JP2008078867A - Display device, av device, and display system equipped with these - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable it for a user to set up arbitrarily the information for display by which the specification of a connected external device is made possible, in the display which makes the external device connectable by using the digital interface by HDMI. <P>SOLUTION: In the display, identification information which an external device by which HDMI connection is made beforehand holds such as a model and a part number is acquired. A user can set up arbitrarily information for the display based on the discernment information. Further, when the display or the external device becomes the state of power supply ON (S11), a display acquires identification information on the external device using the CEC command (S12). Then, in the display, in comparison with the acquired identification information and the identification information saved by itself, it is distinguished whether there is identification information in agreement (S13). If there is identification information in agreement here, information for display saved and associated with the identification information is displayed (S14). If these are not in agreement, the identification information acquired from the external device is displayed (S15). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device, an AV device, and a display system, and more specifically, a display device that can be connected to an AV device such as a DVD playback device through a digital interface based on HDMI (High Definition Multimedia Interface), and an external device in the display device And a display system including the display device and the AV device.

HDMI is widely used as a digital interface for video transmission. HDMI is arranged for AV equipment by adding an audio transmission function and a copyright protection function to DVI, which is a standard for connecting a PC and a display.
Conventionally, multiple cables for video, audio, and control signals were used for connection between devices. However, HDMI requires only one cable, and the control signal supports bidirectional transmission. By relaying a control signal to an output device such as an STB (Set Top Box) or a DVD player connected via HDMI, it is possible to operate the entire AV system such as a home theater with a single remote controller.

  In such an AV system using an interface based on HDMI, for example, various output devices that are HDMI source devices and repeater devices that relay streams of the output devices to the HDMI terminal of a display device that is a sink device. External devices are connected. In this case, for example, when the display device includes a plurality of HDMI input terminals, or when an external device including a plurality of HDMI input terminals such as an AV amplifier is connected to the HDMI terminal of the display device, the display device is included. A plurality of output devices can be connected to the AV system.

  In such a case, the display device acquires the identification information of the device held in advance by the output device, and displays the identification information such as the device name based on the device information in the input display such as the input switching menu. Or the identification information of the apparatus selected from the apparatus name information prepared beforehand according to the apparatus information acquired from the output apparatus is displayed. In this case, the identification information is information such as a device name and a model number determined by a device manufacturer, for example.

Regarding the display technology of device name information in a system in which such a plurality of devices are connected, for example, Patent Document 1 discloses that a television receiver having a plurality of external video input terminals is connected to an external video input terminal. There has been disclosed a television receiver that can display a name corresponding to the name of a video device and display the corresponding name when an external video input is selected. As a result, the user can freely and effectively use a plurality of external video input terminals, and the selected video device can be seen at a glance.
Japanese Patent No. 2765834

  In the AV system as described above, when displaying identification information such as a device name of an external device connected to a display device, a specific type is conventionally used even when a plurality of external devices are connected to the display device. The external devices (for example, DVD player, HDD recorder, STB (Set Top Box)) are assumed to be connected one by one. In particular, there was no display confusion.

  However, as described above, a usage form in which a plurality of output devices of the same type are connected to a display device having a plurality of external input terminals is normal, and the conventional display method as described above is inconvenient. Yes. For example, it may be used in a form in which a plurality of DVD players are connected to the HDMI power terminal of a television device as a display device.

  In such a case, according to the conventional display method of the external device, for example, when the display device acquires the identification information from a plurality of external devices of the same model, the identification information is the same, so these are distinguished. I can't. For example, when two identical DVD players of the same type are connected to input 1 and input 2 of the display device, the identification information held by these DVD players is the same, and the same identification information is displayed on inputs 1 and 2. Therefore, the DVD players connected to these inputs 1 and 2 cannot be distinguished on the display screen.

  In HDMI, a physical address for specifying an installation position of an external device is assigned in the order in which communication is performed with a display device (sink device). Here, for example, when DVD1 and DVD2 are connected to the display device at the same time, a momentary power failure occurs, the HDMI cable is once disconnected and reconnected, or the AC power of the external device is disconnected and reconnected again. In such a case, the addresses are assigned in the order in which the communication is recovered, so that there is a possibility that the input 1 DVD player and the input 2 DVD player are switched, which causes a confusion for the user.

