KR20050021121A - Liquid Crystal Display device - Google Patents

Abstract

PURPOSE: An LCD(Liquid Crystal Display) is provided to acquire the same wiring resistance as the conventional LCD in spite of narrowing the width of electrode, thereby enlarging an aperture ratio without the increase of the wiring resistance, by forming at least one of a pixel electrode and a common electrode to have a three-dimensional structure. CONSTITUTION: An IPS(In-Plane Switching) mode LCD has a pair of substrates(100,110), a liquid crystal layer(120) between the substrates, and a plurality of the first and the second electrodes(a,b) on one of the substrates. The first and the second electrodes are formed for driving liquid crystals of the liquid crystal layer. The first electrodes or the second electrodes have three-dimensional structures and have the width of 0.1 to 5.0 micrometers. Also, the first electrodes or the second electrodes protrude from the lower end(or the upper end) of the liquid crystal layer toward the inside of the liquid crystal layer which is greater than 0.3 micrometers. Distance between the first electrodes and the second electrodes has 1 to 12 micrometers.

Description

Liquid crystal display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to liquid crystal displays used in cellular phones, PCs, TVs, and the like, and more particularly, to liquid crystal display devices capable of improving aperture ratio and response speed characteristics.

The liquid crystal display device is formed by arranging two substrates on which the field generating electrodes are formed, facing the surfaces on which the two electrodes are formed, injecting a liquid crystal material between the two substrates, and then applying a voltage to the two electrodes. It is a device that displays an image by the transmittance of light which is moved accordingly by moving liquid crystal molecules by an electric field.

These liquid crystal display devices have various forms. Currently, active matrix liquid crystal display devices in which a thin film transistor and pixel electrodes connected to the thin film transistors are arranged in a matrix manner have attracted the most attention due to their excellent resolution and ability to implement video.

In general, the device has a structure in which a pixel electrode is formed on a lower substrate, and a common electrode is formed on an upper substrate, and the liquid crystal molecules are driven by an electric field perpendicular to the substrate applied between the two electrodes. This is excellent in the characteristics such as transmittance and aperture ratio, and the common electrode of the upper plate serves as a ground role can prevent the destruction of the liquid crystal cell due to static electricity.

However, such a liquid crystal display device has a disadvantage that the viewing angle characteristics are not excellent. In order to overcome this, various methods have been proposed, one of which is a transverse electric field method, that is, an In-Plane Switching (IPS) mode liquid crystal display device.

The transverse electric field type liquid crystal display device has already been announced more than 20 years ago, but recently, a wide viewing angle has been attracting attention and has been used in an active matrix liquid crystal panel. In particular, since a wide viewing angle is obtained even without using an optical compensation plate, it is mainly used for TV.

In the transverse electric field type liquid crystal display device, a transparent first substrate and a second substrate are generally disposed between two deflection plates, and liquid crystal molecules having a thickness of 2-10 μm are sandwiched between the first and second substrates. On the substrate, two electrodes (pixel electrode, common electrode) are combined in a comb-tooth shape to form a structure in which a transverse electric field is applied to the liquid crystal molecules.

Accordingly, device driving is performed by modulating the arrangement of liquid crystal molecules between the electrodes in a planar manner by the voltage applied between the pixel electrode and the common electrode to modulate the transmittance of light and display an image.

When the liquid crystal display device is designed by the transverse electric field as described above, since the arrangement of liquid crystal molecules on the surface of the substrate is changed in a direction parallel to the substrate, a liquid crystal display panel having a good display quality with less viewing angle dependency of optical modulation is obtained. Can be.

However, in such a transverse electric field system, highly conductive opaque metal (eg, Al, Cr, alloys, etc.) electrodes are arranged in the shape of a comb, so that the aperture ratio for transmitting light is small, and the brightness of the screen is ensured. There is a problem that is difficult.

In order to increase the aperture ratio, it is effective to narrow the width of the opaque electrode, but in this case, conventional electrode patterning by photosensitive resin has a limitation on the etching accuracy of the electrode, and technical limitations such as disconnection of the wiring and increase in wiring resistance are limited. Follows.

As another method, it is effective to widen the distance between the pixel electrode and the common electrode, but when the width between these electrodes is larger than 12 mu m, there is a problem that the driving voltage becomes high and the response speed of the liquid crystal becomes slow.

