JP2989382B2 - Multi-screen display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enlarges the entire display group by dividing the screen on each display of a display group in which a plurality of displays such as cathode ray tubes and liquid crystal displays are arranged in a matrix. The present invention relates to a multi-screen display device capable of displaying an image.

[0002]

2. Description of the Related Art An apparatus disclosed in Japanese Patent Publication No. 50-32009 is known as an apparatus for projecting images on a plurality of displays. In the invention of Japanese Patent Publication No. 50-32009, a screen of one video source is divided and enlarged by using a video signal enlargement device, and each enlarged image is projected on a display device. It is possible to project an enlarged image as a whole.

FIG. 3 is a block diagram showing a basic configuration example of such a conventional multi-screen display device.

In FIG. 3, reference numeral 1 denotes a video signal generator, for example, a medium such as a video tape recorder or a video disk player in which video signals are stored in advance, or a television tuner, and further directly outputs video signals. The television camera or the like is switched and connected. The video signal generated by the video signal generator 1 is supplied to the video switch 4 and the frame memory group 3a of the video enlargement device 3.

[0005] Reference numeral 2 denotes a system controller using a computer system, which controls the above-described image enlarging device 3. Input means 6 such as a keyboard is connected to the system controller 2.

The image enlargement device 3 is a device for generating an enlarged image signal at an arbitrary enlargement ratio, and includes a frame memory group 3a, enlargement control means 3b, a program memory 3c, and the like. The frame memory group 3a is provided with a number of frame memories corresponding to the number of displays constituting the display group 5 described later. As described above, the screen of the video signal generated by the video signal generator 1 is divided and given to each frame memory of the frame memory group 3a. At the time of dividing the screen for each frame memory, an enlargement ratio is determined.

The enlargement control means 3b controls the reading of the frame memory group 3a to output an image signal enlarged at an arbitrary enlargement ratio to the image switch 4. Program memory 3c
Inputs and stores the automatic operation program sent from the system controller 2 via the enlargement control means 3b.

As described above, the video switcher 4 outputs either the same-size video signal directly supplied from the video signal generator 1 or the enlarged video signal output from the frame memory group 3a of the video enlargement device 3. Select and output to the display group 5. In this example, the display group 5 includes nine display devices arranged in a 3 × 3 matrix.

The operation of such a conventional multi-screen display device is as follows. First, the case of performing automatic driving will be described.

When the automatic operation is to be performed, the automatic operation program is transmitted from the system controller 2 to the image enlarging device 3 in advance.
Is downloaded to the enlargement control means 3b and stored in the program memory 3c. Thereafter, when an execution command is output from the system controller 2, the image enlarging device 3 starts up and executes automatic operation according to the automatic operation program stored in the program memory 3c.

When the automatic operation program is executed in this manner, for example, in the case of performing an enlarged display, the enlargement control means 3b writes the video signal generated by the video signal generator 1 into the frame memory group 3a and By controlling the reading and controlling the video switch 4 so that the output from the frame memory group 3a is output to the display group 5, the video signal generated from the video signal generator 1 is preset by the automatic operation program. The image is enlarged at the set enlargement ratio and displayed on the display group 5 via the video switching unit 4.

In the case of displaying images at the same magnification, the enlargement control means 3b controls the video switch 4 so that the output from the video signal generator 1 is outputted to the display group 5 as it is. The video signal generated from the signal generator 1 is displayed on each display of the display group 5 at the same magnification.

In the case of performing a manual operation such as always displaying an image with a constant magnification without using the automatic operation program, the image is enlarged by operating the input means 6 connected to the system controller 2. When a screen state such as a magnification ratio of a video signal by the device 3 is instructed, information specifying the screen state is sent from the system controller 2 to the enlargement control means 3b, and the enlargement control means 3b is sent from the system controller 2. This is realized by writing and reading the video signal to and from the frame memory group 3a in accordance with the information specifying the screen state, and controlling the switching state of the video switch 4.

The above-mentioned screen state includes information on what video source is to be selected as the video signal generator 1, an enlargement factor and enlargement position information for controlling reading of the frame memory group 3a, and output contents. It is determined based on video switching selection information of the video switching device 4 for controlling.

