Discontinuous Shield Wires for Touch Sensor Short-Circuit Prevention
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Solution Overview
Problem
Short-circuit defects frequently occur in touch sensors, particularly in structures like POL Direct Transfer (PDT) and No Substrate Touch (NST), due to environmental factors such as water vapor and high temperatures, affecting the reliability of touch screens.
Innovation Solution
A touch device design featuring a base with strategically positioned and discontinuously arranged shield wires between peripheral wires, including a ground wire, signal protection wire, and touch signal receiving wire, to prevent short-circuit defects by blocking metal particle migration, with specific dimensions and material uniformity to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shield wires are continuously disposed between peripheral wires, then short-circuit prevention is improved, but manufacturing complexity and material cost increase
Solution Approach 1:
The shield wire is divided into multiple discrete segments rather than being continuous. Each segment is positioned at critical locations between peripheral wires where short-circuit risk is highest. This segmentation reduces material usage and manufacturing complexity while maintaining effective protection against metal particle migration.
Solution Approach 2:
Shielding is applied selectively at specific locations between peripheral wires rather than uniformly across the entire structure. The discrete shield wire segments are placed precisely where potential difference exists and short-circuit defects are most likely to occur, optimizing protection while minimizing added complexity.
2Reliability
If shield wires are added to prevent short-circuit defects, then reliability is improved, but manufacturing process complexity increases
Solution Approach 1:
The shield wire segments are integrated into the same manufacturing process as the peripheral wires, using identical material deposition and patterning steps. This merging of processes eliminates the need for separate shield wire fabrication and assembly operations, maintaining manufacturing simplicity while adding protection.
Solution Approach 2:
The shield wire segments serve multiple functions: they act as electrical shields to prevent short-circuits, provide physical barriers against metal particle migration, and can be manufactured using the same processes as existing peripheral wires. This multi-functionality justifies their addition without proportionally increasing manufacturing complexity.
3Quantity of substance
If discrete shield wire segments are used, then material cost is reduced, but shielding effectiveness may be compromised
Solution Approach 1:
The shield wire is segmented into discrete sections positioned at critical interfaces between peripheral wires with different potential differences. This segmentation reduces total material quantity while maintaining shielding effectiveness by concentrating protection where it is most needed, rather than using continuous material throughout.
Solution Approach 2:
The discrete shield wire segments act as intermediary elements between peripheral wires, blocking metal particle migration paths at critical points. These segments serve as sufficient mediators to prevent short-circuits without requiring continuous material coverage, optimizing the balance between material quantity and shielding effectiveness.
Data Source
AI summary
A touch device includes a base; a first peripheral wire, a second peripheral wire, a third peripheral wire, a first shield wire and a second shield wire are disposed on the base; there is a first potential difference between the first peripheral wire and the second peripheral wire, and there is a second potential difference between the second peripheral wire and the third peripheral wire. The second peripheral wire is disposed between and spaced from the first peripheral wire and the third peripheral wire. The first shield wire is discontinuously disposed between the first peripheral wire and the second peripheral wire. The second shield wire is discontinuously disposed between the second peripheral wire and the third peripheral wire.