IMPROVED ONE-PIECE PROJECTION SCREEN

摘要

A one-piece projection screen (300) having improved overall efficiency and contrast, and eliminating corner illumination deficiencies and undesirable image artifacts. The optical power of the screen is divided between two or more surfaces (302, 310) acting as Fresnel lenses, and the region (309) or medium separating the surfaces has a different index of refraction (n1) than that of the mediums upstream (n) or downstream (n2) of the surfaces. The preferred embodiment of the projection screen includes a diffuser (316) coupled immediately downstream of the surfaces and a lenticular array (320).