AR Projection Assembly With Holographic Beam Collimation
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Solution Overview
Problem
Existing AR devices face challenges in manufacturing complex light field control devices due to their structural design based on pixels, which complicates production and reduces the resolution of reproduced three-dimensional images.
Innovation Solution
The AR device incorporates a projection assembly with a scanner, laser, and lens groups to reduce the spot diameter and divergence angle of laser beams using holographic diffraction gratings and multiple lens configurations, improving image resolution by collimating the beams to resemble a collimated state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pixel-based light field control device is used, then the device can control light for each pixel, but the device complexity increases and manufacturing becomes complicated
Solution Approach 1:
The patent extracts the light field control function from a complex pixel-based device and implements it through a simplified optical system consisting of a scanner, lens group, and holographic diffraction grating. This removes the need for complex pixel-level control mechanisms while maintaining the essential function of light field manipulation.
Solution Approach 2:
The patent replaces the mechanical pixel-based light field control system with an optical system using holographic diffraction gratings and lens groups. This substitution eliminates complex mechanical structures and enables simpler manufacturing while achieving the desired light control and image resolution.
2Measurement precision
If laser beams are not collimated, then the device structure is simpler, but the spot diameter and divergence angle increase reducing image resolution
Solution Approach 1:
The lens group in the patent serves multiple functions: it collimates the laser beams to reduce spot diameter and divergence angle, and simultaneously works with the holographic diffraction grating to achieve light field control. This multi-functionality improves image resolution without proportionally increasing system complexity.
Solution Approach 2:
The patent changes the optical parameters of the laser beams by introducing lens groups that adjust the beam's collimation state. This modifies the spot diameter and divergence angle parameters to achieve higher image resolution while maintaining a manageable optical system complexity through careful parameter 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 configuration enhances the resolution of the reproduced three-dimensional images by minimizing the spot diameter and divergence angle of laser beams, allowing for clearer and more precise image projection.
Implementation Method 1
The first display assembly includes a first holographic diffraction grating and a first lens. The first holographic diffraction grating is disposed on the first lens.
Implementation Method 2
The first lens group includes at least one first spherical lens and/or at least one first aspheric lens. The first lens group is disposed on a light incident side and/or a light exit side of the first scanner.
Data Source
AI summary
Provided is an augmented reality device. The augmented reality device includes a first projection assembly and a first display assembly. The first display assembly is disposed on a light exit side of the first projection assembly. The first projection assembly includes a first scanner, a first laser, and a first lens group. The first display assembly includes a first holographic diffraction grating and a first lens. An exposure device is also provided.