JPH08160355A - Stereoscopic picture display device - Google Patents

Abstract

PURPOSE: To accomplish a wall type stereoscopic television by a stereoscopic image display which can be observed by many people at the same time without using special spectacles. CONSTITUTION: A convex lens array L is arranged so as to output a stereoscopic picture, and behind the array L, a monochromatic liquid crystal television D is arranged at, or near a position where an observer O's face image is substantially formed, a television camera G is arranged near the large-sized convex lens L so as to input the observer O's picture, besides, a color liquid crystal panel J capable of displaying the stereoscopic image to be observed by the observer O is installed between the observer O and the convex lens array L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device which does not require the use of glasses or the like.

[0002]

2. Description of the Related Art Conventionally, the applicant of the present application has already proposed in Japanese Patent Application No. 4-303116 as a stereo image display device capable of simultaneous observation by a large number of people without the use of eyeglasses. The principle of this device will be described as follows. In order to enable simultaneous observation of a pair of stereo images by multiple observers, a pair of color liquid crystal plates that can display stereo images in a time-division manner and the images are correctly and selectively selected by the left and right eyes. A time-division head-tracking type stereoscopic image display device comprising a backlight composed of a large convex lens capable of sending and a black-and-white television capable of displaying the observer image. Simultaneous observation of the number of people is possible. However, since the distance between the large convex lens and the black-and-white television becomes large, the device has a drawback that it becomes large in the depth direction.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and relates to a stereoscopic image display device for performing stereoscopic stereoscopic image display in a time-divisional or time-parallel manner without special glasses.

[0004]

In view of the above, according to the present invention, firstly, a convex lens array is provided for outputting a stereoscopic image, and behind the convex lens array, a position where a group of facial images of an observer is substantially formed or in the vicinity thereof. , The left and right eyes of the observer are each provided with a backlight light source capable of outputting an image so as to distribute correct stereo images in a time division manner, and the observer should observe between the observer and the convex lens array. By providing a stereoscopic image display device in which a transparent electro-optical spatial modulation element group capable of displaying a stereo image in a time division manner is arranged. Second, a convex lens array is arranged to output a stereoscopic image, and a correct stereo image is displayed on the left and right eyes of the observer at or near the position where the observer's facial image is formed substantially behind it. In order to distribute in parallel, backlight light sources for the left and right eyes are provided with a backlight light source capable of outputting two images whose polarization axes are at right angles, and further between the observer and the convex lens array, A group of transparent electro-optical spatial modulators capable of displaying stereo images to be observed in parallel in time and capable of selectively using either one of polarized lights emitted from the two stereo images as a backlight. By arranging the stereoscopic image display device. Third, between the backlight shown in claims 1 and 2 and a group of transparent electro-optical spatial modulators capable of displaying the stereo image,
An electro-optical spatial modulation element that synchronizes with the time division and can rotate the polarization axis of transmitted light by 90 degrees is provided, and further, the backlight according to claim 1 and the stereo image display according to claim 2 are possible. By providing a stereoscopic image display device in combination with another electro-optical spatial modulation element. Fourthly, polarization of transmitted light is synchronized with the time division between the backlight shown in claims 1 and 2 and a transparent electro-optical spatial modulation element group capable of displaying the stereo image. An electro-optical spatial modulation element whose axis is rotatable by 90 degrees is provided, and the backlight according to claim 2 and the electro-optical spatial modulation element capable of displaying a stereo image according to claim 1 are provided. This is due to the combination of stereoscopic image display devices. Fifthly, a television camera capable of continuously photographing the image on the observer side is mounted in the vicinity of the convex lens array to provide the stereoscopic image display device according to any one of claims 1 to 4. Sixth, the stereoscopic image display apparatus according to claim 5, wherein the stereoscopic image is properly illuminated to the left and right eyes of the observer by selectively illuminating the observer. . Seventh, it is obtained from the television camera according to claim 5 so as to input a binary image of the face of the observer when the image on the side of the observer is input to the backlight light source according to any one of the first to fourth aspects. 7. The stereoscopic image display device according to claim 5, wherein the observer image is subjected to image processing. Eighth, the stereoscopic image display device according to claim 1, wherein the convex lens array is a Fresnel convex lens array. Ninth, the convex lens array is a holographic convex lens array or a diffraction grating lens array to provide a stereoscopic image display device according to claim 1. Tenth, the observer image group output by the backlight light source surface photographed by the television camera and the observer image group imaged by the convex lens array on the backlight light source surface are geometric. Therefore, the above-mentioned object is achieved by providing the stereoscopic image display device according to any one of claims 5 to 9 in which the taking lens of the television camera according to claim 5 has an array structure.

