Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
2007-02-13
2007-02-13
Shalwala, Bipin (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
C345S213000, C345S214000, C345S690000, C349S005000, C353S031000, C353S084000
Reexamination Certificate
active
10628393
ABSTRACT:
A 2.2th-power to 1st-power conversion circuit102uses a 2.2th-power curve to convert an input R signal ‘a’ into an R signal ‘b’ expressed in a 1st-power signal space. Offsets, which are to be added to a G signal and a B signal, at each tone of the R signal ‘b’ expressed in the 1st-power signal space have been stored in advance in a GLUT112for R and a BLUT113for R. In response to input of the R signal ‘b’, the GLUT112for R and the BLUT113for R output the offsets, which are to be added to the G signal and the B signal, according to the tone value of the R signal ‘b’. An adder circuit122adds offsets ‘c’ and ‘d’, which are output from an RLUT114for G and an RLUT116for B, to the R signal ‘b’ output from the 2.2th-power to 1st-power conversion circuit102, so as to give an R signal ‘e’. A 1st-power to 2.2th-power conversion circuit132reversely converts the R signal ‘e’ according to the 2.2th-power curve. The technique of the invention thus effectively prevents chromaticity coordinates of color rays emitted from a display device from being varied with a variation in tone values of the R, G, and B signals.
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Kovalick Vincent E.
Oliff & Berridg,e PLC
Shalwala Bipin
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