JP2001128089A - Picture synthesizer for multi-screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately display a slave picture to be synthesized to a master picture though the resolution of the input video signal of the master picture to each screen of a multi-screen picture is different. SOLUTION: Each screen S1 to S4 of a multi-screen picture 17 is provided with a picture synthesis controlling circuit part 1, and the resolution of the video signal A1 of a master picture from an input terminal 2a is converted by a resolution conversion circuit 3 to equalize the resolution of the video signal of the master picture at all the parts 1. A video signal B1 of a slave picture from the terminal 2a is scaled by using a memory 11, etc., and becomes the signal of a timing corresponding to the fitting position of the master picture by a control signal D1 from a slave picture position controller 16. The video signal A4 of the processed master picture and the video signal B4 of the slave picture are switched and synthesized with a switch control signal D2 generated by a switch control signal generation circuit 15 from the signal D1 by a picture synthesizing circuit 14 to obtain the display signal of the screen S1, e.g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite display of a small screen in a multi-screen display device in which one large screen (hereinafter, referred to as a multi-screen screen) is composed of a plurality of screens (display screens by a display). In particular,
In such a multi-screen display device capable of displaying an image of a video signal having a different resolution for each display,
The present invention relates to a screen synthesizing processing device capable of synthesizing (ie, synthesizing) sub-screens on the multi-screen screen.

[0002]

2. Description of the Related Art In a display device composed of a single display (single screen) such as a monitor of a television image or a computer image, as a screen synthesizing device for synthesizing and displaying a small screen on the display screen, for example, FIG. 1
1 is known.

In FIG. 1, a video signal of a main screen input from an input terminal 100a is supplied to a synchronization separation circuit 102, where the synchronization signal is separated and the signal processing circuit 1
01, and the luminance / color adjustment and output level adjustment are performed, and then supplied to the synthesizing circuit 107.

On the other hand, a video signal of a small picture input from an input terminal 100b is converted into a digital video signal by an AD converter 103, and then temporarily written into a memory 104 under the control of a memory control circuit 105, and is then synchronized. Separation circuit 1
It is read out at the timing of the synchronization signal of the video signal of the main screen separated at 02. In this case, the digital video signal of the small screen is read from the memory 104 such that the small screen is reduced or only a part of the small screen is read. The digital video signal of the child screen read from the memory 104 is synchronized with the video signal of the main screen, is converted into an analog video signal by the DA converter 106, and is supplied to the synthesizing circuit 107.

The synthesizing circuit 107 is composed of an analog switcher or the like, and is normally supplied to the monitor 108 through the video signal of the main screen from the signal processing circuit 101. In the period corresponding to the position where the sub-screen is fitted on the main screen, The video signal of the small screen from the DA converter 106 is selected and supplied to the monitor 108. In this way, the child screen is combined with the parent screen and displayed on the display screen of the monitor 108.

Conventionally, there has been known a multi-screen display device in which a plurality of screens (displays) are combined to form one large screen, that is, a multi-screen, thereby displaying a large screen. A screen of a video signal different for each screen can be simultaneously displayed. However, in such a multi-screen display device, there is a problem that the seam between the screens is thick and conspicuous, and there is little need for a screen composite display in such a multi-screen display device.

However, recently, due to technological innovation, the seams between screens can be made so narrow that they are almost inconspicuous. Therefore, there has been a demand for performing a screen composite display at a desired place on a multi-screen screen. Was. Therefore, as the conventional screen composition of the multi-screen display device, the screen composition of the method performed in the television device or the like described with reference to FIG. After that, the obtained composite video signal is enlarged by an enlargement processing device, and then the enlarged video signal is distributed to each screen to perform multi-screen display.

Such a multi-screen display device is particularly applicable to a system such as a conference / lecture system that often uses screen synthesis such as a mouse cursor or handwriting input, and provides various presentations with the multi-screen display device. It is.

[0009]

However, as described above, in the case where the image is synthesized and then enlarged and displayed on a multi-screen screen, in order to synthesize the screen, one parent screen is enlarged and displayed on the entire multi-screen screen. In other words, if such a method is adopted as screen composition, when performing screen display of a video signal different for each screen constituting the multi-screen screen, which is a feature of multi-screen display, the screen composition is There was a problem that it was not possible. Furthermore, the resolution of the image of the child screen to be fitted is often lower than the resolution of the parent screen. In such a case, however, there is a problem that the roughness of the pixels of the child screen fitted by the enlargement process is conspicuous.

As a method for solving the above problems, an image processing device is provided for each screen constituting a multi-screen screen, and when there is one main screen, the video signal of this main screen is distributed to each screen. In the case of displaying an image of a video signal different for each screen as a main screen, each video signal is supplied to the corresponding image processing apparatus, and supplied to the main screen. A method of synthesizing the sub-screens by using an image processing device for each screen can be considered.

According to this method, when one parent screen is enlarged and displayed on the entire screen, the video signal of this parent screen is enlarged and divided for each screen, and the enlargement processing is performed in each image processing apparatus. The video signal of the child screen is inserted into the video signal of the main screen. Further, even when an image of a video signal different for each screen is displayed as a parent screen, an arbitrary video signal can be input to the image processing device of each screen by performing screen synthesis by the image processing device for each screen. . In addition, it is possible to use the resolution of the small screen corresponding to the number of screen surfaces, and it is also possible to suppress the pixel roughness of the display screen due to the low resolution of the small screen.

However, in such a multi-screen display, when an image of a video signal different for each screen can be displayed as a main screen, when the resolution of the video signal of the main screen for each screen is made different from each other, the multi-screen display is also used. Screen display is possible. When the sub-screens are combined and displayed on the parent screen displayed in this way, the following problems occur in the sub-screens that are composited and displayed, because the resolutions of the parent screens are different for each screen. Note that the resolution here is the number of effective pixels in one horizontal scanning line (line), and the vertical resolution of the screen is the number of effective scanning lines in one screen.

FIG. 12 shows a multi-screen screen of four screens, two screens each vertically and horizontally, wherein the respective screens are S ₁ , S ₂ , S ₃ and S _4, and these four screens S ₁ child screen P across to S ₄ are assumed to be synthesized. The resolution of the parent screen and the child screen P displayed on these screens S _{1 to} S ₄ is expressed as horizontal resolution × vertical resolution. Screen S ₁ : 1024 × 768 screen S ₂ : 800 × 600 screen S ₃ : 1280 × 1024 screen S ₄ : 640 × 480 Sub-screen P: 320 × 240.

In FIG. 12, for convenience of description, it is assumed that the sub-screen P is now fitted to the main screen such that the center of the sub-screen P coincides with the center 0 of the multi-screen screen. Then, a part of the child screen P in the screen S ₁ say of Molecular screen P _1, below, the screen S _2, S _3, S ₄ of Molecular part of the child screen P in the screen P _2, P _3, P _Four .
In this case, the number of effective pixels in each of the horizontal and vertical directions on each of the screens S _{1 to} S ₄ is 解像度 of its resolution, and is therefore 160 × 120.

