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

Abstract

The embodiment of the invention provides a pixel circuit and a driving method thereof, an array substrate and a display device, relates to the technical field of display, and can improve the display effect. The pixel circuit comprises a first sub-pixel circuit and a second sub-pixel circuit, each of the first sub-pixel circuit and the second sub-pixel circuit comprises a reset sub-circuit, a write-in compensation sub-circuit, a driving sub-circuit, a light-emitting control sub-circuit and a light-emitting device; the reset sub-circuit is configured to input the voltage provided by the initialvoltage end to the driving sub-circuit under the control of the first reset control end; the write-in compensation sub-circuit is configured to write a signal output by the data end into the driving sub-circuit under the control of the write-in control end so as to perform threshold voltage compensation on the driving sub-circuit; and the light-emitting control sub-circuit is configured to conducta current path between the first power supply voltage end and the second power supply voltage end under the control of the enabling end, and transmit the driving current provided by the driving sub-circuit to the light-emitting device.

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 and a display device. Background technique [0002] Organic light emitting diode (Organic Light Emitting Diode, OLED) display device is one of the hotspots in the current research field. OLED has the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed. [0003] Although the OLED has many advantages, the threshold voltages of the driving transistors at different positions are different due to process deviations during the manufacturing process of the driving transistors. And as the working time is extended and the use environment changes, the threshold voltage of the driving transistor will drift. At the same time, the different positions of the pixels will lead to different voltage drops (IRDrop) of the power supply, which will affect the...

AI Technical Summary

Problems solved by technology

[0003] Although OLED has many advantages, the threshold voltage of the driving transistor at different positions will be different due to process deviation in the manufacturing process of its driving transistor.

And as the working time is extended and the use environment changes, the threshold voltage of the drive transistor will drift

At the same time, the different positions of each pixel will cause the voltage drop (IRDrop) of the power supply to be different, which will affect the current driving the OLED.

If the threshold voltage and power supply IR drop cannot be compensated, it will lead to uneven light emission of the OLED display, which will deteriorate the look and feel of the display screen

[0004] Most of the existing pixel circuit compensation technologies are PMOS voltage compensation technologies. Each sub-pixel requires independent power signal lines and data signal lines, resulting in insufficient distance between signal lines on the spatial routing, resulting in poor line quality.

[0005] As the resolution of display devices continues to increase, the distance between power signal lines and data signal lines will continue to decrease, further aggravating the risk of line defects and affecting yield

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