Patent ID: 6783241
Filing Date: 2004-08-31
Classification: G02B,H04N

Abstract:
A projection-type display device, comprising:a reflection-type image-forming means for spatially modulating and reflecting illumination light of a predetermined plane polarization to emit an optical image with a plane polarization rotated with respect to the plane polarization of the illumination light; a projection optical system for projecting the optical image; a light source for emitting light including the illumination light; and a plane polarization conversion means for converting the emitted light from the light source to illumination light of a plane polarization corresponding to the plane polarization of the light incident on the reflection-type image-forming means; a polarization beam splitter for emitting the illumination light directed from the light source through the plane polarization conversion means toward the reflection-type image-forming means in line with an axis and emitting the optical image redirected from the reflection-type image-forming means in line with the axis to the projection optical system; and a polarization separation element forming a plate on an incident facet of the illumination light of the polarization beam splitter for selectively transmitting illumination light of a plane polarization corresponding to the plane polarization of the light incident on the reflection-type image-forming means and selectively reflecting the component of the plane polarization orthogonal to that plane polarization arranged between the light source and the polarization beam splitter.