An image display apparatus which includes at least one light source to generate and radiate a light beam, a color separating unit to separate the light beam emitted from the light source into a plurality of color light beams and make at least one of the separated color light beams and the other color...http://www.google.se/patents/US7287858?utm_source=gb-gplus-sharePatent US7287858 - Color separating unit and projection type image display apparatus employing the same
