Image display apparatus

Abstract

An image display apparatus is provided. An image display device of the present disclosure includes: a display; an audio output device; an interface configured to exchange data with an external sound output device; and a signal processing device configured, in a simultaneous output mode, 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 to the sound output device, the second additional delay time is lower in level than the first additional delay time in a single-sound output mode of the audio output device, and wherein the first additional delay time of the first sound is greater than or equal to the additional delay time of the third sound, and wherein the signal processing device is configured to output a third audio signal to the audio output device in a single-sound output mode of the audio output device. Accordingly, sound synchronization may be performed in a case where the sound output device and the image display apparatus output sound simultaneously.

Description

Technical Field

[0001] The present disclosure relates to an image display apparatus, and more particularly, to an image display apparatus capable of performing sound synchronization when the image display apparatus and a sound output device simultaneously output sounds. Background Art

[0002] An image display device is a device that can display various images.

[0003] When an image is displayed on the image display device, a sound corresponding to the image is output.

[0004] As users demand complete and rich sound, the output power required for image display devices to output sound increases, and separate sound output devices are increasingly used.

[0005] However, when the sound output device and the image display apparatus simultaneously output sound, there is a disadvantage in that a sense of difference is generated between the sound output from the sound output device and the sound output from the image display apparatus, thereby disturbing immersion when the user listens to the sound. Summary of the invention

[0006] An object of the present disclosure is to provide an image display apparatus capable of performing sound synchronization in a case where the image display apparatus and a sound output device simultaneously output sounds.

[0007] Another object of the present disclosure is to provide an image display device capable of outputting sound with less delay in a case where the image display device outputs sound alone.

[0008] In order to achieve the above and other purposes, an image display device according to an embodiment of the present disclosure includes: a display; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; and a signal processing device, which is configured to output a first audio signal based on a first additional delay time to the audio output device in a simultaneous sound output mode of the sound output device and the audio output device, and to output a second audio signal based on a second additional delay time that is lower in level than the first additional delay time to the sound output device, and is configured to output a third audio signal to the audio output device in a mono sound output mode of the audio output device, wherein a first additional delay time of a first sound based on the first audio signal output from the audio output device is greater than or equal to an additional delay time of a third sound based on the third audio signal output from the audio output device.

[0009] Furthermore, in the simultaneous sound output mode, the signal processing device may be configured to calculate a first additional delay time of the first audio signal based on audio format information or audio processing time information of the sound output device.

[0010] In addition, the interface can be configured to receive audio format information or audio processing time information from the sound output device, wherein, in the simultaneous output mode, the signal processing device can be 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.

[0011] Furthermore, in the simultaneous sound output mode, the signal processing device may be configured to calculate a first additional delay time of the first audio signal based on video processing time information of the input video signal and audio format information or audio processing time information of the sound output device.

[0012] In addition, in the simultaneous sound output mode, the signal processing device can be 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, the output time information of the sound output device, and the audio format information or audio processing time information of the sound output device.

[0013] In addition, as the level of the output time information of the sound output device increases, or the level of the audio processing time information of the audio driver decreases, or the level of the audio processing time information of the sound output device increases, the signal processing device can be configured to increase the first additional delay time of the first audio signal.

[0014] In addition, after the sound output device is turned on, the interface can be configured to receive audio format information or audio processing time information of the sound output device through a first transmission line, wherein in the simultaneous sound output mode, the interface can be configured to send a second audio signal to the sound output device through a second transmission line.

[0015] Furthermore, in a case where the sound output device is turned off during operation in the simultaneous sound output mode, the signal processing device may be configured to switch to a single sound output mode in which the audio output device outputs sound alone.

[0016] In addition, when displaying the broadcast video on the display, the signal processing device can be configured to control a first additional delay time of a first sound based on a first audio signal output from the audio output device to be greater than or equal to an additional delay time of a third sound based on a third audio signal output from the audio output device.

[0017] In addition, the signal processing device can be configured to control the first additional delay time of the first sound based on the first audio signal output from the audio output device when displaying a movie video on the display to be greater than the first additional delay time of the first sound based on the first audio signal output from the audio output device when displaying a broadcast video on the display.

[0018] According to another embodiment of the present disclosure, an image display device includes: a display; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; and a signal processing device, wherein in a simultaneous sound output mode of the sound output device and the audio output device, the signal processing device is configured to calculate a first additional delay time based on audio format information or audio processing time information of the sound output device to output a first audio signal based on the calculated first additional delay time to the audio output device, and to output a second audio signal based on a second additional delay time to the sound output device, the second additional delay time being lower in level than the first additional delay time.

[0019] In addition, the interface can be configured to receive audio format information or audio processing time information from the sound output device, wherein, in the simultaneous output mode, the signal processing device can be 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.

[0020] Furthermore, in the simultaneous sound output mode, the signal processing device may be configured to calculate a first additional delay time of the first audio signal based on video processing time information of the input video signal and audio format information or audio processing time information of the sound output device.

[0021] In addition, in the simultaneous sound output mode, the signal processing device can be 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, the output time information of the sound output device, and the audio format information or audio processing time information of the sound output device.

[0022] In addition, as the level of the output time information of the sound output device increases, or the level of the audio processing time information of the audio driver decreases, or the 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.

[0023] According to another embodiment of the present disclosure, an image display device includes: a display; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; and a signal processing device, which is configured to output a first audio signal based on a first additional delay time to the audio output device and output a second audio signal based on a second additional delay time to the sound output device in a simultaneous sound output mode of the sound output device and the audio output device, and the second additional delay time is lower in level than the first additional delay time, wherein the interface is configured to: after the sound output device is turned on, receive audio format information or audio processing time information of the sound output device 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.

[0024] In addition, the interface can be configured to receive audio format information or audio processing time information from the sound output device, wherein, in the simultaneous output mode, the signal processing device can be 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.

[0025] Furthermore, in the simultaneous sound output mode, the signal processing device may be configured to calculate a first additional delay time of the first audio signal based on video processing time information of the input video signal and audio format information or audio processing time information of the sound output device.

[0026] In addition, in the simultaneous sound output mode, the signal processing device can be 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, the output time information of the sound output device, and the audio format information or audio processing time information of the sound output device.

[0027] Technical Effects

[0028] The image display device according to an embodiment of the present disclosure includes: a display; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; and a signal processing device, in a simultaneous sound output mode of the sound output device and the audio output device, configured to output a first audio signal based on a first additional delay time to the audio output device, and output a second audio signal based on a second additional delay time 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 of the first sound based on the first audio signal output from the audio output device is greater than or equal to the additional delay time of the third sound based on the third audio signal output from the audio output device. Therefore, sound synchronization can be performed in the case where the sound output device and the image display device output sound at the same time. In particular, by using different additional delay times, sound synchronization can be performed in the case where the sound output device and the image display device output sound at the same time. In addition, when the image display device outputs sound alone, sound with a smaller delay can be output.

[0029] In addition, in the simultaneous sound output mode, the signal processing device can be configured to calculate the first additional delay time of the first audio signal based on the audio format information or audio processing time information of the sound output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0030] In addition, the interface can be configured to receive audio format information or audio processing time information from the sound output device, wherein, in the simultaneous sound output mode, the signal processing device can be 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. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0031] In addition, in the simultaneous sound output mode, the signal processing device can be 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 and the audio format information or audio processing time information of the sound output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0032] In addition, in the simultaneous sound output mode, the signal processing device can be 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, the output time information of the sound output device, and the audio format information or audio processing time information of the sound output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0033] In addition, as the level of the output time information of the sound output device increases, or the level of the audio processing time information of the audio driver decreases, or the level of the audio processing time information of the sound output device increases, the signal processing device can be configured to increase the first additional delay time of the first audio signal. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0034] In addition, after the sound output device is turned on, the interface can be configured to receive the audio format information or audio processing time information of the sound output device through the first transmission line, wherein in the simultaneous sound output mode, the interface can be configured to transmit the second audio signal to the sound output device through the second transmission line. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0035] In addition, when the sound output device is turned off during operation in the simultaneous sound output mode, the signal processing device can be configured to switch to a single sound output mode in which the audio output device outputs sound alone. Therefore, it is possible to quickly switch from the simultaneous sound output mode to the single sound output mode.

[0036] In addition, when displaying the broadcast video on the display, the signal processing device can be configured to control the first additional delay time of the first sound based on the first audio signal output from the audio output device to be greater than or equal to the additional delay time of the third sound based on the third audio signal output from the audio output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sounds at the same time, and sound suitable for the broadcast video can be output in a single sound output mode.

[0037] In addition, the signal processing device can be configured to control the first additional delay time of the first sound based on the first audio signal output from the audio output device when the movie video is displayed on the display to be greater than the first additional delay time of the first sound based on the first audio signal output from the audio output device when the broadcast video is displayed on the display. Therefore, sound synchronization can be performed when the sound output device and the image display device output sounds at the same time, and sound suitable for the movie video can be output in a single sound output mode.

