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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 14 — May. 10, 2008
  • pp: 2623–2629

Wide view supertwisted nematic liquid-crystal light shutter

Andrej Vrečko, Janez Pirš, Matej Bažec, and Dušan Ponikvar  »View Author Affiliations


Applied Optics, Vol. 47, Issue 14, pp. 2623-2629 (2008)


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Abstract

We present a novel concept of a wide viewing angle liquid-crystal display (LCD) light shutter, taking advantage of the highly symmetric 180 ° -twisted liquid-crystal (LC) configuration and the light propagation starting with a single mode. In a specific case of the high voltage driven LCD light shutter, the resulting very high overall symmetry allows for the efficient angular compensation of the light attenuation in the optically closed state using just a simple, specifically tuned, negative-birefringent c-plate retarder. The latter can be adapted to compensate for the positive optical birefringence of the homeotropically aligned LC molecules as well as also for a great deal of the angular dependence of the crossed polarizers. We show that the additional partial compensation of the angular dependence of the crossed polarizers can be explained by a combined effect of the positive birefringence of the homeotropically aligned LC molecules, negative-birefringence c-plate retarder, and an in-plane residual positive birefringence (a-plate) of the boundary layers of the LC molecules.

© 2008 Optical Society of America

OCIS Codes
(230.3720) Optical devices : Liquid-crystal devices
(250.4110) Optoelectronics : Modulators

ToC Category:
Optical Devices

History
Original Manuscript: November 7, 2007
Revised Manuscript: February 6, 2008
Manuscript Accepted: February 11, 2008
Published: May 6, 2008

Citation
, "Wide view supertwisted nematic liquid-crystal light shutter," Appl. Opt. 47, 2623-2629 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-14-2623

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