Patents by Inventor Li-Ho Shen

Li-Ho Shen 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).

  • Backlight driving system
    Patent number: 8344650
    Abstract: A backlight driving system driving a plurality of lamp groups comprises a phase controller, a pulse width module (PWM) controller, a plurality of power stages, a plurality of transformers and a plurality of switch circuits. The phase controller generates a plurality of phase signals. The PWM controller generates PWM signals. The power stages receive and convert direct current (DC) signals from an external power source to alternative current (AC) signals under the control of the PWM signals. The transformers receive and boost up the AC signals from the power stages to drive the lamp groups. The switch circuits alternatively transmit the DC power signals from the external power source and the PWM signals from the PWM controller to the power stages so as to control outputs of the power stages.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: January 1, 2013
    Assignee: Ampower Technology Co., Ltd.
    Inventors: Li-Ho Shen, Chien-Hung Chen
  • Detecting lamp currents and providing feedback for adjusting lamp driving voltages
    Patent number: 7847493
    Abstract: A lamp current of a lamp with at least one high-voltage end is detected using a current detector connected to the high-voltage end of the lamp. A feedback signal according to the lamp current is generated, and a drive voltage to the lamp is adjusted according to the feedback signal.
    Type: Grant
    Filed: June 9, 2006
    Date of Patent: December 7, 2010
    Assignee: Chimei Innolux Corporation
    Inventors: Li-Ho Shen, Yu-Lin Liu
  • BACKLIGHT DRIVING SYSTEM
    Publication number: 20100156306
    Abstract: A backlight driving system driving a plurality of lamp groups comprises a phase controller, a pulse width module (PWM) controller, a plurality of power stages, a plurality of transformers and a plurality of switch circuits. The phase controller generates a plurality of phase signals. The PWM controller generates PWM signals. The power stages receive and convert direct current (DC) signals from an external power source to alternative current (AC) signals under the control of the PWM signals. The transformers receive and boost up the AC signals from the power stages to drive the lamp groups. The switch circuits alternatively transmit the DC power signals from the external power source and the PWM signals from the PWM controller to the power stages so as to control outputs of the power stages.
    Type: Application
    Filed: October 22, 2009
    Publication date: June 24, 2010
    Applicant: AMPOWER TECHNOLOGY CO., LTD.
    Inventors: LI-HO SHEN, CHIEN-HUNG CHEN
  • Detecting lamp currents and providing feedback for adjusting lamp driving voltages
    Publication number: 20060284575
    Abstract: A lamp current of a lamp with at least one high-voltage end is detected using a current detector connected to the high-voltage end of the lamp. A feedback signal according to the lamp current is generated, and a drive voltage to the lamp is adjusted according to the feedback signal.
    Type: Application
    Filed: June 9, 2006
    Publication date: December 21, 2006
    Inventors: Li-Ho Shen, Yu-Lin Liu