JPS6035075B2 - CRT display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a CRT display device used as a manual interface device in an electronic computer system.

A conventional CRT display device is a CRT (hereinafter simply referred to as CRT means the CRT display device itself, which is one component of a CRT display device).

) is generally equipped with a storage device (hereinafter referred to as memory) that stores display information within a range that can be displayed. However, while displaying a part of a large screen that cannot be displayed simultaneously on a CRT, the screen being displayed is continuously moved in any direction (hereinafter referred to as panning) to move the desired part of the large screen. There is a request to display a portion. In response to such demands, conventional general CRT display devices have
A method is used in which the contents of the T device's internal memory are sequentially rewritten by output from computer software to perform sequential panning.

However, this method requires the computer software to process a large amount of data, so it takes time to move the screen and smooth panning is not possible. There have been problems such as an increase in the load on the device, which may interfere with the computer's normal business processing. 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 device will be explained using FIG. FIG. 1a shows a CRTI capable of displaying 2×2=4 pixels. Assume that the large screen 2 to be actually displayed is composed of 4×4=1 printing pixels as shown in FIG. 1b. As shown in FIG. 1c, the CRT display device has a memory 3 capable of storing the contents of 4×4=1 printed pixels. A normal CRT has a size of about 8 pixels horizontally x 4 pixels vertically, and the memory of a CRT display device also generally has a corresponding unit memory (=pixel), but here we will explain briefly. Therefore, the description will be made assuming a 2×2 pixel CRTI and a 4×4 pixel memory 3. CR shown in Figure 1a
TI is 4 pixels A corresponding to x=0, y=0 in screen 2,
This indicates that B, E, and F are displayed. In other words, the CRT display device displays 2 pixels in the x direction and 2 pixels in the y direction from the pixel indicated by the coordinates (X, Y) of the memory 3, a total of 2×2 pixels.
=4 pixels are configured to be displayed on the CRTI.
Therefore, when displaying F, G, J, and K on screen 2, C
Set the coordinate register (×, Y) in the RT display device to ×=1, Y
; Just change it to 1. This coordinate register (×, Y)
By making changes using, for example, a joystick or the like, it is possible to pan the CRT display contents at high speed and smoothly without any computer software processing. However, depending on the content of the screen to be displayed, panning the entire screen may be inconvenient.

For example, there are generally areas on the screen that are necessary for explaining or giving instructions about the contents of the entire large figure, such as the title of the screen, comments for the entire screen, and instruction items. It is inconvenient that such an area disappears from the display area of the CRT when the entire screen is panned as described above. In the example of the screen displayed on the CRTI shown in Figure 1a, for example, if B is the title of this screen and is an area that should not be erased by panning, the coordinate flag (X, Y) = (1, 1) It is desirable that a screen 4 as shown in FIG. 1(d) be displayed after . On the other hand, there has been a conventional method of superimposing CRT screens. This method will be explained with reference to FIG. As shown in Figure 2 a, 2×2=
There is a CRT display device which has two sets of memories, a memory 5 and a memory 6 each consisting of four pixels, and can display the contents on a CRT 7 by superimposing them with video signals.

In the example, if A and C are stored in memory 5 and B and D are stored in memory 6, and these are superimposed and displayed at the video signal level, C
This shows how A, B, C, and D are displayed on RT7. A case will be described in which a large screen memory capable of panning is used on one side of a CRT display device having such a superposition function. In Figure 2b, memory 8 is a large screen memory consisting of 4 x 4 pixels, and memory 9 is a memory consisting of 2 x 2 pixels, and the contents of memory 8 and memory 9 are superimposed at the video signal level. displayed on the CRT7.

When the contents of each of these memos IJI are stored as shown in Figure 2b, the large screen coordinate axes (X, Y
); In the case of (0,0), a screen with contents as shown in FIG. 2c is displayed on the CRT 7.

However, if you change the large screen coordinate axes to (X, Y) = (1, 1), the display contents of the CRT 7 will become as shown in Figure 2 d, and C
B and G overlap on the RT7 screen, making them unreadable in some cases. The present invention enables high-speed and smooth panning without placing a load on the arithmetic control unit of the computer, and in order to eliminate the above-mentioned inconvenience, the area on the CRT screen specified by the computer is overlapped. The object of the present invention is to provide a CRT display device that is not subject to the

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

In FIG. 3, 10 is a computer, and 15 is a CRT display device. Display information from the CRT controller 20 and the computer 10 is output to the CRT controller 20, subjected to necessary processing, and displayed on the CRT 35. Display information is stored in the first memory 23A or the second memory 23B via the input/output interface 21 and the display controller 22. Whether to store in the first memory 23A or the second memory 23B is switched by a command signal given from the computer 10 to the display controller 22. The contents of the first memory 23A or the second memory 23B are periodically retrieved by the first or second memory scanner 24A, 24B, and the first or second pattern generating circuit 25A, 25B is used to generate the pixel signal according to the code. is generated, converted into a video signal by the first or second video signal generation circuit 26A, 26B, superimposed by the video signal mixer 27, and sent to the CRT.
35. Here, the first memory 23A has a memory size equivalent to the large screen mentioned above, and the second memory 238
has a memo IJ size equivalent to a single screen.

On the other hand, the coordinates (×
. It looks like this. Furthermore, there is a first erasure flag section 28A that specifies whether to perform pixel conversion on the contents of the first memory 23A.
4A does not generate a pattern in the area specified by this flag (that is, when flag=1).

Setting/resetting of the first erasure flag section 28A is performed by a command signal given from the computer 10 to the display controller 22. Note that the first memory 2
3A, first memory scanner 24A, first erase flag unit 2
8A and the first coordinate register 29A constitute the first storage unit 31, and the second memory 23B and the second memory scanner 2
4B constitutes the second storage section 32.

Next, the operation of the present invention will be explained using FIGS. 3 and 4.

For simplicity, the first memory 23A in FIG. 3 has 4×4 pixels, the second memory 23B has 2×2 pixels, and CRT3
5 will be explained using a CRT display device 15 having a capacity of 2×2 pixels as an example. Regarding the first memory 23A, the first erasure flag section 28A, which instructs whether or not to generate a pattern, is
There are flags corresponding to the same number of pixels as the screen of the RT35, and in this example, 2×2=4 flags are required. In the CRT display device 15 configured in this way, first, the computer 10
'For example, information representing screens as shown in FIGS. 4a and 4b is written into the first memory 23A and the second memory 23B, respectively.

Furthermore, for the area where the first memory 23A and the second memory 23B are not overlapped, the first memory 23A and the second memory 23B are
The erase flag section 28A is set. In this state, if the first coordinate register 29A is in the initial state x=0, Y=0, the first memory scanner 24A sets the first erase flag section 28A (U, V) = (1, 0). Since no conversion is performed for the corresponding unit memo in the first memory 23A, the pixel output of the first pattern generation circuit 25A is blank at the screen coordinates (i, i) = (1, 0). The result will be something like Figure 4d. On the other hand, the second memory scanner 24B
Since the coordinates, erasure flag, etc. are irrelevant, the pixel output as shown in FIG. 4e can be obtained. When these are converted into video signals and superimposed by the video signal mixer 27, the CR
At T35, a surface screen as shown in FIG. 4f is obtained. Next, assume that the settings of the large screen memory coordinate axes are changed, for example, to (x, Y)=(1, 1) using an external device such as the joystick 40.

At this time as well, the first erasure flag section 28A (U, V) = (1,0
) is not converted to the unit memory IJ of the first memory 24A, so the output of the first pattern generating circuit 25A becomes as shown in FIG. 4g. On the other hand, since the second memory 23B is the same as before, a pixel output as shown in FIG.
The RT35 will display a screen as shown in Figure 4h. This means that on the display screen, the area corresponding to the area where the erase flag is reset is panned one line each in the X and Y directions, and the area corresponding to the area where the erase flag is set is changed to the x and Y values. Certain things are displayed. Furthermore, the CR of the present invention
The logic circuit of the T-controller 20 can be easily realized using a microcomputer, which has been rapidly developed in recent years, and its firmware.

