Patent ID: 8142022
Filing Date: 2012-03-27
Classification: G02B,G03B,H04N

Abstract:
1. An image display apparatus configured to display an image, the image display apparatus comprising: an illumination optical system configured to introduce a first light beam that originates from a first light source and a second light beam that originates from a second light source to an image display element, wherein the illumination optical system includes: a first beam splitting unit configured to split the first light beam into a plurality of light beams on a first section, wherein the first beam splitting unit includes a cylinder lens array, a second beam splitting unit configured to split the first light beam into a plurality of light beams on a second section orthogonal to the first section, a first polarization conversion element configured to convert the first light beam into first polarized light beams having a first polarization direction, a third beam splitting unit configured to split the second light beam into a plurality of light beams on the first section, wherein the third beam splitting unit includes a cylinder lens array, a fourth beam splitting unit configured to split the second light beam into a plurality of light beams on a third section orthogonal to the first section and the second section, a second polarization conversion element configured to convert the second light beam into second polarized light beams having a second polarization direction orthogonal to the first polarization direction, a first beam combining unit configured to combine, into combined light beams, a plurality of the first polarized light beams that have passed the first beam splitting unit, the second beam splitting unit, and the first polarization conversion element with a plurality of the second polarized light beams that have passed the third beam splitting unit, the fourth beam splitting unit, and the second polarization conversion element, a third polarization conversion element configured to convert a plurality of the combined light beams from the first beam combining unit into a plurality of polarized light beams having a polarization direction of one of the first polarization direction and the second polarization direction, a condensing unit configured to superimpose the plurality of polarized light beams from the third polarization conversion element onto the image display element, and wherein a focal length of the condensing unit on the first section is different from a focal length of the condensing unit on the second section.