Led backlight source and operation thereof

Led backlight source and operation thereof

  • CN 101,384,120 B
  • Filed: 11/05/2008
  • Issued: 09/10/2014
  • Est. Priority Date: 11/07/2007
  • Status: Active Grant
First Claim
Patent Images

1. a method of operation, is applicable to a back light source in LED, and this back light source in LED has multiple light-emitting diodes pipeline { S i, wherein i=1,2,3 ... N, and N is positive integer, each this light-emitting diodes pipeline S ihave spatially multiple redness, green and the blue LED arranged regularly, described redness, green and the blue LED electric property coupling of each type together and receive a drive current C iZ, and according to this drive current C iZlaunch the light of a Z color, Z=redness, green or blueness, this method of operation comprises:

  • A. provide a corresponding drive current C by a pulse width modulation device igive described light-emitting diodes pipeline { S ieach so that described light-emitting diodes pipeline { S ieach emission of light, wherein, this drive current C icomprise three electric current C iR, C iG, and C iB, to drive respectively described redness, green and the blue LED of each type;

    B. measure respectively by this light-emitting diodes pipeline S iin the intensity I of the light launched of described redness, green and the blue LED of each type iR, I iG, and I iB;

    C. to this light-emitting diodes pipeline S ijudge;

    F iZ

    (I iZ/gateD)*Z_duty;

    Chr iZ=F iZ/ (F iR+ F iG+ F iB);

    And Bri i

    (F iR+F iG+F iB)*GAIN Wherein, F iZrepresent luminous flux, the Chr of this Z color iZrepresent colourity, the Bri of this Z color irepresent this light-emitting diodes pipeline S ibrightness, gateD represent that work period, the Z_duty of a gate control signal represent this electric current C iZwork period, GAIN represent a gain and Z=redness, green or blueness;

    D. this light-emitting diodes pipeline S that relatively judgement obtains ithe colourity of the light of launching and brightness and this light-emitting diodes pipeline S ilight one with reference to colourity and brightness;

    E. adjust and offer this light-emitting diodes pipeline S ithis drive current C i, to make this light-emitting diodes pipeline S ithe colourity of the light of launching and brightness are equal to this light-emitting diodes pipeline S ithis of light with reference to colourity and brightness;

    And F. to described light-emitting diodes pipeline { S iin remaining each repeating said steps b-e, to make described light-emitting diodes pipeline { S ithe light of transmitting has in fact colourity and brightness in fact uniformly uniformly.

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