Patent ID: 9632353
Date: 2017-04-25
CPC Classifications: G02B,G02F

Claim:
1. A backlight light guide, comprising: a light guide layer having a first major surface that has formed therein a spaced array of extractors, and a second major surface opposite the first major surface, a backside reflective layer disposed on the first major surface of the light guide layer, wherein the backside reflective layer comprises a polarization-preserving specular reflector, a low refractive index coupling layer having a first major surface disposed on the second major surface of the light guide layer, wherein the low refractive index coupling layer comprises a second major surface opposite the first major surface thereof, a reflective polarizer disposed on the second major surface of the low refractive index coupling layer, wherein the reflective polarizer provides recycling of unused light, and a quarter wave film layer between the backside reflective layer and the reflective polarizer; wherein the backlight light guide provides a gain of at least 80%; and wherein there is no air boundary directly on either major surface of the light guide layer.