JPS61275797A - Color 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 (Business Application 1Af) The present invention relates to a color display device connected to an electronic computer.

(Prior Art) In conventional color graphic display devices connected to computers, in order to display seven colors, images are displayed in one-to-one correspondence with the three primary colors of red, green, and W, as shown in Figure 1. If all memory planes 1 to 3 are required and an tributary machine fM (for example, a printer machine m14) e is added,
Since an tributary memory plane number is also required, it is rarely necessary to use a total of four video memory planes.

In addition, in Fig. 1, 5 to 8 are parallel % series converters, 9 to 11 are AND gates, 12 is a Nandt gate, and 13 is a force? -0R
It is a T monitor.

(Problems to be Solved) Recently, there has been a strong demand for improvement in the display capability of color display devices such as industrial monitoring devices, and the capacity per plane of video memory has been increasing. However, depending on the application, the display ability may be limited due to space or price considerations.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple color display device that can display multiple colors using fewer video memory planes than the conventional system.

(Means for Solving the Problems) In order to achieve the above object, the present invention requires the following configuration.

That is, this device 8A has the same video memory plane as the four monochrome CRT display devices, a plane identification circuit, a latch circuit that holds one color designation and blink designation information, a blink plane selection circuit, and a designated color signal generation circuit. Times lol
rt- Increase the number of memory planes in a % isographic manner by combining each provision and video memory, and for each plane,
Color display by individually specifying color and blinking
DESCRIPTION OF THE PREFERRED EMBODIMENTS Practical embodiments of the present invention will be described below with reference to the drawings.

(Embodiment) Figure 2 shows the basic configuration of an embodiment of this invention.
The same two video memory planes 21.22'' It as used in the monochrome CRT display device are used, and each video memory plane 21.22 is connected to the color selection circuit z6 via parallel and serial converters 24.25, respectively. The next color designation signal is sent to the color selection circuit 26 by the blink signal tBt''m, and the color designation latch circuit 2
3? :Color〇RT monitor 2 by giving through
7, it is possible to display any three colors out of one color at the same time, and by specifying a color every m layers, a total of seven colors can be displayed. It comes out.

Figure 3 shows a specific configuration in which the output data of two video memory planes 21 and 22 are parallelized.

Convert the data using a series transformer P24.25.

The bl-plane identification circuit 261 selects the four states shown in the first fl, namely, #llI display (Y), 1@1 plane (Y
Select either the second plane 7 (Ys) or the third plane (Y4), and use this signal and the color specification code of the corresponding plane held in the latch @ path 23 to generate the corresponding specified color signal generation circuit. (266 or 267 or 268) to obtain a predetermined video color No. 15 (Rf! No. 1, G signal, B signal) fc.

Further, if the blink plane control information is input to the latch circuit 23, the corresponding plane is input to the plane identification circuit 2.
When selected at 61, either the AND gate 263, 264 or 265 flashes in synchronization with the 1!1 pre/re signal tH. And blink plane selection lol
If no blink is specified in r282, no blink will be displayed.

The above operation is performed for each display dot, and it is possible to display colors in units of dots.

Moreover, by specifying a predetermined color each time the screen is switched and by making two clicks to the blink control sound latch circuit z3, three colors can be displayed simultaneously on the same screen, and a total of seven colors can be displayed on the same screen.

(Modifications and Applications of the Invention) (1) In the above embodiment, the three planes are the same, but if the colors of the two planes are fixed, the circuit can be further simplified.

(2) If you toss the video memory plane t-3 plane, it becomes possible to simultaneously display 6 colors + attribute (blink) in the same way.

(Effects of the invention: Although limited to three-color display on the same screen, color display is possible with a smaller number of video memory planes than in the conventional system, and a low-cost color graphic device can be realized.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of a conventional device. 2
The figure is a block diagram showing the basic configuration of an embodiment of the present invention, and FIG. 3 is a block diagram showing its specific configuration. 1 and 2-video memory plane %3...color specification latch circuit, 5...parallel to serial converter, 6...color selection circuit, 7...color CRT monitor.

Claims (1)

[Claims] The video memory includes an appropriate number of video memory planes that are the same as monochrome CRT display devices, a plane identification circuit, a latch circuit that holds color designation and blink designation information, a blink plane selection circuit, and a designated color signal creation circuit. A color display device characterized in that by combining the above, the number of memory planes is increased equivalently, and color and blink specifications are individually specified for each plane to realize color display.