[0005]

According to the present invention, the binary image of the one-sided face image on the side of the stereoscopic viewer is used so as to act as a backlight for each polarized stereo image whose polarization axis is perpendicular to the time-division stereo image display in synchronization with or in time parallel with. Is input to a backlight light source pre-arranged on the focal plane so as to geometrically match the image group of the observer focused by the provided convex lens array, thereby performing time division or time division. The respective stereo images are distributed in parallel to the left and right eyes in parallel, and the focal length of the convex lens array is smaller than that of a large convex lens having the same area, so the thickness of the apparatus is also reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the gist of a stereoscopic image display device according to claim 1 of the present invention, a first embodiment will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a stereoscopic image display device 1a, and FIG. 2 is a diagram showing a main part of an optical path in which the stereoscopic image display device is viewed from the side, and a convex lens array L is used to output a stereoscopic image. Is arranged,
As a backlight light source capable of image output for time-divisionally distributing correct stereo images to the left and right eyes of the observer at or near the position where the face image of the observer is substantially formed behind it, as will be described later. Since the polarizing plate as the polarizer of the color liquid crystal television can be shared with the polarizing plate as the polarizer of the black and white liquid crystal television D which will be described later, the black and white liquid crystal television D having a high image rewriting speed without the polarizing plate on the surface is provided. , A transparent electro-optical spatial modulation element group capable of time-divisionally displaying a stereo image to be observed by the observer between the observer O and the convex lens array L, and a color without a backlight Liquid crystal television J and its matrix circuit F
And the stereo video signal N output from the video tape recorder A is input to the matrix circuit F.
At that time, a stereo sync signal S is taken out from the stereo video signal N outputted from the video tape recorder A from the circuit C, and the convex lens array L capable of continuously photographing the image on the side of the observer O while synchronizing with the sync signal S. In the binarization circuit B, the binarized image of either the left or right of the video signal M on the observer O side obtained by the infrared television camera G equipped with an array-shaped taking lens mounted near The half-valued binary image of the observer O and the inverted image signal K that are combined are combined with the image of the observer O side focused by the lens array L on the black and white liquid crystal television D and the geometry. The light source H is alternately illuminated in a time-division manner so as to coincide with each other, and the light source H is infrared-illuminated to the observer O from one of the left and right directions of the surface of the convex lens array L, and the image thereof is obtained by the infrared television camera G.
The half plane image group of the observer O can be obtained as described above by photographing at. Therefore, the plurality of observers O who can observe the light source H can observe the stereo image as a stereoscopic image.

Next, in order to further clarify the gist of the stereoscopic image display device according to claim 2 of the present invention, a second embodiment will be described with reference to the drawings. 3 is a schematic configuration diagram showing a main part of the stereoscopic image display device 1b, and FIG. 4 is an optical path diagram showing a main part of an optical path when the stereoscopic image display device is viewed from the side. A convex lens array L is arranged to output, and correct stereo images are distributed in parallel to the left and right eyes of the observer at or near the position where the face image of the observer is substantially formed behind it. As a backlight light source capable of outputting images as much as possible, a monochrome LCD TV D
The polarizing plate on the surface of the black and white liquid crystal television D is
A polarizing plate having polarization angles alternately orthogonal to each other corresponding to a horizontal or vertical position of pixels of the black and white liquid crystal television, or a crystal or liquid crystal having a polarization axis of transmitted light rotated by 90 degrees to one polarizing plate. The black and white liquid crystal television D
Every other row corresponding to the horizontal or vertical position of the pixel is used. Further, between the observer O and the convex lens array L, a stereo image to be observed by the observer O can be displayed in parallel in time, and each stereo image selectively selects either one of the orthogonal polarizations. A color liquid crystal television J without a backlight, which can be used as a backlight, and a matrix circuit F thereof are provided. Therefore, the polarizing plate on the backlight incident surface side of the color liquid crystal television J is a polarizing plate or a polarizing plate whose polarization azimuth angles are alternately orthogonal to each other corresponding to the horizontal or vertical position of the pixels of the color liquid crystal television. It is composed of crystals and liquid crystal films. The stereo video signal N output from the video tape recorder A is input to the matrix circuit F. At that time, the stereo video signal N is
Since the interlaced system includes the images for the right eye and the image for the left eye, the image for the right eye drives the pixels of the color liquid crystal television J at the position where the polarizing plate that can select the backlight light for the right eye is present. , The left-eye image displays a pixel of the color liquid crystal television J at a position where a polarizing plate that can select the left-eye backlight light exists, a pixel that displays the right-eye image, and a left-eye image. Since the polarization backlight lights input to the pixels have their polarization axes at right angles, + -electrode inversion drive is performed, and an array shape is mounted in the vicinity of the convex lens array L capable of continuously capturing images on the observer O side. The binarized image of either the left or right of the video signal M on the side of the observer O obtained by the infrared television camera G equipped with the taking lens of FIG. Binary image of half surface of O And its inverted image signal K to the black-and-white liquid crystal television D so as to geometrically match the image on the side of the observer O focused by the lens array L. By alternately inputting each column, irradiating the light source H with infrared light to the observer O from one of the left and right directions of the surface of the convex lens array L, and capturing the image with the infrared television camera G. As described above, the half-plane image group of the observer O is obtained. Therefore, the plurality of observers O who can observe the light source H can observe the stereo image as a stereoscopic image. When the black-and-white liquid crystal television D is an ordinary black-and-white liquid crystal television without a polarizing plate as an analyzer, either the left or right of the binarized image may be input to the black-and-white liquid crystal television.

The lens array L may be a Fresnel convex lens array, a holographic lens array, or a diffraction grating lens array, and the television camera G uses a half mirror or the like to form the convex lens array L.
May be disposed on the optical axis of the light source H, as long as the light source H has sensitivity to the visible light, infrared rays, and ultraviolet rays of the television camera G, and the position and the number of the light sources H are within the scope of the present invention. It is optional as long as it does not conflict, and it may be unnecessary when performing the image processing described later, and a system that can obtain the image of microwaves or ultrasonic waves instead of the camera G may be used. Further, in the present embodiment, the taking lens of the television camera G has an array shape, but the taking lens does not necessarily have to be an array shape when performing image processing described later. Further, when the TV camera G is an autofocus camera, the distance between the lens array L and the image output surface of the black-and-white liquid crystal TV D is linked to it so that the image of the observer O is connected to the image output surface of the black-and-white TV D. It may have a function of automatically adjusting so as to form an image, and in order to improve efficiency as a backlight, a large convex lens or Fresnel convex lens, a holographic lens, or Diffraction grating lenses may be arranged, and further, those in the form of an array may be arranged.

Further, it is not always necessary to use one of the black-and-white inverted images as the binary image input to the monochrome liquid crystal television D, and the left and right binary images of each observer function as a backlight in the monochrome liquid crystal television D. do it. Further, in order to obtain the binarized image, a plurality of the television cameras G may be used, or the image of the observer may be image-processed to obtain the binarized image.

Although a black and white liquid crystal television is used as a backlight light source in this embodiment, it is sufficient that a thin two-dimensional image output is possible and the emitted light contains at least the three primary colors. For example, a plasma display, a neon tube display, an individual light emitting element, a thin CRT, an array CRT, or the like. However, according to claim 2, the two-dimensional image output surface is polarized in stripes and alternately so as to display two binarized images in which the polarization axes are polarized at right angles for the left and right eyes in parallel in time. It is necessary to stick a polarizing plate made of a polarizer having an azimuth angle to the two-dimensional image output surface. However, in that case, the sticking shape of the polarizer on the polarizing plate is arbitrary within the range not deviating from the gist of claim 2, and the polarizing plate on the backlight incident surface side of the color liquid crystal television is also the same. Further, in the present embodiment based on claim 1, a black and white liquid crystal television without a polarizing plate on the surface was used as a backlight. However, when the polarizing plate is not removed, a polarizing plate on the backlight incident surface of the color liquid crystal television is used. The polarization azimuth and the polarization azimuth of the liquid crystal plate on the surface of the black-and-white liquid crystal television are matched, or the liquid crystal plate on the backlight incident surface of the color liquid crystal television is unnecessary. In the present embodiment based on claim 2, the stereo video is input from the video tape recorder in a time division manner, but a time-parallel stereo video signal composed of two video signals may be used.

Next, a stereoscopic image display device according to a third aspect of the present invention is, for example, as shown in FIG. 5, the backlight shown in the first and second aspects, and a transparent and electric device capable of displaying a stereo image. An electro-optical spatial modulation element E is provided between the optical spatial modulation element group, and the polarization axis of the transmitted light can be rotated by 90 degrees in synchronism with time division, and the electro-optical spatial modulation element E is further arranged. The backlight D and the electro-optical spatial modulation element J capable of displaying a stereo image according to claim 2 are combined.

Next, a stereoscopic image display device according to a fourth aspect of the present invention is, for example, as shown in FIG. 6, the backlight shown in the first and second aspects, and a transparent and electric device capable of displaying a stereo image. The electro-optical spatial modulation element E is provided between the optical spatial modulation element group and the optical axis modulation element E, which is capable of rotating the polarization axis of the transmitted light by 90 degrees in synchronism with time division. The backlight D and the electro-optical spatial modulation element J capable of displaying a stereo image according to claim 1 are combined.

Further, in the present embodiment based on claims 1 and 2, the video tape recorder is used as a device for generating a stereo image, but any device capable of generating a stereo image may be used.

Further, in the present embodiment, although it is used as a stereoscopic image display device which is one-way communication from a video tape recorder, it is used for a television, a home and an industrial stereoscopic image display device, a medical image stereoscopic image display device, The two-way communication may be used, for example, for multimedia, game consoles, videophones, virtual reality, or the like.

