JP5197039B2 - Display device, system, display device control method, and system control method - Google Patents

Description

The present invention relates to a display device, a system, a display device control method, and a system control method .

  Conventionally, when an external device (output device) such as a video recorder is connected to a display device such as a television to display video, the output device outputs in accordance with the display resolution (hereinafter referred to as resolution) that can be displayed on the display device. Determine the time resolution (output mode). Specifically, the output device acquires information about the displayable resolution of the display device, and determines the output resolution (output mode) according to the resolution.

  Examples of video signals that can support a plurality of resolutions include analog component signals, HDMI (High Definition Multimedia Interface) signals, and DVI (Digital Visual Interface) signals.

  In addition, as a control signal between the display device and the output device in the HDMI signal and the DVI signal, there is a DDC (Display Data Channel) signal.

  The DDC signal includes DDC1, DDC2B, DDC2AB, etc., and the communication method and contents are all defined by VESA (Video Electronics Standards Association). Specifically, product information, manufacturer information, displayable video format information, and the like of the display device are stored in a readable state in the display device as EDID (Extended Display Identification Data).

  Patent Document 1 discloses a technique for performing EDID reading and authentication processing without interruption for a display device that cannot display an image due to a failure of authentication processing in the authentication operation of the display device using an HDMI signal. .

  In addition, in the HDMI signal, there is a CEC (Consumer Electronics Control) signal as a control signal between the display device and the output device. The CEC signal is used for one-touch device operation such as reproduction and recording for the output device, power transmission ON / OFF, transmission of a signal corresponding to a remote control key, and the like.

JP 2006-203725 A

  However, as described above, in the related art, the output device only reads information about the displayable resolution of the display device. For this reason, the output mode of the output device is changed by the user selecting the output mode from the setting menu of the output device.

SUMMARY An advantage of some aspects of the invention is that it provides a display device, a system, a display device control method, and a system control method capable of automatically and easily changing the output mode of the output device.

In order to achieve the above object, a display device according to the present invention is connected to an output device that outputs a video signal at any one of a plurality of selectable resolutions, and receives a video signal input from the output device. Displayed on the display unit in any one of a plurality of display modes including a first display mode for displaying one video signal and a second display mode for combining and displaying a plurality of video signals possible display a device, a video signal input from the output device to display on the display unit in the second display mode, the information indicating the output device is a multiple selectable resolutions, the a resulting unit preparative you get from the output device, in accordance with the display size to display the video signal input from the output device to the display unit, the one resolution from among the output device is a multiple selectable resolutions select to And selecting means, the switching information instructing to output the video signal at the selected resolution by the selecting means, the switching information transmission means for transmitting to said output device, the selected input from the output device Display control means for displaying a resolution video signal on the display unit .
The system according to the present invention includes an output device that outputs a video signal at any one of a plurality of selectable resolutions, and a video signal that is connected to the output device and is input from the output device. Can be displayed on the display unit in any one of a plurality of display modes including a first display mode for displaying one video signal and a second display mode for combining and displaying a plurality of video signals. A display device, wherein the display device is the output device.
Acquisition means for acquiring, from the output device, information indicating a plurality of resolutions that can be selected by the output device when the video signal input from the output device is displayed on the display unit in the second display mode; A selection unit that selects one resolution from a plurality of resolutions that can be selected by the output device in accordance with a display size for displaying a video signal input from the device on the display unit, and the selection unit selects the resolution Switching information transmitting means for transmitting switching information for instructing to output a video signal at a resolution to the output device, and a display for displaying the video signal of the selected resolution input from the output device on the display unit Control means, and the output device transmits the information indicating the plurality of selectable resolutions to the display device, and the switching information from the display device. Receiving means for signals to, and having and an output means for outputting a video signal to the display device with the indicated resolution by the switching information.
The display device control method according to the present invention is connected to an output device that outputs a video signal at any one of a plurality of selectable resolutions, and the video signal input from the output device is converted to 1 Display on the display unit in any one of a plurality of display modes including a first display mode for displaying one video signal and a second display mode for combining and displaying a plurality of video signals An apparatus control method, wherein when the video signal input from the output device is displayed on the display unit in the second display mode, information indicating a plurality of resolutions that can be selected by the output device, One resolution is selected from a plurality of resolutions selectable by the output device in accordance with an acquisition step of acquiring from the output device and a display size for displaying the video signal input from the output device on the display unit. A switching information transmitting step for transmitting to the output device switching information for instructing to output a video signal at the resolution selected in the selecting step, and the selected information input from the output device. And a display control step of displaying a resolution video signal on the display unit.
The system control method according to the present invention includes an output device that outputs a video signal at any one of a plurality of selectable resolutions, and an image that is connected to the output device and is input from the output device. The display unit displays the signal in any one of a plurality of display modes including a first display mode for displaying one video signal and a second display mode for combining and displaying a plurality of video signals. A display control method including a display device capable of being displayed on the display device, wherein the output device transmits information indicating a plurality of selectable resolutions to the display device, and the display device includes the output device. An acquisition step for acquiring, from the output device, information indicating a plurality of resolutions that can be selected by the output device when the video signal input from the device is displayed on the display unit in the second display mode. And a step of selecting one resolution from a plurality of resolutions selectable by the output device according to a display size at which the display device displays a video signal input from the output device on the display unit. And a switching information transmitting step for transmitting to the output device switching information for instructing the display device to output a video signal at the resolution selected in the selecting step, and the output device receiving the switching information. A reception step of receiving from the display device; an output step of outputting a video signal to the display device at a resolution instructed by the switching information; and the display device being input from the output device. And a display control step of displaying a video signal of the selected resolution on the display unit.

