Stress Sensing Assembly Segmented Rigid Flexible Conductive Lines
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Solution Overview
Problem
Current sensing assemblies in flexible electronic devices require significant deformation to generate detectable changes, limiting their sensitivity and responsiveness to small deformations.
Innovation Solution
A stress sensing assembly comprising a stretchable substrate with alternating rigid and flexible conductive segments, where the flexible conductive segments have a lower Young's modulus than the rigid segments, allowing for increased sensitivity by concentrating deformation and resistance changes in the flexible segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a uniform flexible sensing line is used, then the device maintains good flexibility and stretchability, but the sensing sensitivity is insufficient and requires large deformation to generate detectable changes
Solution Approach 1:
The sensing line is divided into multiple rigid segments separated by flexible conductive segments. This segmentation allows the rigid portions to provide stable electrical contact while the flexible portions concentrate the deformation, thereby improving sensing sensitivity without requiring large overall deformation of the device.
Solution Approach 2:
Different segments of the sensing line are assigned different mechanical properties: rigid segments provide structural stability and electrical conductivity, while flexible segments with lower Young's modulus concentrate strain. This local differentiation of material properties enables high sensitivity to small deformations while maintaining overall device flexibility.
2Measurement precision
If rigid material is used throughout the sensing line, then electrical conductivity and structural stability are improved, but the sensing line becomes too stiff to respond to small deformations
Solution Approach 1:
The sensing line is segmented into rigid and flexible portions, allowing the rigid segments to maintain structural integrity and electrical conductivity while the flexible segments enable response to small deformations. This segmentation resolves the contradiction between rigidity and sensitivity.
Solution Approach 2:
The Young's modulus is varied along the sensing line, with rigid segments having high Young's modulus for structural stability and flexible segments having low Young's modulus for deformation response. This parameter variation enables the sensing line to detect small deformations while maintaining adequate structural strength.
3Measurement precision
If the flexible conductive segments are made very flexible to improve sensitivity, then the response to small deformation improves, but the electrical contact stability between segments deteriorates
Solution Approach 1:
The sensing line is segmented into rigid contact segments and flexible sensing segments. The rigid segments provide stable electrical contact points, while the flexible segments between them concentrate deformation and maintain reliable electrical connection through their lower Young's modulus, thereby improving both sensitivity and contact stability.
Solution Approach 2:
The sensing line uses composite construction with rigid segments (higher Young's modulus) and flexible conductive segments (lower Young's modulus). This composite structure combines the electrical stability of rigid materials with the deformation sensitivity of flexible materials, resolving the contradiction between contact stability and deformation detection.
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
The assembly achieves enhanced sensitivity to small tensile deformations, improving the operational performance of flexible electronic devices by amplifying resistance changes, enabling more precise strain detection.
Implementation Method 1
The stress sensing line is disposed over the stretchable substrate and includes: rigid segments and flexible conductive segments... the Young's modulus of one of the flexible conductive segments is smaller than the Young's modulus of one of the rigid segments
Implementation Method 2
The flexible conductive segments are disposed between two adjacent rigid segments... directly contacts the sidewalls of the two adjacent rigid segments... enabling more precise strain detection
Data Source
AI summary
A stress sensing assembly includes: a stretchable substrate and at least one stress sensing line. The stress sensing line is disposed over the stretchable substrate and includes: rigid segments and flexible conductive segments. The rigid segments are separated from each other. Each of the flexible conductive segments is disposed between two adjacent rigid segments of the rigid segments and directly contacts the sidewalls of the two adjacent rigid segments of the rigid segments, and the Young's modulus of one of the flexible conductive segments is smaller than the Young's modulus of one of the rigid segments. A display device including stress sensing assembly is also disclosed herein.