Patent ID: 8269701

Claim:
An organic light emitting display, comprising: a display region including pixels at crossings of data lines and scan lines; a gamma correction unit for generating a gamma correction signal; a gamma correction circuit for controlling a gray level voltage corresponding to the gamma correction signal; a data driver for generating data signals utilizing image signals and the gray level voltage, and for transferring the data signals to the data lines; and a scan driver for generating scan signals and for transferring the scan signals to the scan lines, wherein the gamma correction unit comprises: a first register for storing a first gamma correction signal; a second register for storing a second gamma correction signal, the second gamma correction signal comprising a corrected first gamma correction signal; a booster for receiving and correcting the second gamma correction signal stored in the second register to generate a third gamma correction signal; and a multiplexer for selecting the second gamma correction signal stored in the second register or the third gamma correction signal outputted from the booster, and for transferring the selected signal to the gamma correction circuit.