Method of manufacturing color filters for liquid crystal cells

Details Method of manufacturing color filters for liquid crystal cells Method of manufacturing color filters for liquid crystal cells

1991-01-29

1992-05-12

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Diffusion transfer dyeing process, transfer sheet and product

Dry heat treatment for penetration

8469, 8470, 8638, D06P 500

Patent

active

051123614

ABSTRACT:
A method of manufacturing a color filter for a liquid crystal cell comprises forming a plurality of patterns, each of a respective dye intermediate material, on a carrier element. The patterns of dye intermediate materials are then brought into contact with a substrate layer, supported on a glass substrate, under the application of heat and pressure. The substrate layer, such as a polyacrylonitrile layer, contains free acid groups which interact with the dye intermediate materials to form the colors of the color filter in the substrate layer. The method permits the actual formation of the colors on the substrate to be effected in a single alignment step, minimizing wastage of the relatively expensive glass substrates. Furthermore, as the dyes providing the colors of the filter are chemically part of the substrate layer, they are very resistant to leaching by the liquid crystal materials.

REFERENCES:
patent: 4596190 (1986-06-01), Hanstein et al.
patent: 4740497 (1988-04-01), Harrison et al.
patent: 4842613 (1989-06-01), Purser
patent: 4923860 (1990-05-01), Simons
patent: 4965242 (1990-10-01), De Boer et al.
patent: 4968658 (1990-11-01), Beck et al.

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