Transparent Panel with Birefringent Lens Array for Compact Projection
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Solution Overview
Problem
Conventional transparent display systems face challenges in maintaining image quality and user recognizability due to poor diffusion and reflection of projected images, requiring increased system volume and optical distance.
Innovation Solution
A transparent panel comprising a polarization plate, a transparent diffusion plate, a ¼ wavelength plate, and a lens part with a birefringent lens array and refractive index alignment member, which converts and refracts light to enhance image transmission and diffusion, eliminating the need for a half-mirror and reducing system volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional projection type transparent display apparatus is used, then an image can be projected onto a transparent panel, but a large optical distance of at least a predetermined size between the transparent panel and image projection apparatus is required, increasing system volume
Solution Approach 1:
The patent extracts the optical distance requirement by introducing a half-mirror that reflects projected light back through the transparent panel, eliminating the need for a large separation between the projector and panel. This allows the system to function with minimal distance while maintaining projection quality.
Solution Approach 2:
The patent implements a nested structure where the half-mirror is integrated into the transparent panel assembly, and the projection path is folded back through the same panel. This nesting allows the optical path to be contained within a compact volume, reducing overall system size.
2Stability of the object's composition
If a conventional transparent display apparatus is used, then transparency is maintained, but the projected image is not diffused well and is reflected, deteriorating user recognizability
Solution Approach 1:
The patent introduces a diffusion layer as an intermediary between the half-mirror and the transparent panel. This diffusion layer mediates the reflected light by scattering it in multiple directions, preventing direct reflection while maintaining the transparency of the overall assembly. The diffusion layer acts as a buffer that transforms the reflected light into a viewable image.
Solution Approach 2:
The patent creates a composite structure combining the half-mirror, diffusion layer, and transparent panel materials. This composite assembly integrates the reflective property of the half-mirror with the diffusing property of the diffusion layer and the transparent property of the panel, achieving both image visibility and transparency simultaneously.
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 solution allows for effective image display at near distances with improved recognizability and reduced system volume by enhancing light diffusion and refracting properties, increasing the fill factor and intensity of projected images.
Implementation Method 1
a polarization plate, disposed on a rear surface of the transparent substrate and configured to convert a light incident to the polarization plate to a polarized light having a specific polarization direction
Implementation Method 2
a 1/4 wavelength plate, disposed on one side of the transparent diffusion plate and configured to convert a polarization direction of an incident light
Implementation Method 3
a transparent diffusion plate which is disposed on one side of the polarization plate and is configured to transmit light incident from a side of the polarization plate and to reflect and diffuse a light incident from an opposite side of the polarization plate
Implementation Method 4
a transparent diffusion plate which is disposed on one side of the polarization plate and is configured to transmit light incident from a side of the polarization plate and to reflect and diffuse a light incident from an opposite side of the polarization plate
Implementation Method 5
a lens array comprising a birefringent material having different refractive indexes according to a polarization direction of an incident light
Implementation Method 6
a lens array comprising a birefringent material having different refractive indexes according to a polarization direction of an incident light
Implementation Method 7
a refractive index alignment member configured to transmit or refract the light according to a polarization direction of a light that penetrates the lens array
Data Source
AI summary
A transparent panel is provided. The transparent panel includes a polarization plate, a transparent diffusion plate which is disposed on one side of the polarization plate and is configured to transmit light incident from a side of the polarization plate and to reflect and diffuse a light incident from an opposite side of the polarization plate, a ¼ wavelength plate which is disposed on one side of the transparent diffusion plate and is configured to convert a polarization direction of an incident light, and a lens part which is disposed on one side of the ¼ wavelength plate. The lens part includes a lens array comprising a birefringent material having different refractive indexes according to a polarization direction of an incident light, and a refractive index alignment member configured to transmit or refract the light according to a polarization direction of a light that penetrates the lens array.