DRIVING METHOD FOR LOCAL DIMMING OF LIQUID CRYSTAL DISPLAY DEVICE AND APPARATUS USING THE SAME
First Claim
1. A driving method for local dimming of a Liquid Crystal Display (LCD) device, comprising:
- determining a dimming value of each of a plurality of local dimming blocks into which a backlight unit is divided to be driven on a block basis by analyzing input image data on a block basis;
detecting a high gray area concentrated with high gray levels from each local dimming block based on the analysis of the input image data, and generating position information about the high gray area according to a distance between the high gray area in the block and an adjacent block; and
compensating the dimming value of each of the plurality of local dimming blocks by spatial filtering using a spatial filter having a different filter size or different filter coefficients for local dimming blocks according to the position information about the high gray area in the local dimming block.
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Abstract
A driving method for local dimming of a Liquid Crystal Display (LCD) device and an apparatus using the same are disclosed. The driving method includes determining a dimming value of each of a plurality of local dimming blocks into which a backlight unit is divided to be driven on a block basis by analyzing input image data on a block basis, detecting a high gray area concentrated with high gray levels from each local dimming block based on the analysis of the input image data, and generating position information about the high gray area according to a distance between the high gray area in the block and an adjacent block, and compensating the dimming value of each of the plurality of local dimming blocks by spatial filtering using a spatial filter having a different filter size or different filter coefficients for local dimming blocks according to the position information about the high gray area in the local dimming block.
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Citations
12 Claims
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1. A driving method for local dimming of a Liquid Crystal Display (LCD) device, comprising:
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determining a dimming value of each of a plurality of local dimming blocks into which a backlight unit is divided to be driven on a block basis by analyzing input image data on a block basis; detecting a high gray area concentrated with high gray levels from each local dimming block based on the analysis of the input image data, and generating position information about the high gray area according to a distance between the high gray area in the block and an adjacent block; and compensating the dimming value of each of the plurality of local dimming blocks by spatial filtering using a spatial filter having a different filter size or different filter coefficients for local dimming blocks according to the position information about the high gray area in the local dimming block. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A driving apparatus for local dimming of a Liquid Crystal Display (LCD) device, comprising:
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an image analyzer that detects a maximum value for each pixel by analyzing input image data over each of a plurality of local dimming blocks into which a backlight unit is divided to be driven on a block basis, and detects a representative gray level for each block using the maximum values of pixels in the block; a dimming value decider that determines a dimming value on a block basis according to the representative gray level of each block; a high gray area detector that detects a high gray area concentrated with high gray levels from each block based on the maximum value of each pixel received from the image analyzer, and generates position information about the high gray area according to a distance between the high gray area in the block and an adjacent block; and a dimming value compensator that compensates the dimming value of each of the plurality of local dimming blocks by spatial filtering using a spatial filter having a different filter size or different filter coefficients for blocks according to the position information about the high gray area in the block. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification