KR20120119446A - In-plane switching mode liquid crystal display device - Google Patents

Abstract

PURPOSE: An in-plane switching mode liquid crystal display device is provided to compensate for a phase difference. CONSTITUTION: A light compensating layer(200) is located on an external surface of a second substrate. The light compensating layer is made of a transparent inorganic film. The transparent inorganic film has a uniaxial crystallization feature. A first polarization plate(119a) is formed on an external surface of a first substrate. A second polarization plate(119b) is located on the light compensating layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display (LCD)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transverse electric field type liquid crystal display device, and more particularly, to a transverse electric field type liquid crystal display device including an optical compensation layer that compensates for a phase delay of a liquid crystal layer.

Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image implementation by

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

Recently, an active matrix liquid crystal display device that drives liquid crystal with an electric field formed up-down has been widely used because of its excellent resolution and video performance. However, liquid crystal driving due to an electric field that is applied up-down has a disadvantage in that the viewing angle characteristics are inferior.

Accordingly, various methods have been proposed in order to overcome the disadvantage that the viewing angle is narrow. Among them, a liquid crystal driving method by a transverse electric field is attracting attention.

1 is a cross-sectional view of a general transverse electric field type liquid crystal display device.

As shown in the figure, the lower substrate 1, which is an array substrate, and the upper substrate 3, which is a color filter substrate, are spaced apart from each other and face each other. A liquid crystal layer 5 is interposed between the upper and lower substrates 1, .

On the lower substrate 1, the pixel electrode 21 and the common electrode 25 are formed on the same plane, and the liquid crystal layer 5 has a horizontal electric field L formed by the pixel electrode 21 and the common electrode 25. Works by.

A thin film transistor (TFT) is formed in each pixel area defined by a gate wiring (not shown) and a data wiring (not shown) in the lower substrate 1 of the transverse electric field type liquid crystal display device 10. In the upper substrate 3, a color filter layer (not shown) and a black matrix (not shown) are formed and bonded by a seal material (not shown) such as an epoxy resin.

In the transverse electric field type liquid crystal display device 10 which is driven as described above, the first and second polarizing plates 20 and 30 are positioned on each outside of the first and second substrates 1 and 2.

2 is a diagram illustrating a transmission axis of a polarizing plate used in a transverse electric field type liquid crystal display device.

As shown, the transmission axes of the first and second polarizing plates (20, 30 in Fig. 1) are perpendicular to each other. The transverse electric field type liquid crystal display device 10 of FIG. 1 implements black in a voltage off state when operating in a normally black mode.

That is, light of a component coinciding with the transmission axis of the first polarizing plate (20 in FIG. 1) among the light incident on the first polarizing plate (20 in FIG. 1) passes, and the second polarizing plate (30 in FIG. 1) transmits. Since the axis is perpendicular to the transmission axis of the first polarizing plate (20 in FIG. 1), light passing through the first polarizing plate (20 in FIG. 1) cannot pass through the second polarizing plate (30 in FIG. 1) to realize a black state. do.

By the way, the transmission axes of the first and second polarizing plates 20 and 30 of FIG. In the A direction inclined by α degrees in the H direction, the transmission axes of the first and second polarizing plates 20 and 30 in FIG. 1 do not appear to be orthogonal.

Therefore, in the A direction, the first and second transmission axes do not appear orthogonal to each other, and light leakage occurs. In particular, such light leakage is rotated by β degrees (azimuthal angle) in the transmission axis of the first polarizing plate (20 in FIG. 1), that is, between transmission axes of the first and second polarizing plates (20 and 30 in FIG. 1) orthogonal to each other. Occurs badly in the direction of.

Therefore, a change in contrast ratio, color shift, gray inversion, etc. may occur according to the viewing angle.

As described above, the transverse electric field type liquid crystal display device (10 of FIG. 1) has a small change in phase retardation of liquid crystal according to voltage in a manner in which a transverse electric field is applied to the liquid crystal layer (5 of FIG. And the viewing angle is excellent because the optical axes of the two polarizers 20 and 30 of FIG. 1 remain vertical, but light leakage occurs in the diagonal direction where the optical axes of the first and second polarizers 20 and 30 of FIG. 1 are broken vertically. This causes the deterioration of image quality.

