JP2008145679A - Display apparatus and av system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display apparatus which is connected to external devices such as an AV amplifier and a recorder, in which power supply to a backlight and the external devices can be limited or stopped on the basis of content information of a category or the like and operation states of the respective devices. <P>SOLUTION: A TV apparatus 30 is connected to a recorder 10 and an AV amplifier 20 through a HDMI cable 40. The TV apparatus includes a content information acquisition means 306a for acquiring content information of the category or the like, an operation state detection means 306b for detecting operation states of the TV apparatus 30 and the external devices, and an operation state control means 306c for controlling the operation states of the TV apparatus 30 and the external devices on the basis of the content information and operation states of respective devices. For example, the operation state control means 306c performs such control that power supply to a backlight 316b is limited or stopped when a pertinent content is judged to be a content having only sounds or having sounds mainly. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device and an AV system, and more particularly to a display device including a digital interface such as HDMI (High Definition Multimedia Interface) and an AV system including the device.

  With the recent digitalization of television broadcast receivers, the number of channels that can be viewed has increased, and it has become possible to receive digital radio broadcasts and data broadcasts. In addition, as the screen size of televisions has increased, the connection methods between televisions and external devices have diversified, making it possible to link the connected devices.

  IEEE 1394, which is a high-speed serial bus, is known as one of digital interfaces for digitally connecting AV devices such as televisions and recorders. Even in a standby (standby) state, the recording apparatus connected by the IEEE 1394 supplies power to related circuits of the IEEE 1394 interface so that it can respond to a power-on request by an AVC command based on the IEEE 1394 standard. In the case of IEEE 1394, since a broadband transmission path is used and the communication protocol for realizing the control by the AVC command is complicated, in most cases, the main CPU needs to be energized and the standby power consumption is about 20 W. .

  Also, 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 have been used for connection between devices, but HDMI requires only one cable, and control signals support bidirectional transmission. By relaying a control signal from an output device such as an STB 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 a recording apparatus that supports the CEC (Consumer Electronics Control) function of HDMI, in order to be able to respond to the CEC power-on request even in the standby state, the CEC related circuits are energized in the same manner as in the above-described IEEE 1394. There is a need. However, in the case of CEC, a narrow-band transmission line is used, and the electrical control method and the communication protocol are simple. Therefore, the power consumption during standby is only about 1 W, compared with the above-mentioned IEEE 1394 about 20 W. Power consumption is greatly reduced.

  In an AV device equipped with such a digital interface, reducing the power consumption becomes an important issue as the screen of a television becomes larger. For example, when the digital radio broadcast described above is received, extra power is consumed because the backlight is turned on even though no video is displayed.

On the other hand, in Patent Document 1, the channel selection, volume, mode, and the like at the time of radio reception are displayed on an image display device such as a liquid crystal television. There is disclosed a liquid crystal television receiver that is not lit.
JP-A-1-30377

However, since the mutual connection status between the TV and the external connection device could not be properly recognized, it was necessary to switch the setting of the energy saving setting and the linkage operation between the connection devices individually for each connection device. It was.
In addition, there are an increasing number of cases in which liquid crystal televisions, recorders, and the like are used as an AV system by HDMI connection. In this case, the number of cases where power is turned on by a centralized switch is increasing. However, there are many components and connected devices that are not used depending on the usage situation, leading to wasteful power consumption.

  According to the invention described in Patent Document 1 above, the backlight can be turned off in accordance with the radio function built in the liquid crystal television main body. Thus, lighting / non-lighting of the backlight could not be controlled according to the type of the external input signal. Therefore, even when the external input is only an audio signal, the LCD TV cannot turn off the backlight, and the backlight stays on and consumes wasted power even though no video is displayed. Was.

The present invention has been made in view of the above circumstances, and is connected to an external device such as an AV amplifier or a recorder. Based on content information such as a genre and the operating state of each device, the backlight, the external device, etc. It is an object of the present invention to provide a display device that can be controlled so as to limit or stop power supply to the TV and an AV system including the display device.
More specifically, a liquid crystal television and an external device such as an AV amplifier or a recorder are connected via an HDMI cable and an optical audio cable, and audio-only content or audio-based content is determined from content information such as genre. Reduce power consumption in these parts, which account for most of the operating power in AV systems, by individually controlling the power supply to the LCD TV's backlight and external devices based on the results and the operating status of each device It aims to plan.

  In order to solve the above-described problem, a first technical means of the present invention is a display device including a connection unit that connects to an external device, a content information acquisition unit that acquires content information related to content, a display device, An operation state detecting means for detecting an operation state of the external device, an operation for controlling the operation state of the display device and / or the external device based on the content information acquired by the content information acquisition means and the detection result by the operation state detection means. And a state control means.

