Color filter
US5176971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Aug 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133516
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A technique related to color filters to be arranged on the light-receiving surface of a color liquid crystal display device, color video camera, and the like. The color filter consists of a substrate (10) and a colored filter layer (12) formed thereon. The colored filter layer (12) comprises, for example, three groups of filter picture elements (14R), 14G, 14B) having spectral characteristics respectively corresponding to red, green and blue. Each group of filter picture elements are made of polyimide resin and dye contained therein. Further, each group of the filter picture elements (R, G, B) are arranged in direct contact with one surface of the substrate (10) without using any intermediate protecting film. The first group of filter picture elements patterned on one surface of the substrate (10) are subjected to heat treatment at a high temperature of about 250.degree. C., for example, to increase their resistance against the solvent. Then, a second coating layer for patterning the second group of filter picture elements is directly formed without using any intermediate protecting film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.