Determination of the twist angle and the retardation properties of twisted nematic liquid crystal television by spectral measurements
- 1 February 1998
- journal article
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 37 (2) , 629
- https://doi.org/10.1117/1.601863
Abstract
We describe a method to determine the anisotropic parameters of liquid crystal televisions (LCTVs) formed by twisted nematic liquid crystals, as a function of the wavelength over a broad spectral range. One of them is the twist angle Φ and the second, β, is related to the birefringence of the liquid crystal. The method is based on the concept of the channeled spectrum and applies whenever the user has no information about the structure of the cell and the molecular director. It is shown that the recording of three channeled spectra is sufficient to determine the twist angle and the retardation properties of the cell. The method is illustrated with the experimental characterization of red, green, and blue LCTVs from a video projector. © 1998 Society of Photo-Optical Instrumentation Engineers.Keywords
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