JPH10170865A - Element hologram panel, and element hologram recording method used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to three-dimensionally display a large screen and and make a user passable to observe the three-dimensional image from optical direction and position, by arranging plural cells making one unit out of plural element holograms for displaying different point images. SOLUTION: This element hologram panel is constituted so that plural cells 21 of a size equal to the pitch of the point image 22 to be displayed are arranged. That is, the element hologram panel is constituted by arranging in a lattice shape the cells 21 of the size equal to the pitches Sx, Sy in the X direction and Y direction being the uniform interval of the point images 22 on the plane parallel to the element hologram panel. Thus, since the element hologram for displaying one point image 22 is dispersed to plural cells 22, the data amount is reduced, and the three-dimensional image is displayed by the point image 22 with a wide view area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a three-dimensional object display device for displaying a three-dimensional object, and is provided with an element hologram panel comprising a plurality of element holograms for displaying a three-dimensional object and a method for recording an element hologram used therefor. It is about.

[0002]

2. Description of the Related Art Conventionally, a holographic three-dimensional display has been known as a display for reproducing a three-dimensional image in space. Holography is a technique for recording and reproducing both the amplitude and phase of light on a certain plane. According to this technique, even if the viewpoint is moved up, down, left, and right during reproduction, a three-dimensional image is obtained as an image from different angles. Can be seen. In this display method, since all physiological factors, binocular parallax, convergence, and eye adjustment that a human perceives a three-dimensional image are satisfied, a more natural three-dimensional image can be displayed than other methods. The hologram used for this purpose is created by causing a light wave from a subject called object light and a light wave coming from another direction called reference light to interfere with each other, and recording this interference fringe. When the reference light is incident on this hologram, it is diffracted by the interference fringes in the hologram to form the same wavefront as the original object light, and the object image emerges in space.

[0003] Further, a normal holographic display is a still image, and several methods for converting this to a moving image have been proposed. One such method is a real-time holographic display developed by Professor Benton of MIT Media Lab. FIG. 14 is a diagram showing an outline of the configuration of the real-time moving image holographic display. FIG.
In 4, a hologram signal 202 for reproducing a three-dimensional image 208 is calculated by a computer (not shown), and is input by an AOM (Acousto-optic Modulator) 203. Then, the laser beam 204 modulated by the AOM 203 is further supplied to the galvanomirror 2
05 and the polygon mirror 206 perform vertical scanning and horizontal scanning, respectively.

[0004] The AOM 203 cannot display all the holograms necessary for reproducing the three-dimensional image 208 at once, but can display the hologram corresponding to the whole image within a certain time by performing horizontal and vertical scanning. Becomes possible. The horizontal scanning by the polygon mirror 206 is A
It also serves to compensate for the flow of the hologram interference fringes traveling in the OM 203 and to freeze the image. And AOM20
Since the diffraction angle from 3 is about 3 (deg), the hologram can be reduced and image-formed by a reduction optical system such as the output lens 207, and a visual field equivalent to 5 or 6 times the diffraction angle can be obtained.

As described above, a virtual hologram is formed near the output lens 207 by using the scanning / reducing optical system, and the observer 209 can view the three-dimensional image 208 through the output lens and a diffusion plate (not shown). You can see. Here, the diffusion plate performs diffusion in one vertical direction and contributes to expansion of the observation area. The one shown in FIG.
Although the system is a monochrome display system, the color display uses three AOMs, and three color lasers (red: He-Ne).
(632.8 nm), green: Nd: YAG (532.0 n)
m), blue: He-Cd (441.6 nm)).

