JPS6035074B2 - CRT display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a CRT display device widely used for communication between humans and computers in electronic computer systems, so-called man-machine interface.

A conventional CRT display device is a CRT (hereinafter simply referred to as CRT means a CRT display itself).

), a storage device (
Hereafter referred to as memory. ).
However, while displaying a part of a large screen that cannot be displayed simultaneously on a CRT, the screen being displayed is continuously shifted in an arbitrary direction (hereinafter referred to as panning). There is a request to display that part. To meet these demands, conventional general CRT display devices have used a method of "panning to the top" by sequentially rewriting the contents of the memory within the CRT display device using output from computer software. However, this method requires the software to process a large amount of data.
There were problems such as it took time to move the screen, smooth panning was not possible, and software processing placed a heavy load on the computer's arithmetic control unit. In order to eliminate this inconvenience, a CRT display device having a memory capable of storing more information than can be displayed on a CRT has been considered. The operation of this improved CRT display device will be explained using FIG. In FIG. 1a, 1 is a CRT capable of displaying 2×2=4 pixels. It is assumed that the screen 2 to be actually displayed is composed of 4×4=16 pixels as shown in FIG. 1b. The CRT display device also has a memory 3 capable of storing the contents of this 4×4=1 range element, as shown in FIG. 1c. A normal CRT can display a screen of about 8 blood pixels horizontally x 4 arm pixels vertically, and the memory of a CRT display device generally has a unit memory (2 pixels) of a corresponding size. However, for the sake of simplicity, the configuration as described above will be explained here. In FIG. 1a, the CRTI indicates that four pixels A, B, E, and F corresponding to x=0 and y=0 of the screen 2 shown in FIG. 1b are displayed. That is, the CRTI is configured to display two pixels in the x direction and two pixels in the Y direction from the pixel indicated by the coordinates (X, Y) of the memory 3. Therefore, F, G, J of screen 2 that you want to display
, K, the coordinate registers (X, Y) in the CRT display device may be changed to x=1, Y=1. This coordinate register (X, Y) can be changed using, for example, a joystick. As a result, the displayed contents of the CRTI can be moved quickly and smoothly without any computer software processing. but,
Depending on the information on the screen to be displayed, it may be inconvenient for the entire screen to be panned.

For example, there is generally a part on the screen where the title of the screen and the instruction items of the light ben are necessary for explaining or instructing the contents of the entire memory. It is inconvenient that such a portion disappears from the screen when the entire screen is panned as described above. The conventional CRT display device had the above-mentioned drawbacks. The present invention enables high-speed and smooth panning while reducing the load on the computer's arithmetic control unit.Moreover, in order to eliminate the above-mentioned drawbacks, a pre-specified area on the screen is not targeted for panning. The purpose of this invention is to provide a CRT display device having various functions.

The details of the present invention will be explained below based on an illustrated embodiment.

In Figure 2, Kawama's computer is shown, and 15 is a CRT display device.
It is composed of an RT controller 20 and a CRT 30. The CRT controller 20 receives display information from the computer 10 and performs control for displaying it on the CRT 30.
21 is an input/output interface that receives display information output from the computer 10; 22 is a display controller that distributes information input from the computer 10 via the input/output interface 21; and 23 is a display controller that receives the output of the display controller 22. A relatively large-capacity memory 24 for storing this information determines the address of the memory 23 to be read based on the contents of the panning flag section 27 and the coordinate register 28, and based on this address, 1
A memory scanner that sequentially reads out the contents written in the memory 23; 25, a pattern generation circuit having a preset pattern; and 26, a pattern generation circuit 26, which receives the read contents and outputs a corresponding pattern; This is a video signal generation circuit that converts the output from the CRT into a video signal and applies it to the CRT 30.

The CRT 30 performs display based on the applied video signal. On the other hand, memory 2 to be displayed on the CRT 30
Information giving the coordinates (x, Y) of 3 is sent to the coordinate register 28 via the display controller 22 together with the display information from the computer 10, or is sent to the shift signal control circuit 29 from an external device such as a joystick (not shown). It is sent to the coordinate register 28 via , and is set or changed. In addition, the flag indicating whether or not panning is possible is 1 when the flag is 1, panning is not possible, and the flag is 0.
When , it indicates that panning is possible, and is sent to the panning flag unit 27 via the display controller 22 and set. Note that CRT30 has a display function of 2×2=4 pixels,
The description will be made assuming that the memory has a storage capacity corresponding to 4×4:1 nodal pixels. Note that the panning flag section 27 has the same capacity as the number of unit memories of the CRT 30,
In this embodiment, 2×2;4 flags are required. Next, the operation of the present invention will be explained.

In the CRT display device 15 constructed in this manner, the computer 10 first writes a screen as shown in FIG. 8b into the memory 23, which is shown in FIG. 3c. Furthermore, the panning flag section 27 is set, for example, as shown in FIG. 3a. In such a state, the contents of the coordinate register 28 in the initial state are ×=0, Y
= 0, the memory scanner 24 scans the memory 23 based on the contents of the coordinate register 28, and the scan result is applied to the CRT 301 via the pattern generation circuit 25 and the video signal generation circuit 26. The screen shown in Figure 3d is displayed. Next, move the entire screen one digit to the right,
In order to pan one line downward, the shift signal control circuit 29 uses, for example, joysting (not shown).
Change the settings of the transit coordinate register 28 to X=1 and Y=1.

When the memory scanner 24 retrieves display information from the memory 23 in this state, the panning flag is 1 for i=0 and j=0, so no panning is performed and X in the memory 23 is 0.
, Y=0, the panning flag=0 for i=1, j=0, so the memory X=111=2, Y=100
Since the panning flag is 0 for the content G of =1 for i=0 and i=1, the content J of the memory X=100=1, Y=111=2 for i=1, i=1 Panning flag for =
Since it is 0, the contents K of the memory X=111=2 and Y=111=2 are taken out and displayed on the CRT 30 via the pattern generation circuit 25 and the video signal generation circuit 26.

Therefore, the display contents of the CRT 30 will be as shown in Figure 3e, and for i = 0 and j = 0, where panning is not set, the original A will be displayed, and for the other parts, the display will be moved one digit to the right and down. The screen is displayed panned one line. As explained above, according to the present invention, when panning a CRT screen in a computer, most of the panning operation is performed within the CRT controller, compared to the method of rewriting the entire memory corresponding to the CRT screen using a conventional device. This process can be performed without increasing the load on the computer's arithmetic and control unit.

Furthermore, fast and smooth screen panning is possible,
Further, it has the effect that necessary portions can be excluded from panning targets. It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope without changing the gist thereof.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the operation of a conventional CRT display device, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a diagram explaining the operation of the embodiment device shown in FIG. It is. 10... Calculator, 15... CRT display device, 20.
..CRT controller, 23.. storage device (memory), 24.. memory scanner, 25.. pattern generation circuit,
26... Video signal generation circuit, 27... Panning flag circuit, 28... Coordinate register, 29... Shift signal control circuit, 30... CRT display unit (CRT). Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] 1. A CRT display for displaying information; a storage device for storing information to be displayed on the CRT display that is larger than one screen worth of information that can be displayed on the CRT display; A register that holds coordinates that specify a portion of the stored content to be displayed on the CRT display, and a flag that specifies whether or not to pan a part of the screen when panning the screen displayed on the CRT display. and determining an address of the storage device for storing information to be displayed on the CRT display based on the coordinates of the register and the flag of the panning flag section; Displaying information on the CRT display based on the patterned output, comprising a device for reading content to be displayed from the storage device and a device for patterning and outputting the read content. A CRT display device characterized by: