JPH0230513B2 - CRTHYOJISOCHI - Google Patents

Description

[Detailed description of the invention]

(a) Technical Field The present invention relates to a CRT display device, particularly to a CRT display device used as a man-machine interface device in an electronic computer system. (b) Conventional technology Conventional CRT display devices are called CRT (hereinafter simply CRT).
If it is written as , it is a component of a CRT device.
means CRT display. ) is generally equipped with a storage device that stores display information within the range that can be displayed. However, while displaying a portion of a large screen that cannot be displayed simultaneously on a CRT, there is a need to continuously move the currently displayed screen in any direction to display a desired portion of the large screen. For such requests, the conventional general
In the case of a CRT display device, this was done as follows.
That is, a method has been used in which the contents of a storage device within a CRT display device are successively rewritten by outputs from the computer itself, thereby moving the screen in sequence. However, with this method, the computer must process a large amount of data in order to output the display information, so it takes time to move the screen, making it difficult for the user to move smoothly, and the computer has to process a large amount of data. Because of this data processing, the load on the computer itself becomes heavy, which poses problems such as the possibility of interfering with business processing on the computer itself.
In order to eliminate this inconvenience, CRT display devices are being considered that have a storage device that can store more information than can be displayed simultaneously on a CRT. First, the operation of the improved CRT display device described above.
This will be explained in the figure. FIG. 1a shows a CRT 1 capable of displaying 2×2=4 pixels. Here, it is assumed that the large screen 2 to be actually displayed is composed of 4×4=16 pixels, as shown in FIG. 1b. The CRT display device has a storage device 3 capable of storing the contents of 4×4=16 pixels as shown in FIG. 1c. A normal CRT display device has a width of 80 x height of 40
= It has a display capacity of about 3200 pixels, and the storage device of a CRT display device also generally has a unit memory (pixel) corresponding to this, but here, for the sake of simplicity, we will use a CRT1 with 2 x 2 pixels and a CRT1 with 4 pixels. ×4 pixel CRT
The following explanation assumes that the storage device 3 is used. The CRT 1 shown in Fig. 1a has X=0 in the screen 2,
This shows that a total of four pixels A, B, E, and F, two pixels to the right and two pixels downward from Y=0, are displayed. That is, this CRT display device is configured so that a total of 4 pixels, 2 pixels in the X direction and 2 pixels in the Y direction, can be displayed on the CRT 1 from the pixel indicated by the coordinates (X, Y) of the storage device 3. . Therefore, in order to display F, G, J, and K on screen 2, set the coordinate registers (X, Y) in the CRT display device to X=1, Y=
Just change it to 1. By rewriting this coordinate register using, for example, a joystick,
It is possible to move the CRT display screen without performing any processing on the computer itself. However, depending on the content of the screen to be displayed, it may be inconvenient for the entire screen to move. For example, there are generally areas on the screen necessary for explaining the contents of the entire large screen, such as the name of the screen, comments for the entire screen, and a light pen reception area. It would be inconvenient for such an area to disappear from the CRT display screen due to screen movement as described above. Shown in Figure 1a
In the example of the screen displayed on the CRT1, if B is the name of this screen and it is an area that should not disappear when the screen moves, then the coordinate flags (X,
When Y)=(1, 1), it is desirable that a screen 4 as shown in FIG. 1d be displayed. On the other hand, a conventional method of superimposing CRT screens will be explained with reference to FIG. As shown in FIG. 2a, a storage device 5 consisting of 2×2=4 pixels,
It has two sets of storage devices, storage device 6, and stores this content.
Can be displayed by superimposing video signals on CRT7
It is a CRT display device. In the example, the storage device 5 has A,
C, B, D in the storage device 6, and display them superimposed on each other, A, B, C,
This shows how D is displayed. A case will be described in which a large-screen storage device capable of screen movement is used as one of the storage devices of a CRT display device having such an overlapping function. In FIG. 2b, the storage device 8 is a storage device for a large screen consisting of 4×4 pixels, and the storage device 9 is a storage device for a large screen consisting of 4×4 pixels.
The CRT 7 displays the contents of the storage device 8 and the contents of the storage device 9 superimposed at the video signal level. When these storage devices store data as shown in FIG. 2b, if the large screen coordinate register (X, Y) of the storage device 8 = (0, 0), A screen with contents as shown in c is displayed on the CRT 7. However, the large screen coordinate register (X, Y) =
If you change it to (1, 1), B and G will appear on the CRT7 screen.
may overlap and become unreadable in some cases. Furthermore, in such a case, the contents G of the storage device 8
Deciding in advance whether to display the content B of the storage device 9 or the content B of the storage device 9 results in a lack of flexibility as a CRT display device. Depending on the content of the screen to be displayed, you may want to display the contents of the storage device 8 with priority, or you may want to display the contents of the storage device 9 with priority, or you want to display the contents of the storage device 9 with priority, or you want to display the contents of the storage device 9 in a superimposed manner (a state obtained by taking a logical OR). In some cases, you may want to display only the matching part of the pattern (the result of the logical product). (c) Purpose of the Invention The present invention was made with the aim of solving the above-mentioned problems, and it is possible to move the screen at high speed and smoothly without putting a load on the main body of the computer. The purpose of this invention is to provide a CRT display device that can perform necessary overlapping processing on areas on the CRT specified by the computer itself. (d) Examples Examples will be described below with reference to the drawings. FIG. 3 is a block diagram of an embodiment of the CRT display device according to the present invention, and FIG. 4 is a diagram for explaining the operation. In Figure 3, 10 is a calculator and 15 is a CRT.
The display device consists of a CRT controller 20 and a CRT display 30. The CRT controller 20 is
Display information and control information are received from the computer 10 and sent to the first storage device 2 via the input interface 21 and display controller 22.
3A, or the second storage device 23B, or the overlapping code storage device 27, or the coordinate register 28. A first storage device 23A, a second storage device 23B, a superimposed code storage device 27,
The command is determined by the display controller to determine which of the coordinate registers 28 the display information and control information are for, and the command is stored and set in a designated location. The superposition circuit 24 periodically superimposes the contents of the first storage device 23A and the contents of the second storage device 23B pixel by pixel while referring to the contents of the superposition code storage device 27 and the coordinate register 28. Process. The superimposed display information is converted pixel by pixel into a pixel pattern signal corresponding to the code by the pattern generation circuit 25, and further converted into a video signal by the video signal generation circuit 26.
It is displayed on the CRT display 30. Here, the first storage device 23A has a size equivalent to the large screen mentioned above, and the second storage device 23B
shall have a size equivalent to a CRT display. On the other hand, at a certain point, the coordinate register 28 that provides the coordinates (X, Y) on the memory of the first storage device 23A to be displayed on the CRT display 30 is stored in the computer 1.
0 by a command signal given to the display controller 22, or by a signal sent from an external device such as a joystick 40 via a shift signal control circuit 29. Further, the contents of the first storage device 23A and the contents of the second storage device 23B are changed to the first storage device 23B according to the contents of the superimposition code storage device 27 at the corresponding coordinate position, as shown in Table 1.
A superimposition of priority on the storage contents of the storage device, an overlay of priority on the storage contents of the second storage device, a pixel pattern corresponding to the first storage device storage content code, and a pixel pattern corresponding to the second storage device storage content code. Various overlay methods are possible, such as overlaying a pixel pattern with a logical sum of , overlaying a pixel pattern with a logical AND, and overlaying a pixel pattern with an exclusive OR. shall be.

