JPH11103474A - Stereoscopic picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a stereoscopic dynamic picture as well as a stereoscopic still picture of multi view points with a simple structure. SOLUTION: This device is equipped with a semiconductor laser 15 for emitting a laser beam, a polygon mirror 17 and a galvano mirror 21 for scanning the laser beam from this semiconductor laser 15 in a main scanning direction and a sub-scanning direction, a first cylinder lens array 19 for deflecting in the main scanning line at a deflection angle that cyclically changes the scanned laser beam in the main scanning direction at an incident position, a second cylinder lens array 22 for spreading the laser beam deflected by this first cylinder lens array 19 in the sub-scanning direction, and a semiconductor laser beam driving circuit 13 for modulating a driving current of the semiconductor laser 15 so that plural pictures project themselves in each direction corresponding to a pickup direction on the basis of plural picture data picked up from plural view points in correspondence to the deflection angle by the first cylinder lens array 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image display device capable of displaying a moving image.

[0002]

2. Description of the Related Art Hitherto, various attempts have been made to display a stereoscopic image. For example, a hologram is a well-known stereoscopic image display means and is based on the principle of wavefront reproduction. Although it is an excellent means of obtaining a video, it is troublesome to create, and its use is limited to stereoscopic display of a still image.

In order to make up for the disadvantage of such a hologram,
Using images shot from multiple different viewpoints at the expense of complete wavefront reproduction, the viewer's right and left eyes can see images from different viewpoints. There is a method to create an illusion as if watching a video. In this method, it is necessary to prepare images shot from a plurality of viewpoints. However, since images can be shot much more easily than holograms, moving images can be displayed. In addition, there are two types of this method, one in which the observer must wear instruments such as special glasses for observing a stereoscopic image, and the other in which it is not necessary.

A well-known example of the former is:
There are those that project images taken from two viewpoints through two polarizing plates whose polarization directions are orthogonal to each other, and observe it using glasses made of two polarizing plates whose polarization directions are orthogonal, It has been put to practical use in screening three-dimensional movies. In addition, there is a type that uses liquid crystal shutter glasses to alternately open the right-eye and left-eye shutters and alternately displays images for the right-eye and left-eye in synchronization with this, and has been put to practical use in combination with a video monitor. . There is also a type using a head-mounted display, in which two small displays are provided, and images are separately displayed on these displays to obtain a stereoscopic image.

As an example of the latter, a lenticular system is well known. This is done by decomposing the images taken from two viewpoints into strips, displaying them alternately on a liquid crystal display, etc., and separating the two images left and right with a lenticular killer lens placed in front of the display. When this is observed, different images enter the right and left eyes and a stereoscopic image is observed. In this system, there are a number of modified examples such as those using a parallax barrier or a hologram in addition to a lenticular lens as an image separating means.

[0006] As an example of such a system, Japanese Optical Society Design Research Group magazine No. 12, page 36 to page 41. As another example of the system, the journal No. A plurality of lasers or a plurality of LED light sources generate a light beam converging at one point described in page 12, page 48 to page 53, and a high-speed raster scan of the convergence point using a polygon mirror or a galvanometer mirror, and each laser Alternatively, there is a type in which each LED is independently modulated to display a stereoscopic image having the same number of viewpoints as the number of light sources.

[0007]

However, the conventional stereoscopic image display technology has the following problems. That is, the hologram can obtain a fine stereoscopic image, but it is difficult to display a moving image. In addition, if the observer wears the instrument, it places a burden on the observer,
If used for a long time, there is a possibility that health problems such as fatigue may occur. Further, in the lenticular method, the burden on the observer is reduced because no instrument is mounted, but there is a problem that the observation position where a good stereoscopic image can be observed is limited to an extremely narrow range. Further, the method of scanning a converged light beam is to increase the number of viewpoints to increase the range in which a stereoscopic image can be observed and to improve the disadvantage of the lenticular system. There is a problem that the apparatus must be prepared and the apparatus becomes complicated.

Accordingly, the present invention provides a three-dimensional video display device capable of displaying not only a multi-view stereoscopic still image but also a multi-view stereoscopic moving image with a simple configuration.

