ADAPTIVE FEEDBACK CONTROL METHOD OF FSC DISPLAY
First Claim
1. An adaptive feedback control method of a field sequential color (FSC) display, comprising:
- a reset step, wherein gray-scale values of a three primary color field of an input image are converted into gray-scale values of a new three primary color field and a dominated color field (D-field);
a sampling step, wherein a pixel sampling is performed on a resolution of the input image in a sampling interval;
a feedback control step, wherein a pixel by pixel sum operation is performed for each separated color on a color break-up (CBU) color value and a color value of the input image in a Lu′
v′
color space to obtain a color difference sum, and a feedback control is performed at a bit precision on the color difference sum, thereby obtaining a minimum color difference sum; and
a liquid crystal/backlight synchronization step, wherein a liquid crystal signal (LC signal) and a backlight gray-scale value of the input image are synchronized according to the minimum color difference sum.
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Abstract
An adaptive feedback control method of a field sequential color display includes converting gray-scale values of a three primary color field of an input image into gray-scale values of a new three primary color field and a dominated color field (D-field); performing sampling; performing a pixel by pixel sum operation for each separated color through color gamut conversion to obtain a color difference sum; performing a feedback control at a bit precision to obtain a minimum color difference sum; and then performing a liquid crystal/backlight synchronization step of synchronizing a liquid crystal signal and a backlight gray-scale value of the input image; or dividing the input image into a plurality of blocks; performing feedback control operations; obtaining a minimum sum in each block to serve as an optical backlight value, thereby reducing a CBU phenomenon, and minimizing or controlling the generated CBUs to reduce the operation loads.
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Citations
13 Claims
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1. An adaptive feedback control method of a field sequential color (FSC) display, comprising:
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a reset step, wherein gray-scale values of a three primary color field of an input image are converted into gray-scale values of a new three primary color field and a dominated color field (D-field); a sampling step, wherein a pixel sampling is performed on a resolution of the input image in a sampling interval; a feedback control step, wherein a pixel by pixel sum operation is performed for each separated color on a color break-up (CBU) color value and a color value of the input image in a Lu′
v′
color space to obtain a color difference sum, and a feedback control is performed at a bit precision on the color difference sum, thereby obtaining a minimum color difference sum; anda liquid crystal/backlight synchronization step, wherein a liquid crystal signal (LC signal) and a backlight gray-scale value of the input image are synchronized according to the minimum color difference sum. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An adaptive feedback control method of a field sequential color (FSC) display, comprising a color difference sum acquisition step and a signal synchronization step, wherein:
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the color difference sum acquisition step comprises; converting an image of a nth frame into a Lu′
v′
color space;sampling on 8 groups of 1-bit backlights and sub-images in a 2×
4 sampling interval to include a CBU image, and performing 8 groups of color break-up (CBU) color difference sum operations synchronously through comparing with an input image;filtering the color difference sums and determining a bit number of a next frame; and considering to be the minimum color difference sum of new 7 sets of 2-bit groups from each two adjacent 1-bit groups of color backlight having minimum a color difference sum respectively; and the signal synchronization step comprises; processing a liquid crystal signal (LC signal) of the input image by a frame buffer, so as to obtain a LC signal of a (n-1)th frame; processing a minimum CBU color difference sum of a color backlight by a backlight buffer (BL buffer), so as to obtain a backlight gray-scale value of the (n-1)th frame; and using a lookup table (LUT) to generate a new LC gray-scale value through using the synchronized LC signal and backlight gray-scale value of the (n-1)th frame. - View Dependent Claims (8, 9, 10)
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11. An adaptive feedback control method of a field sequential color (FSC) display, applicable to an original image of an input image divided into a plurality of blocks, comprising:
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a sampling step, wherein the original image is sampled to obtain a sampling image with a resolution smaller than that of the original image; a reset step, wherein liquid crystal signals of three primary color fields of the input image are converted into backlight signals corresponding to liquid crystal signals of new three primary color fields and a dominated color field (D-field), a feedback operation step, further comprising; a time delay step, wherein the liquid crystal signals of the new three primary color fields are delayed for different time intervals, a subtract step, wherein the liquid crystal signals corresponding to the color fields are subtracted from each other, and absolute values of subtracting results are obtained, and a sum-up step, wherein a sum-up operation is performed on each color field in the subtract step, so as to obtain sums of each block, wherein the sampling step, the reset step, and the feedback operation step are performed from an initial block to a final block among the blocks, and a minimum sum is obtained from the sums calculated for each block to serve as a backlight signal of each block and is provided for operations of a next block. - View Dependent Claims (12, 13)
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Specification