Patent ID: 9534746
Date: 2017-01-03
CPC Classifications: F21K,G02F,G09F

Claim:
1. A light distribution system to produce a smoothly varying Lambertian luminance output on an output surface that emits light in a frontward direction towards the viewer, in one or more directions perpendicular to the frontward direction to form a two dimensional array of unit cells, each unit cell comprising: a. a rear optical cavity further comprising: b. a baffled diffusion cavity adjacent the rear optical cavity, the baffled diffusion cavity further comprising: c. a non-baffled diffusion cavity adjacent to the baffled diffusion cavity, the non-baffled diffusion cavity further comprising: wherein the transmission function T(x,y) is predetermined by a deterministic ray trace or an experimental optimization to minimize the visual perception of dis-uniformity arising from the combination of dis-uniform light output, dis-uniform linear gradient light output variation, and dis-uniform quadratic gradient light output variation; and wherein the baffled diffusion cavity includes baffles with a first inner diffuse reflector layer and a second outer retro-reflective layer.