[0009]

According to the first aspect of the present invention,
A laser light source for generating laser light, scanning means for raster-scanning the laser light from the laser light source in a main scanning direction and a sub-scanning direction, and a laser light scanned by the scanning means in the main scanning direction depending on an incident position. Deflecting means for deflecting in the main scanning direction at a deflecting angle that varies periodically, diffusing means for diffusing laser light deflected by the deflecting means in the sub-scanning direction, Modulation that modulates laser light such that the plurality of images are projected in respective directions corresponding to the shooting directions based on data of a plurality of shot images or a plurality of images synthesized as if shot from a plurality of viewpoints. Means.

According to a second aspect of the present invention, in the stereoscopic image display device according to the first aspect, the laser light source includes a semiconductor laser, and the modulating means modulates a driving current of the semiconductor laser to modulate the laser light. It is in.

According to a third aspect of the present invention, there is provided a laser light source for generating laser light, scanning means for raster-scanning the laser light from the laser light source in a main scanning direction and a sub-scanning direction, and scanning by the scanning means. Deflecting means for deflecting laser light in the main scanning direction at a deflection angle periodically changing in the main scanning direction depending on the incident position; converging means for converging laser light incident on the deflecting means; and laser deflected by the deflecting means. Based on diffusion means for diffusing light in the sub-scanning direction, and data of a plurality of images taken from a plurality of viewpoints or data of a plurality of images synthesized as if taken from a plurality of viewpoints corresponding to the deflection angle by the deflecting means. And a modulating means for modulating the laser light so that the plurality of images are projected in respective directions corresponding to the photographing directions.

According to a fourth aspect of the present invention, in the stereoscopic image display device according to any one of the first to third aspects, the deflecting means comprises a cylindrical lens array in which a plurality of cylindrical lenses are arranged in the main scanning direction. is there.

According to a fifth aspect of the present invention, there is provided the stereoscopic image display device according to any one of the first to third aspects, wherein the deflecting means comprises a plurality of lenses arranged in both the main scanning direction and the sub-scanning direction. The scanning interval in the sub-scanning direction is made equal to the array interval in the sub-scanning direction of the microlens array.

According to a sixth aspect of the present invention, there are provided a plurality of laser light sources for generating laser lights of different wavelengths, a plurality of modulating means for respectively modulating the laser lights from the respective laser light sources,
Laser light combining means for combining the laser light modulated by each of the modulation means into one laser light; scanning means for raster-scanning the laser light combined by the combining means in a main scanning direction and a sub-scanning direction; Deflecting means for deflecting the laser light scanned by the means in the main scanning direction at a deflection angle periodically changing in the main scanning direction depending on the incident position; and diffusion for diffusing the laser light deflected by the deflecting means in the sub-scanning direction. Each modulating means generates each of the laser light sources in a plurality of images taken from a plurality of viewpoints or in a plurality of images synthesized as if taken from a plurality of viewpoints in accordance with the deflection angle by the deflecting means. The laser light is modulated based on data for each of a plurality of color components corresponding to each wavelength of the laser light so that a plurality of images are projected in respective directions corresponding to the photographing directions. In the door.

According to a seventh aspect of the present invention, there is provided a laser light source for generating laser light containing a plurality of different wavelength components, a modulating means for modulating the laser light from the laser light source for each wavelength component, and a modulating means. Scanning means for raster-scanning the modulated laser light in the main scanning direction and sub-scanning direction, and deflecting the laser light scanned by the scanning means in the main scanning direction at a deflection angle periodically changing in the main scanning direction depending on the incident position. Deflecting means, and a diffusing means for diffusing the laser light deflected by the deflecting means in the sub-scanning direction. The modulating means comprises a plurality of images or a plurality of images taken from a plurality of viewpoints corresponding to the deflection angles of the deflecting means. A plurality of images are projected in respective directions corresponding to the shooting directions based on data for each of a plurality of color components corresponding to wavelength components of the plurality of images synthesized as if shot from a plurality of viewpoints. It is to modulate the laser beam for each wavelength component so that.

