Stretchable Circuit Board Multi-Layer Wiring Integrity
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Solution Overview
Problem
Existing stretchable circuit boards lack a multi-layer structure, which complicates the integration of body electrodes and draw-out wirings on the same surface, and they are prone to wire breakage during stretching, affecting sensing accuracy in wearable devices.
Innovation Solution
A stretchable circuit board with multiple layers, where stretchable bases and interlayer stretchable bases are layered, and stretchable wiring portions on opposing surfaces are electrically continuous through connecting portions, preventing wire breakage during stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-layer structure is employed to increase substrate area for multiple channels, then sensing accuracy and signal detection capability are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent transitions from a single-layer planar structure to a multi-layer three-dimensional structure. Multiple stretchable bases are stacked and connected through connecting portions to form a multi-layer configuration, effectively utilizing the vertical dimension to increase the available substrate area for multiple sensing channels without significantly increasing the planar footprint.
Solution Approach 2:
The patent implements a nested structure where multiple stretchable bases are stacked and interconnected. The connecting portions penetrate through intermediate bases to establish electrical connections between different layers, creating a compact nested arrangement that maximizes space utilization while maintaining structural integrity.
2Productivity
If stretchable wiring portions are connected across multiple layers, then wiring density and functionality are improved, but reliability and resistance to wire breakage during stretching deteriorate
Solution Approach 1:
The patent employs stretchable bases and connecting portions made from flexible, elastomeric materials that can undergo repeated stretching and relaxation cycles without cracking or breaking. These flexible components maintain electrical continuity even during deformation, ensuring reliable signal transmission across multiple layers.
Solution Approach 2:
The patent utilizes composite structures combining stretchable bases with conductive materials in the connecting portions. This composite approach ensures both mechanical flexibility for stretching and electrical conductivity for signal transmission, achieving high wiring density while maintaining reliability during dynamic deformation.
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 multi-layer structure enhances sensing accuracy by allowing precise detection of human body signals even with misalignment and maintains wiring integrity during stretching, enabling high-density and complex wiring configurations.
Implementation Method 1
stretchable bases and interlayer stretchable bases are layered
Implementation Method 2
heating or applying pressure to the plural stretchable bases to cause the stretchable wiring portions to be electrically continuous with each other
Implementation Method 3
heating or applying pressure to the plural stretchable bases to cause the stretchable wiring portions to be electrically continuous with each other
Data Source
AI summary
A stretchable circuit board includes plural stretchable bases, and plural stretchable wiring portions, at least one of which is provided on each of main surfaces, facing each other, of the plural stretchable bases, in which the stretchable wiring portions provided on the main surfaces are electrically continuous with each other through a connecting portion.