Patent ID: 8289234
Filing Date: 2012-10-16
Classification: G09G,H01L

Abstract:
1. An Organic Light Emitting Display (OLED) having a plurality of pixels each having a red sub-pixel, a green sub-pixel, and a blue sub-pixel, each sub-pixel comprising: a pixel driver connected to a data line, a scan line and a first power supply voltage line, and including a storage capacitor adapted to store a driving voltage supplied via the data line, and generating a predetermined driving current; and an organic light emitting diode connected between the pixel driver and a second power supply voltage line, and adapted to emit light with a brightness corresponding to the driving current; and an auxiliary capacitor directly connected between the storage capacitor and the scan line, and adapted to generate a compensation voltage to increase the driving voltage according to a scan voltage transition of a scan signal transmitted through the scan line; wherein the auxiliary capacitors of the sub-pixels have different capacitances according to an emission efficiency ratio of their respective sub-pixels, and the auxiliary capacitor comprises a first electrode directly connected to the scan line and a second electrode directly connected to a gate electrode of a driving transistor which solely generates the driving current, and wherein the compensation voltage is increased by the auxiliary capacitor solely as defined by: where Vx is the compensation voltage, Caux is a capacitance of the auxiliary capacitor, Cst is a capacitance of the storage capacitor, VVDD is a high level scan signal, and VVSS is a low level scan signal, and wherein the auxiliary capacitor of the green sub-pixel has a larger capacitance than that of the auxiliary capacitor of the red sub-pixel, the auxiliary capacitor of the red sub-pixel has a larger capacitance than that of the auxiliar capacitor of the blue sub ixel and the ca