Apparatus and method for recognizing fingerprint

1. An electronic device comprising:

a circuit board;

a fingerprint recognition sensor unit coupled to a first surface of the circuit board; and

a key button coupled to a second surface of the circuit board and configured to transfer a signal to a controller when an external force is applied to the key button and determine that a push of the key button has occurred when the signal is transferred from the key button,

wherein the key button comprises a key positioning unit including a pressing part, and

wherein the pressing part is formed of a pressing protrusion configured to protrude from a top surface of the key positioning unit and contact a second surface of a dome switch electrically connected to a second surface of the circuit board when an external force is applied to the key button.

2. The electronic device of claim 1 , wherein the fingerprint recognition sensor unit includes a concave surface.

3. The electronic device of claim 1 , further comprising;

a power supply interruption unit configured to interrupt power applied to the fingerprint recognition sensor unit and transmit a power supply interruption signal representing that the power applied to the fingerprint recognition sensor unit has been interrupted when an over-current is generated in the fingerprint recognition sensor unit.

4. The electronic device of claim 3 , wherein the controller is configured to switch off a power line of the fingerprint recognition sensor unit and output a message informing of a failure of the fingerprint recognition sensor unit when the power supply interruption signal is received.

5. The electronic device of claim 3 , wherein the controller is configured to output a message informing of a failure of the fingerprint recognition sensor unit when a function of fingerprint recognition using the fingerprint recognition sensor unit is requested.

6. The electronic device of claim 1 , wherein the key button comprises at least one of a home key and a side key of the electronic device.

7. The electronic device of claim 1 , wherein the fingerprint recognition sensor unit is formed of at least one of a swipe type fingerprint recognition sensor or an area type fingerprint recognition sensor.

8. The electronic device of claim 1 , further comprising a home-key deco part coupled to a front surface of the fingerprint recognition sensor unit and a urethane part coupled to a front surface of the home-key deco part, wherein the home-key deco part is configured to protect the fingerprint recognition sensor unit, and wherein the urethane part is configured to obstruct humidity introduced into the fingerprint recognition sensor unit.

9. A method of operating an electronic device comprising:

identifying an over-current in a fingerprint recognition sensor unit of a key button;

interrupting power applied to the fingerprint recognition sensor unit after identifying that the over-current has been generated; and

outputting a message informing of a failure of the fingerprint recognition sensor unit,

wherein the key button comprises a key positioning unit including a pressing part, and

wherein the pressing part is formed of a pressing protrusion configured to protrude from a top surface of the key positioning unit and contact a second surface of a dome switch electrically connected to a second surface of a circuit board when an external force is applied to the key button.

10. The method of claim 9 , further comprising:

outputting a message informing of a failure of the fingerprint recognition sensor unit when a function of fingerprint recognition using the fingerprint recognition sensor unit is requested,

wherein the fingerprint recognition sensor unit includes concave surface.

11. A method of operating an electronic device comprising:

identifying an over-current in a fingerprint recognition sensor unit of a key button; and

outputting a message informing of a failure of the fingerprint recognition sensor unit after identifying that the over-current has been generated,

wherein the key button comprises a key positioning unit including a pressing part, and

wherein the pressing part is formed of a pressing protrusion configured to protrude from a top surface of the key positioning unit and contact a second surface of a dome switch electrically connected to a second surface of a circuit board when an external force is applied to the key button.

12. The method of claim 11 , further comprising interrupting power applied to the fingerprint recognition sensor unit,

wherein the fingerprint recognition sensor unit includes concave surface.

13. The method of claim 11 , further comprising:

outputting a message informing of a failure of the fingerprint recognition sensor unit when a function of fingerprint recognition using the fingerprint recognition sensor unit is requested.

14. The method of claim 12 , further comprising interrupting power applied to the fingerprint recognition sensor unit after identifying that the over-current has been generated.

15. The method of claim 12 , further comprising generating a power supply interruption signal representing that the power applied to the fingerprint recognition sensor has been interrupted.

16. The method of claim 12 , further comprising switching off a power line of the fingerprint recognition sensor unit when a power supply interruption signal is received.

17. The method of claim 9 , further comprising generating a power supply interruption signal representing that the power applied to the fingerprint recognition sensor has been interrupted.

18. The method of claim 17 , further comprising switching off a power line of the fingerprint recognition sensor unit when a power supply interruption signal is received.

19. The electronic device of claim 1 , wherein the fingerprint recognition sensor unit is configured to detect a user's fingerprint at a plurality of angles.

20. The electronic device of claim 1 , further comprising an ultraviolet coating disposed on top of the fingerprint recognition sensor unit.