  The television receiver disclosed in Patent Document 1 is not basically related to a system connected through an HDMI interface, and does not disclose any technique for handling identification display of an external device connected through HDMI. Further, in Patent Document 1, a plurality of names corresponding to each video terminal input of a television device are prepared in advance in the television device, and a user selects a desired name from the names and displays it. It was. In this case, the device name cannot be arbitrarily given, so that the convenience is low. For example, when the same device is connected to the display device at the same time, there is a problem that it becomes difficult for the user to understand.

  The present invention has been made in view of the above circumstances, and in a display device that allows connection of an external device using a digital interface based on HDMI, display information that can identify the connected external device is provided to the user. Can be set arbitrarily, so that even if multiple external devices of the same model are connected, a display device that can easily recognize the connected device without causing confusion, and a display system including the display device The purpose is to provide.

  In order to solve the above-mentioned problem, the first technical means of the present invention is a display device in which an external device can be connected using an interface based on the HDMI standard, and the display device uses a CEC command based on the HDMI standard. Then, from the external device connected to the display device, the identification information of the external device held by the external device is acquired, and arbitrary display information for specifying the external device is associated with the acquired identification information. It is characterized by being settable.

  According to a second technical means, in the first technical means, the display device acquires identification information from an external device at a predetermined timing using a CEC command, and display information associated with the acquired identification information is set. If set, the set display information can be displayed.

  According to a third technical means, in the first technical means, when the display device acquires the identification information from the external device, the display information associated with the acquired identification information is not set. The apparatus name information based on the information or the identification information is displayed.

  According to a fourth technical means, in the first technical means, when the display device sets the display information, the display device transmits the display information to the external device that has acquired the identification information by using the CEC command. It is characterized by that.

  According to a fifth technical means, in the fourth technical means, the display device acquires display information from an external device at a predetermined timing using a CEC command, and the acquired display information can be displayed. It is a feature.

  In a sixth technical means, in the second or fifth technical means, the predetermined timing is shifted from a state where communication by a CEC command between the display device and the external device is impossible to a state where the predetermined timing is possible. It is characterized by the timing.

  A seventh technical means is an AV device capable of outputting or relaying a stream of AV data based on the HDMI standard. The AV device uses the CEC command based on the HDMI standard to identify itself held by the AV device. The information is transmitted to the display device to which the AV device is connected, and the AV device receives and stores the display information set in association with the transmitted identification information, and the stored display information is predetermined. It outputs to a display apparatus at the timing of this.

  An eighth technical means is the timing according to the seventh technical means, wherein the predetermined timing is changed from a state in which communication by a CEC command between the display device and the AV device is impossible to a state in which communication is possible. It is characterized by being.

  A ninth technical means includes any one of the first to sixth technical means and the seventh or eighth technical means, wherein the AV device is connected to a display device as an external device. It is what.

  According to the present invention, in a display device in which an external device can be connected using a digital interface based on HDMI, the user can arbitrarily set display information that can specify the connected external device. It is possible to provide a display device that can easily recognize a connected device without causing confusion even when a plurality of external devices of the same model are connected, and a display system including the display device.

  In the embodiment of the present invention, in a display device such as a television device provided with an HDMI interface, identification information held by an HDMI-connected external device can be acquired, and a user can arbitrarily set display information based on the identification information. Like that. That is, the display information is label information that can be individually set for each of the external devices, and separate display information can be individually labeled for a plurality of external devices of the same model.

  The identification information is identification information for each model (model number) determined by the manufacturer of the device as described above, for example. Further, the external devices include all AV devices that are HDMI-connected to the display device, such as an output device that can output an AV data stream and a repeater device such as an AV amplifier that relays the stream output from the output device.

  In one embodiment of the present invention, the set display information is held on the display device side, and when the HDMI device is connected to the display device, or the power of the connected HDMI device is turned on. When the communication is performed, the display device acquires the identification information held by the HDMI device. The display device can display preset display information based on the acquired identification information.

  In another embodiment according to the present invention, display information set in a display device is transferred to an external device connected to the display device, and the device name information is held in the external device. The display device can acquire the device name information and display it on the display screen when the power of the external device is turned on or when the HDMI cable is replaced.

  Further, in another embodiment according to the present invention, the display information installed in the display device is held by the display device and is transferred to and held by the connected external device. In the display device, if the display information can be acquired from the external device, the display information is displayed. If the display information cannot be acquired, the external device identification information is acquired, and the display information corresponding to the identification information is retrieved and displayed. I will let you.

