JPH0784563A - Multi-screen display system - Google Patents

Abstract

PURPOSE:To realize a presentation with a high display effect in a multi-screen display system by displaying video with signal sources different from each other on individual displays not only displaying the video of the same signal source on individual displays constituting a multi-screen and independently controlling the video on the optional display; CONSTITUTION:Image data storage memories are incorporated in respective display units 1-4 provided corresponding to individual displays 11-14 constituting the multi-screen, and LD reproducing devices 21-23 are attached, and any one of a still image taken out from the memory and a moving image reproduced by the reproducing device is selected, and is displayed on the corresponding display, and such a display operation in the whole display units are performed synchronizedly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen display system. More specifically, it comprises a plurality of display units, a plurality of displays provided corresponding to each of the display units in a one-to-one relationship, and a system controller for collectively controlling the plurality of display units. The present invention relates to a multi-screen display system in which a plurality of displays as a whole form a large screen (multi-screen).
The present invention relates to such a multi-screen display system in which the screen size can be freely adjusted depending on the number of the display units and the displays provided corresponding thereto.

[0002]

2. Description of the Related Art Conventionally, as a device for obtaining a large-screen image, there is, for example, a projection type projection device.
The screen is dark and it takes time to install and adjust. Further, as a substitute, there is a rear projection device, but it has a drawback that the depth is deep and the installation is not easy and expensive.

Therefore, in the prior art (multi-screen display device) disclosed in Japanese Unexamined Patent Publication No. 3-107192, a plurality of display devices are taken as a group, and an image is enlarged and projected on the display device to display a large-screen image as a whole. It proposes a multi-screen display device capable of returning to the system in an optimum manner when an abnormality occurs in a part of the system constituting the multi-screen display device.

[0004]

However, in the above-mentioned conventional technique (multi-screen display device), the signal from a single signal source is enlarged and displayed on a multi-screen. On the screen (display) of, the video signals (still images and moving images) from different signal sources can be freely interwoven and smoothly switched and displayed, and no technology has been considered to realize a presentation with a rich display effect. It was

An object of the present invention is to enable video signals (still images and moving images) from different signal sources to be freely interwoven and smoothly displayed on individual screens (displays) constituting a multi-screen, All screens that make up a multi-screen, such as sometimes displaying a single high-definition unified screen with the multi-screen as a large screen, and sometimes suddenly switching completely independent screens to some of the screens that make up the multi-screen. Can be used as a single screen, or as an independent screen, or in the middle, a part of each screen is independent and the rest is a unified screen. It is to provide a multi-screen display system capable of realizing a rich presentation.

[0006]

In order to achieve the above object, the present invention comprises a plurality of display units and a plurality of displays provided in a one-to-one relationship with each of the display units. Each display displays a video signal supplied from a corresponding display unit, and the individual displays collectively form a multi-screen as a large screen, and the plurality of displays are collectively controlled. System controller to
In a multi-screen display system consisting of

A reproducing device for a video signal recording medium is arranged in a one-to-one relationship with each of the display units, and each of the display units stores a frame memory for storing image data to be displayed. A conversion means for converting the image data read from the frame memory into a video signal and outputting the video signal; and a video signal output from the conversion means as a first video signal, which is arranged corresponding to the unit. When the video signal reproduced from the video signal recording medium reproducing device is used as the second video signal, both of them are taken in, one of them is selected, and output to the display provided corresponding to the own unit. And at least a video signal switching means for switching.

Further, each display unit receives and stores that various control information including control information for controlling the operation of the video signal recording medium reproducing apparatus corresponding to its own unit is transferred from the system controller. A storage means is provided.

[0009]

According to the multi-screen display system of the present invention, each of the display units of the same number as the number of individual screens (small screens, displays) constituting the multi-screen has its own video signal recording medium reproducing apparatus. Since a display device (for example, a laser disk reproducing device) is attached, each display unit reproduces a video signal (for example, a still image) read from the built-in frame memory and a video signal recording medium reproducing device dedicated to the own unit. Video signal (for example, video)
, And can be output by switching to a display (small screen) belonging to its own unit for display.

