JPH0569236B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a data display device for a data processing device such as a computer, and in particular, to sequentially display data that cannot be displayed on one screen of the display device on the screen. The present invention relates to a data display device that displays all or a desired portion of data.

[Background of the invention]

Data processing devices such as computers
For example, the computer has a display device that displays these data on a screen for editing source programs, etc., or visually inspecting them. A cathode ray tube (hereinafter referred to as CRT) display device is generally used for this purpose. The screen of this type of display device is limited, and there is a limit to the amount of data that can be displayed on the screen at one time. Therefore, conventional methods such as scrolling have been used to visually inspect the screen of the display device for a large amount of data that cannot be displayed on the screen at once. This is a method of displaying data on the screen of a display device; if the data up to the last line on the screen is displayed and a new display line is required,
The first line on the screen is erased, each line is moved up the screen one line at a time, and a new display line is reserved as the last line on the screen. By repeatedly and continuously performing this, data that cannot be displayed on one screen is displayed one after another on the screen, thereby allowing a large amount of data to be visually inspected. For this reason, this scrolling is also called rack-up or wind-up display.

As described above, conventional scrolling is effective in that a large amount of data can be visually inspected on a limited screen. However, when looking at a screen where data is displayed continuously, each displayed line always moves from the bottom line to the top line, so when the user reads the displayed data, the faster the display speed becomes, the faster the display speed becomes. A problem arises in that it becomes difficult to read.

The actual usage of this scrolling is to constantly monitor the continuously displayed display data, and when the desired data is displayed, the display is temporarily interrupted by an external key input, etc., and the data is displayed in this state. I am taking a method of checking. However, as the display speed becomes faster, in addition to the problem of not being able to properly monitor the display data mentioned above, the timing of temporarily interrupting the display due to external key inputs etc. cannot be done correctly, for example, the timing of key inputs may be delayed. When the display screen stops,
A problem arises in that the desired data has already disappeared due to scrolling.

If the scrolling speed is improved, the efficiency of tasks such as data monitoring will be improved, so there is a strong demand for this speed improvement. However, simply increasing this speed will cause the above-mentioned problems.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to enable the user to easily monitor displayed data even if the scrolling speed is improved. The object of the present invention is to provide a data display device that can reduce fatigue.

[Summary of the invention]

The difficulty in reading data displayed on a screen is that due to scrolling, each line of displayed data on the screen is constantly moving from the bottom line to the top line. Therefore, the present invention transfers the multiple lines of data displayed in the lower area of the screen, character by character, to the upper area consisting of multiple lines immediately before the data, after the data has been displayed on the entire screen, and transfers the data one character at a time. At each time, the character data displayed in the lower area where the transfer has been completed is erased, all the displayed character data in this lower area is moved to the upper area, and all the displayed character data in this lower area is also erased.

Then, additional data is displayed one character at a time in the erased lower area. Then, by displaying the data over the entire screen again, the above process is repeated and the data is continuously displayed.

In other words, the present invention is characterized by: a display means comprising a display data storage section corresponding to a display screen, displaying display character data written in the display data storage section on the display screen; a writing means for sequentially writing the display character data into a storage section; writing by the writing means;
detection means for detecting that the position of the display data storage unit corresponds to a predetermined final display position on the display screen, and a display consisting of a plurality of lines at a predetermined lower part of the display screen in response to the detection; The display character data in the display data storage unit displayed in the display area is transferred character by character to the area of the display data storage unit corresponding to the display area consisting of multiple lines above the display area located immediately before the display area, and , by erasing the display character data in the display data storage unit displayed in the lower display area consisting of multiple lines each time the one character is transferred, the display area corresponding to the lower display area consisting of multiple lines is deleted. a transfer means for erasing display character data in a display data storage unit;
writing position changing means for setting a writing position in the display data storage section by the writing means to a position corresponding to the next position in the upper display area consisting of a plurality of lines in response to the completion of processing by the transfer means; The reason is that it is equipped with the following.

