Textile Capacitive Touch Interface Without Rigid Wearable Controls
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Solution Overview
Problem
Existing tactile control interfaces integrated into wearable devices are often rigid and poorly ergonomically designed, hindering user interaction and comfort.
Innovation Solution
A flexible tactile control arrangement composed of alternated stratification of conductive elastomeric films and non-conductive textile layers, forming a sensor matrix with sensor electrodes and conductive tracks, allowing for intuitive gestural commands on textile or deformable supports without stiffening the underlying material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If tactile control interfaces are integrated into wearable devices with rigid supports, then structural stability is improved, but ergonomic comfort and ease of operation deteriorate
Solution Approach 1:
The patent applies this principle by replacing rigid support structures with flexible textile substrates that can conform to the user's body contours. The tactile sensor array is integrated directly into the flexible textile, allowing the control interface to adapt to various wearing positions and body shapes, thereby improving ergonomic comfort while maintaining structural integrity through the flexible material properties
Solution Approach 2:
The patent implements dynamics by using flexible, deformable materials that can dynamically adapt to different body positions and movements. The textile-based support structure allows the tactile interface to flex and move with the user's body, maintaining both structural stability during movement and ergonomic comfort through continuous adaptation to changing conditions
2Ease of operation
If external buttons or reliefs are added to provide tactile control, then ease of operation is improved, but device complexity and integration difficulty increase
Solution Approach 1:
The patent applies merging by integrating the tactile sensor array directly into the textile fabric itself, combining the control interface functionality with the wearable substrate. This eliminates the need for separate external buttons or reliefs, as the textile regions with sensor arrays serve dual purposes as both structural elements and control interfaces, thereby reducing device complexity while maintaining tactile control capability
Solution Approach 2:
The patent implements universality by designing the textile regions with sensor arrays to serve multiple functions: they provide structural support, enable tactile sensing, and offer control interface functionality. This multi-functional design eliminates the need for dedicated external control elements, reducing overall device complexity while maintaining ease of operation through intuitive tactile interaction
3Ease of operation
If flexible materials are used for tactile control, then ergonomic comfort is improved, but manufacturing precision and sensor reliability may deteriorate
Solution Approach 1:
The patent applies this principle by using flexible textile substrates with embedded sensor arrays that maintain precise sensor positioning through the structured integration process. The flexible material allows ergonomic comfort while manufacturing precision is achieved through systematic placement of sensor elements during the textile fabrication process, ensuring consistent sensor-to-textile alignment
Solution Approach 2:
The patent implements composite materials by combining flexible textile substrates with sensor array elements in an integrated structure. This composite construction maintains manufacturing precision through the coordinated fabrication of both textile and sensor components, while the flexible textile base provides ergonomic comfort. The composite structure ensures reliable sensor operation despite material flexibility
4Ease of manufacture
If sensor arrays are integrated directly into textile layers, then ease of manufacture is improved, but sensor reliability and signal detection accuracy may worsen
Solution Approach 1:
The patent applies merging by integrating sensor arrays directly into textile layers during the fabrication process, simplifying manufacturing through unified production. Signal detection reliability is maintained through proper shielding and grounding layers that are also integrated into the textile structure, protecting sensors from electromagnetic interference while preserving the ease of manufacture achieved through direct integration
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
Enables a high-efficiency, robust, and ergonomic tactile control system that can be seamlessly integrated into clothing or accessories, providing intuitive and adaptable control over electronic devices through touch and pressure inputs without the need for external buttons or reliefs.
Implementation Method 1
coated with a piezoresistive material, for example in the form of a matrix of separate areas, which allows the connection between the conductive layers through the regions in which the piezoresistive material is not present
Implementation Method 2
a tactile sensor of a capacitive type, made on a substrate of flexible material that allows for different configurations thereof
Data Source
Figure 1~2
Figure 3a
Figure 3b
AI summary
A tactile control arrangement (10) for at least one electronic device (W, P) including a touch control interface (12) based on a capacitive sensor matrix (S) and a electronic processing module (16) associated to the sensor matrix (S) and arranged to receive therefrom a plurality of electrical signals indicative of the touch or the pressure of an external body on at least one sensor (S) of the matrix and consequent commands to be transmitted towards the above-mentioned electronic device (W, P) is described. The sensor matrix (S) comprises a plurality of active sensor electrodes (E) and a corresponding plurality of conductive tracks (T) for the connection of the active electrodes (E) with the processing module (16). The sensor matrix (S) is formed by a plurality of flexible functional layers (32-48) including a first layer (32) of conductive elastomeric material forming the active electrodes (E) and a second layer (42) of conductive elastomeric material forming the conductive tracks (T) on a plane parallel to the layer (32) of active electrodes (E), which first and second layers (32, 42) of conductive elastomeric material are separated by a flexible layer (40) of insulating material comprising a non-conductive fabric bearing a plurality of vias at the active electrodes (E) of the first layer (32) and the corresponding conductive tracks (T) of the second layer (42), wherein the layers (32, 42) of active electrodes (E) and conductive tracks (T) are deformed so as to directly contact through the vias of the non-conductive textile layer (40).