Liquid crystals have been extensively studied and are massively used in display technology. Their recent use to provide optical shutters in active glasses for 3D cinema has focused the attention on new specific requirements. Recent improvements in the quality of 3D movies production and projection (e.g., involving triple flash projectors) resulted in the need for high quality glasses with no ghosting, no color banding, large viewing angle and good residual light. We present here the main relevant parameters to assess the quality required today by the studios and we compare the main liquid crystal options which can be used with their respective advantages.
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