JP3080777B2 - Projection type stereoscopic display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type stereoscopic display using a lenticular plate as a screen.

[0002]

2. Description of the Related Art Conventionally, as this type of stereoscopic display device, for example, a technical report of the Television Society of Japan (VVI-63-
3, 1985) and "Technical Report of the Television Society of Japan (VV
I-88-42, 1988), an apparatus disclosed in "Experiment of optical system for expanding viewing area of multi-view three-dimensional image" is known. Such a three-dimensional display device is a three-dimensional display device using depth perception based on binocular parallax in the left-right direction. The principle of the three-dimensional display device is described, for example, in the publication “Depth Perception and Multi-View Display,“ Optics ”, Vol. 1
7, No. 7, 1988 ".

FIG. 4 shows a conventional example of such a three-dimensional display device. Here, a case where images from four directions are displayed will be described. Images of a certain three-dimensional object viewed from different directions are called parallax images in that direction. In FIG. 4, 4
Reference numerals 1 to 44 denote projector rows for projecting parallax images,
Reference numeral 9 denotes a lenticular screen having a diffuse reflection layer on the back surface. In FIG. 5, 1 is a certain three-dimensional object,
Reference numerals 21 to 24 denote camera rows for capturing images of the three-dimensional object viewed from different directions, that is, parallax images. Images photographed by the camera rows 21 to 24 are projected onto the lenticular screen 9 from the projector rows 41 to 44 arranged corresponding to the cameras in the same order.

FIG. 6 shows the lenticular screen 9.
FIG. 2 is an enlarged view of a lenticular plate and a diffuse reflection layer constituting the above-described embodiment. 6, reference numeral 7 denotes a lenticular plate, 6 denotes a diffuse reflection layer, and 101 to 104 denote projection images of the projectors 41 to 44 in FIG. 4, respectively. Projector 4
The projected light rays from 1 to 44 are displayed on the diffuse reflection layer 6 as a linear image as shown in FIG. By displaying the image on the line directly from behind the lenticular plate 7 on a flat panel display or a projection type display, a similar three-dimensional display is possible. Light rays diffused from the linear image follow a path as shown in FIG. 7 due to the lens effect of the lenticular plate 7.

FIG. 7 is a sectional view of the diffuse reflection layer 6, the lenticular plate 7, and the observer 8 as viewed from above. In FIG. 7, light rays emitted from the image 101 projected from the projector 41 reach the range of the observation area P. Images 102-104
Similarly, each ray of light reaching each observation area of Q, R, and S. Therefore, if the eyes of the observer 8 are in different regions, the parallax images are incident on both eyes, and a three-dimensional effect is felt. It is known from the above-mentioned literature and the like that a more natural three-dimensional image can be obtained by arranging a large number of projectors at a pitch finer than the distance between the eyes.

When many parallax images are displayed, if the resolution of the projector is the same, the resolution of the image deteriorates in inverse proportion to the number of parallax images. If the resolution of the two-dimensional image is degraded, the sampling effect (see the document "Okoshi" 3D image engineering ", 19
72 years), the resolution in the depth direction also deteriorates. Therefore, in order to display a high-quality stereoscopic image, a high-resolution display device that does not deteriorate the resolution while increasing the number of parallax images is required.

As such a high-resolution display device, a display device of a superposition projection system as shown in FIG. 8 has been announced. In FIG. 8, 41 and 42 are projectors, 5 is a half mirror, and 6 is a screen. FIG. 9 shows two display pixels (a, c and b, d) of the pixels 131 and 132 of each of the projectors 41 and 42 and how they are superimposed on each other. In the active matrix liquid crystal panel, as shown in FIG. 9, since the non-display portions 131a and 132a exist in the pixels due to the wiring area, the display pixels (a, c and b, d) are arranged discretely. I have. The superimposition projection method utilizes this fact to project the display pixel b of the pixel 132 on the non-display portion 131a of the pixel 131 (see the superimposed pixel 133 in FIG. 9), for example.
The resolution has been improved. By using the display device of the superimposition projection system with improved resolution in this way, many line images corresponding to a parallax image can be displayed within one lens pitch of the lenticular plate.

