JPH09222584A - Stereoscopic video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic video display device without glasses capable of displaying a stereoscopic video of a picture size larger than a size of a space light modulation element. SOLUTION: This device is constituted of the space light modulation element 1, a projecting convex lens plate 2 on the rear surface of the space light modulation element 1 arranged close to each other, an enlarging convex lens 4 is arranged in front of the element 1 and a division light source 3 alternately making time division emit light on two optional left/right areas on a luminescent surface. In such a case, stereo images for a left eye and a right eye time division displayed on the space light modulation element 1 are enlarged by the enlarging convex lens 4, and are irradiated selectively on left/right both eyes of an appreciator, and the stereoscopic video of the video size larger than the size of the space light modulation element 1 is displayed.

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 that does not require glasses.

[0002]

2. Description of the Related Art In order to display a stereoscopic image without using glasses, some kind of optical action converges the display light rays corresponding to each direction image among the multidirectional images forming the stereoscopic image at the position of the viewer's eyes. By making each convergence point laterally the distance between the left and right eyes of the viewer (pupil distance),
When both eyes are placed at the viewing position, it is necessary to autonomously separate and project the left and right images to the left and right eyes so that they can be viewed as stereoscopic images. In order to obtain such an optical effect, for example, a parallax between the image display device and the viewer.
I used to arrange barriers and lenticular boards.

However, since each directional image obtained by using a parallax barrier or a lenticular plate is displayed at the (1 / number of directions) portion of the display surface of the image display device, the horizontal resolution is lowered. In addition to causing an imbalance in the horizontal and vertical resolutions, in the case of a parallax barrier, there is a decrease in brightness, and in the case of a lenticular plate, there is a limit of separation due to blurring due to lens aberration.

In order to solve such a problem, a spatial light modulator such as a color LCD is used to display a stereo image corresponding to the directional images for the left eye and the right eye of a viewer in a time-division manner, and time is displayed. There is a two-dimensional display device capable of irradiating light from different positions corresponding to the switching, and there is a three-dimensional image display device which displays a three-dimensional image by selectively projecting the respective directional images to the left and right eyes.

FIG. 12 shows, for example, Tokuhyo Hyodai 4-50478.
FIG. 3 is a principle view of the conventional stereoscopic image display device shown in Japanese Patent Publication No. 6 as viewed from above, in which 1 is a spatial light modulator,
Reference numeral 23 is a convex lens plate, 24 is a two-dimensional display device, and 25 is a screen of the two-dimensional display device 24, which emits light at an arbitrary spot 25a on the screen 25. Reference numeral 26 is a time division control circuit for controlling the time division of the stereo image displayed on the spatial light modulator 1 and controlling the light emission of the two-dimensional display device 24, and EYE is the viewpoint of the viewer.

In such a conventional stereoscopic image display device shown in FIG. 12, since the light from the spot 25a passes through the convex lens plate 23, the image displayed on the spatial light modulator 1 is only at the position of the viewpoint EYE. Does not act as a light source.
Therefore, the stereo image displayed on the spatial light modulation element 1 and the light emission position of the spot 25a are controlled by the time division control circuit 26 so as to be switched in a time division manner, so that the stereo image displayed on the spatial light modulation element 1 in a time division manner. Can be separately projected as a directional image for the left and right eyes to the left and right eyes, and can be viewed as a stereoscopic image.

A stereoscopic image display device for displaying a stereoscopic image by arranging two spatial light modulators and two two-dimensional display devices, one for the left eye and one for the right eye, and combining them using a half mirror. There is. FIG. 13 is a front view of a conventional stereoscopic image display device having another structure disclosed in, for example, Japanese Patent Laid-Open No. 7-159723. In FIG. 13, 27 is a monochrome CRT and the two-dimensional display of FIG. It corresponds to the device 24. 28 is a half mirror, 2
Reference numeral 9 is an LED, 30 is a black and white CCD camera, 31 is a signal distributor, 32 is a negative / positive inversion circuit, and 33 is a viewer. As shown in FIG. 13, the stereo images for the left eye and the right eye are displayed on the spatial light modulator 1 independently configured for the left eye and the right eye, and the half mirror 28 is used with the black and white CRT 27 as a light source. After combining, the images are separately projected to the left and right eyes and can be viewed as a stereoscopic image.

Furthermore, the viewer 3 illuminated by the LED 29
The half of the face No. 3 is photographed by the black and white CCD camera 30, and one of the signal distributor 31 is displayed as it is and the other is displayed as a light emitting point on the black and white CRT 27 through the negative / positive inversion circuit 32, whereby the viewer's position is moved. As the light source follows the viewing position, you can view 3D images.

[0009]

In the conventional stereoscopic image display device, it is difficult to increase the screen size because the size at which a stereoscopic image can be displayed is determined by the size of the spatial light modulator such as a color LCD. There was a problem.

Further, there is a problem that an unnatural vision that does not exist in the natural world, such as projection to only one eye, occurs while a viewer moves within a range in which a stereoscopic image can be projected.

Further, since it is necessary to obliquely illuminate the viewer in order to detect the viewer's position, there is a problem in that an illumination device must be installed in addition to the main body of the stereoscopic image display device.

Further, since the stereoscopic images are separately projected onto the left and right eyes of the viewer by the optical action of the convex lens plate, a depth is required as an optical system, which causes a problem that the device becomes large.

The present invention has been made to solve the above problems, and a first object thereof is to provide a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator. I will get it.

A second object is that in a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator, unnatural vision such as projection to only one eye does not occur in the natural world. A stereoscopic image display device that does not occur is obtained.

A third object of the present invention is to provide a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator, the stereoscopic image device being capable of viewing the stereoscopic image only by the main body of the stereoscopic image display device. A stereoscopic image display device provided with a position determination means capable of determining whether or not there is a viewer at a distance from.

A fourth object is a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator, in which the stereoscopic image can be viewed only by the main body of the stereoscopic image display device. (EN) A stereoscopic image display device having a position determination means capable of determining a distance from the device and whether or not a viewer is present at the left and right positions.

A fifth object is to provide a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator, even if the viewer moves left and right, a stereoscopic image can be displayed by the viewer. It is intended to obtain a stereoscopic image display device capable of following a viewpoint.

A sixth object is to provide a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator, even if the viewer moves back and forth, a stereo image can be displayed by the viewer. It is intended to obtain a stereoscopic image display device capable of following a viewpoint.

Further, a seventh object is a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulation element, whereby a change in stereoscopic image caused by a viewer's viewpoint moving (hereinafter, referred to as It is intended to obtain a stereoscopic image display device for viewing motion parallax).

An eighth object is to provide a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator, by only the main body of the stereoscopic image display device being used by the viewer's stereoscopic image device. (EN) A stereoscopic image display device provided with position detecting means capable of detecting a distance and a left and right position.

A ninth object is to obtain a stereoscopic image display device having a short depth in a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator.

A tenth object is to obtain a stereoscopic image display device capable of displaying a flicker-free stereoscopic image in a stereoscopic image display device capable of displaying a stereoscopic image having a screen size larger than the size of the spatial light modulator. is there.

An eleventh object is to obtain a stereoscopic image display device having a short depth.

[0024]

In a stereoscopic image display device according to the present invention, a spatial light modulation element, a projection convex lens plate arranged in proximity to the back surface of the spatial light modulation element, and a front surface of the spatial light modulation element. , A time-division means for time-divisionally displaying a stereo image on the spatial light modulator by alternately switching the stereo image on time, a divided light source for emitting light in an arbitrary partial area on the light emitting surface, and a divided light source for the left and right sides. The light emission control means is configured to alternately emit light in two regions in a time division manner.

Further, a viewer position determining means and a display stopping means are provided.

The position determining means is composed of a beam light source and a beam light receiver.

The position determining means is composed of two beam light sources and two beam light receivers.

The viewer position detecting means and the light emitting position moving means for moving the two left and right light emitting areas of the divided light source are provided.

Further, a projection distance moving means for moving the front and rear positions of the divided light source is provided.

Further, there is provided signal switching means for switching three or more directional images to adjacent two-direction images corresponding to the viewer's viewpoint position.

Further, the position detecting means is constituted by a plurality of sets of beam light sources and beam receivers required for separate projection on the left and right eyes of the viewer within the viewable range.

Further, a plane mirror is provided between the spatial light modulator and the magnifying convex lens plate.

Further, the spatial light modulator, the convex lens plate for projection, and the split light source are independently provided for the left and right eyes of the viewer, and after being combined by the half mirror, they can be viewed as a magnified virtual image by the convex lens plate for expansion. It is configured as follows.

Further, the magnifying convex lens plate is a convex lens plate for shortening the projection distance, which is arranged close to the front surface of the spatial light modulator.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION In a stereoscopic image display device according to an embodiment of the present invention, a spatial light modulator, a projection convex lens plate, a magnifying convex lens plate, a time division means, a divided light source, and a light emission. Since the control means is used, the image displayed by the spatial light modulator can be viewed as an enlarged virtual image.

Further, since the viewer position determining means and the display stopping means are provided, it is possible to prevent the display outside the range in which the stereoscopic image can be projected.

Further, since the position determining means is composed of the beam light source and the beam light receiver, the beam light emitted from the beam light source is emitted only when the viewer is at a distance from the stereoscopic image display device capable of viewing the stereoscopic image. It is possible to have an optical path where the beam passes through the magnifying convex lens plate, is reflected by the viewer, and is reflected by the viewer again to be received by the beam receiver.

