Electrostatic Protection Circuit for Display Panels
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Solution Overview
Problem
Display panels face malfunction due to electrostatic discharge between data and gate wires, causing insulation breakdown and signal conduction issues, which existing electrostatic protection circuits address inadequately by discharging static electricity at a slow rate, potentially damaging the circuit.
Innovation Solution
An electrostatic protection circuit comprising multiple discharge circuits with varying turn-on voltages and configurations, including transistors and capacitors, to quickly discharge static electricity when voltages exceed preset thresholds, ensuring efficient protection without harming the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electrostatic discharge circuit is used, then the circuit structure is simple, but the discharge speed is slow and may damage the circuit
Solution Approach 1:
The electrostatic discharge circuit is segmented into multiple parallel discharge paths (first electrostatic discharge circuit and second electrostatic discharge circuit), each with different turn-on voltage thresholds. This segmentation allows the system to discharge electrostatic charges through multiple simultaneous channels, significantly increasing the discharge speed while maintaining reasonable structural complexity through modular design.
2Speed
If multiple electrostatic discharge circuits with different turn-on voltages are used, then the discharge speed increases, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by setting different turn-on voltage thresholds for the first and second electrostatic discharge circuits. The first circuit activates at a lower voltage threshold while the second circuit activates at a higher voltage threshold. This parameter differentiation enables staged discharge operations where circuits activate based on the severity of electrostatic accumulation, achieving fast discharge when needed while keeping the circuit structure manageable through parameter-based control rather than complex logic.
3Device complexity
If electrostatic discharge circuits are not used, then the device complexity is low, but electrostatic discharge causes insulation breakdown and malfunction
Solution Approach 1:
The electrostatic discharge circuits perform preliminary action by proactively detecting and discharging accumulated electrostatic charges before they reach dangerous levels that could cause insulation breakdown. The circuits are designed with turn-on voltage thresholds that trigger discharge operations in advance, preventing electrostatic accumulation from reaching critical levels. This preliminary protective action ensures insulation integrity while maintaining relatively simple circuit structure through preventive rather than reactive design.
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 and quickly discharges electrostatic charges on display panels, preventing insulation breakdown and circuit damage by activating multiple discharge paths when high voltages are detected, thus ensuring stable signal transmission.
Implementation Method 1
the first electrostatic discharge circuit is configured to, in case that an electrostatic voltage formed on the first signal wire is greater than or equal to a first preset turn-on voltage, transmit the electrostatic voltage on the first signal wire to the second signal wire
Data Source
AI summary
The present disclosure relates to an electrostatic protection circuit, an array substrate and a display device, comprising: a first electrostatic discharge circuit and a second electrostatic discharge circuit; wherein the first electrostatic discharge circuit is configured to, in case that an electrostatic voltage formed on the first signal wire is greater than or equal to a first preset turn-on voltage, transmit the electrostatic voltage on the first signal wire to the second signal wire. In case that the electrostatic voltage formed on the first signal wire is greater than or equal to a second preset turn-on voltage, the first electrostatic discharge circuit couples the voltage on the first signal wire to a first node, so that the second electrostatic discharge circuit transmits the electrostatic voltage on the first signal wire to the second signal wire.