Therefore, assuming now that the horizontal dimension of each of the screens S _{1 to} S ₄ is d _H and the vertical dimension is d _V , each of the partial screens P ₁ , P ₂ , P ₃ , P ₄ Since the pixel array is aligned with the corresponding pixel array of the main screen on the screens S ₁ , S ₂ , S ₃ , and S ₄ , the horizontal and vertical dimensions of the partial molecular screen P ₁ are the horizontal dimensions = a _{d H · 160/1024 = 0.156d} H vertical dimension _{= d V · 120/768 = 0.156d V} . Looking at the other child screens, P ₃ and P ₄ , P ₂ : horizontal dimension = 0.2 d _H vertical dimension = 0.2 d _V P ₃ : horizontal dimension = 0.125 d _H vertical dimension = 0.117 d _V P _4: the horizontal dimension = 0.25d _H vertical dimension = 0.25d _V, and the magnitude of of Molecular screen P ₁ to P ₄ will be different for each screen S ₁ to S _4. Therefore, the child screen P
Are displayed on a multi-screen screen in which the main screen is displayed at different resolutions for each screen, and when this sub-screen P is displayed over a plurality of screens, the sub-screens displayed for each screen are displayed. The size of the image will be different.

As shown in FIG. 13, a pointer image p is synthesized and displayed on a multi-screen screen similar to that shown in FIG.
Screen S even an attempt is made to move from _one to the screen S ₄ through the screen S ₂ or S ₃ at a constant speed, since the interval on the screen of each pixel in each of the screen S ₁ to S ₄ are different, respectively The moving speed of the pointer p differs between the screens S _{1 to} S ₄ .

To solve such a problem, for example, in FIG.
By adjusting according to the resolution of the video signal of the main screen in ₁ , S ₂ , S ₃ , S ₄ , these screens S ₁ , S ₂ ,
It is conceivable that the sizes of the partial molecule screens P ₁ , P ₂ , P ₃ , and P ₄ in S ₃ and S ₄ are made to match each other. In this case, as shown in FIG. When the screen P is displayed over the screens S ₁ , S ₂ , S ₃ , and S ₄ , as shown in FIG. 14, the screens P ₁ , S ₂ , S ₃ , and S ₄ are used. Section molecular screens P ₁ , P ₂ ,
Since the resolution is different for each of P ₃ and P ₄ (the difference in the hatching of the partial molecular screens P ₁ , P ₂ , P ₃ , and P ₄ indicates the difference in the resolution of these partial molecular screens). The image quality of the child screen P is significantly deteriorated.

[0018] When displaying the sub-screen P as shown in FIG. 14, when to move the display position of the child screen P, also controls the amount of movement, as shown in FIG. 15, the screen S ₁ ~ It will be different for each S _4. That is, in FIG. 15, a screen S _1, for example, assuming that the moving N steps, in order to equal the distance moved the same This other screen S ₂ to S ₄ is a screen S ₂ (80
0/1024) × N steps, the screen S ₃ (1280/1024) ×
N steps, the amount of movement of the screen S ₄ (640/1024) × N steps are required, it is necessary to control the movement amount for each screen S ₁ to S _4. Further, also in the position control, since the movement amount in each of the screens S _{1 to} S ₄ can be set only in pixel units, the movement amount does not often become an integral amount of the pixel interval depending on the resolution (for example, the screen S _{In the} case of moving by (800/1024) × N steps in ₂ , if N is not an integral multiple of 32, the moving amount of (800/1024) × N steps is not an integral multiple of the pixel interval.
As indicated by the circle 6 in FIG. 6, positional deviations of the partial molecular screens P ₁ , P ₂ , P ₃ , and P ₄ occur between the screens S _{1 to} S ₄ , and it is difficult to perfectly match them. Met.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a sub-screen in which a different video signal is displayed for each screen as a main screen on a multi-screen screen. To prevent image degradation
Another object of the present invention is to provide a screen composition processing apparatus capable of easily displaying the child screen in a normal state.

[0020]

In order to achieve the above-mentioned object, the present invention provides, for example, a case where the resolution of an input video signal of a main screen inputted to each of screens forming a multi-screen screen is at least two or more. In addition, a main screen of a different video signal can be displayed for each screen, and, together with this, a sub-screen can also be displayed in combination with the main screen of the multi-screen screen, and the resolution of the main screen can be displayed. Are all substantially equal. According to this configuration, by synchronizing the video signal of the sub-screen with the video signal of the main screen, the sub-screen is displayed on any screen of the multi-screen screen regardless of the display position on the multi-screen screen. However, the display mode is almost the same, and almost appropriate display is performed regardless of the display position on the multi-screen screen.

Further, the present invention uses a small-screen position control device so that a fitting position of a small screen can be designated by a position on a multi-screen screen. This child screen position control device
A coordinate system is set for each of the multi-screen screens and a plurality of screens forming the multi-screen screen, and the position information of the display area of the child screen specified on the coordinate system of the multi-screen screen is coordinate-transformed to the coordinate system of each screen. As a result, the display area of the child screen is allocated to a position on each screen. A screen synthesizing circuit for synthesizing a main screen and a portion displayed on the corresponding screen of the child screen is controlled in accordance with the position allocated on the screen. As a result, the user can specify the display position of the child screen on the multi-screen screen without considering the position on the screen, which facilitates the specification of the display position of the child screen.

As described above, according to the present invention, since the resolution of the parent screen of each screen is unified, even if the child screen is displayed on a single screen, the screen is synthesized on a single screen. Screen composite display without discomfort, and the unique position of the child screen can be uniquely assigned in spite of multi-screen display. Position control of the child screen is facilitated.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a screen synthesis processing device of a multi-screen display device according to the present invention, wherein 1a to 1d denote a screen synthesis control circuit unit,
2a is an input terminal of a video signal of a main screen, 2b is an input terminal of a video signal of a sub-screen, 3 is a resolution conversion circuit, 4 is an AD converter, 5 is a memory, 6 is a DA converter, 7 is a sync separation circuit, 8 is Signal processing circuit, 9 is an output synchronizing signal generation circuit, 10 is an AD converter, 11 is a memory, 12 is a memory control circuit, 13 is a DA converter, 14 is a screen synthesis circuit, 15 is a switching control signal generation circuit, and 16 is a small screen The position control device 17 is a multi-screen screen, and S _{1 to} S ₄ are screens.

In the following description, in the following description, the multi-screen screen 17 is composed of four vertical and horizontal 2 × 2 screens S.
₁ , S ₂ , S ₃ and S ₄ . The screen synthesizing control circuit unit 1 is provided for each of these screens S ₁ , S ₂ , S ₃ and S _4.
Although a~1d is provided, wherein the screen combining control circuit portion 1a shown in the drawing is for the screen S _1, the screen to the screen S ₂ to S ₄ combining control circuit unit 1
Details of b to 1d are omitted. However, these screens combining control circuit unit 1a~1d to the screen S ₁ to S ₄ forms a same configuration, which forms substantially the same operation, therefore, describes an image combining control circuit 1a to the screen 1a.

Each of the screen synthesis control circuit sections 1a to 1d includes a main screen processing section including a resolution conversion circuit 3, a small screen processing section including an AD converter 10, a memory 11, a memory control circuit 12, and a DA converter 13. It comprises a screen synthesizing unit for a main screen and a child screen, which is composed of a synthesizing circuit 14 and a switching control signal generating circuit 15.

First, the main screen processing section will be described.
An analog video signal A _{1 of a main} screen for the screen S ₁ of the multi-screen screen 17 is input from the input terminal 2 a and supplied to the resolution conversion circuit 3. In the resolution conversion circuit 3, an analog video signal A ₁ which is the supply,
The synchronization signal C ₁ is supplied to the synchronization separation circuit 7 to be separated, and is also supplied to the AD converter 4 to be converted into a digital video signal A ₂ and stored in the memory 5. This AD
Sampling for A / D conversion in the converter 4 is as follows.
This is performed by the sampling clock generated from the synchronization signal C ₁ separated by the synchronization separation circuit 7, and writing in the memory 5 is used by the AD converter 4 and the synchronization signal C ₁ separated by the synchronization separation circuit 7. This is performed using a clock synchronized with the sampling clock. The digital video signal A ₂ stored in the memory 5 is read out to the signal processing circuit 8, and pixel interpolation, enlargement / reduction, frame frequency conversion, etc. are performed using a clock synchronized with the synchronization signal C ₁ from the synchronization separation circuit 7. Is performed.

[0027] The signal processing circuit 8 is to convert the input video signal A ₁ resolution, the resolution conversion (adding pixel number) expanding the digital image signal A _2, carried out by the reduction (reduction in the number of pixels) At this time, image quality is improved by performing pixel interpolation processing and the like. For example, to increase the horizontal resolution from 1024 to 1280,
One pixel is added for every four pixels to a screen of 1024. By performing an interpolation process such as linear interpolation or non-linear interpolation (interpolation in which five pixels are evenly arranged in a four-pixel period), the image quality is improved. The horizontal resolution can be increased without deteriorating the horizontal resolution. Also, for example, if the horizontal resolution is 1024 to 80
When reducing to 0, 7 pixels are eliminated for every 32 pixels and 2
In this case, 25 pixels are evenly arranged in a 32 pixel period by using an interpolation process.

Further, the frame frequency conversion in the signal processing circuit 8, the memory 5 at the frame frequency synchronized to the synchronizing signal C ₂ of the digital video signal A ₂ which is resolution-converted from the output synchronizing signal generator 9 described above Is to be output. When the frame frequency conversion is not performed, the digital video signal A ₃ synchronized with the synchronization signal C ₁ separated by the synchronization separation circuit 7 is read from the memory 5.

The digital video signal A ₃ of the main screen processed by the signal processing circuit 8 and read from the memory 5 is converted into an analog video signal A ₄ by the DA converter 6 and then output from the resolution conversion circuit 3. Screen synthesis circuit 14 as signal
Supplied to

The above description is based on the multi-screen screen 17.
Is concerned with the resolution conversion circuit 3 to the screen S ₁ constituting the same is true for other screen S _2, S _3, the resolution conversion circuit 3 which is not shown for the S _4.

However, there are cases where analog video signals from different signal sources are supplied to the screen synthesizing control circuits 1a to 1d for the screens S ₁ , S ₂ , S ₃ and S _{4 respectively} . In multi-screen display systems used for lectures and lectures, video cameras and PC images with different resolutions are used as signal sources.
The resolutions of the video signals supplied from these signal sources may be different. However, in such a system, since the configuration is fixed, the relationship between the signal source and the screens S ₁ , S ₂ , S ₃ , and S ₄ is a one-to-one correspondence. Therefore, each screen S ₁ , S ₂ , S ₃ ,
Even though different resolution of the video signal of the input parent screen for the S _4, for the same screen, so that the main screen video signal of the same resolution is inputted.

Next, the sub-screen processing unit will be described.
If the screen synthesis, the input terminal 2b child analog video signal B ₁ of the screen is input, after being converted into a digital video signal B ₂ in the AD converter 10 (the sampling clock at this time, although not shown, the analog video Signal B ₁
Under the control of the memory control circuit 12 based on the synchronization signal separated from the analog video signal B ₁ and the clock synchronized with the sampling clock of the AD converter 10. 11 is stored in, also at the timing determined the position of the child screen on the screen S ₁ from the child screen position control device 16 in children that represent screen position control signal D _1, the control of the memory control circuit 12, among the sub-screen portion to be displayed in the screen S _1, i.e., of Molecular screen in the screen S ₁ is read out. The time of reading from the memory 11, as of Molecular screen corresponding to the screen S ₁ of the child screen is displayed in the region corresponding to the sub screen position control signal D ₁ of the on-screen S _1, scaled You. In this scaling, pixels are thinned out or added at a ratio corresponding to the enlargement ratio. (By this scaling, the time interval between the pixels of the digital video signal A ₃ of the main screen and the digital video signal B ₃ of the child screen is set. Are equal). Further, at the time of scaling, pixel interpolation using a filter such as linear or non-linear is performed, but the description is omitted here.

FIG. 2 is a diagram showing the writing timing of the sub-screen in the memory 11 and the reading timing of the sub-molecule screen in the future.

In the figure, the entire sub-picture P from the AD converter 10 (FIG. 1) is written in the memory 11. Now, fitting of When reading the of Molecular screen P ₁ of the child screen P with respect to the main screen of the screen S _1, to read timing of a parent screen from the memory 5 (FIG. 1), to the main screen of Molecular screen P ₁ from the memory 11 are read out at the timing shown in FIG. 2 according to the position. This fitting position is determined by the child screen position control device 16.
It is defined by the child screen position control signal D ₁ of the (FIG. 1).

Returning to FIG. 1, when the digital video signal A ₃ read from the memory 5 has undergone frame frequency conversion, the reading of the memory 11 is synchronized with the synchronizing signal C ₂ from the output synchronizing signal generating circuit 9. When the frame frequency conversion is not performed, the conversion is performed in synchronization with the synchronization signal C ₁ from the synchronization separation circuit 7. Thereby, the digital video signal A _{3 of the main} screen from the memory 5 and the memory 11
A digital video signal B ₃ as of Molecular screen of the screen S ₁ from would synchronized in units of pixels.
This digital video signal B ₃ is converted into an analog video signal B ₄ by a DA converter 13 and then converted to a screen synthesis circuit 14.
Supplied to

The switching control signal generation circuit 15 responds to the small screen position control signal D ₁ from the small screen position control device 16 by
Analog video signal B of the small screen from DA converter 13
Generating a switching control signal D ₂ which represents the signal period of _4. Screen synthesis circuit 14 is controlled by the switching control signal D ₂ is from an analog switcher, normally selects and outputs the analog video signal A ₄ parent screen from the DA converter 6, the switching control signal D ₂ When the switching is performed, the analog video signal B ₄ of the small screen from the DA converter 13 is selected and output. In this way, the screen synthesis circuit 14 outputs the screen composite video signal A ₅ in which the resolution-converted analog video signal A ₄ of the main screen is fitted with the video signal B ₄ of the child screen for the partial molecular screen of the screen S _1. Is obtained. This screen composite video signal A ₅ is used for screen display on the screen S ₁ of the multi-screen screen 17.

