JP3408438B2 - 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 reflective liquid crystal display device, and more particularly to a polarizing plateless mode reflective liquid crystal display device having a reflective electrode in a liquid crystal cell.

[0002]

2. Description of the Related Art With the rapid development of the Internet, an infrastructure is being set up that makes it easy to access and send necessary information "anytime, anywhere, anyone". The leading role of the interface device is a portable information device (hereinafter, MIT:
Mobile Information Tool).

The MIT, which is premised for mobile use, requires a thin, light, and low-power display by its nature, and the seeds that best match it are the reflection type liquid crystal display devices (hereinafter, referred to as "the backlight"). It is a reflective LCD). Actually, the reflection type LCD is adopted for most of the MITs currently commercialized. MIT is a low power CPU,
It is expected that a large market will be built in the future in combination with infrastructure development such as high-speed communication and OS for mobile terminals, and the reflective LCD will play an increasingly important role as a key device of MIT.

Conventionally, the reflection type LCD was mainly a two-sheet polarizing plate system in which a polarizing plate is arranged outside the upper and lower glass substrates and a reflecting plate is arranged outside the lower glass substrate, but 1).
From the viewpoint of improving reflectance and 2) colorization, a polarizing plateless mode has been proposed in which a specular reflection electrode is arranged in a liquid crystal cell and a light scattering liquid crystal is used as a modulation layer. (Ref: T.Sone
hara, M .; Yakiki, H .; Iisaka, Y.
Tsuchiya, H .; Sakurata, J .; Amak
o, T. Takeuchi: SID 97 DIGES
T, pp. 1023-1026 (1997)). In this method, since light is not absorbed by the polarizing plate, brighter display is possible compared to the method using the polarizing plate, and at the same time, since the reflective electrode is arranged in the cell, parallax due to the thickness of the glass is reduced. The feature is that color purity is eliminated and color purity does not decrease due to color mixing when colorization is performed using a color filter.

The structure will be described with reference to the drawings.

FIG. 2 shows a thin film transistor (TFT).
FIG. 6 is a configuration diagram of a conventional polarizing plate-less black-and-white reflective LCD that drives a light-scattering liquid crystal by using a.

On the substrate 201, the gate electrodes 210a, 2a
10b is selectively formed, and via the gate insulating layer 211,
The semiconductor layers 212a and 212b are formed in an island shape, the source electrodes 213a and 213b and the drain electrodes 214a and 214b are subsequently formed, and these constitute a TFT which is a switching element.

Reflective electrodes 202a, 202 to be pixel electrodes
b and 202c are interlayer insulating layers 215a, 215b, and 21.
The drain electrodes 214a and 214b are electrically connected via 5c. The reflective electrodes 202a, 202b,
202c is a substantially mirror surface state.

Then, the light-scattering liquid crystal 203 is sandwiched in the gap facing the transparent substrate 205 having the transparent electrode 204 formed on the inner surface thereof. The light-scattering liquid crystal 203 is formed by curing a mixed system of a liquid crystal material having a refractive index anisotropy and an acrylic polymer material, and has an optimum thickness and a liquid crystal / polymer material mixture ratio. The adjustment basically adjusts the forward scattering.

For example, the refractive index of the liquid crystal material for ordinary light is n⊥, the refractive index for extraordinary light is n‖, and Δn = n‖-n.
When ⊥> 0, n⊥ and the refractive index of the polymer material are set to be substantially the same. At this time, the light scattering liquid crystal 203 has a voltage of O
It takes a scattering state at FF and a transparent state at voltage ON.

The reflection type LCD having such a structure is called a polarizing plate less mode, and compared with the conventional two-sheet polarizing plate system,
The number of times the LCD incident light passes through the polarizing plate is changed from 4 to 0,
Bright display is possible. In addition, the reflective electrodes 202a, 20
Since the liquid crystal cells 2b and 202c are built in, a display without parallax can be obtained. In particular, in the case of a color reflective LCD that is combined with a color filter, the probability that incident light and emitted light will pass through different color regions is almost minimized, and from this point also bright display is possible.

However, the reflection type LCD having the above-mentioned structure has a problem that there is a viewing direction in which the display brightness becomes an illegal display state in the reflection luminance in the state of voltage ON corresponding to black.

