MEMS Mirror Switching for AR Waveguide Depth Control
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Solution Overview
Problem
Current augmented reality (AR) technologies face challenges in providing a comfortable and natural-feeling presentation of virtual image elements amidst real-world imagery, often resulting in uncomfortable or ineffective depth perception due to mismatched accommodation and vergence cues.
Innovation Solution
The use of microelectromechanical systems (MEMS) mirrors for depth plane switching in wearable display systems, which reduces the size and weight of projector systems and improves ergonomics by selectively routing RGB light to appropriate depth planes, enhancing the simulation of three-dimensional imagery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional projector systems are used in AR devices, then image projection capability is achieved, but device size and weight increase, reducing user comfort
Solution Approach 1:
The patent divides the projector system into separate functional modules: a light source module, a spatial light modulator module, and an optical system module. This segmentation allows each component to be optimized independently and reduces the overall system size by eliminating redundant structures, directly addressing the contradiction between weight reduction and functional capability maintenance.
Solution Approach 2:
The patent employs a nested arrangement where the spatial light modulator is positioned within the optical path of the light source, and the waveguide display elements are integrated into the housing structure. This nesting approach maximizes space utilization, reduces the overall device footprint, and minimizes the number of external optical components needed, thereby reducing both weight and complexity.
2Measurement precision
If multiple depth planes are implemented in AR display, then depth perception is improved, but accommodation-vergence mismatch increases, reducing comfort
Solution Approach 1:
The patent implements dynamically adjustable optical elements including variable focus lenses and switchable waveguide layers that can change their optical properties in real-time. This dynamic capability allows the system to adjust the focal plane to match the vergence plane for each depth layer, eliminating accommodation-vergence mismatch while maintaining precise depth perception through multiple focal planes.
Solution Approach 2:
The patent changes optical parameters such as focal length, refractive index, and optical path length to create multiple distinct depth planes. By precisely controlling these parameters, the system generates realistic depth cues that align with natural human vision, improving depth perception accuracy while maintaining comfort through proper accommodation-vergence coupling.
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 provides a more realistic and comfortable AR experience by aligning accommodation and vergence cues, improving depth perception and reducing the size and weight of AR devices, thus enhancing user comfort and aesthetics.
Implementation Method 1
A first MEMS mirror is configured to receive the light and redirect the light to a corresponding one of the waveguides
Data Source
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AI summary
Systems and methods are provided for selectively incoupling light having different wavelengths into one of a plurality of waveguides. The systems and methods provided for selectively incoupling light having different wavelengths into one of a plurality of waveguides comprise a switching device comprising switchable reflective elements that can be configured to redirect incoming light towards an incoupling element associated with one of a plurality of waveguides.