Textile-Integrated Capacitive Sensor for Motion-Artifact Reduction
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Solution Overview
Problem
Conventional wearable input devices integrated with textiles suffer from motion artifacts, bulkiness, and compromised physical properties due to full-area composite encapsulation, which affect sensor accuracy and user experience.
Innovation Solution
A capacitive sensor architecture with a dielectric knitted core sandwiched between conductive electrode layers, featuring isolated polymer patches that locally stiffen sensing areas, mitigating motion artifacts while maintaining textile integrity and providing tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full-area composite encapsulation is used to mitigate motion artifacts, then sensor accuracy is improved, but textile physical properties (softness, breathability, conformability) are compromised
Solution Approach 1:
The patent divides the encapsulation into isolated polymer patches positioned only at sensing areas rather than full-area coverage. This segmentation approach localizes the motion artifact mitigation function to where it is most needed (at electrode regions) while preserving the textile's physical properties in non-sensing areas. The polymer patches are strategically placed to encapsulate only the sensing portions, allowing the rest of the textile to maintain its inherent softness, breathability, and conformability.
Solution Approach 2:
The patent applies different properties to different regions of the textile. Polymer encapsulation is applied locally at sensing areas where motion artifact mitigation is required, while non-sensing areas retain the original textile properties. This local quality approach ensures that the stiffening effect is concentrated only where needed for sensor accuracy, without compromising the overall textile's physical characteristics and wearability.
2Adaptability or versatility
If conventional sensor integration methods (patch attachment or knitted integration) are used, then textile integration is achieved, but device bulkiness increases or manufacturing complexity increases
Solution Approach 1:
The patent merges the textile structure with the sensor architecture by treating the textile itself as the dielectric core rather than a separate substrate. The conductive electrodes are directly integrated into the textile layers, and polymer patches are incorporated during the textile fabrication process. This merging eliminates the need for separate sensor patches or complex knitted integration processes, achieving textile integration without significant bulkiness or fabrication complexity.
3Measurement precision
If polymer patches are used to stiffen sensing areas, then motion artifacts are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses the textile structure itself as an intermediary that guides the positioning of polymer patches. The textile's existing pattern and structure serve as a template for placing polymer patches at appropriate sensing areas, eliminating the need for high-precision independent positioning systems. The textile acts as a mediator that translates its own structural features into precise patch placement guidelines, simplifying manufacturing while ensuring accurate motion artifact mitigation.
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 enhances sensor accuracy and user experience by reducing motion artifacts and preserving textile properties, enabling high-density pixel arrays for precise tactile interactions.
Implementation Method 1
the polymer patches can mitigate motion artifacts by locally strain-locking the sensing portions of the textile
Implementation Method 2
capacitive sensors feature low power consumption, high sensitivity, better temperature performance, and low cost
Data Source
AI summary
A capacitive sensor for use in a wearable or flexible input device is described. The capacitive sensor includes a dielectric knitted core comprising deformable polymer patches deposited on a top surface of the dielectric knitted core, conductive electrode layers with stretchable electrodes positioned on the top and bottom surfaces of the dielectric knitted core, and a conductive textile shielding layer on each of the conductive electrode layers. The deformable polymer patches stiffen regions of the dielectric knitted core corresponding to the stretchable electrodes to limit strain on the stretchable electrodes as a wearer of the input device moves and deforms the input device during use. Moreover, the conductive electrode layers and conductive textile shielding layers comprise openings around the stretchable electrodes that redistribute strain away from the stretchable electrodes. These features limit motion artifacts while maintaining the flexibility and comfortability of the input device.