Analysis of Light Wave Propagation in In-Plane Switching Liquid-Crystal Devices by Finite-Difference Time-Domain Method

Hideo KAWANO  Atsushi MATSUMOTO  Tanroku MIYOSHI  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.12   pp.2172-2178
Publication Date: 2004/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Organic Molecular Electronics
liquid-crystal display (LCD),  in-plane switching (IPS),  finite-difference time-domain method (FDTD),  color shift,  

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Liquid-crystal devices with in-plane switching electrodes (IPS-LCD) are superior to twisted nematic ones in their wider range of viewing angle, but show serious color shift with viewing angle. The color shift is a phenomenon governed by the three-dimensional orientation of liquid-crystal molecules. In order to evaluate such effects numerically, light wave propagation in the IPS-LCD is studied using a two-dimensional finite-difference time-domain method, where all six components of electromagnetic field are analysed and the three-dimensional properties of liquid-crystal materials are taken into account through the dielectric tensor. The computational space termination is provided by a combination of the uniaxial perfectly matched layer and periodic boundary conditions. It is found for the first time numerically that the color shift effects strongly depend on the asymmetrical profile of liquid-crystal orientation, which is originated from the small pretilt angle.