Since the position determining means is composed of two sets of beam light sources and beam receivers, the beam light source is provided only when the viewer is at a distance from the stereoscopic image display device capable of viewing stereoscopic images and at the left and right positions. It is possible to have two sets of optical paths, in which the beam light emitted from passes through the magnifying convex lens plate and is reflected by the viewer, and the reflected beam light passes through the magnifying convex lens plate again and is received by the beam receiver. it can.

Further, since the viewer's position detecting means and the light emitting position moving means for moving the two light emitting areas on the left and right of the divided light source are provided, even if the viewer moves the position left and right, the stereo image can be viewed by the viewer. You can follow the viewpoint.

Since the projection distance moving means for moving the front and rear positions of the divided light source is provided, the stereo image can be made to follow the viewpoint of the viewer even if the viewer moves the position forward and backward.

Further, since the signal switching means for switching three or more directional images to adjacent two-direction images corresponding to the viewer's viewpoint position is provided, a stereo image corresponding to the movement of the viewer's viewpoint position is projected on the viewer. can do.

Further, since the position detecting means is composed of a plurality of sets of beam light sources and beam receivers required for separate projection on the left and right eyes of the viewer within the viewable range, a plurality of sets of beam light sources and beams are provided. Only two sets of beam light sources and beam receivers corresponding to the distance from the viewer's stereoscopic image device and the left and right position from the light receiver, the beam light emitted from the beam light source passes through the magnifying convex lens plate, and the viewer Thus, it is possible to have an optical path in which the reflected and reflected beam light passes through the magnifying convex lens plate again and is received by the beam receiver.

Since the plane mirror is provided between the spatial light modulator and the magnifying convex lens plate, the spatial light modulator and
The convex lens plate for projection and the split light source can be arranged on the bottom surface of the stereoscopic image display device.

Further, a spatial light modulator, a convex lens plate for projection, and a split light source are independently provided for the left and right eyes of a viewer, and after being combined by a half mirror, they can be viewed as a magnified virtual image by a convex lens plate for expansion. With this configuration, it is possible to separately project the stereo images on the left and right eyes of the viewer in a time-parallel manner.

Further, since the magnifying convex lens plate is the convex lens plate for shortening the projection distance, which is arranged close to the front surface of the spatial light modulator, the distance between the projecting convex lens plate and the split light source can be shortened. it can.

Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. Embodiment 1. 1 is a principle view of a stereoscopic image display device according to a first embodiment of the present invention as viewed from above. In the figure, 1 is a spatial light modulator, 2 is a convex lens plate for projection, 3 is a split light source, and it is composed of a two-dimensional display such as a CRT or a combination of a surface light source and an optical shutter.
Reference numerals 3L and 3R denote light emitting regions that alternately emit light in a time division manner. Reference numeral 4 is a convex lens plate for enlargement, 5 is a left and right video signal source for outputting a stereo image signal to be displayed on the spatial light modulator 1, and 5L and 5R are left eye video and right eye video signals for outputting video L and R, respectively. Is the source. 6 is a spatial light modulator 1
A time division circuit for alternately switching the stereo images displayed on the time axis, and 7 for dividing the light source 3 into the regions 3L corresponding to the time alternating switching of the stereo images displayed on the spatial light modulator 1.
Division control circuit for controlling to alternately emit light at 3R, 8
Is a magnified virtual image in which the stereo image displayed on the spatial light modulator 1 is magnified by the magnifying convex lens plate 4. L, R
Are areas where the enlarged virtual image 8 can be viewed by the light emission of the areas 3L and 3R of the divided light source 3, respectively.

Next, the operation will be described with reference to FIG. As shown in FIG. 1, the light emitted from the light emitting region 3L of the divided light source 3 is imaged in the region L by the projection convex lens plate 3 and the enlargement convex lens plate 4. On the contrary, when the divided light source 3 is viewed from within the region L, the light emitting region 3L is enlarged over the entire surface of the spatial light modulator 1. That is, within the region L, only the light emitting region 3L of the divided light source 3 acts as the backlight of the spatial light modulator 1. Similarly, within the region R, only the light emitting region 3R acts as a backlight of the spatial light modulator 1. Since the spatial light modulation element 1 does not emit light itself and controls transmitted light to display an image, an image cannot be seen without a backlight.

