Head-Mounted Display Wear Detection With Tiered RF Face Tracking
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Solution Overview
Problem
Existing head-mounted display (HMD) devices face challenges in efficiently balancing power consumption and false positive detections when transitioning between standby and active modes, often leading to battery drain and social awkwardness due to inaccurate wear detection.
Innovation Solution
Implementing a multi-tiered power management system using RF face tracking with varying power levels, starting from a low power mode to a high power mode, combined with IMU and eye-tracking systems, to accurately detect when the HMD is worn and authenticated, reducing false positives and negatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RF face tracking system operates at a higher power level continuously, then the detection accuracy and reliability improve, but the battery power consumption increases
Solution Approach 1:
The RF face tracking system dynamically adjusts its power level based on operational context. The system transitions between a first power level (lower consumption) and a second power level (higher consumption) depending on whether the HMD is determined to be worn on the user's head, optimizing the balance between detection reliability and power consumption
Solution Approach 2:
The system changes the operational parameters of the RF face tracking system by adjusting the power level. This parameter change allows the system to achieve high detection accuracy when needed (when worn) while consuming minimal power during standby or non-wear conditions
2Speed
If the device activates all sensors and functions quickly, then the user authentication speed improves, but the false positive detections increase
Solution Approach 1:
The system performs preliminary detection using the RF face tracking system at a lower power level before activating the full sensor suite and eye-tracking system. This preliminary action allows the device to quickly assess whether the HMD is worn, enabling rapid authentication while avoiding false positives by not activating all sensors unnecessarily
Solution Approach 2:
The RF face tracking system serves as an intermediary detection layer between the external environment and the internal sensor systems. It provides an initial assessment of wear status that mediates whether more power-intensive sensors should be activated, reducing false positives while maintaining fast authentication
3Duration of action of stationary object
If the device remains in standby mode with minimal power footprint, then the battery life extends, but the detection latency increases
Solution Approach 1:
The system employs periodic action by activating the RF face tracking system at specific intervals or triggers (such as motion detection or proximity events) rather than continuously. This allows the device to maintain a minimal power footprint during extended standby periods while still providing timely detection when the HMD is picked up or worn
Solution Approach 2:
The system performs preliminary detection using the RF face tracking system that can quickly transition from standby to active detection mode. This preliminary capability reduces detection latency when activation is needed while maintaining low power consumption during standby
Data Source
Figure 1A~1B
Figure 2
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AI summary
A method for operating a head-mounted display device is presented. An RF face tracking system is operated at a first, lower power level. Based at least on an output of the RF face tracking system while operating at the first, lower power level, a first likelihood is determined that the head-mounted display device is positioned on a head of a user. If the first likelihood is greater than a first confidence threshold, the RF face tracking system is operated at a second, higher power level. A second likelihood that the head-mounted display device is positioned on the head of the user is determined based at least on an output of the RF face tracking system while operating at the second, higher power level. If the second likelihood is greater than a second confidence threshold, an eye-tracking system of the head-mounted display device is activated.