JPS6042675B2 - television screen display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television screen display device, which is a device for displaying information on the screen of a television receiver. It is designed so that it can be displayed.

Generally, cathode ray tube display devices are currently used in a wide variety of fields of education and entertainment.

Usually, as shown in FIG. 1, a device 12 for displaying information is connected to a television receiver 11, and a predetermined pattern 13 is displayed on the screen. The pattern on the screen is changed to a desired state by controlling an operation panel 14, such as a keyboard, attached to the information display device 12. In such devices, a color cathode ray tube or a monochrome cathode ray tube is used in the television receiver, but the video signal in the case of color display includes a luminance signal and a color signal, so it cannot be displayed on the screen. The ivy pattern shape can be distinguished by color, making it easier to see.

However, when the above-mentioned video signal is displayed on a monochrome cathode ray tube, it is displayed only in shades of white and black on the screen, so there is a drawback that it is difficult to distinguish the pattern shape when looking at the screen.

For example, in FIG. 1, if the background is represented by a frame of green G on the screen of a color television receiver, and three color bands of red R1 blue B1 yellow Y are displayed within the frame, if this is a color television receiver, Very easy to identify. However, when displayed on a black and white television receiver screen, green G1 red R1 blue B
1 appear with similar brightness, making it difficult to distinguish the pattern on the screen. The present invention addresses the above-mentioned problems, and provides a television screen that makes it easy to distinguish the pattern and shape of the screen and allows clear patterns to be displayed regardless of whether it is displayed using a color cathode ray tube or a black and white cathode ray tube. The present invention provides a display device. The present invention will be explained below with reference to FIGS. 2 to 4.

FIG. 2 shows a video signal generation circuit within the display device 12 for displaying information on a television receiver.

In FIG. 2, the dashed-dotted line frame 15 is a brightness adjustment circuit which is the most characteristic feature of the present invention. In FIG. 2, a decoder 16 generates reference signals for obtaining luminance signals and various color signals from data created by a microcomputer, etc., and is connected to each terminal 17, 18, 19, and 20 as shown in FIG. As shown, luminance signal a1 yellow code signal b,
A red code signal c and a blue code signal d are obtained.

These terminals 17 to 20 are connected to gate circuits 21 and 22, respectively.
, 23, 24.

Further, a color subcarrier signal (3.58 MHz) is applied to the terminal 26, and this terminal is connected to the phase circuits 27, 28, 29, respectively.
, 30 and the gate circuit 25. A burst gate signal is applied to this gate circuit 25 from a terminal 34, and each of the gate circuits 21, 22, 23, 24, 2
5 are connected to a first mixer 31, and the output of this first mixer 31 is connected to a second mixer 32.
It is connected to the. The luminance signal a and a synchronization signal from a terminal 33 are applied to this second mixer 32 . Incidentally, the dash-dotted line frame portion 15 will be described later, and the operation of the circuit described above will be explained with reference to FIG.

Luminance signal a and yellow code signal b from the decoder 16
, red code signal C1 blue code signal d is gate circuit 2
1, 22, 23, 24, while the 3.58 MHz signal from terminal 26 is applied to phase circuits 27, 28, 29, 3.
0 to each phase of green (background color), yellow, red, and blue, and gate circuits 21, 22, 23, and 24 extract signals of each hue. Further, the 3.58 MHz signal from the terminal 26 and the burst gate signal (FIG. 3e) from the terminal 34 are applied to the gate circuit 25, and the burst signal is taken out from the output. Each of these gate circuits 21, 22
, 23, 24, 25 are applied to the first mixer 31. A color signal as shown by h in FIG. 3 is obtained from this first mixer 31. This color signal h is combined with the luminance signal a1 and the synchronization signal 1 in the next second mixer 32, and the video signal j is obtained from the output terminal 35.

Looking at this video signal j, the brightness level is the background color (green)
It can be seen that the levels are the same except for the part. This signal j
The desired display can be achieved by RF modulating the signal and adding it to the input terminal (antenna input terminal) of the television receiver.However, although it is clearly expressed in color television receivers, the above-mentioned It is not clearly expressed as such. In particular, when displaying pictures on a cathode ray tube display, or when two people compete by displaying a variety of patterns, such as on a video game device, it is difficult to make clear decisions using black and white patterns, so black and white television displays are used. I had become unsuitable for it.

The present invention provides a brightness adjustment circuit 15 in FIG.
The video signal shown in j of FIG. 3 is given a luminance change so that the luminance level is made different for each color as shown in k of FIG. 3.

In this example, blue has the highest level, followed by red, yellow, and
Sorted by color. By changing the brightness in this way, there will be a difference in brightness even on a black and white television screen, so the shape of the pattern can be clearly determined. Now, FIG. 4 will be described in detail regarding the brightness adjustment circuit 15.

That is, gate signals F and g having opposite polarities to the red and blue code signals C and d shown in FIG. 3 are obtained from the terminals 36 and 37 of the decoder 16, respectively, and the luminance signal is This means that it changes the

The brightness adjustment circuit 15 has a level setting circuit 38, which, as shown in FIG. The signals F and g are respectively added to . The other parts in FIG. 4 constitute the second mixer 32 in FIG. , resistor 44 and diode 54
It has a series circuit of a resistor 43 and a diode 53, and a capacitor 39 is connected to this point A, and the base of an emitter follower transistor 40 is also connected to this point A. The collector of this transistor 40 is connected to the +B power supply, and the emitter is connected to the output terminal 35.
and is grounded via a resistor 57. Note that the other ends of the resistors 44, 43 and the capacitor 39 are connected to terminals 17, 3.
3 and 60, and a luminance signal a, a synchronization signal, and a color signal h are applied to these terminals, respectively. Next, the operation of the circuit shown in FIG. 4 will be explained.

If the values of the resistors 41, 42, 43, 44, 45, and 46 are Rl, R2, R3, R4, R5, and R6, then when the yellow pattern is displayed first, the values shown in Figure 3b
This corresponds to a period in which the signal 1 is at a high level, and the signal shown in FIG. Similarly, the synchronizing signal shown in FIG. 3, which is applied to the terminal 33, is at a high level during this period, and the diode 53 is also turned on. on the other hand,
The signals applied to terminals 36 and 37 are as shown in FIG. 3F and g. Since the period is at high level, the diode 55,5
6 are all reverse biased and turned off. Therefore, the brightness level of the yellow pattern is determined by the resistors Rl, R2, R3, and R4.
For example, it is determined by the value of k in FIG. 3, level 1. The next time the red pattern appears, see Figure 3c.
This corresponds to a period in which the signal 3 is at a high level, and the signal shown in FIG.

On the other hand, since the signal shown in FIG. 3A applied to the terminal 17 is at a high level during this period, the diode 54 is turned on, and the signal shown in FIG. 3G applied to the terminal 37 is at a high level during this period, so the diode 56 is reverse biased Then it turns off.
Therefore, the brightness level of the red pattern is determined by the resistances Rl, R2,
It is set by the values of R3, R4, and R5, and is determined, for example, at the KOm level in FIG. Furthermore, when a blue pattern is displayed, this corresponds to a period in which the signal d in Figure 3 is at a high level, and the signal in Figure 3 g applied to the terminal 37 is at a low level during this period, so the diode 56 is on. 53
is turned on as described above.

On the other hand, the signal shown in FIG.
Since the signal of FIG. 3f applied to the diode 6 is at a high level during this period, the diode 55 is reverse biased and turned off. Therefore, the brightness level of the blue pattern is determined by the resistances Rl, R2, R
3, R4, and R6, for example, Fig. 3 k.
(7) Determined to be n level. Note that Rl, R2, and R3 are set to fixed values to determine the level of the synchronization signal, so the brightness level of yellow is determined by resistor R4, the brightness level of red is determined by resistors R4 and R5, and the brightness level of blue is determined by resistors R4 and R6. It turns out.

Therefore, by selecting these R4, R5, and R6, it becomes possible to provide a change in brightness for each color pattern. Incidentally, the resistance values, R5, and R6 may be changed by variable resistors. As explained above, according to the present invention, it has become possible to clearly display and distinguish images on both black-and-white television display and color television display using a simple circuit consisting of diodes and resistors.

Furthermore, since there is a difference in brightness even when the image is received by a color television receiver, the resolution in the horizontal direction is also improved, making it possible to display even complex images.

[Brief explanation of drawings]

Fig. 1 is a front view showing the general configuration of a television screen display device, Fig. 2 is a circuit diagram for displaying information on a television screen according to the present invention, and Fig. 3 is for explaining the circuit operation of Fig. 2. FIG. 4 is a circuit diagram of the main part of the present invention. 15... Brightness adjustment circuit, 43-46... Resistor,
53-56...Diode.

Claims (1)

[Claims] 1. A signal supply means for outputting a luminance signal to be displayed and a plurality of types of color signals, a first mixing circuit for mixing the respective color signals obtained by the signal supply means, and gate signal generating means for generating first and second gate signals corresponding to at least first and second color portions of the color signal; and first and second gate signals from the gate signal generating means; are applied respectively.
and a second input terminal, and third and fourth input terminals to which a luminance signal from the signal supply means and a synchronization signal having a predetermined DC level during a scanning period are applied, respectively; a second mixing circuit having a fifth input terminal to which the output of the first mixing circuit is applied, and a first resistor superimposing the signals input to the first to fifth input terminals; The second mixing circuit includes a second resistor connected in series between the first resistor and the first input terminal, and a first diode that becomes conductive when the first gate signal is applied. a first level setting circuit; and a third level setting circuit connected in series between the first resistor and the second input terminal.
a second level setting circuit comprising a resistor and a second diode that becomes conductive when the second gate signal is applied, and the second resistor and the third resistor have different values. , regardless of the level of the color signal applied to the fifth input terminal of the second mixing circuit, signals with different DC reproduction levels corresponding to reproduced colors are taken out from both ends of the first resistor. A television screen display device characterized by: