JPH09179090A - Projection type stereoscopic video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display stereoscopic video of high spatial resolution by a small number of projectors. SOLUTION: This device consists of a projector 1 which projects left-eye video and right-eye video differing in viewpoint alternately in field cycles and a screen 2 on which the video prcjected by the projector 1 is imaged, and the screen 2 consists of decentralized type liquid crystal films 3 which can switch the diffused part and transmitted part of light and a lenticular lens plate 4 which splits the light of video imaged on the film 3 into a left and a right part. When the projector 1 projects the right-eye video, the decentralized type liquid crystal films 3 form diffused parts in 2nd areas 3b and the lenticular lens plate 4 split right-eye pixels R imaged at the diffused parts toward the right eye; when the projector 1 projects the left-eye video, the decentralized liquid crystal films 3 form the diffused parts in 1st areas 3a and the lenticular lens plate 4 split pixels L for the left eye imaged at the diffused parts toward the left eye.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type three-dimensional image display device which allows an observer to view a three-dimensional image projected by a projector or the like without using special glasses.

[0002]

2. Description of the Related Art Conventionally, as a projection type stereoscopic image display device which does not use special glasses of this kind, a system using a single lenticular screen in which a lenticular lens is arranged only on the exit side of a diffusion plate, and an incidence of the diffusion plate. There is a system using a double lenticular screen in which a lenticular lens is arranged on each of the light emitting side and the light emitting side.

In the former method using a single lenticular screen, a projector projects a vertically striped image for the left eye and an image for the vertical striped right eye so as to form images alternately on a diffuser plate. This is a method in which the left and right images thus formed are separately condensed by the action of a lenticular lens arranged on the exit side so that they are separately incident on the left and right eyes of the observer.

In the latter method using a double lenticular screen, the first projector projects a left-eye image, the second projector projects a right-eye image, and the projected left and right images are projected. By the action of the lenticular lens on the incident side, the vertical stripe-shaped image for the left eye and the vertical stripe-shaped image for the right eye are separated so as to form images alternately on the diffuser plate. This is a method of separately collecting and condensing the image by the action of the lenticular lens on the exit side so as to be separately incident on the left and right eyes of the observer.

However, in the former method using a single lenticular screen, in the case of the twin-lens type, pixels for the left eye (image constituent elements) and pixels for the right eye (image constituent elements) are associated with one lenticular lens. Since the images of and are formed and the formed image is separated into left and right, there is a problem that the horizontal resolution is reduced to 1/2. Further, it is difficult to align the image formed on the diffusion plate with the lenticular lens on the emission side.

Further, in the latter method using the double lenticular screen, it is easy to align the image formed on the diffusion plate with the lenticular lens on the emission side, but it is necessary to use two projectors. There's a problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is possible to display a stereoscopic image having a good horizontal resolution with a small number of projectors, and to project from a projector. It is an object of the present invention to provide a projection-type stereoscopic image display device in which it is easy to align the light of an image with a screen on which the light of the image is formed.

[0008]

A projection type stereoscopic image display apparatus of the present invention comprises a projection means for projecting a plurality of videos with different viewpoints in a time division manner, and a screen for forming an image projected by the projection means. The screen is composed of an image forming unit capable of changing the position of a diffusion unit on which light is formed, and a spectroscopic unit separating left and right light of an image formed on the image forming unit. When the projection means projects the image of the first viewpoint, the image forming means forms a diffusing portion in the first area, and the light of the image of the first viewpoint imaged on the diffusing portion is formed. When the projection unit separates in the first direction and the projection unit projects the image of the second viewpoint, the image forming unit forms a diffusion unit in the second region, and the diffusion unit forms an image on the diffusion unit. The light of the image from the two viewpoints is separated in the second direction by the spectroscopic unit. To.

According to such a configuration, at a certain point of time, only the image of the first viewpoint is formed on the screen,
The image of the first viewpoint formed on this screen is incident on one eye of the observer, and at the next time point, only the second image is formed on the screen, and the second image formed on this screen. Image enters the other eye of the observer. For this reason,
The pixel information amount of the image incident on the observer's eyes is substantially equal to the pixel information amount of the image projected from the projector at that time point, and the spatial resolution of the stereoscopic image does not decrease.

Further, since the position where the light of the image of the first and second viewpoints is formed is determined by the position of the first and second regions, the position of the light of the image projected from the projection means is There is no problem if it deviates a little.

Further, the first image projected by the projection means,
The first and second regions are set so that the light of all the pixels of the second image is imaged, and the light of the pixels imaged in the first and second regions are all in the first and second directions. By positioning the first and second regions and the spectroscopic means so that the light is spectrally separated, the above-described action of preventing the deterioration of the spatial resolution is ensured.

