JPH10240212A - Video display device - Google Patents

Abstract

(57) [Problem] To provide an image display device in which a plurality of images are displayed on a single screen without losing the size, and a plurality of persons simultaneously watch different images. Kind Code: A1 Abstract: Shutter glasses configured to open and close the field of view of right and left eyes in synchronization with a video signal displayed on a screen;
And displaying the video signals periodically on the same screen in a time-division manner, and selecting one of the N video signals displayed on the screen, shutter glasses according to the cycle of the selected video signal. To open and close.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display apparatus for displaying a plurality of images on one screen, and more particularly, to appropriately selecting and selecting a plurality of screen displays to be displayed on a screen or a display. The present invention relates to a video display device that outputs the audio of a video that has been output.

[0002]

2. Description of the Related Art In a conventional display device, when a plurality of programs are to be viewed on one display device, one screen is divided into several screens as in "multi-screen display of a wide television". One screen was a small screen.

[0003] However, when the screen is physically divided, the screen display to be displayed becomes small and hard to see. To avoid this inconvenience, Japanese Patent Application No. 8-194 filed by the same applicant has filed a request.
No. 235 discloses a single image display device that allows a plurality of persons to simultaneously view two separate images without losing the size of the screen.

This video display device includes a filter for left and right eyes, such as a liquid crystal shutter, which alternately displays two separate video signals on a single display screen as a video for each field and blocks light from passing therethrough. It is to be viewed with shutter glasses for stereoscopic image observation.

FIG. 6 shows an example using two shutter glasses.
1 shows an external appearance for viewing video images on one screen. The video display device has a television device 1, which has two shutter glasses 2 </ b> A and 2 </ b> B and a video device 3. The headphones 4 are connected via signal cables C.

[0006] A display screen 5 is arranged on the front of the television device 1, and speakers 6 are arranged on both sides thereof. Below the display screen 5, together with the operation unit 7, video signal input terminals T1, T2, shutter glasses terminals T3, T4,
Headphone terminals T5, T6 and the like are provided.

Various buttons are arranged on the operation unit 7.
The operator can also select the two-screen simultaneous display mode and the stereoscopic video display mode.

As shown in FIG. 7, two circuits are incorporated in a video display device having such an appearance so as to display two separate video signals on a screen.

That is, the two TV tuners 10A, 10A
B and switch SW for switching video input
1, SW2; Y / C separators 11A and 11B for separating a composite video signal into a luminance signal and a chroma signal;
/ D converters 12A, 12B, 12C, and 12D, color decoders 13A and 13B, and FIFOs (first-in first-out) 14A and 14B that are memories.
A switch circuit 15 for outputting one of the video signals from the two FIFOs 14A and 14B, and a D / A converter 1
6A, 16B, 16C, RGB decoder 17, CR
A T driving circuit 18, a CRT 19, shutter glasses driving circuits 20A and 20B for outputting shutter driving signals to the respective shutter glasses 2A and 2B, and a controller 2
And 1. This controller 21
Reading / writing to / from IFOs 14A and 14B, switching of switch circuit 15, and shutter glasses driving circuit 20
A and 20B are controlled.

In the screen display of two programs configured as described above, the field frequency is doubled, and two video signals are alternately displayed for each field.

On the other hand, two shutter glasses 2A, 2B
Opens and closes shutters for the left and right eyes according to a shutter drive signal for controlling passage and blocking of light. That is, since the shutter drive signal is synchronized with the field frequency of the two video signals, if the shutter is opened and closed by this shutter drive signal, only the one video signal selected from the two video signals is adapted. You can see the video.

[0012]

However, the image in the above-mentioned prior art is smaller than the original image because the screen of one display is divided and two images are displayed, and the image which is not seen from each other is displayed. The presence of the display was in the way. Further, there is a problem that voices interfere with each other.

There is also an image display device such as a so-called DVD (Digital Video Disk) which allows the user to select one of a plurality of images of the same image material from the front, side, top, and commentary. However, it is good to watch it alone, but when trying to watch it by multiple people, only one screen can be selected.

