PROJECTION-TYPE VIDEO DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To improve a contrast in a projection-type video display device. SOLUTION: To improve the contrast by overlapping a band between a wavelength whose efficiency of polarization rotation of a specified wavelength polarization conversion plate in an initial stage is 50% and a wavelength whose efficiency of polarization rotation of a specified wavelength polarization conversion plate in a rear stage is 50% with a band which is cut by a notch filter. COPYRIGHT: (C)2004,JPO