Patent ID: 8188940

Claim:
An organic electroluminescent display, comprising: a display unit including a plurality of pixel circuits; a data driver configured to provide a data signal to the display unit; a scan driver configured to provide a scan signal to the display unit; a first voltage source configured to apply a first power supply voltage to the display unit; a second voltage source configured to apply a second power supply voltage to the display unit, wherein the second power supply voltage is configured to compensate for a brightness variation due to a voltage drop of the first power supply voltage; and a switching unit electrically connected between the data driver and the second voltage source, and adapted to output the second power supply voltage to the display unit for a first period of time and output the data signal to the display unit for a second period of time in response to a predetermined control signal, wherein the second voltage source is directly connected to the switching unit, and wherein the switching unit comprises multiplexers each of which selectively outputs either the data signal or the second power supply voltage to the display unit.