CN102681280A - Color-electrophoresis type display media panel - Google Patents
Color-electrophoresis type display media panel Download PDFInfo
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- CN102681280A CN102681280A CN2011100705672A CN201110070567A CN102681280A CN 102681280 A CN102681280 A CN 102681280A CN 2011100705672 A CN2011100705672 A CN 2011100705672A CN 201110070567 A CN201110070567 A CN 201110070567A CN 102681280 A CN102681280 A CN 102681280A
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Abstract
The invention relates to a color-electrophoresis type display media panel which can ensure excellent display luminance and excellent display quality heterogeneity and can improve the narrow viewing angle. The color-electrophoresis type display media panel comprises a transparent substrate, a color filter layer, a transparent electrode layer, a microcapsule layer, an adhesive laye and a back electrode plate which are overlapped in sequence; the microcapsule layer is directly overlapped on the transparent electrode layer; the average particle diameters in arbitrary direction are defined as X and the average particle diameters in the orthogonal direction are defined as Y in the state of observing the particle diameters of the microcapsule in the microcapsule layer from the observation side; the distribution of the microcapsules with the average particle diameters X is as follows: more than 80% of the microcapsules have the average particle diameters of above X1 (X-20mum) and below X2 (X+20mum), less than 20% of the microcapsules have the average particle diameters of below X1 (X-20mum), and less than 5% of the microcapsules have the average particle diameters of above X2 (X+20mum), wherein the X is 35-45mum; and the distribution of the microcapsules with the average particle diameters of Y is the same as that of the microcapsules with average particle diameters of X.
Description
Technical field
The present invention relates to and the incorporate microcapsule-type electrophoretic display panel of color filter; Relate to a kind of color electrophoresis mode display medium panel; This panel constitutes by microcapsule layer being configured in one group of structure between the counter electrode plate, and this microcapsule layer has electrophoresis ink to obtain through in microcapsules, enclosing, and one of them of this group of counter electrode plate is the transparency carrier with color filter layer; Thus, be expected to improve image quality.
Background technology
In recent years, along with the development of information equipment, information shows also have various forms.As the display board of variable information, main flow is CRT (cathode-ray tube (CRT)) and uses liquid crystal backlight.But CRT and the luminescence type displays such as LCD that use backlight are when long-time the use, and the burden of eyes is big, looks tired, and are not suitable for the purposes of long-time continuous reading file etc.
In addition, do not use the LCD of type backlight, have the problem of sense of vision difference owing to use polaroid to cause image obviously darker.In addition, the display image of these displays does not have Memorability, and in the stop supplies electric energy, display image disappears.Even people need the long-time also indefatigability of eyes of seeing thing of using, sense of vision is good, and power consumption is few, and has the display of iconic memory property.
Therefore, as the little reflection display device of the burden of eyes, for example patent documentation 1 disclosed that kind has proposed a kind of electrophoresis-type display board, and this display board has a pair of counter electrode and is arranged on this interelectrode electrophoresis-type display layer.The paper of this electrophoresis-type display board and printing likewise passes through reflected light display text or image, thus few to the burden of eyes, be fit to continue for a long time to watch the operation of picture.
This electrophoresis-type display board is based on that principle carries out: on the dispersion liquid of dispersed charged particles, applies voltage and changes electric field, charged particle is moved, and can display image.In the electrophoresis-type display board, painted charged particle is enclosed microcapsules, microcapsules are configured between a pair of counter electrode, thereby the microcapsule-type electrophoresis-type display board that forms has advantages such as driving voltage is low, high-flexibility, can by practical, further developed.
Except the display of carry-on information equipments such as so-called PDA (portable information terminal) or e-book; Can be what further popularize from now on: show conversion to display with printed matter such as newspaper or book, magazine, placard and from the hard copy that printer etc. outputs on the paper; At this moment, be suitable for this electrophoresis-type panel.This electrophoresis-type panel generally is to be shown as main two looks demonstration to deceive in vain on the structure, in order to show above-mentioned magazine or chromatograp, requires multicolourization in recent years.
In order to make this electrophoresis-type panel multicolor; Disclose and used two or more multiple colour electrophoretic particles; For example be to form pattern in patent documentation 2 through photolithography; In patent documentation 3, except photolithography, also use ink-jet method, electrophoresis particle is configured in the technology in the predetermined pixel.In addition, in patent documentation 4, disclose a kind of display board, this display board is arranged on a plurality of microcapsules on the desirable position through being pre-formed the box framework of taking in microcapsules exactly, thereby can multiple color show.But, the method that the microcapsules of multiple color are configured in the predetermined pixel to be compared with common photoresist etc., practical situation is that operation is many, complicated, technical difficulty is many.
Therefore, in patent documentation 5, delivered through colour filtering chip basic board being fitted on the black and white electrophoresis-type display board, thus make do not need between microcapsules and pixel positional precision can multicolor displaying mode.But; This mode is because the colour filtering chip basic board of fitting and making in addition on as the black and white electrophoresis-type display board of reflection-type display board; So must insert the bonding coat of applying usefulness in the centre; So its display brightness is low, in addition because the applying of colour filtering chip basic board difficulty also has the low such problem of productivity.In addition, owing to have distance between colour filter and electrophoresis laminar display layer, so because the different colorific vision differences of viewing angle have caused losing the advantage that no viewing angle influences such Electronic Paper.
