GOA Signal Line Over-Current Protection With Variable Resistance
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Solution Overview
Problem
Display panels are susceptible to damage from excessive current due to abnormal operating states, external interference, or short-circuits in the gate driver circuit, leading to issues like horizontal stripes, crosstalk, screen flickering, and reduced display quality.
Innovation Solution
An over-current protection circuit with a current comparison module, discharge control module, and variable resistance module, including a memristor, to manage current flow and prevent excessive current from damaging the display panel components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate driver circuit operates without over-current protection, then the circuit structure is simple and operation is easy, but the display panel is vulnerable to damage from excessive current causing horizontal stripes, crosstalk, screen flickering, and reduced display quality
Solution Approach 1:
The protection circuit performs preliminary detection of current magnitude through the current comparison module before damage can occur. By continuously monitoring and comparing target line current against reference current, the system prepares protection in advance, switching the variable resistance module to low-resistance state when over-current is detected, preventing damage before it happens.
Solution Approach 2:
The variable resistance module acts as an intermediary component between the target line and ground. It dynamically adjusts its resistance state based on current conditions, serving as a mediator that safely dissipates excessive current through controlled resistance changes without directly shorting the circuit, thus protecting other components.
2Reliability
If a protection circuit is added to prevent over-current damage, then display panel reliability is improved, but the circuit structure becomes more complex
Solution Approach 1:
The variable resistance module dynamically changes its resistance state based on real-time current conditions. It transitions between high-resistance and low-resistance states according to the detected current magnitude, providing adaptive protection rather than static protection, which optimizes the balance between reliability and circuit simplicity.
Solution Approach 2:
The current comparison module provides continuous feedback about the target line current status to the variable resistance module. This feedback mechanism allows the protection circuit to automatically adjust its protection level based on actual operating conditions, enabling intelligent protection without requiring complex external control systems.
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 over-current protection circuit effectively prevents excessive current from impacting the display panel lines and components, reducing damage and maintaining display quality by dynamically switching resistance states based on current levels.
Implementation Method 1
the variable resistance module has at least a high-resistance state and a low-resistance state; when a current in the target line is greater than a current of the reference power supply, the variable resistance module is in the low-resistance state, and when the current in the target line is less than the current of the reference power supply, the variable resistance module is in the high-resistance state
Data Source
AI summary
An over-current protection circuit includes a current comparison module, a discharge control module, and a variable resistance module. The current comparison module is connected to a reference power supply and a target line. The discharge control module includes a first transistor. The control end of the first transistor is connected to the output end of the current comparison module, the first end and the second end of the first transistor are connected to the target line and the variable resistance module, respectively. The variable resistance module has at least a high-resistance state and a low-resistance state. The over-current protection circuit is used to protect the GOA signal line of the display panel.