JPH08125956A - Display device and video display system - Google Patents

Abstract

PURPOSE: To view different video images with improved separation depending on different observation positions and directions regardless of the same display screen and to view them with image quality for which luminance is uniform in a display device used for a video telephone and a video conference system, etc. CONSTITUTION: The display screen 100 provided with microperspectively small dispersion angle characteristics for incident light and provided with a light convergence function over the entire screen is used. On the same display screen 100, projection and display are performed from plural projection devices 11, 12 and 13 whose projection angles are different. In this case, projection angle differences ϕ12 and ϕ23 among the projection devices 11, 12 and 13 are compared with the dispersion angle 2δ of the display screen and the dispersion angle 2δ is set to be smaller. By the setting and the light convergence function, the separation in the case of separating and observing respective projection video images in plural observation areas 17, 18 and 19 whose observation directions are different is improved. Also, by converging projection light into the observation direction by the light convergence function, screen peripheral luminance is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device used in a video conference, etc., and when displaying multiple images taken from different positions or different directions, the sense of being in the same space depending on the viewing position of the displayed images. The present invention relates to a display device and a video display system that allow a user to view an image that reproduces the shooting position or shooting direction through a display device.

[0002]

2. Description of the Related Art In recent years, two-way video communication such as a TV telephone and a TV conference system in which remote locations are connected by a video / audio communication network has rapidly spread due to the development of communication technology such as image coding technology. . In the future, it is expected that a more realistic video service will be provided by enhancing the ISDN network and increasing the bandwidth of the transmission network.

In the case of a video conference, since not a one-to-one conversation but a large number of people having a conversation with each other, it is important to match the line of sight of a plurality of interlocutors.

Referring to FIG. 9, the current TV between the two points I and J
The case of a meeting is described. At each of the points, one to a plurality of image capturing devices and display devices are installed, and the image capturing device at the point I and the display device at the point J correspond to each other, and the image capturing device at the point J and the display device at the point I are provided. It corresponds. For convenience, at the point J, the interlocutors A, B, and C in front of the image capturing device are captured,
Interviewer A on display devices I1, I2, I3 at point I,
A case where B and C are individually displayed will be described. The interlocutors X, Y, Z in front of the display devices I1, I2, I3 at the point I are
By looking at the display devices I1, I2, and I3, the conversations with the interlocutors A, B, and C at the point J will be discussed. For example,
When the interlocutor X interacts with B, the interlocutor X uses the display device I.
2, the interlocutor B sees the image of the profile of the interlocutor X on the display device J1.
Is looking at the display device J1, the interlocutor X will see an image of the side profile of B on the display device I2, and will interact with each other without keeping their line of sight. Also, when the interlocutors Y and Z look at the display device I2, the above-mentioned B
Will see the profile looking at X. Thus, when a plurality of interlocutors at different positions see the same display device I2, they will see the same image from that device.
The reality is that it is far from the feeling of having a meeting in the same place.

As a method of preventing the lines of sight of fellow interlocutors from shifting in this way and making the lines of sight of plural interlocutors match, "a scattering angle of light or a degree of scattering of light depending on the projection angle of light on the display screen. By using screens having different functions "and" projecting and displaying on the display screen from a plurality of projection devices having different projection angles ", the interlocutor in front of the display screen displayed interlocutors at other points. A device that allows face-to-face conversation through a display device is proposed in Japanese Patent Application No. 5-190689. Further, in Japanese Patent Laid-Open No. 6-253303, as a specific example of the display screen, semi-transmission with strong directivity, in which the transmitted light luminance distribution showing the degree of scattering of transmitted light from the projection device shows a peak at a specific observation angle. A diffuser plate and a visibility control plate having a property of scattering light in a specific incident direction and transmitting light in another incident direction are shown. On screens using these semi-transmissive diffuser plates and view control plates, multiple images are observed as the images other than the projected image of interest leak out as the screen approaches the peripheral area, or the display brightness of the peripheral area of the screen changes. In order to eliminate the drawbacks such as the decrease, Japanese Patent Application No. 5-190689 uses a convex lens for condensing the projected image light that has spread radially and making it enter the screen.

