Head-Mounted Wear Detection Using Capacitive Facial Contact
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Solution Overview
Problem
Head-mounted devices face inefficiencies in power management, as they often consume power unnecessarily when not in use or when not worn by the user, leading to battery drain and reduced usability.
Innovation Solution
Incorporating sensors with conductive and non-conductive materials that detect when the device is being worn, allowing a controller to switch between low-power and high-power states based on capacitance changes, ensuring efficient power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the head-mounted device operates continuously in high-power state, then content display and user interaction are maintained, but power consumption increases and battery life decreases
Solution Approach 1:
The system dynamically transitions between low-power and high-power states based on real-time detection of wear status. The controller adjusts the power state of the head-mounted device according to whether it is being worn, optimizing the balance between battery life and functional performance.
Solution Approach 2:
The sensor provides feedback about the wear status to the controller, which then adjusts the power state accordingly. This closed-loop feedback mechanism ensures the device operates efficiently by switching to low-power mode when not worn and high-power mode when worn, resolving the contradiction between battery life and power consumption.
2Reliability
If the head-mounted device uses simple contact detection, then manufacturing cost is reduced, but detection reliability and measurement precision deteriorate
Solution Approach 1:
The sensor utilizes capacitance change as a detection parameter to determine wear status. By monitoring the change in capacitance value when the device transitions from unworn to worn state, the system achieves reliable detection without requiring complex mechanical or optical sensor structures.
Solution Approach 2:
The patent replaces complex mechanical contact detection mechanisms with an electrical capacitance-based sensing system. This substitution maintains high detection reliability while reducing mechanical complexity and improving durability of the sensor structure.
3Use of energy by moving object
If the device transitions frequently between power states, then power efficiency is improved, but response time and operational smoothness may be compromised
Solution Approach 1:
The sensor continuously monitors wear status in advance, allowing the controller to proactively transition to the appropriate power state before the user actually needs the device. This preliminary detection and preparation minimizes perceived response time while maintaining power efficiency.
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 system effectively conserves power by automatically transitioning to low-power mode when not in use and high-power mode when worn, enhancing battery life and user experience.
Implementation Method 1
the sensor is configured to generate a signal that indicates a change in a capacitance of the sensor
Implementation Method 2
The first contact pad includes an electrically conductive material embedded in a non-electrically conductive material, and the first contact pad is resiliently flexible and is configured for facial engagement
Data Source
AI summary
A head-mounted device includes a frame and a sensor coupled to the frame. The sensor includes a first conductive plate coupled to the frame and a first contact pad coupled to the frame and electrically coupled to the first conductive plate. The first contact pad includes an electrically conductive material embedded in a non-electrically conductive material, and the first contact pad is resiliently flexible and is configured for facial engagement. The sensor is configured to generate a signal that indicates a change in a capacitance of the sensor, and a controller is configured to change a power state of the head-mounted device based on the signal.