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. The pixel circuit comprises a driving transistor, a storage capacitor, a data writing module, a threshold compensation module and an organic light-emitting element, wherein the data writing module is electrically connected with a grid electrode of the driving transistor anda first pole plate of the storage capacitor and is used for writing a data signal into the grid electrode of the driving transistor and the first pole plate of the storage capacitor in a data writingstage; the threshold compensation module is electrically connected with a second pole plate of the storage capacitor and is used for adjusting the potential of the second pole plate of the storage capacitor to be a first potential in a data writing stage, adjusting the potential of the second pole plate of the storage capacitor to be a second potential in a threshold compensation stage so as to adjust the potential of the first pole plate of the storage capacitor to be a third potential, and compensating the threshold voltage of the driving transistor; the driving transistor is electrically connected with the organic light-emitting element and used for providing driving current for the organic light-emitting element in the light-emitting stage and driving the organic light-emitting element to emit light.

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...

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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

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