JP3199540B2 - Video display device, screen display system and multi-screen display system using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device for capturing and displaying a video signal, and in particular, by inserting a circuit board for enlarging / reducing a video signal, a plurality of different screens can be displayed on the same screen. The present invention relates to a video display device that can perform the same size, enlargement / reduction, and composite display by switching to.

[0002]

2. Description of the Related Art A multi-screen display system, as described in, for example, Japanese Patent Application Laid-Open No. 50-32009, arranges a plurality of video display devices each composed of a cathode ray tube, and outputs a video signal of one screen to each video display device. Is a display system for distributing and displaying on one large screen. Conventionally, a video display device used in such a multi-screen display system displays a video signal at an equal magnification (that is, as it is without being enlarged), as represented by a general television device or a computer display device. It was a video display device. Accordingly, for example, as described in Japanese Patent Application Laid-Open No. 4-280291, when an enlarged display is performed in a multi-screen display system, after distributing a video signal of one screen, the video display device is arranged outside the video display device. With the screen processing units housed in separate housings, enlargement processing is performed respectively, and then, the multi-screen is displayed on each display screen unit corresponding to a general television device or a display device of a computer. Had formed.

[0003]

In such a conventional multi-screen display system, the number of enlarged screens on which the screen processing unit can perform enlargement processing is predetermined, so that the number of enlarged screens is larger than the number of enlarged screens. If it is desired to perform enlarged display, it is necessary to increase the number of screen processing units accordingly. However, as described above, since the screen processing unit is disposed outside the video display device and is housed in a separate housing from the video display device, increasing the screen processing unit means storing the housing. There is a problem that the scale of the entire system is increased due to the increase in the number of housings.

On the other hand, a video display device dedicated to a multi-screen display system and having a signal processing circuit for performing an enlargement process has been developed. If such a video display device is used, there is no concern that the number of housings different from the video display device increases even if the number of enlarged surfaces increases. However, such a video display device can be used for the above-described multi-screen display system which is currently mainstream (that is, a multi-screen display system in which an enlargement process is performed by a screen processing unit arranged outside the video display device). Therefore, problems such as poor versatility as a display arise.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to perform switching display such as equalizing, enlarging / reducing, and combining a plurality of videos on the same screen.
When a multi-screen display system is configured, even if the number of enlarged screens increases, there is no need to increase the number of housings (housings of the screen processing unit that performs the enlargement processing) separate from the video display device. Can be applied to a conventional multi-screen display system in which a screen processing unit that performs
An object of the present invention is to provide a video display device that can be used as a general-purpose display.

[0006]

[Means for Solving the Problems] Achieve the above objectives
Therefore, in the present invention,The above base is attached to the main body having the board insertion port.
Video display device with an enlarged circuit board inserted through the board insertion opening
Wherein the magnifying circuit board includes a first video signal (video
An input terminal for inputting B) from the outside into the board;
To input a large control signal (enlarged X) into the board from outside
And the first video signal input into the substrate
And performs an enlargement process based on the enlargement control signal and outputs
Signal processing means, and a signal output from the signal processing means.
An output terminal for outputting the first video signal to the main body;
And the main body includes a second video signal (video
An input terminal for inputting the image A) from outside into the main body;
A first synchronization signal (synchronization signal) corresponding to the first video signal;
B) an input terminal for inputting externally
A second synchronization signal (synchronization A) corresponding to the second video signal
Input terminal for inputting
Inputting the first and second synchronization signals input to
Synchronous switching means for selecting and outputting one of the synchronous signals
And the first and second video signals input into the main body
Or output one video signal as it is
Combining means for combining and outputting both video signals,
According to the synchronization signal output from the synchronization switching means,
Performs video processing on the video signal output from the combining
Image processing means for outputting the image data, and output from the image processing means.
A display for displaying an image based on the image signal;
It was prepared.

[0007]

According to the present invention, in the above configuration, an enlarged circuit board is inserted as a circuit board into an image display device, and an enlargement process is performed in the enlarged circuit board, so that a plurality of images are magnified on the same screen. Switching display such as enlargement / reduction, synthesis, etc. can be performed. In addition, by configuring a multi-screen display system using a plurality of video display devices into which such an enlarged circuit board is inserted, even if the number of enlarged screens increases, a housing (an enlarged There is no need to increase the number of screen processing units that perform processing.

Further, in the above configuration, a dummy circuit board for directly outputting an input signal is inserted as a circuit board into the video display device, so that a plurality of video images can be multiplied and synthesized on the same screen. Can be switched. Further, by inserting the dummy circuit board into the video display device, it is possible to apply the video display device to a conventional multi-screen display system in which a screen processing unit for performing an enlargement process is disposed outside. In addition, it can be used as a general-purpose display.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an input terminal portion of an image display device as a first embodiment of the present invention and a circuit board to be inserted.

In this embodiment, two video signals A and B having different frequencies can be switched and synthesized. That is, the video display device 1 displays or switches the video A and the video B to form one video signal N by switching or synthesizing the video A and the video B, and displays the switched video signal N as one video signal. 1 (a), an input terminal 10A of a video signal for the video A, and a display (not shown).
B, input terminals 40A and 40B of a synchronizing signal corresponding to B, an insertion slot 600 for an enlarged circuit board for signal processing for enlarging and reducing the image B, and a display control terminal 30 for performing display control
And W in the housing.

As shown in FIG. 1B, an insertion circuit board for enlarging the image B, that is, an enlargement circuit board 31 is, for example, an A / D conversion circuit, a memory circuit, a D / A
A signal processing circuit 20 for enlargement processing including a conversion circuit, a write / read control circuit, and the like is mounted, and connection with an input terminal 10B of an image signal for image B, an enlargement control terminal 30X, and the image display device 1 is provided. And an input / output terminal 39 having at least an output terminal 39-1 of a video signal for the video B.

Further, as shown in FIG. 1C, an insertion circuit board for outputting the image B as it is to the image display apparatus 1 without performing signal processing, that is, a dummy circuit board 31 'is used for the signal processing circuit 20. Although it does not have the enlargement control terminal 30X, it has an input / output terminal 39 having at least an input terminal 10B for video B and an output terminal 39-1 for video B.
Then, the image B input from the input terminal 10B is directly output from the output terminal 39-1 via the connection line 20 'as it is.

In the state where the above-described enlarged circuit board 31 is inserted into the video display device 1, the display of the video A and the video B are controlled by controlling the screen synthesizing circuit of the video display device 1.
And the composite display of the video A and the video B can be switched. Further, the enlargement processing signal processing circuit 20 mounted on the enlargement circuit board 31 is connected to an enlargement control terminal 30X.
, A multi-screen display system using the video display device 1 with the enlarged circuit board 31 inserted therein can be configured, and a screen processing unit that performs an enlargement process even when the number of enlarged surfaces is increased is housed. There is an effect that there is no need to increase the number of housings to be used.

On the other hand, by removing the enlarged circuit board 31 and inserting the dummy circuit board 31 ′ for directly connecting the image B into the image display device 1, by controlling the screen synthesizing circuit of the image display device 1, Display of A, video B
Can be switched and displayed. Such a dummy circuit board 3
The video display device 1 in which 1 ′ is inserted can be used not only for a conventional multi-screen display system in which a screen processing unit for performing an enlargement process is arranged outside, but also as a general-purpose display.

FIG. 2 is a block diagram showing a video display device in which the enlarged circuit board shown in FIG. 1 is inserted. This video display device enlarges a specific one of two analog input video signals, Analog synthesis is performed and displayed on an analog display.

As shown in FIG. 2, the main body of the video display device 1 includes an input terminal 10A for a video A, an input terminal 30W for a display control signal, an input terminal A for a synchronization signal (= synchronization A) for the video A,
A display control circuit 4 for controlling switching between two screens based on a control signal (control W) to the input terminal 40B of the synchronization signal (= synchronization B) of the video B to the input terminal 30W, and a synchronization switching circuit of synchronization B and synchronization A 6. Connection terminals 10B-1 for taking in the image B processed by the signal processing circuit board 31, connection terminals 40B-1 and 40B-2 for supplying the synchronization signal B to the circuit circuit board 31 It is composed of a screen synthesizing circuit 5 for switching and synthesizing, a video processing circuit 7 for processing the synthesized video signal, and an analog display 8 for displaying the video processed video signal. An analog input / analog output enlargement circuit board 31 for enlarging an analog image B based on a signal (magnification X) and outputting the analog image is analogously inserted.

The enlargement circuit board 31 includes an input terminal 10B for image B, an input terminal 30X for an enlargement control signal, and an A / D conversion circuit 2 for converting an analog signal into a digital signal.
1. A memory circuit 22 for storing a digitally converted video signal, a D / A conversion circuit 23 for converting a digital signal from the memory circuit 22 into an analog signal, and an A / D conversion circuit 2.
1. A write control circuit 24 for writing a digital signal from 1 to the memory circuit 22, a read control circuit 26 for reading a digital signal from the memory circuit 22 to the D / A conversion circuit 23, a write control circuit 21, and a read control. An enlargement control circuit 25 for controlling the circuit 26; an output terminal 39-1 for outputting the signal-processed video B to the video display device 1; terminals 39-2 and 39 for inputting synchronization signals for write control and read control, respectively. -3.

The enlarged circuit board 31 and the image display device 1
The input / output connection terminals are limited to minimum signals necessary for signal processing such as a synchronization signal and a video signal, and a power supply and the like are omitted. Also, video signals A and B
Are collectively shown by one system of input / output terminals even in the case of, for example, three RGB signals. Similarly, the synchronization signal or the control signal is originally composed of a plurality of signals, but is handled collectively by one system.

The operation of the video display device 1 shown in FIG. 2 is as follows. Video A input from input terminal 10A
Is input to the screen composition circuit 5 as one signal to be composed. On the other hand, the image B input from the input terminal 10B is
In the enlargement circuit board 31, a predetermined portion of the image B is enlarged, synchronized based on the output of the synchronization switching circuit 6, and input to the screen composition circuit 5 as the other signal to be composed. The video signal synthesized on the screen is displayed on an analog display 8 after being subjected to video processing such as amplitude adjustment and contour correction in a video processing circuit 7.

In the above operation, the image display device 1
4 depending on the state of the screen synthesizing circuit 5 and the synchronization switching circuit 6
Two display modes are possible. (1) A case where only the video A input to the input terminal 10A is displayed through. (2) Enlarge only the image B input to the input terminal 10B,
When displaying in synchronization with synchronization B. (3) Enlarge only the image B input to the input terminal 10B,
When displaying in synchronization with synchronization A. (4) A case where the video A and the video B respectively input to the input terminal 10A and the input terminal 10B are combined and displayed in synchronization with the synchronization A.

Each mode can be realized as follows. (1) When only the video A input to the input terminal 10A is displayed through, the synchronization switching circuit 6 passes the synchronization A and the screen composition circuit 5 passes only the video A. That is,
The screen synthesizing circuit 5 outputs only the image A, the image processing circuit 7 performs image processing synchronized with the synchronization A on the image A, and the analog display 8 displays only the image A.

(2) When only the image B input to the input terminal 10B is enlarged and displayed in synchronization with the synchronization B, the synchronization switching circuit 6 allows the synchronization B to pass, and the screen synthesizing circuit 5 uses the enlargement circuit board 31 Only the processed image B (hereinafter, enlarged image B) is passed. That is, only the image B is output by the screen synthesizing circuit 5, and the image processing circuit 7 performs image processing synchronized with the synchronization B on the enlarged image B and displays only the enlarged image B on the analog display 8.

Here, the enlargement circuit board 32 performs enlargement processing on the image B by the following processing, and outputs the output signal of the synchronization switching circuit 6, ie, the enlarged image B in synchronization with the synchronization B in the mode (2). Output.

The enlargement control circuit 25 controls the write control circuit 21 and the read control circuit 26 based on the enlargement X (= enlargement control signal X) input to the input terminal 30X. B (= synchronizing signal of video B)
The timing control of the / D conversion circuit 21 and the memory circuit 22 is performed. The A / D conversion circuit 21 converts the video B (= video signal B) input to the input terminal 10B into a digital signal in synchronization with the synchronization B (= video B synchronization signal) input to the input terminal 40B. The memory circuit 22 temporarily stores a portion to be enlarged by the A / D converted digital signal. Next, the read control circuit 26 controls the timing of the memory circuit 22 and the D / A conversion circuit 23 in synchronization with the synchronization B of the synchronization switching circuit 6 because only the enlargement processing of the video B is performed. The memory circuit 22 magnifies and reads out the stored digital signal in synchronization with the synchronization A or synchronization B switching output of the switching circuit 6. The D / A conversion circuit 23 converts the read digital signal into an analog signal, and outputs an analog video signal having a frequency synchronized with the synchronization B.

(3) When only the image B input to the input terminal 10B is enlarged and displayed in synchronization with the synchronization A, the synchronization switching circuit 6 allows the synchronization A to pass, and the screen synthesizing circuit 5 uses the enlargement circuit board 32 Only the processed image B (hereinafter, enlarged image B) is passed. That is, only the image B is output by the screen synthesizing circuit 5, and the image processing circuit 7 performs image processing synchronized with the synchronization A on the enlarged image B and displays only the enlarged image B on the analog display 8.

