Wearable Strap Capacitive Wear Detection
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Solution Overview
Problem
Wearable devices face challenges in securely determining when they are being worn, leading to unnecessary authentication requirements when not in use, and lack efficient methods to balance security with user convenience.
Innovation Solution
Incorporating flexible insulated conductors in the strap ends that form a capacitor when the device is worn and an open circuit when not worn, using a reference signal to determine the strap's status, and implementing context-aware security features to manage authentication based on wear status and usage patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If authentication is required for every access attempt, then security is improved, but user convenience deteriorates due to unnecessary authentication when the device is not being worn
Solution Approach 1:
The patent implements dynamic authentication requirements based on the device's wear status. The system transitions between different security states: when the device is detected as being worn (capacitive coupling present), authentication is waived for convenience; when not worn (capacitive coupling absent), authentication is required for security. This dynamic adaptation resolves the contradiction by making security requirements flexible rather than static.
Solution Approach 2:
The system continuously monitors the capacitive coupling between the strap conductor and the user's body to determine wear status. This feedback mechanism allows the device to automatically adjust its authentication requirements based on real-time detection of whether it is being worn, eliminating unnecessary authentication prompts while maintaining security when the device is removed.
2Reliability
If the device requires authentication gestures, then security is improved, but device complexity increases due to additional security apparatus and processing
Solution Approach 1:
The patent introduces a capacitive coupling detector as an intermediary mechanism that indirectly determines wear status through electrical field detection rather than direct mechanical or optical sensing. This intermediary approach provides security verification through simple capacitive measurements, avoiding the need for complex authentication hardware while maintaining security through the wear-status-based authentication model.
3Ease of operation
If continuous monitoring of wear status is implemented, then user convenience is improved by reducing unnecessary authentication, but energy consumption increases
Solution Approach 1:
The system implements periodic sampling of the capacitive coupling rather than continuous monitoring. The capacitive detector checks for the presence of the user's body at intervals, determining wear status through periodic measurements. This approach maintains user convenience by detecting when authentication should be required while significantly reducing energy consumption compared to continuous monitoring.
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 secure and convenient access to wearable devices by determining wear status through capacitive responses, reducing unnecessary authentication and enhancing security features like requiring authentication during non-wear periods or when the user is sleeping.
Implementation Method 1
the first and second conductors are coupled to respective ends of the strap and are configured to overlap and form a capacitor when the strap is closed
Implementation Method 2
monitor a capacitive response to the reference signal to determine if the strap is open or closed
Data Source
AI summary
Wearable devices and associated security apparatus are disclosed. An example apparatus includes a strap including a first conductor and a second conductor, when the strap is open, the first and second conductors are a first distance apart, when the strap is closed, the first and second conductors are a second distance apart, the first distance is greater than the second distance; and a device access enabler, to: provide a reference signal to the first conductor; and monitor a response to the reference signal to determine if the strap is open or closed.