Highly birefringent nematic liquid crystals for reflective STN applications

Article abstract of DOI:10.1080/10587250108025063

An important parameter of any LCD containing portable electronic device is a low power requirement. The reflective STN display mode offers a moderate to high information content display with low power consumption. One method to realise colour in this mode is to use a large retardation (dΔn) value in the cell. For a cell gap of 6 μm, and a retardation of ～1.5, a birefringence (Δn) of greater than +0.2 is necessary. To achieve such a value in an STN LC mixture, materials with broad nematic range, good solubility and a Δn value of <+0.25 are required. A study of the trans-cyclohexyldifluorophenyltolane core structure was made and a large number of dialkyl, alkenyl-alkyl and alkoxy materials were synthesised and characterised. These materials possess low to moderate melting points, broad purely nematic mesophases, a high An and very good solubility in nematic LC hosts. They are suitable materials for inclusion in mixtures for colour reflective STN displays.

Full text of DOI:10.1080/10587250108025063

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Molecular Crystals and
Liquid Crystals Science
and Technology. Section A.
Molecular Crystals and Liquid
Crystals
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Highly Birefringent Nematic
Liquid Crystals for Reflective
STN Applications
Mark Goulding a , Volker Reiffenrath b & Harald
Hirschmann b
a Merck NB-SC, UK, University of Southampton ,
Highfield, Southampton, SO17-1BJ, UK
b Merck KGaA, Liquid Crystals Division , 64271,
Darmstadt, Germany
Published online: 24 Sep 2006.
To cite this article: Mark Goulding , Volker Reiffenrath & Harald Hirschmann (2001)
Highly Birefringent Nematic Liquid Crystals for Reflective STN Applications, Molecular
Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and
Liquid Crystals, 364:1, 899-910, DOI: 10.1080/10587250108025063
To link to this article: http://dx.doi.org/10.1080/10587250108025063
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