Method for manufacture of a color filter

• US 5,725,976 A
• Filed: 01/22/1997
• Issued: 03/10/1998
• Est. Priority Date: 01/30/1996
• Status: Expired due to Fees

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Nakano, Tsuyoshi, Sasaki, Reiko, Okada, Yoshikatsu
• Primary Examiner(s): McPherson, John A.
• Application Number:
  US08/786,291
• Time in Patent Office: 412 Days
• Field of Search: 430/7, 430/321, 349/106, 349/110
• US Class Current: 430/7
• CPC Class Codes: G02B 6/2551 using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters

Abstract

A color filter comprising a transparent substrate, more than one transparent, electrically conductive circuit provided on a surface of the transparent substrate, window-shaped, colored coating films on the more than one transparent, electrically conductive circuit, and frame-shaped light-screening coating films interlaced between the window-shaped, colored coating films, the frame-shaped light-screening coating films having a larger film thickness than the window-shaped, colored coating films, which is free from the leakage of light from around each of the colored coating films so that it provides high contrast image and its method of manufacture.

Claims

1. A method for manufacturing a color filter comprising a transparent substrate;

more than one transparent, electrically conductive circuit provided on a surface of the transparent substrate;

window-shaped, colored coating films on the more than one transparent, electrically conductive circuit; and

frame-shaped light-screening coating films interlaced between the window-shaped, colored coating films;

the frame-shaped light-screening coating films have a larger film thickness than the window-shaped, colored coating films;

which comprises the steps of;

(a) coating a transparent substrate having a surface carrying more than one transparent, electrically conductive circuit with a negative or positive photoresist composition capable of giving light-screening coating films to form a photoresist layer covering the surface,

(b) patterning the photoresist layer photo-lithographically to form frame-shaped light-screening coating films which are interlaced between window-shaped bare portions and have a predetermined film thickness and a shape defined by lengthwise frames and crosswise frames of the window-shaped bare portions, the lengthwise frames of the light-screening coating films being formed at least to fill gaps formed by the more than one transparent, electrically conductive circuit and the crosswise frames of the light-screening coating films being formed to cross on the more than one transparent, electrically conductive circuit, and then

(c) forming colored coating films to fill the window-shaped bare portions by electrodeposition so as to make the predetermined film thickness of the frame-shaped light-screening coating films more than that of the resulting window-shaped, colored coating films, wherein step (c) includes the step of carrying out the electrodeposition to form window-shaped, colored coating films which at least have lengthwise corner edges piling up high on the light-screening coating films.

2. The method according to claim 1, wherein step (b) includes the step of forming the lengthwise frames of the light-screening coating films to fill gaps formed by the more than one transparent, electrically conductive circuit and pile up on the more than one transparent, electrically conductive circuit at lengthwise corner edge.