JPS61275792A - Display unit - 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 [Industrial Field of Application J] The present invention relates to a display device capable of displaying a plurality of independent image information on one screen.

[Summary of the Disclosure] This specification and the drawings disclose a display device capable of displaying a plurality of independent image information on one screen, the display device capable of displaying at least two independent image information, wherein the image information at least two display memories for storing the information, and a mask memory for indicating an effective display area of the display memories;
display order determining means for determining the display order of the image information, and displaying areas of the display memory designated by each mask memory corresponding to the display memory in the order determined by the display order determining means. So,
This invention discloses a technology for a display device that makes it possible to quickly change the display order of multiple screens displayed on one screen.

[Prior Art J] Conventionally, when multiple pieces of image information are superimposed and displayed on a CRT or the like, the first method is to use software processing to superimpose the display information of these images in the desired display order. Created on display memory for one screen, CR
It was displayed on T. In the second method, a display memory is provided for each of a plurality of independent image information, and the order in which the display memories are superimposed is fixed by a circuit.By superimposing each image information according to that order, the C
'It was displayed on RT, etc. However, the first method described above requires a lot of time for software processing, and if you change the order of superimposition or, for example, shift the display information of a certain image vertically or horizontally, the new superimposition result It takes a long time to create screen information.

In addition, in the second method, the order of overlapping images is fixed, so in order to change the order of overlapping, the display memory of each image must be rewritten so that the desired overlapping plane is obtained. This requires a lot of processing time as it rewrites a large amount of information.

In this way, with conventional technology, in multi-screen display where multiple independent images are displayed on one screen, it is not possible to change the order in which each image is superimposed, or to generate or eliminate additional images for each superimposed image. has the disadvantage that it takes a lot of time.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide a display device that can quickly change the display order of a plurality of screens displayed on one screen. It is in.

Means for Solving Problem L] As a means for solving this problem, for example, the display device of the embodiment shown in FIG.
2, 22, and 32, a mask memory 11, 21, and 31 for indicating the effective display area of the display memory, and a matrix circuit 30 as display order determining means for determining the display order of the image information.

[Function J] In the configuration shown in FIG. 1, one display memory 12.22.
The valid areas of the display memories 12, 22, 32 designated by the respective mask memories 11, 21, 31 corresponding to 32 are sent to the display unit 43 for display in the display order determined by the matrix circuit 30.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Configuration diagram of display device (FIG. 1)] FIG. 1 shows a configuration diagram of a display device according to an embodiment of the present invention, and this example shows the configuration for displaying three screens. .

In the figure, 10 is a control unit that controls the entire device, and includes a microprocessor 100, ROMI 01, RAMIO 2, and the like. 11, 21, 31 are mask memories corresponding to each screen, 12, 22, 32 are display memories corresponding to each screen, and in each of these, 1 bit of each memory corresponds to 1 bit of the screen, and each display memory When the bits 12, 22, and 32 are 1, the dots are turned on, and when the bits are 0, the dots are turned off, and each memory has a capacity equal to the size of the dot on the screen. In addition, each mask memory 1
1, 21. When the bit 31 is 1, the information on the screen below that screen is enabled, and when it is O, it means that the information on the screen below is disabled and the display information on that screen is enabled. are doing.

30 is a matrix circuit that determines the display order of the display memory and mask memory for the three screens, that is, the superimposition order; when n screens can be displayed, nXn bits, 3 in this example;
In the case of a screen, it has a 3×3 bit memory 33, and the mask information bits (Mz, M2, M
3) Display information (Px, P2, P3)
3 screens worth of output (A M z ~ AM3.A
Px~AP3) is output. 41 and 42 are superposition circuits, 43 is a display unit such as a CRT, and 60 is a pass line for rewriting the memory 33.

Now, let us express the 3×3 transformation matrix by (Aij). Now, for example, if we take (Aij), then API = P2, Ar1 = Px, AP
3=P3, and the superimposition order is P2 * P x r
1 superposition circuit 41.4 to perform in the order of P 3
This means that it is output to 2. Similar transformations are CMx, M2, M
3) → (AMt, AM2, AM3) is also performed.

FIG. 2 shows an example of a screen displayed in the above-mentioned order of superimposition, and screen 13. A screen 14 displaying information on Px and a screen 15 displaying information on P2 are displayed in this order.

