Image display apparatus

Abstract

An image display apparatus is disclosed. An image display device according to an embodiment of the present disclosure includes: a display; an audio output device; an interface that exchanges data with an external sound output device in a wired manner; a wireless communication device that wirelessly exchanges data with an external sound output device; and a signal processing device that outputs a first audio signal to the audio output device and wirelessly transmits a second audio signal based on the first format in a simultaneous output mode and in a mode in which wireless transmission is performed to the external sound output device, and wirelessly transmitting the audio signal based on the second format in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value. Accordingly, it is possible to stably output sound through an external sound output device wirelessly connected to the image display apparatus.

Description

Technical Field

[0001] The present invention relates to an image display apparatus, and more particularly, to an image display apparatus in which a wirelessly connected external sound output device can stably output sound. 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 full, rich sound, the output power required for image display devices to output sound has increased, and the use of separate sound output devices has also increased.

[0005] However, in the case where the external sound output device is connected to the image display apparatus by wire, there is an inconvenience in that installation is limited due to the wire cable or the like. Summary of the invention

[0006] An object of the present disclosure is to provide an image display apparatus in which a wirelessly connected external sound output device can stably output sound.

[0007] Another object of the present disclosure is to provide an image display apparatus in which an external sound output device and an image display apparatus which are wirelessly connected can output sound at the same time.

[0008] Still another object of the present disclosure is to provide an image display apparatus capable of transmitting a signal to an external sound output device in a wired or wireless manner.

[0009] To achieve the above and other objectives, 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 in a wired manner; a wireless communication device configured to exchange data with the external sound output device in a wireless manner; and a signal processing device configured to: in a simultaneous sound output mode of the external sound output device and the audio output device and in a mode of wireless transmission to the external sound output device, output a first audio signal to the audio output device, and wirelessly transmit a second audio signal based on a first format to the external sound output device, and in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, wirelessly transmit an audio signal based on a second format to the external sound output device.

[0010] In addition, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, the signal processing device may be configured to wirelessly transmit an audio signal in a second format based on a wireless data transmission rate lower than the first format to the external sound output device.

[0011] Furthermore, when outputting the audio signal based on the second format, the signal processing device may be configured to output the audio signal based on the first format to the audio output device.

[0012] Furthermore, when outputting the audio signal based on the second format, the signal processing device may be configured to output the audio signal based on the second format to the audio output device.

[0013] In addition, in a simultaneous output mode of an external sound output device and an audio output device and in a mode of wireless transmission to an external sound output device, the signal processing device may be configured to output a first audio signal based on a first format to the audio output device and to wirelessly transmit a second audio signal based on the first format to the external sound output device, wherein in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, the signal processing device may be configured to output a third audio signal based on a second format to the audio output device and to wirelessly transmit a fourth audio signal based on the second format to the external sound output device.

[0014] Furthermore, in a mono output mode of the image display apparatus, the signal processing device may be configured to output a fifth audio signal, and the audio output device may be configured to output a sound corresponding to the fifth audio signal.

[0015] In addition, in a monaural output mode of an external sound output device and in a mode of wireless transmission to an external sound output device, the signal processing device may be configured to wirelessly transmit an audio signal based on a third format to the external sound output device, the third format having a higher wireless data transmission rate than the first format.

[0016] Furthermore, in a monaural output mode of the external sound output device and in a wireless transmission mode to the external sound output device, the signal processing device may be configured to wirelessly transmit an audio signal based on the first format to the external sound output device.

[0017] In addition, in a monaural output mode of an external sound output device and in a mode of wireless transmission to an external sound output device, the signal processing device may be configured to wirelessly transmit an audio signal based on a third format to the external sound output device, wherein, in response to a number of retransmission requests from the external sound output device being greater than or equal to a reference value or a second reference value, the signal processing device may be configured to wirelessly transmit an audio signal based on a fourth format to the external sound output device.

[0018] In addition, after sending an audio signal based on the fourth format, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value or an allowed value, the signal processing device can be configured to switch the wireless transmission mode to the external sound output device to the wired transmission mode, and send the audio signal to the external sound output device via wire.

[0019] Furthermore, in the mode of wireless transmission to the external sound output device, the signal processing device may be configured to wirelessly transmit to the external sound output device an audio signal based on an audio format processable by the external sound output device.

[0020] In addition, the signal processing device can be configured to: receive audio format information that can be processed by the external sound output device from the external sound output device, and can be configured to wirelessly send an audio signal based on the following audio format to the external sound output device, where the audio format is selected from the received audio format information based on the environment of the wireless connection with the external sound output device.

[0021] Furthermore, the interface may be configured to receive audio format information processable by the external sound output device from the external sound output device, and transmit the received audio format information to the signal processing device.

[0022] In addition, after sending an audio signal based on the second format, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value or an allowed value, the signal processing device can be configured to switch the wireless transmission mode to the external sound output device to the wired transmission mode, and send the audio signal to the external sound output device via wire.

[0023] In addition, the signal processing device can be configured to control a first delay added to the first audio signal in a simultaneous output mode of the external sound output device and the audio output device and in a wireless transmission mode to the external sound output device to be greater than a second delay added to the first audio signal in a simultaneous output mode of the external sound output device and the audio output device and in a wired transmission mode for wired transmission to the external sound output device.

[0024] Furthermore, based on the content displayed on the display, the signal processing device may be configured to change the format of the audio signal wirelessly transmitted to the external sound output device.

[0025] 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 in a wired manner; a wireless communication device configured to exchange data with the external sound output device in a wireless manner; and a signal processing device configured to: in a mode of wireless transmission to the external sound output device, wirelessly transmit an audio signal based on a first format to the external sound output device, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, wirelessly transmit an audio signal based on a second format to the external sound output device, and after transmitting the audio signal based on the second format, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value or an allowed value, switch the mode of wireless transmission to the external sound output device to a wired transmission mode, and transmit the audio signal to the external sound output device via a wire.

[0026] In addition, the interface can be configured to receive audio format information that can be processed by the external sound output device from the external sound output device, and send the received audio format information to the signal processing device, wherein the signal processing device is configured to wirelessly send an audio signal based on the following audio format to the external sound output device, and the audio format is selected from the received audio format information based on the environment of the wireless connection with the external sound output device.

[0027] In addition, the signal processing device can be configured to control a first delay added to an audio signal sent to the audio output device in a simultaneous output mode of the external sound output device and the audio output device and in a wireless transmission mode to the external sound output device, so as to be greater than a second delay added to the audio signal sent to the audio output device in a simultaneous output mode of the external sound output device and the audio output device and in a wired transmission mode of wired transmission to the external sound output device.

[0028] Furthermore, based on the content displayed on the display, the signal processing device is configured to change the format of the audio signal wirelessly transmitted to the external sound output device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a diagram illustrating an image display system according to an embodiment of the present disclosure;

[0030] Figure 2 yes Figure 1 An exemplary internal block diagram of an image display device;

[0031] Figure 3 yes Figure 2 An example of an internal block diagram of a signal processing device;

[0032] Figure 4A is an example of a control Figure 2 A diagram of a method of remote control as shown in ;

[0033] Figure 4B yes Figure 2 The internal block diagram of the remote control shown;

[0034] Figure 5 yes Figure 1 An internal block diagram of an external sound output device;

[0035] Figure 6 is an exemplary internal block diagram of an image display device according to an embodiment of the present disclosure;

[0036] FIG. 7A to FIG. 7B is Figure 6 Figures involved in the description;

[0037] Fig. 8A is a flowchart illustrating an operation method of an image display device according to an embodiment of the present disclosure;

[0038] Figure 8B is a flowchart illustrating an operating method of an image display device according to another embodiment of the present disclosure; and

[0039] 9A to 13B is Fig. 8A and Figure 8B The figures involved in the description. DETAILED DESCRIPTION

[0040] Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings.

[0041] Regarding the constituent elements used in the following description, the suffixes "module" and "unit" are given only for the convenience of preparing the specification, and do not have or serve as different meanings. Therefore, the suffixes "module" and "unit" can be used interchangeably.

[0042] Figure 1 is a diagram illustrating an image display system according to an embodiment of the present disclosure.

[0043] 1 , the image display system 10 according to an embodiment of the present disclosure may include an external sound output device 400 and an image display apparatus 100 including a display 180 .

[0044] The image display system 10 may include a set-top box 300 , an external sound output device 400 , and a server 600 .

[0045] 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 .

[0046] For example, the image display apparatus 100 may receive an image signal from the set-top box 300 through an HDMI terminal.

[0047] 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.

[0048] 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.

[0049] 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 (see Figure 2 ), which is configured to output sound; interface 130a (see Figure 6 ), which is configured to exchange data with the external sound output device 400 in a wired manner; the wireless communication device 135a (see Figure 6 ), which is configured to exchange data with the external sound output device 400 in a wireless manner; and the signal processing device 170 (see Figure 2 ), which, in a simultaneous sound output mode of the external sound output device 400 and the audio output device 185 and in a mode of wireless transmission to the external sound output device 400, is configured to output a first audio signal to the audio output device 185, and wirelessly transmit a second audio signal based on the first format to the external sound output device 400, and in response to the number of retransmission requests from the external sound output device 400 being greater than or equal to a reference value, wirelessly transmit an audio signal based on the second format to the external sound output device 400.