Since the system controller collectively controls all the display units and instructs the operation procedure of each display unit to each display unit, each display unit operates in synchronization with each other, and accordingly each display unit is operated. The respective displays (small screens) to which they belong perform display operations in synchronization with each other.

For example, if there are four sets of display units in total, there are four sets of video signal recording medium reproducing devices and four sets of displays (small screens). If you share and record the small screen of 1/4 each obtained by dividing the large screen of 4 (that is, upper left 4 half, lower left 4 half, upper right 4 half, lower right 4 half) It is possible to display one high-definition large screen on a large screen composed of four sets of displays (small screens).

Alternatively, if the video signals of independent contents are recorded and reproduced in the four sets of video signal recording medium reproducing devices, the video images of independent contents are displayed on the four sets of displays (small screens). Can be displayed. Also, in the middle, that is, 1/2 obtained by dividing one screen into two in two sets of four sets of video signal recording medium reproducing devices.
Each of the small screens (that is, the left half and the right half) is shared and recorded and played back, and the video signals of the independent contents are recorded in each of the remaining two sets of video signal recording medium playback devices. You can also play it back.

Moreover, the content displayed on each display (small screen) is not only the reproduction signal (for example, a moving image) from the video signal recording medium reproducing device, but also the video signal (from the memory built in each display unit). For example, since a still image is also included, as a combination of display contents on a large screen composed of a set (whole) of each display (small screen),
Various combinations are possible, and it is easy to realize extremely powerful presentations.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a multi-screen display system having a four-sided structure as a first embodiment of the present invention.

In the figure, 1 to 4 are display units, 10 is a system controller, 21 to 24 are reproducing devices, 11 to 14 are displays (small screens), 31 to 34 are LDs (laser disks), respectively. 41 to 44 are video signals, 50 is SCSI.
(Small Computer System In
interface) bus, 61-64 are RS23 respectively
It is a 2C bus.

In the display unit 1, a reproduction device 21 of the LD 31 and a display 11 are arranged in a one-to-one relationship, and in the display unit 2, a reproduction device 22 of the LD 32 and a display 12 are respectively arranged. The display units 3 are arranged in a one-to-one relationship, and in the same manner, the display device 3 includes the reproduction device 23 of the LD 33 and the display 13.
They are arranged in a one-to-one relationship, and the display unit 4 includes a playback device 24 for the LD 34 and a display 14
Are arranged in a one-to-one relationship with each other. The displays 11 to 14 form a large screen (multi-screen) as a whole.

Each display unit, for example, the display unit 1
Is a video signal read from the built-in frame memory,
The reproduction device 21 is controlled to select either one of the video signal reproduced from the LD 31 and output to the display 11 for display. The same applies to the other display units. The operation procedure of each display unit is from the system controller 10 to S
It is provided via the CSI bus 50. Therefore, each of the display units 1 to 4 operates in synchronization with each other, and each of the displays 11 to 14 also performs display in synchronization with each other.

In the multi-screen display system, as already described, each display unit has its own display, and each display is connected to the corresponding display unit. In the example described with reference to FIG. There were four, but there were six, nine, twelve,
There may be 16 or more, and a large screen (multi-screen) can be configured by combining a plurality of display units in this way.

As the display, a display device as a unit using a CRT (cathode ray tube) or a rear projection type projector can be used. However, by combining a plurality of display devices, a large screen display can be obtained as a multi-screen display system. Will be possible. The display units 1 to 4 are connected to the system controller 10 by the SCSI bus 50,
The playback devices 21 to 24 are connected to the corresponding display units 1 to 4 by the RS232C bus 60.

FIG. 2 is a block diagram showing details of the display unit 1 in FIG. In FIG. 1, since the display units 1 to 4 have the same configuration, in FIG.
The display unit 1 among them is taken up and the details are shown.

