JPH042958B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a display device that displays characters, numbers, figures, etc., and particularly relates to a display device that controls a display screen to display a line display or a graph display.

[Description of the prior art and its problems] Conventionally, when displaying lines, etc. on the display screen of a display device such as a cathode ray tube (hereinafter referred to as CRT), a method of writing an arbitrary line pattern in a refresh memory and the type of line lines have been proposed. Two types of code refresh methods are being considered, in which a code is assigned to each character and the display is performed in the same way as normal character display. Although the former method has the advantage of being able to write arbitrary lines at arbitrary positions, it has the disadvantages of increasing memory capacity and taking time to rewrite the display contents, so the latter code refresh method has been used. Ta. Even in this code refresh method, patterns such as ruled lines must be displayed between displayed characters and between lines, so patterns that should be stored as one character for every character are required. The number of dots required is larger than the number of pattern dots of the letters themselves,
The drawback was that the character generator became large.

[Means and effects for solving the problems] The present invention provides a display device that solves the drawbacks of this type of display device described above.

Another object of the present invention is to provide information on the marking line display.
By controlling a part of the pattern obtained from the character generator so as not to change, the skeleton in the direction that coincides with the scanning direction of the CRT's electron beam can be adjusted to In this case, by controlling the raster address to the character generator, it is possible to display lines, graphs, etc. on the display screen using a small-capacity character generator that only has a dot pattern for one character. The present invention provides a display device that displays

[Embodiment] FIG. 1 is a block diagram of an embodiment according to the present invention.

1 is a synchronization signal necessary for displaying information on a CRT device, an address signal for a refresh memory 2 which stores codes and display information such as characters to be displayed corresponding to the display screen, and a character string for one line. For example, Hitachi's HD46505S is a synchronizing signal generating circuit that generates an address signal for one scanning line (raster address signal), etc., and is integrated into one chip. Reference numeral 3 denotes an address multiplexer which switches between the address signal from the processing unit CPU and the display address signal output from the synchronization signal generation circuit 1 in order to rewrite the contents of the refresh memory. Reference numeral 4 denotes a character generator in which character patterns and the like are stored, and a pattern for one line can be obtained by inputting a character code and a raster address signal. Reference numeral 5 denotes a conversion circuit for parallel-to-serial conversion, which converts the pattern obtained from the character generator 4 into a serial dot signal. This conversion circuit 5 has flip-flops 5-1 to 5-5 which have a number of dots in the horizontal direction of one character (5 in this embodiment) or more.
5, the signal input in parallel by the load signal is sent to the flip-flop 5-5 → 5-4.
-> 5-3 -> 5-2 -> 5-1 using the dot clock. Flip Flop 5-
In addition to the signal from the character generator 4, a signal from the AND circuit 6 is also input to 5. The AND circuit 6 receives the output of the flip-flop 5-5 and the output of a circuit for detecting the display of a contour line from the display information output from the refresh memory. 7 is a marker line detection circuit which outputs a signal of 0 when a normal character is displayed, and outputs a signal of 1 when a marker line is displayed. 8 is the synchronization signal generation circuit 1
This circuit detects the line spacing from the raster address output from the . 9 is a raster address change circuit;
The raster address, which is counted up each time the CRT's electron beam scans in the horizontal direction, is changed to a specific raster address when the line spacing detection circuit 8 detects that there is a spacing between lines and displays the line spacing. . For example, if the raster addresses of the synchronization signal generation circuit are 7, 8, and 9, and the output is changed to 6, the pattern obtained from the character generator 4 will be the bottom pattern of the one-character dot pattern. Become. This raster address changing circuit 9, for example, outputs raster addresses 1, 2, 3, 3, 3, 3, 3, 4, 5, 6, 7, 8, 9 corresponding to input raster addresses 1, 2, 3, 4, 5, 6, 7, 8, 9, respectively.
4, 5, 6, 6, 6, and 6 can be configured by a memory storing each of them. 10 is an inverter, 11 is a NAND circuit, and 12 is an AND circuit. 13 is a display device, for example a CRT.

The operation of the embodiment having the above configuration will be explained.

Since the output of the marker line detection circuit 7 is "0" in normal character display, the flip-flop 5-5
The output from the flip-flop 5-1 will be "0" after 5 dot clocks, and the output will be "0" between the characters as in "A5" in the display example in Figure 1. nothing is displayed. When displaying a horizontal line, the output of the detection circuit 7 becomes "1", and when the output of the flip-flop 5-5 is "1", "1" is input to the flip-flop 5-5, and the five dot clocks are After that, "1" is output from the converter 5, and a horizontal line is displayed between the characters. At this time flip-flop 5-5
If the output is "0", nothing will be displayed, and the space between the characters in the horizontal direction will be displayed as shown in Figure 1.

On the other hand, in the case of normal character display, the output of the NAND circuit 11 is "0", so the AND circuit 12
is "0" and in the case of a vertical line display in which nothing is displayed, the output of the NAND circuit 11 becomes "1", the output of the conversion circuit 5 is sent as is to the display 13, and vertical lines are displayed between the lines.

In this embodiment, the output of the contour line detection circuit is input to the raster address changing circuit, but the display as shown in FIG. 1 can be obtained even without inputting the output.

Further, in this embodiment, an example of display of a contour line has been described, but a simple display such as a bar graph can also be displayed using a small capacity character generator according to the present invention.

[Effects of the present invention] As explained above, in the display device of the present invention, when displaying lines or the like, it is not necessary to have a pattern including character spacing and line spacing in the character generator. Since it is only necessary to have a pattern for 100 minutes, the capacity of the character generator can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram explaining its operation. 5-1 to 5-5... flip-flop, 6...
AND circuit.

Claims (1)

[Scope of Claims] 1. A display device that displays a ruled line pattern along a display arrangement of character patterns, comprising: code information storage means for storing character code information and ruled line code information to be displayed; and said code information storage means. pattern storage means for storing character patterns and ruled line patterns corresponding to the stored character code information and ruled line code information; line spacing detection means for detecting the line spacing of the ruled line pattern when displaying the ruled line pattern in the column direction; When displaying a ruled line pattern, a column-interval detection means for detecting the distance between the columns of the ruled-line pattern, and when the line-spacing detection means detects the row-spacing of the ruled-line pattern, a column direction that is displayed adjacent to the line-interval is provided. A part of the ruled line pattern is read from the pattern storage means and interpolated and displayed as a ruled line pattern, and when an interval between columns of the ruled line pattern is detected by the inter-column detection means, the ruled line pattern is displayed adjacently between the columns. A display device comprising: pattern interpolation display means for reading a part of the ruled line pattern in the row direction from the pattern storage means and interpolating and displaying it as a ruled line pattern.