1 February 1998 Physics and applications of LC photo-alignment: recent results
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Abstract
The photo-aligning of LC layers by UV-illumination seems to provide a new advanced technology for all types of LCDs, especially AM-LCDs. Recently certain new results were obtained, which based ont eh extensions of the photo- aligning materials to the common classes of polymer aligning agents, such as polyimides, polysiloxanes etc. Pretilt angles on the substrates were definitely obtained, which enable to fabricate STN and AM-LCDs with large surface areas. The progress in application of LC photo-aligning for LCDs stimulates a fundamental research in the field. We will consider UV-illumination in photoanisotropic films, such as a photo-orientation of the absorption oscillator of the molecular clusters perpendicular to the polarization vector of the UV-light and characterize this process by the specific material constants. This characterization will further enable us to define such important parameter as an anchoring energy of LC with the photoactivated substrate. We will also discuss such problems as a stability of photoaligned LC layers with respect to an external UV and IR light exposure, and will show that a certain progress in this direction was obtained. Finally we plan to review some LCD display constructions, that can be efficiently obtained by the method of UV-illumination technique.
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Vladimir G. Chigrinov, Vladimir G. Chigrinov, Vladimir M. Kozenkov, Vladimir M. Kozenkov, } "Physics and applications of LC photo-alignment: recent results", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); doi: 10.1117/12.300025; https://doi.org/10.1117/12.300025
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