JP2002165231A - Specific and multiple eye-point image display devices - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved stereoscopic vision device, in which there is no loss of light beam and in which a brighter image can be displayed, because the beam of light is scanned by a scanning image display device. SOLUTION: In the specific eye-point image display device or the multiple eye-point image display device, when a hologram plate is irradiated with a directive bundle of rays for illumination, the focus of the hologram plate is formed in a surface shape in a position separated from the hologram plate. The scanning image display device is an image display device which displays an image, while the beam of light is being scanned backward and forward as well as to the right and left, and the hologram plate is irradiated with the beam of scanned light as a bundle of rays for illumination. When the hologram plate is observed, by placing the eyes within the range of a face-like focus, the image obtained by the scanning of the beam of light can be observed at the position of the hologram plate.

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 which enables stereoscopic viewing.

[0002]

2. Description of the Related Art The inventors of the present invention have proposed a novel stereoscopic viewing apparatus using a hologram, a specific viewpoint image display apparatus capable of displaying an image of a specific viewpoint only, and a multi-viewpoint image display apparatus having many viewpoints. JP-A-11-190969
No. in the official gazette. The hologram plate used in these apparatuses is formed by a two-stage photographing method, and forms a focal point of the hologram plate in a plane at a position away from the hologram plate. When the hologram plate thus created is irradiated with the light beam for illumination with the above-described specific viewpoint image display device or multi-viewpoint image display device, a screen is reproduced as a hologram image on or near the surface of the hologram plate, and the hologram plate is reconstructed. The emitted diffracted light beam forms a planar focus on the hologram plate at the position of the image of the master hologram plate used when the hologram plate is created by the two-step photographing method. The hologram image on the screen can be observed by looking at the hologram plate only when the eyes are placed within the range of the planar focus. Further, a hologram image of the screen reproduced on or near the surface of the hologram plate is masked with a mask image. As a result, the mask image appears on the hologram image on the screen only from the eye placed at the position of the master hologram plate image.

[0003]

The above-mentioned JP-A-11-1
The stereoscopic device described in Japanese Patent No. 90969 is to provide a novel stereoscopic device. However, it is considered that various improvements and modifications are possible in this novel stereoscopic device. For example, a mask image display device is used as an image display device constituting the device. In order to display a moving image, a mask image display device is placed at a position crossing the optical path of the light beam for illumination. The mask image display device is, for example, a liquid crystal shutter. With the mask image information generator,
When an image signal for driving the liquid crystal shutter is generated based on a video signal based on the mask video information, the mask video display device masks the light beam for illumination with the mask video pattern, thereby forming an image on which the mask video pattern is reflected. Is observed. The liquid crystal shutter displays an image by blocking illumination light. However, light loss is large, and a brighter light source is required to display a bright image. Further, since it is difficult to completely transmit and block light, there is a disadvantage that contrast is deteriorated. Therefore, it is considered that this can be improved or modified.

It is an object of the present invention to provide an improved stereoscopic device.

[0005]

According to the present invention, there is provided a specific-viewpoint image display device, comprising: an illumination light beam generator for generating an illumination light beam having directivity; A transmission-type or reflection-type hologram plate that diffracts the illumination light beam to generate a diffracted light beam having directivity,
A scanning image display device for displaying an image by scanning the light beam for illumination generated from the light beam generator for illumination; and a scanning image display device for transmitting the scanning image information to the scanning image display device and performing the scanning on the scanning image display device. And an optical scanning image controller for scanning the video pattern. The hologram plate forms the focal point of the hologram plate in a plane at a position away from the hologram plate by the irradiation of the illumination light beam. The scanning image display device scans the illumination light beam for displaying an image and reflects the scanned image pattern on the light beam. The image can be observed by looking at the hologram plate with the eyes within the range of the planar focus. The scanning image display device can display a brighter image without light loss because it scans light beams. When the hologram plate is viewed from an eye within the range of the planar focus, an image can be observed.

The hologram plate is, for example,
It is a hologram plate created by a one-step photographing method. In this case, the irradiation of the scanning light beam causes the diffracted light beam generated from the hologram plate to shift the focal point of the hologram plate into a plane at the position of the image of the diffusion plate used when the hologram plate is created by the one-step imaging method. Form. By irradiating the hologram plate with the scanning light beam scanned by the scanning image display device,
The scanned image pattern can be observed from an eye within the range of the planar focus by reflecting the scanned image pattern on the hologram image of the diffuser reproduced.

The hologram plate is, for example, a hologram plate prepared by a two-stage photographing method. In this case, the illumination light beam (scanning light beam) scanned by the scanning image display device.
Irradiates the screen as a scanned video pattern or a hologram image on or near the surface of the hologram plate, and the diffracted light beam generated from the hologram plate is used when the hologram plate is created by a two-step photographing method. The focal point of the hologram plate is formed in a plane at the position of the image of the used master hologram plate. The hologram plate is irradiated with the scanning light beam scanned by the scanning image display device, and the hologram image of the screen to be reproduced reflects the scanning image pattern, and is scanned from an eye within the range of the planar focus. A hologram image reflecting the image pattern can be observed.

Preferably, in the specific viewpoint image display device, the optical scanning image controller determines the length of at least one side of the scanning video pattern displayed by the optical scanning device as the length of the corresponding side of the hologram plate. And the length of the other side is enlarged or reduced by the ratio of the length of the corresponding side of the optical scanning device and the hologram plate to correct the image distortion.

Preferably, in the above-described specific viewpoint image display device, the illumination light beam generated by the illumination light beam generator is a parallel light beam. By using the parallel light beam, it is easy to associate the mask image pattern displayed on the scanning image display device with the scanning image pattern or hologram image reproduced on the hologram plate.

Preferably, in the specific viewpoint image display device, the illumination light beam generated by the illumination light beam generator is a diffuse light beam. By using the diffused light beam, the mask image pattern displayed on the scanning image display device can be enlarged and displayed as a scanning image pattern or a hologram image reproduced on the hologram plate.

Preferably, in the above-mentioned specific viewpoint image display device, the illumination light beam generated by the illumination light beam generator is a convergent light beam. By using the convergent light beam, the mask image pattern displayed on the scanning image display device can be reduced to a scanning image pattern or a hologram image reproduced on the hologram plate and displayed.

[0012] Preferably, the hologram plate of the specific viewpoint image display device also transmits light of an external visual field in front of the hologram plate. Preferably, the hologram plate of the specific image display device is a reflection hologram plate, and a light shielding plate is provided between the hologram plate and an external visual field in front of the hologram plate. Preferably, in the specific viewpoint image display device, at least one hologram plate in the specific viewpoint image display device is formed so as to generate a plurality of planar focal points at different positions in space. Thus, the same image can be separately observed at different positions.

A multi-viewpoint image display device according to the present invention includes a plurality of the specific viewpoint image display devices. The plurality of specific viewpoint image display devices arrange the planar focuses at different positions in at least two or more spaces, and simultaneously place the left and right eyes of the observer within the range of the planar focuses at different positions. The images corresponding to the planar focuses on which the eyes are placed can be observed independently of each other. In this manner, images can be observed independently of each other from the planar focus where each eye is placed.

Since the planar focal points of each specific viewpoint image display device are arranged at different positions in the space, the observer selects one eye for at least one planar focal point selected at the same time and the rest of the selected focal points. When the other eye is placed on at least one planar focal point, different images reflecting different patterns on the left and right eyes can be seen. Of the respective moving images appearing on each specific viewpoint image display device reflecting the scanning video patterns corresponding to different viewpoints that change from moment to moment, moving images with different parallax at the same time corresponding to the positions of the left and right eyes are displayed on the left and right eyes. Can be provided separately. Since the scanned image pattern or hologram image is planar, even if the observer is different and the distance between the left and right eyes changes, the difference in the distance between the left and right eyes is absorbed, and the different planar focal points corresponding to the left and right eyes are different. By placing the left and right eyes separately on the top, the parallax image can be viewed in an easy posture.

Also, since the observer sees the scanned image pattern or the hologram image on which the scanned image pattern is reflected on or near the surface of the hologram plate, the position of the observer's both eyes is changed to the scanned image pattern or the hologram image plate. The entire image can be seen from both the right and left eyes, whether it is away from or close to the camera. In this way, a large-sized image display device or a small-sized image display device can display a parallax image close to natural stereoscopic view with a wide visual field. The hologram plate is, for example,
It is a hologram plate photographed by a one-step photographing method. Also,
The hologram plate is, for example, a hologram plate photographed by a two-stage photographing method.

