JPS62165688A - 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] [Table of Contents] Overview Industrial Application Fields Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Actions Examples Effects of the Invention [Summary] For multiple displays In a display device having a memory plane, each of one or more display memory planes has an address register for setting a display start position and one memory address to be displayed, independently of other display memory planes. By providing a counter that sequentially counts Ha, the display position of one or more display memory planes can be set and changed independently of other display memory planes. .

[Industrial application field]

The present invention relates to a bitmap type display device, and particularly has a function of setting and changing the display area of one or more display memory planes on the display independently of other display memory planes. The present invention relates to a display device that can easily realize display effects such as holding and dragging.

With the recent improvements in the performance of computer systems, it has become possible to freely handle line drawing data, image data, etc. that require a large amount of processing.

Particularly in the publishing industry, for example, when creating manuals for a company, it is possible to simulate the layout of an 8-year manual on a display by moving the line image or image image to an arbitrary position. is required.

In addition, in the computer system industry, etc., on a design drawing of a printed circuit board, etc., it is possible to move a mounting component (for example, a highly integrated circuit (IC)) to an arbitrary position and, for example,
It is necessary to simulate the wiring and design the optimal printed circuit board.

Alternatively, in fields that handle large drawings such as maps and design drawings, large drawings can be displayed on a display, for example.
When performing conversation processing, it is required to be able to display any part of the large drawing, visually confirm it, and make corrections such as adding or deleting figures with a small amount of memory.

For this reason, there has been a demand for a display device that can freely move a specific image among line images or image images, or display large-screen drawings with a small amount of memory while scrolling.

[Conventional technology]

FIG. 4 is a diagram schematically showing the display function of a conventional display device, and FIG. 5 is a diagram illustrating the correspondence between the display memory plane and the area displayed on the actual display screen. FIG. 6 is a diagram showing a configuration example of a two-dimensional arrangement of display memory planes.

Here, the display memory plane (PI~
P8) 6. It is assumed that the conversion table (LυT) 7 stores data necessary for display from a central processing unit (CPU, not shown).

First, prior to the display operation, the display position control unit 1
As shown in the figure, the "degree shift" between the origin and one display area of a plurality of display memory planes (Pi to P8) 6 included in the display device is defined as an X address.

The Y address is set in the X address register 2 and the X address register 3, respectively.

The X address register 2 specifies the position of each bit in one word (for example, 16 bits/32 bits/64 bits, etc.) that is read out simultaneously. It consists of part 21.

Figure 6 shows the display memory plane (Pi-P8)
6 shows the two-dimensional arrangement of 0.1. -・,i,i
+1.・-・・21. ...-, etc. indicate the above °words.

Here, in the display position control unit 1, when the central processing unit (CPU) starts displaying image data on a display (not shown), the X address register 2. The contents of the X address register 3 are respectively stored in the X counter 4. Transferred to X counter 5.

Thereafter, the X counter 4 is counted up in units of pixels displayed on the rask scan type display.

At this time, the access speed for each pixel is extremely high, so the n part 42 of the X counter 4 is configured separately from the upper n part 41, and the n part 41 is is counted up.

When the display of one display raster is completed, the contents of the X address register 2 are transferred to the X counter 4 by a signal from the display position control section 1, and the X counter 5 operates to count up.

That is, the l of a Rusk scan type display (CRT)
The pixels corresponding to the rask are specified by the X counter 4, and the X counter 5 is counted up for each display rask.

In this way, when the display of one screen is completed, the contents of X address register 2 and X address register 3 are changed to
Counter 4. It is retransferred to the X counter 5. By repeating this operation, it is possible to display, for example, 60 frames per second.

Above, data transfer to X counter 4, or? , When the count up of the n part 41 of the IX counter 4 occurs,
The contents of the display memory plane (Pi to P8) 6 are read out and stored in the output register 61.

Among the contents of this output register 61, the pixel specified by the value of L bart 42 of the X counter 4 is selected by the selector (SE
After passing through a conversion table (LUT) 7 and a D/A converter (DAC) 8 that converts the digital signal of the conversion table (LIT) 7 into an analog signal, it becomes a video signal, as shown in the figure. Not displayed on a Rusk scan type display.

In reality, reading the display memory plane (PI to P8) 6 takes time, so the memory plane (Pi to P8) 6 is read out.
When the data of P8) 6 enters the output register 61, the L bit 42 of the (Controlled as follows.

