JPH11136594A - Multi-screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a stable multi-screen without using any new circuit constitution. SOLUTION: The TV signals sent from an antenna 1 are supplied to the receiving circuits 2 and 5 and then supplied to the decoder circuits 4 and 7 via the demodulation circuits 3 and 6. Then the luminance signals, the U/V axial signals and the vertical/horizontal synchronizing signals are taken out at both circuits 4 and 7 and then supplied to a multi-screen forming circuit 8 including a memory. Meanwhile, the luminance and chroma signals sent from the circuit 3 are supplied to a deflection drive circuit 9, and the synchronizing signals sent from the circuit 9 are supplied to the circuit 8 to produce the video signals of a multi-screen. These video signals are supplied to an image receiving tube 12 via an output circuit 11. The synchronizing signals are also supplied to a deflecting coil 13 from the circuit 9. Furthermore, the circuit 9 can freely run when it receives no input and a switch 14 functions to cut off the input of the circuit 9 in a multi-screen mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen device suitable for use, for example, when combining and displaying television screens of a plurality of channels.

[0002]

2. Description of the Related Art For example, when it is desired to know the program contents of another channel broadcast in parallel, a so-called picture-in-picture method has been conventionally used.

That is, in FIG. 2, a signal from an antenna 51 is supplied to a first receiving circuit 52, and a television signal of a desired channel is received. The television signal received by the receiving circuit 52 is supplied to a demodulation circuit 53, where a luminance signal Y and a chroma signal C are demodulated. These signals are supplied to a decoder circuit 54, and the luminance signal Y and the U-axis , V-axis signals are extracted.

The luminance signal Y and the U-axis and V-axis signals are supplied to an output circuit 58 through changeover switches 55, 56 and 57, and the three primary color signals (R / G / B) from the output circuit 58 are output. It is supplied to the picture tube 59. Further, for example, a vertical / horizontal synchronization signal (V / H) extracted from the decoder circuit 54 is passed through the deflection driving circuit 60 to the picture tube 59.
Is supplied to the deflection coil 61.

Further, a signal from the antenna 51 is supplied to a second receiving circuit 62, and a television signal of a desired channel is received. The television signal received by the receiving circuit 62 is supplied to a demodulation circuit 63, where a luminance signal Y and a chroma signal C are demodulated. These signals are supplied to a decoder circuit 64, and the luminance signal Y and the U-axis , V-axis signals are extracted.

The luminance signal Y and the signals of the U and V axes are supplied to a memory circuit 65. Further, for example, a vertical / horizontal synchronization signal (V
/ H) is supplied to the memory circuit 65. by this,
In accordance with these synchronization signals, the luminance signal Y from the decoder circuit 64 and the U-axis and V-axis signals are written to the memory circuit 65.

Further, a synchronizing signal extracted from the above-described decoder circuit 54 is supplied to a control circuit 66. Then, a control signal from the control circuit 66 is supplied to the memory circuit 65, and a signal written at a predetermined timing is read. Further, these signals are provided by the changeover switches 55 to 55.
The switches 55 to 57 are switched by a control signal from the control circuit 66.

As a result, for example, as shown in the figure, the signal received by the second receiving circuit 62 is located at a predetermined position in the parent screen 67 based on the image of the television signal received by the first receiving circuit 52. A child screen 68 of a television signal image is displayed. The display position of the child screen 68 is
The position can be arbitrarily changed to, for example, a position indicated by a broken line under the control of the control circuit 66.

However, in such a picture-in-picture method, it is difficult to display, for example, television signal images of two channels in equal sizes. Further, for example, when it is desired to view the broadcasted programs of the respective channels, it is not possible to display television signal images of those channels on a so-called multi-screen.

On the other hand, the above-mentioned signal of the main screen 67 is also processed by using a memory, so that the two-channel television signal images can be displayed in an equal size, or the multi-screen can be displayed. A method of displaying an image of a television signal of three or more channels has been proposed. That is, FIG. 3 is a block diagram showing the configuration of such a conventional multi-screen device.

In FIG. 3, a signal from an antenna 71 is supplied to a first receiving circuit 72, and a television signal of a desired channel is received. The television signal received by the receiving circuit 72 is supplied to a demodulation circuit 73, where a luminance signal Y and a chroma signal C are demodulated. These signals are supplied to a decoder circuit 74, and the luminance signal Y and the U-axis , V-axis signals and vertical / horizontal synchronization signals (V / H) are extracted.

