JPH02271302A - Production of color filter - Google Patents

Abstract

PURPOSE:To improve quality and to obtain the production process for the color filter which is excellent in mass productivity and can deal with the trend toward the larger sizes of panels by etching the unnecessary parts of a plating layer formed by an electroless plating method on a glass substrate and forming light shielding layers, then forming filter parts. CONSTITUTION:The nickel plating layer 6 is formed by the electroless plating method on the glass substrate 1 and thereafter, a photoresist is applied thereon to form the resist layer 7, following which the resist layer is subjected to the patterning treatment of exposing and developing by using a photomask 8. After the nickel plating layer 6 of the parts not coated with the resist layer 7 is etched, the resist layer 7 is removed to form the prescribed light shielding layers 2. A dye substrate 10 is applied on such glass substrate 1 and only the parts to be dyed are exposed by using a mask 11 having light transmittability and is thereby photoset. The dye substrate 10 in the other parts is etched and thereafter, the dye substrate 10 is dyed to form the filter parts 3. Filter parts 4, 5 are similarly and successively formed, by which the color filter is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a color filter used in a color liquid crystal display device, and more particularly to a method of manufacturing a light shielding layer of a color filter.

1. Rice Limb Distortion The light-shielding layer of the above-mentioned color filter is generally produced by a sputtering method or a dyeing method.

In the sputtering method, gas discharge is performed in a vacuum using a coating metal (chromium) as a target as a cathode. As a result, ions collide with the chromium surface to generate chromium mist, which adheres to the glass surface, thereby forming a chromium layer on the glass surface.

On the other hand, the dyeing method described above involves applying a photoresist onto a glass substrate using a spinner method or the like, forming a pattern using a mask, and then immersing the photoresist in an aqueous solution of a black dye.

II Since it cannot be handled in large quantities and cannot be processed in large quantities, mass productivity is poor. In addition,
Since the operation is complicated and high voltage is required, installation locations are limited.

On the other hand, in the above dyeing method, in order to obtain sufficient light-shielding properties, it is necessary to make the light-shielding layer thicker than the color filter part. Therefore, a liquid crystal cell was fabricated by coating the above-mentioned color filter with an alignment film. In some cases, the gearing of the liquid crystal layer becomes non-uniform, resulting in uneven display.The present invention has been made in consideration of the above-mentioned problems, and aims to improve quality. 1. A method for manufacturing a color filter that is excellent in productivity and sufficiently compatible with larger panels.

1st ration - solution - resolution j letter! Rino Kodan] In order to achieve the second object, the present invention includes a first step of creating a plated layer on a glass substrate by electroless plating, and etching unnecessary parts of the plated layer to form a light shielding layer. The method is characterized by comprising a second step and a third step of forming a filter section on the light shielding layer forming substrate.

Saku-m-, Kawa.

With the above manufacturing method, the plating layer constituting the light shielding layer can be manufactured simply by using a bathtub for electroless waxing.

Here, since the bathtub can be easily increased in size, it can sufficiently cope with an increase in the size of a 5° liquid crystal panel, and it can be mass-produced because large plastics can be treated at one time.

In addition, the light shielding layer produced by the above manufacturing method is thin and can obtain sufficient light shielding properties, so when a liquid crystal cell is produced, 5. The gap in the liquid crystal layer does not become nonuniform, and display unevenness does not occur.

In addition, it is easy to operate as it only needs to be immersed in a bathtub, and since high voltage is not used, there are no restrictions on where it can be installed.

EXAMPLE 8 An embodiment of the present invention will be described below based on FIGS. 1(a) to (e) and FIGS. 2(a) to (d)G.

The color filter produced by the method of the present invention has a second
As shown in Figure (d), a large number of optically shielding layers 2 made of nickel are formed on a glass substrate 1. - A red filter section 3, a green filter section 4, and a blue filter section 5 are provided in this order on the glass substrate 1 between the light absorbing layers 2....

A color filter having the structure described above is manufactured as follows.

