JPH11231807A - Reflective liquid crystal display - Google Patents

Abstract

(57) [Problem] To improve the alignment of a reflection type liquid crystal display device and make the viewing angle characteristics uniform. A panel (1) is a transparent first substrate (1) located on the incident side of external light, a second substrate (2) joined to the first substrate (1) via a predetermined gap and located on the reflection side, and a gap between the two substrates. And nematic liquid crystal 3 twisted and aligned, and electrodes 10 and 11 formed on both substrates and applying a voltage to nematic liquid crystal 3 for each pixel 30. When no voltage is applied, the nematic liquid crystal 3 functions as a quarter-wave layer while maintaining the twist alignment, and cooperates with the polarizing plate 20 and the quarter-wave plate 9 to pass external light to display white. Do. When a voltage is applied, the nematic liquid crystal 3 shifts to the vertical alignment and loses the function as a quarter-wave layer, and cooperates with the polarizing plate 20 and the quarter-wave plate 9 to block external light and to turn black. Display. Each pixel 30 is divided into two regions 30A and 30B, and the orientation direction of the nematic liquid crystal 3 belonging to one region 30A and the orientation direction of the nematic liquid crystal belonging to the other region 30B are approximately 45 ° or 135 °. Has made.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type liquid crystal display device which performs display using external light such as natural light. More specifically, the present invention relates to a split alignment technique for improving the viewing angle dependence of a reflection type liquid crystal display device.

[0002]

2. Description of the Related Art A liquid crystal display device using a liquid crystal as an electro-optical material has a flat panel shape, and is characterized by being light and thin and having low power consumption. For this reason, it is actively developed as a display of a portable device. The liquid crystal is not of a self-luminous type and selectively transmits and blocks external light to form an image. As described above, the passive type liquid crystal display device is classified into a transmission type and a reflection type according to an illumination method. In a transmissive liquid crystal display device, a panel in which liquid crystal is held between a pair of transparent substrates is formed, and a backlight is arranged on the back surface, while an image is observed from the front of the panel. In the case of the transmission type, a backlight is indispensable and, for example, a cold cathode tube or the like is used. Since the backlight consumes most of the power when viewed as a whole display, it is not suitable for a display of a portable device. On the other hand, in the reflection type, an external light such as natural light is incident from the front while a reflection plate is arranged on the back surface of the panel, and the reflected light is used to observe an image from the front. Unlike the transmissive type, which does not use a backlight, the reflective type requires relatively low power consumption and is suitable for a display of a portable device.

[0003]

Incidentally, in the liquid crystal display device, the liquid crystal has a birefringent property and the alignment is appropriately controlled in accordance with various operation modes. In this connection, the liquid crystal display device has a viewing angle dependency, and there is a problem that the display contrast changes depending on the direction in which the observer observes the screen. As shown in FIG. 6, the viewing angle of the observer is represented by the declination φ and the inclination θ. In the figure, the angle of deviation φ is set counterclockwise with respect to the orientation direction of the liquid crystal of panel 0. The inclination angle θ is represented by the inclination with respect to the normal line of the panel 0.

Generally, a so-called twisted nematic (TN) mode liquid crystal panel is frequently used in a transmission type liquid crystal display device. FIG. 7 shows the viewing angle dependence of a transmissive TN mode liquid crystal panel. FIG. 7 is an iso-contrast curve in which points at which the contrast is equal are plotted on a graph having a declination φ in the circumferential direction and an inclination θ in the radial direction. As is clear from the graph, the transmission type TN mode has a remarkable visual angle dependency, and the contrast greatly changes depending on the direction in which the observer observes the screen. Conventionally, techniques for improving the viewing angle dependency have been actively developed, and for example, an orientation division technique is considered promising. In this technique, each pixel is divided into a plurality of regions by a matrix type liquid crystal display device or the like, and the orientation direction is changed for each region to suppress the viewing angle dependency. In this orientation division method, an actual area division method or an orientation method is designed in consideration of the viewing angle dependency shown in FIG.

On the other hand, in a reflection type liquid crystal display device, TN-E
The CB mode is considered promising in terms of display contrast. The TN-ECB mode is a method that basically uses the retardation of the liquid crystal.
N mode is added. The reflective TN-ECB mode also has viewing angle dependence, but has different viewing angle characteristics from the transmissive TN mode. Therefore, in order to improve the viewing angle dependence of the reflection type liquid crystal display device, it is a problem to be solved to establish a reflection type unique orientation division technique.

