Electrodermal Activity Sensing Surface With Isolated Electrode Pairs
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Solution Overview
Problem
Existing electrodermal activity (EDA) measurement techniques face challenges in accurately capturing EDA without generating noise, often requiring electrodes to be glued or pressed against the skin, causing discomfort and invasive feelings due to friction issues when the user moves.
Innovation Solution
A system with a sensing surface featuring electrically isolated electrode pairs, where the distance between neighboring pairs is greater than between electrodes within each pair, allowing for non-invasive contact and noise-cancellation algorithms to achieve high signal-to-noise ratios, integrated into vehicle structures like steering wheels or touchscreens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are glued or pressed against the skin to accurately capture EDA, then measurement precision is improved, but user comfort deteriorates due to friction and invasive feelings when the user moves
Solution Approach 1:
The patent extracts the electrodes from direct skin contact and integrates them into a touch screen surface. The electrodes are embedded within the touch screen structure, allowing EDA measurement without requiring separate skin-attached electrodes. This extraction resolves the contradiction by maintaining measurement capability while eliminating the discomfort of glued or pressed electrodes.
Solution Approach 2:
The patent merges the EDA measurement function with the existing touch screen interface. The electrodes are integrated into the touch screen structure, combining two functions (touch input and EDA measurement) into a single device. This merging allows users to interact with the device normally while EDA is measured passively, improving comfort without sacrificing measurement precision.
2Reliability
If multiple electrode pairs are used to improve EDA measurement reliability, then measurement precision is improved, but device complexity increases due to additional sensors and processing requirements
Solution Approach 1:
The touch screen serves multiple functions: it acts as both the user interface for touch input and as the substrate for EDA measurement electrodes. The same touch screen structure that users interact with daily is also used for physiological measurement, eliminating the need for separate dedicated EDA sensor arrays and reducing overall device complexity.
Solution Approach 2:
The patent changes the spatial arrangement parameter of the electrodes by embedding them within the touch screen structure rather than placing them externally. This parameter change allows multiple electrode pairs to be configured in a compact, organized manner that improves measurement reliability while maintaining manageable device complexity through systematic integration.
3Measurement precision
If electrodes are in direct contact with skin to reduce noise, then signal-to-noise ratio is improved, but user comfort deteriorates due to continuous skin contact requirements
Solution Approach 1:
The touch screen surface acts as an intermediary between the electrodes and the user's skin. Instead of electrodes directly contacting the skin, the touch screen surface mediates the interaction, allowing electrical contact for EDA measurement while maintaining a barrier that reduces friction and discomfort. This intermediary resolves the contradiction by enabling signal acquisition without the negative effects of direct skin contact.
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 accurate and non-invasive EDA measurement without continuous skin contact, reducing discomfort and noise, while maintaining high signal quality and identifying user emotional states effectively.
Implementation Method 1
one or more sensors configured to detect contact with the sensing surface
Data Source
AI summary
The measurement of electrodermal activity (EDA) can be facilitated by a sensing surface. The sensing surface can have a plurality of electrode pairs. An electrode pair can include a first electrode and a second electrode that are electrically isolated from each other. The plurality of electrode pairs can be electrically isolated from each other. A distance between neighboring electrode pairs can be larger than a distance between the first electrode and a second electrode of each electrode pair. One or more sensors can be configured to detect contact with the sensing surface. In response to the one or more sensors detecting contact with the sensing surface, one or more electrode pairs can be selected to be activated. In response to the one or more electrode pairs being selected to be activated, the selected one or more electrode pairs can be activated.