JP2000131685A - Reflection type color liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color liquid crystal display device of a low cost which makes it possible to obtain high-contrast images bright when viewed from any directions. SOLUTION: The color liquid crystal display device of a bright and high contrast which is capable of lessening the unnecessary reflected light from non-apertures and is capable of determining a numerical aperture only by nearly the spacings between reflection films 3 and the spacings between the transparent electrodes 6 and 11 is obtained by adopting the element structure which forms only the colored layers 5a to 5c without forming light shielding layers on the reflection films 3 by removing the reflection films 3 of the portions corresponding to the light shielding layers and imparting a light shielding function to the resin layers 2 having the ruggedness under the reflection films 3 when the device has the built-in reflection plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a function effective for a reflection type color display.

[0002]

2. Description of the Related Art As a conventional reflection type color liquid crystal display device, Japanese Patent Application Laid-Open No. 4-243226 discloses a reflection type color liquid crystal display device in which a reflection film is provided on a large number of fine projections formed of resin and a method disclosed in Japanese Patent Application Laid-Open No. 6-230364. The light reflection plate is patterned into a shape almost the same as that of the color filter as described in Japanese Patent Publication No. There has been proposed a color filter for a reflective color liquid crystal display device which does not hinder driving.

[0003]

According to the above prior art, the light reflecting plate is patterned into a shape substantially the same as the shape of the color filter, so that the light reflecting film constituting the light reflecting plate through the defect of the color filter. Even if the transparent electrode is electrically short-circuited, the liquid crystal driving is not hindered, and unnecessary reflected light from the non-opening portion can be prevented, so that the black matrix is not required. However, a color filter for a reflection type liquid crystal display device is inevitably made to have a spectral characteristic in which light in a wavelength region which should be light-shielded is actively used. Therefore, depending on a display mode (for example, a normally open mode), a light-shielding layer is not provided. In the case of an element structure having no device, there is a problem that the contrast is reduced.

Further, in the above-described prior art configuration in which only a color filter layer is formed on a roughened reflecting plate, a liquid crystal layer having a uniform thickness cannot be formed, so that image quality (brightness and contrast) deteriorates. There were also issues.

In the prior art, when a flattening layer is provided on a color filter layer in order to form a liquid crystal layer having a uniform thickness, there is a problem that the brightness is reduced.

[0006] An object of the present invention is to provide a liquid crystal display device which solves the above-mentioned problems.

[0007]

Means for Solving the Problems On a number of fine irregularities made of a resin in which a black pigment having a light shielding function is dispersed on a glass substrate, a reflection made of a metal such as aluminum or silver is formed only in a portion corresponding to the opening. A red, green, and blue color filter having a flattening function is formed on the reflective film, and a transparent electrode and an orientation control film are formed on the color filter. After combining a transparent electrode and the other electrode substrate having an alignment control film formed on a glass substrate with a spacer material interposed therebetween for defining the thickness of the liquid crystal so that the alignment control films face each other. And a reflection type color liquid crystal display device using a liquid crystal display element in which liquid crystal is sealed and sealed in the gap between the electrode substrates by a vacuum sealing method or the like.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS On a built-in diffused reflection plate in which a reflection film patterned for each pixel electrode is laminated on an uneven resin layer having a light-shielding function according to the present invention, a colored filter (red, green) having a flattening function is provided. , Blue or cyan, magenta, and yellow), an example of a specific element configuration of the reflective color liquid crystal display device is as follows.

