Effect of UV absorption anisotropy on hybrid aligned polymer stabilized liquid crystal cell

R. Yamaguchi; K. Inoue; T. Takasu

doi:10.1117/12.2235473

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26 September 2016 Effect of UV absorption anisotropy on hybrid aligned polymer stabilized liquid crystal cell

R. Yamaguchi, K. Inoue, T. Takasu

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Proceedings Volume 9940, Liquid Crystals XX; 994004 (2016) https://doi.org/10.1117/12.2235473
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States

Abstract

We have proposed a hybrid alignment nematic (HAN) liquid crystal cell using a polymer stabilized (PS) technology. The cell shows a reverse mode scattering property. The PS-HAN cell is transparent at any viewing angle in the off-state and has an asymmetrical scattering property at incident angles in the on-state. Applying the cell to a smart glass, it cell can selectively scatter a midday sunlight with a function of window blinds. In this study, two polymerization processes, an irradiation with UV light from planar and vertical aligned sides of the cell have been investigated. UV penetration depth has also been estimated from planar and vertical aligned sides of the cell. LC materials with different UV absorption spectra were prepared. A driving voltage, an optical property and a polymer morphology were measured in PS-HAN cells. The UV intensity profile have an effect on polymer density and particle size, which changed the driving voltage and the light scattering property in the PS-HAN cell. The study on the UV penetration in the polymer stabilized technology can improve their performance.

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R. Yamaguchi, K. Inoue, and T. Takasu "Effect of UV absorption anisotropy on hybrid aligned polymer stabilized liquid crystal cell", Proc. SPIE 9940, Liquid Crystals XX, 994004 (26 September 2016); https://doi.org/10.1117/12.2235473

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