@inproceedings{8fa2a7597d104d45a34ac7c986d7cd45,
title = "Collimated backlight for displays and microprojectors",
abstract = "A backlight illuminator with low divergence angle will significantly improve the efficiency, contrast and color gamut of liquid-crystal displays (LCDs) and micro-projectors. However, converting light from a light-emitting diode (LED) with large angle of divergence into a low-angle of divergence beam using a device that is only a few mm thick is extremely challenging task. Here, we propose a novel solution to this problem by using an optimized light-guide collimator and a quasi-diffractive-optical element. The idea is to illuminate the screen with LED through a parabolic waveguide/funnel that converts a point source into a collimated beam with relatively small diameter. The collimated beam at the output of the parabolic collimator is aligned at an angle to a prismatic quassi diffractive optical element (DOE) fabricated on top of a piece of glass. The illumination at an angle increases the size of the illuminating spot and the goal of the DOE is to correct the propagation direction of the illuminating beam. The proposed concept is demonstrated via preliminary numerical and experimental results.",
keywords = "Back light, Displays, Micro projectors",
author = "Rajesh Menon and Arkady Rudnitsky and Zeev Zalevsky",
note = "Publisher Copyright: {\textcopyright} Copyright 2015 IEEE All rights reserved.; 2014 28th IEEE Convention of Electrical and Electronics Engineers in Israel, IEEEI 2014 ; Conference date: 03-12-2014 Through 05-12-2014",
year = "2014",
doi = "10.1109/eeei.2014.7005792",
language = "الإنجليزيّة",
series = "2014 IEEE 28th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2014",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2014 IEEE 28th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2014",
address = "الولايات المتّحدة",
}