In FIG. 2, the same parts as those in FIG. 1 are designated by the same reference numerals. In addition, display unit 1
In the figure, 70 is an internal bus, 101 is a frame memory, and 10
2 is a D / A conversion circuit, 103 is a video signal switching circuit, 10
4 is a CRT controller, 105 is a ROM, 106 is an R
AM, 107 is a CPU, 108 is a SCSI controller, and 109 is a playback device I / F.

The frame memory 101 is a storage device (video RAM) for storing image data to be displayed and is a readable and writable storage device. D / A conversion circuit 102
Is a circuit that converts the digital image data read from the frame memory 101 into an analog video signal that can be displayed on a display. The video signal switching circuit 103 selects one of the analog video signal output from the D / A conversion circuit 102 and the video signal sent from the playback device 21 as the playback output of the LD 31, and displays it on the display 11. A circuit for selecting and switching between both video signals for output.

The video signal 41 selected and output by the video signal switching circuit 103 is sent to the display 11 and displayed as an image. Providing a plurality of frame memories enables a single display unit to store a plurality of different image data. CRT controller 10
Reference numeral 4 is a controller that performs generation of read / write addresses for the frame memory 101 that stores image data, control of read / write operations, and the like.

The ROM 105 is a read-only memory that stores a program for controlling the operation of the CPU 107. The RAM 106 stores the control data (operation procedure manual) necessary for the CPU 107 to control the display unit 1 and the playback device 21 from the system controller 10 into the SCS.
It is a readable / writable memory for storing this when given through the I bus.

The SCSI controller 108 is an S connecting the display unit 1 and the system controller 10.
It is a controller that controls the CSI protocol. The playback device I / F 109 includes the display unit 1 and the playback device 21.
Is an interface unit for connecting to and through the bus 61 and for controlling the operation of the reproducing apparatus 21. The internal bus 70 includes a CPU 107, a ROM 105, and a RAM 106.
It is a bus for connecting addresses, data, control, etc.

Next, the image display operation will be described. As one mode of the image display operation, the system controller 1
A case where image data is transferred from 0 to the display unit 1 and displayed will be described.

First, the system controller 10 sends image data to the display unit 1 via the SCSI bus 50. In the display unit 1, the sent image data is
SCSI controller 108, internal bus 70, and C
Through the RT controller 104, the frame memory 10
Store in 1. Then, the CRT controller 104
Then, the image data is read from the frame memory 101 and converted into a video signal by the D / A conversion circuit 102. Then, the CPU 107 commands the video signal switching circuit 103 via the internal bus 70 to switch and set the switching to the D / A conversion circuit 102 side, whereby the image data transferred from the system controller 10 is It is sent to the display 11 and displayed.

Next, the image display operation when reproducing and displaying the video signal recorded on the LD (laser disk) 31 will be described. The system controller 10
Control information for controlling the operation of the playback device 21 is transferred to the display unit 1 via the SCSI bus 50.

In the display unit 1, the CPU 107 stores the transferred control information in the RAM 106 via the SCSI controller 108, and based on the control information stored therein, via the playback device I / F section 109. Then, the operation of the reproducing device 21 is controlled. Then, by setting the switching in the video signal switching circuit 103 to the side of the reproduction device 21, the video signal from the reproduction device 21 (the video signal reproduced by the reproduction device 21 from the LD 31) is displayed on the display 11.

That is, from the system controller 10,
To any display unit among multiple display units,
Transferring the image data and displaying the image data, and transferring the operation control information of the reproducing device from the system controller 10 to the display unit, and transmitting the image data to the reproducing device.
It is possible to easily select to reproduce D and display the reproduced video signal. System controller 1
Transfer image data from 0 to a display unit,
If the operation control information of the reproducing apparatus is transferred to the other display unit, the control for switching and displaying the video signal from the different signal source for each display unit, that is, for each display, is performed for each display unit. Can be done independently.

It goes without saying that the image data and the video signal recorded in the LD are created and recorded in consideration of the overscan portion of the display.

FIG. 3 is an explanatory diagram showing the relationship between the video signal output from each display unit and the display state of the display at that time in the embodiment shown in FIG. In the figure, numbers 15a to 15h are multi-displays having a four-sided structure, and show the screen display state at that time.

