KR100614696B1 - LCD Display - Google Patents

Abstract

The present invention discloses a liquid crystal display device, comprising: a lower substrate provided with a reflective electrode, a vertical alignment film disposed on the lower substrate and having a pretilt angle of any one of 80 to 90 degrees and 2 degrees or less, and a lower substrate. An opposite upper substrate, a horizontal alignment film disposed on the upper substrate and having a pretilt angle of 2 ° or less and 80 to 90 °, opposite to the pretilt angle of the vertical alignment film, interposed between the two substrates, and whether an electric field is applied A liquid crystal layer of HAN mode for converting the phase of transmitted light according to the present invention, a phase film having a λ / 4 phase compensation function arranged on the outer surface of the upper substrate and converting linearly polarized light into circularly polarized light, A polarizing plate for converting incident natural light into linearly polarized light,

The phase delay value (dΔn) of the HAN mode liquid crystal layer is 0.36 to 0.40 µm,

The transmission axis of a polarizing plate is 42-48 degrees,

The optical axis of retardation film is 167-173 degrees,

The alignment angle of the vertical alignment layer is -40 to -50 ° with respect to the horizontal line,

The orientation angle of the horizontal alignment film is 40 to 50 degrees with respect to the horizontal line.

Description

Liquid Crystal Display {LIQUID CRYSTAL DISPLAY}

1 is a cross-sectional view schematically showing a conventional reflective liquid crystal display device.

Figure 2 is a schematic cross-sectional view of a HAN mode liquid crystal display device according to the present invention.

3 is a graph showing a reflectance relationship according to a cell gap;

4 and 6 are diagrams showing the axial arrangement of the components of the twisted HAN mode liquid crystal display according to the present invention.

5 and 7 are graphs for explaining reflectance characteristics according to voltages in FIGS. 4 and 6, respectively.

8 is a process cross-sectional view for explaining a liquid crystal display of the multi-domain twist HAN mode according to the present invention.

9 is a process cross-sectional view for explaining a twisted HAN & TN mode mixed transflective liquid crystal display device according to the present invention.

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which a cell gap margin is increased while improving a reflectance and contrast ratio by optimizing a characteristic parameter.

Reflective liquid crystal display devices that do not require a backlight are useful for portable display devices because they can achieve low power consumption, thinness, and light weight, and their demands are gradually increasing as the market of mobile phones and portable devices expands.

Such a reflective liquid crystal display device includes a lower substrate, a reflective electrode, a lower alignment layer, a liquid crystal layer, an upper alignment layer, an upper transparent electrode, an upper substrate, a phase film, and a polarizing plate. Have

In addition, the liquid crystal display device may be classified into a twisted nematic (TN) type, a guest host (GH) type, an electrically controlled birefringence (ECB) type, and an optically compensated birefringence (OCB) type according to an operation mode. Recently, the liquid crystal display of the TN mode has been widely used in portable computers and measuring devices, but has a problem that the viewing angle is narrow and the response speed is slow.

On the other hand, the liquid crystal display of the ECB mode is to induce a change in the light transmittance by changing the birefringence of the liquid crystal cell, a typical example is a HAN (Hybrid-Aligned Nematic) ECB liquid crystal display device. Since the HAN mode operates at a relatively low voltage and has a fast response speed, studies are being actively conducted in the OCB mode using optical changes of the liquid crystal cell.

The display implementation according to the optical properties of the reflective liquid crystal display device is as follows.

When no voltage is applied, the linearly polarized light passing through the polarizing plate passes through the phase film and becomes circularly polarized light, for example, left circularly polarized light, which is converted into linearly polarized light while passing through the liquid crystal layer and reflected by the reflective electrode. The reflected linearly polarized light changes to left circularly polarized light while passing through the liquid crystal layer, and then passes through the phase film, and the polarization direction is transformed into linearly polarized light parallel to the polarization axis of the polarizing plate and passes through the polarizing plate, whereby the state of white Is implemented.

When voltage is applied, the light converted to the left circularly polarized light through the polarizing plate and the phase film passes through the liquid crystal layer as it is without any change and is reflected by the reflective electrode to be the right circularly polarized light, and then passes through the liquid crystal layer and the phase film and the polarization direction is changed to the polarizing plate. It is deformed into linearly polarized light perpendicular to the polarization axis of, and thus cannot pass through the polarizing plate, thereby implementing a dark state.

On the other hand, in such a reflective liquid crystal display device, a good display screen depends on how to optimize the characteristic values of each component. That is, in order to effectively increase the reflectance in the reflective liquid crystal display device, the transmission axis angle of the polarizing plate, the optical characteristics of the phase film, the thickness of the liquid crystal layer (d), the phase delay value (dΔn) of the liquid crystal layer, the alignment angle of the alignment film, and the polarizing plate The characteristics such as the transmission axis angle and the optical structure of the phase film should be optimized.

Hereinafter, a cell configuration of a conventional reflective liquid crystal display device for implementing a good display screen will be described.

1 is a schematic cross-sectional view of a conventional reflective liquid crystal display device.

In the conventional reflective liquid crystal display device, as shown in FIG. 1, the lower substrate 1 having the reflective electrode 2 and the upper substrate disposed opposite to the lower substrate 1 and having the color filter 5 are provided. The liquid crystal layer 3 interposed between the substrate 4, the positive substrates 1 and 4, and the phase films arranged on the outer surface of the upper substrate 4, i.e., λ / 2 and λ / 4 Lambda / 2 film (9), lambda / 4 film (8) for optical compensation having a phase difference of and a polarizing plate (10) disposed on the outer side of the lambda / 4 film (8), these components Has a structure attached in turn.

Here, the reflective electrode 2 has a surface irregularity shape through a lithography method or a holography method.

In such a reflective liquid crystal display device, one or two λ / 4 films 8 may be applied to a 90 ° TN cell in order to obtain a good display screen.

However, in the conventional reflective liquid crystal display device, the use of two λ / 4 films to reduce the reflectance is caused to optimize the cell design, while when using one λ / 4 film, the λ over a wide range of visible light wavelengths There is a problem in that display characteristics are not good because a function of giving a phase difference of / 4 cannot be performed properly.

In addition, the conventional reflective liquid crystal display device has a low cell gap, and thus has a problem in that yield is lowered in the actual process.

Accordingly, an object of the present invention is to provide a liquid crystal display device having a high contrast ratio, good color characteristics, and improved process margin of a cell gap.

In order to achieve the above object, the liquid crystal display device according to the present invention is a vertical substrate having a lower substrate provided with a reflective electrode, and a pretilt angle of any one of 80 to 90 degrees and 2 degrees or less disposed on the lower substrate. Between the alignment layer, the upper substrate disposed opposite the lower substrate, the horizontal alignment layer disposed on the upper substrate and having a pretilt angle of 2 ° or less and 80 to 90 ° as opposed to the pretilt angle of the vertical alignment layer; A HAN mode liquid crystal layer interposed at and converting the phase of transmitted light depending on whether an electric field is applied, a phase film having a λ / 4 phase compensation function arranged on the outer surface of the upper substrate and converting linearly polarized light into circularly polarized light, and a phase film A polarizer disposed on and converting natural light incident from the outside into linearly polarized light,

The phase delay value (dΔn) of the HAN mode liquid crystal layer is 0.36 to 0.40 µm,

The transmission axis of a polarizing plate is 42-48 degrees,

The optical axis of retardation film is 167-173 degrees,

The alignment angle of the vertical alignment layer is -40 to -50 ° with respect to the horizontal line,

The alignment angle of the horizontal alignment layer is 40 to 50 ° with respect to the horizontal line.

The HAN mode liquid crystal layer is composed of twisted nematic liquid crystals having a twist angle of 90 °, and the phase compensation delay value of the phase film is 140 to 150 nm.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a lower substrate having a reflective electrode and a reflective electrode on the lower substrate, and dividing a unit pixel into a first region and a second region, wherein the first region is vertically or horizontally processed. The second region may include a lower alignment layer that is horizontally or vertically aligned with respect to the first region, an upper substrate disposed opposite to the lower substrate, and an upper region disposed on the upper substrate and opposite to the lower alignment layer with the first region being horizontally or vertically aligned. The second region is an upper alignment layer that is vertically or horizontally aligned as opposed to the first region, a liquid crystal layer in a twisted HAN mode interposed between both substrates, and converts a phase of transmitted light depending on whether an electric field is applied, and an outer surface of the upper substrate. A phase film having a λ / 4 phase compensation function arranged on the phase film to convert linearly polarized light into circularly polarized light, and a natural light incident on the phase film and linearly polarized It comprises a polarizer for converting a, and

The vertical or horizontal alignment treatment is modified to have a pretilt angle of 2 ° or less and 80 to 90 °.