[0050] Therefore, the wirelessly connected external sound output device 400 can stably output sound. Specifically, the wirelessly connected external sound output device 400 and the image display apparatus 100 can output sound at the same time.

[0051] 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.

[0052] also, Figure 1 The illustrated image display apparatus 100 may be a TV, a monitor, a tablet PC, a mobile device, or the like.

[0053] Figure 2 yes Figure 1 The image shown is a block diagram of a display device.

[0054] Reference Figure 2The image display device 100 according to the 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 (see FIG. 12A to FIG. 12C ), signal processing device 170, display 180 and audio output device 185.

[0055] The image receiver 105 may include a tuner device 110 , a demodulator 120 , a network interface 135 , and an external device interface 130 .

[0056] 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.

[0057] The tuner device 110 selects a RF broadcast signal corresponding to a channel selected by a user or an RF broadcast signal corresponding to each pre-stored channel from among a plurality of radio frequency (RF) broadcast signals received through an antenna (not shown). In addition, the tuner device 110 down-converts the selected RF broadcast signal into an intermediate frequency (IF) signal or a baseband audio / video (A / V) signal.

[0058] 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.

[0059] 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.

[0060] The demodulator 120 receives the digital IF signal from the tuner device 110 and demodulates the digital IF signal.

[0061] 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.

[0062] The stream signal output from the demodulator 120 may be input to the signal processing device 170 and then be demultiplexed and A / V signal processed. The signal processing device 170 outputs the processed video and audio signals to the display 180 and the audio output device 185, respectively.

[0063] The external device interface 130 can send data to an external device (not shown) connected thereto (such as a set-top box) and receive data from an external device (not shown) connected thereto (such as a set-top box). For this purpose, the external device interface 130 may include an A / V input / output (I / O) device (not shown).

[0064] The external device interface 130 may be wirelessly or wiredly connected to an external device such as a digital versatile disc (DVD) player, a Blu-ray disc (BD) player, a game console, a camera, a camcorder, a computer (e.g., a laptop), or a set-top box. The external device interface 130 may then transmit and receive signals to and from the external device.

[0065] 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.

[0066] The external device interface 130 may exchange data with the nearby mobile terminal 600 through a wireless communicator (not shown). Specifically, the external device interface 130 may receive device information, executed application information, application images, etc. from the mobile terminal 600 in a mirroring mode.

[0067] 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) via a network.

[0068] Additionally, network interface 135 may include a wireless communicator (not shown).

[0069] The memory 140 may store programs required for the signal processing device 170 to process signals and control, and may also store signal-processed image, audio, or data signals.

[0070] In addition, the memory 140 may also temporarily store audio, video or data signals received from the external device interface 130. The memory 140 may store information on broadcast channels through a channel adding function.

[0071] Although Figure 2The memory 140 shown in FIG. 1 is configured to be separate from the signal processing device 170 , but the present disclosure is not limited thereto, and the memory 140 may be incorporated in the signal processing device 170 .

[0072] 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.

[0073] For example, the user input interface 150 can send / receive user input signals such as a power on / off signal, a channel selection signal, a screen setting signal, etc. to / from the remote controller 200, can provide the signal processing device 170 with user input signals received from local keys (not shown), such as inputs of a power key, a channel key, a volume key, a setting value, etc., and can provide the signal processing device 170 with user input signals received from sensor devices (see FIG. 12A to FIG. 12C ) receives a user input signal for sensing a user gesture and sends it to the signal processing device 170, or sends a signal received from the signal processing device 170 to a sensor device (see FIG. 12A to FIG. 12C ).

[0074] 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.

[0075] For example, the signal processing device 170 may receive a broadcast signal or an HDMI signal received by the image receiver 105 , and output a processed image signal by processing the received broadcast signal or the received HDMI signal.

[0076] 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.

[0077] The audio signal processed by the signal processing device 170 may be output to the audio output device 185. In addition, the audio signal processed by the signal processing device 170 may be transmitted to an external output device through the external device interface 130.

[0078] although Figure 2 , but the signal processing device 170 may include 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 A more detailed description is given.

[0079] In addition, the signal processing device 170 may provide overall control of 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.

[0080] 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.

[0081] 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.

[0082] 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 link 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.

[0083] 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.

[0084] 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 .

[0085] Furthermore, the display 180 may also be a touch screen, which may be used not only as an output device but also as an input device.

[0086] 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.

[0087] 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.

[0088] The signal processing device 170 may process the captured image received from the camera device (not shown) or the captured image received from the sensor device (see FIG. FIG. 12A to FIG. 12C) receives the signal and senses the user's posture.

[0089] The power supply 190 supplies power to the entire image display apparatus 100. Specifically, the power supply 190 may supply power to the signal processing device 170 which may be implemented as a system on chip (SOC), the display 180 for displaying an image, the audio output device 185 for outputting an audio signal, and the like.

[0090] 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.

[0091] The remote controller 200 transmits the user input to the user input interface 150. For the transmission of 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 output the received signal as an image or sound.

[0092] The above-mentioned image display device 100 may be a fixed or mobile digital broadcast receiver.

[0093] also, Figure 2 The block diagram of the image display device 100 shown is a block diagram of an embodiment of the present disclosure. According to the specifications of the image display device 100 actually implemented, each component of the block diagram can be integrated, added or omitted. 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. The functions performed in each block are described for the purpose of illustrating the embodiments of the present disclosure, and the specific operations and devices do not limit the scope of the present disclosure.

[0094] Figure 3 yes Figure 2 A block diagram of a signal processing device is shown.

[0095] Reference 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).

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 .

[0100] 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.

[0101] The scaler 335 may scale the received image signal decoded by the video decoder 325 .

[0102] 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.

[0103] The image quality processor 635 may perform image quality processing based on the received image signal decoded by the video decoder 325 .

[0104] For example, the image quality processor 635 can reduce the noise of the received image signal, expand the resolution of the grayscale of the received image signal, enhance the image resolution, perform signal processing based on high dynamic range (HDR), change the frame rate, or perform image quality processing corresponding to the panel characteristics.

[0105] 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 for displaying various information as graphics or text on the display 180 according to a user input signal. 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.

[0106] 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 by a pointing signal processing device (not shown) which may be provided in the OSD processor 340. Obviously, the pointing signal processing device may be constructed separately from the OSD processor 240.

[0107] The FRC 350 may change the frame rate of a received image signal, or simply output the image signal without frame rate conversion.

[0108] The formatter 360 may change the format of the received image signal into an image signal to be displayed on a display.

[0109] Specifically, the formatter 360 may change the format of the received image signal to correspond to the characteristics of the display panel.

[0110] 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 into one of various 3D formats such as a side-by-side format, a top / down format, a frame sequential format, an interlaced format, and a checkerboard format.

[0111] The processor 330 may control overall operations in the image display apparatus 100 or the signal processing device 170 .

[0112] For example, the processor 330 may control the tuner device 110 to tune to an RF broadcast signal corresponding to a user-selected channel or a pre-stored channel.

[0113] 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.

[0114] In addition, the processor 330 may control data transmission through the network interface 135 or the external device interface 130 .

[0115] In addition, the processor 330 may control operations of the DEMUX 310 and the image processor 320 in the signal processing device 170 .

[0116] 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.

[0117] The audio processor 370 of the signal processing device 170 may also adjust the bass, treble, and volume of the audio signal.

[0118] 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 the scheduled broadcast program of each channel.

[0119] also, Figure 3 The block diagram of the signal processing device 170 shown is only an example. Depending on the detailed description of the signal processing device 170 in actual implementation, the components of the signal processing device 170 may be combined or omitted, or new components may be added.

[0120] Specifically, the FRC 350 and the formatter 360 may be provided separately from the image processor 320 .

[0121] Figure 4A is an example of a control Figure 2 FIG. 10 shows a method of using a remote controller.

[0122] Figure 4A (a) illustrates a pointer 205 representing the movement of the remote controller 200 displayed on the display 180 .

[0123] 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.

[0124] Reference 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.

[0125] The sensor of the remote controller 200 detects the movement of the remote controller 200 and transmits motion 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 motion information of the remote controller 200. Then, the image display device displays the pointer 205 at the calculated coordinates.

[0126] Reference 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 enlarged and expanded 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 is moved away from the display 180, the selected area may be reduced, and when the remote controller 200 approaches the display 180, the selected area may be enlarged.

[0127] 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 moves away from the display 180 or approaches the display 180, only the front and rear 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, or right movement of the remote controller 200.

[0128] The speed and direction of the pointer 205 may correspond to the speed and direction of the remote controller 200 .

[0129] Figure 4B yes Figure 2 Block diagram of the remote control shown in .

[0130] Reference 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 .

[0131] The wireless communicator 425 sends a signal to and / or receives a signal from one of the image display devices according to an embodiment of the present disclosure. One of the image display devices according to an embodiment of the present disclosure (ie, the image display device 100) will be taken as an example.

[0132] In this embodiment, the remote controller 200 may include an RF module 421 for transmitting 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 transmitting 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.

[0133] 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 .

[0134] 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.

[0135] The user input device 435 may include a keyboard, 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 hard key buttons, the user may input various commands to the image display device 100 by pressing the hard key buttons. If the user input device 435 includes a touch screen displaying a plurality of soft keys, the user may input various commands to the image display device 100 by touching the soft keys. The user input device 435 may also include various input tools other than those mentioned herein, such as a scroll key and / or a jog key, and the user input device 435 should not be interpreted as limiting the present disclosure.

[0136] The sensor device 440 may include a gyro sensor 441 and / or an acceleration sensor 443. The gyro sensor 441 may sense the motion of the remote controller 200.

[0137] For example, the gyro sensor 441 may sense motion information of the remote controller 200 in the X, Y, 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.

[0138] The output device 450 may output a video and / or audio signal corresponding to the operation 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 whether the image display apparatus 100 has been controlled, based on the video and / or audio signal output from the output device 450.

[0139] For example, output device 450 may include: LED module 451, which turns on or off whenever user input device 435 is manipulated or whenever a signal is received from or sent to image display device 100 through wireless communicator 425; vibration module 453, which generates vibration; audio output module 455, which outputs audio data; or display module 457, which outputs an image.

[0140] 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 to save power. If a specific key on the remote controller 200 is manipulated, the power supply 460 may resume the power supply.

[0141] 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 the paired image display device 100 in the memory 470, and may then refer to this information for later use.

[0142] Controller 480 performs overall control of remote controller 200. For example, controller 480 may transmit a signal corresponding to a key operation detected from user input device 435 or a signal corresponding to a movement of remote controller 200 as sensed by sensor device 440 to image display apparatus 100 through wireless communicator 425.

[0143] The user input interface 150 of the image display device 100 may include: a wireless communication module 411, which wirelessly sends signals to the remote control 200 and / or wirelessly receives signals from the remote control 200; and a coordinate calculator 415, which calculates the coordinates of the position of the remote control 200 on the display screen to be moved according to the movement of the remote control 200.

[0144] 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.

[0145] The coordinate calculator 415 may receive motion information about the movement of the remote controller 200 through the wireless communication module 411, and 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 shaking.

[0146] 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 operation detected from the remote controller 200 according to the signal received from the remote controller 200, and may control the image display device 100 based on the acquired information.

[0147] In another example, the remote controller 200 may calculate the coordinates of the position to which the pointer is to be offset 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 shaking to the signal processing device 170.

[0148] In yet another example, Figure 4B The configuration of the remote controller 200 shown in FIG. 1 is different, and the coordinate calculator 415 may be provided in the signal processing device 170 instead of the user input interface 150 .

[0149] Figure 5 It is an example Figure 1 Internal block diagram of an external sound output device.

[0150] Referring to the drawings, the external 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 device 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.

[0151] 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.

[0152] The sensor 530 may output motion information of the external sound output device 400 , for example, motion information (acceleration information, angular velocity information) or position information about x, y, and z axes, or the like.

[0153] In addition, the sensor 530 may sense temperature information or current information or voltage information of the external sound output device.

[0154] 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 353a and a second communication module 353b.

[0155] For example, the first communication module 353a in the communication device 535 may be a wireless communication module and may provide an interface for wireless data communication, such as Bluetooth.

[0156] For example, the second communication module 353 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, and the like.

[0157] The memory 540 may store a program for processing or control by the controller 570 in the external sound output device 400 and may also temporarily store input / output data.

[0158] For example, the memory 540 may store audio format information of the external sound output device 400 or audio processing time information of the external sound output device 400 .

[0159] The interface 550 may provide an interface for wired data communication, such as HDMI.

[0160] For example, the interface 550 may transmit audio format information of the external sound output device 400 or audio processing time information of the external sound output device 400 to the image display apparatus 100 .

[0161] The audio output device 560 may output sound based on the audio signal processed by the controller 570 of the external sound output device 400 .

[0162] The controller 570 may control the overall operation of the external sound output device 400 by controlling the operation of each component of the external sound output device 400 .

[0163] In addition, the controller 570 may perform signal processing on an audio signal received from an external source.

[0164] In addition, the controller 570 may reproduce an audio signal received from the first communication module 535a or the second communication module 535b.

[0165] In addition, the input device 585 may include a button for initializing the external sound output device 400 or an operation input button, etc.

[0166] Furthermore, the input device 585 may include a microphone 587 for sound collection.

[0167] Furthermore, the input device 585 may include a camera (not shown) for capturing images.

[0168] The power supply 590 may provide power required for the operation of each component under the control of the controller 570 .

[0169] Specifically, the power supply 590 may include a battery (not shown) that stores and outputs direct current.

[0170] Figure 6 is an exemplary internal block diagram of an image display device according to an embodiment of the present disclosure.

[0171] Reference Figure 6 The image display device 100 includes a display 180, an audio output device 185 configured to output sound, an interface 130a configured to exchange data with an external sound output device 400 in a wired manner, a wireless communication device 135a configured to exchange data with the external sound output device 400 in a wireless manner, and a signal processing device 170.

[0172] In addition, the wireless communication device 135 a may include a first communication module (not shown) corresponding to the first communication module 535 a in the external sound output device 400 .

[0173] In this case, the first communication module (not shown) in the wireless communication device 135a may provide an interface for wireless data communication, such as Bluetooth.

[0174] In addition, the wireless communication device 135 a may include a second communication module (not shown) corresponding to the second communication module 535 b in the external sound output device 400 .

[0175] In this case, the second communication module (not shown) in the wireless communication device 135a may provide an interface for wireless data communication, such as Wi-Fi or ultra-wideband (UWB) or the like.

[0176] In addition, the interface 130a may be an HDMI interface.

[0177] In addition, the interface 130 a may receive the audio format information Sd from the external sound output device 400 , or may receive the audio processing time information according to the audio format information Sd of the external sound output device 400 .

[0178] For example, the interface 130 a may receive audio format information Sd processable by the external sound output device 400 from the external sound output device 400 , and may transmit the received audio format information Sd to the signal processing device 170 .

[0179] In addition, the signal processing device 170 may receive audio format information Sd processable by the external sound output device 400 from the external sound output device 400, and may control an audio signal to the external sound output device 400 based on an audio format selected from among the received audio format information Sd based on an environment in which the external sound output device 400 is wirelessly connected to the signal processing device 170. Therefore, sound may be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0180] In addition, in the simultaneous sound output mode of the external sound output device 400 and the audio output device 185, and in the mode of wireless transmission to the external sound output device 400, the signal processing device 170 can output the first audio signal to the audio output device 185, and can be configured to wirelessly send a second audio signal based on the first format to the external sound output device 400, and if the number of times the external sound output device 400 requests retransmission is greater than or equal to a reference value, the signal processing device 170 can be configured to wirelessly send an audio signal based on the second format to the external sound output device 400.

[0181] Therefore, the sound can be stably output through the external sound output device 400 wirelessly connected to the image display apparatus. Specifically, the wirelessly connected external sound output device 400 and the image display apparatus 100 can output the sound at the same time.

[0182] In addition, if the number of times the external sound output device 400 requests retransmission is greater than or equal to a reference value, the signal processing device 170 may control the audio signal based on a second format to the external sound output device 400, wherein the second format has a wireless data transmission rate less than the first format.

[0183] For example, the first format may be a DTS format and the second format may be a two-channel PCM format.

[0184] In addition, when outputting the audio signal based on the second format, the signal processing device 170 may output the audio signal based on the first format to the audio output device 185. Therefore, the sound may be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0185] Alternatively, when outputting the audio signal based on the second format, the signal processing device 170 may output the audio signal based on the second format to the audio output device 185. Therefore, the sound may be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0186] In the simultaneous sound output mode of the external sound output device 400 and the audio output device 185, and in the mode of wireless transmission to the external sound output device 400, the signal processing device 170 may output a first audio signal based on a first format to the audio output device 185, and may be configured to wirelessly transmit a second audio signal based on the first format to the external sound output device 400, wherein if the number of times the external sound output device 400 requests retransmission is greater than or equal to a reference value, the signal processing device 170 may output a third audio signal based on a second format to the audio output device 185, and may be configured to output a fourth audio signal based on the second format to the external sound output device 400. Therefore, sound may be stably output through the external sound output device 400 wirelessly connected to the image display device. Specifically, the wirelessly connected external sound output device 400 and the image display device 100 may output sound simultaneously.

[0187] In this case, when transmitting the second audio signal based on the first format, the signal processing device 170 may be configured to wirelessly transmit the second audio signal to the external sound output device 400 by using the second communication module (not shown) in the wireless communication device 135a, and when transmitting the fourth audio signal based on the second format, the signal processing device 170 may be configured to wirelessly transmit the fourth audio signal to the external sound output device 400 by using the second communication module (not shown) having a smaller wireless communication bandwidth than the first communication module (not shown). Therefore, the sound can be stably output by the external sound output device 400 wirelessly connected to the image display device. Specifically, the wirelessly connected external sound output device 400 and the image display device 100 can output the sound at the same time.

[0188] In addition, in the mono output mode of the image display device 100, the signal processing device 170 may output the fifth audio signal, and the audio output device 185 may output the sound corresponding to the fifth audio signal. Therefore, only the image display device 100 may output the sound.

[0189] In addition, in the monaural output mode of the external sound output device 400 and in the wireless transmission mode to the external sound output device 400, the signal processing device 170 can control the audio signal based on the third format to the external sound output device 400, which has a wireless data transmission rate greater than the first format.

[0190] For example, the first format may be a DTS format and the third format may be a multi-channel PCM format.

[0191] In addition, in the monaural output mode of the external sound output device 400 and in the wireless transmission mode to the external sound output device 400 , the signal processing device 170 may wirelessly transmit the audio signal based on the first format to the external sound output device 400 .

