Absorption filter for color display devices

Details Absorption filter for color display devices Absorption filter for color display devices

H - Electricity

01

J

88/121, 313/84

H01J 29/10 (2006.01) G02B 5/20 (2006.01) G02B 5/22 (2006.01) H01J 29/18 (2006.01) H01J 29/89 (2006.01)

Patent

CA 2032166

2032166 9013906 PCTABS00002 A contrast enhancement filter (24) for color displays, particularly adapted for color CRT tubes (10) of the shadow mask type. A transparent plate (40) has applied thereon absorptive areas (42), each area dyed with a primary color corresponding to the color dots (46) of the CRT display face and a plurality of such color areas (42) randomly disposed over each color dots (46). Since the absorption areas (42) are spacially independent, each color area (42) acts independently of the others. The filter (24) 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 (58, 60, 62) are disposed over the phosphor dots (50, 52, 54) in a predetermined array, allowing the filter plate (56) to replace a conventional faceplate and filter combination structure, while providing a selective viewing angle of high contrast. The filter (24) is suitable for any light-responsive display screen, also including liquid crystal elements.

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