Patents by Inventor Hyung-Sang Lee

Hyung-Sang Lee 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).

  • Display device
    Patent number: 11967267
    Abstract: Provided is a display device including a display panel, an optical sensor, a timing controller, a scan driver, a data driver, and an image controller. The timing controller controls an image refresh rate of the display panel based on a refresh rate control signal. Thus, the display device provides improved visibility.
    Type: Grant
    Filed: May 2, 2023
    Date of Patent: April 23, 2024
    Assignees: Samsung Display Co., Ltd., UNIST (Ulsan National Institute Of Science and Technology)
    Inventors: Hyo Sun Kim, Oh Sang Kwon, Seong Gyu Choe, Chang Yeong Han, Min Kyung Kim, You Ra Kim, Eun Jung Lee, Hyung Suk Hwang
  • Power factor compensation device for motor driving inverter system
    Patent number: 6507167
    Abstract: The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of an utility alternating current power, and outputs a driving signal corresponding to a plurality of sine wave form voltage values stored in a memory according to a detection result, when the zero crossing point of the utility alternating current power is detected in a state where the plurality of sine wave form voltage values corresponding to a voltage of the utility alternating current power and frequencies are stored in the memory. A switching transistor is switched according to the driving signal, and the voltage applied to the inverter is switched according to the switching operation, thereby improving the power factor.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: January 14, 2003
    Assignee: LG Electronics Inc.
    Inventors: Gyeong-Hae Han, Jong-Ho Kim, Keon Sim, Hyung-Sang Lee, Dong-Hyuk Lee
  • Power factor compensation device for motor driving inverter system
    Publication number: 20020014876
    Abstract: The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of an utility alternating current power, and outputs a driving signal corresponding to a plurality of sine wave form voltage values stored in a memory according to a detection result, when the zero crossing point of the utility alternating current power is detected in a state where the plurality of sine wave form voltage values corresponding to a voltage of the utility alternating current power and frequencies are stored in the memory. A switching transistor is switched according to the driving signal, and the voltage applied to the inverter is switched according to the switching operation, thereby improving the power factor.
    Type: Application
    Filed: August 27, 2001
    Publication date: February 7, 2002
    Applicant: LG Electronics Inc.
    Inventors: Gyeong-Hae Han, Jong-Ho Kim, Keon Sim, Hyung-Sang Lee, Dong-Hyuk Lee
  • Power factor compensation device for motor driving inverter system
    Patent number: 6281658
    Abstract: The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of an utility alternating current power, and outputs a driving signal corresponding to a plurality of sine wave form voltage values stored in a memory according to a detection result, when the zero crossing point of the utility alternating current power is detected in a state where the plurality of sine wave form voltage values corresponding to a voltage of the utility alternating current power and frequencies are stored in the memory. A switching transistor is switched according to the driving signal, and the voltage applied to the inverter is switched according to the switching operation, thereby improving the power factor.
    Type: Grant
    Filed: December 30, 1999
    Date of Patent: August 28, 2001
    Assignee: LG Electronics Inc.
    Inventors: Gyeong-Hae Han, Jong-Ho Kim, Keon Sim, Hyung-Sang Lee, Dong-Hyuk Lee