JPH10282521A - Reflection type liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type liquid crystal display device having high reflection factor on a reflection layer and capable of displaying a bright and highly quality image. SOLUTION: Relating to the liquid crystal display device 1, a transparent substrate 2 provided with a transparent electrode 5 is opposed to a counter substrate 3 provided with plural pixel electrodes 7, switching elements 8 for driving these pixel electrodes 7, a reflection layer 10 for reflecting incident light, and a 1/4 wavelength layer 18 through a prescribed gap and a liquid crystal layer 27 including a dichroic coloring matter is formed in the gap. The reflection layer 10 is constituted of a metallic film 12 having a rugged surface and a laminated film 13 formed by laminating plural kinds of dielectric thin films having respectively different refractive indexes on the surface of the film 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a reflection type liquid crystal display device in which the reflectivity of a reflection layer is increased to improve light use efficiency.

[0002]

2. Description of the Related Art A liquid crystal display device such as a liquid crystal color display has excellent features such as light weight and thinness.
Currently, it is widely used as a display for AV devices such as small televisions, video cameras, and digital cameras, and OA devices such as word processors and personal computers. However, in the conventional liquid crystal display device, there is a problem to be improved such that a backlight is required because light use efficiency is as low as several percent and power consumption is increased. In response to such a problem, a reflective liquid crystal display device using natural light has been proposed and put to practical use.

In such a reflection type liquid crystal display device, increasing the transmittance of a panel constituting a display surface and increasing the reflectance of a reflection layer are important technologies for ensuring brightness. For example, attempts have been made to increase the transmittance of a transparent electrode. As for the reflection layer for reflecting incident light, although silver (Ag) is excellent in reflection characteristics, aluminum (Al) is generally used from the viewpoint of deterioration and economical considerations. However, such a metal reflective layer made of Al or the like is easily damaged and oxidized, so that a protective film such as a silicon oxide film is usually required.

A guest-host mode device using a liquid crystal layer containing a dichroic dye is known as a reflection type liquid crystal display device. This reflective guest-host liquid crystal display device is configured to increase the transmittance and the brightness by using no polarizer.

[0005]

However, in the reflection type liquid crystal display device, as described above, although it is desired to improve the reflectance in order to increase the brightness, the reflection layer is provided on the reflection layer.
Except for the formation of the protective film, no film is formed for the purpose of increasing the reflectivity, and thus, in reality, the brightness has not yet been sufficiently ensured. Also, in the reflection type guest-host liquid crystal display device, since absorption occurs in each layer as a constituent element of the device, as a result, light use efficiency,
That is, there is a problem that the reflectance is low. Specifically, reflection occurs at the interface and absorption occurs at the ITO electrode, the liquid crystal layer, the reflection layer, and the like. In particular, as described above, Al is usually used for the reflective layer, and the reflectivity thereof is 90%.
%, Which is not enough reflectance to obtain higher brightness.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reflection type liquid crystal display device which improves the reflectance by a reflection layer and enables bright and high quality display. It is in.

[0007]

Means for Solving the Problems The present inventor has made intensive studies to solve the above-mentioned problems. As a result, although no example is known in which the present invention is applied to a reflective layer in a reflective liquid crystal display device, the reflectance is increased. The inventors came to the conclusion that there was a technique for overcoating a dielectric film for the purpose, and completed the present invention by applying this technique to a reflective layer.

That is, the reflection type liquid crystal display device according to the first aspect of the present invention includes a transparent substrate having a transparent electrode, a plurality of pixel electrodes and switching elements for driving the pixel electrodes, and reflects incident light. A reflective layer and a counter substrate on which a quarter-wave layer is formed are opposed to each other with a predetermined gap therebetween, and a liquid crystal layer containing a dichroic dye is formed in the gap. The reflective layer has an uneven surface. A metal film formed having, a laminated film formed by laminating a plurality of types of dielectric thin films having different refractive indexes on the metal film,
Is a means for solving the above problem.

According to this reflection type liquid crystal display device, the reflection layer is composed of a metal film formed with an uneven surface and a laminated film made of a plurality of types of dielectric thin films having different refractive indexes. Therefore, for example, by setting the configuration of the laminated film based on the principle described below, it is possible to increase the reflectance as compared with the case of a reflective layer composed of a single metal film.

