High power led lamp

  • US 6,346,771 B1
  • Filed: 11/19/1998
  • Issued: 02/12/2002
  • Est. Priority Date: 11/19/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. An LED lamp for generating incoherent visible light, comprising:

  • a non-semiconductor member;

    a semiconductor structure formed over said non-semiconductor member and comprising lower and upper inorganic semiconductor layers of opposite conductivities and an active region generating LED light, said semiconductor structure having bottom and top faces and outer side faces (25);

    a non-semiconductor part passing light out of one of said bottom and top faces;

    at least one metal conductor electrically connected with said upper semiconductor layer;

    a plurality of cavities in said semiconductor structure each extending from said top face into said semiconductor structure and each containing a metal part that is in electrical Contact with said lower semiconductor layer and that is distant from said outer side faces;

    said semiconductor structure having a several light-extraction surfaces (26) arranged for harvesting light from the semiconductor structure;

    said light extraction surfaces being distant from said outer side faces and inclined to said semiconductor layers, LED light propagating in the semiconductor structure being diverted at said light-extraction surfaces for output from the semiconductor structure; and

    electrical interconnection for causing the metal parts in said cavities to pass current simultaneously when the lamp is turned on.

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