Stretchable Array Substrate Wiring Stress Distribution
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Solution Overview
Problem
Stretchable array substrates face issues with breakage of electrical wiring joints due to deformation of hinges, leading to stress concentration and potential joint failure.
Innovation Solution
The design incorporates a resin base member with island-like bodies and meandering hinges, where electrical wiring lines are stacked, featuring a joint on the linear portion and a thin wiring portion on the bend, made of materials like Au, Ag, or Cu, to distribute stress and reduce deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrical wiring lines are stacked directly on hinges, then the substrate achieves flexibility and elasticity, but stress concentrates on the joint boundary causing breakage
Solution Approach 1:
The patent applies local quality by creating a thin wiring portion with reduced width at the bend location of the electrical wiring line. This local structural modification allows the bend area to have different mechanical properties (more flexible, lower stress concentration) compared to the straight portions, thereby preventing joint breakage while maintaining overall flexibility of the substrate
Solution Approach 2:
The electrical wiring line is segmented into different portions with different cross-sectional dimensions. The thin wiring portion is specifically positioned at the bend to handle stress differently from the thicker straight portions, effectively dividing the wiring structure to address the stress concentration problem at critical locations
2Strength
If the joint of electrical wiring is made larger to strengthen it, then joint strength improves, but the wiring occupies more space and reduces flexibility
Solution Approach 1:
Instead of uniformly increasing the joint size throughout the electrical wiring line, the patent applies local quality by creating a thin wiring portion only at the bend location. This localized dimensional change provides the necessary stress relief at the critical bend area while keeping the straight portions sufficiently robust for electrical connection, thus maintaining both strength and flexibility
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 reduces the likelihood of joint breakage by distributing stress and absorbing torsional loads, enhancing the durability and flexibility of the stretchable array substrate.
Implementation Method 1
The thin wiring portion closer to the second end of the linear portion than the joint and having a length in a width direction intersecting a longitudinal direction of the first electrical line smaller than a length in the width direction of the joint when viewed in the stacking direction
Data Source
AI summary
A stretchable array substrate includes: a resin base member and an array layer. The resin base member includes bodies disposed apart from each other and hinges that couple the bodies. The array layer includes electrical wiring lines stacked on the hinges. The hinges each includes a linear portion and a bend that meanders and couples second ends of two of the linear portions. The electrical wiring lines include: a first electrical line stacked on the linear portion; and a second electrical line stacked on the bend. The first electrical line is provided with: a joint stacked on the first end of the linear portion; and a thin wiring portion closer to the second end of the linear portion than the joint and having a length in a width direction intersecting a longitudinal direction of the first electrical line smaller than a length in the width direction of the joint.