Patent ID: 8317384

Claim:
A light guide comprising: a light interface surface to receive light into the light guide from a light source; top and bottom surfaces, wherein the light received through the light interface surface reflects according to total internal reflection (TIR) within the light guide between portions of the top and bottom surfaces; a surface feature pattern to disrupt the TIR and to scatter at least some of the light outside of at least one surface of the top and bottom surfaces; and a cut line to redirect at least some of the light from a first direction to a second direction within the light guide, wherein the first direction is a direction other than towards the surface feature pattern, and the second direction is a direction substantially towards the surface feature pattern according to the TIR, and wherein the cut line comprises: an elongated opening in at least one surface of the top and bottom surfaces; and a channel aligned with the elongated opening, wherein the channel forms an empty cavity which extends into the light guide toward an opposing surface, and the channel has converging sidewalls which taper from opposite sides of the elongated opening to a depth at which the sidewalls converge within the light guide, wherein the depth is less than a thickness of the light guide.