JPS6113235B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device, and more particularly to a display device suitable for displaying figures and the like by raster scan.

FIG. 1 is a block diagram showing an example of a conventional display device using a cathode ray tube (CRT) as a display device.

Information sent from a computer or input data from a keyboard, light pen, etc. is written via an interface circuit 10 into a refresh memory 20 that stores display information for one screen. This stored information is repeatedly read out in synchronization with the display timing using an address signal sent from the timing circuit 50. This read information and the raster signal from the timing circuit 50 are supplied to the character generation circuit 30, and a video signal is read out. This read video signal is combined with the color information, blink information, etc. read out from the refresh memory 20 by the video control circuit 40, and sent to the cathode ray tube display device 60, and is combined with the synchronization signal from the timing generation circuit 50. displayed on a cathode ray tube.

Figure 2 is a pattern showing the temperature state of the reactor core on a CRT. Each pattern represents a temperature difference and is identified by a different color (blue, yellow, red, etc.). At this time, for example, if the temperature around the outside rises a little and you want to change blue to sky blue, the program becomes very complex because the addresses on the screen that change the color are scattered, the amount of data to be transferred is large, and the responsiveness is poor. is the current situation.

In particular, the amount of displayed information has recently increased from 1000 characters per screen.
It is no exaggeration to say that this responsiveness is so important that it determines the pros and cons of a process control system. This was becoming a factor, and some kind of response was desired.

The display method will be explained in detail with reference to FIGS. 3a and 3b. When displaying the contents as shown in FIG. 3a, the display can be performed by storing information such as b for each character in the refresh memory 20. For example, in Figure 4a, A, B, C,
If it is desired to change the display color of D from red to green, green data may be written on the refresh memory as shown in FIG. 4b. Therefore, when the addresses are discontinuous as in the above-mentioned nuclear reactor pattern, it is necessary to specify the address and write color information each time, which causes the problem that the program becomes complicated.

An object of the present invention is to provide a display device that improves response speed and processing performance when changing display information.

The present invention adds information to each character to determine whether to display the color information of the refresh memory or the color information of an external register on the refresh memory, and also provides color information that can be written and read from the outside. An external register is provided, and one of the aforementioned color information is sent to the next stage by a data changeover switch based on the additional information of the refresh memory.

FIG. 5 is a block diagram showing an embodiment of the present invention. In FIG. 5, the same members as shown in FIG. 1 are given the same reference numerals.

In the memory of the refresh memory 20, whether the display is based on the color information of the refresh memory 20 or
Information for identifying the character is added to each character using color information from an external register, and the output of the refresh memory 20 is sent to the pattern generation circuit 30.
In addition, it is output to the changeover switch 80. The refresh memory 20 has a format as shown in FIG. 6, and color information is added at the beginning.
The interface control circuit 10 includes a register 70.
is connected and stores color information for each color from the outside. This output is sent to a changeover switch 80, which outputs the contents of either the refresh memory or the register 70 to the video signal control circuit 40. By rewriting the data in the register 70, the same function as conventional data rewriting using refresh memory data can be achieved, and data can be transferred only once. Of course, the contents of the additional bits in the refresh memory at this time must be written to the address corresponding to the outer periphery of the reactor so as to select the external color register.

FIG. 7 shows the register 70 of the embodiment shown in FIG.
and a detailed block diagram of the changeover switch 80.

The refresh memory 20 is a memory that stores display information for one screen, and the format shown in FIG. 6 can be shown in more detail as shown in FIG. 8. This data format includes a character code that indicates what character or pattern to display, color information that determines the display color, and blink information that determines whether or not characters blink, as well as a new color information register number that specifies an external register number. It is composed of information and selection information as to whether to use refresh memory information or color register information as color information. The display character code 24 read out from the refresh memory 20 is sent to the pattern generation circuit 30, where it is converted into a video signal. The blink information 25 from the refresh memory 20 is also sent to a video signal control circuit 40, where it is combined with color information to generate a video signal to be sent to a cathode ray tube display device.
The register 70 includes color registers 71, 72, 7
Consisting of 3,74 (No. 1 to No. 3), each of them has the following:
Strobe signals 12, 13,
14 and 15 are supplied, and data 11 from the outside is set. The data 11 at the time of setting includes target color information. The changeover switch 80 has a decoder 81, gates 82, 83, 8
It consists of 4, 85, and 86. The decoder 81 receives a color information selection signal 21 from the refresh memory 20.
is "1", it becomes Enable (valid), and the color register No. information 2 from the refresh memory 20
Decodes the 2 bits of 3 and sends it to the next stage gate circuit 8.
A signal for enabling any one of 3, 84, 85, and 86 is output. Gate circuit 8
3, 84, 85, and 86 use signals from the decoder 81 to transfer the contents of any of the color information registers connected above to the video signal control circuit 40 of the next stage.
It functions to output to. The gate circuit 82 is enabled when the color information selection signal 21 is "0", and plays the role of outputting the color information 22 read from the refresh memory 20 to the video signal control circuit 40 at the next stage.

FIG. 9 is a display example when the present invention is applied. It is assumed that the refresh memory 20 and the color registers 71 to 74 store information as shown in FIG. 9a. At this time, the display on the CRT is as shown in Figure 9b.
First, for the displayed characters "ABCD", since the switching signal information is "0", red is displayed according to the color information of the refresh memory 20 shown in FIG. 10. Next, the display of "EFGH" will be displayed in the color of the color register because the switching signal information is "1", and since the refresh memory register number is "0", the color register will be displayed. It will be displayed in yellow with 0. Similarly,
"IJKL" is displayed in a blinking sky blue color.

Although the specific embodiment of the present invention has been carried out with respect to the most frequently used colors, it goes without saying that by increasing the registers mentioned above, the same can be applied to blinks and display characters.

As described in detail above, according to the present invention, a display device with good responsiveness can be provided, which is particularly advantageous when applied to a process control system.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an example of a conventional display device, Figure 2 is a pattern diagram of the temperature state of a nuclear reactor core, Figures 3a and b are diagrams of conventional display screens and stored data, and Figure 4a , b are diagrams of other conventional display screens and stored data, FIG. 5 is a block diagram showing an embodiment of the present invention, FIG. 6 is a format diagram of a refresh memory according to the present invention, and FIG. 7 is a diagram of a refresh memory according to the present invention. FIG. 8 is a detailed format diagram of the refresh memory according to the present invention, FIG. 9 a and b are register data examples and display screen diagrams of the present invention, and FIG. FIG. 9 is a refresh memory format diagram according to FIG. 9; 20... Refresh memory, 30... Pattern generation circuit, 40... Video signal control circuit, 70... Register, 71-74... Color register, 80... Changeover switch, 81... Decoder, 81-86... Gate.

Claims (1)

[Claims] 1. A refresh memory that stores display information;
A display device comprising a pattern generator that generates a video signal based on output data of the memory, and a display device that displays based on the video signal output of the generator and horizontal and vertical synchronization signals, A readable register, means for adding information specifying storage of specific information in the register, and switching signal information between the output of the register and the output of the refresh memory, and deciphering the switching signal by the means. A display device comprising: a switching circuit that outputs the output of either the register or the refresh memory as display control information. 2. The display device according to claim 1, wherein the information stored in the register is color information.