Determination of the Azimuthal Anchoring Strength by Measuring the Twist Angle and Thickness of a Twisted Nematic Liquid Crystal Cell

Abstract

It is experimentally demonstrated that selecting an appropriate wave length of the incident light is required to avoid the Mauguin Minimum condition in which the actual twist angle cannot be estimated by optical measurement. The all of the optical component such as the glass substrates, indium thin oxide electrode films, alignment films and liquid crystal itself play an important role in the optical polarization state of the outgoing light, therefore we re-examined the measurement method for the evaluation of the anchoring strength and proposed a modified method by using multi-wavelength laser.