[0006]

However, in the case of using a semi-transmissive diffusion plate as a "screen having a function of varying the light scattering degree depending on the incident angle of light", the dispersion according to the projection angle and the observation angle is used. It was difficult to easily make a diffuser plate with an angle, and it was not easy to realize a screen that was set at an arbitrary viewing angle. Further, when the view control plate as "a screen having a function in which the degree of light scattering varies depending on the incident angle of light" is used, the scattering direction of the projected light as the display image is one-dimensional, and the display screen is Since the display has a zonal luminance, it is necessary to use the above-mentioned semi-transmissive diffuser plate together, and in the end, it is easy to manufacture the semi-transmissive diffuser plate having an arbitrary dispersion angle as described above. Was not.

The present invention has been made to solve the above-mentioned drawbacks, and an object thereof is to enable the line-of-sight matching of a large number of interlocutors in a TV telephone, a TV conference system, etc. It is an object of the present invention to provide a display device and a video display system that can improve the image quality of an image, and that can display different images with good separability depending on different observation positions and different observation directions despite the same display surface.

[0008]

In order to achieve the above object, in the display device of the present invention, the invention according to claim 1 has a dispersion angle characteristic that is microscopically small with respect to incident light,
Further, it comprises a display screen having a light collecting function over the entire screen and a plurality of projection devices for projecting an image on the display screen, and the dispersion angle of the display screen is larger than the projection angle difference between the projection devices. The projection angle difference between the plurality of projection devices is set so as to be smaller and the projection display is performed on the display screen.

Further, in the above structure, in the invention of claim 2, the display screen is composed of one or a plurality of convex lenses and a diffusion sheet constituted by arranging minute convex lenses on one surface. It is characterized in that the projected image light is input to the diffusion sheet after passing through at least one of the convex lenses.

Further, in the above structure, in the invention of claim 3, the display screen is composed of one or a plurality of convex lenses and one or a plurality of lenticular lenses, and at least image light projected and displayed. It is characterized in that the light is passed through one of the convex lenses and then input to the lenticular lens.

Further, in the configuration of the invention of claim 3,
The invention of claim 4 is characterized in that the lenticular lenses are combined in a plurality of directions so that the incident light is dispersed in two or more directions among the horizontal direction, the vertical direction, and the oblique direction.

On the other hand, in order to achieve the above-mentioned object, in the image display system of the present invention, in the invention of claim 5, the display device described above is used and images are taken by a plurality of image taking devices having different directions of image taking. An image of the subject is transmitted to a plurality of projection devices in the display device, and the plurality of images are projected and displayed on a display screen while changing a projection angle.

Further, according to the invention of claim 6, when the same display screen is observed from different angles using the display device described above, an independent sound field is provided in accordance with each observation region, and each observation region is provided. According to the invention of claim 7, when the same display screen is observed from different angles using the display device described above, one of the sounds is provided separately according to the image to be viewed. The common image is input to the one projection device and projected so that the same common image as the other observation region can be seen in the observation region and the individual image not visible in the other observation region can be seen in the other observation region. In addition, after superimposing the respective video signals of the common image and the individual image on the other projection device having a different projection angle, they are input to the other projection device for projection display, or And displaying superimposed common image and the individual images on the same display screen by a plurality of projection devices from one projection angle.

Further, according to the invention of claim 8, when a display image on the same display screen is observed by using the above-mentioned display device, it can be seen by a person in one of the observation areas.
It is characterized in that the observation angle between the two observation regions with respect to the display screen is set to be larger than the dispersion angle of the display screen so that it cannot be seen by a person in the other observation region.

[0015]

In the invention of the display device according to claim 1 of the present invention,
By providing a microscopic dispersion angle characteristic of the display screen, comparing the projection angle difference between the projection devices and the dispersion angle of the display screen, and setting the dispersion angle smaller, and the condensing function of the display screen. This prevents the projected images projected and displayed from a plurality of projection devices having different projection angles from being dispersed and overlapping, thereby improving the separability of the projected images. In addition, the light condensing function of the display screen collects the dispersed light around the display screen in the observation direction, thereby increasing the brightness around the screen and improving the image quality.

In the invention of the display device according to claim 2 and claim 3 of the present invention, a plurality of images projected and displayed on the display screen are condensed in the direction of the observer by the condensing function of the convex lens, and the screen surface is displayed. The display brightness of is made uniform. In addition, in the second aspect, the microlens diffusion sheet that disperses the incident angle of the light as the center and the lenticular lens that disperses the incident angle of the light as the center in the third aspect perform projection display from a plurality of projection devices having different projection angles. A plurality of projection images can be displayed separately in the direction corresponding to the projection angle. That is, the microscopic dispersion angle characteristic is easily realized by the diffusion sheet or the lenticular lens, and the condensing function is easily realized by the convex lens.