[0192] In addition, in the monaural output mode of the external sound output device 400 and in the mode of wireless transmission to the external sound output device 400, the signal processing device 170 may wirelessly transmit an audio signal based on the third format to the external sound output device 400, and if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value or the second reference value, the signal processing device 170 may be configured to wirelessly transmit an audio signal based on the fourth format to the external sound output device 400.

[0193] In this case, if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value, the signal processing device 170 can control the audio signal based on the fourth format given to the external sound output device 400, the fourth format having a wireless data transmission rate lower than the third format.

[0194] For example, the third format may be a multi-channel PCM format, and the fourth format may be a Dolby Digital format or a two-channel PCM format.

[0195] In addition, after transmitting the audio signal based on the fourth format, if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value or the allowed value, the signal processing device 170 may switch the wireless transmission mode for wireless transmission to the external sound output device 400 to the wired transmission mode, and transmit the audio signal by wire to the external sound output device 400. Therefore, the sound can be stably output by the external sound output device 400 wirelessly connected to the image display apparatus.

[0196] In addition, in the wireless transmission mode or the wired transmission mode and in the simultaneous sound output mode of the external sound output device 400 and the audio output device 185, the signal processing device 170 can control the first audio signal Stv based on the first additional delay time to be output to the audio output device 185, and the second audio signal Sau based on the second additional delay time to be output to the external sound output device 400. Therefore, when the external sound output device 400 and the image display device 100 output sound at the same time, sound synchronization can be performed. Specifically, by using different additional delay times, when the external sound output device 400 and the image display device 100 output sound at the same time, sound synchronization can be performed.

[0197] Furthermore, in the monaural output mode of the audio output device 185 , the signal processing device 170 may output the fifth audio signal Stt to be output to the audio output device 185 .

[0198] For example, in the mono output mode of the audio output device 185, if the level of the video processing time information of the input video signal is greater than the level of the audio processing time information of the audio output device 185, the signal processing device 170 may control the fifth audio signal Stt based on the third additional delay time corresponding to the difference between the levels to be output 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.

[0199] In another example, in the mono output mode of the audio output device 185, if the level of the video processing time information of the input video signal is lower than the level of the audio processing time information of the audio output device 185, the signal processing device 170 may control the third additional delay time corresponding to the difference between the levels to be added to the video signal instead of the fifth audio signal Stt. Therefore, the additional delay time of the fifth audio signal Stt may be level 0, and thus when the image display device 100 outputs sound alone, sound with less delay may be output compared to the case of simultaneous output.

[0200] In addition, the signal processing device 170 may include: an interface controller 630, which is configured to control the interface 130a; and a delay controller 611, which is configured to calculate the delay time of the audio signal based on the audio format information Sd received from the interface 130a or the interface controller 630 or the audio processing time information of the external sound output device 400.

[0201] In addition, in the simultaneous output mode during the wireless transmission mode or the wired transmission 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.

[0202] 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.

[0203] 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.

[0204] 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 external sound output device 400 .

[0205] In addition, in the mono output mode, the first audio output driver 640 in the signal processing device 170 can output the third audio signal Stt to the audio output device 185 , where the third audio signal Stt is a full-band signal that has not passed through the low-pass filter 642 .

[0206] Therefore, in the monaural output mode, the third sound may be output as a full-band sound signal from the audio output device 185 .

[0207] 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 .

[0208] In addition, the audio signal Sao processed by the audio driver 607 may be input to the delay controller 611 .

[0209] In addition, the video signal Svo processed by the video driver 609 can be input to the delay controller 611.

[0210] In addition, the audio delay table 621 may output audio processing time information FDa of the audio driver 607 according to the audio format to the delay controller 611 .

[0211] In this case, the audio processing time information FDa of the audio driver 607 according to the audio format may correspond to the audio processing time information of the audio output device 185 .

[0212] In addition, the video delay table 623 may output video processing time information FDv of the video driver 609 according to the video format to the delay controller 611 .

[0213] In addition, in the simultaneous output mode during the wireless transmission mode or the wired transmission mode, the delay controller 611 in the signal processing device 170 can calculate the first additional delay time of the first audio signal Stv based on the audio format information Sd of the external sound output device 400 or the audio processing time information of the external sound output device 400.

[0214] 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 according to the audio format information of the external sound output device 400, the audio processing time in the audio driver 607, and the time of output processing to the external sound output device 400.

[0215] Specifically, in the simultaneous sound output mode, the delay controller 611 in the signal processing device 170 can control the first additional delay time of the first audio signal to increase as the video processing time of the input video signal in the video driver 609 increases, or as the audio processing time according to the audio format information of the external sound output device 400 increases, or as the audio processing time in the audio driver 607 decreases, or as the time of output processing to the external sound output device 400 increases.

[0216] In addition, in the simultaneous sound output mode, the delay controller 611 in the signal processing device 170 can control the second additional delay time of the second audio signal to increase as the video processing time of the input video signal in the video driver 609 increases, or to increase as the audio processing time according to the audio format information of the external sound output device 400 decreases, or to increase as the audio processing time in the audio driver 607 decreases, or to increase as the time of output processing to the external sound output device 400 decreases.

[0217] In addition, if the video processing time of the input video signal is greater than the delay sum of the external sound output device 400, the delay controller 611 in the signal processing device 170 can calculate the first additional delay time and the second additional delay time based on the video processing time of the output video signal.

[0218] 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 external sound output device 400.

[0219] In addition, if the sum of the delays of the external 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 external sound output device 400. Therefore, the sound synchronized with the video signal may be output from the audio output device 185 and the external sound output device 400.

[0220] In addition, in a monaural output mode during a wireless transmission mode or a wired transmission mode, the delay controller 611 in the signal processing device 170 may output a fifth audio signal based on the calculated third additional delay time while ignoring the audio format information Sd of the external sound output device 400 or the audio processing time information of the external sound output device 400.

[0221] 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 fifth audio signal based on the video processing time of the input video signal, while ignoring the audio format information Sd of the external sound output device 400 or the audio processing time information of the external sound output device 400.

[0222] 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 fifth 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 Sd of the external sound output device 400 or the audio processing time information of the external sound output device 400.

[0223] For example, in a 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 can calculate a third additional delay time for a fifth audio signal synchronized with the video signal.

[0224] 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 can control the third additional delay time to increase as the video processing time of the input video signal increases, or to increase as the audio processing time in the audio driver 607 decreases.

[0225] That is, in the mono output mode, the delay controller 611 in the signal processing device 170 can calculate the third additional delay time based on the audio processing time information of the audio output device 185, and can output a third audio signal based on the calculated third additional delay time.

[0226] In addition, if the external sound output device 400 is turned off during operation in the simultaneous sound output mode, the signal processing device 170 can switch to a single sound output mode in which only the audio output device 185 outputs sound. Therefore, it is possible to quickly switch from the simultaneous sound output mode to the single sound output mode.

[0227] Fig. 7A and Figure 7B is Figure 6 The figures involved in the description.

[0228] first, Fig. 7A and Figure 7B is a diagram illustrating an example of an interface scheme between an image display apparatus and an external sound output device.

[0229] Referring to the drawings, the image display apparatus 100 and the external sound output device 400 may perform HDMI communication which is a fixed line interface method.

[0230] 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 external sound output device 400 .

[0231] A plurality of transition minimized differential signaling (TMDS) lines Lna to Lnd, a display data channel (DDC) line Lne, a CEC line LNf, a common line LNg, and an HPD line LNh may be provided between the HDMI transmitter 132 and the HDMI receiver 462 .

[0232] In addition, after the external sound output device 400 is turned on, the interface 130a of the image display apparatus 100 may receive the audio format information Sd of the external sound output device 400 or the audio processing time information of the external sound output device 400 through the first transmission line LNf.

[0233] That is, the interface 130a of the image display apparatus 100 may receive the audio format information Sd of the external sound output device 400 or the audio processing time information of the external sound output device 400 through the CEC line LNf.

[0234] In addition, in the simultaneous sound output mode, the interface 130a of the image display device 100 can transmit the second audio signal Sau to the external sound output device 400 through the second transmission line LNa or LNb. Therefore, when the external sound output device 400 and the image display device 100 output sound at the same time, sound synchronization can be performed.

[0235] Figure 7B It is an example Fig. 7A Figure 4 shows the CEC data format of the CEC lines in Figure 4.

[0236] Referring to the drawing, a CEC data format 700 may include a plurality of information bits, EOM, and ACK.

[0237] according to Figure 7BAccording to the CEC data format 700 , the interface 550 of the external sound output device 400 may transmit the audio format information Sd of the external sound output device 400 or the audio processing time information of the external sound output device 400 .

[0238] Fig. 8A is a flowchart illustrating an operating method of an image display device according to an embodiment of the present disclosure.

[0239] 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 external sound output device 400 and the audio output device 185 are in a simultaneous sound output mode (S820).

[0240] The signal processing device 170 may determine whether the simultaneous output mode is set based on the input signal while displaying the setting screen.

[0241] Then, the signal processing device 170 determines whether the wireless transmission mode is set during the simultaneous voice output mode (S823).

[0242] The signal processing device 170 may determine whether the wireless transmission mode is set based on the input signal while the setting screen is displayed.

