Stretchable Device Wiring Protection Against Substrate Breakage
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Solution Overview
Problem
Conventional methods for connecting stretchable wiring to substrates often result in breakage due to direct contact or hindered expansion and contraction, leading to potential breakage points.
Innovation Solution
A stretchable device design featuring a first substrate with a stretchable wiring, a second substrate with a higher Young's modulus, a connection member, and a protective layer between the second substrate and the wiring to reduce contact and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal pressure bonding is used to connect electrode terminals, then electrical connection between substrates is achieved, but the stretchable wiring may be broken due to direct contact with the second substrate
Solution Approach 1:
A protective layer is introduced as an intermediary element between the second substrate and the stretchable first wiring. This protective layer prevents direct contact between the rigid second substrate and the flexible first wiring, eliminating the source of mechanical stress that causes wiring breakage while maintaining effective electrical connection through the connection member.
2Reliability
If the second substrate contacts the stretchable wiring, then substrate connection is achieved, but expansion and contraction of the stretchable wiring is hindered
Solution Approach 1:
The protective layer serves as a mediator that decouples the mechanical constraints of the second substrate from the stretchable first wiring. This allows the first wiring to expand and contract freely during stretching operations without being hindered by direct contact with the rigid second substrate, while still maintaining electrical connection functionality.
3Ease of manufacture
If direct contact between second substrate and first wiring is maintained, then manufacturing simplicity is preserved, but the first wiring becomes a starting point of breakage
Solution Approach 1:
The protective layer is integrated into the existing manufacturing process as an additional layer that does not significantly complicate the manufacturing steps. It can be applied using conventional techniques and integrates seamlessly with the pressure bonding process, while effectively preventing wiring breakage by eliminating direct contact between the second substrate and first wiring.
Data Source
AI summary
A stretchable device that includes: a first substrate; a stretchable first wiring on the first substrate; a second substrate facing the first substrate in a first direction that is a thickness direction of the first substrate; a second wiring on the second substrate and facing the first wiring in the first direction; a connection member electrically connecting the first wiring and the second wiring; and a first protective layer at least between the second substrate and the first wiring in the first direction.