AMOLED PIXEL DRIVING CIRCUIT AND PIXEL DRIVING METHOD

摘要

The present invention provides an AMOLED pixel driving circuit and a pixel driving method. The AMOLED pixel driving circuit utilizes a 6T2C structure, comprising a first, a second, a third, a fourth, a fifth and a sixth thin film transistors (T1, T2, T3, T4, T5, T6), a first, a second capacitors (C1, C2) and an organic light emitting diode (OLED), and the first thin film transistor (T1) is a drive thin film transistor, and the fifth thin film transistor (T5) is a switch thin film transistor, and the first capacitor (C1) is a coupling capacitor, and the second capacitor (C2) is a storage capacitor; and a first control signal (G1), a second control signal (G2) and a third control signal (G3) are involved, and the three are combined with one another and correspond to a data signal writing stage (1), a whole compensation stage (2), a discharging stage (3) and a light emitting stage (4) one after another. The threshold voltage changes of the drive thin film transistor and the organic light emitting diode can be effectively compensated to make the display brightness of the AMOLED more even and to raise the display quality.

主权项

1. An AMOLED pixel driving circuit, comprising: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a first capacitor, a second capacitor and an organic light emitting diode; the first thin film transistor is a drive thin film transistor, and the fifth thin film transistor is a switch thin film transistor, and the first capacitor is a coupling capacitor, and the second capacitor is a storage capacitor;
a gate of the fifth thin film transistor is electrically coupled to a scan signal, and a source is electrically coupled to a data signal, and a drain is electrically coupled to a first node; a gate of the fourth thin film transistor is electrically coupled to a first control signal, and a source is electrically coupled to the first node, and a drain is electrically coupled to a second node; a gate of the sixth thin film transistor is electrically coupled to a second control signal, and a source is electrically coupled to the second node, and a drain is electrically coupled to one end of the second capacitor and a reference voltage; a gate of the third thin film transistor is electrically coupled to the first control signal, and a source is electrically coupled to a drain of the second thin film transistor and a drain of the first thin film transistor, and a drain is electrically coupled to a third node; a gate of the second thin film transistor is electrically coupled to a third control signal, and a source is electrically coupled to a power source positive voltage, and a drain is electrically coupled to the source of the third thin film transistor and a drain of the first thin film transistor; a gate of the first thin film transistor is electrically coupled to the third node, and the drain is electrically coupled to the drain of the second thin film transistor and the source of the third thin film transistor, and a source is electrically coupled to a fourth node; one end of the first capacitor is electrically coupled to the second node, and the other end is electrically coupled to the third node; the one end of the second capacitor is electrically coupled to the drain of the sixth thin film transistor, and the other end is electrically coupled to the first node; an anode of the organic light emitting diode is electrically coupled to the fourth node, and a cathode is electrically coupled to a power source negative voltage.