JP3219733B2 - Reflective liquid crystal display - Google Patents

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 having high contrast and high reflection luminance.

[0002]

2. Description of the Related Art In recent years, with the remarkable improvement in display performance due to the progress of liquid crystal display technology, the application of liquid crystal display devices from calculators to word processors, personal computers (hereinafter, referred to as PCs), and even displays for monitors has been increasing. It has expanded. More recently, personal digital assistants (PDAs (Personal Digit)
alAssistant) is expected to expand the market as a display.

[0003] Due to their characteristics, PDAs that are premised on mobile applications require thin, light, and low-power displays, and the most suitable type is a reflective liquid crystal display device that does not require a backlight. (Hereinafter referred to as LCD). In fact, most of the PDAs that are currently commercialized adopt a reflective LCD. PDA is a new mobile P that will play a leading role in the multimedia era while integrating and differentiating with mini notebook PCs and network PCs.
C is expected to build a huge market. In the future, reflective LCD will play an increasingly important role as its key device.

FIG. 5 shows a configuration of a conventional reflection type LCD.
FIG. 5 is a diagram showing a configuration of a reflective LCD using a TN liquid crystal, which is generally used for watches, calculators, and electronic devices, in addition to a PDA.

A pair of transparent electrode groups 5 sandwiching the liquid crystal layer 55
Polarizing plates 51a and 51b are present on opposing outer surfaces of substrates 53a and 53b on which 4a and 54b are formed, respectively. On the back surface of one polarizing plate 51b, a reflecting plate 57 is provided via a high refractive index layer 59. Normally, the high refractive index layer 59 is made of an acrylic paste, and the polarizing plate 51b and the reflecting plate 5 are used as an adhesive layer.
7 is joined.

Light incident from the polarizing plate 51a passes through the liquid crystal layer 55, is reflected by the reflecting plate 57, and is again reflected by the polarizing plate 5a.
The light is emitted to the side 1a. By applying a voltage to the liquid crystal layer 55, light passing through the liquid crystal layer 55 can be modulated.

[0007] One of the problems of the reflective LCD is "color display". In order to realize color display, a method of forming a micro color filter layer of three colors of red, blue and green on the inner surface of a liquid crystal panel is usually adopted. In a transmission type LCD, a decrease in transmittance in the micro color filter layer is compensated for by a high-luminance backlight. On the other hand, it is difficult to use a micro color filter layer because there is no backlight in a reflection type LCD, and "monochrome display" is currently mainstream at present.

[0008] However, efforts are being made to achieve color display in reflective LCDs. There are two ways to achieve this: (1) a method using birefringence of liquid crystal, (2)
There are two methods of using the color filter layer by improving the transmittance of the liquid crystal panel.

Among them, the method (1) is to change the birefringence by controlling the voltage applied to the liquid crystal layer, thereby realizing a color display.
In this method, it is difficult to increase the number of colors to five or more due to restrictions such as gradation and controllability of the thickness of a liquid crystal layer.

Next, the method shown in (2) above uses two polarizing plates in the current panel configuration.
This is a method in which a color filter can be applied by improving the transmittance of a liquid crystal panel using a liquid crystal operation mode in which only one polarizing plate is used or not used. As one of the actual examples, a color filter layer is formed on the inner surface of the panel using a guest-host mode as a liquid crystal operation mode, and a voltage from a two-terminal element is applied to the liquid crystal layer via a reflective electrode to perform light modulation. There are ways to control (Sharp Technical Report,
56, 27, (1993)). By this method, a reflective LCD capable of displaying color is realized. Also,
As a method of using one polarizing plate, an example in which white and black light modulation is enabled by specifying the retardation of the liquid crystal layer and the optical compensating member and the optical axis of the polarizing plate and the optical compensating member in a reflective STN liquid crystal. (Japanese Patent Laid-Open No. 7-842)
No. 52). If this is combined with a color filter layer, color display is possible in principle.