That is, in the observing direction, which is almost the regular reflection direction with respect to the incident light, when the voltage corresponding to the black level is turned on, the light-scattering liquid crystal 203 becomes transparent, so that the reflected light having a strong specular component is generated. To be observed. Then, a negative-positive inversion phenomenon occurs in which the magnitude of the reflected brightness of the black level and the reflected brightness of the white level is reversed, that is, the reflected brightness of the reflected light becomes larger than the reflected brightness of the white level in the observation direction. The region in which such an incorrect display occurs exists in a range of about 10 degrees with respect to the angle of the regular reflection direction with respect to the incident light.

In order to solve this problem, a reflection type liquid crystal display device has been proposed which includes a reflection electrode having an uneven shape and a light scattering liquid crystal containing both a forward scattering component and a back scattering component (special feature. Wishhei 10-195400).

With this configuration, the voltage of the light scattering liquid crystal is turned on.
When it is transparent, the scattering property of the reflected light is enhanced, and the intensity of the reflected light returned to the outside of the liquid crystal panel is reduced. This allows
It is possible to reduce the specular component of the reflected light corresponding to the black level and improve the viewing angle dependence of the contrast. Further, when the voltage is OFF, that is, it is possible to suppress a decrease in reflected brightness at the white level.

The configuration will be described with reference to the drawings.

FIG. 3 is a block diagram of a conventional reflective liquid crystal display device based on Japanese Patent Application No. 10-195400.

The basic configuration is as described in the explanation of FIG. The difference from the configuration of FIG. 2 is that the reflective electrodes 302a, 30
2b and 302c are provided with an uneven shape on the light scattering liquid crystal 303 side, and the light scattering liquid crystal 303 is provided with a certain backscattering property.

Reflective electrodes 302a, 30 having an uneven shape
2b and 302c are formed as follows.

A photosensitive acrylic resin (for example, PC302 manufactured by JSR Co., Ltd.) is applied to the entire surface of the substrate 301 on which the TFTs are formed to provide interlayer insulating layers 315a, 315b and 315c, and contact holes are formed using a predetermined photomask.
Form an uneven shape, and add 0.9at of zirconium on it.
% Of aluminum was selectively formed and used as the reflective electrodes 302a, 302b, 302c having the uneven shape.

A light-scattering liquid crystal 303 having a backscattering property.
Was formed by mixing a nematic liquid crystal and an acrylic polymer precursor in a weight ratio of 2: 8, filling the liquid crystal panel, and irradiating UV to cure the mixture. At this time, the liquid crystal thickness was set between 5 and 10 μm. As the cell thickness increases, the backscattering property increases, and the white brightness increases when the voltage is OFF, but the driving voltage increases. On the other hand, when the cell thickness is small, the driving voltage is low, but the brightness of white is low. At this time, the increase of the driving voltage is about 1 V / μm. Therefore,
The optimum liquid crystal thickness within the above range was selected according to the reflection brightness required for the actual device and the driving capability of the driver.

As a result, the voltage of the light scattering liquid crystal 303 is turned on.
The reflective electrodes 302a, 302b, 3 at the time of being transparent
By increasing the scattering property of the reflected light at 02c, the total reflection component at the interface between the upper transparent substrate 305 and the air layer is increased, and the intensity of the reflected light emitted to the outside of the liquid crystal panel can be reduced. As a result, the specular component of the reflected light corresponding to the black level can be reduced and the viewing angle dependence of the contrast can be improved. Further, by imparting the backscattering property to the light-scattering liquid crystal 303, the decrease in the reflection brightness when the voltage is OFF, that is, at the time of scattering is reduced, and a display in which the white level is sufficiently bright can be obtained.

This display principle will be described with reference to the drawings.

FIG. 4A shows a Japanese Patent Application No. 10-195400.
FIG. 6 is an explanatory view of a display principle of a conventional reflective liquid crystal display device of a polarizing plateless system based on the above.

When the voltage is turned off, the light incident on the liquid crystal panel is scattered due to the difference in the refractive index between the liquid crystal and the polymer, and is further reflected by the reflecting electrode to be scattered and reflected as in the OFF state in FIG. On the other hand, when the voltage is ON, the light-scattering liquid crystal becomes almost transparent, and as shown in the ON state in the figure,
The reflection brightness when ON is reflected with a lower gain than the reflection brightness when OFF.

At this time, the reflection brightness Bo when the voltage is ON is observed both in the observation direction B, which is the direction of specular reflection with respect to the incident light, and in the observation direction A of FIG.
n, Aon and reflected brightness Boff, Aof when voltage is off
Between f, always Bon <Boff, Aon <Aoff
And the good viewing angle characteristics without negative / positive inversion can be obtained.