In FIG. 3, between times t0 and t1,
Since the display units 1 to 4 output the video signals A1 to A4, the display state of the display at that time is as shown in 15a. Between times t1 and t2, only the display unit 1 is switched to output the video signal M1, so that the display state of the display at that time is as shown in 15b. It will be understood from FIG. 3 that various display states are possible by switching the video signals output from the display units 1 to 4 in the same manner.

FIG. 4 is a flow chart showing the flow of the operation of switching the image display state of the four-panel multi-display shown in FIG. In FIG. 4, numbers 401 to 40
Reference numeral 7 indicates the contents of the processing.

Hereinafter, referring to FIGS. 1, 3 and 4,
The operation of switching the image display state of the multi-display having four screens will be described.

(Step 401) Of the image data A composed of A1, A2, A3 and A4, the system controller 10 sends A1 to the display unit 1, A2 to the display unit 2 and A3 to the display unit 3. , A4 to the display unit 2, respectively. Then, each of the display units 1 to 4 that received the transfer receives the received images A1, A2, A.
A video signal corresponding to 3, or A4 is output to the display. As a result, the multi-display 15a is obtained.

(Step 402) At time t1, the system controller 10 causes the display unit 1 to display the reproducing device 21.
The control information for controlling the operation of is transferred. Then, the display unit 1 outputs the operation control information to the reproducing device 21 and sets the output video signal on the reproducing device 21 side.
The video signal M1 obtained by reproducing is output and displayed on the display 11. As a result, multi-display 1
5b is obtained.

(Step 403) At time t2, the system controller 10 causes the display unit 2 to display the reproducing device 22.
The control information for controlling the operation of is transferred. Then, the display unit 2 outputs the operation control information to the reproducing device 22 and sets the output video signal on the reproducing device 22 side.
The video signal M2 obtained by reproducing is output to and displayed on the display 12. As a result, multi-display 1
5c is obtained.

(Step 404) At time t3, the system controller 10 displays B1 of the image data B composed of B1, B2, B3 and B4 on the display unit 1.
, B3 to display unit 3, B4 to display unit 4
To, respectively. Then, each of the display units 1, 3, 4 that has received the transfer outputs a video signal corresponding to the received image B1, B3, B4 to the display. As a result, the multi-display 15d is obtained.

(Step 405) At time t4, the system controller 10 causes the display unit 2 to display B1, B2,
Of the image data B composed of B3 and B4, B
Transfer 2. Further, control information for controlling the operation of the reproducing device 23 is transferred to the display unit 3. In the display unit 3, by outputting the operation control information to the reproducing device 23 and setting the output video signal to the reproducing device 23 side, in the display unit 3, the image obtained by the reproducing device 23 reproducing the LD 33. The signal M3 is output to the display 13 and displayed. As a result, the multi-display 15e is obtained.

(Step 406) At time t5, the system controller 10 causes the display unit 4 to display the reproducing device 24.
The control information for controlling the operation of is transferred. Then, the display unit 4 outputs the operation control information to the reproducing device 24 and sets the output video signal on the reproducing device side, so that the reproducing device 24 reproduces the LD 34 to obtain the display unit 4. The video signal M4 is output to the display 14 and displayed. As a result, the multi-display 15f is obtained. Further, at time t6, the display unit 3 switches the video signal to the original image data B3 after the video signal from the reproducing device 23 is completed. As a result, a multi-display 15g is obtained.

(Step 407) At time t7, the system controller 10 displays C1 of the image data C composed of C1, C2, C3 and C4 on the display unit 1.
, C2 to display unit 2, C3 to display unit 3
, And C4 to the display unit 2, respectively. Then, each of the display units 1 to 4 that has received the transfer outputs a video signal corresponding to the received image C1, C2, C3, or C4 to the display. As a result, multi-display 15
h is obtained.

As described above, according to the present embodiment (a multi-screen display system having four screens), it is possible to display an extremely varied dynamic screen under the control of the system controller 10. Therefore, it will be understood that a presentation having a high display effect can be realized by selecting the image data to be displayed and the reproduction video signal to be displayed.

