Holographic 3D Display Virtual Array Splicing
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Solution Overview
Problem
Current holographic display systems using a single spatial light modulator have limited viewing visual area and display size due to pixel size constraints, making it difficult to meet viewing requirements for larger images.
Innovation Solution
The system employs virtual array splicing of a spatial light modulator by dividing a large hologram into sub-holograms and using a shutter array to sequentially illuminate different sub-holograms, creating the illusion of a larger virtual array with persistence of vision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single spatial light modulator is used for holographic display, then the system complexity is low, but the viewing visual area and display size are limited
Solution Approach 1:
The patent divides a large hologram into multiple sub-holograms that are sequentially displayed on a single spatial light modulator. The shutter array segments the illumination into multiple beams, each corresponding to a sub-hologram region, enabling the single SLM to function as a virtual array of multiple SLMs and thereby expanding the viewing visual area without increasing system complexity
Solution Approach 2:
The patent employs periodic switching of the shutter array to sequentially illuminate different sub-holograms. By rapidly switching between multiple light beams at different angles, the system creates a time-multiplexed display that persists in the viewer's vision, effectively displaying multiple sub-holograms in sequence to achieve a large visual area
2Area of stationary object
If multiple spatial light modulators are spliced on a curved surface to expand visual area, then the viewing visual area increases, but the system complexity and cost greatly increase
Solution Approach 1:
The patent creates a virtual copy of multiple spatial light modulators by using a single SLM with multiple angled light beams. Instead of physically splicing multiple SLMs on a curved surface, the system uses optical copying through beam splitting and angular deflection to simulate the effect of a multi-SLM array, thereby expanding visual area without the complexity of physical splicing
Solution Approach 2:
The patent transitions from a single-plane SLM configuration to a multi-angular illumination scheme. By introducing angular dimension through multiple light beams at different angles (θ1, θ2, θ3), the system effectively creates a virtual three-dimensional light field from a two-dimensional SLM surface, achieving large visual area without physical curvature or multiple devices
3Area of stationary object
If multiple sub-holograms are continuously loaded on a single spatial light modulator with time division multiplexing, then the visual area expands, but special requirements on the light source are introduced
Solution Approach 1:
The patent segments the illumination light into multiple parallel beams using beam splitters and deflectors, with each beam corresponding to a specific sub-hologram region. The shutter array further segments these beams for sequential activation, enabling spatial division multiplexing that expands visual area while using a single conventional laser source without special requirements
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 approach significantly expands the effective visual area and size of the holographic reconstructed image, achieving a viewing area expansion of over 3 times compared to conventional systems.
Implementation Method 1
a laser, configured to generate a coherent light beam
Implementation Method 2
The first beam splitter, the second beam splitter, and the first reflector are configured to split the light beam generated by the laser into three parallel light beams
Implementation Method 3
a spatial light modulator configured to load a sub-hologram corresponding to any one of the three sub-holograms
Implementation Method 4
the diffraction light beam passes through the third beam splitter
Data Source
AI summary
A holographic 3D display system based on virtual array splicing of a spatial light modulator includes a laser configured to generate a coherent light beam, first, second and third beam splitters, first and second reflectors, a shutter array, a spatial filter array, a solid lens, first and second light beam deflection elements and a spatial light modulator. The first and second beam splitters and the first reflector are configured to split the light beam generated by the laser into three parallel light beams to irradiate the shutter array. The shutter array is configured to control the three parallel light beams to sequentially pass therethrough according to a set time sequence. The three parallel light beams passing through the shutter array are expanded and collimated by the spatial filter array and the solid lens to form three parallel light beams with the same size and uniform intensity.