Multipoint sensing method for capacitive touch panel
First Claim
1. A multipoint sensing method used in a capacitive touch panel comprising a first electrode layer and a second electrode layer being electrically insulated and stacked with said first electrode layer, and adapted to sense multiple touch points when a touch event occurs on one of the first electrode layer and the second electrode layer, the multipoint sensing method comprising the steps of:
- a). inputting AC signals to multiple first electrodes of the first electrode layer and multiple second electrodes of the second electrode layer before touch event so as to detect a first capacitance between each two adjacent first electrodes, a second capacitance between each two adjacent second electrodes and a vertical capacitance intersected between one of the first electrodes and one of the second electrodes;
b). using the AC signal to detect variation of each of the first capacitances and each of the second capacitances, and recording to positions of the respective first electrodes and second electrodes which correspond to the first capacitances and the second capacitances that are changed; and
c). using the AC signal to measure the vertical capacitance at each of the positions intersected by the respective first electrode and second electrode recorded in step b), and comparing the vertical capacitance thus obtained with the vertical capacitance measured in step a), and determining the intersected positions to be the touch points when the respective comparison result shows a difference.
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Abstract
A multi-point sensing method used in a capacitive touch panel is disclosed to detect the voltage variation of every electrode patterned on two parallel electrode layers by means of a capacitive sensing circuit, and measure the vertical capacitance at the intersection crossed by the electrodes of the two electrode layers where the voltage variation is detected, and then compare the vertical capacitance thus measured with the initial vertical capacitance at the same intersection before touch, as a result, the intersection corresponding to the measured vertical capacitance can be determined as the touch point when the comparison result shows different.
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Citations
17 Claims
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1. A multipoint sensing method used in a capacitive touch panel comprising a first electrode layer and a second electrode layer being electrically insulated and stacked with said first electrode layer, and adapted to sense multiple touch points when a touch event occurs on one of the first electrode layer and the second electrode layer, the multipoint sensing method comprising the steps of:
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a). inputting AC signals to multiple first electrodes of the first electrode layer and multiple second electrodes of the second electrode layer before touch event so as to detect a first capacitance between each two adjacent first electrodes, a second capacitance between each two adjacent second electrodes and a vertical capacitance intersected between one of the first electrodes and one of the second electrodes; b). using the AC signal to detect variation of each of the first capacitances and each of the second capacitances, and recording to positions of the respective first electrodes and second electrodes which correspond to the first capacitances and the second capacitances that are changed; and c). using the AC signal to measure the vertical capacitance at each of the positions intersected by the respective first electrode and second electrode recorded in step b), and comparing the vertical capacitance thus obtained with the vertical capacitance measured in step a), and determining the intersected positions to be the touch points when the respective comparison result shows a difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A multipoint sensing method used in a capacitive touch panel comprising a plurality of first electrodes arranged on a first plane in a first direction and a plurality of second electrodes arranged on a second plane in a second direction, and adapted to sense multiple touch points when touch event occurs on the touch panel, the multipoint sensing method comprising the steps of:
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a) calculating and storing an initial vertical capacitance at every intersection crossed by each of the first electrodes and each of the second electrodes; b) monitoring the voltage variation of the first electrodes and the second electrodes and recording the position where causing the voltage variation; and c) detecting each vertical capacitance intersected by the first electrodes and the second electrodes which crossing the recorded position, and comparing the detected vertical capacitance with the initial vertical capacitance stored in step a) respective to the recorded position, and then determining the intersection corresponding to the detected vertical capacitance to be the touch point when the comparison result shows different. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification