Polarization conversion system and method for stereoscopic...

G - Physics – 02 – B

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G02B 27/26 (2006.01) G02B 5/30 (2006.01) G02B 27/18 (2006.01)

Patent

CA 2686928

A polarization conversion system separates light from an unpolarized image source into a first state of polarization (SOP) and an orthogonal second SOP, and directs the polarized light on first and second light paths. The SOP of light on only one of the light paths is transformed to an orthogonal state such that both light paths have the same SOP. A polarization modulator temporally modulates the light on the first and second light paths to first and second output states of polarization. First and second projection lenses direct light on the first and second light paths toward a projection screen to form substantially overlapping polarization encoded images. The polarization modulator may be located before or after the projection lenses. The polarization-encoded images may be viewed using eyewear with appropriate polarization filters.

L'invention concerne un système de conversion de polarisation qui sépare la lumière provenant d'une source d'image non polarisée dans un premier état de polarisation (SOP) et un second SOP orthogonal, et qui dirige la lumière polarisée sur des premier et second trajets de lumière. Le SOP de lumière, sur un seul des trajets de lumière, est transformé en un état orthogonal, de telle sorte que les deux trajets de lumière ont le même SOP. Un modulateur de polarisation module temporellement la lumière sur les premier et second trajets de lumière vers les premier et second états de sortie de polarisation. Des première et seconde lentilles de projection dirigent la lumière sur les premier et second trajets de lumière vers un écran de projection pour former sensiblement un chevauchement d'images codées par polarisation. Le modulateur de polarisation peut être situé avant ou après les lentilles de projection. Les images codées par polarisation peuvent être vues en utilisant des articles de lunetterie pourvus des filtres de polarisation appropriés.

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