Multi-touch sensing device with multi-frequency capacitive sensing
A touch screen and projected capacitive technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as difficult to use, mistaken, and interference in the electromagnetic environment
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[0038] A simplified model exists for electrically describing a capacitive touch sensing device comprising a matrix of electrodes consisting of conductive rows and columns. It consists of a touch representation in which the operator capacitively couples his or her finger with the matrix by projecting the surface of his or her finger onto the tablet. The surface is covered with at least two electrodes, the first on the rows and the second on the columns. then the operator will be considered to have added capacitance C between ground and at least the row or column concerned d . However, the model is still local and does not take into account the measurement environment.
[0039] figure 2 A more complex model of a capacitive matrix device is shown. In fact, each row is connected to measurement and / or power supply devices via analog switches. These switches increase the coupling capacitance C with respect to ground m and has a resistor R that attenuates the signal being meas...
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