[0038] According to another embodiment of the present disclosure, an image display device includes: a display; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; and a signal processing device, in a simultaneous sound output mode of the sound output device and the audio output device, configured to calculate a first additional delay time based on audio format information or audio processing time information of the sound output device, so as to 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 to the sound output device, the second additional delay time being lower in level than the first additional delay time. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound simultaneously.

[0039] In addition, the interface can be configured to receive audio format information or audio processing time information from the sound output device, wherein, in the simultaneous sound output mode, the signal processing device can be 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. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0040] In addition, in the simultaneous sound output mode, the signal processing device can be 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 and the audio format information or audio processing time information of the sound output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0041] In addition, in the simultaneous sound output mode, the signal processing device can be 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, the output time information of the sound output device, and the audio format information or audio processing time information of the sound output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0042] In addition, as the level of the output time information of the sound output device increases, or the level of the audio processing time information of the audio driver decreases, or the 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. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0043] According to another embodiment of the present disclosure, an image display device includes: a display; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; and a signal processing device, in a simultaneous sound output mode of the sound output device and the audio output device, configured to output a first audio signal based on a first additional delay time to the audio output device, and output a second audio signal based on a second additional delay time to the sound output device, the second additional delay time being lower in level than the first additional delay time, wherein the interface is configured to: after the sound output device is turned on, receive audio format information or audio processing time information of the sound output device through a first transmission line; and in the simultaneous sound output mode, send the second audio signal to the sound output device through a second transmission line. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound simultaneously.

[0044] In addition, the interface can be configured to receive audio format information or audio processing time information from the sound output device, wherein, in the simultaneous sound output mode, the signal processing device can be 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. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0045] In addition, in the simultaneous sound output mode, the signal processing device can be 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 and the audio format information or audio processing time information of the sound output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time.

[0046] In addition, in the simultaneous sound output mode, the signal processing device can be 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, the output time information of the sound output device, and the audio format information or audio processing time information of the sound output device. Therefore, sound synchronization can be performed when the sound output device and the image display device output sound at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a diagram showing an image display system according to an embodiment of the present disclosure;

[0048] Figure 2 yes Figure 1 An example of an internal block diagram of an image display device;

[0049] Figure 3 yes Figure 2 An example of an internal block diagram of a signal processing device;

[0050] Figure 4A is shown for controlling Figure 2 A diagram of the method of the remote control shown;

[0051] Figure 4B yes Figure 2 The internal block diagram of the remote control shown;

[0052] Figure 5 yes Figure 1 An internal block diagram of a sound output device;

[0053] Figure 6 is an example of an internal block diagram showing an image display device according to an embodiment of the present disclosure;

[0054] Fig. 7A and Figure 7B is Figure 6 Figures mentioned in the description;

[0055] Fig. 8A is a flowchart illustrating an operation method of an image display device according to an embodiment of the present disclosure;

[0056] Figure 8B is a flowchart illustrating an operating method of an image display device according to another embodiment of the present disclosure; and

[0057] FIG. 9A to FIG. 11B is Fig. 8A and Figure 8B The figure mentioned in the description. DETAILED DESCRIPTION

[0058] The present disclosure is further described in detail below with reference to the accompanying drawings.

[0059] Regarding the constituent elements used in the following description, the suffixes "module" and "unit" are given only for ease of consideration when preparing the specification, and do not have or serve as different meanings. Therefore, the suffixes "module" and "unit" may be used interchangeably.

[0060] Figure 1 is a diagram showing an image display system according to an embodiment of the present disclosure.

[0061] 1 , an image display system 10 according to an embodiment of the present disclosure may include an image display apparatus 100 including a display 180 and a sound output device 400 .

[0062] The image display system 10 may include a set-top box 300 , a sound output device 400 , and a server 600 .

[0063] The image display apparatus 100 according to an embodiment of the present disclosure may receive an image from the set-top box 300 or the server 600 .

[0064] For example, the image display device 100 may receive an image signal from the set-top box 300 through an HDMI terminal.

[0065] In another example, the image display device 100 can be connected to the network terminal or the network interface 135 (see Figure 2 ) receives an image signal from the server 600.

[0066] In yet another example, the image display device 100 may be configured to receive an external tuner through the internal tuner device 110 (see Figure 2 ) to receive broadcast signals.

[0067] In addition, the image display device 100 according to the embodiment of the present disclosure may include a display 180, an audio output device 185 configured to output sound (see Figure 2 ), an interface 130a configured to exchange data with an external sound output device 400 (see Figure 6 ), and the signal processing device 170 (see Figure 2 ), in the simultaneous sound output mode in which the sound output device 400 and the audio output device 185 simultaneously output sound, the signal processing device 170 is configured to output a first audio signal based on the first additional delay time to the audio output device 185, and output a second audio signal based on the second additional delay time to the sound output device 400. Therefore, sound synchronization can be performed in the case where the sound output device 400 and the image display device simultaneously output sound. In particular, by using different additional delay times, sound synchronization can be performed in the case where the sound output device 400 and the image display device simultaneously output sound.

[0068] In addition, in a single sound output mode in which the audio output device 185 outputs sound alone, the signal processing device 170 in the image display device 100 according to an embodiment of the present disclosure may perform control to output a third audio signal to the audio output device 185. Therefore, when the image display device 100 outputs sound alone, the sound with less delay may be output.

[0069] In addition, the display 180 may be implemented with any of various panels. For example, the display 180 may be any of a liquid crystal display (LCD) panel, an organic light emitting diode (OLED) panel, an inorganic light emitting diode (LED) panel, and the like.

[0070] also, Figure 1 The illustrated image display apparatus 100 may be a TV, a monitor, a tablet PC, a mobile device, or the like.

[0071] Figure 2 yes Figure 1 The image shown is a block diagram of a display device.

[0072] Reference Figure 2 , the image display apparatus 100 according to an embodiment of the present disclosure may include an image receiver 105 , an external device interface 130 , a memory 140 , a user input interface 150 , a sensor device 1220 , a signal processing device 170 , a display 180 , and an audio output device 185 .

[0073] The image receiver 105 may include a tuner device 110 , a demodulator 120 , a network interface 135 , and an external device interface 130 .

[0074] and Figure 2 Differently, the image receiver 105 may include only the tuner device 110, the demodulator 120, and the external device interface 130. That is, the image receiver 105 may not include the network interface 135.

[0075] The tuner device 110 selects a radio frequency (RF) broadcast signal corresponding to a channel selected by a user or an RF broadcast signal corresponding to each pre-stored channel from a plurality of radio frequency (RF) broadcast signals received through an antenna (not shown). In addition, the tuner device 110 downconverts the selected RF broadcast signal into an intermediate frequency (IF) signal or a baseband audio / video (A / V) signal.

[0076] For example, if the selected RF broadcast signal is a digital broadcast signal, the tuner device 110 down-converts the selected RF broadcast signal into a digital IF signal. On the other hand, if the selected RF broadcast signal is an analog broadcast signal, the tuner device 110 down-converts the selected RF broadcast signal into an analog baseband A / V signal (CVBS / SIF). That is, the tuner device 110 can process a digital broadcast signal or an analog broadcast signal. The analog baseband A / V signal CVBS / SIF from the tuner device 110 can be directly provided to the signal processing device 170.

[0077] Furthermore, the tuner device 110 may include a plurality of tuners for receiving broadcast signals of a plurality of channels, or a single tuner for simultaneously receiving broadcast signals of a plurality of channels.

[0078] The demodulator 120 receives the digital IF signal from the tuner device 110 and demodulates the digital IF signal.

[0079] The demodulator 120 may perform demodulation and channel decoding on the digital IF signal, thereby obtaining a stream signal TS. The stream signal TS may be a signal in which an image signal, an audio signal, and / or a data signal are multiplexed.

[0080] The stream signal output from the demodulator 120 may be input to the signal processing device 170 and then undergo demultiplexing and A / V signal processing. The signal processing device 170 outputs the processed video and audio signals to the display 180 and the audio output device 185, respectively.

[0081] The external device interface 130 may transmit and receive data with a connected external device (not shown) such as a set-top box. To this end, the external device interface 130 may include an A / V input / output (I / O) device (not shown).

[0082] The external device interface 130 may be wirelessly or wiredly connected to an external device such as a digital versatile disk (DVD) player, a Blu-ray disc (BD) player, a game console, a camera, a camcorder, a computer (e.g., a laptop computer), or a set-top box. The external device interface 130 may then send and receive signals to and from the external device.

[0083] The A / V input and output device may receive audio and image signals from an external device, and the wireless communicator (not shown) may perform short-range wireless communication with another electronic device.

