Non-uniformity correction for color crt display

Details Non-uniformity correction for color crt display Non-uniformity correction for color crt display

G - Physics

09

G

375/46, 350/79

G09G 1/28 (2006.01) H04N 9/69 (2006.01) H04N 9/73 (2006.01)

Patent

CA 1235538

UNIFORMITY CORRECTION FOR COLOR CRT DISPLAY ABSTRACT OF THE DISCLOSURE A system for the correction of nonuniformities in both color and brightness as provided for the correction of such nonuniformities in a color CRT display. The system employs correction signals which are obtained by photographing a white screen of the display at maximum brilliance. These correction signals are then added to video signals during normal operation of the display for presenting image data provided by the video signals. In the absence of any video signal, the full value of the correction signals is applied to the display. For increased amounts of video signal which cut back varying amounts of the primary colors of red, green, and blue, the correction signals are reduced in magnitude so as to provide a smaller contribution at the input video terminals of the display. Thereby, correction can be obtained over a range of varying values of intensity. -1-

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