JP2010014979A - Display device, video output device and video display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which allows even a user having poor knowledge relating to the video format to set the best video format to an external video output device. <P>SOLUTION: The display device 1 capable of mutual communication between the video output device 3 and the display device includes: a storage part 34 for storing a plurality of format information which exhibit formats of the video signals capable of displaying; an HMDI communication part 33 of obtaining the plurality of format information which exhibit formats of video signals to be output using the video output device 3 side from the video output device 3; a specifying means for specifying the format information of the maximum resolution by comparing respective devices with one another; an acceptance means for accepting "necessary" or "unnecessary" of setting change of the format; and a means of setting an video format of the maximum resolution on the video output device when accepting the setting change. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device, a video output device, and a video display system, and in particular, is configured to set a format that can be supported by each device in the video output device by transmitting and receiving format information of a video signal between the devices. The present invention relates to a display device, a video output device, and a video display system.

  A display device having a high-definition multimedia interface (HDMI) terminal has been put into practical use. The HDMI terminal is an interface conforming to the HDMI standard, and in the HDMI standard, a video signal, an audio signal, and various control signals can be transmitted with a single cable. A video output device such as a DVD recorder or a set top box is connected to the HDMI terminal of the display device. The display device receives the video signal and the audio signal output from the video output device, and displays the video and reproduces the audio.

On the other hand, with the progress of digitalization, display devices and video output devices that support a plurality of video formats and audio formats have been put into practical use. Examples of the video format include 480i (interlace), 480p (progressive), 1080i, 720p, and 1080p, and examples of the audio format include AAC, PCM, and AC3.
However, since compatible video and audio formats differ from device to device, when connecting a video output device to a display device, the video format and audio format that can be supported by each device are compared. A setting operation for manually setting the audio format in the video output apparatus is required. In general, the setting method of the video and audio format on the video output device side is different for each model and manufacturer, so that it is necessary to operate a complicated operation menu for each video output device connected to the display device.
In addition, if various settings such as resolution and aspect ratio on the video output device side are inappropriate, the screen may not be displayed properly, and some users may recognize this as a problem on the display device side. Investigation and countermeasures may be difficult. In order to solve these problems, various methods for facilitating setting operations of various formats have been proposed.

For example, the display device according to Patent Document 1 acquires Extended Display Identification Data (EDID) information from a video output device using an HDMI CEC (Consumer Electronics Control) command, and acquires the acquired EDID information and the EDID of the display device. It is configured to compare with information and display a list of resolutions of video signals that can be displayed from the display device. When a desired resolution is selected by the user, the display device transmits the selected resolution to the video output device using the CEC command, and changes the setting contents of the video output device.
In the display device configured in this way, even when video output devices of different models are connected, settings relating to the resolution of each video output device can be handled uniformly on the display device side.

In addition, a display device configured to store the resolution selected on the display device side so that an external video output device recognizes that only one resolution can be displayed on the display device is proposed ( For example, Patent Document 2).
In the display device configured as described above, even if a video output device capable of displaying a list of resolutions that can be output on the display device side and prompting the setting is connected to the display device, the video output device is still on the display device side. Since it is recognized that there is only one resolution that can be displayed, the video signal of the resolution is output without prompting the user to set the resolution. Therefore, setting the resolution only once on the display device side makes it unnecessary to set the resolution on the video output device side thereafter.

  Furthermore, information indicating display conditions such as optimal resolution and aspect ratio that can be handled by the display device, for example, EDID information is acquired from the display device in advance, and a video signal to be output to the display device based on the acquired information. A video output device capable of setting the resolution, aspect ratio, and the like has been proposed (for example, Patent Document 3).

Furthermore, a video output device that outputs an aspect ratio test pattern and facilitates setting of the aspect ratio has been proposed (for example, Patent Document 4). In the video output device according to Patent Document 4, it is possible to easily set the aspect ratio of the output video.
JP 2008-67024 A JP 2007-158903 A JP 2005-109703 A JP 2007-124275 A

  However, in the display devices according to Patent Documents 1 and 2, it is necessary to select one video format from a menu screen from a plurality of video formats displayed in a list, and for users who have little knowledge about the resolution of video signals. In some cases, it cannot be determined which video signal is optimal. For example, when a video format such as “1080i” or “1080p” is displayed, there is a problem in that it is impossible for a user who has little knowledge about interlace and progressive to determine which is the optimal resolution.

  The video output device according to Patent Document 3 is configured to acquire and set the display conditions such as the optimum resolution and aspect ratio stored in the display device from the display device, but the combination of the devices is not necessarily required. There is a problem that the optimum resolution considering the above cannot be set. This is due to the following reason. The EDID has a part that describes the recommended resolution, but the recommended resolution of the display device is set solely by the manufacturer of the display device, and does not necessarily describe the highest resolution that the display device can display Because of that. For example, even in a display device that supports 1080i video signals, the resolution 720p may be stored as the recommended resolution if the display device is widely used at the time of shipment.

  In Patent Document 4, it is necessary for the user to make the setting while confirming the test pattern, and there is a problem that the aspect ratio setting itself is difficult for the user who has little knowledge of the aspect ratio. .

