Stretchable Wiring Board Insulating Notch Design
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Solution Overview
Problem
Existing stretchable wiring boards face issues with short-circuiting and breakage of wiring lines when they intersect, particularly during stretching, as the stress at these intersections can lead to damage and deterioration in resistivity.
Innovation Solution
A stretchable wiring board design featuring a stretchable substrate with conductive wiring lines and an insulating layer that includes notches positioned to prevent direct contact and stress concentration at intersections, thereby avoiding short-circuits and reducing the likelihood of breakage and resistivity deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wiring lines are arranged to intersect three-dimensionally on the stretchable substrate, then the wiring density and functionality are improved, but the wiring lines may be short-circuited or broken during stretching
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first wiring line and the second wiring line at their intersection point. This insulating layer prevents direct contact between the conductors, eliminating short-circuit risk while allowing the wiring lines to maintain their three-dimensional overlapping configuration for high density
Solution Approach 2:
The insulating layer is segmented with notches that strategically avoid overlapping the first wiring line while overlapping the second wiring line. This segmentation creates stress-relief zones that prevent wire breakage during stretching, while maintaining electrical isolation where needed
2Reliability
If the insulating layer completely covers the first wiring line to prevent short-circuiting, then electrical isolation is improved, but stress concentration occurs during stretching
Solution Approach 1:
The insulating layer exhibits local quality variation through strategically placed notches. In regions where electrical isolation is critical (overlapping the first wiring line), the insulating layer remains continuous. In regions where stress relief is needed (overlapping the second wiring line), the insulating layer is interrupted by notches, creating localized stress-relief zones
Data Source
AI summary
A stretchable wiring board that includes: a stretchable substrate; a first wiring line on the stretchable substrate; an insulating layer overlapping a first part of the first wiring line in a plan view of the stretchable wiring board; and a second wiring line overlapping the first part of the first wiring line in the plan view with the insulating layer interposed therebetween. The insulating layer has at least one first notch, and in the plan view, the at least one first notch does not overlap the first wiring line and overlaps the second wiring line.