Here, the enlargement circuit board 32 performs an enlargement process on the image B, and outputs an output signal of the synchronization switching circuit 6, that is, an enlarged image B in synchronization with the synchronization A in the mode (3).

(4) Input terminal 10A and input terminal 10
When the video A and the video B input to B are combined and displayed, the synchronization switching circuit 6 passes the synchronization A,
The screen synthesizing circuit 5 outputs the video A and the video B (hereinafter, referred to as the video B) processed by the enlargement circuit board 31 so as to have the same frequency as the video A.
The enlarged video B) is appropriately switched and output. That is, a composite screen of the video A and the enlarged video B of the same frequency is output from the screen compositing circuit 5, and the video processing circuit 7 performs video processing synchronized with the synchronization A on the composite screen and displays it on the analog display 8. I do.

The enlarged circuit board 31 in the mode (4)
Performs the enlarging process on the image B by the following process, and outputs the output signal of the synchronization switching circuit 6, that is, the enlarged image B in synchronization with the synchronization A in the mode (4).

The enlargement control circuit 25 controls the write control circuit 21 and the read control circuit 26 on the basis of the enlargement X input to the input terminal 30X. The timing control of the D conversion circuit 21 and the memory circuit 22 is performed. The A / D conversion circuit 21 has an input terminal 40
The video B input to the input terminal 10B is converted into a digital signal in synchronization with the synchronization B input to B. Memory circuit 2
Reference numeral 2 temporarily stores a portion to be enlarged in the A / D converted digital signal. Next, the read control circuit 26
And the video A, the switching circuit 6
Memory circuit 22 and D / A
The timing of the conversion circuit 23 is controlled. That is, the memory circuit 22 enlarges and reads out the stored digital signal in synchronization with the switching output of the synchronization A of the switching circuit 6. The D / A conversion circuit 23 converts the read digital signal into an analog signal, and outputs an analog video signal based on the frequency of the synchronization A.

Therefore, according to the video display device shown in FIG. 2, the video A and the video B having different frequencies are input and the through-display of the video A, the enlarged display of the video B or the video A and the video B are performed by external control. Can be displayed on a composite screen.

In the above description of the display modes (1) to (4), the display frequency of the video processing circuit 7 or the analog display 8 is not particularly mentioned.
The description is based on the assumption that the display is a so-called multi-scan type display that can display at a frequency of. The following embodiments of the present invention will be described based on the same assumption.

However, other assumptions, for example, even if the analog display 8 is a single scan type display corresponding to only the frequency of the image A, the image A
Needless to say, it is possible to combine the screen with the image B. However, if the analog display 8 displays the image A (ie,
In the case of a single scan corresponding to the synchronization A),
For example, “Synchronization B” referred to in the display mode (2) described above
Cannot be displayed in synchronization with the display mode ".

The video display device shown in FIG. 2 does not refer to the DC component of the analog video A at the time of screen synthesis, but if the DC component of the video A is not determined in advance, It goes without saying that the clamp circuit is provided immediately before the screen synthesizing circuit 5.

FIG. 3 is a block diagram showing a video display device in which the dummy circuit board shown in FIG. 1 is inserted. This video display device switches two analog input video signals and displays them on an analog display. .

The dummy substrate circuit 31 'shown in FIG. 3 is one of the simplest examples, and has a configuration in which the input terminal 10B of the image B and the image output terminal 39-1 are connected by a connection line 20'. The configuration of the main body of the video display device 1 is the same as that of FIG.

The operation of the video display device 1 shown in FIG. 3 is as follows. Video A input from input terminal 10A
Is input to the screen composition circuit 5 as one signal to be composed. On the other hand, the image B input from the input terminal 10B is
In the dummy circuit board 31 ', the screen synthesizing circuit 5 is used as the other signal to be passed through and synthesized without any processing.
Is input to The video signal synthesized on the screen is displayed on an analog display 8 after being subjected to video processing such as amplitude adjustment and contour correction in a video processing circuit 7.

In the above operation, the image display device 1
3 depending on the state of the screen synthesizing circuit 5 and the synchronization switching circuit 6
Two display modes are possible. (1) A case where only the video A input to the input terminal 10A is displayed through. (2) A case where only the image B input to the input terminal 10B is displayed as a through image. (3) A case where the images A and B input to the input terminals 10A and 10B are combined and displayed. However, it is limited to the case where the synchronization of the video A and the video B is the same.

Each mode can be realized as follows. (1) When only the video A input to the input terminal 10A is displayed through, the synchronization switching circuit 6 passes the synchronization A and the screen composition circuit 5 passes only the video A. That is,
The screen synthesizing circuit 5 outputs only the image A, the image processing circuit 7 performs image processing synchronized with the synchronization A on the image A, and the analog display 8 displays only the image A.

(2) When only the video B input to the input terminal 10B is to be displayed through, the synchronization switching circuit 6 passes the synchronization B, and the screen synthesizing circuit 5 passes only the video B. That is, only the image B is output in the screen composition circuit 5,
The video processing circuit 7 performs video processing synchronized with the synchronization B
And the analog display 8 displays only the image B.

(3) Input terminal 10A and input terminal 10
When the video A and the video B input to B are combined and displayed, the synchronization switching circuit 6 passes the synchronization A,
The screen synthesizing circuit 5 appropriately switches and outputs the video A and the video B having the same frequency as the video A. That is, the screen synthesis circuit 5
From the video A and the enlarged video B of the same frequency are output from the multiplexed video. The video processing circuit 7 performs video processing synchronized with the synchronization A on the synthesized screen and displays the processed video on the analog display 8.

According to the video display apparatus shown in FIG. 3, the video display apparatus does not have the enlargement function, but receives the video A and the video B having different frequencies as input and externally controls the through display of the video A and the video B. Can be displayed, and when the frequencies of the video A and the video B match, the composite display of the video A and the video B can be performed. That is, the video display device 1 shown in FIG. 3 can be used as a switcher built-in display capable of switching display between two inputs.
By inputting a through video signal as the video A and inputting a video signal enlarged by a screen processing unit disposed outside as the video B, the video display device 1 in FIG. It can also be used as a display for a conventional multi-screen display system in which a processing unit is arranged outside.

The above is the description of the first embodiment of the present invention. Note that the terminal arrangement of the video display device is not unique, and various arrangements are conceivable. Therefore,
As an embodiment in which the terminal arrangement is changed, an embodiment in which the arrangement of the input terminal 40B of the synchronizing signal of the video B is changed using FIGS. 4 to 7 and an embodiment in which the arrangement of the display control terminal 30W is changed is shown in FIG. An embodiment in which external synchronization is further provided will be described with reference to FIG.

FIG. 4 is a block diagram showing a video display device according to a second embodiment of the present invention in which an enlarged circuit board is inserted. In this video display device, a synchronous B input terminal 10B is used.
Are arranged on the enlarged circuit board 31.

The input terminal 10B of the synchronous B is connected to the enlarged circuit board 3.
4 except that the input synchronization B is connected to the synchronization switching circuit 6 from the terminal 39-2 of the enlarged circuit board 31 via the terminal 40B-1 of the video display device 1 in FIG. The configuration is exactly the same as that of FIG. Therefore, the operation and effect of the video display device of FIG. 4 are exactly the same as those of FIG.

In the configuration of the video display device 1 shown in FIG. 4, if the input terminal of the synchronization B is arranged on the dummy circuit board 31 'shown in FIG. 3, the video display device has exactly the same operation and effect as FIG. That is clear.

FIG. 5 is a block diagram showing a video display device according to a third embodiment of the present invention in which an enlarged circuit board is inserted. In this video display device, a synchronous B input terminal 10B is used.
Are arranged on the enlarged circuit board 31, and the synchronization switching circuit 6 is arranged on the enlarged circuit board 31.

The configuration of the enlarged circuit board 31 shown in FIG. 5 differs from that of FIG. 4 only in the position of the synchronization switching circuit 6. However, the more specific description is as follows. (1) The input terminal 10B of the synchronization B and the changeover switch 6 are arranged on the enlarged circuit board 31, (2) the synchronization A from the video display device 1 is input from the terminal 39-3, and (3) the synchronization B and the synchronization A. Is input to the changeover switch 6, and (4) the image display device 1
From the terminal 39-5, (5) switch the changeover switch 6 with the input control W, (6) apply the changeover output of the changeover switch 6 to the readout circuit 26, and (7) simultaneously change the changeover switch 6 is output to the terminal 39-4.

Therefore, the operation of the video display device 1 shown in FIG. 5 is different from that of FIG. 4 in the following point. (1) The synchronization A input to the terminal 41A is output to the terminal 40B. (2) The synchronization signal from the enlarged circuit board 31 is input from the terminal 40B-2. (3) On the other hand, the display control circuit 4 is controlled by the control W input to the terminal 30W, and at the same time, it is output to the output terminal 30W-1.

The configuration of the video display device shown in FIG. 5 is different from that of FIG.
Therefore, the operation of the video display device 1 is the same as that of FIG. 4, and the effect of the video display device shown in FIG. 5 is exactly the same as that of FIG.

However, in the configuration of the video display device shown in FIG. 5, the enlarged circuit board 31 or the dummy circuit board 31 '
Is not inserted into the video display device 1, not only the synchronization B but also the synchronization A cannot be taken in, so that the video A cannot be displayed only by the main body of the video display device 1.

FIG. 6 is a block diagram showing a video display device with an enlarged circuit board inserted therein according to a fourth embodiment of the present invention. Display is enabled.

The configuration of the video display device 1 shown in FIG.
The difference from FIG. 5 is slightly different from that in FIG. (1) The video display device 1 is newly provided with a synchronization switching circuit 6 ′, and (2) the synchronization switching circuit 6 ′ is provided with the synchronization A and the terminal 40.
The synchronization signal of B-2 is input, (3) the switching of the synchronization switching circuit 6 'is controlled by the control W, and (4) the switching output of the synchronization switching circuit 6' is input to the display control circuit 4.

In the configuration of the video display device shown in FIG. 6, the control of the synchronization switching circuit 6 'is increased as compared with FIG. 5, but the operation for switching the display mode and the like is the same as that of the video display device shown in FIG. Is the same. Therefore, the effect of the video display device shown in FIG. 6 is the same as that of FIG.

However, in the configuration of the video display device shown in FIG. 6, even if the enlarged circuit board 31 is not inserted, the synchronous A
Can be taken into the main body of the video display device 1,
Therefore, it is apparent that the image A can be displayed only by the main body of the image display device 1.

FIG. 7 is a block diagram showing a video display device according to a fifth embodiment of the present invention in which an enlarged circuit board is inserted. In this video display device, the synchronization switching circuit 6 is omitted.

The video display device 1 shown in FIG. 7 is different from FIG. 4 in that the read control circuit 26 operates based on the synchronization A, and the following display modes are possible. (1) A case where only the video A input to the input terminal 10A is displayed through. (2) Enlarge only the image B input to the input terminal 10B,
When displaying in synchronization with synchronization A. (3) A case where the video A and the video B input to the input terminal 10A and the input terminal 10B are combined and displayed in synchronization with the synchronization A. The operation for realizing these is obvious from the description of FIG.

In the configuration of the video display device 1 shown in FIG. 7, the synchronization B is only used for the write control circuit 24 of the enlarged circuit board 31. Therefore, when a dummy circuit board is inserted into the video display device 1 instead of the enlarged circuit board 31 shown in FIG. 7, it is meaningless to arrange the synchronization B on the dummy circuit board. May be exactly the same as the dummy circuit board 31 'shown in FIG.

When the video display device 1 shown in FIG. 7 inserts the dummy circuit board 31 'shown in FIG. 3, the following three display modes are available only when the frequencies of the video A and the video B match. It is possible. (1) A case where only the video A input to the input terminal 10A is displayed through. (2) A case where only the image B input to the input terminal 10B is displayed as a through image. (3) A case where the images A and B input to the input terminals 10A and 10B are combined and displayed. However, it is limited to the case where the synchronization of the video A and the video B is the same.

FIG. 8 is a block diagram showing a video display device according to a sixth embodiment of the present invention in which an enlarged circuit board is inserted. In this video display device, a control terminal 30W is arranged on an enlarged circuit board 31. ing.

That is, in the configuration of the video display device 1 shown in FIG. 8, the control terminal 30W is arranged on the enlarged circuit board 31, and the control W is transmitted to the video display device 1 via the terminals 39-5 and 30W-1. The point of input is different from FIG. 6, and the other configuration is completely the same as FIG. Therefore, the operation and effect of the video display device 1 shown in FIG. 8 are the same as those in FIG.

FIG. 9 is a block diagram showing a video display device according to a seventh embodiment of the present invention in which an enlarged circuit board is inserted. This video display device is different from the video display device shown in FIG. Input terminal 40G of external synchronization G in addition to B
Is added to the enlarged circuit board 31.

That is, in the configuration of the video display device 1 shown in FIG. 9, the input terminal 40G of the external synchronization G is connected to the enlarged circuit board 31.
6 is different from that of FIG. 6 in that synchronization A, synchronization B, and synchronization G are input to a three-input synchronization switching circuit 6 and are switched and output.