[0008]

However, in the above-described superposition projection method, it is difficult to adjust the position between the projectors, that is, to adjust the convergence, and the interval between superimposed pixels may be slightly shifted. FIG. 10 is a diagram illustrating a case where the overlap pixel interval is shifted. In FIG. 10, a set of images 101 and 103 and a set of images 102 and 104 are images projected from the same projector. That is, although the relationship between the images 101 and 103 and the relationship between the images 102 and 104 do not change, the images 101 and 10 forming one binocular parallax image are not changed.
The image 103 which forms the relationship of 2 and the other one binocular parallax image
And 104, the relative positions are shifted. In this case, the light beams emitted from the respective images reach the observation regions P, Q, R and S as shown in FIG. 9, but the regions Q and R and R and S
If the observer 8 has an eye in the overlapped area, a binocular parallax image with a correct binocular distance cannot be observed, and normal stereoscopic vision cannot be performed. This is because the parallax images incident on both eyes of the observer 8 at the observation position are projected from different projectors, and on the assumption that the image data and the optical characteristics of the lenticular plate 7 are determined. Because it is.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to avoid the influence of a slight positional shift between projectors, which is related to a case where a plurality of projectors are combined for projection. It is an object of the present invention to provide a projection type three-dimensional display device which can perform the following.

[0010]

In order to achieve the above object, the present invention provides a projector having a plurality of projectors, a screen, and a lenticular plate. Project a plurality of parallax images within one lens pitch of the lenticular plate so that discrete pixels are interpolated from each other, and correspond to the plurality of parallax images at an observation position through the lenticular plate. In a projection type stereoscopic display device that obtains stereoscopic vision, means for synthesizing an image so that each set of the parallax images incident on both eyes at the observation position are projected from the same one projector are provided, Each of the projectors is configured to project the plurality of parallax images on the screen in correspondence with the set of parallax images.

[0011]

In the projection type stereoscopic display apparatus of the present invention, the projector is adapted to the binocular parallax image by synthesizing images, and one binocular parallax incident on the binocular at the observation position when performing stereoscopic display by superposition projection. A set of images is an image from the same projector. Thereby, even if a slight deviation occurs between the pairs of images of the different binocular parallax images, the positional deviation does not appear between the images of the binocular intervals forming one binocular parallax image. I do. As described above, the binocular parallax images are always displayed at correct intervals, and a stereoscopic display without image quality deterioration is realized.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, 1 is a three-dimensional object, 21 to 24 are camera arrays, 3 is an image synthesizing device that synthesizes parallax images captured by the camera arrays 21 to 24, 41 and 42 are projectors as examples of projectors, and 5 is A half mirror, 6 is a transmissive diffusion screen, 7 is a lenticular plate, and 8 is both eyes of an observer. In the present embodiment, a case where parallax images from four directions are displayed will be described as an example.

The camera rows 21 to 24 are arranged at equal intervals so that the interval between the cameras is about 1/2 of the interval between both eyes of the observer. The parallax images of the three-dimensional object 1 captured by the camera rows 21 to 24 are combined by the image combining device 3 as image data as shown in FIG. That is, the image 121 of the camera 21 and the image 123 of the camera 23
Are synthesized alternately for each vertical line of the image 141 of the projector 41. Image 122 of camera 22 and camera 24
Similarly, the image 124 of the projector 42 is
42. By doing this,
A set of parallax images taken from the distance between the eyes, that is, the camera 2
A set of the image 121 of the camera 1 and the image 123 of the camera 23 is projected from the same
The set of 2 and the image 124 of the camera 24 is projected from the same projector 42. That is, the projectors 41 and 42 are used in correspondence with the binocular parallax image.

The images 141 and 142 shown in FIG. 2 projected by the two projectors 41 and 42 are superimposed and synthesized on an optical means for superimposing and synthesizing on a screen 6, here, a half mirror 5 which is one example thereof. Then, the transparent diffusing screen 6 is provided with approximately one of the lenticular plates 7.
A line image as shown in FIG. 3 is formed within the lens pitch. FIG. 3 is a cross-sectional view of the screen 6 and the lenticular plate 7 as viewed from above. In FIG. 3, 91 to 94
Are images of the cameras 21 to 24 in the same order. The diffused light from the line image follows a path as shown in FIG. 3A by the lens action of the lenticular plate 7 and enters both eyes of the observer 8 at the observation position. That is, in the observation region P, a parallax image 91 projected from the projector 41 enters the left eye, in the observation region R, 93 enters the right eye, and in the observation region Q, a parallax image 92 projected from the projector 42 appears. 94 enters the right eye in the observation region S to the left eye. The degree of diffusion of the light from the image by passing through the lenticular plate 7 can be controlled by changing the curvature, thickness, refractive index, and the like of the lenticular plate 7.