Therefore, inventor of the present invention finds to seek to improve display brightness and visual angle through direct range upon range of microcapsules printing ink on the transparent electrode layer of color filter.But as previously mentioned, this electrophoresis-type display board is because through reflected light display text or image, twice dyed layer through color filter of light becomes major issue so improve reflectivity.That is, importantly improve and disperseed in the microcapsule layer of microcapsules, the ratio of the microcapsules that help to show.
[prior art document]
[patent documentation]
The special public clear 50-015115 communique of [patent documentation 1] Japan
[patent documentation 2] TOHKEMY 2002-365668 communique
[patent documentation 3] TOHKEMY 2003-156770 communique
[patent documentation 4] TOHKEMY 2003-295234 communique
[patent documentation 5] TOHKEMY 2003-161964 communique
Summary of the invention
The present invention proposes according to the problems referred to above; Problem is to provide a kind of display medium panel of color electrophoresis mode; This panel is in the display medium panel of the microcapsule-type electrophoresis mode of multicolor displaying; Display brightness is excellent, has improved the problem of visual angle stricturization, and the display quality homogenieity is also excellent.
Inventor of the present invention carries out conscientious research to the problems referred to above; Thereby find to seek to improve display brightness and visual angle, in addition through direct range upon range of microcapsules printing ink on the transparent electrode layer of watching on the color filter layer that is provided with on the transparency carrier of side; The size distribution of the microcapsules through the microcapsule layer that regulate to form is a certain limit; Can obtain that the white reflection rate is high, density unevenness is few, thereby be expected to improve the multicolor displaying plate of image quality, and then accomplish the present invention.
Promptly; Invention according to technical scheme 1 of the present invention is a kind of display medium panel of color electrophoresis mode; This panel is that aforementioned microcapsule layer directly is layered on the aforementioned transparent electrode layer with the multicolor displaying plate of the sequential cascade formation of transparency carrier, color filter layer, transparent electrode layer, microcapsule layer, adhesive phase, backplate plate, and aforementioned microcapsule layer is distributed to microcapsules and constitutes in the resin glue; Aforementioned microcapsules have been enclosed the dispersion liquid that in transparent dispersion medium, disperses electrophoresis particle and obtain; Through applying the reflectivity properties that electric field that voltage produces changes optics, aforementioned backplate plate is a configuration pixel electrode and the battery lead plate that forms is characterized in that on base material; From watching side to observe under the state of particle diameter of the microcapsules the aforementioned microcapsule layer; The mean grain size of direction arbitrarily is defined as X, in the time of will being defined as Y with the mean grain size of the direction of its quadrature, has following distribution.
Mean grain size is in X=35～45 μ m, at particle diameter X
1(X-20 μ m) above and particle diameter X
2The ratio quantity of the microcapsules below (X+20 μ m) occupies more than 80%, and not enough particle diameter X
1The microcapsules lazy weight 20% of (X-20 μ m) surpasses particle diameter X
2The microcapsules lazy weight 5% of (X+20 μ m).
In addition, mean grain size is in Y=35～45 μ m, at particle diameter Y
1(Y-20 μ m) above and particle diameter Y
2The ratio quantity of the microcapsules below (Y+20 μ m) occupies more than 80%, and not enough particle diameter Y
1The microcapsules lazy weight 20% of (Y-20 μ m) surpasses particle diameter Y
2The microcapsules lazy weight 5% of (Y+20 μ m).
In addition; The invention of technical scheme 2 of the present invention is display medium panels of the color electrophoresis mode put down in writing according to technical scheme 1, it is characterized in that aforementioned electrophoresis particle is the particle with two kinds of different surfaces electric charges; Wherein a kind of is colored particles, and another kind is a white particles.
In addition; The invention of technical scheme 3 of the present invention is display medium panels of the color electrophoresis mode put down in writing according to technical scheme 1; It is characterized in that, the thickness of aforementioned color filter layer in the scope of 0.5～2.0 μ m, between the pixel in the display frame with pixel in differential (film thickness difference) be in the 0.3 μ m; Do not have overlappingly between each pixel of adjacency, and the top of each pixel is left in the pixel boundary 5.0 μ m.
Then; The invention of technical scheme 4 of the present invention is display medium panels of the color electrophoresis mode put down in writing according to technical scheme 1; It is characterized in that; Observing from the profile direction of display board under the state of aforementioned microcapsule layer, the thickness of aforementioned microcapsule layer is with aforementioned mean grain size X or aforementioned mean grain size Y is equal or thickness below it, and be 0.8X
1Or 0.8Y
1Above thickness.
In the display medium panel of microcapsule-type electrophoresis mode, through on the surface of a large amount of driving fit microcapsules of transparent electrode layer side of watching side, reflecting surface just, thus make brightness, image quality better.In the display medium panel of color electrophoresis mode of the present invention; Through on the transparent electrode layer that is had on the high color filter layer of flatness, directly forming microcapsule layer; The coating of microcapsules easy and uniform ground; And very closely dispose the multicolor displaying plate that the quality that can obtain drawing a portrait improves as the microcapsule layer of display surface and the distance of color filter layer.In addition, obtain the multicolor displaying plate that the color depth inequality tails off, this color depth inequality is because in reflection-type, the light secondary causes through the film thickness difference by color filter layer that produces.
