Wearable electronic device

Abstract

A consumer product that is a portable and, in some cases, a wearable electronic device. The wearable electronic device may have functionalities including: keeping time; monitoring a user's physiological signals and providing health-related information based on those signals; communicating with other electronic devices or services; visually depicting data on a display; gather data form one or more sensors that may be used to initiate, control, or modify operations of the device; determine a location of a touch on a surface of the device and/or an amount of force exerted on the device, and use either or both as input.

1 - 20 . (canceled) 
     
     
         21 . An electronic watch comprising:
 a touch-sensitive display;   a housing at least partially surrounding the touch-sensitive display;   a front cover positioned over the touch-sensitive display at a front of the housing;   a rear cover positioned at a rear of the housing;   a light source positioned below the rear cover and configured to emit light through the rear cover;   a photodetector positioned below the rear cover and configured to produce a first signal in response to receiving a reflected portion of the light emitted by the light source;   a first electrode positioned at the rear of the housing and configured to produce a second signal;   a second electrode positioned at a side of the housing and configured to produce a third signal; and   a processing unit operably coupled to the photodetector and the first and second electrodes, the processing unit configured to compute a first health metric using the first signal produced by the photodetector and configured to compute a second health metric using the second and third signals produced by the first and second electrodes, respectively.   
     
     
         22 . The electronic watch of  claim 21 , wherein:
 the light source and the photodetector are configured to operate as a photoplethysmography sensor; and   the first health metric is a heart rate.   
     
     
         23 . The electronic watch of  claim 21 , wherein:
 the first electrode and the second electrode are configured to operate as an electrocardiographic sensor; and   the second health metric is an electrocardiograph.   
     
     
         24 . The electronic watch of  claim 21 , wherein:
 the photodetector is a first photodetector of a set of photodetectors; and   the set of photodetectors is arranged around a central region of the rear cover.   
     
     
         25 . The electronic watch of  claim 21 , wherein:
 the housing defines a rear housing surface;   the rear cover defines a cover surface that extends outward from the rear housing surface of the housing;   the rear cover defines a first window positioned over the light source and a second window positioned over the photodetector; and   the first window and the second window are positioned along the cover surface that extends outward from the rear housing surface of the housing.   
     
     
         26 . The electronic watch of  claim 21 , wherein the electronic watch further comprises a temperature sensor configured to measure body temperature. 
     
     
         27 . The electronic watch of  claim 21 , wherein:
 the electronic watch further comprises a speaker; and   the speaker is configured to produce an audio output in response to a touch detected by the touch-sensitive display.   
     
     
         28 . The electronic watch of  claim 21 , further comprising a power interface positioned at the rear of the housing and configured to receive power from an external charging device. 
     
     
         29 . The electronic watch of  claim 21  wherein:
 the electronic watch further comprises a near-field communication interface configured to communicate wirelessly with an external payment device; and 
 the electronic watch is configured to authorize a purchase with the external payment device using the near-field communication interface. 
 
     
     
         30 . A wearable electronic device comprising:
 a housing defining a first portion of a rear surface and aside surface of the wearable electronic device;   a front cover coupled to the housing and defining a front surface of the wearable electronic device;   a touch-sensitive display positioned below the front cover;   a rear cover coupled to the housing and defining a second portion of the rear surface of the wearable electronic device;   a light source configured to emit light through the rear cover;   a photodetector configured to detect reflected light in response to the emission of the light by the light source;   a first electrode positioned at the rear surface of the wearable electronic device;   a second electrode positioned at the side surface of the wearable electronic device; and   a processing unit operably coupled to the photodetector and configured to compute a first health metric in response to the reflected light detected by the photodetector and configured to compute a second health metric in response to signals received by the first and second electrodes.   
     
     
         31 . The wearable electronic device of  claim 30 , wherein:
 the first health metric is a heart rate of a user; and   the second health metric is an electrocardiogram of the user.   
     
     
         32 . The wearable electronic device of  claim 30 , wherein the second portion of the rear surface defined by the rear cover protrudes with respect to the first portion of the rear surface defined by the housing. 
     
     
         33 . The wearable electronic device of  claim 32 , wherein:
 the rear cover defines a set of windows arranged along the second portion of the rear surface;   the light source is positioned below a first window of the set of windows; and   the photodetector is positioned below a second window of the set of windows.   
     
     
         34 . The wearable electronic device of  claim 33 , wherein:
 the photodetector is a first photodetector of a set of photodetectors; and   each photodetector of the set of photodetectors is positioned below a respective window of the set of windows.   
     
     
         35 . A wearable electronic device comprising:
 a housing;   a touch-sensitive display at least partially surrounded by the housing;   a rear cover coupled to the housing;   a light source configured to emit a light through the rear cover;   a photodetector configured to produce a first output in response to an emission of the light by the light source;   a first electrode positioned along a rear surface of the wearable electronic device and configured to produce a second output;   a second electrode positioned along a side surface of the wearable electronic device and configured to produce a third output; and   a processing unit operably coupled to the photodetector, the first electrode, and the second electrode, the processing unit configured to compute a first health metric in response to the first output and a second health metric in response to the second and third outputs.   
     
     
         36 . The wearable electronic device of  claim 35 , wherein the photodetector is configured to measure a change in light absorption by a region of skin of a user. 
     
     
         37 . The wearable electronic device of  claim 35 , wherein:
 the first health metric is a heart rate of a user based on a detected blood perfusion of the user; and   the second health metric is an electrocardiogram based on an electrical response of the user.   
     
     
         38 . The wearable electronic device of  claim 35 , wherein the first health metric is a blood oxygenation level of a user. 
     
     
         39 . The wearable electronic device of  claim 35 , wherein the first health metric is a respiration rate of a user. 
     
     
         40 . The wearable electronic device of  claim 35 , wherein the wearable electronic device further comprises a temperature sensor configured to measure a body temperature of a user.