Gate drive unit and gate drive circuit

Abstract

The invention discloses a gate drive circuit, comprising multistage gate drive units which are connected in series, wherein each stage of the gate drive unit is used for outputting a corresponding gate drive signal to drive a corresponding gate line. Each stage of the gate drive unit comprises a latch, a high-level generating module, a first low-level generating module, a second low-level generating module and a coupling capacitor, and the gate drive signal output by each stage of the gate drive unit comprises high level generated by the high-level generating module, first low level generated by the first low-level generating module and second low level generated by the second low-level generating module, the gate drive single is configured to be in a third time frame of the first low level is determined by time difference between a second time frame and a fourth time frame corresponding to the high level in a first clock signal and a second clock signal, the first low level is smaller than the second low level so as to generate pull-back voltage, so that parasitic capacitance on the corresponding gate line can be compensated, and thus, a displayed image of the liquid display device can be prevented from generating a flicker phenomenon.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a gate drive circuit and a gate drive unit for a flat display device. Background technique [0002] Flat panel display devices, such as liquid crystal display devices (liquid crystal display, LCD) have many advantages such as thinness, energy saving, and no radiation, so they have gradually replaced traditional cathode ray tube (cathode ray tube, CRT) display devices and become the preferred choice of display devices. mainstream. Currently, liquid crystal display devices have been widely used in various electronic devices such as digital televisions, computers, personal digital assistants, mobile phones, and digital cameras. [0003] Taking a thin film transistor (thin film transistor, TFT) liquid crystal display device as an example, it mainly includes a liquid crystal display panel and a driving circuit. Wherein, the liquid crystal display panel includes a plurality of gate ...

AI Technical Summary

Problems solved by technology

In the second-order driving circuit and its driving method, since there is a parasitic capacitance Cgd between the gate and the drain of the thin film transistor, it will generate a feed-through voltage, and the feed-through voltage ( Usually represented by Vth), the existence of the display screen of the liquid crystal display device will cause flicker (flicker), and the display effect of the liquid crystal display device will not be utilized.

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