Display apparatus and sound outputting method thereof

1. A display apparatus comprising:

a display panel configured to display an image in a front direction;

a main speaker provided on a rear surface of the display panel;

an auxiliary speaker provided on the rear surface of the display panel, the auxiliary speaker being configured to output a sound in a rear direction opposing the front direction; and

a processor configured to:

identify an amount of channels in an input audio signal;

filter the input audio signal based on the amount of channels in the input audio signal;

based on the audio signal having two channels, control the main speaker to output the audio signal and control the auxiliary speaker to output a filtered version of the audio signal; and

based on the audio signal having three or more channels, control the main speaker to output a front channel of the audio signal and a first filtered version of a surround channel of the audio signal, and control the auxiliary speaker to output a filtered version of the front channel of the audio signal and a second filtered version of the surround channel.

2. The display apparatus of claim 1 , wherein the auxiliary speaker is configured to output the sound in a direction that is inclined by a predetermined angle with respect to the rear surface of the display panel.

3. The display apparatus of claim 1 , wherein the auxiliary speaker comprises:

an upper speaker provided on an upper portion of the rear surface of the display panel; and

a side speaker provided on a side portion of the rear surface of the display panel.

4. The display apparatus of claim 1 , wherein the auxiliary speaker is provided on a corner of an upper portion of the rear surface of the display panel.

5. The display apparatus of claim 1 , further comprising a backside cover covering the auxiliary speaker.

6. The display apparatus of claim 5 , wherein the backside cover comprises an air vent or slit in an area corresponding to a sound outputting area of the auxiliary speaker.

7. The display apparatus of claim 1 , wherein the main speaker comprises:

a first main speaker provided on a side portion of the rear surface of the display panel, the first main speaker being configured to output a sound in a side direction; and

a second main speaker provided on a lower portion of the rear surface of the display panel, the second main speaker being configured to output a sound in a lower direction.

8. The display apparatus of claim 7 , wherein the first main speaker comprises at least one of a tweeter or a mid-range speaker, and the second main speaker comprises a woofer.

9. The display apparatus of claim 1 , wherein the processor is configured to, based on a two-channel audio signal being input, control the main speaker to output the input two-channel audio signal, and control the auxiliary speaker to output the input two-channel audio signal on which signal processing has been performed.

10. The display apparatus of claim 9 , wherein the signal processing performed on the input two-channel audio signal comprises bandwidth reinforcing processing within a predetermined frequency range.

11. A sound outputting method of a display apparatus comprising a display panel having a front surface facing a front direction and a rear surface facing a rear direction opposite to the front direction, a main speaker provided on the rear surface of the display panel, and an auxiliary speaker provided on the rear surface of the display panel, the method comprising:

receiving an input audio signal;

identifying an amount of channels in the input audio signal;

filtering the audio signal based on the amount of channels in the input audio signal;

based on the audio signal having two channels, outputting the audio signal through the main speaker provided on the rear surface of the display panel and outputting a filtered version of the audio signal through the auxiliary speaker provided on the rear surface of the display panel; and

based on the audio signal having three or more channels, outputting a front channel of the audio signal and a first filtered version of a surround channel of the audio signal through the main speaker provided on the rear surface of the display panel, and outputting a filtered version of the front channel of the audio signal and a second filtered version of the surround channel through the auxiliary speaker provided on the rear surface of the display panel.

12. The sound outputting method of claim 11 , wherein the outputting the filtered version of the audio signal through the auxiliary speaker comprises, based on the audio signal having the two channels, outputting the audio signal having the two channels on which signal processing has been performed by the auxiliary speaker.

13. The sound outputting method of claim 12 , wherein the signal processing performed on the audio signal having the two channels comprises bandwidth reinforcing processing within a predetermined frequency range.

14. A sound outputting method of a display apparatus comprising a display panel having a front surface facing a front direction and a rear surface facing a rear direction opposite to the front direction, a main speaker provided on the rear surface of the display panel, and an auxiliary speaker provided on the rear surface of the display panel, the method comprising:

receiving an input audio signal;

identifying an amount of channels in the input audio signal;

filtering the input audio signal, based on the amount of channels in the input audio signal;

based on the audio signal having two channels, outputting the audio signal through the main speaker provided on the rear surface of the display panel and outputting a filtered version of the audio signal through the auxiliary speaker provided on the rear surface of the display panel;

based on the audio signal having three or more channels, outputting a front channel of the audio signal and a first filtered version of a surround channel of the audio signal through the main speaker provided on the rear surface of the display panel, and outputting a filtered version of the front channel of the audio signal and a second filtered version of the surround channel through the auxiliary speaker provided on the rear surface of the display panel; and

setting, based on a type of the audio signal being a signal having two or less channels, a front channel of the audio signal.

15. The sound outputting method of claim 14 , further comprising:

compiling, based on the type of the input audio signal having three or more channels, the front channel of the input audio signal having three or more channels and a low pass filtered version of the surround channel; and

compiling, based on the type of the input audio signal having three or more channels, a high pass filtered version of the surround channel and a band pass filtered version of the front channel of the input audio signal having three or more channels.