Patents by Inventor Hung-Ching Li

Hung-Ching Li has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Color control method for LED lighting systems
    Patent number: 7719208
    Abstract: When temperature variation occurs to the LED dice of an LED lighting system, a feedback control mechanism is applied to compensate temperature-related wavelength shift for precisely controlling the light generated by the LED dice based on the voltage drop variation or current variation of the LED dice. The color control method for the LED lighting system includes a preliminary detection phase and a feedback control phase. In the preliminary detection phase, voltage drop signals or current signals together with corresponding color and hue signals of each LED module of the LED lighting system are detected. In the feedback control phase, signal compensating processes are performed to precisely control the light generated by the LED lighting system based on the voltage drop variation or the current variation in conjunction with the corresponding color and hue signals generated in the preliminary detection phase.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: May 18, 2010
    Assignee: AU Optronics Corp.
    Inventors: Yueh-Han Li, Po-Tang Hsu, Chien-Ming Ko, Hung-Ching Li
  • COLOR CONTROL METHOD FOR LED LIGHTING SYSTEMS
    Publication number: 20090153075
    Abstract: When temperature variation occurs to the LED dice of an LED lighting system, a feedback control mechanism is applied to compensate temperature-related wavelength shift for precisely controlling the light generated by the LED dice based on the voltage drop variation or current variation of the LED dice. The color control method for the LED lighting system includes a preliminary detection phase and a feedback control phase. In the preliminary detection phase, voltage drop signals or current signals together with corresponding color and hue signals of each LED module of the LED lighting system are detected. In the feedback control phase, signal compensating processes are performed to precisely control the light generated by the LED lighting system based on the voltage drop variation or the current variation in conjunction with the corresponding color and hue signals generated in the preliminary detection phase.
    Type: Application
    Filed: January 31, 2008
    Publication date: June 18, 2009
    Inventors: Yueh-Han Li, Po-Tang Hsu, Chien-Ming Ko, Hung-Ching Li