Patent ID: 8766971

Claim:
An organic light emitting display device comprising: a display unit for displaying an image corresponding to data signals, scan signals, a first power, and a second power; a gamma correction unit for generating gamma corrected gray level analog reference voltages corresponding to gray levels by utilizing a gamma correction reference voltage; a gamma correction reference voltage generator for generating the gamma correction reference voltage switchably from the first power or from an input power supplied from outside the organic light emitting display device; a data driver for generating the data signals by utilizing image signals and the gamma corrected gray level analog reference voltages, and for transmitting the generated data signals to the display unit; a scan driver for generating the scan signals and for transmitting the generated scan signals to the display unit; and a power supply unit for generating the first power and the second power, for transmitting the generated first and second powers to the display unit, and for transmitting the generated first power to the gamma correction reference voltage generator, wherein the gamma correction reference voltage is switchably generated from a first reference voltage generated from the input power, or a second reference voltage generated from the first power, and wherein the gamma correction reference voltage generator comprises a first reference voltage generator for generating the first reference voltage from the input power.