NON-INVASIVE VITAL SIGNS MONITORING ON A MOBILE DEVICE USING AN UNDER-DISPLAY OPTICAL SENSOR

1 . An electronic device comprising:

a housing;

an electronic display attached to the housing comprising:

a first side configured to direct transmitted light toward a portion of a subject proximate the electronic display via organic light-emitting diodes (OLED); and

an optical sensor disposed within the housing, opposite the first side of the electronic display, and configured to receive reflected light off the portion of the subject;

wherein one or more vital signs of the subject are determined based at least in part on the reflected light.

2 . The electronic device of claim 1 , wherein no portion of the optical sensor is visible from the first side of the electronic display.

3 . The electronic device of claim 1 , wherein the reflected light is light emitted from the electronic display via organic light-emitting diodes.

4 . The electronic device of claim 3 , wherein the optical sensor is enabled in an instance in which the electronic display is illuminated under the portion of the subject, and

wherein the optical sensor is disabled in an instance in which the electronic display is not illuminated under the portion of the subject.

5 . The electronic device of claim 4 , wherein the optical sensor receives a synchronization signal indicating a start of an electronic display refresh, and

wherein the optical sensor is enabled based at least in part on the synchronization signal.

6 . The electronic device of claim 1 , wherein the one or more vital signs comprise at least a heart rate.

7 . The electronic device of claim 6 , wherein the heart rate is determined based at least in part on a period of the reflected light.

8 . The electronic device of claim 1 , wherein the one or more vital signs comprises at least one of heart rate variability and peripheral blood oxygen saturation.

9 . The electronic device of claim 1 , wherein an ambient light vital signs measurement is made by the optical sensor in an instance in which the electronic display is not illuminated, and the one or more vital signs of the subject are determined based at least in part on the ambient light vital signs measurement.

10 . The electronic device of claim 1 , wherein the optical sensor is further configured to perform an ambient light operational measurement in an instance in which the optical sensor is not performing a vital signs measurement.

11 . A computer-implemented method comprising:

causing organic light-emitting diodes to transmit light from a first side of an electronic display toward a portion of a subject proximate the electronic display;

receiving, from an optical sensor disposed within a housing opposite the first side of the electronic display, an electronic signal representative of reflected light off the portion of the subject; and

determining one or more vital signs of the subject based at least in part on the reflected light.

12 . The computer-implemented method of claim 11 , wherein no portion of the optical sensor is visible from the first side of the electronic display.

13 . The computer-implemented method of claim 11 , further comprising:

determining an instance in which the electronic display is on; and

receiving, from the optical sensor, the electronic signal representative of the reflected light off the portion of the subject while the display is on.

14 . The computer-implemented method of claim 13 , further comprising:

receiving a synchronization signal indicting a start of an electronic display refresh,

wherein determining the instance in which the electronic display is on is based at least in part on the synchronization signal.

15 . The computer-implemented method of claim 14 , further comprising:

receiving, from the optical sensor, the electronic signal representative of the reflected light off the portion of the subject, while the display is on proximate the portion of the subject.

16 . The computer-implemented method of claim 15 , further comprising:

receiving, from the optical sensor while the display is off, an ambient electronic signal representative of an ambient light in a surrounding environment; and

updating one or more vital signs of the subject based at least in part on the ambient light in the surrounding environment.

17 . The computer-implemented method of claim 11 , further comprising:

determining a period of the reflected light; and

calculating a heart rate based at least in part on the period of the reflected light.

18 . A mobile device system comprising:

a mobile device housing;

an organic light-emitting diode (OLED) electronic display attached to the housing comprising:

a first side configured to direct transmitted light toward a portion of a subject proximate the electronic display;

an optical sensor disposed within the housing, opposite the first side of the electronic display, and configured to receive reflected light off the portion of the subject; and

a host processor, disposed within the housing and electrically connected to the optical sensor, the host processor comprising:

a processor; and

an instruction memory including program code, the instruction memory and program code configured to, with the processor, cause the host processor to:

cause the electronic display to transmit light from the first side of the electronic display toward a portion of the subject proximate the electronic display;

receive, from the optical sensor disposed within the housing opposite the first side of the electronic display, an electronic signal representative of the reflected light off the portion of the subject; and

determine one or more vital signs of the subject based at least in part on the reflected light.

19 . The mobile device system of claim 18 , wherein no portion of the optical sensor is visible from the first side of the electronic display.

20 . The mobile device system of claim 18 , wherein the host processor:

receives, from the optical sensor, the electronic signal representative of the reflected light off the portion of the subject in an instance in which the electronic display is illuminated under the portion of the subject, and

determines one or more vital signs of the subject based at least in part on the electronic signal.