  According to a second technical means, in the first technical means, the operation state control means determines that the content is an audio-only content or an audio-based content based on the content information acquired by the content information acquisition means. In this case, control is performed such that power supply to the backlight provided in the display device is limited or stopped.

  According to a third technical means, in the second technical means, the operation state control means determines, based on a genre included in the content information, whether the content is an audio-only content or an audio-based content. It is a feature.

  The fourth technical means includes a radio tuner for receiving radio broadcasting in the first technical means, and the operation state control means restricts or stops power supply to the backlight provided in the display device when the radio tuner is used. It is characterized by controlling as follows.

  The fifth technical means includes, in the first technical means, video display setting means for setting whether or not to display the video included in the content, and the operation state control means does not display the video by the video display setting means. When set to, control is performed so as to limit or stop power supply to the backlight included in the display device.

  According to a sixth technical means, in any one of the second to fifth technical means, the operation state control means controls the power supply to the liquid crystal module included in the display device to be limited or stopped. It is a thing.

  The seventh technical means is the technical means of any one of the second to sixth technical means, when the operation state control means determines that the power of the external device is turned on and the external device is not operating, to the external device. The power supply is controlled so as to be limited or stopped.

  The eighth technical means includes OSD processing means for OSD displaying a message for confirming whether the power of the external device may be turned off in the seventh technical means, and the operating state control means is controlled by the OSD processing means. When power-off is confirmed, control is performed such that power supply to an external device is restricted or stopped.

  A ninth technical means is any one of the first to eighth technical means, wherein the external device is a playback device for reproducing a video / audio signal, a recording device for recording the video / audio signal, one or more speakers, It is one or more of the connected AV amplifiers.

  A tenth technical means is any one of the first to ninth technical means, wherein the connection means includes an HDMI terminal for performing connection according to the HDMI standard, and the operation state detection means is provided via the HDMI terminal. The CEC command for detecting the operation state of the external device is transmitted to the external device, and the operation state control means externally sends the CEC command for limiting or stopping the power supply to the external device via the HDMI terminal. It is characterized by being transmitted to a device.

  The eleventh technical means is one or more connected to the display device in any one of the first to tenth technical means directly to the HDMI terminal of the display device or indirectly via the HDMI terminal of another external device. The external system is controlled so that power supply to the external device is restricted or stopped by a predetermined CEC command from the display device. It is.

  A twelfth technical means is an AV system including a display device for displaying and outputting a video signal and a recording device capable of recording / reproducing contents, and the display device and the recording device are HDMI-connected, Content information acquisition means for acquiring content information related to content, operation state detection means for detecting operation states of the display device and the recording device, content information acquired by the content information acquisition means, and detection results by the operation state detection means Operating state control means for controlling the operating state of the display device and / or the recording device based on the operating state control means, wherein the operating state control means transmits a CEC command for controlling the operating state of the display device. It is.

  According to the present invention, in a display device connected to an external device such as an AV amplifier or a recorder, based on content information such as a genre and the operating state of each device, the backlight included in the display device, or the connected external device Therefore, the power consumption of each device constituting the AV system can be reduced.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a display device of the present invention and an AV system including the display device will be described with reference to the accompanying drawings. In the embodiment of the present invention, CEC (Consumer Electronics Control) included in the HDMI standard is used as a representative example.

  The display device of the present invention is connected to an external device such as an AV amplifier or a recorder via an HDMI cable or an optical audio cable, determines audio-only content or audio-based content from content information such as a genre, and the determination result and each Based on the operating state of the device, the backlight provided in the display device and the power supply to the external device can be individually controlled. A CEC command is used for exchange between the display device and the external device. This CEC is a control protocol standardized by HDMI, and a CEC command that is a control signal based on the protocol is exchanged between devices.

  FIG. 1 is a conceptual diagram showing a configuration example of an AV system according to an embodiment of the present invention. In the figure, 10 is a recorder, 20 is an AV amplifier, 30 is a television device, 40 is an HDMI cable, and 50 is an optical audio cable. The television apparatus 30 is connected to the AV amplifier 20 via the HDMI cable 40 and the optical audio cable 50, and the AV amplifier 20 is connected to the recorder 10 via the HDMI cable 40. The recorder 10 and the AV amplifier 20 correspond to the external device of the present invention, and the television device 30 corresponds to the display device of the present invention.

  FIG. 2 is a diagram showing a connection example of the AV system according to the present embodiment. In this example, the display device TV A is arranged in the first layer, the external devices (AV amplifier 1, recorder 1) directly connected to the TV A are arranged in the second layer, and the third and subsequent layers are also included. Similarly, a tree-structured network is configured in which external devices that are directly connected to external devices in the hierarchy are arranged in the next layer. In such a network configuration, the television A can transmit a CEC command by designating an address of a specific external device constituting the neckwork.

