| 摘要 |
An illumination apparatus comprises: (a) at least one light source; (b) a light guide for accepting light from the at least one light source and for guiding the light using total internal reflection, the light guide having a top surface; (c) a light extracting film having an input surface optically coupled with the top surface and an output surface for providing light, wherein the input surface comprises a plurality of features which are optically coupled to the top surface of the light guide, each feature having: (i) a first side comprising two or more planar segments; and (ii) a second side comprising two or more planar segments, and wherein the first and second sides intersect at an apex.
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