JPS58146931A - Display - Google Patents

Abstract

PURPOSE:To shorten response at the change of a part of a picture, by rewriting only the contents of a memory block in which data corresponding to the place to be changed are stored and transferring and processing the rewritten contents. CONSTITUTION:In a case (b) that the data volume of a part (oblique line part from the upper right to the lower left) to be changed on a screen is less than data stored in the 2nd block 10 of an internal memory 3 of a host computer, the data of the changing part are stored in the 2nd block 10, the part correspondtion to the difference from the preceding data is erased and the whole 2nd block is sent to a buffer memory 4 together with the block number. The buffer memory 4 discriminates the sent block number and stores the data in the 2nd block. A picture processor 5 discriminates the block number, processes the data of a necessary block in the buffer memory 4 and stores the processed data in a corresponding block in the refresh memory.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device that displays graphics or characters using data sent from a host computer.

In conventional display devices, when a part of the image being displayed is to be redrawn, all data necessary for display, including the portion that will not be redrawn, is reconfigured in the host computer and sent to the display device's buffer memory. Was. The display device that has received the cough data uses the image editing processor to perform scaling, movement, and movement on portions of the buffer memory that are unchanged from the previous image, as well as when displaying a completely different image. Perform transformations such as rotation,
Since the data is stored in the refresh memory, the responsiveness decreases when a part of the image changes rapidly, and the image editing processor has the disadvantage of being burdened unnecessarily.

An object of the present invention is to reduce the amount of data transferred between a host computer and a display device when changing a part of the screen being displayed, and at the same time reduce the internal processing of each of the host computer and display device. An object of the present invention is to provide a display device that improves responsiveness.

Memory area within the host computer that stores edited image data? The buffer memory in the display device corresponding to the memory area is also divided into n blocks, and the refresh memory has a size corresponding to one block of the buffer memory.
Divide into n blocks. When redrawing a part of the screen that is currently being displayed, only the data necessary for redrawing is edited in the host computer and stored in the corresponding memory block, and then the data in which the edited data is stored is The contents of the memory block are sent to the buffer memory with data indicating the number of the corresponding block in the buffer memory in the display device. When data is stored in the block specified by the block number, the image processing processor performs the necessary processing vt only on the specified block. Store data in the corresponding block of refresh memory. When redrawing a part of the screen using the above method, only the block corresponding to the change is edited in the host computer, and only the corresponding block and block number are transferred from the host computer to the backup memory of the display device, and the image processor Processing and transfer to the refresh memory need only be performed for the relevant block and block number.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a block diagram showing the basic configuration of a display device according to the present invention. In FIG. 1, a display device 2 is connected to a host computer 1, and image data edited by a program of the host computer 1 and stored in an internal memory 3 of the host computer is displayed on the display under the control of the program. The data is transferred to the buffer memory 4 of the device 2. The data in the buffer memory 4 is reduced by the image processing processor 5.

Processing such as enlargement 9 rotations and movement is performed, and the result is ”
The data is stored in the refresh memory 6. The graphic character generating circuit 7 reads out the contents of the refresh memory 6 at a fixed period (refresh cycle) and displays the figures or characters corresponding to the contents on the display section (CRT). Internal memory 5 of the host computer explained in FIG. 1 above. As shown in FIG. 2, the buffer memory 4 and refresh memory 6 are each divided into n blocks. That is, the internal memory 3 of the host computer is stored in the first block 9. Second block 10, fifth block 11. The fourth block 12 is divided into n-th blocks 13, and the buffer memory 4 and refresh memory 6 are similarly divided into n blocks. Data stored in the first block 9 of the internal memory 3 of the host computer is transferred to the first block of the backup memory 4 and further stored in the first block of the refresh memory 6. Similarly, it is assumed that data in each block of the internal memory 3 of the host computer is stored in blocks with the same number in each of the buffer memory and refresh memory. The internal memory 5 of the host computer stores the image data edited by the program on the display device 2.
Since the backup memory 4 is a buffer area for temporarily storing data received from the host computer, it generally has the same capacity.

