Device for processing signals from a pressure-sensing touch panel
A device is provided for processing signals from a projected capacitance touch panel, the touch panel including a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode. The device is configured, in response to receiving input signals from...
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Zusammenfassung: | A device is provided for processing signals from a projected capacitance touch panel, the touch panel including a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode. The device is configured, in response to receiving input signals from a given first electrode, to generate a pressure signal indicative of a pressure applied to the touch panel proximate to the given first electrode and a capacitance signal indicative of a capacitance of the given first electrode. The device includes an amplifier configured to generate an amplified signal (14) based on the input signals. The device also includes an analog-to-digital converter (50) configured to be synchronised with the capacitance signal (17) (e.g. by receiving a clocking signal for the capacitive touch controller or the actual driving signal for capacitive measurements and generating a synchronization signal), and to generate the pressure signal (15) by sampling the amplified signal at times corresponding to the amplitude of the capacitance signal being substantially equal to a ground, common mode or minimum value. |
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