  Here, a logical address and a physical address in CEC will be briefly described. First, the logical address can be handled from 0 to 15 in the current version of the standard in HDMI CEC, and is the only name in the HDMI network. This logical address differs depending on the type of external device.

  The physical address is the only name in the HDMI network, but is automatically adjusted when an external device is added to or disconnected from the HDMI network. The physical address has a five-layer address and is composed of a unique number n in the same layer, n. n. n. Expressed in n form. When the hierarchy of the external device directly connected to the display device is the first hierarchy, the external device connected to the first hierarchy device becomes the second hierarchy, and the hierarchy number is increased as the distance from the display device increases. The above format n. n. n. It is written such that the layer number increases as it goes from n at the left end of n to the right.

  For example, the display device is a root device and has a physical address of “0.0.0.0”. When two external devices are directly connected to this display device, the physical address of the first external device is “1.0.0.0”, and the physical address of the second external device is It is written as “2.0.0.0”. When three external devices are connected to the second external device, the respective physical addresses are “2.1.0.0”, “2.2.0.0”, “2.3.0”. .0 ".

  By using a CEC command having such a logical address and a physical address, even if a plurality of output devices are connected, a specific one can be specified and transmitted.

  In FIG. 2, the HDMI input of the TV A and the HDMI output of the AV amplifier 1 are connected by an HDMI cable 40, and the optical audio output of the TV A and the optical audio input of the AV amplifier 1 are connected by an optical audio cable 50. Further, the HDMI output of the recorder 2 and the HDMI input of the AV amplifier 1 are connected by the HDMI cable 40. As a result, the television A, the AV amplifier 1 and the recorder 2 are in a state where they can be mutually recognized. A detailed example of the main part of an AV system composed of the TV A, the AV amplifier 1 and the recorder 2 (device surrounded by a dotted frame in the figure) is shown in FIG. 3 to be described later.

  The HDMI cable 40 includes a TMDS (Transition Minimized Differential Signaling) line (digital signal line) 41 for transmitting a video / audio signal, which is a digital signal, in a differential manner, and a control signal (CEC command) shared between devices. ) And a CEC line 42 which is a bi-directional bus for transmitting. In addition, the HDMI cable 40 includes a DDC line (not shown) used for transmission of EDID (Extended Display Identification Data), HDCP authentication, and the like.

  FIG. 3 is a block diagram for explaining a configuration example of a main part relating to HDMI connection of an AV system to which the present invention can be applied, in which the output device 10, the repeater device 20, and the display device 30 are connected. Is shown. The output device 10 is, for example, a DVD recorder, HDD recorder, DVD player, D-VHS recorder, digital video camera or the like having an HDMI output terminal. The repeater device 20 is an AV amplifier having an HDMI input terminal and an output terminal. The display device 30 is a liquid crystal television or monitor having an HDMI input terminal. If the repeater device 20 such as an AV amplifier has a plurality of HDMI input terminals, a plurality of output devices 10 can be connected, and the input line can be switched by the selector function of the AV amplifier.

  In the display device 30 according to the present invention, a CEC command transferred via the CEC line 42 in order to detect the operation state of the repeater device 20 and the output device 10 and to control the operation state of the repeater device 20 and the output device 10. 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 30 and the connected device by exchanging information between the devices using the CEC command.

Hereinafter, a configuration of main parts related to HDMI connection of the output device 10, the repeater device 20, and the display device 30 will be described.
The output device 10 includes an HDMI transmitter 11, a HOST CPU 12, a front microcomputer 13, and a CEC I / F 14. The HDMI transmitter 11 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 12 includes an HDMI controller and controls the operation of the HDMI transmitter 11.

  The CEC I / F 14 connects the CEC line 42 in the HDMI cable 40 and enables bidirectional communication of CEC commands with the repeater device 20. The operation of the CEC I / F 14 is controlled by the front microcomputer 13 including a CEC controller, and can control devices connected by HDMI using a 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 12 controls the entire apparatus. The front microcomputer 13 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 13 is operating even when the HOST CPU 12 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, a CEC I / F 25, and an optical audio receiving unit 26. The repeater device 20 receives the stream transferred from the output device 10 by the HDMI receiver 21, further transmits it from the HDMI transmitter 22, and transfers it to the display device 30. Further, the CEC I / F 25 connects the CEC line 42 to the output device 10 and the CEC line 42 to the display device 30.

