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Over-current protection circuit and display panel

An overcurrent protection circuit and circuit technology, applied in the direction of protection that reacts to overcurrent, can solve the problem that the overcurrent protection mechanism is easily triggered by mistake, and achieve the effect of improving accuracy and avoiding black screen.

Inactive Publication Date: 2017-12-22
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem mainly solved by the present invention is to provide an overcurrent protection circuit and a display panel, which can solve the problem that the overcurrent protection mechanism is easily triggered by mistake

Method used

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  • Over-current protection circuit and display panel

Examples

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no. 1 example

[0014] Such as figure 1 As shown, the first embodiment of the overcurrent protection circuit of the present invention includes:

[0015] The current detection unit 10 is used to detect the output current of the clock signal, and output a prompt signal when the output current of the clock signal is abnormal;

[0016] Wherein, the clock signal is a periodic signal for outputting the gate driving signal, and the abnormal output current of the clock signal means that the output current is too large, which affects the normal operation of the transistor in the GOA circuit.

[0017] For example, the current detection current source 10 samples the clock signal to obtain the output current of the clock signal, and when the output current is greater than a preset current value, it is determined that the output current is abnormal, and the current detection unit 10 outputs a prompt signal; wherein , the preset current value is less than the maximum current that the transistors in the GO...

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Abstract

The invention discloses an over-current protection circuit and a display panel. The over-current protection circuit includes: a current detection unit, which detects output current of a clock signal and outputs a prompt signal if the output current of the clock signal is abnormal; and a countering unit, which is coupled to the current detection unit, counts the frequency of reception of the prompt signal and outputs a control signal if the frequency of reception of the prompt signal is higher than a preset threshold so that a gate driving chip is turned off, wherein the preset threshold is greater than one. Through the above way, a black screen caused by an over-current protection mechanism triggered by mistake by external interference is avoided, and the over-current protection accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an overcurrent protection circuit and a display panel. Background technique [0002] At present, the overcurrent protection mechanism of the gate driver on array (GOA) in the display panel is to cut off the current source of the GOA circuit when the input current of the level shifter is detected to increase instantaneously; however, if External interference causes the input current of the level shifter to increase instantaneously, and the overcurrent protection mechanism will be falsely triggered, resulting in a black screen. Contents of the invention [0003] The technical problem mainly solved by the present invention is to provide an overcurrent protection circuit and a display panel, which can solve the problem that the overcurrent protection mechanism is easily triggered by mistake. [0004] In order to solve the above technical problems, a technical solution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08
CPCH02H3/08
Inventor 周丽曹丹
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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