JP2001318661A - Multi-screen display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a circuit scale of an arithmetic processing part of image data, and to provide a multi-screen display device having high image processing ability. SOLUTION: This multi-screen display device is provided with display parts 10a-10d composing the multi-screen, and an arithmetic processing part 6 for extracting an image part from image data to be displayed on the multi-screen and processing them by a prescribed coordinate transformation. And also it comprises display units 5a-5d for outputting a video signal to each display means, a CPU 1 for generating the display data to be displayed on the multi- screen, and a bus/DMA controller 2 for transferring the generated image data to all the display units, respective display units 5a-5d output arithmetic processing notifying signals 11a-11d for notifying the bus/DMA control means of the end of the arithmetic processing of the image data in the arithmetic processing part 6, and the bus/DMA control means monitors the arithmetic processing notifying signals 11a-11d and controls to start transferring the image data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a multi-screen display device for displaying an image generated by a computer, and more particularly to a technique for efficiently transferring and processing image data.

[0002]

2. Description of the Related Art FIG. 10 shows, for example, Japanese Patent Publication No. 02-0617.
It is a block diagram showing the conventional multi-screen display device shown in No. 59 public information. In FIG. 10, reference numeral 21 denotes a control device for generating image data to be displayed on the entire multi-screen, 22a to 22d display computers for cutting out the assigned image portion from the image data supplied from the control device 21, 8a to 8d Is an image memory for storing image data from which an image portion handled by the display computers 22a to 22d is cut out, and 10a to 10d are the image memories 8a to 8d.
d is a display unit for displaying image data stored in d. 5
Reference numerals a to 5d denote display units including the display computers 22a to 22d, the image memories 8a to 8d, and the display units 10a to 10d, and the display units 10a to 10d of the display units 5a to 5d.
a to 10d constitute one multi-screen by arranging the respective screens two-dimensionally close to each other.

Reference numeral 23 denotes a line such as a local network or a high-speed bus for connecting the control device 21 to each of the display units 5a to 5d and transferring the image data generated by the control device 21; An input device 21 such as a keyboard, a tablet, or a mouse for inputting an instruction regarding display of image data to the control device 21;
1 is a parent computer which is automatically connected to the computer 1 and automatically generates an instruction regarding display of image data.

[0004] Next, the operation of the multi-screen display device shown as the prior art will be described. First, the control device 2
1 is based on control parameters relating to the multi-screen display setting, which are input by the user using the input means 24, or are automatically generated by the parent computer 25, and further set in the control device 21 in advance. For each of the display units 5a to 5d, an image portion to be handled by each of the display units 5a to 5d in the entire multi-screen is specified via the line 23.

After the designation of the display units 5a to 5d is completed, when an instruction relating to graphic drawing is issued from the parent computer 25 or the user, the control device 21 displays the entire multi-screen on one display based on the instruction. Image data to be displayed as a screen is generated, and the image data is transferred to each of the display units 5a to 5d in parallel via the line 23.

As the line 23, a local area network (LAN) or a high-speed bus is used. When a LAN is used as the line 23, each of the display units 5a to 5
A general-purpose graphic computer can be used as the display computers 22a to 22d. However, due to collision of data transmission timing occurring on the LAN, error control processing between the control device 21 and the network interface of the display computers 22a to 22d, and the like. Then, a delay occurs in the transfer of the image data. On the other hand, when a high-speed bus is used as the line 23, the control device 21 and each display unit 5a
Direct between the display computers 22a to 22d
High-speed transfer of image data by memory access (DMA) is possible. Therefore, a high-speed bus is generally used as the line 23 in a multi-screen display device in which an image to be displayed is high-definition, the size of image data is large, and display screen switching frequently occurs. .

Each of the display units 5a to 5
The image data DMA-transferred to the display computers 22a to 22d of "d" is temporarily stored in the buffer memories of the display computers 22a to 22d. Display computers 22a to 22d
Performs a so-called windowing process of reading the image data stored in the buffer memory and cutting out the image portion of the image data which is in charge of the image data, and performing screen processing of the display units 10a to 10d of the display units 5a to 5d. Generates pixel data of an image portion to be displayed.

Here, for one piece of image data transferred by the control device 21, after the display computers 22a to 22d of all the display units 5a to 5d complete generation of pixel data, the control device 21 displays next. Until the transfer of the image data to be completed is completed, a "data waiting time" occurs in which the display computers 22a to 22d do not process the image data. The data waiting time varies depending on the image data transfer interval of the control device 21, the image processing capabilities of the display computers 22a to 22d, and the content of the image data.

In order to reduce the data waiting time and to improve the image processing efficiency of the multi-screen display device, in the conventional multi-screen display device, the control device 21 collects a plurality of image data displayed continuously. Transfer to all display units 5a to 5d, and display units 5a to 5d
Are applied to the display computers 22a to 22d which temporarily store the transferred plurality of image data in a buffer memory, sequentially read the image data stored in the buffer memory, and continuously process the plurality of image data. You.
According to this method, the data waiting time occurs only after each of the display computers 22a to 22d completes the processing of the plurality of image data transferred collectively, thereby reducing the data waiting time. Here, each display unit 5
The capacities of the buffer memories of the display computers 22a to 22d a to 5d are determined in advance by the data size of the image data and the number of pieces of image data to be transferred collectively by the control device 21.

Next, the pixel data generated by the display computers 22a to 22d are temporarily stored in the image memories 8a to 8d. The pixel data stored in the image memories 8a to 8d are read out by the display computers 22a to 22d and displayed on the screens of the display units 10a to 10d.

With the above-described configuration, the conventional multi-screen display device integrally manages a plurality of display units 5a to 5d with one control device 21 and realizes a large-screen display function without error.

[Problems to be solved by the invention]

In the conventional multi-screen display device, the display computers 22a to 22d of the display units 5a to 5d are provided.
In order to reduce the data waiting time of 2d, the control device 21
Transmits a plurality of image data collectively to each of the display units 5a to 5d, and the display computers 22a to 22d of each of the display units 5a to 5d are sufficient to store the plurality of image data transferred from the control device 21. It is necessary to have a buffer memory of a memory capacity.

Therefore, when displaying a high-definition three-dimensional graphic image on a multi-screen display device,
Since the data size per image data generated by the control device 21 increases, each display unit 5a
There is a problem in that the buffer memories of the display computers 22a to 22d have a large capacity, and the circuit scale of each of the display units 5a to 5d becomes large.

Generally, in a multi-screen display device, in addition to three-dimensional graphic image data, drawing data such as two-dimensional images and characters for forming a graphical user interface (GUI) on a display screen,
Control data or the like for giving an instruction regarding display setting to each of the display units 5a to 5d is generated. These data are generated by separate arithmetic processing in the control device 21, and are transferred to the respective display units 5a to 5d via the line 23 each time the data is generated.

