Patents by Inventor Pritish Kar

Pritish Kar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10658546
    Abstract: Simplified LED chip architectures or chip builds are disclosed that can result in simpler manufacturing processes using fewer steps. The LED structure can have fewer layers than conventional LED chips with the layers arranged in different ways for efficient fabrication and operation. The LED chips can comprise an active LED structure. A dielectric reflective layer is included adjacent to one of the oppositely doped layers. A metal reflective layer is on the dielectric reflective layer, wherein the dielectric and metal reflective layers extend beyond the edge of said active region. By extending the dielectric layer, the LED chips can emit with more efficiency by reflecting more LED light to emit in the desired direction. By extending the metal reflective layer beyond the edge of the active region, the metal reflective layer can serve as a current spreading layer and barrier, in addition to reflecting LED light to emit in the desired direction.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: May 19, 2020
    Assignee: Cree, Inc.
    Inventors: Matthew Donofrio, Pritish Kar, Sten Heikman, Harshad Golakia, Rajeev Acharya, Yuvaraj Dora
  • Patent number: 9437783
    Abstract: A light emitting device includes an active layer configured to provide light emission due to carrier recombination therein, a surface on the active layer, and an electrically conductive contact structure on the surface. The contact structure includes at least one plated contact layer. The contact structure may include a sublayer that conforms to the surface roughness of the underlying surface, and the plated contact layer may be substantially free of the surface roughness of the underlying surface. The surface of the plated contact layer may be substantially planar and/or otherwise configured to reflect the light emission from the active layer. Related fabrication methods are also discussed.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: September 6, 2016
    Assignee: Cree, Inc.
    Inventors: Pritish Kar, David Beardsley Slater, Jr., Matthew Donofrio, Brad Williams
  • Publication number: 20160211420
    Abstract: Simplified LED chip architectures or chip builds are disclosed that can result in simpler manufacturing processes using fewer steps. The LED structure can have fewer layers than conventional LED chips with the layers arranged in different ways for efficient fabrication and operation. The LED chips can comprise an active LED structure. A dielectric reflective layer is included adjacent to one of the oppositely doped layers. A metal reflective layer is on the dielectric reflective layer, wherein the dielectric and metal reflective layers extend beyond the edge of said active region. By extending the dielectric layer, the LED chips can emit with more efficiency by reflecting more LED light to emit in the desired direction. By extending the metal reflective layer beyond the edge of the active region, the metal reflective layer can serve as a current spreading layer and barrier, in addition to reflecting LED light to emit in the desired direction.
    Type: Application
    Filed: January 21, 2015
    Publication date: July 21, 2016
    Inventors: MATTHEW DONOFRIO, PRITISH KAR, STEN HEIKMAN, HARSHAD GOLAKIA, RAJEEV ACHARYA, YUVARAJ DORA
  • Publication number: 20130299858
    Abstract: A light emitting device includes an active layer configured to provide light emission due to carrier recombination therein, a surface on the active layer, and an electrically conductive contact structure on the surface. The contact structure includes at least one plated contact layer. The contact structure may include a sublayer that conforms to the surface roughness of the underlying surface, and the plated contact layer may be substantially free of the surface roughness of the underlying surface. The surface of the plated contact layer may be substantially planar and/or otherwise configured to reflect the light emission from the active layer. Related fabrication methods are also discussed.
    Type: Application
    Filed: May 8, 2012
    Publication date: November 14, 2013
    Inventors: Pritish Kar, David Beardsley Slater, JR., Matthew Donofrio, Brad Williams