[0243] In addition, in the simultaneous sound output mode and in the mode of wireless transmission to the external sound output device 400, the signal processing device 170 may output the first audio signal and the second audio signal based on the first format by using the wireless network information (S840).

[0244] Of the two signals, the first audio signal based on the first format may be input to the audio output device 185 .

[0245] In addition, the second audio signal based on the first format may be input to the wireless communication device 135a to be transmitted to the wirelessly connected external sound output device 400 through the wireless communication device 135a (S842).

[0246] Furthermore, if the image display apparatus 100 and the external sound output device 400 are not wirelessly connected before operation 842 ( S842 ), the wireless communication device 135 a may be wirelessly paired with the external sound output device 400 .

[0247] In this case, the wireless communication device 135a may wirelessly receive information about a wireless channel between the wireless communication device 135a and the external sound output device 400, and may perform wireless pairing by selecting an optimal channel from the received wireless channel information.

[0248] Furthermore, after performing the wireless pairing or during the wireless pairing, the wireless communication device 135 a may receive audio format information 1010 processable by the external sound output device 400 from the external sound output device 400 .

[0249] In addition, the wireless communication device 135a receives a retransmission request for the second audio signal from the external sound output device 400, and determines whether the number of received retransmission requests is greater than or equal to a reference value (S844).

[0250] If the number of times the external sound output device 400 requests retransmission is less than the reference value, the wireless output device 135a may continuously output the first audio signal and the second audio signal based on the first format.

[0251] Then, the audio output device 185 receiving the first audio signal may output a sound corresponding to the first audio signal (S850).

[0252] At this time, the external sound output device 400 that wirelessly receives the second audio signal may output a sound corresponding to the second audio signal.

[0253] Therefore, the external sound output device 400 and the image display apparatus 100 may stably output sound at the same time in the wireless transmission mode.

[0254] In addition, in operation 844 (S844), if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value, the signal processing device 170 can output a third audio signal and a fourth audio signal based on a second format, wherein the second format has a wireless data transmission rate less than the first format (S852).

[0255] In this case, the first format may be a DTS format, and the second format may be a multi-channel PCM format.

[0256] In addition, the fourth audio signal based on the second format may be input to the wireless communication device 135a to be transmitted to the wirelessly connected external sound output device 400 through the wireless communication device 135a (S854).

[0257] In addition, the third audio signal based on the second format may be input to the audio output device 185, and the fourth audio signal based on the second format may be input to the wireless communication device 135a to be transmitted to the wirelessly connected external sound output device 400 through the wireless communication device 135a.

[0258] In addition, the audio output device 185 receiving the third audio signal may output a sound corresponding to the third audio signal (S857).

[0259] Meanwhile, the external sound output device 400 receiving the fourth audio signal may output a sound corresponding to the fourth audio signal.

[0260] Therefore, the external sound output device 400 and the image display apparatus 100 may stably output sound at the same time in the wireless transmission mode.

[0261] In addition, after sending an audio signal based on the fourth format, if the number of times the external sound output device 400 requests retransmission is greater than or equal to a reference value or an allowed value, the signal processing device 170 may switch the wireless transmission mode to the external sound output device 400 to a wired transmission mode and send an audio signal to the external sound output device 400 via a wire.

[0262] In this case, the simultaneous sound output mode can be performed in the wired transmission mode. Therefore, the external sound output device 400 can stably output sound.

[0263] Furthermore, in operation 820 (S820), if the simultaneous sound output mode is not performed, the signal processing device 170 determines whether the single sound output mode of the image display apparatus 100 is set (S860).

[0264] Then, if the mono output mode of the image display apparatus 100 is set, the signal processing device 170 may output a fifth audio signal (S870).

[0265] The fifth audio signal may be input to the audio output device 185, and the audio output device 185 may output a sound corresponding to the fifth audio signal (S880). Therefore, only the image display apparatus 100 may output the sound.

[0266] Furthermore, the fifth audio signal may have a format different from the first format.

[0267] Furthermore, unlike the drawing, the signal processing device 170 may also determine whether the mono output mode of the external sound output device 400 is set.

[0268] The signal processing device 170 determines whether the monaural output mode of the external sound output device 400 and the mode of wireless transmission to the external sound output device 400 are set, and if so, the signal processing device 170 can control the audio signal based on the third format to the external sound output device 400, the third format having a wireless data transmission rate greater than the first format. Therefore, the sound can be stably output through the external sound output device 400 wirelessly connected to the image display device.

[0269] Alternatively, in the monaural output mode of the external sound output device 400 and in the wireless transmission mode of the external sound output device 400, the signal processing device 170 may wirelessly transmit an audio signal based on the first format to the external sound output device 400. Therefore, sound may be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0270] In addition, in the mode of wireless transmission to the external sound output device 400 , the signal processing device 170 may control the audio signal to the external sound output device 400 based on the audio format processable by the external sound output device 400 .

[0271] That is, in the single sound output mode or the simultaneous sound output mode of the external sound output device 400, and in the mode of wireless transmission to the external sound output device 400, the signal processing device 170 can control the audio signal to the external sound output device 400 based on the audio format processable by the external sound output device 400. Therefore, the sound can be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0272] In addition, in a mono output mode of the external sound output device 400 and in a mode of wireless transmission to the external sound output device 400, the signal processing device 170 may wirelessly transmit an audio signal based on the third format to the external sound output device 400, and if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value or the second reference value, the signal processing device 170 may be configured to wirelessly transmit an audio signal based on the fourth format to the external sound output device 400. Therefore, sound can be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0273] In addition, after transmitting the audio signal based on the fourth format, if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value or the allowed value, the signal processing device 170 may switch the wireless transmission mode to the external sound output device 400 to the wired transmission mode, and transmit the audio signal to the external sound output device 400 by wire. In this case, the mono output mode may be performed in the wired transmission mode. Therefore, the sound may be stably outputted by the external sound output device 400 wirelessly connected to the image display device.

[0274] In addition, unlike the accompanying drawings, after transmitting the audio signal based on the second format, if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value or the allowed value, the signal processing device 170 can switch the wireless transmission mode to the external sound output device 400 to the wired transmission mode, and transmit the audio signal to the external sound output device 400 by wire. Therefore, the external sound output device 400 can transmit the signal by wire or wirelessly. In addition, the external sound output device 400 can stably output sound.

[0275] In addition, in the simultaneous sound output mode of the external sound output device 400 and the audio output device 185 and in the mode of wireless transmission to the external sound output device 400, the signal processing device 170 may control the first delay added to the first audio signal to be greater than the second delay added to the first audio signal in the simultaneous sound output mode of the external sound output device 400 and the audio output device 185 and in the mode of wired transmission to the external sound output device 400. Therefore, the sound can be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0276] In addition, the signal processing device 170 may change the format of the audio signal wirelessly transmitted to the external sound output device 400 based on the content displayed on the display 180. Therefore, the sound may be stably output through the external sound output device 400 wirelessly connected to the image display apparatus.

[0277] Figure 8B is a flowchart illustrating an operating method of an image display device according to another embodiment of the present disclosure.

[0278] 1. Referring to the drawings, when the external sound output device 400 is turned on (S805), the interface 550 of the external sound output device 400 may transmit audio format information Sd processable by the external sound output device 400 or audio processing time information of the external sound output device 400 (S810).

[0279] In response thereto, the interface 130a in the image display apparatus 100 may receive audio format information Sd processable by the external sound output device 400 or audio processing time information of the external sound output device 400 (S815).

[0280] Then, the interface 130 a in the image display apparatus 100 may transmit the audio format information Sd processable by the external sound output device 400 to the signal processing device 170 .

[0281] Then, the signal processing device 170 determines whether the external sound output device 400 and the audio output device 185 are in a simultaneous sound output mode (S820).

[0282] The signal processing device 170 may determine whether the simultaneous sound output mode is set when displaying the setting screen.

[0283] Then, the signal processing device 170 determines whether the wireless transmission mode is set during the simultaneous voice output mode (S823).

[0284] In addition, in the simultaneous sound output mode and in the mode of wireless transmission to the external sound output device 400, the signal processing device 170 may output the first audio signal and the second audio signal based on the first format by using the wireless network information (S840).

[0285] That is, the signal processing device 170 can receive audio format information 1010 that can be processed by the external sound output device 400 from the external sound output device 400, and can control the audio signal based on the following audio format to the external sound output device 400, which is an audio format selected from the received audio format information 1010 based on the environment in which the external sound output device 400 is wirelessly connected to the signal processing device 170.

[0286] In addition, a first audio signal based on the first format is input to the audio output device 185, and a second audio signal based on the first format is input to the wireless communication device 135a, so that the first audio signal and the second audio signal can be transmitted to the wirelessly connected external sound output device 400 through the wireless communication device 135a (S842).

[0287] In response to this, the external sound output device 400 may wirelessly receive the second audio signal based on the first format ( S843 ), and may output a sound corresponding to the second audio signal ( S858 ).

[0288] In addition, the wireless communication device 135a receives a retransmission request for the second audio signal from the external sound output device 400, and determines whether the number of received retransmission requests is greater than or equal to a reference value (S844).

[0289] If the number of times the external sound output device 400 requests retransmission is less than the reference value, the wireless output device 135a may continuously output the first audio signal and the second audio signal based on the first format.

[0290] Then, the audio output device 185 receiving the first audio signal may output a sound corresponding to the first audio signal (S850).

