JPH04295802A - Production of color filter - Google Patents

Abstract

PURPOSE:To prevent the formation of colored layers by previously providing resin layers on transparent electrode parts where the colored layers are undesirable in the case of formation of the colored layers (color filter layers) by a wet electrolysis method on a substrate disposed with the transparent electrodes of prescribed patterns. CONSTITUTION:The resin layers are previously selectively formed in the electrode parts to constitute panel sealing parts 3 and the part to constitute packaging parts 4 for liquid crystal driving ICs in a liquid crystal panel forming stage which is a post stage and the colored layers are formed by the wet electrolysis method. The method for preventing the film formation in the parts where the formation of the colored layers is undesirable is provided by the method easy in terms of production technology.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to color filters used in liquid crystal displays, and more particularly to the production of color filters by wet electrolysis.

0002

[Prior Art] A color filter is produced by colloidally dispersing an organic pigment in a micellar aqueous solution of a redox-reactive surfactant, and then depositing the organic pigment on a substrate by electrolysis in the micellar aqueous solution to form a colored layer. We filed a patent application regarding this (Japanese Patent Application Laid-Open No. 2-24603).

This color filter has the advantage that the transparent electrode (ITO or the like) on the substrate used for electrolytically forming the colored layer can be used as is for driving the liquid crystal. On the other hand, in the production of this color filter, it is basically immersed in an electrolytic solution, and organic pigments are deposited on all parts where electricity is applied, forming a colored layer.

0004

[Problems to be Solved by the Invention] In the above-mentioned prior art, an energized electrode (ITO) on a substrate immersed in an electrolyte
etc.) A colored layer is formed on everything. That is, since a colored layer would be formed in an undesirable area, the following problem occurred when a liquid crystal panel was manufactured using this color filter.

(1) If there is a colored layer in the seal part that is attached to the counter substrate, the adhesion of the seal will be insufficient, making it impossible to ensure the reliability of the panel, and there will be a seal gap between the part with the colored layer and the part without it. It becomes non-uniform and the display performance deteriorates. (2) When a colored layer is formed on the terminal electrode portion where the liquid crystal driving IC is finally mounted, the IC cannot be mounted unless the colored layer in this portion is removed in a subsequent process. In this case, it is possible to leave the mounting terminal electrode part outside the liquid and form a colored layer only on the parts that originally require a colored layer, but this requires strict control of the liquid level at which the board is immersed, etc. Technically it is not easy.

[0006] As described above, in the conventional technology, a colored layer is formed in an unfavorable part, so the colored layer in that part is removed by tedious methods such as wiping or scraping during the panel forming process. had to be removed. Therefore, the present invention is intended to solve the above-mentioned problems, and its purpose is to prevent the formation of a colored layer on the panel seal part and the liquid crystal drive IC mounting part, which would be undesirable if a colored layer were formed. The present invention provides a method.

[0007]

[Means for Solving the Problems] The method for manufacturing a color filter of the present invention is a method for manufacturing a color filter for a liquid crystal panel in which a colored layer is formed by a wet electrolytic method, and the panel sealing is performed in the subsequent step of forming a liquid crystal panel. The method is characterized in that a resin layer is formed in advance on a predetermined portion of the color filter substrate that will become the part and the liquid crystal drive IC mounting part, and then a colored layer that will become the color filter is formed by a wet electrolytic method.

[0008] The resin only needs to ensure adhesion to the glass substrate serving as the color filter substrate and the transparent thin film electrode (ITO, tin oxide, etc.) during electrolysis;
It is sufficient if the coating can be selectively applied to desired areas by flexographic printing, screen printing, etc., or if it can be applied to the entire surface and then selectively formed into a film on desired areas using photolithography. The thickness of the formed film is not particularly limited, but for example, at least the resin of the liquid crystal drive IC mounting part needs to be removed before the IC is finally mounted. The thickness is preferably about 0.5 microns.

[0009]

EXAMPLES Example 1 A 30 cm square glass substrate shown in FIG. 1 was used as a color filter substrate for a liquid crystal panel. A transparent electrode 2 made of ITO is formed in a striped pattern on the glass substrate, and an ITO electrode is formed at one end of the pattern.
Patterns for C mounting and electrolysis are extracted. A resin layer was previously formed only in the shaded area in FIG. 1 for the purpose of preventing formation of a colored layer. This resin layer forming part is
It consists of a part 3 which will become part of a sealing part in the later process of forming a liquid crystal panel, and a liquid crystal driving IC mounting electrode part 4.

[0010] In forming the resin layer, it was selectively coated using flexo printing and cured at 150°C for 30 minutes. The film thickness was 0.1 micron. Acrylic resin (Optomer SS) manufactured by Japan Synthetic Rubber Co., Ltd. was used as the resin.

Next, using this substrate, a colored layer was formed by electrolysis. The colored layer was repeatedly electrolytically deposited three times using the three types of electrolytes shown in Table 1 so that the three primary colors of R, G, and B were alternately arranged in a stripe pattern. Electrolysis is +0.5V vs. S. C. E. It was conducted under the following conditions.

0012

[Table 1]

During film formation, the substrate is immersed in an electrolytic solution up to the part indicated by the dotted line 5 in FIG. Amorousness, 3
In the case of forming colored shades, the three primary colors R, G, and B were arranged in an alternating stripe pattern by selectively energizing only the electrodes indicated by 7 and 8, respectively. In addition, the substrate was washed with water after each color film was formed, and
It was dried at 0 degrees for 20 minutes.

[0014]Three colored layers of R, G, and B (film thicknesses of 0.8, 0.7, and 0.6 microns, respectively) were formed by the above operations, but the transparent electrode-like portions of the parts coated with resin in advance The object of the present invention was achieved without forming a colored layer.

On the other hand, a liquid crystal panel was manufactured using this color filter substrate. Although a 0.1-micron acrylic resin layer was present in the seal portion that was bonded to the counter substrate, the desired seal adhesion was ensured, and there were no problems in controlling the cell gap of the panel. In addition, the resin layer formed on the part where the liquid crystal drive IC will be finally mounted can be easily decomposed and removed by irradiating oxygen plasma after panel sealing, and there is no problem with I/O.
C implementation was completed.

(Example 2) Same as Example 1, but the resin layer was formed using photolithography. That is, after coating the entire surface of the substrate with a photosensitive acrylic resin by spin coating, it was selectively left only in portions 3 and 4 in FIG. 1 using photolithography. The film thickness was 0.2 microns.

A colored layer was formed in the same manner as in Example 1, but no colored layer was formed on the resin layer forming area. On the other hand, the 0.2 micron photosensitive acrylic resin layer present in the seal area did not cause any problems with the seal area, and the resin layer in the IC mounting area was exposed to oxygen plasma after sealing. It could be easily disassembled and removed, and IC mounting could be done without any problems.

[0018]

Effects of the Invention According to the present invention, it has become possible to provide a method of preventing the formation of a colored layer on undesirable areas when a colored layer is formed, using a method that is extremely easy in terms of production technology.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the present invention in an example.

[Explanation of symbols]

1 Color filter substrate 2 ITO transparent electrode 3 Resin coating part (panel seal part that crosses the electrode) 4 (IC mounting electrode part for liquid crystal drive) 5 Boundary line to be immersed in electrolyte solution

Claims (1)

[Claims] Claim 1: In a method for manufacturing a color filter for a liquid crystal panel in which a colored layer is formed by a wet electrolytic method, the colored layer is formed on a color filter substrate that becomes a panel seal part and a liquid crystal drive IC mounting part in a later process of forming a liquid crystal panel. A method for manufacturing a color filter, which comprises forming a resin layer on a predetermined portion in advance, and then forming a colored layer that will become a color filter by a wet electrolysis method.