JPS61144692A - Large screen 3D display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large-screen stereoscopic display device that allows a large-screen image projected on a screen to be viewed as a stereoscopic image.

[Conventional technology]

2. Description of the Related Art Conventionally, as a screen projection type three-dimensional display device, the configurations shown in FIGS. 14 and 15, for example, are known. In FIG. 14, two slide projectors or projectors 41, 42 are provided with filters 43, 44 having different wavelengths (colors) or polarization characteristics, respectively.
44, the left eye image and the right eye image are sent to the screen 4.
5, and filters 43 and 44.
By observing the screen 45 using glasses 46 made of a filter similar to the above, and separating the image for the left eye and the image for the right eye, the image can be viewed as a three-dimensional image.

In addition, in FIG. 15, a projection type cathode ray tube 47 is provided with a wavelength (
The left eye image and the right eye image are projected onto the screen 49 by providing filters 4B with different color or polarization characteristics, or by time division.
Alternatively, a three-dimensional effect can be obtained by observing the screen 49 using an eye SSO using a shank that opens and closes in synchronization with time division, and viewing the left eye image and right eye image separately.

[Problem that the invention seeks to solve]

In the conventional example shown in Fig. 14, it is necessary to create photographic films for the left eye and for the right eye, which requires a lot of time and has the disadvantage that images cannot be displayed in real time. be. In the conventional example shown in FIG. 15, when left and right eye image separation using a shutter is used, flicker becomes large and it is difficult to obtain a good three-dimensional effect. Furthermore, in both the conventional examples shown in FIGS. 14 and 15, when performing image separation for left and right eyes using filters, the loss of light amount due to the filters is large, and when projecting onto a large screen, the screen becomes It had the drawback of being dark.

The present invention aims to improve the above-mentioned conventional drawbacks.

[Means for solving problems]

The large-screen stereoscopic display device of the present invention includes a first laser light source that emits one (1≧1) single-color or different-color laser beam having the same polarization characteristic, and each of the first laser light sources m first optical modulators (m≧1) that intensity-modulate the laser beam emitted from the laser beam according to first display data for either the left or right eye; The optical path of the laser beam is the same n
a first optical path conversion element consisting of (n≧O) mirrors, etc., and four (1≧1) monochromatic or different laser light sources having different polarization characteristics from the first laser light source and each having the same polarization characteristics. a second laser light source that emits colored laser beams; ≧1) and a second optical path conversion element consisting of n mirrors (n≧0) that make the optical path of the laser beam modulated by the second optical modulator the same. , a two-dimensional optical deflector consisting of a rotating polygon mirror or the like that scans and projects the laser beam incident through the first and second optical modulators or the first and second optical path conversion elements onto a screen. It is something that

[Effect]

Since the laser light source has linear polarization characteristics,
Utilizing this polarization characteristic, the image for the left eye and the image for the right eye are simultaneously projected and displayed on the screen using laser beams from laser light sources with different polarization characteristics. By providing multiple screens and using different wavelengths, it is possible to display in color, and by observing the screen using polarized glasses, it is possible to separate the image for the left eye and the image for the right eye, allowing you to see a 3D image. be able to.

〔Example〕

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

FIG. 1 is an explanatory diagram of the first embodiment of the present invention, in which IA,
IB are first and second laser light sources with different polarization characteristics, 2A and 2B are first and second optical modulators, 3A and 3
B is a rotating polygon mirror for main scanning, 4A and 4B are rotating polygon mirrors for sub scanning, 5 is a screen, 6 is polarized glasses, 6A, 6B
are polarized lenses with different polarization characteristics, and j! =1. m
=1. This corresponds to n-〇.

The first laser light source IA has a wavelength of 488 nm, for example.
It is an r-ion laser and has linear polarization characteristics formed by a Brewster window, and the emitted laser beam has an electric field vector vibration plane (a plane that includes the traveling direction of light and the electric field vector).
is horizontal.

