Fast and accurate measurement of liquid crystal tilt bias angle with the ELDIM EZContrast system

Olivier Moreau; Thierry R. Leroux

doi:10.1117/12.364329

16 September 1999 Fast and accurate measurement of liquid crystal tilt bias angle with the ELDIM EZContrast system

Olivier Moreau, Thierry R. Leroux

Proceedings Volume 3826, Polarization and Color Techniques in Industrial Inspection; (1999) https://doi.org/10.1117/12.364329
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

The angle between the optical axis of a nematic liquid crystal and the inner surface of the cell strongly influences the electro-optical performances of the liquid crystal display devices. We report an accurate method to quickly determine the tilt bias angle of an anti-parallel liquid crystal cell using our spatial photometer EZContrast. The measurement system provides instant observation at an infinite distance, without mechanical scanning, of the interference figure obtained with the sample in a plus or minus 80 degree measurement angle. The tilt bias angle and the cell gap are deduced by fitting the intensity extrema of the figure. Thanks to the large set of data, it is also possible to know the error due to misalignment between the cell normal and the EZContrast axis and, consequently, this method is not influenced by the operator skill.

Citation Download Citation

Olivier Moreau and Thierry R. Leroux "Fast and accurate measurement of liquid crystal tilt bias angle with the ELDIM EZContrast system", Proc. SPIE 3826, Polarization and Color Techniques in Industrial Inspection, (16 September 1999); https://doi.org/10.1117/12.364329

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