If the distance between the electrodes is narrowed to less than 10 μm in consideration of the response speed, the response speed is faster, but the opening ratio is worse and the short between the electrodes is not preferable.

In other words, the transverse electric field mode has a merit of wide viewing angle, but in order to improve the aperture ratio, a comb-type opposing electrode distance needs to be increased, and when the distance between electrodes increases, the response speed becomes slow. It is considered that high speed response cannot be realized even at high brightness even with active driving.

In the case of the active driving panel, the electrodes are located in the PI film or the insulating film under the liquid crystal layer, and are driven by the curved electric field. Therefore, the effective voltage of the liquid crystal is low, the molecules at the interface of the liquid crystal layer are difficult to move, and the response speed is slow. For this reason, there is a problem that the driving voltage should be high.

Therefore, the present invention, by designing at least one of the pixel electrode and the common electrode in a three-dimensional structure, even if the electrode width is narrow compared to the conventional liquid crystal display device to ensure the same level of wiring resistance and improve the aperture ratio characteristics compared to the conventional The purpose is to provide.

It is another object of the present invention to provide a liquid crystal display device capable of realizing a high-speed response by designing at least one of these electrodes higher than the lowermost part of the liquid crystal layer so that a linear electric field can be applied to the liquid crystal.

It is also an object of the present invention to provide a liquid crystal display device that can be used in a TV, which can be colorized, has a good viewing angle, and is bright and has a fast response speed by attaching a color filter on one substrate.

In one embodiment of the present invention, in order to achieve the above object, a transverse electric field method (IPS) having a liquid crystal layer sandwiched between a pair of substrates and having a plurality of electrodes for driving a liquid crystal on either substrate of the substrate It is an improved display system, and on one substrate, at least one electrode of the corresponding electrode has a three-dimensional structure, 0.3 µm or more in the middle of the liquid crystal layer from the lower (or upper) liquid crystal layer, and the electrode width is 0.1 to 5.0 µm. And a distance between the electrodes is 1 to 12 mu m.

In the second embodiment of the present invention, in order to achieve the above object, it is an active matrix type liquid crystal display device having an improved transverse electric field system, and on one substrate, the corresponding electrode is cut out, and at least one of the electrodes is the lowermost liquid crystal layer. Provided is a liquid crystal display device characterized in that the aperture ratio is 0.3 μm or more in the middle of the liquid crystal layer at the top (or the top), and the width of the electrode is 0.1 to 5.0 μm, and the distance between the electrodes is 1 to 12 μm. do.

In order to achieve the above object, in the third embodiment of the present invention, an active matrix type color display device having an improved transverse electric field system is provided. On one substrate, an opposite electrode is cut out, and at least one of the electrodes is a lowermost liquid crystal layer. (Or the uppermost part) 0.3 µm or more in the middle of the liquid crystal layer, and the portion where the electrode is close to the liquid crystal layer has a taper for preventing domain generation and widening the viewing angle, and having an electrode width of 0.1 to 5.0 µm. There is provided a liquid crystal display device, which is characterized in that.

In an embodiment of the present invention, in order to achieve the above object, it is an active matrix type color display device having an improved transverse electric field system, and both electrodes of the electrode come out in the middle of the liquid crystal layer from the lowermost (or uppermost) of the liquid crystal layer. The edge portion in the height direction of has a taper for preventing domain generation and widening the viewing angle, making its electrode width up to 0.1 to 5.0 µm, improving aperture ratio, and applying a linear electric field to the liquid crystal efficiently. A liquid crystal display device is provided.

In the fifth embodiment of the present invention, in order to achieve the above object, it is an active matrix type color display device having an improved transverse electric field system, and either direction of the electrode is 0.3 m or more in the middle of the liquid crystal layer at the bottom (or top) of the liquid crystal layer. The height of the counter electrode which differs by 0.1 micrometer or more, generate | occur | produces two types of inclination electric fields (slope electric field), and made the aperture ratio favorable by setting the electrode width to 0.1-5.0 micrometers, The liquid crystal display characterized by the above-mentioned. An element is provided.

