JPS5923380A - Display 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 (a) Technical Field of the Invention The present invention provides a designated field 1 on a display screen for displaying multiple sentences.
The present invention relates to a display gray display device displayed on a 5i, and particularly to a control method when a plurality of sentences are displayed in a heavy manner.

(b) Prior art and problems When displaying text on the display screen, display i Yi! There is a request to display the text of the number of simultaneous VC Kaede on the ii side. FIG. 1 shows an example of displaying a plurality of sentences. Sentence 1, Sentence 2, and Sentence 3 are displayed on display surface 1. This means using a display device to create an image of writing sentences on paper and placing them on a desk. FIG. 2 shows an example of a conventional technique for realizing the display shown in FIG. FIG. 2 is a block diagram of the circuit of the display device. Processor 2 controls the operation of the entire display device. The memory 3 stores a groogram for controlling the operation of the tJ, 7D processor 2 and display data as shown in FIG.

Processor 2 switches multiplexer 5 to connect address path ABUS to character buffer 6, and stores data for one screen in character buffer 76 via memory 3 and data path DBUS. Processor 2 switches multiplexer 5 to connect character buffer address MA of control section 4 to character buffer 6, and causes control section 4 to display characters on indicator section 6. The control unit 4 sends the character generation circuit 7 to line a,
The address RA is sent to the video control unit 9 as a horizontal and vertical synchronizing signal VS.
The character code CD of one display screen sent from the character buffer 6 and the dot pattern of the character sent from the character generation circuit 7 are converted from parallel to serial using the character code CD and the line address RA. The circuit 8 sends the υ serial signal to the video control section 9, and in synchronization with the horizontal and vertical synchronizing signal ■S, the dot data of the character padding is sent to the display section 10 KN.
Let me show you.

FIG. 3 shows an example of the configuration of one screen of the display.

In this example, 80 characters per line, 25 lines, 1 to 2000, immediately 3rd
The character code corresponding to each character on the screen shown in the figure is stored. If an EBCDIC code is used as a character, one character is represented by an 8-bit code, so the capacity of the character buffer 6 is 8 bits) x 2000.

FIG. 5 is a diagram illustrating character patterns. Here -
It is assumed that the character pattern for each character is represented by 8×8 dots. The character generation circuit 7 is addressed by the character code CD of the character buffer 6 and the row address RA of each character pattern, and 8-bit data in one horizontal row of the character pattern is simultaneously read out from the character generation circuit 7.

111f using the conventional display device as described above.
When performing split screen control to display an image as shown in 'lK, the processor 2 writes the text data for text l and text 3 in the memory 3 to the address of the character buffer 76 corresponding to the position on the display surface 1. . Since a part of sentence 2 is under sentence ':N1, the processor 2 uses 10 grams to find the tηυ match, finds only the parts of sentence 20 that do not overlap, and stores 1 in the character buffer 6. Therefore, as the number of sentences to be displayed increases, it becomes difficult to calculate the p-match, which has the drawback of deteriorating the performance of the display device.

(e) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks by not making the processor calculate overlapping sentences, but by giving priority to the entries in the character buffer, and adding new characters to the character buffer. When cutting, the usage order of character buffer entries and new K
Compare the priority of the new character with the priority of the new character, and when the priority of the new character is greater or equal, the character is assigned 'rIJ'.
The purpose of the present invention is to provide a display control method that lightens the burden on a processor by updating data in a timely manner, and not writing data and not performing a data history 1i when it is too late.

(d) Composition of the invention Is the composition of the present invention composed of multiple sentences j? In a display device that displays C at a specified location on the display surface, a priority order is determined between sentences to be displayed, a priority order is set for each entry in a character buffer according to the priority order, and a new character is added to the character buffer. When writing, compare the priority of the entry in the character buffer with the priority of the read text of the character to be newly written, and if the priority JA rank of the character to be written in the rib is equal or higher, the priority of the entry in the character buffer is 17 is written, the lower platform is not written, the original character is controlled to remain, and if the usage order of the newly written character is no throw low, the entry of the character buffer is (Priority) 11 It is possible to enter into the 11th grade regardless of the rank.

(e) Implementation of scope 1] FIG. 6 is a circuit diagram showing an embodiment of the present invention.

In addition to the 8-bit code for fitting a character into the character buffer 6 shown in FIG.
) Provide an X section. Therefore, the character buffer 6 has a different content 2- from that in FIG. 4, which is 11 bits x 2000. Also provided are a register 12 for temporarily storing the address of a character buffer, a register 11 for temporarily storing display data from the memory 3, and a comparator 13 for comparing the priorities of sentences. register 11
is an 11-pit register with an 8-bit character code and a 3-pit PY section that determines the priority of the text. In this example, the priority of the text is set to 8 levels, but depending on the number of pits representing the priority, It is possible to change the number of levels. When the address of the character to be written into the character buffer 6 by the processor 2 is set in the register 12 and that character is set in the register 11, the address V of the register 12 is set.
The code of the character buffer 6 specified by Koyoshi and the PX indicating the priority of the character are output for 1 cm, and the PX therein is sent to the comparator 1.
Add to 3. At the same time, PY in register 11 is also added to read comparator 13. At this time, if PY≧l)X, (is comparator 1
3 and character buffer 76 as register 1 as BJ function
The code 1 and the data PY are written to the character buffer 6 and the data is updated. If py<px, convolution of the character buffer 6 is disabled and data is not updated. However, only when PY is 3j+, which is 0 and indicates the lowest level, writing to character buffer 6 is enabled and data is changed a1.
Do this. This is a necessary operation when clearing the character buffer 6. The text priority is set to memory 3 in advance.
It is determined when the

(f) As described in the detailed description of the invention, the present invention allows the priority of the displayed sentences to be determined in advance, so that there is no need for the IrX 7' processor to calculate the number of overlapping sentences, and the 9! Since overlapping combinations can be determined by hardware simply by comparing priorities using a comparator, the processor's negative phase '? It is possible to reduce the processing power of the display device by reducing the L value.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the display of multiple sentences, i1' (Fig. 2 is a diagram showing the configuration of the display device 0 circuit, Fig. 3 is a diagram showing an example of the configuration of both sides of the display device 1, and Fig. 4 is Figure 3 1
Figure 5 shows an example of the configuration of a character buffer that stores a screen worth of data.
1 is a circuit diagram showing an example of the present invention. 1 is a display screen, 2 is a processor, 3 is a memory, 4 is a control unit, and 51- .1.'Multiplexer, 6 is a character buffer, 7ti character generation circuit, 8 is a parallel-to-serial conversion circuit,
9 (d video control section, 10 is a display section, 11112 is a register, 13 is a ratio device.

Claims (1)

[Claims] In a display device that displays multiple sentences on a gray display surface, a priority order is determined among the sentences to be displayed, and a priority order is set for each entry in the character pana according to the priority order. When adding characters to the buffer, the priority of the entry in the character buffer is compared with the priority of the read text of the newly written character, and the priority of the newly written character is equal or higher. case,
Write to the character buffer, and if the priority is low, do not write and control to leave the original character as it is, and if the priority of the new character to be written is the lowest, the priority of the entry in the character buffer is - [Gay play control system characterized by allowing 1 inclusion regardless of the position.