Metasurface Glasses Lens for Balanced Chromatic Aberration Correction
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Solution Overview
Problem
Existing optical systems, particularly in head-mounted displays for VR, AR, and MR, suffer from chromatic aberrations that affect visual experience and immersion, with existing diffractive lenses failing to balance chromatic aberration correction across various field of views.
Innovation Solution
An optical system incorporating a lens assembly with a metasurface and a polarizing reflective layer, along with a phase retardation film, forms a folded optical path and employs a metasurface with varying focal powers to balance chromatic aberration correction across large, medium, and small fields of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional lens assembly is used, then the structure is simple, but chromatic aberration cannot be corrected across different field of views
Solution Approach 1:
The optical system segments the lens assembly into multiple lenses with different functions: a first lens for basic focusing, a second lens for chromatic aberration correction, and a third lens for additional optimization. This segmentation allows each lens to address specific optical issues, achieving comprehensive chromatic aberration correction across different field of views while maintaining manageable system complexity
Solution Approach 2:
The patent applies local quality by giving different regions of the optical system different properties. The first lens has a convex first surface for general focusing, while the second lens introduces specific refractive index variations to correct chromatic aberration in particular field of view regions. This localized optimization ensures that each part of the optical system addresses the specific needs of its operational zone
2Manufacturing precision
If a diffractive lens is used to correct chromatic aberration, then imaging definition improves, but the design cannot balance correction across large, medium, and small fields of view simultaneously
Solution Approach 1:
The optical system divides the field of view coverage into multiple segments handled by different lenses. The first lens provides baseline focusing for all fields of view, while the second lens with its specific refractive index profile addresses chromatic aberration in large and medium fields of view. This segmentation enables the system to maintain adaptability across different field of view sizes while achieving high imaging definition through targeted correction
Solution Approach 2:
The patent employs composite optical design by combining lenses with different refractive index characteristics. The second lens uses a refractive index that differs from the first lens, creating a composite optical system where each material contributes specific correction properties. This composite approach allows simultaneous optimization for large, medium, and small fields of view, overcoming the limitation of single-material diffractive lenses
3Manufacturing precision
If multiple lenses with different refractive indices are introduced to correct chromatic aberration, then chromatic aberration correction improves, but the device weight and size increase
Solution Approach 1:
The patent applies local quality by introducing the second lens with different refractive index only in the regions where chromatic aberration correction is needed for large and medium fields of view. The third lens further optimizes specific zones. This localized approach to material differentiation achieves comprehensive chromatic aberration correction while minimizing the overall volume and weight of the optical system, as opposed to using uniform correction across the entire optical path
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
The solution achieves improved imaging definition and a compact, lightweight design by effectively correcting chromatic aberrations across all field of views, preventing sudden changes in image clarity and ensuring visual clarity for objects at different distances.
Implementation Method 1
A metasurface, configured to regulate light incident onto the metasurface by using a geometric phase
Implementation Method 2
a polarization state of the light incident onto the metasurface is changed by the metasurface
Implementation Method 3
a lens assembly, including at least two lenses, the at least two lenses include a first surface, a second surface, a third surface, and a fourth surface that are sequentially arranged in a direction of an optical axis of the lens assembly
Implementation Method 4
a polarizing reflective layer, located on a side of the second surface away from the first surface
Implementation Method 5
a first phase retardation film, located on a side of the first surface away from the transflective film
Data Source
AI summary
An optical system, a display apparatus, a glasses lens, and glasses are provided. The optical system includes a lens assembly, a transflective film, a polarizing reflective layer, a first phase retardation film, and a metasurface. The lens assembly includes a first surface, a second surface, a third surface, and a fourth surface that are sequentially arranged in a direction of an optical axis of the lens assembly. The metasurface is located on a side of the second surface away from the first surface, and the metasurface is located on a light emitting side of the polarizing reflective layer; and the metasurface includes a first area and a second area surrounding at least part of the first area, and a focal power of the first area is less than a focal power of the second area.