Discharge method and discharge regulation circuit of liquid crystal display panel and display device

Abstract

The invention provides a discharge method of a liquid crystal display panel. The discharge method comprises the steps that voltage at the voltage input end of a digital source is sampled so as to obtain sampling voltage, wherein the sampling voltage is not larger than the voltage at the voltage input end of the digital source and in positive correlation with the input voltage at the voltage inputend of the digital source; when the sampling voltage is lower than a reference voltage, a first grid-line cut-in voltage is output to a level switching circuit, wherein the reference voltage is higherthan the voltage of a discharge triggering signal, and the absolute value of the difference between the reference voltage and the voltage of the triggering signal is within a preset range; when the sampling voltage is higher than the reference voltage, a second grid-line cut-in voltage is output to the level switching circuit, wherein the absolute value of the first grid-line cut-in voltage is larger than that of the second grid-line cut-in voltage, and the polarity of the first grid-line cut-in voltage is same as that of the second grid-line cut-in voltage. The invention further provides a voltage regulating circuit and a display device. By means of the discharge method, the liquid crystal display panel can be quickly and thoroughly discharged in shutdown period.

Description

technical field [0001] The present invention relates to the field of display devices, in particular to a liquid crystal display panel discharge method, a discharge regulation circuit and a display device including the discharge regulation circuit. Background technique [0002] Due to the existence of liquid crystal capacitors in the liquid crystal display panel, the liquid crystal display panel needs to be discharged during the process of closing the liquid crystal display panel. At present, the commonly used discharge method is to detect the power-down state of the digital source voltage input terminal DVDD when the power is turned off. When the voltage of the digital power supply voltage input terminal drops to the set value, the discharge trigger signal XAO of the level conversion circuit (Level Shift IC) is triggered. The output terminal GOUT of the gate driving circuit outputs a high-level voltage, and all gate lines in the liquid crystal display panel are turned on, so...

AI Technical Summary

Problems solved by technology

[0003] However, there are still problems such as insufficient discharge, flickering and afterimages when the LCD panel is turned on next time.

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