Electrostatic Protection Circuit Layout for Narrow-Bezel Displays
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Solution Overview
Problem
Existing electrostatic protection circuits in display devices occupy a large area in the peripheral region of the array substrate, hindering the narrow bezel design of the display device.
Innovation Solution
An electrostatic protection circuit with a switch assembly comprising first and second switch units, each coupled to signal lines for positive and negative static electricity, sharing an active layer and arranged along a straight line, reducing the area occupied by the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive layer is used as a common electrode in an electro-optical device, then electrical connection and signal transmission are achieved, but static electricity can be generated during rubbing processes which may damage the device
Solution Approach 1:
An electrostatic protection circuit is introduced as an intermediary component between the transparent conductive layer and external environment. This circuit includes a protection electrode connected to the transparent conductive layer, and a discharge component (such as a diode or resistor-capacitor combination) that provides a controlled path for static electricity to dissipate safely, preventing damage to the electro-optical device while maintaining normal operation
Solution Approach 2:
The protection circuit converts the harmful static electricity into a controlled electrical flow through the discharge component. By providing a predetermined discharge path, the circuit transforms potentially damaging static charges into harmless current that safely dissipates through the protection electrode and external connection, turning a harmful factor into a controlled and beneficial protection mechanism
2Reliability
If an electrostatic protection circuit is added to protect the electro-optical device, then device reliability is improved, but circuit complexity increases
Solution Approach 1:
The electrostatic protection function is segmented from the main electro-optical device structure. The protection circuit is implemented as a separate, modular component with dedicated protection electrodes and discharge elements, allowing the main device to remain simple while the protection function is independently implemented and can be easily integrated or modified without affecting the core device complexity
Solution Approach 2:
The electrostatic protection circuit is designed to automatically activate when static electricity is detected on the transparent conductive layer. The circuit self-regulates the discharge process through its inherent electrical characteristics (diode directionality or RC time constants), eliminating the need for complex control logic or external intervention, thus providing reliable protection with minimal added complexity
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 reduces the area occupied by the electrostatic protection circuit, facilitating a narrow bezel design by sharing connecting lines and minimizing the impact of static electricity on internal components.
Implementation Method 1
a second electrode, serving as an electrostatic protection circuit, is provided in the array substrate
Data Source
Figure 1~2
Figure 3
AI summary
The present disclosure provides an electrostatic protection circuit, an array substrate, and a display device. The electrostatic protection circuit includes: a first voltage line, to which a high level voltage is applied; a second voltage line, to which a low level voltage is applied; and a switch assembly, including a plurality of first switch units and a plurality of second switch units arranged along a straight line and sharing an active layer. The plurality of first switch units are respectively coupled between the plurality of signal lines and the first voltage line, and are turned on in response to negative static electricity on the signal lines. The plurality of second switch units are respectively coupled between the plurality of signal lines and the second voltage line, and are turned on in response to positive static electricity on the signal lines. The plurality of signal lines are arranged in a peripheral region of the array substrate. According to the electrostatic protection circuit, the array substrate and the display device provided by the present disclosure, an area occupied by the electrostatic protection circuit can be smaller.