High contrast front projection screen

摘要

A front projection screen and a projection system incorporating same are disclosed. The front projection screen includes a plurality of cholesteric liquid crystal layers and one or more retarder layers. Each cholesteric liquid crystal layer has a reflectance curve characterized by a reflectance peak and a reflectance full width at half maximum. The reflectance peaks of at least two cholesteric liquid crystal layers in the plurality of cholesteric liquid crystal layers are located at different wavelengths. A retardance full width at half maximum of a first retarder layer in the one or more retarder layers encloses the reflectance full width at half maxima of two or more cholesteric liquid crystal layers in the plurality of cholesteric liquid crystal layers.