PIXEL DRIVER CIRCUIT, DISPLAY PANEL AND DRIVING METHOD THEREFOR

摘要

A pixel driver circuit including a first transistor, second transistor, third transistor, fourth transistor, first capacitor, second capacitor, and organic light-emitting diode is provided. A drain of the second transistor is coupled to a cathode of the organic light-emitting diode, and an anode of the organic light-emitting diode is couple to a power line. A source of the second transistor is respectively coupled to drains of the third transistor and the fourth transistor. A source of the third transistor is coupled to a gate of the second transistor, and gates of the third transistor and the fourth transistor receives a compensation control voltage. A source of the fourth transistor is grounded. A shift of the threshold voltage of an AMOLED can be compensated in an embodiment of the present invention, whereby uniformity between a picture and grayscales of the organic light-emitting diodes can be improved.

主权项

1. A pixel driver circuit, comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor, and an organic light-emitting diode, a gate of the first transistor coupled to a scan line, a drain of the first transistor coupled to a data line, a source of the first capacitor coupled to one end of the first capacitor, another end of the first capacitor coupled to a gate of the second transistor, a drain of the second transistor coupled to a cathode of the organic light-emitting diode, an anode of the organic light-emitting diode coupled to a power line, a source of the second transistor respectively coupled to a drain of the third transistor and a drain of the fourth transistor, a source of the third transistor coupled to a gate of the second transistor, a gate of the third transistor and a gate of the fourth transistor utilized to receive a compensation control voltage, a source of the fourth transistor being grounded, wherein the compensation control voltage is utilized to control on and off states of the third transistor and the fourth transistor, whereby a current passing through the organic light-emitting diode is unrelated to a threshold voltage of the second transistor.