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Color Compensator for CRT Display

IP.com Disclosure Number: IPCOM000064295D
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Clitheroe, AM Hillan, JM Shepherd, ET [+details]

Abstract

To compensate for the apparent variation in the colors of a CRT display when viewed in different ambient light conditions, the color content of the ambient light is sensed and used to adjust the color balances of the CRT to provide visibly correct colors. It has been observed with CRT color displays that the color of the display appears to change with ambient lighting conditions. This was first seen with a display which gave an acceptable white with fluorescent lighting but appeared pink by daylight. Further investigation showed that the effect occurs with colors other than white and is most pronounced with yellow and its derivatives. It is thought that this is a physiological effect due to the brain evaluating a screen color with reference to ambient light (which is evaluated as white).