However, the time during which the three-dimensional graphic image data is DMA-transferred from the control device 21 is determined by the line 2
3 is occupied by this DMA transfer. Therefore,
If two-dimensional GUI drawing data and control data relating to display settings are generated by the control device 21 during this time, these data are not transferred to each of the display units 5a to 5d, and DMA transfer of the three-dimensional graphic image data is performed. Wait for transfer until completed. Further, when the displayed three-dimensional graphic image has high definition and the data size of the image increases, the occupation time of the line 107 required for the DMA transfer of the three-dimensional graphic image data increases, and the two-dimensional GUI drawing data and the display setting described above are increased. This causes the control data transfer wait to frequently occur.

Further, in the conventional multi-screen display device, a method is employed in which a plurality of image data are collectively DMA-transferred from the control device 21 to each of the display units 5a to 5d in order to improve image processing efficiency. However, when displaying a three-dimensional graphic image, the three-dimensional graphic image data having a large data size is continuously transferred to the DMA.
By the transfer, the occupation time of the line 23 is further lengthened. In this case, the transfer waiting time of the two-dimensional GUI drawing data and the control data related to the display setting becomes longer, and the display on the multi-screen of the two-dimensional GUI and the display setting of each of the display units 5a to 5d are performed in real time. There was a problem that it was not done.

On the other hand, when two-dimensional GUI drawing data or control data is generated during the DMA transfer, a method of interrupting the DMA transfer of the three-dimensional graphic image data and giving priority to the transfer of these data is considered. However, in this case, overhead occurs in resuming the DMA transfer,
There has been a problem that the speed of DMA transfer of three-dimensional graphic image data is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the capacity of a buffer memory required for storing image data and to display a main display object such as a three-dimensional graphic image. Another object of the present invention is to provide a multi-screen display device capable of performing other processes such as display of a two-dimensional GUI and display setting of a multi-screen in real time.

[0019]

In order to solve the above-mentioned problems and achieve the object, in a multi-screen display device according to the present invention, one screen is provided by arranging each screen adjacent to each other. A plurality of display means constituting the multi-screen, and an image portion to be displayed on the screen of the corresponding display means corresponding to each of the display means, and a predetermined coordinate transformation. A plurality of display units, comprising an arithmetic processing unit for performing processing, generating and outputting a video signal to each of the display means, and information on the shape and position of the physical object displayed on the multi-screen as image data. A central processing unit for generating the image data, and transferring the image data generated by the central processing unit to all the display units. A Rubasu · DMA controller, each display unit, the end of the calculation process of the image data in the arithmetic processing unit outputs the arithmetic processing notification signal for notifying the bus · DMA controller, said bus · DM
The A control means is configured to monitor the operation processing notification signals of all the display units and control activation of transfer of image data to the display units based on the signals.

In the multi-screen display device according to the next invention, the central processing unit is configured to execute image data to be performed by the processing unit of each of the display units based on information on the arrangement of the screen of each display unit. Automatically generates microcode that describes the program for the arithmetic processing of
Prior to the transfer of the image data, the microcode is transferred to each display unit, and the arithmetic processing unit of each display unit includes a microcode storage unit that stores the microcode generated by the central processing unit. When the arithmetic processing is performed, the microcode is automatically read from the microcode storage unit, and the arithmetic processing of the image data is performed.

In the multi-screen display device according to the next invention, the plurality of display means constituting the multi-screen are arranged not at the same plane but at a three-dimensional position with respect to the observer. It is characterized by the following.

In the multi-screen display device according to the next invention, the bus / DMA control means is a data transfer unit for receiving the image data generated by the central processing unit, and is transferred from the data reception unit. A multi-screen display control unit for transferring the image data to all the display units, a local bus for interconnecting the multi-screen display control unit and the plurality of display units, the multi-screen display control unit Transfers the image data to each display unit via the local bus, monitors the arithmetic processing notification signal output from all the display units, and transfers the image data to all the display units based on the signal. Is configured to control the activation of

In the multi-screen display device according to the next invention, each of the display units further includes an inter-unit data transfer control unit for transferring image data processed and processed with another display unit. When an image is moved between the screens of the display means on the multi-screen, the inter-unit data transfer control unit of the corresponding display unit transmits the image data processed and processed between the display units via the local bus. And the display unit to which the image data has been transferred is configured to generate a video signal of an image moved based on the image data.

In the multi-screen display device according to the next invention, the plurality of display means constituting the multi-screen are arranged such that the edge of the screen overlaps with the edge of the screen of the adjacent display means. Closely disposed, the inter-unit data transfer control unit of each display unit, between the other display unit overlapping the edge of the screen, the image data displayed in the overlapping area, via the local bus, Transfer to each other, each display unit, for an overlapping area of the screen,
The image data is interpolated by using the image data created by itself and the image data transferred from the other display unit.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of the multi-screen display device according to the first embodiment. In FIG. 1, reference numeral 1 denotes a central processing unit (CPU) that generates image data such as three-dimensional graphics displayed on a multi-screen, and 2 denotes a bus that transfers the image data generated by the CPU 1 to a plurality of display units described later.・ DM
A controller 4 and bus 4 generated by CPU 1
This is a main memory that temporarily stores image data transferred by the DMA controller 2.

The display units 10a to 10d correspond to the display units 10a to 10d, respectively, and the display units 5a to 5d correspond to the display units 10a to 10d, respectively. A display unit that performs predetermined arithmetic processing on image data transferred from the DMA controller 2 to generate pixel data to be displayed on a screen of a corresponding display unit, and displays the pixel data on the display unit.

Reference numeral 3 denotes a system bus for connecting the bus / DMA controller 2 and the plurality of display units 5a to 5d. The bus / DMA controller 2 transmits the image data to each display unit 5a via the system bus 3.
To 5d.

Each of the display units 5a to 5d includes a bus DM
An arithmetic processing unit 6 that receives the three-dimensional graphic image data transferred from the A controller 2 and performs arithmetic processing such as coordinate conversion;
A drawing processing unit 7 that generates pixel data to be displayed on a display unit in charge from the two-dimensional graphic image data and the drawing data of the two-dimensional GUI, and temporarily stores and holds the pixel data generated by the drawing processing unit 7 An image memory 8 and a D / A converter 9 for reading pixel data stored in the image memory 8 and converting the pixel data into an analog video signal are provided. The video signals converted by the D / A converter 9 are output from the display units 5a to 5d to the corresponding display units 10a to 10d. In FIG. 1, for simplicity, only the processing unit 6, the drawing processing unit 7, the drawing memory 8,
Although the D / A converter 9 is shown, all the other display units 5b to 5c have the same configuration.