Preferably, in the multi-viewpoint image display device, at least two planar focuses among the planar focuses of the plurality of specific viewpoint image display devices are overlapped at the same position in space and are superimposed. When all the images corresponding to the respective planar focal points are placed within the range of the superimposed planar focal points (hereinafter referred to as planar focal group),
A plurality of specific viewpoint image display devices are combined so as to allow continuous observation in space, and at least two or more combinations of the plurality of specific viewpoint image display devices are provided. Then, the planar focus groups of each set are arranged at different positions in at least two or more spaces, and the left and right eyes of the observer are simultaneously placed within the range of the planar focus groups at different positions. Of a plurality of sets of specific viewpoint image display devices so that a group of continuous images can be observed independently of each other in the space of each set corresponding to the planar focus group where each eye is placed. Construct a group of combinations. Thereby, the observer can view stereoscopically with a wide field of view.

Preferably, in the above-mentioned multi-viewpoint image display apparatus, all or a part of the images displayed by each of the plurality of specific-viewpoint image display apparatuses overlap each other at the same position in space and are superimposed on each scan. The plurality of specific viewpoint image display devices are arranged such that all planar focal points corresponding to a video pattern or a hologram image are arranged at different positions in space. In this way, the left and right eyes of the observer can be simultaneously placed within the range of the planar focal points at different positions, and the images corresponding to the planar focal points with each eye can be left and right independent without affecting each other. Can be observed. Accordingly, moving images having different parallaxes can be separately provided to the left and right eyes at the same time, and the observer can stereoscopically view the distance with high accuracy.

Preferably, all or a part of at least one image of each of a group of combinations of a plurality of sets of specific viewpoint image display devices overlaps at the same position in space and all correspond to the superimposed images. Sets of planar focus groups are arranged at different positions in the space, and the left and right eyes of the observer can be simultaneously placed within the planar focal group at different positions respectively, and the surface on which each eye is placed A group of a combination of a plurality of sets of specific viewpoint image display devices is configured so that the group of images corresponding to the shape focus group can be observed independently of each other. Thereby, the observer can perform stereoscopic viewing in a wide field of view with an accurate sense of distance.

Preferably, in the above-mentioned multi-viewpoint image display device, at least two or more of the plurality of specific-viewpoint image display devices have their images and planar focuses overlap at the same position in space, respectively, The color of the light beam for illumination generated from the light beam generator is different, each hologram plate is created by shooting using the corresponding different color, and each light scanning image controller is from the same direction at the same time. The information of the scanned image pattern obtained by extracting only the corresponding color components from the viewed scanned image information is transmitted to each optical scanning device, and the superimposed planar focus (hereinafter, referred to as planar focus group) is obtained. Display multiple specific viewpoint images so that when you place your eyes within the range, each color can be mixed and observed as a single-color image Location are combined. The combination of the plurality of specific viewpoint image display devices is
Have more than one set. The superimposed planar focus groups of each set are arranged at different positions in at least two or more spaces, and the left and right eyes of the observer are simultaneously superimposed on each set of superimposed planar focus groups. , A group of a combination of a plurality of sets of specific viewpoint image display devices is arranged. In this manner, color images that appear in one of the above-described sets corresponding to the planar focus groups where the eyes are placed can be observed independently of each other. This allows the observer to view the color image in a stereoscopic manner.

Preferably, in the above-mentioned multi-viewpoint image display device, all or a part of a color image seen as one of a combination group of a plurality of specific viewpoint image display devices overlaps at the same position in space, and , So that all sets of planar focus groups corresponding to the superimposed image are arranged at different positions in the space, so that the left and right eyes of the observer are simultaneously within the range of the planar focus groups at different positions. A combination group of a plurality of sets of specific viewpoint image display devices is configured so as to be placed. In this manner, the color image that looks like the one corresponding to the planar focus group where each eye is placed can be observed independently of the left and right without affecting each other. Thus, the observer can view the color image in a stereoscopic view with a high sense of distance.

Preferably, in the multi-viewpoint image display device, the different colors are red, green, and blue. Thereby, stereoscopic viewing of a color image can be easily performed.

Preferably, in the above-mentioned multi-viewpoint image display device, the illuminating light beam generator of the specific viewpoint image display device generates an illuminating light beam of polychromatic light or white light, and each hologram plate has a different color. Each hologram plate generates a diffracted light beam of a corresponding color. Thereby, a color image can be observed due to the superimposition effect.

Preferably, in the above-mentioned multi-viewpoint image display device, the illumination light beam generator of the specific viewpoint image display device generates an illumination light beam of polychromatic light or white light, and each hologram plate is a rainbow hologram. It is created as a plate, and the rainbow-colored planar focal points formed by the diffracted light beams that are reconstructed by the respective hologram plates and dispersed in the rainbow color are spatially shifted so that different color portions overlap at the same position in the space. And displace them in parallel. When the eyes are placed on the overlapping planar focal points, all the image turns corresponding to the overlapping planar focal points are visible at the same time. By superimposing moving images of images of different colors, color images can be observed at the same time to the left and right eyes.

Preferably, in the multi-viewpoint image display device, at least two or more sets are provided as one set of the multi-viewpoint image display device having two or more viewpoints. Are arranged at positions adjacent to each other. The optical scanning image controller displays a scan image pattern of the same shape on each optical scanning device of each set corresponding to the same order of planar focuses according to the order of planar focuses from the right end to the left end of each set. Let it. This allows a plurality of observers to simultaneously observe the same multi-viewpoint image.

Preferably, in the multi-viewpoint image display device, the next set of the specific viewpoint image displays next to the planar focus arranged at the left end in one set of the specific viewpoint image display devices. The device is configured such that the planar focal point located at the right end of the device comes. Thereby, a plurality of observers arranged side by side can simultaneously observe the same multi-viewpoint image.

Preferably, the multi-viewpoint image display device includes at least two or more sets of the multi-viewpoint image display device having two or more viewpoints, each set including a plurality of specific viewpoint image display devices. Are arranged at positions adjacent to each other, and the rows of the planar focuses of each set are arranged at different positions before and after in the depth direction with respect to the observer. The optical scanning image controller changes the viewing angle and the enlargement / reduction ratio in accordance with the distance in the depth direction with respect to the scanning image pattern of the generated scanning image information. The optical scanning image controller changes the viewing angle and the enlargement / reduction ratio in accordance with the distance in the depth direction with respect to the scanning image pattern of the generated scanning image information. Since the left and right planar focal points of each set are arranged at different distances from the hologram plate in the depth direction in each set unit, it is possible to provide moving images with different left and right viewpoints in accordance with the depth distance to the observer, Even if the position of the user's eyes moves back and forth, stereoscopic vision without contradiction can be obtained.

Preferably, in the multi-viewpoint image display device, at least two or more sets are provided as one set of the multi-viewpoint image display device having two or more viewpoints. Are arranged at positions adjacent to each other, and rows of the planar focuses of each set are arranged at positions adjacent to each other in the vertical direction with respect to the observer. The optical scanning image controller changes the scanning image pattern of the generated scanning image information in the vertical direction according to the difference in the viewing angle.
Thereby, even if the position of the observer's eye moves up and down, the position of the observer's eye coincides with the move up and down, and a moving image having a different viewpoint from top to bottom and left and right can be stereoscopically viewed.

Preferably, in the specific viewpoint image display device or the multi viewpoint image display device, the scanning image information transmitted from the optical scanning image controller of the specific viewpoint image display device is a monochrome grayscale scanning image pattern. Information. An image can be easily observed from a specific direction using the grayscale mask image pattern.

Preferably, the multi-viewpoint image display device further includes a video synchronization device connected to the optical scanning image controller of each specific viewpoint image display device and supplying a synchronization signal for generating a scanning video pattern. With this synchronization signal, the scanning video patterns from different directions at the same time can be automatically displayed at the same timing.

Preferably, in the above multi-viewpoint image display device, the hologram plates of at least two of the specific viewpoint image display devices in the specific viewpoint image display device are one common hologram plate. The scanning image patterns for the at least two specific viewpoint image display devices are displayed in an overlapping manner. Thereby, the thickness of the hologram plate of the entire apparatus is reduced. The hologram plates of at least two specific viewpoint image display devices of the specific viewpoint image display devices are one common hologram plate, and the one hologram plate is the at least two specific viewpoint image display devices. A multi-viewpoint image display device, wherein a planar focus is formed at least at two positions.

Preferably, in the specific viewpoint image display device or the multi viewpoint image display device, at least one hologram plate in the specific viewpoint image display device sets a plurality of planar focal points at different positions in space. Created to occur. This allows the observer to separately observe the same scanned video pattern or hologram image at different positions.

[0032]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference symbols indicate the same or equivalent ones. The specific viewpoint image display device described in Japanese Patent Application Laid-Open No. 11-190969 by the present inventors displays an image on a hologram image of an optically reproduced screen, and a multi-view image display device includes: Multiple screen holograms optically reconstructed using multiple point-of-view image displays
A video is displayed on an image and stereoscopically viewed. The specific viewpoint image display apparatus and the multi-view image display apparatus according to the embodiment of the present invention are described in Japanese Patent Application Laid-Open No. H11-190969.
In common with the publication. However, for image display, an optical scanning device that scans light beams to display an image is used instead of the mask image display device. This will be specifically described below.

