Alignment of cholesteric liquid crystals using the macroscopic flexoelectric polarization contribution to dielectric properties

Alignment of cholesteric liquid crystals using the macroscopic flexoelectric polarization contribution to dielectric properties

By considering the contribution of flexoelectricity to a cholesteric liquid crystal's dielectric permittivity, we show that both flexoelectric and dielectric effects allow the alignment of the Uniform Lying Helix (ULH) in devices with in-plane-switching (IPS) electrodes. The non-uniformity of f...

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Veröffentlicht in:Applied physics letters 2013-09, Vol.103 (14)
Hauptverfasser: Outram, B. I., Elston, S. J.
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description By considering the contribution of flexoelectricity to a cholesteric liquid crystal's dielectric permittivity, we show that both flexoelectric and dielectric effects allow the alignment of the Uniform Lying Helix (ULH) in devices with in-plane-switching (IPS) electrodes. The non-uniformity of fields produced by IPS electrodes is found to be crucial to allow ULH formation. The ULH is stabilised using homeotropic alignment conditions without polymer networks. Thus, a framework has been developed and tested for aligning and making stable cholesteric liquid crystals that incorporates both flexoelectric and dielectric field effects. Applications include bistable and ultra-fast display technology.
doi_str_mv 10.1063/1.4824034
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title Alignment of cholesteric liquid crystals using the macroscopic flexoelectric polarization contribution to dielectric properties
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