Pixel circuit, driving method thereof and display device

Abstract

The invention provides a pixel circuit, a driving method thereof and a display device. The pixel circuit comprises a driving module, an energy storage module, an electroluminescent module, a data voltage writing module, a threshold value compensation module, a working voltage input end, a data voltage input end, a compensating voltage input end and a plurality of control signal input ends, wherein the threshold value compensation module is connected with the compensating voltage input end, the first end of the energy storage module and at least one control signal input end and is suitable for compensating the voltage of the first end of the energy storage module into the sum of a starting threshold value of the driving module and compensating voltage accessed by the compensating voltage input end by responding to a control signal accessed by the connected control signal input end. According to the pixel circuit, driving current which flows through the electroluminescent unit can be free of being influenced by the starting threshold value of the corresponding driving module, so that the problem of non-uniform display brightness caused by the shift of the starting threshold value of the driving module can be thoroughly solved.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) is one of the hotspots in the field of flat panel display research today. Superior features are increasingly being used in the field of high-performance display. Currently, OLEDs have begun to replace traditional liquid crystal displays (LCD, Liquid Crystal Display) in display fields such as mobile phones, PDAs, and digital cameras. Pixel drive circuit design is the core technical content of OLED display, which has important research significance. Unlike TFT (Thin Film Transistor, Thin Film Field Effect Transistor)-LCD, which uses a stable voltage to control brightness, OLED is current-driven and requires a stable current to control light emission. Due to the process and device aging, in the original 2T1C driving circuit (including two thi...

AI Technical Summary

Problems solved by technology

Due to the process and device aging, in the original 2T1C driving circuit (including two thin film field effect transistors and a capacitor), there is non-uniformity in the threshold voltage of the driving TFT of each pixel, which leads to the The current of each pixel OLED changes to make the display brightness uneven, thus affecting the display effect of the entire image

Images