Method and apparatus for adjusting backlight brightness
First Claim
1. A method for adjusting backlight brightness in an image display device having a number of backlights arranged as an M×
- N, 2-dimensional array, the method comprising;
a full search step determining the brightness adjustment value for each of the M×
N image blocks corresponding to the number of backlights arranged as a M×
N, 2-dimensional array, for the entire input image and selecting a reference block;
a partial search step determining the brightness adjustment value for the selected reference block and surrounding blocks thereof for the image frame inputted following the full search step and reselecting a reference block based on the brightness adjustment value of the previous reference block and surrounding blocks thereof;
an adjustment step adjusting brightness of the backlights in accordance with the brightness adjustment value for each block as determined by the full search step and adjusting brightness of the backlights in accordance with the brightness adjustment value for each reference block and surrounding blocks thereof as determined by the partial search step;
wherein the full search step is performed for only the first input frame and the frame inputted during each preset period;
wherein the partial search step is performed for all other inputted frames;
wherein the number of blocks adjusted for brightness determined in the partial search step is less than the number of blocks adjusted for brightness as determined in the full search step.
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Accused Products
Abstract
A method for adjusting backlight brightness for an image display device whose backlights are arranged in an M×N, 2-dimensional array, and an apparatus for realizing this are provided. The method comprises a full search step determining the brightness adjustment value for each of the M×N image blocks corresponding to the backlights for the entire input image and selecting a reference block; a partial search step determining the brightness adjustment value for the selected reference block and surrounding blocks thereof for the image frame inputted following the full search step and reselecting a reference block based on the brightness adjustment value of the previous reference block and surrounding blocks thereof; and an adjustment step adjusting brightness of the backlights in accordance with the brightness adjustment value for each block as determined by the full search step and/or partial search step. In accordance with the present invention, it is possible to increase the speed of image analysis for a display that uses backlights. Likewise, controlling the backlight using the characteristics of the analyzed image enables reducing power consumption and increasing the contrast ratio by applying backlight brightness according to the characteristics of the image.
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Citations
19 Claims
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1. A method for adjusting backlight brightness in an image display device having a number of backlights arranged as an M×
- N, 2-dimensional array, the method comprising;
a full search step determining the brightness adjustment value for each of the M×
N image blocks corresponding to the number of backlights arranged as a M×
N, 2-dimensional array, for the entire input image and selecting a reference block;a partial search step determining the brightness adjustment value for the selected reference block and surrounding blocks thereof for the image frame inputted following the full search step and reselecting a reference block based on the brightness adjustment value of the previous reference block and surrounding blocks thereof; an adjustment step adjusting brightness of the backlights in accordance with the brightness adjustment value for each block as determined by the full search step and adjusting brightness of the backlights in accordance with the brightness adjustment value for each reference block and surrounding blocks thereof as determined by the partial search step; wherein the full search step is performed for only the first input frame and the frame inputted during each preset period; wherein the partial search step is performed for all other inputted frames; wherein the number of blocks adjusted for brightness determined in the partial search step is less than the number of blocks adjusted for brightness as determined in the full search step. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- N, 2-dimensional array, the method comprising;
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8. An apparatus for adjusting backlight brightness in an image display device having a number of backlights arranged as an M×
- N, 2-dimensional array on the rear side of the panel, the apparatus comprising;
a brightness analysis means determining the brightness for the inputted image frame; an image partitioning means partitioning the image into M×
N image blocks to correspond to the M×
N backlights;an analysis control means controlling the brightness analysis means such that brightness is analyzed in full for the first frame and frames inputted after a preset period and only in part for the other inputted frames; and a brightness control means controlling the brightness of the M×
N backlights based on the results of analysis of the brightness analysis means, such that the number of M×
N backlights controlled based on the results of analysis of the brightness analysis means in full for the first frame and frames inputted after a preset period is greater than the number of M×
N backlights controlled based on the results of analysis of the brightness analysis means in part for the other inputted frames. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
- N, 2-dimensional array on the rear side of the panel, the apparatus comprising;
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17. A method for adjusting backlight brightness in an image display device having a number of backlights arranged as an M×
- N, 2-dimensional array, the method comprising;
inputting a first image frame; determining a brightness adjustment value for each individual M×
N image block of the first frame, wherein each individual M×
N image block correspond to individual backlights arranged as an M×
N, 2-dimensional array;adjusting a brightness of each individual backlight according to the corresponding brightness adjustment values; selecting a reference block from the among the number of M×
N image blocks of the first image frame;inputting a second image frame; selecting a number of image blocks in the second frame that surround a location of the reference block, such that reference block and the number of surrounding blocks selected is less than the total number of M×
N image blocks;determining a brightness adjustment value for the selected reference block and the surrounding blocks; adjusting a brightness of each individual backlight according to the brightness adjustment value for the selected reference block and the surrounding blocks; and reselecting a reference block from the second frame; wherein the determining of a brightness adjustment value for the each individual M×
N image block is done for only the first image frame and for the image frame inputted during each preset period. - View Dependent Claims (18, 19)
- N, 2-dimensional array, the method comprising;
Specification