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A goa drive circuit

A driving circuit and electrode technology, applied in the direction of static indicators, instruments, etc., can solve the problem of GOA liquid crystal display panels not being applicable, and achieve the effect of improving the display effect and reducing the feedthrough voltage

Active Publication Date: 2019-02-26
WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, some gate ICs have a gate EQ (Equivalent Circuit, equivalent circuit) function, which can output a gate waveform with two falling edges to reduce the feedthrough voltage when the pixel electrode is charged, but for the GOA liquid crystal display panel is inapplicable

Method used

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Embodiment Construction

[0018] The GOA driving circuit provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] refer to image 3 , a schematic diagram of an embodiment of the GOA driving circuit described in the present invention. The GOA driving circuit includes: a plurality of GOA units cascaded, and n is a positive integer. Except for the first-level and last-level GOA units, the nth-level GOA unit is used for The scan signal output by the output terminal G(n-1), the scan signal output by the output terminal G(n+1) of the n+1th GOA unit, the first clock signal CK1, the second clock signal CK2, and the scan pull-down signal CKF , Forward scanning DC control signal U2D and reverse scanning DC control signal D2U, outputting the scanning signal at the output terminal G(n). Wherein, the two clock signals of the GOA driving circuit: the pulses of the first clock signal CK1 and the second clock signal CK2 are output sequentially in tur...

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Abstract

The invention provides a GOA driving circuit. The circuit comprises a plurality of cascaded GOA units. Each grade of GOA unit comprises a positive and negative scanning control module, an output module, a pull-down module, a pull-down control module and an output feedback module. Through introducing the output feedback module formed by an eleventh film transistor, a twelfth film transistor, a thirteenth film transistor and a divider resistance, during positive scanning or negative scanning, when a scanning signal output by an output terminal G(n) is a constant voltage high level and a scanning pull-down signal is a high level, the output feedback module can pulls down the scanning signal output by the output terminal G(n) to a potential which is between the constant voltage high level and a constant voltage low level. Compared to the prior art, by using the circuit of the invention, through adjusting a time sequence of the scanning pull-down signal, the output terminal G(n) can output a waveform possessing two falling edges; a feed-through voltage of a pixel electrode during a charging process can be reduced; and a display effect of a liquid crystal display panel is improved.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a GOA drive circuit capable of reducing the feedthrough (Feedthrough) voltage when charging a pixel electrode. Background technique [0002] GOA (Gate Driver on Array, line scanning integrated on the array substrate) technology is to use the existing thin film transistor liquid crystal display (Thin Film Transistor-Liquid Crystal Display, TFT-LCD) array (Array) process to integrate the gate (Gate) A technology in which the row scanning driving circuit is fabricated on the array substrate to realize the driving method of progressively scanning the grid. GOA technology can reduce the welding (bonding) process of external IC (Integrated Circuit, integrated circuit board), has the opportunity to increase production capacity and jump product cost, and can make LCD panel (Panel) more suitable for making narrow frame or borderless display product. [0003] refer to figure 1 , a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G3/3674
Inventor 龚强
Owner WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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