The laser light source IB of writing 2 is an Ar ion laser with the same wavelength of 488 nm as the first laser light source IA, and has linear polarization characteristics formed by a Brewster window.
The electric field vector vibration plane of the emitted laser beam is the first
This is a perpendicular direction that is 90° different from the laser beam emitted from the laser light source IA.

The optical modulators 2A and 2B are ultrasonic optical modulators that modulate the intensity of the laser beam according to display data. Also, rotating polygon mirrors 3A and 3B.

4A and 4B constitute a two-dimensional optical deflector, which scans and projects the laser beam intensity-modulated by the optical modulators 2A and 2B onto the screen 5 as shown by the dashed line and the dashed double dotted line. It is.

Therefore, the image for the left eye is displayed by a laser beam with polarization characteristics in the horizontal direction, and the image for the right eye is displayed by a laser beam with polarization characteristics in the vertical direction, and these images are combined and displayed simultaneously on the screen 5. be done.

The size of the screen 5 is 1.2 x 1.2 m, the distance from the main scanning deflection point of the two-dimensional optical deflector to the screen 5 is approximately 3 m, and 30 frames per second (interlace method) are displayed on the screen 5. ) 525X5 per frame
When configured with 25 pixels, the main scanning rotating polygon mirror (rotating polygon mirror 4a) is a 24-sided mirror with a rotation speed of 39375 rpm,
The sub-scanning rotating polygon mirror (rotating polygon mirror 4b) is a 30-sided mirror, with 1
The rotation speed is 20 rpm, and the modulation frequency of the displayed image is approximately 10 MHz.

At this time, the data for the left-eye image and the right-eye image can be created using two TV cameras arranged horizontally at intervals so as to correspond to human eyes. It is also possible to use computer graphics image data that takes binocular parallax into consideration by the processor. Further, it is preferable that the image data modulation timing be performed at unequal clock cycles matching the scanning position of the screen 5 in order to prevent pincushion-shaped screen distortion. Such control can be easily executed with a configuration in which the rotational positions of the rotating polygon mirrors 3A, 3B, 4A, and 4B are detected and arithmetic processing is performed in a processor or the like.

Further, the polarizing lens 6A for the left eye of the polarized glasses 6 is a linear polarizing filter that can transmit light having an electric field vector vibration plane in the horizontal direction, and the polarizing lens 6B for the right eye has an electric field vector vibration plane in the vertical direction. This is a linearly polarized filter that can transmit light, and as a result, the image projected and displayed on the screen 5 can be observed separately into an image for the left eye and an image for the right eye. Since it is possible to observe an image having parallax with respect to the subject, a stereoscopic image can be seen by observing the screen 5 using the polarized glasses 6.

Figure 2 is a block diagram of the main parts of the drive control section, and 11.1
2 is image data for the left eye and image data for the right eye,
They can be left-eye and right-eye TV cameras. Further, the data may be accumulated from image signals captured by a TV camera. Further, computer graphics image data for left eye and right eye may also be used.

Also, 13.14 is a batza memory that can store image data for one screen, 15.16 is a line memory that can store image data for one scanning line, and 17.1
8 indicates the first and second optical modulators 2A and 2B in FIG.
19 is a timing control circuit;
20 is a successive timing control circuit, 21 is a sub-scanning synchronizing signal generating section, and 22 is a main scanning synchronizing signal generating section.

When the left eye and right eye image data 11.12 are from a TV camera, the timing control circuit 19 applies a horizontal synchronization signal and a vertical synchronization signal to the TV camera based on the subscanning synchronization signal from the subscanning synchronization signal generator 21. , image data from each TV camera is applied to a buffer memory 13.14.

Buffer memos IJ13 and IJ14 have a capacity to store image data for one screen, and one scanning line of stored image data is read out and added to line memories 15 and 16.

The image data sequentially read out from the line memory 15.16 is applied to the driver 17.18, and intensity modulation of the laser beams in the optical modulators 2A, 2B is performed according to the image data.

Sub-scanning synchronization signal generation section 21 and main-scanning synchronization signal generation section 2
2 generates a signal synchronized with the rotation of the sub-scanning rotating polygon mirror and the main-scanning rotating polygon mirror of the two-dimensional optical deflector; The synchronization signal for
．． 14 and line memories 15 and 16 are applied. Correction of pincushion distortion, etc. can be performed by controlling the time interval of successive timing signals in the successive timing control circuit 20.

