IMAGE PROCESSING DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. An image processing device for processing an image signal to be displayed in a liquid crystal display device that includes a backlight and a liquid crystal panel, the image processing device comprising:
- a luminance setting unit that sets a prescribed first luminance as a luminance of the backlight in a first control mode, and sets a second luminance less than the first luminance as the luminance of the backlight in a second control mode, the second luminance being determined according to gradation levels of respective pixels in a frame for each frame of the image signal, the second luminance being set lower when the gradation levels of pixels in a frame are generally darker so as to reduce power consumption at the backlight; and
a correction unit that, in the second control mode, corrects pixel values in the image signal for each frame to compensate for a reduced luminance of the second luminance relative to the first luminance,wherein the pixel values in the image signal include respective gradation levels for a plurality of primary colors, andwherein the correction unit corrects the respective gradation levels for the plurality of primary colors of the pixels in accordance with display characteristics of the liquid crystal panel and the second luminance set by the luminance setting unit such that amounts of correction for the gradation levels differ between at least two of the primary colors.
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Abstract
The phenomenon of the hue of an image displayed in a liquid crystal display changing depending on whether or not CABC is employed is reduced. An image processing device sets a predetermined first brightness as the backlight brightness if CABC is not to be performed, and if CABC is to be performed, sets, for each frame of an image signal displayed on the liquid crystal panel, a second luminance determined according to the gradation of the pixels in the frame. If CABC is to be performed, the image processing device corrects the gradation values of the primary colors of the pixels in each frame of the image signal according to the second luminance set for that frame and on the basis of the display characteristics of the liquid crystal panel.
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Citations
6 Claims
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1. An image processing device for processing an image signal to be displayed in a liquid crystal display device that includes a backlight and a liquid crystal panel, the image processing device comprising:
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a luminance setting unit that sets a prescribed first luminance as a luminance of the backlight in a first control mode, and sets a second luminance less than the first luminance as the luminance of the backlight in a second control mode, the second luminance being determined according to gradation levels of respective pixels in a frame for each frame of the image signal, the second luminance being set lower when the gradation levels of pixels in a frame are generally darker so as to reduce power consumption at the backlight; and a correction unit that, in the second control mode, corrects pixel values in the image signal for each frame to compensate for a reduced luminance of the second luminance relative to the first luminance, wherein the pixel values in the image signal include respective gradation levels for a plurality of primary colors, and wherein the correction unit corrects the respective gradation levels for the plurality of primary colors of the pixels in accordance with display characteristics of the liquid crystal panel and the second luminance set by the luminance setting unit such that amounts of correction for the gradation levels differ between at least two of the primary colors. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification