Coarse Integral Holographic Display for Seamless Full Parallax
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Solution Overview
Problem
Existing holographic displays face challenges in providing a large field of view with both horizontal and vertical parallax due to limitations in spatial light modulator pitches and tiling methods, which result in seams and reduced resolution, making them unsuitable for interactive and multi-viewer applications.
Innovation Solution
A holographic display system combining multiple low-pitch spatial light modulators with coarse integral optics to create a wide field of view display with adjustable horizontal and vertical parallax, using angular tiling to combine elemental holograms into a super hologram.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple SLMs are spatially tiled to increase display size or field of view, then the field of view or display area is improved, but visible seams appear in the holographic image due to gaps between SLMs
Solution Approach 1:
A diffuser is introduced as an intermediary optical element between the array of SLMs and the viewer. The diffuser scatters light from each SLM element, causing the light fields to overlap and blend together. This mediation eliminates the visible seams that would otherwise appear at the boundaries between adjacent SLMs, creating a seamless holographic image across the entire display area.
2Area of stationary object
If the pitch of the SLM is made fine to increase field of view, then the field of view is improved, but the display size must be increased which is generally unacceptable
Solution Approach 1:
The display system is segmented into multiple independent SLM elements arranged in an array, where each element contributes to a portion of the overall field of view. By dividing the total field of view requirement across multiple segments rather than requiring a single large SLM with fine pitch, the system achieves a wide field of view without needing an excessively large display size. The diffuser integrates these segmented views into a unified holographic image.
3Area of stationary object
If multiple SLMs are arranged in an arc to increase field of view, then the field of view is improved, but the holographic images overlap in the center and resolution is reduced
Solution Approach 1:
Each SLM element in the array is assigned a specific angular range or viewing zone, creating local quality differentiation across the array. The diffuser ensures that light from each element is directed to its appropriate angular range, preventing overlap in the center region. This local optimization of light distribution maintains high resolution across the entire field of view by ensuring each spatial frequency component is properly allocated to its designated angular range.
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
The system achieves a full parallax super hologram with continuous horizontal and vertical parallax, reducing computational costs and visual seams, suitable for interactive and multi-viewer applications.
Implementation Method 1
Holography is a technique that enables three-dimensional (3D) images to be generated, recorded, and later displayed. It typically involves the use of a laser, interference, diffraction, light intensity recording, and suitable illumination of the recording.
Implementation Method 2
Holography is a technique that enables three-dimensional (3D) images to be generated, recorded, and later displayed. It typically involves the use of a laser, interference, diffraction, light intensity recording, and suitable illumination of the recording.
Implementation Method 3
a coarse integral optics assembly adapted to combine the plurality of elemental holographic images into a single hologram viewable in a hologram image plane a distance apart from the course integral optics assembly
Data Source
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AI summary
A holographic display system (100) for generating a super hologram (150) with full parallax in the horizontal and vertical directions. The system includes an array of holographic display devices (110), e.g., spatial light modulators (SLMs, 114), operable to provide a plurality of holographic images (115) of a scene from differing viewpoints of the scene. Each SLM is operated concurrently to output a narrow field of view, elemental hologram. The system includes coarse integral optics (120) combining the holographic images into a single hologram ("super hologram", 150) viewable in a hologram image plane a distance from the coarse integral optics. The coarse integral optics combine the holographic images by providing angular tiling of the holographic images, e.g., bending the axes (141) of parallel lenses. In this manner, the field of view, in one direction, of the super hologram is based on the number of holographic display devices provided in the array in one direction.