G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 27/18 (2006.01) G02B 27/28 (2006.01) G09G 3/02 (2006.01)
Patent
CA 2233597
A projection display system includes a thin film polarizing beam splitter/combiner has first and second light transmissive substrate in the form of prisms and a plurality of thin film layers disposed between the prisms. The thin film layers have predetermined thicknesses and refractive indices which allow unpolarized incident light to be separated into s-polarized and p-polarized light beams. Both frustrated total internal reflection and thin film interference are simultaneously employed to allow s-polarized light to be transmitted and p-polarized light to be reflected over a wide range of wavelengths and angles of incidence. The device further includes two spatial light modulators for encoding an image to be projected. By providing a different signal to each spatial light modulator, a three-dimensional display results.
Dispositif d'affichage de projection comprenant un diviseur/combineur de faisceau de polarisation à couche mince comportant un premier et un deuxième substrats transmettant la lumière sous forme de prismes, ainsi qu'une pluralité de couches minces situées entre les prismes. Ces couches minces possèdent des épaisseurs prédéterminées et des indices de réfraction permettant de séparer la lumière en faisceaux lumineux s-polarisés et p-polarisés. On utilise simultanément à la fois la réflexion intérieure totale frustrée et l'interférence des couches minces, de manière à permettre la transmission de la lumière s-polarisée et la réflexion de la lumière p-polarisée sur une plage importante de longueurs d'ondes et d'angles d'incidence. Ce dispositif comprend, de plus, deux modulateurs de lumière spatiaux servant à coder une image à projeter. On obtient un affichage tridimensionnel en appliquant un signal différent à chaque modulateur spatial.
Dobrowolski Jerzy A.
Li Li
Sullivan Brian Thomas
Marks & Clerk
National Research Council Of Canada
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