JP2003315786A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflection type liquid crystal display wherein contrast is heightened and excellent display quality is attained by eliminating back-scattering and adopting a structure wherein optical compensation is easily performed. <P>SOLUTION: A reflection film 14, a color filter 13, an overcoat layer 12, a transparent electrode 11 and an alignment layer 10 are successively formed on a substrate 15, a transparent electrode 7, an alignment layer 8 are formed on a substrate 6 and a first retardation film 5, a second retardation film 4 and a polarizing plate 3 are successively formed on the outer surface of the substrate 6. A projection array group 2 is formed on the principal surface on the display surface side of the polarizing plate 3 and a reflection preventing film 1 is applied on the projection arranged group 2. The substrates 6 and 15 are stuck to each other by using a sealing member via a liquid crystal layer 9. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention
The present invention relates to a reflective liquid crystal display device having
You. 2. Description of the Related Art A conventional reflection type liquid crystal display device is shown in FIGS.
0 is shown. FIG. 8 shows a reflection type liquid crystal display device using a forward scattering plate.
FIG. 9 is a schematic cross-sectional view of the arrangement, and FIG.
Parts, and a scattering reflector consisting of a reflective film
FIG. 2 is a schematic sectional view of a reflection type liquid crystal display device used. Also,
FIG. 10 is a schematic cross-sectional view of still another reflection type liquid crystal display device.
It is. [0003] In the liquid crystal display device shown in FIG.
A light reflective transparent film made of a metal film
A plurality of bright electrodes 27 are arranged.
An alignment film 8 made of an imide resin or the like is applied and formed. On the other substrate 6 made of glass or the like,
A color filter 13 is formed.
An overcoat layer 12 made of glass or the like is coated thereon.
Transparent on the overcoat layer 12
A plurality of electrodes 11 are arranged, and
An alignment film 10 made of a mid resin or the like is applied and formed. Further, on the other substrate 6, the forward scattering plate 2
6, the first retardation film 5, the second retardation film 4,
The light plate 3 is sequentially formed. This forward scattering plate 26 is transparent.
Bright microparticles are solidified with a transparent polymerizable polymer.
See Heihei 8-201802). In the liquid crystal display device shown in FIG.
Is formed by arranging a plurality of protrusions made of a resin on the substrate 15.
Forming the array 29, and forming an Al.
A reflection film 28 made of Ag or the like is formed, and thus a scattering reflection plate is formed.
Then, a color filter 13 is formed thereon, and
Overcoat made of glass or the like on the color filter 13
Layer 12 is coated on the overcoat layer 12 with ITO.
A plurality of transparent electrodes 11 composed of
11 is coated with an alignment film 10 made of polyimide resin or the like.
Cloth is formed. A transparent electrode made of ITO or the like is placed on the substrate 6.
A plurality of poles 7 are arranged, and a polyimide resin
An alignment film 8 made of fat or the like is applied and formed. Further base
The first retardation film 5 and the second retardation film are provided on the outer surface of the plate 6.
The film 4 and the polarizing plate 3 are sequentially formed. [0008] Then, for the liquid crystal display device having the above configuration,
Further, as shown in FIG. 10, display is performed using ambient light.
For this purpose, a rough polarizing plate 30 is provided with minute irregularities,
A structure in which the surface reflection is reduced as much as possible by the polarizing plate 30.
And then coating a low refractive index layer on these irregularities
There has also been proposed a configuration in which an anti-reflection film is formed by using the method described in
7-333404). [0009] The reflection type liquid crystal display device having the various configurations as described above.
According to the arrangement, by providing a forward scattering plate and a scattering reflection plate,
Incident light is scattered in directions other than the specular reflection direction, thereby displaying
Increases visibility. [0010] However, FIG.
In the liquid crystal display device using the forward scattering plate shown
Scattering could be reduced, but completely eliminated
This is structurally impossible, so that incident light is
Backscattered before reaching the crystalline layer, resulting in contra
This reduces the strike and reduces the visibility. Further, a liquid crystal using a scattering reflector shown in FIG.
