Ground Wiring Pattern for Electrostatic Discharge Protection in Tiling Displays
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Solution Overview
Problem
Display body devices for tiling displays are highly sensitive to static electricity due to exposed wires and elements positioned near the ends, leading to potential electrostatic discharge issues that existing countermeasures struggle to address effectively.
Innovation Solution
A display body device with a wiring pattern exposed on its outermost side, having a potential equal to ground, is implemented to selectively direct static electricity to the ground, preventing it from reaching sensitive elements, and an insulating film is used to enhance electrostatic withstanding voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If elements are disposed to the vicinity of an end of the display body device to achieve tiling display without joints, then the display quality and continuity are improved, but the sensitivity to static electricity increases and electrostatic discharge damage becomes more likely
Solution Approach 1:
A ground wiring pattern is introduced as an intermediary component between the functional elements and the external environment. This ground wiring pattern acts as a mediator that intercepts static electricity before it can reach the functional elements, thereby protecting them while maintaining the tiling display configuration with elements at the ends.
Solution Approach 2:
The invention converts the harmful static electricity into a beneficial protective mechanism by providing a designated path (ground wiring pattern) for static charge dissipation. Instead of allowing static electricity to randomly discharge and damage functional elements, the ground wiring pattern guides the static charge safely to ground, transforming a harmful factor into a controlled protective feature.
2Reliability
If peripheral patterns are exposed on the top surface to release static electricity, then electrostatic breakdown protection is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts the essential protective function from the complex peripheral pattern configuration and concentrates it into a simplified ground wiring pattern. Instead of requiring multiple exposed peripheral patterns on the top surface, the design uses a single ground wiring pattern that extends to the end surface, thereby maintaining electrostatic protection while reducing structural complexity.
Solution Approach 2:
The invention transitions the ground wiring pattern from a two-dimensional top-surface configuration to a three-dimensional structure that extends through the substrate thickness to the end surface. This dimensional change allows the ground connection to be established more simply by exposing the wiring pattern at the end surface rather than requiring complex peripheral patterns on the top surface.
3Reliability
If shielding peripheral electrodes are provided to countermeasure EMI, then electromagnetic interference protection is improved, but the visibility and appearance of the display are degraded
Solution Approach 1:
The invention extracts the electromagnetic shielding function from the peripheral electrode structure and relocates it to the ground wiring pattern that is already necessary for electrostatic protection. By using the same ground wiring pattern for both ESD and EMI protection, the design avoids adding visible shielding structures that would degrade display appearance while maintaining both protective functions.
4Reliability
If ground wiring pattern is extended to the end surface, then electrostatic discharge path is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The ground wiring pattern is designed to serve multiple functions: it provides electrostatic discharge path, establishes ground reference potential, and offers EMI shielding. This multi-functionality reduces the need for separate structures and simplifies the overall manufacturing process, as the same wiring pattern fulfills multiple protective roles without requiring additional precision-critical features.
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
This configuration significantly improves the electrostatic withstanding voltage of the display body device, effectively discharging static electricity to the ground without damaging the functional elements, while maintaining the appearance and functionality of the tiling display.
Implementation Method 1
selectively flow static electricity applied to the display body device to the first wiring pattern having the potential equal to the ground
Data Source
AI summary
To provide a display body device and a display apparatus that allow for improvement of an electrostatic withstanding voltage, a display body device 10E includes: a wiring substrate 30; a light-emitting element 12 and a drive IC 13 that are disposed on the wiring substrate 30; and a wiring pattern 36 that is disposed on an outermost side, and is at least partially exposed and has a potential equal to a ground of each of the light-emitting element 12 and the drive IC 13.