Further, by forming the image forming means by a dispersion type liquid crystal film, the positions of the first and second regions can be formed freely and accurately by patterning the electrodes, and the position of the diffusion portion can be electrically changed. High-speed and accurate movement control is possible.

Further, the first image projected by the projection means,
By making the second image the image of the same viewpoint and using the first and second regions of the image forming means as the diffusion portions, the light of the same image is simultaneously directed in the first direction and the second direction. For,
The observer recognizes a two-dimensional image by receiving exactly the same image information on the left and right eyes.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a projection type stereoscopic image display device according to an embodiment of the present invention.

In the figure, 1 is a projector (projection means) for projecting light having stereoscopic image information, and 2 is a screen portion on which the light of the image projected by the projector 1 is formed.

The screen portion 2 is composed of a dispersion type liquid crystal film 3 (image forming means) and a lenticular lens plate 4 (spectral means) arranged on the exit side of the dispersion type liquid crystal film 3. The dispersion type liquid crystal film 3 is capable of partially switching between a diffusing part for forming an image of light and a transmitting part for transmitting the light without forming an image. In the present embodiment, as shown in FIG. 2, the dispersion type liquid crystal film 3 has a vertical stripe pattern so that the diffusion section (hatched section) and the transmission section (non-hatched section) can be switched for each vertical stripe pattern. The first region 3a and the second region 3b are alternately positioned, and the regions of the diffusion portion and the transmission portion are inverted as in the relationship between the state of (a) and the state of (b) of FIG. It can be done.

Further, the lens pitch of the lenticular lens plate 4 is such that the first region 3a and the second region 3b are positioned so that one lens has one set of diffusion part and transmission part.

Therefore, in the first state, as shown in FIG. 2 (a), when viewed from the projector 1 side, the first region 3a located on the left side in one lens 4a is the transmissive portion and the first region 3a is on the right side. The located second area 3b serves as a diffusion portion, and in the second state, as shown in FIG. 2B, the first area 3a located on the left side in one lens 4a when viewed from the projector 1 side. Is the diffusion part, and the second region 3b located on the right side is the transmission part. Then, the first state and the second state can be electrically switched.

In the image projected from the projector 1, a left-eye image and a right-eye image, which form a stereoscopic image by binocular parallax, are alternately switched in a field cycle. Further, the projector 1 projects in the horizontal direction such that the amount of light of one pixel corresponds to one lens 4a of the lenticular lens plate 4. The light amount for the one pixel may be slightly larger than that for the one pixel. Further, as a display device for displaying an image projected from the projector, a CRT or LC capable of high-speed display is used.
D, DMD (digital micromirror device), etc. are used.

Next, the operation of the projection type stereoscopic image display device of the above embodiment will be described. First, in the odd field among the odd and even fields that form one frame of the image, the image for the right eye is projected from the projector 1. At this time, the dispersion-type liquid crystal film 3 is in the first state shown in FIG. 2A, and as shown in FIG. 3, the pixel R for the right eye forms an image in the second region 3b serving as the diffusion part. To do. Also,
The light of the image for the right eye is transmitted through the first region 3a, which serves as a transmission portion, without forming an image.

The light from the pixel R for the right eye, which is imaged in the second region 3b, is incident on the right eye 5R of the observer at the proper viewing position by the lenticular lens plate 4. Next, in the even field out of the odd and even fields that make up the video of one frame, the image for the left eye is projected from the projector 1. At this time, the dispersion type liquid crystal film 3 is shown in FIG.
In the second state as shown in FIG. 4, the pixel L for the left eye is imaged in the first region 3a serving as the diffusion portion, as shown in FIG.
Further, the light of the image for the left eye is transmitted without forming an image in the second region 3b serving as a transmission part.

The light from the pixel L for the left eye imaged in the first area 3a is incident on the left eye 5L of the observer at the proper viewing position by the lenticular lens plate 4. Therefore, the observer at the proper viewing position recognizes the image for the right eye formed on the second region 3b of the dispersion type liquid crystal film 3 in the odd field with the right eye 5R, and in the even field the dispersion type liquid crystal film 3 The image for the left eye formed in the first region 3a of the left eye 5L
You can see the stereoscopic image.

In such a projection type stereoscopic image display device,
The display panel of the projector 1 is
All the pixels are pixels for the right eye, and in the even field, all pixels are pixels for the left eye, and the light of the pixels for the right eye and the left eye is all in the second area or the first area.
Because of the imaging in the area, the observer will
Recognize the image for the right eye displayed on all pixels of the display panel,
In the even field, the image for the left eye displayed on all pixels of the display panel is recognized. That is, the observer can view a stereoscopic image having the same spatial resolution as the display panel.

