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Voltage controlled backlight driver

  • US 7,969,430 B2
  • Filed: 02/19/2007
  • Issued: 06/28/2011
  • Est. Priority Date: 02/23/2006
  • Status: Expired due to Fees
First Claim
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1. A system for powering and controlling a light emitting diode (LED) light, the system comprising:

  • a control circuitry;

    a controllable power source responsive to said control circuitry; and

    a plurality of LED strings receiving power from said controllable power source,said control circuitry arranged to control the output voltage of said controllable power source responsive to a selectable one of;

    an electrical characteristic of the LED string of said plurality of LED strings exhibiting the lowest voltage drop;

    an electrical characteristic of the LED string of said plurality of LED strings exhibiting the mean voltage drop;

    an electrical characteristic of the LED string of said plurality of LED strings exhibiting the substantially arithmetic average voltage drop of said plurality of LED strings; and

    the arithmetic average of the voltage drops of said plurality of LED strings.

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