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28 February 2012 Design of crossed-mirror array to form floating 3D LED signs
Hirotsugu Yamamoto, Hiroki Bando, Ryousuke Kujime, Shiro Suyama
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Proceedings Volume 8288, Stereoscopic Displays and Applications XXIII; 828820 (2012) https://doi.org/10.1117/12.909879
Event: IS&T/SPIE Electronic Imaging, 2012, Burlingame, California, United States
Abstract
3D representation of digital signage improves its significance and rapid notification of important points. Our goal is to realize floating 3D LED signs. The problem is there is no sufficient device to form floating 3D images from LEDs. LED lamp size is around 1 cm including wiring and substrates. Such large pitch increases display size and sometimes spoils image quality. The purpose of this paper is to develop optical device to meet the three requirements and to demonstrate floating 3D arrays of LEDs. We analytically investigate image formation by a crossed mirror structure with aerial aperture, called CMA (crossed-mirror array). CMA contains dihedral corner reflectors at each aperture. After double reflection, light rays emitted from an LED will converge into the corresponding image point. We have fabricated CMA for 3D array of LEDs. One CMA unit contains 20 x 20 apertures that are located diagonally. Floating image of LEDs was formed in wide range of incident angle. The image size of focused beam agreed to the apparent aperture size. When LEDs were located three-dimensionally (LEDs in three depths), the focused distances were the same as the distance between the real LED and the CMA.
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Hirotsugu Yamamoto, Hiroki Bando, Ryousuke Kujime, and Shiro Suyama "Design of crossed-mirror array to form floating 3D LED signs", Proc. SPIE 8288, Stereoscopic Displays and Applications XXIII, 828820 (28 February 2012); https://doi.org/10.1117/12.909879
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