Ionic effects on electro-optics and residual direct current voltages of twisted nematic liquid crystal cells

Po An Chen; Kei-Hsiung Yang

doi:10.1080/02678292.2017.1404154

Ionic effects on electro-optics and residual direct current voltages of twisted nematic liquid crystal cells

Po An Chen, Kei-Hsiung Yang

Institute of Imaging and Biomedical Photonics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

By using electro-optical and dielectric absorption [1-4] measurements, we report our investigations of ionic effects on electro-optics and residual direct current voltages (VrDCs) of two polyimide (PI)-aligned twisted nematic (TN) cells with same liquid crystal mixture but different PI-alignment materials. We have also carried out new experimental methods to find out that the observed VrDCs were caused by LC-PI-interfacial trapped ions generated and transported from the LC medium for one TN cell, and from the PI layers for the other TN cell. Our measured VrDCs indicated that the former had two different exponential-decay rates similar to the published results by M. Mizusaki et al. [2] but the latter had only a single exponential-decay rate.

Original language	English
Pages (from-to)	1032-1039
Number of pages	8
Journal	Liquid Crystals
Volume	45
Issue number	7
DOIs	https://doi.org/10.1080/02678292.2017.1404154
State	Published - 2018

Keywords

Liquid crystal; electro-optics of TN liquid crystal; ions in nematic liquid crystal; ions in polyimide film

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title = "Ionic effects on electro-optics and residual direct current voltages of twisted nematic liquid crystal cells",

abstract = "By using electro-optical and dielectric absorption [1-4] measurements, we report our investigations of ionic effects on electro-optics and residual direct current voltages (VrDCs) of two polyimide (PI)-aligned twisted nematic (TN) cells with same liquid crystal mixture but different PI-alignment materials. We have also carried out new experimental methods to find out that the observed VrDCs were caused by LC-PI-interfacial trapped ions generated and transported from the LC medium for one TN cell, and from the PI layers for the other TN cell. Our measured VrDCs indicated that the former had two different exponential-decay rates similar to the published results by M. Mizusaki et al. [2] but the latter had only a single exponential-decay rate.",

keywords = "Liquid crystal; electro-optics of TN liquid crystal; ions in nematic liquid crystal; ions in polyimide film",

author = "Chen, {Po An} and Kei-Hsiung Yang",

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language = "English",

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pages = "1032--1039",

journal = "Liquid Crystals",

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T1 - Ionic effects on electro-optics and residual direct current voltages of twisted nematic liquid crystal cells

AU - Chen, Po An

AU - Yang, Kei-Hsiung

PY - 2018

Y1 - 2018

N2 - By using electro-optical and dielectric absorption [1-4] measurements, we report our investigations of ionic effects on electro-optics and residual direct current voltages (VrDCs) of two polyimide (PI)-aligned twisted nematic (TN) cells with same liquid crystal mixture but different PI-alignment materials. We have also carried out new experimental methods to find out that the observed VrDCs were caused by LC-PI-interfacial trapped ions generated and transported from the LC medium for one TN cell, and from the PI layers for the other TN cell. Our measured VrDCs indicated that the former had two different exponential-decay rates similar to the published results by M. Mizusaki et al. [2] but the latter had only a single exponential-decay rate.

AB - By using electro-optical and dielectric absorption [1-4] measurements, we report our investigations of ionic effects on electro-optics and residual direct current voltages (VrDCs) of two polyimide (PI)-aligned twisted nematic (TN) cells with same liquid crystal mixture but different PI-alignment materials. We have also carried out new experimental methods to find out that the observed VrDCs were caused by LC-PI-interfacial trapped ions generated and transported from the LC medium for one TN cell, and from the PI layers for the other TN cell. Our measured VrDCs indicated that the former had two different exponential-decay rates similar to the published results by M. Mizusaki et al. [2] but the latter had only a single exponential-decay rate.

KW - Liquid crystal; electro-optics of TN liquid crystal; ions in nematic liquid crystal; ions in polyimide film

U2 - 10.1080/02678292.2017.1404154

DO - 10.1080/02678292.2017.1404154

M3 - Article

VL - 45

SP - 1032

EP - 1039

JO - Liquid Crystals

JF - Liquid Crystals

SN - 0267-8292

IS - 7

ER -