In the invention of the display device according to claim 4 of the present invention, in the lenticular lens forming the display screen, at least a plurality of lenticular lenses are arranged so as to disperse the incident light in a horizontal direction, a vertical direction, an oblique direction and the like. By combining them in different directions, for example, in a lenticular lens used for horizontal dispersion, the dispersion angle is adjusted to the difference in the projection angle to enhance the separability of the display images viewed by multiple viewers at different viewing angles, With a lenticular lens used for directional dispersion or oblique dispersion, the divergence angle can be set independently by each lenticular lens, for example, by setting the divergence angle according to the range of the height viewed by a plurality of observers. As a result, the scattering direction of the projection light, which is the display image, is two-dimensionally expanded to obtain a wide display image.

In the invention of the video display system according to claims 5 to 8 of the present invention, by using the display device of claims 1 to 4, the same display video can be seen from any direction. In contrast to the display device described in (1), the viewers should see images that are separated according to the position of the photographer so that each observer in a different observation area can see images that correspond to different roles, such as the presenter and the audience. To be able to carry out each role. Furthermore, the displayed image content and the observation purpose of each observer are matched so that different purposes and actions can be completed in the same place.

As described above, in the display device and the image display system of the present invention, the plurality of images projected on the display screen by the plurality of projection devices having different projection angles are the same in different directions from different positions by the plurality of photographing devices. When the captured image of the subject is applied, by viewing the image displayed on the display device from different positions, that is, from different angles, the angle at which the subject is captured at the point where the image capturing device is installed and the display device. Corresponds to the viewing angle of the displayed image at the point where
The feeling of seeing the subject directly, that is, the same place (real space)
Get the feeling of being in Furthermore, when people with different purposes see the same screen from different locations in the same place, they can see the video that matches their purpose, and even if they are in the same place and on the same screen, they can be kept private. To be able to observe various images.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of an image display system using a display device of the present invention, in which images of an object photographed by a plurality of photographing devices with different directions are transmitted to a plurality of projection devices. This is an embodiment in which a plurality of images are projected and displayed on the display screen by changing the projection angle, and an image in a video conference of a plurality of interlocutors will be taken up and described as an image projected and displayed on the same display screen. For simplification of the explanation, the meeting between the two points I and J is taken up, and the point J
The case of displaying the video imaged at 1. at point I will be described. Actually, since it is bidirectional video communication, it is also necessary to display the image captured at the point I at the point J. In the description of the present embodiment, the points J and I may be exchanged and considered in the same manner.

At the point J, photographing devices (a _C , b _L ), (a _R , b _C , c _L ), (b _R ) for photographing the interlocutors A, B, C, which are subjects, in different directions. , C _C ). Here, the subscript _C of the imaging device indicates that the front direction is taken, the subscript _L indicates that the left direction is taken, and the subscript _R indicates that the right direction is taken. Further, a, b and c are J of the display device.
The installation position of the imaging device corresponding to 1, J2, and J3 is shown.

A plurality of projection devices I1, I2, I3 located at the point I are images of the subject photographed by the plurality of imaging devices at the point J.
To the respective display screens S1, S2, S
The image is displayed on 3. In this case, as shown in FIG. 2, the same subject (interlocutors A, B, C) is captured by a plurality of image capturing devices i.
_K (i = a, b, c, K = L, C, R), and a plurality of images of the same subject are projected by the projection devices P _iK (i) of the display devices I1, I2, I3 at other points. = A, b,
c, K = L, C, R) display screens S1, S
2, S3 multiple projection / display. The projection angle difference φ between the projection devices P _iK is the dispersion angle 2δ of the display screen described later.
To be larger than

The correspondence between the photographed image, the projection device P _iK, and the display screens S1, S2, S3 will be described. An image obtained by photographing the subject A with the photographing devices a _C and b _L is displayed on the display screen S1 by the projection devices P _aC and P _bL , the subject B is displayed on the display screen S2 by the projection devices P _aR , P _bC and P _cL , and the subject C is displayed. The projection devices P _bR and P _cC are made to correspond to the display screen S3 and displayed. Here, the image projected and displayed by the projection device P _iK is “projection device P _iK ”.
_Image capture device i at another location with the same name as the _iK subscript _iK
Image from _K (i = a, b, c, K = L, C, R) ”. Display screens S1, S2, S3 of the projection device P _iK
The subscript _C indicates that the image is projected vertically to the back surface of the display screen, the subscript _L indicates that the image is projected from the left direction, and the subscript _R indicates that the image is projected on the back surface of the display screen. .

