Electro-Optical Property in Hybrid Aligned Reverse mode Cell Using Liquid Crystals with Positive and Negative Dielectric Constant Anisotropies

We have proposed polymer stabilized liquid crystal (LC) cells with a hybrid alignment nematic (HAN) LC. LCs with positive and negative dielectric constant anisotropies are used. The cell has a reverse mode electro-optical property which shows a transparent state in a voltage off-state and a light sc...

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Bibliographic Details
Published in:Journal of Photopolymer Science and Technology 2017/06/26, Vol.30(4), pp.463-466
Main Authors: Yamaguchi, Rumiko, Inoue, Kota, Oikawa, Yuki, Takasu, Tomoya
Format: Article
Language:English
Subjects:
Dielectric constant anisotropy
Hybrid alignment
Light scattering
Liquid crystal
Polymer stabilized
Reverse mode
Smart window
UV absorption
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Summary:We have proposed polymer stabilized liquid crystal (LC) cells with a hybrid alignment nematic (HAN) LC. LCs with positive and negative dielectric constant anisotropies are used. The cell has a reverse mode electro-optical property which shows a transparent state in a voltage off-state and a light scattering state in the on-state. We fabricate cells by irradiating the cell with a UV light from a planar alignment side or vertical alignment side in a polymerization process. The photopolymerization-induced segregation of the polymer from the LC and the influence of UV absorption by the LC bulk are investigated. A relationship between UV irradiation conditions and electro-optical characteristics in the cell is clarified. The light scattering intensity depends on an incident angle of light in the on-state, which is promising for application to smart windows. The feasibility of this concept is demonstrated with consideration of LC materials.
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.30.463