Electronic device including key assembly and operation method thereof

1. An electronic device comprising:

a housing comprising a first plate facing in a first direction and a second plate facing in a second direction opposite to the first direction; and

a key assembly disposed on at least part of the first plate and comprising a plurality of keys for inputting data by a pressing operation, wherein the key assembly comprises:

a keycap;

a printed circuit board;

a support structure disposed on the printed circuit board to support the keycap and supporting a pressing operation of the keycap;

a contact point portion disposed between a portion of the support structure and the printed circuit board;

a movable portion coupled to the support structure in the second direction; and

an actuator coupled to the movable portion and providing a force for moving the keycap in the first direction or the second direction depending on whether the actuator is activated,

wherein the actuator comprises an elastic material, and is elastically deformed depending on the activation.

2. The electronic device of claim 1 , wherein the actuator is elastically deformed convexly in the first direction or elastically deformed convexly in the second direction.

3. The electronic device of claim 2 , wherein the actuator provides a force which moves the keycap downward in the second direction and then maintains a state of being moved downward.

4. The electronic device of claim 1 , wherein the actuator comprises a piezoelectric ceramic material.

5. The electronic device of claim 1 , wherein the support structure comprises:

a support member coupled to the keycap and constraining the keycap to the printed circuit board in a vertically movable manner;

a restoring member disposed between the printed circuit board and the keycap to restore the pressed keycap in the first direction; and

at least one plunger disposed between the printed circuit board and the keycap to support a vertical movement of the keycap.

6. The electronic device of claim 5 , wherein the restoring member comprises a dome portion of a rubber material.

7. The electronic device of claim 1 , wherein the movable portion comprises a piston structure.

8. An electronic device comprising:

a housing comprising a first plate facing in a first direction and a second plate facing in a second direction opposite to the first direction; and

a key assembly disposed on at least part of the first plate and comprising a plurality of keys for inputting data by a pressing operation, wherein the key assembly comprises:

a keycap;

a printed circuit board;

a support structure which supports the keycap;

a restoring member disposed between the keycap and the printed circuit board to restore the pressed keycap to an original position;

a connection rod coupled to the support structure in the second direction; and

an actuator coupled to the connection rod and deformed depending on whether it is activated to provide a force for moving the connection rod in the first direction or the second direction,

wherein the connection rod moves upward in the first direction by an operation of the actuator, and thus the keycap is prevented from moving downward to disable an input operation of the keycap.

9. The electronic device of claim 8 , wherein the actuator is elastically deformed convexly in the first direction or elastically deformed convexly in the second direction.

10. The electronic device of claim 8 , wherein the restoring member further comprises an opening for inserting the connection rod.

11. The electronic device of claim 8 , wherein the actuator provides a force which moves the keycap upward in the first direction and then maintains a state of being moved upward.

12. The electronic device of claim 8 , wherein the actuator comprises a piezoelectric ceramic material.