In the above method, a reflective electrode is used. However, in order to achieve the performance of being bright as viewed from any angle like "paper", it is necessary to provide diffuse reflection in the panel structure. is important.

As a conventional example of a reflection type liquid crystal display device using a light scattering layer, there is one using a forward scattering film described in JP-A-8-201802. FIG. 6 shows the liquid crystal panel structure, in which 60 is a forward scattering film, 61 is a polarizing plate, 62 is a birefringent film, 63 is a liquid crystal cell, 64 is a transparent substrate, 65 is a color filter, 6
6 is a transparent electrode, 67 is a liquid crystal layer, 68 is a specular reflector, and 69 is a lower substrate.

[0013]

However, in the panel configuration as in the conventional example (Japanese Patent Laid-Open No. Hei 8-201802), when the scattering angle region of the light scattering layer is in all directions, the main observation by the observer is performed. If the scattering performance of the scattering layer is too high in the normal direction of the reflective liquid crystal display element, light is scattered at the time of emission, and there is a problem that image bleeding occurs.

Further, since the light is diffused in all directions in the scattering layer, a part of the light emitted from the liquid crystal display element is scattered in a direction that cannot be seen by an observer. Since the emitted light is not effectively used, the reflectivity in the viewing direction is low, and sufficient brightness in white display cannot be obtained, resulting in a problem that the contrast is reduced.

On the other hand, if the scattering direction is given too much directivity,
The ratio of specular reflection from the reflection plate increases, which deviates from ideal viewing angle-dependent characteristics such as paper.
In view of the above problems, the present invention is a reflective liquid crystal display element having a relatively simple configuration, white display is bright, black display is sufficiently dark, high contrast is obtained, and display characteristics are free from image blur. The purpose is to provide.

[0016]

In order to solve the above-mentioned problems, a reflection type liquid crystal display device according to the present invention comprises a linear polarizer, a transparent substrate, a liquid crystal layer, and a mirror reflector laminated in this order.
Of a reflective type liquid crystal display device having an arrangement is not a structure between the light scattering layer and the second of said light-scattering layer linearly polarized light child and the specular reflector, the first light-scattering layer, layer normal Line direction
For incident light whose angle is in the range of 10 to 60 degrees
And the haze rate (= 100 × (scattered light transmittance) / (total light rays)
A forward scattering film having a transmittance of 60% or more.
Ri, light scattering of the second light-scattering layer is isotropic, Ru symmetrical der angularly dependent layer normal direction of the light scattering
Things .

As a result, good black-and-white display can be achieved, high contrast can be obtained, and a clear image display can be obtained without image blurring in the normal direction of the reflective liquid crystal display element which is the main viewing direction of the observer. Can be

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a linear polarizer, a transparent substrate, a liquid crystal layer, and a specular reflector are laminated in this order, and further a first light scattering layer and a second light scattering layer. a scattering layer reflective liquid crystal display device having an arrangement is not a structure between the linearly polarized light child and the specular reflector, the first light
The scattering layer has an angle of 10 degrees to 60 degrees from the layer normal direction.
For the incident light within the range, the haze ratio (= 100 × (scattering)
(Light transmittance) / (total light transmittance) (formula 1)) is 60% or less
An upper forward scattering film, said second light scattering layer
Of the light-scattering is isotropic, the angular dependence of the light scattering is symmetric der shall respect the layer normal direction, by the first light-scattering layer, which is the main observation direction reflective liquid crystal display device A white display with no image blur and high reflectance by weakening the diffusivity of the emitted light in the normal direction of the light and scattering the incident light from angles other than the main observation direction in the main observation direction. Can be. Furthermore, by using the second light scattering layer, which has a symmetrical light scattering angle dependence, the specular reflection light with directivity from the specular reflector is alleviated, and the display characteristics with a gentle viewing angle dependence are realized. it can.

