Patent ID: 8497827

Claim:
A method of driving an organic light emitting display device, comprising: generating a luminance map for a plurality of pixels by applying a driving voltage having a common magnitude to driving transistors associated with the plurality of pixels of a display panel and capturing a luminance associated with each of the pixels; generating a threshold voltage map by calculating threshold voltage correction values that compensate for threshold voltage variation of the driving transistors corresponding to luminances of the pixels; generating a lookup table by sampling the threshold voltage correction values stored in the threshold voltage map to generate sampled threshold voltage correction values stored in the lookup table, wherein the plurality of pixels is divided into a plurality of grid units, and each of the sampled threshold voltage correction values is sampled from a plurality of threshold voltage correction values corresponding to multiple pixels in a grid unit of the plurality of grid units; restoring the threshold voltage correction values by interpolating the sampled threshold voltage correction values; and correcting a driving voltage by adding the restored threshold voltage correction values to input gray level data to generate added values and by providing the added values to the display panel, wherein the generating the threshold voltage map comprises: calculating the threshold voltages corresponding to the luminances of the pixels by using correlation between the luminances of the pixels and the threshold voltages of the driving transistors formed in the pixels; implementing gamma correction such that the input gray level data has a substantially linear relation with gray level voltages applied to the driving transistors; and scaling the gray level voltages corresponding to the gray level data to generate gamma-corrected threshold voltages as the threshold voltage correction values and to generate the threshold voltage correction values as the threshold voltage map.