IP Library › Granted Patent US 12689789
Granted Patent B2
US 12689789 · App. 18/677,732 · Granted Jul 21, 2026

Image display apparatus

Inventors: Sanghyun Han (Seoul, KR); Cheolhwa Yoo (Seoul, KR)
Assignee: LG ELECTRONICS INC.
H04N21/4307
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Quick Facts
Patent No.
US 12689789
App. No.
18/677,732
Filed
May 29, 2024
Granted
Jul 21, 2026
Kind
B2
Examiner
LEE, MICHAEL
Art Unit
2422
USPC
348/515
Abstract

The image display apparatus of the present disclosure comprises: a display; an audio output device; and a signal processing device, in a simultaneous sound output mode, configured to output a first audio signal based on a first additional delay time to the audio output device and to output a second audio signal based on a second additional delay time, which is lower in level than the first additional delay time, to the sound output device, and in a single sound output mode of the audio output device, configured to output a third audio signal to the audio output device, wherein the first additional delay time is greater than or equal to an additional delay time of a third sound. Accordingly, sound synchronization may be performed in case in which the sound output device and the image display apparatus simultaneously output sound.

Claims (48)

1 . An image display apparatus comprising:

a display;

an audio output device configured to output sound;

an interface configured to receive a plurality of audio format information of an external sound output device from the sound output device after the sound output device is turned on; and

a signal processing device configured to:

receive the plurality of audio format information through the interface,

in response to a simultaneous sound output mode of the sound output device and the audio output device, and an audio format of the sound output device corresponding to a first audio format information among the plurality of audio format information, calculate a first additional delay time based on a first audio processing time information of the sound output device corresponding to the first audio format information, output a first audio signal based on the first additional delay time to the audio output device and output a second audio signal based on a second additional delay time, which is less than the first additional delay time, to the sound output device, and

in response to a single sound output mode of the audio output device, output a third audio signal to the audio output device,

wherein the signal processing device is configured to control the first additional delay time based on the first audio signal output from the audio output device to be greater than or equal to a third additional delay time based on the third audio signal output from the audio output device,

wherein in response to the simultaneous sound output mode, the audio format of the sound output device corresponding to a second audio format information among the plurality of audio format information, and a second audio processing time corresponding to the second audio format in the sound output device being greater than the first audio processing time corresponding to the first audio format in the sound output device, the signal processing device is configured to control the second additional delay time corresponding to the second audio format in the sound output device to be less than the second additional delay time corresponding to the first audio format in the sound output device.

2 . The image display apparatus of claim 1 , wherein the interface is configured to receive the plurality of audio format information and a plurality of audio processing time information corresponding to the plurality of audio format information from the sound output device,

wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on the plurality of audio format information and the plurality of audio processing time information.

3 . The image display apparatus of claim 1 , wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on video processing time information of an input video signal, the audio format information, and the audio processing time information of the sound output device corresponding to the audio format information.

4 . The image display apparatus of claim 3 , wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on the video processing time information of the input video signal, output time information for the sound output device, the audio format information, and the audio processing time information of the sound output device corresponding to the audio format information.

5 . The image display apparatus of claim 4 , wherein as a level of the output time information for the sound output device increases, or a level of audio processing time information of an audio driver decreases, or a level of the audio processing time information of the sound output device increases, the signal processing device is configured to increase the first additional delay time of the first audio signal.

6 . The image display apparatus of claim 1 , wherein after the sound output device is turned on, the interface is configured to receive the plurality of audio format information through a first transmission line,

wherein in the simultaneous sound output mode, the interface is configured to transmit the second audio signal to the sound output device through a second transmission line.

7 . The image display apparatus of claim 1 , wherein in case in which the sound output device is turned off during operation in the simultaneous sound output mode, the signal processing device is configured to switch to the single sound output mode in which the audio output device solely outputs sound.

8 . The image display apparatus of claim 1 , wherein while a broadcast video is displayed on the display, the signal processing device is configured to control the first additional delay time based on the first audio signal output from the audio output device to be greater than or equal to the third additional delay time based on the third audio signal output from the audio output device.