[0019] The invention according to claim 2 of the present invention, claim
2. The reflection type liquid crystal display device according to 1 , wherein the first light scattering layer
Is disposed between the linear polarizer and the transparent substrate, and the second light scattering
A structure in which a random layer is placed between a transparent substrate and a specular reflector
Have The feature of this configuration is that the second light-scattering layer is formed inside the transparent substrate (closer to the specular reflector) when viewed from the observer side, so that the second light-scattering layer and the second light-scattering layer are as thick as the transparent substrate. That is, the distance from the layer is reduced. As a result, the sharpness of the displayed image could be improved.
Originally, forming the first light-scattering layer together with the second light-scattering layer inside the transparent substrate is more effective in suppressing image blur, but the angle dependence of the light scattering is in the direction of the layer normal. Since it is difficult to form the first light scattering layer having the property of being asymmetric with respect to and satisfying the performance and reliability on the inner surface of the liquid crystal panel by a simple process, the configuration of claim 2 is practical. is there.

[0020] The invention described in claim 3 of the present invention, the first light-scattering layer, the azimuth angle of the projection direction of the central angle direction of the layer plane of the scattering angle range φ is the reflection type liquid crystal display device Assuming that the observation direction is φ = 0 degrees, the angle is approximately 90 degrees counterclockwise from 2 degrees.
Before two or more sheets stacked so that they fall within the range of 70 degrees
Is obtained by a reflection type liquid crystal display device according to 請 Motomeko 1 or 2 ing from rectangular scattering film, it is possible to vary the scattering intensity to the incident light to the first light-scattering layer was dependent on the incident angle Occupies most of the light reaching the observer,
By scattering incident light from an angle range of 90 degrees to 270 degrees in the azimuth, the reflected light is condensed toward the observer and an effect of obtaining a white display with high reflectance is obtained. In addition, the scattering direction of light emitted from the observer's angle range in which the normal direction and the azimuth of the reflective liquid crystal display element, which is the main observation direction for the observer, is −90 ° to less than 90 ° is weak. This has the effect of obtaining a clear image without causing image blurring.

[0021] The invention according to claim 4 of the present invention, the first light-scattering layer, the azimuth angle of the projection direction of the central angle direction of the layer plane of the scattering angle range φ is the reflection type liquid crystal display device when the observation direction is phi = 0 degrees, a reflective liquid crystal display element according to 請 Motomeko 1 or 2 Ru front scattering films der is approximately 180 degrees counterclockwise. Good viewing angle range when compared with display characteristics of the structure of 請 Motomeko 3 small but practically a level without problems.

[0022] The invention described in claim 5 of the present invention, the second light-scattering layers, according to any of the configurations der fine particles are dispersed in a resin layer Ru請 <br/> Motomeko 1-4 The light scattering characteristics are such that the angle dependence is symmetric with respect to the normal direction of the layer by scattering light at the interface between the resin layer and the fine particles having different refractive indices. Is used as a second light scattering layer of a reflection type liquid crystal display device. By adopting this configuration, it is possible to achieve a reflective display characteristic that is less dependent on the viewing angle and is closer to a display like paper.

According to a sixth aspect of the present invention , in the second light scattering layer , the haze ratio defined by the above (Equation 1) is 80%.
It is obtained by a reflection type liquid crystal display device according to any more small of I請 Motomeko 1-5, and reduce the image blur by suppressing haze, and viewing angle dependence by scattering in all directions Can be displayed gently.

The invention described in claim 7 of the present invention, either the first I請 Motomeko 1-6 such include a layer normal direction in the scattering angle region haze of 60% or more of the light scattering layer And a haze ratio for incident light from the normal direction of the first light scattering layer of less than 60%, which is a main observation direction for the observer. This has the effect of reducing image blur in the normal direction of the reflection type liquid crystal display element and obtaining a clear image. Further, since the haze value in an angle region other than the layer normal direction is as high as 60%,
This has the effect of diffusing the incident light in that area and condensing it in the main viewing direction to achieve good black and white display.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) A first embodiment will be described with reference to FIGS. FIG. 1 is a sectional view of a reflection type liquid crystal display device according to an embodiment of the present invention.