The reflection brightness is Bon and Boff, Aon and A
Since the brightness is modulated during each off, it is possible to display including a halftone. As shown in the same figure, the reflected brightness in the voltage OFF state corresponding to white has little angle dependence, and not only the high reflected brightness due to no absorption of the polarizing plate but also the high light peculiar to the light scattering liquid crystal is obtained. White with color purity is obtained, and good visibility similar to "paper" is obtained.

[0028]

However, in the conventional reflective type liquid crystal display device without a polarizing plate based on the above-mentioned Japanese Patent Application No. 10-195400, the reflection luminance when the voltage corresponding to the black level is ON is not sufficiently low, Therefore, there is a problem that sufficient contrast cannot be obtained.

This is because the interlayer insulating layers 315a and 315a of FIG.
15b and 315c allow light to pass through without scattering, and each element such as the source electrodes 313a and 313b is made of an aluminum material. Therefore, the source is provided from the gap between each of the reflective electrodes 302a, 302b and 302c. This is because the light that reaches and is reflected by the electrodes 313a and 313b is strong.

In view of the above problems, it is an object of the present invention to provide a reflection type liquid crystal display device which reduces the reflection brightness when the liquid crystal layer corresponding to the black level is transparent.

[0031]

[Means for Solving the Problems] The first invention (Claim 1)
Corresponds to a predetermined substrate, a predetermined transparent substrate, a light-scattering liquid crystal having both forward scattering property and backscattering property, which is disposed between the substrate and the transparent substrate. Each of the reflective electrode group disposed between the light-scattering liquid crystal and having a concave-convex shape on the light-scattering liquid crystal side, the transparent electrode disposed between the transparent substrate and the light-scattering liquid crystal, and the reflective electrode group. A light scattering layer disposed in the gap between the reflective electrodes or at a position closer to the substrate than the gap is provided, and the light scattering layer is composed of an acrylic resin film in which SiO ₂ fine particles are dispersed. Incident on a given object
The light reflected by the object is positively reflected from the total reflected light collected by the integrating sphere.
The diffuse reflectance Rdr is obtained by removing the reflection component.
The diffuse reflectance Rdr of the reflective electrode is 0.8 ≦ Rd.
A reflective liquid crystal display device satisfying r ≦ 1.0 .

As described above, in the light-scattering-mode reflective liquid crystal display device having the concave-convex reflective electrode built in, the light-scattering layer is provided at the gap between the reflective electrodes or at a position closer to the substrate than the gap. The light-scattering property can be imparted even to the gap between the reflective electrodes which has not been imparted with the light-scattering property, and the reflection brightness at the black level can be reduced.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, a reflective liquid crystal display device according to Embodiment 1 of the present invention will be described.

FIG. 1 is a block diagram of a reflective liquid crystal display device according to Embodiment 1 of the present invention.

The basic configuration is "conventional technology" and is shown in FIGS.
As described above.

The difference from the configuration of FIG.
That is, the light scattering layers 115a, 115b, and 115c are formed below the gaps a, 102b, and 102c, in other words, at positions closer to the substrate 101 than the gaps between the reflective electrodes. Further, the interlayer insulating layers 315a and 315 of FIG.
15b and 315c are light scattering layers 115a that scatter light,
It means that they are replaced with 115b and 115c. The light scattering layers 115a, 115b, 115c are
In addition to the light scattering function, it also has the same insulating function as the interlayer insulating layer described in the description of the conventional example of FIGS.

Thus, the reflective electrodes 102a, 102
The light scattering layer 115 is provided below the gaps b and 102c.
Since a, 115b, and 115c are arranged, the light reaching the respective elements such as the source electrodes 113a and 113b is dispersed by the light scattering of the light scattering layers 115a, 115b, and 115c. In addition, the light reflected by each element such as the source electrodes 113a and 113b receives light scattering layers 115a, 115b and 115.
Returning to c, the light scattering layers 115a, 115b,
Light is scattered by 115c. Therefore, the light specularly reflected by each element such as the source electrodes 313a and 313b becomes weaker, and the reflection brightness when the voltage of the light-scattering liquid crystal 103 corresponding to the black level is ON, that is, when it is transparent, can be reduced as compared with the conventional case. . That is, the total reflection component at the interface between the transparent substrate 105 and the air layer increases, and the intensity of the reflected light emitted to the outside of the liquid crystal panel can be reduced. As a result, the reflected light corresponding to the black level can be reduced and the contrast can be increased.

