JPH0661037B2 - Image display system - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention is used for an image display system having a relatively large capacity image memory and obtaining desired information by scrolling a window set on the image memory. The present invention relates to a scroll control method for a suitable display screen.

[Technical background of the invention and its problems]

In an image display system having an image memory with a comparatively large capacity, it is general to display only a part of the displayable object due to the restriction of the display screen capacity. That is, the size of the displayable target area is larger than the normal display screen capacity. In recent years, multi-windows, which divide the display screen and use each as an independent window, have become popular.

By the way, conventionally, there are various methods of locating a displayable object to a place to be actually displayed, and “scrolling” shown below is one example. Scroll refers to conversion of the corresponding positional relationship between the displayable target area and the window.
Here, the displayable object means a portion stored in the image memory as one screen, and the window means a portion visible on the display screen. Therefore, the installation position of the window on the display screen may be changed, or an arbitrary portion of the displayable object may be associated with the window to change the position.

Use the window function above to scroll and display the desired location. This naturally obscures the contents displayed immediately before, but in the case of figures, it may be inconvenient when inputting using the display screen. This will be described with reference to the drawings. Now, assume that the user wants to input the graphic information shown in FIG. 1 (a). As shown, the left and right circles have the same height. If the size of the window is not large enough to represent the left and right sides of the figure at once, first draw from the circle shown on the left as shown in FIG. 1 (b). (It may be on the right side first) This can be drawn by giving the center point and radius as parameters, as is well known in the art. Next, in order to draw the figure on the right side, right scrolling is performed as shown in FIG. 1 (c). The problem here is that the left circle disappears from the display screen due to the scrolling, and accordingly the position of the circle to be drawn cannot be known.

As described above, when the display screen is diversified and subdivided by the multi-window, higher density of display information and ease of use are increasingly required. Therefore, the existence of the above-mentioned drawbacks is not allowed when pursuing operability.

[Object of the Invention]

The present invention has been made based on the above circumstances.
As shown in Figure (d), the scrolling process is performed on the contents of the hidden part (one-dimensionalization of the two-dimensional information) and reflected on one side of the window so that the position of the hidden part can be estimated. It is therefore an object of the present invention to provide a scroll control method for a display screen with improved operability.

[Summary of the Invention] As described above, the gist of the present invention is to convert two-dimensional address information of a portion hidden by scrolling into one-dimensional address information through a gate, and to convert this into one-dimensional address information on one side of a corresponding outer frame of a window. As described above, it is possible to infer the position of the part that cannot be seen by reflecting it on the. Therefore, in addition to the conventional components of this type of display system, means for further sequentially comparing the contents of the scroll register and the contents of the window register and updating the data of the display register according to the scroll direction indicated by the flag register, A logical product output of the flag register output and the respective values set in the window register, and a comparison circuit for detecting a comparison match between the address information sequentially updated and output in synchronization with the display raster and the logical product output of the flag register, , When the comparison match by the comparison circuit is detected, the two-dimensional pixel information in the range that disappears from the window due to the scrolling of the window is converted into one-dimensional pixel information, and this is set to one side of the corresponding outer frame of the window. A display register and a gate circuit are added.

By this, the position of the hidden part can be estimated, and the operability is improved. The present invention is symmetrical left and right, up and down,
Moreover, it is particularly effective when drawing large graphic information.

Example of Invention

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a diagram showing the scroll operation on the display screen.
(a) scrolls left, (b) scrolls right,
(c) shows an upward scroll and (d) shows a downward scroll. As shown, an image memory (V
This is called because the location corresponding to the window on RAM) is moved in each direction. The part hidden by scrolling is a new window
Since it is located at (a) right, (b) left, (c) bottom, and (a), the contents of the present invention are reflected on the right, left, bottom, and top of the outer frame, respectively. As described above, according to the present invention, the contents of the portion hidden by scrolling are reflected on one side of the outer frame of the window by performing a certain process so that the portion which cannot be seen can be estimated. In the figure, VRAM indicates a displayable target area, a rectangular frame indicates a window, and a graphic in the window indicates display data.

FIGS. 3 (a), (b), (c), and (d) are diagrams showing changes in the scroll register and the window register before and after scrolling in left, right, up, and down scrolls, respectively. In the figure, X _RQ is a scroll register in which horizontal (X) position information of the scroll destination is set and stored, Y _RQ is a scroll register in which vertical position (Y) position information of the scroll destination is set and stored, and X _s is The position of the left side of the window, Y _s is the upper side, X _e is the right side, and Y _e is a register in which position information of the lower side is set and stored.

FIG. 4 is an operation conceptual diagram showing the operation principle of the present invention on a display screen. As described above, by scrolling, a new window can be created and at the same time, a hidden part can be created. Therefore, the pixel information (two-dimensional) in the range moved by scrolling (hatched portion) is converted into one-dimensional information and set to the corresponding one side.

As the conversion from the two-dimensional to the one-dimensional, it is possible to take a logical sum (OR) of each pixel in the scroll direction. In the figure, the arrow indicates the scroll direction, and the portion indicated by EX indicates a part of the window outer frame. As a result of the OR condition being reflected on the outer frame, the part turned ON acts to erase the outer frame. The outer frame is always present.

FIG. 5 is a diagram showing the flow of operations and actions. First, the cursor is freely moved, and when the position is determined, the key operation to that effect is performed. Scroll register X _RQ , Y at that time
The value of _RQ indicates the scroll destination. After that, the setting operation of the display register (DS _REG ) described later is started, and the window registers X _s , X _e , X _s , and Y _e are updated. The screen display is always performed, and the window register X _s ,
The results of X _e , X _s , Y _e and the display register DS _REG are immediately reflected on the screen.

FIG. 6 is a hardware block diagram showing only the display register (DS _REG ) set operation part in the display system in which the present invention is realized. In the figure, 61
Is an image memory (V _RAM ) in which the display contents of the displayable area are stored in a bit map form. In the embodiment of the present invention, the size is 1024 bits in both the vertical and horizontal directions. 6
_{Reference numeral} 2 is a display register (DS _REG ). Display register 62
Has a ring shape as a whole (1024 bits), and is rotated leftward by one bit when one shift pulse is supplied. Also, in the figure, there is a set terminal at the 2 ° bit indicated by the shaded area, and it is set when the bit is ON, but the set state does not change when the bit is OFF. Display register 62
In, the information of the portion hidden by scrolling is one-dimensionalized and stored.

Reference numerals 63 and 64 denote scroll registers (X _RQ , Y _RQ ) which are 10-bit registers for setting and storing position information in the X direction and the Y direction of the scroll destination, respectively. The outputs of the registers 63 and 64 are connected to the image memory 61 and the logical operation circuit 70 (hereinafter, simply
(Referred to as ALU) is supplied to one input terminal. 65,
Reference numerals 66, 67, 68 denote window registers, which are the left side position (X _s ), right side position (X _e ), and window position respectively.
The upper side position (Y _s ) and the lower side position (Y _e ) are set and stored.
The outputs of these window registers 65 to 68 are supplied to the other input terminal of the ALU 70 via the gate. ALU70
Performs 10-bit binary addition / subtraction and comparison operation. The operation result here is supplied to the work register (WR69) via the gate.

Reference numeral 71 denotes a flag register, which sets the scroll direction of left, right, up, and down. Reference numeral 72 denotes a control circuit () for setting data in the flag register 71 and various registers 63 to 69 based on an external instruction, processing the display data by the ALU 70, and controlling opening / closing of many AND date groups in the figure. Control It also controls the timing of updating and displaying data in the display register 62.

FIG. 7 is a flow chart showing the setting operation for the display register 62, which is composed of two subroutines.
The main routine is shown in (a), and the detailed procedure of each subroutine is shown in (b) and (c).

Here, regarding the setting operation to the display register 62,
This will be described in detail with reference to FIGS. 7 (a), (b) and (c). First,
By operating the cursor, scroll registers 63, 64
The contents of (X _RQ , Y _RQ ) are updated, and the scroll position determination signal (S DEC) is sent to the control circuit 72 by a predetermined key operation.
Come to. The control circuit 72 is activated by this signal,
First, the scroll register 63 (X _RQ ) and the window register 6 are used to determine whether or not scrolling is designated in the horizontal direction.
5 (X _s ) for comparison. This content comparison is A
Performed by LU70. When the comparison match is detected by the ALU 70, the scroll direction (left and right) of the control circuit 72 is obtained, the flag register 71 is referred to, and the work register 69
Using the scroll register 65 (X _s ), 66
(X _e ) and the display register 62 (DS _REG ) are updated. Data update of the display register 62 (DS _REG ) is
This is performed by extracting 1-bit data from the image memory 61 and adding an OR condition to the 20-bit portion.
Next, the scroll register 64 (Y _REG ) determines whether or not the vertical scroll is designated by the window register 6
Check by comparison with 7 (Y _s ). When it is confirmed that this is the case, the scroll direction is obtained, the work register 69 is used, and the scroll registers 63, 64 (X _RQ ,
Y _RQ ) contents and display register 62 (DS _REG ) data is updated.

FIG. 8 is a hardware block diagram showing an extracted portion for controlling screen display. In the figure, the blocks having the same numbers as the blocks shown in FIG. 6 are the same as those in FIG. 6, and therefore the description thereof is omitted here to avoid duplication. In the figure, 81 to 85 are OR gates. The OR gate 81 is supplied with the outputs of the window registers 65 to 68 and the four outputs of the AND condition with the respective bits of the flag register 71 indicating the scroll direction.
A horizontal address signal (HADR) output in synchronization with the display raster is sent to the OR gate 82, which will be described later.
An output obtained by performing a logical product with the output of 3 and an output obtained by performing a logical product of the vertical address signal (V ADR) by the output of an OR gate 84 described later are supplied. The above-mentioned OR gate 83 is supplied with the left and right bits of the flag register 71 in which the scroll direction is set, and the OR gate 84 is supplied with the upper and lower bits. Further, the OR gate 85 is supplied with horizontal and vertical timing pulses (H TP / U TP) from the outside to give the timing pulse to the display register 62.

