24 October 2000 Liquid crystal polymers and networks for display applications
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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.
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Dick J. Broer, Dick J. Broer, Jos A.M.M. Van Haaren, Jos A.M.M. Van Haaren, Johan Lub, Johan Lub, } "Liquid crystal polymers and networks for display applications", Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); doi: 10.1117/12.405329; https://doi.org/10.1117/12.405329
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