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P‐106: Pretilt Angles and Liquid‐Crystal Director‐Deformation Profiles of Inverse Twisted Nematic Liquid Crystal Cells
Author(s) -
Wang ShengYa,
Lin ChiaYi,
Yang KeiHsiung
Publication year - 2014
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2014.tb00365.x
Subject(s) - liquid crystal , homeotropic alignment , rubbing , tilt (camera) , materials science , anchoring , optics , deformation (meteorology) , liquid crystal display , condensed matter physics , composite material , optoelectronics , geometry , physics , mathematics , structural engineering , engineering
We have developed a simple optical method and analyzed data by extended Jones matrix method to obtain pretilt angles of invesed twist nematic (ITN) and tilted homeotropic liquid crystal (LC) cells. 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 LC director‐deformation profile within the ITN cell based on Oseen‐Frank elastic continuum theory with infinite anchoring energy. The average of the LC tilt angles over this profile was equivalent to the measured pretilt angle of the ITN cell.