JPS60125886A - Display for image and character - 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 (Technical Field) The present invention relates to a CRT display device having a function of simultaneously displaying images and characters.

(Background technology) In a CR,'F display device that has the function of displaying images (figures) and characters (letters) at the same time, when the image display and character display are displayed overlappingly, the character display is displayed with priority over the image display. However, when the image display and character display are in the same color, it is naturally difficult to tell which part is the character display, and when the image display and character display are in different colors, the colors overlap with each other. This had the disadvantage that the character display became very difficult to see.

FIG. 1 shows a conventional circuit that combines image video and character video supplied from the outside and displays them on the screen of a CR/T monitor.

The character video supplies the data of RAM (1111) to the character generator (12), and the above
Obtain a parallel signal that becomes a character pattern corresponding to the data, supply this parallel signal to a shift register (13) to convert it into a serial signal, and combine it with the image video by an OR circuit (3) to display it on a CRT monitor (4). display on the screen. On the other hand, image video supplied from outside (1)
is when there is no character video displayed at the same time (14
) can pass through the gate (2), and the image video that has passed becomes a signal to be combined with the character video in the OR circuit (3).

Using the above method, the coloring image display and the letter r A
For example, if we are trying to display the character J at the same time, first the image video supplied from the outside will be displayed as shown in Figure 2, and this will pass through the gate (2) explained above. 1'', only the character display part of the letter rAl will be cut, as shown in Figure 3.
This is combined with a character video displaying the character "1△" as shown in Figure 4, and CI (when displayed on the screen of the T monitor, fI°C as shown in Figure 5).

In this way, with conventional methods, if the image display and character display are the same color, the character display naturally becomes part of the image display and becomes unreadable, so the image display is displayed at normal brightness. However, the character display is made to be readable by displaying it at a higher brightness than this. However, with this method, the display is quite difficult to see.

Furthermore, even if the colors of the image display and character display are different, the resolution of the color of the human eye cannot follow the color resolution of the adjacent parts of each display, and the colors appear mixed, resulting in a display that is difficult to see. turn into.

The reason why these displays are difficult to see is that in each case, the image display and the character display are displayed at the same time, so they are adjacent to each other.

(Problem to be solved by the invention) An object of the present invention is to solve the visual problem when an image and a character are displayed in a superimposed manner.
The display around the character display is hidden, and as a means of doing so, a character generator and a shift register are provided to control display/non-display of the image display, separate from the character generator that is the signal source for character display. It is in.

In this invention, the adjacent parts of the image display and character display that are displayed simultaneously are hidden and the respective displays are separated, so that the display is easy to read without being affected by each other.

(Structure and operation of the invention) FIG. 6 shows an embodiment of the present invention, in which a character generator (time and shift register (23)) is newly added to the conventional circuit shown in FIG. Let's take as an example the case where we want to control the supplied image video and, as in the explanation of the conventional method, we want to simultaneously display the filled in/character display and the character display of the letters rA-J. The character video is the same as before, in which the data on the RAM surface is supplied to the character generator (12), which is then supplied to the character pattern star (13) corresponding to the 1° A tvI data and converted into a serial signal. , CR, T monitor (4) screen-F is displayed as shown in Fig. 9. At the same time, the above-mentioned R, AM data are supplied to the newly installed character generator (22). , obtain a parallel signal with a character pattern as shown in Figure 7, supply this parallel signal to a newly installed shift register (23) to convert it into a serial signal, and invert this signal as necessary (I4 ) and gate of image video supplied from outside (2)
control. Therefore, when the image video supplied from the outside passes through the second gate (2), it becomes an image video with an image pattern as shown in FIG.
When the images are combined and displayed on the screen l of the CRT monitor (4), the adjacent portions of the image display and character display are hidden as shown in FIG.

(Effects of the Invention) As explained above, this invention controls the new character generator shift shifter, disk, or Funabouti Inoji Video, and hides only the adjacent portions of the image display and character display. Even if the display and character display have the same color and brightness, the character display can be read and the original form of the image display can be maintained. Further, even if the colors of the image display and the character display are different, since the two displays are not adjacent to each other, the resolution of the color of the human eye can follow this, and the colors will not be mixed together and become difficult to see.

This method of hiding the periphery of the text and overlapping it with the image display is useful not only when displaying on a CRT monitor screen, but also when displaying on paper like a printer, or on a panel display. The same can be used for display.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional device for displaying characters and images simultaneously on the screen of a CRTT monitor. This is an example in which a character display of the letter "A" and a fill-in image display are displayed simultaneously. FIG. 6 is a block diagram of an embodiment of the invention. Figure 7, Figure 8,
FIGS. 9 and 10 show examples of displaying the same as above according to the present invention. 1; Image video, 2; Gate, 3; OR circuit, 4; CRT monitor, 11; ROM
12, 22; Character generator, 13, 23
;Shift register. Patent applicant Oki Electric Industry Co., Ltd. Patent application agent Megumi Yamamoto −

Claims (1)

[Claims] Data from the memory is supplied to a character generator to obtain a parallel signal that corresponds to the data in this memory and becomes a character pattern.This parallel signal is supplied to a shift register to convert it into a serial signal, and this serial signal and external In a display device that superimposes image video signals supplied from a CRT monitor and displays them on the screen of a CRT monitor, a second
A character generator and a second shift register are provided to obtain a serial signal different from the above serial signal, and this serial signal controls the image video signal supplied from the outside to control the image video signal 1" adjacent to the character display. An image and character display device, characterized in that a display portion is hidden by the second character shift register and the second shift register.