JPS5828588B2 - Graphics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a raster scan type graphic display system.

Conventionally, this type of display method completely stores the image data for one side in a refresh memory, and then continuously reads the image data from the refresh memory in synchronization with the electron beam of the raster scan display device and performs D/A conversion. However, in order to display another image after displaying one image, a command to erase the refresh memory is required.

Therefore, there is a drawback that software developed for the normal random scan type graphic display method cannot be used without modification.

The present invention utilizes the natural reset of the memory to read image data from the refresh memory and at the same time refresh the image data representing the background color, brightness, or pattern in the sense of including colorlessness due to image erasure promised in advance in the word. By writing this including the meaning of the display image, it is possible to make the refresh memory erase command unnecessary or unnecessary when changing the display image, and to make it possible to treat it in the same way as a random scan type graphic display method. The purpose of this invention is to eliminate the above-mentioned drawbacks.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram showing a conventional raster scan type graphic display system.

The display processor shown in FIG. 1 is composed of a decoder for the input display command 1, a circuit for generating characters, straight lines, points, etc., and when the display command 1 is given manually, the display command 1 is written as An address VA representing the position on the display screen of each point of the displayed image, image data VD representing the color or brightness of that point, and a control signal C1 are input to the RAS type refresh refresh memory controller of FIG.

On the other hand, the raster controller in FIG. 4 sends a synchronization signal SYN to the raster scan display device 6, and also sends an address RA and a control signal C2 to the raster scan display device 6 in accordance with the position of the electron beam (RA S type').
Output to fresh memory controller 2.

Based on the signals from the RAS type refresh memory controller 2, the raster controller 4, and the display processor 1, the address of the refresh memory 3, M
A. Read/write control signal C1 Generates image data WD to control writing and reading of image data to and from the refresh memory 3.

Image data RD read from refresh memory 3
is temporarily stored in the D/A converter 5, converted into an analog signal, and then input to the raster scan display device 6, and the image stored in the refresh memory 3 is displayed on the raster scan display device 6. .

The above is an overview of the conventional raster scan type graphic display system. Image data once stored in the refresh memory 3 is not erased unless the refresh memory 3 erase command is issued. Normally, an instruction to erase the refresh memory 3 is required.

FIG. 2 is a block diagram showing a raster scan type graphic display system having a random scan function according to the present invention.

Compared to the one shown in FIG. 1, the background determination circuit shown in FIG. 2 is added, and the RAS type refresh memory controller shown in FIG. The memory controller has changed.

The operation is as follows.

8 in Figure 2 is a background determination circuit, which is a circuit that creates image data representing a background pattern including colorlessness due to image deletion, and the background is a single color, including colorlessness due to image deletion. Or, in the case of a single brightness, the image data CD representing that color or brightness is always RA
In this case, the connection between the raster controller 4 and the background determination circuit 8 shown in FIG. It is composed of a simple circuit in which a signal line for transmitting a CD is connected to a logical 1 level or 0 level to represent the color or brightness of the background.

On the other hand, when the background is a multicolored pattern, the background determining circuit 8 is configured to sequentially create image data CD representing the background based on the color signal RA of the raster controller 4.

The background determining circuit 8 can also be configured so that one of several types of backgrounds can be selected by a manual switch or a command from a computer.

The address VA of each point in the display image created by the RAN type refresh refresh memory controller and display processor 1, and the image data V representing the color or brightness of that point.
Based on D and the control signal C1, the RAS type refresh in FIG.
A write signal is sent as the image data WD and read/write control signal C, and the image data WD is written into the word corresponding to the address MA of the refresh memory 3.

On the other hand, when reading the image data RD from the refresh memory 3 based on the address RA and the control signal C2 from the USTAR controller 4, at the same time as the reading, the image data CD representing the background from the background determining circuit 8 is refreshed in the same word. The address MA, image data WD, and read/write control signal C are output to the refresh memory 3 so that the memory 3 can be written using its natural reset.

Therefore, the image data stored in the refresh memory 3 is stored at the address R from the raster controller 4.
At the same time, the image data CD representing the background of the background determining circuit 8 is read out based on the control signal A and the control signal C2.
Therefore, when displaying an image on the raster scan display device 6, the display command string describing the image can be repeatedly given to the display processor 1.

As a result, when changing the display image, it is only necessary to change the display command string given to the display processor 1, and a command to erase the refresh memory 3 is unnecessary, so that the function of an apparently random scan type graphic display method is provided. become.