[0006]

The following means have been taken in order to solve the above-mentioned problems of the prior art. That is, the reflection type liquid crystal display device according to the present invention includes a panel, a polarizing plate, and a quarter-wave plate as a basic configuration. The panel includes a transparent first substrate positioned on the incident side of external light, a second substrate bonded to the first substrate via a predetermined gap and positioned on the reflection side, and a nematic held in the gap and twist-oriented. A liquid crystal; and an electrode formed on the first substrate and the second substrate for applying a voltage to the nematic liquid crystal for each pixel. A polarizing plate and a quarter wave plate are provided on the first substrate. When no voltage is applied, the nematic liquid crystal functions as a quarter-wave layer while maintaining twisted alignment,
In cooperation with the polarizing plate and the quarter-wave plate, white light is displayed by passing external light. When a voltage is applied, the nematic liquid crystal shifts to vertical alignment, loses its function as a quarter-wave layer, and blocks external light in cooperation with the polarizing plate and the quarter-wave plate. Perform black display. As a feature, each pixel is divided into two regions, and the orientation direction of the nematic liquid crystal belonging to one region and the orientation direction of the nematic liquid crystal belonging to the other region make an angle of approximately 45 ° or 135 °.

[0007] In one embodiment, each pixel is rectangular and divided into two regions along its diagonal. In yet another embodiment, each pixel is rectangular and divided into two regions along its center line. Preferably, the nematic liquid crystal is 60 ° from the first substrate side toward the second substrate side.
The orientation direction is twisted in the range of 70 to 70 °. Preferably, the polarizing plate has a polarization axis parallel or orthogonal to the alignment direction of the nematic liquid crystal belonging to one region on the first substrate side, and the polarization direction of the nematic liquid crystal belonging to the other region on the first substrate side.
Make an angle of 5 ° or 135 °.

In the reflection type liquid crystal display device according to the present invention, when no voltage is applied, the nematic liquid crystal functions as a quarter wavelength layer while maintaining the twist alignment, and when the voltage is applied, the nematic liquid crystal shifts to the vertical alignment. Loses its function as a quarter-wave layer. That is, the reflection type liquid crystal display device according to the present invention employs the TN-ECB mode. And
In cooperation with the polarizing plate and the quarter-wave plate when no voltage is applied, white light is displayed by passing outside light, and black display is performed by blocking the outside light when voltage is applied. That is, it is a normally white mode. In a reflection type liquid crystal display device of a TN-ECB type and a normally white mode, a viewing angle is widened in a direction parallel or perpendicular to a liquid crystal alignment direction on a first substrate side facing an observer, and a direction shifted by 45 ° from the viewing angle is widened. Is characterized by a narrow viewing angle. Therefore, in the present invention, a display having a wide viewing angle in all directions can be obtained by dividing each pixel into two and shifting the alignment directions by 45 ° or 135 ° from each other.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing an embodiment of the reflection type liquid crystal display device according to the present invention.
As shown, the reflective liquid crystal display device includes a panel 0, a quarter-wave plate 9 and a polarizing plate 20 as a basic configuration. The panel 0 has a first substrate 1 made of transparent glass or the like located on the incident side of external light, and a second substrate 2 located on the reflection side joined to the first substrate 1 via a predetermined gap. A nematic liquid crystal 3 is held in a gap between the two substrates 1 and 2. The liquid crystal molecules 3a are twist-aligned by the upper and lower alignment films 6,7. Electrodes 10 and 11 are formed on the inner surfaces of the substrates 1 and 2, respectively, and a voltage is applied to the nematic liquid crystal 3 for each pixel. In this embodiment, the electrodes 10 formed on the first substrate 1 are patterned in a stripe shape, and the electrodes 11 formed on the second substrate 2 are also formed in a stripe shape. The electrodes 10 and 11 are orthogonal to each other, and a pixel 30 is defined at the intersection.
It is a so-called simple matrix type. However, the present invention is not limited to this, and includes a reflection type liquid crystal display device employing an active matrix system. In the case of the active matrix type, a counter electrode is formed on the entire surface of the first substrate 1, and a pixel electrode is formed on the second substrate 2. Each pixel electrode is driven by a switching element such as a thin film transistor. Polarizing plate 20 and quarter-wave plate 9
Are disposed on the first substrate 1 side of the panel 0. The reflection type liquid crystal display device having such a configuration is of the TN-ECB type and is in a normally white mode. That is, when no voltage is applied, the nematic liquid crystal 3 functions as a quarter-wave layer while maintaining the twist alignment, and cooperates with the polarizing plate 20 and the quarter-wave plate 9 to pass external light. Perform white display. When a voltage is applied, the nematic liquid crystal 3 shifts to the vertical alignment and loses the function as a quarter-wave layer, and cooperates with the polarizing plate 20 and the quarter-wave plate 9 to block external light and to turn black. Display. As a feature, each pixel 30 is divided into two regions. The orientation direction of the nematic liquid crystal 3 belonging to one region 30A and the orientation direction of the nematic liquid crystal 3 belonging to the other region 30B make an angle of approximately 45 ° or 135 °.

Next, each component will be described in detail with reference to FIG. As described above, the first substrate 1 of the panel 0
Is provided with a polarizing plate 20 on the surface of. A quarter-wave plate 9 is interposed between the polarizing plate 20 and the first substrate 1. The quarter-wave plate 9 is made of, for example, a uniaxially stretched polymer film, and gives a phase difference of a quarter wavelength between ordinary light and extraordinary light. The optical axis (one-axis anisotropic axis) of the quarter-wave plate 9 is arranged at an angle of 45 ° with the polarization axis (transmission axis) of the polarizing plate 20. External light becomes linearly polarized light when transmitted through the polarizing plate 20. When this linearly polarized light passes through the quarter-wave plate 9, it becomes circularly polarized light. Once again, it passes through a quarter-wave plate and becomes linearly polarized. In this case, the polarization direction is rotated by 90 ° from the original polarization direction. As described above, the quarter-wave plate can rotate the polarization direction by being combined with the polarizing plate, and this is used for display.

The panel 0 basically uses a nematic liquid crystal 3 composed of horizontally oriented nematic liquid crystal molecules 3a having a positive dielectric anisotropy as an electro-optical material. The nematic liquid crystal 3 functions as a quarter-wave layer by appropriately setting its thickness. In the present embodiment, the refractive index anisotropy Δn of the nematic liquid crystal 3 is about 0.7, and the thickness of the nematic liquid crystal 3 is about 3 μm. Therefore, the retardation Δn · d of the nematic liquid crystal 3 is 0.2
To 0.25 μm. As shown in the drawing, by twist-aligning the nematic liquid crystal 3, the above-described retardation value becomes substantially about 0.15 μm (150 nm). This value is the center wavelength of external light (about 600 nm)
And the nematic liquid crystal 3 can optically function as a quarter-wave layer. By sandwiching the nematic liquid crystal 3 between the upper and lower alignment films 6 and 7, a desired twist alignment can be obtained. On the first substrate 1 side, the liquid crystal molecules 3a are aligned along the rubbing direction of the alignment film 6, and on the second substrate 2 side, the liquid crystal molecules 3a are aligned along the rubbing direction of the alignment film 7. By shifting the rubbing directions of the alignment films 6 and 7 by 60 ° to 70 °, a desired twist alignment can be obtained.

A light reflecting layer 8 is formed below the electrode 11 on the second substrate 2 side. The light reflection layer 8 has irregularities on the surface and has light scattering properties. Accordingly, not only is the paper white appearance preferable as a display background, but also the incident light is reflected in a relatively wide angle range, so that the viewing angle is enlarged, the display is easy to see, and the brightness of the display is increased in a wide viewing angle range. A transparent flattening layer 12 for filling irregularities is interposed between the light reflecting layer 8 and the electrode 11. The light reflecting layer 8 is composed of a resin film 15 having unevenness and a metal film 16 such as aluminum formed on the surface thereof. The resin film 15 is a photosensitive resin film having irregularities patterned by photolithography. The photosensitive resin film 15 is made of, for example, a photoresist and is applied to the entire surface of the substrate. This is exposed through a predetermined mask, and is patterned into, for example, a cylindrical shape. Then, by heating and performing reflow, the uneven shape can be formed stably. A metal film 16 made of aluminum or the like having a desired film thickness and good light reflectivity is formed on the surface of the concavo-convex shape thus formed. Several μm depth of unevenness
, Good light scattering characteristics can be obtained and the light reflecting layer 8
Has a white color. A flattening layer 12 is formed on the surface of the light reflecting layer 8 to fill the irregularities. The flattening layer 12 is preferably made of a transparent organic material such as an acrylic resin. By interposing the planarizing layer 12, the electrode 11 and the alignment film 7 can be formed stably.