When a human recognizes a three-dimensional object visually, binocular parallax plays an important role. That is, when viewing a three-dimensional object, the right eye and the left eye see the three-dimensional object from different viewpoints, so that different images are viewed, and the three-dimensional object is recognized based on this difference. In the present invention, when viewing the display device from different viewpoints, a binocular disparity is generated by displaying an image captured from a different viewpoint or an image synthesized as if captured from a different viewpoint by computer graphics or the like. To display a three-dimensional object.

Here, the principle of generating binocular parallax will be described. As shown in FIG. 1, a scanning means scans a laser beam LB from a laser light source, and a raster scan of the deflection means 1 is performed. The laser beam LB incident on the deflecting unit 1 is deflected in the main scanning direction at different angles according to the incident position, and is diffused in the sub-scanning direction by the diffusing unit 2.

FIG. 2 is a view showing the deflecting means 1 viewed from the sub-scanning direction. Here, a case where a cylindrical lens array in which a plurality of cylindrical lenses are arranged in the main scanning direction is used as the deflecting means 1 is shown. Although shown, even if it is a microlens array in which a plurality of lenses are arranged in both the main scanning direction and the sub-scanning direction, or even if a diffraction grating, a hologram, or the like is used, the same operation can be obtained.

Now, assuming that an image is displayed as a stereoscopic image at the point A, when a laser beam scans the deflecting means 1, a straight line connecting the point A and the focal point of each cylindrical lens of the deflecting means 1 is defined by each cylindrical lens. When the laser light is modulated by the modulating means so that the laser light is turned on at the intersection P, the laser light is deflected by the deflecting means 1 and emitted in the directions of Q1, Q2, Q3, Q4 and Q5, respectively. This coincides with the direction in which the light emitted from point A travels.

In this state, when the observer M1 at the position T1 observes the direction of the deflecting means 1, the laser light Q1 is incident on the right eye (R) of the observer M1, and the laser light Q2 is incident on the left eye (L).
Is incident, and binocular parallax occurs, and a stereoscopic image is observed at point A.
Laser light Q4 is incident on the right eye (R) of the observer M2 at the position T2, and laser light Q5 is incident on the left eye (L), so that binocular parallax occurs and a stereoscopic image is observed at point A. Further, since the laser light is diffused in the sub-scanning direction by the diffusing means 2, a three-dimensional image can be observed even if the positions of the observers M1 and M2 move in the sub-scanning direction.

In the figure, since the laser beam is represented by a straight line, no laser beam exists in a direction other than the laser beams Q1 to Q5, and no image is observed at a position in this direction. The light has a spread, and the deflection means 1
At a position apart from the camera by a predetermined distance or more, observation can be performed at a continuous position. Here, for the sake of simplicity, the case where one point A is stereoscopically displayed has been described. However, when a plurality of points are stereoscopically displayed, the laser light is similarly turned on at the position corresponding to each point. By modulating the laser light, a plurality of points can be displayed three-dimensionally. Further, since an image is a collection of countless points, it can be displayed three-dimensionally on the same principle.

When a laser is modulated based on data of an image taken from a plurality of viewpoints or a plurality of images synthesized as if taken from a plurality of viewpoints, for example, as shown in FIG. To display image data taken from the five cameras CA1, CA2, CA3, CA
4. Capture the object from different angles using CA5. Note that F in the drawing is a visual field frame.

The laser beam is modulated based on the image data thus obtained, as shown in FIG. FIG. 4A shows a state in which the laser beam LB is scanning near the position (x, y) on the deflecting means 1. When a cylindrical lens array is used as the deflecting means 1 as shown in FIG. 4 (b), the cylindrical lenses are adjusted so that each cylindrical lens includes a deflection angle corresponding to the photographing direction of each of the cameras CA1 to CA5. It is divided into sections t1 to t5 of the same number as the number. Here, the sections t1 to t5
Correspond to the shooting directions of the cameras CA1 to CA5, respectively. FIG. 5 shows image data photographed by the cameras CA1 and CA5.

When the laser beam LB scans the section t1, the corresponding position (x,
The laser light is modulated based on the data of y). As a modulation method, the output of the laser may be modulated, or the lighting time in the section may be pulse width modulated. The laser beam is similarly modulated in the other sections t2 to t5. In this way, stereoscopic display can be performed using the image data of the cameras CA1 to CA5.