[0006] Japanese Patent Application Laid-Open No. 6-82612 discloses that
A three-dimensional image display device using a diffraction grating array is disclosed. This is to display a stereoscopic image by dividing the cells in a diffraction grating array in which a plurality of cells composed of diffraction gratings are arranged on a planar substrate and making each of the divided regions correspond to a pixel of each parallax image. ing. This method is characterized in that an image having parallax can be displayed. FIG.
FIG. 1 shows a schematic view of a diffraction grating array used in the three-dimensional image display device. In FIG. 15, a diffraction grating array 211 is one in which a plurality of cells 215 including a plurality of pixels 212, 213, and 214 are arranged on a planar substrate 216. Pixels 212, 213, and 214 are
Are spatially divided in a region where the gradient and the grid interval are close, and these pixels 212, 213, and 214 are a diffraction grating array 211 corresponding to each parallax image.
By using the diffraction grating array 211 as a basic device, it is possible to display a stereoscopic image having parallax.

FIG. 16 is a schematic view of a main part of a three-dimensional image display device using the diffraction grating array 211. FIG.
Is a diffraction grating array 211.
A liquid crystal display element 222 which is a spatial light modulation element provided on the rear surface of the diffraction grating array 211;
2 and a color filter 223 provided on the rear surface. In this stereoscopic display device, considering a minute area, for a white incident light, a certain wavelength is selected from the incident light by the color filter 223, and transmission / blocking of the light is selected by the liquid crystal display element 222. The transmitted light reaches the diffraction grating array 211. here,
The diffraction grating array 211 is formed of a light transmissive resin plate or the like, and the arrived light is diffracted when transmitted. At this time,
Regarding the emission direction of the diffracted light, the diffraction angle is determined by the gradient of the minute region and the grating interval. Then, when observed from the direction of the diffraction angle, the minute region appears to shine at the selected wavelength. In this way, a three-dimensional image is displayed by operating each minute area according to the three-dimensional image to be displayed.

[0008]

However, the above conventional technique has the following problems. For the real-time video holography display shown in FIG.
To calculate the interference fringes of a three-dimensional image by computer,
It takes an enormous amount of time. Further, in order to display a three-dimensional image based on the interference fringe data, the data becomes enormous, and a large-capacity image memory and high-speed data transfer are required. Therefore, it was very difficult to display a large three-dimensional image.

[0009] Further, the display device disclosed in Japanese Patent Application Laid-Open No. 6-82612, that is, a stereoscopic image display device using a diffraction grating array shown in FIG. There is a disadvantage that only a stereoscopic image can be displayed.

As described above, in the conventional three-dimensional image display device, it is difficult to display a large three-dimensional image.
The eyes were easily fatigued because of the stereogram image.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is capable of displaying a large screen three-dimensionally. The observer creates an image and observes it from any direction and position.
An object of the present invention is to provide an element hologram panel which realizes a three-dimensional image display device capable of focusing and observing a three-dimensional image, and a method of recording an element hologram used therein.

[0012]

According to the first aspect of the present invention, there is provided an element hologram panel in which a plurality of element holograms for displaying a plurality of point images constituting a three-dimensional image are arranged. , A plurality of cells forming one unit from a plurality of element holograms for displaying different point images are arranged.

According to the first aspect of the present invention, since the element holograms for displaying one point image are dispersed in a plurality of cells, the data amount is reduced, and the point image having a wide viewing area is obtained. And a three-dimensional image can be displayed.

Further, according to the second aspect of the present invention, in the above element hologram panel, the size of the cell is configured to be the same as the interval between a plurality of point images on a plane parallel to the element hologram panel.

According to the second aspect of the present invention, since the interval between the point images and the cell size are the same, an element hologram panel is constructed by arranging a plurality of cells having the same arrangement of element holograms. Then, when calculating the element hologram by the computer, it is not necessary to calculate in each of a large number of cells, and the amount of calculation at that time can be greatly reduced.

Further, in the invention described in the claims, in the above element hologram panel, a plurality of cells having the same element hologram arrangement are arranged.

According to the third aspect of the present invention, since a plurality of cells having the same array of element holograms are arranged, it is not necessary to calculate each of a large number of cells when calculating the element hologram by a computer. The amount of calculation can be greatly reduced.

Further, in the invention according to the fourth aspect, the interval between a plurality of point images and the cell size in a plane parallel to the element hologram panel are made uniform in the same direction.

