Overcurrent protection system and overcurrent protection method for liquid crystal display panel

Abstract

The invention provides an overcurent protection system and method of a liquid crystal display panel. The system comprises a time schedule controller and a power management chip electrically connectedwith the time schedule controller; the time schedule controller comprises a current monitoring module and an I2C mainframe module electrically connected with the current monitoring module; the power management chip comprises an output module, an I2C slave module and an analog-digital conversion module; the I2C mainframe module is electrically connected with the I2C slave module, and the analog-digital conversion module is electrically connected with the I2C slave module and the output module; the analog-digital conversion module can be controlled to complete current collection and analog-digital conversion in the blank display stage of a frame of a liquid crystal display panel through cooperation of the I2C mainframe module and the I2C slave module, the accuracy of the power management chip overcurrent detection is improved, an internal circuit of the liquid crystal display panel is effectively protected, overcurrent burning of the liquid crystal display panel is avoided, and the enterprise production loss is lowered.

Description

Technical field [0001] The present invention relates to the field of display technology, and in particular to an overcurrent protection system and an overcurrent protection method of a liquid crystal display panel. Background technique [0002] With the development of display technology, flat display devices such as Liquid Crystal Display (LCD) have been widely used in mobile phones, TVs, and individuals due to their advantages of high image quality, power saving, thin body and wide application range. Various consumer electronic products, such as digital assistants, digital cameras, notebook computers, and desktop computers, have become the mainstream of display devices. [0003] Most of the liquid crystal display devices currently on the market are backlit liquid crystal displays, which include a liquid crystal display panel and a backlight module. The working principle of the liquid crystal display panel is to place liquid crystal molecules between two parallel glass substrates....

AI Technical Summary

Problems solved by technology

Due to factors such as long use time, process defects or improper lamination of components, some LCD panels may short circuit in VGH, VGL or VCOM, resulting in overcurrent, causing the LCD panel to overheat and burn out. After burning, it can only be scrapped dealt with, causing certain losses to liquid crystal display panel companies

There have been solutions on the market that directly detect the hardware over-current protection (OCP) of VGH, VGL, and VCOM through the PMIC. The over-current protection is enabled in only microseconds (us) level, which has the disadvantage of being prone to false detection

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