Wearable mobile device and method of measuring biological signal with the same

1. A method of measuring a biosignal, the method comprising:

determining whether an attached wearable mobile device is closely attached to a user or loosely attached to the user; and

providing a biosignal-based service in response to the wearable mobile device being determined to be closely attached to the user and providing a non-biosignal-based service to the user in response to the wearable mobile device being determined to be loosely attached to the user,

wherein the determining comprises:

measuring a range or a position at which the wearable mobile device contacts the user;

determining that the wearable mobile device is closely attached to the user in response to the measured range satisfying a standard value or in response to the measured position corresponding to a skin area of the user; and

determining that the wearable mobile device is loosely attached to the user when the wearable mobile device is located at a wrist area of the user; and

wherein the standard value and the skin area of the user correspond to the wearable mobile device being positioned at a skin area of the user that has greater circumference than a wrist area of the user.

2. The method of claim 1 , wherein the providing of the biosignal-based service comprises:

executing a program for measuring a biosignal from the user or a program that uses a measured biosignal; and

providing a result from the executed program as the biosignal-based service.

3. A wearable mobile device method, the method comprising:

determining whether a bracelet, as a wearable mobile device, is closely attached to a user or loosely attached to the user based on a positioning of the bracelet while the bracelet is attached to the user; and

sensing a biosignal from the user by activating a sensor, configured to sense the biosignal from the user, of the bracelet in response to the bracelet being determined to be closely attached to the user,

wherein the determining comprises:

measuring a range or position at which the bracelet contacts the user; and

determining that the bracelet is closely attached to the user in response to the measured range satisfying a standard value or in response to the measured position corresponding to a skin area of the user; and

determining that the bracelet is loosely attached to the user when the bracelet is located at a wrist area of the user; and

wherein the standard value and the skin area of the user correspond to the wearable mobile device being positioned at a skin area of the user that has a greater circumference than a wrist area of the user.

4. The method of claim 3 , wherein the determining comprises:

determining that the bracelet is closely attached to the user in response to an analog front end of the sensor being in a lead-on state and determining that the bracelet is loosely attached to the user in response to the analog front end of the sensor being in a lead-off state, the analog front end of the sensor being arranged in the bracelet so that the lead-on state indicates that the sensor is in contact with a body portion of the user sufficient to sense the biosignal and the lead-off state indicates that that the sensor is not in contact with the body portion sufficient to sense the biosignal.

5. The method of claim 3 , wherein the determining comprises:

sending a microcurrent to the user through the analog front end of the sensor; and

determining that the bracelet is closely attached to the user in response to an impedance measured based on a return of the sent microcurrent satisfying the standard value and determining that the bracelet is loosely attached to the user in response to the measured impedance not satisfying the standard value.

6. The method of claim 3 , wherein the determining further comprises:

determining that the bracelet is closely attached to the user in response to an additional sensor of the bracelet, for determining whether the bracelet is closely attached or loosely attached to the user, entering an operating state based on a body position at which the bracelet is attached to the user.

7. The method of claim 3 , wherein the sensing comprises:

identifying which sensors of the bracelet to activate to sense respective biosignals based on the positioning of the bracelet while the bracelet is attached to the user; and

sensing the respective biosignals.

8. The method of claim 3 , further comprising:

in response to determining that the bracelet is closely attached to the user, executing a program associated with the biosignal or adjusting a system environment to be a predetermined value; and

in response to determining that the bracelet is loosely attached to the user, deactivating the sensor.

9. The method of claim 3 , further comprising:

outputting a result of the determining of whether the bracelet is closely or loosely attached to the user.

10. A wearable mobile device, comprising:

a bracelet, as the wearable mobile device, configured to be attached to a user by at least partially surrounding a body portion of the user;

a determiner configured to determine whether the bracelet is closely attached to the user or loosely attached to the user based on a positioning of the bracelet while the bracelet is attached to the user; and

a sensor unit comprising a sensor configured to sense a biosignal from the user subsequent to activation of the sensor in response to the determiner determining that the bracelet is closely attached to the user,

wherein the determiner is configured to measure a range or a position at which the wearable mobile device contacts the user;

to determine that the wearable mobile device is closely attached to the user in response to the measured range satisfying a standard value or in response to the measured position corresponding to a skin area of the user; and

to determine that the wearable mobile device is loosely attached to the user when the wearable mobile device is located at a wrist area of the user; and

wherein the standard value and the skin area of the user correspond to the wearable mobile device being positioned at a skin area of the user that has a greater circumference than the wrist area of the user.

11. The device of claim 10 , wherein the sensor includes an analog front end arranged in the bracelet so that a lead-on state of the sensor indicates that the sensor is in contact with a body portion of the user sufficient to sense the biosignal and so that a lead-off state of the sensor indicates that that the sensor is not in contact with the body portion sufficient to sense the biosignal, and

wherein the determiner is configured to determine that the bracelet is closely attached to the user in response to the analog front end being in the lead-on state and to determine that the bracelet is loosely attached to the user in response to the analog front end being in the lead-off state.

12. The device of claim 10 , wherein the determiner is configured to control the analog front end of the sensor to send a microcurrent to the user, and

wherein the determiner is configured to determine that the bracelet is closely attached to the user in response to an impedance measured based on a return of the sent microcurrent satisfying the standard value and determining that the bracelet is loosely attached to the user in response to the measured impedance not satisfying the standard value.

13. The device of claim 10 , wherein the bracelet further comprises an additional sensor for determining whether the bracelet is closely attached or loosely attached to the user, and

wherein the determiner is configured to determine that the bracelet is closely attached to the user in response to the additional sensor being activated based on a body position at which the bracelet is attached to the user.

14. The device of claim 10 , wherein the sensor unit is configured to selectively activate one or more sensors to sense respective biosignals based on the positioning of the bracelet while the bracelet is attached to the user and to sense the respective biosignals.

15. The device of claim 10 , further comprising:

a controller configured to, in response to the bracelet being determined to be closely attached to the user, execute a program associated with the biosignal or adjust a system environment to be a predetermined value, and, in response to the bracelet being determined to be loosely attached to the user, deactivate the sensor.

16. The device of claim 10 , further comprising:

an output unit configured to output a result of the determining of whether the bracelet is closely or loosely attached to the user.

17. The method of claim 1 , further comprising deactivating sensors of the wearable mobile device configured to sense a biosignal from the user in response to the wearable mobile device being determined to be loosely attached to the user.

18. The method of claim 3 , further comprising providing a biosignal-based service to the user in response to the bracelet being determined to be closely attached to the user and providing only non-biosignal-based services to the user in response to the bracelet being determined to be loosely attached to the user.

19. The method of claim 18 , further comprising deactivating the sensor in response to the bracelet being determined to be loosely attached to the user.

20. The device of claim 10 , further comprising a controller to control a providing of a biosignal-based service to the user in response to the bracelet being determined to be closely attached to the user and providing only non-biosignal-based services to the user in response to the bracelet being determined to be loosely attached to the user.

21. The device of claim 20 , wherein the controller is configured to control a deactivation of the sensor in response to the determiner determining that the bracelet is loosely attached to the user.