In a display device, this backscattering does not occur, but on the other hand,
The incident light is scattered by the scattering reflector, and the incident light and the reflected light are reflected.
Between the two, there is a difference in the distance through the device,
The polarization state is no longer symmetric between time and reflection,
There is a problem that optical compensation is difficult. In addition, in the liquid crystal display device having this configuration,
Is to display using ambient light,
Surface reflection must be as small as possible,
As shown in FIG. 10, the surface of the anti-glare polarizing plate is formed into minute irregularities.
Rough or even coat a low refractive index layer on this uneven surface
There has been proposed a configuration in which an anti-reflection film is formed by
You. However, in the liquid crystal display device having this configuration,
Small irregularities are formed on the anti-glare polarizing plate surface
This has caused some light scattering. That is, the polarization plate and the internal scattering structure are opposite to each other.
By combining the projection type liquid crystal display device, the polarizing plate surface and
The light scattering function is provided at two locations on the reflective liquid crystal display.
For this reason, stable production of liquid crystal display devices with uniform performance
It was difficult to build. In view of the above circumstances, the present inventor has made intensive studies.
As a result, a plurality of resin protrusions were randomly arranged on the polarizing plate.
By forming a solid convex array group, this problem was solved.
I found that I got it. The present invention has been completed based on the above findings.
The purpose is to simplify the scattering structure and
Eliminate scattering and adopt a structure that is easy to optically compensate
To enhance contrast and achieve excellent display quality
To provide an improved liquid crystal display device. Further, another object of the present invention is to provide a polarizing plate on which
Formed a convex array group in which resin convex portions were randomly arranged
High performance and high signal
It is to provide a reliable liquid crystal display device. A liquid crystal display device according to the present invention.
Covers the light reflection film on one main surface of the substrate.
One member in which a transparent electrode and an alignment film are sequentially laminated on a film
And a transparent electrode and an alignment film sequentially laminated on a transparent substrate.
With a nematic liquid crystal interposed between
While arranging the pixels in a ricks shape,
A polarizing plate is arranged on the other main surface of the transparent substrate, and the surface of the polarizing plate is
A plurality of resin protrusions are randomly arranged on the main surface on the display side
A convex array group is formed, and an antireflection film is formed on the convex array group.
In the coated device configuration, the transparent electrode of one member
And / or multiples of the array pitch in
Or a multiple of the array pitch of the transparent electrode
Is characterized in that the convex array group is divided in accordance with. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to an STN type simple mat.
Explained by drawing with Rix's color liquid crystal display
I do. The same unit as the liquid crystal display device shown in FIGS.
Locations are given the same reference numerals. FIG. 1 is a schematic diagram of a reflection type liquid crystal display device of the present invention.
FIG. 4 is a cross-sectional view, in which the display area is a diagonal of 3.8 inches;
20 dots x 240 dots, the size of one pixel is 8
It is 0 μm × 240 μm. 6 is a glass having a polarizing plate disposed on the display surface side.
And a transparent substrate made of synthetic resin or the like.
And another substrate made of synthetic resin or the like. On the substrate 15, Al, AlCMg, AlN
d, Ag, AgPd, AgPdCu, dielectric mirror, etc.
Forming a reflection film 14 as the light reflection film made of
To a mirror surface. The color filter 13 is provided on the reflection film 14.
Is formed, and glass or acrylic is formed on the color filter 13.
Overcoat layer 12 made of
Transparent on the overcoat layer 12
A plurality of electrodes 11 are arranged, and
An alignment film 10 made of a mid resin or the like is applied and formed. The color filter 13 is of a pigment dispersion type,
That is, the feeling that was previously prepared with pigments (red, green, blue)
Apply photo-resist on the substrate and use it for photolithography
Formed. On the substrate 6 is a transparent electrode made of ITO or the like.
A plurality of poles 7 are arranged, and a polyimide resin
An alignment film 8 made of fat or the like is applied and formed. Further base
First place made of polycarbonate etc. on the outer surface of the plate 6
A second film made of a retardation film 5 and polycarbonate or the like;
A phase difference film 4 and an iodine-based polarizing plate 3 are sequentially formed.
are doing. These are made of acrylic material
Adhere by applying an adhesive. A plurality of polarizing plates 3 are provided on the main surface on the display surface side.
