape is not spherical, such as an ellipse or a needle, the longest diameter (major axis) and the shortest diameter (minor axis) are measured, and (major axis + minor axis) / 2 is the particle diameter of the particle. did.
<Contrast ratio>
The ratio between the light transmittance (I1) when the color filter substrate is placed between the polarizer and the analyzer, and the polarizer and analyzer are parallel, and the light transmittance (I2) when the polarizer and analyzer are orthogonal It was measured by measuring (I1 / I2). A polarizing film “NPF-G1220DUN” manufactured by Nitto Denko Corporation was used for the polarizer and the analyzer. As a light source, a backlight unit using a hot cathode tube, “FL8A-EX / 70” manufactured by Meidaku System was used. The brightness of light transmitted through two polarizing films with a color filter substrate inserted between them is measured using a color luminance meter, Topcon's “BM-5A”, with a field of view of 1 °. The ratio was determined.
[0064]
Example 1
A. Synthesis of polyamic acid
4,5′-Diaminodiphenyl ether 95.1 g and bis (3-aminopropyl) tetramethyldisiloxane 6.2 g were charged together with 525 g of γ-butyrolactone and 220 g of N-methyl-2-pyrrolidone. After adding 144.1 g of '-biphenyltetracarboxylic dianhydride and reacting at 70 ° C for 3 hours, adding 3.0 g of phthalic anhydride and further reacting at 70 ° C for 2 hours, 25% by weight of polyamic acid was added. An acid solution (PAA-1) was obtained.
[0065]
B. Synthesis of polymer dispersant
4,4′-diaminobenzanilide 161.3 g, 3,3′-diaminodiphenylsulfone 176.7 g, and bis (3-aminopropyl) tetramethyldisiloxane 18.6 g were replaced with γ-butyrolactone 2667 g, N-methyl-2 -Charged with 527 g of pyrrolidone, added 439.1 g of 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, reacted at 70 ° C. for 3 hours, then added 2.2 g of phthalic anhydride, Furthermore, it was made to react at 70 degreeC for 2 hours, and the 20 weight% polyamic acid solution (PD-1) was obtained.
[0066]
C. Creating a dispersion
Pigment Red PR254 2.88 g (60 wt% of the whole pigment, of which), Pigment Red PR177 1.92 g (40 wt%), polymer dispersant (PD-1) 2.67 g and γ-butyrolactone 81.4 g of glass beads 90 g Then, using a homogenizer, the mixture was dispersed at 7000 rpm for 5 hours, and then the glass beads were filtered and removed. In this way, a 6% dispersion of pigment PR254 and PR177 was obtained.
[0067]
D. Create color paste
A solution obtained by diluting 13.34 g of the polymer solution (PAA-1) with 22.82 g of γ-butyrolactone and 18.80 g of 3-methoxy-3-methyl-1-butanol was added to and mixed with 44.45 g of the dispersion, and then bic chemie. Surfactant “BYK361” manufactured by the company was added to a solid content of 1000 ppm to obtain a red paste. The pigment / polymer ratio (weight ratio) of this paste is 40/60. Similarly to the red paste, a green paste having a pigment weight composition of PG7 / PY17 = 65/35 and a pigment / polymer ratio (weight ratio) = 46/54, PB15: 6 / PV23 = 80/20, pigment A blue paste having a polymer ratio (weight ratio) of 28/72 was prepared.
[0068]
E. Create colored coating
First, a black color paste in which carbon black is dispersed in a polyamic acid resin is applied, dried at 120 ° C. for 20 minutes, and a positive photoresist (“OFPR-800” manufactured by Tokyo Ohka Co., Ltd.) is applied thereon. It was applied and dried at 90 ° C. for 10 minutes. Using a UV exposure machine “PLA-501F” manufactured by Canon Inc., it is 60 mJ / cm through a chrome photomask.²(UV intensity at 365 nm) Exposed. After the exposure, the film was immersed in a developer composed of a 2.25% aqueous solution of tetramethylammonium hydroxide, and development of the photoresist and etching of the colored coating film of the polyimide precursor were simultaneously performed. The photoresist layer that became unnecessary after etching was stripped with acetone. Furthermore, the colored coating film of the polyimide precursor was heat-treated at 240 ° C. for 30 minutes to convert to polyimide. A black matrix pattern was formed as described above. Next, a green paste produced by a spinner was applied, and a green pattern was formed by etching and heat treatment in the same manner as the black matrix pattern. Subsequently, a red paste and a blue paste were applied in the same manner, and a red pattern and a blue pattern were formed by etching and heat treatment to obtain a color filter. The film thicknesses of the red, green, and blue patterns were all 3.5 μm. Further, an overcoat agent “Optomer” (SS6917 + SS0917) manufactured by JSR Co., Ltd. was formed on the obtained color filter to a thickness of 1 μm, and an ITO film was further sputtered to a thickness of 0.14 μm.
