Pleochroic dye liquid-crystal displays are generally characterized by the order parameter (S) or the contrast ratio (CR) of the dye at its absorption maximum. In this paper, we show the pitfalls of relying on these criteria. Instead, we introduce a descriptor that includes the relative spectral efficiencies for photopic vision that does correlate with viewer preferences. In addition, we delineate dye properties that are important for display applications.
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Bloom et al. (1977) studied this question.
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