Therefore, when the light emitting region 3L emits light, the spatial light modulator 1 displays only when viewed from within the region L, and when the light emitting region 3R emits light, only when viewed from within the region R. You can watch the video. As a result, the images L and R are switched at high speed by the time division circuit 6 and displayed on the spatial light modulator 1, and the light emission regions 3R and 3L of the divided light source 3 are switched at high speed by the division control circuit 7 correspondingly. Then, when the left eye is brought into the area L and the right eye is brought into the area R and the spatial light modulation element 1 is seen, the images L and R are separately projected to the left and right eyes, and are separately formed as direction images having different parallax angles. You can see.

Next, it will be described that the images L and R displayed on the spatial light modulator 1 can be viewed as enlarged virtual images. Light emitted from the light emitting regions 3L and 3R of the divided light source 3 is modulated by the spatial light modulator 1 and is equivalent to displaying an image on the surface of the spatial light modulator 1. Therefore, the image displayed on the spatial light modulator 1 can be viewed as a magnified virtual image 8 magnified by the magnifying convex lens plate 4.

Embodiment 2 FIG. 2 is a principle view of a stereoscopic image display device according to a second embodiment of the present invention as seen from above, and the viewer position determining means and the display stopping means are provided in the first embodiment. In the figure, reference numeral 9 denotes a position determiner, which determines whether or not the viewer is in a position where a stereo image can be separately projected. A display stop circuit 10 stops the light emission of the divided light source 3 according to the determination signal of the position determiner 9.

Next, the operation will be described with reference to FIG. As shown in FIG. 2, the position determiner 9 determines whether or not there is a viewer at the positions of the regions L and R where the stereo images can be separately projected by the emission of the light emitting regions 3L and 3R of the divided light source 3. Then, the display stop circuit 10 includes the position determiner 9
The light emission of the divided light source 3 or the light emission stop is switched and controlled by the determination signal of. As a result, the size of the spatial light modulator does not directly occur while the viewer is holding his left and right eyes at the positions of the regions L and R without causing unnatural vision such as projection to only one eye. You can enjoy 3D images with a large screen size.

Embodiment 3. FIG. 3 is a principle view of a stereoscopic image display device according to a third embodiment of the present invention as seen from above, and shows an example of the viewer position determining means according to the second embodiment. In the figure, 11 is a beam light source, 1
2 is a beam receiver. d0 is the distance from the magnifying convex lens plate 4 to the regions L and R where the stereo image can be separately projected on the viewer, d1 is the distance closer than d0, and d2 is the distance farther than d0.

Next, the operation will be described with reference to FIG. As shown in FIG. 3, the beam light emitted from the beam light source 11 passes through the magnifying convex lens plate 4 and is reflected by the viewer at the position of the distance d0, and the reflected beam light passes through the magnifying convex lens plate 4 again. Then, the beam receiver 12 has an optical path to be received. Further, when the viewer is at the distance d1 or d2, the beam light emitted from the beam light source 11 cannot be received by the beam light receiver 12. Therefore, the beam light source 11 and the beam light receiver 12 can determine whether or not there is a viewer at the distance d0 to the regions L and R where the stereo image can be separately projected. As a result, from the front of the stereoscopic image display device, unnatural vision that does not exist in nature, such as projection to only one eye, does not occur while the viewer is holding his left and right eyes to the positions of the regions L and R, It is possible to directly view a stereoscopic image having a screen size larger than the size of the spatial light modulator. Further, the distance to the viewer can be determined only by the main body without installing an illumination device or the like other than the main body of the stereoscopic video display device.

Embodiment 4 FIG. 4 is a principle view of a stereoscopic image display device according to a fourth embodiment of the present invention viewed from above, and shows another example of the viewer position determining means according to the second embodiment. In the figure, 11L and 11R are beam light sources, 12L and 12R are beam receivers, and 13 is a judgment calculation circuit. When both beam receivers 12L and 12R simultaneously receive beam light, the left and right eyes of the viewer are in the region L. , R is determined. w0 is the distance from the optical axis center of the stereoscopic image display device.

Next, the operation will be described with reference to FIG. As shown in FIG. 4, the light beam emitted from the beam light source 11R passes through the magnifying convex lens plate 4 and is reflected at a point on the viewer at a distance d0 and a distance w0 from the center of the optical axis toward the region R, There is an optical path where the reflected beam light passes through the magnifying convex lens plate 4 again and is received by the beam receiver 12R. Similarly, the beam light emitted from the beam light source 11L passes through the magnifying convex lens plate 4, and is reflected and reflected at a point on the viewer at a distance d0 and a distance w0 from the center of the optical axis to the area L side. Again passes through the magnifying convex lens plate 4 and the beam receiver 12
It has an optical path for receiving light at L. Then, the judgment calculation circuit 1
When the beam light is not received by both the beam receivers 12L and 12R at the same time, the control unit 3 controls the display stop circuit 10 to stop the light emission of the split light source 3. Therefore, it is possible to determine not only whether the viewer is at the distance d0, but also whether the viewer is on the optical axis center. As a result, the size of the spatial light modulator does not directly occur while the viewer is holding his left and right eyes at the positions of the regions L and R without causing unnatural vision such as projection to only one eye. You can enjoy 3D images with a large screen size. Further, the position of the viewer can be determined only by the main body without installing an illumination device or the like other than the main body of the stereoscopic video display device.