The specific viewpoint image display device displays an image from one (specific) viewpoint, scans light with a scanning image, and sets an eye at a planar focus formed by a hologram plate. , The scanned image formed by scanning can be observed. The hologram plate will be described later.

First, a specific viewpoint image display device using a hologram plate created by a two-stage photographing method will be described. FIG. 1 shows a specific viewpoint image display device using a transmission type hologram plate. The optical scanning device 11 is integrated with the illumination light beam generator. The illuminating light beam generator emits an illuminating light beam having directivity and enters the transmission hologram plate 7. The hologram plate 7 reproduces a planar hologram image 8 on or near the surface of the hologram plate 7 by diffracting the illumination light beam onto the transmission hologram plate 7. Further, a diffracted light beam 9 emerging from the hologram plate 7
However, the focus is formed as a plane as the master hologram plate image 10. Since a planar master hologram image 10 is formed,
The reproduced screen hologram image 8 can be clearly seen only from the eye (specific viewpoint) 12 placed on the surface of the image 10.

Further, in order to display a moving image, the optical scanning device 11 is located at a position crossing the optical path of the light beam for illumination. The optical scanning device 11 is connected to the optical scanning image controller 4. The optical scanning device 11 displays an image by scanning the light beam for illumination. The optical scanning image controller 4 is, for example, a scanning signal generating circuit that generates a scanning signal for driving the optical scanning device 11. When receiving a video signal based on scanning video information (for example, monochrome grayscale scanning video moving image information) from the optical scanning image controller 4, the optical scanning device 11 scans a light beam for illumination based on the video signal. The illumination light beam is converted into a post-scan light beam 3, and the hologram plate 7 is irradiated with the post-scan light beam 3 instead of the illumination light beam (in the figure,
The ellipse is used to indicate the spread of the ray bundle).
Thus, the screen hologram plate image on which the scanned image pattern of the light beam 3 after scanning is reflected can be observed from the eyes 12 on the master hologram plate image 10. When the hologram plate 7 is viewed from the eyes 12, the video image is displayed on the screen. It rises on the hologram image. (In the figure, the eye 12 is displayed shifted from the plane of the master hologram plate image 10.)
When the optical scanning device 11 is compared with a liquid crystal shutter, the liquid crystal shutter displays an image by blocking light, so that light loss is large and a brighter light source is required to display a bright image. In addition, it completely transmits light,
There is also a disadvantage that the contrast is deteriorated because it is difficult to block. On the other hand, in the optical scanning device 11, since the light amount is displayed without loss without blocking the light, the light amount of the light source itself only needs to be substantially the same as the brightness seen by the eyes. Can turn off the light, so that an image with good contrast can be displayed.

As described above, the diffracted light beam 9 emitted from the hologram plate 7 forms a focal point as a master hologram plate image 10 in a planar shape. For this reason, the diffracted light does not converge at a specific position, but reaches a plane in the space having a certain tolerance.
Accordingly, the eyes 12 placed on the surface of the master hologram plate image 10 can be shifted on the surface of the master hologram plate image 10. Further, the diffracted light does not converge at a specific position, but spreads and reaches a plane having a certain tolerance in the space. Therefore, the unnecessary virtual image of the master hologram plate image 10 can be weakened and made invisible, and the virtual image does not look bright. In addition, since the hologram image is reproduced on or near the surface of the hologram plate 7 so that the virtual image of the hologram image is superimposed on the real image so that it is difficult to determine the hologram image, a specific viewpoint having a uniform brightness over the entire screen is provided. Images can be displayed.

The optical scanning device 11 is placed at a position obliquely crossing the optical path of the illumination light beam. Here, the light beam for illumination emitted from the light beam generator for illumination in the light scanning device 11 is converted into a parallel light beam, and the light beam for illumination is irradiated in a direction parallel to one side of the hologram plate 7. In this case, the light scanning device 11 is placed orthogonal to the illumination light beam, or the light scanning device 11 is placed parallel to the hologram plate 7, or one side of the light scanning device 11 is irradiated with the illumination light beam in parallel. To be parallel to one side of the hologram plate 7. Then, the length of at least one side of the scanned image created by the optical scanning image controller 4 is matched with the length of the corresponding side of the hologram plate 7, and the length of the other side is adjusted by the optical scanning device 11. And the length of the corresponding side of the hologram plate 7 is enlarged or reduced. This makes it easy to correct distortion in the vertical and horizontal directions of the scanned image created by the optical scanning image controller 4, and projects an accurate and distortion-free image over a wide area including the peripheral portion on the entire surface of the screen hologram image 8. it can. The hologram plate 7 may also transmit light in an external visual field in front of the hologram plate 7. Thereby, a moving image can be displayed in the background of the external visual field. For example, in FIG. 1, a screen hologram image 8 on which a scanning video pattern is reflected can be seen on a background 170.

FIGS. 2 to 4 show an outline of a method of forming the transmission hologram plate 7 used in the apparatus of FIG. 1 by a two-step photographing method. By using such a photographing method, a hologram plate having a planar screen can be formed, the real image and the virtual image do not overlap, and unnecessary glare of the virtual image can be eliminated.

In the two-step photographing method, in the first-step photographing, as shown in FIG.
Is placed a white rectangular screen 8a in front of. Then, a light beam from a light source having coherence (coherence) such as laser light is divided into two by a half mirror or the like, and reflected light from the screen 8a generated by irradiating one light beam to the screen 8a is reflected on an object. The light 9a impinges on the master hologram dry plate 10a. The other light beam is directly applied to the hologram dry plate 10a as the reference light 14a. As a result, interference fringes between the object light 9a and the reference light 14a are recorded on the master hologram dry plate 10a.

Next, in the second stage photographing, as shown in FIG. 3, in the first stage, the master hologram plate 10 on which the interference fringes formed on the master hologram dry plate 10a are fixed.
b with respect to the reference light 14a from the opposite direction to the reference light 14a.
Irradiation light 14b having the same coherency as that of a is irradiated to generate a diffracted light beam 9b to reproduce a screen hologram image 8b which is a real image of the screen 8a. The transmission hologram dry plate 7a is placed at the position of the screen hologram image 8b, and the reference light 2a separated from the same light source as the illumination light 14b is applied to the transmission hologram dry plate 7a from the same side as the diffracted light beam 9b. Thus, the diffracted light beam 9
b and the reference beam 2a are converted to a transmission type hologram dry plate 7
Record in a.

As shown in FIG. 4, a screen hologram image is observed using the transmission hologram plate 7 on which the interference fringes formed on the transmission hologram dry plate 7a are fixed. The transmission hologram plate 7 is irradiated with the illumination light 2 having the same directivity as the reference light 2a from the direction opposite to the reference light 2a to generate a diffracted light beam 9 to generate a real image of the screen hologram image 8b. A screen hologram image 8;
The master hologram plate image 10 which is a real image of the master hologram plate 10b is reproduced. In this case, the screen hologram image 8 can be clearly seen only when the eye 12 is placed at the position of the planar master hologram plate image 10.

FIG. 5 shows a specific viewpoint image display device using a reflection type hologram plate 7 '. The difference from the specific viewpoint image display device shown in FIG. 1 is that a reflection type hologram plate 7 ′ is used instead of the transmission type hologram plate,
The difference lies in the arrangement of the illumination light beam generator 11 and the like. Since the light beam is reflected by the reflection type hologram plate 7 ', the direction of the diffracted light beam 9 comes out of the surface opposite to the incident surface of the light beam 3 after scanning with respect to the hologram plate 7' in FIG. On the other hand, in FIG. 2, the light beam 3 exits from the same surface as the incident surface of the light beam 3 after scanning. The reflection type hologram plate 7 'may further include a light shielding plate 172 provided between the reflection type hologram plate 7' and the background 170 of the external visual field in front. Thereby, the observer can see only the screen hologram image 8 on which the scanning video pattern is reflected.

FIGS. 6 to 8 show an outline of a method of forming the reflection type hologram plate 7 'of FIG. 5 by a two-step photographing method. In the first stage photographing, as shown in FIG. 6, the screen 8a is placed in front of the master hologram dry plate 10a.
A light beam from a light source having coherence such as laser light is divided into two by a half mirror or the like, and reflected light from the screen 8a generated by irradiating one light beam to the screen 8a is used as object light 9a as a master hologram dry plate. 1
0a. The other light beam is directly applied to the hologram dry plate 10a as the reference light 14a. As a result, the object light 9
a and the reference beam 14a are the interference patterns of the master hologram dry plate 1.
0a is recorded.