A signal from the antenna 71 is supplied to a second receiving circuit 75, and a television signal of a desired channel is received. The television signal received by the receiving circuit 75 is supplied to a demodulation circuit 76, where the luminance signal Y and the chroma signal C are demodulated. These signals are supplied to a decoder circuit 77, and the luminance signal Y and the U-axis , V-axis signals and vertical / horizontal synchronization signals (V / H) are extracted.

Further, these decoder circuits 74 and 77
From the multi-screen forming circuit 78 including the memory
Supplied to Accordingly, in the multi-screen forming circuit 78, each of the luminance signal Y and the signals of the U axis and the V axis are
The data is written to a predetermined address according to a vertical / horizontal synchronization signal (V / H) from each of the decoder circuits 74 and 77.

On the other hand, the luminance signal Y and the chroma signal C from the demodulation circuit 73 are supplied to the deflection driving circuit 79, and the vertical / horizontal synchronization signal (V / H) of the television signal received by the first receiving circuit 72 is supplied. H) is taken out. Then, these synchronizing signals (V / H) are supplied to a multi-screen forming circuit 78, which forms a signal for displaying, for example, two-channel television signal images of equal size as shown in FIG. Is done.

That is, a control signal from the control circuit 80 is further supplied to the multi-screen forming circuit 78.
Then, the addresses where the luminance signals Y and the U-axis and V-axis signals from the decoder circuits 74 and 77 are written are read at the timing of the screens 91 and 92 shown in FIG. Is formed. In the screens 93 and 94 in the figure, for example, a plain signal is inserted.

Further, a video signal formed by the multi-screen forming circuit 78 is supplied to an output circuit 81, and three primary color signals (R / G / B) from the output circuit 81 are supplied to a picture tube 82. A vertical / horizontal synchronization signal (V / H) extracted from the above-described deflection driving circuit 79 is supplied to the deflection coil 83 of the picture tube 82. As a result, the combined multi-screen of the above-mentioned screens 91 to 94 becomes a picture tube 82
Will be displayed.

Alternatively, the above-described apparatus can display a multi-screen as shown in, for example, B or C of FIG. That is, FIG. 4B shows a screen obtained by dividing the screen into nine equal parts. In this case, for example, a video signal from the decoder circuit 74 is displayed as a moving image on the central screen 95 and a surrounding screen 96 is displayed on the central screen 95. For example, by switching the second receiving circuit 75 in order, it is possible to sequentially display the images of the eight channels as still images.

FIG. 4C shows a screen 97 having a quarter area at the center of the screen and a small screen 98 provided around the screen 97. In this case, for example, the center screen 97 has a decoder circuit. The video signal from 74 can be displayed as a moving image, and the surrounding screen 98 can sequentially display, for example, the images of the 12 channels as still images by sequentially switching the second receiving circuit 75.

However, when multi-screen display is performed by the above-described apparatus, for example, when a channel is switched or the broadcast ends, the television signal of the channel received by the first receiving circuit 72 becomes blank. Alternatively, when a channel having a weak electric field is received, the vertical / horizontal synchronization signal (V / H) may not be normally taken out by the deflection driving circuit 79 in some cases.

In this case, in the above-described apparatus, a normal synchronizing signal (V / H) is not supplied to the multi-screen forming circuit 78, and a good multi-screen cannot be formed. For this reason, in the conventional apparatus, when the television signal of the channel received by the first receiving circuit 72 becomes non-signal at the time of channel switching or the like, the display of the picture tube is turned off and the distorted screen is displayed. I was trying not to.

However, in the above-described apparatus, for example, when the image of the channel received by the first receiving circuit 72 is displayed on the right screen 91 on the screen of FIG. When the signal of the picture becomes a no signal, the display of the picture tube is once turned off and then a disturbed screen due to the no signal is displayed. The display on the picture tube is not erased only by being displayed, and the display on the screen 91 can be seen.

That is, in this case, there is a superior difference between the screen 91 and the screen 92 which are displayed in equal sizes on the multi-screen. However, it is extremely difficult for a user to understand the existence of such a superior difference. As a result, there is a great possibility that the user may be misunderstood as a failure or the like.

In the above-described apparatus, in the screens of FIGS. 4B and 4C, when the signal of the channel displayed on the central screens 95 and 97 becomes no signal, the display of the picture tube is once turned off and then turned off. Will be displayed, but it is unreasonable that the surrounding screens 96 and 98 are frequently erased when the channels displayed on the center screens 95 and 97 are switched, for example. It is highly likely that the user will be misunderstood as a failure or the like.

