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Touch sensor detector system and method

  • US 9,001,082 B1
  • Filed: 06/25/2014
  • Issued: 04/07/2015
  • Est. Priority Date: 09/27/2013
  • Status: Active Grant
First Claim
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1. A touch sensor detector system comprising:

  • (a) touch sensor array (TSA);

    (b) array column driver (ACD);

    (c) column switching register (CSR);

    (d) column driving source (CDS);

    (e) array row sensor (ARS);

    (f) row switching register (RSR);

    (g) analog to digital converter (ADC); and

    (h) computing control device (CCD);

    whereinsaid TSA comprises a variable impedance array (VIA) comprising VIA columns and VIA rows;

    said VIA is configured to electrically couple a plurality of interlinked impedance columns (IIC) within said TSA with a plurality of interlinked impedance rows (IIR) within said TSA;

    said IIC further comprises a plurality of individual column impedance elements (ICIE) electrically connected in series between said VIA columns;

    said IIR further comprises a plurality of individual row impedance elements (IRIE) electrically connected in series between said VIA rows;

    said ACD is configured to select said IIC within said TSA based on said CSR;

    said ACD is configured to electrically drive said selected IIC using said CDS;

    said ARS is configured to select said IIR within said TSA based on said RSR;

    said ADC is configured to sense the electrical state of said selected IIR and convert said electrical state to a sensed digital value (SDV);

    said electrical state is determined by the addition of multiple current contributions from a voltage divider formed between the columns of said VIA as driven by said ACD through said IIC and current divider contributions formed between multiple rows of said VIA as selected by said ARS to produce a sensed current for a given row-column intersection within said VIA; and

    said CCD is configured to sample said SDV from said ADC at a plurality of interpolated positions within said TSA to form a touch sensor matrix (TSM) data structure.

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