JPS59214083A - Display - 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 [Technical Field of the Invention] The present invention relates to a display device for displaying images, characters, figures, etc.

[Technical background of the invention and its problems]

Conventionally, various display devices that display all characters, figures, etc. have been considered.

These display devices also include means for displaying an indicator called a cursor for indicating which location should be edited, or where to rewrite, add, etc.
It is normal to have a llif, and there are various ways to do it, and there are various shapes depending on the purpose. The second drawing shows the configuration of a general character display device, in which the display screen of a CRT (11) is divided into a plurality of predetermined sections.The code memory (2) stores the character pattern to be displayed in each section. Contains character codes and attributes that specify .

Figure 1 shows the codes that specify the character pattern to be displayed in one section, including character codes (6) and 7 triviate (
7). Attributes (η is a cursor for specifying all attributes (71), inversion (72)
, vertical Kei wire (7g), and others (7,).

Timing logic (3) retrieves the character code of each section from the CRT (code memo January January 2, along the scanning order of 11). The character generator (4) outputs character pattern data corresponding to this character code and supplies it to the CRT fl) via the attribute logic (5). On the other hand, the attributes retrieved at the same time are
At the same time as the character pattern data, the Tribute Lothic (
5). For example, if the cursor (71) is 11", the cursor is displayed overlapping the character pattern.

However, this method has the drawback that the position of the cursor that can be displayed on the screen is fixed for each character section, and its shape is also fixed due to the attribute logic (7) shown in Figure 2. .

In order to improve this, a one-picture display with the configuration shown in FIG. 3 was devised. This 21. is code memo January 2
) Image memo corresponding to the C-RT display screen! J
(12) The cursor memo for displaying the new VC cursor key (January 8) and the readout control unit (9) should be fully dedicated to the cursor, and should be placed vertically ((ω and display timing). Only when (11) is negative, the entire contents of cursor memory (8) are read out and the image (home memory (12)
This is a method of displaying the video in combination with the previous video. According to this method, it is possible to display all cursors of arbitrary shapes at arbitrary positions. However, this method requires the same or more hardware to display a full image and only the full cursor, and the maximum size of the cursor is limited by the size of the memo. It had the disadvantage of being accepted.

Therefore, as a method of displaying the cursor more easily without using the dedicated cursor, there is a method of storing the cursor in the image memory. This is an exclusive logic phase (EXOR) twice with the same button.
It takes full advantage of the property that the original VC returns when the voltage is removed, and is expressed by the following equation.

A-AeXf"[')
You can move the cursor to the desired position. For example, as shown in Figure 4, all cursor presses are registered at point C, and in order to move from point A to point B, move from C to A and B.
All KEXOR operations can be transferred anywhere. The transfer may be performed either optically or simultaneously.

Furthermore, a method of displaying the cursor gxogil without changing it is also conceivable. Figure 5 shows an example of this, in which the cursor of A is transferred to the button 'kD' before it is displayed ((■). Next, the cursor is displayed on A. The cursor is moved from A to B. To move the meeting, first transfer from D to A■),
Return to the original state and transfer the contents of B to D, then C
This can be done by transferring (■) to B.

However, with the above method, if you rewrite the entire part that is displayed by the cursor, if you use EXOR, it will not return to its original state (it will leave some garbage), and if you use the method that does not use EXOR, it will rewrite when you move the cursor. There are major drawbacks such as parts not being able to return to their original state.Moreover, this drawback is further exacerbated by the fact that the location where the twerk is located is most likely to be rewritten.

Therefore, before rewriting the image memory, a method has been adopted in which the cursor must be completely oiled before rewriting. However, with this method, the Q cursor flickers because the cursor is always erased when rewriting the image memory.
It had drawbacks such as being unable to move.

[Purpose of the invention]

An object of the present invention is to provide a display device that eliminates the above-mentioned drawbacks.

[Summary of the invention]

The present invention relates to a display device in which a cursor is slammed into an image memory, and when rewriting the image memory, a detection method is provided to detect whether the cursor is displayed in the area to be rewritten. A circuit is provided, and only when it is detected that a cursor is displayed, the cursor is erased before rewriting the image memory, and the cursor is lit again after the rewriting is completed.

〔Effect of the invention〕

According to the present invention, a pattern such as a cursor of any shape can be displayed at any position with a slight increase in the amount of hardware compared to conventional display devices. In addition, since the cursor can be smoothly erased and lit when rewriting the display, the inconvenience associated with the presence of the cursor when displaying or rewriting characters, figures, etc. is eliminated, and efficiency is greatly improved. This has the advantage that it improves the performance of the user, and also minimizes clutter on the display screen (such as flickering of the cursor).

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 6 is a configuration diagram showing an embodiment of the present invention.

In this FIG. 6, (13) is a write control unit used in a normal graphic display device.

(14) is an image memory, and (15) is a display section. (
16).

(17) is a register that holds the position X, Y where the cursor is currently displayed, (18a), (18b) is the difference between the cursor display position and the position of the image to be written to the image memo IJ (1, 4) This is a subtracter that calculates . register(
16) The contents of (17) are updated by the write control unit (3) every time the cursor is moved.

Moreover, (19a) and (19b) are respectively subtractors (18a)
), (18b) and cursor size cx, cy
This is a comparator that compares the values of registers (20) and (21) that hold . Comparators (19a) and (191)) are each subtractors (18a).

The absolute value of the output value of (18b) corresponds to the register (
20) If smaller than the value of (21), vc % 11
T, output through.

(22) is a gate that takes an AND of a match in the X direction and a match in the Y direction. This AND gate (22) is a comparator (
Only when the outputs of 19a and 19b are both VC'IN, the output becomes 11''. This signal is treated as a recondition code or a status signal to be sent to the write control section (13).

Next, the flow of operation of this embodiment will be shown.

The write control unit (3) accesses the subtracters (18a) and (18b) every time information to be written to the image memory (14) is input from the CPU (not shown), and the address x' of the image memory (14). Send y'. This subtractor (
18a).

(18b) is the cursor display position and image memo (14)
The difference from the write address to IX-X'l, ly -
yi is required.

For example, if the cursor is cross-shaped, the information does not necessarily represent all parts of the cursor.
In a) and (19b), there is a subtractor (18a).

(18b) and the output from the power tool size register (
20) It is determined whether the write address is within a predetermined area including the cursor by comparing the contents cx and cy of (21) respectively. Comparators (19a) and (19b) are each IX
-X'l<CX, l Y-Y %1 if l<CY
Output. This X, Y comparator (19a), (19b
) is 1 only when the outputs of the AND gate circuit (22
) becomes 1, which means that the cursor has been detected at the position to be written into the image memory (14), and this state is sent to the write control section (3).

FIG. 7 is a flow diagram showing the operation of the write control section (13).

First, when the write control section (13) detects that the output of the AND gate (22) is 11' before rewriting the image memory (14), it executes the routine shown in FIG. 7 (al). If the cursor is not lit, return without doing anything. If it is lit, erase the cursor, set a flag indicating that the cursor has been temporarily erased, return, and rewrite the image memo IJ (14). Next, the write control section (13) writes the image memory (1
When the rewriting in step 4) is completed, the routine shown in FIG. 7(b) is executed. In other words, if a flag is set, the cursor is lit again, the flag is cleared, and the next rewrite is started.

By performing such processing, the user can rewrite the screen without being aware of the presence of the cursor. There is no need to erase the cursor when rewriting an area where the cursor is not displayed. Since the cursor is small compared to the entire screen, it has almost no effect on the rewriting speed, and the rate at which the cursor disappears is very low (usually not noticeable).

As shown in Figure 8, when this cursor is detected [the box is not necessarily the size of the cursor (23)'! It is not necessary to completely reflect the cursor (it may be an extra area (24) containing the cursor. Therefore, the number of bits for the cursor size register, cursor position register, etc. can be reduced compared to the actual resolution. .

Furthermore, instead of the cursor size, the upper left point position and lower right point position of the cursor pattern may be specified.

As is clear from the above explanation, according to the present invention, a highly flexible cursor can be easily realized by adding simple hardware without affecting the rewriting speed of the display. Very obvious.

Furthermore, the detector of the present invention is not only used for cursor detection (
If it can also be used to detect commands, etc., a wide range of applications can be considered. In short, the present invention can be used with various modifications within the gist of (11) without tax exemption.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a character code memory and a tribulation. Fig. 2 is a block diagram of a conventional character display, and Fig. 3 is a block diagram of a conventional image display.
41'Zl, FIG. 5 is a diagram showing an example of a cursor display method,
Fig. 6 is a block diagram showing a complete example of a fruit market according to the present invention, Fig. 71゛4 is an operation flow diagram of an embodiment according to the present invention, and Fig. 8 is a diagram showing an example of a cursor detection range and a cursor 1' range. . 1...CRT, 2...Code memory, 3...Timing logic, 4...Character generator, 5
...Attribute logic, 6...Character code,
7...Attribute, 8...Kanl memory, 9
...Readout control unit, 10...Display position, 11...
・Timingbe 12.14...Image memory, 13...
@Input control unit, 15...Display, 16.17
...Cursor position register, 18a, 18b
- Subtractor, 19a. x9b... Comparator, 20.21... Cursor size register (12) register, 22... AND gate circuit, 23... Cursor range, 24... Cursor detection range.

Claims (3)

[Claims] (1) In a display device having a display section, an image memory that holds content to be displayed on the display section, and a write control section that controls writing of data to the image memory, specific data in the image memory is provided. specific data storage means for retaining the storage position and size of the image memory, and data to be written into the image memory and the writing position thereof each time the writing position and the content stored in the specific data storage means are stored. 1. A display device comprising: detection means for detecting the presence or absence of specific data by performing a comparison. (2) The detection means detects whether or not the specific data is present within a predetermined range wider than the writing position occupied by the data to be written in the image memory. display device. (3) The specific data is a cursor pattern. :,! f
A display device according to claim 1.