Abstract

The nanoparticles-induced vertical alignment technique was applied to generate variable liquid-crystal pretilt angles based on doping different concentrations of polyhedral oligomeric silsesquioxane (POSS) nanoparticles in the planar-aligned liquid crystal cells. Competition between the homogeneously aligned polyimide layer and POSS-induced spontaneous vertical alignment domain generated the variable pretilt angle. Experimental results demonstrated that the pretilt angle ${\theta }_p$ is a function of the doped POSS concentration and can be controlled continuously over the range of $0°<{\theta }_p<90°$.

© 2009 Optical Society of America

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