Embodiment 5 FIG. 5 is a principle view of a stereoscopic image display device according to a fifth embodiment of the present invention viewed from above, and a stereo image is made to follow the viewpoint of the viewer even if the viewer moves to the left or right. It is a thing. In the figure, 14 is a left / right position detector for detecting the left / right position of the viewer, and 15 is a light emitting position control circuit, which moves the light emitting regions 3L, 3R of the divided light source 3 to move the stereo image left and right of the viewer's viewpoint. It controls so that it may be projected following.

Next, the operation will be described. As shown in FIG. 5, when the positions of the light emitting areas 3L and 3R move left and right on the light emitting surface of the divided light source 3, the viewpoint areas L and R at which the stereoscopic image can be viewed also move left and right. Therefore, when the viewer moves to the left and right, the light emitting regions 3L of the divided light sources 3 corresponding to the left and right positions of the viewer detected by the left and right position detector 14,
3R is controlled by the light emission position control circuit 15, and the region L,
By making R follow the viewer, it is possible to always view a stereoscopic image even if the viewer moves left and right.

By the way, in the example of FIG. 5, only the left and right movements of the viewpoint are explained, but by controlling the light emitting regions 3L, 3R of the divided light source 3 up and down by using the left and right position detector 14 as an up and down position detector, It goes without saying that stereoscopic images can always be viewed even if the viewer moves up and down. In addition, when there are a plurality of viewers, the divided light sources 3 have light emitting regions 3L and 3R corresponding to the left and right positions of the plurality of viewers detected by the left and right position detector 14.
It is needless to say that by making a plurality of lights emit and making a plurality of regions L and R follow a plurality of viewers, a stereoscopic image can be always viewed even if the plurality of viewers move left and right. Embodiment 6 FIG.

FIG. 6 is a principle view of a stereoscopic image display device according to a sixth embodiment of the present invention as seen from above, and allows a stereo image to follow the viewpoint of the viewer even if the viewer moves back and forth. It was done like this. In the figure, 16 is a distance detector that detects the distance to the viewer, and 17 is a light source moving device that moves the divided light sources 3 back and forth to project a stereo image following the forward and backward movement of the viewer's viewpoint. To control.

Next, the operation will be described. As shown in FIG. 6, when the split light source 3 moves back and forth, the viewpoint regions L and R where the stereoscopic image can be viewed also move back and forth. Therefore, when the viewer moves forward and backward, the front and rear positions of the divided light sources 3 are controlled by the light source moving device 17 in accordance with the distance to the viewer detected by the distance detector 16, and the regions L and R are viewed. By making the viewer follow the viewer, the stereoscopic image can always be viewed even if the viewer moves back and forth.

Embodiment 7 FIG. FIG. 7 is a principle view of a stereoscopic image display device, which is an example of Embodiment 7 of the present invention, in which a left-right direction motion parallax can be viewed, as viewed from above. In the figure,
Reference numeral 18 denotes a signal left / right switching circuit that selects a stereo image signal corresponding to adjacent direction images of three or more direction images according to the left / right position of the viewer. Further, the left and right video signal source 5 outputs signals of videos A to H corresponding to the viewpoint position. Also, A to H
Is the viewpoint positions of the left and right eyes.

Next, the operation will be described. When the left and right eyes of the viewer are at the positions A and B, the left and right position detector 14 causes the light emitting position control circuit 15 to move the light emitting areas 3L and 3R of the divided light source 3 so as to emit light. At the same time, the signals A and B are selected by the signal left / right switching circuit 18 so as to be displayed on the spatial light modulator 1. Similarly, positions A to H
In the area inside, select the image corresponding to the position of the left and right eyes of the viewer. Therefore, seven stereoscopic images can be displayed with the eight images shown in FIG. As a result, when the viewer moves left and right, the motion parallax according to the movement of the viewpoint position can be viewed.

By the way, the example of FIG. 7 shows the case of eight images, but it goes without saying that an arbitrary number of images may be used. Further, as the motion parallax, only the movement of the left and right viewpoints has been described. By selecting the image,
It goes without saying that the motion parallax according to the movement of the moving viewpoint position up and down and front and back can be appreciated. Further, it goes without saying that the light emitting area of the divided light source 3 may be divided by the number of images and the images may be sequentially switched according to the light emission.