[0084] The external device interface 130 may exchange data with a nearby mobile terminal through a wireless communicator (not shown). In particular, the external device interface 130 may receive device information, running application information, application images, etc. from the mobile terminal in a mirroring mode.

[0085] The network interface 135 serves as an interface between the image display device 100 and a wired / wireless network such as the Internet. For example, the network interface 135 may receive content or data from the Internet or from a content provider (CP) or a network provider (NP) through a network.

[0086] Additionally, network interface 135 may include a wireless communicator (not shown).

[0087] The memory 140 may store a program required for the signal processing device 170 to process signals and control, and may also store a signal-processed image, audio, or data signal.

[0088] In addition, the memory 140 may also temporarily store an audio, video or data signal received from the external device interface 130. The memory 140 may store information on broadcast channels through a channel adding function.

[0089] Although the memory 140 is Figure 2 140 is shown as being configured separately from the signal processing device 170 , but the present disclosure is not limited thereto, and the memory 140 may be incorporated into the signal processing device 170 .

[0090] The user input interface 150 transmits a signal received from a user to the signal processing device 170 or transmits a signal received from the signal processing device 170 to the user.

[0091] For example, the user input interface 150 can send / receive user input signals such as power on / off signals, channel selection signals, screen setting signals, etc. to / from the remote control 200, can provide the signal processing device 170 with user input signals such as inputs received from local keys (not shown), such as a power key, a channel key, a volume key, a set value, etc., can send to the signal processing device 170 a user input signal received from a sensor device 1220 that senses user gestures, or can send to the sensor device 1220 a signal received from the signal processing device 170.

[0092] The signal processing device 170 may demultiplex a stream signal received from the tuner device 110 , the demodulator 120 , the network interface 135 , or the external device interface 130 into a plurality of signals and process the demultiplexed signals into audio and image signals.

[0093] For example, the signal processing device 170 may receive an HDMI signal or a broadcast signal received by the image receiver 105 and output a processed image signal by processing the received broadcast signal or the received HDMI signal.

[0094] The image signal processed by the signal processing device 170 may be displayed as an image corresponding to the image signal on the display 180. The image signal processed by the signal processing device 170 may also be transmitted to an external output device through the external device interface 130.

[0095] The audio signal processed by the signal processing device 170 may be output to the audio output device 185. Also, the audio signal processed by the signal processing device 170 may be transmitted to an external output device through the external device interface 130.

[0096] Although Figure 2 1, but the signal processing device 170 may include a demultiplexer (DEMUX) and a video processor, which will be referred to later. Figure 3 That is, the signal processing device 170 can process various types of signals and thus can be implemented in the form of a system on a chip (SOC). Figure 3 Describe in more detail.

[0097] In addition, the signal processing device 170 may provide overall control to the image display apparatus 100. For example, the signal processing device 170 may control the tuner device 110 to select an RF broadcast signal corresponding to a user-selected channel or a pre-stored channel.

[0098] The signal processing device 170 may control the image display apparatus 100 according to a user command received through the user input interface 150 or according to an internal program.

[0099] The signal processing device 170 may control the display 180 to display an image. The image displayed on the display 180 may be a two-dimensional (2D) or three-dimensional (3D) still image or video.

[0100] The signal processing device 170 may control a specific 2D object in an image displayed on the display 180. For example, the specific 2D object may be at least one of a linked web page (e.g., from a newspaper or magazine), an electronic program guide (EPG), a menu, a widget, an icon, a still image, a video, or a text.

[0101] The signal processing device 170 can locate the user based on the image captured by the camera device (not shown). For example, the signal processing device 170 can determine the distance (z-axis coordinate) between the user and the image display device 100. In addition, the signal processing device 170 can determine the x-axis and y-axis coordinates corresponding to the position of the user on the display 180.

[0102] The display 180 generates a driving signal by converting a processed image signal, a processed data signal, an on screen display (OSD) signal, and a control signal received from the signal processing device 170 or an image signal, a data signal, and a control signal received from the external device interface 130 .

[0103] Furthermore, the display 180 may also be a touch screen that can be used as both an output device and an input device.

[0104] The audio output device 185 may receive the processed audio signal from the signal processing device 170 and output the received audio signal as voice.

[0105] A camera device (not shown) captures the user. The camera device may include, but is not limited to, a single camera. When necessary, the camera device may include multiple cameras. Image information captured by the camera device may be provided to the signal processing device 170.

[0106] The signal processing device 170 may sense a user's gesture from a captured image received from a camera device (not shown) or a signal received from the sensor device 1220 alone or in combination.

[0107] The power supply 190 supplies power throughout the image display apparatus 100. In particular, the power supply 190 may supply power to a signal processing device 170 which may be implemented as a system on chip (SOC), a display 180 for displaying an image, an audio output device 185 for outputting an audio signal, and the like.

[0108] Specifically, the power supply 190 may include a converter for converting alternating current (AC) power into direct current (DC) power and a DC / DC converter for converting a level of DC power.

[0109] The remote controller 200 transmits the user input to the user input interface 150. To transmit the user input, the remote controller 200 may operate based on various communication standards such as Bluetooth, RF communication, IR communication, ultra-wideband (UWB), and ZigBee. In addition, the remote controller 200 may receive an image signal, an audio signal, and / or a data signal from the user input interface 150, and may output the received signal as an image or sound.

[0110] The above-mentioned image display device 100 may be a fixed or mobile digital broadcast receiver.

[0111] also, Figure 2The block diagram of the image display device 100 shown is a block diagram of an embodiment of the present disclosure. Each component of the block diagram can be integrated, added or omitted according to the specification of the image display device 100 actually implemented. That is, two or more components can be combined into a single component as needed, or a single component can be divided into two or more components. In order to illustrate the embodiment of the present disclosure, the functions performed in each block are described, and the specific operations and devices do not limit the scope of the present disclosure.

[0112] Figure 3 yes Figure 2 A block diagram of a signal processing device is shown.

[0113] refer to Figure 3 , the signal processing device 170 may include a DEMUX 310, an image processor 320, a processor 330, and an audio processor 370. The signal processing device 170 may further include a data processor (not shown).

[0114] The DEMUX 310 demultiplexes the input stream. For example, the DEMUX 310 may demultiplex an MPEG-2TS into an image signal, an audio signal, and a data signal. The input stream signal may be received from the tuner device 110, the demodulator 120, or the external device interface 130.

[0115] The image processor 320 may perform signal processing based on the received image. For example, the image processor 320 may perform image processing based on the image signal demultiplexed by the DEMUX 310.

[0116] To this end, the image processor 320 may include a video decoder 325, a scaler 335, an image quality processor 635, a video encoder (not shown), an OSD processor 340, a frame rate converter (FRC) 350, a formatter 360, and the like.

[0117] The video decoder 325 decodes the demultiplexed image signal, and the scaler 335 scales the resolution of the decoded image signal so that the image signal can be displayed on the display 180 .

[0118] The video decoder 325 may be provided with decoders operating in accordance with various standards. For example, the video decoder 325 may include, for example, an MPEG-2 decoder, an H.264 decoder, a 3D video decoder for color images, depth images, a decoder for multi-view images, and the like.

[0119] The scaler 335 may scale the received image signal decoded by the video decoder 325 .

[0120] For example, when the size or resolution of the received image signal is small and low, the scaler 335 may upscale the received image signal. When the size or resolution of the received image signal is large and high, the scaler 335 may downscale the received image signal.

[0121] The image quality processor 635 may perform image quality processing based on the received image signal decoded by the video decoder 325 .

[0122] For example, the image quality processor 635 may reduce noise of a received image signal, expand the grayscale resolution of a received image signal, enhance image resolution, perform high dynamic range (HDR) based signal processing, change a frame rate, or perform image quality processing to correspond to characteristics of a panel.

[0123] The OSD processor 340 generates an OSD signal autonomously or according to a user input. For example, the OSD processor 340 may generate a signal according to a user input signal, by which various information is displayed as graphics or text on the display 180. The OSD signal may include various data such as a user interface (UI), various menus, widgets, and icons. The generated OSD signal may include a 2D or 3D object.

[0124] In addition, the OSD processor 340 may generate a pointer to be displayed on the display 180 based on the pointing signal received from the remote controller 200. In particular, the pointer may be generated from a pointing signal processing device (not shown) that may reside in the OSD processor 340. Obviously, the pointing signal processing device may be configured separately from the OSD processor 340.

[0125] The FRC 350 may change the frame rate of a received image signal or simply output the image signal without frame rate conversion.

[0126] The formatter 360 may change the format of the received image signal into an image signal to be displayed on a display.

[0127] In particular, the formatter 360 may change the format of the received image signal to correspond to the characteristics of the display panel.

