Eye Glint Imaging for Focus Tracking in See-Through Displays
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Solution Overview
Problem
Existing see-through computer display systems face challenges in optimizing user experience due to complex content presentation, particularly in transitioning between augmented and virtual reality modes, and in maintaining clear visibility of the environment while presenting digital content.
Innovation Solution
A head-worn display system that adjusts digital content presentation by shifting it into blank areas of the field of view, adjusting convergence distance and position based on user gaze and focus, using an eye imaging system to enhance the user's perception of digital content and maintain clear visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If digital content is presented in the center of the field of view, then interaction with augmented reality objects is improved, but the user's view of the environment is blocked
Solution Approach 1:
The system dynamically shifts the position of digital content within the field of view based on detected eye gaze direction. When the user looks toward the edge of the field of view, the content follows the gaze and repositions accordingly, allowing the user to maintain both environmental awareness and content interaction without fixed positioning constraints.
2Illumination intensity
If the field of view is expanded to show more environment, then visibility is improved, but the resolution and quality of digital content decreases
Solution Approach 1:
The system implements variable resolution rendering where digital content maintains high resolution and detail regardless of its position within the field of view. The content is rendered at full quality and dynamically repositioned based on eye tracking data, ensuring that the user always receives high-fidelity visual information for interactive elements while the rest of the field of view can accommodate environmental visibility.
3Stability of the object's composition
If digital content is positioned at fixed convergence distance, then focus is maintained, but adaptability to different user interactions is reduced
Solution Approach 1:
The system dynamically adjusts the convergence distance of digital content based on detected eye gaze direction and distance. As the user moves their eyes to track content at different positions in the field of view, the content's convergence point and focal distance are updated in real-time, maintaining proper focus and depth perception while adapting to various interaction scenarios.
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
Enhances user experience by optimizing digital content presentation in see-through displays, ensuring clear visibility of the environment and improving interaction with augmented reality objects by adjusting convergence and position based on user interaction.
Implementation Method 1
The eye imaging system images a front perspective of the user's eye
Data Source
AI summary
Disclosure herein concerns a method that includes illuminating a user's eye with an illumination source in a head-worn display, capturing an image of the user's eye with an eye camera in the head-worn display, wherein the image includes an eye glint produced by light from the illumination source that is reflected from a surface of the user's eye, determining a size of an eye glint in the captured image, and identifying a change in focus distance for the user's eye in correspondence with a change in the size of the eye glint.