Vehicle Air-Floating Display Optics for Ghost-Free Visibility
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Solution Overview
Problem
Existing air floating video display apparatuses lack improvements in visual resolution and contrast, and their use in vehicles is hindered by issues such as ghost images and blurring, which degrade the visibility and quality of the displayed video.
Innovation Solution
The apparatus employs a configuration with a liquid crystal display panel, a light source, a polarization separation member, and a retroreflector with a λ/4 plate to convert polarized waves, ensuring high visibility by minimizing ghost images and blurring, and is designed for easy installation in vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional air floating video display is used, then basic video display function is achieved, but visual resolution and contrast are insufficient
Solution Approach 1:
A polarization separation member (beam splitter) is introduced as an intermediary optical element between the display panel and the air floating video formation path. This beam splitter separates polarized light from non-polarized light, allowing the display panel to emit light that forms high-resolution air floating videos while blocking stray light, thereby improving visual resolution and contrast without significantly increasing overall system complexity
Solution Approach 2:
The patent changes the polarization parameter of the light emitted from the display panel by introducing a λ/4 plate (quarter-wave plate) at the retroreflector. This converts the linearly polarized light from the display panel into circularly polarized light, which then undergoes polarization conversion during retroreflection, enhancing the contrast and resolution of the air floating video while maintaining system manageability
2Illumination intensity
If air floating video is displayed in vehicle interior, then driver information can be provided, but ghost images and blurring occur reducing visibility
Solution Approach 1:
The patent exploits the harmful effect of light reflection and polarization mixing that causes ghost images and blurring, and converts it into a beneficial feature. By strategically placing a polarization separation member and λ/4 plate, the system uses polarization optics to separate the desired video light path from the harmful reflected light paths. The beam splitter reflects polarized light from the display panel while transmitting non-polarized light, and the λ/4 plate converts polarization states to prevent ghost image formation, thereby transforming the problematic light interactions into a mechanism for high-visibility, ghost-image-free display
Solution Approach 2:
The polarization separation member acts as an intermediary that selectively reflects polarized light from the display panel while transmitting non-polarized light, creating a clean light path for air floating video formation. The λ/4 plate at the retroreflector serves as another intermediary that converts polarization states to prevent ghost images. These intermediary optical elements eliminate blurring and ghost images by managing light polarization throughout the optical path
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 provides an air floating video display with high visibility and improved resolution, suitable for vehicles, reducing ghost images and blurring, and enhancing the overall video quality.
Implementation Method 1
a polarization separation member arranged outside the second housing obliquely at a predetermined angle with respect to the video display apparatus... a video light of a specific polarized wave emitted from the liquid crystal display panel is reflected by the polarization separation member
Implementation Method 2
enters the retroreflector to be retroreflected
Implementation Method 3
passes through the λ/4 plate to be subjected to polarization conversion into a video light of the other polarized wave
Data Source
AI summary
A technique that is suitable for use in a vehicle and capable of displaying an air floating video with high visibility is provided. The present invention contributes to “Goal 3: Ensure healthy lives and promote well-being for all at all ages” and “Goal 9: Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation” in the sustainable development goals. The air floating video display apparatus includes a housing 106 which is attachable at a position near a ceiling or a rearview mirror in the vehicle and stores a video display apparatus 1. A polarization separation member 101 and a retroreflector 2 on which a λ/4 plate 21 is provided, which are each arranged at a predetermined angle, are provided outside the housing 106. A video light of a specific polarized wave from the video display apparatus 1 is reflected by the polarization separation member 101, is retroreflected by the retroreflector 2, and passes through the λ/4 plate 21 to be subjected to polarization conversion, and the video light after the polarization conversion passes through the polarization separation member 101 to display an air floating video 3 at a predetermined position.