Patent ID: 7952540

Claim:
An organic light emitting display device for displaying an image, the organic light emitting display device having a plurality of scan lines, a plurality of light emission control lines and a plurality of data lines, and comprising: a display area including a plurality of pixels coupled to the scan lines, the light emission control lines and the data lines; a scan driver electrically coupled to the display area through the scan lines and the light emission control lines; a data driver electrically coupled to the display area through the data lines; an optical sensor for generating an optical sensor signal corresponding to a brightness of an ambient light; a first luminance control unit for outputting a first luminance control signal for controlling a gamma-corrected gray level voltage of a data signal of the image, applied to the data lines, in accordance with the optical sensor signal; a second luminance control unit for outputting a second luminance control signal for controlling a width of a light emission control signal applied to the light emission control lines, in accordance with data of one frame of the image; and a comparator/selector for comparing the first luminance control signal with the second luminance control signal to provide the first luminance control signal or the second luminance control signal to the data driver or the scan driver.