JPS62205391A - 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 [Industrial Field of Application] The present invention relates to a display device having display image information storage means.

[Prior Art] Conventionally, CRT display devices and the like have been equipped with a display image memory for one screen or more, and have displayed the contents of the display image memory as they are.

When attempting to change the display, the display image memory is rewritten, and the rewritten information is sequentially updated and displayed. For example, the image memory is sequentially accessed and sent to a CRT display device, and the sent display data is sequentially displayed from the upper left of the screen.

[Problems to be Solved by the Invention] Therefore, when display data is to be significantly rewritten, the entire contents of the image memory must be rewritten each time, and the rewriting process is displayed as is on the display screen. However, there was a problem in that the display screen became unsightly.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and as a means for solving the above-mentioned problems, for example, in this embodiment, a display means for displaying data, and a display means for displaying data; image storage means for storing display data for at least one screen on the display means;
holding means for holding specified display data; selection means for selecting either the data held by the holding means or the display data from the image storage means; and a display for displaying the data selected by the selection means on the display means. and control means.

[Operation] In the above configuration, when rewriting the image storage means, etc., by controlling the data held in the holding means to be displayed during that time, the state of rewriting the display data can be displayed as is on the display screen. It is possible to provide an easy-to-read display device with no clutter.

[Example] Hereinafter, an example according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the invention, in which numeral 1 is a CPU that controls the entire water system;
1 executes the control procedure shown in FIG. 3 stored in the ROM 2. 2 is a read-only memory (ROM) that stores CPU control procedures, etc., 3 is an image memory that stores display data for one screen of the CRT 8, and 4 is a CPU
5 is a control latch 5 that outputs a mode signal 14, which is a control signal for selectively displaying one of the display data from the image memory 3 and the 1 data latch 4; The image memory 3, data latch 4, and control latch 5 are connected to a data bus (DB
) 10 and a control bus (CB) 11 consisting of address data and control signals, and various data are set and rewritten under the control of the CPU, and at the same time read and output is performed.

6 selects either the memory data VD12 from the image memory 3 or the specified data CD1.3 from the data latch 4 and outputs it as display data DD15;
A display control unit that outputs a control signal 16 to a CRT interface 7 based on a signal from the CBII; 7 is a CRT interface that controls display of the CRT 8 according to the DD 15 and control signal 16 from the display control unit 6;
8 is a CRT display device.

Details of the display data selection section of the display control section 6 are shown in FIG. Memory data VD12 from the image memory 3 and designated data CD13 from the data latch 4 are connected to the input and B inputs of the data selector 9 in the display control unit 6, respectively, and the mode signal 14 from the control latch 5 is connected to the selector. The mode signal 14"1"° is manually input to the A/B selection terminal of
In this case, if A input is mode signal 14"O", B
The input is selected, output as display data DD, and C
is sent to the RT interface 7. The CRT interface 7 displays the sent display data DD15 on the CR1 display device 8.

The display control of this embodiment having the above configuration will be explained below with reference to the flowchart of FIG.

The CRTI checks in step s1 whether or not it is necessary to rewrite the entire display screen of the CR1 display device 8 (rewrite the entire area of the image memory 3), and if it is not necessary to rewrite it, the process proceeds to step s2 and the control latch 5 is 1". As a result, the data selector 9 becomes the mode for selecting A manual power, and the memory data VD1 from the image memory 3 is set.
2 is output to the display data DD15.

Therefore, the contents of the image memory 3 are sequentially displayed on the CR1 display device 8. Then, the following step S3
In step S4, it is checked whether or not it is necessary to rewrite a part of the image memory, and if rewriting is necessary, the necessary data is rewritten in step S4, and the process is returned. On the other hand, if there is no need to rewrite, the process returns as is.

If all display data is to be rewritten in step S1, the process proceeds to step S5, where the CPU 1 stores specified data to be displayed on the CR7 display device 8 while the image memory 3 is being rewritten in the data latch 4, for example, the entire screen is filled with a certain color. Set data or data that can display a predetermined message.

Then, in step S6, the control latch 5 is set to O° so that the specified data CDl3 from the data latch 4 is selected as the display data DD15. As a result, only the designated data CD13 will be repeatedly displayed on the entire display screen of the CR1 display device 8 as shown in step S7.

Note that display control during this time does not need to wait for CPUI control, so the entire CRT display screen immediately changes to the specified data C.
It becomes Dl3. In this state, the CPU rewrites the contents of the image memory 3 to desired data in step S8. Therefore, while the image memory 3 is being rewritten, the rewriting state is not displayed on the CR1 display device 8.

After the rewriting is completed, the control latch 5 is set to 1' in step S9, and the data in the image memory 3 is sent out again using the display data DD15 as the memory data VD12.

As explained above, according to this embodiment, when rewriting the entire area of the image memory, the contents of the image memory are not displayed and arbitrary specified data is displayed in a short time, thereby eliminating the unsightly screen. effective. Further, in the above description, the designated data CD13 is selected and displayed when the entire screen is rewritten, but this may be done when a certain amount or more is rewritten.

[Effects of the Invention] As explained above, according to the present invention, when the image storage means is rewritten, etc., the state of the rewriting of the display data, etc. is displayed on the display screen by controlling the type of display of the data held in the holding means. It is possible to provide an easy-to-see display device that does not display images as they are.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment according to the present invention, FIG. 2 is a detailed diagram of the display data selection section of the display control section shown in FIG. 1, and FIG. 3 is a display control flowchart of the embodiment. . In the figure, 1...CPU, 3...Image memory, 4...
Data latch, 5... Control latch, 6... Display control unit, 7... CRT interface, 8... CRT display device, 9... Data selector.

Claims (3)

[Claims] (1) A display means for displaying data, an image storage means for storing display data for at least one screen on the display means, a holding means for holding designated display data, and data held by the holding means or the image A display device comprising: a selection means for selecting one of display data from a storage means; and a display control means for causing the display means to display the data selected by the selection means. (2) Claim 1, characterized in that the holding means holds display data for one character designated by another device.
Display device as described in section. (3) The display device according to claim 1 or 2, wherein the selection means selects and outputs the data held by the holding means when rewriting data stored in the image storage means.