According to the fourth aspect of the present invention, since the size of the cells is made uniform in the same direction, the element hologram panel can be constituted by a single cell. At the time of calculation, it is not necessary to calculate for each of a large number of cells, and the amount of calculation at that time can be greatly reduced.

According to a fifth aspect of the present invention, there is provided a method for recording an element hologram used in the element hologram panel, wherein the plurality of point images displayed on the same axis in a direction perpendicular to the element hologram panel. Element holograms to be recorded in different cells are recorded in the same cell.

According to the fifth aspect of the invention, the element hologram to be recorded in another cell is recorded in the same cell. Therefore, when the element hologram is obtained by the computer, the amount of calculation is further reduced. Can be reduced.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG.
It is a schematic diagram of an element hologram panel of the present invention. As shown in FIG. 1, the element hologram panel 11 is configured to display a three-dimensional image 12 composed of a point image so as to float on the element hologram panel 11.

First, the configuration of the element hologram panel 11 will be described in more detail. FIG. 2 shows a part of the element hologram panel 11 according to the present invention as viewed from directly above. Cell 2 having a size equal to the pitch of point image 22 to be displayed
1 is arranged in a plural number. That is, FIG.
As shown in the figure, the X direction (horizontal direction in the drawing), which is the uniform interval between the point images 22 on a plane parallel to the element hologram panel 11
The cells 21 having the same size as the pitches Sx and Sy in the Y direction (vertical direction in the drawing) are arranged in a grid pattern to form an element hologram panel.

Here, the principle of displaying a point image in three dimensions by the element hologram panel 11 will be described. FIG. 3 is a diagram for explaining the display principle of the point image.
(A) shows a case where a single point image 31 is displayed on a hologram 32. In the hologram 32, wavefront data representing the point image is written on the entire surface of the hologram 32. Here, the data is recorded with considerable redundancy, but in order to reduce the amount of data, as shown in FIG.
The point image 33 can be displayed. However, in this case, the range in which the point image can be seen (viewing zone) becomes narrow.

Therefore, as shown in FIG. 3C, if small holograms (element holograms) 36 are dispersed over a wide range, the amount of data can be reduced and a point image 35 having a wide viewing area can be reproduced. Then, in a portion where the data of the point image is not recorded, data of another point image is recorded. In this way, a large number of point images are recorded as elementary holograms on one panel, a necessary elementary hologram is selected, and a laser beam is irradiated to display a three-dimensional image composed of many point images. Becomes possible. Furthermore, if the laser light irradiation is changed over time, a three-dimensional moving image can be displayed.

Next, the cell 21 constituting the element hologram panel 11 will be described. The cell 21 is composed of a group of element holograms in which a single element hologram displays a single point image. FIG. 4 is a conceptual diagram for explaining the point image reproduction of this cell. S1 in FIG. 4 is a range where a hologram is recorded when a point image 41 of height l from the element hologram panel 11 is seen at an angle θ. If small holograms (element holograms) are dispersed in this range S1, the point image 41 can be displayed in the viewing zone θ. Also, as shown in FIG.
When 2 is also displayed, the hologram when the point image 42 of the pitch Sz in the height l + Z direction can be seen at the angle θ may be recorded in the range of S2. Further, the pitch S of the point image in the X direction
When displaying the point image 43 to the right with x, it is sufficient that the hologram when the point image 43 of height l is seen at the angle θ is recorded in the range of S3. As in the case of the point image 41, if the small holograms (element holograms) 36 are dispersed in the ranges S2 and S3, the point images 42 and the point images 43 can be displayed in the viewing zone θ.

In this way, a three-dimensional image can be reproduced by writing element holograms to the element hologram panel 11 for all point images to be displayed. But,
It is difficult to actually write all the point images constituting the three-dimensional image on the element hologram panel 11 by interference with a laser beam or to calculate a hologram pattern. Therefore, in the present invention, writing and calculation of a hologram of the entire panel can be easily performed by creating a cell having a size equal to the pitch of the point image and arranging a plurality of the cells.

