Geomagnetic Sensor-Based HMD Posture Detection
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Solution Overview
Problem
Existing head-mounted display (HMD) systems face challenges in accurately determining user operation states, particularly when the user is in non-standard postures like lying or sitting, due to the need for additional components like light receiving and emitting parts, which complicates integration with existing devices like smartphones and may not provide precise detection.
Innovation Solution
A display system that includes a wearable HMD with a first geomagnetic sensor to detect its posture and an information processing device with a second geomagnetic sensor to detect its own posture, using these sensors to compute the relative positional relationship between the HMD and the information processing device to adjust the display mode, such as reducing brightness when they face each other, without requiring additional components like light receiving or emitting parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light receiving part and light emitting part are provided on HMD side and control part side to detect user operation state, then determination accuracy of user operation state is improved, but device complexity increases and integration with existing devices becomes difficult
Solution Approach 1:
The patent replaces the optical detection system (light emitting part and light receiving part) with a magnetic field-based detection system using geomagnetic sensors. The HMD includes a first geomagnetic sensor to detect its own posture, and the control part includes a second geomagnetic sensor to detect the HMD's posture through magnetic field interactions. This substitution eliminates the need for additional optical components while maintaining determination accuracy, as the geomagnetic sensors can accurately detect the relative positional relationship between the HMD and control part without requiring line-of-sight optical paths.
2Measurement precision
If light receiving part and light emitting part are provided to detect user operation state, then determination accuracy is improved, but ease of manufacture deteriorates due to difficulty in placement
Solution Approach 1:
The patent replaces the optical detection system with a magnetic field-based detection system using geomagnetic sensors. The HMD includes a first geomagnetic sensor to detect its own posture, and the control part includes a second geomagnetic sensor to detect the HMD's posture through magnetic field interactions. This substitution eliminates the need for additional optical components while maintaining determination accuracy, as the geomagnetic sensors can accurately detect the relative positional relationship between the HMD and control part without requiring line-of-sight optical paths.
3Device complexity
If only head inclination detection is used to determine user operation state, then device complexity is reduced, but measurement precision deteriorates when user posture changes
Solution Approach 1:
The patent introduces the geomagnetic field as an intermediary between the HMD and control part for detection purposes. The first geomagnetic sensor on the HMD and the second geomagnetic sensor on the control part interact through the magnetic field to determine the relative positional relationship. This intermediary approach allows the system to detect not only head inclination but also the relative position and orientation between the HMD and control part, providing comprehensive operation state detection that works accurately regardless of user posture changes such as lying down or sitting in chairs.
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
This solution allows for accurate determination of user operation states and improved visibility of the information processing device by dynamically adjusting the display mode based on the relative positional relationship, enhancing user experience without adding unnecessary components.
Implementation Method 1
a first sensor provided at the display device and including a first geomagnetic sensor, the first sensor being configured to detect a posture of the display device
Implementation Method 2
a second sensor provided at the information processing device and including a second geomagnetic sensor, the second sensor being configured to detect a posture of the information processing device
Data Source
AI summary
A wearable display device that is a display device, an information processing device configured to connect to a wearable display device, a first sensor including a first geomagnetic sensor, a second sensor including a second geomagnetic sensor, and a display control part configured to change a display mode of the wearable display device in accordance with a relative positional relationship between the wearable display device and the information processing device on the basis of a detection result are provided.