Patent ID: 8373821

Claim:
A light guide system comprising: a cover layer; and a light guide body comprising a plurality of surface relief features extending into the light guide body, the surface relief features comprising a plurality of angled facets, wherein, in a cross-sectional side view, the plurality of angled facets comprises at least two facets coated with a reflective coating at opposing sides of the surface relief features; wherein the cover layer and light guide body are configured to guide light therein, and wherein the cover layer is disposed adjacent to the plurality of the surface relief features such that a plurality of cavities are formed between the cover layer and the light guide body by a substantially planar surface of the cover layer and substantially all the surface relief features disposed between the cover layer and the light guide body, wherein, in a cross-sectional side view, each surface relief feature is substantially symmetric about an axis perpendicular to the planar surface of the cover layer, wherein the light guide body is thicker than the cover layer, and wherein each angled facet is substantially non-perpendicular to the planar surface of the cover layer.