Devices and methods for transmitting and receiving data of a sink device to change video display resolution based on error counter value detected at the sink device using HDMI

1. A method for transmitting and receiving data of a sink device by using a High Definition Multimedia Interface (HDMI), the method comprising:

receiving, from a source device, video data through at least one channel of the HDMI;

counting an error counter value regarding the at least one channel of the HDMI by performing Character Error Detection (CED) on the received video data;

when the error counter value is larger than a pre-configured threshold value, transmitting, to the source device, a Consumer Electronics Control (CEC) message requesting to change resolution of the received video data; and

receiving, from the source device, another video data with changed resolution according to the CEC message.

2. The method of claim 1 , further comprising:

mapping the error counter value to Status and Control Data Channel (SCDC) data.

3. The method of claim 1 , wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the received video data.

4. The method of claim 3 , further comprising:

storing VIC information indicating the changed resolution of the another video data,

wherein the changed resolution is configured as a default resolution for the source device.

5. The method of claim 3 , further comprising:

when the error counter value is larger than the pre-configured threshold value, outputting a User Interface (UI) including a message suggesting replacement of an HDMI cable or downgrading video resolution.

6. A sink device transmitting and receiving data by using a High Definition Multimedia Interface (HDMI), the sink device comprising:

a HDMI receiver transmitting and receiving audio/video data through the HDMI; and

a controller controlling data transmission and reception of the HDMI receiver, wherein the sink device is configured to:

receive, from a source device, video data through at least one channel of the HDMI;

count an error counter value regarding the at least one channel of the HDMI by performing Character Error Detection (CED) on the received video data;

when the error counter value is larger than a pre-configured threshold value, transmit, to the source device, a Consumer Electronics Control (CEC) message requesting to change resolution of the received video data; and

receive, from the source device, another video data with changed resolution according to the CEC message.

7. The sink device of claim 6 , wherein the sink device is configured to map the error counter value to Status and Control Data Channel (SCDC) data.

8. The sink device of claim 6 , wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the received video data.

9. The sink device of claim 8 , wherein the sink device is configured to store VIC information indicating the changed resolution of the another video data, and

wherein the changed resolution is configured as a default resolution for the source device.

10. The sink device of claim 8 , wherein, when the error counter value is larger than the pre-configured threshold value, the sink device is configured to output a User Interface (UI) including a message suggesting replacement of an HDMI cable or downgrading video resolution.

11. A method for transmitting and receiving data of a source device by using a High Definition Multimedia Interface (HDMI), the method comprising:

obtaining video resolution information indicating video resolution supported by a sink device, by reading Extended Display Identification Data (EDID) of the sink device;

transmitting, to the sink device, video data based on the obtained video resolution information;

receiving, from the sink device, a Consumer Electronics Control (CEC) message requesting to change resolution of the transmitted video data; and

transmitting, to the sink device, another video data with changed resolution according to the CEC message.

12. The method of claim 11 ,

wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the transmitted video data.

13. The method of claim 12 , wherein the changed resolution of the another video data is a downgraded resolution.

14. The method of claim 11 , further comprising:

reading a Character Error Detection (CED) error counter value corresponding to the transmitted video data from Status and Control Data Channel (SCDC) data of the sink device.

15. A source device transmitting and receiving data by using a HDMI, the source device comprising:

an HDMI transmitter transmitting and receiving data through the HDMI; and

a controller controlling data transmission and reception of the HDMI transmitter, wherein the source device is configured to:

obtain video resolution information indicating video resolution supported by a sink device, by reading Extended Display Identification Data (EDID) of the sink device;

transmit, to the sink device, video data based on the video resolution information;

receive, from the sink device, a Consumer Electronics Control (CEC) message requesting to change resolution of the transmitted video data; and

transmit, to the sink device, another video data with changed resolution according to the CEC message.

16. The source device of claim 15 ,

wherein the CEC message includes Video Identification Code (VIC) information indicating specific resolution to be changed for the transmitted video data.

17. The source device of claim 16 , wherein the changed resolution of the another video data is a downgraded resolution.

18. The source device of claim 15 , the source device is configured to read a Character Error Detection (CED) error counter value corresponding to the transmitted video data from Status and Control Data Channel (SCDC) data of the sink device.