Now, the light scattering layers 115a, 115b, 11
5c is an acrylic resin (eg JSR PC302)
A solution in which SiO ₂ fine particles having an average particle diameter of 0.1 to 2 μm are dispersed therein is applied by a spinner and then cured. The film thickness was 3 μm. Light scattering layers 115a, 115
The processing after forming b and 115c is basically the same as the conventional example.

Next, a region where the light scattering layer contributes as a light scattering region will be described with reference to the drawings.

FIG. 5 is a plan view of the reflective liquid crystal display device according to the first embodiment of the present invention.

As shown in the figure, the reflective electrodes 502a, 5
02b, 502c, 502d, 502e, 502f, 5
The planar gap between 02g, 502h, and 502i becomes the light scattering region 508.

The display principle at this time will be described with reference to the drawings.

FIG. 4 (2) is an explanatory view of the display principle of the reflective liquid crystal display device of the polarization plateless type based on the first embodiment of the present invention.

As shown in the figure, in the first embodiment, the reflection luminance when the voltage is turned on is lowered by the above-mentioned effect at any observation angle, as compared with the conventional case of FIG. 4 (1).

This is because the scattering property in the gap between the reflective electrodes is increased, the total reflection component at the interface between the upper transparent substrate and the air is increased, and the light emitted from the liquid crystal panel is decreased.

At this time, the reflective electrodes 102a, 10a of FIG.
Although a certain effect can be obtained even if 2b and 102c are any uneven surface, when the diffuse reflectance Rdr is defined as the total reflection light condensed by the integrating sphere from which the specular reflection component is removed,
The diffuse reflectance Rdr of each reflective electrode is 0.8 ≦ Rdr ≦
If the unevenness of each reflective electrode is set to be in the range of 1.0, the scattering of the reflected light can be further enhanced, and at the same time, the amount of light emitted to the outside of the liquid crystal panel can be suppressed. This can be realized, for example, by controlling the shape of the uneven surface of each reflective electrode so that the average inclination angle of the unevenness is 16 degrees or more.

On the other hand, regarding the reflection characteristic corresponding to the white level, since the backscattering property is given to the light-scattering liquid crystal, the amount of light directly bulk-scattered and reflected from the light-scattering liquid crystal layer increases, and the light-scattering liquid crystal emits light to the outside. Since it is possible to suppress the decrease in the intensity of the emitted light, a sufficiently bright display can be realized.

In the first embodiment described above, the light-scattering layer is formed at a position closer to the substrate 101 than the gap between the reflection electrodes. However, even if the light-scattering layer is formed in the gap between the reflection electrodes. Good. When the light scattering layer is formed at a position closer to the substrate 101 than the gap between the reflection electrodes, it may be formed so as to replace all the conventional interlayer insulating layers as shown in FIG. The light-scattering layer may be formed so as to replace only the lower part of the gap between the electrodes. In short, the light-scattering layer is formed in the gap between the reflective electrodes of the reflective electrode group,
Alternatively, it may be arranged at a position closer to the substrate 101 than the gap.

(Second Embodiment) Next, a reflective liquid crystal display device according to a second embodiment of the present invention will be described.

FIG. 6 is a block diagram of the reflective liquid crystal display device according to the second embodiment.

The difference from FIG. 1 is that color filters 609a, 60 are provided on the inner surface of the transparent substrate 605 facing the substrate 601.
9b and 609c are formed.

Reflecting electrode 6 serving as a reflecting surface for reflecting incident light
Since 02a, 602b, and 602c are in the cell, the probability that the incident light and the emitted light will pass through different color regions is also minimized in the present embodiment that controls scattered light, as described in the first embodiment. Light scattering liquid crystal 60 equivalent to black level
(3) It is possible to realize a color reflection type liquid crystal display device having high brightness and high color purity while maintaining the effect of reducing the reflection brightness when transparent.

(Third Embodiment) Next, a reflective liquid crystal display device according to a third embodiment of the present invention will be described.

FIG. 7 is a block diagram of the reflective liquid crystal display device according to the third embodiment.

The difference from FIG. 6 is that a scattering plate 706 is arranged on the outer surface of the transparent substrate 705 which faces the transparent substrate 705. Scattering plate 70
As 6, a film having fine particles dispersed in a polymer base material and having an isotropic scattering function was used.

