Transmission screen and projection display

G - Physics – 03 – B

Patent

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Details

G03B 21/00 (2006.01) G03B 21/62 (2006.01)

Patent

CA 2459939

A transmission screen comprising a refraction total-reflection Fresnel lens plate (10C), a stray light removing plate (20) composed of a condenser lens array (21) in which unit lenses are arrayed in a periodic structure in the vertical direction on an incident surface of a transmissive substrate (22) and a black stripe (23) in which transparent parts (201) each disposed in the vicinity of a focal point of each unit lens and an opaque parts (200) each disposed in the vicinity of the focal point of each unit lens are alternately arrayed in a periodic structure in the vertical direction on an output surface of the transmissive substrate (22), and an image formation display plate (30) composed of a lenticular lens (31) in which unit lenses are arrayed in a periodic structure in the horizontal direction on the incident surface of the transmissive substrate (32) for scattering the luminous flux by the scattering characteristic.

L'invention concerne un écran de transmission comprenant une plaque à lentille de Fresnel à réflexion totale (10c) et une plaque de suppression de lumière parasite (20) constituée par un réseau de lentilles de condenseur (21) comprenant des lentilles unitaires agencées verticalement dans une structure périodique sur une surface incidente d'un substrat transmissif (22), et par une bande noire (23) dans laquelle des parties transparentes (201) disposées chacune au voisinage d'un point focal de chaque lentille unitaire ainsi que des parties opaques (200) disposées chacune au voisinage du point focal de chaque lentille unitaire sont agencées verticalement en alternance dans une structure périodique sur une surface de sortie du substrat transmissif (22). Cet écran comprend également une plaque d'affichage de formation d'image (30) constituée par une lentille lenticulaire (31) comprenant des lentilles unitaires agencées horizontalement dans une structure périodique sur la surface incidente du substrat transmissif (32) et permettant la diffusion du flux lumineux selon une caractéristique de diffusion.

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