JPS59204882A - Crt image display 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 The present invention relates to a CRT image display system, and more particularly to a CRT image display system that allows partial enlargement or reduction of an image on the screen.

Prior Art Among conventional display devices, CRT display devices are suitable for displaying interactive tabulations because they can display a large amount of information on one screen. An example of a table display is shown in FIG. 1 (4), in which numerical data is filled in corresponding to the row items a - t and the column items A to . Normally, the operator cannot recognize this displayed information all at once. Information of interest is recognized by sequentially reading the displayed data along a row or column. Therefore, it would be very useful to make the screen easier to see if the display information of the rows and columns that the operator is interested in could be arbitrarily exaggerated and displayed in some way.

For this purpose, color display devices have conventionally been used.

By adding a special color to the text, it is possible to emphasize important parts of the display, but the disadvantage is that it is expensive.

Alternatively, if the display is not in color, there is a method of enlarging and displaying important characters by changing the display character size. According to the conventional character size variable mechanism, the character is enlarged without destroying its original shape, so for example, if you enlarge one character twice in the row direction and at the same time twice in the column direction, the result will be The characters will be displayed 4 times larger. If such an enlarged display is performed, it will naturally affect the display positions of other characters.

Figure 1 (Gong is column D and E in the table display in Figure 1 (4))
This is a preferable example of a display in which the intersection of column F, row d, row e, and row f is particularly emphasized to the operator.

According to the prior art described above, the enlarged characters are also enlarged in the column direction.
The characters in one line of text will protrude from the table frame and will not be displayed. This loss of part of the displayed information is particularly inconvenient when displaying tables. Furthermore, according to the conventional character size variable mechanism, complicated controls such as calculation of display character start position and generation of pixel patterns according to size control are required.
If this is done by rewriting, etc., the burden on the control microprocessor will increase and the processing efficiency will decrease.

Also, if it is done with hardware, the control circuit will become more complex, larger, and
This led to higher prices.

Yet another method is to emphasize the displayed characters by bricking them; however, for example, if one line of display data is displayed in a blinking manner, it becomes even more difficult to read.

Purpose The present invention has been developed in view of the problems in the prior art described above. The aim is to propose a CRT image display method that has a simple configuration and can quickly partially enlarge or reduce the image by controlling the deflection speed of the CRT bright spot. .

Another object of the present invention is to avoid adding or deleting new exaggerated display information to the original display information.

An object of the present invention is to propose a CRT image display method that allows an operator to easily exaggerate and display a partial display area of screen information.

Another object of the present invention is to propose a CRT image display system that can particularly emphasize and display the area where rows and columns intersect in one display.

Example An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing an example of a conventional configuration for outputting an image to a CRT display section. In order to clarify the difference in configuration from an embodiment of the present invention described later, a conventional example will first be outlined.

In the figure, l is a microprocessor (hereinafter referred to as MPU) having a built-in RAM and ROM. Under the control of the MPUI, character and table unit pixel information stored in the ROM is taken out according to the display information code group edited and stored in the RAM, and sent to the 1lf1 via the common bus 11.
It is stored in the video RAM 3 for one screen. 2 is a CRT control unit which outputs a horizontal synchronizing signal 21. Vertical synchronization signal 22 and control signal 2
Outputs 3. The horizontal synchronizing signal 21 is input to the horizontal deflection circuit 4, and a sawtooth wave 2H for scanning the bright spot of the CRTS in the horizontal direction is generated. The voltage waveform of the sawtooth wave VH is the third
As shown in the figure. The period is necessarily the sum of the horizontal scanning line time TVHI and the horizontal retrace time TVH2, and the horizontal synchronizing signal 21 provides this period. For example, while the horizontal synchronizing signal 21 is true, a signal for the horizontal scanning line section is generated, and while the horizontal synchronizing signal 21 is true, a signal for the horizontal retrace section is generated. on the other hand,
The vertical synchronizing signal 22 is input to the vertical deflection circuit 5, which generates a sawtooth waveform for vertically sweeping the horizontal scanning line. The period of the illustrated sawtooth wave vV is usually determined by the number of scanning lines for each screen, and the vertical synchronization signal 22 whose period is determined based on this is the sum of the vertical sweep time TVVI and the vertical retrace time TVV2. Gives a period. The waveform of the sawtooth wave vv' when expressed by reducing the time axis is shown in FIG.