9 . The image display apparatus of claim 1 , wherein the signal processing device is configured to control the first additional delay time based on the first audio signal output from the audio output device while a cinema video is displayed on the display, to be greater than the first additional delay time based on the first audio signal which is output from the audio output device while a broadcast video is displayed on the display.

10 . An image display apparatus comprising:

a display;

an audio output device configured to output sound;

an interface configured to receive a plurality of audio format information of an external sound output device from the sound output device after the sound output device is turned on; and

a signal processing device configured to:

receive the plurality of audio format information through the interface,

in response to a simultaneous sound output mode of the sound output device and the audio output device, and an audio format of the sound output device corresponding to a first audio format information among the plurality of audio format information, calculate a first additional delay time based on the first audio format information, output a first audio signal based on the calculated first additional delay time to the audio output device, and output a second audio signal based on a second additional delay time, which is lower in level than the first additional delay time, to the sound output device,

wherein in response to the simultaneous sound output mode, the audio format of the sound output device corresponding to a second audio format information among the plurality of audio format information, and a second audio processing time corresponding to the second audio format in the sound output device being greater than the first audio processing time corresponding to the first audio format in the sound output device, the signal processing device is configured to control the second additional delay time corresponding to the second audio format in the sound output device to be less than the second additional delay time corresponding to the first audio format in the sound output device.

11 . The image display apparatus of claim 10 , wherein the interface is configured to receive the plurality of audio format information and a plurality of audio processing time information corresponding to the plurality of audio format information from the sound output device,

wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on the audio format information or the audio processing time information.

12 . The image display apparatus of claim 10 , wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on video processing time information of an input video signal, the plurality of audio format information, and the audio processing time information of the sound output device corresponding to the plurality of audio format information.

13 . The image display apparatus of claim 12 , wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on the video processing time information of the input video signal, output time information for the sound output device, the audio format information, and the audio processing time information of the sound output device corresponding to the audio format information.

14 . The image display apparatus of claim 13 , wherein as a level of the output time information for the sound output device increases, or a level of audio processing time information of an audio driver decreases, or a level of the audio processing time information of the sound output device increases, the signal processing device is configured to increase the first additional delay time of the first audio signal.

15 . An image display apparatus comprising:

a display;

an audio output device configured to output sound;

an interface configured to receive a plurality of audio format information of an external sound output device from the sound output device after the sound output device is turned on; and

a signal processing device configured to:

receive the plurality of audio format information through the interface,

in response to a simultaneous sound output mode of the sound output device and the audio output device, and an audio format of the sound output device corresponding to a first audio format information among the plurality of audio format information, calculate a first additional delay time based on a first audio processing time information of the sound output device corresponding to the first audio format information, output a first audio signal based on the first additional delay time to the audio output device and output a second audio signal based on a second additional delay time, which is lower in level than the first additional delay time, to the sound output device,

wherein the interface is configured to:

after the sound output device is turned on, receive the plurality of audio format information through a first transmission line; and

in the simultaneous sound output mode, transmit the second audio signal to the sound output device through a second transmission line,

wherein in response to the simultaneous sound output mode, the audio format of the sound output device corresponding to a second audio format information among the plurality of audio format information, and a second audio processing time corresponding to the second audio format in the sound output device being greater than the first audio processing time corresponding to the first audio format in the sound output device, the signal processing device is configured to control the second additional delay time corresponding to the second audio format in the sound output device to be less than the second additional delay time corresponding to the first audio format in the sound output device.

16 . The image display apparatus of claim 15 , wherein the interface is configured to receive the audio format information or the audio processing time information from the sound output device,

wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on the plurality of audio format information and a plurality of audio processing time information corresponding to the plurality of audio format information.

17 . The image display apparatus of claim 15 , wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on video processing time information of an input video signal, the audio format information, and the audio processing time information of the sound output device corresponding to the audio format information.

18 . The image display apparatus of claim 17 , wherein in the simultaneous sound output mode, the signal processing device is configured to calculate the first additional delay time of the first audio signal based on the video processing time information of the input video signal, output time information for the sound output device, the audio format information, and the audio processing time information of the sound output device corresponding to the audio format information.