METHOD OF A TOUCH PANEL DETERMINING MULTI-TOUCH
First Claim
1. A method of determining multi-touch in a touch panel, the method comprising:
- utilizing a plurality of sense channels to detect touch points on the touch panel for generating corresponding sense values;
finding a local minimum of the sense values of the plurality of sense channels according to slope variation of sense values of two neighboring sense channels of the plurality of sense channels;
determining when the sense channel having the local minimum is the last sense channel having a sense value; and
determining number of touch points on the touch panel according to a result of determining whether the sense channel has the local minimum.
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Abstract
In a method of a touch panel determining multi-touch, the touch panel can determine if a sensing channel having a local minimum of a sensing value is the last sensing channel having the sensing value, or determine if sensing channels having the sensing value larger than a threshold generated according to a maximum are successive sensing channels, so as to determine the number of touch points on the touch panel. In addition, the touch panel can find a first local maximum and a second local maximum from the sensing values of the sensing channels, and compare the first local maximum and the second local maximum with a first reference and a second reference, so as to confirm the number of touch points on the touch panel.
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Citations
21 Claims
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1. A method of determining multi-touch in a touch panel, the method comprising:
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utilizing a plurality of sense channels to detect touch points on the touch panel for generating corresponding sense values; finding a local minimum of the sense values of the plurality of sense channels according to slope variation of sense values of two neighboring sense channels of the plurality of sense channels; determining when the sense channel having the local minimum is the last sense channel having a sense value; and determining number of touch points on the touch panel according to a result of determining whether the sense channel has the local minimum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining multi-touch in a touch panel, the method comprising:
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utilizing a plurality of sense channels to detect touch points on the touch panel for generating corresponding sense values; finding a maximum of the sense values of the plurality of sense channels; generating a first threshold according to the maximum; finding sense channels of the plurality of sense channels having sense value greater than the first threshold; and determining when the sense channels having sense value greater than the first threshold are consecutive sense channels for determining number of touch points on the touch panel. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of determining multi-touch in a touch panel, the method comprising:
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utilizing a plurality of sense channels to detect touch points on the touch panel for generating corresponding sense values; determining number of touch points on the touch panel; finding a first local maximum and a second local maximum from the sense values of the plurality of sense channels; and comparing the first local maximum and the second local maximum with a first reference and a second reference for confirming the number of touch points on the touch panel. - View Dependent Claims (19, 20, 21)
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Specification