In the above embodiment, when the display device of the present invention is combined with the photographing device, a TV conference is specifically described as an example. Here, two or three photographing devices having different directions are installed at the same installation position, and correspondingly, two or three projection devices for projecting an image on the same display screen are installed.
Although this is a case where a table is installed, the number of shooting directions and the number of projection directions are not limited to 2 or 3 in the present invention.

The display device of the present invention is not particularly limited to a video conference. By projecting and displaying a plurality of images on the same display screen while changing the projection angle, and by sandwiching the display screen and looking at the display screen from the direction corresponding to the projection angle, the images can be displayed separately. In the above embodiment, the case where the plurality of images projected on the same display screen are different images has been described. When these images are the same, the same image can be viewed even if the viewing angle at which the display screen is viewed is different, and an effect equivalent to that when the viewing angle of the display screen is widened can be obtained. Therefore,
The type of image projected and displayed on the same display screen is not particularly limited.

A second embodiment of a video display system using the display device of the present invention is shown in FIG. Different images are projected and displayed on the display screen 100 by the projection devices 11, 12, and 13, and these images are observed in the observation areas 17, 18, 19.
It is the figure which looked at the Example of the display of the present invention observed from above from above. In the display device of the present invention, different images can be seen when the same display screen 100 is viewed at different viewing positions and viewing angles.
Observation areas 1 for persons B, A, and C in 8 and 19 using headphones or a spot zone speaker having high directivity.
Independent sound fields 40, 41, 4 according to 7, 18, 19
2 is provided, and the sound according to the image is separately provided. Without creating partitions for each image in the same place,
The observer is divided into groups such as sex, age group, generation group, interest group, and purpose group in each observation area with sound field 17, 18, 19, and the image and sound are recorded according to each group. They are provided separately as a set. Therefore, the display device of the present invention can be suitably applied to a display corridor for display.

A third embodiment of a video display system using the display device of the present invention is shown in FIGS. 4 (a) and 4 (b). Different images are projected and displayed on the display screen 100 by the projection devices 11 and 13, and these images are observed in the observation areas 17 and 1.
It is the figure which looked at the Example of the display of the present invention observed from 9 from the upper part.

A person B in the observation area 17 is a large number of listeners at a lecture or the like, and a person C in the observation area 19 is a speaker or a presenter. In FIG. 4A, the image viewed by the lecturer C cannot be seen by the listener B. Therefore, in addition to the image viewed by the listener B, an oral manuscript or the like required at the time of presentation is superimposed, The superimposing video signal 60 can be presented while being displayed on the display screen 100 by the projection device 13. Further, in FIG. 4B, the projection device 1
It is possible to make a presentation while superimposing and displaying the video signals 61 and 62 of the video seen in B and the video desired to be seen only in C from the same angle as that of 3 on the display screen 100 by the plurality of projection devices 13 and 13 ′.

FIG. 5 shows a fourth embodiment of a video display system using the display device of the present invention. In the second and third embodiments, the center of the back of the screen (projection device 12) and the left (projection device 1) are arranged so that the images are separated in the horizontal direction of the display screen.
1), the display image is projected from the right (projection device 13) direction, but in the fourth embodiment, it is separated on the back side of the display screen 100 (projection device 14) so as to be separated in the vertical direction of the display screen 100. Alternatively, a display image is projected from below (projection device 16), and the projection device 16 projects and displays it on the display screen 100, and these images are viewed in the observation area 21. It is the figure seen from the one. A person B in the observation area 20 is a large number of listeners such as a lecture, and a person C in the observation area 21 is a speaker or a presenter. C can make a presentation without displaying it to the audience B while displaying an oral manuscript or the like necessary for the presentation on the display screen 100. That is, the display device of the present invention can be implemented as a prompter. The person B in the observation area 20 can see the display image from the projection device 14 above the back of the screen, but when this image is unnecessary, the projection device 14 is not installed or the projection device 14 is OF.
It may be set to F and only the display image from the projection device 16 viewed by the person C in the observation area 21 may be projected. This fourth
In the embodiment, the viewing angle difference θ at which the people in the viewing areas 20 and 21 observe the display screen 100 is displayed.
It is necessary to set so that it is larger than the dispersion angle of the diffusion sheet and the lenticular lens that form the display screen 100, and this observation angle θ is the projection angle difference φ between the projection devices 14 and 16. It is clear that it almost agrees with.

