JPH09166762A - Streoscopic display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic display device capable of displaying a stereoscopic picture in a background without interrupting a field of view. SOLUTION: The device is constituted of a hologram screen 11 for recording a scatterer, an image projecting means 15 for spatially or timewisely dividing left-eye and right-eye images having parallax between them and spacially or timewisely alternately separating and projecting these images to the screen 11, and an image separating means (parallax barrier 21) for separating an image formed on the screen 11 into pixles 611 for the left-eye image and pixels 621 for the right-eye image and making the pixels 611, 621 incident upon the left and right eyes 811, 812 of an observer 81. In this case, the screen 11 is constituted of a transparent material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-purpose stereoscopic display device capable of visually recognizing a display image as a stereoscopic image and simultaneously visually recognizing a scene behind a screen.

[0002]

2. Description of the Related Art A stereoscopic display device capable of visually recognizing a display image as a stereoscopic image is a binocular stereoscopic method in which an image for the left eye and an image for the right eye are separately incident using eyeglasses, glasses, In addition to the parallax barrier method and the lenticular lens plate method using a parallax barrier or a lenticular lens plate instead of, there are a holography method and a volume scanning method. However, the holography method has many technically unsolved problems, and the volume scanning method has a drawback that the device becomes large in size.

[0003]

However, in all of the stereoscopic display devices, there is a screen or the like in front of the viewer that obstructs the field of view, and it is not possible to visually recognize the scene behind. The present invention has been made in view of such conventional problems, and provides a stereoscopic display device capable of displaying a desired display image so as to stereoscopically stand out in the outside scene without obstructing the field of view. It is what

[0004]

According to a first aspect of the present invention, a hologram screen recording a light scatterer, a left-eye image and a right-eye image having parallax are spatially or temporally divided, and Image projection means for projecting spatially or temporally separately on the hologram screen and projecting the image formed on the hologram screen into a left-eye image and a right-eye image, respectively for the left and right eyes of the viewer. In a stereoscopic display device having an image separation means for making incident light, the hologram screen is transparent.

The hologram screen acts as a light scatterer for light entering from a predetermined direction and operates as a normal screen, but acts as a transparent body for light entering from other directions. Transparent as it is. Therefore, if a display image is formed on the hologram screen from the predetermined direction via the image projection means, the display image can be viewed from a fixed direction according to the diffusion characteristic of the scatterer. The light that has entered the hologram screen from other directions passes through as it is, so that it does not hinder the visual recognition of the outside scene.

Further, the image projecting means according to the present invention divides the image for the left eye and the image for the right eye, and spatially or temporally alternately separates and projects them on the hologram screen. The image formed on the image is separated into a left-eye image and a right-eye image, and the left-eye image and the right-eye image are incident on the left and right eyes of the viewer. Therefore, since the viewer visually recognizes the left-eye image and the right-eye image with parallax with the left eye and the right eye, respectively,
You will see a three-dimensional image. Therefore, according to the display device of the present invention, a desired display image can be visually recognized as three-dimensionally floating in the outside scene without obstructing the field of view.

In the image projection means, for example, a left-eye image and a right-eye image provided with parallax are spatially divided,
There is one in which the divided pixels are spatially alternately separated and projected on the hologram screen. The image separating means corresponding to this includes, for example, a parallax barrier according to claim 2, a pinhole array according to claim 3, a lenticular lens plate according to claim 4, and a fly-eye lens according to claim 5. Etc.

Further, these image separating means are claimed in claim 6.
It may be recorded as a hologram in an independent hologram element as described above, or may be recorded as a hologram together with a scatterer in the hologram screen as a multiple hologram as described in claim 7.

Further, the image projection means includes one for temporally dividing an image for the left eye and an image for the right eye and projecting the hologram screen by alternately temporally separating them. The image separating means is, for example, claim
As described, there is a shutter that switches the light incident on the left eye and the light incident on the right eye in synchronization with the image projection means.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 In this embodiment, as shown in FIG. 1, a hologram screen 11 recording a light scatterer and a left-eye image 6 having a parallax are provided.
1 (FIG. 3) and the image 62 for the right eye (FIG. 3) are spatially divided and spatially alternately separated and projected on the hologram screen 11, and an image is projected on the hologram screen 11. An image separation unit (parallax barrier 21) that separates the image 60 (FIG. 3) into pixels 611 of the left-eye image 61 and pixels 621 of the right-eye image 62 and makes them incident on the left-eye 811 and the right-eye 812 of the viewer 81, respectively. The stereoscopic display device 1 has the hologram screen 11 and is transparent.

The image projection means 15 is a slide projector, and as shown in FIGS. 1 and 2, the light source 151 emits light to the slide film 152, and the signal light 31 recording the image 60 is emitted from the objective lens 153. Hologram screen 1
It is projected toward 1. Then, the image 60 is formed on the screen 11. Image 6 projected by the image projection means 15
0 indicates a left-eye image 61 and a right-eye image 62, as shown in FIG.
Is divided into vertically long pixels 611 and 621, and the pixels 611 and 621 are alternately arranged.

A transmissive hologram is formed on the hologram screen 11, and a scatterer 41 (FIG. 4) is recorded on this hologram. The image of the signal light 31 incident from the back at a predetermined angle is forwarded. Scatter towards. As shown in FIG. 1, the parallax barrier 21 separates the left and right pixels 611 and 621 included in the image 60,
The pixel 611 for the left eye is made incident on the left eye, and the pixel 621 for the right eye is made incident on the right eye.

As shown in FIG. 4, the hologram of the hologram screen 11 irradiates the same surface of the photosensitive material 40 with the object light 36 which is parallel light transmitted through the scatterer 41 and the diverging reference light 37. Can be formed.
The photosensitive material 40 is, for example, a dry plate coated with photopolymer, DCG (dichromated gelatin) or the like, and the scatterer 41.
Is, for example, frosted glass, opal glass, microlens, or the like, and a hologram screen can be created by performing the same embossing process.

Then, by irradiating the formed hologram with the same diverging light from the same direction as the reference light 37 of FIG. 4, the transmitted scattered light traveling in the direction of the object light 36 is reproduced. . The hologram screen 11 transmits the light as it is as a transparent body for the light entering from other directions.

Therefore, as shown in FIG. 5, if the hologram screen 11 is arranged on the back surface of the transparent show window 99 and the like and the display image is projected from the back surface side, the outside viewer 8
1 can see the inside of the store normally, and can also visually recognize a three-dimensional display image 65. Since the hologram screen 11 and the parallax barrier 21 are both transparent, the image 6 can be displayed without being aware of their existence.
Only 5 will appear to emerge in space.

Further, by providing the image projection means 15 with a feed mechanism for the slide film 152, the images 65 can be switched and displayed. Also, a moving image can be displayed by using an 8 mm film or a 35 mm film instead of the slide film 152 and continuously changing the image 65. Also, a stereoscopic moving image can be similarly displayed by using the video projector 15 as the video projector.

Since the holographic screen 11 is transparent, the holographic screen 15 is not noticed when the image is not displayed, and the show window 99 does not give a special discomfort. In addition, in this example, an example in which the real parallax barrier 21 is used as the image separating means is shown, but a hologram element in which the parallax barrier 21 is recorded may be used in place of the parallax barrier 21, and the parallax barrier 21 may be used. It is also possible to use a hologram screen 11 obtained by double exposure of 21.

By making the parallax barrier 21 into a hologram, the transparency of the screen can be made easier. When the parallax barrier 21 is recorded on a hologram, it can be realized by arranging the parallax barrier instead of the scatterer 41 of FIG. 4 and making the reference light 37 parallel light.

Embodiment 2 This is another embodiment in which the reflection type hologram is formed on the hologram screen in Embodiment 1. That is, as shown in FIG. 6, the object light 36 and the reference light 37 are irradiated from both sides of the photosensitive material 40 to form interference fringes on the photosensitive material 40 to manufacture a hologram. Then, by irradiating the hologram with the same light from the same angle as the reference light 37 of FIG. 6, the scattered light traveling in the direction of the transmitted light of the object light 36 is reproduced.

The image projection means is arranged on the front side of the hologram screen 11 (on the side of the viewer 81) in FIG. 2, and projects the display image obliquely upward from the lower side of the front surface. Others are the same as in the first embodiment.

Embodiment 3 This embodiment is different from Embodiment 1 in that, as shown in FIG. 7, a lenticular lens plate 22 is used instead of the parallax barrier.
It is another embodiment example in which is used. Then, due to the action of the minute lenticular lens 221 formed on the lenticular lens plate 22, the viewer 81
The left eye 811 visually recognizes the left eye pixel 611, and the right eye 812 visually recognizes the right eye pixel 612. Then, the viewer 81 visually recognizes a stereoscopic display image due to the parallax between the left-eye image 61 and the right-eye image 62.

By making the lenticular lens plate 22 a hologram, the transparency of the screen can be further increased. The lenticular lens plate 2
2 is recorded on the hologram, the scatterer 41 of FIG.
Alternatively, a lenticular lens plate may be arranged, and the reference light 37 may be parallel light.
Others are the same as those in the first embodiment.