The refresh memory is the processing fM of the image processing processor 5.
Since this is an area where the results after passing through are stored, the capacity generally does not match that of the internal memory 3 and buffer memory 4 of the host computer.

Next, the operation of the display device according to the present invention will be explained using FIG. , FIG. 3(a) shows the movement of data in each memory when the entire screen that is already displayed is to be redrawn. In the figure, the image data edited by the program of the host computer 1 is stored in diagonal lines (from top left to bottom right) of the first block 9 and second block 1o, and each block (including blank areas) is stored in the buffer. First block 14 and wc2 block 15 of memory 4
After being processed by the image processing processor, it is stored in the first block 19 and second block 2o of the refresh memory 6, and display is performed according to the contents of the fresh memory 6. Figure 1 (b) and (
This is explained by C). It is assumed that the part of the screen to be changed corresponds to the data stored in the second block 10 of the internal memory 3 of the host computer.
If the amount of data in the diagonal line (from upper right to lower left) is smaller than the data stored in At the same time, the data is stored in the block 10, the difference from the previous data indicated by the diagonal line (upper left to lower right) is erased, and the entire second block is sent to the buffer memory 4 together with the block number. The buffer memory 4 determines the sent block number and stores the data in the block (second block 15) of the packer memory 4 that matches the designated number. The image processor 5 also determines the block number, processes the data of the necessary blocks in the buffer memory 4, and stores it in the corresponding block of the refresh memory. As shown in FIG.
! (from upper left to lower right), if there is more rewritten data shown in the diagonal line (from upper right to lower left), and if all the rewritten data falls within the second block 10, the second
The block and block number may be transferred to the second block 15 of the pack memory 4, but if the data to be rewritten does not all fit into the second block 10, the overflow data may be transferred to an unused block, for example, the n-th block 13. Similarly to the second block 10, a block number is added and sent to the pack memory 4.

As described above, according to this embodiment, when changing a part of the screen being displayed, only the contents of the corresponding memory block are changed and internal processing is performed, resulting in a highly responsive display. There is an effect that can be obtained.

Next, the present invention will be explained in detail based on the relationship with actual images.

FIG. 4 is a diagram showing the relationship between the display image on the CRT screen and each memory block. The main memory 5 of the host computer is divided into n blocks, each block having a power of 100W.
It has a capacity of The display information in each block of the main memory 5 is edited by a program and is logical data. Similarly, the pack memory 4 is divided into n blocks, and each block has a capacity of 100W. The main memory S and buffer memory 4 are completely one-to-one.
There is a correspondence relationship. The refresh memory 6 is divided into n blocks, and each block has a g amount of 150W. This data is created by each data company's internal processor 5 in the refresh memory 6, and this data is physical data obtained by converting the logical data in the buffer memory 4 for t-CRT display.

In order to display on the display screen at-CRT shown at the right end,
The first block is for "Title text", the second block is for "Graph work", the third block is for "Graph plots and curves", and the fourth block is for "Graph work".
Set for "vector" display. Below, division is performed as necessary.

Next, the contents of each block of each memory will be explained using the fourth block as an example. Figure 5(a) shows the fourth section of the main memory.
An example of block data structure is shown below. Addresses are expressed as relative addresses, where addresses 0 and 1 indicate data examples related to vector A in FIG. 4, and addresses 2 and 3 indicate data examples related to vector B. Address 5 indicates the jump destination address for jumping to the top of the fifth block. Note that the starting point and ending point of addresses 1 and 5 are indicated by logical coordinates, such as latitude and longitude, or normalized coordinates.

FIG. 5(b) shows the data structure of the fourth block of the refresh memory, and is indicated by a relative address of 100w. This value of 150W is determined based on the conversion efficiency between logical data and physical data. Addresses 0-5 are vector A
Addresses S to 5 indicate information regarding vector B. Furthermore, address 6 stores the jump destination address to the first address of the fifth block.

