JPS59220785A - Crt display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD The present invention relates to a CRT display device in which display line spacing can be arbitrarily set on a raster basis and scrolling can be performed in accordance with the line spacing.

Prior Art In recent years, computers have been introduced into general offices, and CR
T-display devices (hereinafter referred to as CRTs) are increasingly being used not only by FDP personnel but also by the general public. For this reason, there is an increasing need for CRTs to not only display alphanumeric characters only, or alphanumeric characters and katakana characters, but also to provide displays that are easy for the general public to understand. It has become a Noh performance. However, even when displaying edited text on a CRT with graphics and kanji, the line spacing between the characters is fixed, making the display of kanji etc. very difficult to see.
If the line spacing is large, there will be a lot of waste in displaying alphanumeric characters. For this reason, there are examples of changing the vertical size of letters for alphanumeric characters and kanji characters, but if the line spacing matches the alphanumeric characters, the kanji characters will be closer together at the bottom, making them difficult to read. For this reason, some CRT display devices are capable of switching between two stages (20-line mode, 25-line mode), but they are fixed at two stages, and it is not possible to display a mixture of the two stages at the same time.

The present invention has been made in view of the points mentioned above, and it is an object of the present invention to provide a CRT display device in which display line spacing can be set on a raster basis and an optimum line spacing is achieved in accordance with the display.

In addition, C has a scroll function corresponding to the set line spacing.
The purpose is to provide an RT display device.

Ru.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing a display example according to the present invention, and shows an example in which characters of different sizes are displayed simultaneously. Here, the vertical size of alphanumeric characters is 10. The size of kanji is assumed to be 15. In line 1.2, the line spacing raster is adjusted to 10 rasks, that is, the character size, and the largest number of characters can be displayed on the CRT. In Figure 1, between rows 2.3 and 15. row 3,
In this example, the number between rows 4 and 5 is set to 25, and the number between rows 4 and 5 is set to 15.

FIG. 2 is a block diagram of a CRT according to an embodiment of the present invention. In the figure, a CPU 1 is a microprocessor that controls various devices connected via a pass line, Ql. The pass line 11 consists of a data signal, an address signal, and a customer type control signal. CRT controller 2 is CPU
The multiplexer MPX3 is driven under the control of I to set an arbitrary address in the video RAM 4 as the start address of the display raster. Furthermore, one screen of video RAM 4 is read out from the start address of the display raster, and the read character pattern is converted from parallel to serial under the control of the CRT controller 2: converter 5 converts the parallel signal into a serial signal. and displayed on the CRT 7 via the video controller 6. This video RAM
4 is a human map that can be read and written.

Reading and writing of display data to and from the video RAM 4 is performed under the control of the CRT controller 2, but writing data, reading and reading addresses to the video RAM 4 are given by the character development scroll control circuit 8. . The details of this character development scroll control circuit 8 are shown in FIG. In FIG. 3, a character development circuit 9 receives a character code from the CPUI, and if it is a display character, develops a character pattern of a prespecified size onto the video RAM 4-1z. In addition, if it is a line feed "L F" code, the cursor is moved to the line below by the raster specified by the line spacing raster number register 10. If the cursor is at the bottom line, control is sent to the scroll control circuit 13. The scroll control circuit 13 is composed of an adder 11 and a display address register 12, and a row spacing raster register 1o.
and the display address register 12 in the adder 11, set the new display address in the display address register 12, and
The display start address is sent to the RT controller 2 and scrolling is performed.

When changing the display line and displaying on the next line, the line pitch is determined by the line spacing raster number register 10, so the raster corresponding to [line spacing raster number register 10] - [specified character pattern vertical size] Minute line spacing is required. In other words, when the display line spacing is as in line 3 in Figure 1, when the character size is lo pitch and the line spacing size is 15 pitches, the vertical spacing of 5 pitches is 1 line 4 in the display IIJI of line 2 and line 3. Noyogu font size is 15 pitch and line spacing is 2
If it is 5 pitches, there is an interval below 1o pitch.

The CRT controller 2 writes blank (b) information to the address of the video RAM 4 corresponding to the display interval indicated by L, and then writes display information from the CPUI to the video RAM 4 via the character expansion circuit 9. Here, character information l pitch (
Although we have shown an example in which 1 dot) is displayed in one raster scan, the same applies to the case where 1 pitch (1 dot) is displayed in multiple raster scans, that is, 1 pitch (1 dot) is displayed in multiple rasters. Control is sufficient.

