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Smart Window with Active-Passive Hybrid Control

Dimming and scattering control are two of the major features of smart windows, which provide adjustable sunlight intensity and protect the privacy of people in a building. A hybrid photo- and electrical-controllable smart window that exploits salt and photochromic dichroic dye-doped cholesteric liqu...

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Autores principales: Tseng, Heng-Yi, Chang, Li-Min, Lin, Kuan-Wu, Li, Cheng-Chang, Lin, Wan-Hsuan, Wang, Chun-Ta, Lin, Chien-Wen, Liu, Shih-Hsien, Lin, Tsung-Hsien
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7560287/
https://www.ncbi.nlm.nih.gov/pubmed/32957577
http://dx.doi.org/10.3390/ma13184137
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author Tseng, Heng-Yi
Chang, Li-Min
Lin, Kuan-Wu
Li, Cheng-Chang
Lin, Wan-Hsuan
Wang, Chun-Ta
Lin, Chien-Wen
Liu, Shih-Hsien
Lin, Tsung-Hsien
author_facet Tseng, Heng-Yi
Chang, Li-Min
Lin, Kuan-Wu
Li, Cheng-Chang
Lin, Wan-Hsuan
Wang, Chun-Ta
Lin, Chien-Wen
Liu, Shih-Hsien
Lin, Tsung-Hsien
author_sort Tseng, Heng-Yi
collection PubMed
description Dimming and scattering control are two of the major features of smart windows, which provide adjustable sunlight intensity and protect the privacy of people in a building. A hybrid photo- and electrical-controllable smart window that exploits salt and photochromic dichroic dye-doped cholesteric liquid crystal was developed. The photochromic dichroic dye causes a change in transmittance from high to low upon exposure to sunlight. When the light source is removed, the smart window returns from colored to colorless. The salt-doped cholesteric liquid crystal can be bi-stably switched from transparent into the scattering state by a low-frequency voltage pulse and switched back to its transparent state by a high-frequency voltage pulse. In its operating mode, an LC smart window can be passively dimmed by sunlight and the haze can be actively controlled by applying an electrical field to it; it therefore exhibits four optical states—transparent, scattering, dark clear, and dark opaque. Each state is stable in the absence of an applied voltage. This smart window can automatically dim when the sunlight gets stronger, and according to user needs, actively adjust the haze to achieve privacy protection.
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spelling pubmed-75602872020-10-22 Smart Window with Active-Passive Hybrid Control Tseng, Heng-Yi Chang, Li-Min Lin, Kuan-Wu Li, Cheng-Chang Lin, Wan-Hsuan Wang, Chun-Ta Lin, Chien-Wen Liu, Shih-Hsien Lin, Tsung-Hsien Materials (Basel) Article Dimming and scattering control are two of the major features of smart windows, which provide adjustable sunlight intensity and protect the privacy of people in a building. A hybrid photo- and electrical-controllable smart window that exploits salt and photochromic dichroic dye-doped cholesteric liquid crystal was developed. The photochromic dichroic dye causes a change in transmittance from high to low upon exposure to sunlight. When the light source is removed, the smart window returns from colored to colorless. The salt-doped cholesteric liquid crystal can be bi-stably switched from transparent into the scattering state by a low-frequency voltage pulse and switched back to its transparent state by a high-frequency voltage pulse. In its operating mode, an LC smart window can be passively dimmed by sunlight and the haze can be actively controlled by applying an electrical field to it; it therefore exhibits four optical states—transparent, scattering, dark clear, and dark opaque. Each state is stable in the absence of an applied voltage. This smart window can automatically dim when the sunlight gets stronger, and according to user needs, actively adjust the haze to achieve privacy protection. MDPI 2020-09-17 /pmc/articles/PMC7560287/ /pubmed/32957577 http://dx.doi.org/10.3390/ma13184137 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Tseng, Heng-Yi
Chang, Li-Min
Lin, Kuan-Wu
Li, Cheng-Chang
Lin, Wan-Hsuan
Wang, Chun-Ta
Lin, Chien-Wen
Liu, Shih-Hsien
Lin, Tsung-Hsien
Smart Window with Active-Passive Hybrid Control
title Smart Window with Active-Passive Hybrid Control
title_full Smart Window with Active-Passive Hybrid Control
title_fullStr Smart Window with Active-Passive Hybrid Control
title_full_unstemmed Smart Window with Active-Passive Hybrid Control
title_short Smart Window with Active-Passive Hybrid Control
title_sort smart window with active-passive hybrid control
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7560287/
https://www.ncbi.nlm.nih.gov/pubmed/32957577
http://dx.doi.org/10.3390/ma13184137
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