Asymmetric switching and charge transport in AFLC devices with dissimilar alignment layers

Pérez Medialdea, David and Beunis, F. and Bennis, Noureddine and Quintana Arregui, Patxi Xabier and Otón Sánchez, José Manuel and Neyts, K. (2009). Asymmetric switching and charge transport in AFLC devices with dissimilar alignment layers. In: "2nd International Workshop on Liquid Crystals for Photonics", 20/07/2008-22/07/2008, Cambridge, UK.

Description

Title: Asymmetric switching and charge transport in AFLC devices with dissimilar alignment layers
Author/s:
  • Pérez Medialdea, David
  • Beunis, F.
  • Bennis, Noureddine
  • Quintana Arregui, Patxi Xabier
  • Otón Sánchez, José Manuel
  • Neyts, K.
Item Type: Presentation at Congress or Conference (Article)
Event Title: 2nd International Workshop on Liquid Crystals for Photonics
Event Dates: 20/07/2008-22/07/2008
Event Location: Cambridge, UK
Title of Book: Proceedings of 2nd International Workshop on Liquid Crystals for Photonics
Date: 2009
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Tecnología Fotónica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Surface stabilized antiferroelectric liquid crystal (AFLC) devices with dissimilar alignment layers on the two surfaces are characterized by a shift in the electro-optical response [1] so that it is symmetric with respect to a nonzero voltage (figure 1). Because of this shift, the switching state of a pixel which is initially set by applying a short, selection, voltage pulse, may be maintained without applying any holding, bias, voltage. The stability at zero volts, together with the inherent range of grey levels, typical for antiferroelectric liquid crystals, has some potentially very interesting applications. Generally, the magnitude of the voltage shift changes slowly over time, depending on the driving conditions and the materials used. This varying asymmetry is an important obstacle for the implementation of this technology in real devices. Fig. 1. Asymmetric transmission–voltage characteristic of an AFLC cell with dissimilar alignment layers. 2. The influence of charge in asymmetric AFLC devices Charges in AFLCs can considerably influence the switching behavior of the device [2][3]. Measurements of the electric current flowing towards the electrodes of the device when a voltage step is applied can elucidate the nature and the behavior of these charges

More information

Item ID: 4232
DC Identifier: http://oa.upm.es/4232/
OAI Identifier: oai:oa.upm.es:4232
Deposited by: Memoria Investigacion
Deposited on: 29 Mar 2011 08:46
Last Modified: 20 Apr 2016 13:32
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