Patent ID: 6822737
Filing Date: 2004-11-23
Classification: G01B,G02F

Abstract:
A method for detecting a pretilt angle of an element in which the direction of orientation of molecules is twisted from a light incident side to light outgoing side, the method comprising:measuring transmitted light intensity of light from the light incident side for a plurality of light incident angles by rotating the element about an axis perpendicular to the direction of transmitted light towards the element; analyzing dependence of the measured transmitted light intensity for the plurality of light incident angles wherein an apparent retardation for the plurality of light incident angles is determined based upon the measured transmitted light intensity for the plurality of light incident angle wherein the pretilt angle of the element is determined based upon the determined apparent retardation for the plurality of light incident angles; and determining the pretilt angle of the element based upon the analysis results wherein an average tilt angle is determined based upon the determined apparent retardation for the plurality of light incident angles, and the pretilt angle is determined based upon the determined average tilt angle.