JPS59162588A - 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 The present invention allows output from an electronic computer to be
(Cathode ray tube) That is, it relates to a display that displays characters, images, graphs, etc. on the display screen of a cathode ray tube, that is, a display device.

FIG. 1 is a block diagram showing a conventional display device of this type.
1) is, for example, a bitmap memory section that holds a plurality of rectangular image patterns; (2) is the position of each of the above-mentioned rectangular image patterns in the bitmap memory section (1);
and a display control section that holds as display control information the size, display priority for superimposed display, and the position on the screen memory section (3) to which each rectangular image pattern is to be transferred, (3) is a cathode ray A screen memory section (4) stores image patterns corresponding to the dots on the display screen of the tube (6), and (4) stores the bitmap memory section (1) in accordance with instructions from the display control section (2).
The rectangular image pattern in the above screen memory section (
(3) is a direct memory access controller unit that transfers data to a specific location; (5) is a video control unit that generates a video signal from the display pattern read out from the screen memory unit (3) according to a specific timing.

Next, FIG. 2 is an explanatory diagram showing a state in which, for example, three rectangular image numbers (turn (IF) (IP, ) and (IPI)) are held in the bitmap memory section (1). Each square image pattern IPi (i=1
Bitmap memory section (1) at the top left corner of ゜2.3)
The position is expressed as (Xl, yi), and this is the position of the square image turn (IPi) in the internal pressure of the bitmap memory section (1). In addition, the size in the X direction of the superior biliary quadrangle image pattern IPi (1=1.2.3) is expressed as (hi), and the size in the y direction is expressed as (vi
), and using these to create a rectangular image pattern IP
The size of i is expressed as (ht, vi). Furthermore, in the case of superimposed display, the display priority representing the vertical relationship of each rectangular image pattern IPI is PR, l
It is said that That is, when PR,i < PR,j, each rectangular image pattern IPI is displayed below IPJ, and as a result, a part of each rectangular image pattern IPi is covered and hidden by IPj. It is composed of In addition, if l~j, PRl”rPR
, j.

Next, FIG. 3 shows that the rectangular image patterns (IPI) (IF goose) and (IPs) explained in FIG.
I<PR,.

As a result of transferring the above-mentioned rectangular image patterns (IPs) (IP@) and (IF,) to a specific position in the screen memory section (3), when the display priority is
In the explanatory drawing showing the state of the screen memory section (51) that can be obtained, the position of the top left corner vertex of each rectangular image pattern IPi in the screen memory section (3) is expressed as (α
i, β1), and this is taken as the position of the rectangular image pattern IPi in the screen memory section (3).

Next, FIG. 4 shows steps 1 to generate the state of the screen memory section (6) shown in FIG. 6 above from the state of the bitmap memory section (1) shown in FIG. 2 above. It is a drawing specifically displaying display control information held by the display control unit (2).

Next, the bitmap memory section (
From the state ρ) of 1), the screen memory section (
6) A display control unit (2J) for generating the state.

and direct memory access controller section (4)
Explain the operation.

That is, the display control unit (21) checks the display priorities PH1, PR, .

From then on, the direct memory access controller section (4) is sequentially instructed to transfer data from the bitmap memory section (1) to the screen memory section (6).In this case, Pl<P, <P. , so first, among the display control information regarding the rectangular image pattern (IP, ), the position (Xle)'1 )j(hl *V1
) and (αλ, β1) to the direct memory access controller unit
After the transfer of this rectangular image pattern (IPl) is completed, the 1 display control unit (2) transfers the rectangular image pattern (IPI) to the position (α1.βl) in the screen memory unit (3). Display side (to) information regarding ((xz-)'5)s(busVs)e(α*-A))
is applied to the direct memory access controller section (4), the rectangular image pattern (IP, ) in the bitmap memory section (1) is transferred to the screen memory section (
6) is configured to be transferred to the position (α mushroom, β2).

As mentioned above, when the square image pattern (W,) is transferred in the screen memory section (3) to a position where it overlaps with the square image pattern (IP,) which has already been transferred, Regarding the image pattern of the overlapping part.

The image pattern of the newly transferred rectangular image pattern (IPI) is given priority, and the rectangular image pattern (IPt) that already exists in that part is replaced with that of the new rectangular image pattern (IP, ). . In other words, for overlapping parts, there is a reason why the image pattern that is newly transferred is always given priority. After the transfer of the rectangular image pattern (IP, ) is completed in this way, the 1 display control unit (2) is configured to perform the same operation as described above for the next rectangular image pattern (IP, )tc. As a result of the above-described operation, the state of the screen memory section (5) as shown in FIG. 3 is generated, and three overlapping rectangular image patterns are displayed on the display screen of the cathode ray tube (6). That's why.

