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Capacitive touch system using differential sensing and operating method thereof

  • US 9,740,356 B1
  • Filed: 02/05/2016
  • Issued: 08/22/2017
  • Est. Priority Date: 02/05/2016
  • Status: Active Grant
First Claim
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1. A capacitive touch system comprising:

  • a drive circuit configured to output a drive signal;

    a capacitive sensing matrix comprising a plurality of sensing elements arranged in rows and columns;

    an encoding module configured to encode the drive signal corresponding to each row of the sensing elements to output encoded drive signals;

    a modulation module configured to modulate the encoded drive signals corresponding to each row of the sensing elements to concurrently output encoded and modulated drive signals to each row of the sensing elements;

    a detection circuit coupled to the capacitive sensing matrix and configured to respectively generate a detection matrix according to a detection signal of each column of the sensing elements;

    a decoding module configured to decode the detection matrices to output a two-dimensional detection vector corresponding to each of the sensing elements;

    a first subtraction circuit configured to subtract a first digital component of the two-dimensional detection vector of a second sensing element among the plurality of sensing elements from a first digital component of the two-dimensional detection vector of a first sensing element among the plurality of sensing elements to generate a first component difference; and

    a second subtraction circuit configured to subtract a second digital component of the two-dimensional detection vector of the second sensing element from a second digital component of the two-dimensional detection vector of the first sensing element to generate a second component difference.

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