LIGHT COLLECTING AND COLLIMATING LIGHT GUIDES (WAVEGUIDES)
Planar-type light guides that concentrate and collimate light. The light guides employ a lens arrays that shapes the light beam according to a prescribed angular pattern. In illumination applications, the collimating light guides can be designed to redistribute light from a light source, such as an LED strip, and emit a uniform directional beam from the broad surface of the light guide. In light harvesting applications, the light guide can be designed to collect light from its broad-area surface and concentrate on an edge or any prescribed location of the light guide. Such light guides are ideal for making flat illumination panels or backlights with enhances brightness as well as efficient radiation collectors with ultra-thin form factors.