In FIG. 1, reference numeral 10a denotes a first light scattering layer in which the angle dependence of light scattering is asymmetric with respect to the layer normal direction.
10b is a second light scattering layer in which the angle dependence of light scattering is symmetric with respect to the layer normal direction, 11 is a polarizing plate as a linear polarizer, 12 is a retardation plate, 13 is a liquid crystal cell, and 14 is an upper transparent substrate , 15 are color filters, 16 is a transparent electrode, 17 is a liquid crystal layer, 18 is a reflective electrode as a specular reflector, and 19 is a lower substrate. As described above, this reflective liquid crystal display element has the first light scattering layer 10a in which the angle dependence of light scattering is asymmetric with respect to the layer normal direction, and the angle dependence of light scattering is symmetric with respect to the layer normal direction. And a second light scattering layer 10b.

FIG. 2 is a perspective view showing the concept of defining the angle of light incident on the light scattering layer. 20 is a light scattering layer, 2
1 is the incident light direction, 22 is the normal direction of the light scattering layer 20, 23
Indicates an apex angle θ from the normal direction 22, and 24 indicates an azimuth angle φ with respect to the observer direction.

A glass substrate was used as the upper transparent substrate 14 and the lower substrate 19. On the surface of the upper transparent substrate 14,
As the color filter 15, a pigment-dispersed type having a band-like arrangement of red, green, and blue was formed by photolithography.
Further, an ultraviolet-curable acrylic resin in which silica fine particles were dispersed was spin-coated on the color filter 15 and cured by ultraviolet irradiation. This is the second light scattering layer 10b in which the angle dependence of light scattering is symmetric with respect to the layer normal direction.
Becomes Further, a pixel electrode was formed thereon as a transparent electrode 16 using indium tin oxide (ITO).
Also, aluminum was formed on the lower substrate 19 by a sputtering method, and a predetermined reflective electrode 18 was formed by photolithography. The reflective electrode 18 mirror-reflects light.

On the transparent electrode 16 and the reflective electrode 18,
5w of N-methyl-2-pyrrolidinone of polyimide resin
After printing each t% solution and curing at 220 ° C,
An alignment film was formed by performing an alignment treatment by a rubbing method using rayon cloth so that the rubbings were antiparallel to each other.

Next, a glass fiber having a diameter of 5.7 μm is placed around the display pixel area on the upper transparent substrate 14.
A thermosetting sealing resin mixed with 0 wt% is screen-printed, and resin beads having a diameter of 4.5 μm are sprayed on the lower substrate 19 at a density of 150 beads / mm ² to form an upper transparent substrate 14.
And the lower substrate 19 were bonded together, and the sealing resin was cured at 150 ° C. After that, the anisotropy Δn of the refractive index becomes 0.
No. 14 nematic liquid crystal was vacuum-injected, sealed with an ultraviolet curable resin, and then cured by irradiation with ultraviolet light.

On the upper transparent substrate 14 of the liquid crystal cell 13 formed by the method described above, a first light-scattering layer 10a whose angle dependence of light scattering is asymmetric with respect to the layer normal direction 22 is provided as a first light-scattering layer 10a. Haze ratio (= 100 × (scattered light transmittance) / (total light transmission) for incident light 21 having an apex angle θ of 10 to 60 degrees with a forward scattering film (trade name: Lumisty) manufactured by KK Those having a ratio of not less than 60% were bonded so that the azimuth φ in the projection direction of the main scattering direction was 180 °. On the first light scattering layer 10a, a retardation plate 12 having a retardation value of 490 nm is stuck so that its slow axis is orthogonal to the rubbing direction of the upper transparent substrate 14, and a polarizing plate is further placed thereon. 11
A neutral gray polarizing plate (SQ1852AP, manufactured by Sumitomo Chemical Co., Ltd.) was bonded so that the absorption axis thereof formed an angle of 45 degrees with the rubbing direction of the upper transparent substrate 14.

