JP2002258215A - Stereoscopic image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an observation of a natural stereoscopic image by satisfying a super-multiple eye condition. SOLUTION: Picture images of a subject is taken at certain intervals in a fan like shape. The taken parallactic images are displayed as original images onto LCDs 23 each located within projection unit optical systems 20-1 to 20-n, which are aligned in a fan like shape, opposing a concave mirror 31. Light emitted from light sources 21 within each projection unit optical systems 20-1, etc., is condensed by condenser lenses 22 on projection lenses 24, and the projection lenses 24 then project and image an LCD display image on the face of the concave mirror 31. By condensing the light again by the concave mirror 31 and by locating the eyes 41L and 41R on condensing positions, a whole image can be obtained. Because a plurality of parallactic images enter into the both eyes 41L and 41R, a natural stereoscopic image can be observed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the observation of a natural stereoscopic image by arranging a plurality of projection unit optical systems at a narrow angle interval in order to realize a stereoscopic image display satisfying the super multi-view condition. The present invention relates to a super multi-view stereoscopic image display device which realizes the above.

[0002]

2. Description of the Related Art A human perceives a three-dimensional space (that is, a three-dimensional space) by using only an image of light passing through pupils of left and right eyes from a continuous parallax of an actual object. 2. Description of the Related Art Conventionally, as a binocular parallax type stereoscopic image display device that does not require glasses, for example, a binocular type and a multi-view type are known. In the binocular stereoscopic video display device, one parallax image is provided to each of the left and right eyes, and a stereoscopic image is perceived using the two parallax images. In a multi-view type stereoscopic image display device, a stereoscopic image is perceived by using three or more parallax images. If the observation position is changed, images viewed from different directions can be observed.

[0003]

In the actual observation of the three-dimensional space, the focus adjustment (that is, the focus adjustment) of each of the right and left eyes,
The rotation of the left and right eyeballs (this is referred to as “convergence”) always works simultaneously in conjunction. However, in the conventional twin-lens stereoscopic video display device, the conditions of focus adjustment and convergence are not satisfied at the same time, and even if the observer changes the observation position, the observer can always observe only the image viewed from the same direction. In many cases, it causes illness and fatigue and makes you feel sick. In particular, this is remarkable when an image is displayed near 25 cm to 1 m.

On the other hand, a multi-view stereoscopic image display device has a problem of inconsistency between focus adjustment and convergence. However, if the observation position is changed, images viewed from different directions can be observed. However, in an actual three-dimensional space, the image continuously changes, whereas in the multi-view system, the image changes discretely, which causes an uncomfortable feeling and fatigue to the observer. SUMMARY OF THE INVENTION The present invention provides a super multi-view stereoscopic image display device which satisfies a super multi-view condition capable of avoiding inconsistency between focus adjustment and convergence which is a problem in a conventional binocular or multi-view stereoscopic image display device. The purpose is to:

[0005]

In a super multi-view stereoscopic image display device satisfying the super multi-view condition, a plurality of parallax images are simultaneously input to one eye (this is called "monocular parallax"). When the observer focuses on the position of the image in space at this time, each parallax image is formed at the same position on the retina.
This is the same state as when focusing on a stereoscopic image actually existing in space, and there is a possibility that contradiction between focus adjustment and convergence can be avoided. The super multi-view condition refers to a display condition in which a plurality of parallax images having slightly different parallaxes are included in one eye, and if this condition is satisfied, the eye is adjusted to a stereoscopic image surface different from the image display surface. May be induced.

Hereinafter, the super multi-view condition will be described with reference to FIGS. 2 and 3. FIG. 2 is a conceptual diagram of stereoscopic display satisfying the super multi-view condition. A number of imaging means (for example, cameras) are arranged at the position of the virtual window 2 to photograph the object point 4 in the three-dimensional space, and images of the many cameras are simultaneously displayed on, for example, the screen 3. Here, the screen 3 is configured such that only the image of the corresponding camera is observed by the left eye 1L and the right eye 1R from each virtual window 2. What is super multi-view condition?
The interval (ie, the parallax image interval) d of the virtual window 2 is equal to the eyes 1L and 1L.
This is a condition in which the pupils 1a of R are lined up at a smaller interval than the pupil diameter. In the case of the configuration of FIG. 2, the images of the left and right cameras are differently incident on the left eye 1L and the right eye 1R regardless of the position of the observer. The image of the object point 4 in the three-dimensional space can be viewed stereoscopically by the parallax.

