Air Floating Video Display Using Polarization Control
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Solution Overview
Problem
Existing air floating video display apparatuses fail to effectively display air floating videos as three-dimensional shapes, leading to issues like ghost images and blurred pixels due to the geometry of retroreflectors and wide-angle video light diffusion.
Innovation Solution
Incorporating a polarization separator and a retroreflector with a λ/4 plate, arranged at specific angles to control polarization conversion and reduce ghost images, while using a narrow divergence angle light source to improve image quality and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a retroreflector is used to form air floating videos, then the videos can be displayed in air, but ghost images and blurred pixels occur due to the geometry of retroreflectors and wide-angle video light diffusion
Solution Approach 1:
The patent changes the polarization state parameter of video light by introducing a λ/4 plate and polarization separator. The linearly polarized light from the display panel is converted to circularly polarized light by the λ/4 plate, then separated by the polarization separator to create the air floating video. This parameter change enables precise control of light direction and reduces ghost images while maintaining wide viewing angles.
Solution Approach 2:
The patent introduces a polarization separator as an intermediary component between the display panel and retroreflector. This mediator selectively transmits or reflects light based on polarization state, enabling precise control of light paths to form the air floating video while preventing ghost images and pixel blur.
2Manufacturing precision
If a polarization separator and λ/4 plate are added to control polarization conversion, then ghost images are reduced and resolution is improved, but device complexity increases
Solution Approach 1:
The patent segments the optical system into distinct functional layers: display panel, λ/4 plate, polarization separator, and retroreflector. Each layer performs a specific function in the polarization control chain, allowing independent optimization and simplifying the overall design despite multiple components.
Solution Approach 2:
The polarization separator serves multiple functions: it separates polarized light to create the air floating video, controls the viewing angle, and prevents ghost images. This multi-functionality reduces the need for additional components, offsetting the complexity increase from adding polarization control elements.
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 enables stereoscopically visible air floating videos with improved resolution and reduced ghost images, enhancing the overall display quality and user experience.
Implementation Method 1
a polarization separator arranged between the display panel and the retroreflector at a predetermined angle with respect to the display panel
Implementation Method 2
a retroreflector that reflects the video light from the display panel and forms an air floating video in air by the reflected light
Implementation Method 3
In addition, a λ/4 plate (retardation plate) is provided on a retroreflection surface of the retroreflector
Data Source
AI summary
An air floating video display apparatus includes a display panel that displays a video, a retroreflector that reflects the video light from the display panel and forms an air floating video in air by the reflected light, and a polarization separator arranged between the display panel and the retroreflector at a predetermined angle with respect to the display panel, and the retroreflector is arranged to face the display panel obliquely at a predetermined angle.