Embodiment 8 FIG. FIG. 8 is a principle view of a stereoscopic image display device according to an eighth embodiment of the present invention viewed from above, and shows an example of a viewer position detecting means according to the seventh embodiment. In the figure, 11a to 11e are beam light sources, 12a to 12e are beam light receivers, and 19 is a horizontal position calculation circuit, which detects the position of the viewer from the signals of the beam light receivers 12a to 12e. In a to e, the beam light from the beam light sources 11a to 11e is received by the beam receivers 12a to 1e, respectively.
It is a reflection point detected by 2e.

Next, the operation will be described with reference to FIG. As shown in FIG. 8, the beam lights emitted from the beam light sources 11a to 11e pass through the magnifying convex lens plate 4, respectively, and are reflected at the reflection points a to e, and the reflected beam light passes through the magnifying convex lens plate 4 again. Then, it has an optical path for being received by the beam receivers 12a to 12e. The left and right position calculation circuit 19
Is the viewpoint positions of the left and right eyes of the viewer, viewpoint positions A and B are detected by reflection at reflection points a and b, and viewpoint positions B and C are reflection points b.
Only, the viewpoint positions C and D are detected by reflection at the reflection points b and c, the viewpoint positions D and E are detected by reflection only at the reflection point c, and the viewpoint positions E and F are detected at the reflection points c and d. The reflection can be detected, the viewpoint positions F and G can be detected by the reflection of only the reflection point d, and the viewpoint positions G and H can be detected by the reflection of the reflection points d and e. That is, in order to detect n viewpoint positions, an integer number of (n / 2) +1 or more beam light sources and beam receivers may be provided.

By the way, in the example of FIG. 8, a case has been shown for detecting eight viewpoint positions, but it goes without saying that an arbitrary number of images may be used. Further, as the motion parallax, only the movement of the viewpoint in the left and right directions has been described. However, by providing a beam light source and a beam receiver so that reflection points are provided in the vertical and front and rear directions, the vertical and forward and backward moving viewpoint positions can be determined. It goes without saying that it can be detected.

Embodiment 9 FIG. 9 is a diagram of a structure of a stereoscopic image display device according to a ninth embodiment of the present invention as seen obliquely from above, in which a plane mirror is provided between the spatial light modulator 1 and a magnifying convex lens plate 4. . In the figure, 20 is a plane mirror. In order to enlarge the stereo image displayed on the spatial light modulation element 1 with the magnifying convex lens plate 4, a space for obtaining an optical path is necessary, and therefore the depth of the stereoscopic image display device is long. Therefore, as shown in FIG. 9, by providing the plane mirror 20 between the spatial light modulator 1 and the magnifying convex lens plate 4, the spatial light modulator 1, the projecting convex lens plate 2, and the split light source 3 are provided. It can be arranged on the bottom surface of the stereoscopic image display device, and as a result, the depth of the stereoscopic image display device can be shortened, and the device can be made compact.

Embodiment 10 FIG. FIG. 10 is a diagram of the structure of a stereoscopic image display device according to a tenth embodiment of the present invention as seen obliquely from above. The spatial light modulator, the convex lens plate for projection, and the split light source are provided to the left and right eyes of the viewer. It is provided independently for each use, and is composed so that it can be viewed as a magnified virtual image with a magnifying convex lens plate after combining with a half mirror. In the figure, 21 is a plane half mirror. As shown in FIG. 10, the spatial light modulator 1 and the projection convex lens plate 2 are provided.
And divided light sources 3 for the left and right eyes of the viewer independently, so that they can be viewed as a magnified virtual image by the magnifying convex lens plate after being combined by the plane half mirror 21, thereby performing time-division display. It is possible to view a stereoscopic image having a screen size larger than the size of the spatial light modulator 1 without causing flicker.

Eleventh Embodiment FIG. 11 is a principle view of a three-dimensional image display device according to an eleventh embodiment of the present invention seen from above, in which the projection lens plate for enlargement is a projection lens plate for shortening the projection distance. In the figure, reference numeral 22 denotes a convex lens plate for shortening the projection distance, which is arranged close to the front surface of the spatial light modulator 1. As shown in FIG. 11, since the projection distance shortening convex lens plate 22 is arranged on the front surface of the spatial light modulation element 1, the projection convex lens plate 2 alone causes the split light source 3 to emit light.
The distance between the projection convex lens plate 2 and the divided light source 3 can be shortened as compared with the case of projecting to the left and right eyes of the viewer. As a result,
The depth of the stereoscopic image display device can be shortened, and the device can be made compact.

[0070]

Since the present invention is configured as described above, it has the following effects.

A spatial light modulator, a convex lens plate for projection,
Since it is composed of the magnifying convex lens plate, the time division means, the divided light source, and the light emission control means, the image displayed by the spatial light modulator can be viewed as a magnified virtual image, so that the viewer can see the spatial light modulator. You can enjoy stereoscopic images with a larger screen size than the size.

