JPS5831587B2 - Character display device for CRT - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a CRT (Cathode®) using a scanning line method.
This invention relates to a character display device for ayTube.

This type of CRT character display device is known from, for example, Japanese Patent Laid-Open No. 50-99438.
In order to display symbols, etc., the screen was divided into grid patterns as shown in Figure 1, and one character, number, or symbol was displayed to fit within one frame. For example, as shown by the circle in the same figure, it is not possible to display characters, etc. at any arbitrary position that spans the base, in other words, it is not possible to display characters, etc. only in extremely necessary block units. It is not possible to specify the display position of the image, which is very inconvenient when displaying graphics, for example.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to precisely control the display position of characters, etc. so that characters, etc. can be displayed at any desired position on a CRT screen. It is an object of the present invention to provide a CRI character display device that is new and has high utility value and can be specified.

In order to achieve the above object, the present invention [i-
As shown in the figure, the character display start position a on the X axis and the character display start position a on the Y axis are given, and the intersection of the two is given.

This allows you to start drawing characters (for example, ttTtru characters).

The Y-axis character display start position is determined by one of the scanning lines RK (Ro≦RK≦RN) scanned at each dot interval as schematically shown in FIG. On the other hand, the X small character display start position a is given by the time t obtained by dividing the time it takes for the scanning lines R8-RN to scan from the left edge of the screen so as to correspond to the dot spacing. .

-tN, one time tK (to≦tKstN
) is given by specifying

Of course, it is also possible to reverse the relationship between the X-axis and the Y-axis.

Therefore, according to the present invention, instead of specifying the display position of characters, etc. in units of extremely one-figure or one-kana blocks as in the past, the display position of characters, etc. is specified with extremely precise resolution, that is, it can be said that it is close to an analog feeling. This made it possible to easily specify the display position in as much detail as possible, making it extremely convenient especially when displaying graphics or adjusting the number of lines or character spacing.

Hereinafter, one embodiment of the present invention will be described in more detail based on FIGS. 4 to 11.

FIG. 4 [i-1] is a Y-axis start signal generator that generates a signal indicating the display start position of characters, etc., drawn in the Y-axis direction (scanning line direction) of the CRT screen; The configuration shown in the figure is adopted.

In Fig. 5, 11 is a scanning line counter which takes the horizontal synchronizing signal for the CRT as a counting input and is reset each time by the vertical synchronizing signal, and its output is a signal indicating whether or not the current scanning line is being scanned. the law of nature.

-Emit LN. 12 is a Y-axis display start position memory counter, and switch SW1 serves as a manual operation means for the Y-axis.
If you put it into the UP side, it will count up, and if you put it into the DOWN side, it will count down.

Further, 13 is a comparator, and the scanning counter 11
output signal.

-LN and the output signal YM of the Y-axis display position memory counter 12
O-YMN is compared, and when both match, match signal Y
emits.

In FIG. 4, reference numeral 2 denotes an X-axis start signal generator that generates a signal indicating the display start position of characters etc. that fade in the X-axis direction of the CRT screen, and for example, the configuration shown in FIG. 6 is adopted.

FIG. 6 [i-21 is an X-axis counter which takes the dot interval division signal as a counting input and is reset each time by a horizontal synchronizing signal, and its output is connected to the scanning line RK (Ro
A signal t indicating the time required for the RKsRN) to scan from the left edge of the screen.

-tN is emitted. 22 is an X-axis display start position counter, and switch SW2 as a manual operation means for the X-axis circumference is
If you put it on the P side, it will count up, and if you put it on the DOWN side, it will count down.

Further, 23 is a comparator, and the X-axis counter 21
The output signal t.

-tN and the output signal XM of the X-axis display start position counter 22
o-XMN, and when the two match, a match signal X is generated.

As shown in FIG. 7, the dot interval division signal is a clock pulse synchronized with the horizontal synchronization signal (actually, the dot interval division signal is frequency-divided to obtain the horizontal synchronization signal.

), which sets the dot spacing along the Y-axis direction as explained in FIG. 3 above.

In FIG. 4, 3 receives the Y-axis start signal of the Y-axis start signal generator 1, that is, the coincidence signal Y, and CR converts characters etc.
A Y-axis lighting controller that generates a Y-axis lighting control signal necessary for displaying in T, for example, a control signal that lights up the number of scanning lines corresponding to 7 dots if the character is 5 × 7 dots, For example, the configuration shown in FIG. 8 is adopted.

In FIG. 8, ANDI is an AND circuit, 31 is a hexadecimal counter that counts the horizontal synchronizing signal applied through the AND circuit ANDI, and issues a carry-out when the count reaches 11799 IC, and F/Fl is set by the coincidence signal Y. It is a flip-flop that is reset by carry-out.

When the coincidence signal Y is applied to F/F 11/7 to this configuration, the YDISP signal is generated from the Q terminal.

At the same time, the AND gate is opened by this signal, and the horizontal synchronization signal is input to the heptadary counter 3U, and the counter 31 starts counting.

