JPH07134537A - Stereoscopic display - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding a stereoscopic display device using holograms,
Even with a low-resolution hologram pattern, a wide visual area of a stereoscopic image can be obtained. [Structure] A plurality of reproduction light generating means (1) and (2) for generating reproduction light for a hologram and phase distribution of a hologram pattern corresponding to each reproduction light (10) and (11) are time-divided or space-divided. And a phase distribution display means (3) for displaying, and the visual area obtained by each reproduction light (10), (11) is expanded from the visual area obtained by a single reproduction light. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic display device using a hologram. A three-dimensional image can be reproduced by irradiating the hologram with coherent light such as laser light.

In a stereoscopic display device that reproduces a three-dimensional image in this way, the visual area of the stereoscopic image should be as wide as possible. The present invention provides a stereoscopic display device having a wide visual area.

[0003]

2. Description of the Related Art FIG. 7 shows a conventional hologram creating method and reproducing method. FIG. 7 (a) shows a method of forming a hologram.

In FIG. 7A, 100 is a laser light source. Reference numerals 101, 102 and 103 are mirrors. The mirror 101 is semitransparent and transmits a part of incident light.

Reference numeral 104 denotes a lens for making the light reflected by the mirror 102 incident on the photographic dry plate 110. Reference numeral 105 denotes a lens, which causes the light reflected by the mirror 103 to enter the object 111.

Reference numeral 110 denotes a photographic dry plate which serves as a hologram. Reference numeral 111 denotes an object, which is an object for hologram production. Reference numeral 115 is a reference light, and a photographic plate 1
It is light that is directly output from the laser light source 100 that is incident on 10.

Reference numeral 116 denotes an object light, which is a laser light source 1
The light 00 is the light reflected by the object 111. In the optical system shown in the figure, the reference light 115 and the object light 116 interfere with each other to generate interference fringes on the photographic plate 110. In that way a hologram of the object 111 is obtained.

FIG. 1B shows a hologram reproducing method, in which an object 11 is reproduced by the hologram 110 created as described above.
A method of reproducing the stereoscopic image 125 of No. 1 will be described. In FIG. 7 (b), 120 is a laser light source, which is a light source of the hologram reproduction light.

Reference numeral 121 denotes a lens, which is a laser light source 1.
The output light of 20 is incident on the hologram 122. Reference numeral 122 denotes a phase distribution display means, such as a hologram created by the method of FIG. 7A, or a liquid crystal display means for displaying the phase distribution of the hologram pattern.

Reference numeral 123 is reproduction light, which is a laser light source 1.
It is output from 20. Reference numeral 124 denotes diffracted light, which is light (wavefront of diffracted light) obtained by diffracting the reproduction light 123 by the phase distribution display unit 122.

Reference numeral 125 is a stereoscopic image visually projected.
126 is an observer. By inputting the reproduction light 123 to the phase distribution display means 122 on the hologram 122 generated by the method of FIG. 7A, the diffracted light 124 is generated based on the displayed phase distribution display. As a result, diffracted light 1
A three-dimensional image 125 of the object 111 on which 24 hologram patterns are created is reproduced, and the reproduced three-dimensional image 125 is viewed by an observer 126 of the diffracted light.

[0012]

FIG. 8 is an explanatory diagram of a problem to be solved by the invention. In FIG. 8, 122 is a phase distribution display means, such as a hologram or a liquid crystal display means.

Reference numeral 124 is reproduction light. Reference numerals 130 and 131 denote diffracted light, and reproduction light 124 is used for the phase distribution display means 12.
It was diffracted at 2.

Reference numeral 132 denotes a visual area, which is the reproduction light 12
Reference numeral 4 denotes a range diffracted by the phase distribution display means 122, which represents a range in which an observer views a stereoscopic image. In a stereoscopic display device using a hologram, it is necessary to diffract the reproduction light 124 in a wide range in order to widen the visual area 132. For that purpose, it is necessary to display the spatial frequency of the pattern displayed on the phase distribution display means 122 as high as possible.

