Image display device, and image display method

An image display device and a technology for display, applied to static indicators, instruments, etc., can solve the problem of reduced color reproducibility and achieve high color rendition
CN102124512AInactive Publication Date: 2011-07-13SHARP KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHARP KK
Publication Date
2011-07-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides an image display device and an image display method. In the present invention, display is performed with high color reproducibility by a display device that performs area active drive. A LED output value calculation section (151) calculates, from an input image (31), LED data (33) representing the brightness of the LED corresponding to each area when the LED emits a beam. A display brightness calculation section (152) calculates, from the LED data (33) and a brightness diffusion filter (155), a brightness image (41) including the displaying brightness of each area. A LED data calculation section (154) calculates, from the input image (42) delayed by a frame memory (153) and the brightness image (41), the tentative light transmission of a displaying element of a liquid crystal panel. When the maximum value of each color thereof is greater than one, a value obtained by dividing the tentative light transmission by the maximum value is set as the light transmission; when the maximum value is not greater than one, the tentative light transmission is set as the light transmission. Then, the liquid crystal data (32) representing the light transmission is calculated. Therefore, even if there is a color the brightness of which is not sufficient, the ratio between the colors does not change, leading to an increase in color reproducibility.
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Description

technical field

[0001] The present invention relates to an image display device and an image display method, and more particularly to an image display device having a function of controlling the brightness of a backlight (backlight dimming function) and an image display method in the device. Background technique

[0002] In an image display device having a backlight such as a liquid crystal display device, by controlling the brightness of the backlight according to an input image, power consumption of the backlight can be suppressed and the image quality of a displayed image can be improved. In particular, by dividing the screen into a plurality of areas and controlling the brightness of the backlight corresponding to the area based on the input image in the area, it is possible to further reduce power consumption and improve image quality. Hereinafter, the method of driving the display panel while controlling the luminance of the backlight based on the input image in the ar...

Claims

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