(1) Numerous fine concave or convex portions (pitch: 10 to 30 μm, height or depth: 0.5 to 0.5)
(2.0 μm) on a polymer base film on which a photosensitive resin or a thermosetting resin is applied (thickness: 1.0 to 3.0 μm) on a polymer base film provided at random and dried using a transfer film. (50 to 150 ° C.) and pressure (1 to 1) using a roll laminator or the like from above the polymer base film.
2 kg / cm ² ) and the thin film of the photosensitive resin or the thermosetting resin is bonded to a glass substrate (roll speed:
0.1-3 m / min), (2) a step of peeling off the polymer base film as a support, and (3) a reflective film (aluminum, aluminum, Thin film of silver, etc., thickness: 100-300n
m), (4) patterning the reflective film corresponding to each pixel electrode (removing a portion corresponding to a non-opening), and (5) a color having a flattening function on the reflective film. Forming a filter (red, green, blue or cyan, magenta, yellow, film thickness: 1.0 to 5.0 μm); (6) a transparent electrode (ITO) on the color filter
(Indium Tin Oxide), a film thickness: 100 to 300 nm), and (7) a process of forming an orientation control film (polyimide, film thickness: 50 to 150 nm) on the transparent electrode. And (8) a step of forming a transparent electrode on a glass substrate, and (9) a step of forming an orientation control film (polyimide, film thickness: 50 to 150 nm) on the transparent electrode. (10) An orientation control film (polyimide, film thickness: 50 to 150) on the transparent electrode
(11) a spacer material (polymer bead, silica bead, glass fiber, glass fiber, etc.) so that the alignment control film faces each other.
A process of bonding and sealing the periphery of both electrode substrates with a sealing material (the above-mentioned spacer material is dispersed in epoxy resin), (12) enclosing a liquid crystal between the two electrode substrates, A liquid crystal display element is formed by a sealing step.

(13) a step of bonding a predetermined phase plate and a polarizing plate to the surface of the glass substrate on which only the transparent electrodes of the liquid crystal display element are formed; and (14) a step of mounting a liquid crystal driving IC on the liquid crystal display element. (15) connecting the liquid crystal display element to a frame,
The liquid crystal display device of the present invention is completed by the process of assembling in a case or the like.

According to the present invention, (1) a black pigment or the like is dispersed to impart a light-shielding function to a diffusion underlayer (irregular resin layer), and a reflection film laminated on the diffusion underlayer is formed in an opening. Since the light reflected from the non-opening portion can be greatly reduced by arranging only the portions corresponding to the above, a reflective color liquid crystal display device capable of displaying a bright and high-contrast image can be provided.

(2) A black matrix can be removed by providing a light-shielding function to the diffusion underlayer (irregular resin layer) and arranging the openings of the reflector, so that a low-cost reflective color capable of displaying a bright and high-contrast display. A liquid crystal display device can be provided.

(3) The flattening layer is removed by forming a color filter layer by a printing method, a transfer method, or the like, thereby giving the color filter layer a flattening function for eliminating a step of the diffuse reflection plate. Therefore, a low-cost reflective color liquid crystal display device capable of displaying a bright and high-contrast image can be provided.

(4) By providing the light-shielding function to the diffusion underlayer and the flattening function to the color filter layer, the number of elements constituting the element can be reduced, so that a low-cost reflective color liquid crystal display device can be provided. .

The resin material used for the diffusion base layer (concavo-convex resin layer) may be appropriately selected from photosensitive or non-photosensitive materials depending on the application.

Next, a reflection type liquid crystal display element suitable for carrying out the present invention will be described. In the present invention, the display scale 640
X 240 dots (pixel pitch: 0.3 mm x 0.3 mm, pixel size: 0.288 mm x 0.288 mm, screen diagonal size:
8.1 inch) 1/2 VGA compatible handheld type personal computer (hereinafter handheld P)
C) and reflective supermarkets used for outdoor applications
A twisted nematic color liquid crystal display (hereinafter referred to as a reflective STN color liquid crystal display) will be mainly described.

However, since the present invention does not depend on the liquid crystal driving method, any of the active addressing method and the passive method can be applied, and the present invention is not limited to the STN liquid crystal display method.

(Embodiment) [Embodiment 1] An example of a method for producing a reflective type color liquid crystal display device of the present invention will be described with reference to the schematic sectional view of FIG.

Step (a): A polymer film 15 (polyethylene terephthalate, film thickness: 50 μm, pitch of concave portions: approximately 15) serving as a support having a large number of concave portions formed on the surface.
μm, recess depth: 1.2 μm), a black resin layer 2 made of an acrylic resin in which a black pigment or carbon is dispersed.
(Epoxy resin or imide resin is also acceptable.
The black resin layer 2 is coated with a photosensitive or non-photosensitive resin (thickness: 1.5 μm), dried, and then protected on the black resin layer 2 (not shown, polyethylene, thickness: 6 μm).
A transfer film provided with is prepared.

The transfer film is applied to a glass substrate 1 (soda glass, plate thickness: 0.7 mm) on a roll laminator 18 (substrate temperature: 100 ° C., roll temperature: 100 ° C., roll pressure:
6 kg / cm ² , feed speed: 0.5 m / min)
Next, main curing (240 ° C./30 minutes) is performed, and the polymer film is peeled off to form a black resin layer 2 having a large number of convex portions.