FIG. 5 is a block diagram showing the overall construction of a multi-screen display system as a second embodiment of the present invention. 5, the same elements as those in FIG. 1 are designated by the same reference numerals. The second embodiment of the present invention shown in FIG. 5 is different from the embodiment shown in FIG. 1 in that an MO drive 80 is connected to the system controller 10 via a SCSI bus 50, and an MO disk (magneto-optical) is connected. Disk) 81
The image data is recorded in, reproduced from here, and transferred to the display unit.

If the amount of data transferred from the system controller 10 to each display unit is large, it becomes difficult to hold the data in the system controller 10.
The MO drive 80 and the MO disk 81 are used as the external storage device, and the data to be transferred is stored therein.

FIG. 6 is a flow chart showing the operation flow of the second embodiment (multi-screen display system) of the present invention shown in FIG. In FIG. 6, reference numerals 601 to 609 indicate the contents of processing. Hereinafter, with reference to FIG. 3, FIG. 5, and FIG. 6, a flow of operation when only the display unit 1 is focused (a mode of continuous image display change in the display unit 1) will be described as an operation example.

(Step 601) The system controller 10 transfers the control information to the display unit 1. (Step 602) At time t0, the system controller 10 outputs timing information to the display unit 1.

(Step 603) Based on the control information, the display unit 1 sends the image data A1 from the MO drive 70.
To the internal frame memory. (Multi-Display 15a) (Step 604) At time t1, the system controller 10 outputs timing information to the display unit 1.

(Step 605) Based on the control information, the display unit 1 instructs the reproducing device 21 to reproduce the image M1, and switches the image signal. (Multi display 15
b) (Step 606) At time t3, the system controller 10 outputs the timing information to the display unit 1.

(Step 607) The display unit 1 sends the image data B1 from the MO drive 70 based on the control information.
Is taken into the internal frame memory and the video signal is switched. (Multi Display 15d) (Step 608) At time t7, the system controller 10 outputs timing information to the display unit 1.

(Step 609) Based on the control information, the display unit 1 sends the image data C1 from the MO drive 70.
To the internal frame memory. (Multi display 15h)

Although the case of controlling the display unit 1 has been described above, the system controller 10 can simultaneously display images from different signal sources on the multi-screen by controlling the display units 2 to 4 in the same manner. It will be possible. Further, in the above configuration, although the MO drive is required, there is an advantage that the communication processing time of the control information between the system controller and the display unit can be shortened by transferring the control information in advance.

FIG. 7 shows the control information given to each display unit when the second embodiment of the present invention shown in FIG. 5 executes the flow of the image display operation shown in FIG. Please refer because it is an explanatory diagram.

The control information is prepared for all the display units, and the content of the processing to be executed is indicated in order in each control information by the timing information from the system controller. When the display unit receives the timing information, the control information is controlled. The processing is sequentially started from the beginning of the information, and after the processing is completed, the pointer is moved to the control information to be executed at the next timing information.

As described above, the processing of the system controller is reduced by preparing the control information indicating the processing contents at each timing in advance for each display unit. Further, in the embodiments described so far, the system controller and each display unit and the MO drive are connected by the SCSI bus, but a general-purpose bus may be used instead of the SCSI bus.

FIG. 8 shows that one screen (large screen) is divided into quarters,
It is explanatory drawing which showed the relationship between a reproduction | regeneration video signal and a display state when it divides into four small screens and each small screen is recorded on four LDs. In FIG. 8, numbers 15i to 15l are
Each is a multi-screen (large screen).

Hereinafter, the video signal L corresponding to one screen (large screen) is divided into four parts L1, L2, L3 and L4, each of which is recorded in four separate LDs, and one screen ( Similarly, each of the video signals M, N, and P corresponding to a large screen is similarly divided into four, and each of them is recorded in four separate LDs, and each of these 1/4, L, M, and N is recorded. , P are used to display a single screen (large screen) on a multi-screen, a case will be described below with reference to FIG.

