Patent ID: 9129559
Filing Date: 2015-09-08
Classification: G09G

Abstract:
1. An organic light emitting display device, comprising: a pixel unit configured to display images corresponding to a data signal, a scan signal, a first power, and a second power; a data driver configured to receive an image signal to output the data signal; a scan driver configured to output the scan signal; a power supply unit configured to generate the first power and the second power; and a controller configured to output a voltage control signal in response to a voltage level of an input power from an external source to the power supply unit to control a voltage of the first power and a voltage of the second power, and select one of a first gamma value stored in a first register and a second gamma value stored in a second register in accordance with the voltage control signal to maintain a brightness of the displayed images when the first gamma value is selected and to decrease the brightness of the displayed images when the second gamma value is selected, wherein the power supply unit comprises a first power generation unit configured to generate the first power and a second power generation unit configured to generate the second power, and wherein the first power generation unit comprises a first voltage distributor configured to distribute the voltage of the voltage control signal, a first comparator configured to compare the voltage distributed by the first voltage distributor with a first reference voltage, and a first power control block configured to generate and output the voltage of the first power in accordance with an output value from the first comparator; and wherein the second power generation unit comprises a second voltage distributor configured to distribute the voltage of the voltage control signal, a second comparator configured to compare the voltage distributed by the second voltage distributor with a second reference voltage, and a second power control block configured to generate and output the voltage of the second power in accordance with an output value from the second comparator.