Patent ID: 7903059

Claim:
A pixel circuit, comprising: a driving transistor; a capacitor having one end coupled to receive a first supply voltage and the other end coupled to a gate of the driving transistor; a light emitting diode having a cathode coupled to receive a second supply voltage and having an anode directly coupled to the drain of the driving transistor; a first switch coupled between the source of the driving transistor and the first supply voltage; a second switch coupled between the source of the driving transistor and the data signal; and a third switch coupled between the gate of the driving transistor and the drain of the driving transistor; wherein the gate and a drain of the driving transistor are commonly coupled to an anode of the light emitting diode, and a source of the driving transistor is coupled to receive a charging voltage during a pre-charge period, the source of the driving transistor is coupled to receive a data signal and the drain and gate of the driving transistor are coupled to each other during a programming period, and the source of the driving transistor is coupled to receive the first supply voltage during a display period; wherein the second supply voltage is independent of pixel data indicated by the data signal; the second supply voltage has a first voltage level during the pre-charge period; the second supply voltage has a second voltage level during the display period and the second supply voltage has a third voltage level during the display period, wherein the third voltage level is between the first and the second voltage levels.