Furthermore, 6 is a brightness modulation circuit that modulates the bright spot of the CRTS with the video signal 31, and 7 is a C RT line that amplifies the brightness modulation signal 61 and the sawtooth waves vn, vv to a necessary amplitude to drive the CRTS. It is a dynamic circuit. In addition, the control signal 23
reads one scanning line of video information from the video RAM in synchronization with the horizontal synchronizing signal 21, and updates the read address of the video RAM 3 every time this video information is displayed. A command for one screen of the CRTS is obtained by a video signal 31 synchronized with a plurality of scanning lines, and each time the display for one screen is finished, a control signal 23 synchronized with the vertical synchronization 4a No. 22 is used to control the video RAM. The read address is initialized.

A normal tabulation display as shown in the first device is obtained by the configuration and control described above. However, if you want to display the information in a specific row and column with emphasis as shown in Figure 1) with the current configuration, the video RAM by MPU1
It will be necessary to update the content of this document. Moreover, in this case, the display area of one row and one column, which is displayed extremely small in order not to lose information in the table display, becomes narrower, so the video RAM is This creates an inconvenience in that a reduced character pattern must be devised to form.

FIG. 4 is a block diagram showing the structure of an embodiment of the CRT image display system according to the present invention. Here, the same numbers are given to structures equivalent to those in FIG. 2. 1 is an MPU, 2 is a CRT control unit, 3 is a video RAM, 6 is a brightness modulation circuit,
7 is the cgTm motion circuit.

Reference numeral 8 denotes a CRT"c. Here, the newly added sweep mode storage section 9 and the horizontal and vertical deflection circuits 14 and 15 controlled thereby will be explained below.

The principle operation of the embodiment is that when a video signal 31 corresponding to a dot pattern is output to the brightness modulation circuit 6 according to a clock of a constant frequency, a sawtooth wave VH and a sawtooth wave VV are output.
is modulated according to the information stored in the sweep mode storage unit 9, and as a result, in the horizontal scanning of a bright spot, there are parts where the bright spot is scanned relatively quickly and parts where it is scanned slowly. This causes the dot pattern displayed on the screen to be displayed in an expanded and contracted manner.

Similarly, in the vertical sweep of horizontal scanning lines, there are parts where the spacing between the scanning lines becomes relatively long and parts where it becomes relatively short, resulting in a state in which the display pattern is displayed isometrically expanded and contracted in the vertical direction. It is something that makes you

Of course, it is also possible to display only a partially enlarged display or only a partially reduced display.

FIG. 5 is a block diagram showing the relationship between the horizontal scanning section of the sweep mode storage section 9 and the horizontal deflection circuit 14 in more detail. Incidentally, the relationship between the part related to the vertical sweep (not shown) and the vertical deflection circuit 15 is almost the same except that the time constant of the generated sawtooth wave V2 is different.

Here, an example of the horizontal deflection circuit 4 in the prior art is as follows.
When the operational amplifier A, the resistor R1 and the capacitor C that constitute the integrating circuit, and the horizontal synchronizing signal 21 are at HI level, the contact S is opened to enable charging of the capacitor C, and the L
It consists of an analog switch ASW that closes the contact S and rapidly discharges the charge of the capacitor C when the voltage is O level. Waveforms showing the operation of the circuit having this configuration are shown by the sawtooth wave signal 1 and the horizontal synchronizing signal 21 in FIG. A horizontal scanning modulation signal 91-H was superimposed on the summation voice SP of the expanded operational amplifier A of the horizontal deflection circuit 14 having the configuration of the embodiment through a resistor R2. This modulation signal 91-
H is output from the sweep mode storage section 9. The MPUI forms data for generating modulation signals 9l-H (vertical sweep modulation signals 9l-V) when there is a request for partial enlargement/reduction of the display screen. Regarding the example of tabular table display, the parts that make up the outer frame of one table are displayed normally,
From the viewpoint of ease of viewing, it is desirable to display Rurui without any change even when it is enlarged or reduced.Therefore, modulation data for enlarging or reducing the display in the inner frame of the table display is created.

For example, if there is a tabulation display that originally requires 80 characters in one line, and there is a request to display 10 characters in double size, the remaining 70 characters will be displayed in the display area for 60 characters. A stable display of the table can be obtained by reducing the display size. The MPUI calculates and forms the modulation data according to this display ratio and information indicating a portion to be further enlarged or reduced.

