Anisotropic Conductive Thread for Flexible Textile Circuit Connections
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Solution Overview
Problem
Existing technologies face challenges in establishing efficient and cost-effective electrical connections in flexible textile materials due to dimensional instability and incompatibility with traditional PCB soldering methods, which limits the integration of multi-pin connections and increases manufacturing costs.
Innovation Solution
The use of anisotropic conductive thread (ACT) with alternating conductive and insulating segments for mechanical and electrical connections, integrated with automated thread installation processes using embroidery machines, allows for efficient and reliable connections in flexible substrates without the need for cutting or precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If single-point connectors are used to establish electrical connections in textile circuits, then dimensional stability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The conductive thread is segmented into alternating conductive and insulating sections along its length. The conductive sections make electrical contact through the substrate while the insulating sections prevent unwanted lateral conduction, enabling multi-pin connections without precise alignment
Solution Approach 2:
The anisotropic conductive thread serves multiple functions simultaneously: it provides mechanical stitching to join textile layers, establishes electrical connections through its conductive sections, and prevents short circuits through its insulating sections. This multi-functionality eliminates the need for separate alignment and connection processes
2Reliability
If traditional PCB soldering methods are used, then electrical connection reliability is improved, but compatibility with textile substrates deteriorates
Solution Approach 1:
The patent replaces the thermal soldering process with a mechanical stitching process using the anisotropic conductive thread. The thread is stitched through the textile substrate using conventional sewing or embroidery techniques, establishing electrical connections through mechanical contact rather than thermal bonding, thereby avoiding damage to temperature-sensitive textile materials
Solution Approach 2:
The conductive properties of the thread are changed along its length by creating alternating conductive and insulating sections. This parameter variation allows the single thread to establish multiple discrete electrical connections while preventing short circuits, adapting the connection behavior to match the requirements of multi-pin interfaces
3Productivity
If z-axis conductive tape is used for electrical connections, then manufacturing efficiency is improved, but applicability to flexible substrates deteriorates
Solution Approach 1:
The patent uses a flexible anisotropic conductive thread instead of rigid z-axis conductive tape. The thread can be stitched through flexible textile substrates and conform to curved or irregular surfaces, maintaining the manufacturing efficiency of automated thread installation while adapting to the flexibility requirements of wearable electronics
Solution Approach 2:
The anisotropic conductive thread acts as an intermediary that bridges the gap between rigid PCB connection methods and flexible textile substrates. It provides a connection mechanism that works with automated installation equipment while being compatible with flexible, porous textile materials
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
ACT enables cost-effective and efficient electrical connections in flexible textiles, maintaining mechanical strength and reducing production costs by eliminating the need for cutting and simplifying the manufacturing process, while allowing for the integration of sensors and microprocessors with wearable devices.
Implementation Method 1
anisotropic conductive material (e.g., ACT) having alternating conductive (i.e., electrically conductive) segments and insulating (i.e., electrically insulating) segments
Data Source
AI summary
An embroidery machine with on-board electronics executing layout and alignment software provides for automated thread installation to establish textile-to-pad contact through the use of anisotropic conductive threads characterized by electrically conductive segments alternating with electrically insulating segments. Present embodiments provide for garments or other fabrics and textiles having flexible circuits integrated on a flexible substrate that bends and moves with the garment in a way not seen with stiff printed circuit boards, which may include multiple textile circuits attached to fabric to impart desired electronic features including connectivity to a printed circuit board external to a garment formed according to the present embodiments, as well as imparting electrical conductivity across seams of a garment sewn together from fabric, while maintaining electrical integrity of neighboring circuits on the same garment.