Patents by Inventor Zhanwei MAO

Zhanwei MAO 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).

  • Method and apparatus for capacitive sensing
    Patent number: 10126893
    Abstract: Embodiments of the present invention provide a capacitive sensing apparatus, a manufacturing and operation method thereof and an electronic device including the capacitive sensing apparatus. An apparatus includes first capacitive sensing unit(s) and second capacitive sensing unit, and a control unit. The control unit is configured to control periodic charging of the capacitive sensing units, determine first voltage change(s) for the first capacitive sensing unit(s) and second voltage change(s) for the second capacitive sensing unit(s), and calculate, for the first capacitive sensing unit(s), a signal-to-noise ratio value based on the first voltage change(s) and the second voltage change(s). Sensing results of first capacitive sensing unit(s) may be calibrated based on the sensing results of second capacitive sensing unit(s), thereby reducing influence of environmental changes on stability and sensitivity of a capacitive sensing apparatus.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: November 13, 2018
    Assignee: Nokia Technologies Oy
    Inventors: Zhanwei Mao, Jianfeng Zhu, Yu Wang, Jinjuan Liu
  • Method and Apparatus for Capacitive Sensing
    Publication number: 20170068351
    Abstract: Embodiments of the present invention provide a capacitive sensing apparatus, a manufacturing and operation method thereof and an electronic device including the capacitive sensing apparatus. An apparatus includes first capacitive sensing unit(s) and second capacitive sensing unit, and a control unit. The control unit is configured to control periodic charging of the capacitive sensing units, determine first voltage change(s) for the first capacitive sensing unit(s) and second voltage change(s) for the second capacitive sensing unit(s), and calculate, for the first capacitive sensing unit(s), a signal-to-noise ratio value based on the first voltage change(s) and the second voltage change(s). Sensing results of first capacitive sensing unit(s) may be calibrated based on the sensing results of second capacitive sensing unit(s), thereby reducing influence of environmental changes on stability and sensitivity of a capacitive sensing apparatus.
    Type: Application
    Filed: March 4, 2014
    Publication date: March 9, 2017
    Inventors: Zhanwei MAO, Jianfeng ZHU, Yu WANG, Jinjuan LIU