In the sixth embodiment of the present invention, in order to achieve the above object, it is an active matrix type color display device having an improved transverse electric field system, and one direction of the cut electrode is 0.3 占 퐉 or more in the middle of the liquid crystal layer at the lowermost (or uppermost) liquid crystal layer. A liquid crystal display device is provided, which is an electrode arranged in a square, zigzag and S-shape, and has a wide viewing angle and good aperture ratio.

In the seventh embodiment of the present invention, in order to achieve the above object, it is an active matrix type color display device having improved transverse electric field system, the electrode is made of transparent or opaque material such as photoresist or glass, and the whole or part of the surface is transparent. The present invention provides a liquid crystal display device which is plated or coated with an opaque conductive material.

When the liquid crystal display device is designed with the above structure, the aperture ratio can be increased by taking at least one direction of the pixel electrode and the common electrode in a three-dimensional structure and by narrowing the electrode width. In addition, by protruding a part of the electrode into the liquid crystal layer, it is possible to apply a linear electric field to the liquid crystal, thereby realizing a high-speed response with high brightness.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1A to 1J are cross-sectional views showing representative examples of the shape and material of an electrode that can be used in the present invention.

As shown in the cross-sectional view, an electrically conductive material such as Al, Al alloy, Mo, Cr, Au, Ag, ITO, etc. may be used, and these metals may be used in combination with the surface in multiple layers, and pure Al may oxidize the surface. Therefore, it is possible to stabilize, and can also be used in the form of a resist + Al alloy. If a transparent electrode such as ITO is used, the light transmittance is further improved. In the case of using a transparent electrode, it is preferable to apply in the form of ITO + transparent resist, transparent resist-ITO, resist-ITO, or the like. These metal electrodes can be fabricated on a substrate by a well-known method such as sputtering, and as shown, it is preferable to fabricate such that the upper ends have a tapered shape.

2A to 2F illustrate an example of a comb-shaped electrode pattern applicable to a unit pixel.

Here, as an example, only six cases are shown, but not limited to the electrode structure shown in these figures, and in the case of the electrode &lt; <type, any one or more bent portions may be used. Examples include a zigzag shape and an S shape.

In addition, these patterns shown in Figs. 2A to 2F may be used side by side in right, left, up and down symmetry, or may be used in combination of a plurality. In this case, at least one of the opposing electrodes, that is, at least one of the pixel electrode a and the common electrode b, must be designed to protrude a predetermined height into the liquid crystal layer, and the distance between the electrode of the pixel electrode and the common electrode is less than 10 μm. It is preferable to set it as the width | variety of these electrodes, and it is good to form in 0.1-5.0 micrometers. In addition, the height of the electrode protruding into the liquid crystal layer and the height of the electrode opposed thereto are preferably designed to be different from each other by 0.1 占 퐉 or more to form an electrode design by generating two kinds of gradient electric fields.

The height of the electrode protruding into the liquid crystal layer is 0.3 μm or more, preferably limited to 1/3 or less of the thickness of the liquid crystal layer. When using an opaque material as the electrode, when the electrode thickness is too high, the viewing angle in the lateral direction becomes worse. Because.

In addition, as mentioned in the drawings of FIGS. 1A to 1J, the front ends of the upper ends of the electrodes (a) and (b) are preferably designed to have a tapered shape. This is because it not only prevents the occurrence of foreground, but also widens the viewing angle.

On the other hand, when the electrode is transparent, if the electrode height is 0.3 μm or more, there is no particular limitation in setting the protrusion height to approximately the same as the thickness of the liquid crystal layer. However, when using a transparent electrode, it is necessary to pay attention to the light from the upper part of the electrode.

As an experimental example to confirm this, as a result of simulation by autronic's 2-DIMOS, the response speed in the case of the liquid crystal layer thickness of 3.8 μm, the distance between the electrodes 10 μm, the electrode width 5 μm, and the electrode height of 2000 μs was 31 ms. The response speed of 19 ms was obtained by setting an electrode width of 2 micrometers and an electrode height of 10000 micrometers under other conditions. The aperture ratio was 83% and improved by more than 15%. Although the transmittance | permeability fell a little in relation to "(triangle | delta) n (refractive index of liquid crystal layer) x d (liquid crystal layer thickness)", the simulation result was obtained that it can be improved by making thickness of a liquid crystal layer thick a little.

Regarding the rubbing of the alignment film, it is preferable that the substrate side where the electrode of the present invention is present is deviated by about 0-15 ° from the comb-shaped electrode side. If it greatly deviates, staining is likely to occur due to the step difference of the electrode. In addition, when a stain is easy to generate | occur | produce, it is also possible to orientate by applying energy, such as UV, a laser, and soft X-rays. Moreover, although a column spacer can also be used for controlling the thickness of a liquid crystal layer, an electrode may be produced by overlapping a spacer and you may make it separately. Further, as long as the effects of the present invention are not lost, other electrodes for controlling response speed, orientation, static electricity, and the like may be provided on the substrate opposite to the pair of comb-shaped electrodes.

For the sake of understanding, examples of the transverse electric field type liquid crystal display devices to which the present electrode structure is applied are described below, but the present invention is not limited to the described embodiments and is merely an example for reference. . Based on this, the embodiments will be described below.

3A and 3B illustrate a unit pixel structure of a liquid crystal display device to which the electrodes of FIGS. 2A to 2F are applied, and FIG. 3A is a front view thereof, and FIG. 3B is X of FIG. 3A. It is sectional drawing which cut -X 'part.

As shown in FIGS. 3A and 3B, the liquid crystal layer 120 having a thickness of 5 μm (t) is formed between two transparent glass substrates 100 and 110 by a spherical spacer (not shown). The glass substrate 100 is sandwiched so that the electrodes a and b each having a height h of 0.5 µm and a width w of 3 µm are disposed so that the distance d between the electrodes is 6 µm apart. Created a cell. At this time, the electrodes (a), (b) was designed in a comb structure of Al material, the front end of the electrode is designed in a round tapered shape. The surfaces of the Al electrodes (a) and (b) were coated with surface alumina, and both glass substrates 100 and 110 were coated with a rubbed alignment layer 130 to a thickness of 800 Å. A deflection plate (not shown) was attached to the outside of the two glass substrates 100 and 110, thereby producing a black and white normal black liquid crystal display element.

When the response speed was measured by applying the above structure, it was obtained 18 ms at τr + τd, and the aperture ratio was measured at 67%. The response speed was measured with normal white by changing the angle of the deflection plate, but the result of the same response speed was obtained. Here, τ represents the response speed of the liquid crystal, subscript r represents rising and subscript d represents decay.

In comparison with the first embodiment, the conventional transverse electric field type liquid crystal display device was used as a comparative example, and the liquid crystal layer had a thickness of 5 μm in the same manner as in the first embodiment, and the height and width of the Al electrode were 0.1 μm and 5, respectively. An LCD having a structure of µm and arranged so that the distance between electrodes was 6 µm was produced. When the response speed was measured, 24 ms was obtained at τr + τd. The aperture ratio was measured at 55%.

Comparing the first example and the comparative example, it was confirmed that both the response speed and the aperture ratio were improved by 20% or more, the cross-sectional area of the electrode was secured by about three times, and the wiring resistivity was reduced by 1/3. From this, it can be seen that the present invention is considerably superior to the conventional display device.

At this time, the front end of the upper end of the electrode (a), (d) protruding in the liquid crystal layer 120 has a tapered shape so that the foreground (disclination) does not occur, but the electrode is below the liquid crystal layer 120 In the case of, the shape of the electrode is not a problem since it is not involved in the alignment of the liquid crystal layer.

4A and 4B illustrate a unit pixel structure of a liquid crystal display device to which the electrodes of FIGS. 2A to 2F are applied, and FIG. 4A is a front view thereof, and FIG. 4B is X of FIG. 4A. It is sectional drawing which cut -X 'part.

As shown in FIGS. 4A and 4B, in order to increase the viewing angle, the electrodes (a) and (b) are designed in the shape of a comb, but are fabricated in a structure that is bent twice in a shape of the liquid crystal layer 120. The cell whose thickness t was 7 micrometers was created. In addition, one electrode (b) is projected to a height (h) of 1.0㎛ on the liquid crystal layer 120, and the electrode (a) against it is designed to be located below the liquid crystal layer 120, the distance between the electrodes ( d) was 4 micrometers, and the electrode width w was produced at 2 micrometers.

The liquid crystal display panel manufactured with the above structure had good viewing angle characteristics even in the lateral direction, and the aperture ratio was 66%, and the response speed was measured to be 13 ms. As a result, it can be seen that the structure proposed in the present embodiment has a higher opening ratio than the comparative example, and is an excellent structure with a faster response speed.

5A and 5B illustrate a unit pixel structure of an active-drive type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, and FIG. 5A is a front view thereof. 5B is a cross-sectional view taken along the line X-X 'of FIG. 5A.

As shown in FIGS. 5A and 5B, a liquid crystal layer 120 having a thickness of 4 μm is sandwiched between two transparent glass substrates 100 and 110, and a TFT is disposed on one glass substrate 100. The cell was prepared such that the gate insulating film 150 and the overcoating film 140 were sequentially stacked, and the color filter layer 160 was disposed on the glass substrate 110 on the opposite side thereof. In the glass substrate 100 on the side where the TFT is formed, electrodes (a) and (b) having different heights having a rounded tapered shape at the front ends are arranged with a distance of 7 μm between the electrodes. Made as comb as possible. At this time, one electrode (b) is formed on the gate insulating film 150 to be placed under the liquid crystal layer 120, and the electrode (a) opposed to this is formed on the overcoat layer 140 to form a liquid crystal layer ( 120) was designed to protrude to a height (h) of 0.3㎛. Here, reference numeral G / L denotes a gate line, D / L denotes a data line, S denotes a source electrode which is a branch of the data line, and D denotes a drain electrode which is a branch of the electrode line. These electrodes (a) and (b) were all formed of Mo-Al-Mo material, and the electrode width (w) was manufactured to 3 micrometers. "Δn (refractive index of liquid crystal) x d (liquid crystal layer thickness)" was set to 0.32. Both glass substrates 100 and 110 were coated with a rubbed alignment layer 130 to a thickness of 600 kPa, and two glass substrates 100 and 110 were attached with a deflection plate (not shown) to the outside.

When the response speed was measured by applying the above structure, 17 ms was obtained at τr + τd, and the aperture ratio was measured at 70%.

6A and 6B illustrate a unit pixel structure of an active-drive type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, and FIG. 6A is a front view thereof. 6B is a cross-sectional view taken along the line X-X 'of FIG. 6A.

As shown in FIGS. 6A and 6B, in this embodiment, the electrodes a and b are comb-shaped, that is, the " shaped shape is bent twice, and the thickness t of the liquid crystal layer 120 is 5 μm. And a cell having an electrode width (w) of 4 µm and an inter-electrode distance d of 6 µm. One electrode (a) is protruded 0.4㎛ height (h) on the liquid crystal layer 120, the electrode (b) is designed to be located below the liquid crystal layer 120, the electrode protruding into the double liquid crystal layer ( a) was made of Mo-Al-Mo material, and the electrode (b) opposed thereto was made to a height of 0.1㎛ by coating Mo on Al. "Δn (refractive index of liquid crystal) x d (liquid crystal layer thickness)" was set to 0.40, and the alignment film 130 was formed to a thickness of 800 GPa. Herein, reference numeral 170 denotes a black matrix.

When the response speed was measured by applying the above structure, it was obtained in 16ms at τr + τd and the aperture ratio was measured at 69%.

7A and 7B illustrate a unit pixel structure of an active driver type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, and FIG. 7A is a front view thereof. 7B is a cross-sectional view taken along the line X-X 'of FIG. 6A.

As shown in Figs. 7A and 7B, in this embodiment, the electrodes a and b are comb-shaped, i.e., have a comb-shaped structure, and the thickness t of the liquid crystal layer 120 is 5 mu m, and the electrode width. A cell was prepared in which (w) was 2 µm and the distance d between electrodes was 5 µm. These electrodes (a) and (b) used a structure coated with ITO on the surface of the photoresist, and designed to protrude 1.0 μm in height (h) onto the liquid crystal layer. "Δn (refractive index of liquid crystal) x d (liquid crystal layer thickness)" was set to 0.32, and the alignment film 130 was formed to a thickness of 600 GPa.

