Continuous control of liquid crystal pretilt angle from homeotropic to planar

摘要

A mixture of two polyamic acids, one having an alkyl side chain and ordinarily used for vertical liquid crystal alignment and the other without a side chain and ordinarily used for planar alignment, is deposited on two substrates and baked at high temperatures. When the resulting cell is filled with the liquid crystal pentyl cyanobiphenyl, it is found that the pretilt angle θ_0 is a function of the baking temperature, and can be controlled continuously over the range of 0° ≤ θ_0 approx < 90°.