IMAGE PROCESSING DEVICE AND IMAGE DISPLAY DEVICE

WIPO Patent Application WO/2011/036692

A1

Provided are an image display device for performing a display with a high dynamic range by modulating the brightness of a light source and an image processing device. A light source brightness calculation unit (111) calculates the light source brightness of the light emitted by a backlight (122) on the basis of the pixel value of an input image. An accumulated emission amount calculation unit (1131) calculates an accumulated emission amount by adding the light source brightness values used when displaying images during an arbitrary period, the images having display times earlier than the display time of the input image. A difference calculation unit (1132) compares the accumulated emission amount with a predetermined reference emission amount. A light source brightness correction unit (1133) obtains a corrected light source brightness that is corrected so that the light source brightness becomes a smaller value when the difference value between the accumulated emission amount and the reference emission amount is smaller than a reference value. According to the invention, it is possible to suppress as much as possible the degradation and temperature rise of the light source when the light emission is continued with a high light source brightness for a long time. The invention can be applied to, for example, a transmission type liquid crystal display device in which a liquid crystal panel and a backlight are combined.

BABA MASAHIRO

PCT/JP2009/004783

March 31, 2011

September 22, 2009

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TOSHIBA KK (JP)
BABA MASAHIRO
NONAKA RYOSUKE

G02F1/133

JP2008076755A	2008-04-03
JP2008107719A	2008-05-08

SAGOI, MASAYUKI (JP)
Masayuki Sunai (JP)

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