According to the present invention, it is possible to provide a display device, a system, a display device control method, and a system control method capable of automatically and easily changing the output mode of the output device.

<Example 1>
Below, an example of a display device and an output device concerning an embodiment of the present invention is explained using Drawings 1-7.

  FIG. 1 is a diagram illustrating an example of a configuration of a system using a digital broadcast receiver (digital television; DTV) and a hard disk recorder (personal video recorder; PVR) according to the present embodiment.

  In FIG. 1, a DTV 101 is a display device that decodes and displays an input video signal, and a PVR 102 is an output device that outputs the video signal to the outside.

The video signal is a video signal such as a moving image (movie, television program, etc.) recorded on a recording medium, or a digital broadcast program received by an antenna. That is, the PVR 102 in this embodiment outputs a video signal to the outside by playing back a moving image or the like recorded on a recording medium. Note that the recording medium may or may not be built in the PVR 102. For example, an optical disk such as a DVD or a magnetic disk such as a hard disk may be used as the recording medium. The PVR 102 may be capable of recording a digital broadcast program or the like transmitted from a broadcasting station on a recording medium.

  Further, the DTV 101 can perform display in any one of the plurality of display modes selected by the user, and the PVR 102 can output any one of the plurality of output modes having different qualities. Can output video signals. The display modes are distinguished depending on the display method, and are, for example, a default mode, a two-screen display mode such as PinP (Picture in Picture) display or PoutP (Picture out Picture) display, and a power saving mode. The quality is the resolution of the video, the number of colors, the bit rate, the compression rate, and the like. In this embodiment, the case where the quality is the resolution will be described.

  The antenna 103 is an antenna for receiving video signals such as terrestrial digital broadcast and satellite digital broadcast. Instead of an antenna, it may be configured to receive a video signal (television broadcast data) such as a cable broadcast, or it may be configured to acquire a video signal (broadcast data received via a network) such as an IP broadcast. May be.

  The remote controller 104 is a remote controller for issuing an instruction to the DTV 101. The remote controller 105 is a remote controller for issuing an instruction to the PVR 102.

  The antenna cable 106 is an antenna cable for connecting the antenna 103 and the DTV 101, the antenna 103 and the PVR 102, and the like. The AV cable 107 is an AV cable for connecting the DTV 101 and the PVR 102. That is, the DTV 101 and the PVR 102 can be connected by the AV cable 107. The AV cable 107 includes a control signal line. The transmission format of the control signal may be any format such as analog component, HDMI, DVI, or the like.

  In this embodiment, attention is paid only to the video signal. However, the DTV 101 may decode the audio signal and emit the audio, or the PVR 102 may output the audio signal.

  FIG. 2 is a block diagram illustrating a functional configuration of the DTV 101 according to the first embodiment.

  The connector 201 is a connector for the AV cable 107. By connecting the AV cable connected to the PVR 102 to the connector 201, the DTV 101 and the PVR 102 can be connected. As shown in FIG. 2, the DTV 101 includes a TMDS receiving unit 202, a CEC communication unit 203, and an EDID communication unit 204, and the connector 201 includes a TMDS receiving unit 202, a CEC communication unit 203, and an EDID communication unit. 204 is connected.

  A TMDS (Transition Minimized Differential Signaling) receiving unit 202 is a receiving unit for receiving a video signal and an audio signal. Specifically, a video signal input via the AV cable 107 and the connector 201 is received.

The CEC communication unit 203 is a communication unit that performs communication related to inter-device control with the PVR 102.
Specifically, communication regarding control with the PVR 102 is performed by transmitting and receiving a control signal via the AV cable 107 and the connector 201.

  The EDID communication unit 204 is a communication unit for notifying the PVR 102 of the EDID (manufacturer name, model name, performance, etc.) of the DTV 101. Specifically, the EDID communication unit 204 has an EDID-ROM (memory storing EDID) that can be directly accessed from the PVR 102. The EDID communication unit 204 senses that the power of the PVR 102 is turned on and notifies the PVR 102 that the EDID-ROM is accessible. The notification is made via the AV cable 107 and the connector 201. The PVR 102 also accesses the EDID-ROM through the AV cable 107 and the connector 201.

Further, as shown in FIG. 2, the DTV 101 includes a DTV control unit 205, a control signal bus 206, and an HDCP (High-bandwidth Digital Content).
(Protection system) decoding section 207 is provided. In addition, an antenna connector 208, a tuner unit 209, a decoder unit 210, an image composition unit 211, and a display unit 212 are also provided.

  The DTV control unit 205 is a control unit that controls each function of the DTV 101. The control signal bus 206 is a bus for transmitting a control signal (control signal) from the DTV control unit 205 to each function. That is, the DTV control unit 205 controls each function through the control signal bus 206. For example, the DTV control unit 205 controls the CEC communication unit 203 and the like according to an instruction from the user to the DTV 101. In this embodiment, the DTV control unit 205 controls the CEC communication unit 203 to acquire a list of selectable output modes of the PVR 102 from the PVR 102 in response to an instruction from the user to the DTV 101. Further, the DTV control unit 205 selects the output mode from among the output modes, and transmits the information (switching information) for switching the output mode of the PVR 102 to the selected output mode to the PVR 102. The unit 203 is controlled. That is, the DTV control unit 205 corresponds to an output mode selection unit, and the combination of the DTV control unit 205 and the CEC communication unit 203 corresponds to an output mode list acquisition unit and a switching information transmission unit. Although only one DTV control unit 205 is shown in FIG. 2, a configuration in which a separate control unit is provided for each function (means) may be employed.

