Gate Drive Circuit Stabilizing Pull-Down Voltage
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Solution Overview
Problem
Conventional gate drive circuits experience reliability and lifespan issues due to voltage fluctuations at the pull-down point, caused by coupling capacitance between the source and gate of thin film transistors.
Innovation Solution
A gate drive circuit with multiple stages of gate drive units connected in series, incorporating a pull-up control module, pull-up module, first and second pull-down modules, and a pull-down control module, utilizing thin film transistors to stabilize the voltage at the pull-down point and output terminals, thereby mitigating the effect of coupling capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional N-th stage GOA unit structure is used, then the device can be manufactured using conventional array manufacturing processes, but voltage fluctuations occur at the pull-down point due to coupling capacitance, decreasing reliability and lifespan
Solution Approach 1:
The gate drive circuit is divided into multiple independent stages (first stage, second stage, third stage, etc.), where each stage contains its own pull-up module and pull-down module. This segmentation allows each stage to independently control voltage at its pull-down point, preventing voltage fluctuations from affecting overall circuit reliability while maintaining compatibility with conventional manufacturing processes.
Solution Approach 2:
A second pull-down module is introduced as an intermediary component to actively counteract voltage fluctuations at the pull-down point caused by coupling capacitance. This additional pull-down module works in conjunction with the first pull-down module to stabilize voltage, thereby improving reliability without compromising manufacturability.
2Reliability
If the pull-down point voltage is actively pulled down to counteract coupling capacitance effects, then reliability improves, but the device complexity increases due to additional control modules
Solution Approach 1:
The pull-up control module and pull-down control module are merged into a unified control structure that shares common signal paths and control logic. The first pull-down module and second pull-down module are also combined to work together, reducing the need for entirely separate control circuits and thereby limiting the increase in device complexity while maintaining improved reliability.
Solution Approach 2:
The control modules are designed to perform multiple functions: the pull-up control module not only controls the pull-up operation but also coordinates with the pull-down control module to manage overall voltage stabilization. This multi-functionality reduces the need for dedicated separate circuits, balancing reliability improvement with acceptable device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively eliminates voltage fluctuations at the pull-down point and output terminals, enhancing the reliability and lifespan of the gate drive circuit by stabilizing voltages and canceling the impact of coupling capacitance.
Implementation Method 1
a coupling capacitance exists between a source and a gate of a thin film transistor in the pull-up module 102
Data Source
AI summary
The present invention provides a gate drive circuit and a liquid crystal display device. The gate drive circuit includes multiple stages of gate drive units connected in series. An N-th stage gate drive unit includes a pull-up control module, a pull-up module, a first pull-down module, a pull-down control module, and a second pull-down module. The second pull-down module includes a first thin film transistor and a second thin film transistor.