Wearable Heads-Up Display Optically Replicated Exit Pupils
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Solution Overview
Problem
Conventional wearable heads-up displays face challenges in providing a customized fit that aligns with individual users' head and facial features, resulting in bulkiness and a lack of fashion appeal, while achieving a large eyebox without increasing bulk is difficult due to the trade-off between eyebox size and display resolution.
Innovation Solution
The system employs optically replicated exit pupils to expand the eyebox in scanning laser-based wearable heads-up displays, allowing multiple exit pupils to be spatially distributed over a larger area, ensuring visibility across a range of gaze directions without compromising bulkiness or aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wearable heads-up displays use large display components to accommodate all users, then the device can be mass-produced with a universal design, but the device becomes bulkier and less stylish
Solution Approach 1:
The patent segments the display system into multiple optical zones corresponding to different eye positions and gaze directions. By dividing the optical path into distinct regions that can be independently optimized, the system achieves customized fit for individual users without requiring a completely custom device for each person, thus reducing overall device bulk while maintaining adaptability.
Solution Approach 2:
The patent utilizes the third dimension (depth/z-axis) by positioning multiple display components at different optical distances and angles. This dimensional approach allows the system to expand the eyebox volume in three-dimensional space without increasing the lateral footprint of the device, thereby maintaining a compact form factor while accommodating various user anatomies.
2Volume of moving object
If a wearable heads-up display is designed with a small eyebox centered on the pupil, then the device can maintain minimal bulk, but the content disappears when the user gazes off-center
Solution Approach 1:
The optical system is segmented into multiple functional zones, each optimized for specific gaze directions. By creating distinct optical pathways for different viewing angles, the system maintains a compact form factor while ensuring content remains visible across a wide range of gaze directions without requiring the user to return to a central viewing position.
Solution Approach 2:
The patent implements dynamic optical adjustment where the display system adapts to the user's natural head and eye movements. Through multiple display components positioned at different orientations, the system dynamically provides appropriate visual content for each gaze direction, making the device as comfortable and natural to wear as conventional eyeglasses.
3Manufacturing precision
If a wearable heads-up display is designed to align the eyebox on the pupil for some users, then those users can see the content, but the eyebox becomes misaligned relative to the pupil of other users with different facial structures
Solution Approach 1:
The patent creates a universal display system that serves multiple user types simultaneously through its multi-component optical architecture. Each display component is designed to handle specific user anatomy variations, and the combination of these components provides a universal solution that adapts to different facial structures without requiring custom manufacturing for each user.
Solution Approach 2:
Different regions of the optical system are optimized for different user characteristics. By assigning specific optical functions to different components based on their performance characteristics, the system achieves high alignment precision for each user type in the appropriate local zone while maintaining overall system compatibility across diverse populations.
4Area of stationary object
If demonstrated techniques are used to provide a wearable heads-up display with a large eyebox, then the eyebox size increases, but more bulky optical components must be added to the display
Solution Approach 1:
The patent expands the eyebox primarily in the depth dimension (z-axis) by positioning multiple display components at different optical distances from the eye. This approach increases the volumetric eyebox available to the user without significantly increasing the lateral dimensions of the device, thereby achieving a large functional eyebox while maintaining a compact form factor suitable for fashion-conscious consumers.
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 approach enables a larger eyebox with reduced bulk, providing a comfortable and stylish fit tailored to individual users while maintaining high display quality and resolution.
Implementation Method 1
The optical performance of a wearable heads-up display is an important factor in its design... Some wearable heads-up displays are manufactured only in a single universal design... The eyebox refers to the range of eye positions (relative to the device itself) over which specific content/imagery provided by a device is visible to the user... demonstrated techniques for providing a wearable heads-up display with a large eyebox generally necessitate adding more bulky optical components to the display
Implementation Method 2
The system employs optically replicated exit pupils to expand the eyebox in scanning laser-based wearable heads-up displays, allowing multiple exit pupils to be spatially distributed over a larger area, ensuring visibility across a range of gaze directions without compromising bulkiness or aesthetics
Data Source
AI summary
Systems and methods for fitting a wearable heads-up display (WHUD) to a subject are described. Imaging data representative of at least a portion of the subject's head with one or more gaze positions of the eyes is obtained from a plurality of cameras. One or more models representative of the subject's head are generated and a set of features is recognized in the one or more models. One or more models of the WHUD are also obtained based on WHUD data stored in memory. One or more simulations are performed positioning one or more WHUD models in proximity to at least one subject model based at least in part on the set of features recognized in the subject model. A fit of a WHUD to the subject is evaluated based at least in part on a determination regarding whether the simulation satisfies one or more of a set of criteria.