In order to improve such deterioration of image quality in a diagonal direction, a compensation film (compensation film: not shown) should be applied, and the compensation film (not shown) compensates for the change in phase of light inside the liquid crystal layer (5 in FIG. 1). Compensation in the opposite direction in the film (not shown) solves the viewing angle problem.

Such a compensation film (not shown) was generally used by attaching to a polarizing plate (20, 30 of Figure 1), in this case, the process of adhering a compensation film (not shown) to the polarizing plate (20, 30 of Figure 1) The process is complicated, and the adhesive layer (not shown) is included, so that the overall thickness of the polarizing plates 20 and 30 of FIG. 1 becomes thick, thereby making it difficult to reduce thickness and weight.

In addition, the compensation film (not shown) is made of a multi-layer, the characteristics of the environment, such as heat or moisture of each layer is different, and if left in a high temperature and high humidity environment, peeling of the film, distortion and stains, etc. Done. As a result, the phase delay value fluctuates, causing a deviation in birefringence compensation.

An object of the present invention is to provide a transverse electric field type liquid crystal display device having a phase difference compensation function, which can be thinner and lighter, and which can reduce manufacturing costs by simplifying a manufacturing process. .

In order to achieve the above object, the present invention provides a liquid crystal panel comprising a liquid crystal layer interposed between the first and second substrates and the first and second substrates; An optical compensation layer disposed on an outer surface of the second substrate and formed of a transparent inorganic film having a uniaxial crystal; A first polarizing plate positioned on an outer surface of the first substrate and a second polarizing plate positioned above the optical compensation layer, wherein the phase difference value Δnd of the liquid crystal layer and the phase difference value Δn'd of the optical compensation layer ') Provides the same transverse electric field type liquid crystal display device.

In this case, the optical compensation layer has a crystallinity such as nanowires or nanorods, and extends in a direction perpendicular to the first and second substrates, wherein the optical compensation layer is nz> nx = ny (nx, ny is The refractive index in the XY direction of the plane, nz is the refractive index in the normal direction).

In addition, the light compensation layer is made of one selected from GaN, AIN, Al2O3, BeO, SiO2, TeO2, TiO2, ZnO, BaTiO3, the additional light compensation layer is made of a transparent conductive oxide (TCO).

The transparent conductive oxide is one selected from indium tin oxide (ITO), GaZnO, AlZnO, and InZnO.

As described above, according to the present invention, by forming an optical compensation layer made of a transparent inorganic film having a uniaxial crystal on the outer surface of the second substrate, thereby making it possible to compensate the phase difference of the liquid crystal layer, at a specific viewing angle By reducing the generation of light leakage, it is possible to prevent the lowering of the contrast ratio and to improve color inversion according to the viewing angle.

In particular, the volume and weight of the total polarizing plate can be reduced compared to the conventional one in which the compensation film is attached to the polarizing plate, thereby reducing the process cost, and the phase due to the peeling phenomenon, distortion, and staining of the compensation film made of the multilayer. The delay value fluctuates, thereby preventing the deviation of the birefringence compensation.

In addition, by making the light compensation layer have conductivity, there is an effect that the second substrate can be prevented from being damaged from static electricity or external charges.

1 is a cross-sectional view of a general transverse electric field type liquid crystal display device.
2 is a diagram showing a transmission axis of a polarizing plate used in a transverse electric field type liquid crystal display device.
3 is a cross-sectional view schematically showing a transverse electric field type liquid crystal display device according to an embodiment of the present invention.
4A to 4B are cross-sectional views illustrating operations according to whether an electric field is applied to a transverse electric field type liquid crystal display device according to an exemplary embodiment of the present invention.
Fig. 5 is a diagram showing an arrangement state of uniaxial crystals of the light compensation layer.
6A and 6B are simulation results of measuring light leakage at maximum luminance.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

3 is a schematic cross-sectional view of a transverse electric field type liquid crystal display device according to an exemplary embodiment of the present invention.

As illustrated, in the transverse electric field type liquid crystal display device 100, the first substrate 101, which is an array substrate, and the second substrate 102, which is a color filter substrate, face each other and are spaced apart from each other. The liquid crystal layer 103 is interposed between 101 and 102.