In addition, in the display medium panel of color electrophoresis mode of the present invention, form the size-grade distribution of above-mentioned particular range, can obtain good, the uneven few coated film of coating adaptability of microcapsules printing ink through the particle diameter that makes the microcapsules in the microcapsule layer.In addition; Through state that in resin glue, suspends or the multimode that is deposited on the adhesive phase side, the situation of leaving distance with transparent electrode layer is few, and the transparent electrode layer side of side is being watched in the reflecting surface driving fit of most microcapsules; So it is consistent with the flatness of above-mentioned color filter; In display frame He in each pixel, do not have inequality, improve display brightness, can obtain excellent Show Color with high reflectivity.
In addition, in the display medium panel of color electrophoresis mode of the present invention, the thickness of microcapsule layer is equal or below it with mean grain size X or mean grain size Y, and is 0.8X
1Or 0.8Y
1More than.Just; Big microcapsules are crushed with to a certain degree on thickness direction; When being the state of driving fit, there is not overlapping, interference between the little microcapsules between the microcapsules of adjacency, and because the displacement of electrophoresis particle is even; So driving, responsiveness to the electric field change that produces by applying voltage are also excellent, have improved display performance.
In addition; The existing display board that forms with fitting the other colour filtering chip basic board of making is compared; In structure of the present invention; Between microcapsule layer and color filter layer, do not have unnecessary layers such as bonding agent, the reflected light that is reflected by microcapsule layer passes through MIN layer, and display brightness is higher than aforementioned existing display board.In addition; Distance about owing to color filter layer and microcapsule layer is separated and the demonstration of observed microcapsule layer and the misalignment of color filter; Also be through making microcapsules, thereby do not observe aforementioned this sight equation, do not cause the narrow of visual angle near color filter layer.
Description of drawings
Fig. 1: the structure diagram of an embodiment of the display medium panel through cross sectional illustration color electrophoresis mode of the present invention.
Fig. 2: the tactic pattern figure of an embodiment of the display medium panel through the cross sectional illustration color electrophoresis mode of the present invention of amplifying.
Fig. 3 (a) and Fig. 3 (b): the size-grade distribution key diagram of the particle diameter of the microcapsules in the microcapsule layer of the present invention.
Fig. 4: the mode chart of amplification profile of an example of color filter that constitutes the display medium panel of color electrophoresis mode of the present invention.
Fig. 5 (a) and Fig. 5 (b): the amplification plane key diagram of an embodiment of color filter that constitutes the display medium panel of color electrophoresis mode of the present invention.
Embodiment
To the display medium panel of color electrophoresis mode of the present invention, specify as follows based on an one of which embodiment.
Fig. 1 is the sketch through the structure example of the display medium panel of the color electrophoresis mode of cross sectional illustration one embodiment of the invention, and Fig. 2 is the mode chart that the section through its amplification describes.As depicted in figs. 1 and 2; The display medium panel of color electrophoresis mode of the present invention is the display board with the sequential cascade formation of transparency carrier 1, color filter layer 2, transparent electrode layer 4, microcapsule layer 10, adhesive phase 16, backplate plate 40; Microcapsule layer 10 directly is layered on the transparent electrode layer 4; Microcapsule layer 10 is distributed to microcapsules 5 in the resin glue 11 and forms; Microcapsules 5 have been enclosed dispersion liquid, and this dispersion liquid electrophoresis particle of dispersion staining particle 6 and white particles 7 in transparent dispersion medium 8 obtains, and these microcapsules change through the electric field that applies voltage and produce; Change the reflectivity properties of optics, backplate plate 40 is to dispose pixel electrode 30 formations on the base material 50 overleaf.
In addition, though diagram not as required, can be provided for reducing the surface smoothing layer that has been coated with resin glue outside concavo-convex of microcapsules 5 on microcapsule layer 10.
As transparency carrier 1, can use resin plate, film or the sheet of glass plate such as soda-lime glass, low alkali borosilicate glass, alkali-free alumina borosilicate glass and polyethylene terephthalate (PET) and polycarbonate, polyimide, PEN, polyethersulfone, acryl resin, PVC etc.
In the display medium panel of color electrophoresis mode of the present invention; The planar graph shape of color filter layer 2 does not have special qualification; Can suitably use suitable shape; For example the parallel or cross-over configuration ground formation with the filter section (filter segment) of fine band (striped) shape constitutes to perhaps that fine filter section is certain in length and breadth array configurations.For example, be not limited to the dot structure that RGBW has been made up in a large amount of uses shown in Fig. 5 (a) and Fig. 5 (b).In the color filter layer 2 that uses among the present invention a plurality of colored patterns are set, image-region disposes colored pixels respectively.Colored pixels is on each pixel that transmitted light is painted, and general assortment is equivalent to the trichromatic redness (R) of light, green (G), blue (B) these three kinds of colors, the perhaps colored pixels of 3 primary colors of yellow (Y), pinkish red (M), cyan (C).In addition, here, W is the middle transparent resins that use such as light clapboard; In order to utilize more multiple reflection light, raising brightness; With colored pixels combined usefulness, in the color filter layer of the display medium panel that constitutes color electrophoresis mode of the present invention, do not use common black matrix (black matrix).