Further, in this projection type stereoscopic image display device,
Even if the light positions of the right-eye and left-eye images projected from the projector 1 are slightly displaced, the right-eye image light is imaged in the second region 3b, and the left-eye image is not light. Since the image is formed in the first region 3a, each imaged pixel is separated into right and left, respectively, so that the observer can recognize a good stereoscopic image.

Further, in the projection type stereoscopic image display device of the above-described embodiment, as shown in FIG. 5, the first and second regions 3a and 3b of the dispersion type liquid crystal film 3 are in a diffused state, and the projector 1 By displaying a more normal plane image, the light of each pixel projected from the projector 1 is imaged in both the first area 3a and the second area 3b, and the light from the imaged pixel is observed. The left and right eyes 5L and 5R of the person respectively enter, and the left and right eyes 5L and 5R recognize the same image, so that the observer views a normal two-dimensional image.

FIG. 5 is a diagram showing a case where a normal plane image projected from the projector 1 is an image for the right eye, and the dispersed liquid crystal film 3 has pixels R1, R for the right eye.
Two R2, R3, R4, and R5 are imaged, and right and left eyes 5L and 5R of the observer have pixels R1 and R2 for the right eye, respectively.
Image light composed of R3, R4, and R5 similarly enters.

In the above embodiment, the light of the image formed on the diffusing portion of the dispersion type liquid crystal film is dispersed by the lenticular lens plate, but may be dispersed by the parallax barrier plate.

Further, in the above-mentioned embodiment, the binocular stereoscopic image has been described, but the same applies to a multi-lens system such as a four-eye system or an eight-eye system. That is, in the case of an n-eye type stereoscopic image, images from n viewpoints are time-divisionally projected from the projector,
Further, the dispersion type liquid crystal film is divided and configured so that n regions correspond to one lenticular lens, and the n number of regions are synchronized with the image projected from the projector.
It suffices to select one in order so that one of them becomes a diffusion part.

[0029]

According to the present invention, a high-definition stereoscopic image having a high spatial resolution can be displayed with a small number of projection means, and the positional relationship between the projection means and the screen can be easily adjusted. It is possible to provide a projection-type three-dimensional image display device that can be used.

Further, according to the present invention, in addition to the above effects, it is possible to provide a projection type stereoscopic image display device capable of easily switching and displaying a two-dimensional image having the same spatial resolution.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a projection type stereoscopic image display device of the present invention.

FIG. 2 is a diagram showing a correspondence relationship between a dispersion type liquid crystal film and a lenticular lens in the projection type stereoscopic image display device of the present invention.

FIG. 3 is a plan view showing a state in which an image for the right eye is displayed on the projection type stereoscopic image display device of the present invention.

FIG. 4 is a plan view showing a state in which a left-eye image is displayed on the projection stereoscopic image display device of the present invention.

FIG. 5 is a plan view showing a state in which a two-dimensional image is displayed on the projection type three-dimensional image display device of the present invention.

[Explanation of symbols]

 1 projector (projection means) 2 screen 3 dispersion type liquid crystal film (imaging means) 4 lenticular lens plate (spectral means) 5L left eye 5R right eye L left eye pixel (image constituent element) R right eye pixel ( Image component)

Claims (4)

[Claims] 1. A projection means for projecting a plurality of images from different viewpoints in a time division manner, and a screen for forming an image of the image projected by the projection means, wherein the screen is a diffusing portion on which light is formed. What is claimed is: 1. A projection type stereoscopic image display device comprising: an image forming unit whose position can be changed; and a spectroscopic unit that splits the light of an image formed on the image forming unit into left and right parts. When projecting an image from the viewpoint, the image forming unit forms a diffusion portion in the first region, and the light of the image from the first viewpoint imaged on the diffusion portion is separated in the first direction by the spectroscopic unit. When the projection means projects the image of the second viewpoint, the image forming means forms a diffusion part in the second area, and the light of the image of the second viewpoint imaged on the diffusion part is dispersed into the spectrum. A projection-type three-dimensional image display device, characterized in that it is separated in a second direction by a section. 2. A first and a second projected by the projection means.
The first and second regions are set so that the light of all the pixels of the image is imaged, and the light of the image constituent elements imaged in the first and second regions are all the first and second regions. The stereoscopic image display apparatus according to claim 1, wherein the first and second regions and the spectroscopic unit are positioned so as to be spectrally dispersed in the direction. 3. The projection type stereoscopic image display device according to claim 1, wherein the image forming means is composed of a dispersion type liquid crystal film. 4. A first and a second projected by the projection means.
2. The projection type stereoscopic image display apparatus according to claim 1, wherein the image of the same point of view is used as the image of the same viewpoint, and the first and second regions of the image forming means are used as the diffusion portions to display the two-dimensional image. .