JPH1062771A - Color filters for liquid crystal display and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide color filters for liquid crystal display suitable for an enlarged screen and a manufacturing method therefor which allow transparent electrodes formed on a glass substrate to be decreased in resistance at inexpensive costs. SOLUTION: This color filter forms patterns of color filter layers 12 (R, G, B) of three colors, red (R), green (G), blue (B) which become picture elements on a glass substrate 11, forming black matrix layers 13 between the color filter layers 12 (R, G, B), and forming transparent electrode layers 14 on the color filter layers 12 (R, G, B). In this case, the black matrix layers 13 are composed of a conductive film, and are provided with a space 15 between the patterns in a same direction parallel with the transparent electrode layers 14, to be formed into patterns electrically insulated from each other, and the insulated patterns are electrically connected with each corresponding transparent electrode layer 14. Since the conductive black matrix layers 13 are electrically connected with the transparent layers 14, the resistance becomes low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color filter provided on a glass substrate of a color liquid crystal display and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, liquid crystal display devices have been developed mainly for small display means such as table-top equipment, but recently, with the demand for color display, large screen and high definition, the glass display has been developed. The resistance of the transparent electrode due to the ITO film formed on the substrate tends to be high. Therefore, especially in a simple matrix liquid crystal STN (Super Twisted Nematic) system or the like, there is a problem that image quality is deteriorated due to occurrence of crosstalk or the like. was there. On the other hand, a structure in which the thickness of the transparent electrode is increased or an auxiliary electrode is formed along the transparent electrode to reduce the resistance has been studied. In addition,
Color filters used in color liquid crystal display devices include:
Has the function of blocking unnecessary light in areas other than the pixel electrode,
A lattice-shaped black matrix layer is formed to obtain high contrast.

[0003]

However, increasing the thickness of the transparent electrode using a conventional ITO film to reduce the resistance increases the level difference on the glass substrate.
There are drawbacks in that the film formation in the subsequent process is hindered, the transmittance is reduced, and the cost is increased. Further, the structure in which the auxiliary electrode is formed along the transparent electrode has a disadvantage that the aperture ratio is reduced and the cost is increased.

Accordingly, an object of the present invention is to provide a color filter for a liquid crystal display, which can reduce the resistance of a transparent electrode formed on a glass substrate at low cost and is suitable for a large screen, and a method of manufacturing the same.

[0005]

In order to achieve the above object, a color filter for a liquid crystal display of the present invention comprises three colors of red (R), green (G) and blue (B), which are pixels on a glass substrate. A color filter layer is formed in a pattern, a black matrix layer is formed between the color filter layers, and a transparent electrode layer is formed on the color filter layer. Formed in a pattern that is electrically insulated from each other by providing a gap between patterns in the same direction parallel to the transparent electrode layer, and electrically connecting the transparent electrode layers respectively corresponding to the insulated pattern. It is characterized by being connected. By electrically connecting the black matrix layer of a pattern made of a conductive film and electrically insulated from each other to the transparent electrode layer, the resistance can be reduced at low cost.

The method of manufacturing a color filter for a liquid crystal display according to the present invention is also directed to a black matrix layer in which a conductive film is formed on a glass substrate so as to form gaps between patterns in the same direction and form insulated patterns from each other. Forming a color filter layer between the insulated patterns of the black matrix layer, and forming a color filter layer of three colors of red (R), green (G), and blue (B) as pixels. Forming a transparent electrode layer on the layer and forming a transparent electrode layer electrically connected to the insulated pattern.
Since the connection with the transparent electrode layer is made at all points between the color filter layers, electrical connection is ensured. Further, the black matrix layer is composed of a black film formed on a glass substrate and a conductive metal film formed by firing paste on the black film. preferable.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the illustrated embodiments. FIG. 1 is a cross-sectional view illustrating a liquid crystal display color filter according to an embodiment of the present invention, and FIG. 2 is a plan view illustrating a liquid crystal display color filter according to an embodiment of the present invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. 2, and in FIG. 2, a solid line in which a black matrix layer is hatched, a color filter layer is indicated by an alternate long and short dash line, and a transparent electrode layer is indicated by a dotted line ( Hereinafter, the same applies to FIG. 4).

