Patents by Inventor Jun Chao Tan

Jun Chao Tan 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).

  • Ground detection circuit for video signal driver to prevent large clamp transistor current
    Patent number: 7903384
    Abstract: A large current flowing out from video signal line driver is prevented whenever the video signal line is being grounded. The system includes a video signal line driver circuit transmitting video signal at pre-determined DC level, a large current prevention circuit detecting video signal line being shorted to ground and cut-off excessive current source out from video signal line driver circuit into video signal line, a start-up time enhancement circuit improving start-up time of ground detection circuit so that system start-up time is not limited by large current prevention circuit, and a switching threshold control circuit setting the switching threshold of large current prevention circuit and start-up time enhancement circuit.
    Type: Grant
    Filed: November 28, 2008
    Date of Patent: March 8, 2011
    Assignees: Panasonic Corporation, Panasonic Semiconductor Asia Pte. Ltd.
    Inventors: Wee Siong Low, Jun Chao Tan, Yoshinori Ishikawa
  • GROUND DETECTION CIRCUIT FOR VIDEO SIGNAL DRIVER TO PREVENT LARGE CLAMP TRANSISTOR CURRENT
    Publication number: 20100134698
    Abstract: A large current flowing out from video signal line driver is prevented whenever the video signal line is being grounded. The system includes a video signal line driver circuit transmitting video signal at pre-determined DC level, a large current prevention circuit detecting video signal line being shorted to ground and cut-off excessive current source out from video signal line driver circuit into video signal line, a start-up time enhancement circuit improving start-up time of ground detection circuit so that system start-up time is not limited by large current prevention circuit, and a switching threshold control circuit setting the switching threshold of large current prevention circuit and start-up time enhancement circuit.
    Type: Application
    Filed: November 28, 2008
    Publication date: June 3, 2010
    Applicants: PANASONIC CORPORATION, PANASONIC SEMICONDUCTOR ASIA PTE. LTD.
    Inventors: Wee Siong LOW, Jun Chao TAN, Yoshinori ISHIKAWA