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

Abstract

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. The pixel circuit includes a switch transistor, a storage capacitor, a drive transistor, and a light-emitting element, and also includes a charge and discharge module connected to the drain of the switch transistor and capable of real-time control of the charge and discharge state; when the switch transistor is turned on to conduct current The charging and discharging module implements charging, and when the switching transistor is turned off and the storage capacitor is insufficient, the charging and discharging module implements discharging to supply power to the light-emitting element. Therefore, the present invention not only does not need to perform threshold voltage compensation, but reduces the substrate space occupied by the threshold voltage compensation circuit, so as to make full use of the substrate space to increase the pixel density, and can avoid more power consumption due to frequent refreshing of switching transistors, so as to greatly reduce Power consumption; at the same time, it can intelligently control different duty cycles and time allocation, thereby realizing multi-gray scale display.

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] Organic light-emitting display (Active Matrix Organic Light Emitting Diode, referred to as AMOLED) is one of the hot spots in the field of flat panel display research today. Compared with liquid crystal displays, OLED has low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed, etc. Advantages, at present, OLED has begun to replace traditional LCD display screens in display fields such as mobile phones, PDAs, and digital cameras. Pixel drive circuit design is the core technical content of AMOLED display, which has important research significance. [0003] Among them, unlike TFT-LCD which uses a stable voltage to control brightness, OLED is current-driven and requires a stable current ...

AI Technical Summary

Problems solved by technology

[0003] Among them, unlike TFT-LCD which uses a stable voltage to control brightness, OLED is current-driven and requires a stable current to control light emission; in the most primitive 2T1C pixel circuit (such as figure 1 ), when displaying a static image, the switching transistor needs to be continuously refreshed, and the switching transistor will generate a certain amount of power consumption during the refreshing process, thereby increasing the power consumption

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