A Simple Method To Measure The Twist Elastic Constant Of A Nematic Liquid Crystal

Keywords

fringe field switching; liquid crystal display; twist elastic constant

Abstract

We demonstrate a simple method for measuring the twist elastic constant (K22) of a nematic liquid crystal (LC). By adding some chiral dopant to an LC host, the LC directors rotate 180° in a homogeneous cell, which is known as 180° super-twisted nematic (STN) cell. By preparing two such STN cells with different chiral concentrations and measuring their Fréedericksz threshold voltages, we can obtain the K22 and helical twisting power simultaneously. In the whole process, there is no need to measure the pitch length. Our obtained K22 values agree well with those reported by using other methods.

Publication Date

12-2-2015

Publication Title

Liquid Crystals

Volume

42

Issue

12

Number of Pages

1738-1742

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/02678292.2015.1070925

Socpus ID

84948711409 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84948711409

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