When the left eye and right eye image data 11.12 is a TV camera, the driver 17.18 is controlled according to the image data obtained by the TV camera.
18 is a light modulator 2A.

2B, the intensity of the left eye and right eye laser beams, which have different polarization characteristics, can be modulated and scanned and projected onto the screen 5 using a two-dimensional deflector, so a three-dimensional image can be displayed in real time. is possible.

FIG. 3 is an explanatory diagram of main parts of another embodiment of the present invention, and the first
The same reference numerals as those in the drawings indicate the same parts, and each two-dimensional optical deflector is constructed with one rotating polygon mirror 3 for main scanning and one rotating polygon mirror 4 for sub-scanning. According to this embodiment, the configuration of the two-dimensional optical deflector is simplified and control is also simplified, so that costs can be reduced.

In addition, a rotating polygon mirror 3 for main scanning is connected via optical modulators 2A and 2B.
By selecting the distance between the deflection points on which the laser beam is incident so as to be approximately the same as the distance between the observer's eyes, it becomes possible to observe a 3D image with no distortion at the same magnification.

The polarization characteristics of the laser beams emitted from the laser light sources IA and IB for the left eye and the right eye only need to have different linear polarization directions by 90 degrees, so various combinations can be adopted. In addition, if a 1/4 wavelength plate is provided in the optical path of the linearly polarized laser beam, the linearly polarized light is converted to circularly polarized light, so the laser light source I for the left eye and the right eye can be used.
A and IB are equipped with 1/4 wavelength plates, and their principal axes are set at 45° or -45°, and one side is left-handed circularly polarized light and the other is right-handed circularly polarized light. The eye image and the right eye image can be projected and displayed on the screen 5.

In this case, as the polarized glasses 6, the screen 5 side has a 1/2
The left-eye image and the right-eye image of the left-handed circularly polarized light and the right-handed circularly polarized light projected and displayed on the screen 5 are composed of a linear polarizing plate having a four-wavelength plate arranged thereon.
The 1/4 wavelength plate converts the images into linearly polarized images with different polarization directions by 90°, and the linear polarizer allows the images for the left eye and the image for the right eye to be observed separately. .

When a left-eye image and a right-eye image are projected and displayed on the screen 5 using linearly polarized light, when an observer wearing polarized glasses 6 tilts his head toward the screen 5, the relationship between linearly polarized light characteristics changes. Therefore, crosstalk between the left eye image and the right eye image may occur. On the other hand, when circularly polarized light is used, the image is projected onto the screen 5 using laser beams with different rotational directions, so there is an advantage that it is not affected by the tilt of the viewer's head.

FIG. 4 is an explanatory view of the main part of the third embodiment of the present invention, and is for a case where color display is performed. In the figure, R1 and R2 are red laser light sources, for example, a Kr ion laser with a wavelength of 647.1 nm can be used. Also G1. G2 is a green laser light source, and for example, an Ar ion laser with a wavelength of 514.5 nm can be used. B1 and B2 are blue laser light sources, for example,
A He-Cd laser with a wavelength of 441.6 nm can be used. These first laser light sources R1, Gl.

B1 have the same polarization characteristics, but the second laser light sources R2, G2 . The polarization characteristics are different from those of B2.

Also, 2A1 to 2A3.2B1 to 2B3 are optical modulators, 7A1
~? A3.7B1 to 7B3 are optical path conversion elements made of a guichroic prism or a guichroic mirror to make the optical paths of the laser beams the same, 3 is a rotating polygon mirror for main scanning, and a rotating polygon mirror for sub scanning. Polygon mirrors and the like are omitted from illustration.

In this example, 1w=3. mx3. This is for the case where n=3.

