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Title:
LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/055131
Kind Code:
A1
Abstract:
Provided is a display device capable of realizing an appropriate screen display luminance in accordance with a video characteristic amount and brightness around and sufficiently reducing power consumption. A liquid crystal display device (1) includes: a liquid crystal panel (20) for displaying a video by an input video signal; a backlight unit (17) as a light source for irradiating the liquid crystal panel (20); and a brightness sensor (24) for detecting the brightness around the liquid crystal display device (1). According to the brightness detected by the brightness sensor (24), luminance conversion characteristic defining the light emission luminance of the backlight for the characteristic amount (such as APL) of the input video signal is changed. Here, the luminance conversion characteristic is changed so that the light emission luminance is reduced as the brightness around the liquid crystal display device becomes darker and the position of the characteristic modification point as the point where the inclination of the luminance conversion characteristic is changed is shifted in the direction of the characteristic amount change. According to the obtained luminance conversion characteristic, the light emission luminance of the backlight is controlled.

Inventors:
FUJINE, Toshiyuki (())
藤根 俊之 (())
KOHASHIKAWA, Seiji (())
小橋川 誠司 (())
Application Number:
JP2006/321847
Publication Date:
May 18, 2007
Filing Date:
November 01, 2006
Export Citation:
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Assignee:
SHARP KABUSHIKI KAISHA (22-22, Nagaike-cho Abeno-ku, Osaka-sh, Osaka 22, 5458522, JP)
シャープ株式会社 (〒22 大阪府大阪市阿倍野区長池町22番22号 Osaka, 5458522, JP)
FUJINE, Toshiyuki (())
藤根 俊之 (())
KOHASHIKAWA, Seiji (())
International Classes:
G09G3/36; G02F1/133; G09G3/20; G09G3/34; H04N5/66
Foreign References:
JP2004177547A2004-06-24
JPH11327454A1999-11-26
JP2001350134A2001-12-21
JP2004294767A2004-10-21
JPS6315226A1988-01-22
Other References:
See also references of EP 1950731A4
None
Attorney, Agent or Firm:
TAKANO, Akichika (NAGISA PATENT OFFICE, 9th Floor Salute Bldg., 72, Yoshida-cho, Naka-k, Yokohama-shi Kanagawa 41, 2310041, JP)
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