Since the laser light is modulated by alternately using the image data obtained from a plurality of viewpoints as described above, the diameter of the laser light on the deflecting means must be adjusted in order to satisfactorily separate the projection directions of these images. It is desirable that the laser beam be as small as possible. For this purpose, it is effective to provide a converging means and converge the laser beam on the deflecting means.

As a modulating means, an external modulator such as an acousto-optic element can be used. However, when a semiconductor laser oscillator is used as a laser light source, its driving current can be modulated to modulate the laser output, and the device can be made compact. There is an advantage in the conversion. Also, a plurality of laser light sources having different wavelengths, for example,
If laser light sources corresponding to the three primary colors of red, green, and blue are used, and each is modulated based on color data of an image, a color stereoscopic image can be displayed. An equivalent effect is obtained by decomposing laser light from a white laser oscillator into laser light of different wavelengths using a color separation element such as a color separation prism, diffraction grating, dichroic mirror, etc. Can be obtained even if modulated. Further, since the display device of the present invention is a display device of a raster scanning type like a television receiver, a three-dimensional moving image can be displayed by performing raster scanning at a sufficiently high speed, for example, at several tens of frames / second.

[0027]

Embodiments of the present invention will be described with reference to the drawings. (First Embodiment) This embodiment relates to claims 1 to 4.
An embodiment corresponding to FIG. In FIG.
11 is a modulation signal generator, and this modulation signal generator 11
The information of the start timing of the main scanning is obtained from the signal from the start sensor 12, and five video cameras (not shown) are obtained.
At the appropriate timing, appropriate data is selected from the image data D1 to D5 created by photographing from different viewpoints, a modulation signal is generated based on the selected data, supplied to the semiconductor laser drive circuit 13, and The scanning position signal is supplied to the motor control circuit 14.

The semiconductor laser drive circuit 13 constitutes a modulating means, and modulates and drives the semiconductor laser 15 constituting the laser light source by modulating the semiconductor laser drive current based on the modulation signal. The semiconductor laser 15 is modulated and driven by the semiconductor laser drive circuit 13 and generates a modulated laser beam necessary for stereoscopically displaying images captured from a plurality of viewpoints.

The laser light generated from the semiconductor laser 15 is shaped by a collimator lens 16 and is incident as a parallel laser light on a reflection surface of a polygon mirror 17 constituting a scanning means in the main scanning direction. The polygon mirror 1
Numeral 7 rotates in the direction indicated by the arrow in the figure and scans the laser beam in the main scanning direction. At this time, the start timing of the main scanning is such that the laser beam is detected by the start sensor 12 disposed in the main scanning plane, and the modulation signal generator 11 is notified by the detection signal.

The laser beam scanned in the main scanning direction by the polygon mirror 17 is directed to an fθ lens 18 as a converging means.
Converges so as to form a beam waist on the first cylindrical lens array 19 which is a deflecting means. Fθ
The lens 18 controls the laser beam so as to be perpendicularly incident on the first cylindrical lens array 19 and scan the cylindrical lens array 19 at a constant speed.

The motor control circuit 14 controls the driving of a motor 20, and the motor 20 swings a galvano mirror 21 constituting a scanning means in the sub-scanning direction. That is, a sub-scanning position signal is sent from the modulation signal generator 11 to the motor control circuit 14, and the motor control circuit 14
The motor 20 is controlled so that 1 has an appropriate swing angle.
The galvanomirror 21 swings around a rotation axis parallel to the main scanning plane, and scans the laser beam from the fθ lens 18 in the sub-scanning direction.

The first cylindrical lens array 19 has a plurality of cylindrical lenses arranged in the main scanning direction. The laser light raster-scanned by the polygon mirror 17 and the galvano mirror 21 is changed according to the incident position in the main scanning direction. The deflection in the main scanning direction is performed at a deflection angle that changes periodically in the main scanning direction, that is, at a different deflection angle depending on the position in the main scanning direction.