[0069]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.316), green (0.201, 0.682), and blue, respectively. (0.145, 0.045), and the color reproduction range was 101.9% compared to the NTSC standard. At that time, the luminance Y of the color filter was 13.7 and the contrast was 550. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 70 nm for the green pixel, and 90 nm for the blue pixel.
[0070]
Separately, a substrate on which TFT elements, pixel electrodes, etc. are formed on alkali-free glass is prepared as a counter substrate, and an alignment film is printed on the substrate coated with the color paste (colored layer substrate) and the counter substrate, and then aligned. I let you. A sealing agent kneaded with a microrod was printed on one of these two substrates, and a bead spacer having a thickness of 5 μm was sprayed, and then the two substrates were bonded together. Next, TN liquid crystal (refractive index anisotropy Δn to 0.1) compatible with 4V driving was injected to close the liquid crystal injection port with a sealing agent. A liquid crystal cell into which liquid crystal was injected was sandwiched between orthogonal polarizing films to prepare a liquid crystal cell for evaluation. A liquid crystal display device was completed by mounting an IC driver or the like on the liquid crystal cell. As for the image quality of the obtained liquid crystal display device, a vivid display close to a printed matter was possible, and display defects due to ITO disconnection or the like were not observed.
[0071]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.316) was obtained. ), Green (0.201, 0.682), blue (0.145, 0.045), and the color reproduction range was 101.9% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0072]
Example 2
Except that the weight composition of the green paste pigment was PG7 / PY17 = 50/50, red, green and blue pastes were prepared in the same manner as in Example 1, and then a color filter was prepared.
[0073]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.316), green (0.226, 0.686), and blue, respectively. (0.145, 0.045), and the color reproduction range was 100.4% compared to the NTSC standard. At that time, the luminance Y of the color filter was 14.6 and the contrast was 550. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 80 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0074]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.316) was obtained. ), Green (0.226, 0.686), blue (0.145, 0.045), and the color reproduction range was 100.4% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0075]
Example 3
A color filter was produced in the same manner as in Example 1 except that the film thicknesses of the red, green, and blue patterns were 2.6 μm, 2.5 μm, and 2.0 μm, respectively.
[0076]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.670, 0.320), green (0.219, 0.655), and blue, respectively. (0.141, 0.064), and the color reproduction range was 92.5% compared to the NTSC standard. At that time, the luminance Y of the color filter was 17.4 and the contrast was 750. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 70 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0077]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when the chromaticity when measured through a C light source was measured in the same manner as described above, red (0.670, 0.320) was obtained. ), Green (0.219, 0.655), blue (0.141, 0.064), and the color reproduction range was 92.5% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0078]
Example 4
Red, green and blue pastes were prepared in the same manner as in Example 1 except that the weight composition of the pigment in the green paste was PG7 / PY150 = 45/55 and the pigment / polymer ratio (weight ratio) was 50/50. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.6 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0079]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.249, 0.656), and blue, respectively. (0.143, 0.069), and the color reproduction range was 90.0% compared with the NTSC standard. At that time, the luminance Y of the color filter was 18.4 and the contrast was 950. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0080]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.249, 0.656), blue (0.143, 0.069), and the color reproduction range was 90.0% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0081]
Example 5
Red, green and blue pastes were prepared in the same manner as in Example 1 except that the weight composition of the pigment in the green paste was PG7 / PY139 = 75/25 and the pigment / polymer ratio (weight ratio) was 50/50. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.5 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0082]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.288, 0.686), and blue, respectively. (0.143, 0.069), and the color reproduction range was 93.1% compared to the NTSC standard. At that time, the luminance Y of the color filter was 12.0 and the contrast was 700. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 65 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0083]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.288, 0.686), blue (0.143, 0.069), and the color reproduction range was 93.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0084]
Example 6
Red, green and blue pastes were prepared in the same manner as in Example 1 except that the weight composition of the pigment in the green paste was PG7 / PY185 = 70/30 and the pigment / polymer ratio (weight ratio) was 50/50. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.5 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
The chromaticity (x, y) of the obtained color filter when passing through the C light source is red (0.673, 0.320), green (0.236, 0.687), and blue (0.143), respectively. 0.069), and the color reproduction range was 97.5% compared to the NTSC standard. At that time, the luminance Y of the color filter was 13.4 and the contrast was 520. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 90 nm for the green pixel, and 90 nm for the blue pixel.
