Color imaging devices and color filter arrays using photo-bleach

Details Color imaging devices and color filter arrays using photo-bleach Color imaging devices and color filter arrays using photo-bleach

1978-01-30

1981-01-27

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Image pickup tube

358 43, H01J 2945, H01J 3138

Patent

active

042477999

ABSTRACT:
Color filter arrays for color imaging devices are disclosed. The arrays are formed in a single layer of a transparent binder containing at least one cationic photo-bleachable dye. The layer has a thickness less than 10 microns, and the dye is present in the layer in an amount sufficient to impart a density to the layer of at least about 0.5 in that portion of the spectrum in which it selectively absorbs. A method of making the arrays is also disclosed which includes the steps of (1) forming a layer of a transparent binder containing the photo-bleachable dye or dyes and a sensitizer; (2) exposing the layer to a pattern which represents a set of filter elements so as to photo-bleach the photo-bleachable dye; and (3) fixing the layer by leaching the sensitizer from the layer. In particularly preferred embodiments, the dyes are chosen so that those which absorb at longer wavelengths have a lower bleaching efficiency than those which absorb at shorter wavelengths.

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