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is one video that is optimal for each device on the display device or video output device side without displaying a list of video formats corresponding to the video output device and the display device. By determining the format and accepting only the necessity of setting change, even if the user has little knowledge about the video format, the optimum video format can be output simply by selecting the necessity of setting change. An object is to provide a display device, a video output device, and a video display system that can be set in the device.

  The display device according to the present invention sets a specific format in the video output device by transmitting and receiving the format information of the video signal to and from the video output device that outputs the video signal in a plurality of formats. In the display device that receives the video signal output from the output device and displays the video, storage means for storing a plurality of format information indicating the format of the video signal that can be displayed, and output on the video output device side are possible An acquisition unit that acquires a plurality of format information indicating a format of a video signal from the video output device, a plurality of format information acquired by the acquisition unit and a plurality of format information stored in the storage unit are compared, Identification means for identifying one format information that can be output and displayed, and whether or not the format setting needs to be changed And the setting information for setting the format of the video signal output from the video output device based on the one format information specified by the specifying means when the receiving means receives the setting change. And setting information transmitting means for transmitting to the output device.

  In the display device according to the present invention, the format information includes information indicating resolution, and the specifying unit specifies format information of a maximum resolution that can be output and displayed.

  The display device according to the present invention includes setting format information acquisition means for acquiring setting format information indicating a format set on the video output device side, setting format information acquired by the setting format information acquisition means, and the specifying means And a means for comparing the specified format information, wherein the accepting means accepts the necessity of setting change when the resolution of the set format information is lower than the resolution of the format information specified by the specifying means. It is characterized by being.

  The display device according to the present invention includes a detection unit that detects a black belt part included in a part of a video based on a video signal, and when the detection unit detects the black belt part, A means for comparing a predetermined value and an aspect ratio setting that accepts whether or not an aspect ratio setting change related to the video signal output from the video output device is determined when the area of the black belt portion is equal to or larger than the predetermined value And a means for transmitting setting information for changing the aspect ratio of the video signal output from the video output device to the video output device when the change accepting unit and the aspect ratio setting change receiving unit accept the setting change of the aspect ratio. It is characterized by providing.

  In the display device according to the present invention, the storage unit stores a plurality of format information indicating formats of audio signals that can be reproduced, and the acquisition unit stores audio signals that can be output on the video output device side. Means for acquiring a plurality of format information indicating the format from the video output device, and further comparing the plurality of format information acquired by the acquisition means with the plurality of format information stored in the storage means for output; And an audio format specifying means for specifying one format information of a reproducible audio signal and a format of the audio signal output from the video output device based on the one format information specified by the audio format specifying means Means for transmitting the setting information to be sent to the video output device.

  A video display system according to the present invention includes any one of the display devices described above and a video output device that outputs a video signal. The display device and the video output device include a video signal, format information, and a setting through an HDMI cable. Information is transmitted and received.

  A video output device according to the present invention sets a specific format by transmitting and receiving format information of a video signal to and from a display device that displays video based on the video signal, and displays the video signal in the format. In the video output device for outputting to the storage device, storage means for storing a plurality of format information indicating the format of the video signal that can be output, and a plurality of format information indicating the format of the video signal that can be displayed on the display device side are displayed. A specification for identifying one format information that can be output and displayed by comparing the acquisition means acquired from the apparatus with the plurality of format information acquired by the acquisition means and the plurality of format information stored in the storage means Means, accepting means for accepting the necessity of format setting change, and accepting the setting change by the accepting means If the format of the output video signal, characterized in that it comprises a means for setting in accordance with one of the format information the specifying means has specified.

  A video display system according to the present invention includes a display device that displays video based on a video signal and the video output device described above, and the display device and the video output device transmit and receive video signals and format information through an HDMI cable. It is made to do so.

In the present invention, the display device supports a plurality of formats, and can display video based on video signals of each format. The storage means stores format information indicating each format that can be displayed.
On the other hand, the video output device supports a plurality of formats, and can output a video signal in each format. The acquisition device of the display device acquires format information indicating each format that can be output on the video output device side from the video output device. The display device and the video output device are connected via, for example, an HDMI cable, and the display device acquires format information through the HDMI cable.
Then, the specifying unit specifies one format corresponding to each of the display device and the video output device. One format is determined based on a predetermined viewpoint. For example, the format having the maximum resolution is specified.
Next, the accepting unit accepts whether or not the format setting needs to be changed without displaying a list of formats corresponding to the display device and the video output device. Therefore, the user does not need to select one format from the format list, and knowledge about the format becomes unnecessary.
When the accepting unit accepts the setting change, it sends setting information for setting the format of the video signal to be output from the video output device based on the one format information specified by the specifying unit to the video output device. The format is set in the video output device.
Note that the video format is not limited only to the resolution, but has a broad meaning that also means an aspect ratio, an encoding method, and other various standards.

  In the present invention, a format corresponding to the display device and the video output device and having the maximum resolution is specified and set in the video output device.

In the present invention, the display device checks whether or not the format set in the video output device is optimal. Specifically, the setting format information acquisition unit of the display device acquires setting format information indicating the format currently set in the video output device. Then, the display device determines whether or not the resolution of the format currently set in the video output device is optimal by comparing the set format information and the format information specified by the specifying means.
If the resolution of the format set in the video output device is not the maximum resolution, the accepting unit accepts whether or not the setting needs to be changed, and changes the setting to the maximum resolution format according to the acceptance result.

