Patent ID: 8608363
Filing Date: 2013-12-17
Classification: F21K,F21V,G02B,G02F

Abstract:
1. A backlight, comprising: a front and back reflector forming a hollow light recycling cavity, the front reflector being partially transmissive to provide an output illumination area, and wherein the front reflector has a reflectivity for p-polarized light that is: (1) constant, or (2) increases, with angle of incidence, and a transmission that generally decreases with angle of incidence; a component that provides the cavity with a desired balance of specular and diffuse characteristics, the component being characterized by a transport ratio greater than 15% at a 15 degree incidence angle and less than 95% at a 45 degree incidence angle, wherein the front or back reflectors can be or include the component, or the component can be distinct from the front and back reflectors; and one or more light source members disposed to emit light into the light recycling cavity over a limited angular distribution; wherein the front reflector has a hemispherical reflectivity for unpolarized visible light of R