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LED array control circuit with voltage adjustment function and driver circuit and method for the same

  • US 20110204797A1
  • Filed: 05/24/2010
  • Published: 08/25/2011
  • Est. Priority Date: 02/25/2010
  • Status: Active Grant
First Claim
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1. An LED array control circuit with voltage adjustment function, for controlling an LED array which includes multiple LED strings, each LED string having multiple LED devices connected in series;

  • each LED string having a first end and a second end, and all the first ends being coupled to a common node, the LED array control circuit comprising;

    a first power supply circuit coupled to the common node for providing a supply voltage to the LED array; and

    an LED driver circuit for controlling current through each LED string, the LED driver circuit including;

    multiple current sources corresponding to the multiple LED strings respectively, each current source having a first end and a second end, wherein the first end of each current source is coupled to the second end of a corresponding LED string; and

    a voltage adjustment circuit for adjusting a voltage of the second end of a corresponding current source according to a signal indicating a voltage drop across the corresponding LED string.

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