Display device

1. A display device comprising:

a housing;

a rotatable roller accommodated in the housing;

a rollable display adjusted in a drawn-out length from the housing according to rotation of the roller; and

a controller configured to:

receive an input of a voice command, and

vary a method of outputting a result of the voice command according to the drawn-out length of the rollable display,

wherein the controller configured to output the result of the voice command differently according to the drawn-out length of the rollable display even for the same voice command.

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

output the result of the voice command as audio when the rollable display is not drawn out from the housing, and

display the result of the voice command on the rollable display when at least a part of the rollable display is drawn out from the housing.

3. The display device of claim 2 , wherein the controller is configured to differently adjust an amount of the result of the voice command output on the rollable display according to the drawn-out length of the rollable display when at least a part of the rollable display is drawn out from the housing.

4. The display device of claim 3 , wherein the controller is configured to:

display the result of the voice command on the rollable display when the drawn-out length is equal to or greater than a preset length, and

display summary information of the result of the voice command on the rollable display when the drawn-out length is less than the preset length.

5. The display device of claim 1 , wherein the controller is configured to receive a selection whether to display the result of the voice command to a screen on the rollable display after outputting the result of the voice command as audio, when the rollable display is not drawn out from the housing.

6. The display device of claim 5 , wherein the controller is configured to control the roller such that the rollable display is drawn out from the housing, when a command for displaying the result of the voice command to the screen is received.

7. The display device of claim 1 , wherein the controller is configured to control the roller such that the rollable display is drawn out from the housing, while outputting the result of the voice command as audio, when the rollable display is not drawn out from the housing.

8. The display device of claim 1 , wherein the controller is configured to control the roller such that the rollable display is further drawn out from the housing, while displaying summary information of the result of the voice command on the rollable display, when the drawn-out length is less than a preset length.

9. The display device of claim 8 , wherein the controller is further configured to display information other than the summary information on the rollable display, while the rollable display is being further drawn out.

10. The display device of claim 1 , wherein the controller is configured to adjust the drawn-out length of the rollable display according to the result of the voice command.

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

control the roller such that the rollable display is at least partially drawn out from the housing when an image is included in the result of the voice command, and

control the roller such that the rollable display is entirely drawn into the housing when an image is not included in the result of the voice command.

12. The display device of claim 1 , wherein the controller is configured to adjust the drawn-out length of the rollable display according to a size of the voice command.

13. The display device of claim 12 , wherein the controller is configured to:

control the roller such that the rollable display is at least partially drawn out from the housing when the size of the voice command is equal to or greater than a preset size, and

control the roller such that the rollable display is entirely drawn into the housing when the size of the voice command is less than the preset size.

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

detect an external device connected to the display device when the voice command is a search command for the external device,

control the roller such that the rollable display is entirely drawn into the housing when the external device is not detected, and

control the roller such that the rollable display is at least partially drawn out from the housing when the external device is detected.

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

connect to an external device when the voice command is a connection command for the external device,

output information on the connection to the external device as audio when the rollable display is entirely drawn into the housing, and

display information on the connection to the external device on the rollable display when at least a part of the rollable display is drawn out from the housing.

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

set one search domain for the voice command when at least a part of the rollable display is drawn out from the housing, and

set two or more search domains for the voice command when the rollable display is entirely drawn out from the housing.

17. The display device of claim 1 , wherein the controller is configured to differently control the drawn-out length of the rollable display for providing the result of the voice command according to a question format of the voice command.

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

differently control the result of the voice command according to a mode of the rollable display when the voice command is received, and

wherein the mode of the rollable display comprises a zero view mode in which the rollable display operates in a state of being entirely drawn in the housing, a full view mode in which the rollable display operates in a state of being maximally drawn out from the housing, and a partial view mode in which the rollable display operates in a state of being drawn out from the housing to be shorter than in the full view mode.

19. The display device of claim 18 , wherein the controller is configured to:

output, as audio, a search result corresponding to the voice command when the rollable display is in the zero view mode,

display the search result corresponding to the voice command on the rollable display when the rollable display is in the full view mode, and

display summary information of the search result corresponding to the voice command on the rollable display when the rollable display is in the partial view mode.

20. The display device of claim 1 , wherein the controller is configured to differently control the method of providing the result of the voice command according to the drawn-out length by outputting audio data or by displaying the result on the rollable display.