Since the incident light and the emitted light are scattered when passing through the scattering plate 706, in addition to the effect shown in the first embodiment, the light scattering characteristic when the voltage is ON can be further improved. It is possible to realize an even better black level than in the first embodiment.

(Fourth Embodiment) Next, a reflective liquid crystal display device according to a fourth embodiment of the present invention will be described.

FIG. 8 shows a configuration diagram of the reflection type liquid crystal display device of the fourth embodiment.

The difference from FIG. 6 is that a scattering film 807 is formed on the inner surface of the transparent substrate 805 which faces the transparent substrate 805. Scattering film 80
7 is formed by applying a resin, in which fine particles are dispersed in an acrylic polymer precursor, to the inner surface of the transparent substrate 805, which faces the transparent substrate, and curing the resin, and then forming the color filter 809.
a, 809b, 809c and the transparent electrode 804 were formed in order.

The effect of the fourth embodiment is the same as that of the third embodiment, but by disposing the scattering film 807 having the scattering function in the liquid crystal cell, the transparent substrate 8
The effect of image blur caused by the thickness of 05, that is, the distance between the reflecting surface and the scattering surface can be minimized, and a clear display can be realized. Here, the reflective surface is the reflective electrode 8
02a, 802b, 802c, and the scattering surface means the scattering film 807. Further, further explaining the above, rather than disposing a scattering plate or a scattering film on the outside of the transparent substrate 805, the scattering film 807 on the inside of the transparent substrate 805.
By arranging, the influence of the image blur caused by the scattering plate or the scattering film can be reduced by the thickness of the transparent substrate 805.

(Fifth Embodiment) Next, a reflective liquid crystal display device according to a fifth embodiment of the present invention will be described.

FIG. 9 is a block diagram of the reflection type liquid crystal display device according to the fifth embodiment.

The difference from FIG. 8 lies in the position where the scattering film 907 is formed, and the color filters 909a, 909b, 909.
It is formed between c and the transparent electrode 904. The material and forming method of the scattering film 907 and the effect thereof are as described in the fourth embodiment.

Further, as another effect in this case, the scattering film 907 is provided with the color filters 909a, 909b and 909c.
It also has the effect of functioning as a protective film for the. Thereby, the reliability of the liquid crystal panel can be improved.

(Sixth Embodiment) Next, a reflective liquid crystal display device according to a sixth embodiment of the present invention will be described.

FIG. 10 is a block diagram of the reflection type liquid crystal display device according to the sixth embodiment.

The difference from FIG. 9 is that the antireflection layer 1008 is formed on the opposing outer surface of the transparent substrate 1005. The antireflection layer 1008 is formed of, for example, a thin film multilayer film of SiO ₂ and ITO.

As a result, unnecessary reflection on the surface of the liquid crystal panel, that is, the transparent substrate 1005 can be suppressed, and at the same time, the amount of light incident on the liquid crystal panel can be increased and the contrast can be improved.

In the first to sixth embodiments described above,
The reflective liquid crystal display device in which the liquid crystal is driven by the TFT has been described as an example.
Even in the case of a reflective liquid crystal display device of a type in which an insulator-metal (MIM) is used to drive liquid crystal by the MIM, the effects described in the above-described respective embodiments can be obtained. Further, even in the case of a simple matrix type reflective liquid crystal display device that does not use a switching element, the effects described in each of the above-described embodiments can be obtained.

[0071]

As is apparent from the above description, the present invention can provide a reflective liquid crystal display device that reduces the reflection brightness when the liquid crystal layer corresponding to the black level is transparent.

As described above, in the light-scattering mode reflection type liquid crystal display device having the concave and convex reflection electrodes built-in, the reflection brightness when the liquid crystal layer corresponding to the black level is transparent is reduced,
It is possible to realize a bright display with high white color purity by improving the contrast, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a reflective liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a conventional reflective liquid crystal display device.

FIG. 3 is a configuration diagram of a conventional reflective liquid crystal display device different from FIG.

FIG. 4 is an explanatory view of a display principle of a reflection type liquid crystal display device of the related art and the present invention.

FIG. 5 is a plan view of the reflective liquid crystal display device according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram of a color reflection type liquid crystal display device according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a color reflection type liquid crystal display device according to a third embodiment of the present invention.

FIG. 8 is a configuration diagram of a color reflection type liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 9 is a configuration diagram of a color reflection type liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 10 is a configuration diagram of a color reflection type liquid crystal display device according to a sixth embodiment of the present invention.