In the present invention, the display device detects a black belt portion included in a part of the video based on the video signal, and compares the area of the detected black belt portion with a predetermined value. When the area of the black belt portion is a predetermined value or more, the aspect ratio of the video signal output from the video output device is not appropriate. Therefore, the aspect ratio setting change accepting unit accepts whether or not the aspect ratio setting needs to be changed.
When the aspect ratio setting change accepting unit accepts the aspect ratio setting change, the setting information for changing the aspect ratio of the video signal output from the video output device is transmitted to the video output device, and the aspect ratio is transmitted to the video output device. Set to.

In the present invention, processing similar to that for video signals is performed for audio signals. In other words, the storage means stores a plurality of format information indicating formats that can be reproduced, and the acquisition means acquires from the video output device a plurality of format information indicating the format of an audio signal that can be output on the video output device side. To do.
Then, the specifying unit specifies one format corresponding to each of the display device and the video output device. Therefore, the user does not need to select one format from the audio format list, and knowledge about the audio format is also unnecessary. Next, setting information for setting the format of the audio signal to be output from the video output device based on the one format information specified by the specifying unit is transmitted to the video output device, and the format is transmitted to the video output device. Set.

In the present invention, the processing performed on the display device side is executed on the video output device side. That is, the video output device supports a plurality of formats, and can output video signals of each format. The storage means of the video output device stores a plurality of format information.
On the other hand, the display device supports a plurality of formats, and can display video based on video signals of each format. The acquisition unit of the video output device acquires a plurality of format information indicating each format that can be displayed on the display device from the display device.
Then, the specifying unit specifies one format corresponding to each of the display device and the video output device.
Next, the accepting unit accepts whether or not the format setting needs to be changed without displaying a list of formats corresponding to the display device and the video output device. Therefore, the user does not need to select one format from the format list, and knowledge about the format becomes unnecessary.
When the accepting unit accepts the setting change, the format of the video signal to be output from the video output device is set based on the one format information specified by the specifying unit.

  According to the present invention, even a user who has little knowledge about the format of a video signal can set an optimal format in the video output device only by selecting whether or not to change the setting.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram showing a configuration of a video display system according to an embodiment of the present invention. The video display system according to the present invention includes the display device 1 and the video output device 3 connected via the HDMI cable 4, and even the user who does not have knowledge of the video format can use the best video format corresponding to each device. It is configured so that it can be set easily.

  The display device 1 includes a control unit 10 that controls operations of various components constituting the display device 1, an HDMI communication unit 11, a signal separation unit 12, a black band portion detection unit 13, a video signal processing unit 14, and an OSD drawing unit 15. , A display unit 16, an audio signal processing unit 17, a speaker 18, a storage unit 19, and an operation unit 20.

  The control unit 10 is a microcomputer provided with a CPU (not shown), and mainly controls the operation of the HDMI communication unit 11, the black belt portion detection unit 13, and the OSD drawing unit 15, thereby performing a video format setting process described later. Do.

  The storage unit 19 is a non-volatile memory, and stores a plurality of pieces of video format information indicating video signal formats that can be displayed on the display device 1 side. The control unit 10 can specify the types of video formats that can be supported on the display device 1 side by reading the video format information stored in the storage unit 19. The video format information is, for example, EDID information, and indicates any video format such as 480i, 480p, 1080i, 720p, and 1080p.

  The HDMI communication unit 11 includes an HDMI terminal to which the HDMI cable 4 is connected, and is an interface capable of transmitting and receiving various types of information regarding video signals, audio signals, and video formats to and from the video output device 3. The HDMI standard interface has a plurality of channels, and video signals and audio signals are transmitted and received using TMDS (Transition Minimized Differential Signaling) channels. Video signals transmitted and received through the TMDS channel are RGB signals, component video signals, and the like. The video signal and audio signal received by the HDMI communication unit 11 are given to the signal separation unit 12. Further, in the HDMI standard, it is possible to transmit / receive information related to the format of the video signal using the CEC channel. Transmission / reception of the information is controlled by the control unit 10.

  The signal separation unit 12 separates the video signal and the audio signal received by the HDMI communication unit 11, gives the video signal to the black band detection unit 13, and gives the audio signal to the audio signal processing unit 17.

The black band part detection unit 13 detects a black band part, that is, a letterbox area included in a part of the video image signal, and provides the control unit 10 with information on the area of the detected black band part. Specifically, a portion in which the luminance level of the video signal is equal to or less than a predetermined value, for example, 0, that is, a portion that is continuous from the video start position of the video of the video signal and the one frame image, and the middle of the frame image A portion continuing to the video end position is detected as a black belt portion.
Further, the black belt portion detection unit 13 gives the video signal separated by the signal separation unit 12 to the video signal processing unit 14.
In addition, by providing the black band part detection unit 13 in the preceding stage of the video signal processing unit 14, it becomes possible to detect the black band part more accurately. When it is provided in the subsequent stage of the video signal processing unit 14, the contour is weakened by the video processing, and the boundary between the video area and the black belt portion is blurred, and as a result, the black belt portion may not be accurately detected. .
Further, the detection method of the black belt portion is not limited to the above-described method, and other methods may be adopted as long as the black belt portion can be detected.

  The video signal processing unit 14 converts the supplied video signal into a video signal that can be displayed on the display unit 16, executes predetermined various effect processing as necessary, and supplies the processed signal to the OSD drawing unit 15.