However, in the case of a hologram using a photographic plate, the resolution of displaying the spatial frequency of the pattern is limited by the size of the particles of the photographic plate, and when displaying the hologram pattern on the liquid crystal display means, etc. The spatial frequency is limited by the pitch or the like. Therefore, the resolution for the hologram pattern cannot be sufficiently obtained, and it is difficult to widen the visual area 132 for reproducing the stereoscopic image.

It is an object of the present invention to provide a stereoscopic display device capable of obtaining a wide visual area even with phase distribution display means having a limited resolution.

[0017]

According to the present invention, a plurality of reproduction lights and time division (a plurality of phase distributions are displayed in a time division manner) or space division (a plurality of phase distributions are divided and displayed in a display area). ), The phase distribution display means for displaying the phase distribution is provided so that the respective reproduction lights are incident at different angles. At that time, when reproducing a stereoscopic image by time division, the reproduction light output and the phase distribution display are synchronized so that the reproduction light corresponding to the displayed phase distribution is incident. Further, in the case of reproducing a stereoscopic image in a space-division manner, the incident light is selectively incident so that each reproduction light is incident on the phase distribution region of the reproduction light. In this way, the visual area obtained by each reproduction light is made larger than the visual area obtained by a single reproduction light.

FIG. 1 shows the basic configuration of the present invention. FIG. 1 shows a basic configuration when there are two reproduction lights, reproduction light A and reproduction light B. In FIG. 1, reference numeral 1 is a reproducing light A generating means.

Reference numeral 2 is a reproducing light B generating means. Reference numeral 3 is a phase distribution display means, such as a hologram or a liquid crystal display means. The phase distribution display means 3 displays the phase distribution of the reproduction light A and the phase distribution of the reproduction light B by time division or space division.

Reference numeral 10 is a reproduction light A. Reference numeral 11 is a reproduction light B. Reference numeral 15 denotes an area A, which is a diffraction area of the reproduction light A (10). Area A (15) is a visual area of a stereoscopic image based on the reproduction light (10).

Reference numeral 16 denotes a region B, which is a diffraction region of the reproduction light B (11). Area B (16) is a visual area of a stereoscopic image based on the reproduction light (11). Reference numeral 17 is a visual area C, which is an area A
This is a visual area obtained by combining (15) and area B (16).

Θa is the incident angle of the reproduction light A (10). θ
b is the incident angle of the reproduction light B (11). θa 'is the reproduction light A
Is the maximum diffraction angle of, and is the range of the visual region A.

Θb ′ is the maximum diffraction angle of the reproduction light B,
This is the range of the visual area B. It should be noted that θa and θb are set to θa × θb <0 with reference to the perpendicular line of the phase distribution display means 3.

[0024]

The operation of the basic configuration of FIG. 1 will be described. When switching the phase distribution display by time division, the selection of the reproduction light and the selection of the phase distribution display are synchronized. That is, when the phase distribution display means (3) is displaying the phase distribution for the reproduction light A (10), the reproduction light A (10) is made incident. As a result, the visual area of the stereoscopic image based on the reproduction light A (10) is obtained in the area A (15).

Next, the display of the phase distribution display means (3) is switched to the phase distribution display for the reproduction light B (11). And
The reproduction light B (11) is selected so that the reproduction light B (11) is incident. As a result, a region B (16) where a stereoscopic image can be viewed based on the reproduction light B (11) is obtained.

An enlarged visual area C (17) can be obtained by alternately repeating the above processing. Next, the operation in the case of performing the phase distribution display on the phase distribution display means 3 in a space division manner will be described.

In the case of displaying the phase distribution in a space division manner, the phase distribution display means (3) is used, for example, to display the phase distribution display area of the reproduction light A (10) and the phase distribution display area of the reproduction light B (11). They are arranged alternately in a plane. Then, the reproduction light A (10) is made incident on the display area of the phase distribution of the reproduction light A (10), and the reproduction light B (11) is made incident on the display area of the phase distribution of the reproduction light B (11). To In this way, the area A (15) is obtained by the diffracted light of the reproduction light A (10). Further, the region B (16) is obtained by the diffracted light of the reproduction light B (11). As a result, a visual area C (17) that is larger than the visual area obtained by a single reproduction light is obtained by the visual areas of the reproduction light A (10) and the reproduction light B (11).

The operation of the basic configuration of the present invention will be specifically described with reference to FIGS. FIG. 2 shows an operation explanatory diagram (1) of the basic configuration of the present invention in the case of enlarging the visual region by the time-divisional phase distribution display.

In FIG. 2, reference numeral 1 is a reproducing light A generating means. Reference numeral 2 denotes a reproducing light B generating means.

Reference numeral 3 denotes a phase distribution display means, which is composed of a liquid crystal display means or the like, and can rewrite the phase distribution display by time division. Reference numeral 10 is reproduction light A.

Reference numeral 11 is a reproduction light B. Reference numeral 15 denotes a region A, which is a visual region obtained by the diffracted light of the reproduction light A (10).

Reference numeral 16 is a region B, which is a visual region obtained by the diffracted light of the reproduction light B (11). 17 is a visual area C
That is, the enlarged visual area obtained by combining the area A (15) and the area B (16).

Reference numeral 20 denotes a phase distribution switching means, which alternately switches the phase distribution display of the reproduction light A and the reproduction light B displayed on the phase distribution display means 3. Reference numeral 21 is a reproduction light switching means for alternately switching the reproduction light output of the reproduction light A generating means 1 and the reproduction light output of the reproduction light B generating means 2.

Reference numeral 22 is a synchronizing means for synchronizing the switching of the phase distribution display of the phase distribution switching means 20 and the switching of the reproduction light output of the reproduction light switching means 21. The operation of the configuration of FIG. 2 will be described.

The phase distribution switching means 20 first displays the phase distribution of the reproduction light A (10) on the phase distribution display means 3 based on the synchronization signal output from the synchronization means 22. And
The reproduction light switching means 21 is controlled so that the reproduction light A generating means 1 outputs the reproduction light A (10) and the reproduction light B generating means 2 does not output the reproduction light B (11) in synchronization with this. To do. As a result, the reproduction light A (10) is diffracted in the phase distribution display means 3 to obtain the area A (15).

Next, the phase distribution switching means 20 displays the phase distribution of the reproduction light B (11) on the phase distribution display means 3 based on the synchronization signal. Then, the reproduction light switching means 21
In synchronism with this, the reproduction light B generating means 2 generates the reproduction light B (1
1) is outputted, and the reproducing light A generating means 1 is controlled so as not to output the reproducing light A (10). As a result, the reproduction light B (11) is diffracted in the phase distribution display means 3, and the area B (16) is obtained.

The above processes are alternately performed, for example, 3 per second.
The visual area C (1
7) is obtained. FIG. 3 shows an operation explanatory diagram (2) of the basic configuration of the present invention when the visual area is enlarged by space division.

In FIG. 3, reference numeral 1 is a reproducing light A generating means. Reference numeral 2 denotes a reproducing light B generating means.

Reference numeral 3 denotes a phase distribution display means, such as a hologram provided with different phase distribution display for each area, or a liquid crystal means for displaying different phase distribution for each pixel area.

Reference numeral 10 is a reproduction light A. Reference numeral 11 is a reproduction light B. Reference numeral 15 denotes an area A, which is a visual area obtained by the reproduction light A (10).

Reference numeral 16 is a region B, which is a visual region obtained by the reproduction light B (11). Reference numeral 17 denotes a visual area C, which is an enlarged visual area obtained by the reproduction light A (10) and the reproduction light B (11).

Numeral 25 is a reproduction light selecting means which makes only the reproduction light A (10) incident on the phase distribution display area 30 of the reproduction light A of the phase distribution display means 3 and displays the phase distribution of the reproduction light B. The reproduction light is selected so that only the reproduction light B (11) is incident on the region 31.

Reference numeral 30 denotes a phase distribution display area of the reproduction light A, which is provided with a phase distribution display of the reproduction light A (10).
Reference numeral 31 is a phase distribution display region of the reproduction light B.
This is an area provided with the phase distribution display of (11).

In the configuration of FIG. 3, the reproduction light A (10) and the reproduction light B (11) may be incident on the reproduction light selecting means 25 at the same time. The reproduction light selecting means 25 selects and transmits the reproduction light so that only the reproduction light A (10) is incident on the phase distribution display area 30 of the reproduction light A and reproduces the reproduction light B in the phase distribution display area 31 of the reproduction light B. The reproduction light is selected and transmitted so that only B (11) is incident. As a result, a region A (15) in which a stereoscopic image is reproduced by the diffraction of the reproduction light A (10) is obtained, and a region B (16) in which a stereoscopic image is reproduced by the diffraction of the reproduction light B (11) is obtained. Reproduction light A phase distribution display area 30 and reproduction light B phase distribution display area 31
If the size of C is set to be sufficiently small, the visual region C that can reproduce a continuous stereoscopic image of the region A (15) and the region B (16)
(17) is obtained.

According to the present invention, even when the resolution of the phase distribution display means 3 is limited, it is possible to realize a stereoscopic display device in which the visual area is greatly expanded.

[0046]

EXAMPLE FIG. 4 shows Example 1 of the present invention. FIG. 4 shows an embodiment configuration in the case of displaying the phase distribution by time division.

In FIG. 4, reference numeral 50 denotes a data input section for inputting three-dimensional image pickup data of an object. The data input unit 50 is a unit for inputting shooting data in real time from an imaging device or the like, or a magnetic recording device recording the shooting data, or the like.

Reference numeral 51 is a phase distribution creating unit which calculates and outputs a phase distribution reproduced by the reproduction light A and a phase distribution reproduced by the reproduction light B based on the data of the three-dimensional image. .

Reference numeral 52 denotes a sync signal generator which generates a sync signal for synchronizing the phase distribution display of the phase distribution generator 51 and the generated light output of the reproduction light generator 53. 5
Reference numeral 3 is a reproduction light generating means for alternately generating the reproduction light A and the reproduction light B by a synchronizing signal.

Reference numeral 54 is a phase distribution display means, such as a liquid crystal display means. Reference numeral 55 denotes a phase display drive section which drives the display of the phase distribution display means 54.

In the phase distribution creating unit 51, 60 is a phase distribution calculating unit for the reproduction light A, which calculates a phase distribution for reproducing a stereoscopic image by the reproduction light A based on the input data of the three-dimensional image, The display data of the phase distribution is created.

Reference numeral 61 denotes a reproduction light B phase distribution calculation unit, which calculates a phase distribution for reproducing a stereoscopic image by the reproduction light B based on input data of a three-dimensional image and creates display data of the phase distribution. To do.

Reference numeral 62 denotes a reproduction light A phase distribution holding unit, which is a memory (such as a magnetic disk device) for storing display data of the reproduction light A phase distribution. Reference numeral 63 denotes a phase distribution holding unit for the reproduction light B, which is a memory (magnetic disk device or the like) for storing display data of the phase distribution of the reproduction light A.

Reference numeral 64 denotes a phase distribution display switching section,
Reproduction light A phase distribution display and reproduction light B synchronized with the synchronization signal
The phase distribution display of is switched and output. In the reproduction light generation means 53, 70 is a light source driver for causing the reproduction light A light source 72 and the reproduction light B light source 73 to emit light.

Reference numeral 71 is a reproduction light switching section for switching the output of the reproduction light generating means 53 to the reproduction light A or the reproduction light B in synchronization with the synchronizing signal. 72 is reproduction light A
It is a light source.

Reference numeral 73 is a reproduction light B light source. The operation of the configuration of FIG. 4 will be described. The phase distribution creation unit 51 inputs the data of the three-dimensional image from the data input unit 50. The reproduction light A phase distribution calculation unit 60 calculates a phase distribution for reproducing a stereoscopic image by the reproduction light A based on the input three-dimensional image data, and creates display data of the phase distribution. And
The phase distribution holding unit 62 for the reproduction light A stores the display data.