The optical modulators 2A1.2A2.2A3 respectively turn on the laser light source R according to the image data of red R9 green G and blue B for the left eye.
1. Intensity modulation of laser beams from Gl and Bl,
Optical path conversion element? A1.7A2.7A3 makes the optical path the same and makes the light enter the main scanning rotating polygon mirror 3 of the two-dimensional optical deflector. The optical modulator 2B1.2B2.283 also outputs laser light sources R2, G2, . The intensity of the laser beam from B2 is modulated, and the optical path is made the same by optical path conversion elements 7B1, 7B2, 783, and the main scanning rotating polygon mirror 3 of the two-dimensional optical deflector is used.
Inject it into the As a result, the screen displays a color image for the left eye and a color image for the right eye, which have different polarization characteristics, so you can see a color stereoscopic image by observing the screen through polarized glasses. It is something.

In this embodiment, it is also possible to use circularly polarized light with different rotation directions, and as a two-dimensional optical deflector, separate ones for the left eye and right eye can be used as shown in FIG. It is also possible to configure it with a rotating polygon mirror. Further, in the drive control section shown in FIG. 2, line memories and drivers are provided in accordance with image data corresponding to each color.

FIG. 5 is an explanatory diagram of the main parts of the fourth embodiment of the present invention, where the same reference numerals as in FIG.
A laser light source such as an Ar ion laser that emits laser beams of two colors, 8A1.8A2, 8B1.8B2, is an optical path conversion element, and this optical path conversion element 8A1.8Bl has a wavelength separation function. That is, laser light source GB1
．． The two wavelength laser beams from GB2 are separated, and the green beam is made to enter the optical modulators 2A2 and 2B2, and the blue beam is made to enter the optical modulator 2A3.283.

In this example, l1=2. m=3. This is for the case where n=3.

Furthermore, the display of images for the left eye and images for the right eye by scanning projection is performed under the same control as in the above-mentioned embodiment, and this embodiment can display a color stereoscopic image using a small number of laser light sources. There are advantages.

FIG. 6 is an explanatory diagram of the main part of the fifth embodiment of the present invention, in which two laser light sources IAU and LAD with the same polarization characteristics are provided for the left eye in the case of displaying a single-color stereoscopic image. , two laser light sources 1BU and IBD for the right eye having polarization characteristics different from these polarization characteristics are provided, and correspondingly light modulators 2AU, 2AD, 2BU, and 2BD are provided,
Laser beams are incident on both sides of the shared rotating polygon mirror 30 for main scanning, and the reflected light is incident on the upper and lower rotating polygon mirrors 4U and 4D for sub-scanning. In this example, 1w1. This is for the case where m=l and m=0, two sets are provided, and the display is divided.

FIG. 7 is a schematic side view of FIG. 6, in which the laser beams from the laser light sources IAU and IBU are incident on the upper rotating polygon mirror 4U for sub-scanning by the rotating polygon mirror 30 for main scanning;
The upper rotating polygon mirror 4U projects a laser beam onto the upper half S1 of the screen 31, and the laser light source IA
D, the laser beam from the IBD is incident on the lower rotating polygon mirror 4D for sub-scanning, and the laser beam is projected onto the lower half S2 of the screen 31 by this lower rotating polygon mirror 4D. It is.

The screen 31 is divided into an upper half S1 and a lower half S2,
Since the image for the left eye and the image for the right eye can be scanned and projected using laser beams with different polarization characteristics,
It becomes possible to use a low-power laser light source. Furthermore, since the number of rotations of the rotating polygon mirror 30 for main scanning can be halved, there is an advantage that the entire apparatus can be made smaller and consume less power.

In order to perform such split screen display, line memory 15.16 and driver 17.1 are shown in FIG.
8 are provided twice each, and image data for l scanning lines is read out from the buffer memories 13 and 14, corresponding to the upper half and lower half of the screen, respectively, and two pieces of image data are provided for the left eye and two for the right eye. The image data can be read out from each line memory in synchronization with main scanning, and the drivers for driving the optical modulators 2AU, 2AD, 2BU, and 2BD can be controlled according to the image data.