A convex array group 2 is formed by arranging convex parts (the bottom surface is almost circular).
Then, the anti-reflection film 1 is coated on the convex array group 2.
You. The substrates 6, 15 are, for example, 20
Chiral nematic twisted at an angle of 0-260 °
Attached by a seal member via a liquid crystal layer 9 made of
I'm matching. A large number of spacers are arranged on the liquid crystal layer 9.
The thickness is kept constant. Next, the convex array group 2 is formed on the polarizing plate 3.
This step will be described with reference to FIG. [0029] Process A : Coating resin substrate 17 on polarizing plate 3
I do. A concave mold surface 16 is prepared. As the resin substrate 17
Uses a thermosetting resin or an ultraviolet curable resin. for example
For example, there is an acrylic resin made by Hitachi Chemical, which is a thermosetting resin.
It is a mixture of a resin and an ultraviolet curable resin. When applied by spin coating, the film
It may be applied with a thickness of 3.0 ± 1.0 μm. [0031] Step B : Mold surface 16 having desired uneven shape
Prebaking for 6 while pressing the
Perform at 0 ± 10 ° C. for 2 minutes. Then, the whole surface exposure 200m
j is performed, and the concave and convex mold surface 16 is peeled from the surface of the resin base material 17
I do. As a result, the surface of the resin base 17 is
The uneven shape is formed. Further, by pre-baking and overall exposure, the resin
The surface of the substrate 17 and the uneven mold surface 16 are easily separated.
You. [0033] C process : Finally, post-bake 80 ± 1
By performing the process at 0 ° C. for 60 minutes, the uneven resin base material 17
To cure. The resin substrate 17 is made of a thermosetting resin.
If so, press the concave mold surface against the resin surface and apply heat
As a result, the resin is cured, and the unevenness is formed. In the case of an ultraviolet curable resin, a concave is formed on the resin surface.
By pressing the mold surface and irradiating ultraviolet rays,
The resin is cured to form irregularities. As described above, the polarized light passes through each of the steps A to C.
A convex array group 2 is formed on a plate 3 and the convex array group 2 is formed.
An antireflection film 1 is coated on the group 2. For reference, FIG. 4 shows an actual fabrication on a polarizing plate.
The enlarged photograph of the convex array group 2 is shown. As the antireflection film 1, a low refractive index layer MgF
_Two (N = 1.38) deposited by sputtering or evaporation
did. Normal polarizing plate (without any surface treatment
(Polarizing plate not provided) has a reflectance of 4% for incident light.
On the other hand, low refraction on conventional polarizing plates compared to polarizing plates
In the structure in which the rate layer is arranged, the reflectance is 1%. Thus, in the reflection type liquid crystal display device of this embodiment,
In addition, by providing the antireflection film 1, the backscattered light is suppressed.
This prevents contrast loss and
As a result, the display quality could be improved. Then, the antireflection film 1 is made of such a single layer.
Instead of an anti-reflection film of low refractive index layer (for example, Si
O _Two ) And a high refractive index layer (for example, TiO _Two )
Reflectivity is further reduced by coating a multilayer anti-reflective coating
Which can further enhance the display quality.
Was. In addition, TiO _Two (N = 2.5) high refraction
Rate layer (thickness 17 nm) and SiO _Two (N = 1.46)
Low refractive index layer (35 nm thick) and TiO _Two (N = 2.
5) a high refractive index layer (127 nm thick) and SiO _Two (N
= 1.46) and a low refractive index layer (thickness: 94 nm).
A four-layer structure may be used. Or Al _Two O _Three (N = 1.62) low bending
Folding layer (thickness 85 nm) and ZrO _Two (N = 2.1)
High refractive index layer (thickness 130 nm) and MgF _Two (N = 1.
38) and a low refractive index layer (thickness: 100 nm)
It may have a three-layer structure. The inventor of the present invention has proposed an ordinary polarizing plate and a low refractive index layer.