  The optical audio reception unit 26 is connected to the optical audio transmission unit 35 of the display device 30 via the optical audio cable 50, receives an audio signal transmitted from the optical audio transmission unit 35, and receives the audio signal from the repeater device 20. Output from one or more speakers connected to.

  The HOST CPU 23 and the front microcomputer 24 have the same functions as those of the output device 10 described above. The HOST CPU 23 controls the HDMI receiver 21 and the HDMI transmitter 22 and also controls the entire device. The front microcomputer 24 includes a CEC controller and monitors CEC commands transferred from the CEC line 42.

  The display device 30 includes a HOST CPU 31 incorporating an HDMI receiver, a monitor microcomputer 32, a CEC I / F 33, a light receiving unit 34, and an optical audio transmitting unit 35. The display device 30 receives the stream transferred by the repeater device 20 by the HOST CPU 31 having a built-in HDMI receiver. The HDMI receiver may be separated from the HOST CPU 31. Further, the CEC line 42 is connected to the repeater device 20 by the CEC I / F 33.

  The optical audio transmission unit 35 is connected to the optical audio reception unit 26 of the repeater device 20 via the optical audio cable 50, transmits an audio signal from the optical audio transmission unit 35 to the optical audio reception unit 26, and transmits the audio signal to the repeater. Output from one or more speakers connected to the device 20.

  The HOST CPU 31 incorporates an HDMI receiver and controls the entire apparatus. The monitor microcomputer 32 includes a CEC controller and monitors the CEC command transferred from the CEC line 42. The monitor microcomputer 32 controls the light receiving unit 34 that receives a remote control signal from the remote control device R. Even when the HOST CPU 31 is down in the standby mode of the apparatus, the monitor microcomputer 32 operates and maintains a state in which transmission / reception of CEC commands and reception of remote control signals are possible.

  FIG. 4 is a block diagram for explaining a configuration example of a main part when the display device 30 of the present invention is applied to a television device. In the figure, a display device (hereinafter referred to as a television device) 30 is HDMI-connected to the repeater device (hereinafter referred to as AV amplifier) 20 and the output device (hereinafter referred to as recorder) 10 shown in FIG. 3, and is further connected to the AV amplifier 20 so as to be able to output sound. Is done.

  The TV apparatus 30 includes a TV tuner 301 that is a built-in tuner that selects and demodulates a digital TV broadcast signal, a radio tuner 302 that selects and demodulates a digital radio broadcast signal, a network tuner 303 that can be connected to a network, A demultiplexer 304 that extracts EPG data from the broadcast signal demodulated by any of the TV tuner 301, radio tuner 302, and network tuner 303 and separates the demodulated data, and video data and / or audio of the separated broadcast signal. And a decoder 305 for decoding data.

  The television apparatus 30 also includes a system control unit 306 that controls the entire system, a bus arbitration unit 307 that receives a bus use request from the system control unit 306, and an instruction from the system control unit 306. And an OSD signal processing unit 313 that generates and outputs various OSD signals. The bus arbitration unit 307 gives permission to use immediately when there is a request to use one bus at a time, and when there are a plurality of use requests at a time, that is, when there are conflicting requests for using the bus, The use permission of the bus is given according to the priority set in the control unit 306 and the like.

  The television apparatus 30 includes an optical audio transmission unit (optical audio output) 308 that transmits an audio signal to an external device (AV amplifier 20), an external input I / F (external input) 309 that accepts an external input, and an HDMI device ( HDMI input I / F (HDMI input 1, HDMI input 2) 310, 311 for receiving input from the recorder 10, the AV amplifier 20, and the like are provided. The HDMI I / F includes the above-described HDMI receiver, CEC I / F, and the like. An input switching menu is prepared to switch between these external input, HDMI input, and tuner input, and is held in a memory 318 connected to the system control unit 306. The input switching menu held in the memory 318 is OSD-displayed from the OSD signal processing unit 313 according to a user operation, and can be switched to a user-desired input.

  Note that the television apparatus 30 is connected to the AV amplifier 20 and the recorder 10 through the HDMI input I / F 310, and can transmit and receive CEC commands between the connected devices via the CEC line 42. The audio signal is transmitted to the AV amplifier 20 by being connected to the AV amplifier 20.

  The image processing unit 312 appropriately performs video signal conversion processing such as noise reduction, scaling, and IP conversion as necessary. In addition, image quality adjustment such as image quality enhancement correction processing and γ correction processing is appropriately performed. In the image signal conversion process, the frame memory 315 is used to perform various three-dimensional image processes. The device driving unit 314 controls the display device 316 such as a liquid crystal panel to display the video signal output from the image processing unit 312 and / or the OSD signal output from the OSD signal processing unit 313 on the display device 316. . The display device 316 includes a liquid crystal module 316a including a backlight 316b.

