An illumination engine for a projection display using a...

G - Physics – 03 – B

Patent

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G03B 21/28 (2006.01) F21V 8/00 (2006.01) G02B 27/00 (2006.01) G02B 27/09 (2006.01) G02B 27/28 (2006.01)

Patent

CA 2435400

An illumination engine for a projection display using a tapered light pipe(718) including a reflector having first and second focal points. A source of electro-magnetic radiation disposed proximate to the first focal point of the reflector emits rays of radiation that reflect from the reflector toward the second focal point. A tapered light pipe(718) collects and transmits substantially all of the radiation converged at the second focal point(722), adjusting the numerical aperture of the radiation, but curving the surface formed by the images of the radiation. A straight light pipe(724) or a lens collects and transmits substantially all of the radiation transmitted by the tapered light pipe , flattening the surface formed by the images of the radiation. A condenser lens(707) collects and transmits all of the radiation transmitted by the contoured delay element to a polarizing beam splitter(740) and a projection system (738).

L'invention concerne un moteur d'éclairage pour affichage de projection utilisant un TLP équipé d'un réflecteur comprenant un premier point focal et un second point focal. Une source de rayonnement électromagnétique située près du premier point focal du réflecteur émet des rayons de rayonnement réfléchissant du réflecteur vers le second point focal. Un TLP reçoit et transmet sensiblement tous les rayonnements convergeant vers le second point focal, réglant l'ouverture numérique du rayonnement, mais courbant la surface formée par les images du rayonnement. Un SLP ou une lentille reçoivent et transmettent sensiblement tous les rayonnements émis par le TLP, aplatissant la surface formée par les images du rayonnement. Une lentille de champ collectif reçoit et transmet sensiblement tous les rayonnements émis par le circuit à retard profilé à un PSB et à un système de projection.

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