Projection type display device

摘要

A projection type display device includes: a color separation optical system which separates light from a light source into light beams of a plurality of colors; and a plurality of polarization beam splitters, one being provided for each of the light beams of the plurality of colors which have been separated by the color separation optical system. The polarization beam splitter includes: an incidence face upon which light beam is incident; a polarization splitting plane that is obliquely arranged to achieve a predetermined angle which is smaller than 90° and greater than 45° between the incidence face and the polarization splitting plane; a first emitting face that is arranged perpendicular to the incidence face and from which light beam which has been incident upon the incidence face and has been reflected at the polarization splitting plane is emitted; and a second emitting face that is arranged parallel to the first emitting face and from which light beam which has been incident upon the first emitting face and has passed through the polarization splitting plane is emitted. And the polarization beam splitters are arranged so that in each of the polarization beam splitters, the light beam separated by the color separation optical system is incident upon the polarization splitting plane with an incident angle achieving by subtracting the predetermined angle from 90 degrees.