When the count number of the counter 31 reaches tt7pp, a carry-out is generated from the output, the F/Fl is reset, and the MDISP signal is stopped.

This operation is shown in the time chart of FIG.

Here, the MDISP signal is a Y-axis lighting control signal,
It is added to the next-described X-axis lighting controller 4 and the next-stage character generator 5.

4 is an X-axis lighting control signal necessary for displaying characters, etc., in response to the X-axis start signal of the X-axis start signal generator 2, that is, the coincidence signal X; for example, a control signal for lighting for a scanning time of 5 dots This is an X-axis lighting controller that generates an X-axis lighting controller, and for example, the configuration shown in FIG. 10 is adopted.

In FIG. 10, AND2 is an AND circuit, 41 is a quinary counter, and F/F'1lri is a flip-flop that is reset by the match signal X and reset by the carryout generated from the quinary counter 41.

In this configuration, when the coincidence signal X is applied to F/F2, the XDISP signal is generated from the Q terminal and this signal is added to AND2.

At this time, if the MDISP signal is being applied at the same time, the AND gate is opened and the dot interval division signal is applied to the counter 41 via AND2, and the counter 41 starts counting.

Then, when the count reaches it5#, a carry-out is issued, F/F2 is reset, and the MDISP signal is stopped.

This operation is shown in the time chart of FIG.

The XDISP signal obtained by this operation is the X-axis lighting control signal, and is applied to the character generator 5 at the next stage.

Reference numeral 6 denotes a character storage device consisting of a RAM, a flip-flop, a shift register, etc., which stores characters to be displayed on a CRT, and the storage signal from this device is converted into a dot format by a character generator 5. converted.

On the other hand, the character generator 5 inputs the signal converted into the dot format into the XDISP signal and YDI.
The transmission is controlled depending on the presence or absence of the SP signal and input to the CRT.

Thus, the CRT screen displays the XDISP signal and the YDI
Characters etc. stored in the storage device 6 are displayed as dots at the position specified by the SP signal.

By the way, when I press the button on the CRT character display device with this configuration,
Y-axis and X-axis circumferential manual operation means SW1. When SW2 is manually operated and turned on to the UP side or DOWN side, the count numbers of the Y-axis and X-axis start position counters 12 and 22 change, and the timing at which the Y-axis and X-axis start signals Y and X are issued accordingly. is controlled.

These start signals Y and X are used by the Y-axis and X-axis lighting controller 3.
, 4. As a result of being sent to the CRT via the character generator 5, the display start position on the CRT screen is moved in accordance with the start signals Y and X.

In addition, in this case, the movement of the display start position is for the Y-axis and for the X-axis.
Shaft circumference manual operation means SW1. Although it can be controlled arbitrarily by manual operation of SW2, it is possible to move at the minimum dot interval.

In other words, according to this configuration, characters etc. can be displayed at a desired position on the CRT screen.

In the above configuration, if the character storage device 6 is configured to be controlled by the Y-axis and X-axis start signal generators 1 and 2, two or more characters, numbers, symbols, etc. can be moved to a desired position. In addition, graphs can be moved and displayed along with these characters, etc.

As described above, according to the present invention, it is possible to display characters, etc. at a desired position on a CRT screen, eliminating the inconvenience caused by conventional means, and it is expected that it will be widely used in various fields. be.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional method of displaying characters, etc., FIG. 2 is a diagram showing a display example according to the present invention, FIG. 3 is a diagram showing a CRT screen, and FIG. 4 is a diagram showing a CRT screen according to the present invention. FIGS. 5 to 11 are block diagrams showing one embodiment of the character display device, and are waveform diagrams illustrating specific examples of each block shown in FIG. 4 and the operations of those blocks. DESCRIPTION OF SYMBOLS 1... Y-axis start signal generator, 2... X-axis start signal generator, 3... Y-axis lighting controller, 4... X-axis lighting controller, 5... Character generator, 6 ...Character storage device, SWl, SW2...Manual operation means.

Claims (1)

[Claims] I An X-axis start signal generator that generates a signal indicating the display start position of characters, numbers, symbols, etc. in the X-axis direction on the CRT screen, and an X-axis start signal generator that generates a signal indicating the display start position of characters, etc. in the Y-axis direction on the CRT screen. a Y-axis start signal generator that generates a signal indicating the display; and a manual operation means that manually controls the X-axis and Y-axis start signals to set a display start position at a desired position on the X-axis and Y-axis. An X-axis lighting controller that receives the X-axis start signal and generates an X-axis lighting time signal necessary to display characters, etc.; and an X-axis lighting controller that receives the Y-axis start signal and generates the A Y-axis lighting controller that generates an axis lighting time signal, a character storage device that stores characters to be displayed, and a character generator that converts the signal from the storage device into a dot format. A character display device for a CRT, characterized in that the display of characters, etc. is started from the intersection of the display start position of characters, etc. that fades in the direction of the Y-axis and the display start position of characters, etc. that fades in the Y-axis direction.