HMD Sensor Group Activation for Head Rotation Accuracy
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Solution Overview
Problem
Head-mounted displays (HMDs) struggle to accurately sense the rotation of a user's head while in motion, leading to incorrect operations and a lack of precision in displaying surrounding images corresponding to the user's intended view.
Innovation Solution
The HMD controls activation of sensor groups based on its static or moving state, using a combination of sensors to detect the front direction and correct sensing information, including setting reference images and receiving travel information from external devices to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the HMD uses sensor groups to detect head rotation, then the surrounding image can be displayed according to user orientation, but the detection accuracy deteriorates when the HMD is in a moving state
Solution Approach 1:
The system dynamically adjusts sensor group activation based on detected motion state. When motion is detected, the system switches from using all sensors to using only a subset of sensors that are less affected by motion artifacts, thereby maintaining detection reliability during movement while preserving accuracy during static periods.
Solution Approach 2:
The system changes the operational parameters of the sensor groups based on motion state. Different sensor groups are activated or deactivated depending on whether the HMD is stationary or moving, effectively changing which sensors are in use to optimize performance for the current state.
2Measurement precision
If the HMD activates all sensor groups continuously, then detection coverage is maximized, but energy consumption increases
Solution Approach 1:
Instead of continuous activation, the system periodically activates sensor groups based on motion detection events. Sensors are activated only when needed (during state transitions or motion events) and deactivated during static periods, reducing overall energy consumption while maintaining detection coverage when required.
Solution Approach 2:
The sensor activation pattern is dynamic rather than static. The system transitions between different activation states (full activation, partial activation, deactivated) based on real-time motion detection, optimizing the balance between coverage and energy consumption.
3Measurement precision
If the HMD uses multiple sensor groups, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The sensor system is segmented into multiple independent sensor groups, each with specific functions. This segmentation allows the system to manage complexity by treating each group as a separate unit that can be independently activated or deactivated based on motion state, rather than managing a monolithic complex sensor system.
Solution Approach 2:
Multiple sensor groups serve universal purposes - they can all detect head rotation, but different groups are activated depending on the situation. This multi-functionality allows the system to maintain detection capabilities across different states without requiring separate dedicated systems for each state.
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 approach improves the accuracy of detecting head rotation and reduces the likelihood of incorrect operations by activating appropriate sensor groups and correcting sensing information in real-time, providing a more precise and intuitive virtual environment experience.
Implementation Method 1
a first sensor group configured to sense a motion of the HMD
Implementation Method 2
a second sensor group configured to capture a circumjacent image of the HMD
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
A head mounted display (HMD) configured to provide a surrounding image is disclosed. The HMD includes a display unit configured to display a section of the surrounding image corresponding to a front direction of the HMD, a first sensor group including at least one sensor configured to sense motion of the HMD, a second sensor group including at least one sensor provided to the HMD to capture a circumjacent image, and a processor configured to control the display unit, the first sensor group and the second sensor group to acquire first sensing information from the first sensor group and second sensing information from the second sensor group, wherein the processor detects a state of the HMD using at least one of the first sensing information and the second sensing information, the state of the HMD including a static state in which an absolute position of the HMD does not change and a moving state in which the absolute position changes, detects, when the state of the HMD is detected as the static state, a direction in which a front of the HMD faces based on the first sensing information or on the first sensing information and the second sensing information, detects, when the state of the HMD is detected as the moving state, the direction in which the front of the HMD faces based on the second sensing information or based on the second sensing information and the corrected first sensing information, and displays an image of a section of the surrounding image corresponding to the detected direction.