Therefore, in order to eliminate such a situation where the display is turned off and to eliminate disturbance of the entire display when there is no signal / weak electric field, an apparatus shown in FIG. 5 has been proposed. That is, in FIG. 5, a synchronization generation circuit 84 is provided. The horizontal synchronizing signal (H) from the synchronizing circuit 84 and the horizontal synchronizing signal (H) from the deflection driving circuit 79 are switched by the switch 85 and supplied to the multi-screen forming circuit 78. The rest is configured similarly to FIG.

Therefore, in the apparatus shown in FIG. 5, for example, when a multi-screen is formed, the changeover switch 85 is switched to the synchronization generating circuit 84, so that the multi-screen forming circuit 78 receives the data by the first receiving circuit 72, for example. A stable synchronizing signal is always supplied irrespective of the presence or absence of a channel signal, and a good multi-screen video signal can always be formed using this stable synchronizing signal.

However, in this device, a new synchronization generating circuit 84 is required. Such a synchronization generation circuit 84 requires an oscillator that performs stable oscillation at a predetermined frequency and a circuit configuration for forming a predetermined synchronization signal waveform. Are required and cannot be easily realized.

[0027]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the problem to be solved is that the screen is disturbed when forming a multi-screen in the conventional apparatus. There is a possibility that if the display is turned off to hide this, the user may be misunderstood as a failure or the like, and additional circuit configuration is required to form a multi-screen stably. is there.

[0028]

Therefore, in the present invention, the driving means is constituted so as to be capable of self-running when there is no input signal, and reads out the multi-screen forming circuit in accordance with a synchronization signal from the driving means. At the same time, means for interrupting the input signal of the driving means is provided when displaying a multi-screen, and according to this, a stable multi-screen is formed without using a new circuit configuration. be able to.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the present invention comprises driving means for driving a display means for displaying at least a video signal by separating a synchronization signal of a video signal from one video signal source,
A multi-screen that writes video signals from a plurality of video signal sources to a multi-screen forming circuit according to their own synchronization signals, reads the multi-screen forming circuit, and obtains a multi-screen by combining video signals from a plurality of video signal sources into one. In the screen device, the driving unit is configured to be capable of self-running when there is no input signal, and reads out the multi-screen forming circuit in accordance with a synchronization signal from the driving unit. Means for interrupting the input signal.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an example of a multi-screen device to which the present invention is applied.

In FIG. 1, a signal from an antenna 1 is supplied to a first receiving circuit 2, and a television signal of a desired channel is received. The television signal received by the receiving circuit 2 is supplied to a demodulation circuit 3, where a luminance signal Y and a chroma signal C are demodulated. These signals are supplied to a decoder circuit 4, and the luminance signal Y and the U-axis , V-axis signals and vertical / horizontal synchronization signals (V / H) are extracted.

Further, a signal from the antenna 1 is supplied to a second receiving circuit 5, and a television signal of a desired channel is received. The television signal received by the receiving circuit 5 is supplied to a demodulation circuit 6 where the luminance signal Y and the chroma signal C are demodulated.
To extract the luminance signal Y, U-axis and V-axis signals, and vertical / horizontal synchronization signals (V / H).

Further, signals from the decoder circuits 4 and 7 are supplied to a multi-screen forming circuit 8 including a memory. As a result, in the multi-screen forming circuit 8, the respective luminance signals Y and the U-axis and V-axis signals are converted into vertical / horizontal synchronization signals (V) from the respective decoder circuits 4 and 7.
/ H) at a predetermined address.

On the other hand, the luminance signal Y and the chroma signal C from the demodulation circuit 3 are supplied to the deflection driving circuit 9, and the vertical / horizontal synchronization signal (V / H) of the television signal received by the first receiving circuit 2 is supplied. H) is taken out. Then, these synchronization signals (V / H) are supplied to the multi-screen forming circuit 8 to form a video signal for displaying a multi-screen as shown in FIG. 4, for example.

That is, in the multi-screen forming circuit 8,
Further, a control signal from the control circuit 10 is supplied. Then, the luminance signals Y from the decoder circuits 4 and 7 and the U axis and V
By reading the address where the axis signal is written at a predetermined timing, a video signal for displaying a screen as shown in FIG. 4 is formed.

Further, the video signal formed by the multi-screen forming circuit 8 is supplied to an output circuit 11, and the three primary color signals (R / G / B) from the output circuit 11 are supplied to a picture tube 12. A vertical / horizontal synchronization signal (V / H) extracted from the above-described deflection driving circuit 9 is supplied to the deflection coil 13 of the picture tube 12. Thus, the above-described multi-screen is displayed on the picture tube 12.

