Knitted Conductive Thread Junctions for Hidden Electronic Textiles
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Solution Overview
Problem
Existing methods for integrating electronic circuits into textiles face challenges such as conductor breakage, ink permeation, and the need for separate process steps, which can result in visible conductors and complex assembly processes.
Innovation Solution
Knitting conductive threads into patterns that form conductive junctions within the fabric, integrated with surface texture features like pointelles, allowing for the direct bonding of electronic components during the knitting process, thus creating a hidden and protected circuitry with individually addressable components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conductive ink is printed onto fabric substrates, then electronic circuits can be formed, but the conductors are visible on the surface and the process requires separate steps from fabric production
Solution Approach 1:
The patent combines the fabric production process with the circuit formation process by knitting conductive threads directly into the fabric during the knitting operation. This merging eliminates the need for separate printing steps and integrates conductor creation with the base material production, resolving both the visibility issue (conductors are embedded) and the manufacturing efficiency issue (single integrated process).
Solution Approach 2:
The conductive threads are nested within the fabric structure during knitting, with conductors positioned inside the fabric body rather than on the surface. This nesting approach hides the conductors within the fabric layers while maintaining electrical connectivity, solving the visibility problem while preserving circuit functionality.
2Reliability
If conductive threads are printed onto substrates, then circuits can be formed, but the conductors are prone to breakage during handling
Solution Approach 1:
The conductive threads are merged with the fabric structure through the knitting process, creating a unified composite material where the conductor and fabric are inseparable. This integration provides mechanical support from the fabric to the conductor, preventing breakage during handling while maintaining electrical reliability.
Solution Approach 2:
The fabric structure acts as a flexible protective shell surrounding the conductive threads, providing mechanical protection while maintaining flexibility. This protective enclosure prevents conductor breakage during handling and wear, solving the durability problem while preserving the flexible nature of the textile.
3Device complexity
If separate process steps are used for fabric production and circuit formation, then manufacturing flexibility is maintained, but assembly complexity increases
Solution Approach 1:
The patent merges fabric production and circuit formation into a single knitting operation, eliminating multiple assembly steps. The conductive threads are incorporated during the base fabric knitting process, creating the complete electronic textile in one manufacturing pass, thereby reducing assembly complexity while maintaining manufacturing flexibility.
Solution Approach 2:
The knitting machine is designed to perform multiple functions simultaneously: producing the fabric structure and forming the circuit pattern in the same operation. This multi-functionality reduces the number of required process steps and simplifies manufacturing while maintaining the ability to produce different circuit configurations.
4Productivity
If conductive ink is printed onto substrates to form circuits, then electronic functionality is achieved, but the process requires additional separate steps from fabric production
Solution Approach 1:
The patent combines fabric production and circuit formation into a single integrated knitting process, eliminating the need for separate printing and assembly steps. This merger increases manufacturing efficiency by producing the complete electronic textile in one operation while reducing the total number of process steps required.
Solution Approach 2:
The conductive threads are prepared and positioned within the fabric structure during the initial knitting process, before any subsequent circuit formation steps would be needed. This preliminary integration of conductors into the fabric eliminates the need for later printing or assembly operations, improving productivity while simplifying the overall process.
Data Source
AI summary
Examples are disclosed herein that relate to electronically functional textile articles. One example provides a knitted textile article comprising a first conductive thread and a second conductive thread knit into the article in such a manner as to form a conductive junction separated by a gap. The knitted textile article further comprises a knitted surface texture feature formed at a location that defines an opening over the gap, and an electronic component connecting the gap to form a circuit with the first conductive thread and the second conductive thread.