The laser light deflected by the first cylindrical lens array 19 is incident on a second cylindrical lens array 22 which is a diffusion means. The second cylindrical lens array 22
Is a plurality of small-diameter cylindrical lenses arranged in the sub-scanning direction. The laser light deflected by the first cylindrical lens array 19 is diffused in the sub-scanning direction. With this configuration, the observer 23 can observe a three-dimensional still image or a three-dimensional moving image on the diffused light emission side of the second cylindrical lens array 22.

In such a configuration, the semiconductor laser 1
For example, when a red semiconductor laser having an oscillation wavelength of 630 nm is used as 5, the stereoscopic image is displayed in red. The collimator lens 16 emits a laser beam, for example, having a diameter of about 6 mm.
Into a beam. The polygon mirror 17 is a regular dodecagonal prism having twelve reflecting surfaces, for example, 36,000 rpm
m. Therefore, 7,200 lines / second main scanning lines are formed.

Each reflecting surface of the polygon mirror 17 has an angle of 30 degrees with respect to the center, of which 20 degrees is used for image formation. Therefore, the scanning angle of the raster main scanning is 40 degrees. The focal length of the fθ lens 18 is, for example, 220 mm, and the focal point on the incident side is set so as to substantially coincide with the laser light reflection point of the polygon mirror 17. Further, the length of the scanning line on the emission side of the fθ lens 18 is set to 160
mm. Therefore, the effective diameter on the main scanning side on the emission side is 16
Make it larger than 0mm. Further, since the laser beam emitted from the fθ lens 18 is perpendicular to the first cylindrical lens array 19, the size of the displayed image in the main scanning direction is 160
mm.

The galvanometer mirror 21 is, for example, 30 Hz
And scans in the sub-scanning direction. Therefore, a stereoscopic video is displayed at a rate of 30 frames / second, and a moving image can be displayed. Since the main scanning lines are formed at 7,200 lines / second, one frame is formed of 240 scanning lines (horizontal scanning lines). The swing speed of the galvanomirror 21 is adjusted so that the interval between adjacent scanning lines on the first cylindrical lens array 19 is 0.5 mm. Therefore, the size of the displayed image in the sub-scanning direction is 120 mm.

The first cylindrical lens array 19 includes, for example,
As shown in FIG. 7, 320 cylindrical lenses each having a width of 0.5 mm are arranged in the main scanning direction, and are arranged at the focal position of the fθ lens 18. The cylindrical lens array 19 is formed by shaping an acrylic resin having a refractive index of 1.48.
The exit surface of each cylindrical lens has a radius of curvature of 0.3 mm and a focal length of 0.63 mm. The diameter of the laser beam incident on the cylindrical lens array 19 is converged to about 0.03 mm.

When the laser beam crosses the boundary between the cylindrical lenses of the first cylindrical lens array 19, scattered light may be generated and noise may be generated in the image. Noise can be reduced by turning off the light or providing a light shielding means at the boundary.

The second cylindrical lens array 22 is arranged near the emission side of the first cylindrical lens array 19 and has a shape similar to that of the first cylindrical lens array 19, but the arrangement direction of the cylindrical lenses is The distance between the cylindrical lenses in the sub-scanning direction is smaller than the diameter of the laser beam. With such a configuration, not only a multi-viewpoint stereoscopic still image but also a multi-viewpoint stereoscopic moving image can be displayed with a simple configuration.

In this embodiment, the cylindrical lens array 19 is used as the deflecting means. However, the present invention is not limited to this. A plurality of lenses are arranged in both the main scanning direction and the sub-scanning direction shown in FIG. A microlens array 24 or a unit having an equivalent function such as a diffraction grating or a hologram may be used. In addition, although the cylindrical lens array 22 is used as the diffusing means, the present invention is not limited to this, and means having equivalent functions such as a diffraction grating and a hologram may be used. Note that the lens interval d in the sub-scanning direction of the microlens array 24 must be equal to the sub-scanning line interval.

In this embodiment, the fθ lens 18
The laser beam is vertically incident on the first cylindrical lens array 19 and is scanned at a constant speed.
The fθ lens is not always necessary. Where fθ
When the lens is not used, the incident angle and the scanning speed change depending on the incident position. Therefore, the modulation timing of the laser light is changed depending on the scanning position, and the first cylindrical lens array 19
It is necessary to change the interval and shape of each cylindrical lens according to the scanning position. It is also desirable to change the laser beam emitted from the collimator lens into a convergent beam.

(Second Embodiment) In this embodiment, an embodiment according to claim 6 will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 9, color image data CD1 to CD5 created by photographing from five different viewpoints with five color video cameras (not shown) are input to a color signal separation circuit 25. This color signal separation circuit 25
The color image data CD1 to CD5 are separated into three primary color signals of red, green and blue, and the red color signal R is converted into a modulation signal generator 26.
R, the green color signal G is supplied to the modulation signal generator 26G, and the blue color signal B is supplied to the modulation signal generator 26B.

Each of the modulation signal generators 26R, 26G, 2
6B are the color signals R, G, B and the start sensor 1 respectively.
A modulation signal is generated based on the signals from the second and second semiconductor laser driving circuits 27R, 27G, and 27B, and a sub-scanning position signal is supplied from the modulation signal generator 26B to the motor control circuit 14. Each of the semiconductor laser driving circuits 27R, 27G, and 27B constitutes a modulating unit, and modulates and drives the semiconductor lasers 28R, 28G, and 28B that constitute the laser light sources by modulating the semiconductor laser driving current based on the modulation signal. .

The semiconductor laser 28R is modulated and driven by the semiconductor laser drive circuit 27R, and generates a modulated red laser beam necessary for displaying images taken from a plurality of viewpoints in three-dimensional color. The semiconductor laser 28
G is modulated and driven by the semiconductor laser driving circuit 27G, and generates green laser light which has been subjected to modulation necessary for displaying images taken from a plurality of viewpoints in three-dimensional color. The semiconductor laser 28B is connected to the semiconductor laser drive circuit 27.
B modulates and generates a modulated blue laser beam necessary for displaying an image taken from a plurality of viewpoints in a color stereoscopic manner.

The red laser light generated from the semiconductor laser 28R is shaped by the collimator lens 29R and is incident on the reflection mirror 30 as parallel laser light. The green laser light generated from the semiconductor laser 28G is shaped by a collimator lens 29G and is incident on the dichroic mirror 31 as parallel laser light. The blue laser light generated from the semiconductor laser 28B is shaped by the collimator lens 29B and is incident on the dichroic mirror 32 as parallel laser light.

The reflection mirror 30 reflects the red laser light, bends it at a right angle, and enters the dichroic mirror 31. The dichroic mirror 31 reflects green light and transmits other light, reflects the green laser light from the semiconductor laser 28G and bends it at a right angle.
The red laser light from the reflection mirror 30 is transmitted as it is, and the combined light of the red laser light and the green laser light is incident on the dichroic mirror 32. The dichroic mirror 32 transmits the blue light and reflects the other light, transmits the blue laser light from the semiconductor laser 28B, and reflects the combined light of the red laser light and the green laser light. The laser light obtained by bending the laser light at right angles and combining the red, green, and blue laser lights is incident on the reflection surface of the polygon mirror 17.

The polygon mirror 17 scans the incident laser light in the main scanning direction, and the scanned laser light is fθ
After passing through the lens 18, it is scanned in the sub-scanning direction by the galvanomirror 21, and raster-scans the first cylindrical lens array 19. Then, the laser light is deflected in the main scanning direction by the first cylindrical lens array 19, further diffused in the sub-scanning direction by the second cylindrical lens array 22, and emitted toward the observer 23. In this way, a multi-viewpoint color stereoscopic still image or color stereoscopic moving image can be displayed with a simple configuration, and the observer 23 can see it.

(Third Embodiment) In this embodiment, an embodiment corresponding to claims 7 and 8 will be described. The same parts as those in the first and second embodiments are denoted by the same reference numerals, and different parts will be described.

As shown in FIG. 10, a white laser oscillator 33 is provided as a laser light source for generating laser light containing a plurality of different wavelength components. This white laser oscillator 33
Is a laser light source that emits laser light that looks white because it simultaneously oscillates red, green, and blue spectra.

The laser light from the white laser oscillator 33 is shaped into parallel laser light by a collimator lens 34, and then enters a dichroic mirror 35. The dichroic mirror 35 transmits red light and reflects other light. The dichroic mirror 35 transmits red laser light and enters the external modulator 38R.