As described above, in the video display device 1 shown in FIG. 9, the function of the read control circuit 26 operating by the external synchronization G is increased, so that in addition to the same operations and effects as in FIG. The enlarged / reduced display of the displayed image B becomes possible.

As described above, in the embodiment in which the terminal arrangement is changed,
This has been described with reference to FIGS. By the way, in each of the above-mentioned embodiments, all of the video A and the video B are analog video signals in the main body of the video display device 1 irrespective of the inside of the enlarged circuit board 31. Next, an embodiment in which either the video A or the video B is a digital video signal in the main body of the video display device 1 will be described with reference to FIG.
This will be described with reference to FIG. The terminal arrangement is the same as that of the video display device shown in FIG.

FIG. 10 is a block diagram showing an image display device according to an eighth embodiment of the present invention in which an enlarged circuit board is inserted. This image display device digitally synthesizes two analog input image signals. This is displayed on an analog display.

The configuration of the video display device 1 shown in FIG. 10 is different from that of FIG. 2 in that an A / D conversion circuit 20 is added and the positions of the screen synthesis circuit 5 and the D / A conversion circuit 23 in FIG. 2 are changed. This is different from FIG. 2 in that the other configurations are the same as those in FIG. That is, in the video display device shown in FIG. 10, (1) an A / D conversion circuit 20 for converting the video A into a digital signal in synchronization with the synchronization A is added. (2) A digital signal (hereinafter, digital video B) of the video A (hereinafter, digital video A) converted into a digital signal by the screen synthesizing circuit 5 and the video B from the memory circuit 22
Are synthesized. (3) The enlarged circuit board 32 for analog input / digital output shown in FIG.
This is a configuration in which the / A conversion circuit 23 is removed, and the D / A conversion circuit 23 is arranged at the subsequent stage of the screen synthesis circuit 5.

In the video display device shown in FIG. 10, a video A is input to an input terminal 10A, the video A input by the A / D conversion circuit 20 is converted into a digital signal, and then the digital video A to be synthesized is screen composited. The video A is input to the circuit 5. The video B is input to the input terminal 10B, and after digital conversion by the A / D conversion circuit 21, a predetermined portion is stored in the memory circuit 22 and read out from the memory circuit 22 in synchronization with the switching output of the synchronization switching circuit 6. The digital image B to be synthesized is input to the screen synthesizing circuit 5. The screen synthesizing circuit 5 synthesizes the digital image A and the digital image B, and reproduces the analog signal by the D / A conversion circuit 23. The image processing circuit 7 performs image processing such as amplitude adjustment and contour correction on the synthesized image signal. And displays the result on the analog display 8.

The operation of the video display device 1 shown in FIG. 10 is exactly the same as that of FIG. 2 except that the image synthesis circuit 5 performs digital synthesis. Therefore, also in the video display device 1 shown in FIG.
Is also the same as FIG. 2 in that three display modes are possible depending on the state.

Therefore, according to the video display device 1 shown in FIG. 10, the digital video A and the digital video B having different frequencies are input and the video A is displayed through, the video B is enlarged, or the video A and the video B are combined. Screen display can be performed.

Further, the dummy circuit board 31 'shown in FIG.
By correcting the input of the image B of the image B so that the image B corresponds to the analog input and the digital output, it is possible to insert the dummy circuit board 31 ′ into the image display device 1 shown in FIG. The effect is exactly the same as in FIG.

In the image display device shown in FIG. 10, the enlargement processing in the enlargement circuit board 32 is not apparent at first glance, but the readout frequency of the memory circuit 22 is controlled by the D / A conversion circuit 23. The image B can be enlarged, and the function of the enlarged circuit board 31 in FIG.
The same can be realized with the enlarged circuit board 32 in.

FIG. 11 is a block diagram showing a video display device with an enlarged circuit board inserted therein according to a ninth embodiment of the present invention. This video display device performs analog synthesis on two digital input video signals. This is displayed on an analog display.

The configuration of the video display device 1 shown in FIG. 11 differs from that of FIG. 2 in that a D / A conversion circuit 19 is added to FIG. 2 and that the D / A conversion circuit 23 in FIG. The other configuration is different from that of FIG. That is, in the video display device shown in FIG. 11, (1) Since the video A is digital, the D / A converts the digital video A into an analog signal in synchronization with the synchronization A.
A conversion circuit 19 is added. (2) Furthermore, since the image B is also digital, FIG.
Digital input / analog output expansion circuit board 3 shown in
3 is a configuration in which the A / D conversion circuit 21 is removed from the enlarged circuit board 31 in FIG.

In the video display device shown in FIG. 11, a digital video A is input to the input terminal 10A, and the video A input by the D / A conversion circuit 19 is converted into an analog signal (hereinafter, analog video A). The video A is input to the screen composition circuit 5 as one signal to be composed. Digital video B is input to the input terminal 10B, and the video
Is stored in the D / A conversion circuit 23 while being read out in synchronization with the switching output of the synchronization switching circuit 6, and is converted into an analog signal (hereinafter, analog video B) by the D / A conversion circuit 23. Input to the circuit 5. The screen synthesis circuit 5 synthesizes the analog video A and the analog video B,
The video processing circuit 7 performs video processing such as amplitude adjustment and contour correction on the video signal synthesized on the screen, and displays the video signal on the analog display 8.

The operation of the image display device 1 shown in FIG. 11 is exactly the same as that of FIG. 2 except that digital images A and B are input to the input terminals 10A and 10B. Therefore, the video display device 1 shown in FIG. 11 is also the same as FIG. 2 in that four display modes are possible depending on the states of the screen composition circuit 5 and the synchronization switching circuit 6.

Therefore, according to the video display device shown in FIG. 11, the video A and the video B having different frequencies are input and the through display of the video A, the enlarged display of the video B, or the composite screen display of the video A and the video B are performed. You can do it.

The dummy circuit board 31 'shown in FIG.
By correcting the input of the image B, and making the image B correspond to the analog input and the digital output, it is possible to insert the dummy circuit board 31 'into the image display device 1 shown in FIG. The effect is exactly the same as in FIG.

In the image display device shown in FIG. 11, the enlargement processing in the enlargement circuit board 33 is not apparent at first glance, but as in the enlargement circuit board 32 in FIG.
The image B can be enlarged by controlling the read frequency of the memory circuit 22 with respect to the conversion circuit 23, and the function of the enlarged circuit board 31 in FIG. 2 can also be realized in the enlarged circuit board 33 in FIG. It is.

FIG. 12 is a block diagram showing a video display device according to a tenth embodiment of the present invention in which an enlarged circuit board is inserted. This video display device digitally synthesizes two digital input video signals. This is displayed on an analog display.

The configuration of the video display device 1 shown in FIG. 12 differs from that of FIG. 10 in that the A / D conversion circuit 20 and the A / D conversion circuit 21 are deleted from FIG. This is the same as FIG. That is, in the video display device shown in FIG. 11, (1) the video A is digital,
In this configuration, the D conversion circuit 20 is removed, and the data is directly input to the screen synthesis circuit 5 to perform digital synthesis. (2) Further, since the image B is digital, the digital input / digital output enlargement circuit board 34 shown in FIG. 12 removes the A / D conversion circuit 21 in FIG. 10 and stores the image B in the memory circuit 22 as it is. Configuration.

In the video display device shown in FIG. 12, a digital video A is input to the input terminal 10A, and the video A is input to the screen synthesizing circuit 5 as a digital video A to be synthesized. Digital video B is input to the input terminal 10B,
A predetermined portion of the image B is stored in the memory circuit 22, read out in synchronization with the output of the synchronization switching circuit 6, and input to the screen synthesizing circuit 5 as the other digital image B to be synthesized. The screen synthesizing circuit 5 synthesizes the digital image A and the digital image B, and reproduces the analog image by the D / A conversion circuit 23. The image processing circuit 7 adjusts the image synthesized by the screen, such as amplitude adjustment and contour correction. The image is processed and displayed on the analog display 8.

The operation of the video display device shown in FIG. 12 is exactly the same as that of FIG. 10 except that digital video A and video B are input to input terminals 10A and 10B. Therefore, also in the video display device 1 shown in FIG.
4 depending on the state of the screen synthesizing circuit 5 and the synchronization switching circuit 6
This is the same as FIG. 10 in that two display modes are possible.

Therefore, according to the video display device shown in FIG. 12, the video A and the video B having different frequencies are input and the through display of the video A, the enlarged display of the video B, or the composite screen display of the video A and the video B are performed. You can do it.

The dummy circuit board 31 'shown in FIG.
By correcting the input of the image B of the image B so that the image B corresponds to the analog input and the digital output, the dummy circuit board 31 ′ can be inserted into the image display device 1 shown in FIG. The effect is exactly the same as in FIG.

The enlarged circuit board 34 shown in FIG.
Although the enlargement processing function is not clear, by controlling the read frequency of the memory circuit 22 for the D / A conversion circuit 23 as in the enlargement circuit board 32 in FIG.
The image B can be enlarged, and an enlargement processing function can be realized.

In the video display devices shown in FIGS. 2 and 10 to 12, both input video signals are analog signals or digital signals, and these are displayed by analog synthesis or digital synthesis. (1) A case where analog video A and digital video B are input and synthesized and displayed. (2) A case where analog video A and digital video B are input and digitally synthesized and displayed. (3) A case where the digital video A and the analog video B are input, and are synthesized and displayed. (4) A case where digital video A and analog video B are input and digitally synthesized and displayed. Can be considered.

The configuration in each case is clear from the configuration of the video display device shown in FIGS. (1) When the analog video A and the digital video B are input and synthesized and displayed, the analog input / analog output shown in FIG. 2 is based on the configuration of the video display device shown in FIG. FIG. 1 shows an enlarged circuit board 31 of FIG.
1 is replaced with an enlarged circuit board 33 of digital input / analog output. (2) When analog video A and digital video B are input and digitally synthesized and displayed,
10 is based on the configuration of the video display device shown in FIG.
2 is replaced with a digital input / digital output enlargement circuit board 34 in FIG. (3) When the digital video A and the analog video B are input and they are synthesized and displayed in an analog manner, FIG.
11 is based on the configuration of the video display device shown in FIG.
Is replaced with the analog input / analog output enlargement circuit board 31 in FIG. (4) When digital video A and analog video B are input and digitally synthesized and displayed,
The digital input / digital output enlargement circuit board 34 in FIG. 12 is replaced with the analog input / digital output enlargement circuit board 32 in FIG. 10 based on the configuration of the video display device shown in FIG.

In the video display device described above, the video is finally displayed on the analog display. Therefore, an embodiment for displaying an image on a digital display will be described next.

FIG. 13 is a block diagram showing an image display device with an enlarged circuit board inserted therein according to an eleventh embodiment of the present invention. This image display device digitally synthesizes two digital input image signals. It is displayed on a digital display.

The configuration of the video display device 1 shown in FIG. 13 differs from that of FIG. 12 in that the D / A conversion circuit 23 in FIG. 12 is deleted and the analog display 8 is replaced with a digital display 9. Is similar to that of FIG. That is, in the video display device shown in FIG. 13, (1) the digital display 9 is composed of a digital panel, and the video processing circuit 7 processes the digital signal and displays it on the digital display 9. (2) That is, the digital video A and the memory circuit 22
Is input to the screen synthesizing circuit 5 to be digitally synthesized and input to the video processing circuit 7.

In the video display device shown in FIG. 13, a digital video A is input to the input terminal 10A, and the video A is input to the screen synthesizing circuit 5 as a digital video A to be synthesized. Digital video B is input to the input terminal 10B,
A predetermined portion of the image B is stored in the memory circuit 22, read out in synchronization with the output of the synchronization switching circuit 6, and input to the screen synthesizing circuit 5 as the other digital image B to be synthesized. The image synthesizing circuit 5 synthesizes the digital image A and the digital image B, and the image processing circuit 7 performs image processing such as amplitude adjustment and contour correction on the image synthesized image signal,
It is displayed on the digital display 9.

Therefore, according to the video display apparatus shown in FIG. 13, video A and video B having different frequencies are input and through display of video A, enlarged display of video B, or composite screen display of video A and video B are performed. It can be performed on a digital display.

The dummy circuit board 31 'shown in FIG.
By correcting the input of the image B, and making the image B correspond to the analog input and the digital output, it is possible to insert the dummy circuit board 31 'into the image display device 1 shown in FIG. The effect is exactly the same as in FIG.

The enlarged circuit board 34 shown in FIG.
Similarly to the enlargement circuit board 34 in FIG. 12, by controlling the read frequency of the memory circuit 22 for the digital display 9, the image B can be enlarged and the function of the enlargement processing can be realized.

The video display device shown in FIG. 13 is for the case where the video A and the video B are digital inputs, but the configuration when the video A or the video B is digital or analog is shown in FIGS. It is clear from the configuration of the video display device shown in FIGS. For example, in the configuration of the video display device shown in FIG. 10, the D / A conversion circuit 23 is removed, and the analog display 8 is replaced with the digital display 9 so that analog video A and video B are input and displayed on the digital display 9. A configuration for displaying a composite screen is possible.

In the video display apparatus described above, the video A is directly input to the main body of the video display apparatus 1, but the video B is not directly input to the main body of the video display apparatus 1. Therefore, next, an embodiment in which both the video A and the video B are directly input to the main body of the video display device 1 will be described with reference to FIGS.