In addition, in the above explanation, the first memory is a large screen memory and the second memory is a normal size memory. Unions are free to form groups.

Next, it is also possible to realize a CRT display device in which not only the first storage section but also the second storage section includes a second memory of a large screen memory, a second coordinate register, a second erase flag section, and a second memory scanner. It is.

Furthermore, in the above-mentioned embodiment, the device has two sets of pattern generation circuits and two video signal generation circuits, each corresponding to a memory scanner, and superimposes the outputs of the video signal generation circuits with a video signal mixer, and outputs the results to a CRT. As explained above, the present invention superimposes the outputs of two memory scanners and then performs CR without the need for a video signal mixer using one pattern generation circuit and one video signal generation circuit.
It is also possible to implement it as a CRT display device. After the above explanation, according to the present invention, when superimposing CRT display screens by a computer, areas that do not require superimposition can be arbitrarily specified from the computer, and depending on the combination with a large screen memory, the computer can To provide a CRT device capable of high-speed and smooth panning of necessary areas on a CRT screen and always displaying a constant screen in unnecessary areas without increasing the load on a computer control unit. I can do it.

[Brief explanation of the drawing]

1 and 2 are diagrams explaining the operation of a conventional CRT display device, FIG. 3 is a block diagram of an embodiment of the device of the present invention, and FIG. 4 is an operation of the embodiment of the device shown in FIG. 3. FIG. 10... Calculator, 15... CRT display device, 23A
...first storage device (first memory), 23B...second
24A...first memory scanner, 24B...second memory scanner, 28A...first erasure flag section, 29A...first coordinate register, 31...
・1st word self section, 32...2nd memory section, 35...C
RT display (CRT). Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A CRT display that displays information, and a first CRT display that stores information that should be displayed on the CRT display and that is larger than one screen worth of information that can be displayed on the CRT display. The CR among the contents stored in the storage device and the first storage device
The first one that holds the coordinates that specify the part to be displayed on the T display.
a register; a first erasing flag portion having a flag specifying whether or not to output a part of the contents of the first storage device to be displayed on the CRT display; coordinates of the first register and the first erasing flag; Based on the flag of the CR
a first device that determines an address of the first storage device that stores information to be displayed on the T display and reads out content to be displayed from the first storage device based on this address; a second storage device that stores information to be displayed on the CRT display and whose capacity is greater than the amount of information for one screen that can be displayed on the CRT; and contents stored in the second storage device. a second device that determines an address of the second storage device that stores information to be displayed on the CRT display, and reads out content to be displayed from the second storage device based on this address; a second storage unit;
A CRT display device comprising: displaying information on the CRT display based on the output of the first storage unit and the output of the second storage unit. 2 Claims characterized in that the second storage unit comprises a second storage device that stores information for one screen to be displayed on a CRT display, and a second device that reads the contents of the second storage device. The CRT display device according to item 1. 3. A second storage unit stores information for one screen to be displayed on a CRT display, and determines whether or not a part of the contents of the second storage device to be displayed on the CRT display can be output. Claims characterized by comprising: a second erasure flag unit having a designated flag; and a second device that reads the contents of the second storage device based on the flag of the second erasure flag unit. CRT display device according to item 2. 4 a second storage device in which a second storage section stores information to be displayed on a CRT display, which is more information than one screen worth of information that can be displayed on the CRT display; a second register for holding coordinates for specifying a portion of the content to be displayed on the CRT display;
a second erasure flag section having a flag specifying whether or not to output a part of the contents of the second storage device to be displayed on the T display, and a coordinate of the second register and a flag of the second erasure flag section; a second device that determines an address of a second storage device that stores information to be displayed on the CRT display, and reads out content to be displayed from the second storage device based on this address; 2. The CRT display device according to claim 1, wherein the CRT display device has a blank shape.