Stretchable ACF Bonding for Wearable Circuit Durability
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Solution Overview
Problem
Existing wearable devices face challenges in durability and conductivity due to mismatch in the modulus of elasticity between hard and soft layers, leading to delamination and cracking during repeated deformation.
Innovation Solution
The integration of a stretchable anisotropic conductive film (ACF) with a circuit electrode formed on a fabric, allowing for a bond to a chipset, which enhances durability and conductivity while enabling printing on flexible fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer is formed on a film-type stretchable elastomer substrate using metal ink printing, then conductivity is achieved, but delamination and cracking occur during repeated deformation due to modulus mismatch between hard layers and soft layers
Solution Approach 1:
The patent changes the physical and chemical parameters of the conductive layer by using conductive polymer particles embedded in an elastomeric matrix, transforming it from a rigid metal ink layer to a soft, stretchable conductive material that can deform with the substrate without delamination or cracking
Solution Approach 2:
The patent creates a composite material system consisting of conductive polymer particles dispersed in an elastomeric polymer matrix, combining the electrical conductivity of the particles with the flexibility and elasticity of the polymer to achieve both conductivity and stretchability
2Ease of manufacture
If an anisotropic conductive film (ACF) is used for electrical interconnection, then mechanical and electrical connections are guaranteed with a simple manufacturing process, but it has not been previously applied in smart wearable clothing
Solution Approach 1:
The patent modifies the ACF by replacing traditional rigid conductive fillers with conductive polymer particles and using an elastomeric binder, transforming it from a rigid interconnection material to a soft, stretchable film suitable for wearable clothing applications while maintaining the anisotropic conductive properties
Solution Approach 2:
The patent creates anisotropic conductivity where the conductive polymer particles are oriented to provide different conductive properties in different directions, allowing electrical connection in the vertical direction while maintaining flexibility and stretchability in the horizontal plane
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 solution provides smart wearable clothing with excellent stretchability and durability, maintaining conductivity even under deformation, thus overcoming the limitations of existing wearable technologies.
Implementation Method 1
a stretchable circuit electrode formed on the fabric
Implementation Method 2
a stretchable anisotropic conductive film (ACF) formed on the circuit electrode
Data Source
AI summary
The present invention relates to smart wearable clothing including a stretchable circuit electrode and a smart wearable system, and the smart wearable clothing according to an embodiment of the present invention comprises: a fabric; a stretchable circuit electrode formed on the fabric; a stretchable ACF formed on the circuit electrode; and a chipset formed on the stretchable ACF.