Biometric sensor chip having distributed sensor and control circuitry
First Claim
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1. A biometric sensor, comprising:
- a capacitive sensor array configured to image biometric data and formed on a first side of a substrate, the sensor array comprising;
a first plurality of electrical traces defining a plurality of rows;
a second plurality of electrical traces defining a plurality of columns, the plurality of columns intersecting the plurality of rows, thereby defining a plurality of intersections; and
a capacitive sensing element formed at each of the plurality of intersections;
at least one circuit formed on a second opposing side of the substrate and configured to communicate with the sensor array; and
a plurality of vias extending through the substrate to electrically connect the sensor array to the at least one circuit;
whereineach of the plurality of vias underlies an electrical trace chosen from the first or the second plurality of electrical traces.
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Abstract
A sensor includes a sensor array formed on a first side of a substrate and at least one circuit operative to communicate with the sensor array formed on a second side of the substrate. At least one via extends through the substrate to electrically connect the sensor array to the at least one circuit. Placing the at least one circuit on the second side of the substrate allows the sensor array to occupy substantially all of the first side of the substrate.
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Citations
16 Claims
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1. A biometric sensor, comprising:
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a capacitive sensor array configured to image biometric data and formed on a first side of a substrate, the sensor array comprising; a first plurality of electrical traces defining a plurality of rows; a second plurality of electrical traces defining a plurality of columns, the plurality of columns intersecting the plurality of rows, thereby defining a plurality of intersections; and a capacitive sensing element formed at each of the plurality of intersections; at least one circuit formed on a second opposing side of the substrate and configured to communicate with the sensor array; and a plurality of vias extending through the substrate to electrically connect the sensor array to the at least one circuit;
whereineach of the plurality of vias underlies an electrical trace chosen from the first or the second plurality of electrical traces. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A fingerprint sensor, comprising:
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a sensor array comprising biometric sensing elements formed on a first side of a substrate, the sensor array comprising; a first plurality of electrical traces defining a plurality of rows; and a second plurality of electrical traces defining a plurality of columns, the plurality of columns intersecting the plurality of rows to define a plurality of intersections; wherein a respective biometric sensing element is formed at each of the plurality of intersections and each biometric sensing element is configured to image a fingerprint; at least one circuit formed on a second opposing side of the substrate and configured to communicate with the sensor array; and a plurality of vias extending through the substrate to electrically connect the sensor array to the at least one circuit, wherein each of the plurality of vias is formed at a unique end of one of the plurality of rows and the plurality of columns. - View Dependent Claims (8)
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9. A fingerprint sensor, comprising:
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a sensor array configured to capture fingerprint data and formed on a first side of a substrate, the sensor array comprising; a first plurality of electrical traces defining a plurality of rows; and a second plurality of electrical traces defining a plurality of columns, the plurality of columns intersecting the plurality of rows, thereby defining a plurality of intersections; and a capacitive sensing element formed at each of the plurality of intersections; at least one circuit formed on a second opposing side of the substrate and operative to communicate with the sensor array; and a plurality of vias extending through the substrate to electrically connect the sensor array to the at least one circuit, wherein each of the plurality of vias underlies a trace chosen from the first or second plurality of traces. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An electronic device, comprising:
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a cover layer; and a fingerprint sensor positioned below the cover layer, the fingerprint sensor comprising; a sensor array configured to image fingerprint data and formed on a first side of a substrate, the sensor array comprising; a first plurality of electrical traces defining a plurality of rows; a second plurality of electrical traces defining a plurality of columns, the plurality of columns intersecting the plurality of rows to define a plurality of intersections; and a capacitive sensing element formed at each of the plurality of intersections; at least one circuit formed on a second opposing side of the substrate and operative to communicate with the sensor array; and a plurality of vias extending through the substrate to electrically connect the sensor array to the at least one circuit;
whereineach of the plurality of vias underlies an electrical trace chosen from the first or the second plurality of electrical traces;
oreach of the plurality of vias is formed at a unique end of one of the plurality of rows and the plurality of columns. - View Dependent Claims (16)
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Specification