JPH04320177A - Multi-channel simultaneous display device - Google Patents

Abstract

PURPOSE:To enable plural persons to observe different pictures at the same time by using one display device. CONSTITUTION:Plural different video signals received by reception NTSC audio output circuits 121-12N are selected sequentially with a control signal from a changeover control signal generating circuit 14 and displayed on a CRT display device 18. Since an input light is interrupted by eyeglasses 20 when a video image not relating to the CRT display device 18 is displayed on the CRT display device 18 by applying switching control to the input light to the eyeglasses 20 synchronously with the changeover, the viewer views only a video image of a selected channel among video images displayed on the CRT display device 18 by wearing the eyeglasses 20 and watching the display pattern of the CRT display device 18.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel simultaneous display device such as a television receiver, which allows a plurality of people to simultaneously view different images on one display means.

0002

2. Description of the Related Art In recent years, television receivers (hereinafter simply referred to as televisions) have become widespread, and it has become almost unimaginable to live without a television. The programs that people want to watch vary from person to person, and an increasing number of households have multiple TVs and watch TV in separate rooms. In addition, using the so-called picture-in-picture function, 1
There are also televisions that can display two screens on a single unit. However, from an economic point of view, it is ideal for multiple people to watch the channels they want to watch on one TV.

0003

[Problems to be Solved by the Invention] However, conventional televisions cannot display multiple types of images at the same time. There was a problem that it was not possible to appreciate it. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a multi-channel simultaneous display device that allows a plurality of people to view different images at the same time using one display means.

0004

[Means for Solving the Problems] The multi-channel simultaneous display device of the present invention includes a receiving means for receiving a plurality of different video signals to be displayed, and a receiving means for sequentially switching the plurality of video signals received by the receiving means. It is equipped with a display means for displaying output, and glasses that are provided for each user and that transmit light only during a predetermined video signal period selected in synchronization with the switching.

[0005]

[Function] Multiple types of images can be displayed simultaneously on one display means, and by switching the input light of the glasses according to the image display, multiple people can each view different images on one display means. It is possible to view them at the same time.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Note that this embodiment will be explained by taking as an example a television system using the NTSC system, and taking as an example the received radio waves the NTSC signal adopted in the current television system.

In FIG. 1, a reception signal of a television broadcast radio wave output from an antenna 1 or an RF signal output from a video equipment 2 such as a video tape recorder is received by a receiver 3 and sent to a video intermediate frequency amplifier 4. It will be done. The video intermediate frequency amplifier 4 separates and amplifies the received signal from the receiving section 3 into an audio signal and a video signal.

The separated audio signal is passed through a 4.5M detector 5.
, an audio intermediate frequency amplifier 6, and an FM detector 7 to an audio amplifier 8. Further, the separated video signal is converted into an NTSC signal by a video detection/amplifier 9, and then sent to a synchronization signal detector 10 and an A/D converter 11, respectively. The synchronization signal detector 10 is a circuit that detects a synchronization signal from an NTSC signal, and the A/D converter 11 is a circuit that detects a synchronization signal from an NTSC signal.
This is a circuit that converts signals into digital signals.

[0009] These are A
/D converter is added, and since it is almost the same as the existing color TV circuit, a detailed explanation of the circuit will be omitted.
Receive these all at once/NTSC/Audio output circuit 121
shall be.

[0010] In the figure, for the sake of simplicity, it is shown that the received signal of the television broadcast radio wave and the RF signal from the video equipment 2 are input to the circuit 121, but one circuit is required for each signal. Therefore, the reception/reception is equal to the number of TV reception channels plus the number of input channels from other video equipment.
An NTSC/audio output circuit is required. In this embodiment, for example, N reception/NTSC/audio output circuits 121
~12N is provided.

It is assumed that the storage circuit 13 is composed of a FIFO memory for storing two frames, for example, with a maximum number of input channels (N). This storage circuit 13 stores the A/D converted NTSC signal of the currently selected channel.
A read signal with the same timing as the A/D conversion of the D converter 11 is used to capture the number of channels (i) in parallel, and a write signal with a timing that is (i) times the capture is used to capture from 1 channel to i.
Each frame is output sequentially up to the channel.

