Capacitive sensor architecture for biometric sensing
First Claim
1. A capacitive sensor, comprising:
- a plurality of rows of sensor electrodes included in a first layer;
a plurality of columns of sensor electrodes included in a second layer, wherein the plurality of columns of sensor electrodes are arranged orthogonally to the plurality of rows of sensor electrodes to form a two-dimensional sensing array; and
a plurality of conductive elements included in a third layer disposed between the first layer and the second layer, wherein, for each conductive element of the plurality of conductive elements, a first end of the conductive element is electrically connected to a sensor electrode in the plurality of rows of sensor electrodes and a second end of the conductive element is capacitively coupled to a sensor electrode in the plurality of columns of sensor electrodes to form a trans-capacitive sensing pixel of the two-dimensional sensing array.
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Accused Products
Abstract
A capacitive sensor a method of making a capacitive sensor are disclosed. The capacitive sensor includes: a plurality of rows of sensor electrodes included in a first layer; a plurality of columns of sensor electrodes included in a second layer, where the plurality of columns of sensor electrodes are arranged orthogonally to the plurality of rows of sensor electrodes to form a two-dimensional sensing array; and, a plurality of conductive elements included in a third layer disposed between the first and second layers, wherein, for each conductive element of the plurality of conductive elements, a first end of the conductive element is electrically connected to a sensor electrode in the plurality of rows of sensor electrodes and a second end of the conductive element is capacitively coupled to a sensor electrode in the plurality of columns of sensor electrodes to form a trans-capacitive sensing pixel of the two-dimensional sensing array.
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Citations
20 Claims
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1. A capacitive sensor, comprising:
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a plurality of rows of sensor electrodes included in a first layer; a plurality of columns of sensor electrodes included in a second layer, wherein the plurality of columns of sensor electrodes are arranged orthogonally to the plurality of rows of sensor electrodes to form a two-dimensional sensing array; and a plurality of conductive elements included in a third layer disposed between the first layer and the second layer, wherein, for each conductive element of the plurality of conductive elements, a first end of the conductive element is electrically connected to a sensor electrode in the plurality of rows of sensor electrodes and a second end of the conductive element is capacitively coupled to a sensor electrode in the plurality of columns of sensor electrodes to form a trans-capacitive sensing pixel of the two-dimensional sensing array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making a capacitive sensor, the method comprising:
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forming a first conductive layer on a first dielectric layer, wherein the first conductive layer includes a plurality of rows of sensor electrodes; forming a second dielectric layer over the first conductive layer; forming a second conductive layer over the second dielectric layer, wherein the second conductive layer includes a plurality of columns of sensor electrodes, and the plurality of columns of sensor electrodes are arranged orthogonally to the plurality of rows of sensor electrodes to form a two-dimensional sensing array; and forming a plurality of conductive vias in the second dielectric layer between the first conductive layer and the second conductive layer, wherein, for each conductive via of the plurality of conductive vias, a first end of the conductive via is electrically connected to a sensor electrode in the plurality of rows of sensor electrodes and a second end of the conductive via is capacitively coupled to a sensor electrode in the plurality of columns of sensor electrodes to form a trans-capacitive sensing pixel of the two-dimensional sensing array. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A capacitive sensor, comprising:
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a first layer comprising a plurality of rows of transmitter electrodes; a second layer disposed above the first layer comprising a plurality of columns of receiver electrodes, wherein the plurality of columns of transmitter electrodes overlap the plurality of rows of receiver electrodes to form a two-dimensional sensing array having a resolution configured to capture features of an input; a plurality of conductive vias between the first layer to the second layer, the plurality of conductive vias comprising a conductive via disposed at a sensing pixel of the two-dimensional sensing array, wherein the conductive via has a first end capacitively coupled to a receiver electrode in the plurality of columns of receiver electrodes and a second end electrically connecting a transmitter electrode of the plurality of rows of transmitter electrodes; a cover layer disposed above the second layer, wherein the cover layer comprises a top surface that forms an input surface for the input and a dielectric separating the top surface from the conductive vias and the second layer; driver circuitry connected to the transmitter electrodes, wherein the driver circuitry is configured to drive a transmitter signal onto the transmitter electrodes; and receiver circuitry connected to the receiver electrodes, wherein the receiver circuitry is configured to process resulting signals corresponding to the transmitter signals, wherein the resulting signals vary based on presence of the input at the top surface of the cover layer. - View Dependent Claims (17, 18, 19, 20)
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Specification