Augmented Reality Glasses with Adjustable Optical Path Lengths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current augmented reality glasses suffer from vergence-accommodation conflict, where virtual images cannot focus correctly on the human eye, leading to dizziness, and struggle to present multiple virtual images simultaneously within the human stereoscopic vision angle.
Innovation Solution
The augmented reality glasses incorporate a first and second image source with a lens set that adjusts the optical path lengths of the image beams, allowing for multiple virtual images to be presented at different distances, and positions of these sources are adjustable to align with the user's line of sight, avoiding vergence-accommodation conflict.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single virtual image is presented at a fixed distance, then the optical path length is simplified, but the vergence-accommodation conflict occurs and dizziness is caused
Solution Approach 1:
The patent divides the single virtual image into multiple virtual images at different distances by using multiple image sources (first image source and second image source) with different optical path lengths. This segmentation allows the system to present images at various depths, resolving the vergence-accommodation conflict by matching the accommodation distance with the vergence distance for each image layer.
Solution Approach 2:
The patent introduces the depth dimension by creating multiple virtual images at different distances from the user's eye. By varying the optical path lengths of different image sources, the system transforms a two-dimensional display into a three-dimensional virtual environment, allowing users to focus at different depths without conflict.
2Area of stationary object
If multiple virtual images are presented simultaneously, then the field of view is enhanced, but the device complexity increases
Solution Approach 1:
The patent segments the display system into multiple independent image sources (first image source, second image source) each responsible for specific virtual images. Each image source can be independently controlled and positioned, allowing multiple virtual images to be presented simultaneously without requiring a completely complex integrated system.
Solution Approach 2:
The lens set serves multiple functions: it focuses light from different image sources, controls optical path lengths, and directs multiple image beams to the user's eye. This multi-functionality reduces the need for separate optical components for each image source, thereby managing device complexity while enhancing field of view.
3Adaptability or versatility
If the optical path lengths of different image beams are made different, then multiple virtual images at different distances are achieved, but the alignment precision requirement increases
Solution Approach 1:
The patent employs adjustable image sources and lens sets that can dynamically adjust their positions and optical path lengths. This dynamic adjustability allows the system to compensate for manufacturing tolerances and alignment variations, achieving precise multi-distance virtual images without requiring extremely tight manufacturing precision specifications.
Solution Approach 2:
The system changes optical parameters (optical path length, focal length, position) of the lens set and image sources to achieve different virtual image distances. By making these parameters adjustable rather than fixed, the system can adapt to alignment variations and maintain precision across multiple distances without requiring ultra-precise manufacturing.
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 clear presentation of multiple virtual images without causing dizziness by ensuring the virtual images align with the user's line of sight, effectively addressing the vergence-accommodation conflict and enhancing the field of view within the stereoscopic vision angle.
Implementation Method 1
A gap is disposed between the first surface and the second surface, and a refractive index of the gap is lower than a refractive index of the first lens
Implementation Method 2
The first image beam and the second image beam enter the at least one lens set at an incident surface of the at least one lens set, are reflected at the first surface of the first lens
Data Source
AI summary
Augmented reality glasses including a first image source, a second image source and a lens set are provided. The first image source emits a first image beam. The second image source emits a second image beam. The lens set includes a first lens and a second lens and disposed on the path of the image beams. A gap is disposed between the first lens and the second lens. The refractive index of the gap is lower than that of the first lens. The image beams enter the lens set at an incident surface of the lens set, are reflected at a first surface of the first lens, and exit the lens set at an exit surface. The optical path length of the first image beam from the first image source to the eyes is different from that of the second image beam from the second image source to the eyes.