[Explanation of symbols]

101, 201, 301, 601, 701, 801, 9
01, 1001 ... Substrate 102a, 102b, 102c, 202a, 202b,
202c, 302a, 302b, 302c, 502a,
502b, 502c, 502d, 502e, 502f,
502g, 502h, 502i, 602a, 602b,
602c, 702a, 702b, 702c, 802a,
802b, 802c, 902a, 902b, 902c,
1002a, 1002b, 1002c ... Reflective electrodes 103, 203, 303, 603, 703, 803, 9
03, 1003 ... Light scattering liquid crystals 104, 204, 304, 604, 704, 804, 9
04, 1004 ... Transparent electrodes 105, 205, 305, 605, 705, 805, 9
05, 1005 ... Transparent substrate 706 ... Scattering plates 807, 907, 1007 ... Scattering film 1008 ... Antireflection layers 609a, 609b, 609c, 709a, 709b,
709c, 809a, 809b, 809c, 909a,
909b, 909c, 1009a, 1009b, 100
9c ... Color filters 110a, 110b, 210a, 210b, 310a,
310b, 610a, 610b, 710a, 710b,
810a, 810b, 910a, 910b, 1010
a, 1010b ... Gate electrodes 510a, 510b ... Gate lines 111, 211, 311, 611, 711, 811, 9
11, 1011 ... Gate insulating layers 112a, 112b, 212a, 212b, 312a,
312b, 512a, 512b, 512c, 512d,
612a, 612b, 712a, 712b, 812a,
812b, 912a, 912b, 1012a, 1012
b ... Semiconductor layers 113a, 113b, 213a, 213b, 313a,
313b, 613a, 613b, 713a, 713b,
813a, 813b, 913a, 913b, 1013
a, 1013b ... Source electrodes 513a, 513b ... Source lines 114a, 114b, 214a, 214b, 314a,
314b, 514a, 514b, 514c, 514d,
614a, 614b, 714a, 714b, 814a,
814b, 914a, 914b, 1014a, 1014
b ... Drain electrodes 115a, 115b, 115c, 615a, 615b,
615c, 715a, 715b, 715c, 815a,
815b, 815c, 915a, 915b, 915c,
1015a, 1015b, 1015c ... Light scattering layers 215a, 215b, 215c, 315a, 315b,
315c ... Interlayer insulating layer

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Mizuno 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Yoshio Iwai Yoshio Iwai, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-7-56152 (JP, A) JP-A-8-29811 (JP, A) JP-A-10-246896 (JP, A) JP-A-10-48669 (JP, A) JP 11-84360 (JP, A) JP 2000-284305 (JP, A) Patent 3244055 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G02F 1 / 1343,1 / 1362 G02F 1 / 1333,1 / 1335

Claims (5)

(57) [Claims] 1. A predetermined substrate, a predetermined transparent substrate, a light-scattering liquid crystal having a forward scattering property and a back scattering property, which is disposed between the substrate and the transparent substrate, and the substrate and A reflective electrode group disposed between the light scattering liquid crystal and having an uneven shape on the light scattering liquid crystal side, a transparent electrode disposed between the transparent substrate and the light scattering liquid crystal, and each of the reflective electrode groups. A light scattering layer for scattering light, which is disposed in a gap between the reflection electrodes or in a position closer to the substrate than the gap, the light scattering layer is formed of an acrylic resin film in which SiO ₂ fine particles are dispersed. Light that is incident on a predetermined object and reflected by the object is an integrating sphere.
The total reflection light collected by
When the diffuse reflectance is Rdr, the diffuse reflectance Rdr of the reflective electrode is 0.8 ≦ Rdr ≦
A reflective liquid crystal display device characterized by satisfying 1.0 . Wherein said reflective-type liquid crystal display device according to claim 1, comprising the arranged color filter between the transparent substrate and the transparent electrode. 3. disposed on said outer surface is not a substrate side of the transparent substrate, the reflection type liquid crystal display device according to any one of claims 1 to 2, characterized in that it comprises a scattering plate for scattering light. 4. disposed between the transparent electrode and the transparent substrate, the reflection type liquid crystal display device according to any one of claims 1 to 3, characterized in that it comprises a scattering layer for scattering light. 5. The antireflection layer, which is disposed on the outermost side of the transparent substrate, which is not the substrate side, and which prevents reflection of incident light on the transparent substrate. 4. The reflective liquid crystal display device according to any one of 4 above.