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Proceedings Paper

Bimesogenic liquid crystals: new materials for high-performance photonics devices and displays
Author(s): Harry J. Coles
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Paper Abstract

We describe wide temperature range new bimesogenic nematic liquid crystals with high flexoelectro-optic coefficients (e/K),of the order of 1.5- 2.0 CN-1 m-1, high switching angles, > 100° and microsecond response times which may be used to give gray scale devices in both the ULH texture, with an optimum optical in plane switch of 45° at fields of 4V&mgr;m-1 or less, and in the USH or Grandjean texture (with a unique optically isotropic "field off" black state and contrast ratios of > 1000:1), using "in plane" electric fields, with switching times of the order of 20&mgr;s. The new materials and devices give &mgr;s level to level switching and the real potential for colour filter free frame sequential colour switching. New highly reflective Blue Phase devices, stable over a 50°C temperature range, in which an electric field is used to switch the reflection from red to green, for example, will be described. Full RGB reflections may be obtained with switching times of a few milliseconds. Finally we will briefly mention potential applications including high efficiency RGB liquid crystal laser sources.

Paper Details

Date Published: 9 February 2007
PDF: 8 pages
Proc. SPIE 6487, Emerging Liquid Crystal Technologies II, 64870M (9 February 2007); doi: 10.1117/12.721154
Show Author Affiliations
Harry J. Coles, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 6487:
Emerging Liquid Crystal Technologies II
Liang-Chy Chien, Editor(s)

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