CHARGE TRANSFER DEVICE AND METHOD, TOUCH SENSING DEVICE AND METHOD
First Claim
1. A charge transfer method comprises:
- charging a first capacitor periodically at regular intervals; and
transferring the charge accumulated on the first capacitor to a second capacitor periodically at the regular interval.
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Accused Products
Abstract
The disclosure relates to a touch sensing device and method. An embodiment of the disclosed method that comprises starting to count with a counter while charging a sensing point which has distributed capacitance periodically, then transferring the charge on the sensing point to a second capacitor. Next, the voltage on the second capacitor is compared with a reference voltage, and if the former exceeds the latter, the counter stops counting and saving the count value. If the voltage on the second capacitor is less than the reference voltage, the sensing point is judged to determine whether it is in a touching state or in a non-touching state according to the saved count value while discharging the second capacitor, clearing the counter after the discharge, then restarting the method. Using the device and method of this disclosure, the touching sensing action can be tested accurately.
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Citations
22 Claims
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1. A charge transfer method comprises:
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charging a first capacitor periodically at regular intervals; and transferring the charge accumulated on the first capacitor to a second capacitor periodically at the regular interval.
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2. A touch sensing method comprising:
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counting with a counter while charging a sensing point to produce sensing capacitance charge periodically; transferring the charge on the capacitance to a second capacitor; comparing the voltage on the second capacitor with a reference voltage, wherein once the voltage on the second capacitor exceeds the reference voltage, the counter stops counting and saves the count value of the voltage; and judging whether the sensing point is in a touching state or in a non-touching state according to the saved count value while discharging the second capacitor, clearing the counter after the discharge, and restarting the counter. - View Dependent Claims (3, 8, 9, 10, 20)
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4-7. -7. (canceled)
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11. A charge transfer device comprising:
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a first capacitor, a second capacitor, a power supply, a first switch, a second switch; and a power supply that is connected with the first switch for charging the first capacitor periodically; and
wherein the second capacitor is connected with the first capacitor via the second switch, and a charge accumulated on the first capacitor is transferred to the second capacitor. - View Dependent Claims (12)
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13. A touch sensing device comprising:
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a sensing point for producing a sensing capacitor; a power supply connected to a first switch for charging the sensing capacitor produced at the sensing point periodically; a second capacitor connected with the sensing capacitor via a second switch and the charge accumulated on the sensing capacitor is transferred to the second capacitor; a comparator for comparing voltage on the second capacitor with a reference voltage; a counter; a processor; a third switch; wherein the comparator produces a turnover signal and sends it to the third switch and the counter; wherein after receiving the turnover signal, the third switch is closed and the second capacitor discharges, the third switch opens after the discharge; and the counter stops counting after receiving the turnover signal and sends a count value to the processor which judges whether the sensing point is in touch state according to the count value, then the processor returns a signal and clears the counter, the counter restarts the count. - View Dependent Claims (14, 15, 16, 17, 18, 19, 21, 22)
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Specification