AMOLED PIXEL CIRCUIT

摘要

The present invention provides an AMOLED pixel circuit. The third thin film transistor (T3) are located between the first, the second thin film transistors (T1, T2), and the control line (Control) is employed to input the control signal for controlling on and off of the third thin film transistor (T3), and thus controlling the AMOLED pixel circuit to measure the drive current with the current measurement circuit (1) and correcting the signal voltage with the signal voltage drive circuit (2), or displaying normally. The drive current entering the organic light emitting diode (D) in respective pixels can be corrected to solve the issues of unstable brightness and uneven display caused by the properties of the organic light emitting diode (D), which is changing along with the time and temperature, and to improve the display effect.

主权项

1. An AMOLED pixel circuit, comprising:
a first thin film transistor, and a gate of the first thin film transistor is electrically coupled to a scan line, and a source is electrically coupled to a signal line, and a drain is electrically coupled to a source of a third thin film transistor and one end of a capacitor; the third thin film transistor, and a gate of the third thin film transistor is electrically coupled to a control line (Control), and the source is electrically coupled to the drain of the first thin film transistor, and a drain is electrically coupled to a gate of a second thin film transistor; the second thin film transistor, and the gate of the second thin film transistor is electrically coupled to the drain of the third thin film transistor, a source is electrically coupled to a power source line, and a drain is electrically coupled to an anode of an organic light emitting diode; the capacitor, and one end of the capacitor is electrically coupled to the drain of the first thin film transistor, and the other end is electrically coupled to the source of the second thin film transistor; the organic light emitting diode, and the anode of the organic light emitting diode is electrically coupled to the drain of the second thin film transistor, and a cathode is electrically coupled to a common ground electrode; a current measurement circuit, and one end of the current measurement circuit is electrically coupled to the power source line, and the other end is electrically coupled to a signal voltage drive circuit; and the signal voltage drive circuit, and one end of the signal voltage drive circuit is electrically coupled to the current measurement circuit, and the other end is electrically coupled to the signal line.