Light incident from the polarizing plate 11 passes through the phase difference plate 12 and the liquid crystal layer 17 and reaches the reflective electrode 18. Since the retardation difference between the retardation plate 12 and the liquid crystal layer 17 is set to １ ／ of the wavelength of light, the light is in a circularly polarized state on the reflection surface, and the reflected light is again reflected on the polarization plate 11.
, The light becomes a linearly polarized state in a direction orthogonal to the incident linearly polarized light. At this time, a dark state can be realized.
That is, it is a normally black mode.

Further, by applying a voltage to the liquid crystal layer 17, light passing through the liquid crystal layer 17 can be modulated. The effective retardation of the liquid crystal layer 17 decreases with the applied voltage. When the retardation of the liquid crystal layer 17 and the retardation of the retardation plate 12 become equal, when the reflected light reaches the polarizing plate 11 again, it becomes a linearly polarized state in the same direction as the incident linearly polarized light. At this time, a bright state can be realized.

As described above, the micro color filter 1
By electrically controlling the brightness in correspondence with the RBG of No. 5, a reflective liquid crystal display element of bright color display was obtained. In this liquid crystal display device, the light scattering layers 10a and 10b are provided with one layer in which the angle dependence of the light scattering is asymmetric with respect to the layer normal direction 22 and one in which the light scattering layer is symmetric with respect to the layer normal direction 22. The light was efficiently condensed in the direction of the observer, and a bright, image-blurred display with a wide viewing angle range was realized.

In the above-described panel configuration, the first light-scattering layer 10a whose angle dependence of light scattering is asymmetric with respect to the layer normal direction 22 is a forward scattering film (trade name, manufactured by Sumitomo Chemical Co., Ltd.). Lumisti), a haze ratio of 60% or more is used for incident light 21 having an apex angle θ in an angle range of 10 degrees to 60 degrees, but instead, a scattering angle range of 0 degrees to 50 degrees is used. It has been confirmed that the use of a liquid crystal display makes the image in the normal direction of the liquid crystal display element unclear. Further, in the same panel configuration, the more the first light scattering layer 10a in which the scattering start angle is 5 degrees, 10 degrees, and 20 degrees, and the scattering angle region is further away from the layer normal direction 22,
The result is that the sharpness of the image in the normal direction of the panel surface is improved.

In addition, the angle dependence of the light scattering depends on the layer normal direction 2
An acrylic resin layer in which silica fine particles are dispersed is used as the second light scattering layer 10b, which is symmetrical with respect to 2, and the haze ratio is 80% by increasing the dispersion density of the silica fine particles.
When a film was prepared and attached to the liquid crystal display device according to the embodiment of the present invention and evaluated, the image became unclear.

Further, as the second light scattering layer 10b in which the angle dependence of light scattering is symmetric with respect to the layer normal direction, if there is a difference between the refractive indices of a plurality of constituent materials, in principle, the second light scattering layer 10b has a light scattering property. It is clear that combinations other than the constituent materials used in this embodiment are possible because of the effects.

(Embodiment 2) FIG. 3 is a sectional view of a reflection type liquid crystal display device according to Embodiment 2 of the present invention. The basic configuration and manufacturing method are the same as in the first embodiment.
The difference is in the configuration of the light scattering layer in which the angle dependence of the light scattering is asymmetric with respect to the layer normal direction.

In FIG. 3, 30a and 30b are first light-scattering layers in which the angle dependence of light scattering is asymmetric with respect to the layer normal direction, and 30c is symmetric with respect to the angle dependence of light scattering with respect to the layer normal direction. A second light scattering layer, 31 a polarizing plate, 32 a retardation plate, 33 a liquid crystal cell, 34 an upper transparent substrate, 35
Is a color filter, 36 is a transparent electrode, 37 is a liquid crystal layer, 3
8 is a reflective electrode, and 39 is a lower substrate. In this embodiment, the first light scattering layers 30a and 30b are composed of two layers.