[0085]
Thus, using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0086]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.236, 0.687), blue (0.143, 0.069), and the color reproduction range was 97.5% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0087]
Example 7
The weight composition of the pigment in the red paste is PR254 / PR177 = 20/80, the weight composition of the pigment in the green paste is PG7 / PY17 = 55/45, and the pigment / polymer ratio (weight ratio) is 38/62. In the same manner as in Example 1, red, green and blue pastes were produced. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 2.6 μm, 2.5 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0088]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.320), green (0.250, 0.647), and blue, respectively. (0.143, 0.069), and the color reproduction range was 88.7% compared to the NTSC standard. At that time, the luminance Y of the color filter was 20.0 and the contrast was 750. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 74 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The image quality of the obtained liquid crystal display device was close to the printed matter, and vivid display was possible, and no display defect due to ITO disconnection or the like was found.
[0089]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.320) was obtained. ), Green (0.250, 0.647), blue (0.143, 0.069), and the color reproduction range was 88.7% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0090]
Example 8
The weight composition of the pigment in the red paste is PR254 / PR177 = 20/80, the pigment / polymer ratio (weight ratio) is 42/58, and the weight composition of the pigment in the green paste is PG7 / PY138 / PY185 = 50/35/15. A red, green and blue paste was prepared in the same manner as in Example 1 except that the pigment / polymer ratio (weight ratio) was 50/50. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 2.6 μm, 2.5 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0091]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.320), green (0.253, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 90.0% compared with the NTSC standard. At that time, the luminance Y of the color filter was 17.8, and the contrast was 550. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 78 nm for the green pixel, and 90 nm for the blue pixel.
[0092]
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The image quality of the obtained liquid crystal display device was close to the printed matter, and vivid display was possible, and no display defect due to ITO disconnection or the like was found.
[0093]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.320) was obtained. ), Green (0.253, 0.655), blue (0.143, 0.069), and the color reproduction range was 90.0% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0094]
Example 9
The red, green and blue pastes were the same as in Example 1 except that the weight composition of the pigment in the green paste was PG7 / PY138 / PY139 = 50/45/5 and the pigment / polymer ratio (weight ratio) was 50/50. Was made. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.6 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0095]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.255, 0.654), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.3% compared to the NTSC standard. At that time, the luminance Y of the color filter was 17.2 and the contrast was 850. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The image quality of the obtained liquid crystal display device was close to the printed matter, and vivid display was possible, and no display defect due to ITO disconnection or the like was found.
[0096]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.255, 0.654), blue (0.143, 0.069), and the color reproduction range was 89.3% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0097]
Example 10
The weight composition of the pigment in the red paste is PR177 / PY139 = 80/20, the weight composition of the pigment in the green paste is PG7 / PY138 / PY139 = 50/45/5, and the pigment / polymer ratio (weight ratio) is 50/50. Except that, red, green and blue pastes were produced in the same manner as in Example 1. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.4 μm, 2.6 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0098]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.255, 0.654), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.3% compared to the NTSC standard. At that time, the luminance Y of the color filter was 17.0 and the contrast was 800. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 65 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The image quality of the obtained liquid crystal display device was close to the printed matter, and vivid display was possible, and no display defect due to ITO disconnection or the like was found.
[0099]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.255, 0.654), blue (0.143, 0.069), and the color reproduction range was 89.3% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0100]
Example 11
The red, green and blue pastes were prepared in the same manner as in Example 5 except that the weight composition of the pigment in the red paste was PR254 / PR139 = 80/20 and the pigment / polymer ratio (weight ratio) of the blue paste was 25/75. Produced. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.6 μm, 2.5 μm, and 1.7 μm, respectively, and a color filter was produced in the same manner as in Example 5.