Next, a description will be given of the fact that the entire configuration of the panel can be obtained simply by forming cells having a size equal to the pitch of the point images and arranging a plurality of cells. FIG. 5 is a diagram showing the element hologram panel viewed from the side (from the Y direction). Here, the point images are arranged at a pitch Sx in the X direction, a pitch Sz from the height l from the element hologram panel, and a field of view θ. At this time, one cell has a pitch Sx in the X direction of the point image.

Here, the element hologram recorded in Sx will be considered. First, the recording range of the element hologram such that the point image 51 closest to the substrate can be seen in the visual field θ is Sx,
Sx1. At this time, an element hologram for displaying the left half viewing area of the point image 51 is recorded in Sx.
Similarly, an element hologram for displaying the right half viewing area of the point image 51 is recorded in Sx1. Next, when the point images 52 having the same height are considered, the recording range of the element hologram in which the point images 52 can be seen in the visual field θ is the range of Sx and Sx2. At this time, an element hologram for displaying the right half viewing zone of the point image 52 is recorded in Sx.
In 2, an element hologram for displaying the left half viewing area of the point image 52 is recorded.

Here, Sx for displaying the right half of the point image 51
The element hologram of 1 and the element hologram of the element hologram Sx displaying the right half of the point image 52 have the same hologram pattern. Further, the element hologram of Sx displaying the left half of the point image 51 and the element hologram of the element hologram Sx2 displaying the left half of the point image 52 have the same hologram pattern. From this, element holograms to be recorded in Sx are determined as one cell, and by arranging a number of cells corresponding to the number of X-direction point images, those point images can be displayed.

Next, considering a point image on the pitch Sz in the Z direction from the point images 51 and 52, the recording range of the element hologram such that the point image 54 can be seen in the visual field θ is Sx, Sx
1, Sx2 and Sx3. At this time, Sx and Sx
Element holograms for displaying the left half viewing area of the point image 54 are recorded in 2, and similarly, element holograms for displaying the right half viewing area of the point image 54 are recorded in Sx 1 and Sx 3. You. Next, the point image 55 is considered.
The recording range of an element hologram such that
The range is Sx, Sx1, Sx2, Sx4. At this time,
Element holograms for displaying the right half viewing area of the point image 55 are recorded in Sx and Sx1, and similarly, Sx2 and Sx1 are recorded.
At x4, an element hologram for displaying the left half viewing area of the point image 55 is recorded.

Further, among the element hologram recording ranges in which the point image 53 can be seen in the visual field θ, element holograms for displaying the left half viewing area are recorded at Sx and Sx1.
And Next, the element holograms for displaying the right half viewing area of the element hologram recording range in which the point image 56 can be seen in the visual field θ are recorded at Sx and Sx2.

Here, the element hologram of the point image 56 recorded in Sx2, the element hologram of the point image 55 recorded in Sx, and the element hologram of the point image 54 recorded in Sx1 have the same hologram pattern. Become. Also, Sx
The element hologram of the point image 53 recorded in 1, the element hologram of the point image 54 recorded in Sx, and the element hologram of the point image 55 recorded in Sx2 have the same hologram pattern. The element hologram of the point image 56 recorded in Sx, the element hologram of the point image 55 recorded in Sx1, and the element hologram of the point image 54 recorded in Sx3 have the same hologram pattern. Also, S
The element hologram of the point image 53 recorded in x, the element hologram of the point image 54 recorded in Sx2, and the element hologram of the point image 55 recorded in Sx4 have the same hologram pattern.

From the above, Sx is an element hologram displaying the left side of the point image 51, an element hologram displaying the right side of the point image 52, an element hologram displaying the left outer half of the point image 53, and the left side of the point image 54. Since an element hologram displaying the inner half, an element hologram displaying the right inner half of the point image 55, and an element hologram displaying the right outer half of the point image 56 are respectively recorded, the hologram recorded in Sx Sx1 to Sx4 may be the same pattern as long as the pattern is calculated.