  The OSD drawing unit 15 is configured to display a specific image, for example, an image that accepts a format setting change of a video signal, a guidance image that guides the setting change, or the like in the video signal according to the control of the control unit 10. The signal is superimposed, and the superimposed video signal is given to the display unit 16. Specifically, the OSD drawing unit 15 combines an image generated by the OSD image generation unit with an OSD image generation unit (not shown) that generates a guide image and the video signal supplied from the video signal processing unit 14. It is composed of a synthesis unit.

  The display unit 16 is, for example, a liquid crystal display panel having a display surface with an aspect ratio of 16: 9 on the front side and forming a substantially rectangular parallelepiped. A direct-type backlight unit that illuminates the liquid crystal display panel from the rear side is disposed on the rear side of the liquid crystal panel, and an optical sheet is interposed between the backlight unit and the video display panel. The display unit 16 and the video signal processing unit 14 correspond to video signals of a plurality of video formats, for example, 480i, 480p, 1080i, 720p, and 1080p, and the display unit 16 displays video based on each video signal. Can do.

  The audio signal processing unit 17 performs signal processing such as amplification of the audio signal separated by the signal separation unit 12 and supplies the signal to the speaker 18. The speaker 18 reproduces sound based on the given sound signal.

  The operation unit 20 includes, for example, a light receiving unit that receives a remote operation signal and a remote operation device. The operation unit 20 accepts various operations such as channel, volume, and video format settings, and the control unit 10 controls operations of various components according to the operation content of the operation unit 20.

  Although only the configuration for displaying and reproducing the video signal and the audio signal received via the HDMI communication unit 11 has been described, the display device 1 includes a tuner (not shown) that receives a broadcast signal, a DVI terminal, a D terminal, and an RCA terminal. Are also provided, and are configured to output video and audio.

  The video output device 3 is, for example, a hard disk recorder, and includes a control unit 30 that controls operations of various components constituting the video output device 3, a storage device 31 that records video data, a signal processing unit 32, an HDMI communication unit 33, A storage unit 34 and an operation unit 35 are provided.

  The control unit 30 has the same configuration as the control unit 10 on the display device 1 side, and is a microcomputer that performs video signal and audio signal output, video signal format setting processing, and the like.

  The storage device 31 reads and reproduces video and audio data from a storage medium storing video and audio data, for example, a magnetic disk such as a hard disk, an optical disk such as a DVD and a BD, and outputs the reproduced video and audio signals. This is given to the processing unit 32.

  The signal processing unit 32 performs signal processing for converting the video signal into a specific video format according to the control of the control unit 10, and the HDMI communication unit 33 transmits the signal-processed video signal and audio signal to the display device 1. .

The storage unit 34 is a non-volatile memory, and stores a plurality of pieces of video format information indicating the format of a video signal that can be output from the video output device 3. The control unit 30 reads the format information stored in the storage unit 34 and transmits the format information to the display device 1 through the HDMI communication unit 33, thereby notifying the video format that can be supported on the video output device 3 side. .
Further, the storage unit 34 stores setting format information indicating the video format set in the video output device 3. The control unit 30 determines a video format to be output from the video output device 3 based on the set format information, and transmits a video signal of the video format to the display device 1.

  FIG. 2 is a flowchart showing a processing procedure of the control units 10 and 30 relating to video format setting, and FIG. 3 is an explanatory diagram showing a video format setting procedure. Hereinafter, a case where 480i is set in the video output device 3 as an output video format will be described. FIG. 3A schematically shows a 480i video displayed on the display device 1.

  As shown in FIG. 2, the control unit 10 acquires a plurality of pieces of video format information stored in the storage unit 34 from the video output device 3 (step S11). Specifically, the control unit 10 requests the video output device 3 to transmit the video format information by transmitting a predetermined command using the CEC channel. When receiving the control signal, the control unit 30 on the video output device 3 side reads a plurality of video format information from the storage unit 34 and transmits the read video format information to the display device 1 via the HDMI communication unit 33. . The control unit 10 of the display device 1 can acquire the video format information by receiving a plurality of video format information transmitted from the video output device 3.

Next, the control unit 10 reads a plurality of pieces of video format information from the storage unit 19 of the display device 1 (step S12), a plurality of pieces of video format information acquired from the video output device 3, and a plurality of pieces of video read from the storage unit 19. By comparing with the format information, the video format information of the maximum resolution is specified (step S13). In the present embodiment, since both the display device 1 and the video output device 3 support the 1080p video format, the 1080p video format information is specified.
As described above, by combining the video format information of both the display device 1 and the video output device 3, it becomes possible to specify the best video format in the combination of each device.

  Then, the control unit 10 acquires setting format information from the video output device 3 (step S14). The setting format information acquisition method is the same as the video format information acquisition method.

  Next, the control unit 10 determines whether or not the set format information matches the format information of the maximum resolution specified in step S13 (step S15). If it is determined that they match (step S15: YES), the control unit 10 finishes the process related to the setting of the video format.

