JPH1155597A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the video display device that selects and displays one video image among pluralities of video signals with ease of operation even when pluralities of devices processing video signals of different forms are connected in parallel without the need for an exclusive selector and for complicated signal transmission lines. SOLUTION: A video display section 1 and a signal selection section 2 are designed as separate units and a control circuit 19(3) provided to the video display section 1 (signal selection section 2) generates a control signal in response to each state where two-way communication is made available via a cable 6. The control signal is used to control a selection circuit 4 and changeover circuits 11, 12, 13, 21 to select one signal among pluralities of video signals with different forms and a desired video image is displayed on a display section 23.

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, and suitable for connecting a plurality of signal source devices in parallel. .

[0002]

2. Description of the Related Art In a conventional video display device, there are several video signals having different forms, that is, signals having different standards. For example, in the case of a high-definition television system having 1125 scanning lines, it is composed of a Y (luminance) signal, a Pb (blue color difference) signal, and a Pr (red color difference) signal. In the case of an NTSC video signal having 525 scanning lines, a component signal composed of a Y (luminance) signal and a C (color difference) signal and V
A composite signal that is a (video) signal is used.
PAL and SECAM video signals are also NT
The same component signal and composite signal as in the SC system are 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, display can be performed in correspondence with each of these video signals, and a plurality of devices as signal sources are connected in parallel. FIGS. 10 and 11 show examples of connection with a conventional video display device when used in combination.

In FIG. 10, reference numerals 7a and 7b denote personal computers (PCs), and reference numerals 8a and 8b denote MUSE (Multiple Sub-Ny).
A VCR (Vid-Quid-Sampling Encoding) decoder is denoted by 9a and 9b.
eo Cassette Recorder).

[0005] RGB signals are directly supplied from the personal computer 7a to the video display unit 101 via an RGB signal cable. A high-vision signal is supplied from the MUSE decoder 8a to the video display unit 101 via a high-vision signal cable. From VCR9a to NTSC
Is supplied to the video display unit 101 via a video signal cable. In addition, the RGB signal selector 12 converts the RGB signal from the personal computer 7b into a dedicated RGB signal.
1 and an image display unit 101 via an RGB signal cable
Supplied to The high-vision signal is supplied from the MUSE decoder 8b to the video display unit 101 via the dedicated high-vision signal selector 122 and the high-vision signal cable. For example, an NTSC video signal is supplied from the VCR 9b to the video display unit 101 via a dedicated video signal selector 123 and a video signal cable.

FIG. 11 is a block diagram showing the internal functions of the video display unit 101. In the figure, switching circuit 111 has M
The high-vision signal from the USE decoder 8a and the high-vision signal from the high-vision signal selector 122 are supplied, and either one is selected. The signal passed through the switching circuit 111 is supplied to the high-definition signal processing circuit 116, subjected to signal processing, and supplied to the switching circuit 131. Further, the video signal from the VCR 9a and the video signal from the video signal selector 123 are supplied to the switching circuit 112, and either one is selected. The signal that has passed through the switching circuit 112 is supplied to the video signal processing circuit 117, subjected to signal processing, and supplied to the switching circuit 131. Further, the RGB signal from the personal computer 7a and the RGB signal from the RGB signal selector 121 are supplied to the switching circuit 113, and either one is selected. The signal that has passed through the switching circuit 113 is supplied to an RGB signal processing circuit 118, where the signal is processed, and is supplied to the switching circuit 131.

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

In the driving circuit 132, the switching circuit 131
A drive signal corresponding to the video signal supplied via the display unit 133 is formed. The drive signal is supplied to the display unit 133, and a desired video is displayed on the display unit 133.

Recently, large and thin display devices, such as liquid crystal displays and plasma displays, have been developed one after another, and there are applications in which these video display devices are installed on a wall or the like. There is a use for connecting an arbitrary plurality of signal sources to one video display device and appropriately displaying one or more video signals from the connected signal sources in a time-sharing manner without impairing the appearance. There is an increasing demand for a video display device that can be installed on a wall and can cope with various video signals of different forms.