  The HDCP decryption unit 207 is a decryption unit for decrypting the encrypted video signal when the video signal or the like received by the TMDS reception unit 202 is encrypted.

  The antenna connector 208 is a connector for the antenna cable 106. By connecting an antenna cable connected to the antenna 103 to the antenna connector 208, the DTV 101 and the antenna 103 can be connected.

  A tuner unit 209 is a tuner that generates transport stream (TS) data from a terrestrial digital broadcast, satellite digital broadcast, CS digital broadcast video signal, and the like received by the antenna 103. Specifically, the tuner unit 209 performs processing such as demodulation and error correction on the received video signal and the like, and generates digital data in the TS format. Note that the tuner unit 209 generates TS data of a predetermined channel (channel designated by the user) from a digital broadcast video signal or the like when receiving a channel selection instruction from the user. In addition, a TMCC (Transmission and Multiplexing Configuration Control) signal superimposed on the TS data together with the TS data is demodulated and output. The TMCC signal is a transmission multiplex control signal for realizing a hierarchical modulation scheme that can specify a demodulation or error correction scheme for each signal unit (slot) on the transmission path.

  The decoder unit 210 is a decoder that decodes TS data output from the tuner unit 209. Specifically, the decoder unit 210 filters the TS data with a packet identifier (PID) and separates it into various data, and decodes the MPEG2 video signal and the MPEG2 audio signal. Note that the decoder unit 210 performs descrambling processing as necessary.

  The image synthesis unit 211 synthesizes the image drawn based on the video signal decoded by the HDCP decoding unit 207, the video signal decoded by the decoder unit 210, and the display signal created by the DTV control unit 205. Part. Specifically, the image synthesis unit 211 synthesizes the above-described image using a frame memory and converts it into a signal format that meets the specifications of the display unit 212. In this embodiment, the image composition unit 211 performs composition for performing PinP display (see FIG. 7).

  The display unit 212 is a display unit that displays the video signal combined by the image combining unit 211 on the display module. The display module is, for example, a module using CRT (Cathode Ray Tube), liquid crystal, plasma, FED (Field Emission Display), EL (Electroluminescence), or the like.

  FIG. 3 is a block diagram illustrating a functional configuration of the PVR 102 according to the present embodiment. Note that FIG. 3 shows only functions related to video signal output and inter-device communication.

  The connector 301 is a connector for the AV cable 107. By connecting the AV cable connected to the DTV 101 to the connector 301, the DTV 101 and the PVR 102 can be connected. As illustrated in FIG. 3, the PVR 102 includes a TMDS transmission unit 302, a CEC communication unit 303, and an EDID communication unit 304. A connector 301 includes a TMDS transmission unit 302, a CEC communication unit 303, and an EDID communication unit. 304 is connected.

  The TMDS transmission unit 302 is a transmission unit for transmitting a video signal and an audio signal. Specifically, a video signal or the like is transmitted to an external device (for example, DTV 101) via the AV cable 107 and the connector 301.

  The CEC communication unit 303 is a communication unit that performs communication related to inter-device control with the DTV 101. Specifically, communication with the DTV 101 is performed by transmitting and receiving a control signal via the AV cable 107 and the connector 301. For example, the CEC communication unit 303 receives the switching information (described above). That is, the CEC communication unit 303 corresponds to a switching information receiving unit.

  The EDID communication unit 304 is a communication unit for acquiring the EDID of an external device (for example, the DTV 101). Specifically, the EDID communication unit 304 accesses the EDID-ROM of the DTV 101 after receiving a notification from the DTV 101 that the EDID-ROM is accessible. As a result, the physical address (port number) of the connector used to connect the PVR 102, the manufacturer name, model name, performance, etc. of the DTV 101 are recognized and acquired. Note that the communication is performed via the AV cable 107 and the connector 301.

  As illustrated in FIG. 3, the PVR 102 includes a PVR control unit 305, a control signal bus 306, a data generation unit 307, and an HDCP encryption unit 308.

The PVR control unit 305 is a control unit that controls each function of the PVR 102. The control signal bus 306 is a bus for transmitting a control signal from the PVR control unit 305 to each function. That is, the PVR control unit 305 controls each function through the control signal bus 306. In this embodiment, the PVR control unit 305 controls the CEC communication unit 303 so as to transmit a list of selectable output modes of the PVR 102, or switches the output mode according to the switching information. 307 is controlled. That is, a combination of the PVR control unit 305 and the CEC communication unit 303 corresponds to an output mode list transmission unit, and a combination of the PVR control unit 305 and the data generation unit 307 corresponds to a switching unit. Although only one PVR control unit 305 is illustrated in FIG. 3, a configuration in which a separate control unit is provided for each function (means) may be employed.

  The data generation unit 307 is a generation unit for generating a video signal and an audio signal. Specifically, a video signal and an audio signal are generated by reproducing video data and audio data stored in a recording medium (not shown) (hard disk, DVD, etc.).

  The HDCP encryption unit 308 is an encryption unit for encrypting the video signal generated by the data generation unit 307 (video signal transmitted from the TMDS transmission unit 302) and the like. The HDCP encryption unit 308 performs an authentication process with the HDCP decryption unit 207 of the DTV 101, and delivers the video signal and the like to the TMDS transmission unit 302 so as to transmit the video signal and the like only when the authentication is performed.

