Liquid crystal display device

A liquid crystal display device, liquid crystal panel technology, applied in static indicators, cathode ray tube indicators, televisions, etc., can solve the problems of light source luminous brightness power reduction, power reduction, etc., to reduce power consumption, reduce power consumption, suppress The effect of power consumption

Inactive Publication Date: 2008-11-12
SHARP KK
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the video feature value (frequency curve) is small, the effect of power reduction can be obtained due to the decrease in light emission luminance, but in the case of other video feature values ​​(frequency curve) are large , there is a problem that a sufficient power reduction effect cannot be obtained

Method used

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Embodiment Construction

[0072] According to the embodiment of the liquid crystal display device of the present invention, the feature quantity of the image signal uses the average luminance level (APL; Average Picture Level) in one frame of the image signal. Furthermore, a luminance control table for controlling the emission luminance of the backlight light source according to the change of the APL is held.

[0073] The brightness control table is prepared in advance considering the brightness around the liquid crystal display device, detects the brightness around the above device, selects the brightness control table to be used according to the detected result, and controls the backlight light source according to the brightness control characteristics of the selected brightness control table Luminous brightness.

[0074] FIG. 1 is a block diagram illustrating an embodiment of a liquid crystal display device of the present invention. In liquid crystal display device 1 , tuner 12 selects a channel fr...

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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.

Description

technical field [0001] More specifically, the liquid crystal display device according to the present invention relates to a liquid crystal display device capable of performing appropriate video display according to surrounding brightness and content of displayed video. Background technique [0002] In a liquid crystal display device including a liquid crystal panel that modulates light from a light source according to a video signal and a backlight unit for illuminating the liquid crystal panel, a technology is known that can control the luminance of the light source of the backlight according to the brightness around the liquid crystal display device. . Here, the liquid crystal display device includes a brightness sensor for detecting the brightness around the liquid crystal display device, and the light emission brightness of the backlight light source is controlled based on the brightness around the liquid crystal display device detected by the brightness sensor. Here, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20G09G3/34H04N5/66
CPCG09G2360/16H04N21/42202G09G2330/021G09G2320/0653G09G2320/0238G09G2320/064G09G2320/0626H04N5/58G09G3/3406G09G2360/144G09G3/36G09G3/20G09G5/10G02F1/133
Inventor 藤根俊之小桥川诚司关口裕也山口祐一郎
Owner SHARP KK
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