Gate Driving Circuit for Stable All-Gate-On in LCD
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Solution Overview
Problem
Conventional Gate On Array (GOA) circuits face instability in achieving the All-Gate-On function, which is crucial for liquid crystal display devices, especially when integrating with touch panels, leading to potential failures in ensuring all gate lines are conductive for a clear display effect.
Innovation Solution
A gate driving circuit with multiple-stage gate driving units and a control chip, utilizing thin-film transistors and capacitors to manage voltage levels and control signals, ensuring all scanning lines are turned on stably by coordinating first and second pulling control units, reset units, and clock signals to maintain a conductive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional GOA circuit is used to achieve All-Gate-On function, then the display device can be integrated with touch panel, but the All-Gate-On function cannot be realized stably
Solution Approach 1:
The gate driving circuit is divided into multiple gate driving units, each responsible for driving a specific gate line. Each unit includes independent control transistors (first and second control transistors) that can independently control the voltage level of corresponding gate lines, enabling stable All-Gate-On function while maintaining integration with touch panel.
Solution Approach 2:
The invention changes the voltage level parameters by introducing first and second voltage levels through control transistors. The control transistors switch between different voltage levels (first voltage level for conductive state, second voltage level for non-conductive state) to achieve stable All-Gate-On function. This parameter control mechanism ensures reliable voltage level management for each gate line.
2Adaptability or versatility
If signal interruption function is enabled in GOA circuit for touch panel collocation, then touch panel integration is achieved, but black screen awakening is required and All-Gate-On function becomes unstable
Solution Approach 1:
The control transistors are pre-configured to enable rapid voltage level switching. When All-Gate-On function is needed, the control transistors can immediately switch all gate lines to the first voltage level without requiring black screen awakening, thus performing the necessary action in advance and eliminating the delay.
Solution Approach 2:
The control transistors act as intermediaries between the signal interruption function and the gate lines. They mediate the voltage level control, allowing the signal interruption function to operate smoothly while maintaining stable control over gate lines, thus eliminating the need for black screen awakening.
Data Source
AI summary
A liquid crystal display device and a gate driving circuit are disclosed. The gate driving circuit includes multiple-stage gate driving units and a control chip. Each stage gate driving unit includes a first pulling control unit, a first pulling unit, a second pulling control unit, a second pulling unit, a first reset unit, a second reset unit. The control chip is used for pulling a first clock signal and a first voltage reference signal to a first voltage level. Accordingly, the scanning lines driven by the gate driving circuit are all turned on in order to stably realize an All-Gate-On function.