Step (b): An aluminum reflective film layer 3 (silver can be used, film thickness:
100 nm).

Step (c): After forming a photosensitive resin layer 4 (thickness: 1.5 μm) on the reflective film layer 3, the photosensitive resin layer 4 is exposed to ultraviolet rays 17 via a photomask 16. I do.

Step (d): The photosensitive resin layer 4 is developed under predetermined developing conditions to remove the portion of the reflective film layer 3 corresponding to the inter-electrode gap or the light-shielding layer, and the portion corresponding to the opening ( Reflective film layer 3 (size: 288 μm × 8) only on strips
8 μm, gap: 12 μm).

Step (e): Non-photosensitive colored resin layers 5a, 5b, 5c (thickness: 2.) are formed on the reflective film layer 3 patterned in a strip shape so as to eliminate irregularities on the surface of the reflective film layer 3.
0 μm) is formed by intaglio printing.

Step (f): The non-photosensitive colored resin layer 5
The a, 5b, and 5c are cured under predetermined curing conditions to form red, green, and blue (or yellow, cyan, and magenta) colored layers 5a, 5b, and 5c.

Step (g): The colored layers 5a, 5b, 5c
A transparent electrode 6 (ITO, film thickness: 260 nm, number of electrodes:
240 lines, electrode pitch: 300 μm, electrode width: 292 μ
m, interelectrode gap: 8 μm scanning electrode) and an orientation control film (polyimide, film thickness: 70 nm).

Step (h): A transparent electrode 11 (ITO film, film thickness) is formed on one of the electrode substrates formed by the above (a) to (g) and a glass substrate 10 (soda glass, thickness: 0.7 mm). : 260 nm, number of electrodes: 1920, electrode pitch: 1
00 μm, electrode width: 92 μm, interelectrode gap: 8 μm signal electrode), alignment control film 12 (polyimide, film thickness: 70)
0 nm) is disposed such that the transparent electrodes 6 and 11 face each other, and a spacer material 13 (particle diameter: 6) of polymer beads corresponding to the thickness of the liquid crystal layer 14 is provided.
μm).

Next, both electrode substrates are sealed with a sealing material in which polymer beads (silica beads or the like can also be used) mixed with an epoxy resin formed around the substrate, and a liquid crystal 14 (cyano PCH and a tran derivative) is placed between the electrode substrates. A reflective color liquid crystal display element is produced by enclosing and sealing (photosensitive acrylic resin or photosensitive epoxy resin) a liquid crystal composition comprising: a refractive index anisotropy Δn: 0.133, twist angle: 250 ° did. Further, as shown in FIG. 2, predetermined phase plates 20, 21 and a polarizing plate 22 were arranged on the glass substrate 10 of the reflection type color liquid crystal display device to produce a reflection type color liquid crystal display device.

Further, as shown in FIG. 3, a tape carrier package 31 having a liquid crystal driving IC mounted on the reflective type color liquid crystal display element 30 and a printed circuit board provided with a power supply circuit and a control circuit are mounted. Thus, a reflective color liquid crystal display device was manufactured. Next, the reflective film layer 3, the colored layers 5a, 5 in the reflective color liquid crystal display device of the present invention.
FIG. 4 shows the relationship between b, 5c and the transparent electrodes 6, 11.
As shown in the figure, the reflective film layer is removed from the portion corresponding to the inter-electrode gap between the transparent electrodes 6 and 11, and not only the colored layer is laminated on the portion where the reflective film layer is removed, but also Unnecessary incident light is absorbed by the black resin layer 2 which is the base layer of the above, so that even in a structure having no light-shielding layer, unnecessary reflected light from the non-opening portion can be eliminated. There is.

The relationship between the reflective film layer and the transparent electrode, as shown in the figure, is better if the gap between the reflective films is set to be slightly larger than the gap between the electrodes of the transparent electrode with respect to image quality such as brightness and contrast. It is advantageous.

In this embodiment, a large number of minute convex (hemispherical) resins having a diameter of about 15 μm and a height of about 1.2 μm are used as a black resin layer serving as a base layer of the diffuse reflection plate so that light interference does not occur. The film having a thickness of 1 as a reflective film
Although the aluminum film having a thickness of 00 nm was formed, the material, shape, size, and the like of the convex resin can be selected according to the purpose.

