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Gate scanning driving circuit and display device

A driving circuit, gate scanning technology, applied in static indicators, electrical digital data processing, instruments, etc., can solve the problems of increasing circuit complexity, instability, poor circuit functionality, etc., to avoid threshold voltage drift, The effect of narrowing the border and reducing the area occupied by the layout

Active Publication Date: 2018-11-20
NANJING CEC PANDA LCD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This instability is also related to the device itself, and there will be obvious poor functionality in the application of oxide thin film transistors
This negative drift can also lead to poor functionality of the circuit when switching scan directions
[0007] 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 display device
  • Gate scanning driving circuit and display device
  • Gate scanning driving circuit and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Such as Figure 7 Shown is a circuit diagram of Embodiment 1 of a gate scanning drive circuit. The nth level drive circuit unit includes a positive and negative scan control module 01, a pull-up module 02, a touch auxiliary module 03, a maintenance auxiliary module 04, and a memory compensation module 05 and the first capacitor C1. The positive and negative scan control module 01, the pull-up module 02, the maintenance auxiliary module 04 and the memory compensation module 05 are connected to the pull-up control node netAn; Lower the 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 Between the gate scanning signal lines of this stage.

[0099] The memory compensation module 05 of the nth level drive circuit unit includes a compensation sub-...

Embodiment 2

[0136] Figure 9 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:

[0137] 1. The touch start signal is changed to the second start signal GSP2.

[0138] The touch control signal TC1 rises from low level to high level in the stage before touch detection, and decreases from high level to low level in the stage after touch detection; the second start signal GSP2 and the touch control signal TC1 Drive waveforms such as Figure 10 As shown, the second activation signal GSP2 is at a high level only during the activation time Td before the touch control signal TC1 decreases from a high level to a low level, and is at a low level for the rest of the time.

[0139] The second start signal GSP2 is specially responsible for the start after the touch pause. Compared with the touch high level VGH2 in the firs...

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PUM

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Abstract

The invention discloses a gate scanning driving circuit. The gate scanning driving circuit comprises N(N>4) levels of driving circuit units, wherein the nth-level driving circuit unit comprises a memory compensation module, the memory compensation module comprises a compensation sub module and a secondary memory sub module, in the pre-touch detection phase, the voltage information of a pull-up control node is copied and transferred by the memory compensation module to a memory compensation node, and the secondary memory sub module is opened to input a touch control signal to a secondary memorynode; in the touch detection phase, the voltage of the pull-up control node is pulled to a second phase voltage; in the post-touch detection phase, the voltage of the pull-up control node is pulled up to a first phase voltage; in the touch detection phase, the pull-up control nodes of all levels are maintained at a low potential, and stop pit stripes are eliminated; a capacitor is not included inthe memory compensation module, so reduction of the area of the layout is facilitated. The invention further discloses a display device including the gate scanning driving circuit.

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 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 size. 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 and reverse scan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G06F3/041
CPCG06F3/0418G09G3/3677G09G3/3696
Inventor 戴超黄洪涛陈旭王志军
Owner NANJING CEC PANDA LCD TECH