[0128] In addition, the formatter 360 may change the format of the image signal. For example, the formatter 360 may change the format of the 3D image signal to one of various 3D formats, such as a side-by-side format, an over / under format, a frame sequential format, an interlaced format, and a checkerboard format.

[0129] The processor 330 may control overall operations in the image display apparatus 100 or the signal processing device 170 .

[0130] For example, the processor 330 may control the tuner device 110 to tune to an RF broadcast signal corresponding to a channel selected by a user or a pre-stored channel.

[0131] The processor 330 may control the image display apparatus 100 according to a user command received through the user input interface 150 or according to an internal program.

[0132] In addition, the processor 330 may control data transmission through the network interface 135 or the external device interface 130 .

[0133] In addition, the processor 330 may control operations of the DEMUX 310 and the image processor 320 in the signal processing device 170 .

[0134] The audio processor 370 of the signal processing device 170 may process the demultiplexed audio signal. For audio signal processing, the audio processor 370 may have a plurality of decoders.

[0135] The audio processor 370 of the signal processing device 170 may also adjust the bass, treble, and volume of the audio signal.

[0136] The data processor (not shown) of the signal processing device 170 may process the data signal obtained by demultiplexing the input stream signal. For example, if the demultiplexed data signal is an encoded data signal, the data processor may decode the encoded data signal. The encoded data signal may be an EPG including broadcast information specifying the start time, end time, etc. of a pre-scheduled broadcast program for each channel.

[0137] also, Figure 3 The block diagram of the signal processing device 170 shown is purely exemplary. Depending on the specifications of the signal processing device 170 in actual implementation, components of the signal processing device 170 may be combined or omitted, or new components may be added.

[0138] In particular, the FRC 350 and the formatter 360 may be provided separately from the image processor 320 .

[0139] Figure 4A is shown for controlling Figure 2 FIG. 10 shows a method of using a remote controller.

[0140] Figure 4A (a) shows a pointer 205 displayed on the display 180 indicating movement of the remote controller 200 .

[0141] Users can move up, down, left, and right ( Figure 4A (b)) and before and after ( Figure 4A(c)) moves or rotates the remote controller 200. The pointer 205 displayed on the display 180 corresponds to the movement of the remote controller 200. Since the pointer 205 moves according to the movement of the remote controller 200 in the 3D space, the remote controller 200 may be referred to as the remote controller 200 or a 3D pointing device.

[0142] refer to Figure 4A In (b), if the user moves the remote controller 200 to the left, the pointer 205 moves to the left on the display 180.

[0143] The sensor of the remote controller 200 detects the movement of the remote controller 200 and transmits movement information corresponding to the detection result to the image display device. Then, the image display device can calculate the coordinates of the pointer 205 based on the movement information of the remote controller 200. The image display device then displays the pointer 205 at the calculated coordinates.

[0144] refer to Figure 4A (c), while pressing a predetermined button of the remote controller 200, the user moves the remote controller 200 away from the display 180. Then, the selected area corresponding to the pointer 205 may be zoomed in and enlarged on the display 180. On the contrary, if the user moves the remote controller 200 toward the display 180, the selected area corresponding to the pointer 205 is reduced and thus shrunk on the display 180. On the other hand, when the remote controller 200 moves away from the display 180, the selected area may be zoomed out, and when the remote controller 200 approaches the display 180, the selected area may be enlarged.

[0145] In the case where a predetermined button is pressed in the remote controller 200, the up, down, left, and right movements of the remote controller 200 may be ignored. That is, when the remote controller 200 is away from or close to the display 180, only the front and back movements of the remote controller 200 are sensed, and the up, down, left, and right movements of the remote controller 200 are ignored. Unless a predetermined button is pressed in the remote controller 200, the pointer 205 moves according to the up, down, left, and right movements of the remote controller 200.

[0146] The speed and direction of the pointer 205 may correspond to the speed and direction of the remote controller 200 .

[0147] Figure 4B yes Figure 2 The block diagram of the remote control is shown.

[0148] refer to Figure 4B , remote controller 200 may include a wireless communicator 425 , a user input device 435 , a sensor device 440 , an output device 450 , a power supply 460 , a memory 470 , and a controller 480 .

[0149] The wireless communicator 425 transmits and / or receives a signal to and / or from one of the image display devices according to the embodiment of the present disclosure. The image display device according to the embodiment of the present disclosure, that is, the image display device 100 will be taken as an example.

[0150] In this embodiment, the remote controller 200 may include an RF module 421 for sending RF signals to the image display device 100 and / or receiving RF signals from the image display device 100 according to the RF communication standard. In addition, the remote controller 200 may include an IR module 423 for sending IR signals to the image display device 100 and / or receiving IR signals from the image display device 100 according to the IR communication standard.

[0151] In this embodiment, the remote controller 200 may transmit a signal carrying information about the movement of the remote controller 200 to the image display apparatus 100 through the RF module 421 .

[0152] In addition, the remote controller 200 may receive a signal from the image display device 100 through the RF module 421. The remote controller 200 may send a command such as a power on / off command, a channel switching command, or a volume change command to the image display device 100 through the IR module 423 as needed.

[0153] The user input device 435 may include a keypad, a plurality of buttons, a touch pad, or a touch screen. The user may input commands to the image display device 100 by manipulating the user input device 435. If the user input device 435 includes a plurality of physical key buttons, the user may input various commands to the image display device 100 by pressing the physical key buttons. If the user input device 435 includes a touch screen displaying a plurality of virtual keys, the user may input various commands to the image display device 100 by touching the virtual keys. The user input device 435 may also include various input tools other than those set forth herein, such as scroll keys and / or jog keys, which should not be construed as limiting the present disclosure.

[0154] The sensor device 440 may include a gyro sensor 441 and / or an acceleration sensor 443. The gyro sensor 441 may sense movement of the remote controller 200.

[0155] For example, the gyro sensor 441 may sense motion information about the remote controller 200 in the X-axis, Y-axis, and Z-axis directions. The acceleration sensor 443 may sense the moving speed of the remote controller 200. The sensor device 440 may further include a distance sensor for sensing the distance between the remote controller 200 and the display 180.

[0156] The output device 450 may output a video and / or audio signal corresponding to the manipulation of the user input device 435 or a signal transmitted by the image display apparatus 100. The user may easily recognize whether the user input device 435 has been manipulated or the image display apparatus 100 has been controlled based on the video and / or audio signal output from the output device 450.

[0157] For example, the output device 450 may include an LED module 451 that is turned on or off whenever the user input device 435 is manipulated or whenever a signal is received from or transmitted to the image display device 100 through the wireless communicator 425, a vibration module 453 that generates vibrations, an audio output module 455 that outputs audio data, or a display module 457 that outputs an image.

[0158] The power supply 460 supplies power to the remote controller 200. If the remote controller 200 remains stationary for a predetermined time or longer, the power supply 460 may, for example, cut off the power supply to the remote controller 200 in order to save power. If a specific key on the remote controller 200 is manipulated, the power supply 460 may resume the power supply.

[0159] The memory 470 may store various programs and application data for controlling or operating the remote controller 200. The remote controller 200 may wirelessly transmit and / or receive signals to and / or from the image display device 100 in a predetermined frequency band through the RF module 421. The controller 480 of the remote controller 200 may store information about a frequency band used by the remote controller 200 to wirelessly transmit and / or receive signals to and / or from a paired image display device 100 in the memory 470, and may then refer to the information for later use.

[0160] Controller 480 provides overall control to remote controller 200. For example, controller 480 may transmit a signal corresponding to key manipulation detected from user input device 435 or a signal corresponding to motion of remote controller 200 sensed by sensor device 440 to image display apparatus 100 through wireless communicator 425.

[0161] The user input interface 150 of the image display device 100 may include a wireless communication module 411 that wirelessly sends signals to the remote control 200 and / or wirelessly receives signals from the remote control 200, and a coordinate calculator 415 that calculates coordinates representing the position of the remote control 200 on the display screen, which will move according to the movement of the remote control 200.

[0162] The user input interface 150 may wirelessly transmit and / or receive RF signals to and / or from the remote controller 200 through the RF module 412. In addition, the user input interface 150 may wirelessly receive IR signals from the remote controller 200 through the IR module 413 according to the IR communication standard.

[0163] The coordinate calculator 415 may receive motion information about the movement of the remote controller 200 through the wireless communication module 411, and may calculate coordinates (x, y) representing the position of the pointer 205 on the screen of the display 180 by correcting the motion information for possible errors or user hand tremors.

[0164] The signal received from the remote controller 200 through the user input interface 150 in the image display device 100 may be transmitted to the signal processing device 170. Then, the signal processing device 170 may acquire information about the movement of the remote controller 200 and information about the key manipulation detected from the remote controller 200 from the signal received from the remote controller 200, and may control the image display device 100 based on the acquired information.

