JPH0916129A - Image display device - Google Patents

Abstract

PURPOSE: To obtain an image display device which is made light in weight, to reduce the volume of the part except a display part, to suppress heat generation, to improve picture quality, and is suitable to presentation while displaying a large image by forming an image according to a video signal selected by a signal selecting means. CONSTITUTION: A signal selecting means 3 selects a desired video signal out of video signals outputted by video signal reproducing means 4-8, and 11, and a video signal generating means 9 and a flat plate type display means 2 which uses liquid crystal forms and displays an image corresponding to the selected video signal. Consequently, the image display device 1 is light in weight and to reduce the volume of the part except the display part 2. In this case, when plural plane type display means 2, plural video signal reproducing means 4-8, and 11, and plural video signal generating means 9 are united, the need for connections is eliminated and a user can easily perform presentation like the user writes characters on a blackboard without being aware of the system constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for displaying light according to a video signal by allowing light to enter a liquid crystal from the back surface.

[0002]

2. Description of the Related Art Conventionally, as a device for displaying an image, there is an image display device using a cathode ray tube. An image display device using this cathode ray tube has excellent image quality and resolution, and is used, for example, in television receivers and monitor devices.

By the way, in recent years, large-sized image display devices have come to be used for presentations at exhibitions and for visual appeal at events where a large number of people gather.

[0004]

However, when the image display device using the above-mentioned cathode ray tube becomes large in size, the weight becomes very heavy, the volume increases, the depth also increases, and a large amount of heat is generated. Therefore, it was not suitable for the above presentations.

On the other hand, a rear projection display device called a so-called rear projector is also used for large-scale display, but it requires optical components such as a lens, the image is dark, and the resolution is not satisfactory.

On the other hand, a display device using a light emitting diode or a large fluorescent type pixel display device is suitable for outdoor display such as a stadium, but it is too large in volume as a display device used at the above-mentioned exhibition. And, the resolution was not satisfactory either.

Further, conventionally, the image display section and the recording / reproducing apparatus, the reproducing apparatus, the image signal generating apparatus, or a single combination thereof existed, but these are in mind for so-called home theaters and image editing systems. However, it was inconvenient when used at exhibitions.

The present invention has been made in view of the above circumstances, is lightweight while displaying a large image, can reduce the volume of the portion excluding the display portion, and further suppresses heat generation,
Moreover, it is an object of the present invention to provide an image display device which can improve image quality and is optimal for presentations.

[0009]

In order to solve the above-mentioned problems, an image display apparatus according to the present invention is a video signal desired by a signal selecting means from the video signals outputted by the video signal reproducing means and the video signal generating means. Is selected, and the flat panel display means using liquid crystal forms and displays an image in accordance with the video signal. Here, a plurality of the video signal reproducing means, the video signal generating means and the flat panel display means may be provided.

Further, in the image display device according to the present invention, as a plasma addressed liquid crystal display unit for controlling the liquid crystal which light passes through the flat panel display means by plasma to form and display an image according to the video signal. Good.

Further, the image display device according to the present invention comprises scan conversion means for converting the scanning state of a single video signal,
Of the outputs of the video signal reproducing means and the video signal generating means, the singular selected by the signal selecting means may be divided and displayed on the plurality of flat panel display means. In this case, the plurality of flat panel display means, the video signal reproducing means and the video signal generating means may be integrated.

Further, the image display device according to the present invention may supply the video signals output by the plurality of video signal reproducing means and the plurality of video signal generating means to the plurality of flat panel display means. Also in this case, the plurality of flat display means,
The plurality of video signal reproducing means and the plurality of video signal generating means may be integrated.

[0013]

The signal selecting means selects a desired video signal from the video signals outputted by the video signal reproducing means and the video signal generating means, and the flat panel display means using the liquid crystal displays an image according to the selected video signal. Form and display. For this reason,
The image display device according to the present invention is lightweight and can reduce the volume of the portion excluding the display portion.

[0014]

EXAMPLES Some examples according to the present invention will be described below.

