Electromagnetic Handle Positioning for HMDs
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Solution Overview
Problem
Optical positioning solutions in head-mounted display systems are prone to being blocked, leading to poor accuracy and high latency in 6-degree-of-freedom spatial positioning of handles, especially due to angle of view limitations and low camera refresh rates.
Innovation Solution
Implementing a method and device that uses electromagnetic waves for handle positioning, where a wireless radio frequency master device on the head-mounted device pairs with slave devices on handles, and an electromagnetic wave receiver calculates position and posture information based on induced electromotive forces, reducing interference through frequency-hopping and distinct emission frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical positioning solutions are used with multiple cameras or light towers, then positioning coverage is improved, but the system becomes liable to blocking and cannot fully eliminate blind spots
Solution Approach 1:
The patent replaces the optical positioning system (cameras and light towers) with an electromagnetic positioning system using emitters and receivers. This substitution eliminates the blocking issue inherent in optical systems by using electromagnetic waves that can penetrate or pass through obstacles more effectively, while maintaining comprehensive positioning coverage.
Solution Approach 2:
The patent changes the fundamental parameter of the positioning signal from optical waves to electromagnetic waves. This parameter change allows the positioning system to operate without being blocked by physical obstacles, as electromagnetic waves have different propagation characteristics that enable them to pass through or around objects that would block light.
2Measurement precision
If camera-based positioning is used, then spatial positioning can be achieved, but the refresh rate is low causing large latency
Solution Approach 1:
The patent replaces the camera-based optical measurement system with an electromagnetic signal-based positioning system. Electromagnetic signals can be transmitted and processed at much higher rates than camera frame rates, thereby reducing latency while maintaining or improving spatial positioning accuracy through more frequent position updates.
3Reliability
If multiple feature points are provided on HMD and handle, then blind spots are minimized, but the system complexity increases
Solution Approach 1:
The patent replaces the complex system of multiple cameras, light towers, and numerous feature points with a simpler electromagnetic positioning system. Each handle contains an emitter, and the HMD contains receivers, eliminating the need for multiple feature points and complex optical infrastructure while achieving reliable positioning accuracy.
4Measurement precision
If optical positioning is used at the edge of the field of view, then positioning can be attempted, but the accuracy is poor
Solution Approach 1:
The patent changes the positioning signal from optical to electromagnetic, which eliminates field of view limitations. Electromagnetic receivers can detect signals from emitters in all directions without the angular constraints that affect camera-based systems, thereby maintaining high positioning accuracy even at what would traditionally be considered edge-of-field positions.
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 effectively reduces jitter and improves spatial positioning accuracy of handles, addressing the limitations of optical positioning and enhancing the accuracy of 6DOF data, particularly in dual-handle scenarios.
Implementation Method 1
an electromagnetic wave receiver on the head mounted device to receive electromagnetic waves emitted by an electromagnetic wave emitter of the first handle and an electromagnetic wave emitter of the second handle and generate an induced electromotive force
Data Source
AI summary
Positioning a handle in a head mounted display system, and a head mounted display system. A wireless radio frequency master device is used on a head mounted device in the head mounted display system to perform operations of pairing with a wireless radio frequency slave device of a first handle and a wireless radio frequency slave device of a second handle. An electromagnetic wave receiver is used to receive electromagnetic waves emitted by an electromagnetic wave emitter of the first handle and an electromagnetic wave emitter of the second handle and generate an induced electromotive force. And, calculating position and posture information corresponding to the first handle and information of position and posture corresponding to the second handle respectively, wherein the position and posture information includes position translation information and direction rotation information when the wearer wears the first handle or the second handle.