The reproduction light B phase distribution calculation unit 61 calculates the phase distribution based on the input three-dimensional image data in order to reproduce the stereoscopic image by the reproduction light B, and creates the display data of the phase distribution. To do. Then, the reproduction light B phase distribution holding unit 63 stores the display data.

The sync signal generator 52 outputs a sync signal,
The phase distribution display switching unit 64 selects the display data of the phase distribution of the reproduction light A in synchronization with the synchronization signal. At this time,
The reproduction light switching unit 71 synchronizes with the synchronization signal and reproduces the reproduction light A.
When the light source 72 is selected, only the reproduction light A is output and the reproduction light B is output.
Will not be output. According to the next synchronization signal, the phase distribution display switching unit 64 selects the display data of the phase distribution of the reproduction light B, and the reproduction light switching unit 71 causes the reproduction light B light source 7
Select 3. Then, only the reproduction light B is output and the reproduction light A is not output.

The reproduction of the stereoscopic image by the reproduction light A and the reproduction of the stereoscopic image by the reproduction light B are alternately repeated. For example, by setting the repetition cycle to be about several tens of times per second, it is possible to reproduce a stereoscopic image of a wide visual area without being aware of switching the reproduction area.

FIG. 5 shows the configuration of the second embodiment of the present invention.
The case where the visual area is enlarged by the space distribution phase distribution display means is shown. FIG. 5 (a) is a sectional view.

In FIG. 5 (a), reference numeral 80 denotes a reproducing light A generating portion, for example, reproducing light A having a polarization plane in the vertical direction.
Is generated.

Reference numeral 81 denotes a reproducing light B generating portion, which generates the reproducing light B having a plane of polarization in the horizontal direction, for example. Reference numeral 82 is the reproduction light A.

Reference numeral 83 is the reproduction light B. Reference numeral 85 denotes a polarizer array which allows the vertically polarized and horizontally polarized reproduced light to pass through in units of regions, and is a region A (86) which is a vertical polarization filter and a region B (8 which is a horizontal polarization filter).
7) and are arranged alternately in a plane (see FIG. 6 (a)). The polarizer array is the reproduction light selecting means 2 of FIG.
Corresponds to 5.

Reference numeral 86 is a region A of the polarizer array 85, which is a region of the vertical polarization filter. 87 is a region B of the polarizer array 85, which is a region of the horizontal polarization filter. The size of the area A (86) and the area B (87) is, for example, in the unit of several mm, and is formed minute enough to maintain the continuity of the stereoscopic image by the diffraction of the reproduction light passing through each area. It is something.

Reference numeral 88 denotes a phase distribution display means, in which the phase distribution display area of the reproduction light A (area A (89)) and the phase distribution display area of the reproduction light B (area B (90)) alternate in a plane. Are arrayed in (see FIG. 6 (b)). The phase distribution display means 88 is composed of a hologram, a liquid crystal display means, and the like.

Reference numeral 89 is an area A of the phase distribution display means 88, which is a phase distribution display area of the reproduction light A. Reference numeral 90 denotes an area B of the phase distribution display means 88, which is a phase distribution display area of the reproduction light B.

FIG. 5 (b) is a perspective view, and the numbers common to FIG. 5 (a) indicate the common parts. FIG. 6 shows an embodiment of the polarizer array and the phase distribution display means of Embodiment 2 of the present invention. 85
Is a polarizer array.

Reference numeral 86 is a region A, which is a region of the vertical polarization filter. 87 is a region B, which is a region of the horizontal polarization filter. Reference numeral 88 is a phase distribution display means.

Reference numeral 89 designates a region A, which is a polarizer array 85.
This is an area for displaying the phase distribution of the reproduction light A that has passed through the area A (86). Reference numeral 90 denotes a region B, which is a region for displaying the phase distribution of the reproduction light B that has passed through the region B (87) of the polarizer array 85.