FIG. 2 is a schematic diagram showing a specific example of orientation division. Each of them shows an example of split orientation on the second substrate side. The first substrate side is subjected to orientation division processing so that the liquid crystal is oriented at a twist angle set to 60 ° to 70 ° in each region when the first substrate side is overlapped with the second substrate side shown in the drawing. In the example shown in (1), the pixel 30 is divided into two by the vertical center line 30V. The orientation direction of the other region 30B forms an angle of 45 ° with the orientation direction of the one region 30A.
Such a split orientation can be realized by combining photolithography and rubbing. Specifically, first, an alignment film such as polyimide is applied over the entire surface of the electrode formed on the lower substrate. Next, the right side region 30B is masked with a photoresist for each pixel 30, and the left side region 30A is masked.
Only expose. A desired orientation can be obtained by rubbing the exposed region 30A in the direction indicated by the arrow.
Next, while masking the oriented region 30A with a photoresist, the region 30B that has been masked so far is exposed.
By rubbing the region 30B in the direction indicated by the arrow, a desired alignment treatment can be obtained. Finally, the photoresist remaining in the region 30A may be stripped and removed. Instead of the rubbing method described above, the divided orientation can be realized by selective irradiation of polarized ultraviolet light. Specifically, after applying a photopolymerizable alignment film to each pixel 30, one region 3
Polarized ultraviolet rays are selectively irradiated only to 0A to polymerize the alignment film. At this time, polymerization anisotropy occurs along the polarization direction, and a desired alignment ability is obtained. Orientation direction is area 30A
What is necessary is just to set the polarization direction of ultraviolet rays so that it may become the direction shown by the arrow. After the alignment processing of the region 30A is completed, the alignment processing of the region 30B is performed using polarized ultraviolet rays. In this case, the polarization direction of the ultraviolet light used for the alignment treatment of the region 30B is inclined by 45 ° with respect to the polarization direction of the ultraviolet light used for the alignment treatment of the region 30A.

In the orientation division example shown in (2), the pixel 30 is also divided into two by the vertical center line 30V. The orientation direction of the other region 30B forms an angle of 135 ° with the orientation direction of the one region 30A. In the example shown in (3), the pixel 30 is vertically divided into two parts by a horizontal center line 30H. Orientation direction of region 30A and region 30B
Has an angle of 45 °. In the example of (4), the pixel 30 is divided into two by a diagonal line 30T. Similarly, the orientation direction of the region 30A and the orientation direction of the region 30B make an angle of 45 °.

The operation of the reflective display device shown in FIG. 1 will be described in detail with reference to FIG. In the figure, (OFF) indicates a voltage non-applied state, and (ON) indicates a voltage applied state. As shown in (OFF), the reflective liquid crystal display device has a polarizing plate 20, a quarter-wave plate 9,
A nematic liquid crystal 3 and a light reflection layer 8 are stacked.
In the figure, only one pixel 30 is cut out and is divided into two regions 30A and 30B. The polarization axis (transmission axis) of the polarizing plate 20 is represented by 20P. The optical axis 9S of the quarter wave plate 9 makes an angle of 45 ° with the transmission axis 20P. In each pixel 30, the orientation direction of one region 30A and the orientation direction of the other region 30B form an angle of 45 °. Focusing on the region 30A, the liquid crystal molecules 3a on the first substrate side
Is the polarization axis (transmission axis) 20 of the polarizing plate 20.
Parallel to P. Focusing on the region 30B, the orientation direction 30R of the liquid crystal molecules 3a on the first substrate side forms an angle of 45 ° with the transmission axis 20P.

When the incident light 101 passes through the polarizing plate 20, it becomes a linearly polarized light 102. The polarization direction is parallel to the transmission axis 20P, and is hereinafter referred to as parallel linear polarization. When the parallel linearly polarized light 102 passes through the quarter-wave plate 9, it becomes circularly polarized light 1.
03 is converted. The circularly polarized light 103 becomes linearly polarized light when passing through the nematic liquid crystal 3 functioning as a quarter wavelength layer. However, the polarization direction of the linearly polarized light is rotated by 90 ° and is orthogonal to the parallel linearly polarized light 102. Hereinafter, this is referred to as orthogonal linearly polarized light. The orthogonal linearly polarized light is reflected by the light reflection layer 8 and then passes through the nematic liquid crystal 3 functioning as a quarter-wave layer again, so that it becomes circularly polarized light 104. Circularly polarized light 1
04 further passes through the quarter-wave plate 9 to become the original parallel linearly polarized light 105. The parallel linearly polarized light 105 passes through the polarizing plate 20 to become the outgoing light 106, and reaches the observer, so that a white display is obtained. As described above, one region 3 of the pixels 30
Although the external light passing through 0A has been described, the other area 3
The same applies to external light passing through 0B.

