JPS58140788A - 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 The present invention relates to a color display device in which bright spots of an image formed on a CRT display screen are displayed in a suitably designated color, and in particular to a color display device in which a certain color is changed to an arbitrary color. The purpose of this invention is to provide a display device that is devised so that it can perform the following functions.

Generally, in a raster scan display device, each raster is divided into a large number of pixels, and the brightness is controlled pixel by pixel. For example, image information sent by an appropriate method via a computer or television broadcast radio waves is written into a brightness control memory, and the brightness control memory and pixels on the raster are made to correspond one-to-one to synchronize with the raster scan. Image information written by memory reading is displayed on the screen.

And in the case of this kind of color display device,
The brightness of the three primary colors of red (R), green (G), and blue (B) is controlled pixel by pixel, and for example, the image information itself written in the brightness control memory mentioned above is preset as appropriate for R, G, and B. It consists of color information that specifies one of the seven colors obtained by the combination, and when the above-mentioned image information is read out in correspondence with the pixels on the raster, each CRT of R, G, and H
If the brightness of the drive circuit is operated based on this color information, the written image information will be displayed in color for each pixel.

By the way, in this type of color display device, character codes and color information codes sent from a computer etc. are displayed as specified, or even if it is possible to change the color information to any color information, all characters are changed. It was something to put away.

The display of this type of color display device, which is generally used in offices, etc., is based on a certain color, for example, green.Other colors are used to make things stand out, such as heading items or status display. There are many.

Therefore, in the former case described above, if the user continues to look at a specific color, its complementary color will remain as an afterimage, and for example, if the user continues to look at a green character display, white objects may appear reddish. In addition, in the latter case, the complementary color afterimage phenomenon can be prevented by changing the colors appropriately, but since all the characters are changed, the characters that you want to make especially stand out are also changed from the base color. , and the original multicolor display effect of the color display device was lost.

Therefore, the present invention corrects the latter drawback and makes it possible to change colors arbitrarily so that the complementary color afterimage, which is the former drawback, does not remain while maintaining the display effect of multicolor display.

Next, the display control configuration of the color display device will be explained according to the drawings. First, FIG. 1 shows a conventional display control configuration, in which 1 is an electronic computer (computer main body) which outputs character information and color information 10. Reference numeral 2 denotes an information processing circuit including a brightness control memory, a color information memory, and a timing control circuit, and stores character information and color information sent from the computer 1 by an appropriate method into these memories.

In other words, the brightness control memory in which character information is written has a perfect one-to-l correspondence with the pixels on the CRT screen raster, and outputs the brightness control pulse 20 obtained by reading the memory in synchronization with the raster scan. do.

In addition, the color information memory stores only the color information sent with the character information, and red (R) is produced by reading out the memory in synchronization with the raster scan.

A color information signal 21 consisting of a combination of green (G) and blue (B) is output.

The timing control circuit outputs a latch signal 22 for latching at a period corresponding to the number of horizontal pixels for one character output from the brightness control memory. For example, if a character pattern has a 5.times.7 dot structure and the character spacing is 2 dots in the horizontal direction, each 7 dots in the horizontal direction are output at a corresponding period.

Reference numeral 3 denotes a color signal control section, which includes a color code latch circuit 31 that latches the color information signal 21 in response to a latch signal 22, and an AND gate group that gates the output of the color hood latch circuit 31 with a brightness control pulse 20. 32.

Reference numeral 4 denotes a drive circuit into which the output after waveform shaping the output 30 from the AND gate group 32 of the color signal control section 3 is introduced, and after level conversion to a high voltage is performed here, it is sent to the CRT 5. displayed on the screen.

Therefore, with this configuration, display is performed as specified in accordance with character information and color information sent from the computer.

Next, FIG. 2 shows a display control configuration according to the present invention, and particularly shows the configuration of the color signal control section 8 in FIG. 1, and the other configurations are the same as in FIG. 1.

In FIG. 2, the latch output 3B of the color code latch circuit 81 is introduced into the switching circuit 34 and the matching circuit 85, respectively.

The other input of the minus number circuit 35 is a signal from a first switch group 86 consisting of three switches corresponding to R, G, and B, whose color information can be set and operated from the outside. . Therefore, the minus number circuit 35 detects whether the output of the latch circuit 31, which is the color information specified by the computer, matches the color information specified by the first switch group 36. The coincidence signal 37 of the minus number circuit 35 is inputted to the switching circuit 34 as a switching signal.