MgF _Two (N = 1.38) single-layer antireflection film is provided.
Polarizing plate and a polarizing plate with a multilayer anti-reflection coating.
Then, the wavelength dispersion of each surface reflected light was measured.
At this time, the result shown in FIG. 3 was obtained. The multilayer antireflection film is made of TiO. _Two (N = 2.5)
High refractive index layer (thickness 17 nm) and SiO _Two (N = 1.
46) low refractive index layer (35 nm thick) and TiO _Two (N
= 2.5) high refractive index layer (127 nm thick) and SiO
_Two (N = 1.46) low refractive index layer (94 nm thick)
It has a four-layer structure in which layers are sequentially stacked. As is clear from FIG. 3, a normal polarizing plate is used.
Has a 4% reflectance to incident light, but a low refractive index layer
MgF _Two (N = 1.38) with a single-layer antireflection film
In the optical plate, the reflectance is reduced only around 550 nm. Further, TiO _Two High refractive index layer and SiO _Two of
In a structure in which four layers of low refractive index layers are alternately stacked,
The reflectance is 1% or less for all wavelength bands. As described above, the convex array group 2 on the polarizing plate 3
With the scattering function, the incident light is
When the light is scattered backward without entering the crystal layer, the liquid crystal layer
Slightly backscattered light
Or the display is blurred.
There was a problem that However, as in the present invention,
By providing the antireflection film 1, backscattered light is suppressed,
This prevents a decrease in contrast and improves display quality.
Up. Thus, as in the present invention, the contrast is high.
To realize a reflective liquid crystal display with high display quality
Although a scattering structure is formed, the convex array group 2 is formed on the polarizing plate 3.
To serve as a light scattering function, and to form a convex array
Antireflection film 1 on group 2 prevents surface reflection on polarizing plate
It also plays the role of glare. In addition, as shown in FIG.
If it is a reflection type liquid crystal display device with a light plate, the light scattering function is 2
However, in the present invention, the light scattering function is provided in one place.
Aggregated. Further, the reflection film 14 is formed on the substrate 15.
And the mirror surface on the substrate allows light incident at an angle
Are polarized at the time of incidence and at the time of reflection.
This makes it easy to set the optical compensation
There is also an effect that. Next, the diameter of the convex portion of the convex array group 2 (the circular
By changing the bottom surface as many times as possible,
All evaluations were shown. The evaluation conditions are as follows: fluorescent lamps are arranged at intervals of 180 cm.
Reflective LCD display under lit office lighting
With the hand in hand and moving up, down, left and right,
The scattering property was evaluated. And as shown in Table 1
Results were obtained. In the same table, the diameter of the convex part is
It is displayed as diameter. Glitter sets four evaluation criteria,
"◎◎" means no glare at all, "◎"
Indicates that there is almost no glare, and “△” indicates
"X" indicates a place where glare is noticeable.
It is. For the scattering property, four evaluation criteria were set, and "、"
“◎” indicates a very good case, and “◎” indicates a good case.
Is slightly scattered, but the degree is small.
And “x” indicates a case where the scattering property is small. [Table 1] As is clear from the table, the convex array group 2
When the diameter of the convex portion is 50 μm or more, unevenness is visually recognized,
This can be seen as a crack,
Significantly degrades display quality. Therefore, the diameter of the convex part
Should be less than 50 μm, preferably 30 μm or less. However, the diameter of the convex portion is a numerical value less than visible light,
That is, when the diameter is reduced to 0.4 μm or less, the effective scattering
Disturbance is not obtained, so display products of reflective liquid crystal display
Significantly lowers the position. Therefore, the diameter of the convex portion is 0.
More than 4 μm, preferably 0.7 μm or more, optimal
Is preferably 0.9 μm or more. Next, the uneven shape of the polarizing plate surface is optimized.
For this purpose, as shown in FIG.
The inclination angle number distribution of the convex shape (convex part) is from 0 ° to the maximum inclination angle
The display is evaluated for objects that are constant up to θMax.
Then, the results shown in Table 2 were obtained. As a conventional example, a polarizing plate is not suitable for anti-glare properties.
