Theoretical and experimental contrast ratios are compared for homogeneous-to-homeotropic liquid-crystal cells containing fluorescent dye molecules activated by ultraviolet light. Two-color fluorescent displays are described in which one active fluor dissolved in the liquid crystal is used as a UV shutter to switch a passive fluor external to the cell. Contrast ratios of about 8 have been achieved simultaneously for both colors, if two polarizers are used and about 7, if only one polarizer is employed.
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Filas et al. (1981) studied this question.
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