JPH06289844A - Graphics display - Google Patents

Abstract

(57) [Summary] [Object] To provide a graphics display device capable of connecting a plurality of display devices of different standards with respect to a graphics display device which receives graphics definition data from the outside and performs graphics display. A transfer surface 30 having a temporally multiplexed frame surface receives graphics information from the outside and stores it. The display surface 40 synthesizes the graphics information from the transfer surface and sends the synthesized graphics information to the video section 50, while converting the synthesized graphics information into a video signal and sends it to the display device 21. The video unit 50 has a double buffer structure including two memories 50a and 50b. The composite graphics information is read into one of the memories, the composite graphics information already read from the other is read, and converted into a video signal for display. To the device 22. By changing the read speed at this time, the display device 21 and the display device 22 having a different standard can be connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphics display device for receiving graphics definition data from a workstation or the like and performing graphics display.

In order to perform advanced graphics display on a workstation or the like, graphics information is generated from image data by a graphics display device and displayed on the display device.

[0003]

2. Description of the Related Art On the other hand, in graphics display on a workstation, not only is it displayed on a workstation display, but it is also displayed on a normal NTSC television for presentations, or NTS.
The demand for recording on a VTR for C is increasing.

[0004]

[Problems to be Solved by the Invention] However, general NTS
A television for C or the like has interlaced scanning, or the standard of the density of the display screen, the number of display screens per second, etc. is different from that of the workstation display.

A conventional graphics display device is generally capable of displaying only one of a display for workstations and a television for NTSC. There is also a graphics display device capable of simultaneously connecting a work station display and an NTSC television, but two graphics display control circuits of different standards are provided, and the number of parts is large and the cost is high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a graphics display device having a simple circuit configuration and capable of simultaneously connecting and displaying a display for workstation and a television for NTSC. .

Another object of the present invention is to provide a graphics display device capable of switching and displaying either a workstation display or an NTSC television.

[0008]

FIG. 1 is a principle diagram of a graphics display device of the present invention. The graphics display device receives graphic definition data from the outside, generates graphics information, stores the graphics information in a frame memory, and outputs a video signal to the display device.

The graphics display device receives the graphics information from the frame memory, synthesizes the transfer surface 30 to be stored in the temporally multiplexed frame surface, and the graphics information from the transfer surface 30, and synthesizes the first synthesized graphics. The display surface 40, which outputs the first combined graphics information as information, and outputs the first combined graphics information as the first video signal, the first display device 21 that displays the first video signal, and the first combined graphics information. A video unit 50 that converts the second combined graphics information having a transfer rate and outputs the second combined graphics information as a second video signal; a second display device 22 that displays the second video signal; It consists of

[0010]

The transfer surface 30 receives the graphics information from the frame memory and stores it in the frame surface. The display surface 40 combines the temporally multiplexed graphics information of each frame surface and outputs the combined graphics information as first combined graphics information.
In addition, the display surface 40 displays the first composite graphics information as the first composite graphics information.
Is output as a video signal of and is displayed on the first display device 21. For example, the first display device 21 is connected to a workstation display. The video unit 50 converts the first graphics information into second composite graphics information having different transfer rates, and outputs the second composite video information as a second video signal.
It is displayed on the second display device 22. For example, a television for NTSC is used as the second display device. With such a configuration, graphics can be displayed on the display devices 21 and 22 having different standards.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an overall configuration diagram of a graphics display device including a workstation. The graphic definition data is sent from the workstation 1 to the graphics display device 10. Here, the figure definition data is the character to be displayed,
Although it is data including information such as figures or their positions, it is not in a format that can be displayed as it is on a display device.

The graphics display device 10 receives the graphic definition data, generates displayable graphics information, and further converts the graphics information into a video signal,
It is displayed on the display devices 21 and 22.

The graphics display device 10 includes a CG (computer graphics) control unit 11, a CG generation unit 12,
Frame memory for 3D data drawing (3D-FM) 1
3, the display control unit 14.

The CG control unit 11 receives the graphic definition data from the workstation 1 and sends it to the CG generation unit 12.
Further, the CG control unit 11 controls the transfer of data in the entire graphics display device 10.