In these figures, a color filter 10 for a liquid crystal display according to the present embodiment comprises a color filter layer 12 of three colors of red (R), green (G) and blue (B) formed on a glass substrate 11. (R, G, B), a black matrix layer 13 formed in a lattice between the color filter layers 12 (R, G, B), and a color filter layer 12 (R, G, B).
G, B) Transparent electrode layer 1 formed in stripes on
4 and the black matrix layer 13
Is a conductive metal film 1 such as gold (Au) on a chromium (Cr) film 13a having conductivity, for example, a black film.
3b is formed, and a gap 15 is provided between patterns in the same direction parallel to the transparent electrode layer 14 to form electrically insulated patterns, and the transparent electrodes respectively corresponding to these insulated patterns are formed. It has a structure in which the layers 13 are electrically connected.

FIG. 3 is a view for explaining a process of manufacturing a color filter for a liquid crystal display according to an embodiment of the present invention.

First, as shown in FIG. 3A, a chromium (Cr) film 13a having a thickness of, for example, about 1000 ° is formed on a glass substrate 11 by a vacuum deposition method or a sputtering method. As shown in FIG.
A conductive metal film 13b made of a material such as gold (Au), silver (Ag), nickel (Ni), copper (Cu), and aluminum (Al) is formed on the layer 3a to a thickness of about 1000 °. The conductive metal film 13b is formed by a vacuum deposition method or a plating method, but is formed at low cost with good adhesion by using a baked paste. For example, in the present embodiment, it is formed by applying a fired paste of gold to the chromium film 13a to a predetermined required film thickness and performing a high temperature treatment of about 300 to 580 ° C.

Next, as shown in FIG. 3C, the chromium film 13a and the conductive metal film 13b are etched using a photoresist as a mask to form a lattice pattern as the black matrix layer 13. This pattern is, for example, as shown in FIG.
Small gaps 15 are provided between patterns in the same direction parallel to 4 to form electrically insulated patterns.

Next, as shown in FIG. 3 (d), three colors of red (R), green (G) and blue (B), which are pixels, are provided between the lattice patterns of the lattice matrix black matrix layer 13. The color filter layer 12 (R, G, B) is formed to a normally required thickness by, for example, a dispersion method, a dyeing method, a printing method, an electrodeposition method, or the like. Here, the pattern arrangement of red (R), green (G), and blue (B) includes, for example, various types such as a mosaic type, a triangle type, and a stripe type. In the present embodiment, the pattern is formed in a stripe type.

Next, as shown in FIG. 3E, on the transparent electrode layer 13 and the color filter layer 12 (R, G, B), for example, an ITO film or the like having a thickness of about 4000.degree. A transparent electrode layer 14 made of
As shown in (f), a pattern is formed in a stripe shape. As a result, the striped transparent electrode layers 13 formed on the color filter layers 12 (R, G, B) are formed of a conductive metal film having a mutually insulated pattern of the black matrix layers 13 formed in the same direction. 12b is electrically connected.

A color filter 10 for a liquid crystal display having the above-described structure.
According to the method, the black matrix layer 13 formed between the color filter layers 12 (R, G, B) is
3a and a conductive metal film 13b made of gold or the like, and a gap 15 is provided between patterns in the same direction parallel to the transparent electrode layer 14 formed in a stripe shape to form a pattern electrically insulated from each other; By electrically connecting the transparent electrode layers 14 respectively corresponding to the insulated patterns, the resistance is reduced because the black matrix layers 13 having a low resistance value are provided in parallel on the transparent electrode layers 14. In this embodiment, the resistance value of the conventional transparent electrode layer alone is, for example, about 4 Ω / cm 2, but the resistance is reduced to about 1 Ω / cm 2 even when the film thickness is the same as the conventional one. Now you can. Here, the black matrix layer 13 has gaps 15 between the patterns, and the gaps 15 may be small enough to electrically insulate.
There is no problem in the function to obtain high contrast. Further, according to the manufacturing method of the present embodiment, the black matrix layer 1
3 is a chrome film 13a and a conductive metal film 13b such as gold.
Since the conductive metal film 13b is formed of a baked paste such as gold, the molding is simple and inexpensive, and the connection with the transparent electrode layer 14 can be made with the color filter layer 12 (R, R).
G, B), so that electrical connection is ensured. Therefore, even if the transparent electrode layer 14 is formed to the same thickness as the conventional one, by connecting to the conductive black matrix layer 13, the resistance can be reduced at low cost, and the transmittance is reduced. A color filter for a liquid crystal display suitable for a large screen can be manufactured without reducing the aperture ratio.

