JPH05288917A - Manufacture of color filter - Google Patents

Abstract

PURPOSE:To provide the manufacturing method for the color filter which is practically used by relatively easy repair. CONSTITUTION:This method is composed of a process wherein a colored ink film 13 is stuck on one surface of a light-transmissive substrate 11, a process wherein whether or not the colored ink film 13 has a defect or not is inspected, a process wherein the ink film surface in a specific area including the defect part 14 is coated with photosetting nontransparent resin 15 if the colored ink film 13 has the defect, a process wherein the nontransparent resin 15 at the defect part 14 is set by light irradiation from behind the substrate, and a process wherein the nontransparent resin except at the defect part is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color filter used in, for example, a liquid crystal display device,
In particular, it relates to a method for repairing defects in the colored color ink film.

[0002]

2. Description of the Related Art In the structure of a color liquid crystal display device, a color filter is arranged on one surface side across a liquid crystal layer. A printing method is one of the methods for manufacturing this color filter. This printing method is a method of printing a colored color ink dispersed in a pigment and a resin solvent in a dot shape or a stripe shape on the surface of a transparent glass substrate, and is a manufacturing method with low cost and high mass productivity. .. That is, first, a black light blocking layer is applied in a matrix on the surface of the glass substrate. Next, by the intaglio offset printing method equipped with a pressure transfer blanket, the transfer blanket is moved while rotating to a group of areas mainly on the transparent glass substrate where there is no light blocking layer, and a red colored ink film is formed. Are printed in stripes. Subsequently, a green colored ink film and then a blue colored ink film are printed on the adjacent region group having no light blocking layer.

[0003]

Although the color liquid crystal display device has several hundred thousand pixels, it is not easy to put each pixel of the color filter in the entire area of the screen into a defect-free color placement state. .. In actual mass production, for example, when a part of the surface of the glass substrate is in a state where the colored color ink is repelled, the ink film may not be completely attached and a defective portion may occur. Since the defective portion of the colored color ink is observed as a white bright spot by the backlight, it cannot be used even if there is a slight defect.
Such a color filter with incomplete color placement replenishes the colored ink corresponding to the defective portion, but this work is extremely complicated.

An object of the present invention is to provide a method for producing a color filter which can be put into practical use by simply repairing a relatively slight color ink color film defect.

[0005]

According to the present invention, there is provided a step of adhering a colored color ink coating on one surface of a light-transmissive substrate, a step of subsequently inspecting the colored color ink coating for defects. When there is a defect in the ink film, a step of coating a photo-curable non-transparent resin on the ink film surface in a predetermined area including the defect part, and then irradiating light from the substrate side to cure the non-transparent resin in the defective part And a step of removing the non-transparent resin other than the defective portion after that.

[0006]

According to the method of manufacturing a color filter of the present invention, the non-transparent resin replenished in the defective portion of the colored color ink film is observed as gray even if it is observed as a white bright spot by the backlight. Nothing more than Therefore, a slight loss of the ink film can be practically ignored. The non-transparent resin can be replenished by adhering to the vicinity or the entire surface of the defective portion and photocuring and removing it.
Simple repair is enough.

[0007]

Embodiments will be described below with reference to the drawings.
The same parts are denoted by the same reference numerals. As shown in FIG. 1A, a light blocking layer 12 made of chromium was attached in a matrix on one surface of a transparent glass substrate 11. Next, after cleaning the substrate surface, using an intaglio offset printing machine, using a colored ink mainly composed of an epoxy resin-based varnish containing a pigment and a solvent, an intaglio plate was used to form dots or stripes in accordance with an indented cell pattern. A colored color ink coating 13 was printed on the substrate surface. Colored color ink film 13
The three primary colors of red (R), green (G) and blue (B) were sequentially printed. Since each of the colored ink coatings R, G, and B is viscous, the portion in the vicinity of the center, which is slightly deviated to the rear end side in the printing direction, has a mountain-shaped bulge. The film thickness near the top is
It is 4 to 5 μm. After forming the colored ink film 13, the solvent was removed by drying at a temperature of about 100 ° C. at which thermal curing of the ink film did not occur.

Next, the presence or absence of defects in the colored color ink film was inspected. There was a defect portion 14 without an ink film in a part. Therefore, as shown in (b) of the figure, a photocurable non-transparent resin, that is, a negative resist 15 is applied to the region having the defective portion or the entire surface. Then, ultraviolet rays were irradiated from the light source 16 for a predetermined time from the back surface side of the glass substrate 11 to cure the negative resist 15 filled in the defective portion 14. Next, the uncured negative resist in the region other than the defective portion was removed with a solution containing about 10% of inorganic alkali. As a result, as shown in (c) of the figure, a color filter in which the negative resist 15 is filled in the defective portion without the color ink film is obtained. Then, the coated surface was smoothed and heat treated to cure. In the color filter manufactured in this way, the negative resist 15 replenished in the defective portion of the colored color ink film is not transparent, so that it becomes gray when observed with a backlight, and the defect can be almost ignored. Therefore, if the degree of loss of the colored color ink coating is relatively small, it can be used practically without any problem.

The negative resist to be replenished in the defective portion of the colored color ink film may contain a blue pigment. A negative resist containing a blue pigment has a low light transmittance and a low luminosity factor, and thus can be similarly used practically. Moreover, if the negative resist containing the blue pigment is replenished in the defective portion of the blue ink film, the defect is eliminated, which is more convenient.

[0010]

As described above, according to the present invention,
The defect of the colored color ink film can be repaired by a relatively simple repair, and the mass productivity is high.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of an essential part showing an embodiment of the present invention.

[Explanation of symbols]

11 ... Translucent substrate, 13 ... Colored color ink coating, 14 ... Missing part, 15 ... Non-transparent resin resin.

Claims (1)

[Claims] 1. A step of adhering a colored color ink coating to one surface of a light-transmissive substrate directly or via another layer, a step of subsequently inspecting the colored color ink coating for defects. When there is a defect in the color ink film, a step of coating a photo-curable non-transparent resin on the ink film surface of a predetermined area including the defect part, and then irradiating light from the substrate side to make the defect part non-transparent A method for manufacturing a color filter, which comprises a step of curing a resin and a step of thereafter removing a non-transparent resin other than a defective portion.