GOA (Gate Driver On Array) circuit of liquid crystal display panel and display device

A liquid crystal display panel and circuit technology, applied in static indicators, instruments, etc., can solve the problems of lower potential of the second circuit point, easy leakage of thin film transistors, insufficient thrust of scanning signals, etc. Improve the effect of driving force

Active Publication Date: 2017-02-22
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a COA circuit and a display device of a liquid crystal display panel, to solve the problem in the prior art that the source and drain of a thin film transistor in the pull-down sustaining unit of the COA circuit of the liquid crystal display panel are respectively connected to the second circuit Point and constant voltage low-level source, so that the thin film transistor is easy to leak, and the potential of the second circuit point is reduced, resulting in insufficient thrust of the scanning signal

Method used

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  • GOA (Gate Driver On Array) circuit of liquid crystal display panel and display device
  • GOA (Gate Driver On Array) circuit of liquid crystal display panel and display device
  • GOA (Gate Driver On Array) circuit of liquid crystal display panel and display device

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Experimental program
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Embodiment 1

[0039] Please refer to figure 1 , figure 1 It is a schematic diagram of the overall structure of a COA circuit of a liquid crystal display panel in this embodiment, from figure 1 It can be seen that a COA circuit of a liquid crystal display panel of the present invention is used to drive cascaded scan lines, and includes a plurality of cascaded GOA units, wherein the Nth level GOA unit controls the Nth level scan line Charging is controlled, and the Nth-level GOA unit includes:

[0040] A pull-down sustaining circuit unit 300, configured to maintain low the scan signal corresponding to the scan line;

[0041] a pull-down circuit unit 200, configured to pull down the scan signal corresponding to the scan line;

[0042] a pull-up circuit unit 100, configured to pull up the corresponding scan signal of the scan line;

[0043] A pull-up and sustain circuit unit 400, configured to maintain and pull up the scan signal of the corresponding scan line;

[0044] The downlink circui...

Embodiment 2

[0070] A display device in this embodiment includes a liquid crystal display panel, and the liquid crystal display panel includes the COA circuit described in Embodiment 1. Since the COA circuit has been described in detail in Embodiment 1, it will not be repeated here. Discuss it.

[0071] In a display device of the present invention, the COA circuit of its liquid crystal display panel connects the source and the drain of a thin film transistor of the pull-down sustaining circuit unit 300 to the second circuit point Q(N) and the scan line of the current stage respectively, thereby reducing the The potential difference between the source and the drain of the thin film transistor at the second circuit point Q(N) is reduced, so that the thin film transistor is not prone to electric leakage, and at the same time, the driving force of the scanning signal is improved to ensure the continuous transmission of the device.

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Abstract

The invention provides a GOA (Gate Driver On Array) circuit of a liquid crystal display panel and a display device. The GOA circuit comprises a plurality of cascaded GOA units, wherein the Nth-level GOA unit performs control on charging of an Nth-level scanning line. The Nth-level GOA unit comprises a pull-down holding circuit unit, a pull-down circuit unit, a pull-up circuit unit, a pull-up holding circuit unit, a transfer circuit unit, a bootstrap capacitor, a constant-voltage low level source and a constant-voltage high level source, wherein the gate of a thin film transistor of the pull-down holding circuit unit is connected to a first circuit point, the source and the drain of the thin film transistor are respectively connected to the constant-voltage low level source and the Nth-level scanning line. According to the invention, potential difference of the source and the drain of the thin film transistor at a second circuit point is relieved, so that the thin film transistor is enabled to be not prone to electric leakage. Meanwhile, a driving force of scanning signals is improved, and continuous transmission of the device is ensured.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of liquid crystal display, in particular to a COA circuit of a liquid crystal display panel and a display device. [0003] 【Background technique】 [0004] Liquid crystal display (Liquid Crystal Display, LCD) and other flat display devices are widely used in mobile phones, televisions, personal digital assistants, digital cameras, notebooks, etc. Various consumer electronic products such as computers and desktop computers have become the mainstream of display devices. Most of the liquid crystal display devices currently on the market are backlight liquid crystal displays, which include a liquid crystal display panel (TFT-LCD) and a backlight module. The working principle of the liquid crystal display panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The direction of the liquid crystal molecules ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3677
Inventor 吕晓文廖聪维
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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