Further, in the prior art by the same applicant, shutter glasses for viewing an image projected on a screen are limited to selecting two screen displays and viewing one image signal. There is a problem that the operation cannot be performed on the shutter glasses side in addition to being unable to be viewed by a plurality of persons.

[0015] Therefore, there is a problem that an image that can be displayed on at least three or more screens projected on the screen must be solved to shutter glasses that can be appropriately selected.

[0016]

In order to solve the above-mentioned problems, a video display device according to the present invention is provided with shutter glasses that open and close the fields of view of the left and right eyes in synchronization with a video signal displayed on a screen. , A display means for periodically displaying the N video signals on the same screen in a time-division manner, and selecting one of the N video signals displayed on the screen. Video selecting means for opening and closing the shutter glasses according to the cycle of the video signal.

With such a configuration, at least three or more persons can view different images displayed on the same screen individually or in an overlapping manner.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a video display device according to the present invention will be described with reference to the drawings. The same parts as in the prior art will be described with the same reference numerals.

FIG. 1 is an external perspective view of an image display device.
FIG. 2 shows a block diagram of a circuit of the video display device.

In FIG. 1, the image display device has a television device 1, which has four shutter glasses 2A, 2B, 2C, 2D and N image signals, in this embodiment three image signals. Four DVDs (Dig) for reproducing video signals
ital Versatile Disc) Player 2
1A, 21B, 21C, and 21D are connected to the television device 1 as a display via a controller 22. The DVD players 21A to 21D have a structure that can be driven by remote control operation.

The shutter glasses 2A, 2B, 2C, 2
D includes a headphone 23 for listening to a sound which is a sound output means.
A, 23B, 23C, 23D and four DVD players 2
The structure is provided with selectors 24A, 24B, 24C, and 24D, which are video selecting means provided on the side of the shutter glasses 2A to 2D for selecting video signals from 1A, 21B, 21C, and 21D.

As shown in FIG. 2, four circuits are incorporated in the circuit of the video display device having such an appearance so as to display four separate video signals on a screen.

That is, four Y / C separators 10A to 10D for separating a composite video signal as a first to fourth video input signals into a luminance signal (Y) and a chroma signal (C).
And eight A / D converters 11A to 11H for converting analog signals of the luminance signal (Y) and the chroma signal (C) into digital signals, and converting the digitized chroma signal (C) into a color difference signal. Four color decoders 1 to convert
3A to 13D, four memories (FIFOs) 14A to 14D,
A switch circuit 15 for time-divisionally outputting video signals from the FIFOs 14A to 14D, and a D / A conversion for converting time-divisionally digitized color difference signals (Y, RY, BY) into analog signals Devices 16A to 16C and RG for converting color difference signals (Y, RY, BY) into a video signal composed of three color signals of red (R), green (G), and blue (B)
A B decoder 17 and a CRT for driving a CRT 19 based on three color signals and displaying an image on a display screen of the CRT 19
And a drive circuit 18.

The memory controller 21 controls reading and writing to and from the FIFOs 14A to 14D, switching of the switch circuit 15, and control of the shutter glasses driving circuits 20A to 20D.

On the other hand, the audio signals of the four video signals are amplified by an amplifier and supplied to selectors 24A to 24D via connectors 25A to 25D. The selectors 24A to 24D are connected to connectors 25A to 25D.
Glasses driving circuit 20A connected via the
20D has a structure in which sound can be selected in conjunction with screen display of four video signals.

The selectors 24A to 24D are connected to the shutter glasses 2A to 2D, and are connected to the selector 24A.
By switching between .about.24D, a desired video signal can be selected from the four video signals on the shutter glasses 2A-2D side. When a desired video signal is selected, the audio signal is automatically supplied to the headphones. Of course, the same screen can be viewed with a plurality of shutter glasses 2A to 2D, and different screens can all be viewed with the four shutter glasses 2A to 2D.

The television apparatus 1 has shutter glasses driving circuits 20A to 20D for four video signals, and outputs four selectors 24A to 24D via connectors 25A to 25D. , And controls the shutter glasses 2A to 2D by a shutter drive signal synchronized with the image selected by the selectors 24A to 24D. That is, the shutters of the shutter glasses 2A to 2D are opened and closed in synchronization with the video signal selected by the selectors 25A to 25D, and only the selected video can be viewed.

Each of the shutter glasses 2A to 2D is composed of a filter for the right and left eyes that can freely pass and block light, for example, a liquid crystal shutter. Both filters control the passage and cutoff of light by the shutter drive signal.
Specifically, the left and right filters repeatedly pass and block light based on a shutter drive signal based on the video signal selected by the selectors 24A to 24D.

The shutter glasses 24A to 24D
When multiple video signals are not displayed on the screen, a stereoscopic video signal can be displayed and the light passing through the filters for the left and right eyes of the shutter glasses can be alternately cut off to view the stereoscopic video. Has become.

Next, the operation of the video display device thus configured will be described. In FIG. 2, four video signals and audio signals are input from the first to fourth video inputs and the first to fourth audio inputs, respectively, subjected to signal processing, and supplied to the four FIFOs 14A to 14D, respectively. Is done.

When the memory controller 21 receives the instruction for the four-screen simultaneous display mode, the memory controller 21
Control is performed so that a write clock of a normal frequency is output to A to 14D and data is written. In addition, the memory controller 21 uses the four FIFOs 14A-
14D, a read clock having a normal frequency is output in the order of the fields, and four FIFOs 14A to 14D are output.
It is also controlled to read from.

FIG. 3 shows a method of rearranging the odd / even fields of the four video signals from the four FIFOs 14A to 14D and displaying them on one screen. The first to fourth shutter glasses are opened and closed in synchronization with the odd (ODD) fields of the first to fourth video inputs in the (EVEN) fields, and thereafter, the even (EVE) of the first to fourth video inputs are opened.
N) The first to fourth shutter glasses are opened and closed in synchronization with the field.

That is, four video signals (FIFOs 14A to 14A-
14D) odd (ODD) fields and even (EVE) fields.
N) Synchronize with the field, generate shutter drive signals from the respective shutter glasses driving circuits 20A to 20D, and use these signals to open and close the shutters of the shutter glasses 2A to 2D.

When the shutter drive signal is generated by the odd / even fields in this manner, for example, if the shutter glasses 2A select the first video input with the selector 24A (the state of FIG. 2), The shutter becomes "open" in the odd field of 1, and then opens in the first even field after three fields.

That is, the video of the first video input can be viewed by opening the odd / even fields every four fields. Therefore, the video of the first video input, in which even / odd fields are alternately displayed on the screen, can be viewed through the shutter glasses 2A, and the sound thereof can also be heard through the headphones 23.
A (see FIG. 2). If the images are displayed on the screen at the same time without being alternately displayed on the screen, the field frequency may be quadrupled.

FIG. 4 shows that the first half (first and second video inputs) of the four video signals from the four FIFOs 14A to 14D correspond to odd (ODD) fields and the second half (third and fourth video inputs). Sets the even (EVEN) field to 1
The first and second shutter glasses are opened and closed in synchronization with the odd fields of the first and second video inputs, and the even numbers of the third and fourth video inputs are displayed on one screen. The third and fourth shutter glasses are opened and closed in synchronization with the field.

That is, the shutter driving signals are generated from the shutter glasses driving circuits 20A and 20B in the odd number (ODD) fields of the first two video signals (first and second video inputs), and the second two video signals (first and second video signals) are generated. The shutter driving signal is generated from the shutter glasses driving circuits 20C and 20D in the even (EVEN) fields of the third and fourth video inputs).

With this configuration, for example, when the second video input is selected by the selector 24A (see FIG. 2),
In the shutter glasses 2A, the shutter opens and closes every odd field from the second video input, so that the second video signal can be viewed. Therefore, the video of the second video input, in which the odd / odd fields are displayed on the screen, can be viewed with the shutter glasses 2A, and the sound thereof can also be heard through the headphones 23.
A (see FIG. 2).

FIG. 5 shows a method for displaying only odd (ODD) fields of four video signals (first to fourth video inputs) from four FIFOs 14A to 14D on one screen. The first to fourth shutter glasses are configured to be opened and closed in synchronization with odd fields of the first to fourth video inputs.

That is, shutter drive signals are generated from the shutter glasses drive circuits 20A to 20D only with the odd (ODD) fields of the four video signals (first to fourth video inputs).

With this configuration, for example, when the third video input is selected by the selector 24A (see FIG. 2),
The shutter glasses 2A can open and close the shutter for each odd field from the third video input to see the third video signal, and can also listen to the sound with the headphones 23A (see FIG. 2).

It should be noted that the present invention is not limited to the examples shown in FIGS. 3 to 5, and any video may be displayed on the screen and any field may be displayed on the screen so that one of them can be selected. is there. Also, shutter glasses 2A to 2D for viewing the screen
Has been described as four, but the number of shutter glasses is not limited as long as a desired image can be selected with a selector.

Furthermore, although the description has been made using a DVD player, the present invention is not limited to this. For example, a television tuner, a video tape recorder, or the like may be used.
Further, the four signals may be combined into one from the beginning, and software or a soft regenerator may be used.

In this way, even at least three or more video signals can be displayed on the same screen at the same time, and a plurality of viewers can simultaneously display a plurality of videos individually on the full display screen. You can watch it as a video.

[0045]

As described above, the video display apparatus according to the present invention periodically displays a plurality of video signals, for example, four video signals, on the same screen in a time-division manner, and displays the selected video signal at the selected period. By opening only the shutter, one of a plurality of video signals can be selected and viewed, and the sound of the selected video signal can be reproduced with headphones, and a single display can be used. Thus, there is an effect that a plurality of people can enjoy different images and sounds.

[Brief description of the drawings]

FIG. 1 is a schematic overall perspective view of a video display device according to the present invention.

FIG. 2 is a block diagram of a circuit of the video display device.

FIG. 3 is an explanatory diagram showing a screen display for each field of the plurality of video signals.

FIG. 4 is an explanatory diagram showing another example of screen display for each field of the plurality of video signals.

FIG. 5 is an explanatory diagram showing another example of a screen display for each field of the plurality of video signals.

FIG. 6 is a schematic overall perspective view of a video display device according to the prior art.

FIG. 7 is a block diagram of a circuit of the video display device in the prior art.

[Explanation of symbols]

1; TV device, 2A to 2D; shutter glasses, 10A
10D; Y / C separator, 11A-11H; A / D converter, 13A-13D; color decoder, 14A-14
D; FIFO, 15; switch circuit, 16A to 16C;
D / A converter, 17; RGB decoder, 18; CRT drive circuit, 19; CRT, 20A to 20D; shutter glasses drive circuit, 21A to 21D; DVD player, 22;
Controllers, 23A to 23D; Headphones, 24A to
24D; selector, 25A to 25D; connector

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09G 5/18 G09G 5/18 H04N 5/66 H04N 5/66 D 13/04 13/04

Claims (4)

[Claims] 1. A pair of shutter glasses which opens and closes the field of view of right and left eyes in synchronization with a video signal displayed on a screen.
Display means for periodically displaying the video signals on the same screen in a time-division manner, and selecting one of the N video signals displayed on the screen, and selecting the selected video signal A video selection device for opening and closing the shutter glasses according to the cycle of the video display. 2. The video display device according to claim 1, wherein said shutter glasses are provided with headphones for listening to audio, and audio output means for outputting the audio of said selected video signal to said headphones. 3. The video display device according to claim 1, wherein the N video signals are two or more. 4. The video display device according to claim 1, wherein said video selection means is provided on said shutter glasses side.