[0165] In another example, the remote controller 200 may calculate the coordinates of the position to which the pointer will shift corresponding to its movement, and output the coordinates to the user input interface 150 of the image display device 100. In this case, the user input interface 150 may transmit information about the pointer coordinates that are not corrected for possible errors or user hand tremors to the signal processing device 170.

[0166] In another example, Figure 2 The configuration of the remote controller 200 shown is different, and the coordinate calculator 415 may be provided in the signal processing device 170 instead of the user input interface 150 .

[0167] Figure 5 It is shown Figure 1 Internal block diagram of a sound output device.

[0168] Referring to the drawings, the sound output device 400 may include a sensor 530, a communication device 535, a memory 540, an interface 550, an audio output device 560, a controller 570, an input unit 585, and a power supply 590. When implemented in actual applications, two or more of these components may be combined into a single component as needed, or a single component may be divided into two or more components.

[0169] The sensor 530 may include an inertial sensor (not shown). The inertial sensor may include an acceleration sensor, a gyro sensor, a gravity sensor, etc. For example, the acceleration sensor, the gyro sensor, the gravity sensor, etc. may include a 6-axis sensor.

[0170] The sensor 530 may output motion information such as motion information on the x, y, and z axes (acceleration information, angular velocity information), position information, and the like of the sound output device 400 .

[0171] In addition, the sensor 530 may sense temperature information or current information or voltage information of the sound output device.

[0172] In addition, the communication device 535 may provide an interface for communicating with an external device. To this end, the communication device 535 may include a first communication module 535a and a second communication module 535b.

[0173] For example, the first communication module 535a in the communication device 535 may be a wireless communication module and may provide an interface for wireless data communication such as Bluetooth.

[0174] For example, the second communication module 535 b in the communication device 535 may be a wireless communication module, and may provide an interface for wireless data communication such as Wi-Fi, UWB, etc.

[0175] The memory 540 may store a program for processing or controlling by the controller 570 in the sound output device 400 and may also temporarily store input / output data.

[0176] For example, the memory 540 may store audio format information or audio processing time information of the sound output device 400 .

[0177] The interface 550 may provide an interface for wired data communication such as HDMI.

[0178] For example, the interface 550 may transmit audio format information or audio processing time information of the sound output device 400 to the image display device 100 .

[0179] The audio output device 560 may output sound based on the audio signal processed by the controller 570 of the sound output device 400 .

[0180] The controller 570 may control the overall operation of the sound output device 400 by controlling the operation of each unit of the sound output device 400 .

[0181] In addition, the controller 570 may perform signal processing on an audio signal received from an external source.

[0182] In addition, the controller 570 may reproduce an audio signal received from the first communication module 535a or the second communication module 535b.

[0183] In addition, the input unit 585 may include a button for initializing the sound output device 400 or an operation input button, etc.

[0184] Furthermore, the input unit 585 may include a microphone 587 for sound collection.

[0185] In addition, the input unit 585 may include a camera (not shown) for capturing images.

[0186] The power supply 590 may supply power required for the operation of each component under the control of the controller 570 .

[0187] In particular, the power supply 590 may include a battery (not shown) that stores and outputs DC power.

[0188] Figure 6 is an internal block diagram showing an image display device according to an embodiment of the present disclosure.

[0189] 1 , the image display apparatus 100 according to an embodiment of the present disclosure includes a display 180 , an audio output device 185 configured to output sound, an interface 130 a configured to exchange data with an external sound output device 400 , and a signal processing device 170 .

[0190] The interface 130a may be an HDMI interface.

[0191] In addition, the interface 130 a may receive audio format information from the sound output device 400 or audio processing time information Sd corresponding to the audio format information of the sound output device 400 .

[0192] In the simultaneous sound output mode in which the sound output device 400 and the audio output device 185 simultaneously output sound, the signal processing device 170 may perform control to output the first audio signal Stv based on the first additional delay time to the audio output device 185 and to output the second audio signal Sau based on the second additional delay time to the sound output device 400. Therefore, sound synchronization may be performed in the case where the sound output device 400 and the image display device simultaneously output sound. In particular, by using different additional delay times, sound synchronization may be performed in the case where the sound output device 400 and the image display device simultaneously output sound.

[0193] In addition, in a mono output mode in which the audio output device 185 outputs sound alone, the signal processing device 170 may perform control to output the third audio signal Stt to the audio output device 185 .

[0194] For example, in a single sound output mode in which the audio output device 185 outputs sound alone, if the level of the video processing time information of the input image signal is greater than the level of the audio processing time information of the audio output device 185, the signal processing device 170 may perform control to output a third audio signal Stt based on a third additional delay time corresponding to the difference between the levels to the audio output device 185. In this case, the third additional delay time is less than the first additional delay time or the second additional delay time. Therefore, when the image display device 100 outputs sound alone, sound with less delay may be output.

[0195] In another example, in a mono output mode in which the audio output device 185 outputs sound alone, if the level of the video processing time information of the input image signal is lower than the level of the audio processing time information of the audio output device 185, the signal processing device 170 may perform control so that the third additional delay time corresponding to the difference between the levels is added to the image signal instead of the third audio signal Stt. Therefore, the additional delay time of the third audio signal Stt may be at level 0, and thus when the image display apparatus 100 outputs sound alone, sound with less delay may be output compared to the case of simultaneous output.

[0196] In addition, the signal processing device 170 may include: an interface controller 630 configured to control the interface 130a; and a delay controller 611 configured to calculate the delay time of the audio signal based on the audio format information received from the interface 130a or the interface controller 630 or the audio processing time information Sd of the sound output device 400.

[0197] In addition, in the simultaneous output mode, the delay controller 611 in the signal processing device 170 can output a first audio signal based on the calculated first additional delay time to the first audio output driver 640, and can output a second audio signal based on the calculated second additional delay time to the second audio output driver 645.

[0198] In addition, in the simultaneous sound output mode, the first audio output driver 640 in the signal processing device 170 can output the first audio signal Sada that has passed through the low-pass filter 642 to the audio output device 185.

[0199] In addition, in the simultaneous sound output mode, the second audio output driver 645 in the signal processing device 170 may output the second audio signal Sadb as a full-band signal to the interface 130a.

[0200] Therefore, in the simultaneous sound output mode, the low-pass filtered first sound may be output from the audio output device 185 , and the second sound as a full-band sound signal may be output from the sound output device 400 .

[0201] Furthermore, in the monaural output mode, the first audio output driver 640 in the signal processing device 170 may output a third audio signal Stt to the audio output device 185 , where the third audio signal Stt is a full-band signal that does not pass through the low-pass filter 642 .

[0202] Therefore, in the mono sound output mode, the third sound as a full-band sound signal may be output from the audio output device 185 .

[0203] In addition, the signal processing device 170 may further include an audio driver 607 configured to process an audio signal, a video driver 609 configured to process a video signal, an audio delay table 621 , and a video delay table 623 .

[0204] In addition, the audio signal Sao processed by the audio driver 607 may be input to the delay controller 611 .

[0205] In addition, the video signal Svo processed by the video driver 609 may be input to the delay controller 611 .

[0206] In addition, the audio delay table 621 can output the audio processing time information FDa for the audio driver 607 to the delay controller 611 in an audio format.

[0207] In this case, the audio processing time information FDa for the audio driver 607 in the audio format may correspond to the audio processing time information for the audio output device 185 .

[0208] In addition, the video delay table 623 may output video processing time information FDv for the video driver 609 to the delay controller 611 in a video format.

[0209] In addition, in the simultaneous sound output mode, the delay controller 611 in the signal processing device 170 may calculate the first additional delay time of the first audio signal Stv based on the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 .

[0210] In addition, in the simultaneous sound output mode, the delay controller 611 in the signal processing device 170 can calculate the first additional delay time of the first audio signal and the second additional delay time of the second audio signal based on the video processing time of the input video signal in the video driver 609, the audio processing time information Sd corresponding to the audio format information of the sound output device 400, the audio processing time in the audio driver 607, and the time of output processing of the sound output device 400.

[0211] Specifically, in the simultaneous sound output mode, the delay controller 611 in the signal processing device 170 can perform control to increase the first additional delay time of the first audio signal as the video processing time of the input video signal in the video driver 609 increases, or the audio processing time based on the audio format information of the sound output device 400 increases, or the audio processing time in the audio driver 607 decreases, or the time for output processing of the sound output device 400 increases.

[0212] In addition, in the simultaneous sound output mode, the delay controller 611 in the signal processing device 170 can perform control to increase the second additional delay time of the second audio signal as the video processing time of the input video signal in the video driver 609 increases or the audio processing time based on the audio format information of the sound output device 400 decreases or the audio processing time in the audio driver 607 decreases or the time for output processing of the sound output device 400 decreases.