[0101]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.662, 0.337), green (0.288, 0.686), and blue, respectively. (0.142, 0.062), and the color reproduction range was 89.9% compared to the NTSC standard. At that time, the luminance Y of the color filter was 13.2 and the contrast was 680. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 65 nm for the red pixel, 65 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 5. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0102]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.662, 0.337) was obtained. ), Green (0.288, 0.686), blue (0.142, 0.062), and the color reproduction range was 89.9% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0103]
Example 12
Red, green and blue pastes were produced in the same manner as in Example 11 except that the weight composition of the pigment in the green paste was PG7 / PY139 / PY150 = 65/10/25. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.6 μm, 2.5 μm, and 1.7 μm, respectively, and a color filter was produced in the same manner as in Example 11.
[0104]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.662, 0.337), green (0.265, 0.679), and blue, respectively. (0.142, 0.062), and the color reproduction range was 90.7% compared to the NTSC standard. At that time, the luminance Y of the color filter was 15.4, and the contrast was 740. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 65 nm for the red pixel, 60 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 5. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0105]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.662, 0.337) was obtained. ), Green (0.265, 0.679), blue (0.142, 0.062), and the color reproduction range was 90.7% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0106]
Example 13
E. Preparation of pigment dispersion using acrylic polymer
Pigment Red PR254 5.4 g (60 wt% of the total pigment), Pigment Red PR 177 3.6 g (40 wt%), EFKA “EFKA” 47 (35% solution) 5.14 g as a dispersing agent, acrylic polymer, manufactured by Daicel Chemical “Cyclomer” ACA250 (45% solution) (4.0 g) and propylene glycol monomethyl ether acetate (71.86 g) were charged together with glass beads (90 g) and dispersed using a homogenizer at 7000 rpm for 5 hours, and then the glass beads were filtered and removed. In this way, a 14% solution of the dispersion composed of the pigments PR254 and PR177 was obtained.
[0107]
F. Creation of photosensitive acrylic color paste
Daicel Chemical's acrylic polymer “Cyclomer” ACA250 (45% solution) 6.67 g, Nippon Kayaku's multifunctional monomer “Kayarad” DPHA 1.8 g, Ciba Specialty Chemicals photoinitiator “Irgacure” "369" A solution obtained by diluting 1.8 g of propylene glycol monomethyl ether acetate with 29.74 g, a total of 40 g was added and mixed, and a surfactant "BYK361" manufactured by bic chemie was added to a total solid content of 1000 ppm. A paste was obtained. The pigment / polymer ratio (weight ratio) of this paste is 40/60. Similarly to the red paste, a green paste having a pigment weight composition of PG7 / PY17 = 65/35 and a pigment / polymer ratio (weight ratio) = 46/54, PB15: 6 / PV23 = 80/20, pigment A blue paste having a polymer ratio (weight ratio) of 28/72 was prepared.
[0108]
G. Preparation and evaluation of colored coatings
First, a black color paste was applied in the same manner as in Example 1 to form a black matrix. Next, the red paste was applied thereon with a spinner, and then heat-treated at 80 ° C. for 15 minutes to obtain a red paste coating film. Furthermore, a predetermined area is exposed through a negative mask, and “Emulgen” A-60 (HLB12.8, polyoxyethylene derivative)) (manufactured by Kao Corporation) is used as a nonionic surfactant in a 0.2% diethylaminoethanol aqueous solution. The patterning substrate was obtained by immersing and developing for 90 seconds with an alkali developer added at 0.1% with respect to the total amount of the developer, followed by washing with pure water. The obtained patterned substrate was held in a hot air oven at 200 ° C. for 30 minutes to cure the acrylic resin and obtain a colored pattern. Subsequently, similarly, green and blue pastes were applied and patterned to obtain a color filter. The film thicknesses of the red, green, and blue patterns were all 3.5 μm. Further, an overcoat agent “Optomer” (SS6917 + SS0917) manufactured by JSR Co., Ltd. was formed on the obtained color filter to a thickness of 1 μm, and an ITO film was further sputtered to a thickness of 0.14 μm.
[0109]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.316), green (0.201, 0.682), and blue, respectively. (0.145, 0.045), and the color reproduction range was 101.9% compared to the NTSC standard. At that time, the luminance Y of the color filter was 13.7 and the contrast was 550. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 70 nm for the green pixel, and 90 nm for the blue pixel.
[0110]
Separately, a substrate on which TFT elements, pixel electrodes, etc. are formed on alkali-free glass is prepared as a counter substrate, and an alignment film is printed on the substrate coated with the color paste (colored layer substrate) and the counter substrate, and then aligned. I let you. A sealing agent kneaded with a microrod was printed on one of these two substrates, and a bead spacer having a thickness of 5 μm was sprayed, and then the two substrates were bonded together. Next, TN liquid crystal (refractive index anisotropy Δn to 0.1) compatible with 4V driving was injected to close the liquid crystal injection port with a sealing agent. A liquid crystal cell into which liquid crystal was injected was sandwiched between orthogonal polarizing films to prepare a liquid crystal cell for evaluation. A liquid crystal display device was completed by mounting an IC driver or the like on the liquid crystal cell. As for the image quality of the obtained liquid crystal display device, a vivid display close to a printed matter was possible, and display defects due to ITO disconnection or the like were not observed.
[0111]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.316) was obtained. ), Green (0.201, 0.682), blue (0.145, 0.045), and the color reproduction range was 101.9% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0112]
Example 14
Red, green and blue pastes were prepared in the same manner as in Example 1 except that the weight composition of the pigment in the red paste was PR254 / PR122 = 70/30. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 3.5 μm, 3.5 μm, and 3.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0113]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.321), green (0.201, 0.682), and blue, respectively. (0.145, 0.045), and the color reproduction range was 101.8% compared to the NTSC standard. At that time, the luminance Y of the color filter was 13.5, and the contrast was 510. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 77 nm for the red pixel, 70 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0114]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when the chromaticity was measured when passing through a C light source in the same manner as described above, red (0.675, 0.321) was obtained. ), Green (0.201, 0.682), blue (0.145, 0.045), and the color reproduction range was 101.8% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0115]
Example 15
Red, green and blue pastes were produced in the same manner as in Example 5 except that the weight composition of the pigment in the red paste was PR254 / PR122 = 70/30. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 2.7 μm, 2.5 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0116]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.666, 0.323), green (0.288, 0.686), and blue, respectively. (0.143, 0.069), and the color reproduction range was 90.4% compared to the NTSC standard. At that time, the luminance Y of the color filter was 12.6 and the contrast was 800. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 77 nm for the red pixel, 65 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0117]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.666, 0.323) was obtained. ), Green (0.288, 0.686), blue (0.143, 0.069), and the color reproduction range was 90.4% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0118]
Example 16
Red, green and blue pastes were prepared in the same manner as in Example 1 except that the weight composition of the pigment in the red paste was PR177 = 100. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 3.5 μm, 3.5 μm, and 3.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0119]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.690, 0.306), green (0.201, 0.682), and blue, respectively. (0.145, 0.045), and the color reproduction range was 105.1% compared to the NTSC standard. At that time, the luminance Y of the color filter was 12.5 and the contrast was 600. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 70 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0120]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.690, 0.306) was obtained. ), Green (0.201, 0.682), blue (0.145, 0.045), and the color reproduction range was 105.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0121]
Example 17
Red, green and blue pastes were prepared in the same manner as in Example 5 except that the weight composition of the pigment in the red paste was PR177 = 100. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 2.7 μm, 2.5 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0122]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.678, 0.306), green (0.288, 0.686), and blue, respectively. (0.143, 0.069), and the color reproduction range was 93.5% compared to the NTSC standard. At that time, the luminance Y of the color filter was 11.5 and the contrast was 950. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 65 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0123]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.678, 0.306) was obtained. ), Green (0.288, 0.686), blue (0.143, 0.069), and the color reproduction range was 93.5% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0124]
Example 18
Red, green and blue pastes were prepared in the same manner as in Example 4 except that the weight composition of the pigment in the green paste was PG7 / PG36 / PY150 = 40/5/55. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0125]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.253, 0.656), and blue, respectively. (0.143, 0.069), and the color reproduction range was 90.0% compared with the NTSC standard. Further, the luminance Y of the color filter at that time was 18.7 and the contrast was 1050, and the luminance and contrast were higher than those in Example 4. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0126]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.253, 0.656), blue (0.143, 0.069), and the color reproduction range was 90.0% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0127]
Example 19