Hereinafter, similarly, the multi-screen screen 1
Other screen S ₂ of 7, S _3, even in the screen combining control circuit unit 1b~1d for S _4, a screen similar to the synthetic video signal is generated, using the screen display of each screen S _2, S _3, S ₄ Can be Note that these screens S ₂ , S ₃ , S
In the screen combining control circuit unit 1b~1d for _4, although the video signals of mutually different master screen is input, the video signal of the sub-screen input is the same as the video signal B ₁ of the child screen that is input to the input terminal 2b The screen synthesis control circuit units 1b to 1b
The portion to be displayed on the molecular screen of each of the screens S ₂ , S ₃ , and S ₄ is extracted from the memory 11 of 1d, and the resolution is converted in accordance with the display size (in some cases, the resolution is not converted).

FIG. 3 is a circuit diagram showing a specific example of the screen synthesizing circuit 14 in FIG. 1, wherein 14a and 14b are input terminals, 14c is an analog switcher, 14d is an AND gate, 14e and 14f are input terminals, 14g is an output terminal.

In the figure, an input terminal 14a has a DA
The analog video signal A ₄ of the parent screen whose resolution has been converted from the converter 6 (FIG. 1) is input, and the analog video signal B ₄ of the partial molecular screen from the DA converter 13 (FIG. 1) is input to the input terminal 14b. The input is supplied to the analog switcher 14c. The switching control signal D ₂ supplied from the switching control signal generating circuit 15 (FIG. 1) includes a horizontal switching control signal D _2H and a vertical switching control signal D _2V, which are respectively input from the input terminals 14 e and 14 f to the AND gate 14 d. Supplied.

[0040] The horizontal switch control signal D _2H is, there is to be repeatedly generated every horizontal scan of the parent screen of the screen S _1, to the screen S _1, as shown in FIG. 3,
When fitting the of Molecular screen P ₁ is set, the period "H" (high level) corresponding to each the horizontal scanning in the horizontal direction of the width of the area of the of Molecular screen P _1. The vertical switching control signal D _2V is repeatedly generated for each vertical scan of the main screen of the screen S _1.
1, as shown in FIG. 3, the fitting of the of Molecular screen P ₁ is set, the period "H" corresponding to each vertical scanning in the vertical direction of the width of the area of the of Molecular screen P _1.

[0041] Such the horizontal switching control signal D _2H vertical switching control signal D _2V is supplied to the AND gate 14d, from the AND gate 14d, the scanning position of the parent screen of Molecular screen P of the screen S _{1 The} switching control signal _D2HV which becomes "H" when it is within the area of ₁ is obtained. The switching control signal D _2HV controls the switching of the analog switcher 14c. When the switching control signal D _2HV is “L” (low level), the analog switcher 14c controls the video signal A of the main screen from the input terminal 14a. ₄ is selected, and when the switching control signal D _2HV is “H”, the video signal B ₄ of the _small picture from the input terminal 14b is selected. In this way, the analog scan Germany tea 14c, for example, a screen composed video signal A ₅ obtained to the screen S ₁ as shown in FIG. 3, the screen S ₁ is output from the output terminal 14g
Supplied to the display.

FIG. 5 is a diagram for explaining the operation of the main part of the first embodiment shown in FIG.
C and 3D are resolution conversion circuits, 14A, 14B and 14 respectively.
Reference numerals C and 14D denote screen compositing circuits, and portions corresponding to those in FIG.

[0043] In the figure, the resolution conversion circuit 3B and the screen synthesis circuit 14B, a combined screen of the of Molecular screen P ₂ of the main screen B and the child screen P displayed on the screen S ₂ in a multi-screen display 17 It constitutes a screen synthesis control circuit 1b (FIG. 1) for generating a video signal of the main screen B. Similarly, the resolution conversion circuit 3A
And the screen synthesizing circuit 14A, the multi-screen screen 17
Constitutes the screen combining control circuit section 1a for generating a composite screen with of Molecular screen P ₁ of the parent screen A and the child screen P to be displayed on the screen S ₁ at, a video signal of the parent screen A The resolution conversion circuit 3C and the screen synthesis circuit 14
C is the screen S ₃ on the multi-screen screen 17
Displayed on constitutes the screen combining control circuit unit 1c for generating a composite screen with of Molecular screen P ₃ of the main screen C and the child screen P, the video signal of the main screen C is inputted, the resolution conversion the circuit 3D and the screen synthesis circuit 14D, a parent screen D to be displayed on the screen S ₄ of the multi-screen display 17
And constitutes the screen combining control circuit unit 1d for generating a composite screen with of Molecular screen P ₄ of the child screen P, the video signal of the main screen D is input. That is, the resolution conversion circuits 3A, 3B, 3C, and 3D output the multi-screen screen 17
₄ corresponding to the screens S ₁ , S ₂ , S ₃ , S ₄ of FIG.
4B, 14C, and 14D also correspond to the screen composition circuit 14 shown in FIG.

The video signals of the main screens A, B, C and D are respectively
After the resolution conversion by the resolution conversion circuits 3A, 3B, 3C, 3D, the screen synthesis circuits 14A, 14B, 14C, 14D
Are supplied to the screen synthesizing circuits 14A, 14B, 14
C, and each 14D, in response to the switching control signal D ₂ from the switching control signal generating circuit 15, the screen combining control circuit unit 1a, 1
b, 1c, 1d Scaling section molecular screens P ₁ , P ₂ , P ₃ , P ₄ supplied from the respective DA converters 13 (FIG. 1).
(Note that FIG. 5 shows the same child screen P as if it were supplied to the screen combining circuits 14A, 14B, 14C, and 14D. 14A, 14B, 14C, and 14D respectively
D of different screen composition control circuit units 1a, 1b, 1c, 1d
This is a collective illustration showing that the partial molecule screen is supplied from the A converter 13. Further, the same applies to the switching control signal D _2, the screen synthesis circuit 14A, 14B, 14
C, different switching control signal D ₂ is fed to 14D).
The screen composite video signals A _5A , A _5B , A _5C , and A _5D output from the screen compositing circuits 14A, 14B, 14C, and 14D are the respective screens S ₁ ,
Is supplied to the S _2, the display of S _3, S _4, by contrast, in the multi-screen display 17, the main screen A and of Molecular picture composing screen and P ₁ is displayed on the screen S _1, below, to the screen S ₂ parent screen B and of Molecular screens combined screen and P ₂ are combined screen of the main screen C and of Molecular screen P ₃ on the screen S ₃ is the parent screen D and of Molecular screen P ₄ on the screen S ₄
Are displayed respectively.

