Extracting the physical optical parameters of TNLC cell using effective parameters and stokes polarimetry method

Yu-Lung Lo, Tsung Tse Yang, Chia Chi Liao

Research output: Contribution to journalArticle

Abstract

A method is proposed for determining the cell gap, twist angle and pretilt angle of twisted nematic liquid crystal (TNLC) cells. In the proposed approach, the effective optical parameters of the TNLC cells are measured using a Stokes polarimetry method and the physical optical parameters are then extracted from these effective parameters using a simple analytical technique. The experimental results for the TNLC cell show that the extracted values of the twist angle, pretilt angle and cell gap are Φ=89.864° ± 0.028°, ξ=1.806°± 0.050° and d=10.696 μm\± 0.025 μm, respectively. The experimental results for the twist angle and cell gap deviate from the known values by just ΔΦ=0.136° and Δd=0.196 μm, respectively. Moreover, the pretilt angle is found to lie in the reliable range. In contrast to existing methods, the technique proposed in this study requires the use of only a single illuminating wavelength. As a result, it provides a cheaper and more straightforward approach for extracting the three physical parameters of TNLC cells than existing optical-parameter measurement schemes.

Original languageEnglish
Article number6722916
Pages (from-to)478-483
Number of pages6
JournalJournal of Display Technology
Volume10
Issue number6
DOIs
Publication statusPublished - 2014 Jun 1

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Polarimeters
Nematic liquid crystals
polarimetry
liquid crystals
cells
Wavelength
illuminating
wavelengths

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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title = "Extracting the physical optical parameters of TNLC cell using effective parameters and stokes polarimetry method",
abstract = "A method is proposed for determining the cell gap, twist angle and pretilt angle of twisted nematic liquid crystal (TNLC) cells. In the proposed approach, the effective optical parameters of the TNLC cells are measured using a Stokes polarimetry method and the physical optical parameters are then extracted from these effective parameters using a simple analytical technique. The experimental results for the TNLC cell show that the extracted values of the twist angle, pretilt angle and cell gap are Φ=89.864° ± 0.028°, ξ=1.806°± 0.050° and d=10.696 μm\± 0.025 μm, respectively. The experimental results for the twist angle and cell gap deviate from the known values by just ΔΦ=0.136° and Δd=0.196 μm, respectively. Moreover, the pretilt angle is found to lie in the reliable range. In contrast to existing methods, the technique proposed in this study requires the use of only a single illuminating wavelength. As a result, it provides a cheaper and more straightforward approach for extracting the three physical parameters of TNLC cells than existing optical-parameter measurement schemes.",
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Extracting the physical optical parameters of TNLC cell using effective parameters and stokes polarimetry method. / Lo, Yu-Lung; Yang, Tsung Tse; Liao, Chia Chi.

In: Journal of Display Technology, Vol. 10, No. 6, 6722916, 01.06.2014, p. 478-483.

Research output: Contribution to journalArticle

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