Pressure-Sensitive Touch Panel
First Claim
1. Apparatus comprising:
- a multiplexer having a plurality of inputs and an output;
a touch panel comprising;
a layer structure comprising one or more layers, each layer extending perpendicularly to a thickness direction, the one or more layers including a layer of piezoelectric material, the layer structure having first and second opposite faces, and the layer(s) arranged between the first and second faces such that the thickness direction of each layer is perpendicular to the first and second faces;
a plurality of first electrodes disposed on the first face, each first electrode connected to a respective input of the multiplexer;
at least one second electrode disposed on the second face;
a front end module configured to receive an input signal from the multiplexer output, the front end module comprising;
a first stage configured to provide an amplified signal based on the input signal; and
a second stage comprising first and second frequency-dependent filters configured to receive the amplified signal and to provide respective first and second filtered signals;
wherein the first filtered signal has a first frequency bandwidth, and the second filtered signal has a second frequency bandwidth which has a relatively higher start-frequency than the first frequency bandwidth.
1 Assignment
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Accused Products
Abstract
An apparatus for combined capacitance and pressure sensing is described. The apparatus includes a multiplexer (75) having a plurality of inputs (76) and an output (F), a touch panel (29), and a front end module (3). The touch panel includes a layer structure (5; FIG. 15) comprising one or more layers, each extending perpendicularly to a thickness direction, the one or more layers including a layer of piezoelectric material (10; FIG. 15), the layer structure having first (6) and second (7; FIG. 15) opposite faces, and the layer(s) arranged between the first and second faces such that the thickness direction of each layer is perpendicular to the first and second faces. The touch panel also includes a plurality of first electrodes (8) disposed on the first face, each first electrode connected to a respective input of the multiplexer. The touch panel also includes at least one second electrode (9) disposed on the second face. The front end module is configured to receive an input signal (11) from the multiplexer output. The front end module includes a first stage (12) configured to provide an amplified signal based on the input signal, and a second stage comprising first (13) and second (14) frequency-dependent filters configured to receive the amplified signal and to provide respective first (16) and second (17) filtered signals. The first filtered signal has a first frequency bandwidth, and the second filtered signal has a second frequency bandwidth which has a relatively higher start-frequency than the first frequency bandwidth.
48 Citations
63 Claims
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1. Apparatus comprising:
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a multiplexer having a plurality of inputs and an output; a touch panel comprising; a layer structure comprising one or more layers, each layer extending perpendicularly to a thickness direction, the one or more layers including a layer of piezoelectric material, the layer structure having first and second opposite faces, and the layer(s) arranged between the first and second faces such that the thickness direction of each layer is perpendicular to the first and second faces; a plurality of first electrodes disposed on the first face, each first electrode connected to a respective input of the multiplexer; at least one second electrode disposed on the second face; a front end module configured to receive an input signal from the multiplexer output, the front end module comprising; a first stage configured to provide an amplified signal based on the input signal; and a second stage comprising first and second frequency-dependent filters configured to receive the amplified signal and to provide respective first and second filtered signals; wherein the first filtered signal has a first frequency bandwidth, and the second filtered signal has a second frequency bandwidth which has a relatively higher start-frequency than the first frequency bandwidth. - View Dependent Claims (2, 4)
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3. (canceled)
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5-26. -26. (canceled)
- 27. A device for processing signals from a projected capacitance touch panel, the panel comprising a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode, the device configured, in response to receiving 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.
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35-36. -36. (canceled)
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37. A method of processing signals from a projected capacitance touch panel, the panel comprising a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode, the method comprising:
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receiving signal(s) from a given first electrode; generating, based on the received signal(s), a pressure signal indicative of a pressure applied to the touch panel proximate to the given first electrode; and generating, based on the received signal(s), a capacitance signal indicative of a capacitance of the given first electrode. - View Dependent Claims (38, 39, 40, 41)
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42-59. -59. (canceled)
Specification