Stretchable Device Substrate Design for Stable Wiring Resistance
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Solution Overview
Problem
In stretchable devices, the stretchable substrate contributes significantly to the stretching behavior, leading to high wiring resistance due to the substrate's easy plastic deformation, causing the stretchable wiring to extend gradually.
Innovation Solution
The stretchable device is designed with a stretchable substrate having a loss elastic modulus lower than the stretchable wiring, ensuring the substrate is less likely to plastically deform, thereby restraining the wiring from extending and maintaining low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stretchable substrate has a large proportion in the device, then the device achieves good stretchability, but the substrate plastically deforms easily causing the wiring to extend and resistance to increase
Solution Approach 1:
The patent changes the mechanical parameter of the stretchable substrate by controlling its loss elastic modulus to be lower than that of the stretchable wiring. This parameter adjustment allows the substrate to be more compliant during stretching while the wiring maintains its structural integrity, preventing plastic deformation and resistance increase.
Solution Approach 2:
The patent employs composite material design where the stretchable substrate and stretchable wiring are composed of different materials with specifically tailored mechanical properties. The substrate uses materials with lower loss elastic modulus (such as certain elastomers) while the wiring uses materials with higher loss elastic modulus, creating a composite structure that balances stretchability and electrical stability.
2Ease of operation
If the stretchable substrate is easily plastically deforming, then the device is more flexible during stretching, but the stretchable wiring gradually extends causing high wiring resistance
Solution Approach 1:
The patent adjusts the loss elastic modulus parameter of the stretchable substrate to be lower than that of the stretchable wiring. This creates a differential mechanical response during stretching where the substrate deforms more easily providing flexibility, while the wiring with higher loss elastic modulus resists plastic deformation and maintains electrical conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a stretchable device with minimal increase in wiring resistance even after repeated stretching, maintaining functionality and flexibility.
Implementation Method 1
a loss elastic modulus E'' (S) of the stretchable substrate is smaller than a loss elastic modulus E'' (W) of the stretchable wiring
Data Source
AI summary
A stretchable device that includes: a stretchable substrate; and a stretchable wiring on the stretchable substrate, in which a loss elastic modulus E″ (S) of the stretchable substrate is smaller than a loss elastic modulus E″ (W) of the stretchable wiring.