Pixel circuit and driving method thereof, display panel and display device

Abstract

The embodiment of the invention discloses a pixel circuit and a driving method thereof, a display panel and a display device. A data writing module of a pixel circuit can write data signals into a grid electrode of a driving transistor and a first pole plate of a storage capacitor in the data writing stage. A reset module can write a reset signal into a second polar plate of a storage capacitor ina data writing stage. A threshold value compensation module can write a threshold value compensation signal into a second polar plate of the storage capacitor in a threshold value compensation stage,so that the potential of a first polar plate of the storage capacitor is adjusted to a first potential, and threshold value compensation is carried out on the driven transistor; wherein the thresholdcompensation signal is greater than the reset signal; the driving transistor can provide driving current for the organic light-emitting element in a light-emitting stage so as to drive the organic light-emitting element to emit light. The pixel circuit provided by the embodiment of the invention is simple in structure and relatively small in size, and threshold compensation can be realized.

Description

technical field [0001] The present invention relates to the field of driving technology, in particular to a pixel circuit and a driving method thereof, a display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) displays have the advantages of self-illumination, low driving voltage, high luminous efficiency, short response time, flexible display, etc., and become the display with the most development potential at present. [0003] The OLED element of the OLED display is a current-driven element, and a corresponding pixel driving circuit needs to be provided to provide a driving current for the OLED element so that the OLED element can emit light. A pixel driving circuit of an OLED display generally includes a driving transistor, a switching transistor and a storage capacitor. The driving transistor can generate a driving current for driving the OLED element according to the voltage of its gate. However, due to reasons such as tech...

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a pixel circuit and its driving method, a display panel, and a display device, so as to solve the problem in the prior art that the gate voltage of the driving transistor changes due to the influence of the leakage current, which affects the light-emitting brightness of the light-emitting element and causes Uneven display, technical problems that affect the display effect

Images