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Structure-performance relation of liquid crystal photoalignment with in-situ formation of protection layers

Published online by Cambridge University Press:  16 June 2016

Kai-Han Chang  and
Liang-Chy Chien
Kai-Han Chang*
Affiliation:
Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH 44242, U. S. A.
Liang-Chy Chien
Affiliation:
Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH 44242, U. S. A.
*
*(Email: [email protected])
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Abstract

We demonstrate a stabilized liquid crystal photoalignment using a surface-localized polymer method. A protection layer is developed on a photoalignment layer (PAL) through phase separation of a mixture composed of reactive monomers (RMs) and liquid crystals (LCs). The RM is polymerized on the PAL which enhances its stability against heat and light with short wavelength. The effects of the concentration and molecular structure of RMs on the electro-optical response and surface anchoring of photoaligned LC device are studied. The concentration of RMs affects the effective cell gap of the LC device. The rigid core length of the RM structure modulates the surface anchoring strength of the alignment layer. Both effective cell gap and surface anchoring strength are key elements for the enhanced dynamic response of LC devices.

Keywords

liquid crystaldisplaypolymerization
Type
Articles
Information
MRS Advances , Volume 1 , Issue 52: Soft Materials and Biomaterials , 2016 , pp. 3517 - 3523
Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Berreman, D. W., “Solid surface shape and the alignment of an adjacent nematic liquid crystal,” Phys. Rev. Lett. 28, 1683 (1972)Google Scholar
Gibbons, W. M., Shannon, P. J., Sun, S. –T., and Swetlin, B. J.,” Surface-mediated alignment of nematic liquid crystals with polarized laser light,” Nature 351, 49 (1991)Google Scholar
Chaudhari, P., Lacey, J. A., Lien, S. –C. A., and Speidell, J. L., “Atomic beam alignment of liquid cystal,” Jpn. J. Appl. Phys. 37, L55(1998)CrossRefGoogle Scholar
Kagajyo, T., Fujibayashi, K., Shimamura, T., Okada, H., and Onnagawa, H., “Alignment of nematic liquid crystal molecules using nanometer-sized ultrafine patterns by electron beam exposure method,” Jpn. J. Appl. Phys. 44, 578(2005)CrossRefGoogle Scholar
Armitage, D., “Alignment of liquid crystals on obliquely evaporated silicon oxide films,” J. Appl. Phys. 51, 2552 (1980)Google Scholar
Hwang, J. –Y. and Chien, L. –C., “Liquid crystal alignment on inkjet printed and air-buffed polyimide with nano-grove surface,” J. Phys. D: Appl. Phys. 42, 055305 (2009)Google Scholar
Yaroshchuk, O., Kyrychenko, V., Tao, D., Chigrinov, V., Kwok, H. S., Hasebe, H., and Takatsu, H., “Stabilization of liquid crystal photoaligning layers by reactive mesogens,” Appl. Phys. Lett. 95, 021902 (2009)Google Scholar
Finnemeyer, V., Bryant, D., and Bos, P. J., “Reactive mesogen stabilized azo dye alignment for high contrast displays,” SID Symposium Digest of Technical Papers 46, 991 (2015)Google Scholar
Yaroshchuck, O., Cada, L. G., Sonpatki, M., and Chien, L. –C., “Liquid crystal photoalignment using low-molecular-weight photo-cross-linkable composites,” Appl. Phys. Lett. 79, 30 (2001)CrossRefGoogle Scholar
Lu, L., Sergan, T., Sergan, V., and Bos, P. J., “Spatial and orientational control of liquid crystal alignment using a surface localized polymer layer,” Appl. Phys. Lett. 101, 251912 (2012)Google Scholar
Kang, S. W., Sprunt, S., and Chien, L. –C., “Photoinduced Localization of Orientationally Ordered Polymer Networks at the Surface of a Liquid Crystal Host,” Macromolecules 35, 9372 (2002)Google Scholar
Weng, L., Liao, P. –C., and Chien, L. –C., “Fast-Switching Vertical Alignment Liquid Crystal Displays Driven by Surface Polymer Stabilization,” Mol. Cryst. Liq. Cryst. 595, 106 (2014)Google Scholar
Kim, S. H., Shi, L., and Chien, L. –C., “Fast flexoelectric switching in a cholesteric liquid crystal cell with surface-localized polymer network,” J. Phys. D: Appl. Phys. 42, 195102 (2009)Google Scholar
Nie, X., Lu, R., Xianyu, H., Wu, T., and Wu, S. –T., “Anchoring energy and cell gap effect on liquid crystal response time,” J. Appl. Phys. 95, 5502(2004)Google Scholar
Blinov, L. M. et al. ,Electrooptic Effects in Liquid Crystal Materials, Springer-Verlag, (1994), P143–144 Google Scholar