JP2009141940A - Video display device, display panel and video processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a cooperative operation between a monitor device and a set top box satisfactorily even if the monitor device for performing video display and the set top box for transmitting a video signal to the monitor device through a prescribed interface are configured to be different bodies from each other. <P>SOLUTION: This video display device is provided with: the monitor device (11) for performing video display; and a video processor (12) which outputs a video signal to the monitor device through a prescribed interface and is a housing different from the monitor device. The monitor device is provided with a first power button, the video processor is provided with a second power button, and a remote control device for operating either the monitor device or the video processor is provided with a third power button. Even when any of the first power button, the second button and the third power button is operated, the powers of the monitor device and the video processor are cooperatively controlled so as to equalize the power states of the monitor device and the video processing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the case where a video display device is configured by connecting a display panel and a video processing device, which are configured with separate casings, via an interface, the display panel and the video processing device operate well. It is related to the technology to make it.

  In a video display device such as a television receiver using a flat panel such as an LCD or PDP, an image including a monitor device including a flat panel and a tuner is provided so as to be able to be mounted on a wall by improving the degree of freedom of installation layout. In some cases, the processing apparatus is separated from each other, and they are configured as separate casings. As such a prior art, for example, the one described in Patent Document 1 is known.

  This Patent Document 1 separates a video processing device (hereinafter sometimes referred to as “set-top box”) having a tuner / video processing unit connected to an antenna terminal and a monitor device including a flat panel for displaying video. Thus, there is described a television receiver in a form in which each device is a separate casing and each device is connected by a dedicated transmission cable.

Japanese Patent Laying-Open No. 2005-086721

  In order for the set-top box device and the monitor device to cooperate and operate as an integrated television receiver, it is necessary to recognize that both the set-top box and the monitor device are specific devices that can operate in conjunction with each other. There is. However, Patent Document 1 does not disclose a configuration for the set top box or the monitor device to recognize whether or not the other party (device) connected to each other is a device that can perform a cooperative operation. Also, no consideration is given to the case where the set-top box and the monitor device are connected to a partner (device) that is not capable of cooperative operation. Furthermore, when one of the power of the set top box and the monitor device is OFF, the user often does not use the video display device including the set top box and the monitor device. Nevertheless, if the other device is turned on when the power of one device is turned off, extra power is consumed even when the video display device is not used. Further, when the power supply of one device is ON and the power supply of the other device is OFF, the above-described cooperative operation may not be performed. Patent Document 1 does not take into consideration such a problem related to the mismatch of the power supply state between the set top box and the monitor device.

  Incidentally, in recent years, an interface based on the HDMI (High-Definition Multimedia Interface) standard for transmitting digital video / audio may be used as an interface for connecting video devices to each other (hereinafter, this interface is simply referred to as “ HDMI "). In HDMI, a CEC (Consumer Electric Control) communication protocol is defined as a communication protocol for control between devices (for example, refer to HDMI-Specification Informational Ver1.0).

  In HDMI, in order to recognize that both a set-top box and a monitor device are devices that can operate in conjunction with each other, a signal transmission-side device (here, a set-top box) is connected to a signal reception-side device (here, a monitor). The device information (EDID: manufacturer name, product code, resolution, etc.) associated with the device (equivalent to the device) is acquired from the signal receiving device. However, the monitor device cannot acquire the device information of the set top box device by the same mechanism.

  When the set-top box and the monitor device are connected via an HDMI cable via a relay device having an input / output compatible with the HDMI interface, the device information acquired by the set-top box is only the device information of the relay device. Therefore, the device information of the monitor device cannot be obtained. That is, there is a problem that the set-top box device and the monitor device cannot recognize each other only by the mechanism of acquiring EDID information, and cannot operate as an integrated television receiver.

  The present invention has been made in view of such a problem, and provides a technique for satisfactorily operating a video processing apparatus and a monitor apparatus that are configured separately from each other.

  According to the present invention, a monitor device that displays a video and a video processing device that performs predetermined processing on an input video signal and outputs the processed video signal to the monitor device via a predetermined interface are connected to each other in a predetermined manner such as HDMI. The monitor device and the video processing device can receive or transmit an authentication command associated with the device from the device of the connection partner. When one or both of the monitor device and the video processing device receives the authentication command, a control signal is transmitted and received between the monitor device and the video processing device to perform a cooperative operation. It is.

