JPH10333653A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange image display devices in parallel corresponding to image signals different in configuration without complication an input/output circuit and a signal transfer passage and to make an image at a high degree of freedom expressible. SOLUTION: The image display device is provided with an input means 14, a selecting means 20 and an output means 15. The selecting means 20 selects plural image signal and one signal out of image signals from the outside through the input means 14 to be delivered to a signal processing system and, similarly, plural image signals and one signal out of image signals from the outside through the input means 14 to be sent to the outside, so that prescribed image signals can be supplied to a signal processing system and the outside image display device without complicating an input/output circuit and a signal transfer passage and the image display devices are arranged in parallel to be able to express an image at a high degree of freedom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device capable of displaying a plurality of video signals having different forms, each of which can be displayed, and which is preferably used in a side-by-side arrangement.

[0002]

2. Description of the Related Art In a conventional video display device, there are several video signals of different forms, that is, signals of different standards. For example, in the case of a high-definition television system having 1125 scanning lines and a video signal bandwidth of 20 MHz, a Y (luminance) signal, a Pb (blue color difference) signal,
It is composed of a Pr (red color difference) signal. Further, it is composed of 525 scanning lines and has a video signal bandwidth of 4.2M.
Hz NTSC video signal is recorded and reproduced.
A composite signal including a Y (luminance) signal and a C (color) signal is used. Further, in the case of a personal computer or the like, an RGB signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal is used.

In the presence of a plurality of video signals having different signal forms as described above, for example, a conventional video display apparatus capable of displaying corresponding to each of these video signals is shown in FIG.
Shown in

In FIG. 5, reference numeral 101a denotes a video display device. The high-definition signal is supplied to the receiving circuit 111, the signal via the receiving circuit 111 is supplied to the high-definition signal processing circuit 116, subjected to signal processing based on the control signal from the control circuit 119, and supplied to the switching circuit 131. Further, for example, an NTSC video signal is supplied to the receiving circuit 112, and a signal passed through the receiving circuit 112 is supplied to the video signal processing circuit 117 to control the control circuit 119.
Signal processing based on the control signal from the
1 is supplied. Further, an RGB signal from, for example, a personal computer is supplied to the receiving circuit 113, and a signal via the receiving circuit 113 is supplied to an RGB signal processing circuit 118, where the signal is processed based on a control signal from a control circuit 119, and a switching circuit is provided. 131.

The switching circuit 131 performs a switching operation based on a control signal from the control circuit 119, selects one video signal from a plurality of types of video signals supplied to the switching circuit, and sends the selected video signal to the driving circuit 132. Supply.

In the drive circuit 132, the control circuit 132
A drive signal is formed on the basis of the control signal supplied from the control unit and the video signal supplied via the switching circuit 131. The drive signal is supplied to the display unit 133, and the desired video is displayed on the display unit 133.
Is displayed in.

In recent years, large and thin display devices such as a liquid crystal display and a plasma display have been developed one after another, and a plurality of such display devices have been arranged side by side to use a plurality of display screens. There is a growing demand for video display devices that are capable of expressing video as a whole, and that are capable of expressing video images with a high degree of freedom in response to various uses and of course, various types of video signals having different forms. . For example, FIG. 6 shows a configuration in which three video display devices are arranged side by side in correspondence with each signal using a conventional video display device.

In FIG. 6, reference numeral 107 denotes a personal computer (indicated by a PC in the figure), and reference numeral 108 denotes a MUSE (Multiple Sub-Nyquist-Samplin).
g Encoding) Decoder, indicated by 109 is VC
R (Video Cassette Recorder).

RG from personal computer 107
The B signal is supplied to the dedicated selector 121, and the RGB signal is divided into three by the dedicated selector 121,
The video display devices 101a, 101a
1b and 101c. The high-definition signal from the MUSE decoder 108 is transmitted to the dedicated selector 12
The high-definition signal is supplied to the image selectors 101a, 101b, and 101c via the high-definition signal cable. The video signal from the VCR 109 is supplied to the dedicated selector 123 and the dedicated selector 12
3, the video signal is divided into three, and the video display devices 101a, 101b, and 10 are connected by video signal cables.
1c.