The display device used in the above video display system will be described below.

As an embodiment of the display device according to claim 1 of the present invention, it has a dispersion angle characteristic that is microscopically small with respect to incident light,
In addition, the three projection devices 11, 12 are provided behind the display screen 100 having a light collecting function over the entire screen.
FIG. 6 shows a case in which 13 is arranged at a position satisfying the light condensing function, and images in three directions are displayed on the display screen 100 from the projection device. In general, a projected image from a projection device is displayed on the display screen 100 as projected light that is spread radially.
Is incident on. When the angle from the projection optical axes 50, 51, 52 of the projection devices 11, 12, 13 and the normal to the display screen 100 is taken as the projection angle, the projection device 1 shown in FIG.
Projection image light beams are multiply projected on the display screen 100 at different projection angles φ ₁ , φ ₂ , φ ₃ (not shown) from ₁ , ₁₂ , and ₁₃ . The projected images from the respective projection devices 11, 12, 13 are made to enter the screen 100 as radial rays and are made into projection light parallel to the optical axes 50, 51, 52 by the "condensing function over the entire screen" of the display screen. After that, or after the projection light is condensed to some extent toward the optical axes 50, 51, and 52, the individual projection video rays are centered on the incident angle due to the "microscopically small dispersion angle characteristic" of the display screen 100. And are emitted to the respective observation regions 17 to 19
In, the image can be observed up to the peripheral part of the screen as each image without a decrease in brightness. Incidentally, the projection angle difference phi _ij between different projection apparatus (FIG At 6 projecting device 11 and 12 between the phi _12, projection device 12 and 13 between the phi _23), when the angle of dispersion 2.delta. Display screens, phi _ij> 2.delta. By doing so, it is possible to separate and observe the incident lights from each other, and to selectively separate and observe one image from each projected image, there is no double or triple image overlap, in other words, cross You can observe images without talk. Another function of the above-mentioned "condensing function over the entire screen" is to suppress the spread of the image due to the dispersion and further enhance the separability of the image.

Next, the display of the display device of the present invention displays a plurality of kinds of images on the same display screen from a plurality of directions and separates and displays the plurality of kinds of images projected on the display screen according to the viewing direction. The screen will be described. As described above, the display screen of the display device of the present invention "has a microscopically small dispersion angle characteristic with respect to incident light and has a light condensing function over the entire screen."
First, a specific embodiment for realizing the former "dispersion angle characteristic" will be described in detail below with reference to the drawings.

FIG. 7A is an explanatory view of a diffusion sheet (microlens diffusion sheet) constituted by arranging minute convex lenses which compose the display screen of the display device of the present invention. (B) is explanatory drawing of a wrench killer lens. Incident light 2 that is perpendicularly incident on the surface opposite to the lens surface of the microlens diffusion sheet 1 or the lenticular lens 1 ′ spreads from the lens surface to outgoing light 3 to 4, and emerges on the extension line of the light ray inside the lens of the incident light 2. The emitted light 5 is dispersed and emitted. Further, the incident light 6 that is obliquely incident spreads from the lens surface to the emitted lights 7 to 8, and is dispersed and emitted from the emitted light 9 on the extension line of the light ray in the lens of the incident light 6. These outgoing lights 3 to 4 and 7 to 8 show the spread of the outgoing light,
This spread is called the dispersion angle 2δ. This dispersion angle 2
δ is determined by the refractive index N of the lens, the radius of curvature r of the lens, the lens pitch 2H, and the incident angle. If the dispersed outgoing lights do not overlap each other, the outgoing lights 7 to 8 cannot be seen from the position where the outgoing lights 3 to 4 are viewed from the front, and the outgoing lights 7 to 8 cannot be seen.
The emitted lights 3 to 4 cannot be seen from the position where the toes 8 are viewed from the front. Therefore, the angle difference φ _ij between the incident light rays and the dispersion angle 2δ of the microlens diffusion sheet or the lenticular lens
Then, by setting φ _ij > 2δ, the incident lights can be separated and observed. In this way, the microlens diffusion sheet and the wrench killer lens have a narrow dispersion angle 2δ,
It can be used as a directional diffuser plate that has a diffusion property that can be limited.

In the microlens diffusing sheet shown in FIG. 7A, fine convex lenses are aligned vertically and horizontally, but it is not necessary to align them. It may be arranged at random.