The operation of the configuration shown in FIGS. 5A and 5B will be described.
The reproduction light A (vertically polarized light) output from the reproduction light A generator 80 passes only through the area A (86) of the polarizer array 85,
The light enters the area A (phase distribution display area of the reproduction light A) 89 of the phase distribution display means 88. Then, the area A (8
In 9), the reproduction light A is diffracted to reproduce a stereoscopic image.

The reproduction light B (horizontal polarized light) generated by the reproduction light B generator 81 is applied to the area B (8) of the polarizer array 85.
Only 7) passes and enters the region B (phase distribution display region of the reproduction light B) 90 of the phase distribution display means 88. And
The reproduction light B is diffracted in the area B (90) to reproduce a stereoscopic image.

Area A (86) and area B (87) of the polarizer array 85 and area A (8 of the phase distribution display means 88).
9) If the area size of the area B (90) is formed to be, for example, about several mm, the stereoscopic image reproduced by the diffraction of the reproduction light passing through each area is continuous, and the stereoscopic image in which the visual area is enlarged. Can be reproduced.

In this embodiment, the reproduction light A and the reproduction light B are
Can be irradiated at the same time.

[0074]

According to the present invention, it is possible to realize a stereoscopic display device having a wide stereoscopic image visual area even with a hologram pattern having a low resolution by displaying reproduced light of a plurality of holograms and phase distribution display of the holograms. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention.

FIG. 2 is an operation explanatory diagram (1) of the basic configuration of the present invention.

FIG. 3 is an operation explanatory diagram (2) of the basic configuration of the present invention.

FIG. 4 is a diagram showing a first embodiment of the present invention.

FIG. 5 is a diagram showing a second embodiment of the present invention.

FIG. 6 is a diagram showing an embodiment of a polarizer array and a phase distribution display means according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of a conventional hologram creating method and reproducing method.

FIG. 8 is an explanatory diagram of a problem to be solved by the invention.

[Explanation of symbols]

 1: Generation means of reproduction light A 2: Generation means of reproduction light B 3: Phase distribution display means 10: Reproduction light A 11: Reproduction light B 15: Area A 16: Area B 17: Visual area C

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuko Sato 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (4)

[Claims] 1. A plurality of reproducing light generating means (1) and (2) for a hologram and a phase distribution of a hologram pattern corresponding to each reproducing light (10) and (11) are time-divided or space-divided. And a phase distribution display means (3) for displaying
A stereoscopic display device characterized in that the visual area obtained by (10) and (11) is larger than the visual area based on a single reproduction light. 2. The reproduction light A (10) and the reproduction light B (11) according to claim 1, wherein any one of the reproduction lights of a plurality of holograms is used.
And the incident angle to the phase distribution display means (3) is θ
a and θb, the spatial frequencies of the hologram pattern for the reproduced light A (10) and the reproduced light B (11) are fa and f, respectively.
b, the wavelengths of the reproduction light A (10) and the reproduction light B (11) are λ
When a and λb, sin θa = fa λa, sin θ
b = -faλa (where θa and θb are phase distribution display means)
The angle is based on the vertical direction of (3), and θa ・ θb <
0) A stereoscopic display device. 3. The reproduction light incident on the phase distribution display means (3) according to claim 1 or 2, wherein the phase distribution display means (3) displays different phase distributions by time division.
Reproduction light switching means (21) for switching between (10) and (11), phase distribution switching means (20) for switching the phase distribution displayed on the phase distribution display means (3), and reproduction light switching means (21)
A stereoscopic display device comprising: a synchronization means (22) for synchronizing the switching of the phase distribution switching means (20). 4. The phase distribution display means (3) according to claim 1 or 2, wherein the phase distribution of each hologram pattern corresponding to the plurality of reproduction lights (10) and (11) is spatially divided into different regions. The phase distribution display areas (30) and (31) for displaying are provided, and the reproduction lights (10) and (11) are respectively arranged in the phase distribution display areas.
A stereoscopic display device comprising reproduction light selecting means (25) for selecting the reproduction lights (10) and (11) so as to be incident on (30) and (31).