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Proceedings Paper

Subwavelength volume holographic grating in photopolymer for the liquid crystal display viewing angle compensation
Author(s): Mane-Si Laure Lee; Anne Delboulbé; Gérard Gomez; Eric Criton; Brigitte Loiseaux; Jean-Claude Lehureau; Jean-Pierre Huignard
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Paper Abstract

With today’s organic photopolymer materials allowing high resolution, it is possible to record subwavelength volume holographic index gratings, i.e. index gratings with a period much smaller than the wavelength operating in the form birefringence regime. Such components are of interest for the direct view liquid crystal displays that suffer from a narrow viewing angle. In fact, by providing high birefringence, they compensate the intrinsic birefringence of the liquid crystal and thus, improve the viewing angle properties of the liquid crystal displays. Recently, we introduced a hybrid holographic compensator combining an “in plane” commercially available birefringent film and a slanted optical-axis subwavelength volume index grating recorded in a DuPont photopolymer. In this paper, we present the hybrid holographic compensation and its interesting features for TN-LCD viewing angle improvement. More particularly, a hybrid holographic compensator is designed for avionics application. It is based on a 120nm-period volume index gratings achieving an index modulation of 0.045 with a 33°-slant angle of the optical axis. The hybrid holographic compensator was manufactured and implemented on an avionics equipment from Thales Avionics. Visual inspection as well as contrast measurements showed a good improvement of the viewing angle characteristics.

Paper Details

Date Published: 8 December 2003
PDF: 8 pages
Proc. SPIE 5216, Organic Holographic Materials and Applications, (8 December 2003); doi: 10.1117/12.508797
Show Author Affiliations
Mane-Si Laure Lee, Thales Research & Technology (France)
Anne Delboulbé, Thales Research & Technology (France)
Gérard Gomez, Thales Avionics LCD (France)
Eric Criton, Thales Avionics LCD (France)
Brigitte Loiseaux, Thales Research & Technology (France)
Jean-Claude Lehureau, Thales Research & Technology (France)
Jean-Pierre Huignard, Thales Research & Technology (France)

Published in SPIE Proceedings Vol. 5216:
Organic Holographic Materials and Applications
Klaus Meerholz, Editor(s)

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