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Fault tolerant led display design

  • US 6,650,064 B2
  • Filed: 09/07/2001
  • Issued: 11/18/2003
  • Est. Priority Date: 09/29/2000
  • Status: Expired due to Fees
First Claim
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1. For use in a light emitting diode illumination source, a circuit for tolerating failure of one light emitting diode within a series-connected group comprising:

  • two or more sets of light emitting diodes connected in series with a common forward bias orientation to form a primary current path when all light emitting diodes within each set are operating; and

    two or more devices each connected in parallel with a corresponding set of light emitting diodes, each device having a threshold voltage for conducting current which is greater than or equal to combined forward voltage drops at maximum current for all light emitting diodes within the respective set, wherein each device provides an alternate current path upon failure of any light emitting diode within the respective set.

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