[0213] Furthermore, if the video processing time of the input video signal is greater than the sum of the delays of the sound output device 400 , the delay controller 611 in the signal processing device 170 may calculate the first additional delay time and the second additional delay time based on the video processing time of the output video signal.

[0214] That is, the second additional delay time may be smaller than the first additional delay time. Therefore, the sound synchronized with the video signal may be output from the audio output device 185 and the sound output device 400.

[0215] In addition, if the sum of the delays of the sound output device 400 is greater than the video processing time of the input video signal, the delay controller 611 in the signal processing device 170 may calculate the first additional delay time and the second additional delay time based on the sum of the delays of the sound output device 400. Therefore, the sound synchronized with the video signal may be output from the audio output device 185 and the sound output device 400.

[0216] Furthermore, in the mono output mode, the delay controller 611 in the signal processing device 170 may output the third audio signal based on the calculated third additional delay time while ignoring the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 .

[0217] In addition, in the mono output mode, the delay controller 611 in the signal processing device 170 can calculate the third additional delay time of the third audio signal based on the video processing time of the input video signal, while ignoring the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400.

[0218] In addition, in the mono output mode, the delay controller 611 in the signal processing device 170 can calculate the third additional delay time of the third audio signal based on the video processing time of the input video signal in the video driver 609 and the audio processing time in the audio driver 607, while ignoring the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400.

[0219] For example, in mono output mode, if the video processing time of the input video signal in the video driver 609 is greater than the audio processing time in the audio driver 607, the delay controller 611 in the signal processing device 170 may calculate a third additional delay time of the third audio signal for synchronization with the video signal.

[0220] Specifically, in the mono output mode, if the video processing time of the input video signal in the video driver 609 is greater than the audio processing time in the audio driver 607, the delay controller 611 in the signal processing device 170 may perform control to increase the third additional delay time as the video processing time of the input video signal increases or as the audio processing time in the audio driver 607 decreases.

[0221] That is, in the mono output mode, the delay controller 611 in the signal processing device 170 may calculate a third additional delay time based on the audio processing time information for the audio output device 185, and may output a third audio signal based on the calculated third additional delay time.

[0222] Furthermore, if the sound output device 400 is turned off during operation in the simultaneous sound output mode, the signal processing device 170 may perform control to switch to a single sound output mode in which the audio output device 185 outputs sound alone. Therefore, it is possible to quickly switch from the simultaneous sound output mode to the single sound output mode.

[0223] Fig. 7A and Figure 7B is Figure 6The figure mentioned in the description.

[0224] first, Fig. 7A and Figure 7B is a diagram showing an example of an interface scheme between an image display apparatus and a sound output device.

[0225] Referring to the drawings, the image display apparatus 100 and the sound output device 400 may perform HDMI communication as a fixed line interface method.

[0226] In the drawing, the HDMI transmitter 132 may be included in the interface 130 a of the image display apparatus 100 , and the HDMI receiver 462 may be included in the interface 550 of the sound output device 400 .

[0227] A plurality of transition minimized differential signaling (TMDS) lines Lna to Lnd, a display data channel (DDC) line Lne, a CEC line LNf, a utility line LNg, and an HPD line LNh may be provided between the HDMI transmitter 132 and the HDMI receiver 462 .

[0228] In addition, when the sound output device 400 is turned on, the interface 130a of the image display apparatus 100 may receive the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 through the first transmission line LNf.

[0229] That is, the interface 130a of the image display apparatus 100 may receive the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 through the CEC line LNf.

[0230] In addition, in the simultaneous sound output mode, the interface 130a of the image display apparatus 100 may transmit the second audio signal Sau to the sound output device 400 through the second transmission line LNa or LNb. Therefore, sound synchronization may be performed when the sound output device 400 and the image display apparatus 100 simultaneously output sound.

[0231] Figure 7B It is shown Fig. 7A Figure 4 shows the CEC data format of the CEC lines in Figure 4.

[0232] Referring to the drawing, a CEC data format 700 may include a plurality of information bits, EOM, and ACK.

[0233] according to Figure 7B According to the CEC data format 700 , the interface 550 of the sound output device 400 may transmit the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 .

[0234] Fig. 8A is a flowchart illustrating an operating method of an image display device according to an embodiment of the present disclosure.

[0235] 1. Referring to the drawings, the signal processing device 170 in the image display apparatus 100 according to the embodiment of the present disclosure determines whether the sound output device 400 and the audio output device 185 are in a simultaneous sound output mode (S820).

[0236] The signal processing device 170 may determine whether the simultaneous sound output mode is set based on the input signal when the setting screen is displayed.

[0237] If the simultaneous output mode is set, the signal processing device 170 may calculate a first additional delay time of the first audio signal and a second additional delay time of the second audio signal based on the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 (S830).

[0238] If the simultaneous output mode is set, the signal processing device 170 can calculate the first additional delay time of the first audio signal and the second additional delay time of the second audio signal based on the video processing time of the input video signal in the video driver 609, the audio processing time information Sd corresponding to the audio format information of the sound output device 400, the audio processing time in the audio driver 607, and the time of output processing of the sound output device 400.

[0239] Specifically, in the simultaneous sound output mode, the signal processing device 170 may perform control to increase the first additional delay time of the first audio signal as the video processing time of the input video signal in the video driver 609 increases, or the audio processing time based on the audio format information of the sound output device 400 increases, or the audio processing time in the audio driver 607 decreases, or the time for output processing of the sound output device 400 increases.

[0240] In addition, in the simultaneous sound output mode, the signal processing device 170 may perform control to increase the second additional delay time of the second audio signal as the video processing time of the input video signal in the video driver 609 increases or the audio processing time based on the audio format information of the sound output device 400 decreases or the audio processing time in the audio driver 607 decreases or the time for output processing of the sound output device 400 decreases.

[0241] In addition, if the video processing time of the input video signal is greater than the sum of the delays of the sound output device 400 , the signal processing device 170 may calculate the first additional delay time and the second additional delay time based on the video processing time of the output video signal.

[0242] For example, in the simultaneous output mode, if the video processing time of the input video signal in the video driver 609 is 100ms, the audio processing time of the PCM audio signal in the first audio format in the audio driver 607 is 10ms, the audio processing time of the PCM audio signal in the sound output device 400 is 70ms, and the output processing time of the sound output device 400 is 20ms, the video processing time has a maximum delay, so that the total delay can be set to 100ms, the first additional delay time can be set to 90ms, i.e. 100ms-10ms, and the second additional delay time can be set to 10ms, i.e. 100ms-(70ms+20ms).

[0243] That is, the second additional delay time may be smaller than the first additional delay time. Therefore, the sound synchronized with the video signal may be output from the audio output device 185 and the sound output device 400.

[0244] In addition, if the sum of the delays of the sound output device 400 is greater than the video processing time of the input video signal, the signal processing device 170 may calculate the first additional delay time and the second additional delay time based on the sum of the delays of the sound output device 400 .

[0245] For example, in the simultaneous sound output mode, if the video processing time of the input video signal in the video driver 609 is 100ms, the audio processing time of the DTS audio signal in the second audio format in the audio driver 607 is 20ms, the audio processing time of the DTS audio signal in the sound output device 400 is 120ms, and the time of the output processing of the sound output device 400 is 20ms, then it is not the video processing time but the sum of the delays of the sound output device 400 that has the maximum delay, so that the total delay can be set to 120ms+20ms=140ms, the additional delay time of the video can be set to 40ms, that is, 140ms-100ms, the first additional delay time can be set to 130ms, that is, 140ms-10ms, and the second additional delay time can be set to 0ms by considering 140ms. Therefore, the sound synchronized with the video signal can be output from the audio output device 185 and the sound output device 400.

[0246] Then, the signal processing device 170 may output a first audio signal to the audio output device 185 based on the calculated first delay time, and may output a second audio signal to the sound output device 400 based on the calculated second delay time (S840).

[0247] Then, the audio output device 185 may output a first sound corresponding to the first audio signal (S850). Therefore, the sound synchronized with the video signal may be output from the audio output device 185 and the sound output device 400.

[0248] Furthermore, in operation 820 (S820), if the simultaneous sound output mode is not set, the signal processing device 170 determines whether a single sound output mode in which the audio output device 185 outputs sound alone is set (S860).

[0249] The signal processing device 170 may determine whether the mono output mode is set based on the input signal when the setting screen is displayed.

[0250] If the mono output mode is set, the signal processing device 170 may output a third audio signal based on the calculated third additional delay time (S870) while ignoring the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400.

[0251] If the mono output mode is set, the signal processing device 170 may calculate the third additional delay time of the third audio signal based on the video processing time of the input video signal while ignoring the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 .

[0252] In the mono output mode, the signal processing device 170 can calculate the third additional delay time of the third audio signal based on the video processing time of the input video signal in the video driver 609 and the audio processing time in the audio driver 607, while ignoring the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400.