In the display medium panel of color electrophoresis mode of the present invention, the section shape of color filter layer 2 is as shown in Figure 4, shows that according to the coating adaptability of microcapsules printing ink and image property adjustments is certain shape.The thickness of color filter layer is 0.5～2.0 μ m, be preferably the scope of 0.7～1.3 μ m.In multicolor displaying plate of the present invention, because light passes through color filter layer twice, so, use the pigmentary resin of the color property higher than the transmitance of infiltration type in order to ensure brightness.When thickness less than 0.5 μ m, can't balancedly select necessary colour saturation and to the cohesive of transparency carrier.In addition, when thickness surpasses 2.0 μ m, has the problem of middle Thickness Variation such as can't suppressing to develop.
Between the pixel in the display frame with pixel in differential (film thickness difference) be 0.3 μ m with interior, be preferably 0.1 μ m.If the differential 0.3 μ m that surpasses between pixel, then confirming has color depth poor, perhaps on the coated film of microcapsules printing ink, produces the inhomogeneous of appearance that rise and fall, and possibly influence image and show.This film thickness difference can be through the controls such as composition, conditions of exposure and development conditions of resist printing ink.
In addition, use LCD panel backlight with color filter in, in order to improve contrast, avoid colour mixture, use black matrix (BM) between each pattern of pixels, in addition, when not using BM,, also make between the pixel adjacent overlapping for fear of light leak.Therefore, the bead of pixel, when it highly surpassed 0.3 μ m, microcapsules printing ink produced deviation, influenced the homogeneity of coated face.Therefore, as far as color filter of the present invention, not overlapping between the pixel.As shown in Figure 4; The final final section shape of each pixel is generally trapezoidal, is through bottom margin contact or the state that departs from slightly and not overlapping between each pixel of adjacency, and; It is in the 5.0 μ m that the top of each trapezoidal pixel is left pixel boundary, is preferably in the 3.5 μ m.Through forming this section shape; Can form following such display board: pixel does not have projection, microcapsules printing ink not to have the coating of secund ground; Can suppress simultaneously to see the uneven generation of the tortuous image in surface, and catoptrical utilization ratio is good, brightness is high.
General following the carrying out of the manufacturing of this color filter layer: will on photoresist, disperse to sneak into the coloring phototonus resin of colorants formation such as pigment or dyestuff or transparent photoresist, through spin-coating method or irrotationality rubbing method, coating is homogeneous thickness on glass substrate; After drying is removed remaining solvent, through photolithography, to the photomask of this etchant resist through institute's desirable shape; Through proximity exposure (near exposure) etc.; Use extra-high-pressure mercury vapour lamp irradiation active energy ray, solidify (minus) or improve alkali solubility (eurymeric), remove part with dissolvings such as aqueous slkalis; Develop thus, after cure, repeat this operation of necessary amount.In addition, in the present invention, be not to be defined as above-mentioned manufacturing approach especially.
Then, on the color filter layer 2 as required with surface grinding, leveling after, transparent electrode layer 4 is set.The material that can be used as transparent electrode material and use for example is the such electroconductive oxide with transparency of indium oxide system such as ITO, Sn system, Zinc oxide etc.This transparency electrode can use prior aries such as vapour deposition method, sputtering method, CVD method to form.
Below, the displaying principle of color filter of band microcapsules is carried out summary description, the color filter of these band microcapsules constitutes the display medium panel of color electrophoresis mode of the present invention.
As shown in Figure 2, pixel electrode on the back side base material 50 30 connects the on-off element (not shown) of each pixel electrodes, can between itself and transparent electrode layer 4, apply positive and negative voltage.For display image, usually, pixel electrode 30 connects the power supply of the circuit structure of active array type type of drive.If on pixel electrode 30, apply voltage, then be applied to the electric field change on the microcapsule layer 10.When pixel electrode 30 was positive pole, the electronegative particle in the microcapsules 5 was toward pixel electrode 30 side shiftings at the back side, and the particle of positively charged moves to transparent electrode layer 4 sides of front.Likewise, if pixel electrode 30 is a negative pole, then the particle of positively charged moves to the pixel electrode side, and electronegative particle is toward transparent electrode layer 4 side shiftings.Here; For example suppose the black particles positively charged; White particles is electronegative, and then Show Color is the color of the particle of transparent electrode layer 4 side shiftings forward, reflects above that from the light of observing side; Reflected light can be with color ground to show desirable literal or image through the colored pattern of the color filter layer of subtend.
Then, further specify the employed material of display medium panel, the parts of color electrophoresis mode of the present invention.
The microcapsules 5 that the color filter of band microcapsules uses when forming are made up of colored particles 6, white particles 7, transparent dispersion medium 8 and microcapsule shell 9.
In general; The microcapsules that use in the microcapsule-type electrophoresis-type display board are refining through sieve method or density separation etc., and mean grain size is 30～100 μ m, in addition; With respect to the mean grain size of capsule, 10 μ m surpass 50% at least with the ratio of the microcapsules of interior particle diameter before and after having.
In the display medium panel of electrophoresis mode of the present invention; Shown in Fig. 3 (a); From watching side to observe under the state of particle diameter of the microcapsules the microcapsule layer, the mean grain size 1 of any direction is defined as X, in the time of will being defined as Y with the mean grain size 2 of the direction of its quadrature; Shown in 1 example of the represented this state of Fig. 3 (b), process and have following size-grade distribution.Just, mean grain size is in X=35～45 μ m, particle diameter X
1More than (X-20 μ m)～particle diameter X
2The ratio quantity of the microcapsules below (X+20 μ m) occupies more than 80%, and not enough particle diameter X
1The lazy weight 20% of the microcapsules of (X-20 μ m) surpasses particle diameter X
2The lazy weight 5% of the microcapsules of (X+20 μ m).In addition, mean grain size is in Y=35～45 μ m, particle diameter Y
1More than (Y-20 μ m)～particle diameter Y
2The ratio quantity of the microcapsules below (Y+20 μ m) occupies more than 80%, and not enough particle diameter Y
1The lazy weight 20% of the microcapsules of (Y-20 μ m) surpasses particle diameter Y
2The lazy weight 3% of the microcapsules of (Y+20 μ m).Above-mentioned size-grade distribution is from watching side to observe the state of panel, and the microcapsules from the microcapsule layer that transverse direction is seen are on above-below direction, form the ellipse of compressive strain slightly.