Generally, in order to increase the reflectance R by using a thin film,
Is such that the following equations (1) and (2) are satisfied.
It is known that this should be done. That is, as shown in FIG.
So that the refractive index is n₀Thin film T₀, The refractive index is n₁Thin film
T ₁, The refractive index is n_TwoThin film T_TwoFrom the side opposite to the incident side
When stacked in this order, R = (n₁ ^Two-N₀n_Two/ N₁ ^Two+ N₀n_Two)^Two ... (1) n₁d₁= (Λ / 4) (2k + 1) (2) (where d₁Is a thin film T₁, Λ is the wavelength of the incident light,
k is 0 or a positive integer. ) Where T₀Is a metal film, and T_TwoIs the air layer (ie, n
_Two= 1), then n₁> N₀If,
Metal film T₀And thin film T₁The reflectance R of the laminated film consisting of
Thin film T₁No metal film T₀Higher than single layer reflectivity
Become.

Further, if T ₀ is a metal film, since the absorption in this layer occurs, the refractive index is represented by a complex number, it is treated as n-ik. For example on the metal film T _0, as the dielectric film T ₁ and the refractive index of the refractive index n _1, each of the film thickness and the dielectric film T ₂ of the n ₂ is the thickness of (λ / 4) when two-layer coating, the reflectivity, R = _{[{1- (n 1 / n 2} ) 2 (n-ik)} / {1+
(N ₁ / n ₂ ) ² (n−ik)｝ ² .

According to a second aspect of the present invention, there is provided a reflective liquid crystal display device, comprising a transparent substrate having a transparent electrode, a plurality of pixel electrodes and a switching element for driving the pixel electrodes, and a reflective layer for reflecting incident light. And 1
A counter substrate having a wavelength layer formed thereon is opposed to the substrate via a predetermined gap, and a liquid crystal layer containing a dichroic dye is formed in the gap, and the reflective layer is formed to have an uneven surface. And a multilayer laminated film formed by laminating a plurality of types of dielectric thin films having different refractive indices on the irregular layer.

According to this reflection type liquid crystal display device, the reflection layer is formed with a concave and convex surface, and a plurality of types of dielectric thin films having different refractive indices are laminated on the concave and convex layer. Therefore, the reflectance of the reflective layer can be increased by setting the configuration of the multilayer laminated film based on, for example, the principle described below.

The dielectric thin film is replaced with a thin film T having a high refractive index._H(Crown
Folding rate; n_H) And a thin film T having a low refractive index_L(Refractive index;
n_L) And two types (ie, n_H> N_L) And this
And two types of thin films, T_a/ T_H(T_LT_H)^q/ T₀ ｛However, T_aIs a thin film T_HAnd thin film T_LMultilayer product consisting of
Layer film (T_H(T_LT_H) ^q) Represents the film to be the layer above,
T₀Represents an uneven layer (refractive index; n) serving as a base of the multilayer laminated film.
₀), And q is the thin film T_HAnd thin film T_LNumber of layers with sand
That is, it represents a positive integer. ).
In this case, the reflectance is represented by the following equation (3). R = [｛1- (n_H/ N_L)^2q(N_H/ N₀)｝ / ｛1+ (n_H/ N_L)^2q (N_H/ N₀)｝]^Two (3) Therefore, the reflectance obtained from such an equation is high.
Value, so that the configuration of the multilayer laminated film is appropriately set.
By manufacturing, the reflectance can be improved
It is.

The multilayer film (T_H(T_LT_H)^q)
(T _LT_H)
Change for each repetition unit and aim for each repetition unit
By changing the wavelength of light, the
High reflectance can be obtained. That is, the center wavelength
By stacking the shifted quarter-wave type alternating multilayer films,
High reflectance can be obtained over a wide wavelength range.
You.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a reflection type liquid crystal display device of the present invention will be described in detail. FIG. 1 is a diagram showing a first embodiment of the reflection type liquid crystal display device of the present invention. In FIG. 1, reference numeral 1 denotes a reflection type liquid crystal display device in a guest-host mode. The reflective liquid crystal display device 1 is a full-color display device employing an active matrix system and incorporating a micro color filter, in which a transparent substrate 2 and a counter substrate 3 are opposed to each other via a predetermined gap (for example, 5 μm). It is arranged and configured in a state where it has been set.

