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Light-emitting element driving device

  • US 9,237,627 B2
  • Filed: 09/25/2014
  • Issued: 01/12/2016
  • Est. Priority Date: 06/09/2009
  • Status: Active Grant
First Claim
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1. A light-emitting element driving device for driving a plurality of light-emitting element strings connected in parallel, the light-emitting element driving device comprising:

  • a failure detector that monitors voltages at the plurality of light-emitting element strings, and detects a failure of each light-emitting element string of the plurality of light-emitting element strings;

    a drive current controller that generates a plurality of drive current control signals; and

    a plurality of drive current generators, each drive current generator of the plurality of drive current generators supplying a drive current to a corresponding one of the plurality of light-emitting element strings based on a corresponding one of the plurality of drive current control signals; and

    a minimum detector that detects a minimum voltage of the voltages at the plurality of nodes and outputs a certain voltage which represents the minimum voltage, whereineach of the plurality of drive current generators independently adjusts a drive current of the corresponding one of the plurality of light-emitting element strings.

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