According to the present embodiment, not only the reflection film on the black resin layer, which is the base layer of the diffuse reflection plate, is formed only in the openings, but also the light incident on the non-opening portions is reflected on the base layer of the diffusion reflection plate. Since the light is absorbed by the black resin layer, unnecessary reflected light from the non-opening portion is eliminated, and a reflective color liquid crystal display device that can obtain a bright and high-contrast image from any direction can be provided.

In particular, since the aperture ratio, which affects the brightness, is determined by the patterning accuracy of only the reflective film and the transparent electrode, which are relatively easy to pattern, the bright and high-contrast image can be easily achieved from any direction. A reflective color liquid crystal display device can be provided.

Further, by forming the reflection plate and the color filter on the same glass substrate, a high-definition signal electrode corresponding to the color filter can be directly formed on the other electrode substrate on the glass substrate. There is also an effect of improving the yield.

In particular, in this embodiment, if the coloring layers 5a, 5b, 5c formed on the diffuse reflection plate having large irregularities are formed by a printing method or a transfer method, the coloring layer 5 having a flat surface can be obtained.
Since a, 5b, and 5c can be formed, a flattening layer is not required, and an inexpensive reflective color liquid crystal display device that can obtain a bright and high-contrast image can be provided.

Further, since the signal electrodes having a narrow electrode width and a small electrode pitch are formed directly on a glass substrate, mounting and correction of a TCP mounting a liquid crystal driving IC are easy, and the production yield of the liquid crystal element is reduced. There is also an effect of improving.

Further, if a transfer film in which a reflective film layer and a resin layer are sequentially laminated on a polymer base film having fine irregularities is used, the manufacturing process can be greatly reduced. In particular, by using a method in which three colors of red, green, and blue can be printed in the same step for forming the colored layer, a colored layer having a flattening layer function can be formed.
It is possible to provide a low-cost reflective color liquid crystal display device capable of obtaining a high-contrast image in which the entire display surface is uniform and bright.

Although not shown, between the reflector 3 and the colored layers 5a, 5b, 5c, or between the colored layers 5a, 5b, 5c.
A flattening layer may be provided between a, 5b, 5c and the transparent electrode 6.

In this embodiment, the diffuse reflection plate and the color filter are formed on the same substrate. However, even if the diffuse reflection plate and the color filter are formed on different substrates, the brightness is slightly lowered. Similar characteristics are obtained.

Embodiment 2 Next, an example of another reflection type liquid crystal display device of the present invention will be described with reference to the schematic sectional view of FIG. As shown in the figure, a glass substrate 1 (soda glass,
Resin layer 2 (resin: acrylic, convex pitch: about 15 μm, height: 0.7 mm)
1.2 μm), reflective film 3 (silver, film thickness: 100 nm), light shielding film layer 24 (silver, film thickness: 100 nm, blackening treatment: sulfurizing treatment, pitch: 300 μm × 100 μm, width: 12 μm)
m), coloring layers 5a, 5b, 5c (pigment type, film thickness: 3.
0 μm, width: 100 μm), transparent electrode 6 (ITO film, film thickness: 260 nm, electrode width: 292 μm, electrode gap: 8 μm)
m), orientation control film 7 (polyimide, film thickness: 100 nm)
And a transparent electrode 11 (ITO) on a glass substrate 10 (soda glass, plate thickness: 0.7 mm).
Film, film thickness: 260 nm, electrode width: 92 μm, electrode gap:
8 μm), orientation control film 12 (polyimide, film thickness: 100
The other electrode substrate on which is laminated the liquid crystal composition (a liquid crystal composition comprising a cyano PCH and a tran derivative) is disposed between the glass substrates by interposing a spacer material 13 (particle diameter: 6 μm) of polymer beads. , A liquid crystal thickness: 6 μm, and a twist angle: 250 °).
3, a reflection type color liquid crystal display device including phase plates 20, 21 and a polarizing plate 22.

In particular, according to the present embodiment, the reflection film in the portion corresponding to the light shielding layer is blackened by the sulfuration treatment so that an unnecessary step is not formed on the surface of the reflection film, so that the light blocking function is imparted to the non-opening portion. This is advantageous for flattening the surfaces of the colored layers 5a, 5b, 5c, and can provide a reflective color liquid crystal display device that can display bright, high-contrast images.

