Electric Field Sensor Matrix for Robust Touch-Free Interfaces
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Solution Overview
Problem
Existing user interface technologies, such as keyboards and touchscreens, are fragile, expensive, and poorly suited for outdoor or harsh environments, with limited scalability and poor applicability for touch-free interactions.
Innovation Solution
A sensor product comprising an array or matrix of electrically conductive areas on a flexible substrate, with a resistive sheet and peripheral electrodes, allowing for scalable and cost-effective touch-free interaction capable of being integrated into various surfaces and shapes, using a manufacturing process that includes etching, printing, and lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional user interface devices (keyboards, touchscreens) are used, then they provide functional user interaction, but they are fragile, expensive, and have limited scalability
Solution Approach 1:
The patent replaces traditional mechanical user interface components (keyboards, touchscreens) with an electric field sensing system that detects user interaction through capacitance changes. This substitution eliminates fragile mechanical parts while maintaining interaction functionality, achieving both robustness and scalability.
Solution Approach 2:
The patent changes the fundamental parameter of interaction detection from mechanical contact to electric field capacitance changes. By measuring changes in capacitance caused by user proximity or contact, the system achieves touch-free or touch-able interaction without requiring fragile physical components, thereby improving reliability and reducing fragility.
2Adaptability or versatility
If traditional user interface devices are used, then they provide user interaction capability, but they are expensive and have limited scalability for large areas
Solution Approach 1:
The patent segments the sensing surface into multiple independent sensor elements arranged in an array. Each sensor element can be independently controlled and read, allowing the system to scale to large areas by simply adding more elements to the array. This segmentation enables cost-effective manufacturing while maintaining scalability for various application sizes.
Solution Approach 2:
The patent creates a universal sensing surface that can function as a keyboard, touch display, or other interactive surfaces depending on the application. The same basic structure of conductive sensor elements on a substrate can be used for diverse applications, eliminating the need for separate expensive components for each function and enabling cost-effective scalability.
3Adaptability or versatility
If traditional user interface devices are used, then they provide interaction functionality, but they are poorly applicable for outdoor or harsh environments
Solution Approach 1:
The patent replaces mechanical interaction surfaces with an electric field-based sensing system that is inherently resistant to environmental factors. The sensor elements detect user interaction through capacitance changes without requiring physical contact, making the system suitable for outdoor and harsh environments where traditional mechanical interfaces would fail.
Solution Approach 2:
The patent uses a flexible substrate to mount the sensor elements, allowing the interface to be conformable and resistant to environmental damage. The thin-film structure protects the electronic components while maintaining flexibility and environmental robustness, enabling deployment in harsh conditions where rigid traditional interfaces would be vulnerable.
4Measurement precision
If the number of electrically conductive areas is increased to improve resolution, then sensing accuracy improves, but the area occupied and manufacturing complexity increase
Solution Approach 1:
The patent applies local quality by varying the size, shape, and spacing of individual sensor elements based on the specific sensing requirements of different regions. High-resolution areas use smaller, more densely spaced elements, while lower-resolution areas use larger, more spaced elements. This allows optimization of resolution where needed without unnecessarily increasing the overall sensor area or manufacturing complexity.
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 robust, scalable, and cost-effective touch-free interfaces suitable for diverse applications, including user-computer interactions, body sensing, and environmental monitoring, with enhanced flexibility and durability.
Implementation Method 1
When an object interferes with the electric field, the capacitance of the environment is altered and the received current values are changed.
Implementation Method 2
Electric field sensing refers to a method for determining positions, movements and geometries of objects on the basis of disturbances which they cause to a surrounding electric field.
Implementation Method 3
A low frequency electric field is generated in order to induce a current and the induced current is measured at receiving nodes.
Data Source
AI summary
A sensor product for electric field sensing. The sensor includes a substrate, at least one electrically conductive area on the surface of the substrate, an output, and at least one conductor between the at least one electrically conductive area and the output. Also a sensor product web.