Numerals 11a to 11d denote arithmetic processing notification signals for notifying that arithmetic processing of three-dimensional graphic image data has been completed, and are output from the arithmetic processing section 6 of each display unit and input to the bus / DMA controller 2.

Hereinafter, the operation of the multi-screen display device configured as described above will be described with reference to the drawings. FIG.
FIG. 4 is a flowchart showing a coordinate conversion process of three-dimensional image data in the multi-screen display device according to the first embodiment.

First, the CPU 1 designates, via the system bus 3, each of the display units 5a to 5d with respect to an image portion to be handled by each of the display units of the entire multi-screen.

Next, the CPU 1 virtually generates a "physical object" which is a three-dimensional object to be displayed as a three-dimensional graphic image. In general, all physical objects generated by the CPU 1 describe a simple three-dimensional shape defined by a plurality of vertices such as a triangle strip in which triangles are continuous in a strip, a triangle fan in which triangles are continuous in a sector, and a polygon as a “unit object”. And represented as a large number of such unit objects. Further, attributes such as the color and pattern of the surface of the physical object are specified for each unit object, and the physical object is also represented by the attribute.

Each physical object has its own coordinate system "object coordinate system", and the vertices of all unit objects constituting the physical object are defined by attributes such as position and color on the object coordinate system. Is done. Hereinafter, attribute data such as the position and color of each vertex of the unit object forming the physical object is referred to as “vertex data”.

The CPU 1 virtually defines a three-dimensional space in which the generated physical objects are arranged. This virtual space has a “world coordinate system” which is a unique coordinate system.
The CPU 1 converts the vertex data of the physical object placed in the virtual space in the object coordinate system into the vertex data in the world coordinate system of the virtual space. This coordinate conversion process is called “model view conversion” (FIG. 2,
Step S1). By the model view conversion, the position and angle of the physical object placed in the virtual space are represented by vertex data of the world coordinate system in the virtual space, and the movement, such as movement and rotation, of the physical object in the virtual space are performed in the world coordinate system. Expressed by changes in vertex data.

The CPU 1 virtually sets the viewpoint and the light source of the observer in the virtual space, and expresses them with position data in the world coordinate system. The CPU 1 stores vertex data in the world coordinate system of all object objects displayed on the multi-screen, position data of the virtual observer viewpoint, parameters relating to the position and light amount of the light source, and the like.
The three three-dimensional graphic image data are stored in the main memory 4. The CPU 1 calculates the motion of the physical object in the virtual space, continuously generates three-dimensional graphic image data to be displayed on the multi-screen, and sequentially stores the generated image data in the main memory 4.

Next, the bus / DMA controller 2 monitors the operation processing notification signals 11a to 11d of the respective display units, and confirms that all the display units 5a to 5d are not performing the operation of the three-dimensional graphic image data. After confirmation, one image data to be displayed first is read out of the three-dimensional graphic image data stored in the main memory 4 and DMA-transferred to all the display units 5a to 5d via the system bus 3. . Here, since the three-dimensional graphic image data transferred to all the display units 5a to 5d is the same, the bus / DMA controller 2 uses a broadcast function for simultaneously transferring data to all the display units, The image data is transferred.

The processing of each of the display units 5a to 5d for one three-dimensional graphic image data will be described below. First, three-dimensional graphic image data DMA-transferred from the bus / DMA controller 2 via the system bus 3 is received by the arithmetic processing unit 6 of each of the display units 5a to 5d.

Next, the arithmetic processing unit 6 calculates the physical object vertex data, the observer viewpoint position data, and the light source parameters for the three-dimensional graphic image data represented as vertex data in the world coordinate system. A light source process for calculating information related to light reflection on the surface of the object and other arithmetic processes required for three-dimensional graphic display are performed.

Further, the arithmetic processing unit 6 performs a virtual operation between the observer's viewpoint and the physical object based on the position data of the virtual observer's viewpoint included in the preset three-dimensional graphic image data. After setting a proper view plane, the vertex data of the world coordinate system on which the arithmetic processing has been performed is projected onto the view plane and converted into vertex data of a view plane coordinate system which is a two-dimensional coordinate system (FIG. 2). , Step S2). This conversion of the vertex data is called “view conversion”. Here, all the display units 10a to 10d constituting the multi-screen
Are placed on the same plane,
The view plane set by the arithmetic processing unit 6 is the same plane in all display units, and the projection image of the physical object onto the view plane obtained as a result of the view conversion is finally displayed on the multi-screen. It becomes a power three-dimensional graphic image.

On the other hand, the display unit on which a three-dimensional graphic image is displayed has a "window coordinate system" which is a unique two-dimensional coordinate system corresponding to the screen resolution and screen size of the display unit. The vertex data of the physical object displayed on the screen of the display unit needs to be expressed in this window coordinate system. Therefore, the arithmetic processing unit 6 converts the vertex data in the display field plane coordinate system into vertex data in the window coordinate system unique to each display unit by a coordinate conversion process called “normalization / viewport conversion” (FIG. 2). , Step S3).

The normalization and viewport conversion of three-dimensional graphic image data in the arithmetic processing unit 6 will be described below with reference to FIG. FIG. 3 is an explanatory diagram showing a state where a simple physical object is displayed on the multi-screen. In FIG. 3, a total of 4 on each of two sides in each of the vertical and horizontal directions
The screens of the surface display units 10a to 10d are arranged closely on one and the same multi-screen,
A simple triangular object PQR is displayed.

As a result of the visual field conversion by the arithmetic processing unit 6, the triangle PQR, which is an object object to be displayed on the multi-screen, is determined by the vertex data of the visual field plane coordinate system, that is, the vertices P, Q, and R of the object object. It is represented by the coordinate position of the viewing plane coordinate system.

On the other hand, only a part of the three-dimensional graphic image displayed on the multi-screen is displayed on the screen of one display unit, for example, only the upper left part in FIG. 3 is displayed on the screen of the display unit 10a. Therefore, the arithmetic processing unit 6 cuts out an image portion to be displayed on the display unit in charge from the vertex data of the visual field plane coordinate system and performs coordinate conversion.

First, the arithmetic processing section 6 calculates the coordinate positions of points X1, X2, Y1, and Y2, which are the intersections between the edges of the image portion to be displayed on the display section in charge and the contours of the physical objects. Is added to the vertex data of the view plane coordinate system as a vertex. Next, the arithmetic processing unit 6 determines, among the vertex data of the view plane coordinate system to which the new vertex has been added, the vertex included in the image portion displayed on the display unit in charge, for example, in the case of the display unit 10a, 3, the vertices P, X1, X2, Y1, and Y2 included in the upper left portion are converted from vertex data in the view plane coordinate system into vertex data in the window coordinate system unique to the display unit 10a, and the display unit 10a in charge of the display unit 10a. Discards vertex data other than the vertices included in the image portion displayed by. As a result, the arithmetic processing unit 6
The vertex data of the three-dimensional graphic image to be displayed on each display unit in the window coordinate system is calculated.