FIG. 14 is a perspective view showing an input terminal portion and a circuit board to be inserted of an image display device according to a twelfth embodiment of the present invention.

As shown in FIG. 14 (a), the main body of the video display device 1 has input terminals 10A and 10B 'for video signals A and B and input terminals for synchronization signals corresponding to the video A and B. 40A and 40B, an insertion port 600 for an enlarged circuit board for signal processing for enlarging and reducing the image B, and a display control terminal 30W for performing display control are provided in the housing. The configuration of the main body of the video display device 1 is different from that of FIG. 1 in that the main body of the video display device 1 already has two input terminals necessary for displaying the video A or the video B through. Yes, that is, only the main body of the video display device 1 has a function of two-system input without inserting the dummy circuit board 31 '.

Further, as shown in FIG.
Circuit board 31, in which the signal processing circuit 20 is mounted, the input terminal 10B of the video signal for the video B, the enlargement control terminal 30X, and the video display device 1 It has an input / output terminal 39 having at least an output terminal 39-1 of a video signal for the video B for connection with the video B, and also has an input terminal concealing plate 31-A.

That is, the enlarged circuit board 31 has the same circuit function as the enlarged circuit board 31 in FIG. 1 except that the enlarged circuit board 31 is provided with an input terminal concealing plate 31-A. By inserting the image B into the insertion slot 600 of the main body of the image display device 1, the function of enlarging the image B can be realized. When the enlarged circuit board 31 is inserted, the image display device 1
Since the display control becomes complicated by simultaneously providing the through input terminal 10B 'of the main body of FIG. 1 and the input terminal 10B for enlargement processing, the input terminal 10B' is concealed by the input terminal concealing plate 31-A of the enlarged circuit board 31. Configuration. Needless to say, the configuration is not limited to the configuration shown in FIG. 14B, and if the display control can be complicated, the input terminal concealing plate 31-A of the enlarged circuit board 31 is unnecessary.

As shown in FIG. 14C, the dummy circuit board 31 'has only a function of concealing the insertion slot 600. That is, the dummy circuit board 31 'does not have a circuit function, but merely covers the board insertion slot 600.

FIG. 15 is a block diagram showing a video display device in which the enlarged circuit board shown in FIG. 14 is inserted. In this video display device, a specific one of two analog input video signals is enlarged and processed. Analog synthesis and display on analog display.

The structure of the video display device shown in FIG.
Is almost the same as the configuration of
2 is different from FIG. 2 in that an input terminal 10B ′ for the image B and a signal switching circuit 5 ′ for switching and selecting an image from the terminal 10B ′ and the terminal 10B-1 and inputting the image to the screen synthesizing circuit 5 are provided.

Under the control of the signal switching circuit 5 ', for example, the following operations can be performed. (1) When the enlarged circuit board 31 is inserted, the video signal from the terminal 10B-1 is switched, and the enlarged circuit board 3
When 1 is not inserted, the video signal from the terminal 10B 'is switched. Thus, switching of the enlarged display of the video A and the video B can be performed or the composite display can be performed when the enlarged circuit board 31 is inserted, and through video A and the video B can be displayed when the enlarged circuit board 31 is not inserted. The display can be switched. This is the operation when the enlarged circuit board 31 includes the input terminal shielding plate 31-A as shown in FIG.

(2) The signal switching circuit 5 'is operated with the enlarged circuit board 31 inserted. This makes it possible to switch between the through display of the image A and the enlarged display of the image B or the through display of the image B. This is because the enlarged circuit board 31 has the input terminal shielding plate 31 as shown in FIG.
This is the operation in the case where the A is not provided.

The signal switching circuit 5 'is not always a necessary component. For example, when the enlarged circuit board 31 includes the input terminal shielding plate 31-A as shown in FIG. 14B, the signal switching circuit 5 'can be omitted. That is, when the enlarged circuit board 31 is inserted, the terminal 10B is shielded by the input terminal shielding plate 31-A, and the terminal 10B 'and the terminal 10B in FIG. 15 cannot be used at the same time. And the terminal 10B-1 can be short-circuited and input to the screen composition circuit 5.

Further, even when the enlarged circuit board 31 does not have the input terminal shielding plate 31-A as shown in FIG. 14B, the signal switching circuit 5 'can be eliminated. That is, with the enlarged circuit board 31 inserted, FIG.
If the terminal 10B ′ is not used as an input terminal for the video signal B, the terminal 10B ′ and the terminal 10B-1 can be short-circuited and input to the screen composition circuit 5.
In this case, there is an effect that the terminal 10B 'can be used as an enlarged output terminal of the image B.

FIG. 16 is a perspective view showing an input terminal portion and a circuit board to be inserted of an image display device according to a thirteenth embodiment of the present invention.

As shown in FIG. 16 (a), the main body of the video display device 1 has video signal input terminals 10A and 10B for video A and video B, and a synchronization signal input terminal 40A corresponding to video A and video B. , 40B, an insertion port 600 such as an enlarged circuit board for signal processing for enlarging or reducing the image B, and a display control terminal 30W for performing display control in the housing. The configuration of the main body of the video display device 1 is different from that of FIG.
The main point of the video display device 1 is that it already has two input terminals required for displaying the video A or the video B through, that is, without inserting the dummy circuit board 31 ′. The point is that only the main body of the video display device 1 has a function of two-system input.

Also, as shown in FIG.
Circuit board 31, in which the signal processing circuit 20 is mounted, and the enlargement control terminal 30X and the video B for connection with the video display device 1 are connected. Video signal input terminal 39-B,
An input / output terminal 39 having at least an output terminal 39-1 of a video signal for the video B is provided.

As shown in FIG. 16C, the dummy circuit board 31 'has only a function of concealing the insertion slot 600. That is, the dummy circuit board 31 'does not have a circuit function, but merely covers the board insertion slot 600.

In this embodiment, the main body of the video display device 1 is
The point having the function of system input and the enlarged circuit board 31
14 in that the same effect as in FIG. 1 can be obtained by inserting a video input terminal, the enlarged circuit board 31 removes the input terminal of the video B and replaces the video input terminal with the row of the input / output terminals 39. The configuration differs from FIG. 14 in that the configuration is such that an input signal of video B is taken in from the main body of the video display device 1 by adding 39-B.

FIG. 17 is a block diagram showing a video display device in which the enlarged circuit board shown in FIG. 16 is inserted. In this video display device, a specific one of two analog input video signals is enlarged and processed. Analog synthesis and display on analog display.

The structure of the video display device shown in FIG.
Is almost the same as the configuration of
The input terminal 10B of the image B and the image B
And a signal switching circuit 5 'for switching and selecting an image from the terminal 10B' and the terminal 10B-1 for input to the screen synthesizing circuit 5, and an enlargement circuit board 31. 2 in that an input terminal 39-B is provided and an image B is input from the main body of the image display device 1.

The configuration of the video display device shown in FIG. 17 is almost the same as that of FIG. 15, but is different from that of FIG. 15 only in that the external input terminal 10B of the video B is one system.

Therefore, under the control of the signal switching circuit 5 ',
For example, the following operation is possible as in FIG.

(1) When the enlarged circuit board 31 is inserted, the video signal from the terminal 10B-1 is switched. When the enlarged circuit board 31 is not inserted, the terminal 10B is switched.
Switch the video signal from. Thus, switching of the enlarged display of the images A and B or combination display is possible when the enlarged circuit board 31 is inserted, and through-images of the images A and B can be displayed when the enlarged circuit board 31 is not inserted. The display can be switched.

(2) The signal switching circuit 5 'is operated with the enlarged circuit board 31 inserted. This makes it possible to switch between the through display of the image A and the enlarged signal of the image B or the through display of the image B.

In the image display device shown in FIG. 17, the through signal and the enlarged signal of image B are input to the signal switching circuit 5 'when the enlarged circuit board 31 is inserted. Obviously, as long as the configuration is the same as that in FIG. 2, a circuit corresponding to the signal switching circuit 5 'is required.

As described above, the embodiments of FIGS. 14 to 17 are the embodiments in which the input terminal of the image B is provided in the main body 1 of the image display device 1, but the embodiment of the other terminal arrangement is not limited. For example, it is clear from the description of the above-described embodiment that it is possible to provide an input terminal for a video A or the like on the insertion circuit boards 31, 31 '.

FIG. 18 is a block diagram showing a video display device according to a fourteenth embodiment of the present invention in which an enlarged circuit board is inserted. This video display device converts two analog input video signals together. The analog processing is performed by enlarging the image and displayed on an analog display.

The configuration of the video display device 1 shown in FIG. 18 differs from that of FIG. 2 in that two enlarged circuit boards 31 in FIG. 2 are provided, and the other configuration is the same as that of FIG. That is, the image display device shown in FIG. 18 includes (1) an enlargement circuit board 31A for enlarging the image A input to the input terminal 10A,
An enlargement circuit board 31B is provided for enlarging the image B input to 0B. (2) The enlarged circuit board 31B is exactly the same as the enlarged circuit board 31 in FIG. (3) The configuration of the added enlarged circuit board 31A is exactly the same as that of the enlarged circuit board 32 in FIG. Regarding the connection with the peripheral circuit, the write control circuit 24A of the enlarged circuit board 31A in FIG.
Is synchronized with the synchronization A input to the input terminal 40A, the enlargement control circuit 25A is controlled by the enlargement X input to the input terminal 30X, and the read control circuit 26A synchronizes with the switching output of the synchronization switching circuit 6.

The operation of the video display device shown in FIG. 18 is as follows. The video A is input to the input terminal 10A, the predetermined portion of the video A is enlarged by the enlargement circuit board 31A, and the switching output of the synchronous switching circuit 6 is output. In synchronization, the video A is input to the screen composition circuit 5 as one signal to be composed. The video B is input to the input terminal 10B, and the video B is input to the enlarged circuit board 2.
Of the screen synthesizing circuit 5 as another signal to be synthesized by synthesizing the predetermined portion of
To enter. The video processing circuit 7 performs video processing such as amplitude adjustment and contour correction on the video signal synthesized on the screen, and displays the video signal on the analog display 8.

In the operation of the video display device shown in FIG. 18 described above, six display modes are possible depending on the states of the screen synthesizing circuit 5 and the synchronization switching circuit 6. (1) A case where only the video A input to the input terminal 10A is displayed at the same frequency as the synchronization A. (2) A case where only the video A input to the input terminal 10A is displayed at the same frequency as the synchronization B. (3) A case where only the video B input to the input terminal 10B is displayed at the same frequency as the synchronization B. (4) A case where only the image B input to the input terminal 10B is displayed at the same frequency as the synchronization A. (5) A case where the video A and the video B input to the input terminal 10A and the input terminal 10B are combined and displayed at the same frequency as the synchronization A. (6) A case where the video A and the video B input to the input terminal 10A and the input terminal 10B are combined and displayed at the same frequency as the synchronization B.

Most of the modes are almost the same as those in FIG. 2 and can be realized as follows. (1) When only the video A input to the input terminal 10A is displayed at the same frequency as the synchronization A, the synchronization switching circuit 6
And the screen composition circuit 5 passes only the image A (hereinafter, enlarged image A) processed by the enlarged circuit board 31A. That is, the screen synthesis circuit 5 outputs only the enlarged image A, and the image processing circuit 7 performs image processing synchronized with the synchronization A on the enlarged image A, and displays only the enlarged image A on the analog display 8. Here, the enlargement circuit board 2A performs enlargement processing on the image A, and outputs an output signal of the synchronization switching circuit 6, that is, the enlarged image A in synchronization with the synchronization A in the mode (1).

(2) When only the video A input to the input terminal 10A is displayed at the same frequency as the synchronization B, the synchronization B is passed by the synchronization switching circuit 6, and the screen composition circuit 5 is processed by the enlargement circuit board 31A. Only the image A (hereinafter, enlarged image A) is passed. That is, the screen synthesis circuit 5 outputs only the enlarged image A, and the image processing circuit 7 performs image processing synchronized with the synchronization B on the enlarged image A, and outputs the analog display 8.
Only the enlarged image A is displayed. Here, the enlarged circuit board 3
In 1A, an enlargement process is performed on the image A, and an enlarged image A is output in synchronization with the output signal of the synchronization switching circuit 6, in this mode (2), in synchronization with the synchronization B.

(3) When only the video B input to the input terminal 10B is displayed at the same frequency as the synchronization B, the synchronization switching circuit 6 passes the synchronization B, and the screen synthesizing circuit 5 is processed by the enlargement circuit board 31B. Only the image B (hereinafter, the enlarged image B) is passed. That is, the screen synthesis circuit 5 outputs only the enlarged image B, and the image processing circuit 7 performs image processing synchronized with the synchronization B on the enlarged image B, and the analog display 8
Only the enlarged image B is displayed. Here, the enlarged circuit board 3
In 1B, an enlargement process is performed on the image B, and an output signal of the synchronization switching circuit 6 is output. In this mode (3), the enlarged image B is output in synchronization with the synchronization B.

