Home appliance having a main processor to control power to a sub-processor based on a door state, and controlling method thereof

1. A home appliance comprising:

a door;

a door sensor configured to sense whether the door is opened or closed;

a display;

a main processor;

a sub-processor configured to control a display operation of the display; and

a power controller configured to switch a supply of electrical power to the sub-processor between an on state and an off state to thereby switch the display operation of the display between an on state and an off state,

wherein the main processor is configured to:

receive a signal from the door sensor indicating whether the door is opened or closed,

generate a first control signal for the power controller to turn on the supply of the electrical power to the sub-processor based on the signal received from the door sensor indicating a door opening operation,

generate a second control signal for the power controller to turn off the electrical power to the sub-processor based on the signal received from the door sensor indicating a door closing operation; and

control the power controller to switch the supply of electrical power to the sub-processor according to the first control signal and the second control signal.

2. The home appliance as claimed in claim 1 , further comprising a power supply,

wherein the power controller is a switching element disposed between the power supply and the sub-processor,

the main processor is configured to turn on the supply of the electrical power to the sub-processor by turning on the switching element according to the first control signal, and

the main processor is configured to turn off the supply of the electrical power to the sub-processor by turning off the switching element according to the second control signal.

3. The home appliance as claimed in claim 1 , further comprising a power supply,

the power controller is a chip module disposed between the power supply and the sub-processor,

the main processor is configured to turn on the supply of the electrical power to the sub-processor by transmitting the first control signal to the chip module, and

the main processor is configured to turn off the supply of electrical power to the sub-processor by transmitting the second control signal to the chip module.

4. The home appliance as claimed in claim 1 , wherein the sub-processor turns off power of the display based on the second control signal.

5. The home appliance as claimed in claim 1 , wherein the display is an internal display provided inside the home appliance.

6. The home appliance as claimed in claim 1 , further comprising a motion sensor,

wherein the display is an external display provided outside the home appliance, and

the main processor is further configured to generate the first control signal to turn on the supply of the electrical power to the sub-processor based on an approach of a user sensed by the motion sensor in a state in which the electrical power to the sub-processor is turned off.

7. The home appliance as claimed in claim 1 , further comprising an interface,

wherein the sub-processor is further configured to control the display operation of the display based on a user manipulation command input by the interface.

8. The home appliance as claimed in claim 1 , wherein

the main processor is further configured to control the sub-processor so as to lower a power supply to the sub-processor or to completely power off the sub-processor, during a predetermined time interval which is set by a user or set through artificial learning, and

the predetermined time interval corresponds to a time interval during a day in which the home appliance is determined to not be used by the user.

9. The home appliance as claimed in claim 1 , wherein

the main processor is further configured to control the sub-processor so as to immediately lower a power supply to the sub-processor or immediately completely power off the sub-processor, in response to a door closing operation sensed by the door sensor at a time which is within predetermined time interval of a day, and

the predetermined time interval corresponds to a time interval during the day in which the home appliance is determined to not be used by the user.

10. The home appliance as claimed in claim 1 , wherein the home appliance is implemented as a refrigerator, and

the sub-processor is further configured to control the display to display temperature information of the refrigerator.

11. A controlling method of a home appliance including a main processor and a sub-processor, the controlling method comprising:

sensing whether a door included in the home appliance is opened or closed using a door sensor of the home appliance, as sensing information;

generating, by the main processor, a first control signal for turning on electrical power to the sub-processor based on the sensing information received from the door sensor indicating a door opening operation;

generating, by the main processor, a second control signal for turning off the electrical power to the sub-processor based on the sensing information received from the door sensor indicating a door closing operation;

turning on the electrical power of the sub-processor by controlling a power controller of the home appliance according to the first control signal to thereby turn on a display operation of a display; and

turning off the electrical power of the sub-processor by controlling the power controller of the home appliance according to the second control signal to thereby turn off the display operation of the display.

12. The controlling method as claimed in claim 11 , wherein the power controller is a switching element disposed between a power supply and the sub-processor,

turning on the electrical power to the sub-processor includes turning on the switching element based on the first control signal, and

turning off the electrical power to the sub-processor includes turning off the switching element based on the second control signal.

13. The controlling method as claimed in claim 11 , wherein the power controller is a chip module disposed between a power supply and the sub-processor, and

turning on of the electrical power to the sub-processor includes transmitting the first control signal to the chip module, and

turning off the electrical power to the sub-processor includes transmitting the second control signal to the chip module.

14. The controlling method as claimed in claim 11 , further comprising turning off, by the sub-processor, electrical power of the display based on the second control signal.

15. The controlling method as claimed in claim 11 , wherein the display is an internal display provided inside the home appliance.

16. The controlling method as claimed in claim 11 , wherein the display is an external display provided outside the home appliance, and

generating, by the main processor, the first control signal for turning on the electrical power to the sub-processor is further based on an approach of a user sensed by a motion sensor in a state in which the electrical power to the sub-processor is turned off.

17. The controlling method as claimed in claim 11 , further comprising controlling, by the sub-processor, the display operation of the display based on a user manipulation command input by an interface.

18. The controlling method as claimed in claim 11 , further comprising controlling the sub-processor so as to lower a power supply to the sub-processor or completely power off the sub-processor, during a predetermined time interval which is set by a user or set through artificial learning,

wherein the predetermined time interval corresponds to a time interval during a day in which the home appliance is determined to not be used by the user.

19. The controlling method as claimed in claim 11 , further comprising controlling the sub-processor so as to immediately lower a power supply to the sub-processor or immediately completely power off the sub-processor, in response to a door closing operation sensed by the door sensor at a time which is within a predetermined time interval of a day,

wherein the predetermined time interval corresponds to a time interval during the day in which the home appliance is determined to not be used by the user.

20. The controlling method as claimed in claim 11 , wherein the home appliance is implemented as a refrigerator, and

the controlling method further includes controlling, by the sub-processor, the display to display temperature information of the refrigerator.