Display device and control method thereof

A display device comprising:

• a communication module configured to communicate externally;
• a display having a display area for outputting content;
• a motor configured to control the display to expose a portion of the display area externally;
• and
• a controller configured to:
• control the communication module, the display, and the motor,
• wherein the controller is configured to:
• control the display to output first content on a first partial view based on that a state of the display is the first partial view;
• change the state of the display to a second partial view based on receiving an event occurrence;
• and
• control the display to output second content on the second partial view, and
• wherein the second partial view has a larger display area exposed externally than the first partial view,
• wherein the first content is default content, and
• wherein the event occurrence is an emergency alarm.

A method of controlling a display device configured to change a size of a display area exposed externally, the method comprising:

• outputting first content on a first partial view based on that a state of a display is the first partial view;
• changing the state of the display to a second partial view based on receiving an event occurrence;
• outputting second content on the second partial view,
• wherein the second partial view has a larger display area exposed externally than the first partial view,
• establishing a connection with an external terminal through a communication module;
• and
• changing the state of the display to one of the first partial view or the second partial view based on information received from the external terminal.