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Coordinate positioning device and method thereof

  • US 20050088406A1
  • Filed: 03/18/2004
  • Published: 04/28/2005
  • Est. Priority Date: 10/24/2003
  • Status: Active Grant
First Claim
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1. A coordinate positioning method, which is applied in a thin film positioning device for detecting a coordinate value of a contact point under an environment of periodic noises, comprising the steps of:

  • obtaining a first sampling value of the contact point at a first time point;

    obtaining a second sampling value of the contact point at a second time point, wherein the interval between the first time point and the second time point is roughly a half of the period of the periodic noise;

    determining if the absolute value of the difference between the first sampling value and the second sampling value is smaller than a first threshold value or not;

    if not, neglect this contact point and end the process of this method;

    obtain a third sampling value of the contact point at a third time point, wherein the interval between the third time point and the first time point is roughly a multiple of the period of the periodic noise;

    determining if the absolute value of the difference between the first sampling value and the third sampling value is smaller than a second threshold value or not;

    if not, neglect this contact point and end the process of this method;

    use the average value of the first sampling value and the second sampling value to obtain the coordinate of the contact point.

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