Light-emitting diode having a surface electrode of a tree-like form
Patent 5309001 Issued on May 3, 1994. Estimated Expiration Date: 
November 24, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 24, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesElectrical contact for an LED Light-emitting diode having light reflecting layer Patent #: 5132750 Inventors
ApplicationNo. 980666 filed on 11/24/1992US Classes:257/99, With housing or contact structure257/91, With shaped contacts or opaque masking257/778, Flip chip257/E33.065Characterized by shape (EPO)ExaminersPrimary: Hille, RolfAssistant: Tran, Minh Loan Attorney, Agent or FirmForeign Patent References
International ClassH01L 033/00Foreign Application Priority Data1991-11-25 JPAbstractA surface electrode on a surface of a LED has a pad, and further, at least first-order branches linearly extending from the pad, second-order branches diverged and linearly extending from the first-order branches, and third-order branches diverged and linearly extending from the second-order branches. The pad out of the surface electrode is not in electrical contact with a underlying semiconductor layer, whereas the surface electrode and the semiconductor layer are in electrical contact with each other at ends of the highest-order branches. Also, the semiconductor layer is provided along a pattern of the surface electrode in a mesa shape. Thus, ineffective light emission underneath the surface electrode is relatively reduced so that external quantum efficiency can be improved, and moreover even shorter-wavelength light can be allowed to go out at high efficiency by omitting a current diffusion layer.Other References
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