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Method for specifying touched position determined by first coordinate along first signal line and second coordinate along second signal line, and circuit for specifying the touched position

  • US 9,898,136 B2
  • Filed: 08/12/2016
  • Issued: 02/20/2018
  • Est. Priority Date: 06/27/2011
  • Status: Active Grant
First Claim
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1. A method of specifying a touched position on a touch panel, including a plurality of first signal lines and a plurality of second signal lines which intersect with the plurality of first signal lines, by detecting a distribution of capacitance of a plurality of capacitors that are each formed on intersections of the plurality of first signal lines with the plurality of second signal lines,the method comprising:

  • a first capacitance distribution detecting step of detecting a first capacitance distribution on the touch panel in accordance with electric charges corresponding to the plurality of capacitors which electric charges are outputted from the plurality of second signal lines by driving the plurality of first signal lines;

    a first touched position specifying step of specifying a first touched position on the touch panel in accordance with the first capacitance distribution;

    a second capacitance distribution detecting step of detecting a second capacitance distribution on the touch panel in accordance with electric charges corresponding to the plurality of capacitors which electric charges are outputted by the plurality of first signal lines by driving the plurality of second signal lines; and

    a second touched position specifying step of specifying a second touched position on the touch panel in accordance with the second capacitance distribution, wherein one of the first touched position, specified in the first touched position specifying step, and the second touched position, specified in the second touched position specifying step, is received as the touched position, wherein;

    a generation status of noise on the plurality of second signal lines is checked in accordance with the first capacitance distribution;

    a generation status of noise on the plurality of first signal lines is checked in accordance with the second capacitance distribution;

    in the first touched position specifying step, in a case where (i) the noise is generated on any of the plurality of second signal lines and (ii) the first touched position cannot be specified, the second touched position specified in the second touched position specifying step is received as the touched position; and

    in the second touched position specifying step, in a case where (i) the noise is generated on any of the plurality of first signal lines and (ii) the second touched position cannot be specified, the first touched position specified in the first touched position specifying step is received as the touched position.

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