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Forward and reverse scanning gate drive circuit

A gate drive circuit, forward and reverse scanning technology, applied in the direction of static indicators, instruments, etc., can solve the problems of pre-filling module M1 asymmetry, the circuit cannot operate normally, etc., and achieve a good maintenance effect

Active Publication Date: 2019-11-19
NANJING CEC PANDA LCD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second is that the pull-down clearing module M9 of the pull-up control node is controlled by the Gn+3 signal, which is asymmetrical to the pre-fill module M1. If the reverse scan is performed, the circuit cannot operate normally.

Method used

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  • Forward and reverse scanning gate drive circuit
  • Forward and reverse scanning gate drive circuit
  • Forward and reverse scanning gate drive circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 2 As shown, a forward and reverse scanning gate drive circuit includes a forward pre-charge module (01), a reverse pre-charge module (02), a pull-up module (03), a gate scan signal maintenance module (04), Forward maintenance module (05), reverse maintenance module (06), auxiliary maintenance module (07), empty reset module (08) and bootstrap capacitor (C1); among them, the forward precharge module (01), reverse The connection points of pre-charge module (02), pull-up module (03), forward sustain module (05), reverse sustain module (06), auxiliary sustain module (07) and bootstrap capacitor (C1) are pull-up control Node (netAn); the connection point of the pull-up module (03), the gate scanning signal maintenance module (04), and the bootstrap capacitor (C1) is the gate scanning signal (Gn); the gate scanning signal maintenance module (04) , the forward sustaining module (05), the reverse sustaining module (06), and the auxiliary sustaining module (07) ...

Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 lies in that the specific circuits of the forward sustaining module (05) and the reverse sustaining module (06) are different. Such as Figure 5 As shown, in this embodiment, the forward sustaining module (05) includes a forward sustaining first TFT (M5), a forward sustaining second TFT (M6), a forward sustaining third TFT (M6A), and a forward sustaining TFT (M6A). Maintaining the fourth thin film transistor (M8) and sustaining the discharge thin film transistor (M7) in the forward direction; wherein the source of the first thin film transistor (M5) in the forward direction is connected to the forward scanning control signal (U2D), and the gate is connected to the mth- 1 clock signal (CKm-1), the drain and the source of the second TFT (M6), the source of the third TFT (M6A), and the fourth TFT (M8) The gate of the gate is connected to the source of the forward maintaining discharge thin film transistor (M7), and the...

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PUM

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Abstract

The invention discloses a forward and reverse scanning grid driving circuit. The forward and reverse scanning grid driving circuit is characterized by comprising a forward pre-charging module, a reverse pre-charging module, a pull-up module, a grid scanning signal maintaining module, a forward maintaining module, a reverse maintaining module, an auxiliary maintaining module and a bootstrap capacitor, wherein connection points of the forward pre-charging module, the reverse pre-charging module, the pull-up module, the forward maintaining module, the reverse maintaining module, the auxiliary maintaining module and the bootstrap capacitor are taken as pull-up control nodes; connection points of the pull-up module, the grid scanning signal maintaining module and the bootstrap capacitor are taken as grid scanning signals; the grid scanning signal maintaining module, the forward maintaining module, the reverse maintaining module and the auxiliary maintaining module are connected to one constant-voltage low potential. A circuit pre-charging module and a pull-down emptying module are designed symmetrically to realize forward and reverse scanning.

Description

technical field [0001] The invention relates to a gate drive circuit, in particular to a gate drive circuit with forward and reverse scanning functions. Background technique [0002] In some special applications, LCDs need to have forward and reverse scanning functions. For example, the display screen of a mobile phone screen can be displayed normally or inverted. This requires that the gate scanning drive circuit can perform automatic scanning Top-down scanning is also possible for bottom-up scanning. [0003] Such as figure 1 Shown is the gate scanning drive circuit design currently used in product design. This circuit cannot perform reverse scanning, mainly for the following reasons: [0004] One is that the maintenance module of the pull-up control node is controlled by the previous clock signal CKm-1. If the potential of the pull-up control node cannot be maintained during reverse scanning; [0005] The second is that the pull-down emptying module M9 of the pull-up c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G3/3677
Inventor 戴超
Owner NANJING CEC PANDA LCD TECH