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Proceedings Paper

Micromachined edge illuminated optically transparent automotive light guide panels
Author(s): Rahima Afrose Ronny; George K. Knopf; Evgueni Bordatchev; Mohammed Tauhiduzzaman; Suwas Nikumb
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Paper Abstract

Edge-lit backlighting has been used extensively for a variety of small and medium-sized liquid crystal displays (LCDs). The shape, density and spatial distribution pattern of the micro-optical elements imprinted on the surface of the flat light-guide panel (LGP) are often "optimized" to improve the overall brightness and luminance uniformity. A similar concept can be used to develop interior convenience lighting panels and exterior tail lamps for automotive applications. However, costly diffusive sheeting and brightness enhancement films are not be considered for these applications because absolute luminance uniformity and the minimization of Moiré fringe effects are not significant factors in assessing quality of automotive lighting. A new design concept that involves micromilling cylindrical micro-optical elements on optically transparent plastic substrates is described in this paper. The variable parameter that controls illumination over the active regions of the panel is the depth of the individual cylindrical micro-optical elements. LightTools™ is the optical simulation tool used to explore how changing the micro-optical element depth can alter the local and global luminance. Numerical simulation and microfabrication experiments are performed on several (100mmx100mmx6mm) polymethylmethacrylate (PMMA) test samples in order to verify the illumination behavior.

Paper Details

Date Published: 6 February 2012
PDF: 11 pages
Proc. SPIE 8248, Micromachining and Microfabrication Process Technology XVII, 824806 (6 February 2012); doi: 10.1117/12.908202
Show Author Affiliations
Rahima Afrose Ronny, The Univ. of Western Ontario (Canada)
George K. Knopf, The Univ. of Western Ontario (Canada)
Evgueni Bordatchev, National Research Council Canada (Canada)
Mohammed Tauhiduzzaman, National Research Council Canada (Canada)
Suwas Nikumb, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 8248:
Micromachining and Microfabrication Process Technology XVII
Mary Ann Maher; Paul J. Resnick, Editor(s)

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