Light emitting device, light emitting device package, and light system

  • US 8,928,016 B2
  • Filed: 10/07/2010
  • Issued: 01/06/2015
  • Est. Priority Date: 02/01/2010
  • Status: Active Grant
First Claim
Patent Images

1. A light emitting device comprising:

  • a light emitting structure including a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer; and

    a light extraction structure including at least a first light extraction zone and a second light extraction zone, wherein a period and/or size of first concave and/or convex structures of the first light extraction zone is different from a period and/or size of second concave and/or convex structures of the second light extraction zone,wherein the first light extraction zone is separated from the second light extraction zone,wherein the light extraction structure comprises at least a third light extraction zone and a fourth light extraction zone, wherein at least the first light extraction zone, the second light extraction zone, the third light extraction zone, and the fourth light extraction zone are arranged in a matrix, andwherein the second light extraction zone has a longer period than the first light extraction zone, the third light extraction zone has a longer period than the second light extraction zone, and the fourth light extraction zone has a longer period than the third light extraction zone.

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