Smart windows with functions of reflective display and indoor temperature-control

I-Hui Lee; Yu-Ching Chao; Chih-Cheng Hsu; Liang-Chao Chang; Tien-Lung Chiu; Jiunn-Yih Lee; Fu-Jen Kao; Chih-Kung Lee; Jiun-Haw Lee

doi:10.1117/12.839815

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12 February 2010 Smart windows with functions of reflective display and indoor temperature-control

I-Hui Lee, Yu-Ching Chao, Chih-Cheng Hsu, Liang-Chao Chang, Tien-Lung Chiu, Jiunn-Yih Lee, Fu-Jen Kao, Chih-Kung Lee, Jiun-Haw Lee

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Proceedings Volume 7618, Emerging Liquid Crystal Technologies V; 761816 (2010) https://doi.org/10.1117/12.839815
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

In this paper, a switchable window based on cholestreric liquid crystal (CLC) was demonstrated. Under different applied voltages, incoming light at visible and infrared wavelengths was modulated, respectively. A mixture of CLC with a nematic liquid crystal and a chiral dopant selectively reflected infrared light without bias, which effectively reduced the indoor temperature under sunlight illumination. At this time, transmission at visible range was kept at high and the windows looked transparent. With increasing the voltage to 15V, CLC changed to focal conic state and can be used as a reflective display, a privacy window, or a screen for projector. Under a high voltage (30V), homeotropic state was achieved. At this time, both infrared and visible light can transmit which acted as a normal window, which permitted infrared spectrum of winter sunlight to enter the room so as to reduce the heating requirement. Such a device can be used as a switchable window in smart buildings, green houses and windshields.

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I-Hui Lee, Yu-Ching Chao, Chih-Cheng Hsu, Liang-Chao Chang, Tien-Lung Chiu, Jiunn-Yih Lee, Fu-Jen Kao, Chih-Kung Lee, and Jiun-Haw Lee "Smart windows with functions of reflective display and indoor temperature-control", Proc. SPIE 7618, Emerging Liquid Crystal Technologies V, 761816 (12 February 2010); https://doi.org/10.1117/12.839815

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