Patent ID: 7557784
Filing Date: 2009-07-07
Classification: G09G

Abstract:
1. A pixel comprising: first and second organic light emitting diodes (OLEDs); a driving circuit commonly connected to the first and second OLEDs to drive the first and second OLEDs; a switching circuit connected between the first and second OLEDs and the driving circuit to sequentially control the driving of the first and second OLEDs using first and second emission control signals; and a reverse bias circuit for selectively applying a reverse bias voltage comprising at least one of the first and second emission control signals to the first and second OLEDs, wherein the driving circuit comprises: a first transistor for receiving a first power of a first power source to selectively supply a driving current corresponding to a first voltage applied to a gate at the first transistor to the first and second OLEDs; a second transistor for selectively applying a data signal to a first electrode of the first transistor in accordance with a first scan signal; a third transistor for selectively connecting the first transistor to serve as a diode in accordance with the first scan signal so that an electric current can flow through the first transistor; a capacitor for storing the voltage applied to the gate of the first transistor while the data signal is applied to the first electrode of the first transistor and for maintaining the stored voltage at the gate of the first transistor for a period when at least one of the first and second OLEDs emits light; a fourth transistor for selectively applying an initializing voltage to the capacitor in accordance with a second scan signal; a fifth transistor for selectively applying the first power of the first power source to the first transistor in accordance with the first emission control signal; and a sixth transistor for selectively applying the first power of the first power source to the first transistor in accordance with the second emission control signal.