Full prediction of the broadband optical modulation performance of a twisted nematic liquid crystal cell |
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Authors: | Ignacio Moreno Ana M Cutillas Pablo Velásquez Felipe Mateos |
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Institution: | a Departamento de Ciencia de Materiales, Optica y Tecnología Electrónica. Universidad Miguel Hernández, 03202 Elche, Spain b Arca Telecom, Ave. Giorgeta 16, Valencia, Spain c Departamento de Física y Arquitectura de Computadores, Universidad Miguel Hernández, 03202 Elche, Spain d Instituto de Bioingeniería. Universidad Miguel Hernández, 03202 Elche, Spain |
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Abstract: | We present a procedure to obtain the physical parameters responsible of twisted nematic liquid crystal (LC) cells optical modulation. The novelty of our approach is based on the use of spectroscopic measurements of the light transmitted by the system polarizer-LC cell-analyzer, combined with a previously proposed simple physical model of the LC twist and tilt distribution along cell. The procedure involves two steps: the first one yields off-state parameters like the LC director orientation, the twist angle, and the optical path difference (cell gap); the second step yields the effective retardances of the central and edge LC layers. The use of a spectroscopic method provides a full characterization of the LC cell as a function of both the voltage and the wavelength. The complete procedure leads to a very accurate prediction of the transmitted light broadband spectrum, as well as the complex (amplitude and phase) modulation for any wavelength within the calibration range. |
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Keywords: | Liquid crystal displays Broadband illumination Phase modulation |
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