OLED Substrate Corner Electrostatic Protection Circuit
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Solution Overview
Problem
Special-shaped OLED display substrates, such as round screens, experience electrostatic damage at corners due to high current density and static electricity accumulation, leading to potential electrostatic discharge (ESD) issues during manufacturing and normal use.
Innovation Solution
Incorporating electrostatic protection circuits, including resistor-capacitor filter circuits and electrostatic discharge circuits with thin film transistors, into the non-display areas of the OLED substrates to eliminate static electricity at corners, thereby preventing electrostatic damage. These circuits are electrically connected to the wires at the corners and utilize filter technology or voltage regulation principles to neutralize static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wires are routed through corners in non-display areas to achieve special-shaped screens, then screen shape flexibility is improved, but electrostatic damage risk increases due to high current density and static electricity accumulation at corners
Solution Approach 1:
An electrostatic protection circuit is introduced as an intermediary component between the corner wire and ground. This circuit includes a first transistor with its gate connected to the corner wire, source connected to a second transistor, and the second transistor's source connected to ground. The intermediary circuit safely dissipates static electricity accumulated at corners through controlled discharge paths, preventing ESD damage while preserving the special-shaped screen design
Solution Approach 2:
The invention converts the harmful static electricity accumulation at corners into a beneficial protective mechanism. By detecting the electrostatic potential at corner wires through the first transistor's gate, the circuit automatically activates discharge paths through the second transistor to ground, transforming the harmful static charge into a controlled protective action that prevents damage to display pixels and circuitry
2Reliability
If electrostatic protection circuits are added to eliminate static electricity at corners, then reliability is improved, but device complexity increases
Solution Approach 1:
The electrostatic protection circuit is merged with the existing non-display area circuitry by sharing common structures such as the semiconductor layer, dielectric layers, and electrode layers. The first and second transistors are integrated into the corner region wiring structure, utilizing the same manufacturing processes and material layers as the display circuit, thereby adding protection functionality without proportionally increasing overall device complexity
Solution Approach 2:
The electrostatic protection is applied locally only at corner regions where wires change direction, rather than throughout the entire display substrate. This localized approach places protection circuits specifically at high-risk corner positions, providing targeted electrostatic protection while minimizing the overall increase in device complexity and maintaining simplicity in non-corner areas
3Ease of manufacture
If electrostatic protection circuits are integrated into the substrate, then manufacturing process simplicity is maintained, but production cost increases due to additional circuit structures
Solution Approach 1:
The electrostatic protection transistors are manufactured using the same multi-layer thin film processes as the display circuit, including simultaneous formation of semiconductor layers, dielectric layers, and electrode layers. The first and second transistors share common manufacturing steps and material depositions, allowing integration into the existing production line without requiring separate manufacturing processes, thus maintaining ease of manufacture while minimizing additional material consumption
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
Effectively reduces electrostatic damage at corners, ensuring reliable operation and preventing ESD during manufacturing and normal use, while maintaining a compact design and avoiding additional manufacturing processes.
Implementation Method 1
the first electrostatic protection circuit includes a resistor-capacitor filter circuit, and the resistor-capacitor filter circuit is configured to eliminate the static electricity generated at the corner using a resistor-capacitor filter technology
Implementation Method 2
the second electrostatic protection circuit is configured to eliminate the static electricity generated at the corner according to a voltage regulation principle
Data Source
AI summary
A display substrate and a manufacturing method therefor, and a display device. The display substrate includes a display region and a non-display region surrounding the display region, the non-display region includes a wire having a corner; and the display substrate further includes at least one electrostatic protection circuit, the electrostatic protection circuit is electrically connected with the wire at the corner, and the electrostatic protection circuit is configured to eliminate static electricity generated at the corner.