Method and apparatus for minimization of skew light rays in...

G - Physics – 02 – B

Patent

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G02B 27/28 (2006.01) H04N 9/31 (2006.01)

Patent

CA 2551837

A method and apparatus for enhancing performance of a projection system by blocking incident angle light rays without increasing the F-number of the system includes a skew filter having a shaped aperture. The skew filter blocks a substantial portion of the skew light rays (36) while allowing other light rays (34) to pass through the projection system. The shape of the aperture relates to a constant contrast curve (50) of a polarizing beam splitter (24) for a cone of light incident on the polarizing beam splitter.

L'invention concerne un procédé et un appareil pour améliorer les performances d'un système de projection comprenant le blocage des rayons de lumière à angle incident sans augmentation du nombre F du système, comprenant un filtre oblique présentant un orifice. Le filtre oblique bloque une partie des rayons de lumière oblique (36), tout en permettant aux autres rayons de lumière (34) de passer à travers le système de projection. La forme de l'orifice comporte une courbe (50) de contraste constante d'un diviseur de faisceau (24) de polarisation pour un cône de lumière incidente sur le diviseur de faisceau de polarisation.

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