Image display device

An image display device comprising:

• a display;
• an external device interface configured to communicate with an external device;
• a user input interface configured to receive a user input;
• and
• a controller,
• wherein the controller is configured to:
• based on connection with an external display through the external device interface while a predetermined screen is output through the display, monitor whether a predetermined input is received through the user input interface;
• based on receiving the predetermined input while the predetermined screen is displayed, determine at least one of a screen mode for displaying a plurality of screens and arrangement of the plurality of screens;
• and
• transmit, through the external device interface, an image signal corresponding to the screen mode and the arrangement of the plurality of screens to the external display,
• wherein the controller is further configured to:
• based on receiving a first input corresponding to a first direction a predetermined number of times in a row through the user input interface, set the screen mode to an extended mode in which different screens are respectively output through the display and the at least one external display according to the arrangement of the plurality of screens;
• and
• determine the arrangement of the plurality of screens so that a second screen corresponding to a first external display is positioned in the first direction with respect to a first screen corresponding to the display.