FIG. 4A is a plan view showing a region including a scattering angle region of the light scattering layer, and FIG. 4B is a simplified diagram showing a scattering characteristic of incident light in a reflection type liquid crystal display device. It is.
In FIG. 4A, reference numeral 40 denotes an azimuth angle φ = 90 degrees to 27 degrees.
A region where the angle is 0 ° and the apex angle θ = 5 ° to 90 °, 41 indicates an observer. In FIG. 4B, 42 is a light scattering layer, 43 is a specular reflector, 44 is incident light, 45 is forward scattered light, 46 is outgoing light, and 47 is an azimuth φ = 90 degrees and 2 of a reflective display element.
3 shows a plane including 70 degrees.

In this embodiment, on the upper transparent substrate 34 of the liquid crystal cell 33, the first light scattering layers 30a and 30b whose angle dependence of light scattering is asymmetric with respect to the layer normal direction are provided as Sumitomo Chemical Industries, Ltd. Projection in the main scattering direction of a forward scattering film (Lumisti) manufactured by Co., Ltd., whose haze value is 60% or more with respect to incident light 21 having an apex angle θ of 10 to 60 degrees. Azimuth φ = 135 degrees and 2
They were bonded so that the angle was 25 degrees. The scattering angle region showing the characteristic that the haze value of these two asymmetric first light scattering layers 30a and 30b is 60% or more is the region 41 (FIG. 4).
(See (a)).

On the first light scattering layers 30a, 30b, a retardation plate 32 having a retardation value of 490 nm is attached so that its slow axis is orthogonal to the rubbing direction of the upper transparent substrate 34. A neutral gray polarizing plate 31 (SQ1852AP manufactured by Sumitomo Chemical Co., Ltd.) was bonded thereon as a linear polarizer such that the absorption axis thereof was at an angle of 45 degrees with the rubbing direction of the upper transparent substrate.

In this embodiment configured as described above, by providing the first light scattering layers 30a and 30b in which the scattering angle region for the incident light is included in the region 40, the apex angle θ = 10 degrees The incident light 44 in the range of 60 degrees and the azimuth angle φ = 90 degrees to 270 degrees is scattered and diffused in multiple directions upon incidence on the liquid crystal display element, and exceeds the normal direction and the azimuth angle φ = −90 degrees and 90 degrees The outgoing light 46 less than the light is not diffused. Thereby, light from the surroundings can be condensed toward the observer 41 and used effectively. As a result, not only a contrast of 12 and a reflectance of 14.5% in Y value conversion of white display in frontal characteristics were obtained, but also a very clear image was realized without blurring in a wide range.

The two asymmetric first light scattering layers 30
a, the azimuth of the projection direction of the main scattering direction of 30b is φ = 12
It has been confirmed that similar characteristics can be obtained even when the scattering angle range is included in the angle range satisfying the above conditions such as 0 degree and φ = 240 degrees, and φ = 150 degree and φ = 210 degrees.

In the first and second embodiments of the present invention, the liquid crystal cell is not limited to this operation mode, but may be another simple matrix drive or an active drive using a thin film transistor. Substantially the same effect can be obtained in the configuration using the reflection plate.

In Embodiments 1 and 2 of the present invention, metal reflecting electrodes 18 and 38 containing aluminum as a component are used as specular reflectors, but the effects aimed at by the invention are limited thereby. The same effect can be obtained by using a metal reflective electrode containing silver as a component, for example.

Further, in the description of the above embodiment,
Although the description has been given of the example in which the electric field control birefringence effect is used as the liquid crystal operation mode, the above-described operation mode in which the reflective electrode is used and the number of polarizing plates used is one or less can be displayed. is there.

