Patent ID: 8686929

Claim:
An organic light emitting display comprising: a pixel unit to display an image by receiving a data signal and a scan signal; a data driver to produce the data signal according to a video signal, and to control a voltage of the data signal according to a first offset voltage derived from optical detection of the image displayed on the pixel unit; and a scan driver to produce the scan signal, wherein the data driver comprises: a memory to store the first offset voltage and controls the voltage of the data signal according to the stored offset voltage; a shift register unit to output a control signal; a latch unit to receive the video signal in series and to output the data signal in parallel, according to the control signal; a level shifter to control a voltage of the data signal output from the latch unit, according to the first offset voltage stored in the memory; and a D/A converter to receive the data signal from the level shifter, and to convert the data signal into an analog signal.