The phase delay value (dΔn) of the twisted HAN mode liquid crystal layer is 0.36 to 0.40 µm,

The transmission axis of the polarizing plate is 42 to 48 °, the optical axis of the retardation film is 167 to 173 °,

The alignment angle of the lower alignment layer is -40 to -50 ° with respect to the horizontal line.

The alignment angle of the upper alignment layer is 40 to 50 ° with respect to the horizontal line.

The twisted HAN mode liquid crystal layer is composed of twisted nematic liquid crystals having a twist angle of 90 °, and a phase compensation delay value of the phase film is 140 to 150 nm.

The liquid crystal display according to the present invention is divided into a reflection region and a transmission region, and the reflection region is disposed on a lower substrate including a reflection electrode, and a lower substrate including the reflection electrode, and the reflection region is vertically or horizontally oriented and the transmission region is A lower alignment layer that is horizontally or vertically aligned opposite to the reflective region, an upper substrate disposed opposite the lower substrate, and disposed on the upper substrate and opposite to the lower alignment layer, the reflective region is horizontally or vertically aligned, and the transmissive region is opposite to the reflective region. The upper alignment layer which is vertically or horizontally aligned, a twisted HAN mode liquid crystal layer interposed in the reflective region between the two substrates, a TN mode liquid crystal layer interposed in the transmission region between the two substrates, and an outer surface of the upper substrate. And a phase film having a λ / 4 phase compensation function for converting linearly polarized light into circularly polarized light, and disposed on the phase film and absorbing natural light incident from the outside. A polarizing plate for converting into linearly polarized light,

The vertical or horizontal alignment treatment is modified to have a pretilt angle of any one of 2 degrees or less and 80 to 90 degrees.

The phase delay value (dΔn) of the twisted HAN mode liquid crystal layer and the TN mode liquid crystal layer is 0.36 to 0.40 µm,

The transmission axis of the polarizing plate is 42 to 48 °, the optical axis of the retardation film is 167 to 173 °,

The alignment angle of the upper alignment layer is -40 to -50 ° with respect to the horizontal line,

The alignment angle of the lower alignment layer is 40 to 50 ° with respect to the horizontal line.

The twisted HAN mode liquid crystal layer and the TN mode liquid crystal layer are made of twisted nematic liquid crystals having a twist angle of 90 °, and the phase compensation delay value of the phase film is 140 to 150 nm.

(Example)

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

The present invention comprises a λ / 4 film composed of one uniaxial film of an upper layer, and constitutes a liquid crystal display device such as two layers of optical structure (birefringence, optical axis angle), phase delay value of the liquid crystal layer, and alignment angle of the liquid crystal alignment film. By optimizing the parameters, bright and high contrast ratios, good color characteristics, high reflectivity and improved cell gap process margins.

2 is a cross-sectional view schematically showing a HAN mode liquid crystal display device according to the present invention.

In the HAN mode liquid crystal display according to the present invention, as shown in FIG. 2, a lower substrate 20 having a reflective electrode (not shown) and a lower substrate 20 are disposed on the lower substrate 20, and the pretilt angle is 80 to 80. A 90 degree vertical alignment film 21, an upper substrate 22 disposed opposite the lower substrate 20, a horizontal alignment film 23 disposed on the upper substrate 22 and having a pretilt angle of 2 degrees or less, Interposed between the substrates 20 and 22 and arranged on the outer surface of the upper substrate 22 and the liquid crystal layer 24 of the HAN mode for converting the phase of transmitted light according to the application of the electric field, and converts the linearly polarized light into circularly polarized light. And a polarizing plate 26 arranged on the phase film 25 and converting natural light incident from the outside into linearly polarized light.

The liquid crystal display according to the present invention having the above configuration achieves an optimal cell configuration capable of realizing a good display screen by combining the changed parameter values of each component while changing the parameters of the components different from the conventional ones.

Here, the thicknesses and refractive indices of the upper and lower substrates 20 and 22 are about 0.4 to 0.7t and 1.5, respectively, and the relative electrode thicknesses and the refractive indices of the upper substrate 22 are about 1500 Å and 1.7, and The thickness and refractive index of the alignment layer are about 750 Å and 1.6, and the thickness of the AlNd reflective electrode is fixed at about 1500 Å.

In addition, the upper and lower alignment layers use a polyamic acid-based material in consideration of affinity with the liquid crystal and adhesion of the substrate in order to align the liquid crystal molecules more effectively.