Further, when the super multi-view condition is satisfied, not only that, but also the images of a plurality of cameras always enter the observer's monocular 1L, 1R. The plurality of images that have entered the pupils 1a of the eyes 1L and 1R overlap at a stage where they are formed on the retina 1b. When the observer moves left and right or up and down, the plurality of videos are gradually switched to the next video while overlapping. What the observer actually observes is the retina 1
Since the image is formed on the image b, the observer does not feel much switching of the image, and can observe the stereoscopic image of the object point 4 which naturally changes according to the observation position. In addition, under the super multi-view condition, there is a clue to guide the focus adjustment of the eyes 1L and 1R to a stereoscopic image.

FIGS. 3 (a) and 3 (b) are enlarged views of the right eye portion showing the focus adjustment of the right eye of FIG. 2, wherein FIG. 3 (a) is a screen surface, and FIG. It is a figure showing a position in space. As shown in FIG. 3A, when the focus adjustment is performed on the surface of the screen 3, two parallax images 5-1 and 5-1 are displayed.
5-2 is projected as a multiple image at different locations on the retina 1b. On the other hand, as shown in FIG. 3B, when the focus is adjusted to a position in the three-dimensional space, the two parallax images 5-1 and 5-2 are projected on the same place on the retina 1b. Is done. For this reason, by the stereoscopic display that satisfies the super multi-view condition,
An adjustment stimulus for guiding the focus adjustment of the eyes 1L and 1R to a stereoscopic image in space can be generated.

In order to provide a super multi-view stereoscopic image display device which satisfies the above super multi-view condition, in the first invention of the present invention, an optical element which functions as a special screen is provided. A component and a plurality of projection unit optical systems that are arranged at small angular intervals so that their optical axes pass through the center of the optical component, and project an image onto the optical component surface in a superimposed manner.

Each of the projection unit optical systems includes a spatial light modulator (Spatial Light Modulator, hereinafter referred to as “SLM”) for displaying a parallax image obtained by capturing an object at the angular interval as an original image, and the SLM. A light source that illuminates the displayed original image and emits light at a small portion, a condenser lens that condenses the image of the small light source at a predetermined position, and the illuminated original arranged at or near the predetermined position. A projection lens for forming an image on the optical component surface. Further, the optical component is configured to form an array of the images of the small light source in the vicinity of the position of the eye of the observer who views the vicinity of the optical component at an interval smaller than the pupil diameter of the eye. .

According to a second aspect, in the stereoscopic image display apparatus according to the first aspect, an optical path changing component for changing an optical path is provided between the optical component and the position of the observer's eye.
By adopting such a configuration of the first or second aspect of the present invention, the projection lens in each projection unit optical system allows S
The original image displayed on the LM is projected and formed on the optical component surface. At the same time, an image of a small light source illuminating the SLM is formed by the condenser lens at the center of the projection lens or slightly before. The image of this small light source is directly by the optical component or through the optical path changing component,
Multiple small light spots are imaged in the pupil of the observer's eye located within the viewing zone. As described above, a plurality of parallax images having slightly different parallaxes simultaneously enter the pupil of the observer's eye, so that the entire image displayed by the projection unit optical system can be seen. Then, when a plurality of parallax images enter each of the left and right eyes, a natural stereoscopic image is observed.

According to a third aspect of the present invention, in the stereoscopic image display device according to the first or second aspect, the plurality of projection unit optical systems are arranged in a fan shape at the small angular interval around a center of the optical component as a rotation center. Or they are arranged on a spherical surface. As a result, the viewing area is widened, and even when the observer moves, a stereoscopic image in a direction corresponding to the movement can be seen. The fourth invention is directed to the first to fourth aspects.
In the stereoscopic image display device according to any one of the third inventions, the optical component or the plurality of projection unit optical systems detects a movement of the eye of the observer, and follows the movement of the eye based on the detection result. Then, the optical component is rotated around the center of the optical component.

