Patent ID: 7234821

Claim:
A projection device having single light valve, suitable for projecting an image to a screen, the projection device comprising: a light source, for providing a light beam; a projection lens, disposed behind the light source, and located on a propagation path of the light beam; an image unit, disposed between the light source and the projection lens, and located on the propagation path of the light beam, wherein the image unit comprises a color production device and a light valve disposed behind the color production device, and located on the propagation path of the light beam, wherein the color production device comprises a plurality of filtering regions corresponding to a plurality of color lights of the light beam, and each of the filtering regions being on the propagation path indicates a state of the color production device; and a beam breaker module, disposed between the light source and the screen, and the beam breaker module selectively cutting in or cutting out from the propagation path of the light beam, wherein when the beam breaker module cuts in the propagation path of the light beam, the beam breaker module blocks the light beam passing through a part of the filtering regions, and when the beam breaker module cuts out from the propagation path of the light beam, the light beam passing through the other pan of the filtering regions is projected to the screen by the projection lens.