In this way, when viewed as a whole, the display screen always remains stationary on the screen except when the displayed character data in the lower area moves to the upper area.
It becomes easier to read character data displayed on the screen.
In addition, since the displayed character data in the lower area is erased each time it is transferred upward one character at a time, it can be visually observed as if the characters are moving, and unnecessary displayed character data is removed from the screen. This reduces fatigue during monitoring.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is a block diagram showing the overall configuration. In this figure, 1 is a cathode ray tube display device (hereinafter simply referred to as CRT), 2 is a random access storage device (hereinafter referred to as RAM), 3 is a microprocessor which is an arithmetic processing unit, and 4 is an input unit. 5 is a read-only storage device (hereinafter abbreviated as ROM). 6 is a clock oscillation circuit that generates a clock signal serving as a reference for operation, 7 is a timing control circuit, 8 is a ROM for character font, 9 is a CRT control circuit, 1
0 is a refresh memory, and 11 is a parallel/serial conversion circuit.

These operations are as follows. In other words, when inputting data from keyboard 4,
The program stored in the ROM 5 causes the microprocessor 3 to operate based on the instructions of the program.
The character font corresponding to the character data inputted from the character font ROM 8 is transferred to the refresh memory 10.

Next, when another key is input from the keyboard 4 again, the character font corresponding to this input data is similarly transferred to the next location in the refresh memory 10. In this manner, microprocessor 3 transfers character fonts to refresh memory 10 for storage in response to input. The above is
The microprocessor 3 operates and executes the program stored in the ROM 5. At this time, the clock oscillation circuit 6 is connected to the microprocessor 3.
Input the basic pulse so that it operates regularly.

On the other hand, the basic clock pulse from the clock generating circuit 6 is also input to the CRT control circuit 9. CRT
In response to this basic pulse, the control circuit 9 reads data from the refresh memory 10 using the time period when the microprocessor 3 is not accessing the refresh memory 10. This read data is converted into a rectangular pulse train through the parallel/serial conversion circuit 11. This pulse train is input to the CRT 1 as a video signal v. In addition, for CRT1, CRT control circuit 9
The synchronizing signal s output from the synchronous signal s is also inputted together with this. CRT1 These signals cause the dot at the corresponding position on CRT1 to light up brightly when the video signal v is at a high level voltage. This is based on the synchronization signal s from the top left of the CRT1 screen to the right, and then from the left to the right for the row below.
It scans and displays all dots on the CRT 1 screen. Therefore, the CRT control circuit 9 sequentially takes out the data in the refresh memory 10 from the upper left of the screen of the CRT 1 to the right, and then the data in the next stage, and outputs the data to the parallel-to-serial converter circuit 1.
1. Therefore, the CRT control circuit 9 generates a memory address for the refresh memory 11 so that the data can be retrieved in the above order.

CLRG is a cursor position storage unit provided in the CRT control circuit 9, and stores the coordinate position of the cursor on the display screen indicating which position on the screen of the display device 1 is the processing target. This cursor position memory
By storing desired coordinate data in CLRG, the CRT control circuit 9 specifies a cursor at a desired position on the screen of the display device 1. In other words, updating the cursor display position means updating the cursor position memory.
This is accomplished by writing the desired coordinate data into CLRG.

Figure 2 shows the relationship between the display screen SC of the display device CRT and the storage section, and the display data displayed on the display screen SC is generally stored in the display data storage section VRAM called text buffer memory. written. This is logically set, for example, on the RAM 2, and is set in correspondence with the display screen SC. For example, if the display screen SC has 80 characters per line and can display 24 lines, the display data storage
VRAM is set as a contiguous memory space of 80 x 24 = 1920 [bytes]. And display screen SC
In correspondence with this, the display data storage unit VRM stores the first digit of the first line, the second digit of the first line,..., the first digit of the second line, the second digit of the second line,... Display data, such as character codes, are sequentially stored in correspondence. Since the display screen SC and the display data storage unit VRAM have such a relationship, generally the display data storage unit for row j and column k on the display screen SC
The relative address i from the beginning of VRAM is i=(j−
1) It can be calculated as x80+(k-1). When the display data to be displayed is stored in the display data storage unit VRAM by the processing operations of the microprocessor 3, the stored contents are sequentially read out by the function of the CRT control circuit 9 as described above. This is converted into font data by the ROM 8 and input to the refresh memory 10.
Display screen SC by CRT1 as shown in Figure 2
displayed above.