According to a fifth aspect of the present invention, in the stereoscopic image display device according to the second or third aspect, the optical path changing component detects the movement of the eye of the observer, and determines the movement of the eye based on the detection result. The optical path changing component is configured to rotate around the center of the optical path changing component. By adopting such a configuration of the fourth or fifth aspect, if the observer moves, the movement of the observer's eye is detected, and the optical component follows the movement of the eye based on the detection result. , One of the optical path changing components or the plurality of projection unit optical systems is rotated. Therefore, the number of projection unit optical systems can be reduced.

According to a sixth aspect of the present invention, in the stereoscopic image display device according to the second or third aspect, only the optical component and the optical path changing component, or these and the plurality of projection unit optical systems are connected to the observer. The configuration is such that the movement of the eye is detected, and based on the detection result, the optical component follows the movement of the eye and rotates about the center of the optical component as the rotation center. As a result, only the optical component and the optical path changing component rotate following the movement of the observer's eye, or the plurality of projection unit optical systems rotate with them, so that the number of the plurality of projection unit optical systems can be reduced. I can do it.

According to a seventh aspect, in the stereoscopic image display device according to any one of the first to sixth aspects, the optical component is:
It is composed of any one of a concave mirror, Fresnel mirror, Fresnel lens or hologram optical element. According to an eighth invention, in the stereoscopic video display device according to any one of the second to sixth inventions, the optical path changing component is constituted by a half mirror. By adopting such a configuration of the seventh or eighth aspect, the image projected on the concave mirror, Fresnel mirror, Fresnel lens or hologram optical element enters the eye of the observer directly or via a half mirror. I do.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) As an example of a super multi-view stereoscopic video display device satisfying super multi-view conditions, a stereoscopic video display device using a fan-shaped arrangement of projection optical systems will be described ((1)). )-(3)). (1) Fan-like Array of Proj
Section Optics) (hereinafter referred to as “FAPO
Method ". 4) FIGS. 4 (a) and 4 (b) show F of the first embodiment of the present invention.
FIG. 2 is a diagram showing the basic principle of the APO method, wherein FIG.
(B) is a diagram showing a projection system. FIG.
FIG. 3 is a diagram showing a projection unit optical system. In the present embodiment, for example, FAP considering only the parallax in the horizontal direction is considered.
The O method will be described.

As shown in FIG. 4A, in the image pickup system, a plurality of image pickup means (for example, video cameras) 10-1 to 10 are provided.
By -n, the subject 11 is photographed in a fan shape at a constant interval. The parallax images taken by the video cameras 10-1 to 10-n are used as original images in the projection system shown in FIG.
As shown in FIGS. 4B and 5, in the stereoscopic image display device that is a projection system, a plurality of projection unit optical systems 20-1 to 20-1.
20-n, an optical component (for example, a concave mirror) 31 and a light path changing component (for example, a half mirror) 32 that function as a special screen. The plurality of projection unit optical systems 20-1 to 20-n are arranged in a fan shape around the center of the concave mirror 31 at the same angular interval as the plurality of video cameras 10-1 to 10-n.

Each of the projection unit optical systems 20-1 to 20-n
Is a light source (a white light source in the case of displaying a color image) 21 having a small light-emitting portion, a condenser lens 22 for condensing light from the light source 21, and each video camera 10-1 to 10-
SLM that displays the parallax image taken with n as the original image
(For example, a liquid crystal display panel for color display or monochrome display, hereinafter referred to as “LCD”) 23 and a projection lens 24
And these are arranged in order.

The condenser lens 22 includes a small light source 21
This lens illuminates the original image displayed on the LCD 23 by inputting the light from the light source 21 and forms an image of the small light source 21 at the center of the projection lens 24 or slightly before the center. When the image of the small light source 21 is formed slightly before the projection lens 24 by the condenser lens 22, an opening or a pinhole may be provided at the image forming position in order to reduce the spread of light. The projection lens 24 is a lens that projects and illuminates the illuminated original image of the LCD 23 onto the surface of the concave mirror 31.

The concave mirror 31 converts the image of the small light source 21 incident from the projection lens 24 into the image of the observer 4 located within the viewing zone.
The pupil 41a of the left and right eyes 41L and 41R has a function of forming a plurality of images as a small converging point (that is, a light spot) or a vertical line. In FIG. 4B and FIG. 5, since the display image exists in the incident light beam of the concave mirror 31 and cannot be observed by the observer 40, the observation position is changed by inserting the half mirror 32 to change the optical path. .

