JPH06194642A - Color liquid crystal display device and production of transparent electrode for the display - Google Patents

Abstract

PURPOSE:To widen a permissible range relating to alignment accuracy in a sticking stage and adhering stage while maintaining bright display quality by constituting the transparent electrodes in such a manner that the light shielding patterns of a substrate having color filters and a substrate opposing this substrate form grid-like light shielding patterns by intersecting orthogonally with each other when these substrates are disposed to face each other. CONSTITUTION:The substrate to be formed with the color filters is provided with striped light shielding layers 2. The color filters are so formed that the inter-color boundaries between light shielding patterns and the color filters overlap on each other. Such striped light shielding layers as to form the grid-like light shielding layers intersecting orthogonally with the light shielding patterns of the substrate on the color filter side when superposed on the substrate on the color filter side are provided on another substrate. As a result, high accuracy is no longer required for sticking and adhering in the case of a simple matrix and the accuracy necessary for alignment in an X- or Y direction is lowered even in the case of an active matrix system.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a color liquid crystal display device using a black matrix.

[0002]

2. Description of the Related Art In the prior art, attention has been paid to how to accurately align two substrates and how to bond them without misalignment.
In 8884, accurate alignment is performed by detecting the amount of light that passes through the alignment mark, and in JP-A-2-73229, a combination of a thermosetting sealant and an ultraviolet curable resin is used to bond with less misalignment. Are trying. In the simple matrix type monochrome liquid crystal display element, the overlay accuracy of the scanning electrode side substrate and the common electrode side substrate does not matter so much, but it becomes very important in color display. In a color liquid crystal display device, a color filter is formed on one substrate, and electrodes are formed on the color filter in accordance with the pattern of the color filter. In the color filter, a light-shielding layer called a black matrix is provided in order to prevent light leakage between adjacent electrodes and to improve visual clarity. Since the black matrix forms each dot in a grid pattern so as to be separated from each other, it is necessary to accurately align the electrodes on the counter substrate so that the electrodes on the counter substrate do not overlap the black matrix when superposing the counter substrate. Figure 1
Shows a conventional example of a color filter with a black matrix. In the figure, (a) is a sectional view, (b) is a plan view,
Reference numeral 1 is a coating layer, 2 is a light shielding layer, and 3 is a color filter element. In a general color liquid crystal display device, one pixel (330 × 330 μm) is divided into red (R), green (G), and blue (B). That is, the size of one dot is 110 × 330 μm, and the accuracy required for superposition is about ± 10 μm. In photolithography, alignment of about ± 10 μm is not very problematic, but in bonding substrates of a liquid crystal display device, alignment is performed with a certain distance between the substrates to seal the liquid crystal. Since the sealant is squeezed and pasted while adhering, it is easy to cause misalignment. Therefore, the bonding and the bonding are extremely difficult processes to manage.

[0003]

An object of the present invention is to provide a new structure of a color liquid crystal display device having a large tolerance of alignment accuracy in bonding and adhering substrates with transparent electrodes in manufacturing the color liquid crystal display device. Another object of the present invention is to provide a new method for producing a transparent electrode used in the device.

[0004]

[Constitution] According to the present invention, two transparent substrates having transparent electrodes are opposed to each other with a certain space therebetween, and liquid crystal is sealed between them.
In a color liquid crystal display device in which a color filter is provided on one of the substrates, each of the substrate having the color filter and the substrate facing the substrate has a stripe light-shielding pattern, and the two substrates are arranged to face each other. The present invention relates to a color liquid crystal display device, wherein the light-shielding patterns are orthogonal to each other to form a lattice-shaped light-shielding pattern. When the R, G, and B element patterns of the color filter are also stripe-shaped, it is preferable to use the simple matrix drive (usually the STN mode). In manufacturing the display device of the present invention, the transparent electrode can be patterned by performing exposure from the back surface using the stripe-shaped light shielding pattern as a mask. As shown in FIG. 2, the element pattern of the color filter includes a triangle (a), a mosaic (b), and a stripe (c), but it is said that the stripe pattern is suitable for a personal computer or a word processor display. There is. In the case of a stripe pattern, the color boundaries are linear, so
The alignment with the light-shielding pattern only needs to be in one direction. Therefore, the substrate on which the color filter is formed is provided with the light-shielding layer 2 having a stripe shape, not a lattice shape, and the color filter is formed so that the light-shielding pattern and the color boundary of the color filter overlap with each other (FIG. 3). And
A stripe-shaped light-shielding layer is provided on the other substrate so as to form a lattice-shaped light-shielding layer orthogonal to the light-shielding pattern of the color-filter-side substrate when superposed on the color-filter-side substrate. In this way, in the case of the simple matrix, high precision is not required for the bonding and the adhesion, and even in the case of the active matrix method, the alignment in the X or Y direction among the X, Y and θ directions can be performed. The accuracy required for is reduced. Further, by using the stripe-shaped light-shielding pattern, the transparent electrode can be patterned by self-alignment by backside exposure using this light-shielding pattern as a mask.

