JPH08234160A - Color filter substrate for liquid crystal display panel and production of this color filter substrate - Google Patents

Abstract

PURPOSE: To provide a color filter substrate which has a simple structure, exhibits excellent performance and is producible at a low cost by constituting the substrate by arranging a transparent conductive film consisting of an org. material on a transparent substrate in such a manner that this film comes into contact with plural colored members varying in spectral characteristics. CONSTITUTION: A light shielding film 12 made of chromium is formed at a film thickness of 500Å on the glass substrate 11. The colored members (R, G, B) 13 which consists of pigment-contg. litho-coat resins and have the different spectral characteristic are formed respectively at a film thickness of 1.5μm thereon. In succession, the transparent conductive film 15 consisting of the org. material is formed on the colored members 13 to form electrodes for liquid crystal display. More specifically, a polyaniline film 15 which is an org. material is directly formed on the colored members 13 at a thickness of 100μm by using a printing method. The curing temp. of the polyaniline is <=200 deg.C. The resistivity of the polyaniline film 15 is as low as 5Ω.cm and the internal stress thereof is small and, therefore, the formation of the thick film is possible. As a result, the sheet resistance of the film attains the value as low about 500Ω/square and the film is usable as the counter electrode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter substrate for a liquid crystal display panel and a method for manufacturing the color filter substrate.

[0002]

2. Description of the Related Art In recent years, the research and development of a liquid crystal display panel as a flat display panel has continued to expand, and the market size of the liquid crystal display panel has greatly expanded.

The constituent materials of the liquid crystal display panel are roughly classified into a polarizing plate, a glass substrate, an alignment film, a liquid crystal material, a spacer, a color filter and the like. Among them, the color filter is relatively expensive. Therefore, it is said to be a key point for achieving a reasonably priced liquid crystal display panel.

A color filter for a liquid crystal display panel is composed of a large number of picture elements each having pixels of three primary colors of red, green and blue formed on a transparent substrate as one picture element. A light-shielding region is generally provided between each pixel in order to increase display contrast, and this light-shielding region is usually black, and is called a black matrix. An example of a conventional color filter substrate is disclosed in Japanese Patent Publication No. 2-1111. The color filter substrate disclosed in this publication is shown in FIG.
Shown in In FIG. 5, 101 is a transparent substrate, and 10
2 is a light-shielding area, and 103 is a colored resin. 104 is a transparent film, and 105 is a transparent electrode. That is, in FIG. 5, the transparent electrode 105 made of ITO is indirectly formed through the transparent film 104 formed on the colored resin 103 and functioning as a flattening film.

[0005]

However, since the color filter substrate shown in FIG. 5 has a relatively complicated structure and requires a complicated manufacturing process, the manufacturing cost becomes relatively high. However, there were the following inconveniences.

The above color filter substrate is a transparent substrate 1.
As 01, alkali-free glass or low-alkali glass is generally used. As the colored resin 103,
Generally, a photocurable pigment-containing resist is used. However, the adhesion between these materials is not very good.

As a method for improving this adhesion, the light-shielding film 102 made of chromium or chromium oxide is directly applied to the substrate 10.
1 and the colored resin 103 is formed thereon. Generally, chromium, chromium oxide, and colored resin 103
Adhesion with is good. However, in this case, in this method, the light shielding film 102 must be necessarily provided. However, depending on the liquid crystal display panel, the light shielding film 10
2 may not be provided on the color filter substrate side, but may be provided on the opposite side, for example, on the active matrix substrate side. In this case, the light-shielding film on the color filter substrate side becomes almost meaningless.

The reason why the pigment-containing resist is mainly used for the above-mentioned colored resin 103 is that the color filter needs a high heat resistant temperature. The ITO (Indium Tin Oxide) film generally used for the transparent electrode 105 has a film forming temperature of about 200 ° C., and the alignment film formed on the color filter has a similar baking temperature. Regarding the manufacturing process temperature of the liquid crystal display panel, there is a tendency to lower the temperature recently, but if the film forming temperature of the ITO film can be lowered, a wider range of colored resins can be used. In addition to this, further fine processing is possible by using a dyeing method or the like.

