Patents by Inventor Hoyoung Chang

Hoyoung Chang 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).

  • Solution and methodology for detecting surface damage on capacitive sensor integrated circuit
    Patent number: 6545486
    Abstract: Minute surface damage or irregularities on the sensing surface of a capacitive sensor integrated circuit is detected by acquiring a preliminary image of the capacitance readings for the sensor array, coating the sensing surface with an electrolyte solution, then acquiring an additional image while the sensing surface is coated and/or after the electrolyte solution is removed. The electrolyte solution accelerates manifestation of pixel degradation or failure caused by surface damage or irregularities. Defective regions are identified by change of grayscale pixels in the preliminary image while the electrolyte coating is on the sensing surface and then again after the electrolyte coating is removed.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: April 8, 2003
    Assignee: STMicroelectronics, Inc.
    Inventors: Fred P. Lane, Hoyoung Chang
  • SOLUTION AND METHODOLOGY FOR DETECTING SURFACE DAMAGE ON CAPACITIVE SENSOR INTEGRATED CIRCUIT
    Publication number: 20030042911
    Abstract: Minute surface damage or irregularities on the sensing surface of a capacitive sensor integrated circuit is detected by acquiring a preliminary image of the capacitance readings for the sensor array, coating the sensing surface with an electrolyte solution, then acquiring an additional image while the sensing surface is coated and/or after the electrolyte solution is removed. The electrolyte solution accelerates manifestation of pixel degradation or failure caused by surface damage or irregularities. Defective regions are identified by change of grayscale pixels in the preliminary image while the electrolyte coating is on the sensing surface and then again after the electrolyte coating is removed.
    Type: Application
    Filed: August 30, 2001
    Publication date: March 6, 2003
    Inventors: Fred P. Lane, Hoyoung Chang