Frame buffering data compression and decompression method and circuit for LCD overdrive

Abstract

The invention provides a frame buffering data compression method flow chart for LCD overdrive, including the following steps: executing 2X2 partitioning for the video image, calculating the gradient of the R, G and B color components of the present block in the partitioned video image in the horizontal direction and in the perpendicular direction, obtaining the maximum value of the gradient in horizontal direction and in the perpendicular direction; judging that the gradient of the present block is in the greyscale slow change according to the maximum value of the gradient in horizontal direction and in the perpendicular direction, and executing the gradient increment encoding for the present block according to the gradient. The invention solves the problem in the prior art that the larger block is needed for obtaining over three times of compression ratio, however the larger block size causes the decrease of the compressibility, further the glitter, the step and the like can appear when the bigger anamorphic former frame decompression data is used to execute OverDrive, the movement at the speed being not equal to one half of the block size exists.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a frame buffer data compression and decompression method and circuit for LCD overdrive. Background technique [0002] Due to the sampling and holding principle of LCD (Liquid Crystal Display, liquid crystal display) and the slow response characteristics of liquid crystal molecules themselves compared with CRT (Cathode Ray Tube, cathode ray tube), motion blur will appear when LCD displays moving video images. [0003] In order to reduce motion blur, LCD response time compensation (Response Time Compensation, RTC) is commonly used as a motion blur removal method. Among them, the Over Drive technology is a relatively simple and very effective technology, and its principle is to perform over-drive look-up table according to the image data of two adjacent frames. Therefore, OverDrive needs off-chip RAM to store at least one frame of image compression data. In order to reduce the capac...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a frame buffer data compression and decompression method and circuit for LCD overdrive, which can solve the problem that larger blocks are required in order to obtain a higher compression ratio of more than 3 times in the prior art. A large block size will cause a decrease in compression performance. When the decompressed data of the previous frame with large distortion is used for OverDrive, when there is movement in the video at a speed not equal to half the block size / frame, flickering and steps will appear etc.

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