In this case, the plurality of gate wirings (not shown) and the common wirings (not shown) disposed in parallel with the gate wirings (not shown) are arranged on the first substrate 101 in parallel with a predetermined interval. And data wirings (not shown) that cross the two wirings (not shown and not shown), and particularly intersect with the gate wirings (not shown) to define the pixel region P.

In this case, a thin film transistor Tr is formed in the switching region TrA, which is an intersection point of the gate wiring (not shown) and the data wiring (not shown) of each pixel region P, and the display area (not shown) The common electrode 112 and the pixel electrode 114 are formed in AA.

Here, the thin film transistor Tr includes a gate electrode 111, a gate insulating film 113, a semiconductor layer 115, and source and drain electrodes 117 and 119.

A protective layer 116 is formed on the front surface of the first substrate 101 including the thin film transistor Tr, and the pixel electrode 114 is electrically connected to the drain electrode 119 of the thin film transistor Tr. do.

The common electrode 112 is formed at one side of the pixel electrode 114 in the display area AA at a predetermined interval, and the pixel electrode 114 and the common electrode 112 are alternately positioned, with a transverse electric field therebetween. Generates.

On the second substrate 102 facing the first substrate 101, a black matrix 121 having openings corresponding to the pixel regions P is formed, and R sequentially arranged to correspond to these openings. The color filter layer 123 including the G, B color filter patterns is formed.

An overcoat layer 125 is formed on the black matrix 121 and the color filter layer 123.

As described above, the horizontal electric field type liquid crystal display device 100 forms a common electrode 112 and a pixel electrode 114 on the first substrate 101, and generates a horizontal electric field between the two electrodes 112 and 114 to form a liquid crystal. By arranging the molecules in parallel with the horizontal electric field parallel to the substrates 101 and 102, the viewing angle of the liquid crystal display device can be widened.

First and second polarizing plates 119a and 119b for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 101 and 102, respectively.

At this time, the polarization axes of the first and second polarizing plates 119a and 119b are perpendicular to each other.

The transverse electric field type liquid crystal display device 100 having such a configuration maintains a constant cell gap between the two substrates 101 and 102 between the first substrate 101 and the second substrate 102 although not clearly shown in the drawing. To form a patterned spacer (not shown).

In addition, a liquid crystal layer 103 filled with an upper and lower alignment layer (not shown) interposed between the two substrates 101 and 102 and the liquid crystal layer 103 to determine an initial molecular alignment direction of the liquid crystal. Seal patterns (not shown) are formed along the edges of both substrates 101 and 102 in order to prevent leakage.

In particular, the transverse electric field type liquid crystal display device 100 of the present invention is characterized in that the optical compensation layer 200 made of an inorganic material is formed on the outer surface of the second substrate 102.

The optical compensation layer 200 compensates for the change in the phase of light in the liquid crystal layer 103 in the opposite direction, so that the optical axes of the first and second polarizing plates 119a and 119b are diagonally broken. It prevents light leakage from occurring. This will be described in more detail with reference to FIGS. 4A to 4B below.

4A to 4B are cross-sectional views illustrating an operation according to whether an electric field is applied to a transverse electric field type liquid crystal display device according to an exemplary embodiment of the present invention. .

Before briefly describing the operating characteristics, the configuration will be described. As shown in the drawing, the first substrate 101 and the liquid crystal layer 103 having the common electrode 112 and the pixel electrode 114 interposed therebetween. 102 is configured, and the first polarizing plate 119a and the second polarizing plate 119b are positioned on the outer surfaces of the first substrate 101 and the second substrate 102, respectively.

In addition, a backlight unit 130 is provided below the first polarizing plate 119a to supply light such that a difference in transmittance shown in the transverse electric field type liquid crystal display device 100 (FIG. 3) is expressed to the outside.

The transverse electric field type liquid crystal display device (100 in FIG. 3) having such a configuration applies a sufficient voltage to the liquid crystal molecules 103a initially oriented in the same direction as the transmission axis of one of the polarizing plates 119a and 119b. The long axis of 103a is arranged to be parallel to the electric field L.

If the dielectric anisotropy of the liquid crystal layer 103 is negative (-), the short axis of the liquid crystal molecules 103a is arranged side by side in the electric field (L).

