Waveform dividing method for a capacitive touch control device
First Claim
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1. A waveform dividing method for a capacitive touch control device, comprising steps of:
- step A;
saving and updating a first waveform in a direction caused by a first object when the first object touches the capacitive touch control device;
step B;
saving a multi-touch waveform in the direction when the first object is stationary on the capacitive touch control device and a second object further touches the capacitive touch control device, wherein the multi-touch waveform is established by the first waveform and a second waveform in the direction caused by the second object;
step C;
identifying whether the multi-touch waveform has waveform overlapping resulted from the first waveform and the second waveform; and
step D;
extracting the second waveform from a difference between the multi-touch waveform and the first waveform if the multi-touch waveform is identified as having waveform overlapping;
wherein step C further comprises a step of identifying the multi-touch waveform as having waveform overlapping when the multi-touch waveform does not have a valley.
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Abstract
A waveform dividing method for a capacitive touch control device saves a first waveform in a direction, and then saves a multi-touch waveform in the direction when another object further touches the capacitive touch control device. If the multi-touch waveform is identified as having waveform overlapping, a second waveform is extracted from the difference between the multi-touch waveform and the first waveform. By calculating with the second waveform, accurate positioning of the objects on the capacitive touch control device can be achieved.
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Citations
18 Claims
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1. A waveform dividing method for a capacitive touch control device, comprising steps of:
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step A;
saving and updating a first waveform in a direction caused by a first object when the first object touches the capacitive touch control device;step B;
saving a multi-touch waveform in the direction when the first object is stationary on the capacitive touch control device and a second object further touches the capacitive touch control device, wherein the multi-touch waveform is established by the first waveform and a second waveform in the direction caused by the second object;step C;
identifying whether the multi-touch waveform has waveform overlapping resulted from the first waveform and the second waveform; andstep D;
extracting the second waveform from a difference between the multi-touch waveform and the first waveform if the multi-touch waveform is identified as having waveform overlapping;wherein step C further comprises a step of identifying the multi-touch waveform as having waveform overlapping when the multi-touch waveform does not have a valley. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A waveform dividing method for a capacitive touch control device, comprising steps of:
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step A;
saving a first waveform in a direction caused by a first object when the first object touches the capacitive touch control device;step B;
identifying waveform overlapping in a multi-touch waveform established by the first waveform and a second waveform in the direction caused by a second object;step C;
extracting the second waveform from a difference between the multi-touch waveform and the first waveform; andstep D;
calculating with the second waveform to produce a position information in the direction for the second object;wherein step B further comprises a step of identifying the multi-touch waveform as having waveform overlapping when the multi-touch waveform does not have a valley. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A waveform dividing method for a capacitive touch control device, comprising steps of:
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step A;
saving a first waveform in a direction;step B;
identifying waveform overlapping in a multi-touch waveform established by the first waveform and a second waveform in the direction;step C;
reconstructing the second waveform from a difference between the multi-touch waveform and the first waveform; andstep D;
calculating with the second waveform to produce a position information;wherein step B further comprises a step of identifying the multi-touch waveform as having waveform overlapping when the multi-touch waveform does not have a valley. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification