Organic light emitting display device and driving method thereof

A method for driving an organic light emitting display device having a display area comprising a plurality of pixels, the method comprising:

• generating an optical sensor signal corresponding to brightness of ambient light;
• generating a first luminance control signal for controlling a pulse width of a light emission control signal in accordance with the optical sensor signal;
• generating a second luminance control signal for controlling the pulse width of the light emission control signal in accordance with data of one frame of an image;
• comparing the first luminance control signal with the second luminance control signal;
• and
• selecting one of the first luminance control signal or the second luminance control signal to control a luminance of the display area.

An organic light emitting display device for displaying an image and having a plurality of scan lines and a plurality of light emission control lines, the organic light emitting display comprising:

• a display area including a plurality of pixels coupled to the scan lines and the light emission control lines;
• a scan driver electrically coupled to the display area through the scan lines and the light emission control lines;
• an optical sensor for generating an optical sensor signal corresponding to brightness of ambient light;
• a comparator/selector for comparing a first luminance control signal with a 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;
• a first luminance control unit for providing to the comparator/selector the first luminance control signal for controlling a pulse width of a light emission control signal in accordance with the optical sensor signal;
• and
• a second luminance control unit for providing to comparator/selector the 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.