JP2000214452A - Reflection type liquid crystal display device and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make obtainable a bright display with high diffusion reflectance and good visibility in a reflection type liquid crystal display device equipped with a reflector having a group of reflective electrodes on one of a pair of substrates, by controlling the diffusion reflectance of the reflector defined by a specified formula to be in a specified range. SOLUTION: This display device is equipped with a reflector having a group of reflective electrodes 7 on one of a pair of substrates 3a, 3b, and the group of reflective electrodes 7 have diffusion reflection property. When the reflection luminance Bdr of the reflector is measured by integration of condensed light after most of the regular reflection component is removed under diffusion illumination and the reflection luminance Bdo of a standard white board is measured by integration of condensed light after most of the regular reflection component is removed under diffusion illumination, the diffusion reflectance Rdr of the reflector defined by the formula of Rdr=Bdr/Bdo×100 is specified to 55 to 70. By specifying the diffusion reflectance Rdr of the single reflection plate to 55<=Rdr<=70, a bright display with high diffusion reflectance and good visibility can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reflection type liquid crystal display device.

[0002]

2. Description of the Related Art In recent years, portable telephones, PHSs or PDAs
2. Description of the Related Art With the rapid spread of information communication devices such as (portable information terminals), an environment where anyone can easily access information and transmit information regardless of location or time is being prepared.

[0003] Since the portability of these information communication devices is important, the devices constituting the display unit are thin,
Light and low power are required. At present, a liquid crystal display device is generally used as a device constituting the display unit, and among them, a reflection type liquid crystal display device which does not require a backlight is mainly used.

Conventional reflective color liquid crystal display devices include a type having two polarizing plates so as to sandwich a liquid crystal cell having a color filter, and a type having only one polarizing plate disposed on the upper surface of a liquid crystal cell. There are two types. The color filter is
It is provided on one of a pair of substrates constituting the liquid crystal cell, and a transparent electrode is further formed thereon. By applying a voltage to the liquid crystal cell to change the alignment state of the liquid crystal molecules, the light transmittance of each color filter is changed to perform color display.

In any of the above two types of conventional reflection type liquid crystal display devices, it is necessary to consider a reduction in the reflectance of incident light in view of the configuration. To obtain a brighter display, the reflection plate must be bright. That is, it is necessary to enhance the diffuse reflectance of the reflector alone.

[0006] The closer the diffuse reflection luminance B _{dr of the} reflector alone to the reflection luminance B _d0 of the standard white plate, the more the diffuse reflectance R _dr
And the display becomes brighter. The diffuse reflectance R _dr increases as the diffuse reflectivity increases. As a matter of course,
R _{dr of the} metal reflecting plate having a mirror surface is almost zero. Therefore, _Rdr was measured for various reflectors, and the diffuse reflectivity was visually confirmed. For the measurement, a spectrophotometer CM-508d manufactured by Minolta Co., Ltd. was used. As a result, it was found that as R _dr increased, the scattering property became better, and an appearance close to that of paper was obtained.

[0007]

As described above, a promising method for increasing the diffuse reflectance of a liquid crystal display device is to increase the diffuse reflectance _Rdr of the reflector alone. However, when such a reflection plate having a strong diffuse reflection property is bonded to the liquid crystal layer, when light incident on the liquid crystal layer is reflected by the reflection plate and emitted, the intensity of the emitted light is significantly reduced, and the diffusion of the liquid crystal display device is reduced. There is a problem that the reflectance _Rte is low and the display becomes very dark.

The diffuse reflectance R _te of the liquid crystal display device is obtained in the same manner as R _dr by calculating the reflection luminance of the liquid crystal display device obtained by substantially removing the regular reflection component and condensing and integrating under diffuse illumination, in the same manner as B _te . When the reflection luminance of the standard white plate is B _t0 ,

[0009]

## _EQU3 ## It is defined that R _te = B _te / B _t0 × 100.

For example, when the diffuse reflectance R _{dr of the} reflector alone is 9
When the transmittance of the polarizing plate is assumed to be 45% and the transmittance of the color filter is assumed to be 65% when the transmittance is 0.2%, the diffuse reflectance R _te of the liquid crystal display device is 21.6% in theory. On the other hand, the measured value was remarkably reduced to 7.76%, and the display was very dark.