Further, according to this embodiment, the resin layer, the reflection film and the coloring layer serving as the base layer for the diffuse reflection plate are integrated on one glass substrate, so that the other glass substrate has a high definition. Since a high signal electrode can be formed directly on a glass substrate, there is an effect of improving the production yield of a liquid crystal element.

Further, a TCP equipped with a liquid crystal driving IC
Is easy to mount and correct, and has the effect of improving the production yield of liquid crystal elements.

In this embodiment, the thickness of the reflective film is 1
The portion corresponding to the light-shielding layer was blackened by sulfuration treatment using silver of 00 nm to provide a light-shielding function, but the material of the reflection film and the blackening method can be selected according to the purpose.

Although not shown, the use of a flattening layer between the reflective film and the colored layer or between the colored layer and the transparent electrode is optional according to the purpose.

In this embodiment, the diffuse reflection plate and the color filter are formed on the same substrate. However, even when the diffuse reflection plate and the color filter are formed on separate substrates, the brightness is slightly lowered. Similar characteristics are obtained.

Embodiment 3 Next, an example of another reflection type liquid crystal display device of the present invention will be described with reference to the schematic sectional view of FIG.

Step (a): A polymer film 15 (polyethylene terephthalate, film thickness: 50 μm, pitch of concave portions: approximately 15) serving as a support having a large number of concave portions formed on the surface.
μm, recess depth: 1.2 μm), a black resin layer 2 made of an acrylic resin in which a black pigment or carbon is dispersed.
(Epoxy resin or imide resin is also acceptable.
The black resin layer 2 is coated with a photosensitive or non-photosensitive resin (thickness: 1.5 μm), dried, and then protected on the black resin layer 2 (not shown, polyethylene, thickness: 6 μm).
A transfer film provided with is prepared.

The transfer film was applied to a glass substrate 1 (soda glass, plate thickness: 0.7 mm) on a roll laminator 18 (substrate temperature: 100 ° C., roll temperature: 100 ° C., roll pressure:
6 kg / cm ² , feed speed: 0.5 m / min)
Next, main curing (240 ° C./30 minutes) is performed, and the polymer film is peeled off to form a black resin layer 2 having a large number of convex portions.

Step (b): On the black resin layer 2 having a large number of convex portions, an aluminum reflective film layer 3 (silver can be used, film thickness:
100 nm).

Step (c): After forming a photosensitive resin layer 4 (thickness: 1.5 μm) on the reflective film layer 3, the photosensitive resin layer 4 is exposed to ultraviolet rays 17 via a photomask 16. I do. Step (d): developing the photosensitive resin layer 4 under predetermined developing conditions, and electrode / reflection film layer 25 corresponding to the colored layer (electrode / reflection plate pitch: 100 μm, electrode / reflection plate width: 88 μm,
An electrode / reflector gap: 12 μm) is formed.

Step (e): Alignment control 7 (polyimide, film thickness: 70) having a flattening function on the electrode / reflection film layer 25 so as to eliminate irregularities on the surface of the electrode / reflection film layer 25.
nm).

Step (f): A photosensitive colored resin layer 5a is formed on one of the electrode substrates formed by the above (a) to (e) and a glass substrate 10 (soda glass, plate thickness: 0.7 mm) by a predetermined method. By developing under development conditions, a colored layer 5a (film thickness: 1.2 μm) of any of red, green and blue (yellow, cyan and magenta is also possible) is formed.

Step (g): By repeating the same steps as for the colored layer 5a, the colored layer 5b (film thickness: 1.2 μm)
m) and 5c (film thickness: 1.2 μm).

Step (h): The colored layers 5a, 5b, 5c
A transparent electrode 6 (ITO, film thickness: 260 nm, number of electrodes:
240 lines, electrode pitch: 300 μm, electrode width: 288 μ
m, the interelectrode gap: a scanning electrode of 12 μm) and the other electrode substrate on which the alignment control film 12 (polyimide, film thickness: 70 nm) is formed, are arranged such that the transparent electrodes 6 and 11 face each other, They are combined via a spacer material 13 (particle diameter: 6 μm) of polymer beads corresponding to the thickness of the liquid crystal layer 14.

Next, both electrode substrates are sealed with a sealing material in which polymer beads (silica beads or the like can also be used) mixed with an epoxy resin formed around the substrate, and a liquid crystal 14 (cyano PCH and transformer) is filled between the electrode substrates. A liquid crystal composition comprising a derivative, anisotropy of refractive index (n: 0.133, twist angle: 250 °) is filled and sealed (photosensitive acrylic resin or photosensitive epoxy resin) to form a reflective color liquid crystal display device. Produced. Further, as shown in the figure, predetermined phase plates 20, 21 and a polarizing plate 22 were arranged on the glass substrate 10 of the reflection type color liquid crystal display device, thereby producing a reflection type color liquid crystal display device.

Further, as shown in FIG. 3, the reflection type color liquid crystal display element is mounted on a tape carrier package having a liquid crystal driving IC mounted thereon or a printed circuit board provided with a power supply circuit, a control circuit, and the like. Type color liquid crystal display device was manufactured.

According to this embodiment, the reflection film is patterned so that the electrode and the reflection plate can be used together, and the resin layer serving as the base layer of the diffusion reflection plate has a light-shielding function, thereby eliminating the need for the light-shielding film. It is possible to provide a low-cost reflective color liquid crystal display device capable of displaying bright and high contrast.

In particular, since the aperture ratio which determines the brightness is determined by the patterning accuracy of only the transparent electrode and the electrode / reflection plate which are relatively easy to pattern, the bright type and high contrast display can be easily achieved. A color liquid crystal display device can be provided.

Although no flattening layer was formed between the colored layers 5a, 5b, 5c and the transparent electrode 6 or between the electrode / reflection plate 25 and the orientation control film 7, the use of the flattening layer depends on the display system or the like. It is optional according to the purpose.

Further, the coloring layer is not formed by the spin coating method.
If a transfer film or a printing method is used, the number of manufacturing steps can be significantly reduced, and the surface of the coloring layer can be formed more flat, which is advantageous for low cost and high contrast.

However, in this embodiment, the diffuse reflection plate and the color filter are formed on different substrates. However, even when the diffusion reflection plate and the color filter are formed on the same substrate, the same characteristics as in the embodiment can be obtained.

Embodiment 4 Next, an example of another reflection type liquid crystal display device of the present invention will be described with reference to the schematic sectional view of FIG. As shown in the figure, a glass substrate 1 (soda glass,
The reflective film 3 (silver, film thickness: 100 nm, thickness: 0.7 mm)
Size: 288 μm × 88 μm, gap: 12 μm), light-shielding layer 24 (silver sulfurized portion, film thickness: 100 nm, width: 12)
μm), coloring layers 5a, 5b, 5c (pigment type, film thickness:
1.2 μm, width: 100 μm), transparent electrode 6 (ITO film,
Film thickness: 260 nm, electrode width: 292 μm, electrode gap: 8
μm), orientation control film 7 (polyimide, film thickness: 100 nm)
And a transparent electrode 11 (ITO) on a glass substrate 10 (soda glass, plate thickness: 0.7 mm).
Film, film thickness: 260 nm, electrode width: 92 μm, electrode gap:
8 μm), orientation control film 12 (polyimide, film thickness: 100
The other electrode substrate on which is laminated the liquid crystal composition (a liquid crystal composition comprising a cyano PCH and a tran derivative) is disposed between the glass substrates by interposing a spacer material 13 (particle diameter: 6 μm) of polymer beads. , A liquid crystal thickness: 6 μm, and a twist angle: 250 °).
3, a reflection type color liquid crystal display device including phase plates 20, 21 and a polarizing plate 22.

In particular, since the light-shielding layer 24 is formed by blackening the portion of the reflective film 3 corresponding to the non-opening portion with a hydrogen sulfide solution using a photolithography technique, no step is formed on the surface of the reflective film. Colored layer 5 formed on reflective film 3
It is possible to provide a reflective color liquid crystal display device in which the surfaces of a, 5b, and 5c are flat, and a high-contrast, uniform display image can be obtained even with an element structure in which the flattening layer is removed.

Further, according to this embodiment, since the reflection film and the coloring layer are concentrated on one glass substrate side, a high-definition signal electrode can be directly formed on the other glass substrate on the glass substrate. This has the effect of improving the production yield of liquid crystal elements.

Further, a TCP mounted with a liquid crystal driving IC
Is easy to mount and correct, and has the effect of improving the production yield of liquid crystal elements.

In this embodiment, the thickness of the reflection film is 1
Although the hydrogen sulfide solution was used as the silver and blackening treatment material of 00 nm, the reflection film material and the treatment material can be selected according to the purpose.

Although not shown in this embodiment,
The use of the flattening layer formed between the colored layers 5a, 5b, 5c and the transparent electrode 6 is optional according to the purpose.

In this embodiment, the diffuse reflection plate and the color filter are formed on the same substrate. However, the same characteristics as those of the embodiment can be obtained when the diffusion reflection plate and the color filter are formed on different substrates.

Embodiment 5 Next, an example of another reflection type liquid crystal display device of the present invention will be described with reference to the schematic sectional view of FIG. As shown in the figure, a glass substrate 1 (soda glass,
Electrode / reflection film 25 (aluminum, 0.7 mm)
Film thickness: 100 nm, number of electrodes: 1920, electrode width: 92
μm, electrode gap: 8 μm), light shielding layer 24 (pigment black, film thickness: 100 nm, line width: 12 μm), alignment control film 7
(Polyimide, film thickness: 100 nm) laminated on one electrode substrate and a glass substrate 10 (soda glass, plate thickness:
0.7 mm), colored layers 5a, 5b, 5c (pigment type, film thickness: 1.2 μm, width: 100 μm), transparent electrode 6 (ITO
Film, film thickness: 260 nm, number of electrodes: 480, electrode width: 2
92 μm, electrode gap: 8 μm, and the other electrode substrate on which the orientation control film 12 (polyimide, film thickness: 100 nm) is laminated, is used as a spacer material 13 of polymer beads (particle diameter: 6 μm).
m), and a liquid crystal 14 is interposed between the glass substrates.
(A liquid crystal composition comprising a cyano PCH and a tolan derivative, liquid crystal thickness: 6 μm, twist angle: 250 °).
This is a reflection type color liquid crystal display device provided with a predetermined light scattering plate 23, phase plates 20, 21 and a polarizing plate 22 on 0.

In particular, in the present embodiment, the metal electrode also serves as a reflector so that the aperture ratio which affects the brightness is determined only by the patterning accuracy of the metal electrode / reflector 25 and the transparent electrode 6. Therefore, it is possible to provide a reflective color liquid crystal display device that can obtain a bright and high-contrast image.

Further, according to the present embodiment, in forming the light-shielding layer 24 provided in the gap between the metal electrode / reflection plate 25, ultraviolet rays are applied from the glass substrate 1 side using the metal electrode / reflection plate 25 as a photomask. Since the surface of the alignment control film 7 can be flattened by using a so-called back exposure method for exposing, a reflective color liquid crystal display device capable of obtaining a bright and high-contrast image can be provided.

Further, according to this embodiment, a colored layer and a scanning electrode having a small number of electrodes are formed on one glass substrate side, and a signal electrode having a high definition and a large number of electrodes is formed on the other glass substrate. Since it can be formed directly on the substrate, it has the effect of improving the production yield of liquid crystal elements.

Further, it is easy to mount and correct the TCP on which the liquid crystal driving IC is mounted, and there is an effect of improving the production yield of the liquid crystal element.

In this embodiment, aluminum having a thickness of 100 nm is used as the electrode / reflection plate 25 and a photosensitive resin in which a black pigment having a thickness of 100 nm is dispersed is used as the light shielding layer. The material of the layer and the like can be selected according to the purpose. Although not shown in this embodiment, the use of a flattening layer between the electrode / reflection plate 25 and the alignment control film 7 or between the coloring layers 5a, 5b, 5c and the transparent electrode 6 is optional according to the purpose. It is.

[0076]

According to the present invention, it is possible to (1) not only pattern the reflection layer of the diffuse reflection plate so as to correspond to the dot size of the color filter, but also blacken the resin layer having irregularities under the reflection layer. By doing
Since unnecessary light reflected from the non-opening portion can be removed by absorbing light incident on the non-opening portion, a reflective color liquid crystal display device that can obtain a high-contrast image can be provided.

(2) In addition to patterning the reflection layer of the diffuse reflection plate so as to correspond to the dot size of the color filter, the resin layer having unevenness under the reflection layer is provided with a light-shielding function, so that the reflection is reduced. Since a reflective color liquid crystal display element having a high aperture ratio and requiring no light-shielding layer formed on the layer can be manufactured, a reflective color liquid crystal display device that can obtain a bright and high-contrast image can be provided.

