Masking for light emitting device patterns

A light emitting device comprising:

• a substrate comprising a first anode and a second anode separated by an isolation area;
• a first active layer arranged on top of the substrate, the first active layer comprising a first active area, wherein the first active area covers the first anode and extends beyond the first anode to cover at least a portion of the isolation area;
• a first electrode layer over-coating the first active area to form a first diode structure, the first diode structure adapted to emit light of a first color, wherein the first electrode layer is adapted to form a transparent interelectrode, and wherein the first active layer that extends over the portion of the isolation area serves to insulate the first electrode layer from the first anode;
• a second active layer over-coating the first diode structure so that it extends beyond the first diode structure, the second active layer comprising a second active area, wherein the second active area covers the interelectrode above the first anode and extends across the second anode;
• and
• a second electrode layer over-coating the second active area to form a second diode structure, wherein the second diode structure is adapted to emit light of a second color that is different from the first color,
• wherein each of the first and second diode structures are independently controllable via the first and second anodes to selectively emit one of:
• the second color, and a combination of the first and second colors.