Overcurrent protection circuit and method

Abstract

The invention discloses an overcurrent protection circuit and method, which are applied to a driving circuit of a liquid crystal panel. The driving circuit comprises a timing control circuit, a levelconverter and a GOA circuit. The overcurrent protection circuit is electrically connected with the timing control circuit and the level converter respectively. The overcurrent protection circuit comprises a switching unit, a current mirror source and a voltage comparator, wherein the switching unit is electrically connected with the current mirror source, the voltage output end of the timing control circuit and the voltage output end of the level converter; the current mirror source is electrically connected with the first end of a charging capacitor, and the second end of the charging capacitor is grounded; and the first input end of the voltage comparator is electrically connected with the common end between the current mirror source and the first end of the charging capacitor, the second input end is used for receiving overcurrent protection threshold voltage, and the output end is coupled with the input end of the level converter. Defects in the prior art are solved, overcurrent protection is realized, and error triggering of overcurrent protection is prevented.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to an overcurrent protection circuit and method applied to a driving circuit of a liquid crystal panel. Background technique [0002] With the development of optoelectronics and semiconductor technology, panel displays have also developed vigorously. Among many panel displays, Thin Film Transistor Liquid Crystal Display (TFT-LCD), which has superior characteristics such as high space utilization efficiency, low power consumption, no radiation, and low electromagnetic interference, has recently become the mainstream of the market. Since TFT-LCD is widely used in electronic products closely related to life, such as notebook computers, mobile phones, and TVs, people have higher and higher requirements for image quality, so the improvement of image quality has always been the goal pursued by related fields. [0003] The Gate Driver on Array (GOA for short) technology use...

AI Technical Summary

Problems solved by technology

However, since the voltage output signal CLK_OUT often has a large peak current during voltage conversion, it will make it difficult to detect the actual overcurrent or even false detection

[0006] Therefore, the existing overcurrent protection method for liquid crystal panels based on GOA circuits needs to be improved and developed.

Images