Device for processing signals from a pressure-sensing touch panel
First Claim
1. A device for processing signals from a projected capacitance touch panel, the touch panel comprising a laser of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode, the device 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 comprising:
- an amplifier configured to generate an amplified signal based on the input signals; and
an analog-to-digital converter configured to be synchronised with the capacitance signal, and to generate the pressure signal by sampling the amplified signal at times corresponding, to the amplitude of the capacitance signal being substantially equal to a selected value.
1 Assignment
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Accused Products
Abstract
A device (42) is provided for processing signals (10) from a projected capacitance touch panel (43), the touch panel (43) including a layer of piezoelectric material (9) disposed between a plurality of first electrodes (7, 27) and at least one second electrode (8). The device is configured, in response to receiving input signals (10) from a given first electrode (7, 27), to generate a pressure signal (15a, 15b) indicative of a pressure applied to the touch panel (43) proximate to the given first electrode (7, 27) and a capacitance signal (54a, 54b) indicative of a capacitance of the given first electrode (7, 27). The device (42) includes an amplifier (52) configured to generate an amplified signal (14a, 14b) based on the input signals (10). The device (42) also includes an analog-to-digital converter (50a, 50b) configured to be synchronised (53) with the capacitance signal (54a, 54b), and to generate the pressure signal (15a, 15b) by sampling the amplified signal (14a, 14b) at times corresponding to the amplitude of the capacitance signal (54a, 54b) being substantially equal to a ground, common mode or minimum value.
21 Citations
22 Claims
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1. A device for processing signals from a projected capacitance touch panel, the touch panel comprising a laser of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode, the device 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 comprising:
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an amplifier configured to generate an amplified signal based on the input signals; and an analog-to-digital converter configured to be synchronised with the capacitance signal, and to generate the pressure signal by sampling the amplified signal at times corresponding, to the amplitude of the capacitance signal being substantially equal to a selected value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. (canceled)
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13. (canceled)
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14. A method of processing signals from a projected capacitance touch panel, the touch panel comprising a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode, the method comprising, in response to receiving input signals from a given first electrode:
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generating a capacitance signal indicative of a capacitance of the given first electrode; generating an amplified signal based on the input signals; and generating, using an analog-to-digital converter synchronised with the capacitance signal, a pressure signal indicative of a pressure applied to the touch panel proximate to the given first electrode, wherein the pressure signal is generated by sampling the amplified signal at times corresponding to the amplitude of the capacitance signal being substantially equal to a selected value. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification