Patent ID: 6753829
Filing Date: 2004-06-22
Classification: G09G,H04N

Abstract:
A projection image display apparatus which comprises an image display element for sequentially displaying gradation images, and an illumination device for sequentially irradiating said image display element with light beams of different colors, and allows a full-color image to be recognized by synchronizing display of the images with light emission,wherein said illumination device includes a white light source for emitting white light toward said image display element, first filter means rotatably supported between said image display element and said white light source, first filter driving means for driving to rotate said first filter means, second filter means supported movably along said first filter means, and second filter driving means for driving or non-driving said second filter means in accordance with an image to be displayed, said first filter means is divided into at least first to third filter sections with different transmission light wavelength regions, and driven to be rotated by said first filter driving means to sequentially insert said filter sections in an optical path of the white light, and said second filter means is set to a transmission light wavelength region overlapping said first filter section, and is driven by said second filter driving means such that, when said first filter section is inserted in the optical path of the white light, said second filter means is also inserted in the optical path, and, when said first filter section is removed from the optical path of the white light, said second filter means is also removed from the optical path.