[0291] Meanwhile, the external sound output device 400 receiving the second audio signal may output a sound corresponding to the second audio signal.

[0292] Therefore, the external sound output device 400 and the image display apparatus 100 may stably output sound at the same time in the wireless transmission mode.

[0293] At the same time, in operation 844 (S844), if the number of times the external sound output device 400 requests retransmission is greater than or equal to the reference value, the signal processing device 170 can output a third audio signal and a fourth audio signal based on a second format, wherein the second format has a wireless data transmission rate less than the first format (S852).

[0294] In addition, the fourth audio signal based on the second format may be input to the wireless communication device 135a to be transmitted to the wirelessly connected external sound output device 400 through the wireless communication device 135a (S854).

[0295] In addition, the third audio signal based on the second format is input to the audio output device 185, and the fourth audio signal based on the second format is input to the wireless communication device 135a, so that the third audio signal and the fourth audio signal can be transmitted to the wirelessly connected external sound output device 400 through the wireless communication device 135a.

[0296] In response to this, the external sound output device 400 can wirelessly receive the fourth audio signal based on the second format (S853), and can output the sound corresponding to the fourth audio signal (S856). Therefore, the external sound output device 400 and the image display device 100 can stably output the sound at the same time in the wireless transmission mode.

[0297] 9A to 9E are diagrams illustrating various examples of the sound setting screen.

[0298] Reference 9A to 9E The signal processing device 170 can control the following based on the input signal of the remote controller 200: Fig.9A The sound settings screen 910 is shown.

[0299] 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.

[0300] 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 single sound output from the image display device, and an item 928 for single sound output from an external sound output device, such as Fig. 9B shown.

[0301] If the item 920 for simultaneous output is selected, the signal processing device 170 may control the execution of the simultaneous output mode, such as Fig. 9C shown.

[0302] Furthermore, if the wireless transmission item 921 is selected while the item 920 for simultaneous output is selected, the signal processing device 170 may control execution of the simultaneous output mode based on wireless transmission.

[0303] To this end, the signal processing device 170 may output a first audio signal based on the first format to the audio output device 185 , and may be configured to wirelessly transmit a second audio signal based on the first format to the external sound output device 400 .

[0304] In addition, if the number of times the external sound output device 400 requests retransmission is greater than or equal to a reference value, the signal processing device 170 may be configured to wirelessly transmit the audio signal based on the second format to the external sound output device 400 .

[0305] In addition, if the wired transmission item 922 is selected while the item 920 for simultaneous output is selected, the signal processing device 170 may control execution of a simultaneous output mode based on wired transmission.

[0306] In addition, if the item 925 for the image display device to perform single sound output is selected, the signal processing device 170 may control the single sound output mode of the audio output device 185 to be performed.

[0307] In addition, if the item 928 for the external sound output device to perform mono output is selected, the signal processing device 170 can control the explicit wireless transmission item 929 and the wired transmission item 931, such as Fig.9E shown.

[0308] Furthermore, if the wireless transmission item 929 is selected while the item 928 for monaural output by an external sound output device is selected, the signal processing device 170 may control execution of a monaural output mode based on wireless transmission.

[0309] To this end, the signal processing device 170 may be configured to wirelessly transmit an audio signal based on a predetermined format to the external sound output device 400 .

[0310] In addition, if the number of times the external sound output device 400 requests retransmission is greater than or equal to a reference value, the signal processing device 170 may be configured to change the format and wirelessly transmit an audio signal based on the changed format to the external sound output device 400 .

[0311] Furthermore, if the wired transmission item 931 is selected while the item 928 for monaural output of an external sound output device is selected, the signal processing device 170 may control execution of a monaural output mode based on wired transmission.

[0312] Fig. 10A is a diagram illustrating an example of receiving audio format information from the external sound output device 400 .

[0313] Reference Fig. 10A , after the external sound output device 400 is turned on, the signal processing device 170 of the image display apparatus 100 may receive audio format information 1010 that can be processed by the external sound output device 400 .

[0314] In the drawing, an example is illustrated in which, as the external sound output device 400 is turned on while a broadcast video 1005 is displayed, audio format information 1010 processable by the external sound output device 400 is received through a wire.

[0315] Different from the drawing, 1010 may also wirelessly receive audio format information that can be processed by the external sound output device 400 .

[0316] In addition, in the accompanying drawings, the following examples are illustrated: the audio format information 1010 that can be processed by the external sound output device 400 includes a two-channel PCM format 1011, a Dolby Digital format, a Dolby Digital Enhanced format, a Dolby TrueHD MAT format, a DTS format 1013, a DTS-HD format, and a multi-channel PCM format, and the data transmission rates of these formats are 4Mbps, 6Mbps, 9Mbps, 25Mbps, 9Mbps, 25Mbps, and 36Mbps, respectively, but can be modified in various ways.

[0317] Fig. 10B It is a diagram illustrating an example of the simultaneous sound output mode and the wireless transmission mode.

[0318] Reference Fig. 10B In a simultaneous sound output mode of the external sound output device 400 and the audio output device 185 and in a wireless transmission mode to the external sound output device 400, the signal processing device 170 may output a first audio signal based on a first format and a second audio signal based on the first format.

[0319] Therefore, a first audio signal based on the first format can be input to the audio output device 185, and a second audio signal based on the first format can be input to the wireless communication device 135a, so that the first audio signal and the second audio signal can be transmitted to the wirelessly connected external sound output device 400 through the wireless communication device 135a.

[0320] As a result, while displaying the video 1105, the audio output device 185 in the image display apparatus 100 outputs a sound MOC1 corresponding to a first audio signal based on a first format, and the external sound output device 400 outputs a sound MOC2 corresponding to a second audio signal based on a first format received from the signal processing device 170, so that the sounds can be output simultaneously.

[0321] Therefore, the sound can be stably output through the external sound output device 400 wirelessly connected to the image display apparatus. Specifically, the wirelessly connected external sound output device 400 and the image display apparatus 100 can output the sound at the same time.

[0322] Furthermore, based on the content displayed on the display 180 , the signal processing device 170 may change the format of the audio signal wirelessly transmitted to the external sound output device 400 .

[0323] As illustrated herein, if the content displayed on the display 180 is a movie video 1105 , the signal processing device 170 may output a first audio signal and a second audio signal corresponding to a first format, which is a DTS format.

[0324] Fig. 10C 2 is a diagram illustrating another example of the simultaneous sound output mode and the wireless transmission mode.

[0325] Reference Fig. 10C , while sending the second audio signal based on the first format, if the number of times the external sound output device 400 requests retransmission is greater than or equal to a reference value, the signal processing device 170 may control the audio signal based on the second format to be given to the external sound output device 400, wherein the second format has a wireless data transmission rate lower than that of the first format.

[0326] That is, if the number of times the external sound output device 400 requests retransmission while sending a second audio signal based on the first format is greater than or equal to a reference value, the signal processing device 170 may output a third audio signal based on the second format to the audio output device 185, and may be configured to wirelessly send a fourth audio signal based on the second format to the external sound output device 400.

[0327] For example, the first format may be a DTS format and the second format may be a two-channel PCM format.

[0328] As a result, while displaying the video 1105, the audio output device 185 in the image display apparatus 100 outputs a sound MOC3 corresponding to a third audio signal based on the second format, and the external sound output device 400 outputs a sound MOC4 corresponding to a fourth audio signal based on the second format received from the signal processing device 170, so that the sounds can be output simultaneously.

[0329] Therefore, the sound can be stably output through the external sound output device 400 wirelessly connected to the image display apparatus. Specifically, the wirelessly connected external sound output device 400 and the image display apparatus 100 can output the sound at the same time.

[0330] In addition, Fig. 10B and Fig. 10C Differently, if the video displayed on the image display device 100 is a broadcast video, the first format may be the Dolby Digital format instead of the DTS format.

[0331] That is, the signal processing device 170 can select an audio format with a higher data transmission rate or a wider bandwidth when displaying a movie video on the image display device 100, compared with the case where a broadcast video is displayed on the image display device 100. Therefore, the sound suitable for the content can be stably output.

[0332] Fig.11A is a diagram illustrating an example of a mono output mode of an image display device.

[0333] Reference Fig.11A , the signal processing device 170 can output the fifth audio signal in the mono output mode of the image display device while displaying the video 1105.

[0334] Therefore, the audio output device 185 may output the sound MOC5 corresponding to the fifth audio signal. Therefore, only the image display apparatus 100 may output the sound.

[0335] Fig. 11B 1 is a diagram illustrating an example of a wireless transmission mode and a monaural output mode of the external sound output device 400 .

[0336] Reference Fig. 11B In a mono output mode of the external sound output device 400 and a wireless transmission mode to the external sound output device 400 , the signal processing device 170 may be configured to wirelessly transmit an audio signal based on a predetermined format to the external sound output device 400 .

[0337] In response to this, only the external sound output device 400 may output the sound MOC6 corresponding to the audio signal wirelessly received from the signal processing device 170.

[0338] In addition, in a monaural output mode of the external sound output device 400 and a wireless transmission mode to the external sound output device 400, the signal processing device 170 may control an audio signal based on a third format greater than the first format to be given to the external sound output device 400. In this case, the first format may be a DTS format, and the third format may be a multi-channel PCM format.

[0339] Alternatively, in the monaural output mode of the external sound output device 400 and in the wireless transmission mode to the external sound output device 400 , the signal processing device 170 may wirelessly transmit the audio signal based on the first format to the external sound output device 400 .