Red, green and blue pastes were prepared in the same manner as in Example 9 except that the weight composition of the pigment in the green paste was PG7 / PG36 / PY138 / PY139 = 40/15/40/5. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0128]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.259, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.1% compared to the NTSC standard. Further, the luminance Y of the color filter at that time was 17.5 and the contrast was 950, and the luminance and contrast were higher than in Example 9. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0129]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.259, 0.655), blue (0.143, 0.069), the color reproduction range was 89.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0130]
Example 20
Red, green and blue pastes were prepared in the same manner as in Example 19 except that PR177 and PR254 used for the red paste and PB15: 6 used for the blue paste had a large particle size. . Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0131]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.259, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.1% compared to the NTSC standard. In addition, the luminance Y of the color filter at that time was 17.4 and the contrast was 900, and the luminance and contrast were lower than those in Example 19 although they were within the practical range. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 110 nm for the red pixel, 55 nm for the green pixel, and 110 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0132]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.259, 0.655), blue (0.143, 0.069), the color reproduction range was 89.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0133]
Example 21
Red, green, and blue pastes were prepared in the same manner as in Example 19 except that the PG 36 used for the green paste was of a type having a large particle size. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0134]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.259, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.1% compared to the NTSC standard. In addition, the luminance Y of the color filter at that time was 17.2 and the contrast was 750, and the luminance and contrast were lower than those in Example 19 although they were within the practical range. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 80 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0135]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.259, 0.655), blue (0.143, 0.069), the color reproduction range was 89.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0136]
Example 22
PR177, PR254 used for the red paste, PG36 used for the green paste, PB15: 6 used for the blue paste, except that a large particle size type was used. Green and blue pastes were prepared. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0137]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.259, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.1% compared to the NTSC standard. Further, the luminance Y of the color filter at that time was 16.9 and the contrast was 510, and the luminance and contrast were significantly lower than those of Example 19 although it was within the practical range. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 110 nm for the red pixel, 105 nm for the green pixel, and 110 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0138]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.259, 0.655), blue (0.143, 0.069), the color reproduction range was 89.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0139]
Example 23
As a dispersant having a pigment derivative structure, red, green, blue, and PG36 sulfonic acid derivatives and PB15: 6 sulfonic acid derivatives were added in the same manner as in Example 19 except that 3 wt% of each pigment was replaced. A paste was prepared.
[0140]
A compound having a sulfonic acid derivative structure introduced into the pigment structure was prepared as follows. That is, fuming sulfuric acid (25% SO_Three) Into 78 g. After stirring for 3 hours, it was added on 150 g of ice. After standing for 30 minutes, the resulting suspension was filtered and the resulting product was washed with 30 ml of water. The product was put into 200 ml of water and neutralized with an aqueous ammonia solution (added with an aqueous ammonia solution until the pH reached 7). 45 g of ammonium chloride was added and stirred at 80 ° C. for 30 minutes, and the deposited precipitate was filtered at 60 ° C. The obtained wet crystal was washed with water and then dried at 80 ° C. to obtain 10 g of a pigment sulfonic acid derivative.
[0141]
Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0142]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.259, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.1% compared to the NTSC standard. In addition, the luminance Y of the color filter at that time was 17.7 and the contrast was 1050. The luminance and contrast were improved as compared with Example 19. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0143]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.259, 0.655), blue (0.143, 0.069), the color reproduction range was 89.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0144]
Example 24
As a dispersant having a pigment derivative structure, in addition to PG36 sulfonic acid derivative and PB15: 6 sulfonic acid derivative, PR177 sulfonic acid derivative and PR254 sulfonic acid derivative produced in the same manner as in Example 23 were added to each pigment. Red, green and blue pastes were prepared in the same manner as in Example 23 except that 3 wt% was added in a replacement form.
[0145]
Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0146]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.259, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.1% compared to the NTSC standard. Further, the luminance Y of the color filter at that time was 17.8 and the contrast was 1100, and the luminance and contrast were improved as compared with Example 23. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0147]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.259, 0.655), blue (0.143, 0.069), the color reproduction range was 89.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0148]
Example 25
As a dispersant having a pigment derivative structure, in addition to PG36 sulfonic acid derivative, PB15: 6 sulfonic acid derivative, PR177 sulfonic acid derivative, PR254 sulfonic acid derivative, a PY138 sulfonic acid derivative produced in the same manner as in Example 23, Red, green and blue pastes were prepared in the same manner as in Example 24 except that 3 wt% of the total amount of each pigment was added.