The surface of the light plate is roughened, and such a polarizing plate is replaced with a specular reflector.
This shows a case where the present invention is combined with an installed reflection type liquid crystal display device. In addition, as in the present invention, fine
The unevenness is formed to form the convex array group 2, and the maximum of the convex portion of the polarizing plate
Reflective liquid crystal display device with various inclination angles θMax
Was prepared. Then, the viewing angle of the reflection type liquid crystal display device and the brightness
The relationship between Rusa was evaluated. The evaluation conditions are as follows: fluorescent lamps are arranged at 180 cm intervals.
Reflective LCD display under lit office lighting
The brightness and visibility can be obtained by moving the
An evaluation was made of the field angle. For the brightness, four evaluation criteria were set, and "
"◎" is very bright, "◎" is bright and "△" is very bright
When it becomes slightly dark, “x” indicates a dark case. The viewing angle was determined based on four evaluation criteria.
"◎" is a very wide case, "◎" is a wide case, "△"
Is a little narrow, and “x” is a narrow case. Since the amount of ambient light is constant, it is natural that
However, increase the maximum tilt angle θMax of the reflective liquid crystal display device.
The smaller the comb viewing angle, the lower the reflectance and the maximum tilt
If the oblique angle θMax is reduced and the viewing angle is reduced, the reflectance will increase.
As can be seen, viewing angle and reflectance are trade-offs.
In charge. [Table 2] As is clear from Table 2, the viewing angle and the
The range of the maximum inclination angle θMax with good balance of the emissivity is 8
° to 20 °, preferably 12 ° to 16 °
It turns out that it is good. For reference, see JP-A-7-333404.
In contrast to the proposed liquid crystal display device shown in FIG.
In the device of the above, forming fine irregularities on the polarizing plate surface,
Anti-reflection by forming a low refractive index layer on the unevenness
It is a structure with a film formed and has an excellent viewing angle.
Conventionally, the main purpose of the unevenness of the polarizing plate surface is to prevent glare.
Very low turbulence and therefore has anti-glare irregularities
Liquid crystal display device with a polarizing plate and a specular reflector
Sufficient scattering cannot be obtained even if
The display can be slightly confirmed only near the specular reflection direction.
It was. On the other hand, in the present invention, the uneven surface
By controlling the shape optimally, both brightness and viewing angle are compatible
A reflection type liquid crystal display device excellent in degree is obtained. This point will be described with reference to FIG. According to the figure, the reflection type of the present invention shown in FIG.
In a liquid crystal display device, the maximum inclination angle of the projection on the polarizing plate
Is 14 °. First, the scattering characteristics of this reflection type liquid crystal display device
The measurement method will be described with reference to FIG. The incident angle of the incident light is changed to the reflection type liquid crystal display device.
Reflective liquid crystal with a constant light receiving angle of 30 ° from the vertical direction
From the direction perpendicular to the display (0 °) to 60 °,
The scattering characteristic is measured by measuring the reflectance of the sample.
The reflectance is based on the scattered light intensity of MgO based on JIS standard.
Is standardized as 100%. As is apparent from FIG.
Conventional liquid crystal display shown in FIG. 10 proposed in Japanese Patent No. 3404
Device and the reflective liquid crystal display device of the present invention in terms of scattering characteristics.
By comparison, the present invention has a specular reflection
Wide range of ± 30 ° around 30 ° light angle
The viewing angle and brightness are maintained because
This realizes a reflective liquid crystal display device that is compatible with the above. (Pattern of Convex Array 2 of Polarizing Plate 3) Convex
The concave mold surface 16 is used for patterning the mold array group 2.
The pattern 23 is shown in FIG. FIG. 12 is a diagram.
It is a principal part enlarged view of A shown in FIG. The pattern 23 has many convex portions S of the convex array group 2.
A number of arrangements, these arrangements are in a random state
And the arrangement pitch on the transparent electrode 7 side and the transparent electrode
It is divided according to both of the arrangement pitches on the 11 side.