[0340] Fig. 11C 2 is a diagram illustrating another example of the wireless transmission mode and the monaural output mode of the external sound output device 400 .

[0341] Reference Fig. 11C , in a monaural output mode of the external sound output device 400 and in a mode of wireless transmission to the external sound output device 400, if the number of times the external sound output device 400 requests retransmission while sending an audio signal based on a predetermined format is greater than or equal to a reference value, the signal processing device 170 may output an audio signal based on a format having a lower wireless data transmission rate to the external sound output device 400.

[0342] For example, if the number of times the external sound output device 400 requests retransmission while transmitting the audio signal based on the third format is greater than or equal to the reference value, the signal processing device 170 may be configured to wirelessly transmit the audio signal based on the fourth format to the external sound output device 400, such as Fig. 11C shown.

[0343] For example, the third format may be a multi-channel PCM format, and the fourth format may be a Dolby Digital format or a two-channel PCM format.

[0344] As a result, while the video 1105 is displayed, only the external sound output device 400 can output the sound MOC7 corresponding to the audio signal based on the fourth format received from the signal processing device 170.

[0345] Therefore, the sound can be stably outputted through the external sound output device 400 wirelessly connected to the image display apparatus. Specifically, only the external sound output device 400 wirelessly connected can output the sound.

[0346] FIG. 12A to FIG. 13B is a diagram illustrating an example of outputting sound in the wired transmission mode.

[0347] Fig. 12AThe diagram illustrates an example of the simultaneous sound output mode and the wired transmission mode.

[0348] Reference Fig. 12A In the simultaneous output mode and wired transmission mode, while displaying the broadcast video 1005, the signal processing device 170 can calculate the first additional delay time DDa based on the audio format information or audio processing time information of the external sound output device 400, and can output the first audio signal Stv based on the calculated first additional delay time DDa.

[0349] 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.

[0350] In addition, while displaying the broadcast video 1005, the signal processing device 170 can calculate the second additional delay time DDb based on the audio format information or audio processing time information of the external sound output device 400, and can output the second audio signal Sau based on the calculated second additional delay time DDb.

[0351] In addition, the external sound output device 400 outputs the second sound Sob based on the second audio signal Sau received from the signal processing device 170 .

[0352] 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 PCM audio signal in the audio driver 607 is 10ms, the audio processing time of the PCM audio signal in the external sound output device 400 is 70ms, and the output processing time to the external 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 (which is 100ms-10ms), and the second additional delay time can be set to 10ms (which is 100ms-(70ms+20ms)).

[0353] That is, the second additional delay time may be smaller than the first additional delay time. Therefore, the audio output device 185 and the external sound output device 400 may output the sound synchronized with the video signal.

[0354] Fig. 12B is a diagram illustrating an example of a mono output mode of an image display device.

[0355] Reference Fig. 12B, while displaying the broadcast video 1005, in the mono output mode of the image display device, the signal processing device 170 can calculate the third additional delay time DDc of the fifth audio signal based on the video processing time of the input video signal, while ignoring the audio format information or audio processing time information of the external sound output device 400, and can output the fifth audio signal Stt based on the calculated third additional delay time DDc.

[0356] Therefore, the audio output device 185 of the image display apparatus 100 outputs the third sound Soa2 corresponding to the fifth audio signal Stt.

[0357] Meanwhile, the external sound output device 400 does not output sound.

[0358] 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 the time difference of 90 ms as the third additional delay time DDc.

[0359] In addition, while displaying the broadcast video 1005 on the display 180, the signal processing device 170 can control the additional delay time DDa of the first sound Soa based on the first audio signal Stv output from the audio output device 185 to be greater than or equal to the third additional delay time DDc of the third sound Soa2 based on the fifth audio signal Stt output from the audio output device 185.

[0360] Compare Fig. 12A and Fig. 12B , Fig. 12A The first additional delay time DDa of 90 ms can be equal to Fig. 12B The third additional delay time DDc is 90ms.

[0361] Fig. 12C 1 is a diagram illustrating an example of a monaural output mode and a wired transmission mode of an external sound output device.

[0362] Reference Fig. 12C , while displaying the broadcast video 1005 , in the monaural output mode of the external sound output device 400 , the signal processing device 170 may output an audio signal to the external sound output device 400 , but not output an audio signal to the audio output device 185 .

[0363] Therefore, the audio output device 185 in the image display apparatus 100 does not output sound, and the external sound output device 400 may output the fourth sound Sob2 as the only sound output.

[0364] In the monaural output mode of the external sound output device 400, 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 external sound output device 400, and the time of the output processing to the external sound output device 400, and may output a fourth audio signal based on the fourth additional delay time DDd to the external sound output device 400.

[0365] Furthermore, the fourth additional delay time DDd may be equal to the second additional delay time DDb.

[0366] Fig.13A is a diagram illustrating another example of a mono output mode of the image display device.

[0367] Reference Fig.13A , while displaying the movie video 1105, in the mono output mode of the image display device, the signal processing device 170 can calculate the 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 external sound output device 400, and can output the fifth audio signal Stt based on the calculated third additional delay time DDe.

[0368] 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 the time difference 80 ms as the third additional delay time DDe.

[0369] Therefore, the audio output device 185 in the image display apparatus 100 outputs the third sound Soc1 corresponding to the fifth audio signal Stt based on the third additional delay time DDe. In addition, the external sound output device 400 does not output a sound.

[0370] Fig. 13B It is a diagram illustrating another example of the simultaneous sound output mode and the wired transmission mode.

[0371] Reference Fig. 13B 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 according to the audio format information of the external sound output device 400, the audio processing time in the audio driver 607, and the time of output processing to the external sound output device 400.

[0372] Therefore, the audio output device 185 in the image display apparatus 100 may output the first sound Soc2 corresponding to the first audio signal.

[0373] Furthermore, the external sound output device 400 outputs a second sound Soc3 based on the second audio signal Sau from the signal processing device 170 .

[0374] 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 external sound output device 400 is 120ms, and the time of output processing to the external sound output device 400 is 20ms, the sum of the delays of the external sound output device 400 (not the video processing time) has the largest 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 (which is 140ms-100ms), the first additional delay time can be set to 130ms (which is 140ms-10ms), and considering the delay time of 140ms, the second additional delay time can be set to 0ms. Therefore, the sound synchronized with the video signal can be output from the audio output device 185 and the external sound output device 400.

[0375] That is, as shown in the drawing, 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 external sound output device 400 output sounds at the same time, surround sound can be output.

[0376] In addition, Fig. 12A and Fig. 13B In comparison, the signal processing device 170 can control the additional delay time DDf of the first sound Soc2 based on the first audio signal output from the audio output device 185 while the movie video 1105 is displayed on the display 180, so as to 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 while the broadcast video 1005 is displayed on the display 180.

[0377] As mentioned above, Fig. 13B The additional delay time DDf of the first sound Soc2 may be 130ms (which is 140ms-10ms), and Fig. 12A The additional delay time DDa of the first sound Soa can be 90ms.

[0378] As described above, the image display device according to the 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 in a wired manner; a wireless communication device configured to exchange data with an external sound output device in a wireless manner; and a signal processing device configured to: output a first audio signal to the audio output device in a simultaneous sound output mode of the external sound output device and the audio output device and in a mode of wireless transmission to the external sound output device, and wirelessly transmit a second audio signal based on a first format to the external sound output device, and wirelessly transmit an audio signal based on a second format to the external sound output device in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0379] In addition, in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value, the signal processing device may be configured to wirelessly transmit an audio signal in a second format based on a wireless data transmission rate that is lower than the first format to the external sound output device. Therefore, sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0380] Furthermore, when outputting the audio signal based on the second format, the signal processing device may be configured to output the audio signal based on the first format to the audio output device. Therefore, the sound can be stably outputted through the external sound output device wirelessly connected to the image display device.

[0381] Furthermore, when outputting the audio signal based on the second format, the signal processing device may be configured to output the audio signal based on the second format to the audio output device. Therefore, the sound can be stably outputted through the external sound output device wirelessly connected to the image display device.

[0382] In addition, in a simultaneous sound output mode of an external sound output device and an audio output device and in a mode of wireless transmission to an external sound output device, the signal processing device may be configured to output a first audio signal based on a first format to the audio output device, and wirelessly transmit a second audio signal based on the first format to the external sound output device, wherein in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, the signal processing device may be configured to output a third audio signal based on a second format to the audio output device, and wirelessly transmit a fourth audio signal based on the second format to the external sound output device. Therefore, sound can be stably output through an external sound output device wirelessly connected to an image display device. Specifically, the wirelessly connected external sound output device and the image display device can output sound simultaneously.

[0383] Furthermore, in the mono output mode of the image display device, the signal processing device may be configured to output the fifth audio signal, and the audio output device may be configured to output the sound corresponding to the fifth audio signal. Thus, only the image display device may output the sound.

