JPH087568B2 - Display controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a display device capable of displaying a plurality of independent image information on one screen.

[Summary of Disclosure] The present specification and drawings show a display device capable of displaying a plurality of independent image information on one screen, and a display device capable of displaying at least two independent image information. Each of the mask memories corresponding to the display memory, the display memory storing at least two display memories, a mask memory for designating an effective display area of the display, and a display order determining means for determining a display order of the image information. A display in which the areas of the display memory designated by the display order determination means are displayed in the order determined by the display order determination means, and the display order of a plurality of screens displayed on one screen can be changed at high speed. The technology of the device is disclosed.

[Prior Art] Conventionally, when a plurality of pieces of image information are superimposed and displayed on a CRT or the like, a first method is a result of superimposing display information of these images in a target display order by software processing. On the display memory for one screen, and
Etc. were displayed. As a second method, a display memory is provided for each of a plurality of independent image information, and the order of superimposition of the display memories is configured by a circuit, and the respective image information is superposed according to the order. By CRT
Etc. were displayed. However, in the first method described above, it takes a lot of time to process the software, and when the order of superimposing is changed, or when the display information of a certain image is vertically or horizontally shifted, the result of the new superimposing is generated. It takes a long time to create the screen information.

Further, in the second method, the order of superimposing images is fixed, so in order to change the order of superimposing, the display memory of each image is rewritten so that the target superimposing surface is obtained. This requires a lot of processing time because a large amount of information is rewritten.

As described above, according to the conventional technique, in the multi-screen display in which a plurality of independent images are displayed on one screen, it is possible to change the superposition order of each image, and to further generate and disappear an image in each superposed image. Has the drawback of taking a lot of time.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-described conventional example, and makes it possible to effectively superimpose an arbitrary plurality of independent image information and display the image information. It is an object of the present invention to provide a display control device capable of superimposing and displaying it on the screen of a display device based on mask information that indicates for each pixel whether to invalidate.

[Means for Solving the Problems] To achieve the above object, the display control device of the present invention has the following configuration. That is, a display control device capable of displaying at least two independent image information on a display device, and at least two display memories each storing the independent image information, and the stored image information of each of the display memories. A memory that stores order data for determining the stacking order, and a display memory that is provided corresponding to each of the display memories, and indicates for each pixel whether to enable or disable the display of the image information of the corresponding display memory. A mask memory for storing mask information, and a display order for determining an overlay order of the image information stored in each of the display memories and an output order of the mask information from the mask memory according to the order data stored in the memory. Determining means, based on the overlay order and the mask information determined by the display order determining means, The image information stored in the shown memory and a supply means for supplying to said display device.

[Operation] In the above configuration, at least two display memories each storing independent image information are stored in the sequence data memory for determining the superposition order of the image information, and the display memory is stored. The mask information is provided corresponding to each of the above, and mask information for instructing whether to enable or disable the display of the image information in the corresponding display memory is stored in the mask memory. According to the order data stored in the memory, the superposition order of the image information stored in each of the display memories and the output order of the mask information from the mask memory are determined, and based on the determined superposition order and the mask information. By supplying the image information stored in each display memory to the display device, each image information in the display memory operates so as to be displayed according to the superposition order and the mask information.

[Embodiment] As one means for solving this problem, for example, the display device of the embodiment shown in FIG. 1 is a display memory for storing image information.
12, 22, 32, mask memories 11, 21, 31 for designating an 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.

In the configuration shown in FIG. 1, the matrix circuit 30 determines the effective area of the display memories 12, 22, 32 displayed by the mask memories 11, 21, 31 corresponding to the display memories 12, 22, 32. The data is sent to the display unit 43 and displayed in the display order.

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 is a configuration diagram of a display device according to an embodiment of the present invention. In this example, a configuration for displaying three screens is shown. .

In the figure, 10 is a control unit for controlling the entire apparatus, and the microprocessor 100 includes a ROM 101, a RAM 102 and the like. 11,21,31
Is the mask memory corresponding to each screen, and 12,22,32 are the display memories corresponding to each screen.
One bit corresponds to one bit on the screen, and each display memory 12,22,
When the 32 bit is 1, the dot is turned on, and when the bit is 0, the dot is turned off. Each memory has a capacity corresponding to the dot size of the screen. When the bit of each mask memory 11, 21, 31 is 1, the information on the screen below that screen is valid, when it is 0, the information on the screen below is invalid and the display information on that screen is valid. It means to do.

Reference numeral 30 is a matrix circuit for determining the display order of the display memory and the mask memory for the above three screens, that is, the order of superimposition, n × n bits when n screens can be displayed, and three screens of this example. It has a memory 33 of 3 × 3 bits, and the mask information bits (M ₁ , M ₂ , M ₃ ) and the display information bits (P ₁ , P ₂ , P ₃ ) for the above three screens are exchanged for three screens. Output (AM _1- A
M _3, and outputs the AP ₁ ~AP _3). 41 and 42 are superposition circuits, 43
Is a display unit such as a CRT, and 60 is a bus line for rewriting the memory 33.

Now, when the 3 × 3 conversion matrix is represented by (Aij), Now, for example, (Iij) Then, AP ₁ = P ₂ , AP ₂ = P ₁ , AP ₃ = P ₃ and the superposition circuit 4 is arranged so that the superposition order is P ₂ , P ₁ , P _3.
It is output to 1,42. Similar conversion is (M ₁ ,, M ₂ ,, M ₃ ) →
It is also performed for (AM ₁ , AM ₂ , AM ₃ ).