However, as described above, in the conventional video display device, when a plurality of video devices serving as signal sources are connected in parallel and a plurality of video signals of different forms are supplied, a dedicated selector such as RGB is used. The signal selector 121, the high-definition signal selector 122, and the video signal selector 123 are required, which not only increases the cost but also complicates the signal transmission path. In addition, since a plurality of dedicated cables are used as connection lines, there is a problem that not only the cost is increased, but also it is very difficult to handle in installation work. Further, when one video is appropriately displayed from a plurality of different video signals, selection operations are required in the dedicated selector and the video display unit 101, respectively, so that the usability is very poor. there were.

Therefore, as shown in FIG. 12, the video signal is separated into a video display unit 201 and a signal selection unit 202, and all necessary video signals are once input to the signal selection unit 202, and the signal selection unit 202 outputs a desired video signal. An image display device that selects a signal and transmits the signal to the image display unit 201 via the cable 214 is used.

In FIG. 12, RGB signals are directly supplied from a personal computer 7b to a signal selection section 202 of a video display device via an RGB signal cable. From the MUSE decoder 8b of the high-definition television, a high-definition signal is directly supplied to the signal selection unit 202 of the video display device via a high-definition signal cable. VCR9b
For example, an NTSC video signal is supplied directly to the signal selection unit 202 of the video display device via a video signal cable. One of these signals is selected by the selection / transmission circuit 216 in the signal selection unit 202 and transmitted to the reception / drive circuit 213 in the video display unit 201 via the cable 214. The signal received by the receiving / driving circuit 213 is supplied to the display unit 211 and a desired image is displayed on the display unit 21.
1 is displayed. In FIG. 12, a power supply circuit 212 is provided in the video display unit 201, and a power supply circuit 215 is also provided in the signal selection unit 202. One multi-core cable 214 is used only for video signal communication. On the other hand, a power supply circuit may be provided in only one of the video display unit 201 and the signal selection unit 202, and FIG. 13 illustrates a case where the signal selection unit 202 includes the power supply circuit 215. In this case, power is supplied to the video display unit 201 via a cable 217 different from the cable 214 for supplying a video signal.

However, when the video display unit 201 and the signal selection unit 202 each have a power supply circuit, a similar circuit is used.
This is disadvantageous in reducing the size and weight and increasing the cost. If the signal selection unit 202 is provided with a heavy and large-sized power supply circuit to reduce the thickness and weight of the video display unit 201, a cable for supplying power separately from a cable for supplying a video signal And the connection becomes complicated. In addition, when the power is supplied, the power supply from the power supply circuit is suddenly interrupted due to disconnection or oblique insertion of the cable, and an abnormal voltage is generated on the display unit 211. There is a problem that this may cause a failure, the usability is very poor, and the power supply is large, so that the cable cannot be lengthened in terms of safety.

On the other hand, in recent years, large and thin image display devices such as a liquid crystal display and a plasma display have been developed one after another, and there is a use for hanging these image display devices on a wall or the like. In addition, there is a purpose of connecting an arbitrary plurality of signal sources to one image display device and appropriately displaying one image from the connected signal source, and can be installed on a wall without impairing the appearance. Can,
Needless to say, there is an increasing demand for a video display device that can handle various video signals having different forms.

[0015]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can cope with video signals of different forms without complicating the signal transmission path. In addition, when a plurality of devices serving as signal sources are connected in parallel and a plurality of video signals of different forms are supplied, the installation work is facilitated, and the operation is also facilitated when appropriately displaying one video. An image display device is provided.

[0016]

In order to achieve the above-mentioned object, a video display device according to the present invention is provided with a plurality of video signals having different forms and receives at least one of these video signals. In a video display device adapted to display, a video display means corresponding to a plurality of video signals of different forms, and a plurality of video signals of different forms are supplied, and selection means for outputting at least one video signal as selectable. A transmission mechanism for transmitting at least one video signal selected by the selection means to the video display means, wherein the video display means and the selection means exchange control signals by two-way communication to display a video signal. Control means for controlling the functions of the means and the selection means.

Further, the above-mentioned transmission mechanism has a detection mechanism for detecting a connection state between the image display means and the transmission mechanism and a connection state between the selection means and the transmission mechanism.

