Patent ID: 8379034
Filing Date: 2013-02-19
Classification: G09G

Abstract:
1. A circuit for compensating a display defect in a video display device comprising: a memory storing position information on a plurality of defective regions of a display panel, gray scale section information, defect level data respectively corresponding to the defective regions, a plurality of compensation data sets respectively corresponding to the defect level data, direction information on the defective regions, an order information respectively corresponding to the defective regions, and brightness/darkness information respectively corresponding to the defective regions, wherein each of the defect level data indicates defect extent of the corresponding defective region compared to a regular region and each of the compensation data sets includes a plurality of compensation data divided for gray scale sections; a first compensation unit, upon reception of data to be displayed on the defective regions, determining defect level data on the corresponding defective region of the data to be displayed, selecting the compensation data set corresponding to the determined defect level data, selecting a compensation data corresponding to the data to be displayed in the selected compensation set, and for compensating the data to be displayed using the selected compensation data; and a second compensator distributing the compensated data from the first compensation unit spatially and temporally by using dither patterns for making fine compensation, wherein the first compensation unit includes: a grayscale determiner selecting a gray scale section information corresponding to the data to be displayed in the gray scale section information from the memory, a position determiner detecting position information on the corresponding defective region for the data to be displayed in the position information from the memory and a number of detected times of the defective regions according to the direction information on the defective regions from the memory, a defect level data selection unit selecting a defect level data on the corresponding defective region in the defect level data from the memory according to the detected position information from the position determiner, a compensation data selector selecting a compensation data set corresponding to the defect level data from the defect level data selection unit in the compensation sets from the memory, and selecting a compensation data corresponding to the selected gray scale section information from the grayscale determiner in the selected compensation data set, an adder adding the selected compensation data from the compensation data selector to the data to be displayed, a subtracter subtracting the selected compensation data from the data to be displayed, a first multiplexer selecting a brightness/darkness information corresponding to the defective region in the brightness/darkness information on the defective regions stored in the memory according to the detected number of detection times of the defective regions from the position determiner and the order information on the defective regions from the memory, and a second multiplexer selecting one of the compensated data either from the adder or the subtracter according to the selected brightness/darkness information from the first multiplexer.