The switching circuit 34 also includes the latch output 33 and R, G, B, which can set and operate color information from the outside.
A second switch group 88 consisting of eight switches corresponding to
1, these inputs are selectively switched and output to the AND gate group 32 at the subsequent stage. That is, when the coincidence signal 37 from the coincidence circuit 85 is inputted, the switching circuit 34 makes the input signal from the first and second switch group 88 valid, and when the coincidence signal 87 is not inputted, the switching circuit 34 makes the latch output 8B valid. It shall be valid.

For this reason, the user of the color display device manually operates the first switch group 36 to specify the color to be changed in the color information sent from the computer.
By operating the second switch group 38 and specifying the changed color, the specified color information can be changed to any color.

The above embodiment of the present invention will be further explained based on the time chart of FIG. In this figure 3, 5×7
This figure shows an example of displaying one row of dots in the horizontal direction on the screen when the character pattern has a dot structure and the character spacing is two dots in the horizontal direction.

By the clock pulses corresponding to the pixels on the screen shown in Fig. 3(a), color information signals for 7 horizontal pixels of one character (2 dots are the character interval) are generated as shown in Fig. 8(b). Output. Here A, B, C, D red, green.

Code and represent the three primary colors of blue! /) Ru. Also, the third
Figure (C) shows the number of horizontal pixels of the character pattern, 5 dots (
The brightness control signals for each of (1) to (2) are shown. These ■ to ■ may or may not result in pulse output depending on the character pattern.

FIG. 3(d) shows a latch signal for latching the color information signal. Fig. 8(e) shows the color information of switch group 1 in a hood, and here it is the color code of A.
Therefore, the color designation for the first character is the same, but the color designations for the second and subsequent characters are different. therefore,
The match signal in FIG. 3(f) indicates that only the first character is in a match state.

Figure 8) is a coded representation of the changed color designation of switch group 2, and shows that the color is changed to C. Therefore, as shown in FIG. 8(h), the color control signal has the first
This shows that only the color information of the first character is changed from A to C, and the color information of the second and subsequent characters is outputted without being changed.

From the above, it becomes possible to change a certain color (designated by the first switch group 86) to an arbitrary color (designated by the second switch group 88).

Therefore, in the color display device of the present invention, even when looking at the displayed color on one screen of the display for a long time, it is possible to prevent the occurrence of a complementary color afterimage by appropriately switching the switch. It also has the feature that the user can change the color specified at the time of use to the desired color.

[Brief explanation of drawings]

FIG. 1 is a circuit pull diagram showing a conventional display control configuration, FIG. 2 is a circuit block diagram showing main parts of the display control configuration of the present invention, and FIG. 3 is a time chart showing the operation of FIG. be. 1: Electronic computer, 2: Information processing circuit, 8: Color signal control section, 4 drive circuit 1.5: CRT. 31: color code latch circuit, 34: switching circuit, 35 double matching circuit, 86: first switch group, 38: second switch group.

Claims (1)

[Claims] 1. A color display device in which a bright spot of an image formed on a CRT display screen is displayed in an appropriately designated color, wherein image information to be displayed on the screen is written and a raster image is displayed. A brightness control memory that outputs brightness control pulses that control the brightness of the three primary colors by reading out in synchronization with the raster scan in one-to-one correspondence with the pixels of However, a color information memory in which color information is written and read out in synchronization with raster scanning, a latch circuit that latches the color information read from the color information memory at a cycle of one character, and a latch circuit that latches the color information read out from the color information memory at a cycle of one character; a first operation means for specifying a color to be changed among the colors displayed based on the color information, and a match detection between the color information output from the latch circuit and the color information specified by the first operation means. a matching circuit for setting the changed color information for the color specified by the first operating means; and a matching circuit for setting the color information output from the latch circuit and the second operating means. a switching circuit for selectively switching the set color information and controlling the brightness using the brightness control pulse and guiding the information to the CRT drive circuit; 1. When a match is detected in the color information specified by the first operating means, the switching circuit is controlled to take in the color information from the second operating means as valid, and the color specified by the first operating means is transferred to the second operating means. A color display device characterized by changing the display to a set color using means.