  CEC (Consumer Electronics Control) included in the HDMI standard is used for obtaining the identification information of the external device in the display device and transferring the display information set for the external device. CEC is a control protocol standardized by HDMI. By exchanging CEC commands, which are control signals based on the protocol, between devices, the display device recognizes the connection configuration of the external device and connects to the connected external device. It is possible to execute processing for acquiring identification information from the device and storing display information.

FIG. 1 is a block diagram for explaining an embodiment of a display device of the present invention, and shows an example in which the display device of the present invention is applied to a television device.
The display device 10 includes an HDMI receiver 11, a HOST CPU 12, and a monitor microcomputer 13. The HDMI receiver 11 receives a stream transmitted from an HDMI compatible external device such as an output device or a repeater device.

  The HOST CPU 12 controls the entire apparatus. The monitor microcomputer 13 is connected to a CEC line for transferring a CEC command. The monitor microcomputer 13 operates even when the apparatus is in the standby mode, and is maintained in a state in which transmission / reception of CEC commands and reception of remote control signals are possible.

  The display device 10 is capable of a plurality of external inputs other than HDMI. Switching of the external part input is executed by the video switch 16. The video signal switched by the video switch 16 and the data stream received by the HDMI receiver 11 are input to the video processor 14 and various video signal conversion processes are performed. For example, the video processor 14 appropriately performs image signal conversion processing such as noise reduction, scaling and IP conversion, or image quality adjustment such as image quality enhancement correction processing and γ correction processing. Then, the display device 15 is driven and controlled in accordance with a display video signal output from the video processor 14 to display a video. For example, a liquid crystal panel is used for the display unit of the display device 15.

  Although the processing block of the video signal is shown above, the HDMI receiver 11 separates the video / audio of the input stream, and the separated audio signal is output as audio from a speaker (not shown).

  FIG. 2 is a block diagram for explaining a configuration example of an AV system to which the present invention can be applied, and shows a configuration example in which a display device 10, a repeater device 20, and an output device 30 are connected. . As described above, the repeater device 20 and the output device 30 correspond to the AV device according to the present invention and correspond to the external device connected to the display device 10. The output device 30 and the repeater device 20 are connected by an HDMI cable, and the repeater device 20 and the display device 10 are further connected by an HDMI cable.

  The output device 30 is, for example, a DVD recorder, HDD recorder, D-VHS recorder, digital video camera, or the like having an HDMI terminal. The repeater device 20 is an AV amplifier having an HDMI terminal that can input and output an HDMI stream. The display device 10 is a liquid crystal television or monitor having an HDMI terminal. If a repeater device such as an AV amplifier has input terminals for a plurality of HDMI streams, a plurality of output devices 30 can be connected, and the input line can be switched by the selector function of the AV amplifier.

  The HDMI cable transmits a TMDS (Transition Minimized Differential Signaling) line (digital signal transfer line) 41 for transmitting video and audio signals, which are digital signals, in a differential manner, and a control signal (CEC command) that is common between the devices. And a CEC line 42 which is a bidirectional bus for transmission. In addition, the HDMI cable includes a DDC line (not shown) used for transmission of EDID (Extended Display Identification Data), HDCP authentication, and the like.

  A stream including video / audio is transmitted using the TMDS line 41. The TMDS line 41 is a serial transmission line, and is provided with, for example, three data transmission lines for each channel of red (R), green (G), and blue (B) and one clock transmission line. The video signal decomposed into R, G and B is transmitted as a baseband signal in the transmission path, and the audio signal is inserted in the blanking period of the video signal and transmitted simultaneously with the video signal. HDMI also supports transmission of multi-surround audio signals such as 5.1 ch and 6.1 ch, and can simultaneously transmit multi-surround audio signals by inserting them into video signals.

  In order to realize the display function of the external device in the display device 10 according to the present invention, a CEC command transferred via the CEC line 42 is used. As described above, CEC is a control protocol standardized by HDMI, and the CEC command is a control signal based on the CEC protocol. Various operations are controlled between the display device 10 and the connected device by exchanging information between the devices using the CEC command.

