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LIGHT EMITTING DIODE DRIVING CIRCUIT, AND DISPLAY DEVICE HAVING THE SAME

  • US 20120127214A1
  • Filed: 09/23/2011
  • Published: 05/24/2012
  • Est. Priority Date: 11/18/2010
  • Status: Abandoned Application
First Claim
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1. A light-emitting-diode (LED) driving circuit, comprising:

  • a current driving circuit configured to control current signals flowing through LED strings;

    a level detector configured to detect a minimum detection voltage signal having a minimum voltage level among voltage signals of first terminals of the respective LED strings;

    a comparing circuit configured to generate a first comparison output signal and a second comparison output signal based on a headroom-control reference voltage and the minimum detection voltage signal;

    a digital control circuit configured to adjust a duty ratio of a gate control signal in a digital mode based on the first comparison output signal, the second comparison output signal and a control clock signal; and

    a power supply circuit configured to generate an LED driving voltage in response to the gate control signal.

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