Similarly, the same effect can be obtained by setting the pitch of the point image in the Y direction to the size of the cell in the Y direction. Therefore, the configuration of the entire panel can be obtained simply by creating cells having a size equal to the pitch (interval) of the point images and arranging them in accordance with the number of point images. However, since the visual field of each point image at this time is smaller than θ, the number of cells in the X direction in each of the X direction and the Y direction = ｛(the number of point images in the X direction−1) + ( The number of cells in the X direction necessary to display a point image at a high position) × 2｝ (number) The number of cells in the Y direction = ｛(the number of point images in the Y direction−1) + (highest) The viewing area θ is displayed by arranging (the number of cells in the Y direction necessary for displaying a point image at the position) × 2｝ (number) of cells.

Further, since an extra point image (smaller than the visual field θ) is displayed outside the point image to be displayed in the X and Y directions, the element hologram corresponding to the point image is masked or the like. It is necessary to use and not display.
However, since the element holograms on the element hologram panel correspond to the point images, they can be easily erased (not displayed) by using a mask or the like. Thus, a three-dimensional image can be reproduced.

Next, an element hologram in the cell is obtained.
FIG. 2 is a diagram showing a part of the element hologram panel 11 as viewed from above. As shown in FIG. 2, the size of one cell 21 is the pitch Sx of the point images in the X direction and the pitch Sy of the point images in the Y direction. Of the element holograms of all the point images, only the hologram pattern of the element hologram to be recorded in one cell 21 is obtained using a computer or the like. However, in this method, the calculation must be performed for the element holograms of all the point images to be recorded in the cell 21. Therefore, when the number of point images to be displayed increases, the amount of calculation also increases.

In this embodiment, the element holograms may be overlapped by simply superimposing them. However, there is no problem even if the element holograms are slightly displaced. And the element holograms may be arranged so that they do not overlap.

An example of a method for producing a cell and an element hologram panel produced by using the above method will be described with reference to FIG. 6 which is a conceptual diagram thereof. Here, for the sake of simplicity, eight point images (2 × 2
× 2) (Point image group 62) A method of creating a cell for display will be described. However, in this example, it is assumed that one point image in the viewing zone θ can be displayed by eight element holograms (in the element hologram panel 61).

First, of the eight point images, two point images in the Z direction are considered. FIG. 7 shows an example of arrangement of element holograms for displaying two point images. And. FIG. 8 shows the element hologram panel viewed from the point image display side. It is to be noted that a part of the upper part of FIG. 8 (single cell area) is enlarged in the lower part.

The positions of element holograms for displaying two point images A and B as shown in FIG. 7 are denoted by a and b, respectively, as shown in FIG. When this is divided into the size of the pitch of the point image and superimposed one by one (one unit), a cell 101 is obtained. At this time, since there are overlapping element holograms, for example, when the element hologram b of a and b is moved to a vacant position indicated by an arrow in FIG. 9A, the result of the movement is as shown in FIG. 9B. become. At this time, the point images displayed by the element holograms of the cell are 12 point images as shown in FIG. Here, the point images A, B, B ', C, D, D', E,
Element holograms displaying F, F ', G, H, H'
A, b, b ', c, d, d', e, f, f ',
g, h, h '. At this time, the viewing zone of each point image becomes smaller than θ. Although not described in detail, one cell can be obtained by calculation. In the present embodiment, a hologram pattern of an element hologram corresponding to each point image is obtained by calculation using a conventional GGH, and is set as one cell.