In the video display apparatus of the present invention, first, a desired video signal is selected from a plurality of video signals by the selection means. Therefore, a control signal is issued by the control means provided in the selection means and the video display means so as to form a circuit configuration corresponding to the selected video signal inside the selection means and the video display means, and this controls the internal functions. Thus, a desired signal is selected from video signals of different forms and can be displayed. In addition, the selected video signal can be transmitted from the selection means to the video display means using, for example, a multi-core cable or the like. If there is a failure in the connection state of the transmission mechanism connecting the two, the failure is immediately detected. Then, the safety circuit of the image display device is operated to protect the device.

When the video signal is accompanied by an audio signal like a television signal, the above-mentioned video signal means a signal including the audio signal.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, and FIGS. 3 and 4 show a main part of FIG. 1 in detail. FIG. 2 shows a connection example in which a plurality of devices as signal sources are connected in parallel to the video display unit according to the present invention, and the corresponding portions in FIGS. Are attached.

In FIG. 1, a video display unit 1 includes four switching circuits 11, 12, 13, 21;
7, a video signal processing unit including a control circuit 19, a receiving circuit 20, and the like, a display unit 23, and a power supply circuit 24. Further, a signal selection unit 2 is provided separately from the video display unit 1, and the signal selection unit 2 includes a control circuit 3, a selection circuit 4, a transmission circuit 5, and a DC-DC converter 26 for supplying predetermined internal power. In addition, it is possible to input a plurality of video signals having different forms, respectively. Video display unit 1
And the signal selector 2 are connected by a cable 6.

As shown in FIG. 2, for example, a personal computer 7a, a MUSE decoder 8
a and the VCR 9a are connected to each other. The signal selection unit 2 is connected to a personal computer 7b, a MUSE decoder 8b, and a VCR 9b.

The MUSE decoder 8b supplies the selection circuit 4 with a high vision signal composed of a Y signal, a Pb signal, and a Pr signal as one of the video signals having different forms. Further, a video signal of a Y signal and a C signal or a V (composite) signal is supplied to the selection circuit 4 from the VCR 9b. Further, from the personal computer 7b, R
Signal, G signal, B signal, HD (horizontal synchronization) signal, and VD
RGB signals composed of (vertical synchronization) signals are supplied to the selection circuit 4.

As an example, as shown in FIG. 3, the selection circuit 4 includes four-input one-output switch circuits 41, 42, 43 and 2
It is composed of a total of five switch circuits including switch circuits 44 and 45 having one input and one output. Switch circuits 41, 4
A control signal from the control circuit 3 is supplied to each of 2, 43, 44, and 45, and a switching operation is performed based on the control signal.

The three input terminals of the switch circuit 41 include:
A Y signal of a high vision signal from the MUSE decoder 8b, a Y signal of a video signal from the VCR 9b, and a G signal from the personal computer 7b are supplied, respectively, and the remaining input terminals are connected to a reference potential, for example, a ground level (hereinafter, GN).
D). The output of the switch circuit 41 is supplied to the transmission circuit 5.

The three input terminals of the switch circuit 42
A Pb signal of a high vision signal from the MUSE decoder 8b, a V signal of a video signal from the VCR 9b, and a B signal from the personal computer 7b are supplied, respectively, and the remaining input terminals are connected to GND. Switch circuit 4
2 is supplied to the transmission circuit 5.

The three input terminals of the switch circuit 43
A Pr signal of a high vision signal from the MUSE decoder 8b, a C signal of a video signal from the VCR 9b, and an R signal from the personal computer 7b are supplied, respectively, and the remaining input terminals are connected to GND. Switch circuit 4
The output of 3 is supplied to the transmission circuit 5.

One input terminal of the switch circuit 44 has
An HD signal is supplied from the personal computer 7b, and the other input terminal is connected to GND. The output of the switch circuit 44 is supplied to the transmission circuit 5. The VD signal from the personal computer 7b is supplied to one input terminal of the switch circuit 45, and the other input terminal is connected to GND. The output of the switch circuit 45 is supplied to the transmission circuit 5.

By the way, as shown in FIG.
And 19 can be bidirectionally communicated via the cable 6, and control signals are exchanged between the control circuit 3 and the control circuit 19. Therefore, the control circuit 3
Although not shown, a control signal based on a control signal according to the state of the operation panel of the video display device or a control signal from the control circuit 19 of the video display unit 1 supplied via the cable 6 is output. Form.

In the selection circuit 4, a switch operation is performed based on a control signal from the control circuit 3, and the MUSE decoder 8b, VCR 9b, personal computer 7b
One of the video signals is selected from the high-vision signal, video signal, and RGB signal from the side, and is sent to the video display unit 1 or is connected to GND.

Transmission of a video signal from the signal selection unit 2 to the video display unit 1 is performed by a transmission circuit 5, a reception circuit 20, and a cable 6 connecting the circuit. In the present embodiment, as shown in FIG. 3, the cable 6 is composed of five lines (shown in FIG. 3) for a video signal and a synchronization signal. Furthermore, there is a method of transmitting a signal in the form of a differential signal in order to prevent noise interference during cable transmission. An example of the basic circuit is shown in the block diagram of FIG. In FIG. 5, the transmission circuit 5 includes an inversion buffer 31 and a non-inversion buffer 3.
2 is transmitted in the form of a differential signal, a twisted pair wire 34 is used for a cable for this signal, and an amplifier 33 for returning the differential signal to the original signal is used in the receiving circuit 20. I have. A circuit block as shown in FIG. 5 is required for the transmission and reception signals. Therefore, in FIG. 3, the lines (1) to (3) are the twisted pair wires 3 as shown in FIG.
The use of the signal transmission / reception circuit constituted by 4 makes it possible to construct a signal transmission mechanism having good anti-noise interference characteristics. Note that a bidirectional communication path (not shown) for transferring control signals between the control circuit 3 and the control circuit 19 is also provided in the cable 6. When the cable 6 is installed over a long distance, a communication means using a three-wire bus may be used in order to ensure this communication. Further, the above-mentioned video signal and control signal can be digitized and digital multiplex transmission means can be used. At this time, an optical fiber may be used for the cable 6.

In FIG. 3, the output of the switch circuit 41 is supplied to the receiving circuit 20 via the line of the transmission circuit 5 and the cable 6, and the output of the switch circuit 42 is supplied via the line of the transmission circuit 5 and the cable 6. The output of the switch circuit 43 is supplied to the reception circuit 20 via the transmission circuit 5 and the cable 6 line, and the output of the switch circuit 44 is supplied to the reception circuit 20 via the transmission circuit 5 and the cable 6 line. The output of the switch circuit 45 is supplied to the reception circuit 20 via the transmission circuit 5 and the cable 6. That is,
In the line of the cable 6, the Y of the MUSE decoder 8b is connected.
Signal, Y signal of VCR 9b, personal computer 7
The G signal of b is transmitted or set to GND (in this case, described as Y / Y / G / GND, and the other lines to are similarly described). Line is (Pb
/ V / B / GND) and the line is (Pr / C / R)
/ GND), the line is (HD / GND), and the line is (VD / GND). Receiving circuit 2
The output of 0 is supplied to each of the switching circuits 11, 12, and 13.

As shown in FIG. 4, the switching circuit 11 is supplied with the high-vision signal from the MUSE decoder 8a and the signal from the signal selecting section 2.
2, the video signal from the VCR 9a and the signal from the signal selection unit 2 are supplied, and further, the switching circuit 13 is supplied with the RGB signal from the personal computer 7a and the signal from the signal selection unit 2.

Each of the switching circuits 11, 12, and 13 is supplied with a control signal from the control circuit 19, and a switching operation is performed based on the control signal. Control circuit 19
Although not shown, a predetermined video signal based on a control signal according to the state of the operation panel of the video display device or a control signal from the control circuit 3 of the signal selection unit 2 supplied via the cable 6 Is formed, and a control signal is formed so that signal processing corresponding to the selected signal is performed in the high-vision signal processing circuit 16, the video signal processing circuit 17, and the RGB signal processing circuit 18.

