Gate driving circuit, method and liquid crystal display

Abstract

The invention provides a gate driving circuit, a gate driving method and a liquid crystal display. The gate driving circuit comprises multiple levels of shifting registers, wherein each level of shifting register comprises an upward pulling driving unit, an upward pulling unit, a resetting unit, a downward pulling unit and a complementing unit; each upward pulling unit is used for taking a clock signal at a first clock end as an output of the corresponding level shifting register at a conducting moment; and each complementing unit is connected with each upward pulling unit and is used for taking a clock signal at a second clock end as the output of the corresponding level shifting register at the conducting moment. The complementing unit of each level shifting register in the gate driving circuit provided by the invention is conducted and operated at the turn-off moment of a TFT (Thin Film Transistor) so as to control the output of the corresponding level shifting register, so that the leaping voltage is reduced, an MLG (multi-level gate) function is realized and the frame quality of the liquid crystal display is increased.

Description

technical field [0001] The invention relates to gate drive technology, in particular to a gate drive circuit, method and liquid crystal display. Background technique [0002] A liquid crystal display is a commonly used flat panel display at present, and a thin film transistor liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-LCD) is currently a mainstream product in the liquid crystal display. With the increasingly fierce competition of TFT-LCD products, various manufacturers adopt new technologies to reduce the cost of products and improve the market competitiveness of products. Among them, the GOA (Gate on Array) technology refers to integrating the gate driver (Gate Driver) of the TFT-LCD on the array substrate to form a scanning drive for the panel. Compared with traditional Chip On Flex / Film (COF) and directly bonded on glass (Chip On Glass, COG) processes, it can not only save costs, but also the panel can be designed symmetrically and beautiful...

AI Technical Summary

Problems solved by technology

[0007] However, once the temperature compensation method is used to ensure the effectiveness of the gate drive circuit, the Vgh voltage may rise above 30V, and the DC / DC IC cannot withstand such a high voltage. At this time, the MLG function will fail

Once the MLG function fails, there will be a large jump voltage at the moment when the TFT is turned off, which will affect the picture quality of the TFT panel.

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