By making it possible to freely change the line spacing in this way, it is possible to control not only cursor movement, but also scroll control and character display line pitch to a great extent simply by changing the number of line spacing rasters given to the line spacing raster number register. be. Therefore, information in various font sizes can be displayed efficiently and easily on a CRT display screen of 1 meter.

Furthermore, in the case of a character display, it is of course possible to freely change the display line spacing based on the designation of the line spacing raster number register, and is not limited to the bitmap type video RAM as described above.

Display information transmission control on the CPUI will be explained in detail using FIG. 4(A). As shown in the figure, the CPU only needs to send the number of rasters corresponding to the number of display line pitches to be displayed on the display screen to the line spacing raster number register 10 (step 40), and then send display information (step 42). After that, only when changing the display line pitch (step 44-Y)
The number of rasters between lines is stored in the number of rasters between lines register IO.

The reception and control of display information on the display device is shown in FIG. 4(B). As shown in the figure, when display information is received from the CPUI (
Step 50), first in step 52, the receiver checks whether the received display information is line feed information, and if it is not a line feed, step 5
4 outside the character pattern area generated by the character expansion circuit in the video RAM, that is, [line spacing raster number register]
"Blank" data is written in the part of the generated character pattern excluding the number of rasters (corresponding to the vertical pitch of the character size) from the set number, and then, in step 56, a character pattern corresponding to the display information is created by the character expansion circuit. and writes the generated data to the video RAM. Then, in step 58, the cursor is moved to the display position of the next character to prepare for receiving the next display information.

In step 52, if the received display information is line feed information, the receiver proceeds to step 60, checks whether the current display line is the bottom line of the display surface, and if it is not the bottom line, proceeds to step 66, moves the cursor to [ Move the video RA to the leftmost column position on the display screen below by the number of rasters specified in the
The write address to M is advanced by the specified number of rusks, and the next display information is ready to be received.

In step 60, if the current display line is at the bottom of the display screen, in order to scroll up on the display screen, step 62 indicates the address position at which reading from the video RAM is started for display on the display screen. The contents of the register] are counted up by the number of addresses corresponding to the number of rusks specified in the [line spacing rusk number register]. As a result, the display on the display screen is scrolled by the number of rusks specified by the [line spacing rusk number register]. Thereafter, the process proceeds to the aforementioned step 66, and the cursor position is moved to the bottom row and the leftmost column, and the next display information receiver is prepared for collection.

Effects As described above, according to the present invention, the number of line spacing rasters can be set arbitrarily, so it is possible to easily support the display of characters of various sizes on a CRT display device, and the line spacing can be set arbitrarily as needed. A new editing function that allows you to set

Further, by providing a scroll means according to the set line spacing, a more complete editing function can be realized.

[Brief explanation of drawings]

FIG. 1 shows a display example of a display device according to the present invention] Δ, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing details of the character development scroll control circuit shown in the figure. In the figure, 1...CPU, 2...CRT controller, 3...Multiplexer, 4...Video RAM
, 5... Parallel-serial converter, 6... Video controller, 7... CRT display unit, 8... Character development scroll control circuit, 9... Character development circuit, 1o.
...Line spacing rask number register, 11...Adder, 12.
...Display address register. Author: September 5, 1982, Mr. Commissioner of the Patent Office ■, Patent Application No. 58-94933 2, Title of invention CRT display device 3, Person making amendment Related Patent Applicant: Gyanon Co., Ltd., 3R, 30-2, Shimomaruko, Ota-ku, Tokyo, 4゜ 1-11-10 Toranomon, Minato-ku, Tokyo 105 7. Supplementary Statement of Contents, page 13, line 4 Correct the 9th line as shown below. 4. Brief explanation of the drawings Figure 1 is a diagram showing a display example of a display device according to the present invention. Figure 2 is a block diagram of an embodiment of the present invention. Figure 3 is a character expansion scroll of Figure 2. A diagram showing the details of the control circuit. FIG. 4(A) is a display information sending control flowchart of the device of this embodiment. FIG. 4(B) is a flowchart 1 of display information receiving control of the device of this embodiment. .”

Claims (2)

[Claims] (1) It is characterized by comprising a line spacing rask number setting means that can arbitrarily set the display line spacing on a rask basis, and a display means that performs display with a display line spacing corresponding to the number of rasters set by the line spacing rask number setting means. CRT display device. (2) a line spacing rask number setting means that can arbitrarily set the display line spacing in rask units; a display means that displays a display line spacing corresponding to the number of rasters set by the line spacing rask number setting means; and the line spacing rask number. and a scrolling means corresponding to the number of rasters set by the setting means, the scrolling means scrolling the display displayed on the display means by the number of rasters set by the line spacing rask number setting means. CRT display device.