Next, this data is a vertical synchronization signal 22 and a horizontal synchronization signal 2.
A control signal 23 synchronized with 1 is sent via the common bus 11 and stored in the 7 register 901. At this time, switch SW is connected to contact 903. In other cases, the shift register 901 is configured to be able to cycle through parallel modulated data consisting of several bits. The structure of the parallel data in this embodiment is such that one bit of the parallel data is signed with a sign code and the remaining bits are numerical data. According to this data structure, the D/A converter 902 outputs a positive/negative analog modulation signal 91-H. Further, in the embodiment, the capacity of the shift register 901 is made to correspond to the number of dot patterns for one scanning line. Therefore, the dot pattern signal is synchronized with the clock that is output to the brightness modulation circuit 6, and accordingly, the contents of the shift register also go through one cycle.

The waveform of the horizontal scanning modulation signal 91-H output by such a configuration is shown in FIG.

The component of the integral signal that this modulation signal 91-H causes at the output of the operational amplifier A is shown by a waveform V2. Therefore, due to the action of summing poi/)SP, operational amplifier A
The horizontal scanning signal VH finally output from is given by the sum of waveform Vl and waveform 2 shown in FIG. Here, to explain the display example shown in FIG. 1(B) in correspondence with the waveform of the modulated horizontal scanning signal VH, the entire scanning section TVH
In I, there is a normal scanning speed section a from the start of horizontal scanning to the outer frame of the table display, a slow scanning section that displays up to column C, and a faster scanning section that displays up to column F. There is a section C, a section d where the scanning speed is slow and displays up to one column, and a section e where the scanning speed is normal until the end of horizontal scanning. Further, the same can be said about the vertical sweep signal vv that vertically sweeps the scanning line. Here, the relationship between the modulated horizontal set meal signal VH and the similarly modulated vertical sweep signal v is shown in FIG.

Effects As described above, according to the present invention, C
By controlling the deflection speed of the RT bright spot, it is possible to arbitrarily emphasize and enlarge or reduce a partial display area of screen information. Furthermore, since there is no need to add any control to the pattern information in the image memory, such display control can be simplified. It is not necessary to edit any original pattern information in order to obtain enlarged or reduced display.

Furthermore, according to the present invention, it is possible not only to partially emphasize the displayed information in the first row and the first column, but also to display the part where the first row and column change with particular tone, so that it is possible to display a variety of tone display means in a simple manner. This means that you have obtained .

Also, the present invention may be used for tabular display as in the embodiment.

It is particularly effective because it allows you to easily display the tone of an interesting display part by operating the keyboard while looking at the screen.

[Brief explanation of the drawing]

The first device is an example of a tabular display, FIG. 1(B) is an example of a tabular display that is partially highlighted and enlarged/reduced, and FIG. 2 is a block diagram showing an example of a conventional CRT image display method. 3 is a timing chart showing horizontal and vertical sweep signal waveforms in the CRT image display method of FIG. 2, FIG. 4 is a block diagram showing the configuration of an embodiment of the CRT image display method according to the present invention, and FIG. 5 6 is a block diagram showing the sweep mode storage unit and the horizontal deflection circuit in more detail, FIG. 6 is a timing chart showing waveforms related to the configuration shown in FIG. 5, and FIG. 7 shows the relationship between the expanded horizontal scanning signal and the vertical sweep signal. FIG. Here, 1... microprocessor (MPU), 2...
- CRT control unit, 3... Video RAM, 4... Horizontal deflection circuit, 5... Vertical deflection circuit, 6... Brightness modulation circuit, 7... CRT drive circuit, 8... CRT , 9・
...Sweep mode storage unit, 14...Horizontal deflection circuit, 15
... Vertical deflection circuit. 7$1 Figure (A) (3) Figure 2 Figure 3- vVl No. 4rXJ

Claims (1)

[Claims] A CRT control unit, an enlargement/reduction area storage unit that stores areas to be enlarged or reduced on the CRT screen, and a CRT scanning unit that performs vertical and horizontal deflection scanning of the CRT according to signals from the control unit and the storage unit, Depending on the contents of the enlarged/reduced part storage section! A CRT image display system characterized by partially enlarging or reducing information display by fully modulating the vertical and horizontal deflection scanning voltages of the CRT.