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Optical characteristics of twisted nematic liquid-crystal films |
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| Authors: | Gooch C.H. Tarry H.A. |
| Affiliation: | Services Electronics Research Laboratory, Baldock, UK; |
| Abstract: | A twisted nematic liquid crystal is shown by theory and experiment to rotate incident plane-polarised light by ?/2 only at specified wavelengths. At other wavelengths, elliptically polarised light is produced. This action determines the contrast ratio of some twisted nematic devices. |
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