First, in the first embodiment, as shown in FIG.
In the plasma addressed liquid crystal display unit 2, a plurality of video signal reproduction units and a plurality of video signals from a plurality of video signal generation units are used as a signal selection unit by a first signal selection unit 3 and a second signal selection unit not shown. It is the image display device 1 for selecting and displaying. The image display device 1 is effectively used for presentations at exhibitions and the like.

Here, as the plurality of video signal reproducing means, for example, a video broadcast receiving section 4, two video tape recorders 5 and 6, a video tape recorder 6, a multi-disc player 7, a video CD player 8, a game machine 1 are provided.
There is one. Further, as the plurality of video signal generating means,
For example, there are multiple computers such as computer 9.

As shown in FIG. 2, the video broadcast receiving section 4 includes a UHF / VHF tuner 15 for tuning a UHF / VHF signal via an antenna 14 and a BS / CS for tuning a satellite signal via a satellite antenna 16.
It consists of a tuner 17. UHF / VHF tuner 15
Receives a UHF and / or VHF television broadcast signal and converts it into a baseband video signal. BS / C
The S tuner 17 receives a BS / CS broadcast signal, converts it into a baseband video signal, and demodulates a PCM audio signal.

The video tape recorder 5 and the video tape recorder 6 record and reproduce video and audio signals. These may be an analog type or a digital type.

The multi-disc player 7 reproduces a video / audio signal from an optical disc or a magneto-optical disc.

The video CD player 8 is, for example, MPEG.
A video / audio signal is reproduced from a disc recorded by one method or a double-layer disc, for example.

The game machine 11 has various modes such as 16-bit and 32-bit.

The computer 9 creates a character, a symbol, a graph, a table, etc. by using software such as a word processor, an outline processor, and a spreadsheet, and outputs them. The image output from the computer 9 is directly supplied to the plasma addressed liquid crystal display unit 2 as an RGB signal,
The NTSC conversion unit 10 converts the NTSC signal.

The first signal selecting section 3 receives the video signals from the video broadcast receiving section 4, the video tape recorder 5, the video tape recorder 6, the multi-disc player 7, the video CD player 8, the game machine 11, and the computer 9. Plasma address liquid crystal display 2 by selectively switching
To supply.

As shown in FIG. 2, the first signal selecting section 3 includes an audiovisual (AV) switch 20,
It is composed of a comb filter 21 and a YC switch 22. A
The V switch 20 includes a baseband video signal from the video broadcast receiving unit 4 and a video tape recorder 5, a video tape recorder 6, a multi-disc player 7, a video CD player 8, a game machine via terminals 18 ₁ ... 18 _n. 11. Switch and select the NTSC video signal from the computer 9. The comb filter 21 is the AV switch 2
The video signal switched and selected at 0 is three-dimensionally YC separated. Y (luminance) signal and C from the comb filter 21
The (color) signal is output from the output terminal 23, and YC
It is supplied to the switch 22. The YC switch 22 is also supplied with the S terminal input via the terminals 19 ₁ ... 19 _n .
Then, the YC switch 22 receives the Y signal and the C signal from the comb filter 21 and the Y signal obtained from the S terminal input,
C signal and switch.

The plasma addressed liquid crystal display unit 2 is a computer R supplied through the terminals 25 and 26 with each NTSC video signal selected by the first signal selection unit 3.
After switching between the GB signal and the high-definition video signal with the HD / NTSC switch 27 serving as the second signal selection unit, the LCD
The image is displayed on the plasma addressed liquid crystal display 37 controlled by the controller 32. The high-definition video signal is a video signal obtained by decoding a digital video signal encoded by the so-called MUSE method or MPEG2.

