Patent ID: 6910775
Filing Date: 2005-06-28
Classification: H04N

Abstract:
1. A projection-type video display apparatus comprising: a light source unit which emits light; video display devices as light bulb means which forms optical images according to a video signal; an illumination optical system which causes, the light from said light source unit to be irradiated onto said video display devices; a color separation/combining unit which separates the light for separation and into a plurality of color light, and combines the light reflected from said video display devices; and a projector which projects the combined light, said color separation/combining unit comprising: said video display devices being placed on the sides on which the light from said light source unit is transmitted through and reflected from the separation surface of said polarization separation element, and the band between a wavelength of light to which the polarization converting efficiency of said first specific-wavelength converter element is about 50% and another wavelength of light to which the polarization converting efficiency of said second specific-wavelength converter element is about 50% includes the same band as does said predetermined band to be cut off by said predetermined-band cutting-off element.