Head-Motion IPD Compensation for Augmented Reality Viewing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing augmented reality near-eye displays face challenges in being lightweight, low-cost, and maintaining a wide virtual image field of view while minimizing vergence-accommodation mismatch, particularly when users change their head positions.
Innovation Solution
A viewing system that compensates for interpupillary distance (IPD) adjustments based on head motion, utilizing a head-worn component, hand-held controller, and auxiliary computing to correlate IPD with head orientation and position, employing cameras and IMUs to automatically adjust virtual reality presentations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interpupillary distance is measured for each user but not correlated to head movement, then user-specific IPD accuracy is improved, but vergence-accommodation mismatch increases when users change head positions
Solution Approach 1:
The system transitions from a static IPD measurement to a dynamic IPD adjustment system that correlates IPD with head orientation and position. The IPD is no longer fixed but varies dynamically based on detected head movements, resolving the contradiction between initial measurement accuracy and ongoing reliability during head motion.
Solution Approach 2:
The system implements feedback by using motion sensors to detect head position changes and automatically adjusting the IPD accordingly. This closed-loop approach ensures that the IPD remains accurate and reliable even when users change head positions, maintaining vergence-accommodation match throughout the viewing experience.
2Weight of moving object
If head-mounted display is made lightweight with small form-factor, then wearability and comfort are improved, but field of view and image quality may be limited
Solution Approach 1:
The system changes the parameter of IPD to dynamically adapt to head movements, allowing a compact design to maintain wide field of view and image quality. By adjusting IPD based on head orientation, the system compensates for the limitations of a small form-factor without requiring a larger or heavier optical system.
3Adaptability or versatility
If multiple focal planes are implemented, then practicality for various use-cases is improved, but vergence-accommodation mismatch increases
Solution Approach 1:
The system makes IPD dynamic rather than fixed, allowing it to adapt to different focal planes and use-cases. This dynamic adjustment maintains vergence-accommodation match across multiple focal distances, enabling versatile functionality without the typical mismatch problems associated with multi-focal displays.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention provides a viewing system including an augmented reality system that generates a visual presentation to a user based at least in part on an IPD of the user, and an IPD compensator that adjusts the visual presentation based on an IPD compensation factor.