Multispectral LED Eye-Tracker with Retinal Display
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Solution Overview
Problem
Existing eye-tracking technologies require complex designs and assumptions about eye anatomy, limiting their mobility and precision in measuring eye position and anatomy.
Innovation Solution
A wearable eyewear system with multispectral LEDs and detectors, using a diffused illumination pattern through layered lenses that scatter light, allowing precise measurement of eye position without modulating incident light or assuming specific eye anatomy, and displaying images directly on the retina.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex proximal optics and modulation algorithms are used to measure eye position, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the complex modulation and algorithmic processing from the measurement system, replacing them with a simple diffuse illumination approach. By removing the need for modulated incident light and complex reconstruction algorithms, the system achieves eye position tracking through direct detection of reflected light patterns, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent uses a camera to capture optical images of the eye, creating a visual copy of the eye's anatomical features. This optical copy allows for straightforward analysis of eye position and anatomy without requiring complex physical measurements or invasive procedures, simplifying the overall measurement system while preserving measurement accuracy.
2Device complexity
If diffuse illumination without modulation is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent employs multispectral LEDs that emit light across multiple wavelengths or spectral bands. By utilizing color or spectral variations in the illumination, the system can differentiate between various anatomical features of the eye and enhance contrast, thereby maintaining measurement precision even with a simpler diffuse illumination approach without requiring temporal modulation.
3Device complexity
If assumptions about eye anatomy are made, then algorithm complexity is reduced, but adaptability to individual variations deteriorates
Solution Approach 1:
The patent captures and analyzes multiple spectral parameters of reflected light from the eye across different wavelengths. By measuring changes in these spectral parameters, the system can adapt to individual variations in eye anatomy without requiring complex a priori assumptions, as the actual spectral characteristics of each individual's eye are directly measured and used for accurate positioning.
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
Enables mobile and precise tracking of eye movement, anatomy, and physiology with a simple design, providing accurate eye-position measurement and a heads-up display without complex assumptions about eye anatomy.
Implementation Method 1
At least one multispectral LED is fixed with or within the eyewear and is adapted to project light towards the eye
Implementation Method 2
each lens preferably is layered and diffusely scatters light onto the surface of the eye
Implementation Method 3
At least one multispectral light detector is fixed with or within the eyewear and is adapted to receive light reflected from the eye
Implementation Method 4
the system further includes a cooperative medium, such as at least one fiber optic strand, fixed between each detector and LED of each temple piece and one of the lenses
Data Source
AI summary
A tracking and display system for an eye of a person is incorporated into eyewear having at least one lens and being positionable in front of the eye or eyes with attachment hardware. A circuit with a power source is fixed with the eyewear and includes at least one multispectral LED adapted to project light towards the eye and at least one multispectral light detector adapted to receive light reflected from the eye. As such, movement, anatomy and physiology of the eye are determined according to an organized pattern of projected light reflected and received by the at least one detector. To display an image, light from the at least one multispectral LED is conveyed by at least one optical fiber to an eye-facing surface of a lens of the eyewear and then onto the retina of the person's eye to form a visible heads-up display image.