[0253] For example, in the mono output mode, if the video processing time of the input video signal in the video driver 609 is greater than the audio processing time in the audio driver 607, the signal processing device 170 may calculate a third additional delay time of the third audio signal for synchronization with the video signal.

[0254] Specifically, in the mono output mode, if the video processing time of the input video signal in the video driver 609 is greater than the audio processing time in the audio driver 607, the signal processing device 170 may perform control to increase the third additional delay time as the video processing time of the input video signal increases or the audio processing time in the audio driver 607 decreases.

[0255] For example, if the video processing time of the input video signal in the video driver 609 is 100 ms and the audio processing time of the PCM audio signal in the audio driver 607 is 10 ms, the signal processing device 170 may calculate 90 ms, which is the difference between these times, as the third additional delay time.

[0256] In another example, if the video processing time of the input video signal in the video driver 609 is 100 ms and the audio processing time of the DTS audio signal in the audio driver 607 is 20 ms, the signal processing device 170 may calculate 80 ms, which is the difference between these times, as the third additional delay time.

[0257] That is, in the mono output mode, the signal processing device 170 may calculate the third additional delay time based on the audio processing time information of the audio output device 185, and may output the third audio signal based on the calculated third additional delay time.

[0258] Next, the audio output device 185 may output a third sound corresponding to the third audio signal (S880).

[0259] Furthermore, the first additional delay time of the first sound in operation 850 (S850) may be greater than or equal to the third additional delay time of the third sound in operation 880 (S880). That is, the third additional delay time may be equal to or less than the first additional delay time.

[0260] For example, in a case where the third additional delay time is less than the first additional delay time, when the image display apparatus 100 outputs sound alone, the sound with less delay may be output.

[0261] Figure 8B is a flowchart illustrating an operating method of an image display device according to another embodiment of the present disclosure.

[0262] Referring to the drawing, when the sound output device 400 is turned on (S805), the interface 550 of the sound output device 400 may transmit audio format information of the sound output device 400 or audio processing time information Sd of the sound output device 400 (S810).

[0263] In response, the interface 130a in the image display apparatus 100 may receive audio format information of the sound output device 400 or audio processing time information Sd of the sound output device 400 (S815).

[0264] Then, the signal processing device 170 determines whether a simultaneous output mode in which the sound output device 400 and the audio output device 185 simultaneously output sounds is set (S820).

[0265] The signal processing device 170 may determine whether the simultaneous sound output mode is set when the setting screen is displayed.

[0266] If the simultaneous output mode is set, the signal processing device 170 may calculate a first additional delay time of the first audio signal and a second additional delay time of the second audio signal based on the audio format information of the sound output device 400 or the audio processing time information Sd of the sound output device 400 (S830).

[0267] Subsequently, the signal processing device 170 may output a first audio signal to the audio output device 185 based on the calculated first additional delay time (S842).

[0268] Next, the signal processing device 170 may output a second audio signal for the sound output device 400 based on the calculated second additional delay time, and the interface 130a in the image display apparatus 100 may transmit the second audio signal (S844).

[0269] In response, the interface 550 of the sound output device 400 may receive a second audio signal based on the second additional delay time (S845), and the audio output device 560 of the sound output device 400 may output a second sound corresponding to the second audio signal (S855).

[0270] In addition, the audio output device 185 of the image display apparatus 100 may output a first sound corresponding to the first audio signal based on the first additional delay time (S850).

[0271] As the first sound having the adjusted delay time is output from the audio output device 185 of the image display apparatus 100 together with the second sound output from the sound output device 400, sound synchronization may be performed in the case where the sound output device 400 and the image display apparatus simultaneously output sounds.

[0272] Fig.9A is a diagram showing an example of a sound setting screen.

[0273] Referring to the drawing, the signal processing device 170 may perform control to display a sound setting screen 910 based on an input signal of the remote controller 200 or the like.

[0274] The sound setting screen 910 may include a sound mode setting item, an output speaker selection item 915 , a synchronization adjustment item, and the like.

[0275] If the output speaker selection item 915 is selected, the signal processing device 170 may perform control to display an item 920 for simultaneous sound output, an item 925 for outputting sound only from the image display device, and an item 928 for outputting sound only from the sound output device, such as Fig. 9Bshown.

[0276] If the item 920 for simultaneous output is selected, the signal processing device 170 may be configured to execute a simultaneous output mode.

[0277] If the item 925 for outputting the sound only from the image display device is selected, the signal processing device 170 may be configured to perform a single sound output mode in which the audio output device 185 outputs the sound alone.

[0278] Furthermore, if the item 928 for outputting the sound only from the sound output device is selected, the signal processing device 170 may be configured to perform a single sound output mode in which the sound output device outputs the sound alone.

[0279] Fig. 10A is a diagram showing an example of receiving audio format information or audio processing time information from the sound output device 400 .

[0280] Referring to the drawing, after the sound output device 400 is turned on, the signal processing device 170 of the image display apparatus 100 may receive table information 1010a including a plurality of audio formats and audio processing time information corresponding to the plurality of audio formats.

[0281] Alternatively, after the sound output device 400 is turned on, the signal processing device 170 of the image display apparatus 100 may receive the first audio format information of the corresponding sound output device and the audio processing time information 1012a corresponding to the first audio format information.

[0282] Alternatively, after the sound output device 400 is turned on, the signal processing device 170 of the image display apparatus 100 may receive table information 1010 b including a plurality of audio formats.

[0283] Alternatively, after the sound output device 400 is turned on, the signal processing device 170 of the image display apparatus 100 may receive the first audio format information 1012b of the corresponding sound output device.

[0284] Therefore, based on the first audio format information 1012b of the corresponding sound output device, the signal processing device 170 of the image display apparatus 100 may access the external server 600, etc. to receive audio processing time information corresponding to the first audio format information 1012b of the corresponding sound output device.

[0285] Alternatively, after the sound output device 400 is turned on, the signal processing device 170 of the image display apparatus 100 may receive table information 1010c including audio processing time information corresponding to a plurality of audio formats.

[0286] Alternatively, after the sound output device 400 is turned on, the signal processing device 170 of the image display apparatus 100 may receive audio processing time information 1012c corresponding to the first audio format.

[0287] Fig. 10B is a diagram showing an example of the simultaneous output mode.

[0288] 1. Referring to the drawings, when displaying a broadcast video 1005, the signal processing device 170 may calculate a first additional delay time DDa based on audio format information or audio processing time information of the sound output device 400, and may output a first audio signal Stv based on the calculated first additional delay time DDa.

[0289] Therefore, the audio output device 185 in the image display apparatus 100 outputs the first sound Soa corresponding to the first audio signal based on the first additional delay time DDa.

[0290] Furthermore, when displaying the broadcast video 1005 , the signal processing device 170 may calculate the second additional delay time DDb based on the audio format information or the audio processing time information of the sound output device 400 , and may output the second audio signal Sau based on the calculated second additional delay time DDb.

[0291] Furthermore, the sound output device 400 outputs a second sound Sob based on the second audio signal Sau from the signal processing device 170 .

[0292] For example, in the simultaneous output mode, if the video processing time of the input video signal in the video driver 609 is 100ms, the audio processing time of the PCM audio signal in the audio driver 607 is 10ms, the audio processing time of the PCM audio signal in the sound output device 400 is 70ms, and the output processing time of the sound output device 400 is 20ms, the video processing time has a maximum delay, so that the total delay can be set to 100ms, the first additional delay time can be set to 90ms, i.e. 100ms-10ms, and the second additional delay time can be set to 10ms, i.e. 100ms-(70ms+20ms).

[0293] That is, the second additional delay time may be smaller than the first additional delay time. Therefore, the sound synchronized with the video signal may be output from the audio output device 185 and the sound output device 400.

[0294] Fig. 10C is a diagram showing an example of a single sound output mode in which the image display device outputs sound alone.

[0295] Referring to the accompanying drawings, in a monaural output mode in which the image display device outputs sound alone when displaying a broadcast video 1005, the signal processing device 170 can calculate a third additional delay time DDc of a third audio signal based on a video processing time of the input video signal while ignoring the audio format information or audio processing time information of the sound output device 400, and can output a third audio signal Stt based on the calculated third additional delay time DDc.

[0296] Therefore, the audio output device 185 in the image display apparatus 100 outputs the third sound Soa2 corresponding to the third audio signal Stt.

[0297] In addition, the sound output device 400 does not output sound.

[0298] For example, if the video processing time of the input video signal in the video driver 609 is 100 ms and the audio processing time of the PCM audio signal in the audio driver 607 is 10 ms, the signal processing device 170 may calculate 90 ms (ie, the time difference) as the third additional delay time.

