Patent ID: 7573449

Claim:
A method of correcting unevenness of brightness of pixels by adding correction data corresponding to a pixel to image data specifying the brightness of the pixel, wherein a reference cycle includes a plurality of vertical scan periods and during the respective vertical scan periods of the reference cycle, one of two different data values is selected and the selected data value is output as correction data, wherein one of two different data values is supplied during at least two consecutive vertical scan periods and the other of the two different data values is supplied during at least two other consecutive vertical scan periods, a polarity of the image data centering about a predetermined potential is different in each of the at least two consecutive vertical scan periods; wherein the number of times when one of the two data values is supplied during the reference cycle is increased as a correction amount comes close to the one data value, wherein a plurality of reference coordinates is determined in advance in a pixel area and data indicating the correction amount are stored for each reference coordinate, and wherein data indicating a correction amount of a pixel are obtained by interpolating the correction amount of the respective reference coordinates in accordance with distances between the reference coordinates and the pixel.