Adjustable AR Waveguide Assembly for Eye Box Alignment
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Solution Overview
Problem
Conventional augmented reality (AR) eyewear faces challenges in providing optimal display performance due to variations in user physiology and wear preferences, leading to misalignment of the eye box relative to the user's pupil, which affects image quality and availability.
Innovation Solution
The implementation of adjustable eyewear assemblies with mechanisms to fine-tune the vertical and horizontal positions of output couplers and eye boxes, allowing users to customize the fit to optimize the eye box alignment with their pupils, using adjustable couplings such as threaded posts and dials for precise adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the eye box size is increased to accommodate more users, then the adaptability improves, but the image quality (brightness and contrast) deteriorates
Solution Approach 1:
The patent implements adjustable eye boxes that can be dynamically repositioned along the optical axis relative to the output coupler. This allows the eye box position to be adapted for different users without changing the eye box size, thereby maintaining high image quality while achieving versatility across multiple users through positional adjustment rather than size increase
Solution Approach 2:
The patent changes the positional parameter of the eye box relative to the output coupler, allowing adjustment of the eye box's location along the optical axis. This parameter change enables the same eye box to serve multiple users with different physiological characteristics without compromising image quality or requiring size increases
2Adaptability or versatility
If multiple eyewear frames of different sizes are provided, then the adaptability improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent makes the eyewear frame universal by incorporating adjustable eye boxes that can be positioned to accommodate different users. Instead of creating multiple frame sizes, the single frame design achieves multi-functionality through the adjustable eye box mechanism, reducing device complexity while maintaining adaptability
Solution Approach 2:
The patent introduces dynamic adjustability to the frame structure, allowing the eye box position to be changed based on user needs. This dynamic feature replaces the need for multiple static frame sizes, simplifying the overall device while achieving the same level of user accommodation
3Ease of operation
If the eye box is not properly positioned relative to the user's pupil, then the ease of operation improves (larger eye box), but the display performance deteriorates
Solution Approach 1:
The patent incorporates mechanisms that allow users to adjust the eye box position based on feedback from their viewing experience. Users can move the eye box until they achieve optimal alignment with their pupil, ensuring both ease of operation and high display performance through user-guided optimization
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 solution enables each user to achieve a customized fit, improving image quality by allowing smaller eye boxes to be vertically and horizontally centered, resulting in enhanced brightness and contrast, and reducing power consumption while accommodating various user anatomies.
Implementation Method 1
a diffractive grating, that bends the light in order to trap the light within the waveguide 108
Implementation Method 2
The light is internally reflected within the waveguide 108 until it encounters an output coupler 112
Implementation Method 3
Output coupler 112, which also may be in the form of diffractive grating. Output coupler 112 causes the light to exit the wave guide 108
Data Source
AI summary
An adjustable frame assembly for augmented reality eyewear. The frame assembly includes a face portion for supporting at least one waveguide that creates an eye box, a support rest for supporting the face portion on a user, and a coupling for adjusting the position of the face portion relative to the support rest. This enables movement of the waveguide eye box relative to the support rest to position the eye box in front of the wearer's eyes.