The plasma addressed liquid crystal display unit 2 is supplied with the NTSC video signal from the first signal selection unit 3 in the NT.
SC demodulation double speed conversion circuit 24, the HD / NTSC switch 27, and a high-definition video signal which is switched and selected by the HD / NTSC switch 27 or a normal NTSC video signal, which is a color signal for adjusting the color saturation and the hue. A conversion processing circuit 28, an A / D converter 29 for A / D converting the video signal (RGB signal) supplied from the color signal conversion processing circuit 28, and an R supplied from the A / D converter 29.
A frame rate converter (hereinafter referred to as FRC) circuit 30 for converting the frame rate of a GB signal, and the F
It is supplied from the HD / NTSC switch 27 and a liquid crystal driver 31 which drives the plasma address type liquid crystal display 37 based on the RGB signals supplied from the RC circuit 30 so as to supply an image signal level to each pixel of each horizontal line. An LCD controller 32 that generates a timing signal in synchronization with a video signal, and a plasma driver 33 that drives each pixel of each horizontal line of the plasma addressed liquid crystal display 37 based on the timing signal.
And a gamma correction circuit 34 for performing gamma correction suitable for the plasma addressed liquid crystal display 37 based on the timing signal, and the plasma addressed liquid crystal display 37.
The backlight 36 for irradiating the back light 36, the illuminance setting circuit 35 for adjusting the illuminance of the backlight 36, the liquid crystal driver 31 and the plasma driver 33 are driven, and the illuminance setting circuit 35 adjusts the illuminance of the backlight 36. And a plasma addressed liquid crystal display 37 for displaying images.

As shown in FIG. 3, the NTSC demodulation double speed conversion circuit 24 demodulates the color signal on the color carrier from the YC switch 22 and outputs the color difference signal to the NTSC demodulation section 40.
A frame double speed processing unit 41 for converting the interlaced scan signal into a non-interlaced signal by using the color difference signal and the Y signal from the YC switch 22 and further increasing the scan speed; and the frame double speed using the image memory 43. The NTS converted into the HD / NTSC switch 27 by performing aspect conversion processing of the video signal via the processing unit 41 and further converting the display state of the screen such as zoom mode.
It comprises an aspect conversion processing unit 42 for supplying a C video signal and the image memory 43.

The HD / NTSC switch 27 is a high-definition video signal obtained by decoding a digital video signal encoded by the so-called MUSE system or MPEG2 as described above and the RGB signal for the computer, and the NTSC demodulation double speed conversion circuit 24. It is a second signal selection unit for switching between a normal NTSC video signal supplied from the.

The color signal conversion processing circuit 28 is an HD / NTS
Hugh color adjustment is performed on the video signal selected by the C switch 27, and inverse matrix conversion processing is performed to generate an RGB signal.

The A / D converter 29 A / D converts the video signal level of the RGB signal supplied from the color signal conversion processing circuit 28 with 8-bit quantization accuracy.

The FRC circuit 30 includes an A / D converter 29.
The least significant bit of the digitized RGB signal of 8 bits supplied from is rounded and quantized with 7 bits.

The liquid crystal driver 31 forms the signal level of each RGB video signal having a resolution of 7 bits supplied from the FRC circuit 30 in 128 gradations, and each horizontal line of the plasma addressed liquid crystal display 37. Supply to the transparent electrode of the pixel.

As shown in FIG. 4, the LCD controller 32 includes a sync separation circuit 45 for separating the sync signal from the video signal of the HD / NTSC switch 27, and a liquid crystal driving circuit based on the sync signal separated by the sync separation circuit 45. Vertical drive signal generating circuit 46 for generating the vertical drive signal and horizontal drive signal generating circuit 4 for generating the horizontal drive signal from the synchronous permeation.
7 and 7.

The vertical drive signal from the vertical drive signal generation circuit 46 is supplied to the plasma driver 33, and the horizontal drive signal from the horizontal drive signal generation circuit 47 is supplied to the gamma correction amplifier 3.
It is supplied to the liquid crystal driver 31 after being .gamma.
The horizontal drive signal is FRC as shown by the broken line.
It is also supplied to the circuit 30.

The plasma driver 33 is the liquid crystal driver 3
In synchronism with 1, while the liquid crystal driver 31 drives the transparent electrodes of each horizontal line of the plasma addressed liquid crystal display 37, the cathode and anode electrodes of each plasma chamber of the plasma addressed liquid crystal display 37 are sequentially arranged. The plasma chamber is sequentially driven to discharge by driving so as to switch and scan in the horizontal direction.