  When it is determined that they do not match (step S15: NO), the control unit 10 displays on the display unit 16 that the OSD drawing unit 15 is not the best setting as shown in FIG. 3B (step S16). ), Accept the change of settings. In step S16, a list of video formats that can be supported by both the video output device 3 and the display device 1 is not displayed, only the best video format is displayed, and only the necessity of change is accepted. Therefore, even a user who lacks knowledge of the video format will not be confused about the selection of the video format. The video format setting change operation can be made extremely simple.

  And the control part 10 monitors the operation state of the operation part 20, and determines whether the setting change was received (step S17). When the setting change is not accepted, that is, when the “NO” block shown in FIG. 3B is selected by the operation unit 20 and the enter button is pressed (step S17: NO), the control unit 10 Then, the processing related to the setting of the video format is finished.

  When the setting is not changed, the same warning screen is displayed every time the video output device 3 is connected to the display device 1. In order to avoid the display of the warning screen, it may be configured so that the warning screen can be set to be displayed or hidden from the menu. Alternatively, an option such as “Do not display in the future” may be provided on the screen illustrated in FIG. 3B, and the warning screen may not be displayed thereafter when the “Do not display in the future” block is selected.

When it is determined that the setting change has been accepted, that is, when the “Yes” block shown in FIG. 3B is selected and the determination button is pressed (step S17: YES), the control unit 10 transmits the HDMI communication unit. 11, it is determined whether or not CEC communication related to the setting of the video format is possible (step S18). When it is determined that the CEC communication is possible (step S18: YES), the control unit 10 provides the video output device 3 with setting information for setting the video format of the maximum resolution specified in step S13 in the video output device 3. Transmit (step S19). The setting information includes the format information and a predetermined communication command.
When receiving the setting information transmitted from the display device 1, the video output device 3 changes the content of the setting format information so that the video signal is output in the video format of the maximum resolution based on the setting information. .

  Next, when the setting on the video output device 3 side is completed, the control unit 10 causes the display unit 16 to display a message indicating that the setting of the video format has been completed as shown in FIG. 3C (step S20). The process related to the setting of the video format is finished. Thereafter, as shown in FIG. 3D, 1080p video is displayed on the display unit 16.

When it is determined in step S18 that CEC communication is not possible (step S18: NO), for example, in the case of a connection method using a D terminal or the like that does not support a predetermined communication command, the control unit 10 displays the video format. In order to support the setting, the name of the connected device connected to the display device 1 is received (step S21), and a setting guide image corresponding to the connected device is displayed on the display unit 16 (step S22) to set the video format. This process is finished. The setting guide image prompts the user to change the setting so that the optimum video format corresponding to the combination of the display device 1 and the video output device 3 is changed in the video output device 3, and facilitates the setting work.
In addition, the control part 10 and the HDMI communication part 11 which perform the process of step S11 comprise the acquisition means. Moreover, the control part 10 which performs step S13 comprises the specific means. Further, the control unit 10 and the HDMI communication unit 11 that execute the process of step S14 constitute a setting format information acquisition unit. Furthermore, the control unit 10 that executes the process of step S15 constitutes means for comparing the set format information and the format information specified by the specifying means. Furthermore, the control unit 10 and the operation unit 20 that execute the process of step S17 constitute an accepting unit. Furthermore, the control unit 10 and the HDMI communication unit 11 that execute the process of step S19 constitute a setting information transmission unit.

  FIG. 4 is a flowchart showing the processing procedure of the control units 10 and 30 related to the aspect ratio setting change, FIG. 5 is an explanatory diagram showing the aspect ratio setting change procedure, and FIG. It is explanatory drawing shown in. In the following, it is a case where the setting on the video output device 3 side is 4 to 3 although the aspect ratio of the display device 1 is 16 to 9, and the scope size is as shown in FIG. A case where letterbox video is output will be described. The aspect ratio of the scope size is 1 to 2.35, and black bands are added to the top and bottom to form a 16 to 9 image. In the video output device 3, the aspect ratio of the video to be output is set to 4 to 3. Therefore, the video output device 3 converts the 16: 9 video into a 4: 3 letterbox video in which a black band portion is further added, and outputs the video signal of the letterbox video to the display device 1. When the display device 1 receives a 4 to 3 video signal, for example, the 4 to 3 video is horizontally stretched and converted into a 16 to 9 video, and the video as shown in FIG. indicate.

  In the control unit 10, the black band detection unit 13 detects a black band part included in a part of the video image (step S31), and calculates the area of the black band part (step S32). The area is calculated, for example, as a ratio when the area of the entire screen area is 1. As shown in FIG. 6A, when a scope-size image is displayed on the display device 1 having an aspect ratio of 4 to 3, the ratio x of the image area is 2.35: 1 = 1.33 (= 4 · 3): x, and the video area ratio x is x = 1.33 / 2.35 = 0.666. Therefore, the area of the black belt portion is about 0.44.

  Next, the control unit 10 determines whether or not the area of the black belt portion is larger than a predetermined value (step S33). The predetermined value is, for example, 0.25. 0.25 is an area of a black belt portion that appears when a scope-sized image is displayed on the display device 1 having an aspect ratio of 16: 9. As shown in FIG. 6B, when a scope-sized image is displayed on the display device 1 having an aspect ratio of 16: 9, the ratio x of the image area is 2.35: 1 = 1.78 (= 16 / 9): x, and the video area ratio x is x = 1.78 / 2.35 = 0.757. Therefore, the area of the black belt portion is about 0.25.

