JPS59119387A - Display indication control system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention is a display control method, particularly in a sequential scanning display device such as a CRT, in which a plurality of partial screens are displayed at arbitrary positions by allowing overlapping with priority. This invention relates to a display control method that makes it possible to

(B) Technical Background and Problems For example, there is a desire to be able to handle a plurality of partial screens on a CRT display by stacking them on top of each other or moving them around as if they were pieces of paper on a desk. For this reason, a method has been known in which nine partial screens are combined simultaneously with display on a CRT.

In this conventional method, in synchronization with the sequential display scan,
A partial screen is read out from the storage device in real time, parallel-to-serial conversion is performed, and a luminance signal to be sent to the CRT is created. However, according to this method, in the worst combination of display positions, it becomes necessary to read out all the partial screen information displayed on two screens simultaneously from the storage device, which requires an extremely high performance storage device. . Also.

The number of partial screens that can be displayed simultaneously is extremely limited. For example, video display processors that have been put into practical use using this method.

There is a restriction that only a maximum of four partial screens can be displayed on the same scanning line.

(Objective and Structure of the Invention The present invention aims to solve the above-mentioned problems, and places an excessive burden on a partial screen storage device in a device that combines and displays a plurality of logically independent screens on a screen. without any
It is an object of the present invention to provide a display control method that allows a practically sufficient number of partial screens to be displayed simultaneously.

Therefore, the display display control method of the present invention is as follows.

In a sequential scanning display device that compositely displays multiple partial screens having attributes such as information to be displayed, display position, size, and priority, it is equipped with multiple scanning line display buffers, and each means for determining the display position of the partial screen; and means for storing combined partial screen information reflecting the priority in the scan line display buffer that is not currently being displayed according to the display position determined by the determining means. The present invention is characterized in that the stored contents of the scanning line display buffer are displayed on the display. Embodiments will be described below with reference to the drawings.

(To) Embodiments of the Invention FIG. 1 shows an example of the display mode of a display screen related to the present invention, and FIG. The correspondence diagram, FIG. 3, shows the configuration of an embodiment of the present invention.

In the embodiment of the present invention described below, it is assumed that a maximum of 1024 points can be displayed on l scanning lines. In FIG. 1, a screen display is performed on one display screen DIP by sequential scanning by scanning lines S. Partial screens A, B, and C are partial screens each having rectangular display content, but 9 partial screens C
Since the partial screen B is placed above the 9th partial screen B and the partial screen A is placed above the 9th partial screen B, the 2nd partial screen B and part of the partial screen C are not displayed twice. If the arrangement of these partial screens A, B, and C is fixed,
An application e program or the like may create display data in which partial screens overlap from the beginning. However, in general, for example, moving partial screen A to display the previously hidden part of 9th partial screen B, or 2nd partial screen C
It is necessary to be able to freely and easily perform operations such as bringing the It would be desirable for the display control device or display device to automatically perform processing such as screen composition by simply specifying how to display the images.

Therefore, a plurality of pieces of partial screen information are stored in the two-part screen storage device and read from the partial screen storage device during two-part screen display. for example.

Assuming that one word, which is the unit of readout, has a 32-bit configuration, one scanning line displaying 1024 points consists of 32 words of information. Assuming that the maximum number of partial screens to be displayed is 16, according to the conventional method, it was necessary to read out information about all partial screens for each word of l scanning lines.

A total of 512 (=32×16) readings were required per one scanning line, and a corresponding reading performance of the partial screen storage device was required. However, in the case of the present invention, as will be explained below, even in the case of the worst overlap, the number of readings is increased by (number of partial screens x 2), that is, it can be processed with 64 (=32 + 16 x 2) readings. be made into

The information displayed by the scanning line S illustrated in FIG.
It is given by the word structure as shown in FIG. 1 word 3
With 2 bits, 32 words from the Oth word to the 31st bit correspond to one scanning line. For example, partial screen B starts with the first word and ends with the first word. However, on the 2nd display, the 2nd partial screen B is a shadow to the partial screen, so it starts with the 1st word, ends with the 1st word, starts again with the 1st word, and continues with the same 1st word.
Ends within a word.

If we look more closely at the first word, 9For example, as shown in the diagram,
The background is from the O-th bit to the 31st bit, and the (i-th
x+1) The area from the pit to the 31st bit is occupied by the information of partial screen B. Similarly, in the first word, the 0th bit to the 11th bit is partial screen A, the (A'1+1)th bit to the 12th bit is partial screen B, and the (lz+1th) bit is partial screen B.
) bit to the 13th bit is the partial screen C9th (13th
The background is from the +1) bit to the 31st bit. As can be seen from Figure 2, the information actually displayed requires multiple screen information only for words that include double ends.
For words other than the i-th word, j-th word, second word, and first word shown in FIG. 2, a single screen information may be used. The present invention focuses on this point and is designed to reduce the total number of readouts for displaying one scanning line.

FIG. 3 shows the configuration of an embodiment of the present invention. In the figure.

1 and 2 are scanning line display buffers, 3 is a display timing control unit, 4 is a parallel-to-serial conversion circuit, 5 is a display control processor, 6 is a partial screen information memory, 7 and 8 are registers,
9 represents a shift/merger circuit, and 10 to 13 represent switches.

