Stretchable Device Wiring Stress Dispersion
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Solution Overview
Problem
Conventional stretchable devices exhibit low mechanical strength due to stress concentration at the interface between connection members like solder and wiring, leading to potential disconnection and interfacial delamination.
Innovation Solution
A stretchable device design featuring a stretchable substrate with a first and second stretchable wiring, where the first end portion of the first stretchable wiring is connected to an electronic component, and the second end portion is connected to the third end portion of the second stretchable wiring, thereby dispersing stress and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solder is provided on the second conductor and arranged to overlap the overlapping region of the first conductor and second conductor, then electrical connection is achieved, but mechanical strength is low due to stress concentration at the interface
Solution Approach 1:
The patent segments the connection structure by introducing a protrusion on the first conductor and a corresponding recess on the second conductor. This segmentation creates a mechanical interlocking feature that distributes stress away from the solder interface, resolving the contradiction between achieving reliable electrical connection and maintaining mechanical strength.
Solution Approach 2:
The protrusion and recess structure acts as an intermediary mechanical feature between the first and second conductors. This intermediary structure provides mechanical support and stress distribution, preventing direct stress concentration at the solder interface while maintaining electrical connectivity.
2Adaptability or versatility
If a stretchable substrate is used to provide stretchability, then adaptability is improved, but stress concentration occurs at the wiring interface leading to disconnection
Solution Approach 1:
The protrusion and recess segmentation creates discrete mechanical support points that allow the stretchable substrate to deform while maintaining structural integrity at the connection interface. This enables stretchability without compromising connection reliability.
Solution Approach 2:
The mechanical interlocking structure of protrusion and recess provides beforehand cushioning by creating a stress-distributing framework that prevents stress concentration before it can cause disconnection or delamination during stretching.
3Device complexity
If the electronic component end portion overlaps the overlapping region of conductors, then compact design is achieved, but stress concentration occurs leading to interfacial delamination
Solution Approach 1:
The protrusion and recess structure serves as an intermediary mechanical support that allows the electronic component to be positioned in the overlapping region for compact design while preventing stress concentration at the interface through its stress-distributing geometry.
Data Source
AI summary
A stretchable device that includes: a stretchable substrate having a main surface; an electronic component on the main surface of the stretchable substrate; a first stretchable wiring connected to the electronic component; and a second stretchable wiring connected to the first stretchable wiring. A first end portion in an extending direction of the first stretchable wiring is connected to the electronic component, and a second end portion in the extending direction of the first stretchable wiring is connected to a third end portion in the extending direction of the second stretchable wiring.