Charge transfer device and method, touch sensing device and...

Details Charge transfer device and method, touch sensing device and... Charge transfer device and method, touch sensing device and...

2006-12-29

2009-10-06

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S681000, C345S173000, C178S018060

Reexamination Certificate

active

07598752

ABSTRACT:
The disclosure relates to a touch sensing device and method. An embodiment of the disclosed method includes 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 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 touching state or in 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.

REFERENCES:
patent: 5730165 (1998-03-01), Philipp
patent: 6452514 (2002-09-01), Philipp
patent: 6466036 (2002-10-01), Philipp
patent: 6993607 (2006-01-01), Philipp

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