In the voltage applied state shown in (ON), the liquid crystal molecules 3a shift from the twist alignment to the vertical alignment in both of the regions 30A and 30B, and the function as a quarter-wave layer is lost. External light 101 that has passed through the polarizing plate 20 becomes parallel linearly polarized light 102. The parallel linearly polarized light 102 becomes circularly polarized light 103 when passing through the quarter-wave plate 9. After passing through the nematic liquid crystal 3 as circularly polarized light, the circularly polarized light 103 is reflected by the light reflection layer 8 and reaches the quarter-wave plate 9 as circularly polarized light 104a. Here, the circularly polarized light 104a is converted into orthogonal linearly polarized light 105a. Since the orthogonal linearly polarized light 105a cannot pass through the polarizing plate 20, a black display is obtained. that's all,
Although the description is for one area 30A, black display can be obtained in the same manner for the other area 30B.

FIG. 4 is a graph showing the viewing angle characteristics of the area 30A when no voltage is applied (white display) shown in FIG. 3 (OFF). This graph shows an equal contrast curve similarly to the graph shown in FIG. The orientation direction 30R of the region 30A is declination φ = 0, and the declination φ is set counterclockwise along the circumferential direction. The inclination angle θ is in increments of 10 ° along the radial direction from 10 ° to 60 °. Out of the six curve groups, the outermost curve C5 represents an isocontrast curve with a contrast of 5, and the innermost curve C30 represents an isocontrast curve with a contrast of 30.
As is clear from the graph, φ = 0 °, 90 °, 180
The viewing angle is wide in the directions of ° and 270 °, while the viewing angle is narrow in the directions of the declination φ of 45 °, 135 °, 225 ° and 315 °. On the other hand, the viewing angle characteristics of the other region 30B shown in (OFF) of FIG. 3 are exactly the same as those of FIG. However, the orientation 30R of the region 30B is the same as that of the region 30B.
Since the position is shifted by 45 ° counterclockwise with respect to the orientation direction 30R of A, the position of φ = 0 in the graph of FIG.
It will rotate counterclockwise. That is, the region 30B is provided to compensate for a decrease in the contrast of the region 30A in the oblique 45 ° direction, and forms a region in which the pixels 30 are divided and the entire alignment of the liquid crystal 30 is shifted by 45 °. in this way,
The region 30B in which the orientation direction is shifted by 45 ° compensates for the oblique contrast of the region 30A, and realizes a flat viewing angle characteristic in all directions. In general, in the case of a normally white mode using a quarter-wave plate, the polarization axis of the polarizing plate may be parallel to the orientation direction of the first substrate, or may be in the 45 ° or 135 ° direction. Almost the same display characteristics and viewing angle characteristics can be obtained. Therefore, when performing the orientation division according to the present invention, the polarization axis of the polarizing plate may be set to be parallel or perpendicular to the orientation direction on the first substrate side of one of the divided regions. The optical axis of the quarter-wave plate may be inserted at an angle of 45 ° with respect to the polarization axis of the polarizing plate.

FIG. 5 is a graph showing the viewing angle characteristics of the contrast of the reflective liquid crystal display device when the alignment is divided according to the present invention. As is apparent from the figure, the viewing angle dependency in the oblique direction is greatly improved, and a uniform contrast characteristic can be obtained in almost all directions. In the case of the normally white mode, the viewing angle characteristics having substantially the same profile can be obtained even if the orientation direction on the first substrate side is parallel to the polarization axis of the polarizing plate or is inclined by 45 °. Therefore, by combining the two, a uniform contrast can be obtained in almost all directions as shown in FIG. Incidentally, in the case of the normally black mode, the case where the polarization axis of the polarizing plate is parallel or perpendicular to the alignment direction on the first substrate side is 45 ° or 135 °.
The display characteristics are significantly different from the case where the display is tilted. Therefore, the viewing angle characteristics cannot be made uniform only by simply providing the divided regions in which the alignment directions are shifted from each other by 45 ° as in the normally white mode.

