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 node control module, a data writing module, a light emitting control module, a light emitting element, a reset signal end, a data signal end and a first power supply end. The node control module is used for storing a reset signal of a reset signal end and resetting a grid electrode of the driving transistor in a reset stage, and controlling a power supply signal of a first power supply end to be written into the grid electrode of the driving transistor in a light emitting stage; the data writing module is used for writing a data signal of a data signal end into a grid electrode of the driving transistor in a data write-in stage, and compensating a threshold voltage of the driving transistor to the grid electrode of the driving transistor; the light-emitting control module is used for controlling the driving transistor to supply driving current generated according to the potential of the grid electrode to the light-emitting element in a light-emitting stage so as to drive the light-emitting element to emit light.

Description

technical field [0001] The embodiments of the present invention relate to the field of display technology, and 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 may be a voltage-driven element or a current-driven element. For a current-driven element, it is necessary to set a corresponding pixel circuit to provide a driving current for the OLED element, so that the OLED element can emit light. Usually, the pixel circuit includes a driving transistor. By writing a data signal to the gate of the driving transistor and performing threshold value capture, the driving transistor provides a corresponding driv...

AI Technical Summary

Problems solved by technology

Since different luminance levels of OLED elements correspond to different driving currents, and different driving currents correspond to the gate potential of the driving transistor, that is, different driving currents correspond to different data signals, when the OLED element has a large brightness variation range , it is necessary to provide the gate of the driving transistor with a data signal having a large voltage variation range, which is not conducive to the low power consumption of the pixel circuit, that is, to the low power consumption of the display panel including the pixel circuit.

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