Specifically, the first and second polarizing plates 119a and 119b attached to the outer surfaces of the opposing first and second substrates 101 and 102, respectively, are disposed such that their transmission axes are perpendicular to each other, and the first substrate The rubbing direction of the alignment film (not shown) formed on the 101 is parallel to the transmission axis of one of the polarizing plates 119a and 119b to be normally black mode.

That is, when no voltage is applied, the alignment direction of the liquid crystal molecules 103a is arranged in the same direction as the alignment direction of the initial alignment layer (not shown) to display a black state as shown in FIG. 4A.

At this time, the light of the component coinciding with the transmission axis of the first polarizing plate 119a among the light incident on the first polarizing plate 119a passes, and the transmission axis of the second polarizing plate 119b transmits the first polarizing plate 119a. Since it is perpendicular to the axis, the light passing through the first polarizing plate 119a does not pass through the second polarizing plate 119b, thereby implementing a black state.

When a voltage is applied to the common electrode 112 and the pixel electrode 114 to form an electric field L between the common electrode 112 and the pixel electrode 114, the liquid crystal molecules as shown in FIG. 4B. A major axis of the liquid crystal molecules 103a is arranged in a direction parallel to the direction in which the electric field is applied, so that the 103a indicates a white state.

At this time, the liquid crystal layer 103 interposed between the first and second substrates 101 and 102 has birefringence different in refractive index in the major axis direction and the minor axis direction of the liquid crystal molecule 103a.

Accordingly, a difference in refractive index occurs depending on the position viewed by birefringence, through which the phase difference occurs when the polarization state is changed while the light passes through the liquid crystal layer 103, and thus the first and second views when viewed from a position off the front face. Since the polarization axes of the polarizing plates 119a and 119b are not orthogonal, light leakage occurs in which the amount of light when viewed from a specific viewing angle and the amount of light when viewed from the front are different.

Accordingly, a change in contrast ratio, color shift, gray inversion, and the like may occur according to the viewing angle. The transverse electric field type liquid crystal display device (100 in FIG. 3) of the present invention occurs. By forming the light compensation layer 200 on the outer surface of the second substrate 102, the light leakage is prevented from occurring.

The optical compensation layer 200 compensates for the change in the phase of light in the liquid crystal layer 103 in the opposite direction, so that the optical axes of the first and second polarizing plates 119a and 119b are diagonally broken. It prevents light leakage from occurring.

In detail, the phase delay of the optical compensation layer 200 (thickness of the optical compensation layer × refractive index anisotropy) of the optical compensation layer 200 is equal to the phase delay of the liquid crystal layer 103 in the desired voltage range. In addition, it is preferable to adjust the driving voltage by making a desired black state at a desired voltage so that the phase has the opposite value or the difference between the absolute value of the phase delay value of the liquid crystal layer 103 is 0.2 um or less.

Here, the liquid crystal layer 103 of the transverse electric field type liquid crystal display device (100 in FIG. 3) retards incident light passing through the first polarizing plate 119a by λ / 2 (where λ is the wavelength of the light). The incident light is modulated by the linear polarization of the optical axis orthogonal to the linear polarization. That is, the phase retardation of the liquid crystal layer 103 of the transverse electric field type liquid crystal display device (100 in FIG. 3) is λ / 2.

Therefore, the phase delay value of the optical compensation layer 200 of the present invention also has λ / 2. Through the optical compensation layer 200 can be completely compensated for the viewing angle.

In this case, the phase delay value of the liquid crystal layer 103 may define the following formula (1).

λ / 2 = Δnd ............... Equation (1)

Δn represents the refractive index anisotropy of the liquid crystal layer 103, and d is the thickness of the liquid crystal layer 103.

Here, Δn, which is refractive anisotropy, may be defined as ne-no, where ne is a direction in which light vibrates with respect to the long axis direction of the liquid crystal molecules 103a, and no is vibration in light in a short axis direction of the liquid crystal molecules 103a. It is the direction to do it.

The liquid crystal molecules 103a of the liquid crystal layer 103 of the transverse electric field type liquid crystal display device (100 of FIG. 3) have a form lying in parallel with the surfaces of the substrates 101 and 102, and the refractive index is nx> ny = nz (nx, ny is a refractive index in the XY direction of the plane, nz is a refractive index in the normal direction), that is, ne = nx, no = ny = nz, (nx-ny) = Δn.