When the arithmetic processing unit 6 generates the vertex data of the window coordinate system, the arithmetic processing unit 6 transfers the vertex data of the window coordinate system to the drawing processing unit 7 and generates the arithmetic processing notification signals 11a to 11d. To notify the bus / DMA controller 2 of the completion of the arithmetic processing relating to the image data via.

The drawing processing unit 7 creates pixel data to be displayed on the screen of the display unit from the vertex data in the window coordinate system, and writes the pixel data into the image memory 8. The pixel data stored in the image memory 8 is read out by the D / A converter 9 and converted into an analog image signal. Each of the display units 5a to 5d outputs the image signal to a corresponding display unit, and each of the display units 10a to 10d inputs the image signal and displays an image portion of a three-dimensional graphic image assigned to a screen. The above is the processing in each of the display units 5a to 5d regarding the display of one piece of three-dimensional graphic image data.

On the other hand, in the bus / DMA controller 2,
A plurality of three-dimensional graphic image data generated by the CPU 1 and stored in the main memory 4 is sequentially DM-transmitted to each of the display units 5a to 5d via the system bus 3.
A transfer. Hereinafter, a method of transferring a plurality of three-dimensional graphic image data by the bus / DMA controller 2 in the multi-screen display device according to the first embodiment will be described with reference to FIG. FIG. 4 is an operation explanatory diagram showing a method of transferring a plurality of three-dimensional graphic image data by the bus / DMA controller 2 according to the first embodiment. FIG. 4 shows a case where three three-dimensional graphic image data (# 1 to # 3) are DMA-transferred.

In the first embodiment, the bus / DMA controller 2 receives the arithmetic processing notification signals 11a to 11d from the display units 5a to 5d, and calculates the three-dimensional graphic image data in the arithmetic processing unit 6 of each display unit. Monitors the end of processing. Arithmetic processing notification signals 11a to 1
As a result of monitoring 1d, when it is determined that the arithmetic processing of the three-dimensional graphic image data is not performed in all the display units, the bus / DMA controller 2
Of 3D graphic image data # 1 stored in
A transfer is started.

The arithmetic processing unit 6 of each of the display units 5a to 5d
Performs arithmetic processing on the DMA-transferred three-dimensional graphic image data # 1 as described above, and outputs an arithmetic processing notification signal 11
The bus / DMA controller 2 is notified of the end of the three-dimensional graphic arithmetic processing using a to 11d.

In general, the processing load and the processing time performed by the processing unit 6 are different for each display unit according to the contents of the three-dimensional graphic assigned to each display unit. In the example shown in FIG. 3, the calculation processing of the display unit 5d is completed in the shortest time for the three-dimensional graphic image data # 1, and the calculation processing of the display unit 5a takes the longest time. In this case, the bus / DMA controller 2 operates until the notification of the completion of the arithmetic processing from the arithmetic processing units 6 of all the display units arrives, that is, until the notification of the completion of the arithmetic processing of the display unit 5a is received. The DMA transfer of the data # 2 is not started.

When the end of the arithmetic processing of the three-dimensional graphic image data # 1 is notified from the arithmetic processing unit 6 of the display unit 5a via the arithmetic processing notification signal 11b, the bus DM
The A controller 2 determines that the arithmetic processing has been completed in all display units, reads out the three-dimensional graphic image data # 2 stored in the main memory 4, and performs DMA transfer to all display units. Thereafter, the bus / DMA controller 2 and each of the display units 5a to 5d perform the three-dimensional graphic arithmetic processing and the DMA transfer of the image data # 3 in each of the display units in the same procedure as described above.

In general, in a multi-screen display device, in addition to the three-dimensional graphic image data processed as described above, drawing data such as a two-dimensional image and characters for forming a GUI on a display screen, Control data or the like for giving an instruction regarding display setting to each display unit is generated. These data are transferred by the CPU 1 to 3
Each display unit 5a is generated by the bus / DMA controller 2 during an idle time of the system bus 3 in which the DMA transfer of the three-dimensional graphic image data is generated by an arithmetic processing completely different from the generation of the three-dimensional graphic image data. To 5d. Therefore, while the system bus 3 is occupied by the DMA transfer of the three-dimensional graphic image data, the transfer of the drawing data and control data of the two-dimensional GUI is awaited.

In the first embodiment, the bus / DMA controller 2 transfers the three-dimensional graphic image data one by one to the
Forward. As a result, an idle time of the system bus 3 always occurs after the DMA transfer of one three-dimensional graphic image data, and the two-dimensional GUI drawing data and control data are transferred during the idle time. Therefore, the transfer waiting time for drawing data or the like of the two-dimensional GUI falls within the time for transferring at most one piece of three-dimensional graphic image data.

With such a configuration, the multi-screen display device of the first embodiment controls the start of the DMA transfer of the three-dimensional graphic image data by using the operation processing notification signals 11a to 11d. The arithmetic processing unit 6 of the display unit only needs to hold one piece of three-dimensional graphic image data on which arithmetic processing is performed. Therefore, as compared with a conventional multi-screen display device in which three-dimensional graphic image data is continuously DMA-transferred, the capacity of a buffer memory arranged in each display unit can be significantly reduced.

Further, the transfer of the next three-dimensional graphic image data is started after the completion of the arithmetic processing of the three-dimensional graphic image data in all the display units, so that the occurrence of the data waiting time of each display unit is minimized. , And a decrease in the image processing efficiency of each display unit can be prevented.

Further, since the DMA transfer of the three-dimensional graphic image data is performed one by one with a vacant time therebetween,
The two-dimensional GUI drawing data and control data generated separately from the two-dimensional graphic image data can be transferred to each display unit during the idle time, so that the two-dimensional GUI drawing and the control of each display unit and display unit are delayed. Time can be reduced.

In the multi-screen display device according to the first embodiment, the case where the number of display units and the number of display units are four is shown, but the number of display units and the number of display units is not limited to this. The effect of the first embodiment can be obtained with a multi-screen display device including a plurality of display units and display units instead of the above.

The arithmetic processing notification signals 11a to 11d are each directly input to the bus / DMA controller 2, but this is not limited to such a configuration.
A configuration may be employed in which a signal notifying that arithmetic processing has been completed in all display units is input to the bus / DMA controller 2. Further, when there are a large number of display units constituting the multi-screen display device, these are divided into several blocks, and the completion of the arithmetic processing of the display units is notified to the bus / DMA controller 2 for each block. It may be a configuration.

Further, in the multi-screen display device according to the first embodiment, the CPU 1 performs model view conversion for the processing of generating three-dimensional graphic image data, and transfers the created image data to each display unit.
In each of the display units 5a to 5d, the light source processing, the clipping processing, the visual field conversion, the normalization, and the viewport conversion are performed. However, the processing sharing of each arithmetic processing is not limited to this. A configuration may be adopted in which a part of the arithmetic processing performed by the units, for example, light source processing and clipping processing is performed by the CPU, and then the image data is transferred to each display unit.

Embodiment 2 In a simulation device for driving, maneuvering, steering, etc., the screens of a plurality of display units for displaying a three-dimensional graphic image are arranged in the same manner as the actual arrangement of the driver's cab windows, such as the front, both sides, and top of the observer. It needs to be arranged three-dimensionally. The multi-screen display device according to the second embodiment displays a three-dimensional graphic image on a plurality of three-dimensionally arranged screens.

FIG. 5 is an external view showing the arrangement of a plurality of screens in the multi-screen display device according to the second embodiment. In FIG. 5, 12a to 12d are 1 in total.
A plurality of screens 13 of the multi-screen display device forming one multi-screen are the viewpoint positions of the observer using the multi-screen display device. In the multi-screen display device according to the second embodiment, in order to enhance the sense of reality given to the observer, the screens of the plurality of display units are arranged such that 12a is the front, 12b is the left side,
12c is disposed on the right side, and 12d is disposed on the upper surface, and is not disposed on the same plane. Observer viewpoint 13 in multi-screen display device and screen 12 of each display unit
The positional relationships a to 12d are measured in advance as multi-screen display control parameters.

FIG. 6 is a configuration diagram of the multi-screen display device according to the second embodiment. In the multi-screen display device of the second embodiment, the display units 12a to 12
Each screen of d is not arranged on the same plane. Therefore, the visual field plane set in the visual field conversion of the arithmetic processing unit 6 is different for each display unit, and the visual field conversion arithmetic processing for converting the vertex data of the physical object from the world coordinate system to the visual field plane coordinate system is also performed for each display unit. It differs every time. In order to perform different visual field conversion arithmetic processing for each display unit, the arithmetic processing unit 6 of each display unit according to the second embodiment includes a microcode that stores a microcode describing a program related to the visual field conversion arithmetic processing. It has a storage unit 14. The display unit 5a thus configured
To 5d are connected to the corresponding display units 12a to 12d, respectively. The second embodiment differs from the first embodiment only in the arrangement of the screens of the display units 12a to 12d and the configuration of the arithmetic processing unit 6. Therefore, the same reference numerals are given to the other configurations. The description is omitted.

Hereinafter, the operation of the multi-screen display device configured as described above will be described. First, the CPU 1 creates a virtual three-dimensional space as in the first embodiment, places a physical object to be displayed on the multi-screen in the space, and virtually sets the observer's viewpoint. .

The CPU 1 stereoscopically sets a plurality of viewing planes around the virtual observer's viewpoint based on the multi-screen display control parameters measured in advance. As shown in FIG.
When the screen 12d is arranged on the front, left side, right side, and top surface with respect to the actual observer viewpoint 13, the view plane in the virtual space set by the CPU 1 is also the virtual observer viewpoint. , The left side, the right side, and the top. The field planes set in this way have their own field plane coordinate systems.

Next, the CPU 1 automatically generates a microcode describing a program for performing a geometric calculation process for converting vertex data in the world coordinate system of the physical object placed in the virtual space into vertex data in the view plane coordinate system. To be generated. For example, for a field plane set in front of a virtual observer's viewpoint, a microcode describing a program for geometric calculation processing for converting vertex data in the world coordinate system into vertex data in the front field plane coordinate system is described. Is generated. Since each of the plurality of view planes set in the virtual space has a unique view plane coordinate system, a different microcode for geometric calculation processing is generated for each view plane.

The microcode generated by the CPU 1 is transmitted to the bus / DMA controller 2 and the system bus 3
Is transferred to a display unit that performs arithmetic processing corresponding to each field plane. For example, the microcode relating to the geometric operation processing of the coordinate transformation generated for the field plane set in front of the observer's viewpoint is transferred to the corresponding display unit 5a in charge of the display unit 12a. The microcode relating to the geometric operation processing of the coordinate conversion is stored in the microcode storage unit 14 of the operation processing unit 6 of each display unit.

For all display units 5a to 5d,
When the transfer of the microcode relating to the geometric operation processing of the coordinate conversion is completed, the CPU 1 sequentially generates three-dimensional graphic image data represented by vertex data in the world coordinate system, and stores it in the main memory 4. The bus / DMA controller 2 reads out the three-dimensional graphic image data stored in the main memory 4 and performs DMA transfer to all the display units 5 a to 5 d via the system bus 3. Here, as described above, the visual field conversion that requires different arithmetic processing depending on the arrangement of the screens of the display unit is performed separately in the arithmetic processing unit 6 of each display unit. Units 5a to 5d
, The vertex data of the same world coordinate system is DMA-transferred as three-dimensional graphic image data using a broadcast function.

The three-dimensional graphic image data DMA-transferred to each of the display units 5a to 5d is read by the arithmetic processing unit 6. The arithmetic processing unit 6 performs light source processing, clipping processing, and the like on vertex data in the world coordinate system transferred as three-dimensional graphic image data,
The microcode which describes the program of the geometrical operation processing of the coordinate transformation which is transferred from the CPU 1 in advance and stored in the microcode 14 is read out, and the vertex data of the world coordinate system is converted into the vertex data of the view plane coordinate system according to the microcode. Convert. Thereafter, as in the first embodiment, normalization and viewport conversion are performed to generate vertex data in the window coordinate system, and output to the drawing processing unit 7.

Thereafter, as in the first embodiment, the drawing processing unit 7 creates pixel data to be actually displayed on the display unit from the vertex data in the window coordinate system, writes the pixel data into the image memory 8, and writes the image data into the image memory 8. The pixel data stored in the memory 8 is read out by the D / A converter 9 and converted into an analog image signal. Each of the display units 5a to 5d outputs the image signal to the corresponding display unit 12a to 12d, and each of the display units 12a to 12d receives the image signal and displays an image on a three-dimensionally arranged screen. I do.

As in the first embodiment, the bus / DM
The A controller 2 receives operation processing notification signals 11a to 11d from each display unit, and reports the end of the operation processing in the operation processing unit 6 of each display unit. The bus / DMA controller 2 reads from the main memory 4 one 3D graphic image data to be displayed next after confirming that the arithmetic processing of the 3D graphic image data is not performed in all the display units. Then, DMA transfer is performed to each display unit via the system bus 3. Since the DMA transfer of the three-dimensional graphic image data by the bus / DMA controller 2 is controlled by the operation processing notification signals 11a to 11d, the system bus 3 is not continuously occupied by the DMA transfer for a long time.

