Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2008-05-12
2011-11-08
Nguyen, Chanh (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S089000
Reexamination Certificate
active
08054285
ABSTRACT:
The present invention discloses a liquid crystal display apparatus and a liquid crystal television which are provided with a backlight to be lighted up by a separately-excited inverter circuit and realize improvement of contrast in low brightness. A microcomputer50obtains a brightness average value of image data from a brightness average value detecting circuit22, directs an inverter circuit62to oscillate at a duty factor corresponding to the obtained brightness average value, and directs an output processing circuit33to perform gamma correction processing with gamma correction data corresponding to the obtained brightness average value. When the brightness average value is lowered, the microcomputer50lowers the duty factor to be outputted therefrom and lowers the brightness of the backlight61. Moreover, when the brightness average value is lowered, the microcomputer50directs the output processing circuit to perform gamma correction processing with gamma correction data for widening a brightness range.
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The extended European search report, pursuant to Rule 62 EPC dated Sep. 3, 2008, searched on Aug. 28, 2008.
Funai Electric Co. Ltd.
Kirkpatrick John
Nguyen Chanh
Yokoi Toshiyuki
Yokoi & Co. U.S.A., Inc.
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