Self-capacitive fingerprint sensor with active amplified pixels
First Claim
1. A fingerprint sensor device, comprising:
- a substrate;
a fingerprint sensor disposed over the substrate, wherein the fingerprint sensor includes an array of sensor pixels configured to generate fingerprint data by sensing ridges and valleys of a surface of a finger contacting the fingerprint sensor device; and
a pressure sensor disposed over the substrate at a plane of the fingerprint sensor, wherein the pressure sensor is configured to detect a pressure from the finger to communicate an unlock signal to initiate fingerprint detection;
wherein the fingerprint sensor is configured to send the unlock signal, responsive to the detected touch from the finger, to a main processor to indicate a request to initiate fingerprint detection;
receive a response signal, responsive to the send unlock signal, from the main processor acknowledging that a mobile device is waking up; and
initiate a fingerprint detection responsive to the received response signal.
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Accused Products
Abstract
In one aspect, a fingerprint sensor device includes a substrate and a sensor chip disposed over the substrate. The sensor chip includes an array of sensor pixels configured to generate fingerprint data by sensing ridges and valleys of a surface of a finger contacting the fingerprint sensor device. Each sensor pixel includes a single sensor electrode an amplifier having an inverting terminal electrically connected to the sensor electrode and a non-inverting terminal electrically connected to a drive signal. The drive signal generates electric fields between the sensor electrode and at least one of the ridges and valleys of the surface of the finger contacting the fingerprint sensor device to generate a variable capacitor having a variable capacitance based at least partly on a distance between the sensor electrode and the at least one of the ridges and valleys of the finger.
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Citations
20 Claims
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1. A fingerprint sensor device, comprising:
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a substrate; a fingerprint sensor disposed over the substrate, wherein the fingerprint sensor includes an array of sensor pixels configured to generate fingerprint data by sensing ridges and valleys of a surface of a finger contacting the fingerprint sensor device; and a pressure sensor disposed over the substrate at a plane of the fingerprint sensor, wherein the pressure sensor is configured to detect a pressure from the finger to communicate an unlock signal to initiate fingerprint detection; wherein the fingerprint sensor is configured to send the unlock signal, responsive to the detected touch from the finger, to a main processor to indicate a request to initiate fingerprint detection;
receive a response signal, responsive to the send unlock signal, from the main processor acknowledging that a mobile device is waking up; and
initiate a fingerprint detection responsive to the received response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic device, comprising
a main processor; - and
a fingerprint sensor device, including; a substrate; a fingerprint sensor disposed over the substrate, wherein the fingerprint sensor includes an array of sensor pixels configured to generate fingerprint data by sensing ridges and valleys of a surface of a finger contacting the fingerprint sensor device; and a pressure sensor disposed over the substrate at a plane of the fingerprint sensor, wherein the pressure sensor is configured to detect a pressure from the finger to communicate an unlock signal to the main processor to unlock the electronic device and initiate fingerprint detection; wherein the fingerprint sensor is configured to send the unlock signal, responsive to the detected touch from the finger, to the main processor to indicate a request to initiate fingerprint detection;
receive a response signal, responsive to the send unlock signal, from the main processor acknowledging that a mobile device is waking up; and
initiate a fingerprint detection responsive to the received response signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of unlocking a mobile device, the method comprising:
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detecting, by a fingerprint sensor device in the mobile device, a touch from a finger; sending a wakeup signal, responsive to the detected touch from the finger, to a main processor of the mobile device to initiate wakeup of the mobile device; receiving a response signal, responsive to the send wakeup signal, from the main processor acknowledging that the mobile device is waking up; and initiating a fingerprint detection responsive to the received response signal. - View Dependent Claims (18, 19, 20)
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Specification