Therefore, in the switching circuit 11, MUSE
Either the HDTV signal from the decoder 8a or the signal from the signal selector 2 is selected. Switching circuit 11
Are supplied to the HDTV signal processing circuit 16 for signal processing, and are supplied to the switching circuit 21. Also,
In the switching circuit 12, one of the video signal from the VCR 9a and the signal from the signal selection unit 2 is selected. The signal passed through the switching circuit 12 is the video signal processing circuit 1
The signal is supplied to the switching circuit 21 for signal processing. Further, the switching circuit 13 selects one of the RGB signal from the personal computer 7a and the signal from the signal selection unit 2. The signal via the switching circuit 13 is supplied to the RGB signal processing circuit 18 for signal processing, and then supplied to the switching circuit 21.

The switching circuit 21 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. The signal is supplied to the drive circuit 22.

In the driving circuit 22, a driving signal corresponding to the video signal supplied through the switching circuit 21 is formed.
The drive signal is supplied to the display unit 23, and a desired image is displayed on the display unit 23.

As a power source for the video display unit 1 and the signal selection unit 2, a conventional method of receiving power from an external AC power source and internally generating a predetermined power source can be used. In this embodiment, the power supply circuit 24 is provided in the video display unit 1, and is supplied with AC power via the AC power cable 25. Supply necessary power. The power supply circuit 24 supplies the power required for the signal selection unit 2 to the DC-DC converter 26 via the cable 6 and
The C-DC converter 26 converts and supplies a voltage required for each circuit of the signal selection unit 2. As described above, the video signal, the control signal, and the power are exchanged between the video display unit 1 and the signal selection unit 2 by one multi-core cable. The power supply circuit 24,
The AC power cable 25 is arranged in the signal selecting section 2 and the DC-D
The C converter 26 may be provided in the video display unit 1.

As described above, since the cable 6 has a large number of signal lines and power lines, the cable 6 and the video display unit 1
A multi-pin connector is used for the connection of the signal selection unit 2 and this type of connector may cause a connection failure such as disconnection or insufficient insertion of the connector. For this reason, the video display device of the present invention includes the detection mechanism 35 for detecting the connection state of the connector.

Next, the detection mechanism 35 will be described with reference to FIG. FIG. 6 is a structural view for explaining a connector in which a detection mechanism 35 for detecting a connection state is arranged on a connector of a type in which a male connector and a female connector are joined together and then fixed with set screws 36. FIG. 6B shows an example of the configuration of the detection mechanism 35. The detection mechanism 35 is attached to the connector facing the receiving screw 37 of the set screw 36 for fixing the connector. Further, as shown in FIG. 6D, the detection mechanism 35 has a through hole on the same axis as the screw hole of the receiving screw 37, and stops when the connector is completely connected and is sufficiently fixed with the set screw 36. The screw 36 is positioned so as to just pass therethrough. Also, a light emitting unit 38 such as a light emitting diode is provided therein.
And a light receiving unit 39 such as a photodiode for receiving and detecting the light.

As shown in FIG. 6A, when the connector is not connected, that is, when the set screw 36 for fixing the connector does not close the hole of the detection mechanism 35, the state shown in FIG. As shown, the light from the light emitting unit 38 reaches the light receiving unit 39, and the control circuit that has received the output of the light receiving unit 39 detects that it is not connected, and issues a control signal to perform an appropriate action. On the other hand, when the connector is completely connected as shown in Fig. 6C, that is, when the set screw 36 for fixing the connector passes through the hole of the detection mechanism, it is shown in Fig. 6D. The light of the light emitting unit 38 is
The control circuit which has not reached 9 and has received the output signal from the light receiving unit 39 detects the connection state and issues a control signal to perform a corresponding measure. When an incomplete connection state of the connector is detected by the operation of the detection mechanism 35, the control circuit operates and, if necessary, the video display unit 1 and the signal selection unit 2
Safety functions, such as shutting off the power supply, are activated.

Further, the detection mechanism 35 is not limited to the method of detecting the connection state by light detection of a light emitting diode or the like shown in FIG.
May be employed. As shown in FIG. 7B, when the connector is in a completely connected state,
The microswitch 40 is arranged at a position where the tip of the set screw 36 for fixing the connector pushes the contact point of the microswitch 40 attached to the detection mechanism to turn on the switch. In this way, in the incomplete connection state of the connector as shown in FIG. 7A, the microswitch 40 is turned off, and it is detected that the connection state is incomplete.

If the above-mentioned connector is a general-purpose connector used for a computer device or the like, the connector is erroneously connected in combination with the video display unit 1 and another device or the signal selection unit 2 and another device. In such a case, a failure may occur in each device. In order to prevent this, an uneven portion is provided on the male side and the female side of the connector, and the outer shape is changed so that the uneven portions of both sides completely match. FIG. 8A shows an embodiment of a connector in which an irregular shape is provided on the outer shape of the connector, and FIG. 8B shows an example of connection between the connector with this change and a general-purpose connector. is there. As can be seen from the figure, complete connection is not possible because the irregularities on the outer shape do not match, and it is possible to avoid the risk of accidentally connecting to another device and causing a failure.

FIG. 9 shows a signal selection section 2 according to another embodiment of the present invention. This is obtained by further adding a tuner circuit 10 to the above-described signal selection unit 2 shown in FIG. In FIG. 9, for example, a VHF / UHF antenna 51 that receives a terrestrial television signal and a parabolic antenna 52 that receives a television signal from a broadcast satellite, for example, are supplied to a tuner circuit 10. A signal in a desired frequency band is tuned and selected in the tuner circuit 10 and converted into a video signal. The converted signal is supplied to the selection circuit 4.

The selection circuit 4 is provided with an additional switch circuit for the tuner circuit 10. The selection circuit 4 performs a switching operation based on a control signal from the control circuit 3, and the MUSE decoder 8b, VCR 9b, personal computer Whether one video signal is selected from the Hi-Vision signal, video signal, RGB signal from the 7b side and the signal from the tuner circuit 10 and sent to the video display unit 1, or is connected to GND. Is selected. The signal selected by the selection circuit 4 is supplied to the video display unit 1 via the transmission circuit 5, one cable 6, and the reception circuit 20, as in the above-described embodiment.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. For example, in the embodiment of the present invention, the video display unit 1 and the signal selection unit 2 are provided separately, but the video display unit 1 and the signal selection unit 2 may be provided integrally. In this case, the internal wiring of the video display device is simplified.

Further, in the embodiment of the present invention, a configuration has been described in which one video signal is selected as an output of the signal selection unit 2 and the video signal is supplied to one video display unit 1. May be distributed to a plurality of video display units. In this case, the same screen can be displayed on each video display device by a simple transmission path, and the system The degree of freedom in image expression is improved.

Further, in the 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 different video signals. Further, in the selection circuit 4 or the switching circuit 21,
One type of video signal is selected and displayed on the display unit 23. These circuits select a plurality of video signals and combine the selected plurality of video signals to form a new video signal ( For example, a plurality of video signals can be displayed on the display unit 23 by providing a picture-in-picture circuit).

Further, in the embodiment of the present invention,
Although the signal transmission between the video display unit 1 and the signal selection unit 2 is performed using a wired signal transmission unit using the cable 6, a wireless signal transmission unit using electromagnetic waves, infrared rays, or the like may be used.

[0050]

As described above, according to the present invention, in a video display apparatus for selecting and displaying a desired video signal from a plurality of video signals having different forms, a dedicated selecting means is provided for each signal source of each video signal. It is not necessary to provide a display, and it is possible to perform display corresponding to each of the video signals having different forms. Even if a plurality of devices serving as signal sources are connected in parallel and a plurality of video signals of different forms are supplied, installation work is easy, and even when one video signal is appropriately displayed from the plurality of video signals, Operation becomes easy. Further, only one cable may be used to connect the separate video display unit and the signal selection unit, and even if the connector is incorrectly connected or half-inserted, the device does not fail or malfunction, and the signal transmission path is not changed. Is not complicated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a video display device according to an embodiment of the present invention.

FIG. 2 is a connection diagram of various video devices of the video display device according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating signal switching in a signal selection unit.

FIG. 4 is an explanatory diagram illustrating signal switching in a video display unit.

FIG. 5 is a block diagram illustrating a signal transmission method between a video display unit and a signal selection unit.

