LIGHT GUIDE WITH EMBEDDED FRESNEL REFLECTORS

摘要

This disclosure provides systems, methods and apparatus for an optical system including a light guide and a plurality of angled slots. The angled slots are defined by undercuts in the light guide and are filled with a filler material having a refractive index that is mismatched with the refractive index of the light guide material by about 0.3 or less. The angled slots are configured to eject light out of the light guide principally by Fresnel reflections. Layers formed of the filler material can be disposed along each of the bottom and top major surfaces of the light guide. In some implementations, the light guide is attached to a light source. The light source emits light that is injected into the light guide and the angled slots redirect the light out of the light guide toward a desired target. In some implementations, the target is a display.