Gate drive circuit and control method

Abstract

The invention discloses a gate drive circuit and a control method. The gate drive circuit comprises multiple stages of gate drive units, wherein each stage of gate drive unit comprises a pre-charging module, a stabilizing module, an output module, and further comprises a resetting module; the pre-charging module is used for pre-charging a first node in accordance with a previous stage of gate drive signal; the stabilizing module is used for changing voltage of a second node in accordance with a later stage of gate drive signal; the output module is used for generating a current stage of gate drive signal in accordance with voltage of the first node, the voltage of the second node and an output clock signal; and the resetting module, under the control of a switching signal, is used for changing a level state of the second node so as to compensate a threshold voltage of a selected transistor. According to the gate drive circuit and the control method of the embodiment, by adding the resetting module, the threshold voltage of the selected transistor is compensated under a standby mode, so that the service life of the selected transistor is prolonged, and moreover, circuit power consumption is reduced.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a gate drive circuit and a control method. Background technique [0002] Liquid Crystal Display (LCD) has many advantages such as lightness, lightness, energy saving, and no radiation, so it has gradually replaced the traditional cathode ray tube (CRT) display. [0003] Currently, liquid crystal displays are widely used in high-definition digital televisions, desktop computers, personal digital assistants (PDAs), notebook computers, mobile phones, digital cameras and other electronic devices. [0004] A liquid crystal display device mainly includes a display panel and a driving circuit. Wherein, the display panel includes multiple scan lines and multiple data lines, and each scan line crosses each data line to form a pixel unit. Each pixel unit includes at least one thin-film transistor (Thin-film Transistor, TFT). The driving circuit mainly includes: a gate driving circuit (...

AI Technical Summary

Problems solved by technology

When a positive voltage is applied to the gate of each switching element for an extended period of time, its threshold voltage increases, resulting in increased power consumption of the switching element and deterioration of switching characteristics

Since the gates of some switching elements in the gate drive circuit in the current technology are always in a high-level state, when these switching elements work for too long, it will lead to degradation of switching performance, which not only increases power consumption, but also will shorten the service life of these switching elements

At the same time, due to the positive drift of the threshold voltage of these switching elements, the function of the gate drive circuit may be disordered, thereby affecting the normal operation of the gate drive circuit

[0007] At present, the existing technology usually adopts the following three methods to solve the above technical problems: 1. Improve the threshold voltage drift of thin film transistors by adjusting the manufacturing process. However, this method has certain operational difficulties and cannot completely solve the problem of thin film transistors. 2. Using an AC signal to control the gate drive circuit, although this method can reduce the threshold voltage drift to a certain extent, it cannot completely solve the threshold voltage drift problem of thin film transistors; 3. In the gate A two-component time-controlled stabilization module is designed in the pole drive circuit to prolong the life of the switching element that has been working for too long. In this method, because the two groups of stabilization modules increase the layout area, it is not conducive to the realization of the liquid crystal display device. Narrow bezel

Images