JPS6167891A - 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 [Field of Application of the Invention] The present invention relates to a color display device for displaying characters generated by a character generator in appropriate colors on a color television screen or the like.

[Background of the invention]

In recent years, television receivers have become increasingly multi-functional.
One of its functions is to display text on the screen, such as the receiving channel. This involves installing a device that generates characters within the television receiver, superimposing the character signal generated by this character generator on the received image signal, or inserting a notch into the image signal. It displays text on the television screen. In such television receivers, the colors of the displayed characters are generally fixed depending on the configuration of the device that generates the characters.

Further, for example, display devices such as graphic display devices that display characters and the like in white on a monochromatic screen are known as terminal devices for personal computers.

In such display devices, parts other than characters (
Although the color of the background (hereinafter referred to as background) can be changed, the desired color is specified by an external operation.

Furthermore, in recent years, with the spread of personal computers into general households, color display devices have been developed that can be used both as display devices for personal computers and as television receivers. , when displaying a television screen, it is possible to display text such as the receiving channel on the screen, and it is also possible to display white text on a background of a specified color. However, there was no direct relationship between the color of the text displayed on the television screen and the background color when displaying white text on a monochromatic screen. If this were made possible, a separate color designation operation would be required for each color, not only when making these colors different, but also when making them the same color, resulting in a problem in operability.

[Purpose of the invention]

An object of the present invention is to eliminate the drawbacks of the above-mentioned prior art, and to simplify the color specification operation for making the characters displayed on a television screen and the background when characters, etc. are displayed in white on a monochrome screen the same color. The purpose of the present invention is to provide a color display device capable of displaying images.

[Purpose of the invention]

To achieve this objective, the present invention is capable of changing the color of characters displayed on a television screen in conjunction with a monochrome background when displaying white characters, and
The feature is that these characters and the monochrome background are always set to the same color even if they are changed.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a color display device according to the present invention, in which 1.2 is an input terminal, 3 is a matrix circuit, and 4 is a drive. Circuit, 5 is color cathode ray tube, 6 is character generator + 71 to 73 is inverter + 5
1-1~5t-s are selector switches・52-1~52
-3 is an open/close switch; 53-1 to S s -6 are selector switches * rIL+ rGw rB is a primary color signal level setting circuit.

In the same figure, the changeover switches 53-1-83-6 are switched in conjunction with each other by a single operation means (not shown), and when displaying a television screen on the color cathode ray tube 5, the switch 53-1-83-6 is closed to the contact a side, and a monochrome screen is displayed on the screen. When displaying white characters, etc., close to the contact side. In addition, the changeover switch 5
1-1 to 5l-s are 0 changeover switches 81-1-8 which are switched in conjunction with another single operation means (not shown).
1-3 forms means for specifying the color of characters displayed on the television screen, and changeover switch Sr-<~51-6 forms means for specifying the color of the background when white characters etc. are displayed on a monochromatic screen. ing. Furthermore, the open/close switch 52-1-8z
-s constitutes a means for forming white characters displayed on a monochrome screen. In this embodiment, it is assumed that white characters are displayed on a monochrome screen. A character signal for displaying the characters and a character signal for displaying the characters on the television screen are generated by a character generator 6.

Also, the letter displayed on the television screen is R (red).
, G (green), or 1 is displayed in the primary color of B (blue), and the background when white characters are displayed is also displayed in the same single color of <R, G, or B.

Primary color level setting circuits rR+ rG+ rB are R2, respectively.
(red) signal, G2 (green) signal, and B2 (blue) signal, but when these signals are simultaneously supplied to the color cathode ray tube 5 via the drive circuit 4, a white screen is displayed on the color cathode ray tube 5. These R′2
+ Set the level of G2 and B2 signals.

Next, the operation of this embodiment will be explained.

First, the case of displaying a television screen will be explained using FIG. 2. In this case, the changeover switch 53
-1-83-6 is closed on the contact a side, the luminance signal is supplied from input terminal 1, and the color signal is supplied from input terminal 2 to matrix circuit 3, and R1 (red), Gl (green) signals and Bl (blue) signal is formed. These primary color signals are supplied to the drive circuit 4 via changeover switches 53-4 + 83-5 + 83-a, respectively, to the color cathode ray tube 5.
A color television screen is displayed.

In such a situation, if you want to display characters such as the receiving channel in red on the color television screen,
Close the changeover switches 5l-s to 51-3 to the r side,
A character signal C is generated from the character generator 6 by operating means not shown. In this case, the changeover switches 5l-4 to 51-6 are also closed to the contact r side.

