Various embodiments comprise light recycling films comprising an array of parallel ridges and grooves that form prisms that selectively reflect or transmit light. In some embodiments, the light recycling film may be used in displays that include spatial light modulators comprising a plurality of pixels....http://www.google.ca/patents/US20070091616?utm_source=gb-gplus-sharePatent US20070091616 - Light enhancing structures with multiple arrays of elongate features of varying characteristics
