JPH05336550A - Projection type stereoscopic display device - Google Patents

Abstract

PURPOSE:To evade the influence of a fine position shift between projectors which is caused frequently when plural projectors are combined to project images. CONSTITUTION:When a stereoscopic display is made by superimposition projection on a screen 6 by projectors 41 and 42, parallax images of respective camera arrays 21-24 as to a three-dimensional body 1 are put together and an image from the same projector 41 (or 42) is used as one pair of both-eye parallax images made incident on both the eyes of an observer 8 through a lenticular plate 7. Consequently, no position shift is made between images at the both-eye interval of one both-eye parallax image. Thus, both-eye parallax images are displayed at the correct interval at all times to make the stereoscopic display without the influence of the position shift between the projectors 41 and 42 such as deterioration in picture quality.

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 device using a lenticular plate as a screen.

[0002]

2. Description of the Related Art Conventionally, as a stereoscopic display device of this type, for example, a technical report of the Television Society (VVI-63-
3, "Shown in 1960", "Multi-view color stereoscopic television" and Technical Report of the Television Society of Japan (VV
An apparatus as disclosed in "Experiment of multi-view three-dimensional image viewing zone expanding optical system" described in I-88-42, 1988) is known. Such a three-dimensional display device is a stereoscopic display device that utilizes depth perception based on left-right binocular parallax, and its principle is described in, for example, the publication "Depth perception and multi-eye display," Optical ", Vol. 1
7, No. 7, 1988 ".

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

FIG. 6 shows the lenticular screen 9 described above.
The figure which expanded the lenticular plate and diffuse reflection layer which comprise is shown. In FIG. 6, 7 is a lenticular plate, 6 is a diffuse reflection layer, and 101 to 104 are projection images of the projectors 41 to 44 of 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. Similar stereoscopic display can be achieved by displaying the image on this line directly from the rear of the lenticular plate 7 on a flat panel display or a projection display. The light rays diffused from this linear image follow the 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 seen from above. In FIG. 7, the light beam emitted from the image 101 projected from the projector 41 reaches the range of the observation region P. Images 102-104
Similarly, each of the light rays emitted from the light source reaches each of the observation regions of Q, R, and S. Therefore, if both eyes of the observer 8 are in different regions, the parallax image is incident on both eyes and a stereoscopic effect is felt. It is known from the above-mentioned documents and the like that a more natural three-dimensional image can be obtained by arranging a large number of projectors at a pitch smaller than the distance between the eyes.

When many parallax images are displayed, if the resolutions of the projectors are the same, the image resolution deteriorates in inverse proportion to the number of parallax images. If the resolution of the two-dimensional image deteriorates, the sampling effect (see “Okoshi“ 3D Image Engineering ”, 19
1972 ”), the resolution in the depth direction also deteriorates. Therefore, in order to display a high-quality stereoscopic image, a high-resolution display device that increases the number of parallax images and does not deteriorate the resolution is required.

As such a high-resolution display device, a superimposing 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 are present in the pixels due to the wiring area, the display pixels (a, c and b, d) are discretely arranged. There is. The superposition projection method uses this, for example, so that the non-display portion 131a of the pixel 131 displays the display pixel b of the pixel 132 (see the superposed pixel 133 in FIG. 9).
The resolution is improved. By using the superimposing projection type display device with improved resolution as described above, it is possible to display line images corresponding to many parallax images within one lens pitch of the lenticular plate.

[0008]

However, in the above-mentioned superposition projection method, it is difficult to perform alignment between the projectors, that is, so-called convergence adjustment, and there is a possibility that the interval between the superposed pixels may be slightly deviated. FIG. 10 is a diagram illustrating a case where the superposed 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 that form one binocular parallax image.
And the image 103 that constitutes the other one binocular parallax image
The relative positions of the relations of 104 and 104 are deviated. In this case, the rays emitted from each image reach the observation areas of P, Q, R, and S as shown in FIG. 9, but the areas of Q and R and the areas of R and S.
When the observer's eyes are in this overlapped area, the binocular parallax image with the 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 premise of that, the image data and the optical characteristics of the lenticular plate 7 are determined. This is because

The present invention has been made in order to solve the above problems, and an object thereof is to avoid the influence of a slight positional deviation between projectors even when a plurality of projectors are combined and projected. It is to provide a projection type stereoscopic display device capable of performing the above.

[0010]

In order to achieve the above object, the present invention has a plurality of projectors, a screen, and a lenticular plate, and the plurality of projectors are provided on the screen arranged in the vicinity of the lenticular plate. Projectors project a plurality of parallax images within one lens pitch of the lenticular plate so that discrete pixels are interpolated with each other, and correspond to the plurality of parallax images at the observation position through the lenticular plate. In a projection type stereoscopic display device for obtaining a stereoscopic view, means for synthesizing images is provided so that each pair of the parallax images incident on both eyes at the observation position are projected from the same one projector. The projectors are configured to project the plurality of parallax images on the screen in association with the set of parallax images.

