Scanned piezoelectric touch sensor device
First Claim
1. An input device, comprising:
- a first array comprising a first plurality of elongated sensor electrodes aligned in parallel in a first direction;
a second array comprising a second plurality of elongated sensor electrodes aligned in parallel in a second direction, the second direction different than the first direction; and
a piezoelectric material layer disposed between the first array and second array; and
a processing system configured to;
deliver a first electrical signal to a first elongated sensor electrode of the first plurality of elongated sensor electrodes;
maintain one or more second electrodes of the second plurality of elongated sensor electrodes at a reference voltage level;
sense, after the first electrical signal has been delivered, a fluctuation in an electrical characteristic of a region of the piezoelectric material layer over time;
detect a presence or an absence of an input object by detecting a change in the sensed electrical characteristic of the region, wherein detecting the changes in the sensed electrical characteristic comprises;
receiving a second electrical signal from a second electrode in the second plurality of elongated sensor electrodes while maintaining the reference voltage level on the one or more second electrodes;
receiving a third electrical signal from the second electrode, wherein the third electrical signal is generated by applying a fourth electrical signal to the first electrode and maintaining the reference voltage level on the second electrode at a first time, wherein the received second electrical signal is received at a second time; and
comparing the received second electrical signal with the received third electrical signal.
2 Assignments
0 Petitions
Accused Products
Abstract
Embodiments of the disclosure generally provide an integrated input device that is configured to sense the position and amount of force applied by input objects that are in contact with an input region of an input device. The input device is generally configured to sense the position and amount of force applied by an input object that is in contact with the input region using a piezoelectric material. The input device generally includes a plurality of electrodes that are positioned to measure an electrical characteristic of the piezoelectric layer at different points within the input region to determine the position and/or amount of applied force. The input device may also include one or more components that are able to simultaneously or sequentially sense the position of an input object using a touch sensing technique independent of the electrical properties of the piezoelectric material to sense the input object position.
28 Citations
25 Claims
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1. An input device, comprising:
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a first array comprising a first plurality of elongated sensor electrodes aligned in parallel in a first direction; a second array comprising a second plurality of elongated sensor electrodes aligned in parallel in a second direction, the second direction different than the first direction; and a piezoelectric material layer disposed between the first array and second array; and a processing system configured to; deliver a first electrical signal to a first elongated sensor electrode of the first plurality of elongated sensor electrodes; maintain one or more second electrodes of the second plurality of elongated sensor electrodes at a reference voltage level; sense, after the first electrical signal has been delivered, a fluctuation in an electrical characteristic of a region of the piezoelectric material layer over time; detect a presence or an absence of an input object by detecting a change in the sensed electrical characteristic of the region, wherein detecting the changes in the sensed electrical characteristic comprises; receiving a second electrical signal from a second electrode in the second plurality of elongated sensor electrodes while maintaining the reference voltage level on the one or more second electrodes; receiving a third electrical signal from the second electrode, wherein the third electrical signal is generated by applying a fourth electrical signal to the first electrode and maintaining the reference voltage level on the second electrode at a first time, wherein the received second electrical signal is received at a second time; and comparing the received second electrical signal with the received third electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of determining a position of an input object using a input device, the method comprising:
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applying a first electrical signal to a first electrode of a first plurality of elongated sensor electrodes; maintaining one or more second electrodes of a second plurality of elongated sensor electrodes at a reference voltage level, wherein a piezoelectric material layer is disposed between the first plurality of elongated sensor electrodes and the second plurality of elongated sensor electrodes; sensing a fluctuation in an electrical characteristic of a region of the piezoelectric material layer over time after the first electrical signal has been applied; and detecting a presence of an input object that is in contact with the input device by detecting a change in the sensed electrical characteristic of a region of the piezoelectric material layer over time, wherein detecting the change in the sensed electrical characteristic comprises; receiving a second electrical signal from a second electrode in the second plurality of elongated sensor electrodes while maintaining the reference voltage level on the one or more electrodes; receiving a third electrical signal from the second electrode, wherein the third electrical signal is generated by applying a fourth electrical signal to the first electrode and maintaining the reference voltage level on the second electrode at a first time, wherein the received second electrical signal is received at a second time; and comparing the received second electrical signal with the received third electrical signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of determining force applied by one or more input objects to a input device, the method comprising:
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applying a first electrical signal to a first electrode of a first plurality of elongated sensor electrodes; maintaining a second plurality of elongated sensor electrodes at one or more reference voltage levels, wherein a piezoelectric material layer is disposed between the first plurality of elongated sensor electrodes and the second plurality of elongated sensor electrodes; receiving, while maintaining the reference voltage level on the second plurality of elongated electrodes, a second electrical signal using a second electrode of the second plurality of elongated sensor electrodes; responsive to removing the first electrical signal from the first electrode, determining a decay rate of the second electrical signal, wherein the decay rate reflects mechanical oscillations induced within the piezoelectric material layer; and determining force measurements using the determined decay rate. - View Dependent Claims (25)
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Specification