Thus, a group G corresponding to each pixel is obtained. As a specific example, the image display surface is 5.7 inches
If the size is explained, the bias corresponding to one display surface
Each projection S on which about 10 million projections are arranged on the light plate
The shape of is not a circle, for example, square, pentagon, hexagon
Shape, and even more polygons
A circular shape is desirable so that the scattering characteristics do not differ depending on the direction.
New Further, the diameter of the convex portion and the distance between the convex portions are as follows.
It is desirable to define an interval. The diameter of the projection is 50 μm or less, preferably 15 μm.
m or less, the resist film thickness when forming the same shape becomes thin.
It is good in that it can be done. The distance between the projections is 0.1 to 20 μm, preferably
Is set to 5 to 7 μm so that after exposure and development,
Shapes are continuously connected, thereby reducing flats
And good scattering characteristics can be obtained. According to the present invention, a liquid crystal display having such a structure is provided.
When the convex array group 2 is formed on the polarizing plate 3 in the display device,
In each case, each group G is divided and formed in a matrix.
At the same time, the arrangement pitch of the transparent electrodes 7 and the
The convex array group is divided according to the array pitch.
And each matrix-shaped rectangular area (group G) is transparent.
It corresponds to the intersection of the bright electrode 7 and the transparent electrode 11. As a result, the transparent electrode 7 and the transparent electrode
Interference occurs between the pole 11 and the color filter 13.
Light interference appears even when used outdoors.
lost. In the present invention, the convex array group
Each of the rectangular areas of the matrix shape is
In addition to corresponding to the intersection with the pole 11, the transparent electrode 7
A divisor or multiple of the array pitch (2 times, 3 times, 4 times, 5 times,
Times. . . ), The segments of the convex array group may be combined. Ah
Or a divisor or multiple of the arrangement pitch of the transparent electrodes 11 (2
Times, 3 times, 4 times, 5 times. . . ) To classify the convex array group
May be combined.
The number or multiple and the divisor of the arrangement pitch of the transparent electrodes 11 or
May be combined with a multiple. The arrangement pitch of the transparent electrodes 7 and 11
A divisor is a divisible number defined mathematically.
The pitch is 49 μm (49000 n
m), for example, 49 μm (49000 nm),
24.5 μm (24500 nm), 12.25 μm (1
2250 nm). . . . And so on. Also, such an array
If the pitch is 80 μm, for example, 80 μm, 40 μ
m, 20 μm, 16 μm, 10 μm, 8 μm, 5 μm,
4 μm, 2 μm, 1 μm. . . . Is a divisor. Next, the present inventor has determined that one pixel is 70 μm × 23.
0 μm area (intersection between transparent electrode 71 and transparent electrode 11)
) Of the convex array group 2 on the polarizing plate 3.
The trix-like section formation is changed in nine ways (1) to (9).
As a result, interference fringes were visually observed. The transparent electrode 11
And the pitch of the transparent electrodes 7 is 80 μm.
m, the width direction of the transparent electrode 11 is the Y direction,
The width direction of No. 7 was defined as the X direction. Where the adjacent transparent electrode
The distance between the transparent electrode 11 and the transparent electrode 7 was 10 μm. (1) X-direction width of group G as described above
Is 80 μm and the width in the Y direction is 240 μm. (2) X-direction width of group G as described above
Is 80 μm and the width in the Y direction is 80 μm. (3) The width of the group G in the X direction is 40 μm,
When the width in the Y direction is 60 μm. (4) The width of the group G in the X direction is 160 μm.
m, the width in the Y direction is 120 μm. (5) The width of the group G in the X direction is 480 μm.
When the width in the m and Y directions is 480 μm. (6) The width of the group G in the X direction is 40 μm,
When the width in the Y direction is 480 μm. (7) The width of the group G in the X direction is 100 μm.
When the width in the m and Y directions is 240 μm. (8) The width of the group G in the X direction is 80 μm,
When the width in the Y direction is 100 μm. (9) The width of the group G in the X direction is 100 μm.