Next, the latter of the characteristics that "incident light has a microscopically small dispersion angle characteristic and has a light condensing function over the entire screen" of the display screen of the display device of the present invention An embodiment for realizing the "light collecting function" will be described. As an example thereof, as shown in FIG. 7C, one or a plurality of convex lenses 10 and 10 ′ having a light condensing function are used, and the combined focal length of these lenses is set to the projection distance from the lens to the projection device. Approximately, at least one (10) is arranged in front of the microlens diffusion sheet 1 or the lenticular lens 1 ′, or the condensing function of the convex lens is divided to form the diffusion sheet 1 or the lenticular lens 1 ′. You may arrange | position the convex lenses 10 and 10 'back and front. Also,
As another example, a Fresnel lens having the function of a convex lens can be used as in the above. When one of these convex lenses or the like is arranged in front of the diffusion sheet 1 or the lenticular lens 1 ′, it may be integrally formed on the front surface thereof. Further, when moire occurs in an observed image due to a projection device or the like using a liquid crystal element, it is effective to provide a gap between the convex lens or the like and the diffusion sheet 1 or the lenticular lens 1 ′. The condensing function realized by these convex lenses and the like plays a role of improving the brightness around the screen as described above and a role of improving the separability of a plurality of images with different projection angles.

In the lenticular lens shown in FIG. 7B, lens surfaces of partial cylinders are arrayed in the vertical direction, and the dispersion angle is in the horizontal direction orthogonal to this array, and projection between a plurality of projection devices is performed. The difference in angle was in the horizontal direction orthogonal to the arrangement of the lens surfaces, and the observation region of the separated image was also in the horizontal direction orthogonal to the arrangement of the lens surfaces. The ratio of the image brightness from the projection device and the projection light brightness is usually 1/100 or more, but since one transparent lenticular lens does not have vertical diffusivity, part of the leak projection light is used as a light emitting part. It will be observed. For this reason, the projected image light and leakage projection light are vertically (up and down).
As a method of observing only the image correctly by dispersing it in a diagonal direction or by adding a diffusing agent to the lenticular lens material,
It is necessary to disperse in the longitudinal direction or the oblique direction by roughening the surface a little or using a diffusion sheet having a weak diffusivity.

On the other hand, the lenticular lens 1 constituting the display screen of the display device according to claim 3 is used as the display screen for the display device according to claim 4, which has a diffusibility in the vertical direction or the like. Example in which a lenticular lens 1 ″ having partially cylindrical lens surfaces arranged laterally and a lenticular lens 1 ″ having partially cylindrical lens surfaces arranged diagonally are added to Figure 8
Shown in (a) and (b). This wrench killer lens 1 ''
The lenticular killer lens 1 ′ ″ has a different purpose from the lenticular killer lens 1 ′ that separates the projected images from the horizontal multiple directions, and the projected image is in the vertical direction bb ′ and the projected image is in the oblique direction c.
c'is dispersed. Wrench killer lens 1 '
On the other hand, a convex lens or the like 10 is arranged on the incident surface side, and lenticular lenses 1 ″ and 1 ′ ″ are arranged on the exit side to form the display screen 100. In this example,
In the three projection devices 11, 12, and 13 installed by changing the projection angle in the horizontal direction aa ′, the projection angle in the vertical direction bb ′ is the same. The dispersion angle of the lenticular lens 1 ″ in the vertical direction bb ′ may be set according to the observation angle at which the observer can observe the image in the vertical direction. The purpose is different from the dispersion angle of the lenticular lens 1 ′ and is independent. Therefore, different angles can be easily set, and further, it plays a role of dispersion of the leak projection light.

The interlocutor 101 shown in FIG.
Optimum direction angles γ ₁ and γ ₃ of the heads of the lenses 102 and 103 (angles from the normal direction of the surface of the screen 100) and the projection angle differences φ ₁₂ and φ ₂₃ between the three projection devices 11, ₁₂ and 13.
However, they do not necessarily have to be completely the same, and may be set within the margin of the dispersion angle 2δ in FIG.

In the above description, the image is projected directly from the projection device to the display screen.
Obviously, a reflecting mirror may be installed between the projection device and the display screen to project.

In the video communication by the display device of the present invention, the case of a video conference between two points or three points was taken up for simplification of explanation, and it was explained that the lines of sight of the other parties to be discussed can be the same. It does not limit the number of communication points.