Further, since the viewer position determining means and the display stopping means are provided, it is possible to prevent the display outside the range in which the stereoscopic image can be projected, so that the viewer can observe the stereoscopic image. A stereoscopic image having a screen size larger than the size of the spatial light modulation element can be directly viewed without causing unnatural vision that does not exist in nature such as projection to only one eye on the way to the position where it is possible.

Further, since the position determining means is composed of the beam light source and the beam light receiver, the beam light emitted from the beam light source is emitted only when the viewer is at a distance from the stereoscopic image display device capable of viewing the stereoscopic image. Can pass through the magnifying convex lens plate, be reflected by the viewer, and have a light path in which reflected beam light passes through the magnifying convex lens plate again and is received by the beam receiver. The main body alone can determine whether or not the viewer is at a distance from the stereoscopic image device capable of viewing the stereoscopic image.

Since the position determining means is composed of two sets of beam light sources and beam receivers, the beam light source is provided only when the viewer is at a distance from the stereoscopic image display device where stereoscopic images can be viewed and at the left and right positions. It is possible to have two sets of optical paths, in which the beam light emitted from passes through the magnifying convex lens plate and is reflected by the viewer, and the reflected beam light passes through the magnifying convex lens plate again and is received by the beam receiver. Therefore, only the main body of the stereoscopic video display device can determine whether or not the viewer is at the distance from the stereoscopic video device where the viewer can observe the stereoscopic video and the left and right positions.

Further, since the viewer's position detecting means and the light emitting position moving means for moving the two left and right light emitting areas of the divided light source are provided, even if the viewer moves the position left and right, the stereoscopic image of the viewer can be displayed. It is possible to follow the viewpoint, so that a stereoscopic image having a screen size larger than the size of the spatial light modulator can be viewed regardless of the left and right position of the viewer.

Since the projection distance moving means for moving the front and rear positions of the divided light source is provided, the stereo image can be made to follow the viewpoint of the viewer even if the viewer moves the position forward and backward. A stereoscopic image with a larger screen size than the size of the spatial light modulator can be viewed regardless of the front-back position of the person.

Further, since the signal switching means for switching three or more directional images to adjacent two-direction images corresponding to the viewer's viewpoint position is provided, a stereo image corresponding to the movement of the viewer's viewpoint position is projected on the viewer. Therefore, a stereoscopic image having a screen size larger than the size of the spatial light modulator having motion parallax can be viewed.

Further, since the position detecting means is composed of a plurality of sets of beam light sources and beam receivers required for separate projection on the left and right eyes of the viewer within the viewable range, a plurality of sets of beam light sources and beams are provided. Only two sets of beam light sources and beam receivers corresponding to the distance from the viewer's stereoscopic image device and the left and right position from the light receiver, the beam light emitted from the beam light source passes through the magnifying convex lens plate, and the viewer Since the reflected and reflected beam light can pass through the magnifying convex lens plate again and can be received by the beam receiver, the distance from the viewer's stereoscopic image device can be increased only by the main body of the stereoscopic image display device. And a position detecting means capable of detecting the left and right positions.

Further, since the plane mirror is provided between the spatial light modulator and the magnifying convex lens plate, the spatial light modulator,
The convex lens plate for projection and the split light source can be arranged on the bottom surface of the stereoscopic image display device, and thus the depth of the stereoscopic image display device can be shortened.

Further, the spatial light modulator, the convex lens plate for projection, and the split light source are independently provided for the left and right eyes of the viewer, and after being combined by the half mirror, they can be viewed as a magnified virtual image by the convex lens plate for expansion. With this configuration, the stereo images can be separately projected on the left and right eyes of the viewer in parallel in time, so that a stereoscopic image without flicker can be viewed with a screen size larger than the size of the spatial light modulator. it can.

Since the magnifying convex lens plate is the convex lens plate for shortening the projection distance, which is arranged close to the front surface of the spatial light modulator, the distance between the projecting convex lens plate and the split light source can be shortened. Therefore, the depth of the stereoscopic image display device can be shortened.

[Brief description of drawings]

FIG. 1 is a principle view of a stereoscopic image display device according to a first embodiment of the present invention viewed from above.

FIG. 2 is a principle diagram of a stereoscopic image display device according to a second embodiment of the present invention as viewed from above.

FIG. 3 is a principle view of a stereoscopic image display device according to a third embodiment of the present invention as seen from above.

FIG. 4 is a principle view of a stereoscopic image display device according to a fourth embodiment of the present invention as viewed from above.

FIG. 5 is a principle view of a stereoscopic image display device according to a fifth embodiment of the present invention as viewed from above.