In the CG generator 12, from the graphic definition data,
The graphics information, that is, the doddle data of the display image is generated and sent to the three-dimensional data drawing frame memory 13. For example, when the graphic definition data is a character, character dot data is generated from the built-in character generator and output. When the graphic definition data is a line such as a straight line, dot data of a straight line having a designated position, length and inclination is generated and output.

The three-dimensional data drawing frame memory 13 is a frame memory that can also store the depth value of each pixel. The three-dimensional data drawing frame memory 13 is, for example,
It is configured as a memory having dot data of 1280 pixels in the horizontal direction and 1024 pixels in the vertical direction and a depth value of each pixel.

The display control unit 14 reads out a frame memory to be displayed from the three-dimensional data drawing frame memory 13, synthesizes the contents of the temporally multiplexed frame memory, and outputs it as a video signal corresponding to the display device. .

For example, the display device 21 is a work station display, and in continuous scanning, the number of pixels in one screen is 1280 × 1024, and the screen is switched at a speed of 76 sheets per second. On the other hand, the display device 22 is an NTSC television, and the number of pixels in one screen is 640 × 480 by interlaced scanning, and the screens are switched at a speed of 60 sheets per second.

FIG. 3 is a diagram showing details of the display control unit 14. The display control unit 14 includes a transfer surface 30, a display surface 40, and a video unit 50. The function of each unit is as described in FIG. The transfer surface 30, the display surface 40, and the video unit 5
The transfer of graphics information between 0s is executed by a control unit (not shown). Since the control unit merely controls the transfer of data, its details are omitted.

The transfer surface 30 is composed of a dual port RAM including a memory cell 31, a serial port 32 and a parallel port 33. The graphics information from the frame memory 13 for three-dimensional data drawing is the serial port 3
2 is input and stored in the memory cell 31. Also,
The graphics information is output from the parallel port 33.

The display surface 40 is composed of a dual port RAM including a memory cell 41, a serial port 42 and a parallel port 43. Further, it has a video signal conversion circuit 46 for converting graphics information into a video signal.

First, the graphics information from the parallel port 33 of the transfer surface 30 is stored in the memory cell 41 via the parallel port 43. Further, they are combined in the memory cell 41 and sent as combined graphics information from the serial port 42 to the video section 50. Further, the composite graphics information is converted into a video signal by the video signal conversion circuit 46 and displayed on the display device (workstation display) 21. Therefore, the transfer rate from the serial port 42 is a rate corresponding to the workstation display.

Here, an example of the graphics information in the transfer surface 30 and the composite graphics information in the display surface 40 will be described. FIG. 4 is a diagram showing an example of graphics information and composite graphics information. Graphics information is transferred from the three-dimensional data drawing frame memory 13 to the transfer surface 30. Here, the three-dimensional data drawing frame memory 13
The figure drawn on the screen changes from moment to moment, and the transfer surface 3
By multiplexing 0 in time, for example, 37a, 37b
The two images are sequentially sent to the transfer surface 30. The frame surfaces 35a and 35b are a schematic representation thereof. Here, the graphics information 37a is transferred to the frame surface 35a, and the graphics information 37b is transferred to the frame surface 35b. That is, the transfer surface 30 thus has a function as a relay surface when transferring the graphics information.

Then, these graphics information 37
The characters a and 37b are sent to the display surface 40 and, at the same time, are combined as one piece of combined graphics information 45. This serves the function of multiple windows.

Returning to FIG. 3, the details of the display controller will be described. The video unit 50 has two dual ports: a memory cell 51a and a serial port 52a and a dual port RAM including a parallel port (not shown) and a memory cell 51b and a serial port 52b and a dual port RAM including a parallel port (not shown). It has a RAM. These two dual port RAM
Is configured as a double buffer. In order to switch this double buffer, serial ports 52a, 5
The switching circuit 54x is connected to the input side of 2b, and the switching circuit 54y is connected to the output side. Also, the switching circuit 5
A video signal conversion circuit 56 for converting the composite graphics information into a video signal is connected to 4y, and the output thereof is connected to the display device 22.