In addition, the L part 42 of the above-mentioned X counter and the select (SE
+, ) 62 may be composed of a shift register or the like that operates equivalently.

In the above display process, the display data stored in the plurality of display memory planes (Pi to P8) 6 is stored in the conversion table (LOT) 7 from the central processing unit (CPU) prior to the above display operation. Color gradation data corresponding to each pixel is stored.

For example, if the display memory planes (Pi to P8) 6 are composed of eight planes as shown in the figure, each pixel can display colors of 2''=256 gradations.

In other words, eight display memory planes (
The conversion table (LOT
) 7 is accessed and the address indicated by the pixel is
Preset color gradation data (so-called 3 colors of red, green, and blue)
Displayed in color gradation determined by, for example, 4-bit data specifying the strength of the primary colors.

[Problem that the invention seeks to solve]

Recently, in order to improve the operability of graphic processing, it has become common to visually simulate tasks that were previously performed manually on a computer system display (CRT).

As one of these methods, the target figure (image data)
There is so-called dragging, in which a target image is displayed on the display (CRT) and the target image is moved in accordance with the movement of the cursor using a cursor function provided in the display device.

At this time, in the display device according to the above-mentioned prior art, as is clear from FIG. PI~P8) 1 to 6
Since only the set is prepared, in order to perform the above dragging, the figure to be moved must be deleted from the display memory plane (P1 to P8) 6, the display position changed, and drawn again. There is a problem in that it is necessary to repeat the operation and it is difficult to smoothly drag a complicated figure.

The present invention overcomes the above-mentioned conventional drawbacks and provides a function to change the display position address of one or more display memory planes independently of other display memory planes, so that large screens can be bonded together. The purpose of this invention is to provide a method that can easily display or drag complex images.

[Means for solving problems]

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the present invention, in a display device having a plurality of display memory planes, an X address register 2 that can set a display start address and a Y An address register 3 and an X counter 4 which can count up the number of pixels to be displayed in synchronization with the pixel display cycle of the rask scan type display.

A Y counter 5 that can count up in synchronization with the rask period is provided, and the display address can be changed independently of other display memory planes.

[Effect]

That is, according to the present invention, in a display device having a plurality of display memory planes, display start is performed on each of one or more display memory planes independently of other display memory planes. By providing an address register that can set the position and a counter that sequentially counts the nine displayed memory addresses, the display position of the one or more display memory planes can be set differently from other display memory planes. Since it is designed to be set and changed independently, the display position can be changed according to the movement speed even for complex figures by simply setting the display start position (address) as an offset value in the address register. In addition to realizing smooth dragging, the multiple display memory planes can store image information for multiple sides, and by simply changing the offset value, it is possible to paste large shapes together or to switch quickly. By displaying it, it is also possible to obtain animation effects.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

The above-mentioned FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram illustrating a dragging method according to the present invention, and FIG. 3 is a diagram illustrating a large screen display method according to the present invention. This is a diagram for explaining the X address register 2. which indicates the display start position provided for each one or a plurality of display memory planes shown in FIG. Y address register 3.
and an X counter 4 for reading display pixel information. Y counter 5 and related mechanisms are functional blocks necessary to implement the present invention. It should be noted that the same reference numerals refer to the same objects throughout the design.

Even if the present invention is implemented, the display memory plane (P1 to P1
8) Convert the image data above 6 to a conversion table (LOT) 7
The operation of displaying on the screen of a Rusk Scan Display (CRT) according to the color gradation data set in This will be explained with reference to FIGS. 2 and 3 while referring to FIG.

FIG. 2 shows that, according to the present invention, a specific image ■, for example,
This is a diagram schematically showing a dragging method for moving to the right side.

First, a central processing unit (CPU) (not shown) controls the display memory plane (21 to P8) shown in FIG.
6, for example, from the image data stored in P2 to P8, move the image ■ to the moving memory plane (
Pl) and erase it from the plane (1'2 to P8) 6 in which the image data serving as the background is stored.

Next, the display position control unit 1 controls the movement memory plane (PI) 6. and other display memory planes (P2~
In the above address registers (2, 3) of P8), the values shown in Fig. 2 (
After setting the "difference" data (χ1.Yl) between address a indicating the display start position shown in a) and the origin address of the display memory plane (P1 to Pg) as an offset value, the image at this time is Display data (CI?
T), the portion shown in the display area of FIG. 2(a) will be displayed on the display.