  The output device 30 includes an HDMI transmitter 31, a HOST CPU 32, a front microcomputer 33, and a CEC I / F 34. The HDMI transmitter 31 reads video data and audio data recorded on a medium such as a DVD, and converts the audio signal into an HDMI format stream inserted during the blanking period of the video signal. Then, the converted stream is transferred to the repeater device 20 through the TMDS line 41. The HOST CPU 32 includes an HDMI controller and controls the operation of the HDMI transmitter 31.

  The CEC I / F 34 connects the CEC line 42 in the HDMI cable and enables bidirectional communication of CEC commands with the repeater device 20. The operation of the CEC I / F 34 is controlled by the front microcomputer 33 including the CEC controller, and can control the HDMI-connected device by the CEC command. In the case of CEC, since the logical address (device type) and physical address (device position) of each HDMI-connected device are acquired, a CEC command can be sent to a desired device by specifying this logical address and physical address. Can be sent.

  The HOST CPU 32 controls the entire apparatus. The front microcomputer 33 operates with low power and always monitors CEC commands transferred from the CEC line 42. If there is a remote control device, the presence or absence of transmission of the remote control signal is monitored. Further, the front microcomputer 33 is operating even when the HOST CPU 32 is down due to the standby mode of the apparatus or the like (at least in a state where the CEC command can be transferred).

  The repeater device 20 includes an HDMI receiver 21, an HDMI transmitter 22, a HOST CPU 23, a front microcomputer 24, and a CEC I / F 25. The repeater device 20 receives the stream transferred from the output device 30 by the HDMI receiver 21, further transmits it from the HDMI transmitter 22, and transfers it to the display device 10. Further, the CEC I / F 25 connects the CEC line 42 to the output device 30 and the CEC line 42 to the display device 10.

  The HOST CPU 23 and the front microcomputer 24 have the same functions as the output device 30 described above. The HOST CPU 23 controls the HDMI receiver 21 and the HDMI transmitter 22 and controls the entire device. The front microcomputer 13 includes a CEC controller and monitors CEC commands transferred from the CEC line 42.

  When the repeater device 20 has a plurality of HDMI input terminals such as an AV amplifier, a plurality of HDMI devices can be connected as the output device 30. In this case, the input port of the stream to be transferred to the display device 10 can be appropriately switched by the select function of the repeater device 20. The switching of the input port of the stream can be realized by a CEC command corresponding to an operation on the display device 10.

  The display device 10 includes a HOST CPU 17 having a built-in HDMI receiver, a monitor microcomputer 13, and a CEC I / F 18. The display device 10 receives the stream sent from the repeater device 20 by the HOST CPU 17 with a built-in HDMI receiver. Further, the CEC line 42 is connected to the repeater device 20 by the CEC I / F 34.

  The HOST CPU 17 has a built-in HDMI receiver and controls the entire apparatus. The HOST CPU 17 with a built-in HDMI receiver corresponds to the HDMI receiver 11 and the HOST CPU 12 in FIG. 1, and the HDMI receiver and the HOST CPU may be separated as in the configuration in FIG.

  The monitor microcomputer 13 includes a controller for the CEC line 42 and monitors CEC commands transferred from the CEC line 42. The monitor microcomputer 13 controls the light receiving unit 19 that receives a remote control signal from the remote control device 50. Even when the HOST CPU 17 is down in the standby mode of the apparatus or the like, the monitor microcomputer 13 operates to maintain a state in which transmission / reception of CEC commands and reception of remote control signals are possible.

  In the display device 10, the video / audio of the stream is separated by the HDMI receiver built in the HOST CPU 17, and the video is displayed on a display screen such as a display by performing predetermined video signal processing and audio signal processing as necessary. At the same time, sound is output from the speaker. When a video / audio signal is input from a path other than HDMI, the output signal is switched by a video / audio switch.

  FIG. 3 is a flowchart for explaining a display information setting processing example in the display device of the present invention. In the embodiment according to the present invention, in a display device to which a plurality of external devices are connected, display information unique to each external device is set based on identification information acquired from an external device connected by HDMI using a CEC command. (Step S1). The display information is label information that can be individually set for each external device as described above, and can be individually labeled for a plurality of external devices of the same model. is there.

  For example, a user name that uses an external device can be set in the label information. For example, when two external devices (for example, HDDs) of the same model are connected as an example, display information “HDD for father” is labeled on one (HDD1) and the other (HDD2) is labeled. On the other hand, display information “Mom HDD” can be labeled. By setting such display information, even if a plurality of external devices of the same model are connected to the display device, the user can easily distinguish and recognize them.

