VR Pancake Optical System Curvature Design
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Solution Overview
Problem
Existing VR devices face challenges in achieving a balance between lightness, high imaging quality, and comfortable wearing experience, particularly in the design of optical systems for consumer-grade VR optics.
Innovation Solution
The optical system comprises a lens component with at least three lenses, a polarized reflection layer, a transflective film, and a phase retardation film, specifically arranged to enhance imaging clarity and field of view while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a pancake architecture optical system is used, then the device becomes lighter and more compact, but the imaging quality and field of view are compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the curvature radii of lens surfaces (third surface: 2-10mm, fourth surface: 1.5-2.5mm) and adjusting the conic constants to achieve optimal optical performance. By changing these geometric parameters, the system maintains compact pancake architecture while improving imaging quality and field of view.
Solution Approach 2:
The patent employs composite optical systems combining multiple lens components with different materials and properties. The lens component includes at least three lenses with specific curvature characteristics, and the system integrates a polarized reflection layer, transflective film, and phase retardation film to achieve both compactness and high imaging quality.
2Volume of moving object
If the optical path is folded to reduce size, then the device becomes more compact, but the clarity and resolution are reduced
Solution Approach 1:
The patent implements a folded optical path that transitions from a linear one-dimensional arrangement to a three-dimensional configuration. The light path folds back through the polarized reflection layer and transflective film, allowing the optical system to achieve compact volume while maintaining clarity through precise surface parameter design.
Solution Approach 2:
By precisely controlling the curvature radii and conic constants of the lens surfaces, the patent compensates for the optical path folding. The third surface has a curvature radius ratio of 2-10 and conic constant of -50 to 0, while the fourth surface has a curvature radius ratio of 1.5-2.5 and conic constant of -10 to 2, maintaining optical clarity despite the compact folded structure.
3Manufacturing precision
If multiple lens components are added to improve imaging quality, then the resolution is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges multiple functional elements into an integrated optical system. The lens component includes at least three lenses with specific curvature characteristics, and these are combined with the polarized reflection layer, transflective film, and phase retardation film in a unified compact structure, achieving high resolution without proportional increases in complexity.
Solution Approach 2:
The optical system is designed with multi-functionality where the lens component and film layers serve multiple purposes simultaneously. The same structural elements contribute to both optical correction, polarization control, and compact form factor, reducing overall system complexity while maintaining high resolution.
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 improves the degree of freedom in designing surface type parameters, achieves light retroreflection, and enhances the optical system's clarity and resolution, leading to a more comfortable and immersive VR experience.
Implementation Method 1
a polarized reflection layer, disposed on a side of the third surface that is away from the fourth surface
Implementation Method 2
achieves light retroreflection
Implementation Method 3
a lens component, includes at least three lenses, the at least three lenses include a first surface, a second surface, a third surface, a fourth surface, a fifth surface and a sixth surface arranged sequentially along a direction of an optical axis
Implementation Method 4
a phase retardation film, disposed on a side of the transflective film facing the second surface
Data Source
AI summary
An optical system and a display apparatus are provided. The optical system includes: a lens component, a polarized reflection layer, a transflective film, and a phase retardation film; a distance between two intersection points where the first surface and the second surface intersect with the optical axis is a first distance, a distance between two intersection points where the third surface and the fourth surface intersect with the optical axis is a second distance, and a distance between two intersection points of the fifth surface and the sixth surface intersect with the optical axis is a third distance; a ratio of an absolute value of a curvature radius of the fourth surface to an absolute value of a curvature radius of the third surface is 0.8 to 1, the second distance is greater than the first distance, and the second distance is greater than the third distance.