Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-03-16
1991-04-30
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315367, 358164, 358 32, 364521, G09G 104, H04N 5202, H04N 969, G06F 1500
Patent
active
050121634
ABSTRACT:
Methods and apparatus for providing pixel brightness correction in monitors. The methods and apparatus disclosed herein provide significant cost reductions in gamma correction circuitry by first degamma correcting pixel value data stored on a frame buffer, and then gamma correcting the degamma corrected pixel value data before the data is stored back on the frame buffer. Circuits for providing pixel brightness correction in a monitor comprise logic circuits for generating upper bits of a data word representing pixel intensity, shifter circuits interfaced with the logic circuits for generating lower bits of the data word representing pixel intensity, and combining circuits interfaced with the logic circuits and the shifter circuits for generating intermediate bits of the data word representing pixel intensity.
REFERENCES:
patent: 4786968 (1988-11-01), Kutner
patent: 4808984 (1989-02-01), Trueblood et al.
Alcorn Byron A.
Cherry Robert W.
Coleman Mark D.
Rauchfuss Brian D.
Taylor Gary L.
Hewlett-Packard Co.
Issing Gregory C.
Kelley Guy J.
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