[0384] In addition, in a mono output mode of the external sound output device and in a mode of wireless transmission to the external sound output device, the signal processing device can be configured to wirelessly transmit an audio signal based on a third format to the external sound output device, the third format having a higher wireless data transmission rate than the first format. Therefore, sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0385] In addition, in the single sound output mode of the external sound output device and in the wireless transmission mode to the external sound output device, the signal processing device can be configured to wirelessly transmit the audio signal based on the first format to the external sound output device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0386] In addition, in a mono output mode of the external sound output device and in a mode of wireless transmission to the external sound output device, the signal processing device may be configured to wirelessly transmit an audio signal based on a third format to the external sound output device, wherein in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value or a second reference value, the signal processing device may be configured to wirelessly transmit an audio signal based on a fourth format to the external sound output device. Therefore, sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0387] In addition, after transmitting the audio signal based on the fourth format, in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value or the allowed value, the signal processing device can be configured to switch the wireless transmission mode to the external sound output device to the wired transmission mode, and transmit the audio signal to the external sound output device via the wire. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0388] In addition, in the mode of wirelessly transmitting to the external sound output device, the signal processing device can be configured to wirelessly transmit to the external sound output device an audio signal based on an audio format that the external sound output device can process. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0389] In addition, the signal processing device can be configured to receive audio format information that can be processed by the external sound output device from the external sound output device, and can be configured to wirelessly send an audio signal based on the following audio format to the external sound output device, wherein the audio format is selected from the received audio format information based on the environment of the wireless connection with the external sound output device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0390] In addition, the interface can be configured to receive audio format information that the external sound output device can process from the external sound output device, and send the received audio format information to the signal processing device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0391] In addition, after transmitting the audio signal based on the second format, in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value or the allowed value, the signal processing device can be configured to switch the wireless transmission mode to the external sound output device to the wired transmission mode, and transmit the audio signal to the external sound output device via wire. Therefore, the signal can be transmitted to the external sound output device via wire or wirelessly. In addition, the external sound output device can stably output sound.

[0392] In addition, the signal processing device can be configured to control the first delay added to the first audio signal in the simultaneous output mode of the external sound output device and the audio output device and in the mode of wireless transmission to the external sound output device to be greater than the second delay added to the first audio signal in the simultaneous output mode of the external sound output device and the audio output device and in the wired transmission mode of wired transmission to the external sound output device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0393] In addition, based on the content displayed on the display, the signal processing device can be configured to change the format of the audio signal wirelessly transmitted to the external sound output device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0394] 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 in a wired manner; a wireless communication device configured to exchange data with an external sound output device in a wireless manner; and a signal processing device configured to: in a mode of wireless transmission to an external sound output device, wirelessly transmit an audio signal based on a first format to the external sound output device, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, wirelessly transmit an audio signal based on a second format to the external sound output device, and after transmitting the audio signal based on the second format, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value or an allowable value, switch the mode of wireless transmission to the external sound output device to a wired transmission mode, and transmit the audio signal to the external sound output device by wire. Therefore, a signal can be transmitted to the external sound output device by wire or wirelessly. In addition, the external sound output device can stably output sound.

[0395] In addition, the interface can be configured to receive audio format information that can be processed by the external sound output device from the external sound output device, and send the received audio format information to the signal processing device, wherein the signal processing device is configured to wirelessly send an audio signal based on the following audio format to the external sound output device, and the audio format is selected from the received audio format information based on the environment of the wireless connection with the external sound output device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0396] In addition, the signal processing device can be configured to control the first delay added to the audio signal sent to the audio output device in the simultaneous sound output mode of the external sound output device and the audio output device and in the mode of wireless transmission to the external sound output device to be greater than the second delay added to the audio signal sent to the audio output device in the simultaneous sound output mode of the external sound output device and the audio output device and in the wired transmission mode of wired transmission to the external sound output device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0397] In addition, based on the content displayed on the display, the signal processing device is configured to change the format of the audio signal wirelessly transmitted to the external sound output device. Therefore, the sound can be stably output through the external sound output device wirelessly connected to the image display device.

[0398] Obviously, although the preferred embodiments have been illustrated and described above, the present disclosure is not limited to the above specific embodiments, and those skilled in the art may make various modifications and variations without departing from the subject matter of the appended claims. Therefore, it is intended that modifications and variations 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 in a wired manner; a wireless communication device configured to exchange data with the external sound output device in a wireless manner; and A signal processing device, the signal processing device being configured to: In a simultaneous sound output mode of the external sound output device and the audio output device and in a wireless transmission mode to the external sound output device, a first audio signal is output to the audio output device, and a second audio signal based on a first format is wirelessly transmitted to the external sound output device, and In response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, an audio signal based on a second format is wirelessly transmitted to the external sound output device.

2. The image display device according to claim 1, wherein: In response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value, the signal processing device is configured to wirelessly transmit an audio signal based on the second format having a smaller wireless data transmission rate than the first format to the external sound output device.

3. The image display device according to claim 2, wherein: The signal processing device is configured to output the audio signal based on the first format to the audio output device when outputting the audio signal based on the second format.

4. The image display device according to claim 1, wherein: In a simultaneous sound output mode of the external sound output device and the audio output device and in a wireless transmission mode to the external sound output device, the signal processing device is configured to output a first audio signal based on the first format to the audio output device, and wirelessly transmit a second audio signal based on the first format to the external sound output device, In which, in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value, the signal processing device is configured to output a third audio signal based on the second format to the audio output device, and wirelessly send a fourth audio signal based on the second format to the external sound output device.

5. The image display device according to claim 1, wherein: In a mono output mode of the image display device, the signal processing device is configured to output a fifth audio signal, and the audio output device is configured to output a sound corresponding to the fifth audio signal.

6. The image display device according to claim 1, wherein: In a monaural output mode of the external sound output device and in a mode of wireless transmission to the external sound output device, the signal processing device is configured to wirelessly transmit an audio signal based on a third format to the external sound output device, the third format having a higher wireless data transmission rate than the first format.

7. The image display device according to claim 1, wherein: In a monaural output mode of the external sound output device and in a wireless transmission mode to the external sound output device, the signal processing device is configured to wirelessly transmit the audio signal based on the first format to the external sound output device.

8. The image display device according to claim 1, wherein: In a monaural output mode of the external sound output device and in a wireless transmission mode to the external sound output device, the signal processing device is configured to wirelessly transmit an audio signal based on a third format to the external sound output device, In response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value or the second reference value, the signal processing device is configured to wirelessly transmit an audio signal based on a fourth format to the external sound output device.

9. The image display device according to claim 8, wherein: After sending the audio signal based on the fourth format, in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value or the allowed value, the signal processing device is configured to switch the wireless transmission mode to the external sound output device to the wired transmission mode, and send the audio signal to the external sound output device via wire.

10. The image display device according to claim 1, wherein: In a mode of wirelessly transmitting to the external sound output device, the signal processing device is configured to wirelessly transmit to the external sound output device an audio signal based on an audio format processable by the external sound output device.

11. The image display device according to claim 1, wherein: The signal processing device is configured to: receiving, from the external sound output device, audio format information that the external sound output device can process, and An audio signal based on an audio format selected from among received audio format information based on an environment of a wireless connection with the external sound output device is wirelessly transmitted to the external sound output device.

12. The image display device according to claim 11, wherein: The interface is configured to receive the audio format information processable by the external sound output device from the external sound output device, and transmit the received audio format information to the signal processing device.

13. The image display device according to claim 1, wherein: After sending the audio signal based on the second format, in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value or the allowed value, the signal processing device is configured to switch the wireless transmission mode to the external sound output device to the wired transmission mode, and send the audio signal to the external sound output device via wire.

14. The image display device according to claim 13, wherein: The signal processing device is configured to control a first delay added to the first audio signal in a simultaneous output mode of the external sound output device and the audio output device and in a mode of wireless transmission to the external sound output device to be greater than a second delay added to the first audio signal in a simultaneous output mode of the external sound output device and the audio output device and in a wired transmission mode of wired transmission to the external sound output device.

15. The image display device according to claim 1, wherein: Based on the content displayed on the display, the signal processing device is configured to change the format of the audio signal wirelessly transmitted to the external sound output device.

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 in a wired manner; a wireless communication device configured to exchange data with the external sound output device in a wireless manner; and A signal processing device, the signal processing device being configured to: In a mode of wirelessly transmitting to the external sound output device, wirelessly transmitting an audio signal based on a first format to the external sound output device, in response to the number of retransmission requests from the external sound output device being greater than or equal to a reference value, wirelessly transmitting an audio signal based on a second format to the external sound output device, and After sending the audio signal based on the second format, in response to the number of retransmission requests from the external sound output device being greater than or equal to the reference value or the allowed value, the wireless transmission mode to the external sound output device is switched to the wired transmission mode, and the audio signal is sent to the external sound output device via wire.

17. The image display device according to claim 16, wherein: The interface is configured to receive audio format information that can be processed by the external sound output device from the external sound output device, and send the received audio format information to the signal processing device, The signal processing device is configured to wirelessly transmit an audio signal based on the following audio format to the external sound output device, wherein the audio format is selected from received audio format information based on an environment of a wireless connection with the external sound output device.

18. The image display device according to claim 16, wherein: The signal processing device is configured to control a first delay added to an audio signal sent to the audio output device in a simultaneous output mode of the external sound output device and the audio output device and in a wireless transmission mode to the external sound output device to be greater than a second delay added to the audio signal sent to the audio output device in a simultaneous output mode of the external sound output device and the audio output device and in a wired transmission mode of wired transmission to the external sound output device.

19. The image display device according to claim 16, wherein: Based on the content displayed on the display, the signal processing device is configured to change the format of the audio signal wirelessly transmitted to the external sound output device.

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