Patent ID: 8294649

Claim:
A driving device for a display device, comprising: a signal controller that converts an input image signal input at a first frequency and corresponding to each pixel into first and second output image signals and alternately outputs the first and second output image signals at a second frequency higher than the first frequency; and a data driver that alternately applies the first and second output image signals to the pixels in respective fields of each frame, wherein the signal controller compares the input image signal of a present frame with the input image signal of a previous frame to convert the input image signal of the present frame into a first preliminarily-compensated signal, converts the input image signal of the present frame into a second preliminarily-compensated signal comprising upper and lower signals or converts the first preliminarily-compensated signal into a third preliminarily-compensated signal including the upper and lower signals, and generates the first and second output signals based on the first and second preliminarily-compensated signals or the first and the third preliminarily-compensated signals and an edge detection value for an image calculated based on a difference between the input image signals for the pixels, wherein, when the pixel exists in an edge region of the image, the first and second output image signals are different from each other, and when the pixel does not exist in the edge region of the image, the first and second output image signals are equal to each other, wherein the first and second output image signals A N and B N converted from the input image signal I N of the present frame satisfy A N =I N +α N (H N −I N ) and B N =I N +α N (L N −I N′ ), wherein I N′ denotes the first preliminarily-compensated signal, α N denotes an edge variable, and H N and L N denote the upper and lower signals of the second or third preliminarily-compensated signal, respectively, and an average of a gamma curve of the upper signal and a gamma curve of the lower signal is equal to a gamma curve of the first preliminarily-compensated signal.