Stretchable Connection Wire Structure for Stable Electrical Stretching
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Solution Overview
Problem
Existing stretchable devices face challenges in maintaining stability and preventing damage during stretching due to stress concentration, leading to potential short circuits and reduced electrical stability.
Innovation Solution
A stretchable device with a substrate featuring incision lines and a conductive elastic structure connected to a metal wire, which includes a combination of an elastic polymer and metal, providing enhanced stretchability and maintaining electrical connectivity by distributing stress and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal wire is used for electrical connection in a stretchable device, then electrical conductivity is improved, but stress concentration and potential short circuits occur during stretching
Solution Approach 1:
The connection wire is constructed as a composite structure with a metal core providing electrical conductivity and an elastic polymer coating providing stretchability and stress distribution. This composite design allows the wire to maintain electrical functionality while accommodating deformation without short circuits.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the connection wire by incorporating materials with different elastic moduli and conducting ratios. The elastic polymer coating changes the mechanical parameters to allow stretching, while the metal core maintains electrical parameters for conductivity.
2Stability of the object's composition
If the entire connection wire is made elastic to provide stretchability, then resistance to deformation is improved, but electrical conductivity deteriorates
Solution Approach 1:
The connection wire combines an elastic polymer matrix with dispersed metal particles or conductive fillers. This composite structure provides the elastic properties needed for stretchability while the metal components maintain electrical conductivity pathways throughout the material.
Solution Approach 2:
The elastic polymer is strategically applied as a coating on the metal core, creating local quality differences where the core provides conductivity and the coating provides elasticity. This localized functional distribution optimizes both electrical and mechanical properties.
3Strength
If a rigid substrate is used to maintain structural integrity, then strength is improved, but stretchability and adaptability to deformation are reduced
Solution Approach 1:
The substrate is divided into rigid regions containing active elements and flexible connection regions with incision lines. This segmentation allows different parts of the substrate to have different mechanical properties, maintaining structural integrity where needed while enabling stretchability in connection areas.
Solution Approach 2:
The incision lines create curved or wavy patterns in the substrate that allow it to deform elastically during stretching. These geometric features enable the rigid substrate to adapt to deformation by converting linear stress into bending and curvature.
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 solution improves stretching stability and prevents damage to the connection wire, ensuring stable electrical performance even under deformation, making it suitable for applications like flexible displays and wearable sensors.
Implementation Method 1
the conductive elastic structure may include a combination of an elastic polymer and at least one of a metal, a liquid metal, or a conductive nanostructure
Implementation Method 2
The elastic polymer may be a copolymer including at least one rigid structural unit and at least one soft structural unit
Implementation Method 3
the connection wire includes a metal wire and a conductive elastic structure electrically connected to the metal wire
Data Source
AI summary
A stretchable device includes a stretchable substrate having a plurality of incision lines that are configured to be deformable by an external force applied to the stretchable substrate, a plurality of active elements on the stretchable substrate, and a connection wire configured to electrically connect adjacent active elements of the plurality of active elements, wherein the connection wire includes a metal wire and a conductive elastic structure electrically connected to the metal wire and locally disposed in the connection wire.