Head-Mounted Display Power Saving via Position Detection
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Solution Overview
Problem
Existing virtual and augmented reality systems face challenges in efficiently managing power consumption and maintaining user comfort by accurately detecting device position and orientation, leading to unnecessary energy usage when not in use.
Innovation Solution
A head-mounted display system equipped with sensors and processing electronics to detect the device's position and orientation, reducing power consumption by dimming or turning off components when the device is upside-down, stationary, or not in use, while maintaining a transparent view of the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the head-mounted display system continuously operates all components to maintain readiness, then the system responsiveness and user experience are improved, but power consumption increases and battery life decreases
Solution Approach 1:
The system dynamically adjusts component operation states based on detected device position and usage conditions. Components transition between active, standby, and powered-off states according to real-time sensor data, optimizing the balance between responsiveness and power consumption.
Solution Approach 2:
The system uses sensor feedback (accelerometers, gyroscopes, proximity sensors) to continuously monitor device position and usage state, then adjusts component power states accordingly. This closed-loop control enables the system to respond to user needs while minimizing unnecessary power consumption.
2Use of energy by moving object
If the system reduces power by turning off components when not in use, then power consumption is reduced, but system responsiveness and readiness may be compromised
Solution Approach 1:
The system performs preliminary actions by maintaining certain components in a standby state rather than fully powered off, allowing for rapid activation when needed. Critical components remain in a low-power ready state to ensure immediate responsiveness while still reducing overall power consumption.
Solution Approach 2:
The system implements periodic monitoring and state transitions, checking sensor conditions at regular intervals to determine when components should be activated. This periodic action ensures the system remains responsive to user needs while minimizing the time components spend in high-power states.
3Measurement precision
If sensors continuously monitor device position and orientation, then accurate detection is improved, but power consumption increases
Solution Approach 1:
The system applies partial monitoring by activating full sensor suites only when needed based on initial detection thresholds. Sensors operate at reduced precision or lower sampling rates during stable conditions, then switch to high-precision continuous monitoring when motion or position changes are detected.
Data Source
AI summary
Head-mounted display systems with power saving functionality are disclosed. The systems can include a frame configured to be supported on the head of the user. The systems can also include a head-mounted display disposed on the frame, one or more sensors, and processing electronics in communication with the display and the one or more sensors. In some implementations, the processing electronics can be configured to cause the system to reduce power of one or more components in response to at least in part on a determination that the frame is in a certain position (e.g., upside-down or on top of the head of the user). In some implementations, the processing electronics can be configured to cause the system to reduce power of one or more components in response to at least in part on a determination that the frame has been stationary for at least a threshold period of time.