  Hereinafter, the flow of processing between the DTV 101 and the PVR 102 in this embodiment will be described. Note that the DTV 101 and the PVR 102 are connected to each other by an AV cable 107.

  First, of the processing (communication processing) between the DTV 101 and the PVR 102, the processing flow until the video signal generated by the PVR 102 is displayed on the display unit 212 of the DTV 101 will be described with reference to FIG. FIG. 4 is a flowchart illustrating a flow of processing between the DTV 101 and the PVR 102 according to the first embodiment.

  First, the EDID communication unit 204 of the DTV 101 detects that power is supplied to the EDID communication unit 304 of the PVR 102 (5 V power) (step S401).

  Next, the EDID communication unit 204 transmits an HPD (Hot Plug Detect) signal to the EDID communication unit 304 (step S402).

  Then, the EDID communication unit 304 detects (receives) the HPD signal (step S403).

  Next, the EDID communication unit 304 accesses the EDID-ROM of the EDID communication unit 204 and reads data (EDID) such as manufacturer name, model name, and performance (step S404).

  Then, the EDID communication unit 304 recognizes a physical address corresponding to the connector 201 of the DTV 101 (step S405). The physical address is a value uniquely assigned to each connector.

  Next, the EDID communication unit 304 recognizes the resolution (corresponding resolution) that can be displayed on the DTV 101 from the data such as the manufacturer name, model name, and performance obtained in step S404 (step S406). For example, the range of resolution and the maximum value that can be received by the TMDS receiver 202 are recognized.

Then, the PVR control unit 305 selects an output mode based on the resolution recognized in step S406, and the data generation unit 307 generates a video signal in the selected output mode. Then, the HDCP encryption unit 308 encrypts the video signal, and the TMDS transmission unit 302 outputs the encrypted video signal from the connector 301 to the DTV 101 (step S407). Note that encryption may or may not be performed. The output video signal is input to the connector 201 of the DTV 101.

  The selected output mode is the output mode of the resolution recognized in step S406 or the output mode of the resolution set by the user among the selectable output modes of the PVR 102. Note that the resolution setting by the user is performed on the PVR 102 using the remote controller 105 or the like.

  Next, the TMDS receiving unit 202 receives the video signal input to the connector 201, and delivers the video signal to the HDCP decoding unit 207 (step S408).

  Then, the HDCP decryption unit 207 decrypts the encrypted video signal and delivers the decrypted video signal to the display unit 212 via the image composition unit 211. If the received video signal is not encrypted, the video signal is transferred to the display unit 212 as it is (via the image synthesis unit 211).

  Through the above steps, the video signal generated by the PVR 102 is displayed on the display unit 212 (step S409). The video signal displayed on the display unit 212 is not limited to the video signal generated by the PVR 102. For example, the image combining unit 211 may display the video signals simultaneously by combining the video signals input from the antenna connector 208 with the video signals, menu data, banner data, and the like.

Next, CEC communication between the DTV 101 and the PVR 102 will be described. Each connected device acquires the logical address shown in the table of FIG. In order to acquire this logical address, it is necessary to recognize the physical address in step S405. When the DTV 101 and the PVR 102 are connected, the DTV 101 requests the TV with the address 0, and the PVR 102 records the address 1 with the recording.
Device1 is requested.

  Next, FIG. 6 shows a processing flow for the DTV 101 to change the output mode for the PVR 102, which is a feature of the present invention. In this case, it is assumed that the PVR 102 is connected to the connector 201 of the DTV 101 and the authentication process has already been completed.

  As a target use case, the user may display both the video signal input from the antenna connector 208 and the video signal generated by the PVR 102 on the DTV 101 (for example, a two-screen display mode such as PinP). For example, when instructed. Specifically, as shown in FIG. 7, the video signal output from the PVR 102 is displayed on the sub-screen in PinP display. When performing the PinP display, the display size given to the sub-screen is smaller than the one-screen display. That is, the resolution of the sub screen is lower than that of the single screen display. Therefore, even if a high-resolution video is input from the PVR 102, the video is reduced to the resolution of the sub-screen when displayed. Therefore, even if the output mode of the PVR 102 is changed to a lower resolution, the display quality is not affected. If the output mode of the PVR 102 is changed to a lower resolution, the amount of received data processing and resolution conversion in the DTV 101 can be reduced, and the heat generation and cost of the set can be reduced. Hereinafter, the flow of processing will be described.

First, the DTV control unit determines whether or not the display mode is the two-screen display mode (PinP) (step S601). When the display mode is the two-screen display mode (step S601; YES), the process proceeds to step S602, and when the display mode is not the two-screen display mode (step S).
601; NO) The determination is repeated until the two-screen display mode is entered. In the example of FIG. 6, the determination is always performed, but the process may proceed to step S <b> 602 when the DTV 101 receives an instruction to perform PinP display. The instruction to change to the two-screen display mode is given by the user using the remote controller 104, for example.

  In step S <b> 602, the CEC communication unit 203 of the DTV 101 receives an instruction from the DTV control unit 205 and requests a list of selectable output modes from the CEC communication unit 303 of the PVR 102. Note that this processing is preferably performed only when the video signal generated by the PVR 102 is displayed on the PinP display sub-screen 702.