FIG. 6 is a principle diagram of a stereoscopic image display device according to a sixth embodiment of the present invention as viewed from above.

[Fig. 7] Fig. 7 is a principle view of a stereoscopic image display device, which is an example of a seventh embodiment of the present invention, in which a motion parallax in a horizontal direction can be viewed, as viewed from above.

FIG. 8 is a principle view of a stereoscopic image display device according to an eighth embodiment of the present invention viewed from above.

FIG. 9 is a diagram showing a structure of a stereoscopic image display device according to a ninth embodiment of the present invention as seen obliquely from above.

FIG. 10 is a diagram showing a structure of a stereoscopic image display device according to a tenth embodiment of the present invention as seen obliquely from above.

FIG. 11 is a principle view of a stereoscopic image display device according to an eleventh embodiment of the present invention as seen from above.

FIG. 12 is a principle view of a conventional stereoscopic image display device viewed from above.

FIG. 13 is a front view of a conventional stereoscopic image display device having another configuration.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 spatial light modulator, 2 convex lens plate for projection, 3 divided light sources, 4 convex lens plate for enlargement, 5 left and right video signal sources, 6
Time division circuit, 7 division control circuit, 8 magnified virtual image, 9
Position determiner, 10 emission stop circuit, 11 beam light source,
12 beam receiver, 13 judgment arithmetic circuit, 14 left and right position detector, 15 light emitting position control circuit, 16 distance detector, 17 light source moving device, 18 signal left and right switching circuit, convex lens plate for shortening projection distance.

Claims (11)

[Claims] 1. A spatial light modulation element, a projection convex lens plate arranged in the vicinity of the rear surface of the spatial light modulation element, and an image displayed by the spatial light modulation element which is arranged in front of the spatial light modulation element and is an enlarged virtual image. A convex lens plate for enlarging so that the stereoscopic image corresponding to the direction image for the left eye and the right eye of the viewer can be alternately switched in time division display on the spatial light modulation element, and time division means, A split light source that emits light in an arbitrary partial area on the light emitting surface, and a light emission control unit that alternately emits the split light source in two left and right areas in a time-division manner so as to selectively project a stereo image to the left and right eyes of a viewer A stereoscopic image display device characterized by being configured. 2. The stereoscopic image display apparatus according to claim 1, further comprising a viewer position determining means and a display stopping means. 3. The position determining means comprises a beam light source disposed on the left and right of the spatial light modulator and a beam light receiver,
Only when there is a viewer at a distance from the 3D image display device that can view 3D images, the beam light emitted from the beam light source passes through the magnifying convex lens plate, is reflected by the viewer, and the reflected beam light is magnifying convex lens plate again. 3. The stereoscopic image display device according to claim 2, wherein the stereoscopic image display device has an optical path that passes through the beam receiver and is received by the beam receiver. 4. The position determining means is composed of two sets of beam light sources and beam receivers arranged on the left and right of the spatial light modulator, and the distance and the left and right position from the stereoscopic image display device for viewing stereoscopic images. Only when there is a viewer in the room, the beam light emitted from the beam source passes through the magnifying convex lens plate and is reflected by the viewer. The reflected beam light passes through the magnifying convex lens plate again and is received by the beam receiver. The three-dimensional image display device according to claim 2, wherein the three-dimensional image display device has two sets of optical paths. 5. A viewer position detecting means and two left and right light emitting areas of the divided light source are moved so as to selectively project a stereo image to the left and right eyes of the viewer by following the left and right positions of the viewer. The stereoscopic image display device according to claim 1, further comprising a light emitting position moving means for causing the light emitting position to move. 6. The stereoscopic image display apparatus according to claim 5, further comprising a projection distance moving unit that moves the front and rear positions of the divided light source in accordance with the distance to the viewer. 7. The stereoscopic image display apparatus according to claim 5, further comprising signal switching means for switching three or more directional images to adjacent two-direction images corresponding to a viewer's viewpoint position. 8. The position detecting means comprises a plurality of sets of beam light sources and beam receivers required for separate projection on the left and right eyes of a viewer within a viewable range. The stereoscopic image display device according to claim 7. 9. The stereoscopic image display device according to claim 1, further comprising a plane mirror provided between the spatial light modulator and the magnifying convex lens plate. 10. A spatial light modulator, a convex lens plate for projection, and a split light source are independently provided for the left and right eyes of a viewer, and can be viewed as a magnified virtual image by a magnifying convex lens plate after combining with a half mirror. The three-dimensional image display device according to any one of claims 1 to 8, wherein the three-dimensional image display device is configured as described above. 11. The stereoscopic lens according to claim 1, wherein the magnifying convex lens plate is a convex lens plate for shortening a projection distance, which is arranged close to the front surface of the spatial light modulator. Video display device.