Next, in the second stage photographing, as shown in FIG. 7, the reference beam 14a is applied to the master hologram plate 10b on which the interference fringes formed on the master hologram dry plate 10a are fixed in the first stage. Irradiation light 14b having the same coherency as the reference light 14a is emitted from the opposite direction to generate a diffracted light beam 9b to reproduce a screen hologram image 8b which is a real image of the screen 8a. The reflection hologram dry plate 7a is placed at the position of the screen hologram image 8b, and the reference light 2a separated from the same light source as the illumination light 14b is applied to the reflection hologram dry plate 7a from the side opposite to the diffracted light beam 9b. Thus, the diffracted light beam 9
b and the reference beam 2a are used to form a reflection hologram dry plate 7
Record in a.

As shown in FIG. 8, when observing a screen hologram image using a reflection hologram plate 7 'in which interference fringes formed on a reflection hologram dry plate 7a are fixed, the reflection hologram plate 7' is The illumination light 2 having the same directivity as the reference light 2a from the direction opposite to the reference light 2a.
To generate a diffracted light beam 9 to produce a screen hologram image 8b which is a real image of the screen hologram image 8b.
Then, the master hologram plate image 10 which is a real image of the master hologram plate 10b is reproduced. In this case, only when the eye 12 is placed at the position of the master hologram plate image 10, the screen hologram image 8 can be clearly seen.

In the above-described specific viewpoint image display apparatus, since the diffracted light beam 9 exiting from the hologram plates 7 and 7 'forms a focal point as a master hologram plate image 10, the master hologram plate image 10 is in space. With a certain area, the diffracted light does not converge to a specific position, and the diffracted light reaches a plane having a certain tolerance in space. For this reason, the observer
The eyes 12 placed on the surface of the master hologram plate image 10 can be freely shifted within the range of the master hologram plate image 10, and a moving image can be viewed in a comfortable posture.

Further, since the diffracted light does not converge on a specific position and reaches a plane having a certain tolerance in the space, an unnecessary virtual image becomes weak and invisible. The virtual image overlaps the real image, making it difficult to determine. Since the hologram image becomes an image with a uniform brightness and the whole screen is gentle and bright, the screen hologram in which the scanning image is reflected on or near the surface of the hologram plate without the observer feeling glare Image 8 can be seen.

Further, since the light scanning device 11 and the light scanning image controller 4 are used, there is no loss of light when scanning the light beam for illumination. Therefore, when the same illumination light beam generator is used, a brighter image can be displayed.

FIGS. 9 to 13 show four structural examples of the illumination light beam generator 11 used in the specific viewpoint image display device shown in FIG. 1 or FIG. FIG. 9 shows a first example of a light beam generator for illumination. A point light source 15 is applied to the center of one surface of the magnifying lens 16 along the central axis. Light exiting from the other surface of the magnifying lens 16 becomes a diffused light beam 17. The scattered light beam 17 is applied to one surface of the convex lens 18. At this time,
When the central axis of the convex lens 18 is aligned with the central axis of the magnifying lens 16 and the center of the magnifying lens 16 is placed at one focal point of the convex lens 18, the convex lens 18 exits from the other surface. The light becomes a parallel light beam and travels as an illumination light beam in parallel to a straight line connecting the central axes of the two lenses.

FIG. 10 shows a second example of the light beam generator for illumination. This example is a point light source 2 used in the generator of FIG.
And a plurality of combinations of the two lenses 16 and 18 are arranged in parallel. This makes it possible to generate a light beam for illumination having a larger cross-sectional area.

FIG. 11 shows a third example of the illumination light beam generator. Instead of the convex lens 18 used in the apparatus of FIG. 9, a curved mirror 19 such as a concave mirror or a parabolic mirror is used, and the magnifying lens 16 is placed at the focal point of the curved mirror. Thus, the light exiting from the curved mirror 19 is converted into a light beam for illumination.

FIGS. 12 and 13 show a fourth example of the light beam generator for illumination. As shown in FIG. 13, a light beam for illumination is generated by using a diffraction grating hologram plate 20 instead of the convex lens of FIG. As shown in FIG.
On one surface of the diffraction grating hologram plate dry plate 20a, an illumination light beam a generated by the method of the above Examples 1 to 3, and the like,
Convergent ray bundle 17 separated from the same light source as illumination ray bundle a
a, and the interference fringes of both light beams are recorded on the diffraction grating hologram plate dry plate 20a.
Create 0. In FIG. 13, for the diffraction grating hologram plate 20 in which the interference fringes formed on the diffraction grating hologram plate dry plate 20a are fixed, the same coherency as the convergent light beam 17a is obtained from the opposite direction to the convergent light beam 17a. Irradiated with the diffused light beam 17 to generate a diffracted light beam to be used as an illumination light beam.

Although the specific viewpoint image display apparatus of this embodiment uses a parallel light beam, the illumination light beam generated by the illumination light beam generator 11 may be a directional light beam. Can be used, and is not limited to a parallel light beam. A diffused light beam or a convergent light beam converging at one point can also be used. The diffused light beam and the convergent light beam can also be generated by changing the position of the light source or the like in the above-described illumination light beam generator.

Next, a specific viewpoint image display apparatus using a hologram plate created by the one-step photographing method will be described. FIG. 14 shows a specific viewpoint image display device using a transmission type hologram plate created by the one-step photographing method. The difference from the specific viewpoint image display device shown in FIG. 1 is that the hologram plate 7 is a hologram plate created by a one-step photographing method. The illumination light beam impinges on the transmission type hologram plate 7 and diffracts, so that the diffracted light beam 9 emerging from the hologram plate 7 is located at the position of the image 10 of the diffusion plate used when the hologram plate 7 is formed by the one-step photographing method. Then, the focal point of the hologram plate 7 is formed in a plane. As in the apparatus shown in FIG. 1, in order to display a moving image, the optical scanning device 11
Is connected, the optical scanning device 11 scans the illumination light beam with a scanning image (scanning image pattern) based on the scanning image information from the optical scanning image controller 4, thereby scanning the position of the hologram plate 7. An image on which the image pattern is reflected can be observed from an eye (specific viewpoint) 12 on the planar diffusion plate image 10.

FIG. 15 and FIG. 16 respectively show the outline of the one-step photographing method of the transmission hologram plate 7 used in the apparatus of FIG. By using such an imaging method, the hologram plate 7 of a planar transmission type diffusion plate 8a or a reflection type diffusion plate 8b can be formed.

In the preparation of the hologram plate by the one-step photographing method, as shown in FIGS. 15 and 16, for example, a milky white transmission type diffusion plate 8a or a reflection type diffusion plate 8b is placed in front of the hologram plate dry plate 7a. . A light beam from a light source having coherence (coherence) such as laser light is divided into two by a half mirror or the like, and one light beam 14
a to the diffusion plates 8a and 8b.
The transmitted light or reflected light from b is applied to the hologram dry plate 7a as object lights 9a and 9b. The other light beam is directly applied to the hologram dry plate 7a as the reference light 14b. As a result, the interference light between the object lights 9a and 9b and the reference light 14b is stored in the hologram dry plate 7a. Thereby, a transmission type hologram plate 7 is created.

As shown in FIG. 17, the hologram dry plate 7
A hologram image is observed using the transmission type hologram plate 7 on which the interference fringes formed on a are fixed. The hologram plate 7 is irradiated with illumination light 2 having the same directivity as the reference light from the direction opposite to the reference light 14b to generate a diffracted light beam 9 to generate a diffusive light beam 9 of the transmission type or the reflection type. The hologram images 10a and 10b are reproduced as planar focuses. In this case, the image can be clearly seen at the position of the hologram dry plate 7a only when the eye 12 is placed within the range of the planar diffuser plate images 10a and 10b.

FIG. 18 shows a specific viewpoint image display device using the reflection type hologram plate 7 '. The difference from the specific viewpoint image display device shown in FIG. 14 is that a reflection type hologram plate 7 ′ created by a one-stage photographing method is used instead of a transmission type hologram plate.
And the arrangement of the illumination light beam generator 11 and the like is correspondingly different.

FIGS. 19 and 20 each show an outline of a method of forming the reflection type hologram plate 7 'used in the apparatus of FIG. 18 by the one-step photographing method. By using such an imaging method, a hologram plate 7 ′ of a planar transmission type diffusion plate 8 a and a reflection type diffusion plate 8 b can be formed. In the preparation of the hologram plate by the one-step photographing method, as shown in FIGS. 19 and 20, a transmission type diffusion plate 8a or a reflection type diffusion plate 8b is placed in front of a hologram plate dry plate 7b. A light beam from a light source having coherence (coherence) such as laser light is divided into two by a half mirror or the like, and one of the light beams 14a is transmitted to the diffusion plates 8a and 8b and transmitted from the diffusion plate. Light or reflected light is applied to the hologram dry plate 7b as object lights 9a and 9b. The other light beam is directly applied to the hologram dry plate 7b as the reference light 14b from the same direction as the object lights 9a and 9b. As a result, the object lights 9a, 9
The interference light between b and the reference light 14b is stored in the hologram dry plate 7b. Thus, the reflection type hologram plate 7 'is formed.