  When it determines with it being below a predetermined value by step S33 (step S33: NO), the control part 10 complete | finishes the process which concerns on the setting change of an aspect ratio.

  When it is determined that the area of the black belt portion is larger than the predetermined value (step S33: YES), for example, as shown in FIG. 5A, the area of the black belt portion of the letterbox is 0.44 with respect to 0.25. If the value is clearly a large value, as shown in FIG. 5B, the control unit 10 displays on the display unit 16 that the setting is not the best (step S34), and accepts the change of the setting.

  And the control part 10 monitors the operation state of the operation part 20, and determines whether the setting change was received (step S35). When the setting change is not accepted (step S35: NO), that is, when the “No” block shown in FIG. 5B is selected by the cursor and the enter button is pressed, the control unit 10 sets the aspect ratio. Finish the process related to the change.

When it is determined that the setting change has been accepted (step S35: YES), that is, when the “Yes” block shown in FIG. 5B is selected by the cursor and the determination button is pressed, the control unit 10 displays the HDMI communication unit. 11 determines whether or not CEC communication related to the video format setting is possible (step S36). When it is determined that CEC communication is possible (step S36: YES), the control unit 10 transmits predetermined setting information for instructing a change in setting of the aspect ratio to the video output device 3 (step S37).
When receiving the setting information transmitted from the display device 1, the video output device 3 changes the aspect ratio setting based on the setting information.

Next, when the setting on the video output device 3 side is completed, the control unit 10 causes the display unit 16 to display a message indicating that the aspect ratio setting change has been completed as shown in FIG. 5C (step S38). Then, the processing related to the setting of the video format is finished. Thereafter, as shown in FIG. 5D, a letterbox image having a scope size in which the aspect ratio is appropriately set is displayed on the display unit 16.
When the 16: 9 aspect ratio is set in the video output device 3, as shown in FIG. 6B, a 16: 9 scope-sized letterbox video is output and displayed on the display unit 16 as it is. The area of the black belt portion occupying the whole can be reduced.

If it is determined in step S36 that CEC communication is not possible (step S36: NO), the control unit 10 accepts the name of the connected device connected to the display device 1 to support setting of the aspect ratio (step S39). ), A setting guide image corresponding to the connected device is displayed on the display unit 16 (step S40), and the processing relating to the setting of the aspect ratio is completed.
The black band detection unit 13 constitutes a detection unit that detects a black band part. Moreover, the control part 10 which performs step S33 comprises the means which compares the area of a black belt part, and a predetermined value. Furthermore, the control unit 10 and the operation unit 20 that execute step S35 constitute an aspect ratio change receiving unit. Furthermore, the control unit 10 and the HDMI communication unit 11 that execute step S <b> 37 constitute means for transmitting setting information for changing the aspect ratio to the video output device 3.

In the display device 1 and the video display system configured as described above, it is not necessary to select a video format from the list, and even a user who has little knowledge about the format of the video signal selects whether to change the setting. Thus, an optimal video format that maximizes the specifications of both the display device 1 and the video output device 3 can be set in the video output device 3.
Specifically, a video format with the maximum resolution can be set in the video output device 3.

  Even if an incorrect aspect ratio is set on the video output device 3 side, the setting error can be detected and corrected on the display device 1 side.

On the other hand, in a conventional display device, when a user who has owned a CRT TV with an aspect ratio of 4 to 3 replaces a liquid crystal TV with an aspect ratio of 16 to 9, and continues to use the video output device 3 as it is, There has been an example in which the video format setting change on the video output device 3 side is forgotten and an optimal video is not displayed.
Also, some video output devices 3 are set by default for the 4-to-3 display device 1, and there are cases where they are used as they are without noticing that setting changes are necessary.
According to the present invention, since the above-described problems that occur when only the display device 1 is replaced without changing the video output device 3 can be avoided in advance, user calls can be reduced.

  In the embodiment, it is configured to determine the suitability of the video format based on the video format information. However, the suitability of the video format is determined based on the number of synchronization signals, the interval, etc. When the synchronization signal is received, it may be configured to warn that there is an abnormality in the setting on the video output device side. The user can recognize that there is no abnormality in the display device and there is an abnormality in the setting on the video output device side, and can reduce user calls of the display device.

(Modification 1)
The video display system according to the modified example 1 is configured to change the setting of the audio format in the same procedure in addition to the video format.
FIG. 7 is a flowchart showing a processing procedure of the control units 10 and 30 relating to the audio format setting. The storage unit 19 of the display device 1 stores a plurality of audio format information indicating compatible audio formats. The audio format information is information indicating, for example, the number of channels corresponding to stereo, 5.1ch, Dolby digital audio support, DTS audio support, PCM support, and the like.
Similarly, the storage unit 34 of the video output device 3 stores a plurality of audio format information that can be handled, and set audio format information indicating the currently set audio format.

  The control unit 10 acquires a plurality of audio format information stored in the storage unit 34 from the video output device 3 (step S51). Next, the control unit 10 reads a plurality of audio format information from the storage unit 19 of the display device 1 (step S52), and a plurality of audio format information acquired from the video output device 3 and a plurality of audio formats read from the storage unit 19. By comparing with the format information, the optimum audio format information, for example, the audio format information having the maximum number of channels or information bits is specified (step S53).

  Then, the control unit 10 acquires set audio format information from the video output device 3 (step S54). Next, the control unit 10 determines whether or not the set audio format information matches the one format information specified in step S53 (step S55). If it is determined that they match (step S55: YES), the control unit 10 finishes the process related to the setting of the audio format.

  If it is determined that they do not match (step S55: NO), the control unit 10 displays on the display unit 16 that the setting is not the best (step S56), and accepts a change in setting. In step S56, a list of audio formats that can be supported by both the video output device 3 and the display device 1 is not displayed, only the best audio format is displayed, and only the necessity of change is accepted.

  And the control part 10 monitors the operation state of the operation part 20, and determines whether the setting change was received (step S57). When the setting change is not accepted (step S57: NO), the control unit 10 finishes the process related to the setting of the audio format.

When it is determined that the setting change has been received (step S57: YES), the control unit 10 determines whether or not CEC communication related to the audio format setting is possible based on the communication state of the HDMI communication unit 11 ( Step S58). When it is determined that the CEC communication is possible (step S58: YES), the control unit 10 sets setting information for setting the optimum audio format information specified in step S53 in the video output device 3. 3 (step S59). The setting information includes the format information and predetermined command information.
When receiving the setting information transmitted from the display device 1, the video output device 3 changes the content of the set audio format information so that the one audio format is output based on the setting information.

Next, when the setting on the video output device 3 side is completed, the control unit 10 displays a message indicating that the audio format setting is completed on the display unit 16 (step S60), and ends the process related to the audio format setting. . When it is determined in step S58 that CEC communication is not possible (step S58: NO), the control unit 10 accepts the name of the connected device connected to the display device 1 in order to support the setting of the audio format (step S61). ), A setting guide image corresponding to the connected device is displayed on the display unit 16 (step S62), and the processing relating to the setting of the audio format is completed.
In addition, the control part 10 which performs the process of step S53 comprises the audio | voice format specific | specification means. In addition, the control unit 10 and the HDMI communication unit 11 constitute a unit that transmits setting information set based on one format information specified by the audio format specifying unit to the video output device 3.

  In the display device 1 and the video display system according to the first modification, it is not necessary to select an audio format from the list, and even a user who has little knowledge about the format of the audio signal selects whether or not to change the setting. You can set it to the optimal format just by doing.

(Modification 2)
FIG. 8 is a flowchart illustrating a processing procedure of the control units 10 and 30 according to the second modification. The video display system according to the modified example 2 is configured to execute determination and setting processing of the best audio format on the video output device 3 side.

  The control unit 30 of the video output device 3 acquires a plurality of video format information stored in the storage unit 19 from the display device 1 (step S71). Next, the control unit 30 reads a plurality of pieces of video format information from the storage unit 34 of the video output device 3 (step S72), and a plurality of pieces of video format information acquired from the display device 1 and a plurality of videos read from the storage unit 34. By comparing with the format information, the video format information of the maximum resolution is specified (step S73).

  And the control part 30 reads setting format information from the memory | storage part 34 (step S74). Next, the control unit 30 determines whether or not the set format information matches the format information of the maximum resolution specified in step S73 (step S75). If it is determined that they match (step S75: YES), the control unit 30 finishes the process related to the setting of the video format.

  If it is determined that they do not match (step S75: NO), the control unit 30 displays that the setting is not the best on the display device 1 (step S76), and accepts a change in setting. And the control part 30 monitors the operation state of the operation part 35, and determines whether the setting change was received (step S77). When the setting change is not accepted (step S77: NO), the control unit 30 finishes the process related to the setting of the video format.

When it is determined that the setting change has been accepted (step S77: YES), the control unit 30 sets the video format of the maximum resolution specified in step S73 (step S78), and displays a message indicating that the video format setting has been completed. The information is displayed on the device 1 (step S79), and the process is terminated.
The control unit 30 and the HDMI communication unit 33 that execute step S71 function as an acquisition unit according to a seventh aspect. Moreover, the control part 30 which performs step S73 functions as a specifying means according to claim 7. Furthermore, the control unit 30 and the operation unit 35 that execute the process of step S77 constitute a receiving unit. Furthermore, the control unit 30 executing step S78 constitutes means for setting the format of the video signal to be output based on the one format information specified by the specifying means.

  In the video output device 3 and the video display system according to Modification 2, even if the user has little knowledge about the format of the video signal, it is only necessary to select whether or not to change the setting, as in the above-described embodiment. It can be set to the optimal format.

(Modification 3)
FIG. 9 is an explanatory diagram conceptually showing the aspect ratio setting changing method according to the third modification. An aspect ratio setting support method when mutual communication is impossible between the display device 1 and the video output device 3 will be additionally described. Even when an analog video signal is input from the video output device 3 to the display device 1 via a cable that cannot communicate with each other, the control unit 10 performs the same processing as steps S31 to S35 in FIG. An error in setting the aspect ratio as shown in 9 (a) can be detected. The control unit 10 causes the display unit 16 to display an image indicating the possibility that the aspect ratio is set incorrectly as shown in FIG. 9B.

  As long as mutual communication is not possible, the control unit 10 cannot execute the processing after step S36 in FIG. Therefore, when the control unit 10 accepts a setting change, the control unit 10 responds by displaying a guidance indicating the aspect ratio setting procedure, as shown in FIGS. The guidance displays that there is no problem at least on the display device 1 side or that there is a problem on the video output device 3 side.

  In the display device 1 according to the modified example 3, it is possible to support setting of an aspect ratio by a user who is poor in knowledge of the aspect ratio. In particular, it is possible to reduce user calls of the display device 1 by pointing out that there is no problem on the display device 1 side and a problem on the video output device 3 side.

In FIG. 9C, the guidance is displayed at the bottom of the video, but may be displayed at any location as long as the menu display of the video display device 1 is not hindered.
For convenience, when a channel up / down key provided in the remote control device of the video display device 1 is pressed during guidance display, the next guidance screen may be displayed.

  It should be understood that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a block diagram which shows the structure of the video display system which concerns on embodiment of this invention. It is a flowchart which shows the process sequence of the control part which concerns on a video format setting. It is explanatory drawing which shows the setting procedure of a video format. It is a flowchart which shows the process sequence of the control part which concerns on the setting change of an aspect ratio. It is explanatory drawing which shows the setting change procedure of an aspect ratio. It is explanatory drawing which shows notionally correct / wrong of aspect ratio setting. It is a flowchart which shows the process sequence of the control part which concerns on audio | voice format setting. 10 is a flowchart illustrating a processing procedure of a control unit according to Modification 2. It is explanatory drawing which shows notionally the setting change method of the aspect ratio which concerns on the modification 3. FIG.

Explanation of symbols

32 Signal processing unit 10, 30 Control unit 1 Display device 10 Control unit 11 HDMI communication unit 12 Signal separation unit 13 Black belt part detection unit 14 Video signal processing unit 15 OSD drawing unit 16 Display unit 17 Audio signal processing unit 18 Speaker 19 Storage Unit 20 operation unit 3 video output device 30 control unit 31 storage device 33 HDMI communication unit 34 storage unit 35 operation unit 4 HDMI cable

Claims (8)

A video signal output from the video output device in a specific format is set in the video output device by transmitting and receiving the format information of the video signal to and from the video output device that outputs the video signal in a plurality of formats. In a display device that receives and displays video,
Storage means for storing a plurality of format information indicating video signal formats that can be displayed;
Acquisition means for acquiring, from the video output device, a plurality of format information indicating video signal formats that can be output on the video output device side;
A plurality of format information acquired by the acquisition means and a plurality of format information stored in the storage means, and specifying means for specifying one format information that can be output and displayed;
An accepting means for accepting the necessity of changing the format setting;
A setting for transmitting, to the video output device, setting information for setting the format of the video signal output from the video output device based on the one format information specified by the specifying device when the accepting unit accepts the setting change. A display device comprising: an information transmission unit. The format information includes information indicating resolution,
The specifying means is:
The display device according to claim 1, wherein format information of a maximum resolution that can be output and displayed is specified. Setting format information acquisition means for acquiring setting format information indicating the format set on the video output device side;
Means for comparing the setting format information acquired by the setting format information acquisition means and the format information specified by the specifying means;
The accepting means is
The display device according to claim 2, wherein if the resolution of the setting format information is lower than the resolution of the format information specified by the specifying means, the necessity of setting change is received. Detection means for detecting a black belt portion included in a part of the video based on the video signal;
Means for comparing the area of the black belt portion and a predetermined value when the detection means detects the black belt portion;
If it is determined that the area of the black belt portion is equal to or greater than a predetermined value, an aspect ratio setting change accepting unit that accepts whether or not an aspect ratio setting change related to a video signal output from the video output device is required;
Means for transmitting setting information for changing the aspect ratio of the video signal output from the video output device to the video output device when the aspect ratio setting change receiving means receives the aspect ratio setting change. The display device according to any one of claims 1 to 3, wherein the display device is characterized. The storage means
A plurality of format information indicating the formats of audio signals that can be reproduced are stored,
The acquisition means includes
Means for acquiring from the video output device a plurality of format information indicating the format of an audio signal that can be output on the video output device side;
Furthermore, the audio format specifying means for comparing the plurality of format information acquired by the acquisition means and the plurality of format information stored in the storage means to specify one format information of the audio signal that can be output and reproduced When,
And a means for transmitting to the video output apparatus setting information for setting the format of the audio signal output from the video output apparatus based on the one format information specified by the audio format specifying means. The display device according to any one of claims 1 to 4. A display device according to any one of claims 1 to 5,
A video output device for outputting a video signal,
The video display system, wherein the display device and the video output device transmit and receive a video signal, format information, and setting information through an HDMI cable. In a video output device that sets a specific format by sending and receiving format information of a video signal to and from a display device that displays video based on the video signal, and outputs the video signal to the display device in the format,
Storage means for storing a plurality of format information indicating formats of video signals that can be output;
Acquisition means for acquiring a plurality of format information indicating the format of a video signal that can be displayed on the display device side;
A plurality of format information acquired by the acquisition means and a plurality of format information stored in the storage means, and specifying means for specifying one format information that can be output and displayed;
An accepting means for accepting the necessity of changing the format setting;
And a means for setting the format of the video signal to be output based on the one format information specified by the specifying means when the receiving means receives the setting change. A display device for displaying video based on the video signal;
A video output device according to claim 7,
The video display system, wherein the display device and the video output device transmit and receive a video signal and format information through an HDMI cable.

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