By the way, the reason why the ITO film 105 is not formed directly on the colored resin 103 is that the colored resin 103 is formed in three times by the normal photolithography method, and therefore the boundary between the colored members of R, G, and B is defined. This is because a slight difference in the film thickness causes a step difference, and the overlapping of the coloring members causes a rise.

In order to suppress the influence of such variation in thickness, in the color filter substrate shown in FIG. 5, a transparent film 104 as a flattening film is arranged between the transparent electrode 105 and the coloring member 103. However,
The flattening film 104 is generally composed of an organic thin film, and the film forming temperature of the ITO film cannot be set too high, and the film quality of the ITO film is deteriorated by the gas generated from the organic thin film during the film formation of the ITO film. It will be.

The present invention solves the above-mentioned technical problems to be solved, and provides a color filter substrate for a liquid crystal display panel, which has excellent performance even though it has a relatively simple structure and can be manufactured at low cost. Especially.

[0012]

Means and Actions for Solving the Problems The present invention has been made through intensive studies in order to solve the above problems, and has the constitution described below. That is, the color filter substrate for a liquid crystal display panel of the present invention comprises a transparent conductive film made of an organic material and functioning as a liquid crystal display electrode so as to come in contact with a plurality of colored members having different spectral characteristics provided on the transparent substrate. It is characterized by being arranged. The present invention also includes a method of manufacturing a color filter substrate.

According to the method of manufacturing a color filter substrate of the present invention, a transparent conductive film made of an organic material and functioning as a liquid crystal display electrode is provided so as to contact a plurality of coloring members provided on a transparent substrate and having different spectral characteristics. It is characterized by being placed.

According to the color filter substrate for a liquid crystal display panel and the method of manufacturing the color filter substrate of the present invention, the above technical problems are solved and the above objects are achieved.
In the present invention, I which is generally used for the transparent electrode is used.
By using the transparent conductive film made of an organic material instead of the inorganic film such as the TO film, the so-called flattening film becomes unnecessary. As a result, the manufacturing process temperature of the color filter substrate can be set low, and the coloring member forming the color filter can be selected from materials having a low heat resistant temperature. For example, when a resin containing a silane coupling material is used as the coloring member, the adhesion between the coloring member and the glass substrate is increased, and it is not necessary to dare to provide the chromium light shielding film that contributes to the adhesion. other than this,
For example, it becomes possible to form a dyeing resin having low heat resistance on a substrate without using fine patterning.

In the present invention, the manufacturing process is shortened by simplifying the structure of the color filter substrate, and as a result, the yield of the color filter substrate is improved.

[0016]

EXAMPLES The present invention will be described below with reference to specific examples, but the present invention is not limited thereto. The present invention also includes modifications and substitutions of the constituent elements with known techniques within the scope of achieving the object of the present invention.

Example 1 The color filter substrate shown in FIG. 1 was prepared. First, the light shielding film 12 made of chromium was formed on the glass substrate 11 to have a film thickness of 500 Å. Next, colored members (R, G, B) 13 each made of Ube Industries, Ltd. pigmented lithocoat resin and having different spectral characteristics are 1.5 μm each.
It was formed with a film thickness of. Then, a transparent conductive film 15 made of an organic material was formed on the colored member 13 to form an electrode for liquid crystal display.

Specifically, the coloring member 1 having a thickness of 100 μm is formed on the polyaniline film 15 which is an organic material by a printing method.
Formed directly on 3. Cure temperature of polyaniline is 20
It is 0 ° C or lower.

In this example, the polyaniline film 15 had a low resistivity of 5 Ω · cm and a small internal stress, so that the film could be made thick.

By thickening the polyaniline film,
The sheet resistance of the film was as low as about 500 Ω / □. Therefore, the polyaniline film of this example could be used as a counter electrode of a liquid crystal display panel.

