Selective Wavelength Tracking for Head-Mounted Displays
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Solution Overview
Problem
Existing head-mounted display devices face inaccuracies in motion tracking due to interference from ambient light and other light sources, which affects the virtual reality or augmented reality experience by mismatching the movement of the device with the visual feedback provided to the user.
Innovation Solution
The implementation of an electronic device communicating with a portable device and optical sensors, which selects distinct wavelengths for tracking, initiates the portable device to emit light, and determines its position based on the detected intensities of these wavelengths, reducing interference from ambient and other light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical signals are used for tracking position and movement, then tracking capability is enabled, but accuracy deteriorates due to interference from ambient light and other light sources
Solution Approach 1:
The patent segments the optical tracking system into distinct wavelength channels, with each channel operating at a specific wavelength. This segmentation allows the system to isolate and track individual devices by their unique wavelength signatures, effectively filtering out ambient light interference that does not match the assigned wavelengths.
Solution Approach 2:
Each portable device is assigned a specific local quality in the form of a unique wavelength or wavelength combination. This local quality differentiation enables the optical sensors to distinguish between multiple devices and reject background light, as the sensors only respond to the specific wavelengths emitted by each device.
2Productivity
If multiple devices are tracked simultaneously using optical signals, then tracking coverage is improved, but measurement precision deteriorates due to light interference between devices
Solution Approach 1:
The system segments the optical spectrum into multiple wavelength channels, assigning each portable device a unique wavelength or wavelength combination. This segmentation allows multiple devices to be tracked simultaneously without mutual interference, as the optical sensors can distinguish between different wavelengths.
Solution Approach 2:
The patent changes the wavelength parameter for each portable device to enable simultaneous tracking. By varying the wavelength parameter across multiple devices, the system maintains measurement precision while increasing tracking coverage, as each device's light signature remains distinct and identifiable.
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 method enhances the accuracy and speed of tracking the motion of head-mounted displays and associated devices, thereby improving the user experience in virtual and augmented reality environments by minimizing positional mismatch.
Implementation Method 1
initiate the first portable device to emit light of the first set of one or more selected wavelengths
Implementation Method 2
receive information identifying intensities for the first set of one or more selected distinct wavelengths from the one or more optical sensors
Data Source
AI summary
An electronic device is configured to select a first set of one or more distinct wavelengths for tracking a first portable device in communication with the electronic device; and, subsequent to selecting the first set of one or more distinct wavelengths for tracking the first portable device, initiate the first portable device to emit light of the first set of one or more selected wavelengths; receive information identifying one or more respective intensities of light, detected by the one or more optical sensors, for the first set of one or more selected wavelengths; and determine a position of the first portable device based on the information identifying the one or more respective intensities of light, detected by the one or more optical sensors, for the first set of one or more selected wavelengths. A method for determining a position of the first portable device is also described.