Optical Vortex 3D Displays Using OAM Multiplexing
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Solution Overview
Problem
Existing 3D display technologies face challenges in accurately directing 2D images into different view zones or depth layers for multi-view and multi-planar displays, often requiring specialized eyewear and being limited to encoding only two views due to wavelength or polarization constraints.
Innovation Solution
The use of optical vortices and orbital angular momentum (OAM) multiplexing to encode light with spiral phase patterns, allowing for the creation of 3D displays that can project multiple views or layers without the need for special eyewear, using a single projector and passive screens that can decode and direct light into separate view zones or focal planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wavelength-based encoding (colored glasses) is used to discriminate between views, then view discrimination is achieved, but the system is limited to two views and requires expensive selective filters
Solution Approach 1:
The patent changes the encoding parameter from wavelength to orbital angular momentum (OAM) mode. By encoding images with different OAM modes (topological charges) instead of different wavelengths, the system can support multiple views beyond the two-view limitation of wavelength-based methods, while using a single projector and standard screens without expensive selective filters
Solution Approach 2:
The patent replaces the mechanical/optical filtering system (colored filters in glasses) with a computational approach using OAM encoding and decoding. The encoding is done through spiral phase patterns projected by the projector, and decoding is achieved through corresponding spiral phase patterns on the screen, eliminating the need for complex filter systems
2Adaptability or versatility
If polarized light encoding is used to discriminate between views, then view discrimination is achieved, but the system is limited to two views
Solution Approach 1:
The patent changes the encoding parameter from polarization state to orbital angular momentum mode. While polarized light has only two independent states (limiting to two views), OAM modes are unbounded, allowing encoding of multiple views with different topological charges using a single projector and standard screens
Solution Approach 2:
The patent makes the projection system universal by using a single projector that can encode multiple views through OAM modulation, rather than requiring separate projection systems for different polarizations. The standard screen also becomes multi-functional by being able to display multiple OAM-encoded views simultaneously
3Adaptability or versatility
If temporal multiplexing is used to direct images to different view zones, then multiple views are achieved, but synchronization complexity increases
Solution Approach 1:
The patent transitions from temporal multiplexing (time domain) to spatial multiplexing using OAM modes (angular momentum dimension). By encoding different views with different OAM modes simultaneously in space rather than sequentially in time, the system eliminates synchronization requirements while supporting multiple view zones
Solution Approach 2:
The patent segments the light field into different OAM modes, each carrying a separate view. This modal segmentation allows simultaneous transmission of multiple views through the same optical path without temporal synchronization, as each OAM mode is orthogonal and can be independently decoded
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
Enables the creation of autostereoscopic 3D displays that can provide three or more views/layers without the need for special eyewear, overcoming limitations of previous technologies by using a single projector and passive screens, and allowing for unbounded OAM modes for multiple view zones or layers.
Implementation Method 1
displaying a hologram that combines three images encoded into three different OAM channels
Implementation Method 2
reflecting light from the displayed hologram to create a multichannel light beam
Implementation Method 3
The decoding screen is adapted to decode the multichannel light beam and direct the decoded images into different directions
Data Source
AI summary
A method for generating three dimensional (3D) displays. The method includes displaying a hologram that combines three (or more) images encoded into three (or more) different OAM channels, and the method also includes reflecting light from the displayed hologram to create a multichannel light beam. Then, the method involves decoding the multichannel light beam to decode and display the three encoded images. The decoding step includes displaying the three encoded images in decoded form in three view zones, three focal planes, or on three spaced-apart planes. The decoding is performed by a single decoding screen using holograms used for generating the three encoded images or is performed by three decoding screens configured based on a differing one of the holograms used for generating the three encoded images. The displaying of the hologram step includes operating a spatial light modulator (SLM) to display the hologram on a screen of the SLM.