Liquid crystal polymers and networks for display applications

D. J. Broer, J. A M M Van Haaren, J. Lub

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

7 Citations (Scopus)

Abstract

Photopolymerization of liquid-crystalline [LC] monomers produces polymer films with a spatial control over the molecular organization. A powerful tool for creating even more complex molecular architectures than by LC order alone is photo-induced diffusion during polymerization of these monomers. Photo-induced diffusion during polymerization of chiral-nematic monomers yields a cholesteric network in which the helical pitch gradually changes over the cross-section of the film. The polarization selective reflection band can thus be made much wider than those of single pitch materials and may expand the whole visible spectrum. Performing photo-induced diffusion on a length-scale of half the cholesteric pitch by using a liquid-crystalline photoinitiator yields a cholesteric network with a deformed helix. Helix deformation gives higher order reflections and a built-in optical retardation. When the deformed helix is combined with a pitch gradient over the film thickness, the built-in retardation can be used for wide-band cholesteric polarizers that directly generate linearly polarized light without an additional quarter-wave foil.

Original languageEnglish
Title of host publicationLiquid Crystals IV
EditorsIam-Choon Khoo
Place of PublicationBellingham
PublisherSPIE
Pages59-68
Number of pages10
DOIs
Publication statusPublished - 1 Dec 2000
EventLiquid Crystals IV - San Diego, CA, USA
Duration: 2 Aug 20003 Aug 2000

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume4107
ISSN (Print)0277-786X

Conference

ConferenceLiquid Crystals IV
CitySan Diego, CA, USA
Period2/08/003/08/00

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  • Cite this

    Broer, D. J., Van Haaren, J. A. M. M., & Lub, J. (2000). Liquid crystal polymers and networks for display applications. In I-C. Khoo (Ed.), Liquid Crystals IV (pp. 59-68). (Proceedings of SPIE; Vol. 4107). SPIE. https://doi.org/10.1117/12.405329