[0299] In addition, when the broadcast video 1005 is displayed on the display 180, the signal processing device 170 can perform control so that the first additional delay time DDa of the first sound Soa based on the first audio signal STv output from the audio output device 185 can be greater than or equal to the third additional delay time DDc of the third sound Soa2 based on the third audio signal Stt output from the audio output device 185.

[0300] and Fig. 10B and Fig. 10C compared to, Fig. 10B The first additional delay time DDa (i.e. 90ms) can be equal to Fig. 10C The third additional delay time DDc (i.e. 90ms).

[0301] Fig. 10D 1 is a diagram showing an example of a single sound output mode in which a sound output device outputs sound alone.

[0302] Referring to the drawings, in a single sound output mode in which the sound output device 400 outputs sound alone while displaying a broadcast video 1005 , the signal processing device 170 may output an audio signal to the sound output device 400 without outputting an audio signal to the audio output device 185 .

[0303] Therefore, the audio output device 185 in the image display apparatus 100 does not output sound, and the sound output device 400 may output the fourth sound Sob2 alone as the only sound output.

[0304] In the monaural output mode in which the sound output device 400 outputs sound alone, the signal processing device 170 may calculate a fourth additional delay time DDd based on the video processing time of the input video signal in the video driver 609, the audio processing time in the sound output device 400, and the time for output processing of the sound output device 400, and may output a fourth audio signal based on the fourth additional delay time DDd to the sound output device 400.

[0305] Furthermore, the fourth additional delay time DDd may be equal to the second additional delay time DDb.

[0306] Fig.11A is a diagram showing another example of a single sound output mode in which the image display apparatus outputs sound alone.

[0307] Referring to the accompanying drawings, in a monaural output mode in which the image display device outputs sound alone when displaying a movie video 1105, the signal processing device 170 can calculate a third additional delay time DDe based on the video processing time information of the input video signal and the audio processing time information of the audio output device 185, while ignoring the audio format information or audio processing time information of the sound output device 400, and can output a third audio signal Stt based on the calculated additional delay time DDe.

[0308] For example, if the video processing time of the input video signal in the video driver 609 is 100 ms and the audio processing time of the DTS audio signal in the audio driver 607 is 20 ms, the signal processing device 170 may calculate 80 ms (ie, the time difference) as the third additional delay time DDe.

[0309] Therefore, the audio output device 185 in the image display apparatus 100 outputs the third sound Sot1 corresponding to the third audio signal Stt based on the third additional delay time DDe. In addition, the sound output device 400 does not output a sound.

[0310] Fig. 11B is a diagram showing an example of the simultaneous output mode.

[0311] Referring to the accompanying drawings, in the simultaneous sound output mode, the signal processing device 170 can calculate the first additional delay time DDf of the first audio signal Stv and the second additional delay time DDg of the second audio signal Sau based on the video processing time of the input video signal in the video driver 609, the audio processing time information Sd corresponding to the audio format information of the sound output device 400, the audio processing time in the audio driver 607, and the output processing time of the sound output device 400.

[0312] Therefore, the audio output device 185 in the image display apparatus 100 may output the first sound Soc2 corresponding to the first audio signal.

[0313] Furthermore, the sound output device 400 outputs the second sound Soc3 based on the second audio signal Sau from the signal processing device 170 .

[0314] For example, in the simultaneous sound output mode, if the video processing time of the input video signal in the video driver 609 is 100ms, the audio processing time of the DTS audio signal in the audio driver 607 is 20ms, the audio processing time of the DTS audio signal in the sound output device 400 is 120ms, and the time of the output processing of the sound output device 400 is 20ms, then it is not the video processing time but the sum of the delays of the sound output device 400 that has the maximum delay, so that the total delay can be set to 120ms+20ms=140ms, the additional delay time of the video can be set to 40ms, that is, 140ms-100ms, the first additional delay time can be set to 130ms, that is, 140ms-10ms, and the second additional delay time can be set to 0ms by considering 140ms. Therefore, the sound synchronized with the video signal can be output from the audio output device 185 and the sound output device 400.

[0315] That is, as shown in the figure, the output time of the first sound Soc2 is consistent with the delay time of the second sound Soc3. Therefore, when the image display apparatus 100 and the sound output device 400 output sounds at the same time, surround sound can be output.

[0316] also, Fig. 10B and Fig. 11B In comparison, the signal processing device 170 can perform control so that the additional delay time DDf of the first sound Soc2 based on the first audio signal output from the audio output device 185 when the movie video 1105 is displayed on the display 180 can be greater than the additional delay time DDa of the first sound based on the first audio signal output from the audio output device 185 when the broadcast video 1005 is displayed on the display 180.

[0317] As mentioned above, Fig. 11B The additional delay time DDf of the first sound Soc2 may be 130ms, ie, 140ms-10ms, and Fig. 10B The additional delay time DDa of the first sound Soa can be 90ms.

[0318] It is obvious that, although preferred embodiments have been shown and described above, the present disclosure is not limited to the above specific embodiments, and various modifications and changes may be made by those skilled in the art without departing from the gist of the appended claims. Therefore, it is intended that modifications and changes should not be understood independently of the technical spirit or prospect of the present disclosure.

Claims

1. An image display device, comprising: monitor; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; as well as a signal processing device, wherein in a simultaneous sound output mode of the sound output device and the audio output device, the signal processing device is configured to output a first audio signal based on a first additional delay time to the audio output device, and output a second audio signal based on a second additional delay time less than the first additional delay time to the sound output device, and in a single sound output mode of the audio output device, the signal processing device is configured to output a third audio signal to the audio output device, The first additional delay time of the first sound based on the first audio signal output from the audio output device is greater than or equal to the additional delay time of the third sound based on the third audio signal output from the audio output device.

2. The image display device according to 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 audio format information or audio processing time information of the sound output device.

3. The image display device according to claim 1, wherein: The interface is configured to receive audio format information or audio processing time information from the sound output device, Wherein, in the simultaneous 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.

4. The image display device according to 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 and audio format information or audio processing time information of the sound output device.

5. The image display device according to 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 the video processing time information of the input video signal, the output time information of the sound output device, and the audio format information or audio processing time information of the sound output device.

6. The image display device according to claim 5, wherein: As the level of the output time information of the sound output device increases, or the level of the audio processing time information of the audio driver decreases, or the 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.

7. The image display device according to claim 1, wherein: After the sound output device is turned on, the interface is configured to receive audio format information or audio processing time information of the sound output device through the first transmission line, Wherein, in the simultaneous sound output mode, the interface is configured to send the second audio signal to the sound output device through a second transmission line.

8. The image display device according to claim 1, wherein: In a case where 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 outputs sound alone.

9. The image display device according to claim 1, wherein: When displaying the broadcast video on the display, the signal processing device is configured to control the first additional delay time of the first sound based on the first audio signal output from the audio output device to be greater than or equal to the additional delay time of the third sound based on the third audio signal output from the audio output device.

10. The image display device according to claim 1, wherein: The signal processing device is configured to control the first additional delay time of the first sound based on the first audio signal output from the audio output device when a movie video is displayed on the display to be greater than the first additional delay time of the first sound based on the first audio signal output from the audio output device when a broadcast video is displayed on the display.

11. An image display device, comprising: monitor; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; as well as A signal processing device, in a simultaneous sound output mode of the sound output device and the audio output device, the signal processing device is configured to calculate a first additional delay time based on audio format information or audio processing time information of the sound output device, so as to output a first audio signal based on the calculated first additional delay time to the audio output device, and to output a second audio signal based on a second additional delay time to the sound output device, wherein the second additional delay time is lower in level than the first additional delay time.

12. The image display device according to claim 11, 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 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.

13. The image display device according to claim 11, 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 and the audio format information or the audio processing time information of the sound output device.

14. The image display device according to claim 11, 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, the output time information of the sound output device, and the audio format information or the audio processing time information of the sound output device.

15. The image display device according to claim 14, wherein: As the level of the output time information of the sound output device increases, or the level of the audio processing time information of the audio driver decreases, or the 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.

16. An image display device, comprising: monitor; an audio output device configured to output sound; an interface configured to exchange data with an external sound output device; as well as a signal processing device, wherein in a simultaneous sound output mode of the sound output device and the audio output device, the signal processing device is configured to output a first audio signal based on a first additional delay time to the audio output device, and output a second audio signal based on a second additional delay time to the sound output device, the second additional delay time being lower in level than the first additional delay time, Wherein, the interface is configured as: After the sound output device is turned on, receiving audio format information or audio processing time information of the sound output device through a first transmission line; and In the simultaneous sound output mode, the second audio signal is sent to the sound output device through a second transmission line.

17. The image display device according to claim 16, 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 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.

18. The image display device according to claim 16, 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 and the audio format information or the audio processing time information of the sound output device.

19. The image display device according to claim 16, 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, the output time information of the sound output device, and the audio format information or the audio processing time information of the sound output device.

Images