AR Prism Waveguide Wrap Angle Dispersion Compensation
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Solution Overview
Problem
Existing augmented reality devices face challenges in maintaining ergonomic design, reducing image blur, and minimizing manufacturing costs while providing clear and sharp virtual projections.
Innovation Solution
The proposed solution involves an optical system for augmented reality devices that includes a projector, a prism, and a waveguide. The prism refracts the projected image, allowing it to be aligned parallel to the frame arm, while the waveguide is disposed at a wrap angle to compensate for dispersion and refraction, ensuring clear and sharp image delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the waveguide is disposed at a wrap angle from the projector's major axis plane, then ergonomics and device size are improved, but image dispersion and blur occur
Solution Approach 1:
A compensating element (prism or grating) is introduced as an intermediary component between the projector and waveguide to counteract the dispersion caused by the wrap angle configuration. This mediator compensates for the angular deviation, allowing the waveguide to maintain its ergonomic wrap angle position while preserving image clarity.
Solution Approach 2:
The optical parameters (such as incident angle, refractive angle, or grating period) are adjusted to compensate for the dispersion introduced by the wrap angle. By changing these parameters, the system maintains image sharpness despite the angular misalignment between projector and waveguide.
2Manufacturing precision
If traditional optical configurations are used without wrap angle, then image clarity is maintained, but device size and weight increase
Solution Approach 1:
The optical path is folded into a compact configuration by introducing the wrap angle, which utilizes three-dimensional spatial arrangement to reduce the overall device footprint and weight while maintaining optical performance through compensating elements.
Solution Approach 2:
The optical components are arranged in a nested or folded configuration where the waveguide wraps around at an angle, creating a compact structure that reduces device size and weight while the compensating element ensures image clarity is maintained.
3Device complexity
If dispersion compensation is not implemented, then manufacturing complexity is reduced, but image blur increases
Solution Approach 1:
A compensating element serves as a relatively simple intermediary component that can be integrated into the existing optical path. This element provides dispersion compensation without requiring complex system redesign, thus maintaining manufacturing simplicity while improving image sharpness.
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 configuration enhances ergonomics, reduces device size and weight, and maintains image clarity and sharpness, while also reducing manufacturing complexity and costs.
Implementation Method 1
A prism is configured to refract the image. The image includes a first spectrum, a second spectrum, and a third spectrum.
Implementation Method 2
The waveguide is disposed at a wrap angle from a plane formed from the major axis of the projector. The waveguide includes an input coupler, and an output coupler.
Data Source
AI summary
The present disclosure relates to augmented reality devices and related methods. The augmented reality devices include a projection system. The projection system includes a projector including a major axis. The projected is configured to project an image along the major axis. A prism is configured to refract the image. The image includes a first spectrum, a second spectrum, and a third spectrum. A waveguide is disposed at a wrap angle from a plane formed from the major axis of the projector. The waveguide includes an input coupler, and an output coupler.