Human-computer interface system

1. A fingerprint sensor system comprising:

a substrate;

a first multi-layer inductor arranged across a set of layers of the substrate;

a cover layer arranged over the substrate defining a touch sensor surface;

a fingerprint reader:

arranged within the substrate below the cover layer, the first multi-layer inductor encircling the fingerprint reader within the substrate; and

configured to permeate through the cover layer to scan a fingerprint applied over the cover layer; and

a first magnetic element:

defining a first polarity facing the first multi-layer inductor; and

configured to inductively couple the first multi-layer inductor responsive to application of a touch input on the touch sensor surface.

2. The system of claim 1 , further comprising a controller configured to:

read a first set of electrical values from the first multi-layer inductor; and

in response to detecting a first touch input on the touch sensor surface based on the first set of electrical values:

read a first set of fingerprint values from the fingerprint reader;

generate a first fingerprint image based on the first set of fingerprint values; and

in response to the first fingerprint image deviating from a target fingerprint image, trigger a first oscillating voltage across the first multi-layer inductor during a first haptic feedback cycle to induce alternating magnetic coupling between the first multi-layer inductor and the first magnetic element and oscillate the cover layer.

3. The system of claim 2 , wherein the controller is configured to, in response to detecting the first change in electrical value at the first multi-layer inductor based on the first set of electrical values:

read a first set of capacitance values from the fingerprint reader for the touch input applied on the cover layer;

interpret the touch input as a fingerprint input;

interpret a first set of ridges for the fingerprint input based on the first set of capacitance values;

interpret a first set of valleys for the fingerprint input based on the first set of capacitance values; and

compile the first set of ridges and the first set of valleys into the first fingerprint image.

4. The system of claim 1 , further comprising a controller configured to, in response to detecting the first change in electrical value at the first multi-layer inductor based on the first set of electrical values:

read a first set of fingerprint values from the fingerprint reader;

generate a first fingerprint image based on the first set of fingerprint values; and

in response to the first fingerprint image matching a target fingerprint image, trigger a first oscillating voltage across the first multi-layer inductor during a first haptic feedback cycle to induce alternating magnetic coupling between the first multi-layer inductor and the first magnetic element and oscillate the cover layer.

5. The system of claim 1 :

wherein the substrate comprises a bottom layer comprising a set of sense electrodes;

further comprising:

a baseplate comprising a set of drive electrodes:

arranged across the top surface of the baseplate;

arranged in alignment with the set of sense electrodes at the bottom layer of the substrate; and

configured to capacitively couple the set of sense electrodes to form a set of capacitive force sensors and effect capacitance values of the set of sense electrodes responsive to displacement of the substrate toward the baseplate; and

a controller configured to, in response to detecting a first change in electrical value at the first multi-layer inductor based on a first set of electrical values output by the multi-layer inductor:

read a second set of electrical values from the set of capacitive force sensors;

detect presence of the touch input on the cover layer;

interpret a first force magnitude for the touch input based on the second set of electrical values; and

in response to the first force magnitude exceeding a target force magnitude, register the touch input applied to the cover layer.

6. The system of claim 1 :

wherein the substrate comprises:

a first layer comprising:

a first cutout; and

a first spiral trace coiled in a first direction about the first cutout; and

a second layer comprising:

a second cutout arranged in alignment with the first cutout to define an aperture of the substrate; and

a second spiral trace:

coiled in a second direction, opposite the first direction, about the second cutout;

electrically coupled to the first spiral trace; and

cooperating with the first spiral trace to form the first multi-layer inductor; and

wherein the fingerprint reader is arranged proximal the aperture of the substrate.

