Computer graphics processing and selective visual display system – Display peripheral interface input device
Patent
1995-07-20
1998-10-13
Wu, Xiao
Computer graphics processing and selective visual display system
Display peripheral interface input device
345 22, 345204, 348173, G09G 502
Patent
active
058219170
ABSTRACT:
A system and method of compensating for the effects of aging of phosphors and faceplate upon color accuracy in cathode ray tubes, wherein beam current measurements are made upon individual cathodes of a cathode ray tube to sample the individual beam currents at periodic intervals. The sum-totals of the individual beam current measurements are then stored in a non-volatile memory location. Correction factors are calculated for both luminous efficiency degradation and for deviations in hue, based on the stored sum-total beam current measurements in combination with empirically-derived formulae. These correction factors are then used to calculate corrected tristimulus values X, Y, and Z. The corrected tristimulus values are used to calculate the amount of beam current necessary to compensate for color degradation of the cathode ray tube. Finally, the respective gains of the video amplifiers are adjusted to achieve the amount of beam current necessary to compensate for the effects of aging of the cathode ray tube.
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Apple Computer Inc.
Koerner Gregory J.
Wu Xiao
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