[0048]

As described above, according to the present invention, the scattering property of light emitted in the normal direction of the reflection type liquid crystal display element can be made weaker than in other directions, which is the main observation direction of the observer. A clear image can be obtained without image blurring in the normal direction of the reflective display element. At the same time, by using a light scattering layer having an isotropic scattering property, a change in the viewing angle of the display characteristics can be moderated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic configuration of a reflective liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a conceptual perspective view for defining an angle of light incident on a light scattering layer.

FIG. 3 is a sectional view showing a basic configuration of a reflective liquid crystal display device according to a second embodiment of the present invention.

4A is a plan view showing a region including a scattering angle region of a light scattering layer, and FIG. 4B is a diagram schematically showing a scattering characteristic of incident light in a reflection type liquid crystal display device. It is.

FIG. 5 is a cross-sectional view showing a basic configuration of a conventional reflection type liquid crystal display device.

FIG. 6 is a cross-sectional view showing a basic configuration of another conventional reflection type liquid crystal display device.

[Explanation of symbols]

 10a, 30a, 30b First light scattering layer 10b, 30c Second light scattering layer 11, 31, Polarizer 12, 32 Phase difference plate 13, 33 Liquid crystal cell 14, 34 Upper transparent substrate 15, 35 Color filter 16, 36 Transparent electrodes 17, 37 Liquid crystal layers 18, 38 Reflective electrodes 19, 39 Lower substrate

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ogawa Tetsudo 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-9-113893 (JP, A) JP-A-9- 33882 (JP, A) JP-A-8-122755 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1335 G09F 9/00-9/46

Claims (7)

(57) [Claims] 1. A linear polarizer, the transparent substrate, a liquid crystal layer, by laminating a specular reflector in this order, further first between the light scattering layer and the second light-scattering layer linearly polarized light child and specular reflector Wherein the first light-scattering layer has an angle of 10 degrees from the layer normal direction.
For incident light within a range of from 60 degrees to the following (Equation 1)
Forward scatter filter having a haze ratio of 60% or more
A Lum, the light scattering of the second light-scattering layer is isotropic, reflection type liquid crystal display device angular dependence of the light scattering Ru symmetrical der respect layer normal direction. Haze rate = 100 × (scattered light transmittance) / (total light transmittance) (Equation 1) 2. The method according to claim 1, wherein the first light scattering layer comprises a linear polarizer and a transparent substrate.
Between the transparent substrate and the mirror surface.
The reflection type liquid crystal display device according to claim 1, wherein the reflection type liquid crystal display device has a structure disposed between the reflection plate and the projection plate . 3. The first light-scattering layer has an azimuth φ in a projection direction onto a layer plane in a central angle direction of a scattering angle range, and an observation direction of a reflective liquid crystal display element is φ = 0 degrees. ing of two or more front scattering film laminated to fall in the range from about 90 degrees counterclockwise to 270 degrees 請 Motomeko 1
Or the reflective liquid crystal display device according to 2. 4. The first light-scattering layer has an azimuth φ in a projection direction onto a layer plane in a central angle direction of a scattering angle range, and an observation direction of a reflective liquid crystal display element is φ = 0 degrees. reflection type liquid crystal display device according to 請 Motomeko 1 or 2 Ru front scattering films der is approximately 180 degrees counterclockwise. Wherein the second light-scattering layer, the reflection type liquid crystal display device according to any of the 請 Motomeko 1-4 configuration der Ru in which fine particles are dispersed in a resin layer. 6. A reflection type liquid crystal display device according to a second one of the (Formula 1) smaller than 80% haze ratio defined by I請 Motomeko 1-5 of the light scattering layer. 7. A first I請 Motomeko 1 haze ratio such contains a layer normal direction to the scattering angle regions is 60% or more of the light scattering layer
7. The reflective liquid crystal display device according to any one of 6.