  When the CEC communication unit 303 receives the output mode list request, the PVR control unit 305 instructs the CEC communication unit 303 to transmit the list. Then, the CEC communication unit 303 transmits a list of selectable output modes to the CEC communication unit 203 (step S603).

  Next, the CEC communication unit 203 receives the output mode list transmitted in step S <b> 603 and passes the list to the DTV control unit 205. Then, the DTV control unit 205 selects an optimal resolution (output mode) to be input to the image composition unit 211 and instructs the CEC communication unit 203 to transmit switching information. Then, the CEC communication unit 203 transmits the switching information to the CEC communication unit 303 (step S604).

  The optimum resolution for the input is a resolution corresponding to the resolution of the sub-screen of PinP display among the resolutions selectable by the PVR 102. Note that the optimum resolution and the sub-screen resolution do not need to match (of course, preferably match). The optimum resolution may be higher than the resolution of the sub screen, or may be lower. For example, when none of the selectable resolutions matches the resolution of the sub screen (for example, when the resolution of the sub screen is out of the standard), the resolution of the sub screen is the most among the selectable resolutions. A close resolution may be set as the optimum resolution. Of the resolutions higher than the resolution of the sub screen, the lowest resolution may be set as the optimum resolution. Thereby, it is possible to prevent the down-conversion of the video displayed on the sub screen.

  When the CEC communication unit 303 receives the switching information transmitted in step S604, the PVR control unit 305 instructs the data generation unit 307 to change the resolution (step S605).

  Next, the data generation unit 307 generates a video signal in the output mode with the resolution designated in step S605, and the video signal is encrypted by the HDCP encryption unit 308. Then, the TMDS transmission unit 302 outputs the video signal from the connector 301 to the DTV 101 (step S606).

  Then, the video signal output in step S606 is input to the connector 201 and received by the TMDS receiver 202 (step S607).

  Next, when the video signal received in step S607 is encrypted, the HDCP decryption unit 207 decrypts the signal, and the process proceeds to step S608. If the received video signal is not encrypted, the process proceeds to step S608.

In step S608, the image composition unit 211 composes the video signal as a sub screen 702 with the main screen 701 that is a video signal of broadcast data (a video signal input from the antenna connector 208). Thereby, PinP display is performed on the display unit 212. Note that the image composition unit 211 also performs processing (resolution conversion) for matching the input video signal to the resolution of the display screen.

  As described above, when performing the PinP display on the DTV 101, the received data processing of the TMDS receiving unit 202 and the HDCP decoding unit 207 of the DTV 101 can be reduced by changing the output resolution of the PVR 102. In addition, it is possible to reduce the amount of resolution conversion and composition processing in the image composition unit 211.

  Note that the video signal transmitted from the connector may be converted as a transmission signal by the TMDS transmission unit. In that case, when the TMDS receiver receives the transmission signal, it is converted into a video signal.

<Example 2>
Hereinafter, other examples of the display device and the output device according to the embodiment of the present invention will be described with reference to FIGS.

  The configuration of a system using a digital broadcast receiver (DTV) and a hard disk recorder (PVR) according to this embodiment will be described with reference to FIG. FIG. 8 is a diagram showing an example of a system configuration using a digital broadcast receiver (DTV) and a hard disk recorder (PVR) according to the present embodiment. The description of the same parts as those in FIG. 1 is omitted.

  PVR 801 is a PVR equivalent to PVR 102. That is, the block configuration of the functions relating to the image signal output and inter-device communication of the PVR 801 is as shown in FIG. The PVR 801 is connected to the antenna 103 using the antenna cable 106 and is connected to the DTV 101 using the AV cable 803. Note that the AV cable 107 and the AV cable 803 may be the same (terminal type and the like) or may be different.

  In this embodiment, the functions of PVR 801 and PVR 102 are distinguished from each other by giving different numbers. That is, the PVR 801 includes a connector 1301, a TMDS transmission unit 1302, a CEC communication unit 1303, an EDID communication unit 1304, a PVR control unit 1305, a control signal bus 1306, a data generation unit 1307, and an HDCP encryption unit 1308.

  A remote controller 802 is a remote controller for issuing an instruction to the PVR 801.

  A functional configuration of the DTV 101 according to the present embodiment will be described with reference to FIG. FIG. 9 is a block diagram illustrating a functional configuration of the DTV 101 according to the present embodiment. The description of the same parts as those in FIG. 1 is omitted.

  A connector 901 is a connector for the AV cable 803. By connecting the AV cable connected to the PVR 801 to the connector 901, the DTV 101 and the PVR 801 can be connected. As shown in FIG. 9, the DTV 101 further includes a TMDS receiving unit 902 and an EDID communication unit 903 in addition to the configuration of FIG. 1, and the connector 901 includes a TMDS receiving unit 902, a CEC communication unit 203, and EDID communication. Part 903.

  The TMDS receiver 902 is a receiver for receiving video signals and audio signals. Specifically, a video signal input through the AV cable 803 and the connector 901 is received.

  The EDID communication unit 903 is a communication unit for notifying the PVR 801 of the EDID of the DTV 101. Specifically, the EDID communication unit 903 has an EDID-ROM that can be directly accessed from the PVR 801. The EDID communication unit 903 detects that the power of the PVR 801 is turned on, and notifies the PVR 801 that the EDID-ROM can be accessed. This notification is made via the AV cable 803 and the connector 901.

  As shown in FIG. 9, the DTV 101 further includes an HDCP decoding unit 904.