[Description of Matrix Circuit (FIG. 1) (FIG. 3)] FIG. 3 is an example of a matrix circuit 30 that implements the above matrix operation. In the figure, A11 to A33 each represent one bit of the memory 33 that stores a 3×3 matrix, and inputs P1.
P2. P3 is input from display memory 12, 22, 32 for three screens.

APz, Ar1, and Ar1 are the output data of the three screens after replacement. 300 to 308 are AND gate circuits,
309 to 311 are OR gate circuits. In addition, input information M 1 + M from each mask memory 11, 21.31
21 M 3 is also converted by a circuit having exactly the same circuit configuration as the circuit shown in FIG.
tj), AMl = M2, AM2 = M1. A
M3=M3.

This matrix circuit 30 generates input information P1 for three screens according to the numbers A11 to A33. Ml.

P2. M2, P3. M3 is reordered and A P
x + A M x + A P 2 1 A
M 2 1 A P 3 + A M 3 is output. Since Apl and AMP are the lowest screen, the signal AM, which determines the effectiveness of information on the lower surface and the black effect, is unnecessary.

41 is the information (A
P I A P 2) Make A P 2, and also 4
2 is the information ((APIAM
2) Ar1) AM3) This is a superimposition circuit that creates Ar1 and sends it to the display section 43. In this way, display information superimposed in the desired order is sent to the display unit 43.

On the other hand, the control section 10 can read and write the three display memories 12, 22.32 and the mask memories 11, 21.31 through data buses 51, 52.53, and can change the display contents of the display section. Further, matrix information ALL to A33 in the memory 33 of the matrix circuit 30 shown in FIG. 3 can be rewritten through the data bus 60, and thereby the overlapping order of the screens, that is, the display order can be changed based on the above-mentioned action. can.

[Explanation of the operation flowchart of the control unit (Fig. 1) (Fig. 4)] Fig. 4 shows an operation flowchart of the control unit 10. For example, the operation is started by input information from an input unit (not shown), etc. Ru. First, it is checked whether the information input in step S1 is information for changing the display data on the screen. If the information is changed, the process advances to step S2 and the display memory of the corresponding screen (
12, 22°32). On the other hand, if the display data is not changed in step S1, step S3
Go to , and check whether it is an instruction to create or delete one screen. In that case, proceed to step S4, and rewrite and update the mask memory (any of 11, 21, or 31) of the corresponding screen.
If the instruction is other than that in step S3, the process advances to step S5 to see if the display position of the screen has been changed. If not, the process advances to step S6 and other corresponding processing is performed.If the instruction is to change the display position, the process advances to step S7 and the contents of the conversion matrix in the memory 33 of the matrix circuit 30 are transferred to the bus 6.
Rewriting through 0 determines the overlapping order of the screens.

Note that although the present embodiment describes the case of three screens, the present invention is not limited to this. Furthermore, although each mask memory has been explained as having the same configuration as the display memory, it may also be specified by the number of lines or columns on the display screen, and the display memory can be enabled or disabled by the address of the display memory. You may also give instructions.

[Effects of the Invention] As explained above, according to the present invention, there is an effect that the display order of each display screen can be changed extremely easily and quickly.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a display device according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a display, FIG. 3 is a matrix circuit diagram, and FIG. 4 is a flowchart diagram showing the operation of a control section. . In the figure, 10... control unit, 11, 21. 31... mask memory, 12, 22. 32... display memory, 30...
・・Matrix circuit, 33・・Memory, 41.42・
...Superposition circuit, 43...Display section, 300-30
8...AND gate circuit, 309-311...OR
It is a gate circuit.

Claims (3)

[Claims] (1) A display device capable of displaying at least two independent pieces of image information, including at least two display memories that store the image information, a mask memory that indicates an effective display area of the display memory, and the image information. display order determining means for determining the display order of the display memory, and displaying areas of the display memory designated by each mask memory corresponding to the display memory in the order determined by the display order determining means. A display device characterized in that: (2) The display order determining means includes a storage means for storing n-th square matrix information for determining the display order, and the storage means is rewritable. Display device. (3) The display device according to claim 2, wherein the order of the n-th square matrix of the storage means corresponds to the number of display memories.