Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Patent
1989-12-08
1991-11-19
Lawrence, Evan
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
427110, 8444, 8478, 8485, B05D 506, B05D 104, D06P 500, D06P 520
Patent
active
050665120
ABSTRACT:
Methods for the coating of different closely-spaced areas of an electrode member to produce a color filter matrix thereon. A thin translucent layer of electroconductive composition, such as indium tin oxide (ITO), is applied to isolated areas of the electrode substrate, and selected ones of said areas are charged to one polarity while the other closely-spaced areas are charged to an opposite polarity. Color material is introduced as fine droplets in a volatile vehicle, charged to said opposite polarity, for selective attraction to said selected areas and repulsion from all other areas. The procedure is repeated with different color material droplets for deposition on others of said closely-spaced areas to produce a multi-colored matrix filter, such as on the lower pel electrode or on the upper pixel common electrode of a LCD device. Preferably the ITO layer is coated with a thin polymer layer and the color material is a diffusible dye which is heat-diffused thereinto.
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Goldowsky Michael P.
Pennebaker William B.
International Business Machines - Corporation
Lawrence Evan
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