Next, the operation of the projection system will be described. Light emitted from the light source 21 in each of the projection unit optical systems 20-1 to 20-n is collected by the condenser lens 22,
The original image displayed on the LCD 23 is illuminated, and the image of the small light source 21 is formed at the center of the projection lens 24 or slightly before this. The original image displayed on the LCD 23 is
The projection lens 24 projects an image on the surface of the concave mirror 31 through the half mirror 32. Then, the light is condensed again by the concave mirror 31, reflected by the half mirror 32, and the left eye 41L and the right eye 41R of the observer 40 located in the viewing zone.
Is formed on the retina 41b through the pupil 41a. That is, the observer 40 can see the entire display image 11A by placing the eyes 41L and 41R on the light spot from the half mirror 32. This is called so-called “Maxwellian view”. The observer 40 observes a parallax image corresponding to the left eye 41L and the right eye 41R within a predetermined viewing zone, and perceives a stereoscopic image by binocular parallax. Both eyes 41
If a super multi-view condition in which a plurality of parallax images enter each of L and 41R is satisfied, a natural stereoscopic image can be observed.

(2) Configuration of the FAPO system FIGS. 1A and 1B show a first embodiment of the present invention.
1A and 1B are configuration diagrams of an APO stereoscopic image display device. FIG. 1A is an overall diagram, and FIG. 1B is a diagram illustrating a state in which two parallax images are incident on a single eye on an observation surface. In addition,
In FIG. 1A, the half mirror 32 in FIGS. 4B and 5 is omitted for simplicity of description.

Hereinafter, the FA will be described so as to satisfy the super multi-view condition.
The conditions (A) to (E) for determining the arrangement of the PO method will be described. (A) Observation distance An observation distance r from the center of the concave mirror 31 to the observer 40 on the observation surface 42 is set. For example, when the observer 40 observes a stereoscopic image while sitting on a chair, the observation distance r is set to about 650 mm, assuming the distance from the observer 40 to the monitor when using a personal computer.

(B) Display image size For example, NTSC (National Television System Commi
ttee) In the case of a video system, since the aspect ratio of the display size of the LCD is 4: 3, the display image size S is also a rectangular opening equal to the ratio, and a diagonal of about 14 to 17 inches is considered.

(C) Arrangement of Projection Unit Optical System FIG. 6 shows two projection unit optical systems (for example, 2
0-1 and 20-2). As shown in FIG. 1B, assuming that the pupil diameter E of the pupil 41a surrounded by the iris 41c is, for example, 4 mm in the left eye 41L and the right eye 41R of the observer 40, the super multi-view condition is satisfied. Shows two parallax images (that is, the light source image 21A of the light spot).
It must be displayed at an interval d of less than mm. For that purpose, it is necessary to consider the interval between the projection unit optical systems 20-1, 20-2,. The distance between the projection unit optical systems 20-1, 20-2,... Depends on the width of the LCD 23 in the projection unit optical systems.

As shown in FIG. 6, for example, if the width D of the available full-color LCD 23 needs to be about 40 mm to 50 mm, the magnification of the light source image 21A by the concave mirror 31 is about 1/20 to 1/25. Need to be That is,
The distance R (= r × D / d) from the point where the light from the light source 21 is condensed by the condenser lens 22 (the position near the projection lens 24) to the center of the concave mirror 31 is represented by D of the observation distance r.
By setting / d times, stereoscopic display that satisfies the super multi-view condition is possible.

In the three-dimensional image display device satisfying the super multi-view condition, when the size of the SLM (for example, the LCD 23) is as large as several inches, the projection unit optical system 20-1,
20-2, ... is a few meters long, but NTS
If an SLM having a large number of pixels and a screen size of about 1 inch is used as compared with the C standard SLM, the overall length can be shortened. In this case, the projection unit optical system 20-
Some or all of 1, 20-2,... Can be integrated.

(D) Size of Light Source Image on Observation Surface The intensity distribution of the light source image 21 A on the observation surface 42 is
Due to the influence of the aberration (1), the distance from the optical axis of the concave mirror 31 increases.
When the light source image 21A becomes larger than the pupil diameter E, the entire display image from the projection unit optical systems 20-1, 20-2,. When the light source image 21A becomes larger than the parallax image interval d, the adjacent projection unit optical systems 20-
Are observed as a multiple image among 1, 20-2,. Therefore, it is necessary that the intensity distribution of the light source image 21A on the observation surface 42 be substantially within the parallax image interval d.

