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 pulse width of a brightness control signal in accordance with the optical sensor signal;
• 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 an image;
• and
• controlling a luminance of the display area using the pulse width of the brightness control signal and the fluctuated value.

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 luminance control signal generation unit for generating a luminance control signal for controlling the scan driver in accordance with a pulse width of a brightness control signal and a fluctuated value;
• a first luminance control unit for providing the pulse width of the brightness control signal in accordance with the optical sensor signal;
• and
• a second luminance control unit for providing the 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.