The composite graphics information from the serial port 42 is input to the switching circuit 54x. Here, the switching circuit 54x is connected to the side indicated by the solid line, and the combined graphics information is stored in the memory cell 51a via the serial port 52a. On the other hand, the switching circuit 54y is also switched to the side shown by the solid line, and reads the previously loaded composite graphics information in the memory cell 51b and outputs it to the video signal conversion circuit 56. Next, the switching circuits 54x and 54y are switched to the side indicated by the dotted line, and the combined graphics information from the serial port 42 is passed through the serial port 52b to the memory cell 5
Input to 1b. Then, the combined graphics information stored in the memory cell 51a is output from the switching circuit 54y to the video signal conversion circuit 56. That is,
The synthetic graphics information is read into one of the memory cells 51a and 51b, and the synthetic graphics information is read out from the other. Therefore, if the read speed is changed, the transfer speed from the switching circuit 54 can be changed.
That is, if the display device 22 is an NTSC television, the transfer rate is changed to correspond to this.

If the transfer rate is changed, the display device 22
It is also possible to switch between an NTSC television and a workstation display.
Although the dual port RAM is used as each memory in the above description, it goes without saying that another memory having a function equivalent to these can be used. For example, a shift register can be used instead of the dual port RAM of the video section 50.

Although the display device 21 is a workstation display and the display device 22 is an NTSC television, other display devices such as a liquid crystal device may be used.

[0029]

As described above, according to the present invention, the transfer surface, the display surface, and the video section are provided so that the transfer rate of the composite graphics information can be converted by the video section. Equipment can be used.

Since the graphics information is once received on the transfer side and is combined on the display side, the graphics information from the frame memory for drawing three-dimensional data is combined to execute the multi-window function. You can

[Brief description of drawings]

FIG. 1 is a principle diagram of a graphics display device of the present invention.

FIG. 2 is an overall configuration diagram of a graphics display device including a workstation.

FIG. 3 is a diagram showing details of a display control unit.

FIG. 4 is a diagram illustrating an example of graphics information and combined graphics information.

[Explanation of symbols]

1 workstation 10 graphics display device 13 three-dimensional data drawing frame memory (3D-F
M) 21 display device 22 display device 30 transfer surface 40 display surface 50 video section

Claims (11)

[Claims] 1. A graphics display device that receives graphics definition data from the outside, generates graphics information, stores the graphics information in a frame memory, and outputs a video signal to a display device, wherein the graphics from the frame memory is used. Receiving the information,
Transfer plane (3
0) and the graphics information from the transfer surface (30) are combined and output as first combined graphics information, and the first combined graphics information is output as a first video signal, and a display surface (40). A first display device for displaying the first video signal (2
1) and a video section (50) for converting the first combined graphics information into second combined graphics information having another transfer rate and outputting the second combined graphics information as a second video signal. , A second display device for displaying the second video signal (2
2) A graphics display device comprising: 2. The transfer surface (30) is composed of a dual port RAM having a serial port and a parallel port, and the graphics information from the frame memory is input from the serial port and output from the parallel port. The graphics display device according to claim 1, wherein the graphics display device is configured. 3. The display surface (40) is composed of a dual port RAM having a serial port and a parallel port, the parallel port receives the graphics information from the transfer surface (30), and the first graphics is received. The graphics display device according to claim 1, wherein the graphics information is configured to output composite information from the serial port. 4. The video section (50) has a double buffer memory configuration (50a, 50b), the composite graphics information is written in one buffer memory, the composite graphics information is read from the other buffer memory, and this is alternated. Switching means (54) for repeating
The graphics display device according to claim 1, further comprising: 5. The double buffer memory is composed of a dual port RAM having a serial port and a parallel port, and the composite graphics information is input and output from the serial port. Graphics display device. 6. The switching means (54) comprises a first switching circuit provided on the input side of the serial port and a second switching circuit provided on the output side of the serial port. 5. The graphics display device described in 5. 7. The graphics display device according to claim 5, wherein the double buffer memory comprises a shift register. 8. The graphics display device according to claim 1, wherein the first display device (21) is a display for a workstation. 9. The second display device (22) is NTSC.
The graphics display device according to claim 1, wherein the graphics display device is a television of a system. 10. The graphics display according to claim 1, wherein the video rate is variable so that either an NTSC television or a workstation display can be connected. apparatus. 11. The graphics display device according to claim 1, wherein the frame memory is a three-dimensional data drawing frame memory.