JPS5958470A - 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 relates to a display control method for a display device, in which a display control circuit performs raster control, accesses a character generator, and displays its output on a display screen. In this case, the present invention relates to a display control method that enables two types of display with one device, by switching the display area of one character between displaying characters such as kanji and graphics.

(b) Prior art and problems Conventionally, as a display control method when displaying a character, figure, etc. on a display screen such as a cathode ray tube, as shown in FIG. The character generator 4 outputs a pit pattern based on the output of the line buffer 3 containing the output of the code buffer and the line buffer 3 containing one line of code data, and the output is converted into a serial-to-serial format by the parallel-to-serial conversion circuit 5 to form a dot pattern. outputs the video signal and displays the screen.

In the screen display, when the display area for displaying two characters is 16 dots x 16 rasters as shown in Figure 2 (a), if the kanji is displayed in a 16 x 16 dot pattern, it will be as shown in Figure 3 (a) K. In many cases, the entire display surface is clogged, making it difficult to see what is displayed on the screen. Therefore, for example, as shown in Figure 2 (1J), 18 dots
It is necessary to display the text in a display area of 20 rasks with α and β spaces between characters and lines as shown in FIG. 3 (b). However, when displaying a figure 2, for example, an itagraph, in this large display area of 18 dos) x 20 rasters, it cannot be displayed continuously because the dot memory 5α of the memory is 16 x 16, and as shown in Figure 3 (b). The inconvenience is that the image is cut off, and in that case, a display area of 16 dots x 16 rasters is required.

Therefore, it is necessary to use separate devices for displaying kanji characters and the like, and for displaying figures and the like, which is inconvenient.

(C) 13I] Purpose of the present invention The purpose of the present invention is to create two types of display screens, one for displaying kanji, etc. and the other for displaying figures, etc., in one device, and to switch and control the display screens to display each display screen. The object of the present invention is to provide a display control method that enables display.

(d) According to the present invention, the character generator outputs a bit pattern according to the rask signal output from the display control circuit and the code data from the code buffer;
In the display control method in which the video signal of Shidot Bakun is outputted and displayed through a parasitic change circuit, the display control circuit is provided with raster control in which the number of rasters in one line of characters is controlled to change the line spacing. A dot control circuit is added to change the character spacing by switching the dot pattern output of the parallel-to-serial conversion, and 92 types of display screens are created by switching and controlling the raster control circuit and the dot control circuit. This is achieved by providing a display control method characterized by displaying images.

(e) Examples of the invention DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 4 is a control circuit block diagram showing one embodiment of the display control method of the present invention.

In the figure, in the present invention, a raster control circuit (register) 6 is added to the display control circuit 1 of the conventional display control method shown in FIG. Furthermore, a dot control circuit 7 is provided which changes the number of dots output from the conventional parallel-to-serial conversion circuit 50 by using a program or the like to control the character dot l. Others are the same as before.

By changing the contents of a raster control circuit (register) 6 added to the display control circuit by a program or the like, the number of rasters in one line of characters is changed. For example, by setting the number of raster lines in one line of characters to 16 in the register, the display raster in the display area as shown in Figure 2 (()) can be displayed with continuous line spacing as shown in Figure 3 (A). 2
By changing the number of raster lines and setting it to 20, it is possible to perform a display as shown in FIG. 2 (b) with a space of four raster lines between lines.

The configuration of the dot control circuit 7 is such that the dot switching signal is ANDed with the dot output of the parallel-to-serial conversion circuit 5 by an AND circuit 8, and the dot switching signal via the inverter circuit 9 is ANDed by the dot output of the parallel-to-serial conversion circuit 5. There are two outputs: a dot output and an AND circuit 1o, and their outputs are output via an OR circuit 11 as a video signal vDo.

For example, if the dot switching signal-bow has 16 dots, the second
The display dots as shown in Figure (A) can be used to continuously display figures as shown in Figure 3 (A), and if the number of dots is changed to 18, the display dots as shown in Figure 2 (B) can be displayed continuously. As shown in Figure 3 (b), characters such as kanji characters can be displayed with two dots spaced apart (α).

As mentioned above, the number of rasters, for example 16 or 20, is stored in the raster control circuit (register) 6, and the switching signal of the program or the like is used to control the switching of 16 or 20 rasters +1.
For example, after the 17th raster, blanking is performed), and two types of display screens are created by switching the output of 55 to the random conversion port between 16, tri, and 18 dots using a switching signal from a program or the like. If you display characters such as kanji when using an 18x20 display area, you can create a space between characters, and if you display a figure or the like when using a 16x1 (3) display area, continuous display is possible.

By switching between these two types of display screens, two types of display can be performed in 42 digits of 1 hour, and there is no need for dedicated equipment for each as in the past, which is very convenient and reduces costs. It's gone.

Note that the display area for 2 guns/F unit 1 is 18 dots) x 20 rusks, 16 dots x 16 rusks, but this is n dots )
Of course, it is raster.

(f) More than the effects of the invention, as stated in B'('πmK theory), the display control method of the present invention adds a raster control circuit that switches and controls the number of rasters in one line of characters to the display control circuit of the conventional method. By adding a dot control circuit to switch and control the dot output of the parallel-to-serial conversion circuit, 92 types of display screens were created.
By performing display suitable for each display screen, conventional 2
The display that used to be done with several dedicated devices can now be done with one device, which is always convenient and reduces costs.

[Brief explanation of the drawing]

Fig. 1 is a control circuit block diagram explaining the conventional display control method, Fig. 2 (a) and (b) are planes rx, which connect the display areas of two types of display areas to two HB gates; )(
B) i-, J: A plan view for explaining the display of the display screen, 4th pHL. ) ゛Rock ゞJ
It is. Circled in the figure, 1 is a display 1-1 11 circuits, 2 is a code buffer, an LD double line buffer, and a 41 DI character generator. 5 is a parallel-to-serial conversion circuit, 6 is a rask control circuit, 7 is a dot-based 911 circuit, 8.10 is an AND circuit, 9 is an inverter circuit, and 11 is an OR circuit.

Claims (1)

[Claims] Based on the raster position output from the display control circuit and the code data from the code buffer, the character generator outputs a dot pattern, and the output is sent to the parallel-to-serial conversion circuit to output a video signal of the dot pattern. In the display control method for displaying text, a raster control circuit is added to the display control circuit to control switching of the number of rasters in one line of characters and change the line spacing, and further controls switching of the dot pattern output of the parallel-to-serial conversion circuit. A display control system characterized in that a dot control circuit is provided to change the character spacing, and 92 types of display screens are produced by switching control of the raster control circuit and the dot control circuit.