Since this polyaniline film also has a flattening function, it is also effective as a passivation film. Furthermore, the hardness of the film surface is high, and it withstands the pressure of the gap material,
It was insoluble in the liquid crystal solvent. A polyamide resin or the like can be selected as the lithocoat resin.

In addition, the transparent conductive film made of an organic material is
It can also be made of polypyrrole, polythiophene, or the like. The coloring members having different spectral characteristics are not limited to R, G, and B, and can be appropriately selected.

Although the glass substrate is used in this example, the transparent substrate is not limited to this, and quartz glass, sapphire glass or the like can be appropriately selected.

Example 2 A color filter substrate of this example is shown in FIG. In this example, a color filter substrate was prepared in the same manner as in Example 1 except that the coloring member 23 made of gelatin was used and the light shielding film 12 was not provided. The coloring member 23 was formed with a thickness of 2 μm using a dyeing resin made of gelatin.

In this example, since the adhesion between the coloring member 23 and the glass substrate 11 is good, the light shielding film made of chromium is unnecessary. As a result, the aperture ratio of the liquid crystal display panel is no longer restricted. Further, since there is no step on the light-shielding film, the thickness of the resin 23 can be reduced, and the color filter can be further miniaturized. Instead of a gelatin resin, a resin used for a dyeing method such as casein can be adopted.

Example 3 A color filter substrate of this example is shown in FIG. In this example, a color filter substrate was produced in the same manner as in Example 2 except that the black matrix for light shielding was formed by the dyeing method using the photolithography method at the boundary portion between the R, G, and B coloring members. . The method for forming the black matrix is not limited to the dyeing method, and other methods such as an ion implantation method that can introduce a colorant or a color center into the resin can be adopted.

(Embodiment 4) FIG. 4 shows a color filter substrate of the present invention. In the color filter substrate of this example, a region 4 having improved hardness on the surface of the transparent conductive film 15 made of an organic material.
It was produced in the same manner as in Example 2 except that 6 was provided. In this example, the surface of the transparent conductive film 15 was modified by the plasma method to improve the hardness of the surface. By improving the hardness in this way, even when the gap material that constitutes the liquid crystal display panel comes into contact with the transparent conductive film with a strong force, it is not buried in the transparent conductive film, and an accurate liquid crystal cell is obtained. I was able to maintain the gap. Furthermore, by surface modification, the surface of the transparent conductive film can be made unnecessary with a specific solvent. For example, organic solvent resistance can be improved by performing a fluorine treatment.

[0028]

According to the present invention, the so-called flattening film is not necessary because the transparent conductive film made of an organic material is used for the transparent electrode. As a result, the manufacturing process temperature of the color filter substrate can be set low, and the coloring member forming the color filter can be selected from materials having a low heat resistant temperature. In the present invention, the manufacturing process is shortened by simplifying the structure of the color filter substrate, and as a result, the yield of the color filter substrate is improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a color filter substrate of the present invention.

FIG. 2 is a schematic view showing an example of a color filter substrate of the present invention.

FIG. 3 is a schematic view showing an example of a color filter substrate of the present invention.

FIG. 4 is a schematic view showing an example of a color filter substrate of the present invention.

FIG. 5 is a schematic view showing an example of a conventional color filter substrate.

Claims (4)

[Claims] 1. A transparent conductive film made of an organic material and functioning as a liquid crystal display electrode is disposed so as to contact a plurality of coloring members having different spectral characteristics provided on a transparent substrate. Color filter substrate for liquid crystal display panel. 2. A liquid crystal display comprising a transparent conductive film made of an organic material and functioning as a liquid crystal display electrode so as to be in contact with a plurality of coloring members having different spectral characteristics provided on a transparent substrate. Manufacturing method of panel color filter substrate. 3. The color filter substrate according to claim 1, wherein the transparent conductive film is made of polyaniline. 4. The method for manufacturing a color filter substrate according to claim 2, wherein polyaniline is used for the transparent conductive film.