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MULTI-TOUCH DETECTING METHOD FOR TOUCH SCREENS

  • US 20110216036A1
  • Filed: 03/03/2011
  • Published: 09/08/2011
  • Est. Priority Date: 03/03/2010
  • Status: Abandoned Application
First Claim
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1. A multi-touch detecting method for touch screens relates to a system comprising the touch screen, a capacitance induction circuit, a capacitance data processing module and a host, wherein the touch screen comprises M*N mutual capacitance arrays formed from M transversal electrodes and N longitudinal electrodes which are orthogonal;

  • The method comprises the following steps;

    A. The capacitance induction circuit detects all capacitance of the touch screen to obtain M*N real-time two-dimensional values corresponding to capacitances, and a two-dimensional array formed from these values is used as the data source for detection of touch points;

    The capacitances of a touched areas is smaller than that of an untouched area;

    if the original value of the whole untouched area is regarded as a flat, a concave can appear in the area touched effectively, and please regard the concave as a “

    depression”

    ;

    B. Judge whether effective touch occurs or not, namely, to find “

    depressions”

    in accordance with the two-dimensional array obtained in Step A, if not, return to Step A;

    or else, do Step C;

    C. Separate the “

    depression”

    touched effectively;

    E. Determine the equivalent “

    depression”

    of the “

    depression”

    touched effectively;

    F. Calculate and output the coordinate corresponding to the equivalent “

    depression”

    of the “

    depression”

    touched effectively, and return to Step A.

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