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Thin flash or video recording light using low profile side emitting LED

  • US 9,046,634 B2
  • Filed: 06/14/2007
  • Issued: 06/02/2015
  • Est. Priority Date: 06/14/2007
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a side-emitting, none-lasing light emitting diode (LED) die, the LED die comprising;

    a first semiconductor layer of a first type;

    a second semiconductor layer of a second type;

    an active layer between the first semiconductor layer and second semiconductor layer, the active layer having a major surface;

    a first electrode in contact with the semiconductor layer;

    a second electrode in contact with the second semiconductor layer, the first electrode and the second electrode being on a first side of the LED die so that the LED die is a flip chip;

    a second side of the LED die, opposite the first side of the LED die, wherein a growth substrate has been removed from the second side;

    a uniform reflective film formed on the second side of the LED die without an air gap between the LED die and the reflective film, the reflective film forming a reflector substantially parallel to the major surface of the active layer, such that all light impinging on the reflector is redirected back into the LED die, the LED die only emitting light from its sides, wherein no lens is employed for causing the LED die to emit all of its light from its sides;

    a solid light guide having a top surface through which light is emitted, the light guide having a cavity, of approximate dimensions as the LED die, in which the side-emitting LED die is positioned, whereby light emitted from the sides of the LED die is optically coupled into the light guide;

    a reflector layer on a bottom surface of the light guide and covering the cavity;

    a reflector around side walls of the solid light guide;

    a submount supporting the LED die;

    a metal support structure, connected to the submount and the light guide, that acts as a heat sink for the LED die;

    a driver electrically connected to the first electrode and the second electrode of the LED die for supplying power to the led die to illuminate a subject for recording an image of the subject; and

    a camera, the LED die and driver being mounted within the camera,wherein the first side of the LED die faces the same direction as the top surface of the light guide, and wherein the submount and the metal support structure are located above the top surface of the light guide.

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