When the response speed was measured by applying the above structure, it was obtained as 15ms at τr + τd, and the aperture ratio was measured as 71%.

8A and 8B illustrate a unit pixel structure of an active-drive type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, and FIG. 8A is a front view thereof. 8B is a cross-sectional view taken along the line X-X 'of FIG. 6A.

As shown in Figs. 8A and 8B, in this embodiment, the electrodes a and b are comb-shaped, &lt; have a &lt; -shaped structure, and the thickness t of the liquid crystal layer 120 is 6 mu m, the electrode width. (w) was 2 micrometers, and the cell of which the distance d between electrodes was 6 micrometers was created. The electrode used a structure coated with a projection on the surface of the transparent photoresist and coated with ITO on the surface, and designed to protrude 2.0 μm in height (h) onto the liquid crystal layer. The alignment film 130 was formed to a thickness of 600 GPa.

When the response speed was measured by applying the above structure, it was obtained in 14 ms at τr + τd, and the aperture ratio was measured to be 90% or more.

9A and 9B illustrate a unit pixel structure of an active-drive type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, and FIG. 9A is a front view thereof. 9B is a cross-sectional view taken along the line X-X 'of FIG. 6A.

As shown in FIGS. 9A and 9B, in the present embodiment, the cells are placed so that the electrodes a and b are placed on one side of the color filter layer 160 on the glass substrate 100 provided with the color filter layer 160 and the TFT. Created. In this case, too, as shown in FIG. 5B, electrodes (a) and (b) having different heights are designed in a comb-shaped structure, that is, a | -shaped structure, with an electrode width w of 3 µm and an inter-electrode distance d The cell was created so that it might be 6 micrometers and the thickness of the liquid crystal layer 120 may be 5 micrometers. At this time, one electrode (b) is designed to be disposed on the color filter layer 160 to be placed under the liquid crystal layer 120, and the electrode (a) opposed to this is disposed on the overcoat layer 140 to form a liquid crystal layer ( 120) was designed to protrude at a height h of 1.0 mu m. Moreover, the electrode a which protruded on the liquid crystal layer 120 was produced by coating ITO on a transparent resist, and the electrode a of the other side was made of ITO. The alignment layer 130 is formed to a thickness of 800 Å, and reference numeral 170 denotes a black matrix.

Applying the above structure, the aperture ratio was measured to be 90% or more.

As can be seen from the above embodiment, when the transverse electric field type liquid crystal display device is manufactured by applying the electrode structures shown in Figs. 2A to 2F, at least one of the pixel electrode and the common electrode has a three-dimensional structure and an electrode width. It can be seen that by narrowing the aperture ratio can be significantly increased than before.

Further, by protruding a part or all of the electrodes into the liquid crystal layer, it becomes possible to apply a linear electric field to the liquid crystal, thereby realizing high-speed response with high brightness.

Further, the liquid crystal material may be used as a positive material or as a negative material as Δε, and a chiral agent may be added as long as the orientation is not broken. The alignment film can be used horizontally, vertically, or in the middle thereof to the extent that it does not adversely affect the physical properties of the present invention.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments and can be variously modified and implemented by those skilled in the art without departing from the technical scope of the present invention.

As described above, according to the present invention, by designing at least one or both of the pixel electrode and the common electrode in a three-dimensional structure, even if the electrode width is narrow compared to the existing, wiring resistance proportional to the cross-sectional area can be secured to the same level as in the prior art. As a result, the aperture ratio characteristics can be improved without technical limitations such as disconnection of wiring and increase in wiring resistance. In addition, by designing at least one of these electrodes higher than the lowermost part of the liquid crystal layer, it is possible to apply a linear electric field to the liquid crystal, thereby realizing a high-speed response with high brightness. In addition, since color can be formed by attaching a color filter on either substrate, it is possible to apply this structure to a TV having a good viewing angle and a bright and fast response speed.

1a to 1j is a view showing a representative example of the shape and material of the electrode proposed in the present invention.

2A to 2F are views illustrating an example of a comb-shaped electrode pattern proposed in the present invention.

3A and 3B illustrate a unit pixel structure of a liquid crystal display device to which the electrodes of FIGS. 2A to 2F are applied, according to a first embodiment of the present invention.