  The display panel is configured to receive a remote control signal from a remote control device for operating the video display device. When performing the cooperative operation, the display panel receives a command based on the remote control signal received by the monitor device. When a control signal is transmitted to the video processing device via the interface and the panel device performs a single operation, a remote control signal received by the monitor device is processed inside the monitor device. Further, the video processing device is configured to be able to transmit a control signal for adjusting image quality as the control signal to the panel device, and when performing the cooperative operation, the control signal for adjusting the image quality Is transmitted to the panel device via the interface.

  The interface is preferably HDMI. The authentication command and the control signal are transmitted via a CEC (Consumer Electric Control) line in the HDMI.

  During the cooperative operation, the image quality correction unit built in the video processing device and the image quality correction unit built in the monitor device may be controlled in cooperation with each other using the control signal.

  Furthermore, the present invention is configured to be able to transmit and receive information regarding the power state of each device via the interface between the monitor device and the video processing device, and each of the monitor device and the video processing device. Another feature is that the power supply of the monitor device and the video processing device is controlled so that the power supply state matches. For example, when one of the monitor device and the video processing device is powered on, the other device is powered on. When one device is powered off, the other device is powered off. The power matching control between the two devices is performed using an authentication command transmitted / received between the monitor device and the video processing device, and the authentication command is used in one or both of the devices. In addition, control of the power supply is permitted.

  With this configuration, the video processing apparatus and the monitor apparatus cooperate to form a system that operates as an integrated television receiver.

  According to the present invention, it is possible to satisfactorily operate the video processing apparatus and the monitor apparatus configured separately from each other.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an example of an embodiment according to the present invention. The set top box 11 and the monitor 12 are connected by an HDMI cable and constitute a television receiving system as an integral video display device. First, the operation of the set top box 11 which is a video processing apparatus will be described. The set top box 11 is turned on when the power SW 110 is pressed, reads the EDID data 127 of the monitor 12 from the DDC interface 112 and transmits it to the control microcomputer 113. As described in HDMI-Specification Informational Ver1.0, the control microcomputer 113 acquires the physical address included in the EDID data and the video format corresponding to the monitor 12. The tuner 118 receives a video signal such as a digital television signal. Here, the digital television signal is compressed and encoded by, for example, MPEG-2, MPEG-4, or the like. In the video / audio processing unit 114, the compressed and encoded digital television signal is converted into an uncompressed video signal, and then converted into the video format by pixel conversion and frame rate conversion. From the TMDS transmitter 115 to the TMDS of the HDMI cable The signal is transmitted to the monitor 12 through the line 103. Further, when the control microcomputer acquires the physical address, the set top box 11 can transmit a CEC command as a control signal, and transmits a polling CEC command from the CEC interface 111 to the HDMI CEC line 101. Then, the logical address in the CEC network is determined. After the logical address is determined, a CEC command for notifying the logical address and the physical address is transmitted to the entire CEC network.

  Next, the operation of the monitor 12 will be described. The video signal transmitted through the HDMI TMDS line 103 is received by the TMDS receiver 126, subjected to image quality correction processing by the video / audio signal processing unit 124, and then displayed on the video display unit 128. In this image quality correction process, the correction amount is controlled by the control from the control microcomputer 123. Since the physical address of the monitor 12 is determined, it is possible to transmit a CEC command as a control signal after the control microcomputer 123 is activated, and transmit a polling CEC command from the CEC interface 121 to the HDMI CEC line 101. The logical address in the CEC bus system is determined. After the logical address is determined, a CEC command for notifying the logical address and the physical address is transmitted to the entire CEC network.

  The monitor 12 is provided with a remote control light receiving portion 129 for receiving a remote control signal transmitted from the remote control device 14 for operating or controlling the television receiving system. The monitor 12 itself is the remote control 14. It is also possible to start up the power supply by a power ON signal from.

  Next, the cooperative authentication operation between the set top box 11 and the monitor 12 will be described. FIG. 2 is a flow of cooperative authentication. Reference numeral 11 in FIG. 2 indicates a set top box 11, and reference numeral 12 indicates a monitor 12. First, the set top box 11 executes the EDID lead 211 of the monitor 12. Around this time, the monitor 12 issues a command 212 for notifying the logical address “TV” and the physical address to the entire CEC network. The set top box 11 receives this command 212 and recognizes that there is a device whose logical address is “TV”. Thereafter, after the physical address and the logical address are determined, the set top box 11 issues a command 213 for notifying the logical address “tuner” and the physical address to the entire CEC network. The monitor 12 receives this command 213 and grasps that there is a device having the logical address “tuner”. These commands 212 and 213 are issued by other devices with the logical address “television” and logical address “tuner” devices, and cooperation authentication is not established only in this state.