The backlight 36 irradiates the light whose illuminance can be variably set by the illuminance setting circuit 35 from the rear surface side to the main surface side of the plasma addressed liquid crystal display 37.

The plasma addressed liquid crystal display 37 is a liquid crystal display in which each pixel is driven by using discharge plasma, and a large screen can be realized at low cost. The plasma addressed liquid crystal display is disclosed in, for example, Japanese Patent Laid-Open No. 1-217396, and a specific example of the plasma addressed liquid crystal display 37 will be described below with reference to FIGS. 5 to 7 show a plasma addressed liquid crystal display as a kind of active matrix type liquid crystal display device using plasma, which is formed by stacking a plasma chamber and a liquid crystal layer.

FIG. 5 is an exploded perspective view schematically showing the structure of the display panel of the plasma addressed liquid crystal display. Light from a light source such as the backlight 101 is transmitted through the polarizing filter 102 to the back glass 103 and the thin glass plate. 1
The liquid crystal layer 105 is led out to the outside via the polarizing filter 107 via the plasma chamber sandwiched by 04 and the liquid crystal layer enclosed by the thin glass plate 104 and the windshield 106. The light emitted from this light source to the outside,
A two-dimensional image display is performed by selectively controlling the transmission and blocking of each pixel in the liquid crystal display structure. That is, a two-dimensional matrix is formed by the transparent electrodes 108 arranged in parallel in one direction (vertical direction in the figure) and the plasma discharge pattern formed in the direction orthogonal to the arrangement direction of the transparent electrodes 108. The polarization direction is changed by selectively applying an electric field to the pixels of the liquid crystal layer at the intersections of the dimensional matrix to change the polarization directions of the polarization filters 102 and 107.
The light transmission / blocking control is performed for each pixel in the liquid crystal display structure including the.

Each part will be described in more detail below. The backlight 101, which is the light source in FIG. 5, acts as a light source from behind the display panel. Backlight 101
The brightness of the display screen can be controlled by controlling the brightness of. The polarization filter 102 is the backlight 1 described above.
Of the light 01, only light having a predetermined polarization plane is allowed to pass therethrough, and is formed on the back surface of the back glass 103, that is, the surface on the light source side. The back glass 103 supports the space for holding the plasma, that is, supports the plasma chamber and has mechanical strength, and also contributes to the mechanical stability of the display panel. The thin glass plate 104 facing the back glass 103 and sandwiching the plasma chamber is
A boundary between the plasma chamber and the liquid crystal layer is formed, and it is optically transparent and allows an electric field to pass therethrough, so that the electric field between the electrode formed by plasma discharge and the transparent electrode 108 acts effectively on the liquid crystal. Has been done. Liquid crystal layer 105
Is formed by enclosing a liquid crystal material whose polarization direction is changed by an electric field between the thin glass plate 104 and the windshield 106. The windshield 106 seals the liquid crystal material and supports the transparent electrode 108. The polarization filter 107 further polarizes the light generated by the backlight 101 and passing through the liquid crystal layer 105. The transparent electrode 108 is a back surface of the windshield 106,
That is, it is formed on the surface on the liquid crystal layer 105 side in a stripe shape parallel to each other and is used as one electrode for applying an electric field to the liquid crystal, and is mainly optically transparent such as ITO (indium tin oxide). And a material having high conductivity is used.

The plasma chamber has a space defined by the back glass 103 and the thin glass plate 104 in which the cathode electrode 1 is formed.
09 and the anode electrode 110 are arranged alternately in a direction orthogonal to the arrangement direction of the transparent electrode 108, and each electrode is separated by a rib 112 serving as a partition. The cathode electrode 109 is applied with a negative voltage when generating plasma and emits electrons. The anode electrode 110 can be applied with a positive voltage when generating plasma. In the example of FIG. 5, ribs 112 are formed on each anode electrode 110, and the tops of these ribs 112 are brought into contact with the back surface of the thin glass plate 104, that is, the surface on the back glass 103 side,
It functions as a partition that divides the plasma chamber into elongated chambers. This small chamber corresponds to the liquid crystal driving electrode on the plasma chamber side, and this small chamber is also called a discharge channel. An ionizable gas, such as helium, neon, or argon, or a mixed gas thereof is enclosed in the plasma chamber. When a predetermined voltage of, for example, about 300 V is applied between the cathode electrode 109 and the anode electrode 110 in a predetermined discharge channel, the gas in the discharge channel is ionized and plasma discharge is generated. In the example of FIG. 5, the rib 112 serving as a partition is formed only on the anode electrode 110, but the cathode 112 and the anode electrode 11 are formed.
It is also possible to form ribs serving as partition walls on the upper and lower sides. In this case, a discharge channel is formed between the cathode electrode 109 and the anode electrode 110.

FIG. 6 is for further explaining the switch operation by plasma discharge of the display panel structure shown in FIG. Here, the switch 111 corresponding to the ON state of the discharge channel in the plasma discharge state is formed by the action of the anode electrode 110 and the cathode electrode 109 of FIG. 5 and is used for the addressing of the liquid crystal pixel together with the transparent electrode 108 of FIG. . That is, the transparent electrode 108 and the discharge channel in the plasma chamber are used as the parallel electrodes in the row direction and the parallel electrodes in the column direction which are orthogonal to each other to form the two-dimensional matrix. Here, the inside of the discharge channel where the plasma discharge is generated is maintained at a substantially anode potential, and in this state, the transparent electrode 108
When the data voltage is applied to the liquid crystal layer 105, the data voltage is written to the liquid crystal layer 105 of the plurality of pixels arranged in the column direction corresponding to the discharge channel via the thin glass plate 104. When the plasma discharge ends, the discharge channel becomes a floating potential, and the data voltage written in the liquid crystal layer 105 of each pixel is held until the next writing period, for example, after one field or one frame. That is, the discharge channel functions as a sampling switch, and the liquid crystal layer 105 of each pixel functions as a sampling capacitor. In the example of FIG. 6, the pixels of the liquid crystal layer corresponding to each discharge channel are shown as liquid crystal pixels 105a, and the transparent electrode 1 is added to these liquid crystal pixels 105a.
08 through video signals S1, S2, S3, S4, S5.
.. is applied as the data voltage. A normal TFT type liquid crystal display panel uses a transparent electrode in both the row and column directions without using the plasma.

FIG. 7 is an enlarged view of FIG. The same components as those in FIG. 5 are assigned the same numbers. Color filter 11
3 displays color by displaying the three primary colors of RGB.

Here, as a concrete example of the dimensions of each part,
The liquid crystal layer 105 has a thickness of 5 μm, and the thin glass plate 104 has a thickness of 50 μm.
μm, the height of the ribs 112 is 200 μm, and the array pitch L of the anode electrodes 110 is the width of the discharge channels.
P is 690 μm and the width LC of the cathode electrode 109 is 120
μm, the width LA of the anode electrode 110 is 170 μm, the width L1 of the transparent electrode 108 is 200 μm, and the arrangement pitch L2 of the transparent electrodes 108 is 230 μm. It goes without saying that the specific numerical values of the dimensions of each part are not limited to the above examples.

The plasma-addressed liquid crystal display unit 2 is provided with various necessary voltages depending on the structure of a screen display unit for displaying characters / symbols such as a reception channel number, volume display and menu display, and a switching power supply. Is provided with a power supply unit. In addition, the plasma addressed liquid crystal display unit 2
Processes the audio signal from the AV switch 20,
The audio processing unit for setting the sound quality / sound field, the audio output unit for amplifying the audio power, the speaker for converting an electric signal into a sound wave, and the like are provided.

Further, in the first embodiment, the plasma addressed liquid crystal display unit 2 is used as a large monitor device, but it may be the same as the video broadcast receiving unit 4 and may be a large television receiver 13.

As described above, the image display device 1 according to the first embodiment has the first signal selecting section 3 and the second signal selecting section 3 which are the signal selecting means.
Since the image corresponding to the video signal selected from the plurality of video signals is displayed on the plasma addressed liquid crystal display unit 2 which can be easily enlarged at a low cost by using the signal selection unit (HD / NTSC switch) 27 of While displaying a large image, it is lightweight, and the volume of each part other than the display part can be reduced, heat generation can be further suppressed, and image quality can be improved.

Next, the second embodiment will be described. In the second embodiment, as shown in FIG.
This is an image display device 50 for selecting and displaying a plurality of video signals from the video signal reproducing means and the video signal generating means by the first signal selecting section 3. This image display device 50 is also effectively used for presentations at exhibitions and the like. In addition,
In FIG. 8, the same components as those of the image display device 1 of the first embodiment shown in FIG. 1 are designated by the same reference numerals. The description of the same components denoted by the same reference numerals will be simplified.

The image display device 50 of the second embodiment differs from the image display device 1 of the first embodiment in that the liquid crystal display portion 51 is used instead of the plasma addressed liquid crystal display portion 2.

The liquid crystal display section 51 has a structure as shown in FIG. The configuration of the liquid crystal display section 51 is different from that of the plasma addressed liquid crystal display section 2 only in the liquid crystal driver 3
Instead of 1, the column driver 53 and the plasma driver 33
The row driver 54 is used in place of the above, and the liquid crystal panel 55 is used in place of the plasma addressed liquid crystal display 37.

The column driver 53 drives the liquid crystal panel 55 in the column direction. The row driver 54 drives the liquid crystal panel 55 in the row direction. The liquid crystal panel 55 has a structure such as a TFT system and displays an image.

That is, in the liquid crystal display section 51, with the liquid crystal panel 55 illuminated by the backlight 36,
The column driver 53 and the row driver 54 synchronize with each other at the timing of the respective drive signals supplied from the LCD controller 32. Then, an image signal is output from the liquid crystal panel 55 according to each pixel for each horizontal line sequentially driven by the row driver 54 and the image signal for each pixel to which the image signal level is supplied by the column driver 53.

As described above, the image display device of the second embodiment is
An image corresponding to a video signal selected from the plurality of video signals is displayed on the liquid crystal display unit 51 by using the first signal selection unit 3 and the second signal selection unit (HD / NTSC switch) 27 which are signal selection means. Since it is displayed, it is lightweight, and the volume of each part except the display part can be reduced, further suppressing heat generation,
Further, the image quality can be improved. Next, the third embodiment will be described. In the third embodiment, as shown in FIG. 10, a plurality of video signals from the video signal reproducing means and the video signal generating means are selected by the signal selecting section 3 and then converted by the scan converting section 62 for multi-monitor use. The plasma addressed liquid crystal display section 61a,
The image display device 60 displays images 61b and 61c. This image display device 60 is also effectively used for presentations at exhibitions and the like. Note that, also in FIG. 10, the same components as those of the image display device 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numerals. The description of the same components designated by the same reference numerals will be simplified.

The image display device 60 of the third embodiment differs from the image display device 1 of the first embodiment in that one video signal is supplied to three plasma addressed liquid crystal display portions 61a.
The point is that the display is divided into 61b and 61c.

The scan conversion unit 62 converts the scanning state of one video signal selected by the signal selection unit 63 or the video signal from the computer 9 by using an image memory or the like not shown, and outputs one video signal source. The signal from is supplied to the three plasma addressed liquid crystal display sections 61a, 61b and 61c.
Therefore, the image display device 60 of the third embodiment can display an image of a larger area.

The three plasma addressed liquid crystal display sections 61a, 61b and 61c may be three liquid crystal display sections.

Next, a fourth embodiment will be described. In the fourth embodiment, as shown in FIG. 11, a plurality of video signals from the video signal reproducing means and the video signal generating means are switched by the switch portion 72 to change the plasma address liquid crystal display portion 71a.
The image display device 70 displays images 71b and 71c. This image display device 70 is also effectively used for presentations at exhibitions and the like. Note that, also in FIG. 11, the same components as those of the image display device 1 of the first embodiment shown in FIG. 1 are designated by the same reference numerals. The description of the same components designated by the same reference numerals will be simplified.

The image display device 70 of the fourth embodiment is different from the image display device 1 of the first embodiment in that the three video signals are switched by the switch portion 72 and the three plasma addressed liquid crystal display portions 71a, The points are displayed on 71b and 71c, respectively.

For example, the plasma addressed liquid crystal display unit 71
a is a word processor or outline processor,
Characters, symbols, graphs, etc. using software such as spreadsheets
The explanatory text from the computer 73 that is creating the table or the like is displayed. A graph created by the computer 74 is displayed on the plasma addressed liquid crystal display unit 71b. On the plasma addressed liquid crystal display 71c, a moving image reproduced by decoding the code such as MPEG by the computer 75 is displayed.

Therefore, the image display device 70 of the fourth embodiment.
Using, you can display explanations, graphs, and videos in an organically related manner.

Of course, the three plasma addressed liquid crystal display sections 71a, 71b and 71c may be three liquid crystal display sections.

Next, a fifth embodiment will be described. In the fifth embodiment, as shown in FIG. 12, a plurality of video signals from the video signal reproducing means and the video signal generating means are switched by a switch part to display plasma addressed liquid crystal display parts 81a, 81.
The image display device 80 displays images b and 81c. The image display device 80 is also effectively used for presentations at exhibitions and the like.

In the image display device 80 of the fifth embodiment,
Operation parts 82a, 82b and 82c including video signal reproducing means and video signal generating means are provided so as to be integrated with the plasma addressed liquid crystal display parts 81a, 81b and 81c.

For this reason, the image display device 80 of the fifth embodiment does not require wiring, and the user can easily give a presentation, for example, by writing on a blackboard without being aware of the system configuration. This makes it possible for those who see the exhibition to visit as if they were looking at a normal exhibition panel, without being overwhelmed by the exaggerated system.

Next, a sixth embodiment will be described. In the sixth embodiment, as shown in FIG. 13, a plurality of video signals from the video signal reproducing means and the video signal generating means are switched by a switch part to display plasma addressed liquid crystal display parts 94a, 94.
The image display device 90 displays images b and 94c. The image display device 90 is also effectively used for presentations at exhibitions and the like.

In the image display device 90 of the sixth embodiment,
Plasma address liquid crystal display section 94a, 94b, 94c
And the operation unit 91 including the video signal reproducing means and the video signal generating means are provided separately, and the video signal is wirelessly communicated via the transmitting antenna 92 and the receiving antenna 93.

Therefore, by using the image display device 90 of the sixth embodiment, the explainer can concentrate on the presentation and concentrate on the presentation without being bothered by the operation of the device. Further, the plasma addressed liquid crystal display unit 9
The display unit composed of 4a, 94b, and 94c is the operation unit 9 described above.
Since it is divided into 1, the weight reduction is achieved and the design is excellent. Further, since the operation section 91 is separated, it becomes possible for a person in charge of special operation to operate it at another place.

In the image display devices 80 and 90 of the fifth and sixth embodiments, the plasma addressed liquid crystal display portion is used as the display portion, but liquid crystal display may be used.

[0068]

In the image display device according to the present invention, the signal selecting means selects a desired video signal from the video signals output by the video signal reproducing means and the video signal generating means, and the liquid crystal is displayed in accordance with the video signal. Since the flat plate type display means used forms and displays an image, it is possible to realize miniaturization as compared with an apparatus using a cathode ray tube or the like.

Further, in the image display device according to the present invention, there is provided a plasma addressed liquid crystal display portion for controlling the liquid crystal through which light passes through the flat panel display means by plasma to form and display an image corresponding to the video signal. By doing so, a large screen can be realized at low cost.

The image display device according to the present invention further comprises a scan conversion means for converting the scan state of a single video signal,
Of the outputs of the video signal reproducing means and the video signal generating means, the singular number selected by the signal selecting means is divided and displayed on the plurality of flat panel display means, so that it is possible to realize a large display with excellent functionality. .

