Patent ID: 8014066

Claim:
A reflection-type projection screen comprising: a) a dual-purpose light reflective, supportive substrate having a front surface and rear surface comprising at least one unpigmented flash-spun plexifilamentary film-fibril sheet having a thickness between about 5 mils and about 15 mils and having a light reflectance of greater than about 85% and a gloss of less than about 10% when measured at a 60° incident angle; and b) an optical diffusion layer covering the front surface of the substrate having a thickness between about 0.2 mil and about 15 mils comprising a light transmissive melt-processible polymer containing diffusion-enhancing particles; wherein the projection screen has an optical gain of between about 0.90 and about 2.0 and wherein the optical gain deviates by no more than about 8% over viewing angles between −60° and +60°.