The transparent substrate 2 is made of a transparent base material such as glass and is disposed on the light incident side, and has a micro color filter 4 and an ITO on its inner surface (surface on the side of the opposing substrate 3).
A transparent electrode 5 made of a transparent conductive film such as a polyimide film and an alignment film 6 made of a polyimide or the like are formed and arranged in this order. Here, the micro color filter 4 is formed by being divided for each pixel and colored in different colors.

The counter substrate 3 includes a plurality of pixel electrodes 7 made of a transparent conductive film such as ITO, and these pixel electrodes 7.
Are provided with switching elements 8.
In addition, a reflection layer 10 is formed on the counter substrate 3 on an interlayer insulating film 9 covering the switching element 8. The reflective layer 10 is subdivided corresponding to the individual pixel electrodes 7, and as shown in FIG. 2, a metal film 12 made of Al on an uneven layer 11 made of a resin having an uneven upper surface. , And a laminated film 13 formed on the metal film 12.

The surface layer portion of the resin layer is exposed and developed by a known lithography technique to divide it into a predetermined shape, for example, a square shape, and further heated, and the divided surface layer portion is subjected to a reflow process. In this case, as shown in FIG. 2, the convex portion is formed in a substantially spherical shape. The metal film 12 is formed by depositing Al on the surface of the uneven layer 11, and the surface of the metal film 12 has an uneven surface. In this example, the laminated film 13 is formed as shown in FIG.
As shown in FIG. ₂ , the MgF ₂ film 14 (refractive index;
1.38) and a ZnS film 15 (refractive index; 2.35), which are in this order, that is, Z having a large refractive index.
The nS film 15 is deposited and stacked so that the nS film 15 faces upward.

In this laminated film 13, each dielectric thin film (M
The gF ₂ film 14 and the ZnS film 15) have a thickness of 100 to
It is about 350 nm. That is, since the wavelength of light in the visible region is generally about 400 to 700 nm, 100 nm which is a quarter wavelength of 400 nm which is the lower limit thereof.
From the above, 350 which is a half wavelength of 700 nm which is the upper limit
By setting the thickness of the dielectric thin film in the range of nm,
This is because the expression (2) shown above can be satisfied in the visible region of light, thereby increasing the reflectance. And under such a configuration, the reflection layer 10
Since the metal film 12 has an uneven surface, the metal film 12 has scattering characteristics, thereby preventing the specular reflection of the incident light and improving the image quality, and the laminated film 13 is formed on the metal film 12. Thus, the metal film 12 has a higher reflectance than the reflectance of the single layer.

On the reflection layer 10, the reflection layer 10,
A flattening layer 16 is formed so as to cover the switching element 8, a base alignment layer 17 made of polyimide or the like is formed on the flattening layer 16, and a 波長 wavelength is formed on the base alignment layer 17. A layer 18 is formed. The 波長 wavelength layer 18 is made of a polymer liquid crystal film, and is uniaxially oriented by the base orientation layer 17 formed below the polymer liquid crystal film. The pixel electrodes 7 are formed on the quarter wavelength layer 18, and an alignment film 19 made of polyimide or the like is formed on the pixel electrodes 7 so as to cover the pixel electrodes 7.

The switching element 8 is formed by a thin film transistor having a bottom gate structure, and has a laminated structure in which a gate electrode 20, a gate insulating film 21, and a semiconductor thin film 22 are sequentially stacked from the bottom. Semiconductor thin film 22
Is, for example, formed from polycrystalline silicon,
The channel region that matches the gate electrode 20 is protected from above by a stopper 23.

A pair of contact holes (not shown) are formed in the interlayer insulating film 9 covering the switching element 7, and a source electrode 24 and a drain electrode 25 are formed with the contact holes buried. Have been. The source electrode 24 and the drain electrode 25 are formed by patterning aluminum. In particular, the drain electrode 25 is formed so as to be continuous with the metal film 12 of the reflection layer 10, so that the drain electrode 25 and the metal film 12 have the same potential. Further, the pixel electrode 7 is electrically connected to the drain electrode 25 through a contact hole 26 formed through the flattening layer 16 and the quarter wavelength layer 18. Therefore, the metal film 12 of the reflective layer 10 and the pixel electrode 7
The same potential is applied via the drain electrode 25, so that an unnecessary electric field is not applied to the flattening layer 16 and the 波長 wavelength layer 18 located between the reflective layer 10 and the pixel electrode 7. Has become. On the other hand, a signal voltage such as a video signal is supplied to the source electrode 24.

A guest host liquid crystal layer 27 is provided in a gap between the transparent substrate 2 and the counter substrate 3. The guest-host liquid crystal layer 27 is composed mainly of a nematic liquid crystal 28 having negative dielectric anisotropy and containing a complex type dichroic dye 29 at a predetermined ratio. here,
The guest host liquid crystal layer 27 is disposed between the alignment film 6 of the transparent substrate 2 and the alignment film 19 of the counter substrate 3, and is vertically aligned by the alignment films 6 and 19 in the present embodiment without applying a voltage. Then, the state shifts to the horizontal alignment in the state of voltage application.

In the reflection type liquid crystal display device 1 having such a configuration, the reflection layer 10 is formed of a metal film 12 having an uneven surface, and two types of dielectric thin films (MgF
Since it is constituted by the laminated film 13 composed of the _two films 14 and the ZnS film 15), the reflectivity thereof is higher than that of a reflective layer formed of a single layer of the metal film 12. In addition, since the metal film 12 has a scattering characteristic due to the unevenness, the image quality can be improved by preventing the specular reflection of incident light. Therefore, the reflection type liquid crystal display device 1
Then, the display can be made bright and high image quality.

In the above embodiment, the guest-host liquid crystal layer 27 is configured to be vertically aligned when no voltage is applied and horizontally when no voltage is applied. However, the present invention is not limited to this. Instead, it may be configured such that the liquid crystal molecules are horizontally aligned when no voltage is applied and vertically aligned when a voltage is applied. In the above embodiment, the reflection layer 10
The uneven surface of the metal film 12 was formed by forming the metal film 12 on the uneven layer 11. Alternatively, for example, after forming a metal film on a flat surface, the surface layer portion of the metal film may be formed. The surface of the metal film may be roughened with an acid or alkali.

Further, in the above embodiment, the laminated film 13
To MgF_TwoAlthough formed from the film 14 and the ZnS film 15,
The invention is not limited to this, as a dielectric thin film,
Al _TwoO_Three(Refractive index; 1.62), TiO_Two(Refractive index;
2.2-2.7), CdS (refractive index; 2.6), SiO
_Two(Refractive index; 1.46), CaF_Two(Refractive index; 1.2
3), MgO (refractive index; 1.75), ZrO_Two(refraction
Rate; 2.05) and the like.
Dielectric thin films can be laminated not two but three or more,
Further, each of these dielectric thin films is laminated in multiple layers.
You can also.

Next, the second embodiment of the reflection type liquid crystal display device of the present invention will be described.
An embodiment will be described. The difference between the second embodiment and the first embodiment lies in the configuration of the reflective layer. That is, in the second embodiment, as shown in FIG. 3, a reflective layer 30 is formed with a concave and convex surface, and a plurality of types of dielectric thin films having different refractive indexes are formed by the concave and convex layers. And a multi-layer film 32 formed by multi-layer stacking on the multi-layer film 31.

The uneven layer 31 is the same as the uneven layer 11 in the first embodiment. The surface layer of the resin film is exposed and developed, and further subjected to reflow processing by heating. It is formed in a spherical shape. In this example, the multilayer laminated film 32 is composed of an Al ₂ O ₃ film (refractive index: 1.62) and a TiO ₂ film (refractive index: 2.2 to ₂ ) as dielectric thin films.
2.7) are alternately vapor-deposited on each other, and are laminated and formed so as to be multilayered.

Here, also in the multilayer laminated film 32,
Each dielectric thin film (Al_TwoO_ThreeFilm, TiO _TwoMembrane) with the previous example
For the same reason, the thickness is about 100-350 nm
Is done. The number of lamination of each dielectric thin film, that is,
Regarding q in the equation (3), the reflection obtained from the equation (3)
Set the rate R to be a larger value than the desired value.
I just need. Further, the repeating unit in the multilayer laminated film 32
Is a laminated film (Al) composed of a set of dielectric thin films._TwoO_Three
Film, TiO_TwoFilm), the film thickness of the repeating unit
Changed every time, ie, 1/4 wave shifted center wavelength
Overlay the long alternating multilayer film and aim for each repeating unit.
The wavelength of the light to be emitted.
High reflectance can be obtained over a wide wavelength range.

