Liquid crystal display drive circuit

Abstract

The invention discloses a liquid crystal display drive circuit which belongs to the technical field of liquid crystal displays and is designed to solve the problems that the prior liquid crystal displays can not supply corresponding promotions for users during power failure and are not quite humanized. The liquid crystal display drive circuit comprises a time schedule controller connected with the input end of a power source, the output end of the time schedule controller is connected with a drive unit, and the output end of the drive unit is connected to the liquid crystal display, wherein the input end of the power source is also connected with a driving power supply circuit and a monitoring circuit, the output end of the driving power supply circuit is connected to the drive unit, and the output end of the monitoring circuit is connected to the time schedule controller; the input ends of the time schedule controller, the driving power supply circuit and the drive unit are also connected with an auxiliary power supply circuit; and the time schedule controller is also connected with a storage unit used for storing power-fail promoting picture data. The invention is suitable for the liquid crystal displays.

Description

technical field [0001] The invention relates to a liquid crystal display, in particular to a driving circuit of a liquid crystal display. Background technique [0002] When the liquid crystal display is powered off, due to the fast power-off speed, the driving circuit cannot complete the driving display of one frame of the picture, and cannot give the user a prompt, so the current circuit is simply turned off directly. In a typical driving circuit, the driving The power circuit part such as figure 1 shown. Among them, VDD is the input voltage of the driving power supply circuit, usually 5V; VDD is also the input voltage of the timing controller and Driver IC (driver unit) in the driving circuit (omitted in this part of the circuit); VON is the gate open voltage of the pixel; VOFF is the gate turn-off voltage of the pixel; AVDD is the driving voltage of each gray level and VCOM (reference voltage circuit), and the parts of each gray level and VCOM are also omitted in this c...

AI Technical Summary

Problems solved by technology

[0004] When the power is turned off, that is, when VDD is powered off, DVDD, AVDD, VON, and VOFF will all become zero within a few milliseconds. During this process, the drive circuit cannot work normally, and the gate cannot be completely turned off or on. As a result, the display of one frame of the picture cannot be completed, resulting in obvious horizontal bright blocks appearing on the picture, and then gradually disappearing, resulting in bad visual effects

[0005] Therefore, it can be seen that the liquid crystal display in the prior art cannot perform intelligent processing when the power is off, and give the user a corresponding prompt, and the humanization of the product is insufficient.

Images