Next, as an example of changing the display screen of the cathode ray tube (6), the operation of the display control unit (2) when erasing a rectangular image pattern (IPs) in the screen memory unit (3) shown in FIG. 6 above will be explained. .

In other words, Fig. 5 is a rectangular image pattern (IP depth).
” is a drawing showing the state of the screen memory section (3) obtained as a result of erasing the rectangular image pattern (I
Ps) When V is erased, 1 display control unit (21 is the other rectangular image pattern (IPI) that is covered by the above-mentioned rectangular image pattern (IPm) and does not appear on the display screen of the cathode ray tube (6) in FIG. 3). The screen memory section (3) shown in FIG.

In the conventional display device of this kind, as mentioned above, when erasing one of the rectangular image patterns (IP), the first display control section (2) first erases all the contents of the screen memory section (3). The display control unit (2) then deletes the display control information it owns that relates to the rectangular image pattern (IP, ) and newly creates another rectangular image pattern (IP).
t), and (iP,) are retained.

FIG. 6 is a diagram specifically displaying the display control information newly held in this way, and shows the display-control unit (2J
The above-mentioned case is achieved by transferring the rectangular image patterns (IP+) (I) from the bitmap memory section (1) to predetermined positions in the screen memory section (3), respectively, according to the same means as in the above-mentioned case. The state of the screen memory section (3; shown in Figure 5) is obtained, and the erasure of the rectangular image pattern (ip, > is completed.
), the other image pattern (IP
), and a rectangular image pattern (IP
m) is constructed in such a way that it is not affected in any way by the erasure of the rectangular image pattern (IP, ).

In addition, when erasing the rectangular image pattern (IP) in the conventional display device described above, after erasing the contents of the screen memory section (31), the rectangular image pattern (IPI) and (IP,) are newly stored in the bitmap memory. As a result, a rectangular image pattern (IP, ) is transferred from part (1) to screen memory part (3).
The rectangular image pattern in the area unaffected by the erasure is also transferred again from the bitmap memory section (1) to the screen memory section (3).

As described above, according to this conventional I display device, when changing the display screen of the cathode ray tube (61), even the rectangular image pattern in the area that does not need to be changed is stored in the first memory section, that is, the bit map. Since the data is transferred from the memory section (η) to the second memory section, that is, the screen memory section (3), there is a drawback that the change of the display screen of the cathode ray tube (6) is significantly delayed.

This invention has been made with attention to this point, and when changing the display screen of a cathode ray tube (<6), the display control unit (2)
) held by "Display side (2) information" and "Takasarahebetsu"
The area in the screen memory section (3) that needs to be changed is determined by It is an object of the present invention to provide a display device that can change the display screen at extremely high speed.

That is, although FIG. 7 shows one embodiment of the present invention, the same reference numerals as those in the above-mentioned conventional device (FIG. 1) refer to the same constituent members, and the explanation thereof will be omitted.

(7) is inserted between the display control section (2) and the direct memory access controller section (4), and is a second memory section that needs to be changed, that is, the screen memory section (
6) is an area discriminator that discriminates the partial area within. After receiving the "display control information" and 1-change type from the 1 display control section, this region discriminator (7) first reads this section. The area discriminator (7) is configured to determine the change range in the screen memory section (5) to be processed by the area discriminator (7). Calculate the coordinates of the four vertices of the turn, and use this to divide the block memory section (6) into 11 small rectangular areas that do not overlap with each other.
Furthermore, this area determination unit (power) determines which of the above-mentioned small rectangular areas should be changed in order to change the display screen of the cathode ray tube (6), and determines which of the small rectangular areas to be changed.
Direct memory access controller unit (4) is connected from bitmap memory unit (4) to screen memory unit (3).
) is configured to instruct image pattern transfer to 0.

FIG. 8 is a flowchart for explaining the operation of the area discriminator (force) described above, and shows the screen shown in FIG. 3 above.
In the state of the memory unit (3), the area discriminator unit (shows the force operation) when the rectangular image pattern (IP*) is erased.

That is, in step (8) in FIG.
The area determination unit (1) receives "display control information" and "change type" from the display control unit (2) and determines the above-mentioned change range. In this case, the rectangular image Since the pattern (Ih) is deleted, the change range is determined by the points (A, B) that satisfy α24A × α2+h2 β, , <8<β, 10v2.

Next, in step (9) in FIG. 8, the coordinates of the four vertices of each rectangular image pattern in the screen memory section (3) are calculated from the display control information, thereby making the screen memory section (6) overlap each other. In this case, the area determination unit (7) retains the position and size of each of the small rectangular areas in the screen memory unit (3). It is done like this.

Furthermore, this area discrimination section (7) is connected to the screen memory section (
Regarding the coordinates of the four vertices of each rectangular image pattern in 6), first, only the respective α coordinates and values are determined, and the same α
If there are two or more coordinate values, only one of them is determined and the others are ignored.

