Determination of Director Profile of Twisted Nematic Liquid Crystal Cell with Tilted Surface Alignment by Renormalized Transmission Ellipsometry

Applying renormalized transmission ellipsometry (RTE), the evaluation of a director profile in the case of a twisted nematic cell with a relatively high pretilt angle was performed. To determine the director profile, we proposed a novel technique for determining four cell parameters, namely, the cell gap d, the pretilt angle θp, the twist angle of the director alignment φt, and the angle between the axis of the polarizer and the entrance liquid crystal director φi. To date, several methods of measuring the average tilt angle of a twisted nematic (TN) cell have been proposed, but our method of simultaneously determining the four cell parameters is considered to be quite effective in the evaluation of liquid crystal displays.