Patent ID: 8810503

Claim:
A light source comprising: a light-emitting layer operative to emit light in response to an electrical potential difference being applied across the light-emitting layer, emitted light having an intensity dependent upon a magnitude of the potential difference; a first electrode structure comprising a first electrically-conductive electrode on a first face of the light-emitting layer; a second electrode structure comprising a layer of a potential-distributing material having an electrical resistance on a second face of the light-emitting layer and an array of control points in electrical contact with the layer of potential-distributing material at locations spaced apart over the second face of the light-emitting layer; and a power supply having a plurality of independently-controllable outputs, the outputs each connected to a corresponding one of the control points; and wherein the control points have a non-uniform spatial density and the control points are concentrated more densely in a central region of the light-emitting layer and less densely in a peripheral region of the light-emitting layer.