[0149]
Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.8 μm, 2.7 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0150]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.259, 0.655), and blue, respectively. (0.143, 0.069), and the color reproduction range was 89.1% compared to the NTSC standard. In addition, the luminance Y of the color filter at that time was 17.9 and the contrast was 1170, and the luminance and contrast were improved as compared with Example 24. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 55 nm for the red pixel, 55 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display close to printed matter, and display defects due to ITO disconnection or the like were not observed.
[0151]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.259, 0.655), blue (0.143, 0.069), the color reproduction range was 89.1% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0152]
Comparative Example 1
The weight composition of the pigment in the red paste is PR254 / PR177 = 20/80, the weight composition of the pigment in the green paste is PG7 / PY138 = 30/70, and the pigment / polymer ratio (weight ratio) is 52/48. In the same manner as in Example 1, red, green and blue pastes were produced. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.6 μm, 1.6 μm, and 1.7 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0153]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.320), green (0.288, 0.587), and blue, respectively. (0.142, 0.062), and the color reproduction range was 76.5% compared to the NTSC standard. At that time, the luminance Y of the color filter was 25.0 and the contrast was 1100. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 65 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. Although the image quality of the obtained liquid crystal display device was bright, it could not be said that the display was equivalent to the printed matter because the green color reproducibility was particularly insufficient. No display defects due to ITO disconnection or the like were found.
[0154]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.320) was obtained. ), Green (0.288, 0.587), blue (0.142, 0.062), and the color reproduction range was 76.5% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0155]
Comparative Example 2
The weight composition of the pigment in the red paste is PR254 / PR177 = 20/80, the weight composition of the pigment in the green paste is PG7 / PY138 = 20/80, and the pigment / polymer ratio (weight ratio) is 52/48. In the same manner as in Example 1, red, green and blue pastes were produced. Subsequently, the red, green, and blue patterns were applied so that the film thicknesses were 2.6 μm, 5.0 μm, and 1.7 μm, respectively, and a color filter was produced in the same manner as in Example 1. However, the green pattern has a large taper due to the thick film thickness, and it is difficult to make a fine pattern. Moreover, the disconnection of ITO resulting from the large level | step difference has arisen in the green pattern part edge part.
[0156]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.320), green (0.257, 0.654), and blue, respectively. (0.142, 0.062), and the color reproduction range was 90.3% compared to the NTSC standard. At that time, the luminance Y of the color filter was 18.2 and the contrast was 420. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 60 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display equivalent to the printed matter, but display defects due to ITO disconnection were found, which was insufficient as a display device.
[0157]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.320) was obtained. ), Green (0.257, 0.654), blue (0.142, 0.062), and the color reproduction range was 90.3% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0158]
Comparative Example 3
The weight composition of the pigment in the red paste is PR254 / PR177 = 20/80, the weight composition of the pigment in the green paste is PG36 / PY17 = 55/45, and the pigment / polymer ratio (weight ratio) is 38/62. In the same manner as in Example 1, red, green and blue pastes were produced. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 2.6 μm, 2.5 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0159]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.675, 0.320), green (0.311, 0.615), and blue, respectively. (0.143, 0.069), and the color reproduction range was 78.5% compared to the NTSC standard. At that time, the luminance Y of the color filter was 24.1 and the contrast was 780. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 75 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. Although the image quality of the obtained liquid crystal display device was bright, it could not be said that the display was equivalent to the printed matter because the green color reproducibility was particularly insufficient. No display defects due to ITO disconnection or the like were found.
[0160]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.675, 0.320) was obtained. ), Green (0.311, 0.615), blue (0.143, 0.069), and the color reproduction range was 78.5% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0161]
Comparative Example 4
Red as in Example 1 except that the weight composition of the pigment in the red paste is PR254 / PR177 = 20/80 and the weight composition of the pigment in the green paste is PG36 / PY138 / PY139 = 50/45/5. Green and blue pastes were made. Subsequently, the red, green and blue patterns were applied so that the film thicknesses were 2.5 μm, 2.6 μm and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1.
[0162]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.317, 0.621), and blue, respectively. (0.143, 0.069), and the color reproduction range was 78.8% compared to the NTSC standard. At that time, the luminance Y of the color filter was 21.3 and the contrast was 850. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 56 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. Although the image quality of the obtained liquid crystal display device was bright, it could not be said that the display was equivalent to the printed matter because the green color reproducibility was particularly insufficient. No display defects due to ITO disconnection or the like were found.
