Patent ID: 8218236
Filing Date: 2012-07-10
Classification: G03B

Abstract:
1. A projection screen, comprising: a base sheet having a first side and a second side opposite to the first side, wherein a plurality of first surfaces and a plurality of second surfaces are formed on the first side, each of the first surfaces faces an optical projection system, each of the second surfaces is disposed between two adjacent first surfaces and forms an angle with respect to a neighboring first surface; a surface roughness structure formed on at least the first surfaces and capable of diffusing a light beam emitted by the optical projection system to a limited extent; a reflective layer formed on the surface roughness structure and capable of reflecting most of the light beam diffused by the surface roughness structure to a limited extent towards a limited viewing cone, wherein a half-intensity angle of the light beam diffused by the surface roughness structure is smaller than or equal to 30 degrees; and a light absorption layer formed on the second surfaces.