First, the surface of the glass substrate 1 is cleaned and degreased (7), and then the surface of the glass substrate 1 is treated with a chemical to swell it to condition the surface of the glass substrate 1. Thereby, the deformation of the glass substrate 1 and the component particles can be returned to normal (put into a bulk state). Next, the glass substrate 1 is immersed in sulfuric acid and chromic acid. Improving the Hydrophilicity of the Surface of the Glass Substrate 1 9 Next, the glass substrate 1 is immersed in hydrofluoric acid to perform glass etching to make the surface of the glass substrate 1 porous. This makes it possible to improve the adhesion performance of colloids and plating on the glass substrate l. After that, after completely cleaning the surface of the glass substrate 10, in order to easily deposit plating, the surface of the glass substrate 10 is sensitized (sensitized) using stannous chloride and hydrochloric acid. I do.

Thereafter, the glass substrate 1 is immersed in a solution consisting of palladium chloride and hydrochloric acid to reduce and precipitate palladium and activate it (
Acuna Beta). Next, the glass substrate 1 is thoroughly washed with water. Thereafter, electroless nickel plating is performed to form a nickel plating layer 6 on the glass substrate 1, as shown in FIG. 1(a). In the electroless nickel plating described above, an acid bath (in which E.lium hypophosphite as a reducing agent is dissolved in a nickel sulfate solution) is used. Also,
When performing electroless nickel plating, the pH and temperature (90
~95°C) must be adequately controlled.

Next, as shown in FIG. 1(t), a resist layer 7 is formed by coating photoresist on the nickel plating layer 6, and then a photomask 8 is formed as shown in FIG. Then, only the necessary portions of the resist layer 7 are exposed. Thereafter, the resist layer 7 is developed, and then the resist layer 7 is back-toned as shown in FIG. Thereafter, the portions of the nisogel mesogel layer 6 not covered with the resist layer 7 are etched, and then the resist layer 7 is removed. As a result, a predetermined light shielding layer 2 . . . is produced as shown in FIG.

Next, the glass substrate 1 on which the light shielding layer 2... is formed
A color filter is formed on top by the following steps.

First, as shown in FIG. 2(a), on the glass substrate 1,
A dyeing substrate 10 made of a natural protein such as gelatin imparted with photo-crosslinking properties is applied. Next, as shown in FIG. 2B, only the area to be dyed is exposed to light using a light-transmitting mask 11 to photocure the dyeing substrate 10, and then the dyeing substrate [10 As a result, a predetermined pattern shown in FIG. 3(c) is formed. Thereafter, the glass substrate 1 on which the predetermined pattern is formed is immersed in a red dye solution to dye the dyed substrate 10. As a result, the red filter section 3 is formed.

Thereafter, a green filter section 4 and a blue filter section 5 are sequentially formed in the same manner as the red filter section 3. In this way, a color filter is produced. In addition, in forming the above-mentioned edge filter part 4 and blue filter part 5,
In order to prevent the red filter section 3 and the green filter section 4 from being dyed, it is necessary to apply anti-staining treatment to each filter.

light! As explained above, according to the present invention, it is possible to sufficiently cope with the increase in the size of liquid crystal panels, and it is possible to process a large amount at once, making it highly suitable for mass production. Since the gaps between the layers are not uneven, display unevenness does not occur.
Product quality can be improved. Furthermore, since the operation is carried out beforehand, the operability is improved, and since the installation location is not limited, it can be placed at an appropriate position during the flow process, and it is possible to improve manufacturing efficiency.

[Brief explanation of drawings]

Figures 1 (a) to (e) are process diagrams for forming a light shielding layer on a glass substrate by electroless nickel plating;
Figures (a) to (d) are process diagrams for manufacturing color filters using a dyeing method. DESCRIPTION OF SYMBOLS 1... Glass substrate, 2... Light shielding layer, 3... Red filter part, 4... Green filter part, 5... Blue filter part, 6... Nickel plating layer. Figure 1 Patent applicant: Sanyo Electric Co., Ltd.

Claims (1)

[Claims] (1) A first step of creating a plating layer on the glass substrate by electroless plating, a second step of etching unnecessary parts of the plating layer to form a light shielding layer, and a second step of forming a light shielding layer on the light shielding layer forming substrate. A method for manufacturing a color filter, comprising: a third step of forming filter portions of various colors on the filter.