DISPLAY DEVICE
First Claim
1. A display device comprising:
- a backlight including a plurality of regions whose brightness can be individually controlled;
a pixel portion including a plurality of pixels provided in the plurality of regions in the backlight;
a control unit for comparing pieces of image data in a plurality of frame periods with each other in each of the plurality of regions in the backlight and for determining light-emission luminance of each of the plurality of regions in the backlight in accordance with the pieces of image data having a highest display luminance; and
a backlight controller for making the plurality of regions included in the backlight emit light in accordance with a signal from the control unit.
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Accused Products
Abstract
It is an object to improve image quality in displaying a still image and a moving image by suppressing flickers, a display malfunction, or the like of a display device. A method for controlling the light emission state of a backlight is made different between a still image portion and a moving image portion included in an image to be displayed. In specific, the amount of light emission in the still image portion is made as small as possible in a corresponding divided region of the backlight, and the amount of light emission in the moving image portion is controlled so as not to be changed as much as possible in a corresponding divided region of the backlight.
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Citations
12 Claims
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1. A display device comprising:
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a backlight including a plurality of regions whose brightness can be individually controlled; a pixel portion including a plurality of pixels provided in the plurality of regions in the backlight; a control unit for comparing pieces of image data in a plurality of frame periods with each other in each of the plurality of regions in the backlight and for determining light-emission luminance of each of the plurality of regions in the backlight in accordance with the pieces of image data having a highest display luminance; and a backlight controller for making the plurality of regions included in the backlight emit light in accordance with a signal from the control unit. - View Dependent Claims (2, 3)
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4. A display device comprising:
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a backlight including a plurality of regions whose brightness can be individually controlled; a pixel portion including a plurality of pixels provided in the plurality of regions in the backlight; a control unit for comparing pieces of image data in a plurality of frame periods with each other in each of the plurality of regions in the backlight and for determining light-emission luminance of each of the plurality of regions in the backlight in accordance with the pieces of image data having a highest display luminance; and a backlight controller for making the plurality of regions included in the backlight emit light in accordance with a signal from the control unit, wherein each of the plurality of regions in the backlight maintains certain brightness in the plurality of frame periods. - View Dependent Claims (5, 6)
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7. A display device comprising:
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a backlight including a plurality of regions whose brightness can be individually controlled; a pixel portion including a plurality of pixels provided in the plurality of regions in the backlight; a control unit for comparing pieces of image data in a plurality of frame periods with each other in each of the plurality of regions in the backlight and for determining light-emission luminance of each of the plurality of regions in the backlight in accordance with the pieces of image data having a highest display luminance; and a backlight controller for making the plurality of regions included in the backlight emit light in accordance with a signal from the control unit, wherein consecutive frames are used in the plurality of frame periods. - View Dependent Claims (8, 9)
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10. A display device comprising:
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a backlight including a plurality of regions whose brightness can be individually controlled; a pixel portion including a plurality of pixels provided in the plurality of regions in the backlight; a control unit for comparing pieces of image data in a plurality of frame periods with each other in each of the plurality of regions in the backlight and for determining light-emission luminance of each of the plurality of regions in the backlight in accordance with the pieces of image data having a highest display luminance; and a backlight controller for making the plurality of regions included in the backlight emit light in accordance with a signal from the control unit, wherein each of the plurality of regions in the backlight maintains certain brightness in the plurality of frame periods, and wherein consecutive frames are used in the plurality of frame periods. - View Dependent Claims (11, 12)
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Specification