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Gate scanning driving circuit and liquid crystal display device

A driving circuit, gate scanning technology, applied in static indicators, instruments, etc., can solve problems such as reducing circuit reliability, increasing circuit complexity, and driving waveform differences, avoiding circuit failure, improving reliability, and avoiding stoppages. The effect of pit stripes

Active Publication Date: 2020-11-06
NANJING CEC PANDA LCD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] like image 3 As shown, there is a significant difference in the driving waveform of the pull-up control node netAn between the normal level of the gate scan drive circuit (that is, the level without touch suspend) and the special level with touch suspend. After a long time of operation, it will cause The tenth thin-film transistor M10 in the two different-level drive circuit units produces different threshold voltage shifts, and then produces different gate scan signal outputs, which eventually lead to the formation of stop pit stripes at the touch pause position, that is, at the touch Black streaks appear on the same horizontal line as the paused position
[0006] On the other hand, by adding additional forward scan control signal U2D, reverse scan control signal D2U and single-side gate scan drive circuit using two start signals GSP1 and GSP3 to realize the forward and reverse scan function reduces the reliability of the circuit , also increases the complexity of the circuit

Method used

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  • Gate scanning driving circuit and liquid crystal display device
  • Gate scanning driving circuit and liquid crystal display device
  • Gate scanning driving circuit and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Such as Figure 6 Shown is a circuit diagram of Embodiment 1 of a gate scan drive circuit. The nth level drive circuit unit includes a forward and reverse scan control module 01, a pull-up module 02, a touch auxiliary module 03, a maintenance auxiliary module 04 and a first capacitor C1. The positive and negative scan control module 01, the pull-up module 02, the touch auxiliary module 03 and the maintenance auxiliary module 04 are connected to the pull-up control node netAn; the forward and reverse scan control module 01, the touch auxiliary module 03 and the maintenance auxiliary module 04 all input Low level VSS; the pull-up module 02 and the touch auxiliary module 03 are connected to the gate scanning signal line of the current stage, and the gate scanning signal line outputs the gate scanning signal Gn; the first capacitor C1 is connected to the pull-up control node netAn and the local between the gate scan signal lines. The touch auxiliary module 03 receives an ...

Embodiment 2

[0096] Figure 7 It is a schematic circuit diagram of Embodiment 2 of a gate scanning driving circuit of the present invention. The second embodiment is improved on the basis of the first embodiment, and the specific improvements are as follows:

[0097] 1. The drive circuit unit of the nth level also includes an emptying and resetting module 05, the emptying and resetting module 05, the forward and reverse scan control module 01 and the maintenance auxiliary module 04 are connected to the precharge control node netCn. The emptying and resetting module 05 includes a third thin film transistor M3, and the emptying and resetting module 05 is responsible for emptying the charge of the precharge control node netCn at the end of each frame and when switching on and off.

[0098] The control terminal of the third thin film transistor M3 inputs the clear reset signal CLR, and the two pass terminals of the third thin film transistor M3 are respectively connected to the precharge cont...

Embodiment 3

[0117] Figure 10 It is a schematic circuit diagram of Embodiment 3 of a gate scanning driving circuit of the present invention. The third embodiment is improved on the basis of the second embodiment, and the specific improvements are as follows:

[0118] 1. The forward and reverse scan control module 01 of the nth level drive circuit unit can also include a second capacitor C2, the second capacitor C2 is connected between the pull-up control node netAn and the pre-charge control node netCn, and C2 lifts the pre-charge control node during the function. Controls the potential of the node netCn.

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PUM

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Abstract

The invention discloses a grid scanning drive circuit and a liquid crystal display device. The grid scanning drive circuit comprises N levels of drive circuit units (N is greater than 4 and N is a positive integer); the n level of drive circuit unit comprises a positive and negative scanning control module, a pull-up module, a touch auxiliary module and a maintenance auxiliary module (n is less than or identical to N and greater than or identical to 1, and n is a positive integer); the positive and negative scanning module comprises a pre-charging sub-module, a node control sub-module anda pull-down sub-module; the node control sub-module is used for inputting a maintenance control signal; the pre-charging sub-module is used for pre-charging a pre-charging control node; the pull-downsub-module is used for conducting pull-down clearing on the pre-charging control node and a pull-up control node; and in a touch suspension period, the pre-charging control node is under a high potential, the maintenance control signal is under a low level, and the pull-up control node is under a low level. According to the grid scanning drive circuit provided by the invention, suspension pit horizontal grains, which are caused due to threshold voltage drift of a thin-film transistor, in a touch suspension position can be avoided, and the reliability of the circuit can be improved.

Description

technical field [0001] The present invention relates to the field of liquid crystal display, in particular to a gate scanning drive circuit and a liquid crystal display device for an embedded touch display screen. Background technique [0002] In recent years, the Gate Driver Monolithic (GDM) in the liquid crystal display has gradually been technically integrated into the liquid crystal panel by using the existing thin film transistor manufacturing process, which can not only reduce the manufacturing cost, but also improve the design Reduce left and right border sizes. In small-size display applications, in order to meet the requirements of different customer applications, the design of the gate scan driving circuit generally needs to be able to support forward scan and reverse scan switching functions. [0003] figure 1 Shown is a schematic circuit diagram of an existing gate scan drive circuit for an embedded touch display, the gate scan drive circuit includes a forward ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G3/3674
Inventor 戴超黄洪涛夏迪王志军
Owner NANJING CEC PANDA LCD TECH