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Grid electrode driving circuit with forward and reverse scanning function

A gate drive circuit, forward and reverse scanning technology, applied to instruments, static indicators, etc., can solve the problems that the forward and reverse scanning modules do not have the function of maintaining the pull-up control node, and the gate drive circuit is easy to fail. The effect of improving the negative pressure stress of the gate and improving the reliability

Inactive Publication Date: 2017-02-22
NANJING HUADONG ELECTRONICS INFORMATION & TECH +1
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The main technical disadvantages of this circuit are: the positive and negative scanning module does not have the maintenance function of pulling up the control node netAn; It is easy to drift to the negative direction, and the gate drive circuit is easy to fail

Method used

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  • Grid electrode driving circuit with forward and reverse scanning function
  • Grid electrode driving circuit with forward and reverse scanning function
  • Grid electrode driving circuit with forward and reverse scanning function

Examples

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Embodiment Construction

[0014] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] The basic structure of the gate drive circuit with forward and reverse scanning functions described in the present invention is as follows: figure 2 As shown, it includes forward and reverse scan module 1 , pull-up module 2 , sustain module 3 and bootstrap capacitor 4 . Forward and reverse scanning module 1 is composed of four thin film transistors: the first thin film transistor M1, the second thin film transistor M2, the third thin film transistor M3 and the fourth thin film transistor M4. M1 and M2 are responsible for forward scanning driving, and M3 and M4 are responsible for reverse scanning. to the scan driver. When U2D is at high potential and D2U is at low potential, forward scan driving is performed; when U2D is at low potential and D2U is at high potential, reverse scan driving is performed. The two control...

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PUM

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Abstract

The invention provides a grid electrode driving circuit with forward and reverse scanning function, which comprises a forward and reverse scanning module, an upper drawing module, a maintaining module and a bootstrap capacitor. The forward and reverse scanning module is connected respectively with the upper drawing module, the maintaining module and the bootstrap capacitor. The upper drawing module and the bootstrap module are both connected with the maintaining module; the maintaining module is further connected with a constant voltage low potential; from the connection node between the upper drawing module and the maintaining module, a grid electrode scanning signal is outputted. The driving circuit of the invention further includes an emptying and resetting module. The emptying and resetting module is connected respectively with the forward and reverse scanning module, the maintaining module, and the constant voltage low potential.

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, the liquid crystal display needs to have the function of forward and reverse scanning. For example, the display screen of the mobile phone screen can be displayed normally or upside down. Bottom-up scanning is also possible. The current mainstream positive and negative scanning gate drive circuits such as figure 1 As shown, it includes forward and reverse scan module 1 , pull-up module 2 , sustain module 3 and bootstrap capacitor 4 composed of two thin film transistors. Forward and reverse scanning module 1 is controlled by U2D and D2U forward and reverse scanning control signals. When U2D is constant voltage high potential and D2U is constant voltage low potential, it performs forward scanning from top to bottom; when U2D is constant voltage Low potential, when ...

Claims

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Application Information

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IPC IPC(8): G09G3/36
CPCG09G3/3677
Inventor 戴超王志军
Owner NANJING HUADONG ELECTRONICS INFORMATION & TECH
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