Abstract
We report a brief method of measuring the order parameter of liquid crystal (LC) depending on the cell gap. The method utilizes polarized ultraviolet-light (UV) absorption of host-guest LC in a wedge cell. We applied this method to evaluate the order parameters of LC on polarized-UV-exposed polyimide (PI) films compared with those on rubbed PI films. The results suggest that the order parameter of LC gradually decreases with decreasing cell gap. Furthermore, the relative order parameters of LC on UV-exposed PI films show a stronger dependence on the LC layer thickness than those on rubbed PI films.