Over-current protection system and over-current protection method for liquid crystal display panel

Abstract

The invention provides an over-current protection system and over-current protection method for a liquid crystal display panel. The over-current protection system is composed of a time sequence controller and a power management chip. The time sequence controller consists of an I2C host module, an over-current detection module and a time sequence control module. The power management chip includes an I2C slave module, a plurality of output channels, an analog-to-digital conversion module and a clock signal counting module. The I2C host module sends an output channel selection instruction; the clock signal counting module sends out a collection instruction based on a starting signal outputted by the time sequence control module and a plurality of clock signals; after the analog-to-digital conversion module receives the collection instruction, a driving current outputted by the corresponding output channel is collected based on the output channel selection instruction and a digital signalis obtained; and the over-current detection module determines whether the driving current is in an over-current state based on the digital signal. Therefore, over-current detection accuracy is improved and the internal circuitry of the liquid crystal display panel is protected.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an overcurrent protection system and an overcurrent protection method for a liquid crystal display panel. Background technique [0002] With the development of display technology, liquid crystal displays (Liquid Crystal Display, LCD) and other flat display devices are widely used in mobile phones, televisions, personal 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 backlight 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 in two parallel glass substrates. There are many vertical and horizontal small wires between the two 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 has been a solution on the market to directly detect the hardware over-current protection (OCP) of VGH, VGL and VCOM through the PMIC. The overcurrent protection is activated in only microsecond (us) level, which has the disadvantage of easy false detection

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