Flexible Substrate Curved Wiring Stress Distribution
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Solution Overview
Problem
Conventional flexible substrates lack sufficient elasticity to adapt to complex shapes and movements, and they experience stress concentration during extension and contraction, leading to potential breakage.
Innovation Solution
A flexible substrate design featuring a central section with curved wiring sections that extend along its outer periphery, allowing for curvature changes during extension and contraction, thereby dispersing stress and increasing elasticity, with the curved sections having an area of 50% or more of the entire wiring section to prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is designed with conventional wiring structures, then it can provide basic flexibility, but it lacks sufficient elasticity and experiences stress concentration during extension and contraction
Solution Approach 1:
The patent applies curvature to the wiring sections by designing them with arc-shaped paths instead of straight lines. The wiring sections include first, second, and third arc-shaped portions that allow the substrate to extend and contract elastically. This curvature distributes stress along the arc paths during deformation, preventing stress concentration and breakage while enhancing the substrate's elasticity and adaptability to complex shapes
Solution Approach 2:
The patent implements a dynamic wiring structure where the wiring sections can change their curvature and configuration during extension and contraction. The first, second, and third wiring sections are designed to dynamically adjust their shapes based on the substrate's deformation state, allowing the substrate to adapt to various degrees of extension while maintaining electrical connectivity and distributing mechanical stress
2Shape
If the curved wiring sections have small area, then the substrate remains compact, but stress concentration occurs during extension and contraction
Solution Approach 1:
The patent segments the wiring structure into multiple distinct sections (first wiring section, second wiring section, third wiring section) with different functional characteristics. Each section is designed with specific curvature radii and path configurations that optimize both compactness and stress distribution. This segmentation allows the overall structure to remain compact while each segment independently handles stress during extension and contraction
3Adaptability or versatility
If the substrate is designed for high flexibility, then it can adapt to movements, but it lacks sufficient elasticity for complex shapes and movements
Solution Approach 1:
The patent applies local quality by designing different wiring sections with different curvature characteristics and structural properties. The first wiring section has a larger curvature radius for areas requiring gentle bending, while the second and third sections have smaller curvature radii for areas requiring tighter turns. This localized optimization allows the substrate to adapt to complex shapes and movements while maintaining structural stability through strategically placed support elements
Data Source
AI summary
A flexible substrate includes a plurality of unit wiring structures and an insulation sheet on which the plurality of unit wiring structures are disposed. Each of the plurality of unit wiring structures includes a central section and a plurality of strips disposed at an outer side of the central section. Each of the plurality of strips has a first end and a second end, and is curved along an outer periphery of at least part of the central section, the first end connected to the central section. The plurality of strips in each of the plurality of unit wiring structures curve in a clockwise or a counterclockwise manner with the central section as a center of rotation. The plurality of unit wiring structures include at least four unit wiring structures arranged in a two-dimensional manner.