As described above, in the second embodiment,
The three-dimensional graphic image data represented by the vertex data of the world coordinate system is displayed on all the display units 5a to 5d by D.
MA transfer, and in the arithmetic processing unit 6 of each display unit,
Calculation processing such as conversion of the visual field plane coordinate system displayed on each display unit to vertex data is performed. Therefore, for example, as in a driving simulator device, even when the screens of a plurality of display units are arranged in a three-dimensional manner, and the calculation processing of the visual field conversion is different for each display unit configuring the multi-screen,
Since the three-dimensional graphic image data transferred to all the display units via the system bus 3 is the same, a multi-screen display device having a high image processing capability by efficiently transferring using the broadcast function of the system bus 3 is provided. Can be provided. Further, even when the number of screens is increased, there is an effect that a multi-screen can be configured without increasing the processing load of the CPU 1.

Further, the CPU 1 automatically generates microcode describing a program for performing a conversion process to a visual field plane coordinate system performed in each display unit according to a preset multi-screen display control parameter,
Since each of the display units performs the arithmetic processing of the three-dimensional graphic image data according to the microcode, the arithmetic processing of the three-dimensional graphic image data in each display unit can be freely changed by changing the display control parameters of the multi-screen. And can correspond to various multi-screen arrangements.

Embodiment 3 FIG. 7 is a configuration diagram of the multi-screen display device according to the third embodiment. In FIG. 7, reference numeral 15a denotes a data transfer unit for reading image data to be displayed on the multi-screen from three-dimensional graphic image data generated by the CPU 1 and stored in the main memory 4, and 15b is read by the data transfer unit. This is a multi-screen display controller that receives three-dimensional graphic image data via the system bus 3 and transfers the image data to the display units 5a to 5d. The data transfer unit 15a and the multi-screen display controller 15b are connected to each other by a system bus 3, and both of them are configured to correspond to the bus / DMA controller 2 in the first embodiment.

Reference numeral 16 denotes a local bus provided between the multi-screen display controller 15b and the plurality of display units 5a to 5d to transfer data. In the third embodiment, the display units 5a to 5d are not connected to the system bus 3 but are connected only to the local bus 16. In addition, the arithmetic processing notification signals 11a to 11a to
11d is input to the multi-screen display controller 15b.

Reference numeral 17 denotes an inter-unit data transfer controller provided in each of the display units 5a to 5d, and various types of data are transmitted to and from the multi-screen display controller 15b via the local bus 16 or between the display units. Exchange data.

The multi-screen display device of the third embodiment differs from the first embodiment in that the data transfer unit 15a and the multi-screen display controller 15
The method of transferring three-dimensional graphic image data from b to the display units 5a to 5d and the method of transferring data between the display units are different from each other. ,as well as,
Only the method of transferring data between the display units will be described, and the other operations are the same, and the description will be omitted.

First, the data transfer unit 15a
The three-dimensional graphic image data generated by U1 and stored in the main memory 4 is read and transferred to the multi-screen display controller 15b via the system bus 3.
The multi-screen display controller 15b monitors the arithmetic processing notification signals 11a to 11d of the respective display units, and confirms that all the display units are not performing arithmetic processing of the three-dimensional graphic image data. The three-dimensional graphic image data is transferred via the CPU. Here the multi-screen display controller is
Using the broadcast function of the local bus 16,
The same three-dimensional graphic image data is DMA-transferred to all display units at once.

In each of the display units 5a to 5d, the inter-unit data transfer controller 17 reads the three-dimensional graphic image data DMA-transferred from the multi-screen display controller 15b and sends it to the arithmetic processing unit 6. The arithmetic processing unit 6 performs arithmetic processing such as light source processing, clipping processing, visual field conversion, and normalization / viewport conversion on the transferred three-dimensional graphic image data. The image data subjected to the arithmetic processing is converted by the drawing processing unit 7 into pixel data to be displayed on the screen of the display unit.

Each of the display units 5a to 5d transfers the pixel data generated by the drawing processing unit 7 between the display units via the local bus 16. Hereinafter, a method of transferring pixel data between display units via the local bus 16 will be described with reference to the drawings.

FIG. 8 shows a two-dimensional GU on a multi-screen.
FIG. 9 is an explanatory diagram showing a case where I is moved. FIG.
, 18 is a window of a two-dimensional GUI, and 19a and 19b are physical objects of a three-dimensional graphic image.

First, in the display unit 5 a to which the drawing data of the two-dimensional GUI window 18 has been transferred from the CPU 1, a portion of the part to be hidden behind the two-dimensional GUI window 18 is displayed prior to the display of the two-dimensional GUI window 18. The pixel data of the three-dimensional graphic image is temporarily saved in the main memory 4. Next, the display unit 5a performs two-dimensional display according to the drawing data of the two-dimensional GUI.
The window 18 of the dimensional GUI is displayed on the multi-screen on the display unit 10a arranged at the upper left in FIG.

When the CPU 1 instructs the movement of the two-dimensional GUI window 18 via the bus / DMA controller 2, the multi-screen display controller 15b transfers the instruction to each of the display units 5a to 5d. Here, a case where an instruction is given to move the two-dimensional GUI window 18 from the display unit 10a to the display unit 10c arranged at the upper right in FIG. 8 will be described.

In the display unit 5 a receiving the instruction to move the two-dimensional GUI window 18, the inter-unit data transfer controller 17 sends the pixel data of the two-dimensional GUI window 18 stored in the drawing memory 8 via the drawing processing unit 7. Read out the two-dimensional GUI window 18
Is transferred to the display unit 5c which is displayed by moving. Next, the drawing processing unit 7
In addition to deleting the pixel data of the two-dimensional GUI window 18, the part hidden behind the back of the two-dimensional GUI window 18 previously saved in the main memory 4 via the inter-unit data transfer controller 17 and the multi-screen display controller 15b. The pixel data is read out and the corresponding portion is displayed.

On the other hand, in the display unit 5c to which the pixel data of the two-dimensional GUI window 18 has been transferred, the inter-unit data transfer controller 17 transfers the pixel data to the drawing processing unit 7. The drawing processing unit 7 uses the pixel data transferred from the display unit 5a as it is, and displays a two-dimensional GUI at a designated position on the display unit 10c.
A window 18 is displayed. At that time, the display unit 5c
Is a part of the part that will be hidden behind the two-dimensional GUI window before the two-dimensional GUI window is displayed.
Pixel data such as a two-dimensional graphic image is temporarily saved in the main memory 4.