The scanning line display buffer l and the scanning line display buffer 2 are
Each buffer has a capacity of 32 words with 32 bits per word. These buffers 1. 2 by switches lo to 13 that operate in conjunction.

It is used alternately as a buffer for display or for configuring display information. For example, in the switch state shown in FIG. 3, scan line display buffer 1 is used for display, and scan line display buffer 2 is used for configuring display information. When the writing to the scanning line display buffer 2 is completed and the contents of the scanning line display buffer 1 are displayed for one scanning line, the switches 10 to 13 are switched, and the scanning line display buffer 2 is used for display, and the scanning line display buffer l is used to configure display information for the next scan line.

The display timing control unit 3 outputs the currently scanned scanning line number and address information for the buffer 1 or 2 used for display. The address information of the display timing control section 3 is transmitted through 2, for example, a signal line 26. Switch 11. Via the signal line 24, the scanning line buffer l
transmitted to.

The word corresponding to that address is read out and the output line 20
．． Switch 10. Display information is supplied to the parallel-serial conversion circuit 4 via the wiring 22. The parallel-serial conversion circuit 4 has 3
The 2-bit parallel display information is serialized and sent to the CRT as a luminance signal to perform two displays.

The display control processor 5 is a high-speed processor controlled by a microprogram, and configures scanning line display information. By signal line 33.

When the scanning line number is received from the display timing control unit 3, it is 9.
Begins configuring the next scan line display information. The display control processor 5 internally stores information regarding the existing position of the partial screen in each scanning line, or determines the scanning line to be constructed in the 9th order based on the existing position information for each partial screen given in advance. Generates information about the location of the partial screen in .

Based on the information, a read signal to the two-part screen information memory 6 is outputted by signal line drawing.

The partial screen information memory 6 contains the contents of all partial screens that are to be displayed by the display request source.

The display position on the display screen, information regarding the thickness, display priority, etc. are stored in advance. Partial screen information is read word by word from the two-part screen information memory 6 in response to a read signal from the display control processor 5, and is set in the register 7 via the data line 32. If the word read into register 7 suffices for a single partial screen information, shift/merge circuit 9. Data line-30, switch 13. Via the data line 29, it is written into the scanning line display buffer 2, which is currently used for configuring display information. The starting position of the 2-part screen is: 1
if it does not match a word boundary.

The contents of the register 7 are shifted by the shift/merger circuit 9, stored once in the register 8, combined with part of the secondary word, and sequentially output to the scanning line display buffer 2. The address for the scanning line display buffer 2 is transmitted from the 9 display control processor 5 to the signal line 27. Switch 12.
It is given through signal line 25.

For example, for the i-th word shown in FIG. 2, the background is from the O-th bit to the 11th pit.
Partial screen B is from the (tx+1)th bit to the 31st bit. Therefore, in processing the first word, first, the result of writing the background is stored in the register 8 via the shift φ merging circuit 9, and then the information on the partial screen B is read out from the partial screen information memory 6. Make the necessary shifts.

The data is merged with the contents of the register 8 and written to the scanning line display buffer 2. In this case, one word is actually written by two readings.

Regarding the first one shown in FIG. 2, the background 2 partial screen C2 partial screen B2 partial screen A are similarly used.

The four pieces of information are merged and then written to the scanning line display buffer 2. The order in which information is merged depends on the vertical relationship of the partial screens, and according to the display priority.

Merging is performed in order from the bottom. This allows the 9-overlap relationship to be displayed correctly.

Scan line display information is created by reading the number of words of the information actually displayed plus the number of words read out for overlapping processing at both ends of each partial screen. . Therefore, according to the present invention, nine overlapping processes can be performed for one scanning line by only accessing the memory as many times as the number of display words of one scanning line plus twice the number of partial screens.

According to the present invention, as described in detail in (1) above, according to the present invention, (1) per scanning line, in addition to the amount of display information of the number of bits included in one scanning line, 9 times the number of partial screens to be displayed, which is the unit of overlapping processing; It is possible to display a partial screen with double overlap simply by reading the information of the double word from memory.

Compared to the conventional method, it is necessary to read out from memory the number of partial screens times the display information amount of one scanning line.

Very efficient display control becomes possible. Therefore.

It becomes possible to use a small-scale, low-speed partial screen information memory, and the restriction on the number of 9 partial screens can be significantly relaxed.

[Brief explanation of drawings]

FIG. 1 is an example of a display mode of a display screen related to the present invention, FIG. 2 is an explanatory diagram of the correspondence between the word structure of scanning lines that display a part of the display screen shown in FIG. 1 and a partial screen, and FIG. The figure shows the configuration of an embodiment of the present invention. In the figure, 1 and 2 are scanning line display buffers, 3 is a display timing control unit, and 5 is a display control processor. 6 is a partial screen information memory; 7 and 8 are registers. 9 represents a shift/merging circuit, and IO to 13 represent switches. Patent applicant Fujitsu Limited

Claims (1)

[Claims] In a sequential scanning display device that compositely displays a plurality of partial screens having attributes such as information to be displayed, display position, size, and priority, it is equipped with a plurality of scanning line display buffers and means for determining the display position of the partial screen; and means for storing combined partial screen information reflecting the priority in the scan line display buffer that is not currently being displayed according to the display position determined by the determining means. . A display display control method characterized in that the stored contents of the scanning line display buffer are displayed on a display.