A backlight for liquid‐crystal‐display illumination is presented, in which s‐polarized light is preferentially coupled out by micro‐optical structures in a birefringent layer. In the experiments, contrasts higher than 15 have been obtained. A polarization dependent ray‐tracing model has been developed. Important guidelines for finding an optimal backlight configuration have been derived from the calculations.
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Blom et al. (2002) studied this question.