GOA circuit over current protection circuit and method, and liquid crystal display device
A protection circuit and overcurrent technology, applied in the field of overcurrent protection circuit and liquid crystal display device, can solve the problems of high voltage difference and current, melting screen, panel temperature rise, etc., to prevent excessive current, avoid screen melting phenomenon, Avoid the effect of melting screen
Active Publication Date: 2017-12-29
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
[0005] Due to the high-voltage and low-voltage conversion signals such as the clock signal (CK) in the GOA circuit are many and densely arranged, and coupled with the influence of foreign matter or impurity particles in the frame glue, the risk of short circuits inside the GOA circuit is very high, and When there is a short circuit, the voltage difference and current between adjacent traces are very large, and the power at the short circuit point will also be very large, causing the temperature of the panel to rise, and even a melting screen phenomenon in severe cases, so it is necessary to carry out overcurrent protection for the GOA current (Over Current Protection, OCP)
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[0030] 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.
[0031] see figure 1 , the present invention provides an overcurrent protection circuit for a GOA circuit, which is characterized in that it includes: a level shift chip 10, a digital variable resistor (Digital Variable Resistor, DVR) 20, a voltage divider module 30, and a voltage detection module 40;
[0032] The voltage detection module 40 includes: a first input terminal, a second input terminal, and an output terminal; the first terminal of the digital adjustable resistor 20 is electrically connected to the level shift chip 10, and the The second end of the digital adjustable resistor 20 is electrically connected to the first end of the voltage dividing module 30, and the control end of the digital adjustable resistor 20 is electrically co...
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The present invention provides a GOA (Gate Driver on Array) circuit over current protection circuit and method, and a liquid crystal display device. The over current protection circuit comprises a level shift chip, a digital adjustable resister, a voltage division module and a voltage detection module. In the over current protection circuit, when the current on the output wire of clock signals of the GOA circuit is increased, the control voltage output by the voltage detection module is increased to allow the resistance of the digital adjustable resister to be increased, reduce the current of the output wire of the clock signals and finally allow the current and the resistance on the output wire of the clock signals to be balance so as to avoid too high currents in the GOA circuit and avoid the melting screen caused by short circuit of the GOA circuit.
Description
technical field [0001] The invention relates to the field of display technology, in particular to an overcurrent protection circuit and method for a GOA circuit and a liquid crystal display device. Background technique [0002] Liquid Crystal Display (LCD) has many advantages such as thin body, power saving, and no radiation, and has been widely used, such as: LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen or Laptop screens, etc., dominate the field of flat panel displays. [0003] Active Matrix Liquid Crystal Display (AMLCD) is currently the most commonly used liquid crystal display, including multiple pixels, each pixel is controlled by a thin film transistor (Thin Film Transistor, TFT), the gate of the TFT is connected to The source is connected to the scanning line extending in the horizontal direction, the source is connected to the data line extending in the vertical direction, and the drain is connected to the corresponding pi...
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IPC IPC(8): G09G3/36H02H9/02
CPCG09G3/3677G09G2330/025H02H9/02
Inventor 李文芳张先明
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD