Holographic Display Aperture Enlargement for Wider Viewing Windows
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Solution Overview
Problem
Existing 3D image display methods, such as glasses-type and non-glasses-type methods, are limited by the number of viewpoints due to binocular parallax and cause viewer discomfort due to discrepancies between perceived depth and eye focus, while holographic displays face challenges in expanding the viewing window.
Innovation Solution
A holographic display apparatus incorporating a spatial light modulator with apertures and an aperture enlargement film that enlarges the beam diameter of light beams, using a light guide layer and grating layer to enhance viewing capabilities and reduce high-order diffraction noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 3D display methods (glasses-type or non-glasses-type) are used, then 3D images can be displayed, but the number of viewpoints is limited due to binocular parallax
Solution Approach 1:
The patent segments the light field into multiple angular components using a light field lens array, where each lens corresponds to a specific viewpoint. This segmentation allows the system to generate and display multiple viewpoints simultaneously, overcoming the limitation of conventional 3D display methods that are restricted to a single or limited number of viewpoints due to binocular parallax.
Solution Approach 2:
The patent transitions from conventional 2D display to 4D light field display by adding two angular dimensions (horizontal and vertical viewing angles). The light field lens array modulates light in both angular dimensions, creating a volumetric light field that provides expanded viewing windows in multiple directions, thereby resolving the viewpoint limitation.
2Adaptability or versatility
If conventional 3D display methods are used, then 3D images can be displayed, but perceived depth does not align with eye focus causing viewer discomfort
Solution Approach 1:
The patent segments the light field into multiple angular components using a light field lens array, where each lens corresponds to a specific viewpoint. This segmentation allows the system to generate and display multiple viewpoints simultaneously, overcoming the limitation of conventional 3D display methods that are restricted to a single or limited number of viewpoints due to binocular parallax.
Solution Approach 2:
The patent introduces a light field lens array as an intermediary optical element between the display panel and the viewer's eyes. This intermediary modulates the light field to create multiple virtual images at different depths and angles, enabling the eyes to focus at different planes while perceiving depth correctly, thus resolving the accommodation-vergence conflict.
3Adaptability or versatility
If off-axis technique is used for holographic image reproduction, then holographic images can be displayed, but the viewing window is limited
Solution Approach 1:
The patent segments the light field into multiple angular components using a light field lens array, where each lens corresponds to a specific viewpoint. This segmentation allows the system to generate and display multiple viewpoints simultaneously, overcoming the limitation of conventional 3D display methods that are restricted to a single or limited number of viewpoints due to binocular parallax.
Solution Approach 2:
The patent combines multiple functions into a single integrated system: the display panel generates the base image, while the light field lens array simultaneously performs angular modulation, viewpoint multiplication, and viewing window expansion. This multi-functional approach achieves expanded viewing windows without proportionally increasing device complexity.
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 apparatus provides an expanded viewing window with reduced high-order diffraction noise, allowing for a wider and more comfortable viewing experience by aligning perceived depth with eye focus and minimizing image degradation.
Implementation Method 1
The grating layer may be configured to transmit a portion of a light beam vertically incident on a lower surface of the grating layer from the light guide layer in a direction perpendicular to an upper surface of the grating layer, and may be configured to reflect a remaining portion of the light beam to propagate obliquely in the light guide layer
Implementation Method 2
The light guide layer may be configured to obliquely propagate the light beam reflected from the grating layer along an inside of the light guide layer based on total reflection
Implementation Method 3
an aperture enlargement film configured to enlarge a beam diameter of a light beam transmitted from each of the plurality of pixels of the spatial light modulator
Data Source
AI summary
Provided is a holographic display apparatus capable of providing an expanded viewing window when reproducing a holographic image via an off-axis technique. The holographic display apparatus includes a spatial light modulator comprising a plurality of pixels arranged two-dimensionally; and an aperture enlargement film configured to enlarge a beam diameter of a light beam coming from each of the plurality of pixels of the spatial light modulator. The beam diameter of each light beam enlarged by the aperture enlargement film may be greater than the width of an aperture of each pixel of the spatial light modulator.