Reverse battery protection device and operating method thereof

1. A wearable device comprising:

a touch screen configured to display information;

an acceleration sensor configured to generate an acceleration signal;

an optical sensor comprising a light source and configured to generate a touch interrupt signal; and

a control unit configured to:

determine a wearing state of the wearable device based on the acceleration signal or the touch interrupt signal, the wearing state comprising a not-wearing state, a wrist-wearing state, or a hand-gripping state; and

execute a function corresponding to the determined wearing state;

display a first screen representing that the touch screen is turned off if the wearable device is in the not-wearing state,

display a second screen representing a watch screen if the wearable device is in the wrist wearing state, and

display a third screen including notification information if the wearable device is in the hand gripping state,

wherein each of the first screen, the second screen and the third screen is a lock screen or a lock release screen,

the lock screen is a screen for limiting an access of an application in the wearable device, and

the lock release screen is a screen for allowing the access of the application in the wearable device.

2. The wearable device of claim 1 , wherein the control unit is further configured to cause the touch screen to change the black screen or the ambient screen to a standby screen when a tilting movement of the wearable device is detected.

3. The wearable device of claim 1 , wherein:

the acceleration signal comprises an Absolute Motion Detection (AMD) signal and a Relative Motion Detection (RMD) signal corresponding to different types of movements; and

the control unit is further configured to determine the wearing state based on the AMD signal and the RMD signal.

4. The wearable device of claim 3 , wherein the control unit is further configured to determine the wrist-wearing state and the hand-gripping state based on the touch interrupt signal.

5. The wearable device of claim 3 , wherein the optical sensor is further configured to generate the touch interrupt signal when the wearing state is determined based on the AMD signal and the RMD signal.

6. The wearable device of claim 1 , wherein the control unit is further configured to cause the touch screen to:

display detailed content of the missed message in response to a knock code command input while the standby screen is displayed.

7. The wearable device of claim 1 , wherein:

the optical sensor is further configured to generate a heartbeat signal; and

the function corresponding to the wrist-wearing state comprises:

causing the touch screen to display a standby screen;

causing the touch screen to change the standby screen to an ambient screen when a predetermined time elapses after a lock is released;

causing the touch screen to change the ambient screen to a standby screen comprising information provided by a content provider when a tilting movement of the wearable device is detected;

performing user authentication using the heartbeat signal; and

causing the touch screen to display detailed content related to the information provided by the content provider when the user authentication is successful.

8. The wearable device of claim 1 , wherein the function corresponding to the wrist-wearing state comprises causing the touch screen to:

display a black screen; and

change the black screen to either an ambient screen in a lock-released state or a standby screen based on a previous occurrence of a one-time lock-release event,

wherein the black screen is changed in response to a double tap input.

9. The wearable device of claim 1 , wherein:

the optical sensor is further configured to generate a heartbeat signal; and

the function corresponding to the wrist-wearing state comprises:

causing the touch screen to display a black screen;

performing user authentication using the heartbeat signal; and

causing the touch screen to change the black screen to either an ambient screen in a lock-released state or a standby screen based on whether the user authentication is successful and a previous occurrence of a lock-release event.

10. The wearable device of claim 1 , wherein the function corresponding to the non-wearing state comprises causing the touch screen to:

display a black screen; and

change the black screen to a standby screen in response to a knock code or a lock pattern input.

11. The wearable device of claim 1 , wherein the function corresponding to the wrist-wearing state comprises:

causing the touch screen to display a black screen; and

executing a predetermined application in response to a drag touch along a specific portion of the black screen.

12. The wearable device of claim 1 , wherein the control unit is further configured to:

cause the touch screen to display at least one connectivity type when the wearing state is changed from the wrist-wearing state to the not-wearing state; and

deactivate a selected one of the at least one connectivity type in response to a selection input to the displayed selected one connectivity type.

13. The wearable device of claim 12 , wherein the displayed at least one connectivity type comprises at least Wi-Fi, Bluetooth, or NFC.

14. The wearable device of claim 1 , wherein the function corresponding to the wrist-wearing state comprises causing the touch screen to:

display a standby screen in a lock-released state in response to a lock release operation;

change the standby screen to an ambient screen in a lock-released state when a predetermined time elapses; and

change the ambient screen back to the standby screen in the lock-released state in response to a double tap input to the displayed ambient screen;

wherein the ambient screen is displayed with a lower brightness than the standby screen.

15. The wearable device of claim 1 , wherein the optical sensor comprises a heartbeat sensor.

16. A control method of a wearable device, the method comprising:

determining a wearing state of the wearable device based on an acceleration signal or a touch interrupt signal, the wearing state comprising a not-wearing state, a wrist-wearing state, or a hand-gripping state; and

executing a function corresponding to the determined wearing state,

wherein the executing the function comprises

displaying a first screen representing that the touch screen is turned off if the wearable device is in the not-wearing state,

displaying a second screen representing a watch screen if the wearable device is in the wrist wearing state, and

displaying a third screen including notification information if the wearable device is in the hand gripping state,

wherein each of the first screen, the second screen and the third screen is a lock screen or a lock release screen,

the lock screen is a screen for limiting an access of an application in the wearable device, and

the lock release screen is a screen for allowing the access of the application in the wearable device.

17. The method of claim 16 , wherein the function corresponding to the wrist-wearing state comprises:

displaying a standby screen;

receiving a heartbeat signal;

changing the standby screen to an ambient screen when a predetermined time elapses after a lock is released;

changing the ambient screen to a standby screen comprising information provided by a content provider when a tilting movement of the wearable device is detected;

performing user authentication using the heartbeat signal; and

displaying detailed content related to the information provided by the content provider when the user authentication is successful.

18. The method of claim 16 , wherein the function corresponding to the wrist-wearing state comprises:

displaying the black screen;

receiving a heartbeat signal;

performing user authentication using the heartbeat signal; and

changing the black screen to either a lock-released ambient screen or a standby screen based on whether the user authentication is successful and a previous occurrence of a lock-release event.

19. The method of claim 16 , wherein the function corresponding to the wrist-wearing state comprises:

displaying a standby screen in a lock-released state in response to a lock release operation;

changing the standby screen to the ambient screen in a lock-released state when a predetermined time elapses; and

changing the ambient screen back to the standby screen in the lock-released state in response to a double tap input to the displayed ambient screen;

wherein the ambient screen is displayed with a lower brightness than the standby screen.