The present invention has been made in order to solve the above problems.
It is an object of the present invention to provide a reflection type liquid crystal display device which has a high diffuse reflection factor _Rte of the liquid crystal display device and can perform a bright display with good visibility by adjusting the diffuse reflectance _Rdr of the reflection plate.

[0012]

In order to achieve the above object, a reflection type liquid crystal display device according to the present invention is directed to a reflection type liquid crystal display device having a reflection plate having a reflection electrode group on one of a pair of substrates. The reflective electrode group has a diffuse reflectivity, the reflection luminance of the reflector measured by light collection and integration after roughly removing the regular reflection component under diffuse illumination is B _dr , and the regular reflection component under diffuse illumination is roughly described. When the reflection luminance of the standard white plate measured by removing and condensing integration is defined as B _d0 ,

[0013]

## EQU4 ## The diffuse reflectance R _{dr of the} reflector defined by R _dr = B _dr / B _d0 × 100 is about 55 to
70.

The diffuse reflectance R of the reflector_drEquipped with a reflector
Diffuse reflectance R of reflective liquid crystal display device _teIs shown in Figure 3.
Thus, the diffuse reflectance R of the reflector_drIs in the range of about 55-70
At some point, it shows the highest value. Therefore, the above configuration
According to the description, the diffuse reflectance R of the liquid crystal display device_teHigh visibility
To provide a reflective liquid crystal display device that can display images with good brightness
can do.

In the above-mentioned reflection type liquid crystal display device, it is preferable that an uneven structure having diffusivity is formed on the surface of the reflection electrode group.

According to this configuration, a brighter display can be obtained as a reflection type liquid crystal display device.

In the above-mentioned reflection type liquid crystal display device, it is preferable that the planar shape of the concave-convex structure is substantially circular and the cross-sectional shape is a curved surface.

According to this configuration, the diffuse reflectivity is improved, and a brighter display can be obtained.

The number of the concave portions of the concave-convex structure is about 10 to 400 in one pixel, and the concave portion has a depth of about 0.1 μm.
m-1 μm, and the diameter of the concave portion is preferably about 3 μm-12 μm.

Alternatively, the number of protrusions of the uneven structure is about 10 to 400 in one pixel, and the height of the protrusions is about 0.
1 μm to 1 μm, and the diameter of the projection is about 3 μm to 12 μm.
m is preferable.

Further, in the above-mentioned reflection type liquid crystal display device, it is preferable that the reflection electrode group is formed of any one of aluminum, an aluminum alloy, and silver.

According to this configuration, since these metals have a high reflectance, a brighter display can be obtained.

Further, the thickness of the reflective electrode group is about 10
It is preferably in the range of 0 nm to 300 nm.

According to this configuration, a brighter display can be obtained.

In the above-mentioned reflection type liquid crystal display device, the substrate having the reflection electrode group in the pair of substrates is a thin film transistor arranged in a matrix, and an interlayer insulating film provided between the thin film transistor and the reflection electrode group. Having the reflective electrode group and the thin film transistor,
Preferably, the connection is made via a contact hole formed in the interlayer insulating film.

According to this structure, it is possible to provide a reflective liquid crystal display device capable of high-speed driving using a thin film transistor and having a small parasitic capacitance due to the provision of the interlayer insulating film, and capable of high quality display. .

In the reflection type liquid crystal display device, it is preferable that a retardation plate and a polarizing plate are arranged outside one of the pair of substrates.

According to another aspect of the present invention, there is provided a method of manufacturing a reflection type liquid crystal display device, comprising: providing a reflection plate having a diffuse reflection property on one of a pair of substrates; a schematic removed to B _dr reflection brightness of the reflecting plate as measured by the condenser integration, the reflection brightness of a standard white plate as determined by the specular reflection components outlined remove condenser integrated under diffuse illumination and B _d0 When

[0029]

The diffuse reflectance R _{dr of the} reflector defined by R _dr = B _dr / B _d0 × 100 is about 55 to
70. The method of manufacturing a reflective liquid crystal display device according to item 70, wherein the step of forming the reflector includes forming a photosensitive resin film, and forming an uneven structure on the surface of the photosensitive resin film. Irradiating light using a photomask to form a concavo-convex structure on the surface; curving a cross-sectional shape of the concavo-convex structure; forming a metal film on the surface of the photosensitive resin film And performing the steps of:

According to this method, it is possible to provide a reflection-type liquid crystal display device which has a high diffuse reflectance _Rte of the liquid crystal display device and can perform a bright display with good visibility.

In the method of manufacturing a reflective liquid crystal display device, the photosensitive resin contains an acrylic resin, and the step of curving a cross-sectional shape of the concave-convex structure includes:
It is preferable to heat the photosensitive resin film using a heating jig heated to a temperature in a range of about 110 ° C to 120 ° C.

According to this method, it is possible to provide a reflection type liquid crystal display device in which the cross-sectional shape of the concave-convex structure can be formed into a desired curved surface shape, the diffuse reflectance is further increased, and a bright display is possible.

In the method for manufacturing a reflection type liquid crystal display device, the step of forming the cross-sectional shape of the concave-convex structure into a curved surface, wherein the photosensitive resin contains an acrylic resin,
About 1 J / cm ^{2 to 2} J / c on the surface of the photosensitive resin film.
Irradiation with ultraviolet light having an intensity in the range of m ² is preferred.

According to this method, it is possible to provide a reflection type liquid crystal display device in which the cross-sectional shape of the concave-convex structure can be formed into a desired curved surface shape, the diffuse reflectance is further increased, and a bright display can be performed.

[0035]

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a schematic configuration of the reflection type liquid crystal display device of the present embodiment. As shown in FIG. 1, this reflection type liquid crystal display device includes a polarizing plate 1 that polarizes external light in one direction and a retardation plate 2 that changes the phase of polarized light on one surface of a liquid crystal cell 10. Are stacked.

The liquid crystal cell 10 includes a pair of glass substrates 3a.
3b. On one side of the glass substrate 3a, red, green,
A blue color filter 4 is provided, and a transparent electrode 5 is provided on the surface of the color filter 4. The reflection electrode 7 is provided on one surface of the glass substrate 3b. An alignment film (not shown) is laminated on each surface of the transparent electrode 5 and the reflection electrode 7, and a liquid crystal is sealed between these alignment films to form a liquid crystal layer 6.

The present reflection type liquid crystal display device performs display by modulating the light incident from the polarizing plate 1 side with the liquid crystal layer 6 and reflecting the light on the surface of the reflection electrode 7. That is, the observer
The present reflection type liquid crystal display device is viewed from the polarizing plate 1 side.

The reflective electrode 7 has a plurality of concave and convex structures in one pixel, and has the number of concave portions (or the number of convex portions) S in one pixel.
In the range of 10 or more and 400 or less, and the depth L of the concave portion (or the height of the convex portion) is in the range of 0.1 μm ≦ L ≦ 1 μm. Further, the diameter r of the concave portion is 3 μm ≦ r ≦ 12
The range was μm. When the diffuse reflectance R _dr of the single reflective electrode 7 having this configuration was measured, it was found that it was in the range of 10 ≦ R _dr ≦ 97. In addition, 150 of the above S,
When L is 0.8 μm and r is 6 μm, the diffuse reflectance R _dr of the reflection electrode 7 alone can be within the range of 55 to 70.

The reflective electrode 7 was formed using a highly reflective metal such as aluminum, an aluminum alloy, or silver. Further, the film thickness is set to 100 nm or more and 300 n
m, the reflectivity is further increased,
A bright reflective electrode was obtained.

[0041] Here, as comparative experiment, instead of the reflective electrode 7 in the above reflective liquid crystal display device, using a variety of diffuse reflector having different diffuse reflectance R _dr, diffuse reflector single diffuse reflectance R _dr and the diffuse reflectance R _{te of the} reflective liquid crystal display device
FIG. 3 shows the results of the measurement of the relationship with. For the measurement, a spectrophotometer CM-508d manufactured by Minolta Co., Ltd. was used.

As can be seen from FIG. 3, as the diffuse reflectance R _dr of the diffuse reflector alone increases to around 55%, the diffuse reflectance R _{te of the} reflective liquid crystal display device also shows an increasing tendency. The diffuse reflectance R _dr of the diffuse reflector alone is 55 to 70
%, The peak reached 70% or more, and the value of the diffuse reflectance _Rte of the reflective liquid crystal display device rapidly decreased.

The reason will be described with reference to FIG. FIG.
FIG. 3 is a schematic diagram showing the principle of reduction in reflected light intensity.

In order to observe the reflection type liquid crystal display device in a state where the light is sufficiently bright and easy to see, the reflection type liquid crystal display device is usually observed from a direction having a certain angle with respect to the incident principal ray direction. It is configured to be. Generally, this angle is said to be about 30 °.

