An optimization method was developed for improving the designs of broadband linear polarization converters using a twisted nematic liquid crystal film and two uniaxial compensation films. As compared to the Poincaré Sphere approach, our optimization method takes the material dispersions into consideration and results in a broader bandwidth. Such a broadband half-wave film is particularly useful for enhancing the light efficiency of liquid crystal display devices.
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Wu et al. (2003) studied this question.
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