Touch Sensor Wiring Overlap Design for Disconnection Prevention
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Solution Overview
Problem
Existing touch sensors face issues with wiring disconnection and short circuits in overlapping areas during divisional exposure, particularly as the width of wiring is reduced for high resolution, leading to performance deterioration.
Innovation Solution
The touch sensor design includes a first divisional wiring part with a connecting protrusion of wider width and a second divisional wiring part with narrower width, optimized in shape and size to ensure easy overlap and connection, minimizing disconnection and short circuits, and allowing for large-area implementation without the need for expensive large-area masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the width of wiring is reduced to achieve high resolution, then measurement precision is improved, but reliability deteriorates due to wiring disconnection in overlapping areas
Solution Approach 1:
The patent applies local quality by creating a connecting protrusion at the overlapping end of the first divisional wire with a width greater than the normal wiring width. This localized widening at the connection point ensures reliable overlap with the second divisional wire while maintaining narrow wiring width elsewhere for high resolution. The connecting protrusion serves as a localized quality enhancement that solves the reliability issue without compromising overall resolution.
2Adaptability or versatility
If divisional exposure is used to implement large-area touch sensors, then adaptability is improved, but manufacturing precision deteriorates due to wiring disconnection in overlapping areas
Solution Approach 1:
The patent applies preliminary action by pre-forming the connecting protrusion at the overlapping end of the first divisional wire before the second divisional exposure process. This preliminary structural preparation ensures that when the second divisional wire is formed, it will reliably overlap and connect to the protrusion. The connecting protrusion acts as a pre-prepared connection interface that compensates for potential alignment variations in the divisional exposure process, thereby maintaining manufacturing precision across large areas.
3Ease of manufacture
If the overlapping area between divisional exposures is reduced, then manufacturing cost is improved by using smaller masks, but reliability deteriorates due to increased resistance at overlapped wiring
Solution Approach 1:
The patent applies local quality by concentrating the overlap area into a localized connecting protrusion rather than distributing a wide overlap across the entire wiring. The connecting protrusion has a controlled, limited overlap area that maintains good electrical contact (low resistance) while allowing the rest of the wiring to use minimal overlap. This localized approach enables the use of smaller exposure masks for cost-effective manufacturing while ensuring reliable wiring performance at the connection point.
Data Source
AI summary
A touch sensor includes a sensing part in which a plurality of sensing cells is arranged and connected and a wiring part connected to the sensing part and formed outside the sensing part. The wiring part includes a first divisional wiring part having a plurality of first divisional wires having a connecting protrusion with a width larger than that of the wiring at one end thereof and a second divisional wiring part having a plurality of second divisional wires having one end thereof with a width smaller than that of the connecting protrusion and coupled to and overlapped with the connecting protrusion. The first divisional wiring part and the second divisional wiring part are formed by divisional exposure.