  The audio processing unit 319 performs audio output from the speaker 320 after performing predetermined audio processing on the audio signal. Further, the audio processing unit 319 may perform predetermined audio processing on the audio signal and then transmit the audio signal from the optical audio transmission unit 308 to the AV amplifier 20 and output the audio from a speaker included in the AV amplifier 20.

  In addition, the television device 30 is provided with an infrared light receiving unit 317 that receives an infrared signal from a remote controller (hereinafter referred to as a remote controller) R operated by a user.

  The system control unit 306 includes content information acquisition unit 306a, operation state detection unit 306b, operation state control unit 306c, and operation mode setting unit 306d of the present invention. The content information acquisition unit 306 a controls the demultiplexer 304 to acquire program information included in the broadcast signal from the TV tuner 301 or program information included in the broadcast signal from the radio tuner 302. This program information includes, for example, information such as the program genre and audio component information (monaural, stereo, 5.1ch surround, etc.).

  Further, the content information acquisition unit 306a may acquire content information related to content such as a DVD or a CD that is played back by the recorder 10. This is because content information (such as a genre) stored on a DVD or CD is acquired, or a network tuner 303 is incorporated, and the title name of the DVD or CD is used as a keyword to specify a specific Web site ( For example, content information may be acquired from a music store or the like.

  The operation state detection unit 306b detects the operation state of the television apparatus 30 and uses the CEC command to detect the operation state of the external device such as the AV amplifier 20 and the recorder 10 connected via the HDMI input I / F 310. To detect. Whether the operation state detection unit 306b is turned on (off) from each external device (AV amplifier 20, recorder 10) connected via the HDMI input I / F 310 by transmitting a CEC command, for example. Status information indicating the state of operation, such as whether the operation is in progress, is acquired. Further, the operation state detection unit 306b determines whether or not “Ack” is returned from each external device when the CEC command is transmitted. If the response signal “Ack” is returned, it is determined that the external device is connected. On the other hand, if “Ack” is not returned, it is determined that the external device is not connected.

  The operation state control unit 306c operates based on the content information acquired from the program information acquisition unit 306a and the detection result of the operation state detection unit 306b, and the operation state of the television apparatus 30 and / or the external device (AV amplifier 20, recorder 10). To control. In addition, when the television apparatus 30 controls the operation state of the external device, the CEC command is used.

  Specifically, when the operation state control unit 306c determines that the content is audio-only content or audio-based content based on the content information acquired by the program information acquisition unit 306a, the television apparatus 30 Control is performed so as to limit or stop power supply to the backlight 316b provided. Here, the operation state control unit 306c may determine whether the content is audio-only content or audio-based content based on the genre included in the content information. For example, if the genre is “sports”, “movie / drama”, “entertainment”, “animation”, etc., the content is mainly composed of both video and audio, while “music”, “news”, etc. If so, it is determined that the content is mainly audio. These genre determinations may be determined in advance based on user settings or factory shipment settings and stored in the memory 318.

  For example, when the genre of the content is “music” from the content information acquired by the content information acquisition unit 306a and the backlight 316b is turned on from the detection result of the operation state detection unit 306b, the operation state control unit 306c. Controls to limit or stop the power supply to the backlight 316b by performing only audio reproduction. Furthermore, the power supply to the liquid crystal module 316a other than the backlight 316b may be limited or stopped.

  Further, since the operation state control unit 306c only needs to reproduce the sound when the radio tuner 302 is used, the operation state control unit 306c controls the power supply to the backlight 316b to be limited or stopped as described above. Also in this case, the power supply to the liquid crystal modules 316a other than the backlight 316b may be limited or stopped.

  Further, when the recorder 10 has a music playback function such as a music CD playback function or an MP3 playback function, only the sound from the recorder 10 needs to be output. For this reason, when the operation state detection unit 306b detects that music is being played back by the recorder 10, the operation state control unit 306c may perform control so as to limit or stop power supply to the backlight 316b. Good. Also in this case, the power supply to the liquid crystal modules 316a other than the backlight 316b may be limited or stopped.

  Further, the system control unit 306 includes an operation mode setting unit 306d corresponding to the video display setting unit of the present invention for setting whether to display the video included in the content. When the video is set to non-display by the operation mode setting unit 306d, only the sound of the content is reproduced regardless of the content genre, and the power supply to the backlight 316b is limited or stopped as described above. To control. Also in this case, the power supply to the liquid crystal modules 316a other than the backlight 316b may be limited or stopped.

  FIG. 5 is a diagram showing an example of an operation mode setting table for each genre set by the operation mode setting means 306d. This genre-specific operation mode setting table can set whether to display an image or whether to output an amplifier for the content genre names “movie / drama”, “music”, “news”, etc. it can. This table is created by the operation mode setting means 306d based on user settings or factory shipment settings, and stored in the memory 318.