Next, the “displacement” data (×2,
Yl) is set as an offset value only in the moving memory plane (PI) 6, and the offset values for the other display memory planes (P2 to P8) 6 are used to perform the display operation.

By performing such a display operation, the image stored in the memory plane (P2 to P8) 6 serving as the background remains stopped, and the image stored in the moving memory plane (PL) 6 (7) becomes a static image.
) - Only the image ■ is displayed as if it had been moved to the right.

In other words, a certain offset value (0°O is also acceptable) is set for the memory plane (P2 to P8) 6 in which the background image is stored, and only the display value is set for the moving memory plane (Pl) 6. By simply setting the display offset value as described above for each refresh cycle, it is possible to realize smooth movement of the image (2).

Of course, for the aforementioned conversion table (LOT) 7,
Prior to the dragging display, it is necessary to set color gradation data at an address position corresponding to the moving memory plane (Pi) 6.

For example, in the moving memory plane (PL) 6, the pixels to be displayed are set to °1" and the others are set to °0", so pixels other than the pixels set to the °l" For the background memory plane (P2 to P
8) Since the image 6 must be displayed, the conversion table (LOT) 7 needs to be displayed transparently.

Therefore, the address of the conversion table (L[IT) 7 °
IXXXXXXXX' contains the color gradation data (for example, "black °") for the moving image ■, and the address °0
By setting blank data for transparent display in XXXXXXX', the above-mentioned dragging image (2) will be displayed in "black" and will move within the background image.

In addition, when the above-mentioned dragging image (■) is to be displayed in two or more colors, for example, a small number of memory planes (two or more memory planes) are used as the moving memory plane (PI) corresponding to the number of colors. ).

Next, a method of displaying on a large screen will be explained with reference to FIG.

In Fig. 3, for convenience of explanation, the display area (° Hachi°
This will be explained using an example of displaying (indicated by ).

In this case, four display memory planes are required. Here, the X direction of each memory plane is i.

° The Y direction is assumed to be j, and the display area (that is, the size of the display screen) is assumed to be l in the X direction and m in the Y direction.

In order to display the 400 pages of the book, the 'displacement' data between the address indicating the display start position for each memory plane (PI-Pi) and the origin address of each memory plane is calculated as plane 1 (Pi). For (x, y), plane 2
(P2) is (X-t+y), plane 3 (P
Set (x, y-j) as the offset value for 3) and (x-t+V-J) for plane 4 (Pi), respectively, and set them for each memory plane (Pi to P4) 6. display operations in synchronization with each other.

On the other hand, in the conversion table (LOT) 7, assuming that the display pixels of each memory plane (Pi to P4) are displayed as 'white' and the non-display pixels are displayed as 'black', there are originally four display memory planes. Since there is only one conversion table (LO
T) 7 is also composed of 24 words, and the following color gradation data must be set at each address position by the central processing unit (CPU) prior to the display operation.

That is, in the area of plane 1 (PL), since there is no corresponding pixel in other planes 2 (P2) to plane 4 (Pi), there is no pixel from plane 2 (P2) to plane 4 (Pi).゛ is output. Therefore, gradation data corresponding to plane 1 (Pi): LOT address "
Set white data for 1ooo'. Similarly, for the gradation data corresponding to plane 2 (P2): LOT address otoo', for the gradation data corresponding to "white" data for plane 3 (P3): LOT address °0010°, ° White” Data Plane 4 (P
Gradation data corresponding to i): LOT address °0001
' Set white data for '. Then, "black data" is set for the IIT address oooo' as gradation data corresponding to positions where there are no display pixels in planes 1 (PL) to 4 (Pi).

When the display operation is started in such an initial state, in plane 1 (Pi), the X counter 4. The Y counter 5 starts counting up and outputs 071 data of each corresponding pixel to the register 61.
Output to.

At this time, as mentioned above, other planes 2 (P2) to 4
Since all output data from (Pi) is 0°,
The LIT addresses corresponding to each pixel of the output data are '1000' and '0000'.

Therefore, the LOT address °1000' or 000
Corresponding to 0°, the conversion table (CUT) 7 is accessed and each pixel is displayed on the display according to the above gradation data.