  The HDCP decryption unit 904 is a decryption unit for decrypting the encrypted video signal when the video signal or the like received by the TMDS reception unit 902 is encrypted.

  Note that the CEC communication unit 203 in this embodiment performs not only communication related to inter-device control with the PVR 102 but also communication related to inter-device control with the PVR 801. Communication regarding inter-device control with the PVR 801 is performed by transmitting and receiving a control signal via the connector 901 and the AV cable 803.

  In addition to the processing in the first embodiment, the DTV control unit 205 in the present embodiment also obtains a list of selectable output modes of the PVR 801 from the PVR 801 in response to an instruction from the user to the DTV 101. A process of controlling 203 is also performed. Further, the DTV control unit 205 selects an output mode from the list or transmits information (switching information) for switching the output mode of the PVR 801 to the selected output mode to the PVR 801. 203 is controlled.

  In addition to the images that can be combined by the image combining unit according to the first embodiment, the image combining unit 211 according to the present embodiment can also combine an image drawn based on the video signal decoded by the HDCP decoding unit 904. Specifically, the image composition unit 211 synthesizes the above-described image using a frame memory and converts the image into a signal format that meets the specifications of the display unit 212. In this embodiment, the image composition unit 211 performs composition for performing PoutP display (see FIG. 10).

  The flow of processing between the DTV 101, the PVR 102, and the PVR 801 in this embodiment will be described below. It is assumed that DTV 101 and PVR 102 and DTV 101 and PVR 801 are connected to each other by AV cable 107 and AV cable 803, respectively.

  Of the processes between the DTV 101 and the PVR 801, the process flow until the video signal generated by the PVR 801 is displayed on the display unit 212 of the DTV 101 is equivalent to the process flow between the DTV 101 and the PVR 102 shown in FIG. Therefore, the description is omitted. However, PVR102 and PVR801 shall operate | move independently, respectively.

  Further, the process until the CEC communication between the DTV 101 and the PVR 801 is performed is the same as the process between the DTV 101 and the PVR 102. That is, the newly connected device (PVR 801) in this embodiment also acquires a logical address corresponding to the contents of the table shown in FIG. The acquisition of this logical address requires recognition of the physical address in step S405 shown in FIG. When the DTV 101 is connected to the PVR 102 and the PVR 801, the DTV 101 requests the TV with the address 0. Then, the PVR 102 and the PVR 801 request a recording device 1 with an address 1 and a recording device 2 with an address 2, respectively. Address 1 and address 2 depend on which one is requested first.

Next, FIG. 11 shows a process flow for the DTV 101 to change the output mode for the PVR 102 and the PVR 801, which is a feature of the present invention. In that case, PVR102 is DTV1.
It is assumed that the PVR 801 is connected to the connector 201 of 01 and the connector 901 of the DTV 101, and the authentication process has already been completed.

  As a target use case, the user instructs the DTV 101 to display the video signal generated by the PVR 102 and the video signal generated by the PVR 801 (for example, two-screen display such as PoutP). This is the case. Specifically, as shown in FIG. 10, the video signal output from the PVR 102 or PVR 801 is displayed on the main screen 1001 or the sub screen 1002 in the PoutP display. When the PoutP display is performed, the display size given to each screen is smaller than the single screen display. That is, the resolution of each screen is lower than in the case of single screen display. Therefore, even if the output mode of the PVR 102 or PVR 801 is changed to a lower resolution, the display quality is not affected. If the output mode of the PVR 102 or PVR 801 is changed to a lower resolution, the amount of received data processing and resolution conversion in the DTV 101 can be reduced, and the heat generation and cost of the set can be reduced. Moreover, even if the input image processing capability of the DTV 101 cannot receive a plurality of high-quality input image data at the same time, it is possible to suitably perform two-screen display by sharing resources. Hereinafter, the flow of processing will be described.

  First, the DTV control unit determines whether or not the display mode is the two-screen display mode (PoutP) (step S1101). When the display mode is the two-screen display mode (step S1101; YES), the process proceeds to step S1102, and when the display mode is not the two-screen display mode (step S1101; NO), the determination is repeated until the two-screen display mode is entered. In the example of FIG. 11, the determination is always performed, but the process may proceed to step S1102 when the DTV 101 receives an instruction to perform PoutP display. The instruction to change to the two-screen display mode is given by the user using the remote controller 104, for example.

  In step S1102, the CEC communication unit 203 of the DTV 101 requests the CEC communication unit 303 of the PVR 102 for a list of selectable output modes. In this embodiment, it is assumed that the video signal generated by the PVR 102 is displayed on the main screen 1001 for PoutP display.

  When the CEC communication unit 303 of the PVR 102 receives the output mode list request, the PVR control unit 305 instructs the CEC communication unit 303 to transmit the list. Then, the CEC communication unit 303 transmits a list of selectable output modes to the CEC communication unit 203 (step S1103).

  Next, the CEC communication unit 203 of the DTV 101 requests a list of selectable output modes from the CEC communication unit 1303 of the PVR 801 (step S1104). In this embodiment, it is assumed that the video signal generated by the PVR 801 is displayed on the sub-screen 1002 for PoutP display.

  When the CEC communication unit 1303 of the PVR 801 receives the output mode list request, the PVR control unit 1305 instructs the CEC communication unit 1303 to transmit the list. Then, the CEC communication unit 1303 transmits a list of selectable output modes to the CEC communication unit 203 (step S1105).