  According to the operation mode setting table shown in FIG. 5, when the content genre is “movie / drama”, the video display is “O” and the amplifier output is “O”, so both the video display and the amplifier output are executed. . When the content genre is “music”, the video display is “×” and the amplifier output is “◯”, so that only the audio is output from the AV amplifier 20 without displaying the video. When the content genre is “news”, since the video display is “×” and the amplifier output is “×”, only the audio is output from the speaker 319 of the television without video display and amplifier output.

  The operation state control unit 306c refers to the operation mode setting table and controls the power supply to the backlight 316b, the liquid crystal module 316a, and the external device (AV amplifier 20, recorder 10) to be limited or stopped. In the above example, when the genre is “music”, the video is not displayed, so that the power supply to the backlight 316b is controlled or stopped. Here, in order to output the amplifier, the power supply of the AV amplifier 20 may be kept on, and a CEC command may be transmitted to the recorder 10 to limit or stop the power supply to the recorder 10. However, when the recorder 10 is playing back a DVD or CD, the recorder 10 is in use, so the power of the recorder 10 remains on.

  In addition, in the case of the content of the genre “news”, since the video is not displayed, the power supply to the backlight 316b is controlled to be limited or stopped. Further, since the amplifier output is not performed, a CEC command may be transmitted to the AV amplifier 20 and the recorder 10 to limit or stop power supply to the AV amplifier 20 and the recorder 10.

  As described above, the operation state control unit 306c turns off the power of the external device when it is determined from the detection result of the operation state detection unit 306b that the power of the external device is turned on and the external device is not operating. You may control.

  The content includes content that does not place importance on realism, such as news programs and programs centered on interviews and readings. Whether or not to perform amplifier output is set in advance using the operation mode setting table shown in FIG. 5 for such content genres. That is, it is set whether the output destination of the audio signal is the built-in speaker 320 or the speaker included in the AV amplifier 20. When the amplifier output is not performed, the AV amplifier 20 is not used, so the power of the AV amplifier 20 is turned off. Similarly, the recorder 10 may be turned off when the power is on and not used.

  When the power of the external device is turned off, a message for confirming whether the power of the external device can be turned off may be displayed on the OSD from the OSD signal processing unit 313 which is the OSD processing means of the present invention. In this case, if the user confirms that the power is turned off for the OSD display, the operation state control unit 306c controls the power supply to the external device to be limited or stopped. If not, the external device is left on.

  As another method, the usage history of the user including the external device may be stored in the memory 318 of the television apparatus 30 and the power on / off of the external device may be determined based on the usage history. . For example, when the external device is used frequently, even if power is once supplied to the backlight 316b and the liquid crystal module 316a of the television device 30, the OSD display is performed and the power of the external device is turned off. Confirm with the user. In this way, by letting the user confirm before turning off the power of the external device, the power is not turned off without the user's knowledge, and the user is not confused.

  With the above-described configuration, as a power saving effect expected in the television device 30, when power supply to the backlight 316b is stopped (not lit), the size is approximately 132W and 45 inches in a 37 inch size (WXGA). When the power supply to the liquid crystal module 316a is stopped, it is about 6W for 37 inch size (WXGA) and about 8.76W for 45 inch full HD. Note that the power consumption of the liquid crystal module 316a does not include the power consumption of the backlight 316b.

  Furthermore, when the recorder 10 is not used at all even though the power of the recorder 10 which is an external device is turned on by the TV device 30 using the HDMI / CEC command, the power of the recorder 10 is turned off. It may be. As a result, the power saving effect expected in the recorder 10 is about 49 to 55 W in the case of a 500 GB HDD built-in digital high-definition recorder, and about 200 to 250 GB in the HDD built-in digital high vision recorder.

  In the embodiment described above, the television apparatus 30 receives a broadcast signal and acquires content information (program information) included in the broadcast signal, or content information related to DVD or CD content played back by the recorder 10. However, a TV tuner or a network tuner provided in the recorder 10 may be used.

  That is, the recorder 10 includes the content information acquisition unit 306a, the operation state detection unit 306b, the operation state control unit 306c, and the operation mode setting unit 306d. The recorder 10 receives a broadcast signal from the TV tuner, and converts the broadcast signal into the broadcast signal. The content information (program information) included is acquired, or the content information related to the content of the DVD or CD reproduced by the recorder 10 is acquired via the network. Then, when it is determined from the genre included in the content information that the content is audio-only content or audio-based content, the CEC command is transmitted from the recorder 10 to the television device 30, and the television device 30 backlight, You may control to restrict | limit or stop the electric power supply to a liquid crystal module. In this case, the audio signal is transmitted from the recorder 10 via the HDMI cable, and is output from the speaker 320 of the television apparatus 30 or the speaker connected to the AV amplifier 20.

