Stretchable Wiring Overlap Structure for Corrosion-Resistant Connections
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Solution Overview
Problem
Conventional stretchable devices face issues such as short circuits, oxidation, and corrosion due to exposure of wirings, and insufficient strength at wiring connection points, particularly when external forces are applied.
Innovation Solution
A stretchable device design featuring a first and second substrate with overlapping wirings covered by a continuous protective layer, enhancing the strength and reliability of the wiring connection points by ensuring the protective layer covers the entire overlapping region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is provided only on exposed portions of the first wiring, then the wiring is protected from short circuits and corrosion, but the strength of the wiring connection portion is insufficient when external force is applied
Solution Approach 1:
The patent merges the protective function and structural strengthening function into a single continuous protective layer that covers both the exposed wiring portions and the overlapping connection region. This unified structure simultaneously provides corrosion protection and mechanical strength reinforcement at the wiring connection portion.
Solution Approach 2:
The protective layer extends into the overlapping region between the first and second substrates, utilizing the thickness dimension to provide reinforcement at the connection interface. This dimensional extension allows the protective layer to serve as both a protective barrier and a structural strengthening element.
2Ease of manufacture
If the protective layer covers only the exposed wiring, then manufacturing is simpler, but peeling occurs between the first wiring and second wiring when external force is applied
Solution Approach 1:
The protective layer is formed to extend into the overlapping region in advance, creating a preliminary bonding interface that prevents peeling when external forces are applied. This preliminary structural preparation ensures that the connection portion is reinforced before any peeling can occur.
Solution Approach 2:
The protective layer provides enhanced coverage specifically at the overlapping region where peeling is most likely to occur, while maintaining standard coverage elsewhere. This localized quality enhancement targets the critical connection interface without unnecessarily complicating the overall manufacturing process.
Data Source
AI summary
A stretchable device that includes: a first substrate having stretchability; a first wiring on a first main surface of the first substrate; a second substrate facing the first substrate in a thickness direction of the first substrate and connected to the first substrate; a second wiring on a first main surface of the second substrate and facing the first wiring in the first direction; and a first protective layer on the first main surface of the first substrate and a second main surface of the second substrate so as to cover at least a part of the first wiring and at least a part of the second substrate, wherein the first wiring and the second wiring are electrically connected in an overlapping region when viewed from the first direction, and the first protective layer overlaps an entirety of the overlapping region when viewed from the first direction.