Display apparatus, and method and system for controlling the same

1. A display apparatus comprising:

a display;

an interface;

a storage; and

a processor configured to:

transmit information on a refresh rate of the display, stored in the storage, to a source apparatus connected to the interface;

based on an image signal received from the source apparatus being displayed as an image on the display at a preset first refresh rate for more than a predetermined period, switch the refresh rate, stored in the storage, to a second refresh rate that is lower than the first refresh rate;

transmit information about the second refresh rate to the source apparatus; and

display an image on the display at the second refresh rate of the image signal received from the source apparatus,

wherein the processor is further configured to identify the refresh rate of the displayed image based on timing information of a vertical sync signal included in the received image signal.

2. The display apparatus according to claim 1 , wherein the refresh rate of the received image signal varies within a range corresponding to the first refresh rate.

3. The display apparatus according to claim 2 , further comprising an image processor configured to synchronize the refresh rate of the image displayed on the display with the varying refresh rate of the received image signal.

4. The display apparatus according to claim 1 , wherein

the storage is further configured to store information about the first refresh rate corresponding to a first mode, and information about the second refresh rate corresponding to a second mode, and

the processor is further configured to switch the stored refresh rate to at least one of the first mode and the second mode.

5. The display apparatus according to claim 4 , wherein the processor is further configured to transmit information about one of the first refresh rate and the second refresh rate to the source apparatus through the interface.

6. The display apparatus according to claim 4 , further comprising a user input receiver configured to receive a selection of at least one of the first mode and the second mode.

7. The display apparatus according to claim 1 , wherein

the processor is configured to, based on the image being displayed at the second refresh rate for more than a predetermined time, switch the refresh rate stored in the storage to the first refresh rate, and

transmit the information about the first refresh rate to the source apparatus through the interface.

8. A method of controlling a display apparatus, comprising:

transmitting information about a refresh rate of a display, stored in a storage, to a source apparatus connected through an interface;

displaying an image on the display based on an image signal received from the source apparatus;

based on the image being displayed at a preset first refresh rate for more than a predetermined period, switching the refresh rate, stored in the storage, to a second refresh rate that is lower than the first refresh rate;

transmitting information about the second refresh rate to the source apparatus;

displaying an image on the display at the second refresh rate of the image signal received from the source apparatus; and

identifying the refresh rate of the displayed image based on timing information of a vertical sync signal included in the received image signal.

9. The method according to claim 8 , wherein the refresh rate of the received image signal varies within a range corresponding to the first refresh rate.

10. The method according to claim 9 , further comprising synchronizing the refresh rate of the image displayed on the display with the varying refresh rate of the received image signal.

11. The method according to claim 8 , wherein

the storage is configured to store information about the first refresh rate corresponding to a first mode, and information about the second refresh rate corresponding to a second mode, and

the method further comprises switching the stored refresh rate to at least one of the first mode and the second mode.

12. The method according to claim 11 , further comprising transmitting information about one of the first refresh rate and the second refresh rate to the source apparatus through the interface.

13. The method according to claim 11 , further comprising receiving a selection of at least one of the first mode and the second mode.

14. The method according to claim 8 , further comprising:

based on the image being displayed at the second refresh rate for more than a predetermined time period, switching the refresh rate, stored in the storage, to the first refresh rate; and

transmitting the information about the first refresh rate to the source apparatus through the interface.

15. A system with a source apparatus and a display apparatus,

the source apparatus comprising:

a graphic processor configured to output an image signal; and

a first interface configured to connect with the display apparatus and transmit the image signal to the display apparatus,

the display apparatus comprising:

a display;

a second interface configured to connect with the source apparatus and receive the image signal;

a storage; and

a processor is configured to:

based on the received image signal displayed as an image on the display at a preset first refresh rate for more than a predetermined period, switch the refresh rate, stored in the storage, to a second refresh rate that is lower than the first refresh rate;

transmit information about the second refresh rate to the source apparatus, and

wherein the graphic processor is configured to output an image signal corresponding to the second refresh rate, and

wherein the processor is configured to identify the refresh rate of the displayed image based on timing information of a vertical sync signal included in the received image signal.

16. The system according to claim 15 , wherein the processor is configured to:

receive the image signal corresponding to the second refresh rate from the source apparatus through the interface; and

display an image on the display at the second refresh rate based on the received image signal.

17. The system according to claim 15 , wherein the refresh rate of the received image signal varies within a range corresponding to the first refresh rate, and

the display apparatus further comprises an image processor configured to synchronize the refresh rate of the image displayed on the display with the varying refresh rate of the received image signal.