  As described above, when the audio-based content is selected by the recorder 10, only the audio reproduction is performed, and based on the control from the recorder 10, the power source of the backlight 316 b of the television device 30, and further the liquid crystal The power source of the module 316a may be turned off. Further, in the case of an environment video, the brightness of the backlight 316b may be controlled to be lowered. These setting conditions are preferably set in advance, for example, by factory shipment settings from the manufacturer or user settings.

  Further, the AV amplifier includes a liquid crystal module or the like as a display unit, and when reproducing an audio signal (audio output signal) from the television device 30 or the recorder 10 according to audio reproduction setting conditions, Based on the control by the CEC command, the power supply of the liquid crystal module of the AV amplifier may be turned off.

  FIG. 6 is a flowchart for explaining an example of the power control method in the AV system of the present invention. In this example, an example in which program information included in a broadcast signal is acquired as content information based on an AV system in which the television apparatus 30, the AV amplifier 20, and the recorder 10 shown in FIG. 4 are connected will be described.

  First, the television apparatus 30, the AV amplifier 20, and the recorder 10 are connected (step S1), and it is determined whether or not a program is output from the television apparatus 30 (step S2). Here, when a program is output from the television device 30 (in the case of YES), the television device 30 acquires program information of the program (step S3). Further, when the program is not output from the television device 30 (in the case of NO), it is determined whether or not the program is output from the recorder 10 (step S4). Here, when the program is output from the recorder 10 (in the case of YES), the recorder 10 acquires the program information of the program (step S3). If no program is output from the recorder 10 (in the case of NO), the process returns to step S2 and is repeated.

  Next, the television apparatus 30 or the recorder 10 sets the operation mode (display / non-display of video, use / non-use of AV amplifier, etc.) corresponding to the program information acquired from the broadcast signal as the operation mode setting shown in FIG. Extraction is performed by referring to the table (step S5). Then, the television device 30 or the recorder 10 determines whether or not to set a user-preferred operation mode (step S6). For example, the operation mode setting screen may be displayed in OSD according to the user operation, and if the setting is changed by the user, it may be determined that the user-preferred operation mode is set.

  If it is determined in step S6 that the user-preferred operation mode is set (YES), the television set 30 or the recorder 10 sets the user-preferred operation mode (step S7). If it is determined in step S6 that the user-preferred operation mode is not set (NO), the operation mode extracted in step S5 is set (step S8).

  Next, the television device 30 or the recorder 10 determines whether the video is not displayed and is set to audio only (step S9). If the video device 30 is set to audio only (in the case of YES), the television device 30 is provided. Control is performed so as to limit or stop power supply to the backlight 315b (step S10). Moreover, when it is not set to only a sound in step S9 (in the case of NO), it transfers to step S11.

  Next, the television device 30 or the recorder 10 determines whether or not to output a program from the television device 30 (step S11). When a program is output from the television device 30 (in the case of YES), the power source of the recorder 10 is unnecessary. The power supply is limited or stopped (step S12). Then, the television device 30 or the recorder 10 outputs sound from the AV amplifier 20 or the speaker 319 of the television main body (step S13). In step S11, when the program is not output from the television device 30 (in the case of NO), the program is output from the recorder 10 (step S14), and unnecessary power supply such as the backlight 315b of the television device 30 is limited or stopped ( Step S15) and the process proceeds to step S13.

  As described above, according to the present invention, in a display device connected to an external device such as an AV amplifier or a recorder, based on content information such as a genre and the operating state of the external device, Since the power supply to the connected external device can be controlled or stopped, the power consumption of each device constituting the AV system can be reduced.

  More specifically, a liquid crystal television and an external device such as an AV amplifier or a recorder are connected via an HDMI cable and an optical audio cable, and audio-only content or audio-based content is determined from content information such as a genre. By controlling the backlight of the LCD TV and the power supply of the external device individually based on the result and the operating state of the external device, the power consumption is reduced in these parts that occupy most of the operating power in the AV system. be able to.

  Further, since the energy saving setting can be performed from the television side for each connected device constituting the AV system, the energy saving setting work that has conventionally been necessary for each connected device can be omitted. Further, by using the HDMI connection, the wiring between the connected devices can be simplified, and the power management of each connected device can be finely performed.