[0020]

As described above, according to the present invention,
In a TN-ECB type normally white mode reflective liquid crystal display device, each pixel is divided into two regions, and the alignment direction of the nematic liquid crystal belonging to one region and the alignment direction of the nematic liquid crystal belonging to the other region are determined. Almost 45
By shifting by an angle of 135 ° or 135 °, the viewing angle dependency is improved, and a uniform contrast can be obtained in almost all directions. In particular, since the contrast becomes uniform in all directions regardless of the direction of the polarizing axis of the polarizing plate, the direction of the polarizing axis of the polarizing plate can be selected independently of the contrast. For example, it becomes possible to set the polarization axis of the polarizing plate in the most advantageous direction in terms of manufacturing cost. For the same reason, sunglass measures can be effectively taken. The measure against sunglasses means a measure against a phenomenon that display becomes difficult to see due to the relationship with the polarization axis of the polarizing plate on the display device when the display device is observed while wearing sunglasses with a polarizing plate. The measure against sunglasses is performed by adjusting the polarization axis of the polarizing plate on the display device side. In the case of the present invention, the viewing angle characteristics are uniform in all directions irrespective of the polarization axis. Therefore, the polarization axis of the polarizing plate can be appropriately set for sunglass measures without considering the viewing angle characteristics.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a reflection type liquid crystal display device according to the present invention.

FIG. 2 is a schematic diagram showing an example of area division adopted in a reflection type liquid crystal display device according to the present invention.

FIG. 3 is a schematic view for explaining the operation of the reflective liquid crystal display device shown in FIG. 1;

FIG. 4 is a reference diagram showing viewing angle characteristics of a reflection type liquid crystal display device.

FIG. 5 is a graph showing viewing angle characteristics of the reflective liquid crystal display device according to the present invention shown in FIG.

FIG. 6 is a schematic diagram showing a viewing angle with respect to the display device.

FIG. 7 is a graph showing viewing angle characteristics of a conventional transmission type liquid crystal display device.

[Explanation of symbols]

0 ... panel, 1 ... first substrate, 2 ... second substrate, 3 ... nematic liquid crystal, 6 ... alignment film, 7 ...
..Alignment film, 8 ... Light reflecting layer, 9 ... Quarter wave plate, 10 ... Electrode, 11 ... Electrode, 12 ... Smoothing layer, 20 ... Polarizing plate , 30 ... pixel, 30A ...
.Area, 30B ... Area

Claims (5)

[Claims] 1. A transparent first substrate located on an incident side of external light, a second substrate joined to the first substrate via a predetermined gap and located on a reflection side, and held in the gap and twist-oriented. A nematic liquid crystal, a panel formed on the first substrate and the second substrate and provided with an electrode for applying a voltage to the nematic liquid crystal for each pixel, a polarizing plate provided on the first substrate, and a quarter wavelength When no voltage is applied, the nematic liquid crystal functions as a quarter-wave layer while maintaining twisted alignment, and transmits external light in cooperation with the polarizing plate and the quarter-wave plate. When a voltage is applied, the nematic liquid crystal shifts to vertical alignment and loses its function as a quarter-wave layer, and cooperates with the polarizing plate and the quarter-wave plate to form a white display. The light is blocked and black display is performed. Each pixel is divided into two areas. And the orientation direction of the nematic liquid crystal belonging to one region and the orientation direction of the nematic liquid crystal belonging to the other region are approximately 45 ° or 135 °.
A reflective liquid crystal display device characterized by an angle of °. 2. The method according to claim 1, wherein each pixel is rectangular and divided into two regions along a diagonal line thereof.
The reflective liquid crystal display device according to the above. 3. The method according to claim 1, wherein each pixel is rectangular and divided into two regions along a center line thereof.
The reflective liquid crystal display device according to the above. 4. The liquid crystal display device according to claim 1, wherein the nematic liquid crystal has a twist alignment in which the alignment direction is twisted within a range of 60 ° to 70 ° from the first substrate side to the second substrate side. Reflective liquid crystal display. 5. The polarizing plate according to claim 1, wherein a polarization axis of the polarizing plate is parallel or perpendicular to an alignment direction of the nematic liquid crystal belonging to one region on the first substrate side, and is aligned with an alignment direction of the nematic liquid crystal belonging to the other region on the first substrate side. 45 ° or 135 °
5. The reflection type liquid crystal display device according to claim 4, wherein the angle of the reflection type liquid crystal display is set.