Projection screen is a square or rectangular device on which motion pictures, slides, or other media presentations are shown. It displays an enlargement of projected images. Projection screens vary greatly in size. This article discusses portable screens. Such screens are typically stored in a roll inside a metal case. The case is mounted on a tripod, and the screen is pulled down like a window shade for projection. For information on the large, permanently mounted screens used in motion-picture theaters, see Motion picture (The screen) .
Most portable screens are made of fabric or vinyl and measure 50, 60, or 70 inches (127, 152, or 178 centimeters) square. Screens are classified by their surface. Glass-beaded screens are covered with tiny beads that provide a bright image when viewed from the center of a room. Thin, curved ridges on the surface of a lenticular screen provide a sharp, bright image from any viewing angle. Matte screens are dull white and provide sharpness and a wide viewing angle, but less brightness than the other types of screens.
