Patent ID: 8017955
Filing Date: 2011-09-13
Classification: H01L

Abstract:
1. A composite multi-color light emitting diode comprising a first light emitting diode unit and a second light emitting diode unit, each light emitting diode unit having an upper surface and a lower surface and being operative to emit light of a first wavelength and a second wavelength, respectively, through its upper surface; wherein the lower surface of the second light emitting diode unit is arranged on the upper surface of the first light emitting diode unit, the second light emitting diode unit occupying a fraction of the upper surface of the first light emitting diode unit leaving exposed a remainder of the of the upper surface of the first light emitting diode unit, wherein light of the second wavelength is emitted through the upper surface of the second light emitting diode, wherein light of the first wavelength is emitted through the remainder, wherein said upper surface of said first light emitting diode unit and said lower surface of said second light emitting diode unit comprise electrically interconnected electrodes that are operative to provide a driving current across the respective light emitting diode unit, and wherein said first light emitting diode unit is electrically connected in series with said second light emitting diode unit for being simultaneously driven using only two bond wires, wherein the electrically interconnected electrodes comprise an upper electrode on the upper surface of the first light emitting diode unit and a lower electrode on the lower surface of the second light emitting diode unit, and wherein the upper electrode is aligned with the lower electrode to form a single contact point for receiving one the of two bond wires.