The laser light reflected by the dichroic mirror 35 is incident on the dichroic mirror 36.
The dichroic mirror 36 reflects the green light and transmits the other light, and reflects the green laser light to enter the external modulator 38G. The laser light transmitted through the dichroic mirror 36 is reflected by a reflection mirror 37 and is incident on an external modulator 38B.

The dichroic mirrors 35 and 36 constitute wavelength separating means, and the external modulators 38R and 38R respectively.
G and 38B constitute a modulating means. The dichroic mirror 35 separates red laser light from white laser light, and the dichroic mirror 36 separates green laser light. Therefore, the dichroic mirror 36
Is reflected by the reflection mirror 37 to be blue laser light.

Further, color image data CD1 to CD5 created by taking images from different viewpoints with five color video cameras (not shown) are input to a color signal separation circuit 25. The color signal separation circuit 25 separates the color image data CD1 to CD5 into three primary color signals of red, green and blue, and supplies a red color signal R to a modulation signal generator 26R.
The green color signal G is supplied to the modulation signal generator 26G, and the blue color signal B is supplied to the modulation signal generator 26B.

Each of the modulation signal generators 26R, 26G, 2
6B are the color signals R, G, B and the start sensor 1 respectively.
A modulation signal is generated based on the signal from the second and the external modulators 38R, 38G, and 38B are driven to modulate the red, green, and blue laser beams. The external modulators 38R, 38G, 38B
A light modulator such as an acousto-optic device is used as the light source.

The external modulators 38R, 38G, 38B
The laser beams of the respective colors modulated by are combined by the reflection mirror 30 and the dichroic mirrors 31 and 32 and are incident on the reflection surface of the polygon mirror 17. The polygon mirror 17 scans the incident laser light in the main scanning direction. After the scanning laser light passes through the fθ lens 18, the scanning laser light is scanned in the sub-scanning direction by the galvanometer mirror 21, and is scanned on the first cylindrical lens array 19. Is raster-scanned.
Then, the laser light is deflected in the main scanning direction by the first cylindrical lens array 19, further diffused in the sub-scanning direction by the second cylindrical lens array 22, and emitted toward the observer 23. In this way, a multi-viewpoint color stereoscopic still image or color stereoscopic moving image can be displayed with a simple configuration, and the observer 23 can see it.

In this embodiment, the collimator lens 34 is arranged between the white laser oscillator 33 and the dichroic mirror 35 to perform beam shaping before color separation of laser light. Since the convergence characteristics differ slightly depending on the wavelength, if the beam is shaped using a collimator lens for each laser beam that has been color-separated by a dichroic mirror, the configuration will be slightly complicated, but a higher quality stereoscopic image can be displayed. it can.

[0058]

According to the present invention, not only a multi-viewpoint stereoscopic still image but also a multi-viewpoint stereoscopic moving image can be displayed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of generating binocular parallax in the present invention.

FIG. 2 is a diagram for explaining the principle of generating binocular parallax in the present invention.

FIG. 3 is a diagram for explaining a laser light modulation operation according to the present invention.

FIG. 4 is a diagram for explaining a laser light modulation operation according to the present invention.

FIG. 5 is a diagram showing contents of image data photographed from different viewpoints.

FIG. 6 is a configuration diagram including some blocks showing the first embodiment of the present invention.

FIG. 7 is a partially enlarged view showing a configuration of a first cylindrical lens array in the embodiment.

FIG. 8 is a partial perspective view showing a configuration of a microlens array as another example of the deflecting means.

FIG. 9 is a configuration diagram including a partial block showing a second embodiment of the present invention.

