Patent ID: 6036318
Filing Date: 2000-03-14
Classification: H04N

Abstract:
A projection type display apparatus, comprising:a light source;a first optical element for collecting light beams from said light source and dividing the light beams into a plurality of intermediate light beams;a second optical element disposed on a side of a light emerging surface of said first optical element;only one reflection type modulation element for modulating light beams emerging from said second optical element; anda polarized light beam selection element disposed on a light path between said second optical element and said reflection type modulation element for reflecting the light beams emerging from said second optical element or causing the light beams to pass therethrough to thereby cause the light beams to reach said reflection type modulation element as well as causing light beams modulated by said reflection type modulation element to pass therethrough or reflecting the modulated light beams to thereby cause the modulated light beams to reach a projection optical system,wherein said second optical element comprises:a polarized light conversion element separating each of intermediate light beams into P-polarized light beams and S-polarized light beams and modifying a polarization direction of a first one of the P-polarized light beams and the S-polarized light beams to have a same polarization direction as a second one of the P-polarized light beams and the S-polarized light beams; anda superimposing element disposed on a side of a light emerging surface of said polarized light conversion element to receive the polarized light beams and superimposing each of the polarized light beams on said reflection type modulation element.