Angle Enhancing Screen Lenslet Array Field of View
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Solution Overview
Problem
Current 3D display technologies, such as spatial light modulators and optical vortex displays, face limitations in simultaneously increasing the size and field of view of holograms due to the optical invariant, resulting in small images and restricted viewing angles.
Innovation Solution
The implementation of an angle-enhancing screen utilizing a combination of a field lens and a double lenslet array, including Keplerian or Galilean lens pairs, which straightens and enlarges the field of view while maintaining image size by decreasing pixel size and pitch, allowing for increased field of view without flipping views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If optical demagnification is used to increase the size of holograms, then the image size is improved, but the field of view deteriorates
Solution Approach 1:
The screen is divided into multiple lenslet elements arranged in an array, where each lenslet independently manipulates light from corresponding pixel regions. This segmentation allows the system to expand the field of view by directing light from different pixel regions to different viewing angles while maintaining overall image size enlargement through the collective action of all lenslets
Solution Approach 2:
The lenslet array adds a spatial dimension to the projection system by introducing angular manipulation capability. Each lenslet redirects light rays at different angles, effectively adding a viewing angle dimension to the原本 two-dimensional image plane, thereby increasing field of view without sacrificing image size
2Ease of operation
If optical demagnification is used to increase the field of view of holograms, then the field of view is improved, but the image size deteriorates
Solution Approach 1:
The screen is divided into multiple lenslet elements arranged in an array, where each lenslet independently manipulates light from corresponding pixel regions. This segmentation allows the system to expand the field of view by directing light from different pixel regions to different viewing angles while maintaining overall image size enlargement through the collective action of all lenslets
Solution Approach 2:
The lenslet array adds a spatial dimension to the projection system by introducing angular manipulation capability. Each lenslet redirects light rays at different angles, effectively adding a viewing angle dimension to the原本 two-dimensional image plane, thereby increasing field of view without sacrificing image size
3Area of stationary object
If the size and field of view are increased simultaneously through optical demagnification, then both parameters are improved, but the optical invariant prevents this from being achieved
Solution Approach 1:
The lenslet array acts as an intermediary optical element between the projection lens and the viewer. It mediates the light rays by redirecting them at different angles while preserving the overall image size, effectively bypassing the optical invariant constraint that would otherwise prevent simultaneous increase of both size and field of view
Solution Approach 2:
The screen is divided into multiple lenslet elements arranged in an array, where each lenslet independently manipulates light from corresponding pixel regions. This segmentation allows the system to expand the field of view by directing light from different pixel regions to different viewing angles while maintaining overall image size enlargement through the collective action of all lenslets
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 effectively increases the field of view while maintaining image size, providing a coherent 3D experience without the need for exact alignment of lenslets and pixels, and can be applied to various 3D display technologies like holograms and light fields.
Implementation Method 1
The angle-enhancing screen includes a field lens and a double lenslet array, including Keplerian or Galilean lens pairs, which straightens and enlarges the field of view
Data Source
AI summary
Implementations of angle-enhancing screens are disclosed herein. The angle-enhancing screens increase the field of view of an image projected thereon by a projection lens while maintaining an increased size of the projected image, by decreasing the size of picture elements making up the image while maintaining their pitch. In some embodiments, the angle-enhancing screen includes a field lens, such as a Fresnel field lens, for straightening the views of light projected thereon and a double lenslet array of matched lenslet pairs, each of the pairs including either two positive lenslets or one positive and one negative lenslet, for increasing the field of view. In another embodiment, the angle-enhancing screen may include a field lens and an array of four positive lenslet quartets. In a further embodiment, the field lens may be replaced with a Gabor superlens including two lenslet arrays of different pitches.