Here, the resolutions of the video signals of the input main screens A to D are different from each other, and the resolution of the input main screen A: 1024 × 768 The resolution of the input main screen B: 800 × 600 The resolution of the input main screen C : 1280 × 1024 Assuming that the resolution of the input main screen D is 640 × 480, the screens S ₁ , S ₂ , S _{3 of the} multi-screen screen 17 are maintained while maintaining the resolution of the main screens A, B, C, D. , S ₄ ,
The problem described above with reference to FIGS.

Therefore, in the first embodiment, the resolutions of the parent screens A, B, C, and D are all equal, and therefore, the video signals of the parent screens A, B, C, and D are respectively set. The resolution conversion is performed by the resolution conversion circuits 3A, 3B, 3C, and 3D. When the resolutions of the main screens A, B, C, and D are all equal, it is possible to match the resolutions to a certain resolution different from these resolutions. However, another resolution is adjusted to one of these resolutions. You may do so. For example, assuming that the resolution of the input parent images B (low-resolution video) is equal to the resolution of the input parent images A, B, C, and D, respectively, In this case, the resolution conversion circuit 3 reduces the resolution (performs image reduction processing) and increases the resolution (image enlargement processing) of the video signal of the input parent image D.
A, 3C, and 3D. However, since reducing an image is a process of thinning out pixels, video data is lost, and image quality is severely degraded. In order to prevent this, the video signal whose resolution is to be converted may be converted so as to increase the resolution (enlarge the image). In the above example, the resolution of the video signals of the remaining parent screens A, B, and D is made to match the resolution of the video signal of the input parent screen C having the highest resolution.
Also, the resolution may be adjusted to a higher resolution than any of the parent screens so that all the parent screens are enlarged.

When resolution conversion is performed, missing image data or data that does not exist originally are added by interpolation processing, so that the image quality deteriorates. For this reason, it is conceivable that the resolution conversion is performed in accordance with a signal having many video signals of the same resolution among the signals of the input main screen, and the number of video signals of the main screen to be subjected to the resolution conversion processing is reduced. For example, if the resolution of the input main screen A is 1024 × 768, the resolution of the input main screen B is 1024 × 768, the resolution of the input main screen C is 1280 × 1024, and the resolution of the input main screen D is 640 × 480, the input main screen C is , D video signal resolution is 1
By setting it to 024 × 768, it is not necessary to convert the resolution of the video signals of the input main screens A and B, which is compared with the case of matching the resolution of the video signal of the input main screen C having the highest resolution. However, the number of screens not subjected to the resolution conversion process increases.

In this embodiment (including the embodiment to be described later), the multi-screen screen is composed of four screens. However, the multi-screen screen is composed of a number of screens other than four, such as nine of 3 × 3. Although the present invention can be applied to a display device, as the number of screens increases, the number of video signals having the same resolution used as a parent screen increases, and this method is suitable for such a case.

Further, the resolution of the video signal of the main screen may be adjusted to the resolution of the video signal of the child screen P. In this case, a plurality of child screens P can be simultaneously synthesized and displayed on the same multi-screen screen 17, but in such a case, by matching the resolution of the video signal of the child screen with the highest resolution, The image quality of the screen can also be improved.

In the above description, the screens S ₁ , S ₂ , S
The relationship between ₃ , ₄ and the resolution of the main screen is a one-to-one correspondence, and it is assumed that video signals of the main screen having the same resolution are input to the same screen. In this case, In the resolution conversion circuit 3 to which the video signal of the main screen which does not require the resolution conversion described above is supplied,
The resolution conversion processing by the signal processing circuit 8 (FIG. 1) becomes unnecessary. However, even in such a resolution conversion circuit 3,
As will be described later, the same parent screen is displayed on the multi-screen screen 17.
An A / D converter 4, a memory 5, and a D / A converter 6 are provided because they are necessary for displaying the entire image.

Next, the child screen position control device 1 shown in FIG.
6 will be described.

The sub-screen position control device 16 is composed of a microcomputer or a position control circuit. The sub-screen position control device 16 fetches position information specified by a user or the like of the sub-screen P on the multi-screen screen 17, determines its position, and determines the position. Screens S ₁ , S ₂ , S ₃ , S _{4 at} 17
The position of the partial molecule screen is determined every time. That is, the position of the child screen P is managed for the entire multi-screen screen.

As for the display position of the sub-screen P on the multi-screen screen 17, the four screens S ₁ , S ₂ , S ₃ and S ₄ constituting the multi-screen screen 17 are shown in FIG. As shown in a) to (i), there are nine positions. In this embodiment, in each case, the display position of the child screen P is specified by a coordinate position on the multi-screen screen 17 (this coordinate is hereinafter referred to as a universal coordinate), and the specified position is also set. Information is
As shown in FIG. 6A, the position coordinates α of the upper left corner of the child screen P (hereinafter, referred to as the start position coordinates of the child screen P) and the position coordinates β of the lower right corner (hereinafter, the child screen P, (Referred to as P end position coordinates). The position coordinates α and β determine the fitting area of the square or rectangular child screen P on the main screen.

The area of the child screen P is on one screen as shown in FIGS. 6A to 6D on the multi-screen screen 17, or is shown in FIGS. 6E to 6I. As described above, the image may extend over a plurality of screens, and this can be easily determined from the position coordinates α and β. Whether the area of the child screen P exists only in one screen or extends over a plurality of screens, all or part of the child screen P (partial molecule screen)
Is converted from the universal coordinate system to the coordinate system of the screen for all or a part of the sub-screen displayed on each screen to be displayed.

Here, this coordinate transformation will be described with reference to FIGS. 7 and 8, taking FIG. 6 (i) as an example.

In FIG. 7, four screens S ₁ ,
The universal coordinate system on the multi-screen screen 17 composed of S ₂ , S ₃ , and S ₄
The origin is 0 at the upper left corner of the drawing, and the horizontal direction on the drawing is the X-axis coordinate,
The vertical direction is defined as the Y-axis coordinate. The horizontal length (hereinafter, referred to as a pixel unit) of these screens S ₁ , S ₂ , S ₃ , S ₄ is H, and the vertical length is V, and the X-axis coordinate is a value of 0 to 2H. , And the Y-axis coordinate takes a value of 0 to 2V.

On the multi-screen screen 17, it is assumed that a child screen P spanning the screens S ₁ , S ₂ , S ₃ , S ₄ is designated, and the starting position coordinates of the child screen P in the universal coordinate system at this time are α ( _Xα , _Yα ), and the end position coordinates are β ( _Xβ , _Yβ ). From such designated-position information, by an _{X α <H, Y α <} V, the starting position coordinates α _(X α, Y α) is in the region of the screen S _{1, also, H <X β <2H V} < Y _beta <since it is 2V, the end position coordinates β _(X β, Y β) is determined to be in the region of the screen S _4.

