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LED having angled sides for increased side light extraction

  • US 6,570,190 B2
  • Filed: 12/06/2000
  • Issued: 05/27/2003
  • Est. Priority Date: 06/03/1997
  • Status: Expired due to Term
First Claim
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1. A light-emitting diode structure comprising:

  • a multi-layer heterostructure, including a window portion and an active layer for generating light, said multi-layer heterostructure having a substantially flat surface for emitting light, said window portion being substantially transparent and having at least portions of one or more sides of said window portion at an oblique angle with respect to said substantially flat surface, wherein said oblique angle is selected to increase the amount of light escaping from said sides of said window portion and wherein a surface of said active layer has an area greater than an area of a surface of said window portion facing away from said active layer, wherein a thickness of said window portion is equal to or greater than 50 microns, and wherein said oblique angle is equal to or greater than 20 degrees, said oblique angle being measured as an angle between an outer surface of said one or more sides of said window portion and a direction normal to said substantially flat surface , wherein a primary light output service of said diode is other than a surface of said window portion.

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