Patent ID: 8390008

Claim:
A light-emitting device, comprising: (a) a substrate; (b) a plurality of LED elements formed over the substrate, each LED element including a transparent or semi-transparent electrode, a reflective electrode, and one or more layers, at least one of which is light-emitting, formed between the transparent or semi-transparent electrode and reflective electrode, the transparent or semi-transparent electrode and reflective electrode defining a single, controllable light-emitting area, whereby the plurality of LED elements comprise a plurality of different light-emitting materials, wherein the plurality of LED elements emit light into a waveguide defined by the respective transparent or semi-transparent electrode, reflective electrode, and the one or more layers; and (c) one or more first topographical features and one or more second topographical features different from the first topographical features formed over the substrate throughout at least one LED element, and within a single, controllable light-emitting area, wherein the first and second topographical features disrupt the waveguiding of light within the single, controllable light-emitting area to increase the emission of light in at least one direction, and wherein the first or second topographical features are either indentations or extrusions.