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Proceedings Paper • Open Access

Design of crossed-mirror array to form floating 3D LED signs
Author(s): Hirotsugu Yamamoto; Hiroki Bando; Ryousuke Kujime; Shiro Suyama

Paper 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.

Paper Details

Date Published: 28 February 2012
PDF: 8 pages
Proc. SPIE 8288, Stereoscopic Displays and Applications XXIII, 828820 (28 February 2012); doi: 10.1117/12.909879
Show Author Affiliations
Hirotsugu Yamamoto, Univ. of Tokushima (Japan)
Japan Science and Technology Agency (Japan)
Hiroki Bando, Univ. of Tokushima (Japan)
Ryousuke Kujime, Univ. of Tokushima (Japan)
Shiro Suyama, Univ. of Tokushima (Japan)

Published in SPIE Proceedings Vol. 8288:
Stereoscopic Displays and Applications XXIII
Andrew J. Woods; Nicolas S. Holliman; Gregg E. Favalora, Editor(s)

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