Further, since the image display device according to the present invention supplies the video signals output by the plurality of video signal reproducing means and the plurality of video signal generating means to the plurality of flat panel display means, various information is provided. Can be displayed uniformly. in this case,
If the plurality of flat type display means, the plurality of video signal reproducing means and the plurality of video signal generating means are integrated, no wiring is required and the user writes characters on the blackboard without being aware of the system configuration. You can easily give a presentation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of an image display device according to the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a plasma addressed liquid crystal display unit used in the first embodiment.

FIG. 3 is a block diagram showing a detailed configuration of an NTSC demodulation double speed conversion circuit of the plasma addressed liquid crystal display unit.

FIG. 4 is a block diagram showing a detailed configuration of an LCD controller of the plasma addressed liquid crystal display unit.

FIG. 5 is an exploded perspective view schematically showing the structure of the plasma addressed liquid crystal display of the plasma addressed liquid crystal display unit.

FIG. 6 is a schematic diagram for explaining a switch operation by plasma discharge of the plasma addressed liquid crystal display having the structure shown in FIG. 5;

FIG. 7 is an enlarged view of the plasma addressed liquid crystal display having the structure shown in FIG.

FIG. 8 is a block diagram showing a schematic configuration of a second embodiment of the image display device according to the present invention.

FIG. 9 is a block diagram showing a detailed configuration of a liquid crystal display unit used in the second embodiment.

FIG. 10 is a block diagram showing a schematic configuration of a third embodiment of the image display device according to the present invention.

FIG. 11 is a block diagram showing a schematic configuration of a fourth embodiment of the image display device according to the present invention.

FIG. 12 is an external perspective view showing the schematic configuration of a fifth embodiment of the image display device according to the present invention.

FIG. 13 is an external perspective view showing a schematic configuration of a sixth embodiment of the image display device according to the present invention.

[Description of Reference Signs] 1 image display device 2 plasma addressed liquid crystal display unit 3 first signal selection unit 4 video broadcast receiving unit 5, 6 video tape recorder 7 multi-disc player 8 video CD player 9 computer 10 NTSC conversion circuit 11 game machine

Claims (9)

[Claims] 1. An image display device for displaying light on a liquid crystal from the rear side to display an image corresponding to a video signal, wherein a video signal reproducing means for reproducing the video signal and a video signal generating means for generating the video signal. A signal selecting means for selecting a video signal output from the video signal reproducing means and the video signal generating means; and a flat plate for forming and displaying the image according to the video signal selected by the signal selecting means. An image display device comprising a mold display means. 2. The image display device according to claim 1, wherein a plurality of the video signal reproducing means and the video signal generating means are provided. 3. The flat panel display means is a plasma addressed liquid crystal display section for controlling liquid crystal through which light is transmitted by plasma to form and display an image according to the video signal. 1. The image display device according to 1. 4. A plurality of the flat panel display means are provided, and one of the outputs of the video signal reproducing means and the video signal generating means selected by the signal selecting means is divided into the plurality of flat panel display means. 2. The image display device according to claim 1, further comprising scan conversion means for converting the scanning state of the single video signal so as to display. 5. The image display device according to claim 4, wherein the plurality of flat panel display means, the video signal reproducing means and the video signal generating means are integrated. 6. The plurality of flat panel display devices is a plasma addressed liquid crystal display unit that controls a liquid crystal through which light passes by plasma to form and display an image according to the video signal. The image display device according to claim 4. 7. The image display device according to claim 1, wherein the video signals output from the plurality of video signal reproducing means and the plurality of video signal generating means are supplied to the plurality of flat panel display means. 8. The image display device according to claim 7, wherein the plurality of flat panel display means, the plurality of video signal reproducing means, and the plurality of video signal generating means are integrated. 9. The flat panel display device is a plasma addressed liquid crystal display unit for controlling liquid crystal through which light is transmitted by plasma to form and display an image according to the video signal. The image display device according to claim 7.