LD31 in which (L1, M1, N1, P1) is recorded continuously, and (L2, M2, N2, P2)
LD32 which is recorded continuously, and (L3 ・ M3 ・
LD33 in which N3 and P3) are recorded continuously,
Four types of LDs, which are LDs 34 in which (L4, M4, N4, P4) are continuously recorded, are used.

By controlling each of the four types of LDs to start reproduction from the same frame number, the time t0 to
During t1, the image of the image signal L is displayed (multi-screen 1
5i), the video of the video signal M is displayed during the time t1 to t2 (multi-screen 15j), the video of the video signal N is displayed during the time t2 to t3 (multi-screen 15k), and from the time t3. , The image of the image signal P is displayed (multiscreen 15l).

As described above, the original image (large screen)
Is divided into four, recorded in each signal source (LD), played back, and displayed to form a multi-screen rather than a case where an original video of size 1/4 is enlarged and a large screen is obtained. The resolution of each display is increased, and it becomes possible to display clear images as a multi-screen.

FIG. 9 shows four L recording the same video signal.
It is explanatory drawing which showed the relationship between a video signal and a display state when D is used. In FIG. 9, numbers 15m to 15p are multi-screens (multi-displays). Less than,
A case will be described with reference to FIG. 9 in which video is displayed on a multi-screen by using four LDs in which video signals L and M are continuously recorded in the form of M after L.

In the four LDs in which the video signals L and M are continuously recorded, the reproduction start time from the same frame of each LD is shifted by a fixed time, thereby obtaining a strobe display as a still image. A similar display effect is possible. The control method is as follows. First, the display unit 1 controls the reproduction start of the LD (multi-display 15m), and after the time t1, the display unit 2 controls the reproduction start (multi-display 1).
5n). Similarly, the display unit 3 and the display unit 4 also receive the time t2 after the time t2 (multi display 15o).
Control playback start after 3 (multi-display 15
p).

As described above, it is possible to simultaneously display, on a multi-screen, images that have been shifted by a certain period of time in the same image. Also, it goes without saying that each of the display units can repeatedly display one image.

FIG. 10 is an explanatory diagram showing a method for switching the display screen from a still image to a moving image. Figure 10
The numbers 15q and 15r are multi-screens (multi-displays). Hereinafter, a switching method for switching the screen from a still image to a moving image in the multi-screen display system shown in FIG. 1 will be described with reference to FIGS. 1 and 10.

First, the moving image L is set to L1, L2, L3, L
A total of 4 types of LDs, each of which is divided into 4 and recorded in 4 divisions respectively, and still image data A (A1, A2, A) in which the first frame of each LD is captured as a still image.
3, A4) is prepared. Then, the still image data A (A1, A2, A3, A4) is transferred to each display unit and displayed on the round screen 15q.

Next, when each display unit controls the reproducing device to start reproducing the moving image L, a display effect that a still image starts to move is obtained. In the display method described with reference to FIG. 9, similarly to the above, if the first frame recorded in the LD is prepared as still image data and the still image data is displayed before the playback of each playback device is started. , It is possible to switch the screen from a still image to a moving image in display units. Further, it is also possible to switch from a moving image to a still image, which is the reverse pattern described above, and this makes the display clearer than the paused state of the reproducing apparatus to which the pause function is added.

In the above embodiment, the storage medium of the reproducing apparatus is
Although it has been described that the LD is an LD that records an NTSC television signal, an optical disc that records a MUSE signal, a high-definition signal or the like may be used as a storage medium.
As a playback device, a VTR (Video Tape) is used.
It goes without saying that Recorder) or the like may be used. Further, the image data is described as being recorded on the MO disk (magneto-optical disk), but not only the MO disk but also an external storage device such as a hard disk or an optical disk capable of recording a large amount of digital data such as image data can be used. Needless to say.

[0068]

According to the multi-screen display system of the present invention, the means for controlling the reproducing apparatus to which the display unit is connected, the video signal obtained from the frame memory in the display unit and the video signal obtained from the reproducing apparatus. By having means for switching and selecting any of the above, and outputting,
For each display (screen) that makes up the multi-screen,
Images from different signal sources can be displayed with smooth switching.

