Patent ID: 8054255

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 generating a pulse width of a brightness control signal in accordance with the optical sensor signal; a second luminance control unit for generating a fluctuated value for the pulse width of the brightness control signal in accordance with the optical sensor signal and data of one frame of the image; and a luminance control signal generation unit for generating a luminance control signal for controlling the scan driver in accordance with the pulse width of the brightness control signal and the fluctuated value.