The switching/control signal generating circuit 14 generates, for example, a horizontal synchronizing signal of an NTSC signal, a vertical synchronizing signal, a channel switching signal (number of channels i), an A/D conversion clock,
Various control signals necessary for each circuit are generated from an oscillator (not shown). Since the method for creating this control signal is a simple existing technique, detailed explanation will be omitted. Note that the frequency of the A/D conversion clock is, for example, 14
．． The frequency shall be 31818MHz.

The switching/control signal generating circuit 14 also generates a write signal (
For example, 14.31818 MHz), a chip select signal that switches each time a frame ends, and a read signal that has a timing that is times the number of channels (i) of the write signal are created.

[0014] Since the NTSC signal is generally 30Hz per frame, the chip select signal is 30×iH.
This is the timing of z. The chip select signal is not output to the FIFO memories of unselected channels. As a result, even if a playback signal from a video tape recorder is input, the image data of a channel not selected by the viewer (user) will not be read from the FIFO memory to which the chip select signal is not input. , so that it is not output to subsequent circuits. Note that a read signal or a write signal obtained by ANDing the chip select signal may be used instead of outputting the chip select signal.

[0015] Furthermore, the receiving/NTSC/audio output circuit 12
1 to 12N are respectively supplied to the switching/control signal generation circuit 14, but all of these synchronization signals are the same signal, and it is sufficient that at least one of the synchronization signals is supplied.

Furthermore, the switching/control signal generation circuit 14
The number of D/A conversion clocks multiplied by the number of channels (i) of the A/D conversion clock is sent to the D/A converter 15. D
The /A converter 15 converts the digital NTSC signal output from the storage circuit 13 into a D/A signal (i) times after A/D conversion.
D/A conversion is performed using the conversion clock, and analog signals are output to the color demodulation/reproduction circuit 16 and the color synchronization circuit 17, respectively.

Color demodulation/regeneration circuit 16 and color synchronization circuit 1
7 is a circuit that reproduces the three primary color signals from the NTSC signal and outputs it to, for example, the CRT display device 18. The clock timing is (i) times that of a single channel, but is similar to that of a normal television system. Since the circuit is the same as the circuit, a detailed description of the circuit will be omitted.

The switching transmission circuit 19 receives a shutter switching signal for the glasses 20 from the switching/control signal generating circuit 14, and transmits the shutter switching signal to the glasses 20 wirelessly. The above shutter switching signal is transmitted to the memory circuit 1
This signal is the same as the chip select signal corresponding to each selected channel among the chip select signals outputted to the channels 3 and 3.

[0019] Regarding wireless transmission and reception between the switching transmission circuit 19 and the glasses 20, data is transmitted and received at a low frequency of, for example, about 1 KHz, and may be performed using radio waves or light. A detailed explanation of the circuit will be omitted since it can be fully handled by the following.

The glasses 20 are, for example, glasses with a liquid crystal shutter function, which have a liquid crystal shutter in the lens portion.
By receiving the shutter switching signal sent from the switching transmission circuit 19 and controlling the opening and closing of the liquid crystal shutter according to the shutter switching signal, switching operation is performed to block light from channels other than the selected channel. .

The audio switching circuit 21 selectively switches between the audio amplifier 8 and the audio output section (for example, headphones) 221 - 22N of the corresponding reception/NTSC/audio output circuit 121 - 12N according to the channel selected by the viewer. This is the circuit to be connected.

Next, the operation in such a configuration will be explained. As for the signal flow, antenna 1 first receives the received TV broadcast radio waves, but one circuit is required for each channel, and if there is an i-channel input including the input of video equipment 2 such as a video tape recorder, etc. , 1 to i, one channel is assigned to each circuit.

[0023] First, each television viewer selects a channel that they wish to watch. For example, if there are three viewers and the channels they have selected are Channel 1, Channel 4, and Channel 8, the circuits 121 to 123 to which the respective channels are assigned receive TV broadcast waves and convert audio and video signals. The video signal is sent to the A/D converter 11 using an A/D conversion clock (14.318
18MHz) and outputs it to the storage circuit 13 as image data.The audio signal is reproduced by the audio circuits 5 to 8, and then sent to the corresponding audio output section 22 by the audio switching circuit 21.
Output to 1 to 22N.

[0024] Note that from the audio switching circuit 21 to the audio output section 2
The method of outputting the audio data to 21 to 22N may be performed cordlessly using the existing well-known technology of wireless or optical communication.

Furthermore, in the synchronization signal detection circuit 10,
A synchronization signal is detected from the NTSC signal before being digitized, and sent together with the A/D conversion clock to the switching/control signal generation circuit 14 to generate various control signals. Memory circuit 13
The three channels of image data sent to the RD signal (14.31818MH
z), they are written in parallel to the FIFO memory. At the stage where one frame of image data for each of the three channels has been written, a chip select signal that switches at 90 Hz causes the 1st channel, 4th channel, and 8th channel to be written one frame at a time in the order of 42. Each image data is read out using a read signal of 95454 MHz.

The image data read out from the FIFO memory is converted into an analog signal by the D/A conversion clock (42.95454 MHz) in the D/A converter 15, and then sent to the color demodulation/reproduction circuit 16 and the color synchronization circuit. circuit 1
7 respectively. These color demodulation/reproduction circuits 16
The color synchronization circuit 17 performs the same processing as a normal television, such as separation and extraction of synchronization signals and separation of luminance signals, and reproduces signals of the three primary colors and outputs them to the CRT display device 18. As a result, the CRT display device 18 displays 3 channels in 1/30 seconds in the order of 1 channel, 4 channels, and 8 channels.
Two screens display images at a total rate of 90 frames per second.

On the other hand, the switching/control signal generating circuit 14 outputs a shutter switching signal to the glasses 20 via the switching transmitting circuit 19. For example, for the glasses 20 that have selected channel 1, the same signal as the chip select signal for channel 1 supplied to memory circuit 13 is output as a shutter switching signal.

The glasses 20 receive this shutter switching signal and switch the liquid crystal shutter, so that the CRT
When an unrelated image is displayed on the display device 18, input light is blocked. Thereby, by wearing the glasses 20 and viewing the display screen of the CRT display device 18, the viewer can select from among the images displayed on the CRT display device 18.
You can only view the video of the selected channel.

In this way, conventionally, one television set has one
Previously, images from only one channel could be displayed, but with this example, images from multiple channels can now be displayed at the same time, allowing multiple people to watch images from different channels at the same time on one TV. becomes.

[0030]

[Effects of the Invention] As detailed above, according to the present invention, 1
It is possible to provide a multi-channel simultaneous display device in which a plurality of people can view different images at the same time using one display means.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a multi-channel simultaneous display device according to an embodiment of the present invention.

[Explanation of symbols]

1... Receiving antenna, 2... Video equipment, 3... Receiving section,
4...Video intermediate frequency amplifier, 5...4.5M detector, 6
...Audio intermediate frequency amplifier, 7...FM detector, 8...Audio amplifier, 9...Video detection/amplifier, 10...Synchronization signal detection circuit, 11...A/D converter, 121 to 12N
...Reception/NTSC/audio output circuit, 13...Storage circuit, 14...Switching/control signal generation circuit, 15...D/A converter, 16...Color demodulation/reproduction circuit, 17...Color synchronization circuit , 18... CRT display device, 19... switching transmission circuit, 2
0...Glasses, 21...Audio switching circuit, 221 ~ 22N
...Audio output section.

Claims (1)

[Claims] Claim 1: A receiving means for receiving a plurality of different video signals to be displayed; a display means for sequentially switching and displaying the plurality of video signals received by the receiving means; provided for each user; A multi-channel simultaneous display device comprising: glasses that transmit light only during a predetermined video signal period selected in synchronization with the switching.