In this embodiment, the case where there is one interlocutor in front of each display screen has been described with reference to the drawings, but the number of interlocutors is not particularly specified.

In the first embodiment of the video display system, the number of installation positions of the photographing devices and the number of display screens at each point are described as three, but the number is not particularly limited. The number may be arbitrarily set in consideration of the number of projection devices that project and display different projection angles on the same display screen, the number of display screens, and the number of installation points of imaging devices.

In the first embodiment of the image display system, the images taken by the interlocutors of the video conference are used as the plurality of images projected by the projection device with the projection angle changed on the same screen. . Therefore, by making the direction in which the display device is viewed correspond to the direction in which the interlocutor is imaged from the imaging device, it is possible to realize realistic image communication as if the interlocutor is viewed from the installation point of the imaging device.

The first embodiment of the video display system has been described based on the video conference system of a plurality of interlocutors, but the present invention is not limited to the video conference system. In the point-to-point communication, when viewing images from different viewpoints through a display device at different points, the direction in which the display device is viewed corresponds to the direction in which the subject is photographed by the photographing device. In other words, the photographing device is installed. It realizes realistic video communication as if the subject is viewed from a point.

The video display system using the display device of the present invention is not limited to the bidirectional video communication such as the video conference as in the above-mentioned embodiment, but as in the first to fourth embodiments, Project multiple images on the same display screen with a projection device that changes the projection angle, and observe each image separated from the multiple images despite the same screen depending on the viewing position and angle of the display screen. It can be applied not only as a display device for a lecture hall, a lecture room, a theater, a video room, an exhibition room, etc., but also as a display device for producing a background image.

[0047]

As described above, according to the display device of the present invention, a display screen having a small dispersion angle characteristic by a microlens diffusion sheet, a lenticular lens, etc., and a condensing function by a convex lens, etc. is used. By displaying a plurality of images on the same display screen by a plurality of projection devices with different projection angles, when viewing the display image on this display screen from different positions and different angles,
Despite the same screen, the projected image from the projection device with the projection angle corresponding to the viewing angle can be viewed separately, and the image can be viewed as a separated image with uniform display brightness on the screen. . Therefore, if, for example, an image obtained by photographing the same subject in different directions from different positions by a plurality of photographing devices in a remote place is applied to the plurality of images, it is as if from the point where the photographing device is installed, You can see the display image with a high sense of reality as if you were looking directly at it.

In the display device of the present invention, in the lenticular lens forming the display screen, at least the lenticular lenses are combined in a plurality of directions in order to disperse the incident light in the horizontal direction, the vertical direction and the oblique direction, and their dispersion angles are set. On the one hand, by setting
It is possible to enhance the separability of the display images viewed by a plurality of observers at different viewing angles, and on the other hand, the scattering direction of the projected light, which becomes the display image according to the heights of a plurality of observers, is two-dimensional. In addition, the leaked projection light is dispersed and its brightness is lowered, and a wide display image can be obtained.

Therefore, in a video display system using the display device of the present invention as a display device for two-way video communication such as a video conference, the front person is staring at the front image with the interlocutor in front of him, and the diagonally front side. With the interlocutor, in the same way as the actual dialogue, in order to make a dialogue by matching the line of sight with the movement of the body such as moving the neck and body toward the interlocutor, it is present in front of the eyes even though the image is being viewed. You can enjoy the feeling of interacting in the same place. That is, it is possible to give the user a feeling of interacting in the real space (same place) on the display device.

Further, in the display device of the present invention, a plurality of images are projected on the same display screen by a projection device having different projection angles, and different viewing positions are displayed despite the same display surface.
Since it is possible to provide a display device in which different images can be seen separately by different viewing directions, it is possible to create a unique display space that is isolated from people in other positions, and each can create an independent image space. Despite the same display screen, it can be used as an independent display for viewing private images, and is an effective display device when displaying images that should not be seen by people in other positions.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a video display system when applied to bidirectional video communication as a first embodiment of a video display system of the present invention.

FIG. 2 is a diagram illustrating projection from a plurality of projection devices onto a display screen of the present invention.

FIG. 3 is a diagram showing the configuration of an isolated original audiovisual space as a second embodiment of the video display system of the present invention.

FIGS. 4 (a) and 4 (b) show, as a third embodiment of the video display system of the present invention, the video viewed by the lecturer must be unique to the listener, except for the video viewed by the listener. Diagram showing the structure when making the image visible

FIG. 5 is a diagram showing a configuration of a video display system according to a fourth embodiment of the present invention when it is applied to a display such as a prompter in which an image viewed by a speaker is invisible to an audience.

FIG. 6 is a view showing how the three-direction projection image light is separated and reaches the observation region due to the condensing function over the entire screen of the display screen and the microscopically small dispersion angle characteristic in each of the embodiments of the present invention. Illustration to explain

FIG. 7 (a) is a display screen used in each of the embodiments of the present invention, in which minute convex lenses are arranged on one surface as an embodiment for realizing a microscopically small dispersion angle characteristic. Diffusion sheet (microlens diffusion sheet)
FIG. 6B is a diagram for explaining a lenticular lens as an example that realizes a microscopically small dispersion angle characteristic in the display screen used in each of the above-described embodiments of the present invention, and FIG. FIG. 3 is a diagram illustrating an arrangement example of a convex lens that realizes a light collecting function.

8A and 8B are views showing another embodiment of the display screen used in each of the above embodiments of the present invention.

FIG. 9 is a diagram showing a conventional remote communication conference (video conference) of a plurality of interlocutors using video images between two points I and J.

[Explanation of symbols]

I1, I2, I3, J1, J2, J3 ... Display device S1, S2, S3 ... Display screen φ, φ _ij ... Projection angle difference θ ... Observation angle difference 2δ ... Display screen dispersion angle i _K (i = a, b , C, K = R, C, L) ... Imaging device P _iK (i = a, b, c, K = R, C, L) ... Projection device A, B, C, X, Y, Z ... Interactor DESCRIPTION OF SYMBOLS 1 ... Micro lens diffusion sheet 1 ', 1'',1''' ... Lenticular lens 2, 6 ... Incident light 3, 4, 5, 7, 8, 9 ... Emitting light 10, 10 '... Convex lens 11, 12 , 13, 13 ', 14, 16 ... Projection device 17, 18, 19, 20, 21 ... Observation area 40, 41, 42 ... Sound field 50, 51, 52 ... Projection optical axis 60 ... Superimposed video signal 61, 62 ... Video signal 100 ... Display screen 101, 102, 103 ... Example of observation video

Claims (8)

[Claims] 1. A display screen which has a microscopically small dispersion angle characteristic with respect to incident light and has a condensing function over the entire screen, and a plurality of projection devices for projecting an image on the display screen. The projection angle difference between the plurality of projection devices is set so that the dispersion angle of the display screen is smaller than the projection angle difference between the projection devices, and projection display is performed on the display screen. Characteristic display device. 2. A display screen is composed of one or a plurality of convex lenses and a diffusing sheet formed by arranging minute convex lenses on one surface, and at least one image light for projection display is provided. The display device according to claim 1, wherein the light is input to the diffusion sheet after passing through the convex lens. 3. The display screen comprises one to a plurality of convex lenses and one to a plurality of wrench killer lenses, and the wrench is provided after the image light projected and displayed passes through at least one of the convex lenses. A display device characterized by inputting to a killer lens. 4. The display device according to claim 3, wherein the lenticular lenses are combined in a plurality of directions so that incident light is dispersed in two or more directions among a horizontal direction, a vertical direction, and an oblique direction. 5. An image of an object photographed by a plurality of photographing devices having different photographing directions is used in a plurality of projection devices in the display device, using the display device according to any one of claims 1 to 4. An image display system, which transmits and displays the plurality of images on a display screen while changing the projection angle. 6. When observing the same display screen from different angles using the display device according to any one of claims 1 to 4, an independent sound field is provided for each observation region, An image display system characterized in that it provides separate sounds that match the images viewed in the observation area. 7. When observing the same display screen from different angles using the display device according to any one of claims 1 to 4, the same common image as that of the other observation region is obtained in one observation region. A projection device in which a common image is input to the one projection device and projected so that an individual video image that is visible and that is not visible in the other observation region is also visible, and the other projection angle is different. , The image signals of the common image and the individual image are superimposed and then input to the other projection device for projection display, or the common image and the individual image are made the same by a plurality of projection devices from substantially the same projection angle. A video display system characterized by being displayed on the display screen of. 8. When observing a display image on the same display screen using the display device according to any one of claims 1 to 4, it is visible to a person in one observation area and the other A video display system, characterized in that the viewing angle between the viewing areas with respect to the display screen is set to be larger than the dispersion angle of the display screen so that it cannot be seen by a person in the viewing area.