Patent ID: 8909009

Claim:
A lightguide, comprising: an array of discrete regions, each region comprising a plurality of polyhedron light extractors, each extractor in each region having a base edge most proximate to and generally facing a light input location at an edge of the lightguide, the array of discrete regions comprising a first region including a first group of polyhedron light extractors arranged in a two-dimensional array with rows and columns, and a second region including a second group of polyhedron light extractors arranged in a two-dimensional array with rows and columns, and the first group of polyhedron light extractors each having the respective base edges being oriented at a first angle with respect to the edge of the lightguide, the second group of polyhedron light extractors each having the respective base edges being oriented at a second angle with respect to the edge of the lightguide, the first angle being different from the second angle.