MULTI-TOUCH DETECTING METHOD FOR TOUCH SCREENS
First Claim
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.
1 Assignment
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Accused Products
Abstract
A multi-touch detecting method for touch screens relates to an input device for converting data to be processed so that a computer can process the data, particularly to a digital converter with a characteristic converting mode. The digital converter comprises a touch screen, a capacitance induction circuit, a capacitance data processing module and a system host, wherein the touch screen comprises M*N mutual capacitance arrays formed from M transversal electrodes and N longitudinal electrodes which are orthogonal; the capacitance induction circuit continuously detects all capacitances of the touch screen in real time to obtain one frame of real-time two-dimensional arrays corresponding to the capacitances; the capacitance induction circuit takes the original capacitance of the touch screen without touch as a flat, takes an area touched effectively as a “depression”, judges the “depression”, separates the “depression” into “equivalent depressions” formed by touching one or multiple points effectively and calculates the coordinate of the central position of the “equivalent depressions”. The multi-touch detecting method for touch screens has the advantages of high touch sensing accuracy and accurate touch point calculation and conforms to requirements of multipoint sensing.
15 Citations
10 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- The method comprises the following steps;
Specification