3a is a front view thereof;

3B is a cross-sectional view taken along the line X-X 'of FIG. 3A.

4A and 4B illustrate a unit pixel structure of a liquid crystal display device to which the electrodes of FIGS. 2A to 2F are applied, according to a second embodiment of the present invention.

4A is a front view thereof;

4B is a cross-sectional view taken along the line X-X 'of FIG. 4A.

5A and 5B illustrate a unit pixel structure of an active driver type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, according to a third embodiment of the present invention.

5A is a front view thereof;

5B is a cross-sectional view taken along the line X-X 'of FIG. 5A.

6A and 6B illustrate a unit pixel structure of an active driver type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, according to a fourth embodiment of the present invention.

6A is a front view thereof;

6B is a cross-sectional view taken along the line X-X 'of FIG. 6A.

7A and 7B illustrate a unit pixel structure of an active driver type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, according to a fifth embodiment of the present invention.

7A is a front view thereof;

FIG. 7B is a cross-sectional view taken along the line X-X 'of FIG. 7A.

8A and 8B illustrate a unit pixel structure of an active driver type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, according to a sixth embodiment of the present invention.

8A is a front view thereof;

FIG. 8B is a cross-sectional view taken along the line X-X 'of FIG. 8A.

9A and 9B illustrate a unit pixel structure of an active driver type color liquid crystal display with a TFT to which the electrodes of FIGS. 2A to 2F are applied, according to a seventh embodiment of the present invention.

9A is a front view thereof;

9B is a cross-sectional view taken along the line X-X 'of FIG. 9A.

Claims (7)

It is a display system which improved the transverse electric field system (IPS) which has a liquid crystal layer clamped by a pair of board | substrate, and has a some electrode for driving a liquid crystal to either board | substrate of the said board | substrate, At least one electrode of the electrode has a three-dimensional structure, 0.3 ㎛ or more in the middle of the liquid crystal layer from the lower (or upper) of the liquid crystal layer, the electrode width is 0.1 ~ 5.0 ㎛, the distance between electrodes is 1 to 12 ㎛ Liquid crystal display device. It is an active matrix liquid crystal display device having an improved transverse electric field system, and a counter electrode is cut on one substrate, and at least one of the electrodes is 0.3 μm or more in the middle of the liquid crystal layer at the bottom (or top) of the liquid crystal layer, In addition, the width of the electrode is up to 0.1 ~ 5.0㎛, the liquid crystal display device characterized in that the aperture ratio is good, the distance between the electrodes to 1 ~ 12㎛. It is an active matrix type color display device having an improved transverse electric field system, and a counter electrode is cut on one substrate, and at least one of the electrodes is 0.3 μm or more in the middle of the liquid crystal layer at the bottom (or top) of the liquid crystal layer, The liquid crystal display device further comprising a taper for preventing a domain from being generated, widening the viewing angle, and improving an aperture ratio of an electrode width of 0.1 to 5.0 µm. The method according to claim 3, wherein both directions of the electrode come out at least 0.3 μm in the middle of the liquid crystal layer from the bottom (or top) of the liquid crystal layer, and the edge portion in the height direction of the electrode has a taper for preventing domain generation and widening the viewing angle. And an electrode width of up to 0.1 to 5.0 占 m, an opening ratio being improved, and a liquid crystal display device having a linear electric field efficiently applied to the liquid crystal. The liquid crystal layer according to claim 3, wherein one of the electrodes has a direction of 0.3 µm or more in the middle of the liquid crystal layer at the bottom (or top) of the liquid crystal layer, and the height of the corresponding electrode differs by 0.1 µm or more. A slope electric field) is generated, and the aperture ratio is improved by setting the electrode width to 0.1 to 5.0 mu m. 4. The electrode according to claim 3, wherein the one direction of the cut electrode is an electrode arranged in the middle of the liquid crystal layer at the lowermost (or uppermost) of the liquid crystal layer and arranged in a zigzag, zigzag, or S-shape, and has a wide viewing angle and an aperture ratio. A liquid crystal display device, characterized by good. 4. The liquid crystal display device according to claim 3, wherein the electrode is made of a transparent or opaque material such as photoresist or glass, and all or part of the surface is plated or coated with a transparent opaque conductive material.