Meanwhile, one sheet of the phase film 25 is used, and uniaxially stretches a polymer film such as polycarbonate, polyolefin, polyvinylalcohol, or polystyrene to have a specific phase difference. .

Parameters for constituting the optimum cell are the transmission axis angle of the polarizing plate, the phase delay value of the liquid crystal layer and the alignment angle of the alignment film, and the like. The present invention relates to the transmission axis angle of the polarizing plate, the phase delay value of the liquid crystal layer and the alignment film. Optical experiments were performed using the orientation angle of as a variable, and the characteristic values of the components that can form an optimal cell are as follows.

The HAN mode liquid crystal layer 24 is composed of twisted nematic liquid crystals having a twist angle of 90 °, the phase delay value (dΔn) of the liquid crystal layer is 0.36 to 0.40 μm, and the transmission axis of the polarizing plate 26 is 42 to 48. And the optical axis of the retardation film has 167-173 degrees.

In addition, the alignment angle of the vertical alignment layer 21 is -40 to -50 ° with respect to the horizontal line, and the alignment angle of the horizontal alignment layer 23 has 40 to 50 ° with respect to the horizontal line. The phase compensation delay value is 140 to 150 nm.

3 is a graph showing the reflectance relationship according to the cell gap, it can be seen that the optimum cell gap is 5.6㎛.

4 and 6 are diagrams showing the arrangement of the axes of the components in the twisted HAN mode liquid crystal display according to the present invention. In FIG. 4, reference numeral a denotes an optical axis of a phase film, and reference numeral b denotes an upper substrate. A rubbing axis, reference numeral c denotes a rubbing axis of the lower substrate, and reference numeral d denotes a transmission axis of the polarizing plate, respectively.

6, reference numeral e denotes the rubbing axis of the upper substrate, reference numeral f denotes the rubbing axis of the lower substrate, reference numeral g denotes the transmission axis of the polarizing plate, and reference numeral h denotes the optical axis of the phase film, respectively.

5 and 7 are graphs for describing reflectance characteristics according to voltages in FIGS. 4 and 6, respectively.

As shown in FIG. 4, when the twist angle is 90 °, when the pretilt angle of the horizontal alignment layer is 0.2 °, and the pretilt angle of the vertical alignment layer is 80 ° to 90 °, the birefringence of the phase film is 147 nm, and The transmission axis angle is 170 degrees. In this case, reflectance characteristics according to voltage are shown in FIG. 5.

On the contrary, as shown in FIG. 6, when the twist angle is 90 °, when the pretilt angle of the vertical alignment film is 0.2 ° and the pretilt angle of the horizontal alignment film is 80 to 90 °, the birefringence of the phase film is 147 nm. The transmission axis angle of the polarizing plate is 10 degrees. In this case, reflectance characteristics according to voltage are shown in FIG. 7.

8 is a cross-sectional view illustrating a liquid crystal display device of a multi-domain twist HAN mode according to the present invention.

In the liquid crystal display of the multi-domain twist HAN mode according to the present invention, as shown in FIG. 8, the lower substrate 30 having the reflective electrode 31 and the reflective electrode 31 on the lower substrate 30 are provided. A lower alignment layer disposed on a surface, divided into unit regions, divided into a first region (and a second region), the first region being vertically or horizontally aligned, and the second region being horizontally or vertically aligned opposite to the first region; And the upper substrate 33 disposed opposite to the lower substrate 30, the upper region 33 disposed on the upper substrate 33, and the first region is horizontally or vertically aligned and the second region is disposed opposite to the lower alignment layer 32. In contrast to the first region, the liquid crystal layer 37 in the twisted HAN mode interposed between the upper alignment layer 36 that is vertically or horizontally aligned and the two substrates 30 and 33 and converts the phase of transmitted light depending on whether an electric field is applied thereto. In Fig. 8, reference numeral 34 denotes a color filter. Will.

Although not shown in the drawing, a phase film having a λ / 4 phase compensation function for converting linearly polarized light into circularly polarized light is disposed on the outer surface of the upper substrate, and a polarizing plate for converting natural light incident from the outside into linearly polarized light is disposed on the phase film. do.

In addition, the vertical or horizontal alignment treatment in the upper and lower alignment layers 36 and 32 is modified to have a predetermined pretilt angle, and the pretilt angle is in the range of 2 ° or less and 80 to 90 °.