FIG. 8 is a perspective view of the main part of the sixth embodiment of the present invention. The fifth embodiment shown in FIGS. 6 and 7 has a single color display, but this embodiment has a color display. This shows the cases in which this is done. In FIG. 8, R11, R12, G11. G1
2. B11. B12 are the laser light sources R1, G1 . A laser light source corresponding to Bl, R
21°R22, G21. G22. B21. B22 are laser light sources R2, G2, and B of the embodiment shown in FIG. 4, respectively.
Laser light source corresponding to 2, 2AU1 to 2AU3, 2AD
1~2AD3.2BU1~2BU3.2BD1~2BD
3 (some codes omitted) is an optical modulator, ? AU1~7AU
3.7AD1~? AD3.7BU1-7BU3.7BD
1 to 7BD3 (some codes omitted) are optical path conversion elements, 30
is a rotating polygon mirror for main scanning, 4U and 4D are rotating polygon mirrors for sub-scanning, and 31 is a screen.

In this example, l=3. m=3. This corresponds to the case where n=3 and two sets are provided.

Laser light sources R11, G11. The laser beam from the group Bll passes through optical modulators 2AU1 to 2AU3 and optical path changing elements 7AU1 to 7AU3 to a rotating polygon mirror 31 for main scanning.
The reflected light is incident on the rotating polygon mirror 4U for sub-scanning, and the upper half of the left eye image is projected and displayed from the rotating polygon mirror 4U onto the upper half S1 of the screen 31. Further, laser light sources R12, G12. The laser beam from the group B12 is transmitted through the optical modulators 2AD1 to 2AD3 and the optical path conversion element?
AD1~? The reflected light enters the rotating polygon mirror 31 for main scanning via AD3, and the reflected light enters the rotating polygon mirror 4D for sub-scanning, and from this rotating polygon mirror 4D, the left eye image is projected onto the lower half S2 of the screen 31. The lower half is projected.

The same applies to the image for the right eye, and the laser light source R21
, G21. The upper half of the right eye image is projected and displayed on the upper half S1 of the screen 31 by the laser beam from the group of laser light sources R22, G22 . The lower half of the right eye image is projected and displayed on the lower half S2 of the screen 31 by the laser beam from the set B22.

FIG. 9 is an explanatory diagram of a seventh embodiment of the present invention, in which the number of laser light sources in the embodiment shown in FIG. 8 is reduced by applying the embodiment shown in FIG. The same reference numerals as in FIGS. 5 and 8 indicate the same parts. GB11.12 is the same laser light source as GBI in FIG. 5, and GB21.GB22 is the same as the laser light source GBI in FIG. Same laser light source as laser light source GB2, 8AU1.8AU2
．． 8AD1.8AD2.8BU1.8BU2.8BD1
．． 8BD2 is the optical path conversion element 8A1.8A in FIG.
This is an optical path conversion element compatible with 2.8B1.882. In this example, 1 = 2. As m=3, n=3,
This corresponds to the case where two sets are provided.

A laser beam for projecting and displaying the upper half of the image for the left eye and a laser beam for projecting and displaying the upper half of the image for the right eye are incident on the main scanning rotating polygon mirror 30 from both sides. The reflected light is incident on the rotating polygon mirror 4U, from which it is scanned and projected onto the upper half of the screen. Also, a laser beam for projecting and displaying the lower half of the image for the left eye and a laser beam for projecting and displaying the lower half of the image for the right eye are incident from both sides, and the reflected light is incident on the rotating polygon mirror 4D. , is scanned and projected onto the lower half of the screen from this rotating polygon mirror 4D.

FIG. 10 is a perspective view of essential parts of an eighth embodiment of the present invention,
The same reference numerals as in FIG. 6 indicate the same parts, and this is an embodiment in which one rotating polygon mirror 32 for sub-scanning is used. Also 8U, 8
D is an optical path conversion mirror, which is a rotating polygon mirror 3 for main scanning.
This is for making the reflected light from 0 enter the rotating polygon mirror 32 for sub-scanning. In this example, jl=l, mxl
, n=Q, and two sets are provided.

