Patents by Inventor Changchao Shi

Changchao Shi 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).

  • Capacitive keypad position sensor with low cross-interference
    Patent number: 9178511
    Abstract: A capacitive keypad position sensor includes a keypad touch panel having a first defined key area disposed in a plane having first and second orthogonal axes. First and second electrodes respectively occupy first and second areas below the first defined key area. Each electrode includes a plurality of parallel rows extending along the first axis and spaced apart from one another along the second axis. Each of the plurality of rows has a length along the first axis that is substantially equal to a width of the first defined key area along the first axis measured at a position along the second axis corresponding to the respective one of the plurality of rows. At least some of the first and second pluralities of rows are interleaved with one another.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: November 3, 2015
    Assignee: FREESCALE SEMICONDUCTOR, INC.
    Inventors: Changchao Shi, Yonggang Chen, Dechang Wang
  • CAPACITIVE KEYPAD POSITION SENSOR WITH LOW CROSS-INTERFERENCE
    Publication number: 20140367239
    Abstract: A capacitive keypad position sensor includes a keypad touch panel having a first defined key area disposed in a plane having first and second orthogonal axes. First and second electrodes respectively occupy first and second areas below the first defined key area. Each electrode includes a plurality of parallel rows extending along the first axis and spaced apart from one another along the second axis. Each of the plurality of rows has a length along the first axis that is substantially equal to a width of the first defined key area along the first axis measured at a position along the second axis corresponding to the respective one of the plurality of rows. At least some of the first and second pluralities of rows are interleaved with one another.
    Type: Application
    Filed: March 31, 2014
    Publication date: December 18, 2014
    Applicant: Freescale Semiconductor, Inc.
    Inventors: Changchao Shi, Yonggang Chen, Dechang Wang