Abstract
A protocol based on systematic experimental measurements to characterize the electro-optic behavior of chiral smectic liquid-crystal (LC) materials with V/W-shaped responses is presented. An experimental smectic LC material has been checked by use of this protocol. It has been found that results derived from this procedure permit a reasonable evaluation of the electro-optic performance of these LC materials as well as their capability to be used in high-end display applications.
Highlights
The V-shaped electro-optic response was first reported in chiral smectic liquid-crystal (LC) displays in 1995 [1]
In the second model the arrangement coherence is maximum between layers, and molecules switch collectively
A large-area photodiode was used to measure optical transmittance in samples placed between crossed polarizers
Summary
The V-shaped electro-optic response was first reported in chiral smectic liquid-crystal (LC) displays in 1995 [1]. It has not been easy to do research on a model that explains the molecular arrangement and switching inside the cell. There are several theoretical and experimental studies that justify that thresholdless electro-. Received 25 February 2004; revised 18 March 2004; accepted 18 March 2004 5 April 2004 / Vol 12, No 7 / OPTICS EXPRESS 1205 optic behavior from different points of view, and from these studies two switching models have appeared. The first one is based on the molecular arrangement coherence inside each smectic layer and the molecular tilting randomness in adjacent layers [3]. In the second model the arrangement coherence is maximum between layers, and molecules switch collectively. Inside each layer the director-polarization couple exhibits a combined, elastic twisted-splayed deformation [4, 5]
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