×

LED lighting device and driving method for the same

  • US 8,698,425 B2
  • Filed: 03/04/2013
  • Issued: 04/15/2014
  • Est. Priority Date: 03/08/2007
  • Status: Expired due to Fees
First Claim
Patent Images

1. An LED lighting device comprising:

  • a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and

    a control circuit for generating first and second switching control signals based on a chromaticity control signal and a luminance control signal, and executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit so as to have a lighting period and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, and for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, whereinthe control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×