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 a brightness of an ambient light;
• generating a first luminance control signal for controlling a gamma-corrected gray level voltage of a data signal in accordance with the optical sensor signal;
• controlling a luminance of the display area by using the data signal corresponding to the first luminance control signal;
• and
• determining whether or not a light emission time of the pixels is controlled according to the optical sensor signal.

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 adjusting a brightness of the image according to the optical sensor signal;
• and
• a second luminance control unit for adjusting the brightness of the image according to gray levels of data representing the image, wherein an operation of the second luminance control unit is in accordance with the optical sensor signal.