【table】

[Table] Next, the operation of the present invention will be explained using FIGS. 3 and 4. Here, for the sake of simplicity, the first storage device 23A in FIG. 3 has 4×4 pixels, the second storage device 23B has 2×2 pixels, and the CRT display 30 has 2×4 pixels.
The explanation will be given assuming that it has a capacity of ×2 pixels. Further, the superimposed code storage device 27 needs to have the same capacity as the CRT display 30, and in this example, codes corresponding to 2×2=4 pixels are required. In the CRT display device configured as described above, the computer 10 writes information representing screens such as those shown in FIGS. 4a and 4b to the first storage device 23A and the second storage device 23B, respectively. Furthermore, a superimposition code is set in the superimposition code storage device 27, for example, as shown in FIG. 4c. The meanings of the superimposition codes are as shown in Table 1. In this state, if the coordinate register 28 is (X, Y) = (0, 0), the superposition circuit 24 creates display data by referring to the superposition code, so the CRT display 30 The above display content yields a screen as shown in FIG. 4d. Next, assume that the large screen memory coordinate axes are set to (X, Y)=(1, 1), for example, by an external device such as the joystick 40. Contents of first storage device 23A, second storage device 23
Assuming that there are no changes to the contents of B and the contents of the superimposed code storage device 27, the contents displayed on the CRT display will be as shown in FIG. 4c. That is, FIG. 4d,
Comparing e, the screen stored in the first storage device moves toward the lower right as the coordinate register moves, but the screen stored in the second storage device 27 moves toward the lower right. The portion set as device priority remains displayed on the screen without moving. In this way, specified areas on the screen, such as the area that displays the screen name, the area that displays the screen display time, and the area that displays the light pen instruction command, are displayed regardless of the movement status of the large screen. Areas where there is a need can be prevented from moving. Also, superposition code, logical sum,
By using AND and exclusive OR codes, it is possible to combine pixel patterns for each pixel, and various overlapping displays are possible. The logic circuit of the CRT controller 20 can be easily realized using an LSI such as a microcomputer and its firmware. In addition, in the above explanation, the first storage device has a large screen and the second storage device has a normal size screen, but both devices may have a large screen, a normal size screen, and the storage device The combinations are free, such as n sets. (e) Effects of the Invention As explained above, according to the present invention, an overlapping code storage device is provided for a first storage device corresponding to a large screen and a second storage device equivalent to a CRT display, and I configured it to move the screen and process the overlapping according to the code, so
It is possible to freely specify the overlay logic for each pixel on the display screen, and in particular, the usability of CRT display devices with large screen storage devices can be greatly improved.

[Brief explanation of drawings]

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, 2
0...CRT controller, 30...CRT display, 40...Joystick, 21...Input interface, 22...Display controller, 23A...First storage device, 23B...Second
storage device, 24...superposition circuit, 25...
Pattern generation circuit, 26...Video signal generation circuit, 27...Superposition code storage device, 28...
...Coordinate register, 29...Shift signal control circuit.

Claims (1)

[Claims] 1. In a CRT display device capable of displaying storage contents from a storage device and moving the display screen, the storage device has a first storage device having storage contents equivalent to a large screen, and a CRT display device having storage contents equivalent to a CRT display. A second storage device, a superimposition storage device that determines screen movement for each of the first and second storage devices, and a computer, and a superimposition code is arbitrarily generated based on the output from the computer. A CRT display device characterized in that the above-mentioned pieces of stored information are arbitrarily superimposed and displayed by changing settings.