Wearable electronic device and method for detecting contact of living body to wearable electronic device

1. A wearable electronic device, comprising:

a first electrode, a second electrode and a third electrode;

first circuitry including bias circuitry and electrode connection detecting circuitry; and

a processor configured to determine an operation state of the wearable electronic device for biometric signal measurement based on a first or a second operation state information received from the first circuitry,

wherein the first circuitry is configured to:

for detecting that the first electrode contacts a first portion of a living body without any contact between the living body and the third electrode:

output, via the bias circuitry, a first voltage to the second electrode for application of the first voltage to the first electrode,

compare a first reference voltage with the first voltage output from the first electrode, thereby resulting in a first comparison result, and

output, via the electrode connection detecting circuitry, the first operation state information indicating that the first electrode contacts the first portion of the living body without any contact between the living body and the third electrode, based on the first comparison result; and

for detecting that the third electrode contacts a second portion of the living body while the first electrode contacts the first portion of the living body:

output, via the bias circuitry, a second voltage to the second electrode for application of the second voltage to the first electrode and for application of the second voltage to the third electrode,

compare the first reference voltage with the second voltage output from the first electrode, thereby resulting in a second comparison result,

compare a second reference voltage with the second voltage output from the third electrode, thereby resulting in a third comparison result, and

output, via the electrode connection detecting circuitry, the second operation state information indicating that the third electrode contacts a second portion of the living body while the first electrode contacts the first portion of the living body, based on the second comparison result, and the third comparison result.

2. The wearable electronic device of claim 1 ,

wherein the first circuitry obtains first biometric signal for measuring a heartrate, and a second biometric signal that is an electrocardiogram.

3. The wearable electronic device of claim 2 , wherein the first circuitry is configured to, when the first electrode and the third electrode contact no portion of the living body, output, to the processor, a third operation state information indicating that the operation state of the wearable electronic device is a biometric signal measurement-stopped state, based on no voltage output from the third electrode and the first electrode.

4. The wearable electronic device of claim 1 , wherein the first circuitry further comprises:

a measuring circuitry configured to measure a biometric signal using one or more differences between potential values measured at the first electrode and the third electrode.

5. The wearable electronic device of claim 4 , wherein the electrode connection detecting circuitry includes:

first connection detecting circuitry configured to provide the first comparison result or to provide the second comparison result; and

second connection detecting circuitry configured to provide the third comparison result.

6. The wearable electronic device of claim 1 , wherein the first electrode and the second electrode are placed in positions of the wearable electronic device, wherein the first electrode and the second electrode are configured to contact the first portion of the living body, and

wherein the third electrode is configured to contact the second portion of the living body in a position different from the positions of the first electrode and the second electrode.

7. The wearable electronic device of claim 1 , further comprising:

a memory configured to store biometric information; and

a display configured to display the biometric information.

8. The wearable electronic device of claim 1 , wherein the processor is configured to:

upon receiving the first operation state information, switch to a biometric signal measurement-ready state;

maintain a session for the biometric signal measurement-ready state; and

upon receiving the second operation state information while maintaining the session for the biometric signal measurement-ready state, automatically switch to a biometric signal measurement-capable state to measure a biometric signal.

9. The wearable electronic device of claim 1 , wherein the processor is configured to:

upon receiving the first operation state information, display first visual information related to a biometric signal measurement-ready state of the wearable electronic device, via a user interface (UI); and

upon receiving the second operation state information while displaying the first visual information related to the biometric signal measurement-ready state via the UI, display second visual information related to a biometric signal measurement-capable state of the wearable electronic device via the UI.

10. The wearable electronic device of claim 1 , wherein the processor is configured to, upon receiving a third operation state information indicating that the operation state of the wearable electronic device is a biometric signal measurement-stopped state, switch to the biometric signal measurement-stopped state.

11. A method for detecting contact of a living body to a wearable electronic device including a first electrode, a second electrode and a third electrode, the method comprising:

for detecting that the first electrode contacts a first portion of the living body without any contact between the living body and the third electrode:

outputting a first voltage to the second electrode for application of the first voltage to the first electrode,

comparing a first reference voltage with the first voltage output from the first electrode, thereby resulting in a first comparison result, and

outputting a first operation state information indicating that the first electrode contacts the first portion of a living body without any contact between the living body and the third electrode, based on the first comparison result;

for detecting that the third electrode contacts a second portion of the living body while the first electrode contacts the first portion of the living body:

outputting a second voltage different from the first voltage to the second electrode for application of the second voltage to the first electrode and for application of the second voltage to the third electrode,

comparing the first reference voltage with the second voltage output from the first electrode, thereby resulting in a second comparison result,

comparing a second reference voltage with the second voltage output from the third electrode, thereby resulting in a third comparison result, and

outputting a second operation state information indicating that the third electrode contacts a second portion of the living body while the first electrode contacts the first portion of the living body, based on the second comparison result and the third comparison result; and

determining an operation state of the wearable electronic device for biometric signal measurement based on the first operation state information or the second operation state information.

12. The method of claim 11 , further comprising:

obtaining a first biometric signal for measuring a heart rate, and a second biometric signal that is an electrocardiogram.

13. The method of claim 12 , further comprising, when the first electrode and the third electrode contact no portion of the living body, outputting a third operation state information indicating that the operation state of the wearable electronic device is a biometric signal measurement-stopped state, based on no voltage output from the third electrode and the first electrode.

14. The method of claim 11 , wherein the first electrode and the second electrode are placed in positions of the wearable electronic device, and wherein the first electrode and the second electrode are configured to contact the first portion of the living body.

15. The method of claim 14 , wherein the third electrode is configured to contact a second portion of the living body in a position different from the positions of the first electrode and the second electrode.

16. The method of claim 11 , further comprising:

upon receiving the first operation state information, switching to a biometric signal measurement-ready state;

maintaining a session for the biometric signal measurement-ready state; and

upon receiving the second operation state information while maintaining the session for the biometric signal measurement-ready state, automatically switching to a biometric signal measurement-capable state to measure a biometric signal.

17. The method of claim 11 , further comprising:

upon receiving the first operation state information, displaying first visual information related to a biometric signal measurement-ready state of the wearable electronic device, via a user interface (UI); and

upon receiving the second operation state information while displaying the first visual information related to the biometric signal measurement-ready state via the UI, displaying second visual information related to a biometric signal measurement-capable state of the wearable electronic device via the UI.

18. The method of claim 11 , further comprising, upon receiving a third operation state information indicating that the operation state of the wearable electronic device is a biometric signal measurement-stopped state, switching to the biometric signal measurement-stopped state.