Patent ID: 7965265

Claim:
An organic light emitting display device for displaying an image and having a plurality of scan lines, a plurality of light emission control lines and a plurality of data lines, the organic light emitting display 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 brightness of ambient light; a first luminance control unit for providing a first luminance control signal for controlling a pulse width of a light emission control signal in accordance with the optical sensor signal; a second luminance control unit for providing a second luminance control signal for controlling the pulse width of the light emission control signal 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 and for selecting one of the first luminance control signal or the second luminance control signal for output to the scan driver.