JPS6060689A - Graphic 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 relates to a graphic display device using a CRT or the like, and more specifically, it proposes a graphic display device with improved operability of characters.

CI? 2. Description of the Related Art A graphic display device is known that includes a display section such as T, an image memory corresponding thereto, and input means for FW images such as a keyboard. In the conventional graphic display device, as shown in FIG. A cross-shaped cursor 2 is often displayed on the TI. In the case of using this method, if you want to use this cursor 2 to indicate the starting point or ending point of the next line to be drawn after a figure has already been drawn, move the cursor 2 to the desired starting point or ending point using an input means such as a keyboard. However, if the starting point and ending point are already on the t+'M line, it is extremely difficult to match the cursor 2 position with this line. One method to solve this problem is to enlarge the area near cursor 2 in such a case to make it easier to match cursor 2 with the already drawn line. In some cases, the burden on the hardware and software for enlarged display is heavy, and the enlarged display makes it difficult to see the entire drawing.

The present invention has been made in view of these circumstances,
If the cursor matches the above line or the displayed figure in Figure 1, etc., the cursor appears cJ: 1. ′
−.

It is an object of the present invention to provide a graphic display device in which the brightness of the cursor position of the displayed graphic is changed so that matching between the two can be easily determined, thereby facilitating drawing or input operations.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof.

FIG. 2 is a block diagram schematically showing the structure of the graphic display device according to the present invention. The display section 11 using T or the like displays il! The display data stored in the I-image memory 12 is configured to be displayed under the control of the display control section 13.

A predetermined address of the image memory 12 corresponds to each dot serving as a display unit of the display unit 11, and a predetermined address of the image memory 12
outputs an address signal DA that changes in response to display scanning on the display section 11, and display data DD at addresses in the image memory 12 corresponding to this address signal are sequentially read out to the display control section 13 and displayed. Control gB ] 3 is an input a for converting this into a video signal VD and scanning it to the display unit 1.
It is supposed to be given along with the name.

Note that the display control section 3 includes a clock signal generation circuit and a counter for generating the address signal DA, a D/Δ converter for converting display data into a video signal, and the like.

The cursor control unit 14 includes a keyboard for inputting changes in the cursor position, a microcomputer, etc. for controlling as described below. While the cursor control section 14 is performing the above-mentioned display, it issues cursor position data C1) to the display control section 13, and the display control section 13 displays the display section 1 corresponding to this data CD.
Display cursor 2 so that the intersection of the crosses is located above cursor 1.

On the other hand, as for the image memory, as shown in the chart in FIG. 3, the image memory 12 corresponding to the cursor display position
The cursor position address No. 117 CA representing the address is output, and the stored data DI) is read from the corresponding address. This reading is performed, for example, during a vertical retrace period when no display is being performed on the display section II. If there is display data already written at this address, in other words, if the cursor position is already on the line or plane of 111°I, the cursor control unit 14 will send the display data to the display control unit 13. A brightness change signal BC is output to change the display of the cursor 2 to ;l; brightness display. In response to this, the display control unit 13 outputs a video signal VD to make the cursor display high brightness.

Since the device of the present invention is configured and operates as described above, when moving the cursor to determine the starting point and ending point of the next line to be drawn, the cursor can be used to check the positional relationship between the already drawn figure, the starting point, and the ending point. Or, depending on the brightness of the corresponding part of the already drawn figure, lfi is sure if! Since J can be determined, it is possible to realize a graphic display device in which drawing or input operations are easy. The present invention has excellent effects, such as not requiring complicated software or hardware, and allowing drawing to proceed while looking at the entire drawing.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a cursor and existing figures, FIG. 2 is a schematic block diagram of the apparatus of the present invention, and FIG. 3 is a flowchart 1 to 1 showing the contents of steps 1 and 1j. 1.11...Display section 2...Cursor 12...
Image memory 13... Display control section 14... Cursor control section agent Patent attorney Noboru Kono 5! Figure l-1 μ Figure 2 Figure 3

Claims (1)

[Claims] 1. In a graphic display device in which the position of a cursor displayed on a display section is configured as address information for writing display data to an image memory corresponding to the display section, the position of the image memory corresponding to the position of the cursor is A graphic display device comprising: means for reading data at an address; and means for increasing the brightness of a cursor position when the read data is display data previously written.