[0163]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.317, 0.621), blue (0.143, 0.069), and the color reproduction range was 78.8% of the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0164]
Comparative Example 5
Red as in Example 1 except that the weight composition of the pigment in the red paste is PR254 / PR177 = 20/80 and the weight composition of the pigment in the green paste is PG36 / PY138 / PY139 = 50/45/5. Green and blue pastes were made. Subsequently, coating was performed so that the film thicknesses of the red, green, and blue patterns were 2.5 μm, 4.2 μm, and 1.5 μm, respectively, and a color filter was produced in the same manner as in Example 1. However, the green pattern has a large taper due to the thick film thickness, and it is difficult to make a fine pattern. Moreover, the disconnection of ITO resulting from the large level | step difference has arisen in the green pattern part edge part.
[0165]
The chromaticity (x, y) when passing through the C light source of the color filter thus obtained is red (0.673, 0.320), green (0.303, 0.654), and blue, respectively. (0.143, 0.069), and the color reproduction range was 85.4% compared to the NTSC standard. At that time, the luminance Y of the color filter was 17.2 and the contrast was 520. The average particle diameter of each color pixel pigment measured from the cross-sectional SEM photograph of the obtained color filter was 50 nm for the red pixel, 56 nm for the green pixel, and 90 nm for the blue pixel.
Using this color filter, a liquid crystal display device was completed in the same manner as in Example 1. The obtained liquid crystal display device was capable of vivid display equivalent to the printed matter, but display defects due to ITO disconnection were found, which was insufficient as a display device.
[0166]
The obtained display device was disassembled and a color filter with an alignment film was taken out, and when this was measured for chromaticity when passing through a C light source in the same manner as described above, red (0.673, 0.320) was obtained. ), Green (0.303, 0.654), blue (0.143, 0.069), and the color reproduction range was 85.4% compared to the NTSC standard, the same results as above. The brightness, contrast, and pigment particle size were the same as above.
[0167]
The results of the above Examples and Comparative Examples are summarized in Table 1, Table 2, and Table 3. According to the present invention, it can be seen that good display is possible when the pixel thickness is 4 μm or less and the NTSC standard ratio is 80% or more.
[0168]
[Table 1]

[0169]
[Table 2]

[0170]
[Table 3]

[0171]
【The invention's effect】
With the color filter of the present invention and the liquid crystal display device using the color filter, it is possible to achieve excellent display having the same vividness as printed matter and free from defects such as ITO disconnection.

Claims (6)

In a color filter having pixels of at least three colors of red, green, and blue, the area of a triangle connecting red, green, and blue chromaticity coordinates in an XYZ color system chromaticity diagram measured using a C light source is , or less NTSC standard ratio 88.7% or more 105.1%, and each pixel thickness 1.5μm or more, I der 3.5 [mu] m or less, as a coloring component of the red pixel, Pigment red 177 and / Alternatively, pigment red 254 is included, and at least one selected from pigment green 7, pigment yellow 17, pigment yellow 150, and pigment yellow 185 is included as a coloring component of a green pixel, and pigment blue 15: 6 is included as a coloring component of a blue pixel. And pigment violet 23 and the average particle size of the pigment contained in the red and green pixels is 100 nm or less. A color filter having an average particle size of the pigment contained in the blue pixel is characterized der Rukoto below 200 nm. Chromaticity coordinates (x, y) in an XYZ color system chromaticity diagram measured using a C light source satisfy the following formulas: 0.662 ≦ x ≦ 0.690 , 0.306 ≦ y ≦ 0.337 The color filter according to claim 1, further comprising a red pixel. Chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram measured using a C light source satisfy the following expressions: 0.201 ≦ x ≦ 0.288 , 0.647 ≦ y ≦ 0.686 The color filter according to claim 1, further comprising a green pixel. Chromaticity coordinates (x, y) in an XYZ color system chromaticity diagram measured using a C light source satisfy the following expressions: 0.141 ≦ x ≦ 0.145 , 0.045 ≦ y ≦ 0.069 The color filter according to claim 1, further comprising a blue pixel. The color filter according to any one of claims 1 to 4, characterized in that it comprises a polyimide resin as a resin component of each pixel. The liquid crystal display device formed by using the color filter according to any of claims 1-5.