With such a configuration, the multi-screen display device according to the third embodiment is provided with a local bus 16 for connecting a plurality of display units separately from the system bus 3. , The three-dimensional graphic image data is DMA-transferred from the multi-screen display controller 15b to each display unit via the multi-screen display controller 15b. At the same time, since the image processing performed by the plurality of display units can be hidden from the CPU 1, a multi-screen display device can be configured without error.

Since the local bus 16 is configured independently of the system bus 3, data can be transferred between the display units without increasing the bus occupation time of the system bus 3. With this, a two-dimensional GU can be displayed across display units on a multi-screen.
When the I window or the like is moved, the two-dimensional GU
I pixel data can be directly transferred between corresponding display units via the local bus without passing through the system bus 3 and the main memory 4.
Of the multi-screen display device can be improved by reducing the bus occupation time of the multi-screen display device.

In the third embodiment, the two-dimensional GUI
When the window is displayed, pixel data such as a three-dimensional graphic image of a portion to be hidden behind the window is temporarily saved in the main memory 4. However, the saving destination of the pixel data is limited to the main memory 4. The image memory 8 of each of the display units 5a to 5d is not
The same applies to a configuration in which an area for saving data is provided in the area and the pixel data is saved in the area, or a memory for saving data is provided in the multi-screen display controller 15b and the pixel data is saved in the memory. It is possible to obtain the effect of

Embodiment 4 In the multi-screen display device according to the fourth embodiment, a plurality of screens constituting the multi-screen are arranged such that their edges overlap each other, and image data in the overlapping area is mutually transferred between the display units. Then, a complement process is performed.

FIG. 9 is an explanatory diagram showing how the screens of the multi-screen display device according to the fourth embodiment overlap. In FIG. 9, the screens of the display units 10a to 10d are closely arranged to form one multi-screen. In the fourth embodiment, adjacent screens are arranged such that the edges overlap each other. The shaded area 20 in FIG. 9 is an area where adjacent screens overlap. For example, the screen of the display unit 10a arranged at the upper left in FIG. 9 has the lower end of the screen of the display unit 10b arranged at the lower left in the figure, and the right end of the screen of the display unit 10c arranged at the upper right in the figure. An area 20 that overlaps the screen is included.

In FIG. 9, a triangular PQR, which is a simple physical object, is displayed on the multi-screen. Here, Ya1 and Ya2 are physical objects PQ
The outline of R is a point where the edge of the screen of the display unit 10a intersects, and Yc1 and Yc2 are points where the outline of the physical object PQR intersects with the edge of the screen of the display unit 10c.

The fourth embodiment differs from the third embodiment in that a plurality of screens are arranged such that their edges overlap each other, and image data in the overlapping area is mutually transferred between display units. Therefore, only the transfer of the image data between the display units and the interpolation processing in the overlapping area will be described below, and the other components will be denoted by the same reference numerals and description thereof will be omitted.

First, in each of the display units 5a to 5d, the three-dimensional graphic image data DMA-transferred from the multi-screen display controller 15b is read by the inter-unit data transfer controller 17 and transferred to the arithmetic processing unit 6. The arithmetic processing unit 6 performs light source processing, clipping processing, visual field conversion, normalization / viewport conversion, and the like on the three-dimensional graphic image data to generate vertex data in a window coordinate system. The intersection between the edge of the screen of the display unit and the contour of the displayed physical object is added as a new vertex to the vertex data of the window coordinate system by the normalization / viewport conversion. In FIG. 9, for simplicity, only the intersection points Ya1, Ya2, Yc1, and Yc2 existing in a portion adjacent to the display units 10a and 10c are clearly shown for simplicity.

The vertex data in the window coordinate system created by the arithmetic processing unit 6 is converted by the rendering processing unit 7 into pixel data. In the pixel data, an area 20 where the screens of the display unit overlap is generated by the corresponding display unit. For example, in the adjacent display units 10a and 10c, vertexes Ya1, Ya
The pixel data of the overlapping area 20 including the part of the physical object defined by 2, Yc1, and Yc2 is generated by the drawing processing units 7 of both the corresponding display units 5a and 5c.

Next, the drawing processing unit 7 of each display unit
The pixel data in the overlapping area 20 is transferred to the inter-unit data transfer controller 17, and the inter-unit data transfer controller 17 transfers the pixel data to the local bus 16.
Is transferred to the display unit of the overlapped partner via. That is, the display units 10a and 10c mutually communicate the vertices Ya1 and Y1 via the local bus 16.
The pixel data of the overlapping area 20 including a2, Yc1, and Yc2 is transferred.

The drawing processing unit 7 of each display unit uses the pixel data of the overlapping area 20 transferred from the other display units and the pixel data of the overlapping area 20 created by itself to generate the pixel data of the overlapping area 20. Perform interpolation processing. In this interpolation processing, a general image processing technique such as pixel thinning of the pixel data of the overlapping area 20 and calculation of an intermediate value between the two pixel data is used. By performing such interpolation processing, colors and brightness naturally transition between adjacent screens, and the continuity of the image is reproduced to a high degree.

With such a configuration, the multi-screen display device according to the fourth embodiment has the local bus 16
The pixel data of the overlapping area 20 are mutually transferred via the interface, and the image is interpolated between the adjacently arranged screens, so that the screen joints are inconspicuous even in a multi-screen constituted by a plurality of screens. An image such as a three-dimensional graphic can be displayed with high quality. Further, since the transfer of the pixel data of the overlapping area 20 is performed by using the local bus 16 connecting the display units, the pixel data is interpolated between the adjacent screens as described above. Therefore, the occupation time of the system bus 3 is not increased.

In the first to fourth embodiments,
The transfer of image data and calculation processing when displaying a three-dimensional graphic image on a multi-screen as a main object have been described. However, this is not limited to a three-dimensional graphic image, and a two-dimensional image is mainly used as a main object. Even when displaying on a multi-screen, it is naturally possible to obtain the same effect.

【The invention's effect】

As described above, according to the present invention, the bus D
The MA control means monitors an arithmetic processing notification signal for notifying the completion of arithmetic processing of image data output from each display unit, and controls activation of transfer of image data to each display unit based on the signal. Thereby, the transfer waiting time of the image data in each display unit can be reduced, and the image processing capability of the entire multi-screen display device can be increased. In addition, since only one image data is required to be processed by each display unit, the capacity of the buffer memory required to hold the image data can be reduced, and the circuit of each display unit can be reduced. The scale can be reduced.

