Folded Lens Assembly for MR Chromatic Aberration Correction
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Solution Overview
Problem
Chromatic aberration significantly affects image quality in mixed reality (MR) display technology, leading to blurred edges, reduced sharpness, and user discomfort due to the separation of light wavelengths at different focal points, especially in high pixel density and large field of view scenarios.
Innovation Solution
A display device and optical system design incorporating a lens assembly with a transreflective film, polarizing reflective layer, and phase delay film, utilizing a microstructure on select regions of the lens surfaces to regulate light and form a folded optical path, reducing chromatic aberration by focusing different wavelengths on a single focal plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional lens assembly is used in MR display, then the device can achieve basic display function, but chromatic aberration occurs causing blurred edges and reduced image sharpness
Solution Approach 1:
The lens assembly is divided into multiple functional surfaces (first surface with transreflective film, second surface with polarizing reflective layer, third surface with phase delay film). Each surface segment performs a specific optical function to collectively eliminate chromatic aberration while maintaining image sharpness.
Solution Approach 2:
Different regions of the lens assembly are assigned different optical properties. The first surface uses transreflective film for specific wavelength transmission, the second surface uses polarizing reflective layer for polarization control, and the third surface uses phase delay film for phase modulation. This local differentiation enables precise control over light behavior to eliminate chromatic aberration.
2Manufacturing precision
If multiple optical films and layers are added to reduce chromatic aberration, then image quality improves, but device complexity increases
Solution Approach 1:
Multiple optical functions are merged into a single integrated lens assembly structure. The transreflective film, polarizing reflective layer, and phase delay film are combined in one assembly rather than separate components, reducing overall system complexity while maintaining the ability to correct chromatic aberration and improve image clarity.
Solution Approach 2:
The lens assembly serves multiple functions simultaneously: it focuses light, controls polarization, introduces phase delays, and selectively transmits/reflects different wavelengths. This multi-functionality reduces the need for separate optical components, thereby reducing device complexity while improving image quality.
3Object-affected harmful factors
If a folded optical path is implemented using multiple surfaces and films, then chromatic aberration is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The folded optical path is segmented into distinct functional layers (transreflective film, polarizing reflective layer, phase delay film) that can be manufactured separately and then assembled. This segmentation allows each component to be optimized and manufactured using standard processes, reducing overall manufacturing complexity despite the folded path design.
Solution Approach 2:
The optical path is folded by changing the spatial arrangement and orientation of the optical films and surfaces. By adjusting parameters such as film angles, surface curvatures, and layer thicknesses, the design achieves chromatic aberration reduction while keeping manufacturing parameters within feasible ranges.
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 design reduces chromatic aberration, enhances image clarity, and allows for a more compact and cost-effective display device by optimizing the optical path and manufacturing process.
Implementation Method 1
a transreflective film, located at a side of the first surface away from the second surface
Implementation Method 2
a polarizing reflective layer, located at a side of the second surface away from the first surface
Implementation Method 3
a phase delay film, located at a side of the first surface away from the transreflective film
Implementation Method 4
only the second region is provided with a first microstructure, and the first microstructure is configured to regulate the light
Data Source
AI summary
A display device and an optical system are provided, the display device includes a display screen, a lens assembly, a transreflective film, a polarizing reflective layer, a phase delay film. The display surface of the display screen is configured to emit light; the lens assembly is at a side of the display surface emitting light; the lens assembly includes a first surface and a second surface, the first surface is a convex surface, the second surface is at a side of the first surface away from the display surface; the lens assembly includes a third surface, the third surface is located at the side of the second surface away from the first surface; at least a portion of an edge of the first region is adjacent to at least a portion of an edge of the second region; only the second region is provided with a first microstructure.