×

System and method to measure capacitance of capacitive sensor array

  • US 10,386,969 B1
  • Filed: 11/07/2012
  • Issued: 08/20/2019
  • Est. Priority Date: 09/26/2008
  • Status: Active Grant
First Claim
Patent Images

1. A method for determining position information, the method comprising:

  • selecting a first electrode of a capacitive sensor array;

    selecting a second electrode of said capacitive sensor array;

    selecting a third electrode of said capacitive sensor array, wherein said second electrode and said third electrode intersect with said first electrode of said capacitive sensor array;

    receiving;

    a first current associated with a capacitance of said second electrode and said first electrode, the first current induced on the second electrode by a drive signal applied to the first electrode and capacitively coupled to the second electrode, anda second current associated with another capacitance of said third electrode and said first electrode, the second current induced on the third electrode by the drive signal applied to the first electrode and capacitively coupled to the third electrode;

    measuring a capacitance between said second electrode and said third electrode, based on a comparison of the first and second currents, the measuring of the capacitance including;

    converting the result of the comparison of the first and second currents to a digital value, the digital value representative of the measured capacitance; and

    determining a location of an object proximate to said capacitive sensor array, based on the measured capacitance.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×