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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 26914–26920

Enhanced contrast ratio and viewing angle of polymer-stabilized liquid crystal via refractive index matching between liquid crystal and polymer network

Ji-Hoon Lee, Jung Jin Lee, Young Jin Lim, Sudarshan Kundu, Shin-Woong Kang, and Seung Hee Lee  »View Author Affiliations


Optics Express, Vol. 21, Issue 22, pp. 26914-26920 (2013)
http://dx.doi.org/10.1364/OE.21.026914


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Abstract

Long standing electro-optic problems of a polymer-dispersed liquid crystal (PDLC) such as low contrast ratio and transmittances decrease in oblique viewing angle have been challenged with a mixture of dual frequency liquid crystal (DFLC) and reactive mesogen (RM). The DFLC and RM molecules were vertically aligned and then photo-polymerized using a UV light. At scattering state under 50 kHz electric field, DFLC was switched to planar state, giving greater extraordinary refractive index than the normal PDLC cell. Consequently, the scattering intensity and the contrast ratio were increased compared to the conventional PDLC cell. At transparent state under 1 kHz electric field, the extraordinary refractive index of DFLC was simultaneously matched with the refractive index of vertically aligned RM so that the light scattering in oblique viewing angles was minimized, giving rise to high transmittance in all viewing angles.

© 2013 Optical Society of America

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

History
Original Manuscript: September 12, 2013
Revised Manuscript: October 21, 2013
Manuscript Accepted: October 21, 2013
Published: October 30, 2013

Citation
Ji-Hoon Lee, Jung Jin Lee, Young Jin Lim, Sudarshan Kundu, Shin-Woong Kang, and Seung Hee Lee, "Enhanced contrast ratio and viewing angle of polymer-stabilized liquid crystal via refractive index matching between liquid crystal and polymer network," Opt. Express 21, 26914-26920 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-22-26914


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