[0010]

However, as described above, in the conventional video display device, when the video display devices are arranged side by side so as to correspond to video signals of different forms, a dedicated selector 121 is provided. , 122 and 1
In addition to the necessity of the device 23, the cost is increased, and the input / output circuit and the signal transmission line are very complicated.
Also, when a dedicated cable is used as the connection line, the cost is similarly increased, and there is a problem that it is very difficult to use in terms of installation work and operability.

Accordingly, it is an object of the present invention to be able to cope with each of video signals of different forms without complicating an input / output circuit and a signal transmission path. It is another object of the present invention to provide a video display device that can easily perform video expression and that can display a video image with a high degree of freedom.

Another object of the present invention is to provide an image display device which can simplify a transmission mechanism and can use mechanical connection lines having a common structure.

[0013]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of video signals having different forms are inputted, and one video signal is selected from the plurality of video signals having different forms. A video display device having video display means for selectively switching and displaying the video signal, an input means provided separately from a plurality of video signal inputs, and a video signal supplied from outside, and a plurality of video signal input and input means And a selection means for selecting and outputting a video signal to the video display means and a video signal to the outside, respectively, and an output means for outputting the video signal from the selection means. An image display device characterized by the following.

According to a second aspect of the present invention, there is provided the video display device further comprising a transmission mechanism for transmitting the video signal from the output means to the external video display device. A third aspect of the present invention is the video display device, wherein the transmission mechanism is wired.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an overall view of an embodiment of the present invention, and FIG. 2 shows a main part in FIG. 1 in detail. Corresponding portions are denoted by the same reference numerals. .

In FIG. 1, reference numeral 1a denotes an image display device. The image display device 1a includes three receiving circuits 1
1, 12, 13, an input circuit 14, an output circuit 15, a selection circuit 20, cables 4, 5a, and the like. For example, as one of video signals having different forms, Y signal, Pb
A Hi-Vision signal composed of a signal and a Pr signal is supplied to the receiving circuit 11. The signal via the reception circuit 11 is supplied to the selection circuit 20.

A video signal of a different form, such as a Y signal and a C signal or a V (composite) signal, for example, an NTSC video signal, is supplied to the receiving circuit 12. The signal via the reception circuit 12 is supplied to the selection circuit 20. Further, for example, R signals, G signals, B signals, HD (horizontal synchronization) signals, and V
An RGB signal composed of a D (vertical synchronization) signal is supplied to the receiving circuit 13. The signal via the reception circuit 13 is supplied to the selection circuit 20.

The cables 4 and 5a have the number of transmission lines requiring the most lines among the video signals of different forms. In this case, it is composed of five lines for video signals and synchronization signals and one line for control signals. The cable 4 is used on the input side and is connected to the input circuit 14 of the video display device 1a. The cable 5 a is used on the output side and is connected to the output circuit 15. Therefore, a signal transmission path with an external video display device is formed by the cables 4 and 5a.

A high-definition signal, a video signal, and an R signal are output from an external video display device through the cable 4 and the input circuit 14.
Any one of the GB signals is supplied to the selection circuit 20. In addition to the video signal, the control signal S1 is supplied to the control circuit 19 via the cable 4, and the control signal S3 is output to the outside. In other words, bidirectional communication with the external control circuit is enabled, and the control signal S
1, S3 is delivered.

As shown in FIG. 2, the selection circuit 20 includes four switch circuits 21, 22, 23, and 24. Each of the switch circuits 21, 22, 23, and 24 includes a control circuit 19 Is supplied, and a switching operation is performed based on the control signal S2.

The four input terminals of the switch circuit 21
A Y signal of a high vision signal, a Y signal of a video signal, a G signal of an RGB signal, and a signal passing through one line of the cable 4 are supplied from the receiving circuits 11, 12, and 13, respectively. One output of the two output terminals of the switch circuit 21 is supplied to the output circuit 15, and the other output is sent to the high-vision signal processing circuit 16 and the video signal processing circuit 1.
7 and the RGB signal processing circuit 18 respectively.

The four input terminals of the switch circuit 22
P of the Hi-Vision signal from the receiving circuits 11, 12, and 13
An r signal, a V signal of a video signal, a B signal of an RGB signal, and a signal passing through one line of the cable 4 are supplied, respectively. One of the two output terminals of the switch circuit 22 is supplied to the output circuit 15, and the other output is supplied to the high-vision signal processing circuit 16 and the video signal processing circuit 1.
7 and the RGB signal processing circuit 18 respectively.

The four input terminals of the switch circuit 23
A Pb signal of a high vision signal, a C signal of a video signal, an R signal of an RGB signal, and a VD signal and an HD signal from the cable 4 are supplied from the receiving circuit 13, respectively. One output of the two output terminals of the switch circuit 23 is supplied to the output circuit 15, and the other output is supplied to each of the high-vision signal processing circuit 16, the video signal processing circuit 17, and the RGB signal processing circuit 18. Is done.

The four input terminals of the switch circuit 24 include:
The VD signal of the RGB signal, the HD signal, the signal of the line of the cable 4, and the signal passing through one line of the cable 4 are supplied from the receiving circuits 11, 12, and 13, respectively.
Also, one set of outputs of the four output terminals of the switch circuit 24 is supplied to the output circuit 15 and the other set of outputs is
The signal is supplied to the signal processing circuit 18.

In the selection circuit 20, a switching operation is performed based on the control signal S2, and the reception circuits 11, 12, 1
One signal to be passed to the signal processing system is selected from the high definition signal, the video signal, the RGB signal from the third side and the external video signal from the input circuit 14, and similarly,
One signal to be sent to the outside separately from the signal processing system is selected from the kinds of video signals.

The signal selected by the selection circuit 20 is supplied to an external video display device via the output circuit 15 and the cable 5a. In addition to the video signal, the control signal S3 is supplied to the control circuit 19 via the cable 5a, and the control signal S3 is output to the outside. That is, bidirectional communication is enabled with the external control circuit, and the control signal S3 is exchanged.

Although not shown, the control circuit 19 controls the control signals according to the state of the operation panel of the video display device 1a and the control signals S1 and S3 from the external control circuit supplied via the cables 4 and 5a. A control signal S2 for selecting a signal for transmission and a signal for display is formed on the basis of the signal processing, and a signal processing corresponding to the selected signal for display is performed by a high-vision signal processing circuit 16, a video signal processing circuit 17, an RGB signal processing. Form control signal S4 as done in circuit 18.

The signal supplied through the selection circuit 20 is
HDTV signal processing circuit 16, video signal processing circuit 1
7 and the RGB signal processing circuit 18 are supplied to any one of the signal processing circuits corresponding to the signal form, subjected to signal processing based on the control signal S4 from the control circuit 19, and supplied to the switching circuit 31.

The switching circuit 31 performs a switching operation based on a control signal from the control circuit 19, and receives a signal from one of the high-vision signal processing circuit 16, the video signal processing circuit 17, and the RGB signal processing circuit 18 from the signal processing circuit. Is supplied to the drive circuit 32.

In the drive circuit 32, a drive signal is formed based on the control signal from the control circuit 19 and the video signal supplied through the switching circuit 31, and the drive signal is supplied to the display unit 33 and The video is displayed on the display unit 33.

FIG. 3 shows an example of a configuration in which three devices serving as signal sources and three video display devices are connected in parallel using the video display device of the above-described embodiment. In FIG. 3, reference numeral 7 denotes a personal computer (indicated by PC in the figure), reference numeral 8 denotes a MUSE decoder, and reference numeral 9 denotes a VCR.

RGB signals from the personal computer 7 are directly supplied to the video display device 1a via an RGB signal cable without passing through an external selector. M
The Hi-Vision signal from the USE decoder 8 is directly supplied to the video display device 1a via the Hi-Vision signal cable without passing through an external selector. A video signal from the VCR 9 is directly supplied to the video display device 1a via a video signal cable without passing through an external selector.

As shown in FIG. 3, each of the video display devices 1a, 1b, and 1c has a common configuration cable 5a for external connection.
5b are connected in parallel. Therefore, one of the HDTV signal, the video signal, and the RGB signal arbitrarily selected by the video display device 1a is transmitted to the video display device 1b via the cable 5a in a relay manner, and further transmitted via the cable 5b. The image data is transmitted to the video display device 1c, subjected to signal processing in each of them, and a predetermined screen is displayed.

