×

Capacitive touch sensing system

  • US 9,886,142 B2
  • Filed: 12/03/2013
  • Issued: 02/06/2018
  • Est. Priority Date: 12/03/2013
  • Status: Active Grant
First Claim
Patent Images

1. A capacitive touch sensing system, comprising:

  • a touch panel comprising a plurality of driving electrodes intersecting with a plurality of sensing electrodes configured to form a plurality of channels each associated with two adjacent sensing electrodes;

    a differential unit configured to calculate a difference between sensing signals output by two adjacent amplification units directly coupled to the two adjacent sensing electrodes of each channel to output a differential signal;

    a downconversion unit coupled downstream of the differential unit and configured toreceive the differential signal and demodulate the differential signal, wherein the demodulation creates a first signal path with one of two orthogonal signals to generate one of two dc component signals in the first signal path, and the demodulation creates a second signal path with another one of the two orthogonal signals to generate another one of the two dc component signals in the second signal path, andaccumulate the one of the two dc component signals in the first signal path and the another one of the two dc component signals in the second signal path to generate two accumulated dc component signals each in one of the first signal path and the second signal path; and

    an AD converter coupled downstream of the downconversion unit and configured to convert the accumulated two dc component signals to two digital signals,wherein each pair of the two dc component signals corresponds to one of the plurality of channels associated with two adjacent sensing electrodes.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×