Multi-Layer Flexible Wearable Circuit Architecture
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Solution Overview
Problem
Wearable electronics have not gained widespread use due to their rigidity, bulkiness, and limited computational or functional capabilities, failing to provide the desired user functionality in a convenient and flexible form.
Innovation Solution
Development of multi-layer, flexible, and stretchable electronic circuits that include input/output devices, connectors, power sources, and interconnects, with meandering traces and dielectric layers, allowing for space savings and enhanced flexibility, which can be attached to wearable substrates like fabric or skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional rigid electronics are used, then computational and functional capabilities are achieved, but the device becomes physically rigid and bulky
Solution Approach 1:
The patent transitions from planar 2D circuit layouts to a 3D multi-layer architecture with conductive traces distributed across multiple stacked layers. This dimensional expansion allows circuits to achieve flexibility and stretchability while maintaining computational capabilities, as the three-dimensional arrangement enables the circuit to conform to curved and flexible substrates without compromising electrical connectivity
Solution Approach 2:
The patent implements a nested multi-layer structure where conductive traces, dielectric layers, and additional conductive layers are stacked and integrated vertically. Each layer is nested within the overall structure, with lower layers providing foundational circuits and upper layers adding additional functionality. This nesting approach enables the circuit to achieve both flexibility and enhanced computational capabilities by combining multiple functional layers in a compact vertical arrangement
2Volume of moving object
If circuit size is reduced for wearability, then flexibility improves, but space for computational components is limited
Solution Approach 1:
The patent utilizes vertical stacking of multiple conductive and dielectric layers to create a three-dimensional circuit architecture. This dimensional transition from 2D to 3D allows the circuit to pack more functional elements into a smaller horizontal footprint, enabling reduced overall circuit volume while maintaining or enhancing computational and functional capabilities through the additional vertical space
Solution Approach 2:
The patent employs nested multi-layer construction where conductive traces, dielectric materials, and additional conductive layers are integrated in a vertical stack. This nesting enables multiple functional circuits to be embedded within each other across different layers, maximizing the use of available space and allowing complex functional capabilities to be achieved within a compact volume suitable for wearable applications
3Ease of operation
If stretchable traces are implemented, then flexibility and comfort improve, but electrical integrity during stretching becomes challenging
Solution Approach 1:
The patent distributes conductive traces across multiple vertical layers rather than relying on single-plane traces. This three-dimensional arrangement provides redundant electrical pathways and allows the circuit to maintain connectivity during stretching, as deformation in one layer can be compensated by adjacent layers, thereby preserving electrical integrity while enabling stretchability and comfort
Solution Approach 2:
The patent implements nested conductive traces within multiple dielectric layers, creating a stacked configuration where conductive elements are protected and supported by surrounding dielectric materials. This nested structure maintains electrical integrity during stretching by providing mechanical support and continuous conductive pathways across layers, ensuring reliable electrical connection even when the circuit is deformed
Data Source
AI summary
Apparatus and methods are provided for flexible and stretchable circuits. In an example, a method can include forming a first flexible conductor on a substrate, the first flexible conductor including a first conductive trace surrounded on three sides by a first dielectric, and forming a second flexible conductor on top of the first flexible conductor, the first flexible conductor located between the second flexible conductor and the substrate, the second flexible conductor including a second conductive trace surrounded by a second dielectric.


