Patent ID: 6956551
Filing Date: 2005-10-18
Classification: G02B,H04N

Abstract:
1. Device for displaying images on a projection screen of the type comprising: a light source emitting a beam B means for deconstructing this polychromatic light beam into complementary light beams B in the path of each of the complementary light beams B the optical axis of each incident complementary beam B means for reconstructing the reflected complementary beams B′ and an optical system for projecting onto a screen the images of the reflecting matrices M wherein one of the deconstructing means and reconstructing means comprise two dichroic filters with a gradient arranged so that the optical axis of at least one of the incident beam, the beam to be deconstructed and the beam to be reconstructed forms, with these filters and at a midpoint of incidence O, an angle of incidence approximately equal to a predetermined angle of incidence β the cutoff wavelength of each filter being approximately constant for all the rays of the same beam whose points of incidence on the filter are aligned in the direction HOG, H′OG′ of the gradient, wherein, for at least one of these filters, the direction of the gradient makes a non-zero angle of inclination of gradient δ, δ′ with a plane orthogonal to the reflecting surfaces of the matrices M