Pixel driving circuit, method, display panel and display device

Abstract

The invention provides a pixel driving circuit, a method, a display panel and a display device. The pixel drive circuit includes a drive transistor, a storage capacitor, a turn-on control module, a write control module, and a light emission control module. The turn-on control module controls the connection between the gate of the drive transistor and the first pole of the drive transistor in the threshold compensation stage and the write stage. , writing the threshold voltage of the driving transistor into the storage capacitor; the writing control module controls the data voltage to be written into the second pole of the driving transistor in the writing phase. The present invention writes the threshold voltage of the drive transistor and the data voltage on the data line to the storage capacitor step by step by turning on the control module and the write control module, and controls the drive current of the drive transistor to be independent of the threshold voltage of the drive transistor. The writing control module writes the reference voltage into the second terminal of the storage capacitor in the writing phase, and controls the driving current of the driving transistor in the lighting holding phase independent of the turn-on voltage of the light emitting element.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel driving circuit, a method, a display panel and a display device. Background technique [0002] AMOLED (Active Matrix Organic Light Emitting Diode, Active Matrix Organic Light Emitting Diode) can emit light is driven by the current generated by the driving transistor in the saturation state, because when the same gray scale voltage is input, different threshold voltages will produce different driving current, causing current inconsistency. The uniformity of Vth (threshold voltage of the driving transistor) on the LTPS (low temperature polysilicon) process is very poor, and Vth also drifts, so the brightness uniformity of the traditional 2T1C pixel unit driving circuit has always been poor. Moreover, if the existing pixel driving circuit is used, the driving current of the driving transistor is related to the turn-on voltage of the OLED. Since the Voled will chang...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a pixel driving circuit, method, display panel and display device to solve the problem that the existing technology cannot simultaneously control the driving current of the driving transistor regardless of the threshold voltage of the driving transistor and control the driving current of the driving transistor. The problem of the aging effect of light-emitting components

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