  Since the command 213 is issued, the monitor 12 can grasp that the device having the logical address “tuner” can transmit and receive the CEC command (that is, can operate in cooperation with the device of “TV”). Issues a CEC vendor command for cooperative authentication 214 indicating that this is a specific device capable of cooperative operation. When the set-top box 11 capable of cooperating with the monitor 12 receives the vendor command 214, the set-top box 11 recognizes that a monitor capable of cooperating operation is connected via the CEC network, shifts to cooperating operation mode, and can also perform cooperating operation. A CEC vendor command 215 for cooperative authentication indicating a specific device is issued. When the monitor 12 receives the vendor command 215, the monitor 12 recognizes that a collaborative set top box is connected, and shifts to the collaborative operation mode. With these command sequences, the set-top box 11 and the monitor 12 enter a cooperative operation mode by transmitting and receiving CEC commands via the CEC line 101, and operate as an integrated television reception system.

  In the cooperative operation mode, the power of the set-top box 11 and the monitor 12 can be turned on / off by operating any one of the power button of the remote controller 14, the power button 110 of the set-top box 11, and the power button 120 of the monitor 12. . Details of cooperative control of the power state between the set top box 11 and the monitor 12 will be described later. In addition, correction control is performed so that appropriate image quality correction is performed in a state where the image quality correction amounts in the video / audio signal processing unit 114 of the set top box 11 and the video / audio signal processing unit 124 of the monitor 12 are combined. For example, the image quality correction amount of the entire video signal displayed on the monitor 12 may be determined, and the image quality correction amount may be distributed so as to be distributed between the set top box 11 side and the monitor 12 side. For example, the video / audio signal processing unit 114 of the set top box 11 performs image quality correction with a correction amount of about 10% of the total image quality correction amount, and the video / audio signal processing unit 124 of the monitor 12 performs correction with the remaining 90%. Image quality correction may be performed. This distribution may be changed depending on the amount of processing in the video / audio signal processing unit 114 of the set-top box 11 and the video / audio signal processing unit 124 of the monitor 12. For example, when the processing amount of the video / audio signal processing unit 114 of the set top box 11 is large, the image quality correction amount of the video / audio signal processing unit 114 is reduced to 0 or less, and the image quality correction by the video / audio signal processing unit 124 of the monitor 12 is performed. Increase the amount. Further, the distribution may be changed depending on the signal transmission state in the HDMI interface. For example, when the signal transmission attenuation amount in the HDMI interface is large, the image quality correction amount of the video / audio signal processing unit 114 is reduced to 0 or less, and the video / audio signal processing unit 124 of the monitor 12 performs image quality correction only, or the video / audio is corrected. The image quality correction amount in the signal processing unit 124 is increased. When the transmission attenuation amount in the HDMI interface is large, the image quality correction may be performed more strongly by performing image quality correction with the same correction amount in both video and audio signal processing units.

  When a menu display request signal is transmitted from the remote controller 14 to the remote control light receiving unit 129 of the monitor 12, the request signal is transmitted as a CEC command to the set top box 11 via the CEC line 101, and the set top box 11 receives the CEC. Create a menu screen in response to a command. The image signal of the menu screen is combined with the uncompressed video signal and transmitted to the monitor 12 through the TMDS line 103. As a result, the menu screen of the set top box 11 is displayed on the monitor 12. When the user operates the menu screen displayed using the remote controller 14, the control microcomputer 123 of the monitor 12 generates a process corresponding to the type of operation. Thereby, the functions of the set top box 11 and the monitor 12 are controlled simultaneously. For example, when an operation for image quality adjustment such as contrast adjustment or brightness adjustment is selected on the menu screen by the remote controller 14, the control microcomputer 123 uses the CEC line 101 as a CEC command for image quality adjustment. To the set top box 11. As a result, the control microcomputer 113 of the set top box 11 controls the video / audio signal processing unit 123 in response to the CEC command to perform the desired image quality adjustment. Further, the image quality adjustment may be performed in cooperation with the video / audio signal processing unit 124 of the monitor 12 as described above. Further, when the sound volume adjustment from a speaker (not shown) is selected from the menu screen, the control microcomputer 123 of the monitor 12 does not transmit the remote control signal as the CEC command to the set top box 11 as described above, and the monitor 12 video / audio signal processing units 124. Thereby, the audio volume from the speaker of the monitor 12 is adjusted to a desired value according to the remote control signal. As described above, in the cooperative operation mode, it is determined whether the control is performed on the set top box 11 side or the monitor 12 side according to the type of the command from the remote controller, and the CEC command issuance is required according to the determination. No is controlled.

