Image display device

1 . 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.

2 . The image display device of claim 1 , wherein the controller is configured to:

based on receiving a second input while the predetermined screen is displayed, output a user interface (UI) including at least one object associated with the screen mode on the predetermined screen; and

based on selection of one of the at least one object, determine at least one of the screen mode and the arrangement of the plurality of screens.

3 . The image display device of claim 1 , further comprising a memory configured to store a connection history of the external device,

wherein the controller is configured to:

in case that a connection history corresponding to the external display is stored in the memory, set, upon connecting with the external display, the screen mode according to the connection history corresponding to the external display; and

in case that the connection history corresponding to the external display is not stored in the memory, set a preset mode as the screen mode upon connecting with the external display.

4 . The image display device of claim 1 , wherein the screen mode further includes

a basic mode to output a same screen through the display and the external display.

5 . The image display device of claim 4 , wherein, in case that a pointer displayed on the predetermined screen is located in a predetermined area, the controller is configured to output an object corresponding to a position of the pointer on the predetermined screen.

6 . The image display device of claim 5 , wherein the controller is configured to:

based on the pointer being located in an area corresponding to a second direction among a plurality of directions, output a specific object indicating the second direction on the predetermined screen;

based on selection of the specific object, set the screen mode to the extended mode; and

determine the arrangement of the plurality of screens so that the second screen corresponding to the external display is positioned in the second direction with respect to the first screen corresponding to the display.

7 . The image display device of claim 6 , wherein:

based on the arrangement of the plurality of screens not being preset that the second screen is positioned in the second direction with respect to the first screen, the specific object is displayed in a first state, which is selectable; and

based on the arrangement of the plurality of screens being preset that the second screen is positioned in the second direction with respect to the first screen, the specific object is displayed in a second state, which is not selectable.

8 . The image display device of claim 5 , wherein the controller is configured to:

based on the pointer being located in an area corresponding to a setting of the screen mode, output an object corresponding to the basic mode; and

based on selection of the object corresponding to the basic mode, set the screen mode to the basic mode.

9 . The image display device of claim 8 , wherein:

when the screen mode is preset to the extended mode, the object corresponding to the basic mode is displayed in a first state, which is selectable; and

when the screen mode is preset to the basic mode, the object corresponding to the basic mode is displayed in a second state, which is not selectable.

10 . The image display device of claim 1 , wherein the controller is configured to:

maintain the screen mode based on a second external display being additionally connected while being connected with the first external display; and

based on the screen mode being the extended mode, determine a position of a third screen corresponding to the second external display according to arrangement of the first screen corresponding to the display and the second screen corresponding to the first external display.

11 . The image display device of claim 10 , wherein, in case that the second screen is preset to be positioned in the first direction with respect to the first screen, the controller is configured to determine the arrangement of the plurality of screens so that the third screen is positioned in the first direction with respect to the second screen.

12 . The image display device of claim 10 , wherein, while the screen mode is the extended mode, the controller is configured to:

based on a pointer corresponding to the user input being located on the first screen, output a plurality of objects respectively indicating a plurality of directions on the first screen; and

based on the pointer being located on the second screen, output the plurality of objects on the second screen.

13 . The image display device of claim 12 , wherein, based on an input for selecting one of the plurality of objects, the controller is configured to update the arrangement of the plurality of screens according to a direction corresponding to the selected object.

14 . The image display device of claim 1 , wherein the controller is configured to:

in response to receiving the first input, output a user interface (UI) including a specific object indicating the first direction on the predetermined screen; and

based on selection of the specific object, set the screen mode to the extended mode and determine the arrangement of the plurality of screens so that the second screen is positioned in the first direction with respect to the first screen.