HMD LED Flicker Frequency Differentiation for Motion Capture
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Solution Overview
Problem
Current head-mounted display devices for virtual reality suffer from inaccurate positioning and rotation detection, leading to user discomfort and dizziness due to the inability of motion capture systems to distinguish between adjacent LEDs with the same flicker frequencies.
Innovation Solution
The implementation of a head-mounted display device with a plurality of LEDs, where any two adjacent LEDs have different flicker frequencies, and a motion capture system that enhances LED recognition by adjusting brightness based on distance, ensuring accurate positioning and reducing user discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple LEDs are disposed on the device body with the same flicker frequency, then the device structure is simple and easy to manufacture, but the motion capture system cannot distinguish between adjacent LEDs leading to inaccurate positioning
Solution Approach 1:
The patent applies local quality by assigning different flicker frequencies to different LEDs based on their spatial positions. Specifically, LEDs are divided into first and second groups with distinct flicker frequencies, enabling the motion capture system to differentiate between adjacent LEDs. This localized differentiation resolves the positioning ambiguity while maintaining overall system simplicity.
Solution Approach 2:
The patent changes the flicker frequency parameter of the LEDs to solve the positioning problem. By varying the flicker frequency as a distinguishing parameter between different LEDs, the system enables accurate identification and positioning without adding complex structural elements. This parameter-based differentiation directly addresses the measurement precision issue.
2Volume of moving object
If LEDs are disposed close together to reduce device size, then the device is more compact, but adjacent LEDs with the same flicker frequency become indistinguishable to the motion capture system
Solution Approach 1:
The patent implements local quality by assigning different flicker frequencies to LEDs based on their spatial locations. Even when LEDs are disposed close together, this localized frequency differentiation ensures the motion capture system can distinguish between adjacent LEDs, maintaining both compact device volume and accurate LED detection.
Solution Approach 2:
The patent introduces a temporal dimension (flicker frequency) to distinguish between spatially close LEDs. Instead of relying solely on spatial separation, the system uses frequency modulation in the temporal domain to create distinguishable signals from closely spaced LEDs, enabling accurate detection without increasing physical distance.
3Device complexity
If all LEDs have the same flicker frequency, then the control system is simple, but the motion capture system cannot accurately track individual LED positions
Solution Approach 1:
The patent applies local quality by assigning different flicker frequencies to different LEDs based on their positions. This localized differentiation provides sufficient information for the motion capture system to track individual LED positions while keeping the overall control system relatively simple through systematic frequency assignment.
Solution Approach 2:
The patent segments the LEDs into different groups (first and second groups) with distinct flicker frequencies. This segmentation strategy enables the motion capture system to identify and track individual LEDs by their unique frequency signatures, improving position detection precision without requiring overly complex control mechanisms.
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 design improves the recognition rate of the motion capture system, increasing the fidelity of the virtual reality experience and preventing user discomfort by ensuring accurate detection and positioning of LEDs, even at longer distances.
Implementation Method 1
a plurality of light-emitting diodes (LEDs) disposed on a device body, wherein any two adjacent of the plurality of LEDs have different flicker frequencies
Data Source
AI summary
A head-mounted display (HMD) device includes a device body and a plurality of light-emitting diodes (LEDs). The plurality of LEDs are disposed on the device body. Any two adjacent LEDs have different flicker frequencies.