Patent ID: 8427399

Claim:
An organic light emitting display device, comprising: a display unit including scan lines to transfer scan signals, data lines to transfer data signals, and pixels to represent image data organized in frames, the pixels being coupled to the scan lines and the data lines; a light sensor to generate light sensing signals corresponding to an external light intensity of an environment of the display device; an image judging unit to generate image judging signals, according to whether subsequent frames of the image data relate to moving images or still images, the image judging unit being configured to generate the image judging signals only if the image data corresponds to the still images; a signal processor to compare the light sensing signals with reference values to generate selection signals, and to modify the image data according to the selection signals; a frame memory to store the modified image data output from the signal processor, the frame memory being configured to store the modified image data in units corresponding to one of the frames, not change corresponding modified image data of the subsequent frames of the image data when the subsequent frames relate to the still images, and reload the frame memory from the signal processor output after a reset of the frame memory; a reset signal driver to generate reset signals to reset the frame memory, according to the image judging signals and the selection signals; a scan driver to generate the scan signals, and to sequentially output the scan signals to the scan lines; and a data driver to generate the data signals, and to output the data signals to the data lines.