Further, as shown in FIG. 21, a hologram image is observed by using a reflection type hologram plate 7 'having fixed interference fringes formed on a hologram dry plate 7b. The hologram plate 7 ′ is irradiated with illumination light 2 having the same directivity as the reference light from the opposite direction to the reference light 14 b to generate a diffracted light beam 9 to generate a hologram image of a transmission-type diffuser plate image. 10a or the reflection type diffuser plate image 10b is reproduced. In this case, the image can be clearly seen at the position of the hologram dry plate 7b only when the eye 12 is placed within the range of the planar diffusion plate images 10a and 10b.

The specific viewpoint image display device described above
It has the same effect as the case of using the hologram plate by the two-step photographing method, but since the hologram plate prepared by the one-step photographing method is used, the hologram preparation procedure is halved, and the productivity of the hologram plate production is improved. . The light source shown in FIGS. 9 to 13 may be used.

Hereinafter, various embodiments of a multi-viewpoint image display device using a plurality of the above-described specific viewpoint image display devices will be described. FIG. 22 shows a first embodiment of the multi-viewpoint image display device of the present invention. This multi-viewpoint image display device uses four specific-viewpoint image display devices using transmission holograms based on the two-step photographing method shown in FIG. FIG.
Shows another example of the first embodiment of the multi-view image display device of the present invention. This multi-viewpoint image display apparatus uses four specific-viewpoint image display apparatuses using transmission holograms based on the one-step photographing method shown in FIG. Here, the surfaces of the transmission type hologram plates 71 to 74 of the four specific viewpoint image display devices are placed so as to be entirely or partially overlapped, and the surfaces of the diffusion plate images 101 to 104 of the specific viewpoint image display device are placed in space. Placed in different locations. As shown in FIGS. 22 and 23, four screen images or diffuser images 101 to 10
4 are arranged in a line on the left and right. Then, the optical scanning image controllers 41 to 44 of the specific viewpoint image display device are connected to the video synchronizing device 13, and are connected to the optical scanning image controllers 41 to 44 of the specific viewpoint image display device based on the synchronization signal of the video synchronizing device 13. Scanned video information having different time points is continuously generated. In this manner, the planes of at least two images 102 and 103 of the screen image or the diffuser image can be simultaneously selected, and at least one of the selected images 1 and 2 can be selected.
02 with one eye 122 on the side of the selected at least one remaining image 103 with the other eye 123 on
So that different images can be seen in the left and right eyes 122 and 123,
A plurality of specific viewpoint image display devices are arranged. When the optical scanning image controllers 41 to 44 work together to continuously generate scanning image information, when using a hologram plate photographed by the one-step photographing method, a scanning image pattern corresponding to a different viewpoint that changes every moment is used. The reflected moving image is diffracted by the hologram plate into diffusion plate images 101 to 104. Also,
When a hologram plate photographed by the two-stage photographing method is used, the screen hologram image 8 of the specific viewpoint image display device is used.
At 1 to 84, moving images reflecting scanning video patterns corresponding to different viewpoints that change from moment to moment appear. Of the respective image images, the moving images with different parallax at the same time corresponding to the positions of the left and right eyes 122 and 123 are combined with the left and right eyes 122 and
23 can be provided separately. Further, as a combination of the left and right eyes, the right eye 121 and the left eye 122, and the right eye 122 and the left eye 1
23, three combinations of right eye 123 and left eye 124 are possible.

FIG. 24 shows a second embodiment of the multi-viewpoint image display device according to the present invention. This multi-view image display device,
Four specific viewpoint image display devices using the reflection type hologram plate by the two-stage photographing method shown in FIG. 5 are used. FIG. 25 shows another example of the second embodiment of the multi-viewpoint image display device of the present invention. This multi-viewpoint image display apparatus has the configuration shown in FIG.
The four specific viewpoint image display devices using the reflection type hologram plate based on the one-step photographing method shown in FIG. The operation of the multi-viewpoint image display device according to the second embodiment is similar to that of the hologram plate 7.
This is the same as the first embodiment except that 1 ′ to 74 ′ are reflection type hologram plates.

In the multi-viewpoint image display device, the surfaces of the hologram plates 71 'to 74' of the plurality of specific-viewpoint image display devices are entirely or partially overlapped, and the screen image or the diffusion of the specific-viewpoint image display device is displayed. Plate images 101 to 104
Are arranged at different positions in the space. At least two screen images or diffuser plate images 101 to 104 can be simultaneously selected, and at least one of the selected screen images or diffuser plate images 101 to 104 has one eye 1
The left and right eyes 121 to 124 are placed by placing the other eyes 121 to 124 on the surface of the remaining at least one selected screen image or diffuser plate image 101 to 104.
A plurality of specific viewpoint image display devices are arranged so that different images can be viewed at different times. The optical scanning image controllers 41 to 44 of the specific viewpoint image display device are connected to the video synchronizer 13, and the optical scanning image controllers 41 to 44 of the specific viewpoint image display device are synchronized with each other based on the synchronization signal of the video synchronizer 13. Monochrome gray-scale scanning video information with different parallax is continuously generated and linked. Screen hologram images 81 to 84 or a diffuser hologram image of the specific viewpoint image display device,
Moving images corresponding to different viewpoints that change from moment to moment appear,
Of the respective moving images, moving images with different parallax at the same time corresponding to the positions of the left and right eyes 121 to 124 are separately provided to the left and right eyes 121 to 124.

In the multi-viewpoint image display devices of the first and second embodiments, in a plurality of specific-viewpoint image display devices, diffracted light beams 91-94 emitted from the hologram plates 71-74, 71'-74 'are screen images. Or diffuser plate images 101 to 1
Since the focal point is formed as a plane as 04, the eye 12 placed on the surface of the screen image or the diffuser images 101 to 104
Screen images or diffusion plate images 101 to
4 can be freely shifted. Therefore, even if the observer is different and the distance between the left and right eyes is changed, the difference between the distances between the left and right eyes is absorbed, and the left and right separate eyes are placed on the surfaces of the different diffusion plate images 101 to 104 corresponding to the left and right eyes. 1
By placing 21 to 124, a multi-viewpoint image can be viewed in a comfortable posture.

The observer sees the screen hologram images 81 to 84 or the scanned image patterns on which the scanned image patterns are reflected on or near the surfaces of the hologram plates 71 to 74. Of the right eye 12 is apart from or close to the hologram plates 71 to 74.
The entire scanning video pattern reflected on the screen hologram images 81 to 84 or the diffuser plate image can be seen from the left eye 122 to 124 and the left eye 122 to 124. A large-sized image display device or a small-sized image display device can display a multi-viewpoint image close to natural stereoscopic view with a wide visual field.

In a modified embodiment, the light-scanning image controllers 41 and 43 provide the right-eye screen hologram images 81 and 83 or the scanning image pattern of the same parallax to the eyes 121 and 123, respectively. 42 and 44 provide eyes 122 and 124 with the same parallax left eye screen hologram images 82 and 84 or a scanned video pattern. As a result, each left eye,
Provide the same image of the same parallax at the same time corresponding to the position of the left and right eyes to the right eye, and at the same time, view two or more people in the same way with different parallax of the left and right eyes Can be. For example, the first person has eyes 121 and 12
At 2, the second person can view the video with eyes 123 and 124.

FIG. 26 shows a third embodiment of the multi-viewpoint image display apparatus according to the present invention. This multi-view image display device,
This realizes a wide-field multi-viewpoint image display device using four specific-viewpoint image display devices using transmission holograms based on the two-step photographing method shown in FIG. FIG.
Shows another example of the third embodiment of the multi-view image display device of the present invention. This multi-viewpoint image display device realizes a wide-viewpoint multi-viewpoint image display device using four specific viewpoint image display devices using transmission holograms by the one-step photographing method shown in FIG. Here, only different portions of the present embodiment from the first embodiment will be described. In the present embodiment, hologram plates 71 and 74 are placed so as to overlap, and hologram plates 72 and 73 are placed on both sides thereof.
The four specific viewpoint image display devices include two hologram plates 7
Screen images or diffuser images 101 and 1 by 1 and 73
Hologram plates 72 and 7 so that
The screen images or diffuser images 102 and 104 of FIG. 4 are also arranged to overlap. With this arrangement, eye 1
The eye 21 and the eye 123 overlap the right eye, and the eye 122 and the eye 124 overlap the left eye. Therefore, the right eye can see the scanning video pattern reflected on the screen hologram images 81 and 83 or the diffusion plate image continuous to the right side, and the left eye can see the screen hologram images 82 and 84 or the diffusion plate image continuous on the left side. The scanned image pattern can be viewed at the same time. As a result, the diffracted light beams overlap near the center,
The observer can separately observe moving images having different parallaxes in a wide field of view that span a plurality of hologram images respectively on the left and right eyes. Thereby, it is possible to view a three-dimensional image with a wide field of view whose entire viewing angle is close to 180 degrees.

FIG. 28 shows a multi-viewpoint image display apparatus according to a fourth embodiment of the present invention. This multi-view image display device,
A color multi-viewpoint image display device is realized by using six specific viewpoint image display devices using transmission holograms shown in FIG. FIG. 29 shows another example of the fourth embodiment of the multi-view image display device of the present invention. This multi-viewpoint image display device realizes a color multi-viewpoint image display device using six specific viewpoint image display devices using transmission holograms shown in FIG. FIG. 30 is a sectional view showing the arrangement in the vertical direction. This multi-viewpoint image display device differs from the first embodiment of the multi-viewpoint image display device in the following points, in addition to the number of specific viewpoint image display devices. The directions of incidence of the light beams 31 to 36 on the hologram plates 71 to 76 after scanning are distributed from top to bottom in the vertical direction. Diffracted ray bundle 91
-93 are directed to the screen hologram image or the diffuser plate images 101 to 103 overlapping at the same position,
From 3, the screen hologram images 81 to 83 or the scanning video pattern displaying the same parallax video for the right eye can be seen. The colors of the illumination light fluxes 1 to 23 generated by the illumination light flux generators 111 to 113 are red,
The colors are different from green and blue, and from the right eyes 121 to 123, the screen hologram images 81 to 83 or the mixed three colors of red, green and blue of the scanned image pattern can be viewed as one color right eye image. The same goes for the left eye,
Diffracted light beams 94 to 96 are diffused plate images 10 overlapping at the same position.
Screen hologram image 8 displaying the same parallax image for the left eye from left eyes 124 to 126 toward 4 to 106
4 to 86 or a scanned image pattern reflected on the diffuser plate image can be seen. Illumination beam generator 114-1
The colors of the illumination light beams 4 to 26 generated by the light source 16 are different from red, green, and blue, respectively. From the left eyes 124 to 126, the screen hologram images 84 to 86 or the red, green, and blue of the scanned video pattern 3 The colors can be mixed and viewed as a left-eye image of one color. (Because FIG. 15 shows the position in the vertical direction, the diffuser plate images 101 to 106
In FIG. 16, the screen hologram images or the diffuser plate images 101 to 103 and 104 to 1 overlap with each other in the left and right direction, as shown in FIG.
06 is located next to it. As a result, the observer can see a three-dimensional color image with the left and right eyes 121 to 123 and 124 to 126 as a whole.

As described above, the illumination light beam generator 111
At least two screen images or diffusing plate images 101 to 103 for making the colors of the light beams 1 to 26 for illumination emitted from to 116 different colors and superimposing images of different colors;
104 to 106 are superposed at the same position in the space, and the eyes 121 to 1 are placed on the surface of the overlapped screen image or diffuser image.
When 23, 124 to 126 are placed, all the screen hologram images 81 to 83, 84 to 86 corresponding to the overlapped screen image or the diffuser plate image or the scanning image pattern reflected on the diffuser plate image are simultaneously viewed. . Hologram plates 71 to 7 corresponding to overlapping hologram images
3, 74-76 are also arranged to overlap. In this way, color moving images of the same viewpoint are simultaneously displayed. By providing two or more sets of such a configuration, it is possible to separately provide moving images with different parallax of the color to the left and right eyes at the same time, and the observer can observe color moving images with different parallax with the left and right eyes.

Next, a multi-viewpoint image display device according to a fifth embodiment of the present invention will be described. The configuration of this multi-view image display device is the same as that of the multi-view image display device shown in FIGS.
This configuration is different from the multi-viewpoint image display device shown in FIGS. The hologram plates 71 to 76 are rainbow holograms, and the light beam generators 111 to 111 for illumination are used.
The illumination light fluxes 1 to 26 generated from 116 are white light. As in the case of the third embodiment, at least two screen images or diffuser images 10 are superposed and arranged at the same position in space, and an eye is placed on the surface of the overlapped screen image or diffuser image 10. When 12 is placed, all the screen hologram images 8 or the scanning video patterns corresponding to the overlapped screen image or diffuser plate image 10 are made visible at the same time, and the hologram plate 7 corresponding to the overlapped hologram image 10 is also overlapped. A moving image of the same viewpoint is simultaneously displayed on the overlapped screen hologram image 8 or the scanned video pattern.

Here, a rainbow type hologram hologram plate 71 is used to view a color three-dimensional image with both eyes.
The diffracted light beams 91 to 96 emitted from the light beams 76 to 76 are separated into rainbow colors, and the colors of the screen images or the diffuser plate images 101 to 106 in the directions where the left and right eyes 121 to 126 are placed are 101, red, and 102, respectively. Is green, 103 is blue, 104 is blue, 105 is green, and 106 is red. Then, by the optical scanning image controllers 41 to 46, the screen hologram images 81 to 83 and 84 to 86 having different colors or the moving images of the scanning video patterns are overlapped for the right eye and the left eye, respectively.
The entire image is viewed as color left and right parallax images. In this way, moving images with different color parallax can be separately provided to the left and right eyes at the same time.

Next, a description will be given of a sixth embodiment of the modification of the multi-viewpoint image display device. The configuration of this multi-view image display device is the same as that of the multi-view image display device shown in FIGS. This configuration is different from the multi-viewpoint image display device shown in FIGS. The hologram plates 71 to 76 of each specific viewpoint image display device are exposed by separately using screen hologram images 81 to 86 or laser beams of three colors of red, green, and blue corresponding to the colors of the scanned video pattern, respectively. Was created. The illumination light flux emitted from each of the six illumination light flux generators is converted into polychromatic light or white light. Thereby, the hologram plate 71
To 76 are selectively generated, and the screen hologram images 81 to 86 or scan image patterns of different colors are respectively generated differently, so that color vision as a whole is different. Reveal the differential image.

FIG. 31 shows a seventh embodiment of the multi-viewpoint image display apparatus according to the present invention. This multi-view image display device,
A multi-viewpoint image display device capable of moving the viewpoint in the vertical direction is realized by using four specific viewpoint image display devices using transmission holograms based on the two-step photographing method shown in FIG. This multi-viewpoint image display device includes at least two sets of the configuration shown in FIG. FIG. 32 shows another example of the seventh embodiment of the multi-view image display device of the present invention. This multi-viewpoint image display device realizes a multi-viewpoint image display device capable of moving the viewpoint in the vertical direction by using four specific viewpoint image display devices using transmission holograms by the one-step photographing method shown in FIG. This multi-viewpoint image display device includes at least two sets of the configuration shown in FIG. 22 or FIG. Note that FIG.
Reference numeral 3 denotes an arrangement in the vertical direction. Left and right screen images or diffuser plate images 101 to 102, 103 of each set
18 are arranged adjacent to each other in the vertical direction in each set as shown in FIG. 18, and the scanning images created by the optical scanning image controllers 41 to 44 of each specific viewpoint image display device are displayed in the vertical direction. The visual angle is changed and displayed according to the movement.
The observer can select at least two screen images or diffuser plate images 101 to 102 or 103 to 104 at the same time, and select one of the selected screen images or diffuser plate images 101 or 103 with one eye. 12
When the other eyes 122 and 124 are placed on the surface of the selected at least one screen image or diffuser image 102 or 104, the left and right eyes 121 to 12
In FIG. 4, another screen hologram image 81-82, 83-84 on which a different scanning video pattern is reflected or a scanning video pattern reflected on a diffuser plate image can be seen. In accordance with the movement of the left and right eyes in the vertical direction of the observer, moving images with different viewpoints can be provided in the vertical and horizontal directions.

With the right eye 124 and the left eye 123 placed above, and the right eye 122 and the left eye 121 placed below, the optical scanning image controllers 41 to 44 respectively transmit the screen hologram images 81 to 84 or the scanned image pattern to the hologram plate 7.
The display is changed according to the viewing angle for 1 to 74. Accordingly, the moving images having different parallax between the left and right eyes at the upper position are provided to the left and right eyes 124 and 123 in accordance with the viewing angles of the left and right eyes with respect to the hologram plates 71 to 74.
And 121 can be provided with moving images with different parallaxes at the lower position.

