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Method and device for position detection

  • US 8,564,564 B2
  • Filed: 09/22/2011
  • Issued: 10/22/2013
  • Est. Priority Date: 10/09/2009
  • Status: Active Grant
First Claim
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1. A method for position detection that neglects wide-area touches, comprising:

  • providing a sensing device including a plurality of sensors including a plurality of first sensors and a plurality of second sensors, these first and second sensors intersecting each other at a plurality of intersecting points;

    obtaining a first 1-D sensing information from signals of the first sensors by self-capacitance detection;

    obtaining a second 1-D sensing information from signals of the second sensors by self-capacitance detection;

    a detected touch related sensing information is determined based on the range of each touch related sensing information on the first 1-D sensing information and the second 1-D sensing information, wherein each touch related sensing information corresponds to a touch or approach by at least one external object;

    at least one 1-D position is analyzed based on each detected touch related sensing information; and

    at least one 2-D position is analyzed by performing mutual-capacitance detection on each 1-D position;

    wherein the mutual-capacitance detection includes;

    providing a driving signal to one of these first sensors as a first signal source, and detecting variations in capactively coupled signals between the first signal source, these first 1-D sensors and the at least one external object using these first sensors;

    orproviding a driving signal to one of these second sensors as a first signal source, and detecting variations in capactively coupled signals between the first signal source, these second 1-D sensors and the at least one external object using these second sensors;

    selecting a sensor provided with the driving signal from one of these sensors based on the at least one 1-D position;

    generating a third 1-D sensing information based on signals of these first sensors or the second sensors when each sensor selected based on the 1-D position is provided with the driving signal;

    analyzing at least one first 1-D position based on the third 1-D sensing information;

    selecting a sensor provided with the driving signal from one of these sensors based on each first 1-D position;

    generating a fourth 1-D sensing information based on signals of these first sensors or the second sensors when each sensor selected based on each first 1-D position is provided with the driving signal;

    analyzing at least one second 1-D position corresponding to each first 1-D position based on the fourth 1-D sensing information; and

    providing at least one 2-D position based on the at least one second 1-D position corresponding to each first 1-D position.

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