26 June 2017 Aerial 3D display by use of a 3D-shaped screen with aerial imaging by retro-reflection (AIRR)
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Proceedings Volume 10335, Digital Optical Technologies 2017; 103351K (2017) https://doi.org/10.1117/12.2269494
Event: SPIE Digital Optical Technologies, 2017, Munich, Germany
Abstract
The purpose of this paper is to realize an aerial 3D display. We design optical system that employs a projector below a retro-reflector and a 3D-shaped screen. A floating 3D image is formed with aerial imaging by retro-reflection (AIRR). Our proposed system is composed of a 3D-shaped screen, a projector, a quarter-wave retarder, a retro-reflector, and a reflective polarizer. Because AIRR forms aerial images that are plane-symmetric of the light sources regarding the reflective polarizer, the shape of the 3D screen is inverted from a desired aerial 3D image. In order to expand viewing angle, the 3D-shaped screen is surrounded by a retro-reflector. In order to separate the aerial image from reflected lights on the retro- reflector surface, the retro-reflector is tilted by 30 degrees. A projector is located below the retro-reflector at the same height of the 3D-shaped screen. The optical axis of the projector is orthogonal to the 3D-shaped screen. Scattered light on the 3D-shaped screen forms the aerial 3D image. In order to demonstrate the proposed optical design, a corner-cube-shaped screen is used for the 3D-shaped screen. Thus, the aerial 3D image is a cube that is floating above the reflective polarizer. For example, an aerial green cube is formed by projecting a calculated image on the 3D-shaped screen. The green cube image is digitally inverted in depth by our developed software. Thus, we have succeeded in forming aerial 3D image with our designed optical system.
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Nao Kurokawa, Shusei Ito, Hirotsugu Yamamoto, "Aerial 3D display by use of a 3D-shaped screen with aerial imaging by retro-reflection (AIRR)", Proc. SPIE 10335, Digital Optical Technologies 2017, 103351K (26 June 2017); doi: 10.1117/12.2269494; https://doi.org/10.1117/12.2269494
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