Absorption filters for chlor display devices

Details Absorption filters for chlor display devices Absorption filters for chlor display devices

1989-05-03

1992-06-09

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Screen

313475, 313479, 358253, 359 68, 359885, 385115, H04N 572

Patent

active

051210304

ABSTRACT:
A contrast enhancement filter for color displays, particularly adapted for color CRT tubes of the shadow mask type. A transparent plate has applied thereon absorptive areas, each area dyed with a primary color corresponding to the color dots of the CRT display face and a plurality of such color areas randomly disposed over each color dot. Since the absorption areas are spacially independent, each color area acts independently of the others. The filter provides bandpass efficiency comparable to monochrome filters, and has a broad viewing range essentially independent of angle of vision. In a further embodiment, colored oriented fiber-optic elements are disposed over the phosphor dots in a predetermined array, allowing the filter plate to replace a conventional faceplate and filter combination structure, while providing a selective viewing angle of high contrast. The filter is suitable for any light-responsive display screen, also including liquid crystal elements.

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