In the reflection type liquid crystal display device 1 according to the second embodiment, the reflection layer 30 has a plurality of types of dielectric thin films having different refractive indices from the uneven layer 31 formed with the uneven surface. Is formed by the multi-layered film 32 formed by multi-layer stacking, so that the reflectivity thereof is higher than that of a conventional reflecting layer formed of a single metal film. In addition, since the reflective layer 30 has a scattering property by disposing the uneven layer 31 having the uneven surface as a lower layer, it is possible to prevent specular reflection of incident light and improve image quality. Therefore, in this reflective liquid crystal display device, the display can be made bright and high image quality.

Incidentally, also in the second embodiment, the above-mentioned Mg thin film is used as the dielectric thin film constituting the multilayer laminated film 32.
F ₂ and ZnS, furthermore CdS, SiO ₂ , CaF ₂ ,
MgO, ZrO ₂ or the like can be used, and three or more kinds of these dielectric thin films can be laminated instead of two kinds.

(Experimental example) Reflective layer 1 of the first embodiment.
0 each dielectric thin film (MgF ₂ film 14, ZnS film 1
Samples 1 to 4 were prepared by changing the thickness of 5) as follows. Further, the dielectric thin film is made of Al ₂ O ₃ instead of the MgF ₂ film 14 and TiO ₂ is used instead of the ZnS film 15.
As a sample 5, a sample 5 was formed. In addition, about these sample 1-sample 5, each dielectric thin film is formed on the metal film 13,
Each of the dielectric thin films was formed one by one.
Further, in the second embodiment, each dielectric thin film (Al ₂ O ₃ film, TiO ₂
The thickness of ₂ film) is formed by changing as follows, Samples 1-4
Was prepared. Sample 1 Film type; MgF ₂ film and ZnS film Thickness: 120 nm each Sample 2 Film type; MgF ₂ film and ZnS film Thickness: 140 nm each Sample 3 Film type; MgF ₂ film and ZnS film Thickness: 160 nm Sample 4 Film type; MgF ₂ film and ZnS film Thickness: 180 nm each Sample 5 film type; Al ₂ O ₃ film and TiO ₂ film thickness; 140 nm each Sample 6 film type; Al ₂ O ₃ film and TiO ₂ film thickness; Number of repeated lamination of 140 nm; 7 times Sample 7 film type; Al ₂ O ₃ film and TiO ₂ film thickness; Each of 140 nm repeated laminations: 9 times Sample 8 film type; Al ₂ O ₃ film and TiO ₂ film thickness; Each 140nm repeated number of layers; 11 times

The reflectance of the samples 1 to 8 thus prepared was examined by a spectroscope (Otsuka Electronics Co., Ltd .; instantaneous multi-measurement system). The measurement of the reflectance was performed by a spectral colorimetric method based on an XYZ (Yxy) display system. That is, the light reflected from the sample is divided by a plurality of sensors, and the reflectance for each wavelength is measured. Then, integration calculation was performed based on the obtained data to calculate three values of tristimulus values X, Y, and Z, and the reflectance was determined from this.

For comparison, the structure of the reflective layer 10 in the reflective liquid crystal display device 1 shown in FIG.
The reflectivity was also examined for the configuration excluding No. 3, that is, the reflection layer composed only of the uneven layer 11 and the metal film 12 made of Al. The results obtained are shown below. From the above results, it was confirmed that the reflectance of the reflective layer in the reflective liquid crystal display device of the present invention was higher than that of the conventional one.

The reflectivity of each of the reflection layer of Sample 2 and the reflection layer of Comparative Example for each wavelength of light was examined, and the obtained results are shown in FIG. As shown in FIG.
It was found that it had a higher reflectance than that of the comparative example over the entire visible light region of 0 to 700 nm. Further, when a video signal was input to the reflection type liquid crystal display device provided with the reflection layer of Sample 1 to Sample 8 to display an image, compared with the liquid crystal display device provided with the comparative example,
Vivid full-color moving images could be displayed, and images with high contrast could be obtained.

