Multi-stable cholesteric liquid crystal windows with four optical states

Liyi Mo, Haitao Sun, Aihui Liang, Xiaofang Jiang, Lingling Shui, Guofu Zhou, Laurens T. de Haan & Xiaowen Hu*

Multi-stable cholesteric liquid crystal windows with four optical states

ABSTRACT

An electrically switchable multi-stable liquid crystal device is demonstrated based on a non-uniform cholesteric liquid crystal (CLC) structure in a single cell. The non-uniform CLC structure consists of a polymer stabilised CLC layer and a non-polymer stabilised CLC layer. By taking advantage of the difference in driving electric field strength of the two layers, the device can be switched electrically to four different states: the reflecting state, the reflecting and scattering co-existing state, the scattering-only state and the transparent state. The optical properties of the four states and the transition conditions between the states were elucidated. Moreover, all states with reflecting and/or scattering properties are stable for an extended period of time after switching off the electric field. Thanks to its multi-stability, this device can be used for energy-saving smart windows of automobiles, buildings and in architectural aesthetics. An electrically switchable multi-stable liquid crystal device is demonstrated based on a non-uniform cholesteric liquid crystal (CLC) structure in a single cell. The device can be switched electrically to four different states. All states with reflecting and/or scattering properties are stable for an extended period of time after switching off the electric field. Thanks to its multi-stability, this device can be used for energy-saving smart windows of automobiles, buildings and in architectural aesthetics.


Language English
Journal

Liquid Crystals

Year
2021
Pages
Volume
Issue number

Status

Published


KEYWORDS:Multi-stable,electricity driven,non-uniform cholesteric,switchable windows


DOI: https://doi.org/10.1080/02678292.2021.1962422


Fingerprint

  • smart window

    smart window

  • polymer stabilized liquid crys

    polymer stabilized liquid crystal


  • liquid crystal network

    liquid crystal network


  • electroresponsive

    electroresponsive


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Liyi Mo, Haitao Sun, Aihui Liang, Xiaofang Jiang, Lingling Shui, Guofu Zhou, Laurens T. de Haan & Xiaowen Hu*.Multi-stable cholesteric liquid crystal windows with four optical states.Liquid Crystals.2021

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