[0015]

In the above-mentioned conventional multi-screen display device, when the power supply of the device is cut off, if the power supply is being operated by the automatic operation program, the power supply is restored and the program is restored. Restarts, but it is necessary to reset the screen state during manual operation.

The present invention has been made in view of such circumstances, and a multi-screen display device which does not need to reset the screen state even when the power of the device is cut off during manual operation. For the purpose of providing.

[0017]

A multi-screen table according to claim 1.
Display apparatus includes a plurality of video memory, and the image enlargement device having a larger control means for controlling writing and reading of video signals for these video memories, in the connected display multiple to each of the plurality of image memory and a configured display unit group, in the multi-screen display device to enlarge a video signal to the display unit group by writing by dividing one screen of the video signal to said plurality of image memories, by the enlargement control means storage means for storing a control state, the expansion
Detects when the control state of the large control means changes
And the control state after the change is stored in the storage means.
And means, said enlargement control means reads optionally a control state stored in the storage means, characterized in that are no to operate according to the read control state. The multi-screen display device according to claim 2, wherein the storage means
Has at least two storage areas and is used alternately
It is characterized by what it does.

[0018]

In the multi-screen display device according to the present invention, for example, when the power supply is cut off, the enlargement control means automatically resumes control when the power supply is restored in accordance with the control state stored in the storage means. .

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments.

FIG. 1 is a block diagram showing the configuration of an embodiment of a multi-screen display device according to the present invention.

In FIG. 1, reference numeral 1 denotes a video signal generator, for example, a medium such as a video tape recorder or a video disk player in which video signals are previously stored, a television tuner, and a video signal directly output. The television camera or the like is switched and connected. The video signal generated by the video signal generator 1 is supplied to the video switch 4 and the frame memory group 3a of the video enlargement device 3.

Reference numeral 2 denotes a system controller using a computer system, which controls the above-described image enlarging device 3. Input means 6 such as a keyboard is connected to the system controller 2.

The image enlargement device 3 is a device for generating an enlarged image signal at an arbitrary enlargement ratio, and includes a frame memory group 3a, enlargement control means 3b, a program memory 3c and a state storage memory 3d.
Etc. are provided. The video signals generated from the video signal generator 1 are given to the frame memory group 3a as described above, and the frame memory group 3a includes a number of frame memories corresponding to the number of the display units constituting the display group 5 described later. I have.

The enlargement control means 3b controls the readout of the frame memory group 3a to output an image signal enlarged at an arbitrary enlargement ratio to the image switch 4. Program memory 3c
Inputs and stores the automatic operation program sent from the system controller 2 via the enlargement control means 3b. The state storage memory 3d is a memory for storing the control states of the frame memory group 3a and the video switch 4 by the enlargement control means 3b, and is composed of a rewritable nonvolatile memory such as an EEPROM.

As described above, the video switcher 4 outputs either the same-size video signal directly supplied from the video signal generator 1 or the enlarged video signal output from the frame memory group 3a of the video enlargement device 3. Select and output to the display group 5. In this example, the display group 5 includes nine display devices arranged in a 3 × 3 matrix.

The operation of the multi-screen display device according to the present invention is as follows. First, the operation in the case of performing the automatic operation is the same as that of the conventional example, and thus the description is omitted.

In the case of performing a manual operation such as always displaying an image with a constant magnification without using the automatic operation program, first, the screen conditions are changed by operating the input means 6 connected to the system controller 2. input. Here, the screen condition is information on what video source is selected as the video signal generator 1, an enlargement ratio and enlargement position information for controlling reading of the frame memory group 3a, and information for controlling output contents. It is determined by the video switching selection information of the video switching unit 4 and the like.

When the information for determining the screen state is sent from the input means 6 to the frame memory group 3a, the enlargement control means 3b responds to the sent information by inputting the video signal, reading from the frame memory group 3a, and displaying the image. By controlling the video switching state by the switch 4, the display of the video signal on the display group 5 is controlled.