FIG. 34 shows an eighth embodiment of the multi-viewpoint image display device according to the present invention. This multi-view image display device,
A multi-viewpoint image display device capable of moving the viewpoint in the depth direction is realized by using four specific viewpoint image display devices using transmission holograms based on the two-stage photographing method shown in FIG. FIG.
5 shows an eighth embodiment of the multi-view image display device of the present invention. This multi-viewpoint image display device has the structure shown in FIG.
A multi-viewpoint image display device capable of moving the viewpoint in the depth direction with respect to a screen hologram image or a diffusion plate hologram image is realized by using four specific viewpoint image display devices using transmission holograms based on the stepwise photographing method. This multi-viewpoint image display device includes at least two sets of the configuration shown in FIG. 22 or FIG. This multi-viewpoint image display device can simultaneously select at least two screen images or surfaces of the diffuser image 10 and select one eye 12 on at least one of the selected screen images or diffuser image 10 surfaces. At least two sets of configurations are provided in which the other eye 12 is placed on the surface of at least one of the remaining screen images or diffuser plate images 10 so that different images can be seen by the left and right eyes 12. The left and right screen images or diffusion plate images 10 of each set are arranged at different distances from the hologram plate 7 in the depth direction in each set unit, and the scanning image created by the optical scanning image controller 4 of each specific viewpoint image display device is formed. In addition, it is possible to provide a moving image with different parallax between the right and left eyes according to the depth distance from the hologram plate 7 of the left and right eyes of the observer, by changing the viewing angle and the enlargement / reduction ratio in accordance with the depth.

In the above-described multi-viewpoint image display apparatus, the right eye 124 and the left eye 123 are placed forward, and the right eye 122 and the left eye
21 is placed at the rear, and the viewing angles and the enlargement / reduction ratios of the screen hologram images 81 to 84 or the scanning video patterns are changed and displayed according to the depth distance from the hologram plates 71 to 74, respectively. In accordance with the depth distance from the hologram plates 71 to 74, the left and right eyes 124 and 123 receive moving images with different left and right parallax at the front position, and the left and right eyes 122 and 121 receive the left and right moving images at the rear position. Moving images with different parallaxes can be provided.

In the above-described multi-viewpoint image display device, the hologram plates of at least two of the specific-viewpoint image display devices may be a common hologram plate. This hologram plate superimposes and displays the scanning video patterns for the at least two specific viewpoint image display devices. Thereby, the thickness of the hologram plate of the entire apparatus is reduced.

In the above-described specific-viewpoint image display device and multi-viewpoint image display device, at least one hologram plate in the specific-viewpoint image display device has a plurality of planar focal points formed at different positions in space. May be created. This allows the observer to separately observe the same video at different positions.

[0080]

As described above, since the scanning type video display device only scans light, there is no light loss, so that the brightness of the image is improved. In addition, when the one-stage photographing method is used, the hologram creation procedure is halved, and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a specific viewpoint image display apparatus using a transmission hologram image.

FIG. 2 is a diagram showing a first-stage photographing of a transmission hologram plate forming method using a two-stage photographing method;

FIG. 3 is a diagram showing a second-stage photographing of a transmission hologram plate forming method using a two-stage photographing method;

FIG. 4 is a diagram schematically showing observation of a screen hologram image by a transmission hologram.

FIG. 5 is a schematic cross-sectional view of a specific viewpoint image display device using a reflection hologram image.

FIG. 6 is a diagram showing the first-stage photographing of a method for producing a reflective hologram plate by a two-stage photographing method;

FIG. 7 is a diagram showing a second-stage photographing of a method for producing a reflection hologram plate by a two-stage photographing method;

FIG. 8 is a diagram schematically showing observation of a screen hologram image by a reflection hologram.

FIG. 9 is a schematic diagram of a first example of an illumination light beam generator.

FIG. 10 is a schematic diagram of a second example of the light beam generator for illumination.

FIG. 11 is a schematic view of a third example of the illumination light beam generator.

FIG. 12 is a diagram showing the creation of a diffraction grating hologram plate of a fourth example of the light beam generator for illumination.

FIG. 13 is a diagram showing the use of the diffraction grating hologram plate of the fourth example of the light beam generator for illumination.

FIG. 14 is a schematic cross-sectional view of a specific viewpoint image display apparatus using a transmission hologram image.

FIG. 15 is a diagram showing a method for producing a transmission hologram plate by a one-step photographing method;

FIG. 16 is a diagram showing another method for producing a transmission type hologram plate by a one-step photographing method;

FIG. 17 is a diagram schematically showing observation of a hologram image by a transmission hologram.

FIG. 18 is a schematic cross-sectional view of a specific viewpoint image display device using a reflection hologram image.

FIG. 19 is a diagram showing a method for producing a reflection type hologram plate by a one-step photographing method;

FIG. 20 is a diagram showing another method for producing a reflection type hologram plate by a one-step photographing method;

FIG. 21 is a diagram schematically showing observation of a hologram image by a reflection hologram.

FIG. 22 is a schematic diagram of a first embodiment of a multi-viewpoint image display apparatus using a transmission hologram image.

FIG. 23 is a schematic diagram of another example of the first embodiment of the multi-viewpoint image display device using a transmission hologram image;

FIG. 24 is a schematic view of a second embodiment of a multi-viewpoint image display device using a reflection hologram image.

FIG. 25 is a schematic view of another example of the second embodiment of the multi-viewpoint image display device using the reflection hologram image.

FIG. 26 is a schematic view of a third embodiment of a multi-viewpoint image display device using a transmission hologram image.

FIG. 27 is a schematic view of another example of the third embodiment of the multi-viewpoint image display device using a transmission hologram image;

FIG. 28 is a schematic diagram of a multi-viewpoint image display device using a transmission hologram image according to a fourth embodiment;

FIG. 29 is a schematic view of another example of the fourth embodiment of the multi-viewpoint image display device using transmission hologram images.

FIG. 30 is a diagram showing the position of the diffuser plate image in the left-right direction.

FIG. 31 is a schematic view of a seventh embodiment of a multi-viewpoint image display apparatus using a transmission hologram image.

FIG. 32 is a schematic view of another example of the seventh embodiment of the multi-viewpoint image display device using transmission hologram images.

FIG. 33 is a diagram showing the position of the diffuser plate image in the front direction.

FIG. 34 is a schematic diagram of an eighth embodiment of a multi-viewpoint image display device using a transmission hologram image.

FIG. 35 is a schematic view of another example of the eighth embodiment of the multi-viewpoint image display device using a transmission hologram image.

[Explanation of symbols]

11, 111-116 Illumination light beam generator, 2, 21-26 Illumination light beam, 2a Reference light or illumination light beam, 3, 31-36 Light beam after scanning, 4, 41-46 Light scanning image controller 7, 71-76 hologram or transmission type (reflection type) hologram plate, 7a dry plate for transmission type (reflection type) hologram, 8 screen hologram image, 9, 91-96 diffracted light beam, 9a object light, 9b diffracted light beam , 10, 101-106 Screen image or diffuser plate image, 11, 111-116 Optical scanning device, 12, 121-126 eyes, 14a Reference light, 14b Illumination light, 170 Background, 172 Light shield plate.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H049 CA01 CA05 CA22 CA28 2K008 AA04 BB04 BB06 CC03 EE01 EE04 FF02 FF07 HH02 HH03 HH06 HH25 5C061 AA29 AB14

Claims (30)

