A Simple Method to Measure Pretilt Angles of Inverse Twisted Nematic Liquid Crystal Cells

Sheng Yan Wang, Chia Yi Lin, Kei-Hsiung Yang

Research output: Contribution to journalArticle

Abstract

We have developed a simple optical method based on measurements of phase retardation[1] versus out-of-plane cell rotation angle and data analyzed by extended Jones matrix method to obtain pretilt angles of inverse twisted nematic (ITN) and tilted homeotropic liquid crystal (LC) cells. In our Jones-matrix calculations, we have assumed a constant pretilt angle as the LC-director tilt angles throughout the ITN cell as well as the tilted homeotropic cell. We have compared the measured pretilt angles of the ITN cell with those of an accompanying tilted homeotropic (ATH) cell. The results showed increasing discrepancies between them with increasing rubbing depth for LC alignments. However, these discrepancies could be explained by assuming that the surface-LC tilt angle of the ITN cell was equal to the measured pretilt angle of the ATH cell to generate a convex-type LC-director-deformation profile within the ITN cell based on Oseen-Frank elastic continuum theory with infinite anchoring energies. The average of the LC-director tilt angles over this profile was equivalent to the measured pretilt angle of the ITN cell.
Original languageEnglish
Pages (from-to)1024-1029
Number of pages6
JournalIEEE/OSA Journal of Display Technology
Volume10
Issue number12
DOIs
StatePublished - Dec 2014

Keywords

  • Inverse twisted nematic (ITN); liquid crystals (LCs); measurement; phase measurement; pretilt angle

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