HMD Sensor Control for Power Reduction
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Solution Overview
Problem
The continuous detection of location and orientation by head-mounted displays (HMDs) in augmented reality systems increases power consumption, reducing their operating time and making it difficult to reduce power usage effectively.
Innovation Solution
A display control system that includes a head-mounted display (HMD) and a display control device, where the device wirelessly communicates with the HMD to control location and orientation detection sensors, suspending sensor data acquisition when no relevant objects are detected within a certain range, thereby reducing power consumption by optimizing sensor operation based on calculated distances and object presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous location and orientation detection is performed by sensors in HMD, then accurate AR object display is achieved, but power consumption increases
Solution Approach 1:
The system performs sensor measurements periodically rather than continuously. The processor controls the first sensor to perform first measurements at periodic intervals to acquire location information, and controls the second sensor to perform second measurements when objects are detected within the given range. This periodic measurement approach reduces power consumption while maintaining detection accuracy when needed.
Solution Approach 2:
The measurement frequency and sensor operation mode are dynamically adjusted based on detection results. When objects are detected within the given range from the user's location, the system increases measurement frequency and activates both location and orientation sensors. When no objects are detected, the system reduces measurement frequency and may suspend orientation measurements, adapting sensor operation to actual usage needs.
2Duration of action of moving object
If sensor measurements are performed continuously to maintain accurate AR display, then operating time is reduced, but if measurements are reduced to extend operating time, then detection accuracy may be compromised
Solution Approach 1:
The system implements periodic measurements with variable intervals. The processor controls sensors to perform measurements at periodic intervals, extending operating time by avoiding continuous operation. The periodic nature ensures that measurements are taken regularly enough to maintain accuracy while allowing sufficient intervals to conserve battery power.
Solution Approach 2:
The system uses feedback from detection results to adjust measurement frequency. When objects are detected within the given range, the system increases measurement frequency to maintain accuracy. When no objects are detected, measurement frequency is reduced to extend operating time. This feedback mechanism ensures accuracy is maintained when needed while maximizing battery life during periods of low activity.
Data Source
AI summary
A system includes a first sensor configured to measure a location of a first device, a second sensor configured to measure an orientation of a second device, a display, and a processor. The processor is configured to control the first sensor to start a first measurement, calculate distances between the location of the first device and each of a plurality of installation locations associated with each of a plurality of objects, each of the plurality of objects being arranged virtually at each of a plurality of installation locations in a real space, control the second sensor to start a second measurement when a distribution of the distances indicates that any of the plurality of installation locations of the plurality of objects is included in a given range from the first device, and control the display to display an object according to results of the first measurement and the second measurement.