Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2005-12-20
2005-12-20
Edouard, Patrick N. (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S070000
Reexamination Certificate
active
06977642
ABSTRACT:
A back light is provided with light sources, lighting control circuits for lighting the light sources, respectively, and a brightness control circuit for outputting light volume adjusting signals to the lighting control circuits, respectively. The brightness control circuit receives a luminance adjusting signal, adjusts only a part of the light volume adjusting signals, and fixes output of the rest of the light volume adjusting signals. The lighting control circuits apply voltages corresponding to the light volume adjusting signals to the light sources, thereby adjusting the light sources in luminance. The light volume adjusting signals can be adjusted one by one, which facilitates luminance adjustment. Thus, by lighting only one light source at the minimum luminance, the screen brightness of the liquid crystal display having this back light can be lowered to an appropriate level when it is used in dark places.
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Edouard Patrick N.
Fatahi-yar M.
Greer Burns & Crain Ltd.
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