Embodiment 4 As shown in FIG. 8, this embodiment is an example of a stereoscopic display device 1 by the binocular stereoscopic view. A viewer 81 uses filter glasses 231 and 232 (or image separation means) as image separation means. Wear the shutter glasses 241 and 242). The image projection means 16 has a projector 162 for the right eye and a projector 161 for the left eye, and the left and right filter glasses 2 are provided on the light emitting side of each of the projectors 161 and 162.
Filters 163, 164 (or shutter 16) similar to those of 31, 32 (or shutter glasses 241, 242)
5, 166) are arranged.

The filters 163, 164, and the filter glasses 231 and 232 have deflection filters and color filters, and the shutters 165 and 166 and the shutter glasses 241 and 242 have liquid crystal shutters that open and close the optical path using liquid crystal. is there. Then, the signal lights 311 and 312
Have different deflection angles and colors, or different emission timings. This example has the advantage that the viewing angle can be widened although there is the inconvenience of wearing glasses. Others are the same as those in the first embodiment.

[0025]

As described above, according to the present invention, it is possible to obtain a stereoscopic display device capable of displaying a desired display image so as to stereoscopically stand out in the outside scene without obstructing the field of view. .

[Brief description of the drawings]

FIG. 1 is a plan view of a stereoscopic display device according to a first embodiment.

FIG. 2 is a front view of the stereoscopic display device according to the first embodiment.

FIG. 3 is a diagram showing constituent elements of an image projected from the image projection means of the first embodiment.

FIG. 4 is a diagram showing an exposure process of the hologram screen according to the first embodiment.

FIG. 5 is a diagram showing an application example of the stereoscopic display device according to the first embodiment.

FIG. 6 is a diagram showing an exposure process of the hologram screen according to the second embodiment.

FIG. 7 is a plan view of the stereoscopic display device according to the third embodiment.

FIG. 8 is a plan view of a stereoscopic display device according to a fourth embodiment.

[Explanation of symbols]

 1. . . Stereoscopic display device, 11. . . Hologram screen, 15. . . Image projection means, 21. . . Paralux barrier (image separation means), 611, 621. . . Pixels, 81. . . Viewer, 811, 812. . . Left eye, right eye,

Claims (8)

[Claims] 1. A hologram screen in which a light scatterer is recorded, and a parallax-provided left-eye image and right-eye image are spatially or temporally divided and spatially or temporally alternated on the hologram screen. Image projection means for separately projecting the image onto the hologram screen, and image separation means for separating the image formed on the hologram screen into a left-eye image and a right-eye image and making them enter the left and right eyes of a viewer. The stereoscopic display device is characterized in that the hologram screen is transparent. 2. The image projecting means according to claim 1, wherein the image for the left eye and the image for the right eye are spatially divided and spatially alternately projected onto the hologram screen. A stereoscopic display device characterized in that the image separating means is a parallax barrier. 3. The image projection means according to claim 1, wherein the image projection means spatially divides an image for the left eye and an image for the right eye, and spatially alternately projects the image on the hologram screen. A stereoscopic display device characterized in that the image separating means is a pinhole array. 4. The image projection means according to claim 1, wherein the image projection means spatially divides an image for the left eye and an image for the right eye, and spatially alternately projects them onto the hologram screen. The stereoscopic display device, wherein the image separating means is a lenticular lens plate. 5. The image projection means according to claim 1, wherein the image projection means spatially divides an image for the left eye and an image for the right eye, and spatially alternately projects them onto the hologram screen. The stereoscopic display device, wherein the image separation means is a fly-eye lens. 6. The image projecting means according to claim 1, wherein the image for the left eye and the image for the right eye are spatially divided and spatially alternately projected onto the hologram screen. The stereoscopic display device, wherein the image separating means is a parallax barrier, a pinhole array, a lenticular lens plate, or a hologram element recording a fly-eye lens. 7. The image projecting means according to claim 1, wherein the image for the left eye and the image for the right eye are spatially divided and spatially alternately projected onto the hologram screen. The three-dimensional display device, wherein the image separating means is a hologram of a parallax barrier, a pinhole array, a lenticular lens plate or a fly-eye lens recorded together with a scatterer on the hologram screen as a multiple hologram. 8. The image projecting means according to claim 1, wherein the image for the left eye and the image for the right eye are temporally divided and alternately projected on the hologram screen. The stereoscopic display device, wherein the image separation means is a shutter that switches the light incident on the left eye and the light incident on the right eye in synchronization with the image projection means.