FIG. 4 shows an example of a configuration in which three devices serving as signal sources and five video display devices are connected in a loop using the video display device of the above-described embodiment. In FIG. 4, reference numeral 7 denotes a personal computer (indicated by PC in the figure), reference numeral 8 denotes a MUSE decoder, and reference numeral 9 denotes a VCR.

The RGB signals from the personal computer 7 are directly transmitted to the video display device 1 via an RGB signal cable.
a. The Hi-Vision signal from the MUSE decoder 8 is directly supplied to the video display device 1e via the Hi-Vision signal cable. The video signal from the VCR 9 is directly transmitted to the video display device 1c via the video signal cable.
Supplied to

Video display devices 1a, 1b, 1c, 1d, 1
Each of e is loop-connected by cables 5a, 5b, 5c, 5d, 5e having a common configuration for external connection as shown in FIG. Therefore, one of the RGB signal selected by the video display device 1a, the video signal selected by the video display device 1c, or the HDTV signal selected by the video display device 1e is connected to the cable 5a.
The signal is transmitted to each of the video display devices 1a to 1e in a relay manner via the signal sources 5a to 5e, and signal processing is performed in each of them, and a predetermined screen is arbitrarily displayed without being defined at a connection point of the signal source.

In the embodiment of the present invention, a case has been described in which a single video signal is transmitted as a common cable for external transmission. You may comprise. In the case of this other embodiment, since a plurality of video display devices can be controlled in groups in accordance with the number of video signals that can be transmitted, screen display can be performed in group units, and furthermore, the system The degree of freedom in video expression is improved.

In one embodiment of the present invention,
Although the description has been given of the case where the target video signal is a Hi-Vision signal, a video signal, and an RGB signal, the present invention is similarly effective when used for other types of video signals. The same can be applied to the case of input.

[0039]

Therefore, according to the first aspect of the present invention, an input means provided separately from the input of a plurality of video signals, to which the video signals are supplied from the outside, and an input and output means for the plurality of video signals. A video signal supplied from the selector, a video signal to the video display means and a video signal to the outside are selected and output, and an output means for outputting the video signal from the selection means is provided. Therefore, even in the case where a plurality of video display devices are arranged and used in a form corresponding to each of the video signals having different forms, it is possible to easily configure the system without complicating the input / output circuit and the signal transmission path. It is possible, and of course, it is possible to express images with a high degree of freedom in a form having high operability.

According to the second and third aspects of the present invention, there is further provided a transmission mechanism for transmitting the video signal from the output means to the external video display device.
Connection cables can be shared and simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a detailed block diagram of a main part in one embodiment of the present invention.

FIG. 3 is a block diagram showing an example in which the video display devices of the present invention are arranged side by side.

FIG. 4 is a block diagram showing another example in which the video display devices of the present invention are arranged side by side.

FIG. 5 is a block diagram used to describe a conventional video display device.

FIG. 6 is a block diagram showing an example in which conventional video display devices are arranged side by side.

[Explanation of symbols]

1a to 1e: video display device, 4, 5a to 5e ...
Cables, 11, 12, 13, ... receiving circuits, 14 ...
· Input circuit, 15 ··· Output circuit, 16, 17, 18 ·
..Signal processing circuits corresponding to respective video signals, 19 ... control circuits, 20 ... selection circuits, 21, 22, 23, 24
... Switch circuits

Claims (3)

[Claims] 1. A video display apparatus, comprising: a video display unit to which a plurality of video signals having different forms are input and selectively switching and displaying one video signal from the plurality of video signals having the different forms. The input means is provided separately from the input of the video signal, and the video signal is supplied from the outside. The input of the plurality of video signals and the video signal supplied from the input means are supplied to the video display means. A video display device comprising: a selection unit that selects and outputs a video signal and a video signal to the outside, respectively; and an output unit that outputs a video signal from the selection unit. 2. The video display device according to claim 1, further comprising a transmission mechanism for transmitting the video signal from said output means to an external video display device. 3. The video display device according to claim 2, wherein said transmission mechanism is a wire.