Apparatus and method for luminance control of liquid crystal...

Details Apparatus and method for luminance control of liquid crystal... Apparatus and method for luminance control of liquid crystal...

2005-06-10

2009-10-27

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C349S061000, C349S062000, C349S063000, C349S064000, C349S065000, C349S066000, C349S067000, C349S068000, C349S069000, C349S070000, C349S071000

Reexamination Certificate

active

07609248

ABSTRACT:
A luminance control apparatus of a liquid crystal display device (LCD) is presented. The LCD includes a liquid crystal display panel divided into areas, lamps, an arithmetic unit, and a lamp driver. Fewer lamps are present than the number of areas. The arithmetic unit scans pixels of each area, extracts a peak value of the gray level of pixels of the area, and calculates a maximum peak brightness value and an average value of the area. The lamp driver controls the brightness of the lamps in accordance with the average value and the maximum peak brightness value.

REFERENCES:
patent: 2002/0003522 (2002-01-01), Baba et al.
patent: 2002/0057238 (2002-05-01), Nitta et al.
patent: 2004/0125062 (2004-07-01), Yamamoto et al.
patent: 10-162988 (1998-06-01), None
patent: 2002-099250 (2002-04-01), None
patent: 1020020057407 (2002-11-01), None
Office Action issued in corresponding Japanese Patent Application No. 2005-187723; issued Feb. 16, 2009.

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