7. The system of claim 1 , further comprising a controller configured to:

access a first set of electrical values from the first multi-layer inductor, the first set of electrical values representing voltage across the first multi-layer inductor;

detect a first change in electrical value comprising a first voltage of a first polarity across the first multi-layer inductor;

register the touch input on the cover layer in response to detecting the first voltage of the first polarity across the first inductor at a first time;

interpret a first force magnitude for the touch input based on the first voltage of the first polarity;

trigger a first oscillating voltage across the first multi-layer inductor during a first haptic feedback cycle in response to the first force magnitude exceeding a target force magnitude and in response to a first fingerprint input deviating from a target fingerprint input;

detect a second voltage of a second polarity, opposite the first polarity, across the first multi-layer inductor at a second time succeeding the first time;

register release of the touch input from the cover layer in response to detecting the second voltage at the second polarity across the first multi-layer inductor; and

trigger a second oscillating voltage, different from the first oscillating voltage, across the first multi-layer inductor during a second haptic feedback cycle in response to registering release of the touch input from the cover layer.

8. The system of claim 1 :

further comprising a baseplate arranged below the substrate;

wherein the first magnetic element is coupled to the baseplate and faces the first multi-layer inductor; and

further comprising a set of spacer elements, each spacer element in the set of spacer elements:

coupled to a top surface of the baseplate;

supporting the substrate over the baseplate; and

configured to:

compress during application of a force on the cover layer; and

yield to oscillation of the substrate responsive to oscillating voltage across the first multi-layer inductor during a haptic feedback cycle.

9. The system of claim 8 :

wherein the substrate comprises a set of sense electrodes arranged proximal the set of spacer elements;

wherein the baseplate comprises a set of drive electrodes:

arranged across the top surface of the baseplate and in alignment with the set of sense electrodes; and

configured to capacitively couple the set of sense electrodes to form a set of capacitive force sensors and effect capacitance values of the set of sense electrodes responsive to displacement of the substrate toward the baseplate; and

further comprising a controller configured to, in response to detecting a first change in electrical value at the first multi-layer inductor:

read a second set of electrical values from the set of capacitive force sensors;

interpret a first force magnitude for the touch input based on the second set of electrical values; and

in response to the first force magnitude exceeding a target force magnitude, register the touch input applied to the cover layer.

10. The system of claim 1 :

further comprising a touch sensor layer:

interposed between the substrate and the cover layer; and

comprising an array of drive and sense electrode pairs;

wherein the fingerprint reader is bonded to a bottom surface of the touch sensor layer; and

further comprising a controller configured to:

read a first electrical value from the array of drive and sense electrode pairs;

detect presence of the touch input on the cover layer based on the first electrical value deviating from a baseline electrical value; and

in response to detecting presence of the touch input on the cover layer, read a first set of electrical values from the first multi-layer inductor.

11. The system of claim 10 , wherein the controller is further configured to, in response to detecting the touch input on the touch sensor surface, based on the first set of electrical values:

read a first set of fingerprint values from the fingerprint reader; and

in response to the first set of fingerprint values deviating from a target set of fingerprint values, trigger a first oscillating voltage across the first multi-layer inductor during a first haptic feedback cycle to induce alternating magnetic coupling between the first multi-layer inductor and the first magnetic element and oscillate the cover layer.

12. The system of claim 1 :

further comprising a keyboard chassis;

wherein the substrate:

is arranged within the keyboard chassis; and

comprises an array of multi-layer inductors comprising the first multi-layer inductor;

wherein the cover layer defines an array of key locations over the array of multi-layer inductors, the array of key locations comprising a fingerprint key location arranged over the first multi-layer inductor; and

further comprising an array of magnetic elements arranged on the keyboard chassis and facing the array of multi-layer inductors at the array of key locations, the array of magnetic elements comprising the first magnetic element.

13. The system of claim 1 :

wherein the first multi-layer inductor cooperates with the first magnetic element to form a speaker configured to broadcast audible feedback responsive to magnetic coupling between the first multi-layer inductor and the first magnetic element; and

further comprising a controller configured to:

trigger an oscillating voltage at a first frequency concurrent the first oscillating voltage during a first haptic feedback cycle to induce alternating magnetic coupling between the first multi-layer inductor and the first magnetic element and broadcast an audible feedback tone from the speaker.