3D Holographic Display Using Surface Plasmons and Light Guide Plate
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Solution Overview
Problem
Current 3D image display technologies face challenges in efficiently generating and reproducing full-color holograms due to the large amount of data required for practical sampling and transmission, limiting the effectiveness of existing hologram systems.
Innovation Solution
A 3D image displaying apparatus that utilizes a surface light source unit with a light guide plate and a metal film on a hologram to generate surface plasmons by adjusting the incident light angle, allowing for the reproduction of full-color holograms through wavelength selectivity and spatial angle modulation, reducing the system's spatial volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional hologram systems are used to display full-color 3D images, then image realism is improved, but the spatial volume and complexity of the system increases
Solution Approach 1:
The patent changes the parameter of light incident angle to control surface plasmon generation. By adjusting the incident angle of light on the metal film, the system selectively generates surface plasmons for different wavelengths (colors), enabling full-color hologram reproduction without requiring separate light sources for each color, thus reducing system complexity while maintaining image realism
Solution Approach 2:
The patent applies local quality by using a metal film with specific properties (silver, aluminum, or copper with 50-200 nm thickness) on the hologram. This localized material property enables wavelength-selective surface plasmon generation at specific incident angles, allowing the system to reproduce multiple colors through a single optical path rather than requiring multiple complex subsystems
2Adaptability or versatility
If surface plasmons are generated for multiple color beams, then full-color holography capability is improved, but the precision of angle control required increases
Solution Approach 1:
The patent introduces a light guide plate as an intermediary component between the light source and the hologram. The light guide plate receives light from a single point source and outputs it at multiple controlled angles through its optical properties, thereby mediating the angle control requirement and reducing the precision burden on the light source positioning while enabling multiple color beam generation
3Adaptability or versatility
If a light guide plate with multiple transparent areas is used to control light angles, then color reproduction capability is improved, but the device structure becomes more complex
Solution Approach 1:
The light guide plate is segmented into multiple transparent areas (first transparent area and second transparent area with different refractive indices). Each transparent area is responsible for directing light at specific angles corresponding to different wavelengths. This segmentation enables the light guide plate to control multiple output angles using a single integrated structure, improving color reproduction capability while avoiding the complexity of multiple separate optical components
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 effective full-color holography reproduction by generating surface plasmons at specific angles for each color beam, enhancing the capability to display realistic 3D images while minimizing the system's size and complexity.
Implementation Method 1
a light guide plate configured to allow incident light from the light source to enter into the light guide plate, internally reflect the allowed light, and output the internally reflected light through a light-output surface
Implementation Method 2
a metal film on a hologram to generate surface plasmons by adjusting the incident light angle
Implementation Method 3
reproduce a 3D image by diffracting the generated surface plasmons by a hologram
Implementation Method 4
a first surface on which light incident from the first transparent area is refracted
Data Source
AI summary
A 3-dimensional (3D) holographic image displaying apparatus is provided. The apparatus includes a hologram reproducer configured to generate surface plasmons in response to incident light and reproduce a 3D image by diffracting the generated surface plasmons by a hologram, and a surface light source unit including a light source and a light guide plate, the light guide plate being configured to allow incident light from the light source to enter into the light guide plate, internally reflect the allowed light, and output the internally reflected light through a light-output surface, the surface light source unit being configured to implement colors by adjusting an angle of the light incident to the hologram reproducer so that the outputted light through the light-output surface is incident to the hologram reproducer at a surface plasmon-forming angle for each wavelength to generate the surface plasmons corresponding to a plurality of color beams.