[0058] area included in the screen S ₁ of the sub-screen P, as shown in FIG. 8 (a), the screen S ₁
Which is of of Molecular screen P _1. Similarly, areas included in the screen S ₂ of the child screen P, as shown in FIG. 8 (b), a of Molecular screen P ₂ of the screen S _2, contained in the screen S ₃ of the child screen P region, as shown in FIG. 8 (c), a of Molecular screen P ₃ of the screen S _3, areas included in the screen S ₄ of the child screen P is 8
As shown in (d), this is the partial molecule screen P ₄ of this screen S ₄ . The sub-screen position control device 16 controls these partial molecular screens P ₁ , P ₂ , P ₃ ,
Screen S ₁ of the P ₄ respectively, S _2, S _3, it is to coordinate transformation to the coordinate system of the S _4.

[0059] Therefore, now, looking at the screen S _1, the coordinate system of the screen S ₁ is the upper left corner as the origin 0, the drawing on the horizontal x-axis direction, the vertical direction y
It has the same unit length as the universal coordinate system shown in FIG. 7, but takes a value of 0 to H in the x-axis direction and takes a value of 0 to V in the y-axis direction. . Therefore,
Assuming that the start coordinate position of the upper left corner of the partial molecule screen P ₁ in the coordinate system of the screen S ₁ is α ₁ (x, y) and the end coordinate position of the lower right corner is β ₁ (x, y), the start coordinate position is α ₁ (x, y)
Is the coordinate system of the screen S _1, is _{x = X α y = Y α} . The end coordinate position β ₁ (x, y) is x = H y = V in the coordinate system of the screen S ₁ . Here, since the values H and V are known, the child screen P
The given starting position of the multi-screen display 17 coordinates X _alpha, from Y _alpha, of Molecular screen P ₁ of the on screen S ₁
, The start coordinate (x, y) and the end coordinate position (x, y) can be obtained. These start position coordinates (x, y), end coordinate position (x, y) based on the switching control signal generating circuit 15 (FIGS. 1 and 4) creates a switching control signal to the screen S _1.

The same applies to the screens S ₂ , S ₃ , and S _{4. In} the screen S ₂ , the start coordinate position α ₂ (x, y) of the partial molecule screen P ₂ in FIG. _, x = 0 y = Y α end coordinate position β ₂ (x, y) is _{x = X α -H y = V} , the screen S _3, in FIG. 8 (c), the the of Molecular screen P ₃ start coordinate position α ₃ (x, y) _is, x = X α y = 0 end coordinate position β ₃ (x, y) is _{x = H y = Y α -V} , the screen S _4, FIG. 8 In (d), the start coordinate position α ₄ (x, y) of the partial molecule screen P ₄ is: x = 0 y = 0 The end coordinate position β ₄ (x, y) is: x = X _α −H y = Y _α− V.

As described above, the multi-screen screen 1
7. From the start coordinate position and end coordinate position of the child screen P specified by the user or the like in the universal coordinate system at 7, the partial molecule screens P ₁ , P ₂ , and P _{4 for} each of the screens S ₁ , S ₂ , S ₃ , and S ₄
The positions of P ₃ and P ₄ can be obtained, whereby the switching control signal generation circuit 15 (FIGS. 1 and 4) can use the screen S
_1, S _2, S _3, it is possible to create a switch control signal D ₂ of each S _4.

The same applies to the case where the child screen P is designated as shown in FIGS. 6A to 6H. FIG. 6 shows an example in which the child screen P is included in only one screen.
In the case of (a), the start position coordinate of the child screen P specified by the universal coordinate system of the multi-screen screen 17 is α ( _Xα , _Yα ), and the end position coordinate is β ( _Xβ , Y
_β ), in this case, _Xα , _Xβ <H, _Yα , _Yβ
<Since it is V, the child screen P is determined as being displayed only on the screen S _1, the start position coordinate of the child screen P of the screen S ₁ α (x, y) is, x = X _alpha y = Y _alpha, and the end position coordinates beta (x, y) becomes _{x = X β y = Y β} .

FIG. 6E shows an example in which the child screen P is included in only two screens.
If the start position coordinates of the child screen P specified in the universal coordinate system of the multi-screen screen 17 are α ( _Xα , _Yα ) and the end position coordinates are β ( _Xβ , _Yβ ), in this case, _{Xα <H, X β> H,} Y α since it is _<V, Y β> V, the child screen P is determined to be displayed in the screen S _1, S _2, sub-screen P of the screen S ₁ the start position coordinates α ₁ (x, y) is next to _{x = X α y = Y α} , end position coordinates β ₁ (x, y) _is, x = H y = Y β, and the screen S ₂ Α ₂ (x, y) is x = H y = Y _α , and β ₂ (x, y) is x = X _α −H y = Y _β Becomes

In this way, each screen S ₁ , S ₂ ,
Since the positions of the partial molecule screens P ₁ , P ₂ , P ₃ , and P ₄ in S ₃ and S ₄ are obtained by processing the position information of the multi-screen 14 at the universal coordinates, the multi-screen screen 17 is displayed. As a whole, the position of the child screen P can be managed as if it were a single screen. Accordingly, the position control of the child screen P from the outside can be performed in the same manner as the screen composition of the screen alone, and the control from the outside becomes easy. Here, the management of the position information of the child screen P on the multi-screen screen 17 is performed on all screens S _{1 to} S ₄
In addition to the above, the present invention may be applied to only _{one of} the entire screens S _{1 to} S ₄ that enables screen composition.

As described above, in the first and second embodiments,
Even if a different video signal is displayed for each of the screens S _{1 to} S _4, the same control as that of a single-sided screen can be performed externally, and the setting processing of the position and size of the child screen P can be simplified. . Also, in the image of the child screen P, since the resolution of the parent screen of each of the screens S _{1 to} S ₄ is equal, the image quality degradation due to the displacement of the child screen P between the screens S _{1 to} S ₄ and the difference in resolution is eliminated. A high-quality composite image can be displayed.

In the above embodiment, when the same parent screen is enlarged and displayed on the entire multi-screen screen 17, for example, in FIG.
Video signals of each screen S ₁ to S ₄ screen combining control circuit unit 1 to the same parent screen corresponding to each of 7 is input, the memory 5
Then, an area to be displayed on the corresponding screen is extracted and read, and an image is displayed on the corresponding screen using the video signal of the extracted area. The same applies to the embodiments described below.

FIG. 9 is a block diagram showing a second embodiment of the multi-screen screen synthesizing circuit according to the present invention. Reference numeral 18 denotes an embedded image signal generating circuit, and portions corresponding to those in FIG. And duplicate explanations are omitted.

In the same figure, the embedded image signal generation circuit 18
Is, for example, OSD (ON SCREEN
N DISPLAY) or an image signal E of an embedded image such as a mouse cursor. The generation timing of the embedding image signal E with respect to the video signal of the main screen is controlled by a sub-screen position control signal D ₁ from the sub-screen position control device 16.
The operation of the embedded image signal generation circuit 18 is synchronized with the synchronization separation circuit 7.
Is controlled by the synchronizing signal C ₁ from the output synchronizing signal generation circuit 9 or the synchronizing signal C ₂ from the output synchronizing signal generating circuit 9, so that the embedding image signal E to be output therefrom becomes the video signal A _{4 of the main} screen output from the DA converter 6. It is a signal synchronized with.
The embedding image signal E is supplied to the screen synthesizing circuit 14 and is controlled by the switching control signal D ₂ from the switching control signal generating circuit 15, thereby being synthesized with the video signal A _{4 of the main} screen from the DA converter 14. , screen combining video signal a ₅ to the screen S ₁ of the multi-screen display 17 can be obtained.