Next, in the cell (see FIG. 10) in which the hologram pattern is calculated, the viewing zone is smaller than θ, and this is shown in FIG. 13 which is a view from the point image display side of the element hologram panel. Thus, the number of cells in the X direction = ｛(the number of point images in the X direction−1) + (highest) so that all the point images 131 (here, eight) to be displayed have the viewing zone θ. The number of cells in the X direction necessary to display the point image at the position) × 2｝ (number) = (2-1) + 2 × 2 = 5 The number of cells in the Y direction = ｛(point image in the Y direction) -1) + (the number of cells in the Y direction required to display the point image at the highest position) × 2｝ (number) = (2-1) + 2 × 2 = 5 Arrange 5 × 5 pieces.

However, in this state, an extra point image 132 as shown by a dotted line in FIG. 13 is displayed. Therefore,
By masking all the element holograms corresponding to the extra point image 132 with the mask 133, the outer extra point image 132 is not displayed, and the desired 2 × 2 × 2 point images 1
31 can be displayed. In this example, since the number of point images is small, the portion to be masked occupies most, but as the number of point images increases, the central portion does not need to be masked. Also, since the element holograms for displaying all the point images are known, the element images corresponding to the point images are turned on and off (switching between mask and unmask) by turning the mask on and off. An image can be easily displayed.

It should be noted that in FIGS. 8, 10 and 11,
When viewed from the point image display side of the element hologram panel, points that are actually displayed in an overlapping manner are drawn shifted.

[Second Embodiment] Hereinafter, a second embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. The second embodiment is similar to the first embodiment described with reference to FIGS.
A two-dimensional image can be displayed. The second embodiment is different from the first embodiment in that an element in a cell for displaying a point image in the Z direction, that is, in the direction perpendicular to the surface direction of the element hologram panel. The method for obtaining a hologram will be described below. Here, the hologram pattern of the element hologram in the cell is obtained based on the number of point images only in the Z direction, not all the point images to be displayed.

As an example, a method of obtaining a cell when displaying three point images in the Z direction will be described. FIG. 12 is a diagram showing the panel as viewed from the side (from the Y direction), in which three point images in the viewing zone θ are arranged at a pitch Sz in the Z direction.

Next, description will be made with reference to FIG. 13 which is an explanatory diagram for explaining a method of obtaining cells when three point images are displayed in the Z direction in the present embodiment. FIG. 13 shows a point image A,
FIG. 13 is a diagram showing an element hologram panel displaying a point image B and a point image C viewed from the side (from the Y direction).
, The left-right direction is the X direction.

First, a hologram pattern to be recorded for displaying a point image A, a point image B, and a point image C is directly recorded on the panel Sx (FIG. 13A). Next, S1
A hologram pattern to be recorded for displaying the point images A, B, and C of FIG.
(B)), a hologram pattern indicating a point image C to be recorded in S2 is recorded so as to be superimposed on Sx (FIG. 13).
(C)). Then, a hologram pattern displaying a point image A, a point image B, and a point image C to be recorded in S3 is superimposed and recorded on Sx (FIG. 13D), and the point image A, the point image to be recorded in S4 The hologram pattern for displaying the image B and the point image C is represented by S
x is recorded over (FIG. 13E). Then, S5
A hologram pattern indicating a point image C to be recorded is recorded on Sx (FIG. 13F).

Thus, Sx, S1, S2, S3, S
4. The hologram pattern to be recorded in S5 is calculated, and the hologram pattern of the element hologram in the cell is obtained by overlapping the panel on the point image Sx. According to the second embodiment, the amount of calculation can be further reduced as compared with the first embodiment.

That is, as in this embodiment, in the X direction,
In the case of an elementary hologram panel that displays point images at equal intervals in the Y direction and the Z direction, Sx, S1, S2, and Sx obtained by calculation as described above are obtained.
Even if the respective element holograms to be recorded in S3, S4, S5, etc. are recorded in the same cell (Sx in this embodiment), the same element hologram panel as that of the first embodiment can be obtained. Can be made. Therefore, according to the second embodiment, it is possible to realize an element hologram panel with a smaller amount of calculation for obtaining an element hologram than in the first embodiment.

In the present embodiment, the element holograms may overlap with each other by simply superimposing them. However, there is no problem even if the position of the element holograms is slightly shifted. And the element holograms may be arranged so that they do not overlap.

