Smart window with reduced operating voltage and frequency by combining NMP-LC and EHDI scattering effects

Niveen Huseen, Zaher M.A. Judeh, Ibrahim Abdulhalim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Recently a new mode of liquid crystal LC SW was developed based on the doping of nanoporous microparticles in LCs called NMP-LC mode. However, all the works reported so far used an LC with positive dielectric anisotropy that gave a normally opaque window. Here we report on a normally transparent smart window based on NMP-LC mode using vertical alignment and an LC with negative dielectric anisotropy, doped with cochleate organic particles. The device exhibits a high transparency in the OFF state and a high scattering in the ON state compared with normally opaque NMP-LC. The durability test shows that the SW device switches at least 5184 times without degradation of optical contrast. The scattering mode is caused by the combination of two effects: the NMP effect and the electro-hydrodynamic instability effect. The synergy between these two effects manifests in lower operating voltage and frequency requirements for the device, hence less energy consumption. The electric power that is needed is estimated to be 0.25

Original languageEnglish
Title of host publicationLiquid Crystals Optics and Photonic Devices
EditorsIbrahim Abdulhalim, Camilla Parmeggiani
PublisherSPIE
ISBN (Electronic)9781510673502
DOIs
StatePublished - 1 Jan 2024
EventLiquid Crystals Optics and Photonic Devices 2024 - Strasbourg, France
Duration: 8 Apr 202411 Apr 2024

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume13016
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceLiquid Crystals Optics and Photonic Devices 2024
Country/TerritoryFrance
CityStrasbourg
Period8/04/2411/04/24

Keywords

  • electro-hydrodynamic instability effect
  • light scattering
  • liquid crystals
  • nano-porous micro-particles
  • smart windows

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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