FIG. 3 shows the main parts for realizing the present invention, which are stored in the RAM 2 or ROM 5 in the form of a program.
The processing is executed by the microprocessor 3. In this example, one line is used as the CRT.
It is assumed that the display area is 80 digits and 24 lines, and when all lines of the display screen SC are displayed,
A case will be described in which the lower half of the screen is transferred to the upper half for display, the display in the lower half is erased, and the subsequent display data is subsequently displayed in the lower half display area. This is illustrated in FIG. 4. That is, data is displayed sequentially on the display screen as shown in Figure 4a, and when the data is displayed up to the final position on the screen SC, the data from the 13th line to the final 24th line on the screen SC is displayed. is transferred and displayed from the 1st line to the 12th line as shown in FIG. 14b. Then, the cursor CL points to the first column of the next 13th line,
The next input display data is sequentially displayed from this position. After that, the steps in FIG. 4a and FIG. 4b are repeated. Furthermore, the data to be displayed is data generated to be displayed on the CRT 1 by executing an application program or the like stored in the RAM 2 or the like.

Below, FIG. 3 will be explained. CRWR is a writing means and has a character display means DESP and a cursor position update means CPUD. Character display means
As will be explained in detail later, DESP stores the data sequentially generated by the execution of the application program at a predetermined location in the display data storage unit VRAM, that is, at this point, at the cursor CL.
Display data storage corresponding to the position where is located
The data is sequentially written starting from the VRAM address and displayed on the screen SC of the CRT1. The cursor position update means CPUD is controlled by the character display means DESP.
When the display data writing and display operations are completed, the position of the cursor CL on the screen SC is updated to the next data display position. DTCT is a detection means, and writing by writing means CRWR is
It is detected whether the position of the display data storage unit VRAM corresponds to a predetermined final display position of the display screen SC. This predetermined final position may be the 80th column of the 24th line of the display screen SC, or if the number of data displayed on the line is less than 80, it may be a line feed code, etc. in the middle. In some cases. In short, this means directly or indirectly detecting the end of the display operation on the last line of the screen SC. TRAN is a transfer means, and PCVT is a write position change means, the details of which will be described later. Transfer means
TRAN detects that the final display position is detected by the detection means DTCT, so the display screen SC
The data stored in the storage area of the display data storage unit VRAM corresponding to the display area from the 13th line to the 24th line is transferred to the display area from the 1st line to the 12th line of the display screen SC. Corresponding display data storage section
Transfer to VRAM storage. Furthermore, the storage contents of the display data storage section VRAM corresponding to the display area from the 13th line to the 24th line are erased. The writing position changing means PCVT changes the display data storage section by the writing means CRWR upon completion of the processing of the transfer means TRAN.
Change the VRAM write position to the 1st digit of the 13th line of the display screen SC.

FIG. 5 is a flowchart showing the character display means DESP in detail, and this diagram will be explained below. By starting this character display means DESP,
First, in step 5a, the character code of display data generated by execution of the application program is fetched. Then, in step 5b, the address of the display data storage unit VRAM corresponding to the position where the cursor CL is currently located is calculated. This can be calculated based on the above-mentioned calculation formula by taking in the contents stored in the cursor position storage unit CLRG and using this contents. Then, in the following step 5c, the address of the display data storage unit VRAM calculated in step 5b is entered.
5a and stores the character code.
Thereafter, processing is transferred to the font transfer means CFMV for one character. The one-character font transfer means CFMV is for transferring a character font corresponding to a character code to a position in the refresh memory 10 corresponding to the display position of the cursor CL, as will be described in detail later.

With this configuration, the character code of the generated display data is written in the display data storage unit VRAM at a position corresponding to the cursor CL on the display screen SC, and the corresponding position on the display screen SC corresponds to the character code. The characters will be displayed.

FIG. 6 is a flowchart showing details of the one-character font transfer means CFMV, and this diagram will be explained below. Upon activation, the means CFMV calculates the address of the display data storage unit VRAM corresponding to the position of the cursor CL currently located on the display screen SC in step 6a. Then, in the following step 6b, step 6a
Based on the calculation results, display data storage unit VRAM
Read the data stored at the address calculated. In step 6c, the read data, that is, the character font corresponding to the character code, is read from the character font ROM 8. In step 6d, the address of the refresh memory 10 corresponding to the address of the display data storage unit VRAM is calculated, and in step 6e, the font data read out in step 6c is used as the address of the refresh memory 10 calculated in step 6d. Transfer to. As a result, the character code stored at a certain address in the display data storage unit VRAM is displayed as a character at a corresponding predetermined position on the display screen SC.

Figure 7 shows the transfer means TRAN and the writing position changing means.
This is a flowchart showing details of PCVT, and this diagram will be explained below. As is clear from FIG. 3, in this means, the detection means DTCV detects that the writing by the writing means CRWR is at a position in the display data storage unit VRAM corresponding to a predetermined final display position on the display screen SC. It is activated depending on what you did. First, in step 7a,
Set the cursor CL to the middle position of the display screen SC. Specifically, the first line of the 13th line of the display screen SC
It is the digit. Then, process one character transfer means
Move to CRMV. This means CRMV, which will be described in detail later, moves the character at the position of the cursor CL upward by half a screen, and replaces the character at the position of the cursor CL with a space. Specifically, the character in the 1st column of the 13th line of the display screen SC is placed in the 1st column of the 1st line, and the character in the 2nd column of the 13th line is placed in the 1st line. The data is transferred sequentially to the second column, and so on, and the first column, second column, etc. of the 13th line are replaced with spaces in sequence. Then, in step 7b, it is determined whether the position of the cursor CL is at a predetermined final position on the display screen SC. This is similar to the detection means DTCT in FIG. If it is determined in step 7b that the position is not the final position, the position of the cursor CL is updated in the following step 7c. Specifically, this means moving the cursor CL to the next character display position, changing what was in the 1st column of the 13th line of the display screen SC to the 2nd column of the 13th line. It is to move to. Thereafter, by repeating steps 7b and 7c of the single character transfer means CRMV, each of the characters displayed on the lower half screen of the display screen SC will be sequentially transferred and displayed on the upper half screen, and the lower half screen will be It will be deleted because it will be replaced with a space. When it is detected in step 7b that the predetermined final screen position, that is, the lower half screen of the display screen SC has been completely transferred to the upper half screen,
Processing is transferred to the position changing means PCVT. Here, the display position of the cursor CL is set to the middle position of the display screen, specifically, to the first digit of the 13th line. As a result, the processing by the transfer means TRAN and the write position change means PCVT is completed. The state of the display screen SC at this time is, for example, as shown in FIG. 4b.

Figure 8 shows the single character transfer method used in Figure 7.
This is a flowchart showing the details of CRMV, and this diagram will be explained below. This means that when CRMV is started, step 8a will change the current cursor
Display data storage section corresponding to the position where CL is located
Calculate the VRAM address. This is similar to step 5b in FIG. And step 8b
Now, the contents of the display data storage unit VRAM address calculated in step 8a, that is, the character code is read out. In the following step 8c,
In step 8b, the destination address of the read character code is calculated. In other words, this address is the display data storage unit corresponding to the half-plane ahead position.
This is the VRAM address. More specifically, the transfer destination of the first digit of the 13th line of the screen SC is the first digit of the first line, and is the corresponding address of the display data storage unit VRAM. next step
At step 8d, the character code read at step 8b is set to the address calculated at step 8c. Furthermore, a space code is set at the transfer destination, that is, the address of the display data storage unit VRAM calculated in step 8a. In the following step 8f, the character display means DESP shown in FIG. 5 is displayed for the transfer source address calculated in step 8a.
In step 8g, the character display means DESP shown in FIG. 5 is executed for the transfer destination address calculated in step 8c, and the processing of the single character transfer means CRMV is completed. In other words, specifically, the character displayed in the 1st column of the 13th line of the display screen SC is moved to the 1st column of the 1st line, and the character displayed in the 13th line The first digit will be deleted. Similar processing is performed for other columns and other columns in other rows.