When a screen state storage command is input through the input means 6 in the state where the apparatus is operated manually in this manner, the system controller 2 sends a command to the enlargement control means 3b of the image enlargement apparatus 3. State storage is instructed. As a result, information for determining the screen state controlled by the enlargement control means 3b at that time is stored in the state storage memory 3d.

For example, when the screen state stored in the state storage memory 3d is called when the power supply to the apparatus is restored after the power supply to the apparatus is once cut off, the input means 6 is input to the input means 6 in the same manner as described above. When a screen state read command is input, an instruction is given from the system controller 2 to the enlargement control means 3b of the image enlargement device 3, whereby information on the screen state stored in the state storage memory 3d is read out to the state storage memory 3d. You. Then, the enlargement control unit 3b restarts displaying the video signal on the display group 5 according to the screen state information read from the state storage memory 3d.

FIG. 2 is a block diagram showing the configuration of another embodiment of the present invention. The same reference numerals as those of the embodiment shown in FIG. 1 denote the same components.

In the embodiment whose configuration is shown in FIG. 2, when new information for controlling the screen state is given from the enlargement control means 3b to the frame memory group 3a, this information is stored in the state storage memory 3d. Comparing means for comparing the stored screen state information with the enlargement control means 3b;
3e is provided. Further, two systems of the state storage memory 3d are prepared.

When new information for controlling the screen state is given to the frame memory group 3a from the enlargement control means 3b, the comparing means 3e takes in the information and stores it in one system of the state storage memory 3d at that time. Compare with the information that is provided. If the result of this comparison does not match, the comparing means 3e returns a predetermined signal to the enlargement control means 3b. When the predetermined signal is supplied from the comparison means 3e, the enlargement control means 3b stores the information on the screen state at that time in the state recording memory 3d.
In the other system. And this status record memo
When the storage of the information in the other system of the file 3d is completed, the other system becomes valid.

Thus, in the embodiment shown in FIG.
Each time the control of the screen state is changed by the enlargement control means 3b, the new screen state information is stored in the state storage memory 3d. By reading the stored information by the enlargement control means 3b, it is possible to reproduce the screen state immediately before the power is turned off.

As in the embodiment shown in FIG. 2, two systems of the state storage memory 3d are prepared, and when the writing of information to one system is completed, that system is made effective. If the information is written in the system of the above, even if the power is shut off while the information of the screen state is being written to the state storage memory 3d, it is possible to store the immediately previous screen state.

[0036]

As described in detail above, according to the multi-screen display device of the present invention, the change of the control state by the enlargement control means can be controlled.
The control state after the detection and change is stored in the recording means.
There because, even when the power supply of the apparatus is as blocked, stores
The information of the control state stored in the means, enlargement control means reads the control state after the change when the power supply is restarted
The screen status is automatically reset. Further, by storing the screen state in the storage means every time a change in it, always possible to store the latest information, storage
A situation in which the power is shut off during writing to the means and the contents stored in the state storage memory become indefinite can be avoided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a multi-screen display device according to the present invention.

FIG. 2 is a block diagram showing a configuration of another embodiment of the present invention.

FIG. 3 is a block diagram illustrating a basic configuration example of a conventional multi-screen display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 video signal generator 2 system controller 3 video enlargement device 3a frame memory group 3b enlargement control means 3d state storage memory 3e comparison means 4 video switcher 5 display group

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G09G 5/00 G06F 3/153 G09G 5/36 H04N 5/68

Claims (2)

(57) [Claims] An image enlargement device having a plurality of image memories and enlargement control means for controlling writing and reading of image signals to and from the image memories; and a plurality of display units connected to the plurality of image memories, respectively. A multi-screen display device comprising: a plurality of display units; a plurality of display units, wherein one screen of the video signal is divided and written into the plurality of video memories to display the video signal on the display group in an enlarged manner. Storage means for storing the control state by the
When the control state of the enlargement control means changes.
And the control state after the change is stored in the storage means.
Means for causing the enlargement control means to read the control state stored in the storage means as needed, and operate according to the read control state. 2. The storage device according to claim 1, wherein said storage means includes at least two storage areas.
2. The multi-screen display device according to claim 1, wherein the multi-screen display device has an area and is used alternately .