Here, each X counter 4. The value of Y counter 5 is X+Δ
When X≧i Y+ΔY≧j, it is outside the display area, so plane 1 (Pl)
The output register 61 is controlled so as not to output image data (becomes 'O').

On the other hand, in plane 2 (P2), from the offset value (x-4, y), the X counter 4. Since Y counter 5 starts counting up, X-i+ΔX=
0, it is recognized as being outside the display area, and the plane 2 (1
The output data from the output register 61 in '2) is suppressed. Then, within the range of 0<X-i+ΔX, ΔX≦2, O/1 data of each pixel within the display area of the plane 2 (P2) is output from the output register 61.

At this time, other planes 1 (PL), 3 (P3), 4 (P
Since the output data from 4) is all 0, the LOT address corresponding to each pixel of the output data is “010”.
0°, becomes “0000”.

Therefore, the L [IT address “0100°” or “oo
Corresponding to oo', the conversion table (LOT) 7 is accessed, and each pixel is displayed on the display according to the above gradation data.

Hereafter, in the same way, plane 3 (P3), 4
Also in (P4), only the 0/1 data for the pixels in the display area indicated by the above "hatch" is output, and the above gradation data is set in the conversion table (LυT) 7 corresponding to the output data. By displaying each pixel, the display area covering four sides is displayed on the display.

In such a large screen display method, when a specific image within the display area is moved upward, for example, by the dragging method explained in FIG. PI), 2 (P
2) While moving the upper part, the image data of the upper direction is read from the file memory (not shown), and the image data of plane 3 which is no longer necessary for the dragging display is read out from the file memory (not shown).
), 4 (P4), and when the moving operation in planes 1 (PI) and 2 (P2) is completed, they are stored in planes 3 (P4) and 4 (P4). The above image data in the upper direction is transferred to plane 1 (
It can be seen that it is theoretically possible to simulate an infinitely large screen by replacing Pl) and P2 (P2) and controlling the dragging display to start again.

As described above, in the present invention, in a display device having a plurality of display memory planes, each display start can be performed on one or a plurality of display memory planes independently of other display memory planes. An X, Y address register that can set data indicating a position as an offset value, and an X, Y counter that sequentially reads pixels in the display area from the display start position are provided. The feature is that it allows for dragging display or pasting display on a large screen.

〔Effect of the invention〕

As described above in detail, in a display device having a plurality of display memory planes, each of one or more display memory planes has another display memory. By providing an address register that can set the display start position and a counter that sequentially counts the memory addresses displayed one by one, independently of the plane, the display position of the one or more display memory planes can be set. Independently from other display memory planes,
Since it is designed to be set and changed, simply by setting the display start position (address) as an offset value in the address register, even complex figures can be smoothly displayed by changing the display position according to the movement speed. In addition to realizing dragging, it is also possible to store image information for multiple sides in the multiple display memory planes and paste large figures together by simply changing the offset value.
By switching and displaying at high speed, it is also possible to obtain animation effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a diagram explaining the dragging method according to the present invention. FIG. 3 is a diagram illustrating a large screen display method according to the present invention. FIG. 4 is a diagram schematically showing the display function of a conventional display device. FIG. 5 is a diagram illustrating the correspondence between display memory brains and areas displayed on an actual display screen. FIG. 6 is a diagram showing a configuration example of a two-dimensional arrangement of display memory brains. It is. In the drawings, 1 is a display position control unit. 2 is the X address register (■). 3 is the Y address register. 4 is the X counter (II, L), 5 is the Y counter. 6 is a display memory brain (PL-7-P8). 61 is an output register, and 62 is a selector (SEL). 7 is a conversion table (LOT), 8 is a D/A converter (
DAC). II is ■1 part L is L part. are shown respectively. , Δku, 4 days PIIs depend on ζ, b clause name, hand, first, 1 injunction? , Akira 4 Roin × Main page for the front page 2-dimensional Shirakami village rebellion stop “1 thick 1”: Miman 6 +]

Claims (1)

[Claims] A display device having a plurality of display memory planes (6), wherein the display position of one or more of the display memory planes (6) is set to another display memory plane. 1. A display device comprising: means (2, 3) for setting independently from the set position; and means (4, 5) for counting memory addresses to be displayed from the set position.