Micro-capsule dispersion liquid uses water solvents such as alcohol, if there is not special problem, makes water.
As dispersion medium 8 from can make charged particle well, charged insulativity liquid stably, select in the just water-fast basically organic solvent.For example can enumerate out long-chain alcohol series solvents such as dodecanol, hendecanol; Many carbon such as dibutyl ketone, methyl isobutyl ketone ketone; Aliphatic hydrocarbons such as pentane, hexane, octane; Alicyclic hydrocarbon such as cyclohexane, methylcyclohexane; Benzene,toluene,xylene, hexyl benzene, butyl benzene, octyl group benzene, nonyl benzene, decyl benzene, undecyl benzene, dodecyl benzene, tridane, myristyl benzene etc. have the aromatic hydrocarbons such as benzene class of chain alkyl, methylene chloride, chloroform, phenixin, 1, halogenated hydrocarbons and silicone oil, any single component of the various oils of olive wet goods or their potpourris such as 2-ethylene dichloride.
In the black electrophoretic particles as colored particles 6,, can also use the micropowder of glass or resin etc. and their complex etc. except nigrosine, carbon black etc. the black pigment.In addition, in the multicolor displaying plate of the present invention that carries out multicolor displaying through color filter, use the black particles of carbon black usually.In addition, use white inorganic pigments such as known titanium dioxide, silicon dioxide, aluminium oxide, zinc paste as the white electrophoretic particles of white particles 7, organic compound such as vinyl acetate emulsion fluid and their complex etc.
In addition; Colored particles 6 and white particles 7 as required can be through using various surfactants, spreading agent, organic and surface that mineral compound, metal etc. are handled particles; Not only desirable surface charge can be given, and the dispersion stabilization in the transparent dispersion medium 8 can be improved.
The dispersion liquid A that colored particles 6 and white particles 7 are distributed in the transparent dispersion medium 8 uses known method such as phase separation methods such as mixing coacervation, surface aggregate method, in-situ polymerization (in-situ) method, dissolving dispersion cooling method to enclose in the microcapsules.The shell 9 of microcapsules for example is that rubber or gelatin etc. have elasticity and can adapt to the flexible film that has of necessary distortion.As the material that forms microcapsules; The preferred material that fully sees through light; Particularly, can enumerate out urea-formaldehyde resin, melamine formaldehyde resin, vibrin, urethane resin, polyvinyl resin, polystyrene resin, polyamide, acrylate resin, methacrylate resin, vinyl acetate resin, rubber, gelatin etc.They can separately or mix two or more uses.
Disperse to have regulated in the micro-capsule dispersion liquid of microcapsules of size distribution, mix thickening agent, surfactant and resin glue 11 etc., allotment microcapsules printing ink.In the resin glue 11 of microcapsules printing ink, use dielectric resins such as PLA, phenolics, acrylic resin, acryl resin, urethane resin.
Microcapsule layer 10 forms the direct coating on the transparent electrode layer 4 of the transparency carrier 1 that is formed by glass substrate or resin substrate that is provided with color filter layer 2, transparent electrode layer 4 in advance of aforementioned microcapsules printing ink as previously mentioned.Coating uses apparatus for coating such as screen printing mode, nick version spreader, touch roll coating machine, comma spreader, slit type coater, excellent spreader, curtain formula spreader to carry out, and in the present invention, can preferably use the slit die coating machine.
Surface smoothing carburetion China ink is in solvent, to disperse to form as the resin of cementing agent.As the cementing agent composition be preferably with microcapsules printing ink in the identical resin of cementing agent composition specific inductive capacity that uses in the resin glue composition that uses or the adhesive phase.Particularly, most preferably with microcapsules printing ink, adhesive phase in the resin glue composition that uses identical, and also identical with the resin glue composition of surface smoothing carburetion China ink.If use the different resin of specific inductive capacity, the then different resin of range upon range of specific inductive capacity between electrode, and the thickness of each resin forms different state according to the size at the microcapsules that this part had.So because the difference of the specific inductive capacity of each resin, being applied to voltage on the microcapsules, to be difficult at whole picture areas be uniform.
Solvent as surface smoothing carburetion China ink can use those that use in the microcapsules printing ink, also can use aqueous solvents such as other alcohol.Apparatus for coating coatings such as curtain formula spreader, slit die coating machine are used in the coating of surface smoothing carburetion China ink.The coating method of cut-out coating fluids such as scraper coating is owing to the microcapsules rupture that makes in the microcapsule layer, so can not use.
The thickness of surface smoothing layer is preferably 10～30 μ m.When 10 μ m are following, the uneven cunning of surface of microcapsule.On the other hand, when 30 μ m were above, interelectrode distance was wide, became the reason that driving voltage raises.
