A pixel circuit, its driving method and display panel

Abstract

The invention discloses a pixel circuit, a driving method thereof and a display panel. The pixel circuit includes a first transistor, a second transistor, a third transistor, a drive transistor, a first capacitor, a second capacitor and an organic light-emitting element; the first transistor The control end of the pixel circuit is electrically connected to the first scan signal input end of the pixel circuit; the control end of the second transistor is electrically connected to the first light emission control signal input end of the pixel circuit; the control end of the third transistor is electrically connected to the second light emission control signal input end of the pixel circuit The signal input end is electrically connected; the first pole of the first capacitor is electrically connected with the data signal input end of the pixel circuit, and the second pole of the first capacitor is electrically connected with the second end of the first transistor. The embodiment of the present invention is beneficial to increase the pixel density; and by arranging the first capacitor and the second capacitor in the pixel circuit, the adjustment range of the data signal voltage is expanded, which is beneficial to the gray scale modulation and makes the display effect better.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of organic light-emitting display, and in particular, to a pixel circuit, a driving method thereof, and a display panel. Background technique [0002] Organic light-emitting display panels are more and more widely used in the display of mobile phones, watches, etc., especially organic light-emitting display panels with low-temperature polysilicon (LTPS) as the backplane are showing a trend of accelerated development. [0003] The organic light emitting display panel includes a pixel circuit for driving the organic light emitting device to emit light, and the display driving circuit usually consists of a plurality of thin film transistors (Thin Film Transistor, TFT) and capacitors. For LTPS backplanes, due to the existence of crystal grains and grain boundaries in polysilicon, the uniformity is relatively poor, and the threshold voltage of thin film transistors varies. When the pixel ci...

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Problems solved by technology

[0004] However, the circuit architecture of existing pixel circuits is relatively complex. Under the development trend of smaller and smaller pixel sizes, too many TFTs and long-channel TFTs are not conducive to layout drawing, which is not conducive to improving pixel density.

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