On the other hand, the twisted HAN mode liquid crystal layer 37 is made of twisted nematic liquid crystal having a twist angle of 90 °, the phase delay value (dΔn) is 0.36 ~ 0.40㎛, the transmission axis of the polarizing plate is 42 ~ 48 °, The optical axis of the retardation film is 167-173 °, the alignment angle of the lower alignment film is -40 to -50 ° with respect to the horizontal line, and the alignment angle of the upper alignment film has 40 to 50 ° with respect to the horizontal line. And the phase compensation delay value of the retardation film has a 140 ~ 150nm.

9 is a cross-sectional view illustrating a transflective liquid crystal display device in which a twisted HAN & TN mode is mixed according to the present invention, and simultaneously implements two liquid crystal modes, a so-called twisted HAN mode and a TN mode, in the liquid crystal layer.

As shown in FIG. 9, the transflective liquid crystal display having a mixed HAN & TN mode according to the present invention is divided into a reflection area and a transmission area, and the lower substrate 40 having the reflection electrode 41 in the reflection area. And a lower alignment layer 42 disposed on the lower substrate including the reflective electrode 41, the reflective region being vertically or horizontally aligned, and the transmissive region being horizontally or vertically aligned opposite to the reflective region. The opposite upper substrate 43 and the upper substrate 43 are disposed on the upper substrate 43, and the reflective region is horizontally or vertically oriented as opposed to the lower alignment layer 42, and the transmissive region is vertically or horizontally oriented as opposed to the reflective region. Twisted HAN mode liquid crystal layer 47 interposed in the reflective region between the upper alignment layer 46 and the positive substrates 40 and 43 and the TN mode interposed in the transmission region between the positive substrates 40 and 43. The liquid crystal layer 48 is comprised. In FIG. 9, reference numeral 44 denotes a color filter.

In this case, in addition to the above structure, although not shown in the drawing, a phase film having a λ / 4 phase compensation function is disposed on the outer surface of the upper substrate, and a polarizing plate is attached to the phase film. The phase compensation delay value of the phase film is 140 to 150 nm.

In addition, the vertical or horizontal alignment process is modified to have a predetermined pretilt angle, and the pretilt angle is 2 degrees or less or 80 to 90 degrees.

Meanwhile, the twisted HAN mode liquid crystal layer 47 and the TN mode liquid crystal layer 48 are made of twisted nematic liquid crystals having a twist angle of 90 °, and a phase delay value dΔn is 0.36 to 0.40 μm. The transmission axis is 42 to 48 degrees, and the optical axis of the retardation film is 167 to 173 degrees. In addition, the alignment angle of the upper alignment layer 46 is -40 to -50 ° with respect to the horizontal line, and the alignment angle of the lower alignment layer 42 has 40 to 50 ° with respect to the horizontal line.

As shown in FIG. 9, when the thickness of the liquid crystal layer of the reflection area is set to (d), the cell gap d × 2 is designed in the transmission area so that both the reflection area and the transmission area have the same phase delay value dΔn.

In addition, when using the same refractive index (Δn) of the liquid crystal, the distance between the counter electrode of the transmission region is 4.8㎛ to form a transmission region for driving the TN mode, the distance between the reflective electrode and the counter electrode in the reflection region has a 5.6㎛ A reflective region for driving in the twisted HAN mode is formed, wherein the absorption axes of the polarizers are arranged in the same manner. In addition, the cell gap may be controlled by giving a concave or convex step to the upper substrate or the lower substrate.

As described above, the present invention can improve the contrast ratio and color characteristics by optimizing the design of the liquid crystal cell, thereby increasing the reflectance according to the voltage, and therefore, it is possible to provide an excellent display screen liquid crystal display device.

In addition, the present invention can increase the process margin by increasing the cell gap than that of the conventional, thereby improving the productivity.

In addition, this invention can be implemented in various changes within the range which does not deviate from the summary.

