Liquid crystal display device and overcurrent protection method thereof

A liquid crystal display device and overcurrent protection technology, which is applied to static indicators, instruments, etc., can solve the problems of not being able to reflect the situation of multiple channels in time, prevent false triggering of the overcurrent protection mechanism, and reduce large current leakage Probability, the effect of improving detection accuracy

Active Publication Date: 2019-07-26
SUZHOU CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing overcurrent protection circuit detects each channel of the level shifter separately, and detects it constantly. This detection method cannot timely reflect the situation when multiple channels are short-circuited.

Method used

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  • Liquid crystal display device and overcurrent protection method thereof
  • Liquid crystal display device and overcurrent protection method thereof
  • Liquid crystal display device and overcurrent protection method thereof

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Embodiment Construction

[0038] In order to further illustrate the technical means adopted by the present invention and its effects, the following describes in detail in conjunction with preferred embodiments of the present invention and accompanying drawings.

[0039] see figure 1 , the present invention provides a liquid crystal display device, comprising: a level shifter 10 and a GOA circuit 20 and an overcurrent protection circuit 30 respectively connected to the level shifter 10;

[0040] The overcurrent protection circuit 30 includes a current detection unit 31 connected to the level shifter 10 and a protection trigger unit 32 connected to the current detection unit 31;

[0041] The level shifter 10 is used to transmit multiple clock signals corresponding to each frame to the GOA circuit 20;

[0042] The current detection unit 31 is used to detect the current value of each clock signal before the last clock signal of the plurality of clock signals corresponding to each frame changes from low le...

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PUM

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Abstract

The invention provides a liquid crystal display device and an overcurrent protection method thereof. The liquid crystal display device comprises a level converter, and a GOA circuit and an over-current protection circuit which are respectively connected with the level converter. The overcurrent protection circuit comprises a current detection unit connected with the level converter and a protection trigger unit connected with the current detection unit. The level converter is used for transmitting a plurality of clock signals corresponding to each frame of picture to the GOA circuit. The current detection unit is used for detecting the current value of each clock signal before the last clock signal in the plurality of clock signals corresponding to each frame of picture is changed from a low level to a high level, and the protection trigger unit is used for closing the level shifter when two adjacent frames of images detect that the current value is greater than a preset threshold value, so that an over-current protection mechanism is prevented from being triggered by mistake, the detection precision is improved, and the false triggering probability is reduced.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a liquid crystal display device and an overcurrent protection method thereof. Background technique [0002] Active Matrix Liquid Crystal Display (AMLCD) is currently the most commonly used display device, the active matrix liquid crystal display includes a plurality of pixels, each pixel has a thin film transistor (Thin Film Transistor, TFT), the The gate of the TFT is connected to the scanning line extending in the horizontal direction, the drain of the TFT is connected to the data line extending in the vertical direction, and the source of the TFT is connected to the corresponding pixel electrode. If enough positive voltage is applied to a scanning line in the horizontal direction, all TFTs connected to the scanning line will be turned on, and the data signal voltage loaded on the data line will be written into the pixel electrode, thereby displaying the picture . Array subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3648G09G2330/025
Inventor 张先明
Owner SUZHOU CHINA STAR OPTOELECTRONICS TECH CO LTD
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