FIG. 3 is a block diagram showing two embodiments of the RAN type refresh refresh memory controller of FIG. 2.

The read/write controller in Figure 11 uses the control signal C.
2 is given priority over the control signal C1,
When the control signal C2 comes, the address multiplexer in FIG. 10 and the data multiplexer in FIG. 9 select the address RA and the image data CD, respectively, and output the address MA and the image data WD to the refresh memory in FIG. , the read/write controller 11 sends a read signal as a read/write control signal C to the refresh memory 3, and after reading image data from the word corresponding to the address MA, sends a write signal as a read/write control signal C to write image data representing the background in the same word. Write WD.

On the other hand, when only the control signal C1 is input to the read/write controller 11, the address multiplexer 10 and the data multiplexer 9 select the address VA and the image data VD, respectively, and transfer the address MA and the image data WD to the refresh memory shown in FIG. At the same time, the read/write controller 11 writes the image data WD into the word corresponding to the address MA of the refresh memory 3 by sending a write signal as the read/write control signal C.

In this way, the RAN type refresh memory controller of FIG. 2 7 can be easily configured, but the read/write controller of FIG. 3 11 sends a write signal after sending a read signal to the refresh memory 3 based on the control signal C2. By configuring the system so that whether or not to send data can be switched using a manual switch or a command from a computer, it can be used as a conventional raster scan type graphic display system. It can also be used as a shape graphic display system.

FIG. 4 is a block diagram schematically showing a conventional random scan type graphic display system in order to explain that the conventional random scan type graphic display system can be replaced with the graphic display system according to the present invention. be.

The display command from the computer shown in FIG. 12 is given to the random scan display processor shown in FIG. 14 via the interface shown in FIG.
The image is displayed on the random scan display device shown in FIG. 16 via the D/A converter.

If the instruction set of the display processor shown in FIG. 2 1 is designed to include the instruction set of the random scan display processor shown in FIG. Can be replaced.

As detailed above, in order to display an image on a raster scan display device, when image data is read out from the refresh memory, the word also includes a pre-promised background that includes colorlessness due to erasure of the displayed image. By writing the image data to be represented, including the meaning of utilizing the refresh memory's natural reset, it is possible to configure a raster scan type graphic display method that has the function of a random scan display method. It has the advantage of being able to use the software developed for the shape graphic sales method as is, and is very effective in practical use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional raster scan type graphic display system, FIG. 2 is a block diagram of a graphic display system according to the present invention, and FIG. 3 is a block diagram showing an example of a RAN type refresh refresh memory controller. FIG. 4 is a block diagram of a conventional random scan type graphic display system. 1...Display processor, 2...
・RAS type refrefresh memory controller...
...IJ 7 Retrieval memory, 4... Raster controller, 5... D/A conversion 5.6...
...Raster scan display device, 7...R
AN type refrefresh memory controller...
- Background determination rotation, 9... Data multiplexer, 10 - Song address multiplexer 11...
Read/Write Controller, 12/Song/Calculator, 13...
...Interface, 14...Random scan display processor, 15...D/
A converter, 16°°°°° random scan display.

Claims (1)

[Claims] 1. A display processor is provided which has the function of decoding the code of a given display command and sequentially creating image data representing the address of each point on a display image and the color or brightness of that point, and then storing the display image. A refresh memory and a D/A converter for converting digital value image data read from the refresh memory into analog values are provided, and a raster scan display device is further provided for displaying the image stored in the refresh memory. A raster controller is provided, which is connected to the refresh memory via a D/A converter, and which stores the position of the electron beam of the raster scan display device. A RAN-type refresh memory controller that has the function of continuously reading image data from the refresh memory and the function of writing image data to the corresponding word of the refresh memory based on the address and image data created by the display processor. Sets the image displayed on the display device to be one in which the figure indicated by the display command is drawn on a background that is a pattern with a specific color or brightness, including colorlessness due to image deletion. , when reading image data from the refresh memory based on a signal from the raster controller, write image data representing the background in the same word, including the meaning of using the natural reset of the refresh memory at the same time as reading. The background is written by including a background determination circuit in another device or separately providing that function, and each word of the refresh memory from which image data is sequentially read out based on signals from the raster controller. By configuring the RAN type fresh memory controller so that the image data representing the background is stored until new image data is written by a signal from the display processor after the image data is read out. , when changing the display image, it is only necessary to change the display command string that describes the display image, and there is no need or need to use a refresh memory erase command. A graphic display method that has characteristics that allow it to be treated in the same way as a completely random scan type graphic display method.