  In one embodiment according to the present invention, the display information of the external device set in the display device is stored in the internal memory area of the display device (step S2). At this time, display information is recorded in association with identification information (model, model number, etc.) originally held by each external device.

  In another embodiment (embodiment 2) according to the present invention, display information of an external device set by the display device is transmitted to each external device connected via HDMI using a CEC command. Then, the external device stores its display information in an internal memory area (step S3).

  In yet another embodiment (embodiment 3) according to the present invention, the display information of the external device set in the display device is stored in the internal memory area of the display device, and is stored in each HDMI-connected external device. On the other hand, it is transmitted using a CEC command. Then, the external device stores its display information in an internal memory area (step S4). In the display device, display information is recorded in association with identification information (model, model number, etc.) held by each external device.

  FIG. 4 is a flowchart for explaining an example of information display processing of an external device in the display device of the present invention, and shows an example of determination processing of Embodiment 1 in which display information is stored in the display device. In a system in which an external device is connected to a display device, the display device sends a CEC command from the HDMI-connected external device when either the display device itself or the external device is turned on (step S11). The identification information (model, model number, etc.) of the device is acquired by using it (step S12).

Note that the power ON in this case indicates the timing when the CEC command communication is enabled when the power is supplied from the state where the AC power is not supplied to the device and the CEC command communication is impossible. Therefore, not only such power ON but also when the HDMI cable is once disconnected and reconnected, the CEC communication can be performed to acquire the identification information of the external device. The same applies to the following embodiments.
Further, in the display device, when the HDMI cable is disconnected or the AC power supply to the external device is interrupted and the CEC link is disconnected, this may be displayed to alert the user.

  Then, the display device compares the identification information acquired from the external device with the identification information of the external device held by itself, and determines whether there is matching identification information (step S13). If the identification information stored in the display device matches the identification information acquired from the external device, the display information stored in association with the identification information is displayed on the screen of the display device (step S14). . If the identification information stored in the display device does not match the identification information acquired from the external device, the identification information acquired from the external device is displayed (step S15). In this case, the identification information acquired from the external device may be displayed as it is, or device type information that can be derived from the identification information may be displayed.

  FIG. 5 is a flowchart for explaining another example of the information display processing of the external device in the display device of the present invention, and shows an example of the determination processing of the second embodiment in which display information is stored in the external device. . In a system in which an external device is connected to the display device, the display device sends a CEC command from the HDMI-connected external device when either the display device itself or the external device is turned on (step S21). The information for display held by the device is acquired (step S22). This display information is transmitted from the display device to the external device in step S3 of FIG.

  Then, the display device determines whether or not the display information has been successfully acquired from the external device (step S23). In this case, when a new external device that does not store display information is connected, the display information cannot be acquired from the external device.

  If the display device succeeds in acquiring display information from the external device, the acquired display information is displayed on the display device (step S24). If the display information acquisition fails, the display device acquires identification information (model, model number, etc.) from the external device, and displays the identification information (step S25). Here, the identification information acquired from the external device may be displayed as it is, or device type information that can be derived from the identification information may be displayed.

FIG. 6 is a flowchart for explaining still another example of the information display processing of the external device in the display device of the present invention, and an example of determination processing of the third embodiment in which display information is stored in the display device and the external device. It is shown.
In a system in which an external device is connected to the display device, the display device sends a CEC command from the HDMI-connected external device when either the display device itself or the external device is turned on (step S31). The information for display held by the device is acquired (step S32). This display information is transmitted from the display device to the external device in step S4 of FIG.

  Then, the display device determines whether or not the display information has been successfully acquired from the external device (step S33). In this case, when a new external device that does not store display information is connected, the display information cannot be acquired from the external device.

  If the display device succeeds in acquiring display information from the external device, the acquired display information is displayed on the display device (step S34). If the display information acquisition fails, the display device acquires identification information from the external device, compares the identification information with the identification information of the external device held by the display device, and there is matching identification information. Is determined (step S35).

  If the identification information stored in the display device matches the identification information acquired from the external device, the display information stored in association with the identification information is displayed on the screen of the display device (step S36). . If the identification information stored in the display device does not match the identification information acquired from the external device, the identification information acquired from the external device is displayed (step S37). In this case, the identification information acquired from the external device may be displayed as it is, or device type information that can be derived from the identification information may be displayed.