FIG. 4 is a plan view illustrating a color filter for a liquid crystal display according to another embodiment of the present invention, and FIG.
It is a line sectional view. The parts corresponding to those in the above-described embodiment are denoted by the same reference numerals.

In the color filter 20 for a liquid crystal display of this embodiment, the color filter layers 12 (R, G, B) are formed in a striped pattern in a direction perpendicular to the transparent electrode layer 14, and are the same as in the previous embodiment. A black matrix layer 21 made of a chromium film 21a and a conductive metal film 21b such as gold is provided with a gap 22 of another shape between patterns in the same direction parallel to the transparent electrode layer 14 and electrically insulated from each other. And the transparent electrode layers 13 respectively corresponding to these insulated patterns are electrically connected. The gap 22 is formed in a shape in which an elongated rectangular notch is provided at a portion corresponding to a grid-like intersection.

The liquid crystal display color filter 20 having the above-described structure.
According to the above, by connecting the transparent electrode layer 14 to the conductive black matrix layer 13 in the same manner as in the above embodiment, it is possible to lower the resistance at low cost, reduce the transmittance, or reduce the aperture ratio. A color filter for a liquid crystal display suitable for a large screen can be manufactured without lowering.
In this embodiment, the gap 22 is formed into a shape in which an elongated rectangular notch is provided at a portion corresponding to the grid-like intersection, so that insulation can be ensured and a pixel for obtaining high contrast can be obtained. Can be reduced.

In the above embodiments, the black matrix layers 13 and 21 are formed of the chromium films 13a and 21a and the conductive metal films 13b and 21b such as gold, but at least the function as the black matrix is provided. It is sufficient that the conductive metal film is formed from a conductive film, for example, a conductive metal film may be formed on a resin black film as a black film, or a conductive metal film instead of a two-layer film or a multilayer film. It may be formed. In addition, gaps 15 and 22
The shape is not limited to the embodiment as long as insulation between the patterns is reliably performed and the shape does not affect the pixels.

Although the preferred embodiment of the present invention has been described, various modifications and changes can be made without departing from the spirit of the present invention.

[0020]

As described above, the color filter for a liquid crystal display of the present invention comprises a conductive film, and electrically connects the black matrix layers in a pattern electrically insulated from each other to the transparent electrode layer. Thus, the resistance of the transparent electrode layer can be reduced at low cost, and a large screen can be realized.

In the method of manufacturing a color filter for a liquid crystal display according to the present invention, the black matrix layer is formed of a conductive metal film, and the connection with the transparent electrode layer is performed at all portions between the color filter layers. Connection is ensured. Further, if the black matrix layer is formed from a conductive metal firing paste, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a color filter for a liquid crystal display according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a color filter for a liquid crystal display according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a process for manufacturing a color filter for a liquid crystal display according to an embodiment of the present invention.

FIG. 4 is a plan view illustrating a color filter for a liquid crystal display according to another embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 Reference Signs List 10 color filter for liquid crystal display 11 glass substrate 12 color filter layer 13 black matrix layer 13a chrome film 13b conductive metal film 14 transparent electrode layer 15 gap 20 liquid crystal display color filter 21 black matrix layer 21a chrome film 21b conductive metal film 22 Gap

Claims (3)

[Claims] A color filter layer of three colors of red (R), green (G), and blue (B), which are pixels, is formed on a glass substrate, and a black matrix layer is formed between the color filter layers. In a color filter for a liquid crystal display having a transparent electrode layer formed on the color filter layer, the black matrix layer is made of a conductive film, and is provided with a gap between patterns in the same direction parallel to the transparent electrode layer. A color filter for a liquid crystal display, wherein the transparent electrode layers are formed in a pattern insulated from each other, and the transparent electrode layers respectively corresponding to the insulated pattern are electrically connected. 2. A step of forming a black matrix layer on a glass substrate by forming a gap between patterns in the same direction in a grid pattern using a conductive film to form an insulated pattern from each other; Forming a color filter layer of three colors of red (R), green (G), and blue (B) as pixels between the formed patterns, forming a transparent electrode layer on the color filter layer, Forming a transparent electrode layer electrically connected to the insulated pattern. 3. The liquid crystal according to claim 2, wherein said black matrix layer comprises a black film formed on a glass substrate, and a conductive metal film formed on said black film by a firing paste. Manufacturing method of display color filter.