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Title:
LIGHT VOLUME CONTROL METHOD FOR BACK LIGHT, AND LCD DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2011/121880
Kind Code:
A1
Abstract:
Disclosed are a light volume control method for a back light, and an LCD device using the same. The LCD device is provided with: a liquid crystal panel (42); a temperature measurement apparatus (45) which measures the temperature of the liquid crystal panel; a back light (43) which radiates light onto the liquid crystal panel; a light volume measurement apparatus (44) which measures the volume of light radiated from the back light; a brightness setting apparatus (54) which sets a brightness setting value (Br) corresponding to the light volume of the back light; a first lighting volume control unit (71) which sets a fixed target light volume (Brt1) for the back light on the basis of the brightness setting value; a second lighting volume control unit (81) which sets a first variable target light volume (Brt2(n)) for the back light on the basis of the light volume predicted by the measurement from the light volume measurement apparatus; and a third lighting volume control unit (91) which sets a second variable target light volume (Brt3) for the back light on the basis of the temperature measured by the temperature measurement apparatus. The disclosed light volume control method for a back light can rapidly stabilise the brightness of an LCD device when the LCD device is started up.

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Inventors:
YOSHIDA YUYA (JP)
Application Number:
PCT/JP2011/000952
Publication Date:
October 06, 2011
Filing Date:
February 21, 2011
Export Citation:
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Assignee:
EIZO NANAO CORP (JP)
YOSHIDA YUYA (JP)
International Classes:
G02F1/133; H05B37/02
Foreign References:
JP2006276725A2006-10-12
JP2002311413A2002-10-23
JPH05289058A1993-11-05
JPH0921993A1997-01-21
Attorney, Agent or Firm:
SUGITANI, Tsutomu (JP)
Tsutomu Sugitani (JP)
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