FIG. 6 is an explanatory diagram illustrating a detection mechanism.

FIG. 7 is an explanatory diagram illustrating another detection mechanism.

FIG. 8 is an external view of the connector for explaining the shape of the connector.

FIG. 9 is a block diagram illustrating another embodiment of the signal selection unit.

FIG. 10 is a connection diagram between a conventional video display device and various video devices.

FIG. 11 is a block diagram illustrating a configuration of a conventional video display device.

FIG. 12 is an explanatory diagram illustrating a power supply method of a conventional video display device.

FIG. 13 is an explanatory diagram illustrating another power supply method of the conventional video display device.

[Explanation of symbols]

1, 101, 201: video display unit, 2, 202: signal selection unit, 3, 19, 119: control circuit, 4: selection circuit, 5
... Transmission circuit, 6,214,217 ... Cables, 7a, 7
b: personal computer; 8a, 8b: MUSE decoder; 9a, 9b: VCR; 10: tuner circuit;
1,12,13,21,111,112,113,13
Reference numeral 1: switching circuit, 16, 116: high-definition signal processing circuit, 17, 117: video signal processing circuit, 18, 118
... RGB signal processing circuit, 20 ... Reception circuit, 22, 132
... Driving circuits, 23, 133, 211 ... Display units, 24, 2
12, 215: power supply circuit, 25: AC power cable, 2
6 DC-DC converter, 31 Inverting buffer, 32
... Non-inverting buffer, 33 ... Amplifier, 34 ... Twisted pair wire, 35 ... Detection mechanism, 36 ... Set screw, 37 ... Receiving screw, 38 ... Light emitting unit, 39 ... Light receiving unit, 40 ... Micro switch, 41, 42, 43, 44, 45 ... switch circuit,
51 VHF / UHF antenna, 52 parabolic antenna, 121 selector for RGB signal, 122 selector for high-definition signal, 123 selector for video signal,
213: reception / drive circuit, 216 ... selection / transmission circuit.

Claims (13)

[Claims] 1. A video display device which receives a plurality of video signals of different forms and displays at least one of the video signals, wherein a video display corresponding to the plurality of video signals of different forms is provided. Means, a plurality of video signals of different forms are supplied, selection means for outputting at least one video signal as selectable, and transmission of transmitting at least one video signal selected by the selection means to the video display means And a control means for transmitting and receiving a control signal through two-way communication to control the functions of the video display means and the selection means. An image display device characterized by the above-mentioned. 2. The video display device according to claim 1, wherein when the selection unit does not select any video signal, the selection unit outputs a reference potential. 3. The apparatus according to claim 1, wherein said selecting means includes a receiving means for receiving the broadcast and converting it into a video signal.
The image display device according to the above. 4. The video display device according to claim 1, wherein said video display means has a power supply circuit, and supplies power to said selection means via said transmission mechanism. 5. The video display device according to claim 1, wherein said selection means has a power supply circuit, and supplies power to said video display means via said transmission mechanism. 6. The video display device according to claim 1, wherein the transmission mechanism has a wired transmission unit. 7. The video display device according to claim 6, wherein said transmission mechanism uses an optical fiber as a transmission means of the video signal and the control signal. 8. The video display device according to claim 6, wherein said transmission means is constituted by one cable. 9. The image display device according to claim 1, wherein the transmission mechanism has a wireless transmission unit. 10. The transmission mechanism according to claim 1, wherein the transmission mechanism has a detection mechanism for detecting a connection state between the image display means and the transmission mechanism and a connection state between the selection means and the transmission mechanism. Video display device. 11. When the detection mechanism detects that one or both of a connection state between the video display means and the transmission mechanism and a connection state between the selection means and the transmission mechanism are in a non-connection state, 11. The video display device according to claim 10, further comprising a safety circuit for shutting off a power supply of the video display device. 12. The video signal transmitted from the selection means to the video display means, or the video signal and control signal transmitted from the selection means to the video display means are digital multiplexed signals. Item 2. The video display device according to Item 1. 13. The transmission mechanism has a connector at a connection part with the image display means and a connection part with the selection means, and a joint surface of the connector has a concave-convex shape at a part thereof. The video display device according to claim 1.