[0011]

In the projection type stereoscopic display device of the present invention, one binocular parallax incident on both eyes at the observation position when stereoscopic display is performed by superimposing projections by making the projector correspond to the binocular parallax image by combining images. Let a set of images be images from the same projector. As a result, even if there is a slight deviation in the distance between the sets of images of different binocular parallax images, the positional deviation does not occur between the images of the binocular distance forming one binocular parallax image. To do. In this way, the binocular parallax images are always displayed at the correct intervals to realize stereoscopic display without image quality deterioration.

[0012]

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

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, 1 is a three-dimensional object, 21 to 24 are camera rows, 3 is an image synthesizing device for synthesizing parallax images captured by the camera rows 21 to 24, 41 and 42 are projectors which are examples of projectors, and 5 are A half mirror, 6 is a transparent diffusion screen, 7 is a lenticular plate, and 8 is both eyes of an observer. In this 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 such that the distance between the cameras is about 1/2 of the distance between the 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 alternately combined 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
42. By doing this,
A set of parallax images taken from the distance between the eyes, that is, the camera 2
The image 121 of the camera 22 and the image 123 of the camera 23 are projected from the same projector 41.
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 of FIG. 2 projected by the two projectors 41 and 42 are superimposed and synthesized by an optical means for superimposing and synthesizing on the screen 6, here, a half mirror 5 which is one example thereof. Then, the transparent diffusing screen 6 is provided with approximately 1 of the lenticular plate 7.
An image is formed in the lens pitch as a line image as shown in FIG. 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 from cameras 21 to 24 in the same order. The diffused light from this line image follows the 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, the 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, the parallax image 92 projected from the projector 42. In the observation area S, 94 is incident on the right eye of the left eye. The degree of diffusivity of the light rays from the image as it passes through the lenticular plate 7 can be controlled by changing the curvature, thickness, refractive index, etc. of the lenticular plate 7.

Now, as shown in FIG. 3B, the projector 4
It is assumed that the relative positions of 1 and 42 are displaced for some reason. That is, the image 9 projected from the projector 41
The set of 1 and 93 and the image 9 projected from the projector 42
It is assumed that the position of the set of 2 and the image 94 is displaced. Even in this case, although the positional relationship between the observation areas P and Q and the positional relationship between R and S are slightly changed, since the binocular parallax image still correctly enters both eyes, normal stereoscopic vision is possible. As described above, in the present embodiment, the binocular distance is always preserved even if the positional relationship between the projectors slightly changes, and normal stereoscopic viewing is possible.

In the present embodiment, it has been described that two projectors are superposed, but if the lateral aperture ratio of the liquid crystal pixel is low, a larger number of superimpositions are possible and the same as in the present embodiment. It can be easily inferred that it can be configured. Further, when this superimposition is performed, it is not limited to using the superimposing / combining means such as the half mirror shown in the embodiment, and it goes without saying that other optical systems may be used or the superimposing may be performed directly on the screen. Is. As described above, the present invention can be variously applied and various embodiments can be taken in line with the gist thereof.

[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 projected from the same projector. Although it is possible to project by combining a plurality of projectors, it is possible to avoid the influence of a slight positional deviation between the projectors. Therefore, it is possible to provide a projection-type stereoscopic display device capable of observing a stable stereoscopic image.

[Brief description of drawings]

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

FIG. 2 is a diagram illustrating how parallax images are combined in the above embodiment.

3A and 3B are views for explaining directions of light rays diffused from a parallax image in the above embodiment.

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

FIG. 5 is a view for explaining the above-mentioned 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 is a perspective view showing the conventional projection-type multi-view stereoscopic display device.
The figure explaining the direction of the light ray diffused from a parallax image.

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

FIG. 9 is a diagram for explaining the above-mentioned conventional superimposed projection method.

FIG. 10 is a diagram illustrating a case where the parallax image interval is wrong in the above-described conventional superimposing projection method.

[Explanation of symbols]

 1 ... Three-dimensional object 21, 22, 23, 24 ... Camera 3 ... Image synthesizer 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

Claims (1)

[Claims] 1. A lenticular having a plurality of projectors, a screen and a lenticular plate, wherein discrete pixels from the plurality of projectors are interpolated to each other on the screen arranged close to the lenticular plate. In a projection type stereoscopic display device, which projects a plurality of parallax images within one lens pitch of a curular plate and obtains a stereoscopic view corresponding to the plurality of parallax images at an observation position through the lenticular plate, A means for synthesizing images is provided so that each pair of the parallax images incident on the eye is projected from the same one projector, and each projector is associated with the pair of parallax images. A projection type stereoscopic display device, characterized in that the plurality of parallax images are projected on the screen.