Charge transfer device and method, touch sensing device and method

A touch sensing device comprising:

• 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;
• wherein the processor performs the steps of
• a) comparing whether the current count value exceeds the last count value, wherein if the current count value exceeds the last count value, the process proceeds to step b), wherein if the current count value does not exceed the last count value, the process proceeds to step c);
• b) judging whether the sensing point was in a touching state the last time, wherein if the sensing point was in the touching state the last time, the process proceeds to step d), wherein if the sensing point was not in the touching state the last time, the non-touching count value is refreshed with half of the sum of the current count value and the process is ended;
• c) judging whether the sensing point was in a touching state the last time, wherein if the sensing point was in the touching state the last time, the touching count value is refreshed with half of the sum of the current count value and the last count value and the process flow is ended, wherein if the sensing point was not in a touching state the last time, the process proceeds to step e);
• d) calculating the difference between the current count value and the last count value, then comparing whether the difference exceeds a non-touching state standard difference set in advance, wherein if the difference exceeds the non-touching state standard difference, the sensing point is in the non-touching state and the non-touching count value is refreshed with half of the sum of the current count value and the last count value and the process is ended;
• wherein if the difference does not exceed the non-touching state standard difference, the sensing point is in the touching state and the process is ended;
• and
• e) calculating the difference between the current count value and the last touching count value, then comparing whether the difference exceeds the touching standard difference;
• wherein if the difference exceeds the touching standard difference, the sensing point is in a touching state;
• wherein if the difference is less than the touching standard difference, the sensing point is in a non-touching state;
• 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.