Therefore, as a multi-screen display system, the present invention can realize a presentation having a high display effect in which still images and moving images are interwoven.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of a four-screen multi-screen display system as a first embodiment of the present invention.

FIG. 2 is a block diagram showing details of a display unit 1 in FIG.

FIG. 3 is an explanatory diagram showing the relationship between the video signal output from each display unit and the display state of the display at that time in the embodiment shown in FIG.

FIG. 4 is a schematic diagram of a four-sided multi-display shown in FIG.
6 is a flowchart showing a flow of an operation of switching an image display state.

FIG. 5 is a block diagram showing an overall configuration of a multi-screen display system as a second embodiment of the present invention.

6 is a flowchart showing an operation flow of the second embodiment (multi-screen display system) of the present invention shown in FIG.

7 is an explanatory diagram showing control information given to each display unit when the second embodiment of the present invention shown in FIG. 5 executes the flow of the image display operation shown in FIG. is there.

FIG. 8 shows a relationship between a reproduced video signal and a display state when one screen (large screen) is divided into four small screens by ¼ and each small screen is recorded on four LDs. FIG.

FIG. 9 is an explanatory diagram showing a relationship between a video signal and a display state when four LDs recording the same video signal are used.

FIG. 10 is an explanatory diagram showing a method of switching a display screen from a still image to a moving image.

[Explanation of symbols]

1 to 4 ... Display unit, 10 ... System controller,
11-14 ... Display, 15a-15r ... Multi-display, 21-24 ... Playback device, 31-34 ... LD
(Laser disk) 41-44 ... video signal, 50 ... S
CSI bus, 61 to 64 ... RS232C bus, 70 ... Internal bus, 80 ... MO drive, 81 ... MO disk, 1
01 ... Frame memory, 102 ... D / A conversion circuit, 10
3 ... video signal switching circuit, 104 ... CRT controller,
105 ... ROM, 106 ... RAM, 107 ... CPU, 1
08 ... SCSI controller, 109 ... Playback device I /
F, 401-407 ... Processing, 601-609 ... Processing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Takeuchi, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture

Claims (5)

[Claims] 1. A plurality of display units and a plurality of displays provided in a one-to-one correspondence with each of the display units, each display being a video signal supplied from the corresponding display unit. And a system controller for collectively controlling the plurality of display units, wherein the plurality of displays collectively constitute a multi-screen as a large screen. Corresponding to each of the one-to-one relationship,
A playback device for a video signal recording medium is arranged, and each of the display units stores a frame memory for storing image data to be displayed, and a converter for converting the image data read from the frame memory into a video signal and outputting the video signal. Means and the video signal output from the converting means is a first video signal, and the video signal reproduced from the video signal recording medium reproducing device arranged corresponding to the self unit is a second video signal. At this time, a multi-screen display system including at least video signal switching means for taking in both of them, selecting one of them, and outputting to the display provided corresponding to its own unit. 2. The multi-screen display system according to claim 1, wherein the display unit has various control information including control information for controlling an operation of the video signal recording medium reproducing apparatus corresponding to the display unit. A multi-screen display system characterized by comprising storage means for receiving and storing data transferred from the controller. 3. The multi-screen display system according to claim 1, wherein the display unit outputs control information for controlling its operation to the video signal recording medium reproducing device corresponding to its own unit. On the other hand, there is provided means for transferring to the system controller a status signal indicating what state the playback device is in as a result of the playback device responding or not responding. A multi-screen display system characterized by 4. The multi-screen display system according to claim 1, wherein when each of the plurality of display units starts processing based on various control information transferred from the system controller, its start timing A multi-screen display system comprising means for transmitting timing information for notifying the information from the system controller to each of the plurality of display units. 5. The multi-screen display system according to claim 1, 2, 3 or 4, and a video signal recording medium reproducing device arranged corresponding to each of said display units in a one-to-one relationship, and the reproducing device. The display unit corresponding to the device,
A multi-screen display system characterized in that an interface bus for connecting the two comprises an RS232C bus.