As described above, the area discriminator (7) Using these m α coordinate values and n β coordinate values, screen memo 1] part (6) is (m+1) x (1+1
) into non-overlapping (・small rectangular areas,
These screen memo I) positions and sizes within section (3) are maintained.

ing.

And 11 copies of the above screen memo (inside 3j,
In the α-axis direction, the kth (k=1.2...m+1
), and then the second in the β-axis direction (/, -1, 2,...
...n+1), the above-mentioned small rectangular area rsPjJ
The positions in the screen memory section (3) are rpj, qjJ, and the sizes are rrj, 1ljJ.
shall be. However, the above j=(1-1) (yyz+1
)+.

Next, FIG. 9 shows each rectangular image turn (I) in the state of the screen memory unit (6) shown in FIG.
1 indicating the coordinates of the four vertices of P,, IP, and IP,)
10 is in the above-mentioned state (S
This drawing shows a state in which the area discriminating unit (7) divides the screen memory unit +31 into small rectangular areas according to the above procedure.
3) is divided into 49 small rectangular areas, and this first
In Figure 0, I''sPJ indicates a small rectangular area located fifth in the α-axis direction and sixth in the β-axis direction, and its position and size are as follows.

(P2Om q weak) = (α1.β*+V*>(r4os
8m)=(α鵞+h*−α3.β+Vm/l Vz)
Next, step (10) in chart 70 of m8 diagram
, the area discriminator (7) determines the display priority (PRl,
) from the display control information and separately retaining the area determination unit (7) according to the present invention, which deletes the information regarding the rectangular image pattern from the display control information and uses the result as new display control information. It is designed to be held in place.

Next, step (11) in the 70-chart in Figure 8.
In step (12), the control variable j is set to 4 as an initial condition, and the control variable j+1 is set to j in step (12). Further, in step (16), it is determined whether or not the small rectangular area rsI)jJ is included in the variable range determined in step (8), and if it is included, the next step ( There is a button to proceed to step (14), and if it is not included, proceed to step (19), and such determination work is performed, for example, in the following manner.

α mushroom≦kenj, and pj+rj≦q! +l1m5 and 1g
When 4QJ and qj+sj4birds+V, 1, the small rectangular area rspjJ is included in the change range, and in other cases, it is configured not to be included.

Next, step (14) in the 70-chart of FIG.
), among the rectangular image patterns (IPl) in the screen memory section (6), a rectangular image pattern that includes the small rectangular area USpiJ and has the highest display priority is determined, and this is determined as a rectangular image pattern (IPa).
), and further, in the new display control information held in step (10) above, the positions and sizes of the rectangular image patterns having the highest display priority are taken out in order, according to the following conditions.

It is determined whether the rectangular image pattern includes the small rectangular area (5)J.

That is, αl pj, and pj + rj α amount + hi, and β14
When qj and qj+sj4βt+vi, the rectangular image pattern (IPi) includes the small rectangular area rspjJ, and does not include it at other times.

The rectangular image pattern (IPi) initially determined to include the small rectangular region r8pJJ is assumed to be (IPa), but the small rectangular region rspjJ may not be included in any of the rectangular image patterns. Sometimes, the area discriminator (7) is configured to hold information that "the rectangular image pattern (IPa) could not be determined." And the above step (10)
The new display control information obtained in includes information regarding other rectangular image patterns (IP, ) and (IPs), so the small rectangular area rspjJ is
When included in both IP,) and (IP,), P
By R5m > PRll, IPa=I
Therefore, it is determined that Ps.

Next, step (15) in the flowchart of m8 diagram.
), the result of step (14) is checked, and if the rectangular image pattern (IPa) has been determined, proceed to step (17), and if it has not been determined, proceed to step (16). being done.

Furthermore, in step (16), the small rectangular area rs
Since there is no rectangular image pattern that includes pjJ, the area determination unit (direct memory access controller unit (4) uses the image pattern of small rectangular area (g) piJ as a background image pattern (an image that does not display any pattern), and then proceed to step (19).

Next, step (17) in the 70-chart in Figure 8.
, the display priority of the rectangular image pattern (IPa) is 1''PllaJ, and the display priority of the rectangular image pattern that is separately held in steps (10) and to be processed is 1'1)Rbl. If PR,a>PR,b, then the small rectangular area r
Determine whether spl change is necessary or necessary, and proceed to step (19)
It is designed to move forward. However, on the contrary, PRa
If <PR,b, it is determined that the small rectangular area [5pjJ needs to be changed, and the process proceeds to step (18). In addition, since the notification priority 1"PR,bJ does not exist in the new display restriction information obtained in step (10) above, it is impossible for PR,a = PR,b. Furthermore, in the case of the above-mentioned embodiment, PRb=PR1* # PRa-PR1, or PR3
And, since PRll < PR4 < PRs, when PR5L=PR,l, the small rectangular area r8p
It was determined that the change in jJ was unnecessary.