[0037]

As described above, in the reflection type liquid crystal display device according to the first aspect of the present invention, the reflection layer is made of a metal film having an uneven surface and a plurality of dielectric films having different refractive indexes. Since it is composed of a laminated film composed of a body thin film, its reflectance can be increased as compared with the case of a reflective layer composed of a single metal film, thereby enabling excellent gradation expression. . Further, since the metal film has a scattering characteristic due to the unevenness, it is possible to prevent specular reflection of incident light and improve image quality. Therefore, in this reflective liquid crystal display device, the display can be made bright and high image quality.

According to a second aspect of the present invention, in the reflection type liquid crystal display device, the reflection layer is formed by forming a plurality of dielectric thin films having different refractive indexes on the uneven layer. Since it is composed of a multilayer laminated film formed by lamination, the reflectivity of the reflective layer can be increased as compared with a conventional reflective layer formed of a single layer of a metal film. A gradation expression can be made possible. Also,
Since the reflection layer has a scattering property by disposing a rough layer having a rough surface as a lower layer, it is possible to prevent specular reflection of incident light and improve image quality. Therefore, in this reflective liquid crystal display device, the display can be made bright and high image quality.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a main part of a first embodiment of a reflection type liquid crystal display device of the present invention.

FIG. 2 is a side sectional view of a main part for describing a reflection layer of the reflection type liquid crystal display device shown in FIG.

FIG. 3 is a side sectional view of a principal part for describing a reflection layer in a second embodiment of the reflection type liquid crystal display device of the present invention.

FIG. 4 is a graph showing the reflectance in the visible light region of the reflective layer of the present invention and the reflective layer of the comparative example.

FIG. 5 is a diagram for explaining the operation of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Reflection type liquid crystal display device 2 Transparent substrate 3 Counter substrate 5 Transparent electrode 7 Pixel electrode 8 Switching element 10, 30
Reflecting layer 11, 31 Uneven layer 12 Metal film 13 Laminated film 14 MgF ₂ film 15 ZnS film 18 Quarter wavelength layer 27 Guest host liquid crystal layer 29 Dichroic dye 32 Multi-layer laminated film

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 23, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

The dielectric thin film is replaced with a thin film T having a high refractive index._H(Crown
Folding rate; n_H) And a thin film T having a low refractive index_L(Refractive index;
n_L) And two types (ie, n_H> N_L) And this
And two types of thin films, T_a/ T_H(T_LT_H)^q/ T₀ ｛However, T_aIs a thin film T_HAnd thin film T_LMultilayer product consisting of
Layer film (T_H(T_LT_H) ^q) Represents the film to be the layer above,
T₀Represents an uneven layer (refractive index; n) serving as a base of the multilayer laminated film.
₀), And q is the thin film T_HAnd thin film T_LNumber of layers with sand
That is, it represents a positive integer. ).
In this case, the reflectance is represented by the following equation (3). R = [｛1- (n_H/ N_L)^2q(N_H ^Two/ N₀)｝ / ｛1+ (n_H/ N_L) ^2q (N_H ^Two/ N₀)｝]^Two (3) Therefore, the reflectance obtained from such an equation is high.
Value, so that the configuration of the multilayer laminated film is appropriately set.
By manufacturing, the reflectance can be improved
It is.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G02F 1/1343 G02F 1/1343 1/137 500 1/137 500

Claims (2)

[Claims] A transparent substrate provided with a transparent electrode; a plurality of pixel electrodes; and a reflective layer provided with a switching element for driving the pixel electrodes and reflecting incident light.
A reflection type liquid crystal display device in which a counter substrate on which a 波長 wavelength layer is formed is opposed to each other through a predetermined gap, and a liquid crystal layer containing a dichroic dye is formed in the gap. A reflective film comprising: a metal film having a surface; and a laminated film formed by laminating a plurality of types of dielectric thin films having different refractive indexes on the metal film. Liquid crystal display. 2. A transparent substrate having a transparent electrode, a plurality of pixel electrodes, and a reflective layer having a switching element for driving the pixel electrodes and reflecting incident light.
A reflection type liquid crystal display device in which a counter substrate on which a 波長 wavelength layer is formed is opposed to each other through a predetermined gap, and a liquid crystal layer containing a dichroic dye is formed in the gap. An uneven layer formed with a surface, and a multilayer laminated film formed by stacking a plurality of types of dielectric thin films having different refractive indices on the uneven layer. Reflective liquid crystal display.