  Furthermore, in this embodiment, a low-delay display mode for games is provided. The video / audio signal processing units 123 and 124 perform, for example, a frame rate conversion process for increasing the number of frames per unit time of the input video signal and a scaling process for enlarging / reducing the video signal. When the frame rate conversion process or the scaling process is performed, the timing of the video displayed on the monitor 12 may be delayed by, for example, about several tens to several hundreds ms from the timing of the input video signal. This low-delay display mode mode for games, for example, reduces the delay of the display video as described above by interrupting such processing (particularly frame rate conversion processing). For example, when a game device is connected to the set top box 11 side, if the game low delay display mode is set to active on the menu screen, the video / audio signal processing unit 114 of the set top box 11 is controlled to the low delay display mode. At the same time, the video / audio signal processing unit 124 of the monitor 12 is controlled to the low delay display mode by using the CEC vendor command. As described above, the present television receiving system can be operated as if it is a single device, although it is constituted by the set top box 11 and the monitor 12.

  Note that when the cooperative authentication between the set top box 11 and the monitor 12 is not established, the set top box 11 and the monitor 12 operate independently. For example, the monitor 12 does not transmit a remote control signal from the remote controller 14 to the set top box 11 side, and controls only the monitor 12 by the internal control microcomputer 123.

  Here, a power management method during the cooperative operation of the set top box 11 and the monitor 12, that is, a power matching control operation will be described. This power match control operation is permitted when the authentication based on the authentication command as described above is successful, that is, executed only when the mode is shifted to the cooperative operation mode.

  During the cooperative operation, both the set-top box 11 and the monitor 12 need to be turned on / off. However, depending on the control method, there is a mismatch in the power state such that one is turned on and the other is turned off. It may interfere with the cooperative operation. To avoid this, it is desirable that one of the devices manages both power sources. In the configuration of this embodiment, there are the following three methods for starting the power supply. (1) Press the power SW 110 of the set top box 11. (2) A power ON signal is transmitted from the remote control 14 to the remote control light receiving unit 129 of the monitor 12. (3) Press the power SW 130 of the monitor 12.

  First, (1) will be described with reference to the CEC command flow of FIG. When the power SW 110 of the set top box 11 is pressed, the set top box 11 issues a CEC vendor command 411 that instructs the monitor 12 to turn on the power. Thereafter, the set-top box 11 issues a CEC vendor command 412 for inquiring of the power state to the monitor 12. Upon receiving the CEC vendor command 413 indicating the power state “power ON” from the monitor 12, the set-top box 11 shifts its power source to the ON state.

  Next, (2) will be described with reference to the CEC command flow of FIG. When the remote control light receiving unit 129 receives the power ON signal from the remote controller, the monitor 12 issues a CEC vendor command 414 indicating that the remote control signal for instructing the power ON to the set top box 11 has been received. The set top box 11 issues a CEC vendor command 411 that instructs the monitor 12 to turn on the power. Thereafter, the set-top box 11 issues a CEC vendor command 412 for inquiring of the power state to the monitor 12. Upon receiving the CEC vendor command 413 indicating the power state “power ON” from the monitor 12, the set-top box 11 shifts its power source to the ON state.

  Next, (3) will be described with reference to the CEC command flow of FIG. When the power button 130 is pressed, the monitor 12 issues a CEC vendor command 415 indicating that the power button has been pressed to the set top box 11. The set top box 11 issues a CEC vendor command 411 that instructs the monitor 12 to turn on the power. Thereafter, the set-top box 11 issues a CEC vendor command 412 for inquiring of the power state to the monitor 12. Upon receiving the CEC vendor command 413 indicating the power state “power ON” from the monitor 12, the set-top box 11 shifts its power source to the ON state.

  That is, even when the power button 130 provided on the monitor 12 is pressed or when a power ON signal is received from the remote controller, the monitor 12 does not immediately turn on the power, but gives an instruction to turn on the power from the set top box. Wait and turn on the power. Further, the set top box 11 confirms that the monitor 12 has shifted to the power ON state, and then shifts itself to the power ON state. In this way, the power supply state mismatch can be avoided by centrally managing the monitor 12 including the power state of the monitor 12 in which the set top box 11 operates in cooperation. Here, the transition to the power-on has been described, but the transition to the power-off is the same, and can be explained by replacing “power-on” in the above description with “power-off”.

  As described above, in the present embodiment, the set top box 11 and the monitor 12 each receive an authentication command associated with each device from the connection destination device and perform authentication. Device cooperation is permitted. As a result, the cooperative operation can be performed between these devices only when the specific devices that are capable of the cooperative operation are connected to each other, and the cooperative operation can be satisfactorily performed in such a television reception system. In addition, this cooperative operation can eliminate the mismatch of the power states of the set-top box 11 and the monitor 12, and can eliminate excessive power consumption and malfunction of the cooperative operation.

  In the description of the above embodiment, the cooperative operation is permitted when the authentication is successful in both the set top box 11 and the monitor 12, but the cooperative operation is performed when the authentication is performed by only one of the devices. May be permitted. This authentication is preferably performed at least on the monitor side. Further, although the embodiment of the present invention has been described by taking the television receiving system as an example, the present invention is not limited to this, and the present invention is not limited to the above-described device that outputs a video signal and the system that displays the video by receiving the device. It goes without saying that it applies.

  Next, a second embodiment of the present invention will be described. FIG. 3 shows an example of the second embodiment according to the present invention. In this embodiment, an audio amplifier device 33 is inserted between the set top box 11 of the first embodiment and the monitor 12 via an HDMI interface. This audio amplifier device is connected to, for example, a plurality of speakers, and outputs sound from the plurality of connected speakers in cooperation with the speaker originally provided on the monitor 12 or instead of the speaker of the monitor 32. It is. The set top box 31 and the monitor 32 shown in FIG. 3 are the same as the set top box 11 and the monitor 12 shown in FIG.

  In FIG. 3, the audio amplifier device 33 receives the TMDS signal from the set top box 31 by the TMDS receiver 336, outputs it as it is from the TMDS transmitter 335, extracts the audio signal multiplexed on the TMDS signal, and controls the microcomputer. The audio processing unit 334 performs processing under the control from 333. The audio amplifier device 33 acquires the EDID data of the monitor 32 via the DDC interface, and reflects the physical address and the video format information corresponding to the monitor 32 on the EDID 327. CEC command transmission / reception with the set top box 31 and the monitor 32 is performed via the CEC interface 321.

  The difference between the present embodiment and the first embodiment is that the set top box 31 directly acquires the EDID of the monitor 32 because it is connected to the audio amplifier device 33 between the set top box 31 and the monitor 32. It is a point that cannot be done. However, even with such a connection configuration, in the present embodiment, the EDID of the monitor 32 is temporarily stored in the audio amplifier device 33 and transmitted to the set top box 31 via the CEC interface. The top box 31 can acquire the EDID of the monitor 32. Thereby, since the cooperative authentication process between the set top box 31 and the monitor 32 is realized by the CEC vendor command flow described with reference to FIG. 2, the cooperative operation can be realized even in a connection state in which the EDID cannot be directly acquired.

FIG. 4 is a diagram illustrating Example 1 of the present invention. The figure explaining the cooperation authentication command flow of Example 1 of this invention The figure explaining Example 2 of this invention The figure explaining the power supply starting command flow of Example 1 of this invention