[0005]

【Example】

Example 1 A light-shielding layer having a stripe pattern with a line width of 20 μm and a pitch of 110 μm was formed on a glass substrate using a photosensitive resin in which a black pigment was dispersed. Subsequently, a photosensitive resin in which red, green, and blue pigments are dispersed so that color boundaries are present on the light-shielding pattern has a line width of 100 μm and a pitch of 330.
A color pattern of μm was formed. After coating the surface with an epoxy resin, an ITO film was deposited by sputtering, and the electrodes were aligned so that the electrodes were placed between the light-shielding patterns to form transparent electrodes with a line width of 90 μm and a pitch of 110 μm. Substrate creation). The other glass substrate is made of chrome with a line width of 30 μm and a pitch of 33.
After providing a 0 μm light-shielding pattern, a silicon dioxide film was deposited by sputtering. The active element T on this substrate
An FT and a transparent electrode were prepared (the above is the preparation of the substrate with TFT). Using these two substrates, the cell gap is 5μ
An m / TN mode active matrix color liquid crystal display device was prepared. Example 2 A light-shielding layer having a stripe pattern with a line width of 20 μm and a pitch of 330 μm was formed on a glass substrate using a photosensitive resin in which a black pigment was dispersed. After coating, align the electrodes so that they are between the light-shielding patterns.
A transparent electrode having a pitch of 0 μm and a pitch of 330 μm was provided (the above is the production of a substrate with an electrode and no active element). Using this substrate and a substrate with a color filter prepared in the same manner as in Example 1, a twist angle of 230 °, a cell gap of 6 μm, and an ST
An N-mode simple matrix system (STN mode) color liquid crystal display device was produced. Example 3 A glass substrate made of chromium with a line width of 20 μm and a pitch of 330 μm
After providing the light-shielding pattern, a silicon dioxide film was deposited by sputtering. ITO, which is a transparent electrode material, is formed on this substrate.
After forming a film and applying a resist, the entire surface was exposed from the back surface of the substrate to pattern the transparent electrode (the above is the production of the substrate with an electrode and no active element).
Using this substrate and a counter substrate with a color filter manufactured by the same method as in Example 1, a twist angle of 240 °,
A simple matrix type (STN mode) color liquid crystal display device having a cell gap of 5 μm and an STN mode was manufactured.

[0006]

[Effect] According to the present invention, while maintaining a clear display quality,
It was possible to widen the tolerance range regarding the positioning accuracy in the bonding process and the bonding process. Further, in the present invention, when forming the transparent electrode, by adopting a method of exposing from the transparent substrate side using the stripe-shaped light shielding pattern as a mask, it is possible to automatically determine the position in the patterning for forming the transparent electrode. It was Furthermore, in the present invention, unlike the generally used lattice-shaped light-shielding layer,
Since the light-shielding layer has a stripe shape, when this is used as a mask, the transparent electrode has an inverted pattern of the light-shielding layer, so that self-alignment patterning can be performed by backside exposure from the substrate using the light-shielding layer as a mask. This method can be realized because the light-shielding layer is divided into two substrates and each has a stripe shape.

[Brief description of drawings]

FIG. 1 shows a conventional color filter with a black matrix, in which (a) is a cross-sectional view thereof and (b) is a plan view thereof.

2A and 2B show types of element patterns of respective colors of a color filter, in which (a) is a triangle, (b) is a mosaic, and (c) is a stripe type.

FIG. 3 shows a positional relationship between a striped light-shielding pattern and an element pattern of each color of a color filter according to an embodiment of the present invention.

[Explanation of symbols]

 1 coating layer 2 light shielding layer 3 color filter element

Claims (3)

[Claims] 1. A color liquid crystal display device in which two transparent substrates having transparent electrodes are arranged to face each other with a constant gap, liquid crystal is sealed between them, and a color filter is provided on one of the substrates. Each of the substrate having the filter and the substrate facing the filter has a stripe-shaped light-shielding pattern, and when the two substrates are arranged to face each other, the light-shielding patterns are orthogonal to each other to form a lattice-shaped light-shielding pattern. A color liquid crystal display device characterized by. 2. A color liquid crystal display device in which two transparent substrates each having a transparent electrode are opposed to each other with a certain space therebetween, liquid crystal is sealed between them, and a color filter is provided on one of the substrates. Each of the substrate having an element pattern having a stripe-shaped color filter and a substrate facing the substrate has a stripe-shaped light-shielding pattern, and when the two substrates are arranged to face each other, the light-shielding patterns are orthogonal to each other and have a grid-like shape. A matrix type color liquid crystal display device characterized by forming a light-shielding pattern. 3. A method for producing a transparent electrode for a color liquid crystal display device, which comprises exposing from the substrate side to form a transparent electrode pattern using the stripe-shaped light-shielding pattern as a mask.