Sharp Kabushiki Kaisha Corporation

Yuhya Sekiguchi

Seiji Kohashikawa

Yuhichiro Yamaguchi

Toshiyuki Fujine

The present invention provides a display device capable of realizing an appropriate screen display luminance in accordance with a video feature quantity and brightness around and sufficiently reducing power consumption. A liquid crystal display apparatus () includes: a liquid crystal panel () for displaying a video by an input video signal; a backlight unit () as a light source for irradiating the liquid crystal panel (); and a brightness sensor () for detecting the brightness around the liquid crystal display apparatus (). According to the brightness detected by the brightness sensor (), luminance conversion characteristic defining the light emission luminance of the backlight for the feature quantity (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 apparatus becomes darker and the position of the characteristic modification point as the point where the slope of the luminance conversion characteristic is changed is shifted in the direction of the feature quantity change. According to the obtained luminance conversion characteristic, the light emission luminance of the backlight is controlled.

Liquid crystal display apparatus

Provided is a liquid crystal display apparatus capable of stopping the brightness control of a back light source on the featuring quantity of an input video signal, in case a multi-plane display was performed. The liquid crystal display apparatus comprises a liquid crystal panel () for displaying a picture, a light source for irradiating the liquid crystal panel (), a backlight unit () for controlling the light source, a two-plane control unit (), and a brightness control unit (). In accordance with the featuring quantity of the input video signal, the brightness control unit () performs the control of the emitting brightness of the back light source, upon the backlight unit (). In case it is decided by a notice from the two-plane control unit () that the display mode for displaying a plurality of planes was selected, the brightness control unit () controls the backlight unit (), so that the emitting brightness of the back light source may be kept constant irrespective of the featuring quantity of the input video signal.

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Tsu, Japan

Yuhya Sekiguchi