The light that has passed through the liquid crystal layer and reached the surface of the diffuse reflection plate is largely reflected in an observation direction other than the regular reflection direction, unlike the case of the mirror reflection plate. In other words, a high diffuse reflectance means that when incident light is reflected on the surface of the diffuse reflection plate, the opening angle of the emitted light increases.

In FIG. 4, a diffuse reflection plate (reflection electrode 7)
Is assumed to be θ1, the emission angle from the liquid crystal layer 6 is θ2, the refractive index n _LC of the liquid crystal layer 6 is n _LC = 1.5, and the refractive index n _air of _air is n _air = 1.0. By the law of

[0047]

There is a relational expression of n _LC · SIN θ1 = n _air · SIN θ2. When 0 ° ≦ θ2 ≦ θ1, the incident light is reflected from the diffuse reflection plate (reflection electrode 7) and emitted from the liquid crystal layer 6. Will come. However, when θ1 ≦ θ2 ≦ 90 °,
Light reflected from the diffuse reflection plate (reflection electrode 7) cannot be emitted from the liquid crystal layer 6 due to total reflection. The decrease in _Rte with the increase in the reflectance _Rdr of the diffuse reflection plate (reflection electrode 7) can be explained as described above.

Next, embodiments of the present invention will be described more specifically.

FIG. 2 is an enlarged view of a pixel portion of the reflection type liquid crystal display device shown in FIG.

As a material for the glass substrate 3a, non-alkali glass was used, and on the glass substrate 3a, color filters 4 on a red, green, and blue stripe made of a pigment-dispersed resist were formed. Then, a transparent electrode 5 was formed by forming a film of indium tin oxide (hereinafter, referred to as ITO) on the color filter 4.

Next, a gate electrode 11 made of aluminum and tantalum was formed on the surface of the glass substrate 3b using non-alkali glass by a predetermined method. Further, an interlayer insulating film 12 made of silicon nitride is formed so as to cover the gate electrode 11, and a source electrode 13 and a drain electrode 14 made of titanium and aluminum are arranged in a matrix on the surface of the interlayer insulating film 12, Gate electrode 1
A TFT element 15 made of amorphous silicon was formed at each intersection between the first electrode 1 and the source electrode 12.

Next, an inorganic interlayer insulating film 1 made of silicon nitride is formed on the glass substrate 3a on which the TFT element 15 is formed.
6, a contact hole 17 was formed on the drain electrode 14 by irradiating ultraviolet rays using a photoresist and a predetermined photomask, and then etching the silicon nitride by dry etching. The inorganic interlayer insulating film 16 functions not only as an interlayer insulating film of the TFT element 15 but also as an electrode protection film in a driver mounting portion.

The photosensitive acrylic resin (for example, J) is formed on the entire surface of the glass substrate 3a on which the interlayer insulating film 16 is formed.
An organic interlayer insulating film 18 having a film thickness of about 3 μm is formed by applying a resin 302 (manufactured by SR Co., Ltd.), and then ultraviolet irradiation is performed using a photomask provided with a pattern for forming a concavo-convex structure. Performed at an intensity in the range of １００100 mJ / cm ² .

Next, development was performed for a certain period of time using an organic alkali. At this time, holes (concave portions) were formed on the interlayer insulating film 18 corresponding to the pattern of the photomask. This hole has a substantially circular planar shape and an inverted trapezoidal cross-sectional shape.

Next, on the entire surface of the interlayer insulating film 18 to form a hole, after the irradiation of ultraviolet rays at an intensity in the range of ^{1J / cm 2 ~2J / cm 2} , on a hot plate maintained at a temperature of about 110 ° C. And cured by heating for about 5 minutes to form a concavo-convex structure having a substantially circular planar shape and a curved cross-sectional shape.

When the temperature of the hot plate is 100 ° C. or lower, the interlayer insulating film 18 does not melt, and the cross-sectional shape of the concave portion remains unchanged after development, which is not preferable. Conversely, when the temperature of the hot plate was 130 ° C. or higher, melting of the interlayer insulating film 18 occurred rapidly, and the concave structure almost disappeared. Hot plate temperature is 110 ℃
In the range of 120 ° C., the cross-sectional shape of the concave portion became a desired curved shape. That is, the temperature of the hot plate is 110 ° C.
It is preferable that it is in the range of -120 ° C.

In the case where ultraviolet rays are not irradiated before heating, if the temperature of the hot plate becomes 110 ° C. or higher, the interlayer insulating film 18 is rapidly melted, and a temperature at which a desired curved surface shape can be obtained. The range was extremely narrow, and the shape of the concave portion in the plane became non-uniform. From this, it has been found that by irradiating a certain amount or more of ultraviolet rays, the melting property of the interlayer insulating film 18 can be suppressed and the temperature range in which a desired curved surface shape can be obtained can be expanded. Thereafter, the photosensitive acrylic resin of the interlayer insulating film 18 was cross-linked by performing a heat treatment in a clean oven at about 200 ° C.

Next, aluminum was formed on the surface of the interlayer insulating film 18 and irradiated with ultraviolet rays using a photoresist and a predetermined photomask, and then the reflection electrode 7 was formed using a phosphoric acid-based etching solution.

On the surfaces of the transparent electrode 5 and the reflective electrode 7,
A polyamic acid solution having a solid concentration of 5% by weight (SE-7211 manufactured by Nissan Chemical Industry Co., Ltd.) was printed at about 220 ° C.
Then, an alignment process (not shown) made of polyimide is formed by performing a rotation rubbing process using a rayon cloth so as to obtain a TN (twisted nematic) orientation. did.

Next, at the periphery of the glass substrate 3a on which the color filter 4 and the transparent electrode 5 are formed as described above,
A thermosetting sealing material (not shown) is printed and formed by providing a liquid crystal inlet. In addition, as this sealing material, for example, Struct Bond manufactured by Mitsui Toatsu Chemicals, Inc. can be used.

The surface of the alignment film (not shown) on the glass substrate 3b side on which the reflective electrode 7 and the like are formed, has a diameter of about 3 μm.
m of a spherical spacer made of plastic
After dispersing at a rate of 200 pieces / mm ² , the glass substrate 3
a, and the sealing material was cured at 150 ° C.

Next, a liquid crystal layer 6 is formed by vacuum-injecting a liquid crystal in which a chiral composition is added to a fluorine-based nematic liquid crystal composition having a refractive index anisotropy of 0.09. The liquid crystal cell was completed by closing the entrance.

An active matrix type reflection type liquid crystal display device was manufactured by attaching a quarter-wave plate as a retardation plate 2 and a polarizing plate 1 to a counter substrate of the liquid crystal cell formed as described above. .

The reflection type liquid crystal table produced by the above steps
FIG. 2 shows the result of the measurement of the reflectance using the display device.
It is shown. For example, the diffuse reflectance R of the reflective electrode 7
_drIs 31.5%, the diffuse reflection of the reflective liquid crystal display device
Rate R_teWas 8.03%, whereas R_drIs 60.5
%, The diffuse reflectance R of the liquid crystal display device_teIs 16.3%
High reflectance can be obtained, and the diffusion
Emissivity R_drIs 55 ≦ R _drWhen ≦ 70, R_te
Is 15 ≦ R_te≦ 17, extremely bright and low viewing angle dependence
No reflective liquid crystal display device was obtained.

When the active matrix type reflection type liquid crystal display device of this embodiment was driven and the panel reflectance under a diffused light source was measured, the reflectance was 1.1% in the black state and 1.1% in the white state. 16.3%, and a favorable panel reflection characteristic with high reflectance was realized. In addition, no coloration due to interference was observed, and an achromatic black-and-white display was realized.

In this embodiment, the reflection type liquid crystal display device of the single-polarizer type, which requires a color filter and a polarizer, has been exemplified. However, the present invention is not limited to this, and does not use a polarizer. The same effect can be obtained even when implemented as a reflection-type liquid crystal display device of a guest-host type, a polymer dispersed liquid crystal type, or a laminated type not using a color filter.

[0067]

As described above, the diffuse reflectance R _dr of the reflector alone is calculated as follows.

[0068]

By defining the range of 55 ≦ R _dr ≦ 70, the diffuse reflectance R of the liquid crystal display device is obtained.
_It is possible to provide a reflective liquid crystal display device having high _te , good visibility, and capable of bright display.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a schematic configuration of a reflective liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view illustrating a configuration of a pixel portion of the reflective liquid crystal display device.

FIG. 3 is a graph showing the relationship between the diffuse reflectance R _{dr of the} reflector alone of the reflective liquid crystal display device and the diffuse reflectance R _te of the entire liquid crystal display device.

