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Proceedings Paper

Aerial secure display by use of polarization-processing display with retarder film and retro-reflector
Author(s): Shusei Ito; Keitaro Uchida; Haruki Mizushina; Shiro Suyama; Hirotsugu Yamamoto
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Paper Abstract

Security is one of the big issues in automated teller machine (ATM). In ATM, two types of security have to be maintained. One is to secure displayed information. The other is to secure screen contamination. This paper gives a solution for these two security issues. In order to secure information against peeping at the screen, we utilize visual cryptography for displayed information and limit the viewing zone. Furthermore, an aerial information screen with aerial imaging by retro-reflection, named AIRR enables users to avoid direct touch on the information screen. The purpose of this paper is to propose an aerial secure display technique that ensures security of displayed information as well as security against contamination problem on screen touch. We have developed a polarization-processing display that is composed of a backlight, a polarizer, a background LCD panel, a gap, a half-wave retarder, and a foreground LCD panel. Polarization angle is rotated with the LCD panels. We have constructed a polarization encryption code set. Size of displayed images are designed to limit the viewing position. Furthermore, this polarization-processing display has been introduced into our aerial imaging optics, which employs a reflective polarizer and a retro-reflector covered with a quarter-wave retarder. Polarization-modulated light forms the real image over the reflective polarizer. We have successfully formed aerial information screen that shows the secret image with a limited viewing position. This is the first realization of aerial secure display by use of polarization-processing display with retarder-film and retro-reflector.

Paper Details

Date Published: 16 February 2017
PDF: 6 pages
Proc. SPIE 10126, Advances in Display Technologies VII, 101260O (16 February 2017); doi: 10.1117/12.2251789
Show Author Affiliations
Shusei Ito, Utsunomiya Univ. (Japan)
Keitaro Uchida, Utsunomiya Univ. (Japan)
Haruki Mizushina, The Univ. of Tokushima (Japan)
Shiro Suyama, The Univ. of Tokushima (Japan)
Hirotsugu Yamamoto, Utsunomiya Univ. (Japan)


Published in SPIE Proceedings Vol. 10126:
Advances in Display Technologies VII
Liang-Chy Chien; Tae-Hoon Yoon; Sin-Doo Lee, Editor(s)

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