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

Abstract

The invention discloses a pixel circuit and a driving method thereof, a display substrate and a display device. The pixel circuit includes a compensation sub-circuit and a storage sub-circuit. The compensation sub-circuit can adjust the potential of a control node according to the potential of a first pole of a driving transistor and adjusts the potential of a second node according to the potential of a first node, and the storage sub-circuit can adjust the potential of the control node according to the potential of the second node. Therefore, when the pixel circuit is driven, the compensationsub-circuit can write the threshold voltage of the driving transistor, the voltage of a reference power source signal, the voltage of a data signal, and the potential of a second pole of the drivingtransistor to a gate of the driving transistor by controlling the potential of each control signal, rather than writes the voltage of a first power source signal to the gate of the driving transistor.Thereby, the magnitude of the driving current output by the driving transistor is independent of the voltage of the first power source signal. Therefore, the problem of uneven display brightness dueto the voltage drop at the first power source terminal is avoided.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit and a driving method thereof, a display substrate, and a display device. Background technique [0002] Organic light emitting diode (OLED), as a current-mode light-emitting device, is increasingly used in high-performance display panels due to its characteristics of self-luminescence, fast response, and wide viewing angle. [0003] In the related art, with the development of display technology, the size of the OLED display panel becomes larger and larger. Correspondingly, the number of pixel circuits that need to be provided in the OLED display panel is also increasing, and the same power supply terminal needs to provide power signals for a large number of pixel circuits. [0004] However, when the same power supply terminal needs to provide power supply signals for a larger number of pixel circuits, the signal line provided for the power supply terminal...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a pixel circuit and its driving method, a display substrate, and a display device, which can solve the problem of uneven display brightness of a display panel caused by voltage drop in the related art. The technical solution is as follows:

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