| 摘要 |
<p>A projection screen assembly including a projection screen having an illuminated rear side and a light dispersing front side for showing an image with substantially homogeneous luminosity over a wide viewing angle. The light dispersing front side includes a plurality of closely positioned, substantially parallel and, in the use position of the screen, vertically extending lens elements including two inclined reflecting lens crests, and an intermediate lens. The projection screen is characterized by first and second reflecting rib lenses having planes of symmetry inclined toward each other or away from each other, respectively, and a third reflecting rib lens having a plane of symmetry which is normal to the plane of the screen. The use of a plurality of lenses that are approximately identical, but having different inclinations, provide enhanced homogenous luminosity.</p> |