By doing the above, the data will be displayed up to the last line of the display screen SC, and if a new display line is required, the display of the lower half of the display screen SC will move to the upper half, and the lower half will be moved to the upper half. The data will be erased, and new display lines will be displayed sequentially from the beginning of the lower half screen. Therefore, each line of the display screen remains stationary while the lower half of the screen is displayed, making it extremely easy to read the display data on the display screen.
This means that if the readability of the display is maintained at the conventional level, the display speed can be significantly improved. In addition, the display character data for the lower half of the screen is transferred to the lower half of the screen one character at a time, and is erased each time, so it can be visually observed as if the characters are moving, and unnecessary Display character data is not displayed on the screen, reducing fatigue during monitoring.

Also, when comparing the overall display speed with the conventional one, the time required to display characters on the CRT remains the same, but the number of times the displayed characters are transferred to the display area is greatly reduced, so the display time is shortened. It has the effect of

In the above embodiments, the case where a half screen of the display screen SC is transferred as one unit has been explained as an example, but the unit may be multiple lines, and there is no particular limitation on the number of lines. do not have. For example, if two lines are considered as one unit and the maximum number of lines displayed on the display screen is 24, each line is moved to the line two lines above. For example, change the third line to the first line,
It is sequentially transferred to the second line of the fourth line, and so on. As a result, line 23 becomes line 21, and line 24
is transferred to line 22, where it is transferred to line 23, line 22.
Delete line 24 and display a new line here. In this case as well, the screen will remain stationary while displaying the new two lines.

In addition, in the embodiment, as a display device
Although the description has been given by taking a CRT display device as an example, this may be a liquid crystal display device, for example, and is not particularly limited to this type of device. Furthermore, the display data storage unit is not limited to the one in the embodiment, but may be one that can store display contents directly or indirectly as in the embodiment, as long as it corresponds to the display screen. Bye. Furthermore, the processing means described in the embodiments are merely examples, and other processing means may be used as long as they achieve the same function.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to obtain a data display device that allows a user to easily monitor displayed data even when the scrolling speed is improved, and also to provide a data display device that allows a user to easily monitor display data in a lower area. is erased each time it is transferred upwards in units of characters, so it can be visually observed as if the characters are moving, and unnecessary display character data is not displayed on the screen, making it easier to monitor. It is possible to obtain a data processing device that can reduce fatigue.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a computer device using the present invention, FIG. 2 is an explanatory diagram showing the relationship between the display screen and the display data storage section, and FIG. 3 is a flowchart showing the main parts of the present invention. Figure 4 is a diagram showing the changing state of the display screen, Figure 5 is a flowchart showing details of the character display means in Figure 3, and Figure 6 is a detailed diagram of the font transfer means for one character in Figure 5. 7 is a flowchart showing in detail the transfer means and writing position changing means in FIG. 3, and FIG. 8 is a flowchart showing in detail the single character transfer means in FIG. be. VRAM: display data storage unit, 1: display means,
CRWR: writing means, DTCT: detection means,
TRAN: Transfer means, PCVT: Writing position change means.

Claims (1)

[Scope of Claims] 1. Display means comprising a display data storage section corresponding to a display screen, and displaying display character data written in the display data storage section on the display screen; a writing means for sequentially writing display character data; a detecting means for detecting that writing by the writing means is at a position in the display data storage section corresponding to a predetermined final display position on the display screen; In response to the detection, display character data of the display data storage section displayed in a predetermined lower display area of the display screen consisting of a plurality of lines is displayed in an upper plurality of lines located immediately before the display area. The display character data of the display data storage section displayed in the lower display area consisting of multiple lines is transferred character by character to the area of the display data storage section corresponding to the area. a transfer means for erasing display character data in the display data storage section corresponding to the display area consisting of a plurality of lines at the bottom; A data display device comprising: writing position changing means for setting the writing position of the display data storage section to a position corresponding to the next position in the display area consisting of the plurality of upper rows.