The outputs of the OR gates 81 and 82 are supplied to the comparison circuit 86, where the comparison and coincidence are checked, and the output which is ANDed with the display register 62 is supplied to the inverter gate 87.

At the left end of the drawing, it is shown that the horizontal timing pulse / vertical timing pulse (H TP / V TP) and horizontal address / vertical address (H ADR / V ADR) are supplied from the outside. It is sequentially output in synchronization with the display raster, which depends on the performance of the display monitor 88.
It is supplied from a timing control unit (not shown). Since it is an essential control signal for display and is well known in the art, only the signal name is described here.

The operation of the display portion will be described with reference to FIG. For example, when the leftward scroll is designated, the comparison circuit 86 causes the horizontal address signal (HADR) coming from the outside to indicate the right side of the window in the window register 66.
When it is confirmed that the value is equal to the value of (X _e ), the contents of the 2nd bit of the display register 62 are sent to the display monitor 88 via the inverter gate 87. The display register 62 is rotated by the vertical timing pulse (V TP) so that the horizontal / vertical relations depending on the display monitor 88 can be synchronized. In the embodiment of the present invention, since the 1-bit signal output from the display register 62 is inverted by the inverter gate 87 and the logical product is obtained with the output of the image memory 61, the right side of the outer frame of the window disappears. .

For right scrolling, the left side of the window (X _s )
The above operation is the same as above. Further, with respect to the upward scroll and the downward scroll, the lower side (Y _e ) and the upper side (Y _s ) of the window are targeted, and the same operation as described above is performed by exchanging the description of horizontal and vertical. Further, as one method for stopping the function realized by the present invention, a switch 89 may be inserted as shown in the drawing to lead the signal supply to the inverter gate 87 to the ground. With this, the screen display can be realized as usual.

〔The invention's effect〕

As described above, the hidden portion can be estimated by processing the hidden portion by scrolling according to the above-described procedure and reflecting it on one side of the window outer frame. This feature
In a multi-window state, it is particularly effective when drawing a figure that is symmetrical left and right or up and down and is larger than the size of the window. Further, the range in which the two-dimensional information is made one-dimensional is determined by the scroll direction and the amount each time, and can be set freely. Even if the present invention is carried out, the processing speed does not decrease because no update operation is required for the image memory.

[Brief description of drawings]

1 (a), (b), (c), and (d) are diagrams showing the input procedure for drawing a figure on the display screen, and FIGS. 2 (a), (b), (c), (d) is a diagram showing the explanation of left, right, up, and down scrolling on the display screen, respectively. Fig. 3 (a), (b), (c), and (d) are left and right, respectively. FIG. 4 is a diagram showing changes in a scroll register and a window register before and after scrolling in upward and downward scrolling, FIG. 4 is an operation conceptual diagram showing an operation principle of the present invention on a display screen, and FIG. FIG. 6 is a hardware block diagram showing only the operation part of the display register set in the display system in which the present invention is realized, and FIGS. 7 (a) and 7 (b) are shown. , (C) are flow charts showing the setting operation for the display register, which are the main routine, the subroutine 1, and
FIG. 8 is a hardware block diagram showing the operation flow of the subroutine 2 by extracting the portion for controlling the screen display. 61 ... Image memory (V RAM), 62 ... Display register (DS _REG ), 63, 64 ... Scroll register (X
_RQ , Y _RQ ), 65, 66, 67, 68 ... Window register (X _s , X _e , Y _s , Y _e ), 69 ... Work register (WR), 70 ... Logical operation circuit (ALU) , 71 ... Flag register (FR), 72 ... Control circuit (CC), 81-
85 …… OR gate, 86 …… Comparison circuit, 88 …… CRT
Display monitor.

Claims (1)

[Claims] 1. A window is set on an image memory, a portion of the image information developed in the image memory is displayed in a display area corresponding to the window, and the image information is displayed in accordance with scrolling of the window left, right, up and down. In the image display system for changing the display portion of, the flag register means for setting flag information according to the left, right, up, and down scroll directions of the window, and left, right, up, and down defining the frame of the window according to the scroll of the window. Window register means for setting side frame position information; and the flag register when the window at a position displaying a predetermined portion of the image information developed in the image memory is scrolled in the left-right direction or the up-down direction. Means for setting the flag information and the window register means for setting. The portion of the image information corresponding to the scroll position of the window is displayed based on the frame position information that has been set, and when the scroll direction of the window is the left-right direction, the left and right sides that form the frame of the window are displayed. Among the sides, a part of the side opposite to the scroll direction is changed to a predetermined display form and displayed so as to infer the existence of the predetermined portion which is the non-displayed portion in the reverse direction, or When the scrolling direction of the window is the up-down direction, a part of the side opposite to the scrolling direction in each of the upper and lower sides forming the frame of the window is changed to a predetermined display form to move in the reverse direction. An image display system comprising: a control unit that displays so as to infer the presence of the predetermined portion that is a non-display portion.