GOA gate drive circuit and liquid crystal display device

Abstract

The invention discloses a GOA gate drive circuit comprising a plurality of GOA drive units arranged in cascade connection. The GOA drive unit arranged at each level consists of a pull-up control module, a pull-up level transmission module, a first pull-down module, a pull-down maintenance module, and a second pull-down module; the second pull-down module is coupled between a gate control signal and a reference low-level signal; and the second pull-down module controlled by a pull-down signal is used for pulling down a gate control signal to the reference low-level signal, wherein the pull-down signal is provided by an independent control chip. In addition, the invention also discloses a liquid crystal display device including the GOA gate drive circuit.

Description

technical field [0001] The present invention relates to the technical field of displays, in particular to a GOA gate drive circuit, and also to a liquid crystal display device including the above GOA gate drive circuit. Background technique [0002] In an active liquid crystal display device, each pixel has a thin film transistor (TFT), its gate (Gate) is connected to the horizontal scanning line, the drain (Drain) is connected to the vertical data line, and the source (Source) is connected to to the pixel electrode. Applying sufficient voltage on the horizontal scanning line will turn on all the TFTs on the line, and at this time, the pixel electrodes on the horizontal scanning line will be connected to the data lines in the vertical direction, thereby writing the display signal voltage on the data line Into the pixel, control the light transmittance of different liquid crystals to achieve the effect of color control. At present, the driving of the horizontal scanning lin...

AI Technical Summary

Problems solved by technology

However, in the existing GOA gate drive circuit as described above, for each level of GOA circuit units, since the pull-down module 30 is transmitted by the latter two levels of GOA circuit units, the scan drive signal G n+2 Control, if any cutting is performed, for example, cutting at the nth level, at this time, the nth level is the last level of circuit unit, then there will no longer be a signal G after the cutting is completed n+2 to control the nth level pull-down module 30, causing the GOA circuit unit at this level to fail to work normally, and even causing the entire GOA gate drive circuit to fail completely

Therefore, in the current liquid crystal display, the GOA gate drive circuit cannot meet the requirements of cutting in any number of stages.

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