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Uniform Vertical Alignment of Liquid Crystal That Has a Large Negative Dielectric Anisotropy

We report that when a material that has a longitudinal dipole, (and therefore a positive dielectric anisotropy), is added to liquid crystalline materials that have a large negative dielectric anisotropy, that greatly improved vertical alignment is achieved. Specifically the addition of 5CB, with a weight percentage ranging from 2% to higher than 10%, to a commercial high negative Δε material, is found to change the alignment of the mixture from homogeneous to vertical. We also provide an explanation of the contradiction of this result with previous predictions that materials with a negative dielectric anisotropy should favor vertical alignment, while positive materials should favor homogeneous alignment.