摘要 |
A light-emitting device, including a substrate (10); a LED element (11) formed over the substrate including a transparent or semi-transparent electrode (12), a reflective electrode (16), and one or more layers (14), 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 (22), wherein the LED element emits light into a waveguide (13) defined by the transparent or semi-transparent electrode, reflective electrode, and the one or more layers,- and one or more first topographical features (40) and one or more second topographical features (42) different from the first topographical' features formed over the substrate within the 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. |