Furthermore, instead of the convex lens array arranged to distribute the backlight to the stereoscopic image observer used in this embodiment, a double fly eye lens as shown in FIGS. 7 and 8 is used. When the screen L1 is used, the image lens of the television camera for capturing the image of the observer need not be arrayed. In addition, the binarized image of the viewer displayed on the backlight light source does not need to be multiframe.

[0016]

Since the present invention is constituted as described above, the position of the observer is not restricted in the observable region, and a stereo image display capable of simultaneous observation by a large number of people without special glasses is provided. The present invention has a unique effect of realizing a thin stereoscopic image display device.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an optical path seen from a side surface of the stereoscopic image display device according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of a stereoscopic image display device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing an optical path seen from a side surface of a stereoscopic image display device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an optical path as viewed from the side of a stereoscopic image display device according to another embodiment of the present invention.

FIG. 6 is a diagram showing an optical path as viewed from the side of a stereoscopic image display device according to another embodiment of the present invention.

FIG. 7 is a diagram showing an optical path of a main part of a double-fly eye lens screen according to another embodiment of the present invention when viewed from the side.

FIG. 8 is a diagram showing an optical path of a double fly eye lens screen according to another embodiment of the present invention.

[Explanation of symbols]

 0 Observer 1 Stereoscopic image display device G Video camera D Monochrome liquid crystal television L Convex lens array L1 Double fly eye lens screen A Video tape recorder B Binarization circuit C Stereo sync signal extraction circuit F Matrix circuit H Light source J Color liquid crystal plate K Observer single-sided binary image signal M Observer image signal N Stereo video signal S Stereo sync signal E Spatial modulator

Claims (10)

[Claims] 1. A stereo image correct for the left and right eyes of an observer is provided at a position where a convex lens array is arranged for outputting a stereoscopic image, and at a position behind which a group of face images of the observer is substantially formed. A backlight light source capable of outputting an image so as to distribute the image in a time-division manner, and further, a transparent electric image capable of displaying a stereo image to be observed by the observer in a time-division manner between the observer and the convex lens array. A stereoscopic image display device, which is provided with an optical spatial modulation element group. 2. A convex lens array is arranged to output a stereoscopic image, and a correct stereo image is formed on the left and right eyes of the observer at or near a position where the face image of the observer is substantially formed behind the convex lens array. In order to distribute in parallel in time, a backlight light source capable of outputting two images with right-angled polarization axes is arranged as the left and right eye backlight light sources, and further, the observer and the convex lens array are provided between the observer and the observer. Transparent stereo electro-optical spatial modulation element capable of displaying the stereo images to be observed in parallel with each other and selectively using either one of the polarized lights emitted from the two stereo images as a backlight. A stereoscopic image display device characterized by arranging groups. 3. Between the backlight shown in claim 1 and the transparent electro-optical spatial modulation element group capable of displaying the stereo image, the transmitted light is synchronized with the time division. An electro-optical spatial modulation element capable of rotating a polarization axis by 90 degrees is provided, and further, the backlight according to claim 1 and the electro-optical spatial modulation element capable of displaying a stereo image according to claim 2. A stereoscopic image display device characterized by comprising a combination of 4. Between the backlight shown in claim 1 and the transparent electro-optical spatial modulation element group capable of displaying the stereo image, the transmitted light is synchronized with the time division. An electro-optical spatial modulation element capable of rotating a polarization axis by 90 degrees is provided, and the backlight according to claim 2 and the electro-optical spatial modulation element capable of displaying a stereo image according to claim 1. A stereoscopic image display device characterized by comprising a combination of 5. The stereoscopic image display device according to claim 1, wherein a television camera capable of continuously capturing the image on the observer side is mounted near the convex lens array. 6. The stereoscopic image according to claim 5, wherein the observer is illuminated so that the stereo image can be correctly and selectively transmitted to the left and right eyes of the observer. Display device. 7. The television camera according to claim 5, wherein a binary image of a face of an observer is input when the image on the side of the observer is input to the backlight source according to any one of claims 1 to 4. 7. The stereoscopic image display device according to claim 5, wherein the observer image thus obtained is subjected to image processing. 8. The stereoscopic image display device according to claim 1, wherein the convex lens array is a Fresnel convex lens array. 9. The stereoscopic image display device according to claim 1, wherein the convex lens array is a holographic convex lens array or a diffraction grating lens array. 10. The observer image group output by the backlight light source surface photographed by the television camera and the observer image group imaged by the convex lens array on the backlight light source surface are geometric. 10. The stereoscopic image display device according to claim 5, wherein the taking lens of the television camera according to claim 5 has an array-like structure in order to achieve a geometrical match.