(4) When only the video B input to the input terminal 10B is displayed at the same frequency as the synchronization A, the synchronization switching circuit 6 passes the synchronization A, and the screen synthesizing circuit 5 is processed by the enlargement circuit board 31B. Only the image B (hereinafter, the enlarged image B) is passed. That is, the screen synthesis circuit 5 outputs only the enlarged image B, and the image processing circuit 7 performs image processing synchronized with the synchronization A on the enlarged image B,
Only the enlarged image B is displayed. Here, the enlarged circuit board 3
In 1B, an enlargement process is performed on the image B, and an enlarged signal B is output in synchronization with the output signal of the synchronization switching circuit 6, in this mode (4), in synchronization with the synchronization A.

(5) Input terminal 10A and input terminal 10
When synthesizing the video A and the video B to be input to B and displaying them at the same frequency as the synchronization A, the synchronization switching circuit 6
Is an image A (hereinafter referred to as an enlarged image A) processed by the enlarged circuit board 31A and passed through the synchronization A, and an enlarged circuit board 31B
The video B (hereinafter, enlarged video B) processed in step (1) is appropriately switched and output. That is, a composite screen of the enlarged video A synchronized with the video A and the enlarged video B also synchronized with the video A is output from the screen synthesizing circuit 5. After performing the processing, it is displayed on the analog display 8.

(6) Input terminal 10A and input terminal 10
When synthesizing the video A and the video B to be input to B and displaying them at the same frequency as the synchronization B, the synchronization switching circuit 6
Is an image A (hereinafter, referred to as an enlarged image A) processed by the enlarged circuit board 31A after passing through the synchronization B and an enlarged circuit board 31B
The video B (hereinafter, enlarged video B) processed in step (1) is appropriately switched and output. That is, a composite screen of the enlarged video A synchronized with the video B and the enlarged video B also synchronized with the video B is output from the screen synthesizing circuit 5, and the video processing circuit 7 outputs the video synchronized with the synchronous B to the synthesized screen. After performing the processing, it is displayed on the analog display 8.

Therefore, according to the video display device shown in FIG. 18, the video A and the video B having different frequencies are inputted and the enlarged display of the video A, the enlarged display of the video B, or the composite screen display of the video A and the video B are performed. The display frequency can be set for both the video A and the video B.

In the video display device 1 shown in FIG.
It is possible to operate by inserting the dummy circuit board 31 ', and the effect is exactly the same as that of FIG.

The video display device shown in FIG. 18 enlarges two analog input video signals together, synthesizes the analog signals, and displays them on an analog display.
Other combinations include a case where the video signal is not only analog but also digital, or a case where analog and digital are mixed. The configuration in each of these cases can be realized by appropriately combining the configurations of the video display devices shown in FIGS. 2 and 10 to 12.

Now, all of the video display devices described above are
Although the video display device has two inputs, the case where there are three or more inputs can be dealt with by increasing the number of inserted enlarged circuit boards. For example, in the case of a video display device with three inputs of video A, video B, and video C,
(1) In order to insert two enlarged circuit boards, two insertion ports are provided in the main body of the video display device 1, and (2) an input terminal for displaying the video video A through and synchronization A, synchronization B, and synchronization C.
Is provided on the main body of the video display device 1.

Thus, for example, the following display modes are possible. (1) A case where only the video A input to the input terminal 10A is displayed through. (2) A case where only the video B input to the input terminal 10B is displayed at the same frequency as the synchronization B. (3) A case where only the image B input to the input terminal 10B is displayed at the same frequency as the synchronization A. (I) When only the video C input to the input terminal 10C is displayed at the same frequency as the synchronization C. (N) A case where a video A input to the input terminal 10A is combined with a video B and a video C input to the input terminal 10B and the input terminal C, respectively, and displayed at the same frequency as the synchronization A.

In each display mode, only the number of video signals to be synthesized is plural, and the display mode is basically based on the same operation as each display mode described above. Therefore, the same applies to the realization method.

According to the three-system input video display apparatus described above, a plurality of videos A, B, and C having different frequencies are input and the through display of the video A, the enlarged display of the video B, and the enlarged display of the video C are performed. Alternatively, it is possible to display a composite screen of the video A and the video B. In the through display of the image A or the composite display including the image A, the display frequency is the same as the synchronization A. However, in the other display modes, the display frequency can be synchronized with the synchronization A, the synchronization B, and the synchronization C. is there.

Also, the dummy circuit board 31 'shown in FIG.
It is possible to insert the dummy circuit board 31 'into the above-mentioned three-system input video display device and operate it by correcting the input of the video B to make the video B correspond to the analog input and the digital output. The effect is exactly the same as in FIG.

In the above description, the enlarged circuit board for the image A is not provided. However, it is also possible to provide an enlarged circuit board for the image A. In this case, the images A, B, and C can be completely equivalently processed, and the display mode in the image display device further increases.

In the above description, the images A, B, and C are intentionally used as analog signals, and these are combined with the analog signals. However, by appropriately combining the configurations of the video display devices shown in FIGS.
It is needless to say that B and C can be combined in either analog or digital, and the screen combining circuit 5 can be combined in analog or digital.

It is apparent that the above-described three-system input video display device can be disclosed as well as three or more-system input video display devices.

By the way, in the video display device described above, the synchronization signals (synchronization A and synchronization B) are transmitted to the video display device 1.
Of the read control circuit 26.
Synchronization signals are not necessarily limited to only external inputs. Therefore, an embodiment in which a synchronization signal inside the video display device 1 is used will be described next with reference to FIG.

FIG. 19 is a block diagram showing a video display device with an enlarged circuit board inserted therein according to a fifteenth embodiment of the present invention. This video display device has a synchronous circuit for driving an analog display 8 therein. It has a generation circuit 400.

The structure of the video display device shown in FIG.
The configuration is almost the same as the configuration shown in FIG. 2, except that the input terminal of the synchronization A is deleted, and a synchronization generation circuit 400 for generating the synchronization A ′ is built in the video display device 1. 2 is different from FIG.

The following operations are possible in the video display device shown in FIG. (1) When the enlarged circuit board 31 is inserted, the synchronization B
To enlarge / reduce the image B, and display only the processing screen of the image B in synchronization with the synchronization A ′ or the synchronization B.

(2) Dummy circuit board 3 for inputting image B
When 1 'is inserted, the video B is displayed through by inputting the synchronization B to the terminal 40B.

(3) When the enlarged circuit board 31 is not inserted, the video A is input to the terminal 10A and the synchronization A is input to the terminal 40B instead of the synchronization B, so that the video A is displayed through.

Thus, in the video display device shown in FIG. 19, the video B is displayed with the enlarged circuit board 31 inserted.
Can be displayed in synchronization with the internal synchronization or the external synchronization, and when the enlarged circuit board 31 is not inserted, there is an effect that the video A or the video B can be displayed through.

In the video display device shown in FIG. 19, since the synchronization switching circuit 6 is configured to switch between the synchronization B and the synchronization A ′ by two-system input, there is a limitation on the display of the combined video A and video B. For example, a configuration is possible in which the synchronization switching circuit 6 switches between synchronization A, synchronization B, and synchronization A 'by three-system input. In this case, in addition to the effect of the video display device shown in FIG. The effect is added that the image B can be enlarged or reduced in synchronization with the '.

The embodiments described above all relate to the video display device. Therefore, an embodiment of a screen display system and a multi-screen display system using such an image display device will be described next with reference to FIGS.

FIG. 20 is a block diagram showing a screen display system as a sixteenth embodiment of the present invention. In this screen display system, the video display device of each embodiment described above is used alone.

The screen display system shown in FIG. 20 comprises an image display device 1 composed of any one of the image display devices of the embodiments described above, an EWS (Engineering Work Station) signal source 100, and an NTSC (National Television System).
s Commitee; TV broadcast standard) signal source 101, AV
(Audio Visual) Controller 200 and Centralized Control Desk 3
00 and a lecture table 500.

In the screen display system shown in FIG. 20, the lecturer is located on the podium 500, and the progress manager is located on the centralized control console 300, and the EWS or NTSC video is displayed on one video display device 1. And a pointer (instruction arrow) from the lecture table 500 is synthesized and displayed.

That is, the drawings to be displayed on the video display device 1,
A video or pointer control instruction is transmitted from the podium 500 to the central control console 300 via the path 50, and image information such as a pointer is transmitted to the video display apparatus 1 via the path 12. The central control console 300 controls the AV controller 200 via the path 35 in accordance with the program of the lecture progress, and controls the path 3 from the AV controller 200.
The display of the video display device 1 is controlled via 5 '. The AV controller 200 switches the video from the EWS signal source 100 or the NTSC signal source 101 based on the control information from the central control console 300 and sends the switched video to the video display device 1 via the path 11. Video display device 1
Then, display control is performed based on the control information from the path 35 ', and a pointer or the like from the path 12 can be combined with the EWS or NTSC video from the path 11 on the same screen.

Therefore, in the screen display system shown in FIG. 20, the image display device of each of the above-described embodiments is constituted by itself, and displays images from a plurality of signal sources having different frequencies. An image such as a pointer can be synthesized and displayed on the image.

It should be noted that many other arrangements are conceivable for the arrangement of each device, and various other arrangements are also possible. For example, when it is desired to increase the number of composite screens, it is possible to use the video display device 1 having three or more inputs.

FIG. 21 is a block diagram showing a multi-screen display system according to a seventeenth embodiment of the present invention. In this multi-screen display system, four video display devices of the above embodiments are used in combination. I have.

The multi-screen display system shown in FIG.
Four video display devices 1-1, 1-2, 1-3, 1-4 each comprising one of the video display devices of the embodiments described above.
And EWS (Engineering Work Station) signal source 100
, A VGA (Video Graphic Array) signal source 102, and N
TSC (National Television Systems Committee; TV
Broadcast standard) signal source 101 and HD (High Definition
or Hi Vision) signal source 103 and AV (Audio Visual)
It comprises a controller 201 and a central control console 301.

In the multi-screen display system shown in FIG. 21, a display observer is located on the central control console 301, and EWS, VGA, and NTS are displayed on four video display devices 1-1 to 1-4.
A plurality of images such as C and HD are displayed and synthesized.

That is, in the central control console 301, the AV controller 20 is routed through the path 36 in accordance with the display program.
Of the video display devices 1-1, 1-2, 1-3, and 1-4 via paths 36-1, 36-2, 36-3, and 36-4 from the AV controller 201, respectively. Perform display control. In the AV controller 201, based on the control information from the central control console 301, the EWS signal source 1
00, VGA signal source 102, NTSC signal source 101, H
The video from the D signal source 103 or the like is switched, and the switched video is transferred to the two paths 11-1 and 12-1 and 11-2.
And the image display devices 1-1, 1-1, 12-3, 12-3, 11-4, and 12-4, respectively.
-2, 1-3, and 1-4. In these video display devices 1-1 to 1-4, display control is performed based on the control information from the paths 36-1 to 36-4, respectively, and the two paths 11
-1 and 12-1, 11-2 and 12-2, 11-3 and 12-3, 11-4 and 12-4, one screen of EWS, VGA, NTSC, HD, etc. Display, two-sided display, three-sided display, four-sided display, or composite display.

Accordingly, in the multi-screen display system shown in FIG. 21, four video display devices of the above-described embodiments are used to configure the video display device, and the video signals transmitted from a plurality of signal sources having different frequencies are output from one to four. It is possible to display the images on the screen and to combine and display these images for each display device.

It should be noted that many other arrangements are conceivable for the arrangement of each device, and various other arrangements are also conceivable. For example, when it is desired to increase the number of composite screens, it is possible to use the video display device 1 having three or more inputs.

[0164]

As described above, according to the present invention,
By inserting the enlarged circuit board into the video display device,
It is possible to perform a switching display such as equalizing, enlarging / reducing, and combining a plurality of videos on the same screen. In addition, by configuring a multi-screen display system using a plurality of video display devices with an enlarged circuit board inserted therein, even if the number of enlarged screens increases, a housing separate from the video display device (for performing an enlargement process). There is no need to worry about an increase in the number of screen processing units.

Further, by inserting the dummy circuit board into the video display device, it is possible to perform switching display such as multiplying and combining a plurality of videos on the same screen. Further, by inserting the dummy circuit board into the video display device, such a video display device can be applied to a conventional multi-screen display system in which a screen processing unit for performing an enlargement process is arranged outside, and It can also be used as a display.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an input terminal portion and a circuit board to be inserted of an image display device as a first embodiment of the present invention.

FIG. 2 is a block diagram showing a video display device in which the enlarged circuit board shown in FIG. 1 is inserted.

FIG. 3 is a block diagram showing an image display device in which the dummy circuit board shown in FIG. 1 is inserted.

FIG. 4 is a block diagram showing a video display device in which an enlarged circuit board is inserted as a second embodiment of the present invention.

FIG. 5 is a block diagram showing a video display device in which an enlarged circuit board is inserted as a third embodiment of the present invention.

FIG. 6 is a block diagram showing a video display device with an enlarged circuit board inserted as a fourth embodiment of the present invention.

FIG. 7 is a block diagram showing a video display device with an enlarged circuit board inserted therein according to a fifth embodiment of the present invention.

FIG. 8 is a block diagram showing a video display device with an enlarged circuit board inserted therein according to a sixth embodiment of the present invention.

FIG. 9 is a block diagram showing a video display device according to a seventh embodiment of the present invention in which an enlarged circuit board is inserted.