Explanation of symbols

11 ... set top box 12 ... monitor 14 ... remote control 101 ... HDMI cable CEC line 102 ... HDMI cable DDC line 103 ... HDMI cable TMDS line 110 ... set top Box power switch
111... Set-top box CEC interface 112... Set-top box DDC interface 113... Set-top box control microcomputer 114... Set-top box video / audio signal processor 115. TMDS transmitter 118 ... set top box tuner 120 ... monitor power switch
121 ... Monitor CEC interface 123 ... Monitor control microcomputer 124 ... Monitor video / audio signal processor 126 ... Monitor TMDS receiver 127 ... Monitor EDID
128: Monitor image display unit 129: Monitor remote control reception unit 211 ... EDID lead 212 ... Command 213 ... Command 214 ... Command 215 ... Command 31 ... Set top Box 32 ... Monitor 34 ... Remote control 301 ... HDMI cable CEC line 302 ... HDMI cable DDC line 303 ... HDMI cable TMDS line 310 ... Set-top box power switch
311 ... CEC interface 312 of the set top box ... DDC interface 313 of the set top box ... Control microcomputer 314 of the set top box ... Video / audio signal processing unit 315 of the set top box ... Set top box TMDS transmitter 318 ... set top box tuner 320 ... monitor power switch
321: Monitor CEC interface 323: Monitor control microcomputer 324: Monitor video / audio signal processing unit 326: Monitor TMDS receiver 327: Monitor EDID
328: Monitor video display unit 329: Monitor remote control receiver 331: Audio amplifier device CEC interface 333: Audio amplifier device control microcomputer 334: Audio amplifier device video / audio signal processing Part 335: TMDS transmitter 336 of voice amplifier device ... TMDS receiver 337 of voice amplifier device ... EDID of voice amplifier device
338: Video display unit 339 of audio amplifier device Remote control receiving unit 411 of audio amplifier device CEC vendor command 412 instructing power ON CEC vendor command 413 inquiring power status CEC vendor command 414 indicating the state “power ON”... CEC vendor command 415 indicating that a remote control signal indicating power ON has been received CEC vendor command indicating that the power button of the monitor has been pressed

Claims (9)

A monitor device for displaying video; and a video processing device that performs predetermined processing on the input video signal and outputs the video signal to the monitor device via a predetermined interface, the monitor device and the video processing device In a video display device configured with a separate casing,
The monitor device is provided with a first power button, and the video processing device is provided with a second power button,
When the first power button provided on the monitor device is pressed, the power of the monitor device and the video processing device is controlled so that both power states are equal,
When the second power button provided in the video processing device is pressed, the power of the video processing device and the monitor device are controlled so that both power states are equal.
A video display device characterized by that.   2. The video display device according to claim 1, wherein the monitor device and the video processing device can be operated by operating a third power button provided on a remote control device for operating either the monitor device or the video processing device. The video display device is characterized in that the power source of the video is controlled so that the power status of both is equal.   3. The video display device according to claim 2, wherein the video processing device responds to a power control command based on an operation of any one of the first, second, and third power buttons. And controlling the power supply state of the monitor device based on the acquired power supply information. A monitor device for displaying video; and a video processing device that performs predetermined processing on the input video signal and outputs the video signal to the monitor device via a predetermined interface, the monitor device and the video processing device In a video display device configured with a separate casing,
The monitor device has a first power button, the video processing device has a second power button, and a remote control device for operating either the monitor device or the video processing device has a third power source. Each button is provided,
Even if any one of the first power button, the second power button, and the third power button is operated, the monitor device is configured so that the power states of the monitor device and the video processing device are equal. And a video display device, wherein a power source of the video processing device is controlled. A monitor device for displaying video; and a video processing device that performs predetermined processing on the input video signal and outputs the video signal to the monitor device via a predetermined interface, the monitor device and the video processing device In a video display device configured with a separate casing,
A first power button provided on the monitor device; a second power button provided on the video processing device; and a remote control device for operating either the monitor device or the video processing device. A third power button and a control unit provided in the video processing device,
The control unit interlocks the power of the monitor device and the power of the video processing device even when any of the first power button, the second power button, and the third power button is operated. A video display device characterized by being controlled. The video display device according to claim 5, wherein the control unit includes:
When a power-off operation is performed on any of the first power button, the second power button, and the third power button, either the power of the monitor device or the power of the video processing device Control both power supplies so that the power is also turned off,
When a power-on operation is performed on any of the first power button, the second power button, and the third power button, either the power of the monitor device or the power of the video processing device The video display apparatus is characterized in that both power supplies are controlled so as to be turned on. A monitor device for displaying video; and a video processing device that performs predetermined processing on the input video signal and outputs the video signal to the monitor device via a predetermined interface, the monitor device and the video processing device In a video display device configured with a separate casing,
Between the monitor device and the video processing device is configured to be able to transmit and receive information on the power state of each device via the interface,
A video display device, wherein power supplies of the monitor device and the video processing device are controlled so that power states of the monitor device and the video processing device coincide with each other.   8. The video display device according to claim 7, wherein when one of the monitor device and the video processing device is turned on, the other device is turned on, and when one device is turned off, the other device is turned on. The video display device is characterized in that the power of the camera is turned off.   8. The video display device according to claim 7, wherein an authentication command associated with each device can be transmitted and received between the monitor device and the video processing device via the interface, and in either or both of the devices. The video display device is characterized in that control of the power supply is permitted when the authentication command is authenticated.

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