Rear projection screen using birefringent optical film for...

G - Physics – 03 – B

Patent

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G03B 21/62 (2006.01)

Patent

CA 2382775

A dispersing element for a rear projection screen assembly is sensitive to the polarization of the light passing through the element. In particular, the element disperses light having a first polarization differently from light having a second polarization orthogonal to the first polarization. The dispersing element may be aligned with a polarization axis neither parallel nor perpendicular to the polarization of the light passing through the element. The dispersing element may also be employed with a polarizer to remove unwanted light that propagates through the dispersing element. The dispersing element may also be rotatably mounted relative to a polarized light source so as to vary the angle between the polarization axis of the element and the polarization direction of the light.

Elément dispersant pour un ensemble écran de rétroprojection qui est sensible à la polarisation de la lumière passant à travers l'élément. En particulier, l'élément disperse différemment de la lumière possédant une première polarisation et de la lumière ayant une seconde polarisation orthogonale par rapport à la première polarisation. L'élément dispersant peut être aligné avec un axe de polarisation qui n'est ni parallèle ni perpendiculaire à la polarisation de la lumière passant à travers l'élément. L'élément dispersant peut aussi être employé avec un polariseur pour empêcher la lumière non-désirée de se propager à travers l'élément dispersant. Cet élément peut aussi être monté rotatif par rapport à une source de lumière polarisée de façon à modifier l'angle entre l'axe de polarisation de l'élément et la direction de la polarisation de la lumière.

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