FIG. 10 is a block diagram showing an image display device with an enlarged circuit board inserted therein according to an eighth embodiment of the present invention.

FIG. 11 is a block diagram showing a video display device with an enlarged circuit board inserted therein according to a ninth embodiment of the present invention.

FIG. 12 is a block diagram showing a video display device in which an enlarged circuit board is inserted as a tenth embodiment of the present invention.

FIG. 13 is a block diagram showing an image display device with an enlarged circuit board inserted therein according to an eleventh embodiment of the present invention.

FIG. 14 is a perspective view showing an input terminal portion and a circuit board to be inserted of an image display device as a twelfth embodiment of the present invention.

FIG. 15 is a block diagram showing a video display device in which the enlarged circuit board shown in FIG. 14 is inserted.

FIG. 16 is a block diagram showing a video display device with an enlarged circuit board inserted according to a thirteenth embodiment of the present invention.

17 is a block diagram showing a video display device in which the enlarged circuit board shown in FIG. 16 is inserted.

FIG. 18 is a block diagram showing a video display device with an enlarged circuit board inserted therein according to a fourteenth embodiment of the present invention.

FIG. 19 is a block diagram showing a video display device with an enlarged circuit board inserted as a fifteenth embodiment of the present invention.

FIG. 20 is a block diagram showing a screen display system as a sixteenth embodiment of the present invention.

FIG. 21 is a block diagram showing a multi-screen display system as a seventeenth embodiment of the present invention.

[Explanation of symbols]

1 Video Display Device 10A Input Terminal for Video A 10B Input Terminal for Video B 30X Input Terminal for Enlarged X 30W Input Terminal for Control W 40A Input Terminal for Synchronization A 40B {Input terminal of synchronous B 31} Enlarged circuit board (analog input: analog output) 31 '{Dummy circuit board (analog input: analog output) 32} Enlarged circuit board (analog input: digital output) 33} {Enlarged circuit board (digital input: analog output)} 34 {enlarged circuit board (digital input: digital output) 39} I / O terminal of enlarged circuit board 31 for insertion 4} display control circuit 5 ‥‥‥‥ Screen synthesis circuit 5 '‥‥‥ Signal switching circuit 6 ‥‥‥‥ Synchronization switching circuit 6' ‥‥‥ Synchronization switching circuit 7 ‥‥‥‥ Video processing circuit 8 ‥‥‥‥ Analog display << Digital display 21 >> A / D conversion circuit 22 >> Memory circuit 23 >> D / A conversion circuit 24 >> Write control circuit 26 >> Read control circuit 25 >> Enlargement control circuit 100 EWS signal source 101 NTSC signal source 102 VGA signal source 103 HD signal source 200 AV controller 201 AV controller 300 Centralized control console 301 Centralized control console 400 ‥‥ Synchronization circuit 500 ‥‥ Lecture table 600 台 Board slot

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Urata 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi, Ltd. Visual Media Research Laboratories (72) Inventor Fumio Inoue 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock (72) Inventor Tadashi Ogino, Kanagawa Prefecture, Yokohama, Japan 292, Yoshida-cho, Totsuka-ku, Japan Hitachi, Ltd.Information Video Media Division (72) Inventor Kiyoshi Yamamoto, 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Japan (56) References JP-A-1-300683 (JP, A) JP-A-61-228691 (JP, A) JP-A-61-127285 (JP, A) 7-75014 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/262-5/265 H04N 5/44-5/45 G09G 5/00 530

Claims (23)