It is a conceptual diagram which shows the structural example of the AV system which concerns on one Embodiment of this invention. It is a figure which shows the example of a connection of the AV system which concerns on this embodiment. It is a block diagram for demonstrating the example of a principal part structure concerning the HDMI connection of the AV system which can apply this invention. It is a block diagram for demonstrating the example of a principal part structure when the display apparatus of this invention is applied to a television apparatus. It is a figure which shows an example of the operation mode setting table classified by genre set by the operation mode setting means. It is a flowchart for demonstrating an example of the power control method in the AV system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Output device (recorder), 11, 22 ... HDMI transmitter, 12, 23, 31 ... HOST CPU, 13, 24 ... Front microcomputer, 14, 25, 33 ... CEC I / F, 20 ... Repeater device (AV amplifier) , 21 ... HDMI receiver, 26 ... optical audio receiver, 30 ... display device (television device), 32 ... monitor microcomputer, 34 ... light receiver, 35 ... optical audio transmitter, 40 ... HDMI cable, 41 ... TMDS line, 42 ... CEC line, 50 ... Optical audio cable, 301 ... TV tuner, 302 ... Radio tuner, 303 ... Network tuner, 304 ... Demultiplexer, 305 ... Decoder, 306 ... System controller, 306a ... Content information acquisition means, 306b ... Operation State detection means, 306c... Operation state control means, 306d. 307 ... Bus arbitration unit, 308 ... Optical audio output (optical audio transmission unit), 309 ... External input, 310,311 ... HDMI input, 312 ... Image processing unit, 313 ... OSD signal processing unit, 314 ... Device Drive unit, 315, frame memory, 316, display device, 316a, liquid crystal module, 316b, backlight, 317, infrared light receiving unit, 318, memory, 319, sound processing unit, 320, speaker.

Claims (12)

A display device having a connection means for connecting to an external device,
Content information acquisition means for acquiring content information related to content, operation state detection means for detecting operation states of the display device and the external device, content information acquired by the content information acquisition means, and the operation state detection means A display device comprising: an operation state control means for controlling an operation state of the display device and / or the external device based on a detection result.   2. The display device according to claim 1, wherein the operation state control unit determines that the content is an audio-only content or an audio-based content based on the content information acquired by the content information acquisition unit. The display device is controlled so as to limit or stop power supply to a backlight included in the display device.   3. The display device according to claim 2, wherein the operation state control unit determines whether the content is audio-only content or audio-based content based on a genre included in the content information. Display device. The display device according to claim 1, further comprising a radio tuner that receives radio broadcasts,
The display device according to claim 1, wherein the operation state control means controls the power supply to a backlight included in the display device to be limited or stopped when the radio tuner is used. The display device according to claim 1, further comprising video display setting means for setting whether to display a video included in the content,
The operation state control unit controls the power supply to the backlight included in the display device to be limited or stopped when the image is set to non-display by the image display setting unit. .   6. The display device according to claim 2, wherein the operation state control unit performs control so as to limit or stop power supply to a liquid crystal module included in the display device. apparatus.   7. The display device according to claim 2, wherein when the operation state control unit determines that the power of the external device is turned on and the external device is not operating, the operation state control unit A display device that controls the power supply to be limited or stopped. 8. The display device according to claim 7, further comprising OSD processing means for OSD-displaying a message for confirming whether the external device may be turned off,
The display apparatus according to claim 1, wherein the operation state control unit controls the power supply to the external device to be limited or stopped when the OSD processing unit confirms that the power is off.   9. The display device according to claim 1, wherein the external device is connected to a playback device that plays back a video / audio signal, a recording device that records the video / audio signal, and one or more speakers. A display device comprising one or more AV amplifiers. 10. The display device according to claim 1, wherein the connection unit includes an HDMI terminal for performing connection according to the HDMI standard,
The operation state detection means transmits a CEC command for detecting the operation state of the external device to the external device via the HDMI terminal,
The display apparatus according to claim 1, wherein the operation state control unit transmits a CEC command for limiting or stopping power supply to the external device to the external device via the HDMI terminal. 11. A display device according to claim 1, and one or more external devices connected directly to an HDMI terminal of the display device or indirectly via an HDMI terminal of another external device. An AV system,
The AV system, wherein the external device is controlled such that power supply to the external device is limited or stopped by a predetermined CEC command from the display device. An AV system comprising a display device for displaying and outputting a video signal and a recording device capable of recording / reproducing content, wherein the display device and the recording device are HDMI-connected,
The recording device includes content information acquisition means for acquiring content information related to content, operation state detection means for detecting operation states of the display device and the recording device, content information acquired by the content information acquisition means, An operation state control unit that controls an operation state of the display device and / or the recording device based on a detection result by the operation state detection unit;
The AV system characterized in that the operation state control means transmits a CEC command for controlling the operation state of the display device.

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