The resolution conversion circuit 3, the screen synthesis circuit 14, and the switching control signal generation circuit 1 of the screen synthesis control circuit sections 1a to 1d
5 and the sub-screen position control device 16 are the same as those in the embodiment shown in FIG. Further, the fitted image generation circuit 18 includes the screen synthesis control circuit sections 1a, 1b, 1c, 1
d, and each of the embedding image generation circuits 18 generates the same embedding image signal E. Screen synthesizing control for a screen on which a child screen is displayed based on the embedding image signal E is provided. Embedding image generation circuit 18 in circuit section
But the sub screen position control signal D _1, corresponding to the phase of the main screen image signal of the screen, is intended to occur. Thus, each of the screen _{S 1, S 2, S 3} , also the resolution of the main screen of the video signal picture composing the control circuit unit 1a~1d respectively input to S ₄ are different from each other, the multi-screen display 17 Screens S ₁ , S ₂ , S ₃ ,
Parent screen displayed on S ₄ is an intended resolution are equal to each other, images such as OSD or a mouse cursor by multi-screen display 17 according parent screen is displayed in the fitting image signal E is displayed in a combined Will be. For this reason, the display state of the same embedded image is the screen S ₁ ,
There is no difference for each of S ₂ , S ₃ , and S ₄ , so that the problem described above with reference to FIGS. 12 to 16 does not occur.

FIG. 10 is a block diagram showing a third embodiment of the multi-screen screen synthesizing apparatus according to the present invention, wherein 3 'is a resolution conversion circuit, 14' is a digital screen synthesizing circuit, and 19 is a DA converter. 1 are denoted by the same reference numerals, and redundant description will be omitted.

In the third embodiment, the screen composition of the parent screen and the child screen is performed by digital processing. Recently, the number of image processing apparatuses having a configuration of digital input and digital output is increasing, and it is essential to synthesize a screen by digital processing.

[0072] In FIG. 10, the resolution conversion circuit 3 'is being resolution conversion output digital video signal A ₃ main screen read out from the memory 5, the digital image synthesizing circuit 14' is supplied to the. The digital video signal B ₃ of the child screen read out from the memory 11 is also supplied to the digital image synthesizing circuit 14 '. Digital screen composition circuit 1
'In, is controlled by the switching control signal D _2, and the screen synthesized by switching between the digital video signal A ₃ and the digital video signal B _3, the digital picture composite video signal A ₅ of the' 4 and outputs a. The screen composite video signal A ₅ ′ is converted into an analog screen composite signal A ₅ by the DA converter 19, and is provided for the main screen display of the screen S ₁ of the multi-screen screen 17. The same applies to the screen combining control circuit unit 1b~1d to the screen _{S 2, S 3, S 4} .

The digital screen synthesizing circuit 14 'includes means for extracting special effects by performing arithmetic processing on the digital video signals A ₃ and B ₃ to be synthesized.

As described above, the third embodiment can provide the same effects as those of the embodiment shown in FIG. 1, but further, each of the screen synthesis control circuit sections 1a to 1d has a D
The number of A converters used can be reduced, and the configuration is simplified by that much, and the cost can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to only such embodiments.

For example, the input video signal A of the parent screen and the child screen
_1, when B ₁ is a digital video signal, it is possible to omit the AD converter 10 in the AD converter 4 and child screen processor in the processing unit of the main picture screen combining control circuit unit 1 b to 1 d.

In the second embodiment shown in FIG. 9, it is assumed that the embedding image signal generating circuit 18 generates a digital embedding image signal E, as in the third embodiment shown in FIG. , the digital screen synthesis circuit 14 fitting synthesizes the digital video signal a ₃ main screen from the image signal E and the resolution conversion circuit 3, whereby the resulting digital screen composite video signal of the analog by the DA converter it may be obtained a screen combining video signal a _5.

Further, the video signal input is expressed as only two systems. Naturally, in the present invention, it is possible to increase the number of circuits according to the number of screens of the multi-screen and the number of video inputs of the screen synthesizing unit, and there is no limitation on the number of screens or the number of inputs.

[0079]

As described above, according to the present invention,
When synthesizing a multi-screen screen composed of a combination of multiple screens, video signals with different resolutions are input for each screen, whereas the resolution of the parent screen displayed on each screen is unified, The size and position of the child screen between screens are uniquely determined,
External small-screen control can be performed without considering the relationship between screens.

In particular, in a conference system or a lecture system that requires a mouse pointer, handwriting input, or the like, the position control from the outside is easy, which is very effective.

Also, in the sub-screen display, since the resolutions of the parent screens are equal to each other between the screens, the resolutions of the sub-screens extending between the screens are equal to each other, and a display that does not give an unnatural feeling to the composite screen is performed. Becomes possible.

Also, in the screen composition control on each screen, the position of the child screen on each screen is controlled from the universal position information given to the multi-screen screen without performing complicated calculations. In addition, there is no need to perform processing for converting the resolution of the child screen on each screen.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a multi-screen screen synthesizing apparatus according to the present invention.

FIG. 2 is a diagram showing a timing of reading a partial molecule screen from a memory of a small screen processing unit in FIG. 1;

FIG. 3 is a circuit configuration diagram showing a specific example of a screen synthesis circuit in FIG. 1;

FIG. 4 is an explanatory diagram of a horizontal switching control signal and a vertical switching control signal in FIG. 3;

FIG. 5 is a diagram for explaining an operation of a main part of the embodiment shown in FIG. 1;

FIG. 6 is a diagram showing a display form of a sub-screen on a multi-screen screen in the embodiment shown in FIG.

FIG. 7 is a diagram for explaining a position management operation of the child screen position control device in FIG. 1;

8 is a diagram showing coordinate positions on each screen of the child screen shown in FIG. 7;

FIG. 9 is a block diagram showing a second embodiment of a multi-screen screen synthesizing apparatus according to the present invention.

FIG. 10 is a block diagram showing a third embodiment of a multi-screen screen synthesizing apparatus according to the present invention.

FIG. 11 is a block diagram showing an example of a conventional screen synthesis circuit using a single screen.

FIG. 12 is a diagram showing a sub-screen in a conventional multi-screen screen displaying a plurality of different video signals on a main screen.

FIG. 13 is a diagram showing a moving state of a pointer synthesized on a conventional multi-screen screen displaying a plurality of different video signals on a main screen.

FIG. 14 is a diagram showing a display when the resolution is changed for each sub-screen synthesized in a conventional multi-screen screen in which a plurality of different video signals are displayed on a main screen.

FIG. 15 is a diagram showing a moving state of a sub-screen synthesized on a conventional multi-screen screen displaying a plurality of different video signals on a main screen.