(57) [Claims] 1. A method for inserting a substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted through the mouth.
The enlargement circuit board transmits the first video signal (video B).
Input terminal (10B) for external input into the board
And an enlargement control signal (enlargement X) is input from the outside into the board.
Input terminal (30X) for input to the board
The first video signal is enlarged based on the enlargement control signal.
Signal processing means for performing processing and outputting, and the signal processing means
Outputting the first video signal output from the
And an output terminal (39-1) for
The main body transmits the second video signal (video A) from the outside to the inside of the main body.
An input terminal (10A) for inputting to the
A first synchronization signal (synchronization B) corresponding to the image signal
An input terminal (40B) for inputting into the main body;
Out of the second synchronization signal (synchronization A) corresponding to the second video signal.
An input terminal (40A) for inputting into the main body from the unit,
The first and second synchronization signals input to the main body are input.
To select and output one of the synchronization signals.
Replacement means (6), and the first and second input means in the main body.
Input two video signals and output one video signal as it is
Or composite both video signals and output
Means (5), and a synchronization signal output from the synchronization switching means.
To the video signal output from the combining means
Video processing means (7) for performing video processing and outputting;
The video is displayed based on the video signal output from the image processing means.
And a display (8).
Image display device. 2. The method according to claim 1 , wherein the substrate is inserted into a main body having a substrate insertion opening.
A video display device with a dummy circuit board inserted from the mouth.
Thus, the dummy circuit board is provided with a first video signal (video
B) from the outside to the input terminal (10
B), and the first video signal input into the substrate is
Output terminal (39-1) for outputting to the main body
And the main body externally outputs the second video signal (video A).
An input terminal (10A) for inputting into the main body from the unit,
A first synchronization signal (synchronization signal) corresponding to the first video signal;
B) input terminal (40)
B) and a second synchronization signal corresponding to the second video signal
Input terminal for inputting (Synchronization A) from outside into the main unit
(40A) and the first and second data input into the main body.
Input the sync signal and select one of the sync signals
Synchronization switching means (6) for output and before input to the main unit
The first and second video signals are input, and one video signal is input.
Output as is, or combine both video signals
Output from the synchronizing switching means.
Output from the synthesizing means in accordance with the input synchronization signal.
Video processing means for performing video processing on the output video signal and outputting the processed video signal
(7), based on the video signal output from the video processing means.
A display (8) for displaying an image based on the
An image display device characterized by comprising: 3. The method of inserting a substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted through the mouth.
The enlargement circuit board transmits the first video signal (video B).
Input terminal (10B) for external input into the board
And a first synchronizing signal (same as the first video signal)
Input terminal (4) for inputting the period B) from the outside into the substrate.
0B) and the enlargement control signal (enlarged X) from the outside into the substrate
Input terminal (30X) for inputting
The first video signal obtained based on the enlargement control signal.
Signal processing means for performing an enlarging process and outputting
The first video signal output from the
Output terminal (39-1) for output and input in the board
Output the first synchronization signal to the main body.
And an output terminal (39-2).
Inputs the second video signal (video A) from outside into the main unit
Input terminal (10A) for the second video signal
The second synchronization signal (Synchronization A) corresponding to
Input terminal (40A) for input to the device and input to the main unit
And input the first and second synchronization signals.
Synchronization switching means (6) for selecting and outputting one of the synchronization signals
And the first and second video signals input into the main body
Or output one video signal as it is
Is a synthesizing means for synthesizing and outputting both video signals (5)
In accordance with the synchronization signal output from the synchronization switching means.
Video processing on the video signal output from the synthesizing means.
Image processing means (7) for applying and outputting the image data;
To display video based on the video signal output from the
And a spray (8).
Image display device. 4. Inserting the substrate into a main body having a substrate insertion port.
A video display device with a dummy circuit board inserted from the mouth.
I, the dummy circuit board includes a first video signal (video
B) from the outside to the input terminal (10
B) and a first synchronization signal corresponding to the first video signal
Input terminal for inputting (Synchronization B) from outside into the board
(40B) and the first video signal input into the substrate
An output terminal (39-1) for outputting to the main body;
The first synchronization signal input into the board is output to the main body.
And an output terminal (39-2) for inputting power.
The main unit transmits the second video signal (video A) from outside
An input terminal (10A) for inputting into the main body;
Out of the second synchronization signal (synchronization A) corresponding to the second video signal.
An input terminal (40A) for inputting into the main body from the unit,
The first and second synchronization signals input to the main body are input.
To select and output one of the synchronization signals.
Replacement means (6), and the first and second input means in the main body.
Input two video signals and output one video signal as it is
Or composite both video signals and output
Means (5), and a synchronization signal output from the synchronization switching means.
To the video signal output from the combining means
Video processing means (7) for performing video processing and outputting;
The video is displayed based on the video signal output from the image processing means.
And a display (8).
Image display device. 5. Inserting the board into a main body having a board insertion port.
An image display device with an enlarged circuit board inserted through the mouth.
The enlargement circuit board transmits the first video signal (video B).
Input terminal (10B) for external input into the board
And a first synchronizing signal (same as the first video signal)
Input terminal (4) for inputting the period B) from the outside into the substrate.
0B) and the third synchronization signal (synchronization G) from the outside to the substrate
Input terminal (40G) for inputting to the
Input terminal for inputting (enlarged X) from outside into the board
(30X) and the first video signal input into the substrate
And performs an enlargement process based on the enlargement control signal and outputs
Signal processing means, and a signal output from the signal processing means.
An output terminal for outputting the first video signal to the main body;
(39-1) and the first and second data input into the substrate.
3 at least one of the synchronization signals
First synchronous switching means (6) for selecting and outputting a signal,
The synchronization signal output from the first synchronization switching means (hereinafter referred to as off
Output terminal for outputting an external synchronization signal) to the main unit.
(39-4), and the main body comprises a second
To input the video signal (video A) from outside to the main unit
And an input terminal (10A) corresponding to the second video signal.
Input a second synchronization signal (synchronization A) from the outside into the main unit.
Input terminal (40A) for input to the main unit
Receiving the second synchronization signal and the switching synchronization signal,
Second synchronization switching means for selecting and outputting one of the synchronization signals
(6 ′) the first and second images input into the main body
Input image signal and output one video signal as it is
Or a combining means for combining and outputting both video signals
(5) and the synchronization output from the second synchronization switching means.
A video signal output from the synthesizing means in accordance with the signal
Video processing means (7) for performing video processing on the
A video is generated based on the video signal output from the video processing means.
And a display (8) for displaying.
Characteristic video display device. 6. Inserting the board into a main body having a board insertion port.
A video display device with a dummy circuit board inserted from the mouth.
Thus, the dummy circuit board is provided with a first video signal (video
B) from the outside to the input terminal (10
B), and the first video signal input into the substrate is
An output terminal (39-1) for outputting to the main body;
Out of the first synchronization signal (synchronization B) corresponding to the first video signal
An input terminal (40B) for inputting into the board from the unit;
A third synchronization signal (synchronization G) is externally input into the substrate.
Input terminal (40G) for
Input at least the first and third synchronization signals,
First synchronization switching means for selecting and outputting one synchronization signal
(6) and the synchronization signal output from the first synchronization switching means.
Signal (hereinafter referred to as switching synchronization signal) to the main unit
And an output terminal (39-4) for
The main unit transmits the second video signal (video A) from outside to the main unit.
An input terminal (10A) for inputting, and the second video
The second synchronization signal (synchronization A) corresponding to the signal
An input terminal (40A) for inputting into the body and inside the body
The input second synchronizing signal and switching synchronizing signal are input.
And selects and outputs one of the synchronization signals.
Synchronous switching means (6 '), the first and second signals inputted into the main body.
And the second video signal, and one video signal is
Output or combine both video signals for output.
Output from the synthesizing means (5) and the second synchronization switching means.
Output from the synthesizing means in accordance with the synchronized signal
Processing means for applying video processing to the output video signal and outputting the processed video signal
(7) and, based on the video signal output from the video processing unit
A display (8) for displaying an image based on the
An image display device characterized by comprising: 7. A method for inserting a substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted through the mouth.
The enlargement circuit board transmits the first video signal (video B).
Input terminal (10B) for external input into the board
And an enlargement control signal (enlargement X) is input from the outside into the board.
Input terminal (30X) for input to the board
The first video signal is enlarged based on the enlargement control signal.
Signal processing means for performing processing and outputting, and the signal processing means
Outputting the first video signal output from the
And an output terminal (39-1) for
The main body is the same as the first video signal input into the substrate.
To input the same video signal (video B) from outside to the main unit
Input terminal (10B ') and a second video signal (video A)
Terminal (10A) for inputting the signal from outside into the main unit
And a first synchronizing signal (same as the first video signal)
Input terminal (4) for inputting the period B) from outside into the main body.
0B) and a second synchronization signal corresponding to the second video signal.
Input terminal for inputting the signal (synchronization A) from outside into the main unit
Child (40A) and the first and the second
2 sync signal and select one of them
A synchronous switching means (6) for outputting the data by
The first video signal input into the main unit and
Inputting the first video signal input into the main body,
Signal switching means for selecting and outputting one of the video signals
(5 ′) and the second video signal input into the main body.
And a video signal output from the signal switching means,
Either output one video signal as it is or
Synthesizing means (5) for synthesizing and outputting an image signal;
The synthesizing is performed in accordance with the synchronization signal output from the switching means.
Means to apply video processing to the video signal output from the
Video processing means (7) and output from the video processing means.
Display that displays video based on the video signal
(8) A video display device comprising:
Place. 8. Inserting the substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted through the mouth.
The enlarged circuit board is externally input into the main body.
The first video signal (video B) is input from the main body into the substrate
Input terminal (39-B), and an enlargement control signal (enlargement).
Input terminal of the order to enter a large X) than in the substrate outside (3
0X) and the first video signal input into the substrate,
Enlargement processing is performed based on the enlargement control signal and output.
Signal processing means, and the second signal output from the signal processing means.
Output terminal (3) for outputting the video signal of
9-1), wherein the main body is located in front of the outside.
For inputting the first video signal (video B) into the main body.
Disconnect the input terminal (10B) and the second video signal (video A)
An input terminal (10A) for inputting into the main body from the unit,
A first synchronization signal (synchronization signal) corresponding to the first video signal;
B) input terminal (40)
B) and a second synchronization signal corresponding to the second video signal
Input terminal for inputting (Synchronization A) from outside into the main unit
(40A) and the first and second data input into the main body.
Input the sync signal and select one of the sync signals
A synchronous switching means for outputting (6), and from the enlarged circuit board
The first video signal input into the main body and directly from the outside
Input the first video signal input into the main body,
Signal switching means for selecting and outputting one of the video signals
(5 ′) and the second video signal input into the main body.
And a video signal output from the signal switching means,
Either output one video signal as it is or
Synthesizing means (5) for synthesizing and outputting an image signal;
The synthesizing is performed in accordance with the synchronization signal output from the switching means.
Means to apply video processing to the video signal output from the
Video processing means (7) and output from the video processing means.
Display that displays video based on the video signal
(8) A video display device comprising:
Place. 9. The method of inserting a substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted through the mouth.
And externally mounts the analog first video signal (video B).
Input terminal (10B) for inputting into the device, analog
Of the second video signal (video A) from outside into the device
Input terminal (10A) for connecting to the first video signal
A corresponding first synchronization signal (synchronization B) is externally input into the device.
An input terminal (40B) for inputting, and the second video
A second synchronization signal (synchronization A) corresponding to the signal is externally provided.
Input terminal (40A) for inputting into the device, enlargement control
Input for inputting a signal (enlarged X) from outside into the device
Terminal (30X) and display control signal (control W) from outside
An input terminal (30W) for inputting into the device,
Inputting the first and second synchronization signals input to
Synchronous switching means for selecting and outputting one of the synchronous signals
(6) a first image of the analog input into the device;
Converts an image signal into a digital first video signal and outputs it
Analog / digital conversion means (21);
Digital / digital converter output from the digital / digital converter.
1 video signal is written and stored, then read
Memory means (22) to be read from the memory means
Digital first video signal is converted to an analog first video signal.
A digital / analog converter that converts and outputs image signals
Stage (23) and a digital first to said memory means.
The writing of the video signal is performed by the first
Writing control means (24) for controlling in synchronization with a synchronization signal;
Reading a digital first video signal from the memory means
To the synchronization signal output from the synchronization switching means.
Read control means (26) for controlling in synchronization with
The write control means based on the input enlargement control signal
Control means for controlling read-out control means (25)
And output from the digital / analog conversion means.
An analog first video signal and the analog signal input into the device;
The second analog video signal is input and one video signal is
Output as it is or combine both video signals
Screen synthesis means (5) for output
Controlling the screen combining means based on the display control signal.
Display control means (4) and output from the screen synthesizing means.
Video processed and output to the analog video signal
Processing means (7), and an analog output from the video processing means.
Analog display that displays video based on the video signal of the log
And a spray (8).
Analog / digital conversion means, memory means, digital
Analog / analog conversion means, write control means, read control means and
And the enlargement control means are arranged in the enlargement circuit board.
A video display device. 10. A substrate having a substrate insertion opening, wherein said substrate is inserted into a main body.
An image display device with an enlarged circuit board inserted from the entrance
Therefore, the analog first video signal (video B) is externally
An input terminal (10B) for inputting into the device;
Video signal (video A) is input from outside into the device
Input terminal (10A) for inputting the first video signal
The first synchronization signal (synchronization B) corresponding to
An input terminal (40B) for inputting to the second
A second synchronization signal (synchronization A) corresponding to the image signal
An input terminal (40A) for inputting into the device,
Input to input the control signal (enlarged X) into the device from outside
Output terminal (30X) and display control signal (control W)
Input terminal (30W) for input into the device,
Receiving the first and second synchronization signals input into
Synchronization switching that selects and outputs one of the synchronization signals
Means (6), the first analog input to the device.
Video signal is converted to a digital first video signal and output.
First analog / digital conversion means (21)
And output from the first analog / digital conversion means.
The digital first video signal is written and stored.
Memory means (22) to be read out after the
Writing the digital first video signal to the
Control in synchronization with the first synchronization signal input into the device
Writing control means (24) for writing data from the memory means.
The reading of the first video signal of the digital
Read control that controls in synchronization with the synchronization signal output from the means
Control means (26), and the enlarged control signal input into the apparatus.
Control the write control means and the read control means based on the
Controlling the enlargement control means (25) and before inputting into the apparatus
The second analog video signal is converted to a second digital video signal.
A second analog / digital converter for converting the
Conversion means (20), and data read from the memory means.
Digital first video signal and the second analog / digital signal.
Digital second video output from digital conversion means
Signal and output one video signal as it is
Alternatively, a screen combining device that combines and outputs both video signals
Step (5), based on the display control signal input into the device.
Display control means (4) for controlling the screen synthesizing means
And a digital image output from the screen synthesizing means.
A digital signal that converts a signal to an analog video signal and outputs it
Digital / analog conversion means (23);
Video to analog video signal output from log converter
Video processing means (7) for performing processing and outputting,
Video based on the analog video signal output from the
An analog display (8) for displaying an image.
At least the first analog / digital
Conversion means, memory means, write control means, read control means and
And the enlargement control means are arranged in the enlargement circuit board.
A video display device. 11. A method for inserting a substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted from the entrance
Thus, the digital first video signal (video B ) is
Input terminal (10B) for input into the device,
Digital second video signal (video A) from outside into the device
An input terminal (10A) for inputting, and the first video
A first synchronization signal (synchronization B) corresponding to the signal is externally provided.
An input terminal (40B) for inputting into the device;
The second synchronization signal (synchronization A) corresponding to the video signal
An input terminal (40A) for further inputting into the device;
To input a large control signal (enlarged X) into the device from outside
Input terminal (30X) and display control signal (control W)
An input terminal (30W) for inputting into the device from the unit;
Receiving the first and second synchronization signals input into the device;
To select and output one of the synchronization signals.
Replacement means (6), and the digital signal input into the apparatus.
After the first video signal is written and stored, it is read
Memory means (22) to be read and read from the memory means
The converted first digital video signal is converted to an analog first video signal.
First digital / analog converting to video signal and outputting
Conversion means (23) and digital data to the memory means.
Before writing the first video signal into the device
The write control means (2) which controls in synchronization with the first synchronization signal.
4) and the digital first video from the memory means
The reading of the signal is performed in the same manner as that output from the synchronization switching means.
Read control means (26) for controlling in synchronization with the
The writing based on the enlargement control signal input into the device
Enlarging control means for controlling the control means and the reading control means
(25) and the second digital signal input into the device.
Video signal is converted to an analog second video signal and output
Second digital / analog conversion means (19) for performing
Output from the first digital / analog conversion means
Analog first video signal and the second digital /
Analog second video output from analog conversion means
Signal and output one video signal as it is
Alternatively, a screen combining device that combines and outputs both video signals
Step (5), based on the display control signal input into the device.
Display control means (4) for controlling the screen synthesizing means
And an analog video signal output from the screen combining means.
Video processing means (7) for performing video processing on the signal and outputting the processed video;
Based on the analog video signal output from the video processing means.
An analog display (8) for displaying an image based on the
And at least the memory means, the first
Digital / analog conversion means, write control means, read control
Control means and expansion control means, distribution before Symbol expansion circuit board
An image display device, comprising: 12. A method for inserting a substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted from the entrance
Thus, the digital first video signal (video B) is
Input terminal (10B) for input into the device,
Digital second video signal (video A) from outside into the device
An input terminal (10A) for inputting, and the first video
A first synchronization signal (synchronization B) corresponding to the signal is externally provided.
An input terminal (40B) for inputting into the device;
The second synchronization signal (synchronization A) corresponding to the video signal
An input terminal (40A) for further inputting into the device;
To input a large control signal (enlarged X) into the device from outside
Input terminal (30X) and display control signal (control W)
An input terminal (30W) for inputting into the device from the unit;
Receiving the first and second synchronization signals input into the device;
To select and output one of the synchronization signals.
Replacement means (6), and the digital signal input into the apparatus.
After the first video signal is written and stored, it is read
Memory means (22) to be read, and digitizing to the memory means.
Write the first video signal of the
Writing control means for controlling in synchronization with the first synchronization signal
(24) and the digital first from the memory means.
The reading of the video signal is output from the synchronization switching means.
Reading control means (26) for controlling in synchronization with the synchronized signal
Based on the enlargement control signal input into the device.
Enlargement control for controlling writing / reading control means and reading control means
Means (25), and a disk read from the memory means.
Digital video signal and the digital signal input into the device.
Digital second video signal and analog second video signal
Or output one video signal as it is
Is a screen combining means that combines and outputs both video signals
(5), based on the display control signal input into the device,
And display control means for controlling the screen synthesizing means.
And a digital image output from the screen synthesizing means.
A digital signal that converts a signal to an analog video signal and outputs it
Digital / analog conversion means (23);
Video to analog video signal output from log converter
Video processing means (7) for performing processing and outputting,
Video based on the analog video signal output from the
An analog display (8) for displaying an image.
At least the memory means, the write control means,
Read control means and the expansion atmospheric control unit, said enlargement circuit board
An image display device, wherein the image display device is disposed in a device. 13. The apparatus according to claim 13 , wherein said substrate is inserted into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted from the entrance
Thus, the digital first video signal (video B) is
Input terminal (10B) for inputting into the
The second video signal (video A) of the log is input into the device from outside.
An input terminal (10A) for inputting the first video signal;
A first synchronization signal (synchronization B) corresponding to the signal from an external device
An input terminal (40B) for inputting into the
The second synchronization signal (synchronization A) corresponding to the video signal
Input terminal (40A) for input into the device
For inputting a control signal (enlarged X) into the device from outside
Input terminal (30X) and display control signal (control W)
Input terminal (30W) for inputting into the device.
Receiving the first and second synchronization signals input into the device
Synchronization switching that selects and outputs one of the synchronization signals
Means (6) and said digital first input into the device.
1 video signal is written and stored, then read
Memory means (22) to be read from the memory means
Digital first video signal is converted to an analog first video signal.
A digital / analog converter that converts and outputs image signals
Stage (23) and a digital first to said memory means.
The writing of the video signal is performed by the first
Writing control means (24) for controlling in synchronization with a synchronization signal;
Reading a digital first video signal from the memory means
To the synchronization signal output from the synchronization switching means.
Read control means (26) for controlling in synchronization with
The write control means based on the input enlargement control signal
Control means for controlling read-out control means (25)
And output from the digital / analog conversion means.
An analog first video signal and the analog signal input into the device;
The second analog video signal is input and one video signal is
Output as it is or combine both video signals
A screen synthesizing means (5) for output, and before input into the apparatus
Controlling the screen combining means based on the display control signal.
Display control means (4) and output from the screen synthesizing means.
Video processed and output to the analog video signal
Processing means (7), and an analog output from the video processing means.
Analog display that displays video based on the video signal of the log
Made by including a spray (8), the less and also the
Memory means, digital / analog conversion means, write control
Means, read control means and enlargement control means,
Video display device characterized by being arranged in a circuit board
Place. 14. The apparatus according to claim 14 , wherein said substrate is inserted into a body having a substrate insertion opening.
An image display device with an enlarged circuit board inserted from the entrance
Thus, the digital first video signal (video B) is
Input terminal (10B) for inputting into the
The second video signal (video A) of the log is input into the device from outside.
An input terminal (10A) for inputting the first video signal;
A first synchronization signal (synchronization B) corresponding to the signal from an external device
An input terminal (40B) for inputting into the
The second synchronization signal (synchronization A) corresponding to the video signal
Input terminal (40A) for input into the device
For inputting a control signal (enlarged X) into the device from outside
Input terminal (30X) and display control signal (control W)
Input terminal (30W) for inputting into the device.
Receiving the first and second synchronization signals input into the device
Synchronization switching that selects and outputs one of the synchronization signals
Means (6) and said digital first input into the device.
1 video signal is written and stored, then read
Memory means (22) to be read and digital data to the memory means
Writing of the first video signal of the
Write control means for controlling in synchronization with the first synchronization signal
(24) and the digital first from the memory means.
The reading of the video signal is output from the synchronization switching means.
Reading control means (26) for controlling in synchronization with the synchronized signal
Based on the enlargement control signal input into the device.
Enlargement control for controlling writing / reading control means and reading control means
Means (25), and an analog second input to the device.
2 video signal into a digital second video signal
Output analog / digital conversion means (20);
Digital first image read from the memory means
Signal and output from the analog / digital conversion means.
Digital second video signal and one video
Output the signal as is or combine both video signals.
Screen synthesizing means (5) for generating and outputting
Controlling the screen synthesizing means based on the displayed display control signal.
Display control means (4) for controlling
Digital video signal is converted to analog video signal
Digital / analog conversion means (2
And 3) output from the digital / analog converting means
Video processed and output to the analog video signal
Processing means (7), and an analog output from the video processing means.
Analog display that displays video based on the video signal of the log
And a spray (8).
Memory means, write control means, read control means and enlargement control
Controlling means is disposed in the enlarged circuit board.
Characteristic video display device. 15. The apparatus according to claim 15 , wherein said substrate is inserted into a body having a substrate insertion opening.
An image display device with an enlarged circuit board inserted from the entrance
Therefore, the analog first video signal (video B) is externally
An input terminal (10B) for inputting into the device;
Input the second video signal (video A) of the
An input terminal (10A) for inputting the first video signal;
A first synchronization signal (synchronization B) corresponding to the signal from an external device
An input terminal (40B) for inputting into the
The second synchronization signal (synchronization A) corresponding to the video signal
Input terminal (40A) for input into the device
For inputting a control signal (enlarged X) into the device from outside
Input terminal (30X) and display control signal (control W)
Input terminal (30W) for inputting into the device.
Receiving the first and second synchronization signals input into the device
Synchronization switching that selects and outputs one of the synchronization signals
Means (6), the first analog input to the device.
Video signal is converted to a digital first video signal and output.
Analog / digital conversion means (21)
Digital output from analog / digital conversion means
After the first video signal is written and stored,
Memory means (22) issued and read from the memory means
The output first digital video signal is converted to an analog first video signal.
First digital / analog converter for converting the video signal
Log conversion means (23), and a digital data to said memory means
Writing of the first video signal of the
Write control means for controlling in synchronization with the first synchronization signal
(24) and the digital first from the memory means.
The reading of the video signal is output from the synchronization switching means.
Reading control means (26) for controlling in synchronization with the synchronized signal
Based on the enlargement control signal input into the device.
Enlargement control for controlling writing / reading control means and reading control means
Means (25) and said digital input to the device.
Converting the second video signal into an analog second video signal
Second digital / analog conversion means for outputting (19)
When the output from the first digital / analog converter
Analog first video signal and the second digital signal
Of the analog output from the
Input video signal and output one video signal as it is
Or a screen that combines and outputs both video signals.
(5) and the display control signal input into the device.
Display control means for controlling the screen synthesis means based on
(4) and the analog output from the screen combining means.
Video processing means for performing video processing on a video signal and outputting it
(7) and the analog video output from the video processing means.
Analog display that displays video based on image signals
(8), and at least the analog
/ Digital conversion means, memory means, first digital
/ Analog conversion means, write control means, read control means and
And enlargement control means are arranged in the enlargement circuit board.
A video display device characterized by the following. 16. A method for inserting a substrate into a main body having a substrate insertion port.
An image display device with an enlarged circuit board inserted from the entrance
Therefore, the analog first video signal (video B) is externally
An input terminal (10B) for inputting into the device;
Input the second video signal (video A) of the
An input terminal (10A) for inputting the first video signal;
A first synchronization signal (synchronization B) corresponding to the signal from an external device
An input terminal (40B) for inputting into the
The second synchronization signal (synchronization A) corresponding to the video signal
Input terminal (40A) for input into the device
For inputting a control signal (enlarged X) into the device from outside
Input terminal (30X) and display control signal (control W)
Input terminal (30W) for inputting into the device.
Receiving the first and second synchronization signals input into the device
Synchronization switching that selects and outputs one of the synchronization signals
Means (6), the first analog input to the device.
Video signal is converted to a digital first video signal and output.
Analog / digital conversion means (21)
Digital output from analog / digital conversion means
After the first video signal is written and stored,
A memory means (22) to be output and a directory to the memory means.
Digital first video signal is written into the device.
Write control means for controlling in synchronization with the first synchronization signal
Stage (24) and the digital first from the memory means.
Of the video signal is output from the synchronization switching means.
Read control means (26) for controlling in synchronization with the synchronized signal
Based on the enlargement control signal input into the device.
Enlargement control for controlling writing / reading control means and reading control means
Means (25), and a disk read from the memory means.
Digital video signal and the digital signal input into the device.
Digital second video signal, and one video signal
Output as is, or output by combining both video signals.
Screen synthesizing means (5) for inputting and inputting the
A table for controlling the screen combining means based on a display control signal;
Display control means (4) and output from the screen synthesizing means.
Convert digital video signal to analog video signal
Digital / analog conversion means (23) for outputting
Analog output from digital / analog conversion means
Processing means for applying video processing to a video signal and outputting it
(7) and the analog video output from the video processing means.
Analog display that displays video based on image signals
(8), and at least the analog
/ Digital conversion means, memory means, write control means, read
The output control means and the enlargement control means are provided in the enlargement circuit board.
An image display device, comprising: 17. Having first and second substrate insertion ports.
A first enlarged circuit board is inserted into the main body from the first board insertion slot.
And a second enlarged circuit board is inserted through the second board insertion slot.
A video display device comprising a board inserted therein, the analog
1 to input the video signal (video B) from the outside to the device.
Input terminal (10B) and an analog second video signal
Input terminal for inputting (Video A) from outside into the device
(10A) and the first video signal corresponding to the first video signal.
For inputting the synchronization signal (synchronization B) from outside to the device
Input terminal (40B) and a second terminal corresponding to the second video signal.
2 to input the synchronization signal (synchronization A) from the outside to the device.
Input terminal (40A) and the expansion control signal (enlargement X)
Input terminal (30X) for external input into the device
Input a display control signal (control W) from the outside into the device.
Input terminal (30W) for input to the device
The first and second synchronization signals are input, and one of the
Synchronization switching means (6) for selecting and outputting an analog first video signal inputted to the apparatus.
Digital first video signal which is converted into a first video signal and outputted.
Analog / digital conversion means (21B);
Digital output from analog / digital conversion means
The first video signal is written in, after being stored, read
First memory means (22B) to be issued and the first memo
Digital first video signal read by the
The first data that is converted into an analog first video signal and output.
Digital / analog conversion means (23B);
Writing digital first video signal to memory means
In synchronization with the first synchronization signal input into the device.
A first writing control means (24B) for controlling
Reading digital first video signal from memory means
In synchronization with the synchronization signal output from the synchronization switching means.
First reading control means (26B) for controlling
Based on the enlargement control signal input to the first
A first control for controlling the read control means and the first read control means.
Enlargement control means (25B) and the analog second video signal input into the device
A second video signal which is converted into a digital second video signal and outputted.
Analog / digital conversion means (21A);
Digital output from analog / digital conversion means
After the second video signal is written and stored
Second memory means (22A) to be output and the second memo
The digital second video signal read by the
The second data that is converted into an analog second video signal and output.
Digital / analog conversion means (23A);
Writing a digital second video signal to the memory means
In synchronization with the second synchronization signal input into the device.
A second writing control means (24A) for controlling
Reading digital second video signal from memory means
In synchronization with the synchronization signal output from the synchronization switching means.
Reading control means (26A) for controlling by
Based on the enlargement control signal input to the second
A second control unit for controlling the read control unit and the second read control unit.
Output from the enlargement control means (25A) and the first digital / analog conversion means;
Analog first video signal and the second digital /
Analog second video output from analog conversion means
Signal and output one video signal as it is
Alternatively, a screen combining device that combines and outputs both video signals
Step (5), based on the display control signal input into the device.
Display control means (4) for controlling the screen synthesizing means
And an analog video signal output from the screen combining means.
And Film image processing means for outputting by performing image processing (7) in JP,
Based on the analog video signal output from the video processing means.
An analog display (8) for displaying an image based on the
And at least the first analog / data
Digital conversion means, first memory means, first digital means
/ Analog conversion means, first writing control means, first reading
Output control means and first enlargement control means,
A second analog / digital device disposed in a large circuit board;
Digital conversion means, second memory means, second digital /
Analog conversion means, second write control means, second read control
Control means and second enlargement control means, the second enlargement control means
Video display device characterized by being arranged in a circuit board
Place. 18. (n-1) [n is a natural number of 2 or more] pieces
(N-1) substrates,
Insert (n-1) enlarged circuit boards from insertion slot
A video display device comprising: n analog video images;
N input terminals for inputting signals into the device from outside
And n synchronization signals respectively corresponding to the n video signals.
N input terminals for inputting signals into the device from outside
And an input to input the enlargement control signal from outside into the device.
Input terminal and display control signal from outside
Input terminal, and n synchronous signals input into the device.
Signal, and select and output one of the synchronization signals
A synchronous switching means, and a pair of (n-1) enlarged circuit boards, one for one
In response, the n analog video signals input into the device
(N-1) analog video signals
Is converted to a digital video signal and output (n-1)
Analog / digital conversion means and (n-1)
(N-
1) Each of the analog / digital conversion means
The output (n-1) digital video signals are written
Are stored, stored, and then read out.
Memory means and (n-1) said enlarged circuit boards
Each one-to-one corresponds to one of the (n-1) memory means.
Read (n-1) digital video signals
Each is converted into an analog video signal and output (n-
1) digital / analog conversion means, and (n-1)
(N)
(N) number of the above-mentioned memories to -1) number of the above-mentioned memory means.
The digital video signal is written by n
(N-1) of the video signals among the synchronization signals
Are synchronized with the (n-1) synchronization signals respectively corresponding to
(N-1) write control means for controlling
Each of the (n-1) enlarged circuit boards has a one-to-one correspondence.
(N-1) from the (n-1) memory means
Reading of the digital video signals
In synchronization with the synchronization signal output from the switching means,
(N-1) read control means to be controlled and (n-1) read control means
The above-mentioned enlarged circuit boards correspond one-to-one with
(N-1) based on the enlargement control signal input to
Write control means and (n-1) read control means
And (n-1) pieces of the digital / analog conversion means,
(N-1) analog video signals output and inside the device
Of the n analog video signals input to
(N-1) analog / digital conversion means
The remaining one analog video signal that has not been converted
Input and output the desired one video signal as it is.
Or an image that combines and outputs two or more desired video signals.
Plane synthesizing means, and the display control signal input into the apparatus.
Display control means for controlling the screen synthesizing means based on the
The analog video signal output from the screen combining means
Video processing means for performing video processing and outputting the video processing;
Video based on the analog video signal output from the means
And an analog display for displaying
At least (n-1) analog / digital
Conversion means, (n-1) memory means, (n-1)
Digital / analog conversion means, (n-1) write control
Control means, (n-1) read control means, and (n-1)
Number of expansion control means are respectively corresponding to (n-1)
Characterized in that it is arranged in an enlarged circuit board of
Image display device. 19. Inserting n (n is a natural number of 2 or more) substrates
In the main body having an inlet, n pieces of the substrate
This is a video display device in which an enlarged circuit board is inserted.
Therefore, n analog video signals are externally input into the device.
N input terminals for inputting and n video signals
The corresponding n synchronization signals are input into the device from outside.
N input terminals for inputting signals and external control signals
Input terminal for input into the device and display control signal.
An input terminal for external input into the device and a
The input n synchronization signals are input, and any one of the
A synchronous switching means for selecting and outputting a synchronization signal, respectively in one-to-one correspondence to the n the larger circuit board, instrumentation
The n analog video signals input into the
Each of the n pieces of digital video signals that are converted to digital video signals and output.
Analog / digital conversion means;
Each of the boards corresponds to one of the n analog / digital
N digital data output from the digital conversion means respectively
After the video signal is written and stored,
N memory means to be used and n
Each one-to-one correspondence, read from the n memory means
Analyze each of the n digital video signals
N digital / A converters that convert to digital video signals and output
Analog conversion means, and n
Corresponding one-to-one, n to the n memory means
Write digital video signals
Out of the n synchronization signals, n
Each of them is controlled in synchronization with the corresponding n synchronization signals.
N writing control means for controlling, and n said enlarged circuit boards
, Respectively, and corresponds to
Reading of the n digital video signals of
In synchronization with the synchronization signal output from the synchronization switching means,
N read control means for controlling each of them, and n
One-to-one correspondence with each circuit board and input into the device
Based on the enlargement control signal, the n write control means and
And n expansions respectively controlling the n read control means
Control means; output from the n digital / analog conversion means
Input n analog video signals, and
The image signal is output as it is or two or more desired
Screen synthesizing means for synthesizing and outputting video signals, and
The screen synthesizing method is performed based on the input display control signal.
Display control means for controlling the steps and output from the screen synthesizing means.
Apply video processing to the output analog video signal and output
Video processing means, and an analog output from the video processing means.
Analog display that displays video based on the video signal of the log
And at least n of the above
Analog / digital conversion means, n memory means, n
Digital / analog conversion means, n write control means
Stage, n read control means and n enlargement control means,
Each of which is located in the corresponding n enlarged circuit boards
A video display device. 20. Any one of claims 1 to 19
In the video display device described in, the synchronization signal is generated and output.
Synchronization generating means for inputting the same
Of the synchronization signal,
Using a synchronization signal output from the raw means.
Video display device. 21. Any one of claims 1 to 8
In the video display device described in the above, the display is provided with an
From a analog or digital display
An image display device, comprising: 22. Any one of claims 1 to 21
From one or more signal sources using one video display device
Switching or compositing images on the same screen
Characteristic screen display system. 23. Any one of claims 1 to 21
Using multiple video display devices described in, and multiple signal sources
These images are displayed on each image display device in a multi-screen display or composite table.
A multi-screen display system characterized by showing.