[Claims] An illumination light beam generator for generating an illumination light beam having directivity, and a diffracted light beam having directivity by diffracting the illumination light beam generated from the illumination light beam generator A hologram plate of a transmission type or a reflection type, which forms a focal point of the hologram plate at a position distant from the hologram plate by irradiating the light beam for illumination, and a light beam for illumination. A scanning image display device for displaying an image by scanning the light beam for illumination generated from the light beam generating device, and irradiating a hologram plate with a scanning light beam scanned by the scanning image display device; A scanning image display device that enables the user to observe an image by looking at the hologram plate within the range of the shape focal point, and transmitting the scanning image information to the scanning image display device to the scanning image display device. And a light-scanning image controller for scanning the scanning video pattern. 2. The specific viewpoint image display device according to claim 1, wherein the hologram plate is a hologram plate photographed by a one-step photographing method. 3. The specific viewpoint image display device according to claim 1, wherein the hologram plate is a hologram plate photographed by a two-stage photographing method. 4. The specific-viewpoint image display device according to claim 1, wherein the optical scanning image controller sets a length of at least one side of the scanning video pattern displayed by the optical scanning device to a length of the hologram plate. A specific viewpoint wherein the distortion of the image is corrected by enlarging or reducing the length of the other side according to the length of the corresponding side of the optical scanning device and the hologram plate in accordance with the length of the side. Image display device. 5. The specific viewpoint image display device according to claim 1, wherein the light beam for illumination generated by the light beam generator for illumination is a parallel light beam. Specific viewpoint image display device. 6. The specific viewpoint image display device according to claim 1, wherein the illumination light beam generated by the illumination light beam generator is a diffuse light beam. Specific viewpoint image display device. 7. The specific viewpoint image display device according to claim 1, wherein the illumination light beam generated by the illumination light beam generator is a convergent light beam. Specific viewpoint image display device. 8. The specific viewpoint image display device according to claim 1, wherein the hologram plate also transmits light in an external visual field in front of the hologram plate. 9. The specific viewpoint image display device according to claim 1, wherein the hologram plate is a reflection hologram plate, and a light shielding plate is provided between the hologram plate and an external visual field in front of the hologram plate. A specific viewpoint image display device characterized by the above-mentioned. 10. The specific viewpoint image display device according to claim 1, wherein the scanning image information transmitted from the optical scanning image controller is information of a monochrome gray-scale scanning image pattern. A specific viewpoint image display device which is a feature. 11. The specific viewpoint image display device according to claim 1, wherein the hologram plate is formed so as to generate a plurality of planar focal points at different positions in space. A specific viewpoint image display device which is a feature. 12. A display device comprising a plurality of specific viewpoint image display devices,
Each specific viewpoint image display device has an illuminating light beam generator that generates an illuminating light beam having directivity, and has a directivity by diffracting the illuminating light beam generated from the illuminating light beam generator. A hologram plate of a transmission or reflection type that generates a diffracted light beam, and a hologram plate that forms a focal point of the hologram plate in a plane at a position away from the hologram plate by irradiation of the illumination light beam, A scanning image display device that displays an image by scanning the illumination light beam generator generated from the illumination light beam generator, and irradiates the hologram plate with the scanning light beam scanned by the scanning image display device. A scanning image display device that enables an image to be observed when the user looks at the hologram plate when the user places his / her eyes within the range of the planar focus; and scan image information to the scanning image display device. An optical scanning image controller for transmitting the scanning image pattern to the scanning image display device to transmit the planar focus of each of the plurality of specific viewpoint image display devices to at least two or more different positions in space. So that the left and right eyes of the observer can be placed within the range of the planar focus at different positions at the same time, and the images can be observed independently of the left and right from the planar focus where each eye is placed. And a multi-view image display device in which the plurality of specific-view image display devices are arranged. 13. The multi-viewpoint image display device according to claim 12, wherein the hologram plate is a hologram plate photographed by a one-step photographing method. 14. The multi-viewpoint image display device according to claim 12, wherein the hologram plate is a hologram plate photographed by a two-stage photographing method. 15. The multi-viewpoint image display device according to claim 12, wherein at least two planar focuses among the planar focuses of the plurality of specific viewpoint image display devices are within a space. When all images overlapping the same position and corresponding to each superimposed planar focus are placed within the range of the superimposed planar focus (hereinafter referred to as planar focus group), the space A plurality of specific viewpoint image display devices are combined so that they can be continuously observed within, The combination of the plurality of specific viewpoint image display devices is provided with at least two or more sets, and each planar focus group of each of the sets is provided. , Can be placed at least at two or more different positions in the space, and the left and right eyes of the observer can be simultaneously placed within the range of the planar focus groups at the different positions, respectively. To A multi-viewpoint image display device comprising a group of combinations of a plurality of sets of specific viewpoint image display devices so that a group of continuous images in the corresponding set of spaces can be observed independently of each other. 16. The multi-view image display device according to claim 12, wherein all or a part of the images displayed by each of the plurality of specific viewpoint image display devices is located at the same position in space. A multi-viewpoint image display device, wherein the plurality of specific viewpoint image display devices are arranged such that all planar focal points corresponding to overlapping and superimposed images are arranged at different positions in space. 17. The multi-viewpoint image display device according to claim 15, wherein all or a part of at least one image of each of a group of combinations of a plurality of sets of specific viewpoint image display devices is at the same position in space. All the sets of planar focus groups corresponding to the superimposed images are arranged at different positions in the space, and the left and right eyes of the observer are simultaneously within the range of the planar focus groups at different positions. A group of a combination of a plurality of sets of specific viewpoint image display devices is configured so that the group of images corresponding to the planar focus group where each eye is placed can be observed independently of each other. Multi-view image display device. 18. The multi-viewpoint image display device according to claim 12, wherein at least two or more of the plurality of specific-viewpoint image display devices each have a space between images and a planar focus. And the color of the light beam for illumination generated from the light beam generator for illumination is different, and each hologram plate is created by photographing using the corresponding different color, and each light scan is performed. The image controller transmits, to each optical scanning device, information of a scanning image pattern in which only corresponding color components are extracted from the scanning image information viewed from the same direction at the same time, to the respective optical scanning devices. When you place your eyes within the range (hereinafter referred to as planar focus group), you can observe each color as one color image A plurality of specific viewpoint image display devices are combined, at least two or more combinations of the plurality of specific viewpoint image display devices are provided, and the superimposed planar focus groups of the respective sets are combined into at least two or more spaces. And a plurality of sets of specific viewpoint images so that the left and right eyes of the observer can be simultaneously placed within the range of each set of superimposed planar focus groups at different positions. A multi-view image display device comprising a group of combinations of display devices. 19. The multi-viewpoint image display device according to claim 18, wherein all or a part of the color images seen in each one of the combination groups of the plurality of specific viewpoint image display devices are at the same position in space. In such a manner that all sets of planar focus groups corresponding to the superimposed images are arranged at different positions in the space, the left and right eyes of the observer are simultaneously placed in different positions at different positions. Can be placed within the range of, and a plurality of sets of color images that look like the one corresponding to the planar focus group where each eye is placed can be observed independently of the left and right without affecting each other. A multi-view image display device comprising a combination group of specific-view image display devices. 20. The multi-view image display device according to claim 18, wherein said different colors are red, green and blue. 21. The multi-viewpoint image display device according to claim 18, wherein the illumination light beam generator of the specific viewpoint image display device generates an illumination light beam of polychromatic light or white light. , Each hologram plate is made by shooting in different colors,
A multi-viewpoint image display device, wherein each hologram plate generates a diffracted light beam of a corresponding color. 22. The multi-viewpoint image display device according to claim 18, wherein the illumination light beam generator of the specific viewpoint image display device generates an illumination light beam of polychromatic light or white light. Each hologram plate is formed as a rainbow type hologram plate, and the rainbow-colored planar focus formed by the diffracted light beams that are reproduced by the respective hologram plates and are dispersed into rainbow colors is divided into different color portions. A multi-viewpoint image display device, which is arranged so as to be shifted in parallel in space so as to overlap at the same position in the image. 23. The multi-view image display device according to claim 12, wherein a set of multi-view image display devices having two or more viewpoints is provided.
The optical scanning image controller includes at least two or more sets, and the planar focuses of the plurality of specific viewpoint image display devices of each set are arranged at adjacent positions, and the optical scanning image controller includes a planar focus from a right end to a left end of each set. A multi-viewpoint image display device for causing each set of optical scanning devices corresponding to the same order of planar focuses to display the same shape of a scanned video pattern in accordance with the order of the above. 24. The multi-viewpoint image display device according to claim 23, wherein the next set of said specific viewpoint image display devices is arranged next to a planar focus arranged at the left end. A multi-viewpoint image display device wherein the planar focus located at the right end of the specific viewpoint image display device is configured to come. 25. The multi-view image display device according to claim 12, wherein at least two or more sets are provided as one set of the multi-view image display device having two or more viewpoints. The planar focuses of the plurality of specific viewpoint image display devices of each set are arranged at positions adjacent to each other, and the rows of planar focuses of each set are arranged at different positions before and after in the depth direction with respect to the observer. A multi-viewpoint image display device, wherein the optical scanning image controller changes a viewing angle and an enlargement / reduction ratio of a scanning image pattern of generated scanning image information in accordance with a distance in a depth direction. 26. The multi-view image display device according to claim 12, wherein at least two or more sets are provided as one set of the multi-view image display device having two or more viewpoints. The planar focuses of each set of the plurality of specific viewpoint image display devices are arranged at positions adjacent to each other, and the rows of planar focuses of each set are arranged at positions vertically adjacent to the viewer, Wherein the optical scanning image controller changes the scanning video pattern of the generated scanning video information in the vertical direction in accordance with the difference in viewing angle. 27. The multi-viewpoint image display device according to claim 16, wherein the scanning image information transmitted from the optical scanning image controller of the specific viewpoint image display device is provided. A multi-viewpoint image display device characterized in that the information is information of a monochrome grayscale scanning video pattern. 28. The multi-viewpoint image display device according to claim 12, further comprising a synchronization signal for generating a scanning image pattern, wherein the multi-viewpoint image display device is connected to an optical scanning image controller of each specific viewpoint image display device. A multi-viewpoint image display device, comprising: a video synchronizer capable of automatically scanning and displaying scanned video patterns at the same time from different directions at the same timing. 29. The multi-viewpoint image display device according to claim 12, wherein the hologram plates of at least two of the specific viewpoint image display devices among the specific viewpoint image display devices are common. A multi-viewpoint image display device, comprising one hologram plate, wherein the one hologram plate superimposes and displays the scanning video patterns for the at least two specific viewpoint image display devices. 30. The multi-viewpoint image display device according to claim 12, wherein at least one hologram plate in the specific viewpoint image display device has a plurality of planar focal points in a space. A multi-viewpoint image display device which is created so as to occur at different positions.