Therefore, in order to compensate for the phase delay of the liquid crystal layer 103, the optical compensation layer 200 of the present invention has a refractive index of nz> nx = ny (nx, ny represents a refractive index in the XY direction of the plane, and nz represents a normal line direction). Refractive index), that is, ne = nx, no = ny = nz, and (nz-ny) = Δn.

The optical compensation layer 200 is composed of a uniaxial crystal 201 having an optical axis extending in a direction perpendicular to the liquid crystal molecules 103a of the liquid crystal layer 103 such that the refractive index anisotropy Δn has nz-ny. desirable.

Thus, the optical compensation layer 200 according to the embodiment of the present invention is a transparent inorganic film having a uniaxial crystal 201 through a nano wire (nano wire) or a nano rod (nano rod), as shown in FIG. The optical compensation layer 200 has uniaxial optical anisotropy and further has an optical axis extending in a direction perpendicular to the substrates 101 and 102, that is, extending in the Z-axis direction.

Accordingly, the refractive index anisotropy of the light compensation layer 200 is zero when light is incident vertically, but changes according to the angle at which light enters, thereby canceling the phase delay of the liquid crystal layer 103. As a result, it is possible for the displayed image to prevent light leakage from occurring at a particular viewing angle.

Table 1 below shows the refractive index anisotropy of the transparent inorganic film having a uniaxial crystal 201 constituting the optical compensation layer 200 according to an embodiment of the present invention.

Refractive index no ne Δn Liquid crystal 1.479 1.563 0.084 decision Nitride GaN 2.415 2.312 -0.103 AIN 2.159 2.206 0.047 Oxide Al2O3 1.770 1.762 -0.008 BeO 1.720 1.736 0.016 SiO2 1.546 1.555 0.009 TeO2 2.291 2.450 0.158 TiO2 2.499 2.767 0.268 ZnO 2.020 2.037 0.017 Compound BaTiO3 2.452 2.401 -0.051

The light compensation layer 200 of the present invention can be appropriately selected and used in response to the thickness of the transparent inorganic film having the uniaxial crystal 201 of Table 1 and the phase delay value of the liquid crystal layer 103. .

That is, the phase difference value according to the refractive index anisotropy Δn and the thickness d of the liquid crystal layer 103, and the refractive index anisotropy Δn ′ and the thickness d ′ of the optical compensation layer 200 satisfy the following equation (2). To decide.

Δnd = Δn'd '.............. Equation (2)

By setting the refractive index anisotropy and thickness of the liquid crystal layer 103 and the optical compensation layer 200 in Equation (2), the displayed image is prevented from generating light leakage at a particular viewing angle.

As described above, the transverse electric field type liquid crystal display device (100 of FIG. 3) including the optical compensation layer 200 of the present invention reduces the generation of light leakage at a specific viewing angle, thereby preventing the contrast ratio from being lowered. Color inversion according to the viewing angle can be improved.

In particular, it is possible to reduce the volume and weight of the total polarizing plate (119a, 119b) compared to the conventional attachment of a compensation film (not shown) to the polarizing plate (20, 30 of Figure 1), it is possible to reduce the process cost, multilayer It is possible to prevent the occurrence of a deviation in the birefringence compensation by changing the phase delay value due to peeling phenomenon, distortion and stain of the compensation film (not shown).

6A to 6B show simulation results of measuring light leakage at the maximum luminance.

FIG. 6A illustrates a light leakage when a compensation film (not shown) is attached to a conventional polarizer (20 and 30 of FIG. 1) to compensate for phase delay of the liquid crystal layer (103 of FIG. 1). In the case of FIG. 1, a positive biaxial film 137a and a negative C component 137b are coated on the second polarizing plate 30.

At this time, the positive biaxial film has a phase difference value of 95 to 100 nm, and the negative C component has a phase difference value of 90 nm.

FIG. 6B illustrates an optical compensation layer (200 of FIG. 4B) on the outer surface of the second substrate 102 (FIG. 4B) of the liquid crystal display device 100 of FIG. 3, according to an exemplary embodiment of the present invention. As a result of measuring light leakage when the phase delay of 103 is compensated for, the positive A component is coated on the second polarizing plate 119b of FIG. 4B.