  In the above example, it is assumed that the identification information held by the external device is the same for the same model and model number. For example, when identification information unique to the device such as a serial number is assigned. Any display information can be set in correspondence with the unique identification information.

  Next, an embodiment of the display system of the present invention is configured by the display device and the external device as described in the above embodiment. In other words, according to the embodiment of the display system of the present invention, the user can arbitrarily set display information that enables identification of the external device connected to the display device, and thereby the identification of the display information of the external device acquired from the external device. It can be automatically displayed based on the information. When display information is held by an external device, the display information acquired from the external device can be displayed on the display device. The display system according to the present invention can easily recognize connected devices without causing confusion even when a plurality of external devices of the same model are connected to the display device.

  In the above-described embodiment, a television apparatus having an HDMI terminal as a sink device has been described as an example applied to the display device of the present invention. However, the display system of the present invention includes display means for performing input display of the HDMI terminal and an external device. For example, a DVD device having an HDMI terminal and having a small display built in the main body, a DVD device having an HDMI terminal and having an external display connected to the main body is used as the sink device. Also good.

It is a block diagram for demonstrating one Embodiment of the display apparatus of this invention. It is a block diagram for demonstrating the structural example of the AV system which can apply this invention. It is a flowchart for demonstrating the example of a setting process of the information for display in the display apparatus of this invention. It is a flowchart for demonstrating an example of the information display process of the external apparatus in the display apparatus of this invention. It is a flowchart for demonstrating the other example of the information display process of the external apparatus in the display apparatus of this invention. It is a flowchart for demonstrating the further another example of the information display process of the external apparatus in the display apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Display apparatus, 11 ... HDMI receiver, 12 ... HOST CPU, 13 ... Monitor microcomputer, 14 ... Video processor, 15 ... Display device, 16 ... Video switch, 17 ... HOST CPU, 18 ... CEC I / F, 19 ... Light reception , 20 ... repeater device, 21 ... HDMI receiver, 22 ... HDMI transmitter, 23 ... HOST CPU, 24 ... front microcomputer, 25 ... CEC I / F, 30 ... output device, 31 ... HDMI transmitter, 32 ... HOST CPU, 33 ... front microcomputer, 34 ... CEC I / F, 41 ... TMDS line, 42 ... CEC line, 50 ... remote control device.

Claims (9)

  In a display device in which an external device can be connected using an interface based on the HDMI standard, the display device uses the CEC command based on the HDMI standard to transmit the external device from the external device connected to the display device. A display device characterized by acquiring identification information of the external device held by the device, and setting arbitrary display information for specifying the external device in association with the acquired identification information .   The display device according to claim 1, wherein the display device acquires the identification information from the external device at a predetermined timing using the CEC command, and the display information associated with the acquired identification information. A display device characterized in that, when is set, the set display information can be displayed.   The display device according to claim 1, wherein when the identification information is acquired from the external device and display information associated with the acquired identification information is not set, A display device that displays identification information or device name information based on the identification information.   The display device according to claim 1, wherein when the display information is set, the display device uses the CEC command to display the display information to the external device that has acquired the identification information. A display device characterized by transmitting.   5. The display device according to claim 4, wherein the display device acquires the display information from the external device at a predetermined timing using the CEC command, and enables the acquired display information to be displayed. Characteristic display device.   6. The display device according to claim 2, wherein the predetermined timing is a timing at which a transition from a state where communication by the CEC command between the display device and the external device is impossible to a state where the communication is possible. A display device characterized by being.   In an AV device capable of outputting or relaying a stream of AV data based on the HDMI standard, the AV device uses the CEC command based on the HDMI standard to identify its own identification information held by the AV device. The AV device receives and stores the display information set in association with the transmitted identification information, and stores the stored display information in a predetermined manner. An AV apparatus that outputs to the display device at a timing.   8. The AV device according to claim 7, wherein the predetermined timing is a timing at which a transition from a state where communication by the CEC command is impossible between the display device and the AV device to a state where the communication is possible. AV device characterized by.   A display device according to any one of claims 1 to 6 and an AV device according to claim 7 or 8, wherein the AV device is connected to the display device as the external device. Display system.

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