Next, the CEC communication unit 203 receives the output mode list transmitted in steps S1103 and S1105, and passes the list to the DTV control unit 205. Then, the DTV control unit 205 selects an optimal resolution (output mode) to be input to the image composition unit 211 for each of the main screen 1001 and the sub screen 1002 (step S1106).

  Then, the DTV control unit 205 instructs the CEC communication unit 203 to transmit switching information, and the CEC communication unit 203 transmits the switching information to the CEC communication unit 303 (step S1107). That is, the DTV 101 requests the PVR 102 to change the resolution on the main screen side.

  Next, when the CEC communication unit 303 receives the switching information transmitted in step S1107, the PVR control unit 305 instructs the data generation unit 307 to change the output mode (step S1108).

  Then, the CEC communication unit 303 transmits the completion of the change of the output mode to the CEC communication unit 203 (step S1109), and proceeds to step S1110 and step S1113.

  In step S1113, the data generation unit 307 generates a video signal in the output mode with the resolution specified in step S1109, and the video signal is encrypted by the HDCP encryption unit 308. Then, the TMDS transmission unit 302 outputs the video signal from the connector 301 to the DTV 101, and the process proceeds to step S1115. The process of step S1115 will be described later.

  In step S1110, the DTV control unit 205 instructs the CEC communication unit 203 to transmit switching information, and the CEC communication unit 203 transmits the switching information to the CEC communication unit 1303. That is, the DTV 101 requests the PVR 801 to change the resolution on the sub screen side.

  Next (after step S1110), when the CEC communication unit 1303 receives the switching information transmitted in step S1110, the PVR control unit 1305 instructs the data generation unit 1307 to change the output mode (step S1110). S1111).

  Then, the CEC communication unit 1303 transmits the completion of the change of the output mode to the CEC communication unit 203 (step S1112), and proceeds to step S1114.

  In step S1114, the data generation unit 1307 generates a video signal in the output mode with the resolution specified in step S1112, and the video signal is encrypted by the HDCP encryption unit 1308. Then, the TMDS transmission unit 1302 outputs the video signal from the connector 1301 to the DTV 101, and the process proceeds to step S1115.

  In step S1115, the video signal output in step S1113 is input to the connector 201 and received by the TMDS receiver 202. In addition, the video signal output in step S1114 is input to the connector 901 and received by the TMDS receiver 902. When the video signal received by the TMDS receiving unit 202 is encrypted, the signal is decrypted by the HDCP decrypting unit 207, and the video signal received by the TMDS receiving unit 902 is encrypted. In this case, the signal is decoded by the HDCP decoding unit 904.

  Next, the image combining unit 211 combines the video signals output from the PVR 102 as the main screen 1001 and the video signals output from the PVR 801 as the sub screen 1002 (step S1116). Thereby, PoutP display is performed on the display unit 212.

  As described above, in this embodiment, when PoutP display is performed by the DTV 101, the output resolutions (output modes) of the PVR 102 and the PVR 801 are changed. Thereby, the reception data processing of the TMDS receiving unit 202, the TMDS receiving unit 902, the HDCP decoding unit 207, and the HDCP decoding unit 904 in the DTV 101 can be reduced. In addition, it is possible to reduce the amount of resolution conversion and composition processing in the image composition unit 211. Since data processing can be reduced, high performance is not required as a function of the TMDS receiving unit 202, the TMDS receiving unit 902, the HDCP decoding unit 207, and the HDCP decoding unit 904 (for example, the processing speed and the maximum amount of data that can be processed). . That is, two-screen display can be performed without a plurality of high-resolution reception capabilities.

<Example 3>
Since the configuration of this embodiment is the same as that of Embodiment 1 and Embodiment 2, description thereof is omitted.

  In general, the EDID communication unit 204 records the reception performance (such as the maximum receivable resolution) of the TMDS receiving unit 202 in an EDID-ROM. Therefore, if the TMDS receiving unit 202 has an input performance that is higher than the display performance (maximum displayable resolution) of the display unit 212 of the DTV 101, the PVR is configured to transmit a signal with a resolution and the number of colors that exceed the display performance. The control unit 305 determines. Specifically, the communication between the EDID communication unit 304 and the EDID communication unit 204 of the PVR 102 causes the PVR control unit 305 to determine that a signal having a resolution and color number that is higher than the display performance of the display unit 212 is transmitted. . Communication between the EDID communication unit 304 and the EDID communication unit 204 is performed by connecting the connector 201 of the DTV 101 and the connector 301 of the PVR 102 with the AV cable 107 as described above.

  In such a situation, extra processing (such as conversion of resolution for display on the display unit) is required, and power consumption increases. Therefore, when the user selects the power saving mode as the setting of the DTV 101, a configuration may be adopted in which a change in the resolution of the PVR 102 is requested via the CEC communication unit 203 of the DTV 101.

  Even in the case of the second embodiment, when the power saving mode is selected as the setting of the DTV 101, it may be configured to request the resolution change of the PVR 102 and the PVR 801 via the CEC communication unit 203 of the DTV 101. .

FIG. 1 is a diagram illustrating an example of a configuration of a system using a DTV and a PVR according to the first embodiment. FIG. 2 is a block diagram illustrating a functional configuration of the DTV according to the first embodiment. FIG. 3 is a block diagram illustrating a functional configuration of the PVR according to the first embodiment. FIG. 4 is a flowchart illustrating a process flow between the DTV and the PVR according to the first embodiment. FIG. 5 is an example of a table of logical addresses used for CEC communication. FIG. 6 shows the first embodiment. It is a flowchart which shows the flow of a process for DTV to change an output mode with respect to PVR. FIG. 7 is a diagram illustrating an example of the PinP display. FIG. 8 is a diagram illustrating an example of a configuration of a system using the DTV and the PVR according to the second embodiment. FIG. 9 is a block diagram illustrating a functional configuration of the DTV according to the second embodiment. FIG. 10 is a diagram illustrating an example of PoutP display. FIG. 11 shows the second embodiment. It is a flowchart which shows the flow of a process for DTV to change an output mode with respect to PVR.