In addition, arithmetic processing such as extraction of a different image portion and predetermined coordinate conversion according to the arrangement of the screen of the display means is performed separately in the arithmetic processing sections of the display units corresponding to the respective display means. Because it was configured
The bus / DMA control means can perform DMA transfer of image data, which is information on the shape and position of a physical object to be displayed, using a broadcast function of simultaneously transferring the image data to all display units. Therefore, the time occupied by the system bus for the DMA transfer is shortened as much as possible, and the transfer waiting time of data other than the main display target image data, for example, the drawing data of the two-dimensional GUI, the control data of each display device, and the like. Can be shortened.

The central control processing means automatically generates a microcode describing a program for an arithmetic processing such as extraction of an image portion and coordinate conversion based on information on the arrangement of the screen of each display means. The arithmetic processing unit of the display unit is configured to perform arithmetic processing of image data according to the microcode, so that it is possible to cope with various screen arrangements by changing information regarding the screen arrangement. In addition, it is possible to provide an easy-to-use multi-screen display device having a high degree of freedom in arrangement of each screen.

Further, a local bus for connecting the plurality of display units is provided, and each display unit is provided with an inter-unit data transfer control unit for transferring the image data which has been processed between the display units via the local bus. By doing so, the image processing capability of the multi-screen display device can be increased.

Each of the display means is closely arranged so that the edge of the screen overlaps with the edge of an adjacent screen, and transfers image data between the corresponding display units in the overlapping area. By performing interpolation processing such as pixel thinning and intermediate value calculation using the image data created by the user and the transferred image data, the continuity of images between adjacent screens is highly reproduced, and screen seams are conspicuous. It is possible to provide a multi-screen display device that displays images with high quality.

[Brief description of the drawings]

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

FIG. 2 is a process flowchart showing a calculation process of coordinate transformation of three-dimensional graphic image data according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an example in which simple physical objects are displayed on the multi-screen display device according to the first embodiment of the present invention.

FIG. 4 is an operation explanatory diagram showing a method of transferring a plurality of three-dimensional graphic image data in the multi-screen display device according to the first embodiment of the present invention.

FIG. 5 is an external view showing an arrangement of a plurality of screens in a multi-screen display device according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram of a multi-screen display device according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a multi-screen display device according to a third embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a case where a two-dimensional GUI is moved in the multi-screen display device according to the third embodiment of the present invention.

FIG. 9 is an explanatory diagram showing how the screens of the multi-screen display device according to the fourth embodiment of the present invention overlap.

FIG. 10 is a configuration diagram showing a conventional multi-screen display device.

[Explanation of symbols]

Reference Signs List 1 CPU 2 bus / DMA controller 3 system bus 4 main memory 5a, 5b, 5c, 5d display unit 6 arithmetic processing unit 7 drawing processing unit 8, 8a, 8b, 8c, 8d image memory 9 D / A conversion unit 10a, 10b , 10c, 10d, 12a, 12b, 1
2c, 12d Display unit 11a, 11b, 11c, 11d Calculation processing notification signal 13 Observer viewpoint 14 Microcode storage unit 15a Data transfer unit 15b Multi-screen display controller 16 Local bus 17 Inter-unit data transfer controller 18 Two-dimensional GUI window 19a , 19b Three-dimensional physical object 20 Area where screens of adjacent display units overlap 21 Control means 22a, 22b, 22c, 22d Display computer 23 Line 24 Input device 25 Parent computer P, Q, R Vertex of physical object X1, X2, Y1, Y2, Ya1, Ya2, Yc1, Y
c2 Intersection between the outline of the object and the boundary of the screen of the display unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B069 AA01 BA03 BB06 DD01 KA04 LA14 5C058 BA23 BB05 BB13 BB25 5C082 AA01 AA21 BA12 BA34 BA35 BB01 BB26 BB46 BD01 BD07 CA55 CA81 CA85 CB03 CB05 CB10 DA86 EA15 MM

Claims (6)

[Claims] 1. A plurality of display means constituting one multi-screen by arranging respective screens adjacent to each other, and corresponding to each of the display means and corresponding to image data to be displayed on the multi-screen. A plurality of display units, comprising: an arithmetic processing unit that extracts an image portion to be displayed on a screen of a display unit and performs a predetermined coordinate conversion process, and generates and outputs a video signal to each of the display units; A central processing unit for generating information on the shape and position of the physical object displayed on the multi-screen as image data; and transferring the image data generated by the central processing unit to all of the display units. A multi-screen display device comprising: a bus / DMA control unit, wherein each of the display units includes the arithmetic processing unit The bus / DMA control means outputs an arithmetic processing notification signal for notifying the bus / DMA control means of the end of the arithmetic processing of the image data in the above, and the bus / DMA control means monitors the arithmetic processing notification signals of all the display units. A multi-screen display device configured to control activation of transfer of image data to the display unit. 2. The computer according to claim 1, wherein the central processing unit automatically executes a microcode describing a program of image data arithmetic processing to be performed by an arithmetic processing unit of each of the display units based on information on an arrangement of a screen of each display unit. Generated,
Prior to the transfer of the image data, the microcode is transferred to each display unit, and the arithmetic processing unit of each display unit includes a microcode storage unit that stores the microcode generated by the central processing unit; 2. The multi-screen display device according to claim 1, wherein when performing the arithmetic processing, the microcode is automatically read from the microcode storage unit and arithmetic processing of image data is performed. 3. The multi-display as claimed in claim 2, wherein the plurality of display means constituting the multi-screen are arranged not at the same plane but at a three-dimensional position with respect to an observer. Screen display device. 4. The bus / DMA control unit transfers a data transfer unit that receives image data generated by the central processing unit to the display units, and transfers the image data transferred from the data reception unit to all display units. A multi-screen display control unit, a local bus interconnecting the multi-screen display control unit and the plurality of display units, and the multi-screen display control unit transfers image data to each display unit. In addition to performing the processing via the local bus, the processing processing notification signals output from all the display units are monitored, and the activation of the transfer of the image data to all the display units is controlled based on this. The multi-screen display device according to claim 1, wherein 5. Each of the display units further includes an inter-unit data transfer control unit for transferring image data subjected to arithmetic processing to and from another display unit, and the inter-unit data transfer control unit includes the local data transfer control unit. The image data that has been subjected to the arithmetic processing is transferred between the display units via the bus, and the display unit to which the image data is transferred has a function of generating a video signal based on the image data. The multi-screen display device according to claim 4, wherein the multi-screen display device is characterized in that: 6. A plurality of display means constituting the multi-screen are arranged closely so that an edge of the screen overlaps with an edge of a screen of an adjacent display means, and the inter-unit data of each of the display units is provided. The transfer control unit
Image data displayed in the overlapping area between another display unit where the edge of the screen overlaps,
The display units transfer the image data to each other via the local bus, and use the image data created by the display unit and the image data transferred from the other display unit for the overlapping area of the screen to interpolate the image data. The multi-screen display device according to claim 5, wherein the multi-screen display device is configured to perform the following.