Further, in this apparatus, the above-mentioned deflection driving circuit 9 is configured to be able to run on its own when there is no input signal, and the input signal of the deflection driving circuit 9 is displayed when displaying a multi-screen. Switch 14 is provided so as to shut off the power supply. That is, the switch 14 is provided on the supply line of the luminance signal Y from the demodulation circuit 3, and the switch 14 is turned off by the signal indicating the multi-screen from the control circuit 10.

As described above, in this apparatus, when displaying a multi-screen, the input signal of the deflection driving circuit 9 is set to the switch 1
4, the deflection drive circuit 9 forms a vertical / horizontal synchronizing signal (V / H) by self-running. The synchronizing signal is supplied to the multi-screen forming circuit 8 and the deflecting coil 13 of the picture tube 12, whereby a good multi-screen is always displayed on the picture tube 12.

Thus, when the multi-screen is formed, the screen is not disturbed even if the television signal of the channel received by the first receiving circuit 2 becomes a no-signal or a weak electric field. It is not necessary to turn off the display of the picture tube at the time of switching, etc., and the only necessary circuit configuration is to provide one switch 14 on the supply line of the luminance signal Y from the demodulation circuit 3.

Therefore, in this apparatus, the driving means is configured to be able to run on its own in the absence of an input signal, to read out the multi-screen forming circuit in accordance with the synchronization signal from the driving means, and to display the multi-screen when displaying the multi-screen. By providing means for interrupting the input signal of the driving means, it is possible to form a stable multi-screen without using a new circuit configuration.

As a result, in the conventional apparatus, the screen may be disturbed at the time of forming the multi-screen, and if the display is turned off to hide the screen, the user may be misunderstood as a failure or the like. However, according to the present invention, these problems can be easily solved.

In the above-described apparatus, the deflection driving circuit 9
Can be configured to be self-propelled by using, for example, a circuit of product number CXA2025 manufactured by the present applicant. This circuit automatically shifts to the countdown mode when the input signal disappears, and the self-running is performed.

The above-described multi-screen device of the present invention cannot be applied to the conventional picture-in-picture circuit shown in FIG. 2, for example. It is possible to form a screen.

Thus, according to the above-described multi-screen device,
A driving unit that separates a synchronizing signal of the video signal from one video signal source and drives a display unit that displays at least the video signal, and multiplexes the video signals from a plurality of video signal sources according to their own synchronizing signals. In a multi-screen device that writes to the screen forming circuit and reads out the multi-screen forming circuit to obtain a multi-screen by combining video signals from multiple video signal sources into one, the driving means can be self-propelled when there is no input signal And read out the multi-screen forming circuit according to the synchronization signal from the driving means, and provide a means for interrupting the input signal of the driving means when displaying the multi-screen, thereby providing a new circuit configuration. It is possible to form a stable multi-screen without using the image.

[0045]

According to the first aspect of the present invention, the driving means is configured to be capable of self-running when there is no input signal, and the multi-screen forming circuit is read out in accordance with the synchronization signal from the driving means. By providing a means for interrupting the input signal of the driving means when displaying a multi-screen, a stable multi-screen can be formed without using a new circuit configuration.

As a result, in the conventional apparatus, the screen may be disturbed when the multi-screen is formed, and if the display is turned off to hide the screen, the user may be misunderstood as a failure or the like. However, according to the present invention, these problems can be easily solved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a multi-screen device to which the present invention is applied.

FIG. 2 is a configuration diagram of a picture-in-picture circuit.

FIG. 3 is a configuration diagram of a conventional multi-screen device.

FIG. 4 is a diagram for explaining this.

FIG. 5 is a configuration diagram of a conventional multi-screen device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... 1st receiving circuit, 3 ... Demodulation circuit, 4
... decoder circuit, 5 ... second reception circuit, 6 ... demodulation circuit,
7 Decoder circuit, 8 Multi-screen forming circuit, 9 Deflection drive circuit, 10 Control circuit, 11 Output circuit, 12 Picture tube, 13 Deflection coil, 14 Switch

Claims (2)

[Claims] A driving unit that separates a synchronizing signal of a video signal from one video signal source and drives at least a display unit that displays the video signal; A multi-screen device for writing to a multi-screen forming circuit according to their own synchronization signals, reading the multi-screen forming circuit to obtain a multi-screen by combining video signals from the plurality of video signal sources into one, It is configured to be capable of self-running when there is no input signal, and reads out the multi-screen forming circuit according to a synchronization signal from the driving means, and when the multi-screen is displayed, the input signal of the driving means A multi-screen device characterized by comprising means for shutting off. 2. The multi-screen device according to claim 1, wherein a video signal read from said multi-screen forming circuit is displayed on said display means.