As above form the surface smoothing layer, solvent is fully evaporated, thereby form the color filter of band microcapsules.Through adhesive layer being located in the color filter of these band microcapsules and overleaf between the backplate plate of base material configuration pixel electrode; Make the colored pattern (pixel) of color filter and the pixel electrode position of backplate overlap the ground applying; Carry out range upon range of, thereby accomplish the display medium panel of color electrophoresis mode of the present invention.
Can be used as material that cementing agent uses, to be preferably synthetic resin such as polyurethane series cementing agent, acrylic resin cementing agent be cementing agent.The preferred especially cementing agent that uses high dielectric resin.
Cementing agent can also be coated directly onto on above-mentioned microcapsule layer or the pixel electrode; In manufacturing approach of the present invention; The resin that preferably between silicon fiml and resin substrate, forms conductive layer is peeled off on the substrate; Coating used with aforementioned microcapsules printing ink in the resin glue that uses with the bonding agent of sample ingredient, form adhesive sheet and use.Through use and microcapsules printing ink in the resin glue that uses with the bonding agent of sample ingredient; Can enumerate following advantage: the compatibility that improves resin boundary surface; Be difficult to produce and peel off, and because specific inductive capacity is similar, so the voltage that is applied on the microcapsules is certain in face easily.
In addition; Peel off substrate through using the resin that between silicon fiml and resin substrate, forms conductive layer; Can form multilager base plate at the above-mentioned adhesive sheet of color filter laminated of being with microcapsules, promptly the front panel of color filter electrophoresis showed mode drives evaluation, quality is confirmed.In addition, the conductive layer here is not owing to needing the transparency, so can be that vapor deposition, electro-deposition form the film of metals such as copper, aluminium and the film that coating forms electric conductive polymer.
[embodiment]
Below, specific embodiment of the present invention is described.
< embodiment 1 >
To use titanium dioxide powder (white particles) and the hydrocarbon black powder (black particles) through alkyl trimethylammonium chloride surface-treated mean grain size 4 μ m of the mean grain size 3 μ m of polyvinyl resin covering surfaces in transparent dispersion medium zellon, to disperse, obtain dispersion liquid A.In this case, white particles is electronegative, the black particles positively charged.
Then, dissolving gelatin and kayexalate in water, the preparation WS and dispersion liquid A mix, the liquid temperature is adjusted to 40 ℃ after, keep liquid temperature on one side, Yi Bian pass through the homogenizer stirring, obtain O/W emulsion fluid.
Then; With the O/W emulsion fluid that obtains and the WS that in water, dissolved gum arabic; Use decollator to mix down at 40 ℃, on one side the liquid temperature is maintained 40 ℃, acetic acid used on one side; With the pH regulator of solution is 4, and forming with the gelatin-Arabic gum through complex coacervation is the microcapsules of shell material.
Then, the liquid temperature is reduced to 5 ℃ after, add 37 quality % formalin solutions, the wall material of microcapsule shell is solidified, obtained enclosing the microcapsules of the dispersion liquid A of dispersion white particles (Titanium particles) and black particles (carbon black particle).
The microcapsules that screening obtains like this; Make size consistent; So that mean grain size is in 40 μ m; From being 80% to the ratio quantity below the particle diameter 60 μ m more than the particle diameter 20 μ m, the ratio less than 5% of the microcapsules of the particle diameter that ratio less than 20%, the 60 μ m of the microcapsules of the particle diameter of less than 20 μ m is above.
Then, the microcapsules consistent with above-mentioned size are solid constituent, regulate the aqueous dispersions of the microcapsules of solid constituent 40 quality %.Polyurethane series cementing agent (CP-7050, Dainippon Ink Chemicals make), surfactant, thickening agent and the pure water of this aqueous dispersions, solid constituent 25 quality % are mixed, make microcapsules printing ink.
On the other hand, make color filter through following method.Part described here all is a mass parts.At first, be solvent with the cyclohexanone, make 50 parts of butyl methacrylates, 20 parts of methyl methacrylates, 30 parts of acrylic acid copolymers, make acryl resin.
To 25 parts of this acryl resins, be 47 parts ratio with solvent, make acrylic resin soln, mix 20 parts of red pigments (Pigment Red 22) therein, disperseed 1 hour through the pearl mill.Afterwards, mix 4 parts of dipentaerythritols as photo-sensitive monomer, 4 part of six acrylic ester and, prepare red photo-induced corrosion resistant material through decollator again as 0.3 part of two (2,4, the 6-trimethylbenzoyl)-phenylphosphine oxide of Photoepolymerizationinitiater initiater.
Should the redness photo-induced corrosion resistant material be spun on the transparent glass substrate of vertical 400mm * horizontal 320mm, thickness 0.7mm, placed at normal temperatures 5 minutes, make the film surface smoothing after, 70 ℃ dry 20 minutes down, form red photoresist layer.
Then; On this redness photoresist layer, shown in Fig. 5 (b), form the 6 type display boards that 6 display frames are vertical 97.28mm * horizontal 128.08mm; Shown in Fig. 5 (a), will be 151 μ m * 153 μ m corresponding to sub-pixel size, the Pixel Dimensions that is made up of RGB W is the photomask of the pixel of the 302 μ m * 306 μ m pattern that repeats in length and breadth to obtain, is arranged on the position of red exposure; Through extra-high-pressure mercury vapour lamp, with exposure 150mJ/cm
2Condition driving fit exposure.After the exposure, with ejection pressure 1Kg/cm
2Spray 1% aqueous sodium carbonate of 20 ℃ of vaporific temperature, carry out 20 second spray development, remove unexposed position, expose glass substrate.After the glass substrate drying after the development treatment, heated 1 hour down at 230 ℃, carry out solid film thus and handle, obtain the red pattern of thickness 1.1 μ m.
Then, on the glass substrate that forms this red pattern, use viridine green (Pigment Green7) equally to make green photo-induced corrosion resistant material with forming, use this material to form green photoresist layer as color material and aforementioned red photoresist.Then, will move on the position that is arranged on the green pattern of formation, with aforementioned same photomask with exposure 200mJ/cm
2Condition driving fit exposure.After the exposure, with ejection pressure 1Kg/cm
2Spray 1% aqueous sodium carbonate of 20 ℃ of vaporific temperature, carry out 30 second spray development, remove unexposed position, expose glass substrate.With after the glass substrate drying after the development treatment and likewise aforementioned, 230 ℃ of heating 1 hour down, carry out solid film and handle, obtain the green pattern of thickness 1.2 μ m.
Then and likewise aforementioned, use blue pigment (Pigment Blue 15:6), use blue photo-induced corrosion resistant material to form blue photoresist layer as color material.Then, will move on the position that is arranged on the blue pattern of formation with aforementioned same photomask, the driving fit exposure is developed, and removes unexposed position, exposes glass substrate.With after the glass substrate drying after the development treatment and likewise aforementioned, 230 ℃ of heating 1 hour down, carry out solid film and handle, obtain the blue pattern of thickness 1.1 μ m.
Then, use the photonasty acryl resin of only having removed coloring pigment, carry out and above-mentioned same operation, obtain W (transparent) pattern of thickness 1.1 μ m.Each subpixels of RGBW is that film thickness difference is 0.1 μ m to the maximum, does not have overlappingly between each pixel of adjacency, and forms with the form of bottom margin contact, and is even under the situation of separating, maximum separately below the 1.0 μ m.In addition, top all is to leave in the pixel boundary 3.5 μ m.
Like this; Obtain following substrate: on glass substrate, form the 6 profile plates of 6 display frames for vertical 97.28mm * horizontal 128.08mm, forming the pixel size that has sub-pixel size 151 μ m * 153 μ m, is made up of RGBW is the color filter layer of the pattern of 302 μ m * 306 μ m.Then, do not carry out milled processed and be coated with outward, on this color filter layer and the glass substrate that exposes whole, form the transparent electrode layer that forms by ITO of thickness 150nm through sputtering method.
Then, use the slit die coating machine, aforementioned microcapsules printing ink is coated directly onto on the transparent electrode layer on the transparent glass substrate that forms aforementioned color filter layer.Coating is that the thickness that forms microcapsule layer through extrusion die is 40 μ m, does not overlap between the microcapsules, and the microcapsules that particle diameter is big are pressed into that the state of microcapsule layer carries out.After the coating, drying is 10 minutes under 60 ℃, obtains the color filter with microcapsules.
Then; On the microcapsule layer of the color filter of above-mentioned band microcapsules; Use the slit die coating machine, the polyurethane series cementing agent of overlapping applying solid composition 25 quality % (CP-7050, Dainippon Ink Chemicals makes) is used printing ink as surface smoothingization; Carry out drying, obtain the thick band microcapsules color filter that has the surface smoothing layer of 10 μ m.
In addition; On the one side of polyethylene terephthalate sheet as the thick aluminium of conductive layer vapor deposition 100nm; Then, being provided with silicon above that is release coating, in the release-coated face side of the thick polyethylene terephthalate sheet of the 50 μ m that obtain; Being coated with the thick polyester-polyurethane of 25 μ m is bonding agent, the modulating adhesive sheet.
Then, on the color filter of the band microcapsules of above-mentioned belt surface smooth layer, the above-mentioned bonding sheet of fitting obtains having the color filter electrophoresis showed mode front panel of 66 type display frames.Under this state, apply voltage at transparent electrode layer and conductive layer, carry out the driving of microcapsule layer and confirm.
Then; To this color filter electrophoresis showed mode front panel, staying polyester-polyurethane is the adhesive phase of bonding agent, peels off to be provided with the thick polyethylene terephthalate sheet of 50 μ m that silicon is release coating; On the telltale mark of color filter, overlap; At the pixel electrode face that has 6 backplate plate, fit with the pressure of 0.50MP, then corresponding to 6 types of color filter; With 6 display frames respectively in flakes; Obtain the display medium panel of color electrophoresis mode of the present invention, this backplate plate has the pixel electrode that is made up of ITO on the glass substrate as the TFT substrate, and this ITO is the ITO of the circuit structure of the active array type type of drive of use thin film transistor (TFT) formation.
On each display board of the embodiment 1 that makes, by normal voltage electric current-producing device (Yokogawa Motor (Co., Ltd.) manufacturing), apply the voltage of pact ± 15V between the transparency electrode in front and the pixel electrode at the back side, estimate actual displayed character.In addition, use color colour difference meter CR-400 (コ ニ カ ミ ノ Le タ manufactured), the reflectivity evaluation contrast the when reflectivity when (when white shows) is with black display when measuring colored demonstration the, when white () reflectivity during with contrast=colour/black.In addition, measure visual brightness L through same apparatus
*
The result is, the display board of embodiment 1 be the white reflection rate of 6 display boards up to 23%, brightness is high, can through with the contrast of monochromatic equal 12: 1 excellence than realizing multicolor displaying.Color depth between uneven and 6 panels of the image that do not detect the crawling of microcapsules printing ink and cause is different.In addition, any display board does not all have color uneven when positive and transverse observation, can also improve the color parallax that visual angle causes, can excellent ground Show Color as Electronic Paper.
Claims (4)
1. the display medium panel of a color electrophoresis mode, this panel are the multicolor displaying plates that the sequential cascade with transparency carrier, color filter layer, transparent electrode layer, microcapsule layer, adhesive phase, backplate plate constitutes,
Aforementioned microcapsule layer directly is layered on the aforementioned transparent electrode layer,
Aforementioned microcapsule layer is distributed to microcapsules in the resin glue and constitutes,
Aforementioned microcapsules have been enclosed in transparent dispersion medium the dispersion liquid that disperses electrophoresis particle and obtain, through applying the reflectivity properties that electric field that voltage produces changes optics,
Aforementioned backplate plate is configuration pixel electrode and the battery lead plate that forms on base material,
It is characterized in that, from watching side to observe under the state of particle diameter of the microcapsules the aforementioned microcapsule layer, the mean grain size of direction arbitrarily is defined as X, in the time of will being defined as Y with the mean grain size of the direction of its quadrature, has following distribution,
Mean grain size is in X=35～45 μ m, at particle diameter X
1(X-20 μ m) above and particle diameter X
2The ratio quantity of the microcapsules below (X+20 μ m) occupies more than 80%, and not enough particle diameter X
1The microcapsules lazy weight 20% of (X-20 μ m) surpasses particle diameter X
2The microcapsules lazy weight 5% of (X+20 μ m),
In addition, mean grain size is in Y=35～45 μ m, particle diameter Y
1(Y-20 μ m) above and particle diameter Y
2The ratio quantity of the microcapsules below (Y+20 μ m) occupies more than 80%, and not enough particle diameter Y
1The microcapsules lazy weight 20% of (Y-20 μ m) surpasses particle diameter Y
2The microcapsules lazy weight 5% of (Y+20 μ m).
2. the display medium panel of the color electrophoresis mode of putting down in writing according to claim 1 is characterized in that aforementioned electrophoresis particle is the particle with two kinds of different surfaces electric charges, and wherein a kind of is colored particles, and another kind is a white particles.
3. the display medium panel of the color electrophoresis mode of putting down in writing according to claim 1; It is characterized in that; The thickness of aforementioned color filter layer is in the scope of 0.5～2.0 μ m; Between the pixel in the display frame with pixel in differential (film thickness difference) be in the 0.3 μ m, do not have overlappingly between each pixel of adjacency, and the top of each trapezoidal pixel is left in the pixel boundary 5.0 μ m.
4. the display medium panel of the color electrophoresis mode of putting down in writing according to claim 1; It is characterized in that; Observing from the profile direction of display board under the state of aforementioned microcapsule layer; The thickness of aforementioned microcapsule layer is with aforementioned mean grain size X or aforementioned mean grain size Y is equal or thickness below it, and be 0.8X
1Or 0.8Y
1Above thickness.
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| CN2011100705672A CN102681280A (en) | 2011-03-17 | 2011-03-17 | Color-electrophoresis type display media panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091926A (en) * | 2013-02-06 | 2013-05-08 | 广州奥翼电子科技有限公司 | Electrophoresis display assembly, electrophoresis displayer and preparation method of the same |
| CN107632480A (en) * | 2017-09-25 | 2018-01-26 | 京东方科技集团股份有限公司 | Display panel and preparation method thereof, control method |
| CN108279543A (en) * | 2018-02-26 | 2018-07-13 | 广州奥翼电子科技股份有限公司 | Electrophoresis showed diaphragm, electrophoretic display device (EPD) and electrophoretic display coating fluid |
| TWI752565B (en) * | 2017-06-16 | 2022-01-11 | 美商電子墨水股份有限公司 | Electro-optic medium and method of forming an electro-optic medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103091926A (en) * | 2013-02-06 | 2013-05-08 | 广州奥翼电子科技有限公司 | Electrophoresis display assembly, electrophoresis displayer and preparation method of the same |
| CN103091926B (en) * | 2013-02-06 | 2019-01-25 | 广州奥翼电子科技股份有限公司 | Electrophoresis showed component, electrophoretic display device (EPD) and preparation method thereof |
| TWI752565B (en) * | 2017-06-16 | 2022-01-11 | 美商電子墨水股份有限公司 | Electro-optic medium and method of forming an electro-optic medium |
| US11749218B2 (en) | 2017-06-16 | 2023-09-05 | E Ink Corporation | Method of forming an electro-optic medium |
| CN107632480A (en) * | 2017-09-25 | 2018-01-26 | 京东方科技集团股份有限公司 | Display panel and preparation method thereof, control method |
| US11092869B2 (en) | 2017-09-25 | 2021-08-17 | Beijing Boe Display Technology Co., Ltd. | Display panel, and methods for manufacturing and controlling the same |
| CN108279543A (en) * | 2018-02-26 | 2018-07-13 | 广州奥翼电子科技股份有限公司 | Electrophoresis showed diaphragm, electrophoretic display device (EPD) and electrophoretic display coating fluid |
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Application publication date: 20120919 |