3D Holographic Display Viewing Zone Extension via Spatial Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Holographic displays have limited viewing angles due to their pixel pitch and existing technologies struggle to improve SLM performance beyond flat panel display limitations, necessitating high-resolution panels with dense sub-micrometer pitches.
Innovation Solution
The implementation of a 3D holographic display system that uses a diffractive optical element (DOE) for spatial-division multiplexing, where a diffraction apparatus with higher resolution than the SLM pixel pitch deflects and propagates light waves to extend the viewing angle, allowing multiple partial lattices to map to SLM image pixel groups and change the diffraction angle to predetermined angles, effectively increasing the viewing zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the viewing angle of a holographic display is increased, then the viewing zone is extended, but the pixel pitch requirements become more stringent requiring sub-micrometer dense pitches
Solution Approach 1:
The patent divides the holographic display system into multiple SLM panels arranged in a matrix configuration. Each panel handles a specific angular range, and the combined output of multiple panels achieves the extended viewing zone without requiring each individual panel to have ultra-fine sub-micrometer pixel pitch. This segmentation allows standard pixel pitches to achieve broader viewing angles through spatial multiplexing.
Solution Approach 2:
The patent transitions from a single-plane 2D display approach to a three-dimensional spatial multiplexing architecture where multiple SLM panels are positioned at different angular orientations. By adding the angular dimension to the display architecture, the system extends the viewing zone without compressing the pixel pitch to sub-micrometer levels, thus avoiding the manufacturing precision bottleneck.
2Measurement precision
If conventional SLM performance is improved through flat panel display technology, then display resolution increases, but there are fundamental limitations that prevent further viewing angle expansion
Solution Approach 1:
The patent merges multiple SLM panels with different angular orientations into a unified holographic display system. By combining the output of multiple panels that each have optimized resolution for their respective angular ranges, the system achieves both high display resolution and extended viewing angles, overcoming the limitations of individual flat panel SLMs.
Solution Approach 2:
The patent creates a multi-functional display system where the same SLM panel technology serves multiple angular viewing zones simultaneously. Each panel is designed to cover a specific angular range, and the collective system provides universal coverage across a broad viewing zone, making the display adaptable to various viewing positions without requiring different hardware for each angle.
3Area of moving object
If time multiplexing and spatial multiplexing are used to improve display performance, then viewing angle and viewing zone are extended, but the system complexity increases
Solution Approach 1:
The patent segments the spatial multiplexing into a regular matrix arrangement of SLM panels with defined angular orientations. This structured segmentation simplifies the control architecture compared to arbitrary spatial multiplexing, as each panel's position and function are predetermined, reducing the complexity of real-time coordination while still achieving extended viewing zones.
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 enhances the viewing angle of holographic displays, enabling wider viewing zones and full-parallax observation by reconstructing hologram images at extended viewpoints, surpassing the limitations of conventional SLM performance.
Implementation Method 1
DOE (diffractive optical element) is a device that changes the phase or intensity characteristic of a propagated light by using light diffraction
Implementation Method 2
The holographic display includes at least one SLM (spatial light modulator) that modulates the amplitude or phase of the incident interference light
Implementation Method 3
Holographic optical elements (HOEs) are a type of DOE that is fabricated by recording interference fringes on a photosensitive material using an interference system
Implementation Method 4
Holographic optical elements (HOEs) are a type of DOE that is fabricated by recording interference fringes on a photosensitive material
Data Source
AI summary
In the present invention, by providing a 3D holographic display system comprising a modulation apparatus configured to modulate light emitted from a light source into a light wave corresponding to a 3D image, an optical apparatus configured to propagate the light wave into the first plane, and a diffraction apparatus configured to multiplex the propagated light wave to extend viewing angle of the 3D holographic display, a limited viewing zone of the holographic display determined by the SLM pixel pitch, may be extended by optical methods, such as using diffractive optical elements (DOE) for spatial-division multiplexing (SDM).