(3) Since the diffuse reflection plate and the color filter are formed on the same substrate, the signal electrodes with high definition can be directly formed on the other glass substrate.
A low-cost reflective color liquid crystal display device capable of manufacturing a liquid crystal display element with a high yield of modification and mounting of a TCP mounted with an electrode forming and liquid crystal driving IC and obtaining a high contrast and bright image can be provided. .

(4) The reflection layer of the diffuse reflection plate is patterned so as to correspond to the dot size of the color filter to form a strip-shaped reflection layer only in the portion corresponding to the opening, and to reflect light in the reflection layer gap. By providing a light-shielding film having substantially the same thickness as the film, unnecessary reflected light from non-opening portions can be significantly reduced, so that a reflective type color liquid crystal display device capable of obtaining a bright image with high contrast can be achieved at low cost. .

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a manufacturing process of a reflective color liquid crystal display element of Example 1.

FIG. 2 is a schematic cross-sectional view illustrating a configuration of a reflective color liquid crystal display element of Example 1.

FIG. 3 is a schematic sectional view showing a configuration of a reflective color liquid crystal display device of the present invention.

FIG. 4 is a schematic top view showing details of a pixel portion in the reflective color liquid crystal display element of Example 1.

FIG. 5 is a schematic cross-sectional view illustrating a configuration of a reflective color liquid crystal display element of Example 2.

FIG. 6 is a schematic cross-sectional view illustrating a configuration of a reflective color liquid crystal display element of Example 3.

FIG. 7 is a schematic cross-sectional view illustrating a configuration of a reflective color liquid crystal display element of Example 4.

FIG. 8 is a schematic cross-sectional view showing a configuration of a reflective color liquid crystal display element of Example 5.

[Explanation of symbols]

1, 10: glass substrate, 2: resin layer, 3: reflective film, 4:
Photosensitive resin, 5a, 5b, 5c: colored layer, 6, 11: transparent electrode, 7, 12: orientation control film, 13: spacer material, 1
4: liquid crystal, 15: polymer film, 16: photomask, 17: ultraviolet light, 18: laminator, 19: flattening layer, 20, 21: phase plate, 22: polarizing plate, 23: light scattering plate, 24: light shielding Layer, 30... Reflective color liquid crystal display element,
31: Tape carrier package, 32: Power supply circuit and control circuit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiro Kuwahara 7-1-1, Omikacho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Osamu Ito 7-1, Omikamachi, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Hitachi Research Laboratory (72) Inventor Katsumi Kondo 7-1-1, Omika-cho, Hitachi City, Ibaraki Pref. Hitachi Ltd. Hitachi Research Laboratory F-term (reference) 2H091 LA30 5C058 AA06 AB01 BA05 BA08

Claims (6)

[Claims] 1. A resin layer in which a plurality of convex portions or irregular portions are randomly arranged on a glass substrate, and a reflective layer, a coloring layer, a transparent electrode, and an orientation control film are sequentially laminated on the resin layer. The formed one electrode substrate and the other electrode substrate on which a transparent electrode and an orientation control film are laminated on a glass substrate are arranged so that the orientation control films face each other, and the gap between the two electrode substrates is provided. A reflective liquid crystal display device, characterized in that the resin layer is colored and the reflective layer is formed only in a portion corresponding to an opening. 2. A reflection type color liquid crystal display device wherein the resin layer is colored black. 3. A reflective color liquid crystal display device wherein the optical density of the black resin layer is 3 or less. 4. A resin layer in which a plurality of projections or irregularities are randomly arranged on a glass substrate, and an electrode / reflection layer and a planarization layer / orientation control film are sequentially laminated on the resin layer. One electrode substrate formed, one electrode substrate on which a colored layer, a transparent electrode, and an orientation control film are sequentially laminated, and a colored layer, a planarization layer, a transparent electrode, and an orientation control film laminated on a glass substrate A reflection type color liquid crystal display device, wherein an alignment control film is arranged to face the other electrode substrate, and a liquid crystal layer is filled in a gap between the two electrode substrates. 5. A reflective color liquid crystal display device wherein the resin layer is colored black. 6. A reflective color liquid crystal display device wherein the optical density of the black resin layer is 3 or less.