A comparison will be made with 70-Chart 1-Conventional Example in which only the vectors A and B displayed on the CRT in this data structure are changed. FIG. 6 shows a flowchart in the case of the conventional example without block division, and FIG. 7 shows a 70-chart in the case of block division according to the present invention. Comparing both figures, the processes of creating position information for vector change on the display device side and sending the position information to the host computer side are the same in both figures. The difference lies in the subsequent processing. In the conventional example, when a change instruction is given, the entire display information is re-edited after calculating the starting point and ending point of the vector in the coordinate system of the program. In this embodiment, re-editing is performed in blocks rather than in whole. Furthermore, when sending the edited data to the display device after re-editing, in the conventional example, it is necessary to transfer all the data, that is, 100 nW, but in this embodiment, the 100 W regarding the fourth block is required.
Only. Furthermore, on the display device side that receives the re-edited data, in the conventional example, it is necessary to process the entire screen and convert it into physical data (
In this embodiment, only the fourth block is processed and converted into physical data. Next, there is also a difference in transfer to the refresh memory between the whole and the block. FIG. 8 shows an example of the structure of data before and after re-editing in the main memory in this embodiment. In the figure, M is an additional item and the value after changing NFi.

FIGS. 9(&) and 9(b) show a comparative example of re-editing data in the main memory between the conventional example and this embodiment. M indicates additional information, and P indicates the symbol code and position. Furthermore,
B5, B4, B5 indicate block 5.4.5t.

The figure (a) shows the conventional example, and the figure (b) shows the present embodiment. Now,
When adding an arrow display to the beginning of vector A, in the conventional method, it is added to the - memory location, so the addresses of subsequent data will be shifted. Therefore, if the amount of data changes due to additions or changes, the entire display information must be reorganized. On the other hand, in the case of the method according to the present invention, only the fourth block needs to be reorganized.

In this embodiment, the process of arrest, F5, and F4 (host computer
The target p>o is "/n (100nW → 100W), and the transfer time of display information between the host computer and the display device is also /nK. Also, within the display device, the data conversion processing target of the built-in processor and The transfer to the refresh memory is also reduced to 1/n.Therefore, the screen response to operator operations becomes faster.In particular, overshoot can be prevented when continuous operations are performed.

According to the present invention, when a part of the screen is changed, only the contents of the memory block storing the data corresponding to the changed part are rewritten, transferred and processed. This has the effect of shortening the response time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of a display device according to the present invention, and FIG. 2 is a diagram showing the internal memory of the host computer, the buffer memory and refresh memory of the display device, and their respective n divisions and their correspondence.
FIG. 5 is a diagram showing an example of changes in the contents of each memory when a part of one page is redrawn, FIG. 4 is a diagram explaining each memory division in a specific display example, and FIG. ), (b)
is a diagram showing the data structure corresponding to the fourth block of the memory, FIG. 6 is a conventional flowchart, FIG. 7 is a 70-chart in the embodiment of the present invention, and FIG. FIG. 9(a) is a diagram illustrating the and the rear. (b) is a comparison diagram of data in the main memory between the conventional example and the present example. DESCRIPTION OF SYMBOLS 1...Host computer, 2...Display device, 5...Internal memory of host computer, 4...
・Backup memory, 5...1 my processing processor, 6.
...Refresh memory, 7...Graphic character generation circuit,
8...Display section. Agent Patent Attorney Tadashi Akimoto Figure 1 Figure 2 Figure 3 (a)

Claims (1)

[Claims] In a display device connected to a host computer to display images, a buffer memory temporarily stores logical data for display from the host computer;
an image processing processor that converts the logical data stored in the buffer memory into physical data; a refresh memory that stores the proboscis data processed by the processor; and an image processing processor that converts the logical data stored in the buffer memory into physical data; It consists of a graphic character generation circuit that generates signals for display graphics, a display section that displays images based on the signals of the graphic character generation circuit, and a main memory in the host computer, the buffer memory, and an overlay. A display device in which a memory is divided into n blocks with respect to an information area for display, and processing such as changing, modifying, adding, deleting, etc. of the screen being displayed is performed for each block.