Claims (9)

A lower substrate provided with a reflective electrode, A vertical alignment film disposed on the lower substrate and having a pretilt angle of any one of 80 ° to 90 ° and 2 ° or less; An upper substrate disposed opposite the lower substrate; A horizontal alignment film disposed on the upper substrate and having a pretilt angle of 2 ° or less and 80 to 90 °, as opposed to the pretilt angle of the vertical alignment film, An HAN mode liquid crystal layer interposed between the two substrates and converting a phase of transmitted light according to whether an electric field is applied; A phase film having a λ / 4 phase compensation function disposed on an outer surface of the upper substrate and converting linearly polarized light into circularly polarized light; Is disposed on the phase film, and comprises a polarizing plate for converting the natural light incident from the outside into linearly polarized light, The phase delay value dΔn of the HAN mode liquid crystal layer is 0.36 to 0.40 μm, The transmission axis of the said polarizing plate is 42-48 degrees, The optical axis of the retardation film is 167-173 ° The angle of alignment of the vertical alignment layer is -40 to -50 ° with respect to the horizontal line, And the alignment angle of the horizontal alignment layer is 40 to 50 ° with respect to the horizontal line. The liquid crystal display of claim 1, wherein the HAN mode liquid crystal layer is formed of twisted nematic liquid crystals having a twist angle of 90 degrees. The liquid crystal display device according to claim 1, wherein the phase compensation delay value of the phase film is 140 to 150 nm. A lower substrate provided with a reflective electrode, Disposed on the reflective electrode surface on the lower substrate, the unit pixel is divided into two regions, the first region and the second region, and the first region is vertically or horizontally oriented, and the second region is horizontally opposite to the first region A lower alignment layer subjected to vertical alignment; An upper substrate disposed opposite the lower substrate; An upper alignment layer disposed on the upper substrate, wherein the first region is horizontally or vertically aligned with the lower alignment layer, and the second region is vertically or horizontally aligned with respect to the first region; A liquid crystal layer in a twisted HAN mode interposed between the two substrates and converting a phase of transmitted light according to whether an electric field is applied; A phase film having a λ / 4 phase compensation function disposed on an outer surface of the upper substrate and converting linearly polarized light into circularly polarized light; Is disposed on the phase film, and includes a polarizing plate for converting the natural light incident from the outside into linearly polarized light, The vertical or horizontal alignment treatment is modified to have a pretilt angle of any one of 2 ° or less and 80 to 90 °, The phase delay value (dΔn) of the twisted HAN mode liquid crystal layer is 0.36 to 0.40 µm, The transmission axis of the said polarizing plate is 42-48 degrees, The optical axis of the retardation film is 167-173 °, The alignment angle of the lower alignment layer is -40 to -50 ° with respect to the horizontal line, And an alignment angle of the upper alignment layer is 40 to 50 ° with respect to the horizontal line. The liquid crystal display device according to claim 4, wherein the twisted HAN mode liquid crystal layer is made of twisted nematic liquid crystals having a twist angle of 90 degrees. 5. The liquid crystal display device according to claim 4, wherein the phase compensation delay value of the phase film is 140 to 150 nm. A lower substrate which is divided into a reflection area and a transmission area, the reflection area having a reflection electrode; A lower alignment layer disposed on a lower substrate including the reflective electrode, wherein the reflective region is vertically or horizontally aligned, and the transmissive region is horizontally or vertically aligned opposite to the reflective region; An upper substrate disposed opposite the lower substrate; An upper alignment layer disposed on the upper substrate and opposite to the lower alignment layer, wherein the reflective region is horizontally or vertically aligned; A twisted HAN mode liquid crystal layer interposed in the reflection region between the two substrates; A TN mode liquid crystal layer interposed in the transmission region between the two substrates; A phase film having a λ / 4 phase compensation function disposed on an outer surface of the upper substrate and converting linearly polarized light into circularly polarized light; Is disposed on the phase film, and comprises a polarizing plate for converting the natural light incident from the outside into linearly polarized light, The vertical or horizontal alignment treatment is modified to have a pretilt angle of any one of 2 degrees or less and 80 to 90 degrees. The phase delay value (dΔn) of the twisted HAN mode liquid crystal layer and the TN mode liquid crystal layer is 0.36 to 0.40 µm, The transmission axis of the said polarizing plate is 42-48 degrees, The optical axis of the retardation film is 167-173 ° The alignment angle of the upper alignment layer is -40 to -50 ° with respect to the horizontal line, And an alignment angle of the lower alignment layer is 40 to 50 ° with respect to the horizontal line. 8. The liquid crystal display device according to claim 7, wherein the twisted HAN mode liquid crystal layer and the TN mode liquid crystal layer are made of twisted nematic liquid crystals having a twist angle of 90 degrees. 8. The liquid crystal display device according to claim 7, wherein the phase compensation delay value of the phase film is 140 to 150 nm.

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