Orientation photoaligned

Kawatsuki N, Hamano K, Ono H, Sasaki T, Goto K (2007) Molecular-oriented photoalignment layer for liquid mystals. Jpn J Appl Phys 46 339-341 Kawatsuki N, Nishioka E, Emoto A, Ono H, Kondo M (2012) Blazed surface relief formation in azobenzene-eontaining polymtaie films by asymmetric polarization holography. Appl Phys Express 5 041601... 

A vast amount of investigations on photoalignment of LCs has been reported during the past one and a half decades. Irradiation with LPL induces photo-induced anisotropy, in which molecules are generally oriented to an unexcitable direction, namely, perpendicular to the electric vector of the polarization direction. This effect is called photoinduced optical anisotropy (Seki, 2004 Natansohn and Rochon, 2002 Ichimura, 2000). 

In the previous sections we have discussed the use of the photoalignment techniques, in order to improve specific optically active parts of LCDs. We have shown that for the LC layer that forms the optical valve both in-plane and out-of-plane orientation is important to attain the correct switching behaviour. This is, however, not sufficient with respect to the front-of-screen performance, like contrast, brightness and viewing angle. In order to improve these properties of LCDs, patterned alignment for use in multidomain LCDs and retardation layers was discussed for respectively large and small... 

S.K.-H. Wei, L. Zeng, K.L. Marshall, S.H. Chen, Room-temperature processing of %-conjugated oligomers into uniaxially oriented monodomain films on coumarin-based photoalignment layers. J. Polym. Sci. Part B Polym. Phys. 49, 725-731 (2011)... 

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