(E) Viewing area (moving range of observer) FIG. 7 is an explanatory diagram of the viewing area of the projection unit optical system of FIG. If a plurality of parallax images are respectively incident on the left eye 41L and the right eye 41R of the observer 40, a natural stereoscopic image can be observed. Here, consider the case where the observer 40 moves as follows.

(I) When moving in the direction perpendicular to the observation direction (horizontal direction and vertical direction) (ii) When moving in the observation direction (front-back direction) A plurality of observers 40 observe at the same time or one observer 4
In order for a stereoscopic image to be seen even if 0 moves greatly, a large number of projection unit optical systems 20-1 to 20-n are arranged in a large area on a spherical surface 43 about the center of the concave mirror 31 as a rotation center to form a viewing zone 44. Need to be wider.

However, in order to widen the viewing area 44, for example, 400 mm (horizontal direction) × 200 mm
If the (vertical direction) visual field 44 is to be realized at an interval of 2 mm, 200 × 100 = 20,000 projection unit optical systems 20-1 to 20-n are required. The intervals can be considered continuous rather than discrete.)

In the present embodiment, the projection unit optical systems 20-1 to 20-n are arranged in a fan shape while considering only the horizontal direction which is more important in stereoscopic image observation than the vertical direction. Projection unit optical systems 20-1 to 20-n
Becomes 200. Of course, if the viewpoint tracking method shown in FIG. 8 described later is introduced, this number can be reduced to several to several tens. Thereby, the projection unit optical systems 20-1 to 20-1
20-n can be reduced. in this way,
The viewing area 44 in the horizontal direction is determined by the number of the projection unit optical systems 20-1 to 20-n (= the number of parallaxes) and the parallax image interval d.

(3) Effects of FAPO method ((a)-
(E)) (a) In order to satisfy the super multi-view condition in which a plurality of parallax images are included in one eye 41L, 41R, the eyes 41L, 41R are placed on a three-dimensional image (that is, display image 11A) surface different from the image display surface. Is adjusted, and the observer 40 can observe a stereoscopic image. Further, since a super multi-view condition in which a plurality of parallax images are incident on both eyes 41L and 41R is satisfied, a natural stereoscopic image can be observed.

(B) A plurality of projection unit optical systems 20-
Since 1 to 20-n are arranged in a fan shape, even if the observer 40 moves within the predetermined viewing zone 44 in the horizontal direction perpendicular to the observation direction, a small number of the projection unit optical systems 20-n
A stereoscopic image can be observed by 1 to 20-n. (C) When the observer 40 moves in a vertical direction perpendicular to the observation direction, a stereoscopic image cannot be observed. However, if a diffusing plate (for example, a lenticular lens or the like) for expanding the vertical viewing zone is added to the concave mirror 31, Even if the observer 40 moves in the vertical direction, a stereoscopic image can be observed.

(D) If a special aspherical concave mirror (for example, a parabolic mirror) for reducing aberration is used as the concave mirror 31, a natural stereoscopic image closer to the observation of a real object can be observed. (E) Although the concave mirror 31 is used as an optical component that functions as a special screen, a flat Fresnel mirror may be used instead. Such a Fresnel mirror has the same image forming function as the concave mirror 31, so that the observer 40 can observe a stereoscopic image.

(Second Embodiment) As shown in FIG. 7, if a large number of projection unit optical systems 20-1 to 20-n are arranged on a spherical surface 43 with the center of the concave mirror 31 as the center of rotation, the visual field 44 Range can be expanded. Therefore, a plurality of observers 4
Even if 0 is observed at the same time or one observer 40 moves greatly (in the horizontal and vertical directions perpendicular to the observation direction, and also moves in the front-back direction with respect to the observation direction), the stereoscopic image in the viewing zone 44 is obtained. Can be seen exactly. However, in the present embodiment, the number of the projection unit optical systems 20-1 to 20-n increases.

