Patent ID: 6650472
Filing Date: 2003-11-18
Classification: C03C,G02B,G02F,G03B,H04N

Abstract:
A rear projection type display apparatus including a projecting apparatus for projecting an optical image and a transmission type screen, on a rear face of which projected light from the projecting apparatus is incident, for displaying the projected light at a front face thereof, the rear projection type display apparatus characterized in that:the projecting apparatus comprises a single tube type projecting apparatus having a light source, two-dimensional optical switch elements for modulating light from the light source into an optical image in accordance with image information and a projecting lens for enlarging and projecting the optical image after the modulation, and further comprises: polarized light state aligning means for making polarized states of optical image lights formed by the two-dimensional optical switch elements substantially coincide with each other over the entire region of visible wavelengths when the optical image after the modulation emitted from the projecting apparatus is incident on the transmission type screen; and the transmission type screen is constituted of a light distribution control element including a transparent base member, a number of micro-lenses densely arranged on one face of the transparent base member and a light absorbing layer having very small opening portions substantially at focal positions of the micro-lenses, the transparent base member being constituted of a transparent body which is substantially isotropic optically or a transparent body having uniaxial optical anisotropy, and light flux collimating means provided on a projected light incident side of the light distribution control element.