Air-Floating Video Display Polarization Layout for Private Viewing
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Solution Overview
Problem
Existing air floating video display apparatuses do not adequately address the issues of visual resolution, contrast, and visibility, particularly in indoor settings where the video light emitted from the display is visible to individuals other than the intended user.
Innovation Solution
The apparatus incorporates a retroreflector with a 1/4 plate and a polarization separation member to convert P-polarized video light into S-polarized light, reducing the visibility of reflected light to individuals on the opposite side of the user, while maintaining high visibility for the intended viewer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If video light is emitted from the video display apparatus to form an air floating video, then the video visibility is improved, but the video light becomes visible to persons on the opposite side of the user's eyes
Solution Approach 1:
The patent changes the polarization state of video light by introducing a 1/4 plate that converts P-polarized light from the display panel into S-polarized light after retroreflection. This parameter change in polarization state enables the video light to be invisible to persons on the opposite side while maintaining visibility for the user, resolving the technical contradiction between video visibility and preventing opposite-side visibility.
Solution Approach 2:
The patent introduces a polarization separation member as an intermediary component between the video display apparatus and the retroreflector. This intermediary selectively transmits S-polarized video light to form the air floating video while blocking P-polarized light from reaching persons on the opposite side, thus solving the contradiction by mediating the light transmission based on polarization state.
2Ease of operation
If a retroreflector is used to display the air floating video, then the video can be displayed floating in the air, but the visual resolution and contrast are insufficient
Solution Approach 1:
The patent improves visual resolution and contrast by changing the polarization parameter of video light through the 1/4 plate. This enables better control of light transmission and reflection, resulting in sharper images and higher contrast for the air floating video while maintaining the floating display capability.
3Productivity
If P-polarized video light passes through the polarization separation member, then the video light can be reflected by the retroreflector, but reflected video light is visible to persons on the opposite side
Solution Approach 1:
The patent changes the polarization parameter of video light from P-polarized to S-polarized using the 1/4 plate before retroreflection. This parameter change ensures that the reflected light is S-polarized and can be selectively transmitted by the polarization separation member to the user while being blocked from persons on the opposite side, thus maintaining reflection efficiency while eliminating unwanted visibility.
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 makes the video light invisible to individuals on the opposite side of the user, enhances indoor visibility, and maintains high video quality with reduced ghost images and improved contrast.
Implementation Method 1
a 1/4 plate (retardation plate, quarter-wave plate) provided on a retroreflection surface... passes through the λ/4 plate twice to be subjected to polarization conversion into a video light of S-polarization
Implementation Method 2
a retroreflector arranged so as to face a video display apparatus... is reflected by the retroreflector
Implementation Method 3
a polarization separation member arranged at a predetermined angle with respect to the video display apparatus and the retroreflector... the S-polarized video light reflected by the retroreflector is reflected by the polarization separation member
Data Source
AI summary
An air floating video display apparatus configured to display an air floating video, including a housing configured to store a video display apparatus, a retroreflector arranged outside the housing so as to face the video display apparatus and having a λ/4 plate provided on a retroreflection surface, and a polarization separation member arranged in a space connecting the video display apparatus and the retroreflector outside the housing, the video display apparatus including a light source apparatus and a liquid crystal display panel as a video source, and a video light of a specific polarized wave entering the polarization separation member, passing through the polarization separation member, being reflected by the retroreflector, and passing through the λ/4 plate, the video light of the other polarized wave being reflected by the polarization separation member, and the air floating video being displayed.