GOA Circuit Node Leakage Prevention via Pull-Down Module
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Solution Overview
Problem
Current Gate Driver on Array (GOA) circuits face issues with leakage and poor reliability, which affect the performance and longevity of display panels.
Innovation Solution
The proposed GOA circuit incorporates a multi-level cascaded structure with forward and reverse scanning modules, output modules, and pull-down modules, utilizing transistors and capacitors to control voltage potentials and prevent node leakage, with specific clock signal connections to enhance reliability and prevent competition paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional GOA circuits are used, then the gate driving circuit is integrated on the array substrate to omit external gate driving integrated circuits, but the circuits suffer from leakage risks and poor reliability
Solution Approach 1:
The GOA circuit is divided into multiple independent GOA units, each comprising separate forward scanning module, reverse scanning module, output module, and pull-down module. This segmentation isolates potential leakage paths and improves overall circuit reliability while maintaining integration on the array substrate.
Solution Approach 2:
A pull-down module is introduced as an intermediary component between the scanning modules and output module. This pull-down module actively manages voltage potentials at critical nodes, preventing leakage and improving reliability without compromising the integrated structure.
2Reliability
If multi-level cascaded GOA units are used with pull-down modules, then node leakage is avoided and reliability is improved, but the circuit complexity increases
Solution Approach 1:
Multiple GOA units are cascaded and merged into a unified multi-level structure where each unit follows the same modular design pattern. This systematic merging approach manages complexity through repetition of proven reliable modules while achieving improved overall reliability.
Solution Approach 2:
Each GOA unit incorporates universal modules (forward scanning, reverse scanning, output, and pull-down) that can be repeatedly instantiated. This universality allows the circuit to achieve high reliability through consistent modular design without proportionally increasing complexity, as each module serves multiple functional purposes.
3Reliability
If forward and reverse scanning modules with multiple transistors are used, then voltage potential control is improved and leakage is prevented, but the number of components and device complexity increases
Solution Approach 1:
The circuit employs different transistor configurations and connections in different modules (forward scanning, reverse scanning, output, pull-down) to optimize voltage control locally in each region. This local quality approach prevents leakage at critical nodes while maintaining overall circuit manageability through modular organization.
Solution Approach 2:
The circuit controls voltage potentials by adding temporal dimension through clock signal phases (first control clock, second control clock, third control clock) in addition to the spatial arrangement of transistors. This multi-dimensional control approach achieves precise voltage management without requiring excessive transistors, as time-multiplexed control is utilized.
Data Source
AI summary
A GOA circuit and a display panel. By using a first control clock and a third control clock in a forward and reverse scanning module to control a first node, the GOA circuit is able to avoid leakage of the first node during operation and improve the reliability of GOA circuit.