Static protection circuit, in particular static protection circuit of liquid crystal display panel and static protection circuit array of liquid crystal display panel

A technology for liquid crystal display panels and static electricity protection, which is applied to emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., and can solve the problem that the display panel cannot be displayed normally and the output level logic error To achieve the effect of improving the ability to resist positive and negative high-voltage static electricity, displaying normally, and protecting the protected circuit

Active Publication Date: 2011-07-06
BEIHAI HKC OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another problem solved by the present invention is that the output level logic error of the driving circuit of the liquid crystal display panel caused by the static pulse causes the display panel to fail to display normally.

Method used

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  • Static protection circuit, in particular static protection circuit of liquid crystal display panel and static protection circuit array of liquid crystal display panel
  • Static protection circuit, in particular static protection circuit of liquid crystal display panel and static protection circuit array of liquid crystal display panel
  • Static protection circuit, in particular static protection circuit of liquid crystal display panel and static protection circuit array of liquid crystal display panel

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Embodiment Construction

[0043] see figure 2 , The electrostatic protection circuit of the present invention includes a first discharge unit 1 , a second discharge unit 2 and a delay circuit 3 .

[0044] see figure 2 , the first discharge unit 1 is a first NMOS transistor 11, and the source of the first NMOS transistor 11 is connected to an external circuit. Through an external circuit, the first NMOS transistor 11 can obtain a positive first voltage, the threshold voltage of the first NMOS transistor 11 is the threshold voltage of the first discharge unit 1, and the gate of the first NMOS transistor 11 is connected to the drain .

[0045] see figure 2 , the second discharge unit 2 is a second NMOS transistor 21 . The drain and gate of the second NMOS transistor 21 are connected to an external circuit. Through an external circuit, the second NMOS transistor 21 obtains a second voltage with a negative polarity.

[0046] see figure 2 , the delay circuit 3 is an RC delay circuit, including a r...

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Abstract

The invention relates to a static protection circuit, in particular to a static protection circuit of a liquid crystal display panel and a static protection circuit array of the liquid crystal display panel. The static protection circuit comprises a discharging unit and a delay circuit, wherein the output end of the delay circuit is connected with the input end of the discharging unit; and by means of the delay circuit, a static pulse is delayed and the pulse width of the static pulse is increased to ensure that the pulse width of the static pulse is greater than the response time of the discharging unit so that static electricity is released through the discharging unit. Through the static protection circuit, the static pulse is prevented from entering a protected circuit.

Description

technical field [0001] The invention relates to an electrostatic protection circuit, in particular to an electrostatic protection circuit of a liquid crystal display panel. Background technique [0002] Chinese patent application No. 200610164295.1 discloses an electrostatic protection circuit. The electrostatic discharge protection circuit includes a first rectifying element, a second rectifying element and a resistance element. The first rectifying element and the second rectifying element are usually implemented with metal oxide semiconductor transistors or diodes. The electrostatic discharge protection circuit is connected to a connection pad and a protected circuit to prevent ESD pulses from flowing from the connection pad to the protected circuit. Generally speaking, the ESD pulse entering from the connection pad will be guided away from the first rectifying element or the second rectifying element. [0003] However, in the above-mentioned circuit, it takes a period ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/00G09G3/36
Inventor 曹云
Owner BEIHAI HKC OPTOELECTRONICS TECH CO LTD
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