FIG. 4 is an explanatory view showing the principle of reducing the diffuse reflectance R _te of the reflection type liquid crystal display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 polarizing plate 2 retardation plate 3 a / 3 b glass substrate 4 color filter 5 transparent electrode 6 liquid crystal layer 7 reflective electrode 10 liquid crystal cell 11 gate electrode 12/16/18 interlayer insulating film 13 source electrode 14 drain electrode 15 TFT element 17 contact hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisanori Yamaguchi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Tetsu Ogawa 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. CC09 DD13 EE33 FF03 FF05 GG12 HH02 KK05

Claims (12)

[Claims] 1. A reflective electrode group is provided on one of a pair of substrates.
In a reflection type liquid crystal display device provided with a reflection plate, the reflection electrode group has a diffuse reflection property, and
Before specular reflection component is roughly removed by
The reflection luminance of the reflection plate is B_dr, Specular reflection under diffuse lighting
Standard white plate measured by light-converging integration after roughly removing components
The reflection brightness of B _d0Where: R_dr= B_dr/ B_d0The diffuse reflectance R of the reflector defined by × 100_drBut about 55
70. A reflective liquid crystal display device characterized by being in the range of 70.
Place. 2. The reflection type liquid crystal display device according to claim 1, wherein an uneven structure having a diffusivity is formed on a surface of the reflection electrode group. 3. The reflection type liquid crystal display device according to claim 2, wherein a plane shape of the concave-convex structure is substantially circular and a cross-sectional shape is a curved surface. 4. The number of recesses of the uneven structure is about 10 to 400 in one pixel, and the depth of the recess is about 0.1 μm to
3. The reflection type liquid crystal display device according to claim 2, wherein the diameter is 1 μm and the diameter of the concave portion is about 3 μm to 12 μm. 5. The number of projections of the uneven structure is about 10 to 400 in one pixel, and the height of the projections is about 0.1 μm to
3. The reflection type liquid crystal display device according to claim 2, wherein the diameter is 1 [mu] m and the diameter of the projection is about 3 [mu] m to 12 [mu] m. 6. The reflection type liquid crystal display device according to claim 1, wherein the reflection electrode group is formed of any one of aluminum, an alloy of aluminum, and silver. 7. The reflective electrode group has a thickness of about 100 nm.
7. The reflection type liquid crystal display device according to claim 6, wherein the range is from about 300 nm to about 300 nm. 8. A substrate having a reflective electrode group among the pair of substrates, the thin film transistor having: a thin film transistor arranged in a matrix; and an interlayer insulating film provided between the thin film transistor and the reflective electrode group. The reflective liquid crystal display device according to claim 1, wherein the electrode group and the thin film transistor are connected via a contact hole formed in the interlayer insulating film. 9. The reflection type liquid crystal display device according to claim 1, wherein a retardation plate and a polarizing plate are arranged outside one of the pair of substrates. 10. A reflection plate having a diffuse reflection property is provided on one of a pair of substrates, and a reflection luminance of the reflection plate measured by condensing integration after removing a regular reflection component under diffuse illumination is represented by B _dr , _Assuming that the reflection luminance of the standard white plate measured by condensing integration after removing the regular reflection component under illumination is B _d0 , the reflection defined by the following equation: R _dr = B _dr / B _d0 × 100 The diffuse reflectance R _{dr of the} plate is about 55
70. The method of manufacturing a reflective liquid crystal display device according to 70, wherein the step of forming the reflector includes: forming a photosensitive resin film; and forming an uneven structure on a surface of the photosensitive resin film. Irradiating light using a photomask to form a concavo-convex structure on the surface; curving a cross-sectional shape of the concavo-convex structure; forming a metal film on the surface of the photosensitive resin film A method of manufacturing a reflective liquid crystal display device. 11. The method according to claim 11, wherein the photosensitive resin includes an acrylic resin, and in the step of curving a cross-sectional shape of the concavo-convex structure, using a heating jig heated to a temperature in a range of about 110 ° C. to 120 ° C. 2. A method for heating a conductive resin film.
0. The method for manufacturing a reflective liquid crystal display device according to item 0. 12. The photosensitive resin contains an acrylic resin.
In the step of curving the cross-sectional shape of the uneven structure,
About 1 J / cm on the surface of the photosensitive resin film. ^Two~ 2
J / cm^Two11. Irradiation with ultraviolet light having an intensity within the range described above.
3. The method for manufacturing a reflective liquid crystal display device according to item 1.