When the width in the m and Y directions is 100 μm. As a result, in the examples (1) to (6),
Almost no interference fringes occurred. Also, the example of (7)
In the case of (8), interference fringes slightly occurred,
There was no problem. However, in the example of (9)
If so, interference fringes are remarkably generated, and there is a problem in practical use. What
In the present invention, the examples of (7) and (8) are also included. Note that the present invention is limited to the above embodiment.
Without departing from the scope of the present invention.
Any changes or improvements are not a problem. For example, in the above embodiment, S
TN type simple matrix type color liquid crystal display
Although it is described in detail, in addition,
There is even a pure matrix type liquid crystal display device
Or TN type simple matrix type liquid crystal display device or T
Twist nematic such as N-type active matrix type
Tic type liquid crystal display devices,
The same effect can be obtained with the crystal display device. In the above embodiment, the glass substrate
Resin convex array group was formed in
When a substrate made of fat is used, the substrate and the convex array group
May be integrally formed by a well-known molding method. According to the liquid crystal display device of the present invention, the polarizing plate
A convex array group is formed by arranging multiple convex portions on the main surface on the display surface side of
And that an anti-reflection film was coated on this convex array
In this way, both the light scattering function and the anti-glare function of the polarizing plate surface reflection
As well as simplifying the structure further
did it. According to the present invention, a light reflecting film is formed.
With the other substrate, light incident at an angle
The polarization state is symmetric at the time of emission and reflection.
Optical compensation can be easily performed, simplifying the design.
Reflective type with higher contrast and higher display quality
A liquid crystal display was obtained. Further, according to the present invention, one member is transparent.
A divisor or multiple of the array pitch at the electrodes, and / or
Or a divisor of the arrangement pitch in the transparent electrode of the other
Divides the convex array according to the multiple,
Eliminating interference fringes, high performance and highly reliable liquid crystal display
Could be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view of a reflection type liquid crystal display device of the present invention. FIGS. 2A, 2B, and 2C are process diagrams illustrating a method for manufacturing a polarizing plate according to the present invention. FIG. 3 is a diagram illustrating wavelength dispersion of light reflected on a polarizing plate surface. FIG. 4 is an enlarged photograph of a convex array group on a polarizing plate. FIG. 5 is a diagram showing a tilt angle number distribution of a concavo-convex shape (convex portion) on a polarizing plate surface according to the present invention. FIG. 6 is a diagram illustrating a method for measuring scattering characteristics of a liquid crystal display device. FIG. 7 is a diagram illustrating scattering characteristics of the liquid crystal display device. FIG. 8 is a schematic sectional view of a conventional reflective liquid crystal display device. FIG. 9 is a schematic sectional view of another conventional reflection type liquid crystal display device. FIG. 10 is a schematic sectional view of still another conventional reflection type liquid crystal display device. FIG. 11 is an explanatory diagram showing a pattern of a convex array group. FIG. 12 is an enlarged view of a main part of A shown in FIG. 11; FIG. 13 is a perspective view showing a combination structure of a convex array group, a color filter, and a transparent electrode. [Description of Signs] 1 ... Anti-reflection film 2, 29 ... Protrusion array group 3, 30 ... Polarizing plates 6, 15 ... Substrates 7, 11, 27 ... Transparent electrodes 8, 10 ... Alignment film 9 Liquid crystal layer 13 Color filter 14 Reflective film 26 Forward scattering plate 28 Reflective film

Claims (1)

Claims: 1. A member formed by coating a light reflecting film on one main surface of a substrate and sequentially laminating a transparent electrode and an alignment film on the light reflecting film; In addition, a nematic liquid crystal is interposed between the other member formed by sequentially laminating a transparent electrode and an alignment film to arrange the pixels in a matrix, and a polarizing plate is arranged on the other main surface of the transparent substrate of the other member. A liquid crystal display device in which a convex array group in which a plurality of resin convex portions are randomly arranged is formed on the main surface on the display surface side of the polarizing plate, and an antireflection film is coated on the convex array group. A divisor or multiple of the arrangement pitch of the one member in the transparent electrode,
A liquid crystal display device wherein the convex array group is divided in accordance with a divisor or a multiple of an array pitch in the transparent electrode of the other member.