Projection screen

Abstract

Abstract This is a material developed for use as a front surface projection screen. It consists of three elements: the first being a milky white translucent plastic film, the second being very fine ''''hairline'''' striations on the back surface (that which is opposite the surface nearest to the projection source) of the film in a random pattern evenly covering the entire surface and the third element is a highly reflective metallized coating (vacuum plated aluminum) on the back surface. The purpose of the first element is to provide a matte white surface on which an image can be formed by the light projected onto it from the projection source, the fact that it is translucent rather than opaque allows the second and third elements to function as follows. The striations on the back surface of the film serve to disperse the reflected cone of light in a wide horizontal angle (approximately 110* ) and a narrow vertical angle (approximately 30* ). The purpose of the reflective coating on the back surface is to return more of the light projected to the film than would be returned if the film were an opaque white material. The screen material can be used in a number of different ways such as the traditional roll-up screens, grommeted along the edges and laced to a frame made of tubing, or utilizing any suitable rigid frame that holds the screen in a flat panel presenting a soft surface (if you push it with a finger, it dimples and returns to flat), or in any other suitable manner either flat or curved or any other shape. It is desirable that in use the screen be kept as flat as possible in order to provide an undistorted projection surface.

Inventors

• 👤 E Martinez

Bibliographic Details