FIG. 2 shows an example of the screens displayed in the above-mentioned stacking order. The screen 13 for displaying the information of P ₃ , the screen 14 for displaying the information of P ₁ , and the information of P ₂ are displayed in the above order. Screen 15 is displayed in that order.

[Description of Matrix Circuit (FIG. 1) (FIG. 3)] FIG. 3 shows an example of the matrix circuit 30 for realizing the above matrix operation. In the figure, A _{11 to} A ₃₃ indicate each one bit of the memory 33 that stores a 3 × 3 matrix, and the inputs P ₁ , P ₂ ,
P ₃ is the input from the display memories 12, 22, 32 for 3 screens, AP ₁ , AP
₂ and AP ₃ are output data of 3 screens after switching. 300 ~
308 is an AND gate circuit, and 309 to 311 are OR gate circuits.
Further, in the case where the input information M ₁ , M ₂ , M ₃ from each mask memory 11, 21, 31 is also converted by the circuit having the same circuit configuration as the circuit of FIG. 3 and the same conversion matrix (Aij) as described above is used. AM ₁ =
M ₂ , AM ₂ = M ₁ , AM ₃ = M ₃ .

With this matrix circuit 30, according to the value of A ₁₁ = A ₃₃ ,
3 screens input information _{P 1, M 1, P 2} , M 2, P 3, M 3 the order is _{interchanged, AP 1, AM 1, AP} 2, AM 2, AP 3, AM 3 and Do connexion output To be done. Since AP ₁ and AM ₁ are the lowest screens, the AM ₁ signal that determines whether the information on the surface below it is valid or invalid is unnecessary.

41 information superimposed second surface on the AP ₁ on the first surface ((AP ₁ ∩
AM ₂ ) ∪AP ₂ ) is created, and 42 also creates information ((AP ₁ ∩AM ₂ ) ∪AP ₂ ) ∩AM ₃ ) ∪AP ₃ ) on which the third surface is overlaid, and the display section 43 It is a superposition circuit for sending to. In this way, the display information superimposed on the display unit 43 in the desired order is sent.

On the other hand, the control unit 10 can read and write the three display memories 12, 22, 32 and the mask memories 11, 21, 31 through the data buses 51, 52, 52 and can change the display contents of the display unit. or,
It is possible to rewrite the matrix information A _{11 to} A ₃₃ of the memory 33 of the matrix circuit 30 of FIG. it can.

[Explanation of the operation flow chart of the control unit (Fig. 1) (4th
(FIG.)] FIG. 4 shows an operation flow chart of the control unit 10. For example, an operation is started by input information from an input unit (not shown) or the like. First, check whether the information input in step S1 is the change information of the display data on the screen. If it is the change information, go to step S2 to display the corresponding screen display memory (12,2
Change either 2, 32). On the other hand, if the display data cannot be changed in step S1, the process proceeds to step S3, and it is determined whether the instruction is screen generation or deletion. In that case, the process proceeds to step S4, and the mask memory (any one of 11, 21, 31) of the corresponding screen is rewritten. If any other instruction is given at step S3, the process proceeds to step S5 to see if the display position of the screen is changed. If not, the process proceeds to step S6 to perform other corresponding processing. If a display city change instruction is given, the process proceeds to step S7 to rewrite the contents of the change matrix of the memory 33 of the matrix circuit 30 through the bus 60 to superimpose the screen. To decide.

In the present embodiment, the case of three screens has been described, but the present invention is not limited to this. Although each mask memory has been described as having the same configuration as the display memory, it may be designated by the number of lines or columns on the display screen.

[Effects of the Invention] As described above, according to the present invention, each of a plurality of arbitrary independent image information is enabled or disabled to superimpose the image information and display of the image information. According to the mask information designated for each pixel, it is possible to superimpose and display on the screen of the display device, and a desired image can be displayed no matter how the superposition order is changed.

[Brief description 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 display, FIG. 3 is a matrix circuit diagram, and FIG. 4 is a flow chart showing the operation of a control unit. is there. In the figure, 10 ... control unit, 11, 21, 31 ... mask memory, 12, 2
2,32 ... Display memory, 30 ... Matrix circuit, 33 ... Memory, 41,42 ... Overlap circuit, 43 ... Display section, 300-
308 ... AND gate circuit, 309-311 ... OR gate circuit.

Claims (1)

[Claims] 1. A display control device capable of displaying at least two independent image information on a display device, wherein at least two display memories each storing the independent image information, and each of the display memories are stored. A memory that stores order data for determining the order of superimposing image information, and a memory that is provided corresponding to each of the display memories and that enables or disables the display of the image information in the corresponding display memory. A mask memory for storing mask information for instructing each pixel; an overlay order of image information stored in each of the display memories according to order data stored in the memory; and an output order of mask information from the mask memory. A display order determining unit that determines the display order, and an overlaying order and the mask information that are determined by the display order determining unit. And supply means for supplying the display device with the image information stored in each display memory, and the mask information and the overlay order determined by the display order determining means for the respective image information in the display memory. A display control device characterized in that the display is performed according to.