Driving method of pixel circuit, pixel circuit, display panel and display device

Abstract

The invention discloses a driving method of a pixel circuit, the pixel circuit, a display panel and a display device. The driving method comprises the following steps: a data writing unit writes a data signal into a first node, and a resetting unit resets the potential of a second node as a reference voltage; the driving unit compensates the threshold voltage of the driving unit to the potential of the third node under the action of the data signal and the reference voltage; the second light-emitting control unit is communicated with the driving unit and the light-emitting element, the clamping unit cuts off a path between a fourth node and a second power supply voltage end, and the driving unit provides driving current for the light-emitting element so as to drive the light-emitting element to emit light; and after the second light-emitting control unit is communicated with the driving unit and the light-emitting element, the clamping unit cuts off a path between the fourth node and the second power supply voltage end. According to the embodiment of the invention, the short circuit of the data signal and the reference voltage can be avoided, and the driving current is not influenced by VDD.

Description

technical field [0001] The invention belongs to the technical field of display driving, and relates to a driving method of a pixel circuit, a pixel circuit, a display panel and a display device. Background technique [0002] Light-emitting diode display panels are widely used in various consumer products such as mobile phones, TVs, personal digital assistants, digital cameras, notebook computers, and desktop computers due to their advantages such as high image quality, power saving, thin body, and wide application range. Electronic products have become the mainstream of display panels. In the transistor-based pixel circuit, the driving transistor serves as the core transistor to provide driving current for the light-emitting diode to light up each pixel. The magnitude of the current directly determines the brightness of the pixel. However, during the working process of the pixel circuit, the threshold voltage of the driving transistor will drift due to the long-term operati...

AI Technical Summary

Problems solved by technology

However, during the working process of the pixel circuit, the threshold voltage of the driving transistor will drift due to the long-term operation of the transistor under the gate voltage, which will affect the stability of the driving current.

Moreover, all sub-pixels (Sub-pixel) are supplied with voltage by external PVDD. Due to factors such as the layout of the driving circuit and the impedance of PVDD wiring, when the product is displayed normally, the actual size of PVDD obtained by the pixel is different between different positions, which also affects the driver. The size of the current affects the uniformity of the display brightness

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