Transparent screen and projection display apparatus

Details Transparent screen and projection display apparatus Transparent screen and projection display apparatus

G - Physics

03

B

G03B 21/62 (2006.01) G03B 21/10 (2006.01)

Patent

CA 2474463

A transparent screen includes a refraction total reflection panel of Fresnel lens shape having a saw-toothed plane of incidence where a projection light is incident and a plane of output from where the projection light goes out and an image formation display panel where an image is formed from the light incoming from the refraction total reflection panel so as to obtain a projected image. The plane of incidence of the refraction total reflection panel has a plurality of refraction slopes for refracting and advancing the projected light, a plurality of transparent slopes for transmitting the projected light, and a total reflection plane for reflecting the light which has transmitted through the transparent slopes, which are coaxially formed. The refraction total reflection panel is formed from a transparent material in which scattered particles are not dispersed.

L'invention concerne un écran transparent comprenant, d'une part, un panneau à réflexion totale ayant la forme d'une lentille de Fresnel possédant un plan d'incidence en dent de scie exposé à une lumière projetée et un plan de sortie à partir duquel la lumière projetée quitte le panneau, et, d'autre part, un panneau d'affichage sur lequel une image est formée à partir de la lumière provenant du panneau à réflexion totale. Le plan d'incidence du panneau à réflexion totale comporte une pluralité de reliefs de réfraction servant à réfléchir et à acheminer la lumière projetée, une pluralité de reliefs transparents servant à transmettre la lumière projetée, et un plan à réflexion totale servant à réfléchir la lumière transmise par les reliefs transparents, formés de façon coaxiale. Le panneau à réflexion totale est formé d'un matériau transparent dans lequel les particules diffusées ne sont pas dispersées.

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