×

Electrical compensation and fault tolerant structure for light emitting device array

  • US 20070215854A1
  • Filed: 03/04/2007
  • Published: 09/20/2007
  • Est. Priority Date: 03/03/2006
  • Status: Active Grant
First Claim
Patent Images

1. An apparatus comprisinga plurality of light emitting elements grouped in at least a string and connected in series wherein;

  • each said light emitting element comprising a first end and a second end;

    each of said light emitting element operating to emit light at or above a first onset voltage by conducting an electrical current;

    wherein said apparatus further comprises at least a voltage control devices;

    wherein said voltage control device operates in a low impedance state or a high impedance state according to the terminal voltage difference between said first end and second end of at least one said light emitting element;

    wherein said voltage control device operates in a high impedance state when said voltage difference is between zero and a first breakover voltage, and operates in a low impedance state when said terminal voltage difference reaches or exceeds said first breakover voltage;

    wherein said voltage control device conducts negligible amount of current in said high impedance state compared to the current in said light emitting element;

    wherein said voltage control device provides at least a current path parallel to at least a said light emitting device when in its low impedance state.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×