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

Abstract

The invention provides a pixel circuit and a driving method thereof, an array substrate, a display panel and a display device. The pixel circuit comprises a light-emitting component, a driving transistor, a first storage capacitor, a light-emitting control module, a data write-in module and a compensation module. The data write-in module controls data voltage Vdata to be written into a second pole of the driving transistor in the compensation stage; and the compensation module controls a first pole of the driving transistor to be connected with the grid electrode of the driving transistor in the compensation stage to control the driving transistor to be conducted and control the conduction current of the driving transistor to flow from the second pole of the driving transistor to the first pole of the driving transistor until the electric potential of the grid electrode of the driving transistor is Vdata+Vth, wherein the Vth is a threshold voltage of the driving transistor. The problem that the threshold voltage of the driving transistor cannot be compensated in the light-emitting stage, and thus uniformity of brightness of the display panel is poor in the prior art is solved.

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, an array substrate, a display panel and a display device. Background technique [0002] AMOLED (ActiveMatrixOrganicLightEmittingDiode, Active Matrix Organic Light Emitting Diode) can be driven by the current generated by the driving transistor in the saturated state, because when the same gray scale voltage is input, different threshold voltages of the driving transistor will lead to different Drive current, causing current inconsistency. However, the uniformity of the threshold voltage Vth on the LTPS (low temperature polysilicon technology) process is very poor, and Vth also drifts, so the brightness uniformity of the existing pixel driving circuit has always been poor. [0003] Such as figure 1 As shown, the existing pixel circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth tra...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a pixel circuit and its driving method, an array substrate and a display device, which solves the problem that in the prior art, only the gate of the driving transistor can be driven in the initialization phase, and the threshold voltage of the driving transistor cannot be compensated in the light emitting phase. This leads to the problem of poor brightness uniformity of the display panel

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