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Pixel circuit, display panel and display device

A pixel circuit and voltage technology, which is applied in the field of pixel circuits, display panels and display devices, and can solve problems such as the influence of signal voltage retention rate

Active Publication Date: 2020-05-19
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, an embodiment of the present invention provides a pixel circuit, a display panel, and a display device, which are used to solve the problem that the current leakage of the relevant loop formed by the switch TFT in the existing pixel circuit has a direct impact on the signal voltage retention rate in the storage capacitor Cst, And the problem of visual flicker (Flicker)

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  • Pixel circuit, display panel and display device
  • Pixel circuit, display panel and display device
  • Pixel circuit, display panel and display device

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation manners of the pixel circuit, the display panel and the display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] At present, the pixel circuit of low temperature polysilicon (LTPS for short) AMOLED commonly used in related technologies, such as figure 1 As shown, it includes six switching transistors (T1, T2, T4-T7), a driving transistor T3 and a storage capacitor Cst. Usually, T1 and T2 will use two TFTs in series to reduce leakage. When the first scanning signal line Sn-1 is at a low level, it resets the gate N1 point of the driving transistor T3 and the OLED anode; when the second scanning signal line Sn is at a low level, the data voltage Vdt is written, and at the same time, the voltage of the driving transistor T3 is obtained. The threshold vol...

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Abstract

The invention discloses a pixel circuit, a display panel and a display device. According to the invention, by adjusting the magnitude ratio of a first compensation capacitor to a second compensation capacitor added in a pixel circuit , the voltage of a third node and the voltage of a fourth node can be adjusted, the voltage of the third node is made greater than that of the first node, and the voltage of the fourth node is made smaller than the voltage of the first node, thus, the third node reversely charges the first node and the first node leaks electricity to the fourth node; therefore, complementation of the charging process and the electric leakage process of the first node can be realized, so that the potential of the first node is balanced, electric leakage of the first node can bereduced, the signal voltage retention rate of a storage capacitor in a pixel circuit is improved, flicker-free display and low-frame-frequency driving are realized, and the display quality of a display product is further improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit, a display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) is one of the hot spots in the field of flat panel display research today. Compared with Liquid Crystal Display (LCD), OLED display has low energy consumption, low production cost, self-illumination, and wide viewing angle. and quick response. At present, OLED displays have begun to replace traditional LCD displays in display fields such as mobile phones, tablet computers, and digital cameras. [0003] Unlike LCDs that use a stable voltage to control brightness, OLEDs are driven by current and require a stable current to control their light emission. Among them, the basic function of the active matrix organic light-emitting diode (AMOLED) display pixel circuit is: refresh the display signal at the beginning of the frame period, use the storage capacitor Cst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3266G09G3/3291
CPCG09G3/3266G09G3/3291G09G3/3233G09G2300/0819G09G2300/0852G09G2310/0202G09G2320/0247G09G2360/16G09G2300/0842G09G2320/043G09G2310/0251G09G2310/0262H10K59/131
Inventor 王丽郑灿
Owner BOE TECH GRP CO LTD
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