Here, the light compensation layer (200 in Fig. 4B) has a phase difference value of -88 nm, and the positive A component has a phase difference value of 145 nm.

As shown, the transverse electric field type liquid crystal display device 100 (FIG. 3) including the light compensation layer (200 in FIG. 4B) according to the exemplary embodiment of the present invention is disposed in a diagonal direction of the liquid crystal display device 100 (FIG. 3). It can be seen that the light leakage is greatly reduced compared to when using a conventional compensation film (not shown).

In this case, the liquid crystal display (10 of FIG. 1) including the conventional compensation film (not shown) may be confirmed that more light leakage occurs in a specific direction even in a diagonal direction of the liquid crystal display (10 of FIG. 1). This is because, as the conventional compensation film (not shown) is made of a multilayer, peeling phenomenon, distortion, and staining are generated by an environment of high temperature and high humidity, and a deviation occurs in birefringence compensation.

On the contrary, in the transverse electric field type liquid crystal display device (100 in FIG. 3) including the light compensation layer (200 in FIG. 4B) of the present invention, it can be confirmed that light leakage does not occur uniformly over all regions.

On the other hand, the light compensation layer (200 of FIG. 4b) of the present invention can be formed to have a conductivity, in this case, the second substrate (102 of FIG. 4b) of the transverse electric field type liquid crystal display device (100 of FIG. 3) is electrostatic Unnecessary charges such as inflow can be prevented from being damaged.

That is, the transverse electric field type liquid crystal display device (100 of FIG. 3) easily enters unnecessary charges such as static electricity, and in this case, affects the alignment direction of the liquid crystal molecules (103a of FIG. 4B) to impair normal operating characteristics.

In particular, the pixel electrode (114 in FIG. 4B) and the common electrode (112 in FIG. 4B) are both formed on the first substrate (101 in FIG. 4B), so that static electricity can be discharged to the outside through the second substrate (FIG. No means for discharging static electricity is formed in 102 of 4b, and the second substrate (102 in FIG. 4b) may be damaged by static electricity.

Accordingly, a transparent conductive metal layer (not shown) such as ITO is further formed on the outer surface of the second substrate 102 of FIG. 4B, but the transverse electric field type liquid crystal display device 100 of FIG. By making the light compensation layer (200 in FIG. 4B) formed on the outer surface of 102 of FIG. 4B to have conductivity, static electricity flowing into the second substrate (102 in FIG. 4B) through the light compensation layer (200 in FIG. 4B) may be formed. The same unnecessary charge can be discharged to the outside.

Through this, it is possible to prevent the second substrate (102 of FIG. 4B) from being damaged by unnecessary charge such as static electricity.

In this case, the light compensation layer 200 (in FIG. 4B) has a uniaxial crystal (201 in FIG. 5) and has conductivity by using a material of a transparent conductive oxide (TCO) series.

The transparent conductive oxide may be made of indium tin oxide (ITO), GaZnO, AlZnO, InZnO, or the like.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

201: Uniaxiality determination

Claims (6)

A liquid crystal panel including first and second substrates and a liquid crystal layer interposed between the first and second substrates;
An optical compensation layer disposed on an outer surface of the second substrate and formed of a transparent inorganic film having a uniaxial crystal;
A first polarizing plate positioned on an outer surface of the first substrate, and a second polarizing plate positioned above the optical compensation layer
And a phase difference value [Delta] nd of the liquid crystal layer and a phase difference value [Delta] n'd 'of the optical compensation layer.
The method of claim 1,
The optical compensation layer has a crystallinity such as nanowires or nanorods, and extends in a direction perpendicular to the first and second substrates.
The method of claim 1,
The optical compensation layer has a relationship of nz> nx = ny (nx, ny is a refractive index of the XY direction of a plane, nz is a refractive index of a normal line direction). The method of claim 1,
The optical compensation layer is a transverse electric field liquid crystal display device comprising one selected from GaN, AIN, Al2O3, BeO, SiO2, TeO2, TiO2, ZnO, BaTiO3.
The method of claim 1,
The horizontal light compensation layer is a transverse electric field type liquid crystal display device made of transparent conductive oxide (TCO).
The method of claim 1,
The transparent conductive oxide is indium tin oxide (ITO), GaZnO, AlZnO, InZnO is a transverse electric field type liquid crystal display device.

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