Now, as shown in FIG.
It is assumed that the relative positions of 1 and 42 are shifted for some reason. That is, the image 9 projected from the projector 41
A set of 1 and 93 and the image 9 projected from the projector 42
It is assumed that the position of the pair of 2 and image 94 has shifted. Even in this case, although the positional relationship between the observation regions P and Q and the positional relationship between R and S slightly change, normal binocular parallax images are still correctly incident on both eyes, so that normal stereoscopic vision is possible. As described above, in the present embodiment, even if the positional relationship between the projectors is slightly changed, the distance between the eyes is always preserved, and normal stereoscopic vision is possible.

In this embodiment, two projectors are described as being superimposed. However, if the horizontal aperture ratio of the liquid crystal pixels is low, a larger number of superimpositions is possible. It is easily inferred that the configuration can be adopted. Further, when performing this superimposition, it is not limited to using the superimposition synthesizing means such as the half mirror shown in the embodiment, and it is a matter of course that another optical system may be used or the superimposition may be performed directly on the screen. It is. As described above, the present invention can be applied variously according to the gist and can take various embodiments.

[0018]

As described above, in the projection type stereoscopic display device of the present invention, the parallax images incident on both eyes at the observation position are configured so as to be projected from the same projector. However, it is possible to avoid the influence of a slight positional shift between projectors, which is involved in a case where a plurality of projectors are combined for projection. Therefore, it is possible to provide a projection type stereoscopic display device capable of observing a stable stereoscopic image.

[Brief description of the drawings]

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

FIG. 2 is a view for explaining how to synthesize parallax images in the embodiment.

FIGS. 3A and 3B are diagrams illustrating directions of light rays diffused from a parallax image in the embodiment.

FIG. 4 is a diagram illustrating a conventional projection type multi-view stereoscopic display device.

FIG. 5 is a view for explaining the conventional projection type multi-view stereoscopic display device.

FIG. 6 is a diagram illustrating a parallax image formed on the back surface of a lenticular plate in the conventional projection type multi-view stereoscopic display device.

FIG. 7 shows the conventional projection type multi-view three-dimensional display device.
Diagram for explaining the direction of light rays diffused from a parallax image

FIG. 8 is a diagram illustrating a conventional superposition projection method.

FIG. 9 is a view for explaining the conventional superimposed projection method.

FIG. 10 is a view for explaining a case where a parallax image interval is out of order in the conventional superimposed projection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Three-dimensional object 21, 22, 23, 24 ... Camera 3 ... Image synthesis apparatus 41, 42, 43, 44 ... Projector 5 ... Half mirror 6 ... Transmissive diffusion screen 7 ... Lenticular plate 8 ... Observer (both eyes) ) 91, 92, 93, 94: Parallax image

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-20607 (JP, A) JP-A-1-107247 (JP, A) JP-A-1-1233591 (JP, A) JP-A-2- 87792 (JP, A) JP-A-3-65943 (JP, A) JP-A-3-97390 (JP, A) JP-A-4-159529 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) H04N 13/00-15/00

Claims (1)

(57) [Claims] 1. A lenticule having a plurality of projectors, a screen, and a lenticular plate, wherein discrete pixels from the plurality of projectors are interpolated on the screen arranged close to the lenticular plate. In a projection type stereoscopic display device for projecting a plurality of parallax images within one lens pitch of a circular plate and obtaining a stereoscopic view corresponding to the plurality of parallax images at an observation position through the lenticular plate, Providing means for synthesizing an image so that each set of the parallax images incident on the eye is projected from the same each one of the projectors, making each of the projectors correspond to the respective set of the parallax images A projection type stereoscopic display device, wherein the plurality of parallax images are projected on the screen.