Transparent Holographic Display with Dual-Surface Light Shielding
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Solution Overview
Problem
In display apparatuses with transparent screens, diffracted external light superimposes on image light, making it difficult to clearly display images in bright environments.
Innovation Solution
A display apparatus with a transparent screen configured by a transmissive or reflective volume hologram, featuring first and second image projection sections on opposite surfaces, and first and second light-shielding sections to prevent direct external light incidence at the same angles as the image light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent screen is used to display images, then the screen maintains transparency and allows viewing through it, but diffracted external light superimposes on image light making it difficult to clearly display images in bright environments
Solution Approach 1:
The patent introduces light-shielding sections as intermediary elements positioned between the external light source and the transparent screen. These sections selectively block external light rays that would otherwise diffract and interfere with the image light, while allowing the image light to pass through unobstructed. This mediator approach resolves the contradiction by filtering out harmful external light without compromising the transparency and image display functionality.
Solution Approach 2:
The light-shielding structure is divided into multiple segments corresponding to different viewing angles and positions. Each light-shielding section is specifically positioned to block external light from particular directions that would cause diffraction interference, while maintaining overall screen transparency. This segmentation allows selective blocking of harmful light paths without affecting the entire screen's transparency and image display capability.
2Object-affected harmful factors
If light-shielding sections are added to block external light, then diffracted external light does not superimpose on image light, but the device complexity increases
Solution Approach 1:
The light-shielding sections are strategically positioned only at specific locations where external light diffraction interference occurs, rather than covering the entire screen. Each light-shielding section is locally placed to address specific interference paths while maintaining transparency in other areas. This local quality approach reduces overall device complexity by applying light-shielding only where necessary.
Solution Approach 2:
The light-shielding sections are designed as simplified planar or angular structures that replicate the blocking function without requiring complex three-dimensional configurations. The sections can be implemented as thin films, coatings, or simple geometric barriers that copy the essential light-blocking function in a structurally simple manner, thereby reducing device complexity while maintaining effectiveness.
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 configuration prevents diffracted external light from superimposing on image light, allowing for clear image display in bright environments.
Implementation Method 1
diffracted external light is superimposed on image light
Implementation Method 2
a transparent screen configured by a transmissive or reflective volume hologram
Data Source
AI summary
There is provided a display apparatus of the present invention includes a transparent screen configured by a transmissive or reflective volume hologram, a first image projection section disposed on a first main surface side of the transparent screen, and projecting first image light onto the first main surface; and a second image projection section disposed on a second main surface side of the transparent screen, and projecting second image light onto the second main surface. The display apparatus further includes a first light shielding section preventing external light from being directly incident on the first main surface at least at same incident angle as the first image light, and a second light-shielding section preventing external light from being directly incident on the second main surface at least at same angle as the second image light.