Techniques for providing a haptic output and sensing a haptic input using a piezoelectric body
First Claim
1. A haptic interface, comprising:
- a piezoelectric body;
a first electrode coupled to the piezoelectric body;
a second electrode coupled to the piezoelectric body; and
a control circuit, comprising;
a haptic actuator circuit coupled to the first electrode and configured to charge the piezoelectric body, the charging causing the piezoelectric body to provide a haptic output;
a haptic sensor circuit coupled to the second electrode and configured to sense an electrical change at the second electrode, the electrical change related to a haptic input received by the piezoelectric body; and
an overcurrent protection circuit coupled to the second electrode and configured to limit a current flow into the haptic sensor circuit while the haptic actuator circuit is charging the piezoelectric body.
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Abstract
Haptic interfaces are described. One haptic interface includes a piezoelectric body and first and second electrodes coupled to the piezoelectric body. The haptic interface also includes a control circuit. The control circuit includes a haptic actuator, a haptic sensor circuit, and an overcurrent protection circuit. The haptic actuator circuit is coupled to the first electrode and configured to charge the piezoelectric body. The charging causes the piezoelectric body to provide a haptic output. The haptic sensor circuit is coupled to the second electrode and configured to sense an electrical change at the second electrode. The electrical change is related to a haptic input received by the piezoelectric body. The overcurrent protection circuit is coupled to the second electrode and configured to limit a current flow into the haptic sensor circuit while the haptic actuator circuit is charging the piezoelectric body.
798 Citations
18 Claims
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1. A haptic interface, comprising:
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a piezoelectric body; a first electrode coupled to the piezoelectric body; a second electrode coupled to the piezoelectric body; and a control circuit, comprising; a haptic actuator circuit coupled to the first electrode and configured to charge the piezoelectric body, the charging causing the piezoelectric body to provide a haptic output; a haptic sensor circuit coupled to the second electrode and configured to sense an electrical change at the second electrode, the electrical change related to a haptic input received by the piezoelectric body; and an overcurrent protection circuit coupled to the second electrode and configured to limit a current flow into the haptic sensor circuit while the haptic actuator circuit is charging the piezoelectric body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A haptic interface, comprising:
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a piezoelectric body; a first electrode coupled to the piezoelectric body; a second electrode coupled to the piezoelectric body; and a control circuit, comprising; a haptic actuator circuit coupled to the first electrode and configured to maintain a charge on the piezoelectric body, the charge causing the piezoelectric body to provide a haptic output; and a haptic sensor circuit coupled to the second electrode and configured to sense an electrical change at the second electrode while the piezoelectric body is charged, the electrical change related to a haptic input received by the piezoelectric body.
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13. A method of operating a haptic interface, comprising:
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charging a piezoelectric body of the haptic interface to deliver a haptic output; limiting a current flow into a haptic sensor circuit while charging the piezoelectric body; and monitoring for a haptic input to the piezoelectric body using the haptic sensor circuit while the piezoelectric body is charged; wherein limiting the current flow into the haptic sensor circuit comprises diverting at least a portion of the current flow from into the haptic sensor circuit to a discharge node. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification