GOA Circuit Static Electricity Protection via Filter Transistors
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Solution Overview
Problem
The GOA circuit in liquid crystal displays is prone to damage from large static electricity, which affects the stability and functionality of the display.
Innovation Solution
A GOA circuit structure incorporating an electrical potential pull-down controlling circuit with a series connection of first and second filter transistors, which filter negative and positive static electricity respectively, preventing damage from static electricity and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GOA circuit uses conventional structure without filtering components, then the device complexity is low, but the reliability is poor due to damage from static electricity
Solution Approach 1:
The patent introduces filter transistors as intermediary components between the STV signal input and the GOA sub-circuit. These filter transistors act as mediators that selectively block harmful static electricity while allowing normal signals to pass through, thereby protecting the GOA circuit without fundamentally changing its operational structure.
Solution Approach 2:
The filter transistors are configured in advance to provide protective cushioning against static electricity damage. By positioning these components upstream in the signal path, they preemptively filter out harmful voltage spikes before they can reach and damage the GOA sub-circuit, ensuring reliability without requiring complex real-time protection mechanisms.
2Reliability
If filter transistors are added to protect from static electricity, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent modifies the electrical parameters of the circuit by introducing transistors with specific threshold voltages that change the voltage characteristics of the signal path. These parameter changes enable the circuit to automatically filter static electricity based on voltage thresholds, providing protection through inherent electrical properties rather than complex control logic.
Solution Approach 2:
The filter transistors are designed to automatically perform the protection function based on the voltage characteristics of the incoming signal. When static electricity exceeds the threshold, the transistors naturally block the harmful voltage without requiring external control or complex decision-making circuits, allowing the system to protect itself through inherent transistor behavior.
3Object-affected harmful factors
If the STV signal is directly connected to the GOA sub circuit, then the ease of operation is high, but the object-affected harmful factors increase due to static electricity damage
Solution Approach 1:
The filter transistors serve as intermediary components that are seamlessly integrated into the signal path. They provide automatic filtering of harmful static electricity without requiring complex external control or manual intervention, maintaining ease of operation while protecting against damage through their inherent voltage-threshold behavior.
Data Source
AI summary
The invention disclosure a GOA circuit and a liquid crystal display. The GOA circuit including an electrical potential pull-down controlling circuit and a plurality of GOA sub circuits in cascade connection, the electrical potential pull-down controlling circuit comprising a first voltage limited transistor, a second filter transistor and a third transistor. The first voltage limited transistor, and the second filter transistor a reconnected in series and between the output terminal of the initial scanning signal, STV signal and the control terminal of the third transistor, the control terminal of the first voltage limited transistor and the first terminal of the third transistor is connected to the first power terminal and the second terminal of the third transistor is connected to the GOA sub circuit. By this design, the damage from the large static electricity to the GOA sub circuit can be avoided.