FIG. 10 is a configuration diagram including a partial block illustrating a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 13 ... Semiconductor laser drive circuit (modulation means) 15 ... Semiconductor laser (laser light source) 17 ... Polygon mirror (scanning means in the main scanning direction) 19 ... First cylindrical lens array (deflecting means in the main scanning direction) 21 ... Galvano mirror (Scanning means in the sub-scanning direction) 22... Second cylindrical lens array (diffusion means)

Claims (8)

[Claims] 1. A laser light source for generating a laser beam, scanning means for raster-scanning the laser light from the laser light source in a main scanning direction and a sub-scanning direction, and a laser beam scanned by the scanning means depending on an incident position. A deflecting means for deflecting in the main scanning direction at a deflection angle periodically changing in the main scanning direction, a diffusing means for diffusing the laser light deflected by the deflecting means in the sub scanning direction, and a deflection angle corresponding to the deflecting means. Then, based on data of a plurality of images taken from a plurality of viewpoints or data of a plurality of images synthesized as if taken from a plurality of viewpoints, the plurality of images are projected in respective directions corresponding to the shooting directions. A stereoscopic image display device comprising: a modulation unit that modulates a laser beam. 2. The three-dimensional image display device according to claim 1, wherein the laser light source includes a semiconductor laser, and the modulating means modulates a driving current of the semiconductor laser to modulate the laser light. 3. A laser light source for generating a laser beam, scanning means for raster-scanning the laser light from the laser light source in a main scanning direction and a sub-scanning direction, and a laser beam scanned by the scanning means depending on an incident position. Deflection means for deflecting in the main scanning direction at a deflection angle periodically changing in the main scanning direction; converging means for converging laser light incident on the deflecting means; and laser light deflected by the deflecting means in the sub-scanning direction. A plurality of images taken from a plurality of viewpoints corresponding to the angle of deflection by the deflecting unit, or a plurality of images based on data of a plurality of images synthesized as if taken from a plurality of viewpoints. And a modulating means for modulating the laser light so as to project in each direction corresponding to the photographing direction. 4. The three-dimensional image display device according to claim 1, wherein the deflecting means comprises a cylindrical lens array in which a plurality of cylindrical lenses are arranged in the main scanning direction. 5. The deflecting means comprises a microlens array in which a plurality of lenses are arranged in both a main scanning direction and a subscanning direction, and sets a scanning interval in the subscanning direction to an arrangement interval in the subscanning direction of the microlens array. The three-dimensional image display device according to claim 1, wherein the three-dimensional image display device is matched. 6. A plurality of laser light sources for generating laser light of different wavelengths, a plurality of modulating means for modulating the laser light from each of the laser light sources, and a laser light modulated by each of the modulating means. Laser light combining means for combining with laser light, scanning means for raster-scanning the laser light combined by the combining means in the main scanning direction and sub-scanning direction, and main scanning of the laser light scanned by the scanning means according to the incident position A deflection means for deflecting in the main scanning direction at a deflection angle periodically changing in a direction, and a diffusion means for diffusing the laser light deflected by the deflection means in the sub-scanning direction. Laser light generated by each laser light source in a plurality of images taken from a plurality of viewpoints or a plurality of images synthesized as if taken from a plurality of viewpoints corresponding to the deflection angles by the means A stereoscopic image display device that modulates a laser beam based on data for each of a plurality of color components corresponding to each wavelength so that the plurality of images are projected in respective directions corresponding to the shooting directions thereof. . 7. A laser light source for generating laser light containing a plurality of different wavelength components, a modulating means for modulating the laser light from the laser light source for each wavelength component, and a laser light modulated by the modulating means. Scanning means for raster-scanning in the scanning direction and sub-scanning direction; deflecting means for deflecting laser light scanned by the scanning means in the main scanning direction at a deflection angle periodically changing in the main scanning direction depending on the incident position; And a diffusing unit for diffusing the laser beam deflected by the deflecting unit in the sub-scanning direction. The plurality of images are projected in respective directions corresponding to the shooting directions based on data for a plurality of color components corresponding to the wavelength components of the plurality of images synthesized as if shot. Stereoscopic image display apparatus characterized by modulating the urchin laser beam for each of the wavelength components. 8. A modulator, comprising: a wavelength separator for separating a laser beam from a laser light source into a plurality of laser beams corresponding to wavelength components; and a plurality of modulators for respectively modulating each of the laser beams separated by the wavelength separator. 8. The three-dimensional image display device according to claim 7, comprising a modulator and a synthesizing means for synthesizing a plurality of laser beams modulated by each modulator into one laser beam.