Explanation of symbols

101 DTV
102 PVR
DESCRIPTION OF SYMBOLS 103 Antenna 104 Remote controller 105 Remote controller 106 Antenna cable 107 AV cable 201 Connector 202 TMDS receiving part 203 CEC communication part 204 EDID communication part 205 DTV control part 206 Control signal bus 207 HDCP decoding part 208 Antenna connector 209 Tuner part 210 Decoder part 211 Image composition unit 212 Display unit 301 Connector 302 TMDS transmission unit 303 CEC communication unit 304 EDID communication unit 305 PVR control unit 306 Control signal bus 307 Data generation unit 308 HDCP encryption unit 701 Main screen 702 Sub screen 801 PVR
802 Remote controller 803 AV cable 901 Connector 902 TMDS receiving unit 903 EDID communication unit 904 HDCP decoding unit 1001 Main screen 1002 Sub screen

Claims (6)

A first display mode that is connected to an output device that outputs a video signal at any one of a plurality of selectable resolutions and that displays the video signal input from the output device ; A display device capable of displaying on a display unit in any one of a plurality of display modes including a second display mode for combining and displaying a plurality of video signals ,
When displaying a video signal input from the output device to the display unit in the second display mode, the information indicating the output device is a multiple selectable resolutions, preparative you get from the output device to give Means,
And a video signal according to the display size to be displayed on the display unit, the output device is one you select a resolution selection means from among a plurality of selectable resolutions inputted from the output device,
Switching information transmitting means for transmitting to the output device switching information for instructing to output a video signal at the resolution selected by the selecting means ;
Display control means for displaying a video signal of the selected resolution input from the output device on the display unit;
A display device comprising: The selection unit is closest to a resolution corresponding to a display size for displaying a video signal input from the output device on the display unit among a plurality of resolutions selectable by the output device, and corresponds to the display size. The display device according to claim 1, wherein a resolution higher than a resolution to be selected is selected . The video signal output from the output device is input to the display device via an HDMI format or DVI format cable.
The display device according to claim 1, wherein the display device is a display device. An output device that outputs a video signal at one of a plurality of selectable resolutions, and a first video signal that is connected to the output device and that is input from the output device and displays one video signal. And a display device that can display on the display unit in any one of a plurality of display modes including a second display mode that combines and displays a plurality of video signals. And
The display device
An acquisition unit configured to acquire, from the output device, information indicating a plurality of resolutions that can be selected by the output device when the video signal input from the output device is displayed on the display unit in the second display mode; ,
Selection means for selecting one resolution from a plurality of resolutions selectable by the output device according to a display size for displaying a video signal input from the output device on the display unit;
Switching information transmitting means for transmitting to the output device switching information for instructing to output a video signal at the resolution selected by the selecting means;
Display control means for displaying a video signal of the selected resolution input from the output device on the display unit;
Have
The output device is
Transmitting means for transmitting information indicating a plurality of selectable resolutions to the display device;
Receiving means for receiving the switching information from the display device;
Output means for outputting a video signal to the display device at a resolution instructed by the switching information;
Have
A system characterized by that. A first display mode that is connected to an output device that outputs a video signal at any one of a plurality of selectable resolutions and that displays the video signal input from the output device; A display device control method for displaying on a display unit in any one of a plurality of display modes including a second display mode for combining and displaying a plurality of video signals,
An acquisition step of acquiring, from the output device, information indicating a plurality of resolutions that can be selected by the output device when the video signal input from the output device is displayed on the display unit in the second display mode; ,
A selection step of selecting one resolution from a plurality of resolutions that can be selected by the output device according to a display size for displaying the video signal input from the output device on the display unit;
  Switching information transmission step for transmitting to the output device switching information for instructing to output a video signal at the resolution selected in the selection step;
A display control step of displaying the video signal of the selected resolution input from the output device on the display unit;
A control method for a display device, comprising: An output device that outputs a video signal at one of a plurality of selectable resolutions, and a first video signal that is connected to the output device and that is input from the output device and displays one video signal. Control of a system including a display device capable of displaying on a display unit in any one of a plurality of display modes, including a display mode including a plurality of display modes and a second display mode for combining and displaying a plurality of video signals A method,
A transmission step in which the output device transmits information indicating the selectable resolutions to the display device;
When the display device displays a video signal input from the output device on the display unit in the second display mode, information indicating a plurality of resolutions selectable by the output device is transmitted from the output device. An acquisition step to acquire;
A selection step in which the display device selects one resolution from a plurality of resolutions selectable by the output device in accordance with a display size for displaying a video signal input from the output device on the display unit;
A switching information transmission step for transmitting, to the output device, switching information instructing the display device to output a video signal at the resolution selected in the selection step;
The output device receives the switching information from the display device; and
The output device outputs a video signal to the display device at a resolution indicated by the switching information.
An output step for outputting
A display control step in which the display device displays the video signal of the selected resolution input from the output device on the display unit;
A method for controlling a system, comprising: