Light shutters and electro-optical storage devices from antiferroelectric liquid crystals of bent-shape molecules

Antal Jákli, Liang Chi Chien, Daniel Krüerke, Sebastian Rauch, Hans Sawade, Philippe Bault, Gerd Heppke, Katalin Fodor-Csorba, Geetha G. Nair

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

Novel scattering-type displays using antiferroelectric smectic phases of liquid crystals of bent-shape molecules are reviewed and discussed. There can be two distinct states ("racemic" and "chiral") that work in opposite ways. The racemic structure is scattering in the OFF state and is optically clear under sufficiently large (E∼4-6V/μm) electric fields. The chiral structure is transparent at zero fields and scattering in the field ON state. These two structures may be reversibly interchanged implying their use in devices that consume energy only during switching from one stable state to the other. After summarizing the previous results on the film thickness, driving voltage and temperature dependences of the light shutters, new results will be presented on a banana smectic material, which has an optically isotropic transparent antiferroelectric OFF state. We show that the optically isotropic and transparent OFF state can be reversibly switched to birefringent and scattering ferroelectric states in less than hundred microseconds.

Original languageEnglish
Pages (from-to)73-80
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5003
DOIs
Publication statusPublished - Aug 8 2003
EventLiquid Crystal Materials, Devices, and Applications IX - Santa Clara, CA, United States
Duration: Jan 21 2003Jan 22 2003

Keywords

  • 'Banana liquid crystals"
  • Antiferroelectric
  • Optically isotropic
  • Scattering display
  • Storage device

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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