This character signal C is supplied to the changeover switch 83-1 as an R3 (red) signal having the same polarity as the R1 signal through the contact r of the changeover switch 51-1. This R3 signal and the R1 signal from the changeover switch 53-4 are combined, an Rs-fold signal cut υ is inserted, and the R3 signal is non-additively combined so that the R3 signal is inserted into this cut to obtain a composite R signal. Further, the character signal C is inverted by the inverters 72+73, respectively, and the Gl signal +B is passed through the contacts r of the changeover switches 5l-21S1-3.
The G3 (green) and B3 (x#) signals, which have polarities opposite to the G1 signal, are supplied to the changeover switches 53-2 + 83-3, respectively. The 01 signal from the selector switch 53-5 is subtracted by the G3 signal to obtain a G signal with a cut in the period of the character signal C. Similarly, a B signal in which the period of the character signal C is notched is formed from the 81 signal from the changeover switch 53-6 and the B3 signal.

These R, G, and B signals are supplied to the drive circuit 4, and the color cathode ray tube 5 displays red characters based on the NR3 signal on the color television screen based on the B+, Gl, and B+ signals.

In the same way, changeover switches 5l-1 to S+-3 are connected to contact g.
When the changeover switches 5t-1 to $1-3 are closed to the side, green characters are displayed on the color television screen, and when the changeover switches 5t-1 to $1-3 are closed to the contact side, blue characters are displayed on the color television screen.

Next, the display of a monochrome screen will be explained using FIG. 3, but here, the background is assumed to be red.

In this case, the changeover switches 53-1 to 53-6 are closed to the contact side, and the changeover switches 5l-4 to 31-
s is closed to the contact r side. At this time, selector switch 5
t-1-8l-3 is also closed to the contact r side.

In this case, R2 generated in the primary color level setting circuit rl
(Red) Signal only switch 81-4 + 83-
4 to the drive circuit 4, and therefore a red screen is displayed on the color cathode ray tube 5.

When a character signal C is generated from the character generator 6, this character signal C simultaneously turns on the open/close switches 52-1 to 52-3 for that signal period.For this reason, this period R,2*02
+B2 signal is changed over respectively by switch 52-1+82-
Passing 2132-3, R4 (red), G4 (green), B4
(Blue) Selector switch 83-1 + 33-2 as signal
+ Supplied to Sa-・3. Changeover switch 53-4
The R2 signal and the R4 signal are non-additively combined as described above, but since these signals have the same level, they are no different from the R signal HR2 signal obtained by combining.

In addition, since no signals are supplied from the changeover switches 83-5 + 83-s, the G signal and B signal are very similar to G4.
The signal is none other than the B4 signal.

These R, G, and B signals are supplied to the drive circuit 4.

Just in case, open/close switch 52 of color cathode ray tube 5
-1 to 52-3 are turned off, the R2 signal is displayed in red, and the open/close switch 52-3 is turned off.
The portion corresponding to the period in which -1 to 52-3 are on is displayed in white by the R41G41 B4 signal.

Therefore, on the color cathode ray tube 5, white characters are displayed against a red background.

In the same way, changeover switches 81-4 to 51-6 are connected to contact g.
When the switches 51-4 to 51-6 are closed toward the contact side, the background becomes blue.

As is clear from the above explanation, it is possible to change not only the background color of a monochrome screen, but also the color of the text displayed on the television screen. Since characters are displayed in the designated color, if these colors are to be the same, the color designation operation only needs to be performed once, which greatly simplifies the operation.

In the above embodiment, the background and text colors are R, G,
Although the primary color is B, for example, the changeover switch S+-1-
By using a switch having four or more contacts as 8+-s, it is also possible to display a desired mixed color.

〔Effect of the invention〕

As explained above, according to the present invention, when an operation is performed to specify the color of either the characters displayed on the color television screen or the background for the white characters on the monochrome screen,
The other side can always be displayed in this specified color, and the color specification operation when displaying them in the same color is greatly simplified, and the operability is significantly improved. Color display devices can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of a color display device according to the present invention, FIG. 2 is a waveform diagram showing signals of various parts during one operation of this embodiment, and FIG. 6 is another operation of this embodiment. FIG. 1... Luminance signal input terminal 2... Color signal input terminal 5... Matrix circuit 4.
...Drive circuit 5...Color cathode ray tube 6...
・Character generator

Claims (1)

[Claims] In a color display device capable of selectively displaying characters on a television screen and displaying white characters on a monochrome background, the colors are switched in conjunction with each other as a color specification operation is performed. and first and second color switching means for setting the same color to each other, and the first color switching means switches the color of the characters displayed on the television screen, and the second color switching means switches the color of the characters displayed on the television screen; By switching the color of the monochrome background using the color switching means, the characters displayed on the television screen and the monochrome background can always be set to the same color. color display device.