When PR,a=PR1s, the small rectangular area r8pjJ
Therefore, it is determined that a change is necessary.

Next, step (18) in the flowchart of FIG.
), the rectangular area of the bitmap memory unit (1) corresponding to the small rectangular area rspjJ is determined as follows, and the image pattern of the above rectangular area is converted into the small rectangular area r8p.
The direct memory access controller unit (4) is instructed to transfer the data to jJ.

Next, FIG. 11 shows the small rectangular area rspjJ, the rectangular image pattern (IPa), and the small rectangular area rsI)jJ
(20) in FIG.
71 is the bitmap memory section (rectangular area section on η) corresponding to the small rectangular area rspjJ. From the positional relationship shown in FIG. 1) The position of the rectangular area above is determined to be (pj-αa+x&*qj-β51+ya), the size is determined to be (rj, sj), and these are instructed to the direct memory access controller unit (4). In one embodiment described above, IPa=ip1. or IP wealth.

Next, %70 in Figure 8 - Step (19) in the chart
), check whether all small rectangular areas rspjJ have been processed or not, and if (jl is (m+1
)x(m+1) is reached, and j
"r8pj at the end of r (m+1)X(n+1)
To proceed to October, proceed to step (12).
The process is terminated when =(''+1)X(n+1), and in the above-mentioned embodiment, (7
7! +1)X(n+1)-49.

Next, FIG. 12 shows the area of the screen memory section (3) that is changed by the display device of the present invention when the rectangular image pattern (IP, ) is erased in the state of the screen memory section shown in FIG. In the explanatory drawing shown, this f
In Figure 412, the shaded area (21) is the area to be changed.

As described above, according to the display device of the present invention, when changing the display screen of the cathode ray tube (6), only the minimum necessary portion in the screen memory section (6) is changed. The amount of image pattern data transferred from the bitmap memory section (1) to the screen memory section (3J) to change the display screen is significantly reduced, making it possible to change the display screen extremely quickly. It is effective.

[Brief explanation of the drawing]

Figures 1 to 6 show a conventional display device of this kind. Figure 1 is a block diagram of the display device, and Figure 2 shows a third rectangular image pattern held in the bitmap memory section. An explanatory diagram showing the state. FIG. 6 is an explanatory diagram showing a state in which three rectangular image patterns are held in the screen memory section, FIG. 4 is an explanatory diagram specifically expressing the display side 8 information held in the display control section, FIG. 5 is an explanatory diagram of the screen memory section after one of the six rectangular image patterns has been erased, and FIG. 6 is an explanatory diagram specifically expressing the display side (to) information. 7 to Mg12 all show an embodiment of the present invention. FIG. 7 is a block diagram, FIG. 8 is a flowchart of the area discriminating section according to the present invention, and FIG. FIG. 913 is an explanatory diagram showing the state of the screen memory section divided by the area discriminator, and FIG. 11 is the positional relationship between the rectangular regions in the bitmap memory section and the screen memory section. FIG. 12 is an explanatory diagram showing the changed area of the screen memory section. In the drawings, (1) is a bitmap memory section, (21 is an inter-display section, (3) is a screen memory section, (4) is a direct memory access controller section, (51 is a video control section, and (6) is a In the cathode ray tube, (7) is an area discriminator.The same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - 1st mouth 2nd drawing P2 Fig. 3 P3 Fig. 4 Fig. 5 Be P2 Figure 6 Figure 7 Figure 8 Figure 11 SPJ Figure 12/IP+

Claims (4)

[Claims] (1) A first memory section that holds a plurality of rectangular image patterns; a second memory section that stores image patterns corresponding to the display screen of the cathode ray tube; a direct memory access controller section inserted between the direct memory access controller section and configured to transfer a predetermined rectangular image pattern in the first memory section to a predetermined position in the second memory section; The direct memory access controller includes a display control section that holds display control information and a video control section that generates a video signal from a display pattern read from the second memory section according to a specific timing. and the display control section, the display control information held by this display control section and the area in the second memory section that needs to be changed depending on the type of change are determined, and the first memory is used only for that area. 1. A display device comprising an area discriminating section that transfers a rectangular image pattern from the display section. (2) It! 2. The display device according to claim 1, wherein a bitmap memory section is used as the first memory section. (3) The display device according to claim 1, wherein a screen memory section is used as the second memory section. (4) The area determination unit determines a rectangular area in the second memory unit that should be changed for one display change and a rectangular area in the first memory unit that corresponds to this rectangular area from the display control information and the change type. Claim 1, characterized in that the direct memory access controller is configured to instruct the direct memory access controller to transfer the rectangular image pattern from the rectangular area in the first memory unit to the rectangular area in the second memory unit. The display device according to item 1.