FIG. 16 is a diagram showing a change in an area according to a display position of a sub-screen synthesized on a conventional multi-screen screen displaying a plurality of different video signals on a main screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screen synthesis control circuit part 2a, 2b Input terminal 3, 3A-3D, 3 'Resolution conversion circuit 4 AD converter 5 Memory 6 DA converter 7 Sync separation circuit 8 Signal processing circuit 9 Output synchronization signal generation circuit 10 AD converter 11 Memory 12 Memory control circuit 13 DA converter 14, 14A to 14D Screen synthesis circuit 14c Switcher 14d AND gate 14 'Digital screen synthesis circuit 15 Switching signal generation circuit 16 Child screen position control device 17 Multi-screen screen 18 Embedded image signal generation circuit 19 DA converter

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 5C058 AA01 BA21 BA24 BA25 BB11 BB17 EA03 5C082 AA03 AA24 AA25 AA27 AA34 BA27 BB15 BD07 CA33 CA34 CA55 CA62 CA81 CA84 DA86 MM05 MM10

Claims (10)

[Claims] 1. A screen synthesizing device for a multi-screen display device having a multi-screen screen composed of a plurality of screens, comprising: a screen synthesizing control circuit unit for each screen; A resolution conversion circuit for converting the resolution of the video signal of the parent screen, and synthesizing the video signal of the parent screen whose resolution has been converted by the resolution conversion circuit and the video signal of the child screen from the processing unit for the child screen. , A screen synthesis circuit for generating a screen composite video signal for display on a corresponding screen, and a sub-screen processing unit. It outputs at a timing according to the fitting position on the screen screen and supplies it to the screen composition circuit. The screen composition control circuit unit for each screen is
The resolution of the input video signal of the main screen is converted so that they are equal to each other, and the child screen is displayed on the multi-screen screen in which the main screen is displayed at the same resolution on all the screens. A multi-screen screen synthesizing apparatus characterized in that it is configured as described above. 2. The resolution conversion circuit according to claim 1, wherein the resolution conversion circuit comprises: a synchronization separation circuit configured to separate a synchronization signal from an input video signal of the main screen; A first AD converter for converting; a first memory for storing the digital video signal of the main screen output from the first AD converter; an output synchronizing signal generating circuit; and a storage for the first memory A signal processing circuit that captures the digital video signal of the main screen obtained based on the synchronization signal from the synchronization separation circuit or the output synchronization signal generation circuit and performs resolution conversion or resolution conversion and frame frequency conversion processing; A first D / A converter for converting the digital video signal of the main screen processed by the signal processing circuit into an analog video signal; A second A / D converter for converting an input video signal of the sub-screen into a digital video signal, a second memory for storing the digital video signal of the sub-screen output from the second A / D converter, Controlling the writing of the digital video signal of the sub-screen into the second memory, at a timing corresponding to the fitting position of the sub-screen on the multi-screen screen, and at the synchronization separation circuit or the output synchronization. A memory control circuit that controls reading of the digital video signal of the child screen from the second memory in synchronization with a synchronization signal from the signal generating circuit; and a digital video signal of the child screen read from the second memory. A multi-screen screen synthesizing device, comprising: a second DA converter for converting an analog video signal. 3. The resolution conversion circuit according to claim 1, wherein the resolution conversion circuit separates a synchronization signal from an input video signal of the main screen, and converts the input video signal of the main screen into a digital video signal. A first AD converter for converting; a first memory for storing the digital video signal of the main screen output from the first AD converter; an output synchronizing signal generating circuit; and a storage for the first memory A signal processing circuit that captures the digital video signal of the main screen obtained based on the synchronization signal from the synchronization separation circuit or the output synchronization signal generation circuit and performs resolution conversion or resolution conversion and frame frequency conversion processing; A first D / A converter for converting the digital video signal of the main screen processed by the signal processing circuit into an analog video signal; Generates an image signal for displaying a sub-screen at a timing corresponding to a fitting position of the sub-screen on the multi-screen screen and in synchronization with a synchronization signal from the synchronization separation circuit or the output synchronization signal generation circuit. A multi-screen screen synthesizing apparatus, comprising: 4. The screen composition control circuit unit according to claim 1, wherein the screen composition control circuit unit determines the resolution of the input video signal of the parent screen, and inputs the resolution of the main screen to each of the screen composition control circuit units. A multi-screen screen synthesizing apparatus, wherein the resolution of the multi-screen image synthesizing unit is made to match the highest video signal resolution among the video signal resolutions. 5. The screen composition control circuit unit according to claim 1, wherein the screen composition control circuit unit determines a resolution of a video signal of the input parent screen, and the resolution of the parent screen supplied to the screen composition control circuit unit. Wherein the number of input video signals having the same resolution among the resolutions of the video signals is the same as the resolution of the video signal having the largest number of inputs. 6. The multi-screen screen according to claim 1, wherein the screen composition control circuit unit combines the resolution of the input video signal of the main screen with the main screen and displays the resolution on the multi-screen screen. A multi-screen screen synthesizing device, wherein the resolution is made to match the resolution of the video signal of the sub-screen. 7. The screen composition according to claim 1, 2, or 3, further comprising a plurality of processing units for the sub-screens, wherein a video signal of the sub-screen is input to and processed by each of the processing units for the sub-screens. A plurality of child screens can be combined and displayed on the multi-screen screen by being supplied to a circuit, and the screen combination control circuit unit combines the resolution of the input video signal of the parent screen with the parent screen. A multi-screen screen synthesizing apparatus, wherein the resolution of the video signal of the highest resolution sub-screen among the plurality of sub-screen video signals displayed on the multi-screen screen is matched. 8. The multi-screen screen according to claim 1, wherein a display area of the sub-screen on the multi-screen screen is designated by a position on the multi-screen screen, and the display area of each screen is designated from the designated position. A sub-screen position control device for determining a display area of the sub-screen is provided, wherein the screen synthesizing circuit converts the information representing the display area of the sub-screen determined by the sub-screen position control device for the relevant screen; A multi-screen image synthesizing apparatus, wherein the image signal of the main image and the image signal of the child image are synthesized based on the image signal. 9. The sub-screen position control device according to claim 8, wherein the sub-screen position control device sets a coordinate system for each of the multi-screen screen and the screen, and the display area of the sub-screen on the multi-screen screen is the multi-screen screen. Is designated by the coordinate position in the coordinate system set in the coordinate system, the designated coordinate position is assigned to each screen, and the coordinates are converted into the coordinate position in the coordinate system for each screen, and the display area of the child screen is displayed on the screen. A screen synthesizing apparatus for a multi-screen, wherein the screen is converted into a coordinate system assigned to each screen. 10. The screen synthesizing circuit according to claim 1, wherein the video signal of the main screen and the video signal of the child screen supplied to the screen synthesizing circuit are digital signals. Is a multi-screen screen synthesizing apparatus, which performs arithmetic processing on the video signal of the main screen and the video signal of the child screen and synthesizes them.