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 the 5T1C structure and comprises a first, a second, a third, a fourth and a fifth thin film transistors (M1, M2, M3, M4 and M5), a capacitor (C1) and an organic light emitting diode (D1). The AMOLED pixel driving circuit directly acquires a threshold voltage of the fourth thin film transistor (M4), i.e. the drive thin film transistor to implement threshold voltage compensation; by inputting the data signal (Data) to the source of the fourth thin film transistor (M4), i.e. the drive thin film transistor, the circuit reads the data signal (Data) at the same time while acquiring the threshold voltage of the drive thin film transistor to promote the working efficiency of the circuit; by setting one end of the capacitor (C1) to be coupled to a gate of the fourth thin film transistor (M4), i.e. the drive thin film transistor, and the other end to be coupled to the earth (GND), the signal input of the capacitor end can be reduced to simplify the required input signal.

主权项

1. An AMOLED pixel driving circuit comprises: 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 capacitor and an organic light emitting diode;
a gate of the first thin film transistor is electrically coupled to a second reverse scan control signal, and a drain is electrically coupled to a power supply voltage, and a source is electrically coupled to a first node; a gate of the second thin film transistor is electrically coupled to a first scan control signal, and a drain is electrically coupled to a second node, and a source is electrically coupled to the first node; a gate of the third thin film transistor is electrically coupled to a first reverse scan control signal, and a drain is electrically coupled to an anode of the organic light emitting diode and a source is electrically coupled to a third node; a gate of the fourth thin film transistor is electrically coupled to a second node and one end of the capacitor, and a drain is electrically coupled to the first node, and a source is electrically coupled to the third node and a drain of the fifth thin film transistor; a gate of the fifth thin film transistor is electrically coupled to a second scan control signal, and a drain is electrically coupled to the third node and the source of the fourth thin film transistor, and a source is electrically coupled to a data signal; one end of the capacitor is electrically coupled to the second node and the gate of the fourth thin film transistor, and the other end is electrically coupled to an earth; the anode of the organic light emitting diode is electrically coupled to the drain of the third thin film transistor, and a cathode is electrically coupled to the earth; the fourth thin film transistor is a drive thin film transistor; the AMOLED pixel driving circuit directly acquires a threshold voltage of the fourth thin film transistor to implement threshold voltage compensation, and acquirement of the threshold voltage and data signal read are accomplished at the same time.