Interleaved piezoelectric tactile interface
First Claim
1. An interface, comprising:
- a first signal layer having a plurality of rows of sensing regions aligned in a first direction;
a second signal layer having a plurality of columns of sensing regions aligned in a second direction;
a plurality of piezoelectric regions, each piezoelectric region being positioned at an intersection of a row and a column, at least one piezoelectric region generating a voltage when deformed by tactile input;
a sensing circuit coupled the first and second signal layers configured to determine a tactile input from signals generated by at least one of the piezoelectric regions in the interface; and
a voltage recovery circuit coupled to at least one of the piezoelectric regions configured to receive the voltage generated in the interface by the tactile input and charge a battery coupled to the voltage recovery circuit.
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Abstract
A piezoelectric tactile input device and method in a computing environment. An embodiment disclosed herein includes a touch screen having several piezoelectric regions within a piezoelectric material layer that may generate a voltage when deformed in a localized area. The piezoelectric layer may be disposed between sensor layers of rows and columns of sensor traces for detecting the voltage generated at any particular piezoelectric region. The detected voltage signals may then be used to extrapolate the position of the localized area in which the piezoelectric layer was deformed (e.g., from a finger touch or a stylus). Further, because the piezoelectric layer generates a greater voltage in the presence of a greater pressure, the device may further decipher a relative level of force for the tactile input on the touch screen and detect multiple touch locations.
156 Citations
20 Claims
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1. An interface, comprising:
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a first signal layer having a plurality of rows of sensing regions aligned in a first direction; a second signal layer having a plurality of columns of sensing regions aligned in a second direction; a plurality of piezoelectric regions, each piezoelectric region being positioned at an intersection of a row and a column, at least one piezoelectric region generating a voltage when deformed by tactile input; a sensing circuit coupled the first and second signal layers configured to determine a tactile input from signals generated by at least one of the piezoelectric regions in the interface; and a voltage recovery circuit coupled to at least one of the piezoelectric regions configured to receive the voltage generated in the interface by the tactile input and charge a battery coupled to the voltage recovery circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computing device, comprising
a processor; -
a display coupled to the processor and configured to display graphics under the control of the processor; a touch screen overlaying the display and coupled to the processor;
the touch screen including;a first signal layer having a plurality of rows of sensing regions aligned in a first direction; a second signal layer having a plurality of columns of sensing regions aligned in a second direction; a plurality of piezoelectric regions, each piezoelectric region being positioned at an intersection of a row and a column, at least one piezoelectric region generating a voltage when deformed by tactile input; and a sensing circuit coupled the first and second signal layers configured to determine the tactile input from signals generated by at least one of the piezoelectric regions in the touch screen; a voltage recovery circuit coupled to at least one of the piezoelectric regions in the touch screen configured to receive the voltage generated in the touch screen; and a battery coupled to the voltage recovery circuit and configured to be charged by the voltage generated in the touch screen. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An interface, comprising:
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a piezoelectric layer configured to overlay a display, the piezoelectric layer having at least one piezoelectric region generating a voltage when deformed by tactile input; a plurality of sensors disposed in a pattern over the piezoelectric layer, the sensors configured to sense signals generated by the piezoelectric layer in the interface; a sensing circuit coupled to the piezoelectric layer and configured to determine the tactile input from signals sensed by the sensors in the interface; and a voltage recovery circuit coupled to the piezoelectric layer configured to receive a voltage generated in the interface by tactile input to the at least one piezoelectric region and charge a battery coupled to the voltage recovery circuit. - View Dependent Claims (17, 18, 19, 20)
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Specification