Method for improving the white field uniformity of a projection

Details Method for improving the white field uniformity of a projection Method for improving the white field uniformity of a projection

1988-12-23

1990-04-03

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 64, 313478, H04N 916, H04N 931

Patent

active

049145100

ABSTRACT:
The white field uniformity of a projection color TV employing three monochrome cathode ray tubes is improved by matching the center-to-edge luminance gradient of the red-emitting and/or blue-emitting tube to that of the green-emitting tube having an interference filter. In a preferred embodiment, such matching is achieved by applying an optical filter of varying density on the outside surface of the display window of the tube.

REFERENCES:
patent: 4245242 (1981-01-01), Tzcka
patent: 4663562 (1987-05-01), Miller et al.
patent: 4679069 (1987-07-01), Andrea et al.

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