Thereafter, in the same manner as in the first embodiment described with reference to FIGS. 6 to 11, the element hologram in the cell is obtained, and a three-dimensional moving image can be easily displayed. Element hologram panel can be realized.

[0053]

As described above, according to the present invention,
Since the elementary hologram panel can be configured only by calculating a part of the panel and arranging it repeatedly, the number of calculations by the computer is reduced, and a large-screen three-dimensional display can be performed in real time.

Further, the light acting on the element hologram is 3
Various point images can be displayed for each element hologram by the characteristics of each diffraction grating created based on the two-dimensional image data, and the output light can be controlled by the control means. The means can be adapted according to the content, and a display more realistic can be realized. For example, it is possible to perform control so that diffracted light is not output in a hiding direction in order to realize a display unit that should be hidden from a certain viewpoint. Therefore, it is possible to cope with many display contents and viewpoints.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a state in which a three-dimensional image is displayed by point image display of an element hologram panel according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view showing a state when a part of the element hologram panel is viewed from a point image display side.

FIG. 3 is a schematic perspective view for explaining the principle of point image display by the element hologram panel.

FIG. 4 is a partially enlarged view showing a part of the element hologram panel when a point image is displayed as viewed from the side, and is an explanatory diagram for describing a recording range of the element hologram.

FIG. 5 is a partially enlarged view showing a part of the element hologram panel when six point images are displayed in the X direction and two point images are displayed in the Z direction when viewed from the side.

FIG. 6 is a partial perspective view showing a part of the element hologram panel when eight point images are displayed.

FIG. 7 is a partially enlarged view showing a part of the element hologram panel when two point images are displayed on the same axis in the Z direction when viewed from the side.

FIG. 8 is a diagram showing an arrangement example of element holograms in an element hologram panel displaying two point images.

FIG. 9 is a diagram showing an arrangement example of element holograms in a single cell in which overlapping element holograms are moved and arranged.

FIG. 10 is a diagram showing an arrangement example of element holograms in a single cell when displaying eight point images.

11 is a diagram illustrating a display example of a 5 × 5 cell array of FIG. 9 and a point image when the cells are arrayed.

FIG. 12 is a partially enlarged view showing a state when three point images are displayed in the same axial direction in the Z direction in the element hologram according to the second embodiment, as viewed from the side.

FIG. 13 is an explanatory diagram for describing element holograms recorded in the same cell in the second embodiment.

FIG. 14 is a schematic diagram showing a configuration of a conventional real-time hologram display.

FIG. 15 is a schematic diagram illustrating a configuration of a diffraction grating array used in a conventional stereoscopic display device.

FIG. 16 is a schematic diagram showing a configuration of a stereoscopic display device using the diffraction grating array of FIG.

[Explanation of symbols]

11,61 element hologram panel 12 3D image 21,101 cell 22,31,33,35,41,43,51,52,5
3,54,55,56131,132 Point image 36-element hologram

Claims (5)

[Claims] An element hologram panel in which a plurality of element holograms for displaying a plurality of point images constituting a three-dimensional image are arranged, wherein a cell forming one unit from a plurality of element holograms for displaying different point images is provided. An element hologram panel comprising a plurality of arrays. 2. The element hologram panel according to claim 1, wherein the size of the cell is equal to a distance between a plurality of point images on a plane parallel to the element hologram panel. 3. The apparatus according to claim 2, wherein a plurality of cells having the same arrangement of element holograms are arranged.
An element hologram panel according to item 1. 4. The element hologram panel according to claim 2, wherein an interval between a plurality of point images and a size of the cell in a plane parallel to the element hologram panel are equal in the same direction. 5. A method for recording an element hologram used in an element hologram panel according to claim 1, wherein a plurality of points are displayed on the same axis in a direction perpendicular to the element hologram panel. A method for recording an element hologram, wherein element holograms to be recorded in different cells for an image are recorded in the same cell.