(Third Embodiment) FIG. 8 shows a third embodiment of the present invention.
FIG. 1 is a configuration diagram of a viewpoint-following stereoscopic video display device of the FAPO method showing the embodiment. For example, when the number of the observer 40 is one, the detection unit 45 such as a video camera, an infrared sensor, a magnetic sensor, or an ultrasonic sensor detects the eye 41 of the observer 40.
The movement of the L and 41R is detected, and based on the detection result, the driving means 46 such as a motor follows the movement of the eyes 41L and 41R and sets only the concave mirror 31 around the projection center which is the center of the concave mirror 31 as the rotation center. Rotation, rotation of concave mirror 31 and half mirror 32, projection unit optical systems 20-1 to 20-20
Rotate only −n or rotate the entire stereoscopic video display device. Alternatively, following the movement of the eyes 41L and 41R, the half mirror 32 is rotated about the center of the half mirror 32 as a rotation center. With such a configuration, the viewing zone 44 can be expanded by reducing the number of the projection unit optical systems 20-1 to 20-n as described above.

(Fourth Embodiment) FIG. 9 shows a fourth embodiment of the present invention.
1 is a configuration diagram of a stereoscopic image display device according to an embodiment. With respect to the optical axis of the concave mirror 31, the projection unit optical system 20-1,
Are shifted, and the observation position of the observer 40 can be shifted from the projection position, whereby the half mirror 32 can be omitted. By omitting the half mirror 32, the configuration of the stereoscopic video display device can be simplified.

(Fifth Embodiment) FIG. 10 is a configuration diagram of a stereoscopic video display apparatus using a Fresnel lens according to a fifth embodiment of the present invention. A flat Fresnel lens 47 may be used instead of the concave mirror 31 of FIG. 9 as an optical component that functions as a special screen. In this case, the observer 40 is located behind the Fresnel lens 47. The Fresnel lens 47 has the same imaging function as the convex lens, and allows the observer 40 to observe a stereoscopic image.

(Sixth Embodiment) FIGS. 11A and 11B
FIGS. 7A and 7B are configuration diagrams of a stereoscopic image display device using a hologram optical element according to a sixth embodiment of the present invention, wherein FIG. 7A is a plan view and FIG. 7B is a side view. As an optical component that functions as a special screen, a flat hologram optical element 48 may be used instead of the concave mirror 31 in FIG. By using the hologram optical element 48, the observer 40 located on the back side can observe a stereoscopic image.

(Modifications) The present invention is not limited to the above embodiment, and various modifications are possible. For example, there are the following modifications (a) to (d). (A) Concave mirror 31, Fresnel mirror, Fresnel lens 4
7, or other than the hologram optical element 48 may be used. (B) As an optical path changing component, other than the half mirror 32, a prism, another optical path changing element, or the like may be used, or these may be provided in the apparatus shown in FIGS.

(C) Projection unit optical systems 20-1 and 20-2
0-n may be configured by something other than the illustration, for example, by configuring the SLM with something other than the LCD 23. Further, other optical elements can be added. For example, the projection unit optical system 20-
A combiner or the like may be provided for 1 to 20-n. (D) The detecting means 45 and the driving means 46 in FIG.
11 to 11 may be applied.

[0043]

As described in detail above, according to the first aspect, the original image is projected onto the optical component by the projection unit optical system, and the image of the small light source is located in the visual field by the optical component. Since a plurality of images are formed as light spots in the pupil of the observer's eye, the super multi-view condition is satisfied, and the eye is guided to a stereoscopic image plane different from the image display surface, and the observer can view the stereoscopic image. Can be observed. Furthermore, if a super multi-view condition in which a plurality of parallax images enter both eyes is satisfied, a natural stereoscopic image can be observed.

According to the second aspect, since the optical path changing component is provided, the setting of the observation position can be easily changed. According to the third aspect, when a plurality of projection unit optical systems are arranged in a fan shape, a small number of the moving units may move within a predetermined viewing zone in a plane perpendicular to the observation direction (the direction in which light travels). A stereoscopic image can be observed by the projection unit optical system. Further, when a plurality of projection unit optical systems are arranged on a spherical surface, no matter what direction the observer moves in a predetermined viewing zone,
A stereoscopic image can be observed.

According to the fourth to sixth aspects of the present invention, the optical parts and the like are rotated following the movement of the observer's eye, so that a small number of projection unit optical systems can view a stereoscopic image. The range of the area can be expanded. According to the seventh aspect, since the optical component is configured by any one of the concave mirror, the Fresnel mirror, the Fresnel lens, and the hologram optical element, the optical component can be configured relatively easily. According to the eighth aspect, since the optical path changing component is constituted by the half mirror, the setting of the observation position can be changed with a simple structure.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a stereoscopic video display device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of stereoscopic display satisfying a super multi-view condition.

FIG. 3 is an enlarged view of a right eye portion showing a focus adjustment of FIG. 2;

FIG. 4 is a diagram illustrating a basic principle of a FAPO method according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a projection unit optical system of FIG. 4;

FIG. 6 is a layout diagram of the two projection unit optical systems of FIG. 1;

FIG. 7 is an explanatory diagram of a viewing zone in FIG. 6;

FIG. 8 is a configuration diagram of a viewpoint-following three-dimensional image display device of the FAPO system showing a third embodiment of the present invention.

FIG. 9 is a configuration diagram of a stereoscopic image display device according to a fourth embodiment of the present invention.

FIG. 10 is a configuration diagram of a stereoscopic video display device using a Fresnel lens according to a fifth embodiment of the present invention.

FIG. 11 is a configuration diagram of a stereoscopic image display device using a hologram optical element according to a sixth embodiment of the present invention.

[Explanation of symbols]

 1L, 41L Left eye 1R, 41R Right eye 1a, 41a Pupil 1b, 41b Retina 2 Virtual window 3 Screen 4 Object point in three-dimensional space 5-1, 5-2 Parallax image 10-1 to 10-n Video camera 11 Subject 11A Display image 20-1 to 20-n Projection unit optical system 21 Light source 21A Light source image 22 Condenser lens 23 LCD 24 Projection lens 31 Concave mirror 32 Half mirror 40 Observer 42 Observation surface 43 Spherical surface 44 Viewing area 45 Detecting means 46 Driving means 47 Fresnel lens 48 Hologram optical element d Parallax image interval E Pupil diameter r Observation distance R Projection unit optical system distance S Display image size

Claims (8)

[Claims] An optical component acting as a special screen, and respective optical axes are arranged at a small angular interval so as to pass through the center of the optical component, and an image is projected onto the optical component surface in a superimposed manner. A plurality of projection unit optical systems, wherein each of the projection unit optical systems includes: a spatial light modulator that displays a parallax image obtained by capturing an object at the angular interval as an original image; and an original light that is displayed by the spatial light modulator. A light source that illuminates the image and emits light at a small portion; a condenser lens that condenses the image of the small light source at a predetermined position; and a light source configured to dispose the illuminated original image at or near the predetermined position. A projection lens that forms an image on a component surface, wherein the optical component arranges the image of the image of the small light source in the vicinity of the position of the observer's eye looking in the vicinity of the optical component, and the pupil diameter of the eye. Image at small intervals Stereoscopic image display device being characterized in that a configuration in which. 2. The stereoscopic video display according to claim 1, further comprising an optical path changing component for changing an optical path between the optical component and a position of an eye of the observer. apparatus. 3. The projection unit optical system according to claim 1, wherein the plurality of projection unit optical systems are arranged in a fan shape or on a spherical surface at the small angular interval with the center of the optical component as a center of rotation. 3D image display device. 4. The optical component or the plurality of projection unit optical systems detects the movement of the eye of the observer and follows the movement of the eye based on the detection result to rotate the center of the optical component. The three-dimensional image display device according to any one of claims 1 to 3, wherein the three-dimensional image display device is configured to rotate as a center. 5. A configuration in which the optical path changing component detects movement of the eye of the observer and follows the movement of the eye based on the detection result, and rotates around the center of the optical path changing component as a rotation center. The three-dimensional image display device according to claim 2 or 3, wherein: 6. The optical component and the optical path changing component alone, or these and the plurality of projection unit optical systems detect the movement of the eye of the observer and follow the movement of the eye based on the detection result. 4. The stereoscopic image display device according to claim 2, wherein the optical component is configured to rotate around the center of the optical component. 7. The stereoscopic image display according to claim 1, wherein the optical component is configured by any one of a concave mirror, a Fresnel mirror, a Fresnel lens, and a hologram optical element. apparatus. 8. The three-dimensional image display device according to claim 2, wherein the optical path changing component is constituted by a half mirror.