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Light emitting diode circuit and arrangement and device

  • US 8,076,872 B2
  • Filed: 04/20/2007
  • Issued: 12/13/2011
  • Est. Priority Date: 05/02/2006
  • Status: Active Grant
First Claim
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1. A light emitting diode circuit comprising:

  • a first sub-circuit comprising at least one first light emitting diode serially connected with a threshold voltage element, the first sub-circuit being connected to a pair of terminals, comprising a first terminal and a second terminal; and

    a second sub-circuit comprising at least one second light emitting diode serially connected with a first switch, the second sub-circuit being connected to the pair of terminals in parallel with the first sub-circuit,wherein the first switch, in a conducting state, switches on the second light emitting diode and switches off the first light emitting diode and, in a non-conducting state, switches off the second light emitting diode and switches on the first light emitting diode, andwherein the threshold voltage element is not a light emitting diode, and is configured to increase a first minimum threshold voltage of the first sub-circuit to be greater than a second minimum threshold voltage of the second sub-circuit.

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