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Variable liquid crystal pretilt angles generated by photoalignment in homeotropically aligned azo dye-doped liquid crystals

Appl. Phys. Lett. 95, 161104 (2009); doi:10.1063/1.3253413

Published 21 October 2009

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Andy Ying-Guey Fuh,1,2,3 Cheng-Kai Liu,1 Ko-Ting Cheng,1 Chi-Lung Ting,2 Che-Chang Chen,2 Paul Chang-Po Chao,4 and Hsu-Kuan Hsu5
1Department of Physics, National Cheng Kung University, Tainan 701, Taiwan
2Institute of Electro-optical Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan
3Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan
4Department of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
5Chi-Mei Optoelectronics Corporation, Tainan 741, Taiwan
This letter demonstrates the feasibility of producing variable liquid crystal (LC) pretilt angles using light-induced ripple structures (LIRSs) in homeotropically aligned azo dye-doped liquid crystals (ADDLCs). Illuminating homeotropically aligned ADDLCs with a linearly polarized light for a suitable period yields the LIRSs which provide LCs an anisotropic homogeneous anchoring force. Experimentally, the effective alignment force produced by the homeotropic alignment layer and the LIRSs determines the LC pretilt angle (24° to 63.5°), defined from the normal to the substrate. A no-bias pi cell for liquid crystal displays is demonstrated using this approach. ©2009 American Institute of Physics
History: Received 1 July 2009; accepted 30 September 2009; published 21 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/161104/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.30.Gd
    Orientational order of liquid crystals in electric and magnetic fields
  • 61.30.Hn
    Surface phenomena in liquid crystals
  • 85.60.Pg
    Optoelectronic display systems
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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