FIG. 11 is a side view of a main part for explaining the action of the optical path converting mirror 80.8D in the embodiment of FIG. , the length S of the upper half Sl and lower half S2 of the screen 31, and the rotating polygon mirror 32 from the optical path conversion mirrors 8U and 8D.
The relationship between the incident angle φ and the incident angle φ is as follows. By selecting this angle φ, the scanning position of each laser beam becomes clear, which facilitates synchronization control.

FIG. 12 is an explanatory diagram of the rotating polygon mirror 32 (or 3) for main scanning used in each embodiment of the present invention, and shows the deflection point DI where the laser beam 33 for the left eye is incident, and the deflection point DI for the right eye. The distance from the deflection point D2 where the laser beam 34 is incident is,
It can be made equal to the distance between the observer's eyes (approximately 65 mm). As a result, the left-eye image and right-eye image projected onto the screen are displayed at the distance between both eyes, allowing a 3D image with no distortion at the same magnification to be observed.

In addition, if no special consideration is given to the starting point of the main scanning of the laser beam for the left eye and the starting point of the main scanning of the laser beam for the right eye on the screen 31, the + in FIG.
8) As shown in (b), the scanning timing for the left eye and the right eye will be shifted. TS is the main scanning period, LD is the image data for the left eye, and RD is the image data for the right eye. shows.

This shift in scanning timing is caused by the difference in the scanning timing between the batza memories 13 and 14 and the line memory 15 in FIG.
．． Therefore, the timing of successive output of 16 is different for the left eye and the right eye, and the control thereof becomes complicated. Therefore, the deflection point D1 of the rotating polygon mirror 32 for main scanning,
The angles ZD and OD2 formed by D2 and the center 0 are set to satisfy the following relationship.

(k-1) (2π/P) +θ< l D 10
D 2<(k+1)(2π/P)−〇 (2) However, P is the number of faces of the rotating polygon mirror 32, θ is the effective deflection angle, and k is 2
is an integer greater than or equal to

That is, α=zDIOD2 ・ ・ ・
・(3)6 x (α/ (2π/P) ) −
k ・ ・ ・ (4), and under the condition that e is 0, the laser beams 33 and 34 are incident on the same position in the rotational direction of the reflective surface of the rotating polygon mirror 32, and the angle of incidence on the reflective surface is When one becomes large, the other becomes small, and the scanning start time within the effective deflection angle θ remains the same.For example, when using a rotating polygon mirror with P=24, the deflection point D I + D 2 If the angle α between the center O and the center O is π/4 (45°), when k=3
) formula becomes 0. Under such conditions, as shown in (C) and ld) of FIG. 13, since the scanning timings for the left eye and the right eye are the same, the batza memory 13.
14 and the line memories 15 and 16 at the same timing, it is possible to control the scanning projection of the left eye image and the right eye image.

From this point of view, assuming η-θ (2π/P), the condition that the opening times of the left-limit image data and the right-eye image data do not overlap with each other in the next main scanning period TS is -( 1-η)<e<1-η (5). If this is rewritten as the relationship 76, op2, it will be as shown in equation (2).

The laser light source in each of the above-described embodiments is not limited to a gas laser, but may be any one having polarization characteristics such as a solid state laser or a semiconductor laser.

〔Effect of the invention〕

As explained above, according to the first invention, the left eye image and the right eye image can be scanned and projected onto the screen by using the polarization characteristics of the laser without using a filter or the like. By using polarized glasses, it is possible to see a three-dimensional image, and the advantage is that it is easy to display images in real time, and it is also easy to display them in color. According to the invention of Biburi 2, since the screen can be divided and scanned and projected, it is easy to project a bright image even on a large screen. Since it is possible to reduce the rotation speed of the polygon mirror,
It also has the advantage of being able to extend its life.

According to the invention of Bunpei 3, it is possible to scan and project the left-eye image and the right-eye image onto the screen at intervals corresponding to the distance between the observer's eyes, which simplifies the configuration of the two-dimensional light deflector. At the same time, there is an advantage that a 3D image at the same magnification and without distortion can be viewed. According to the invention of Literature 4, the relationship between the angle α between the deflection points D1 and Dz of the rotating polygon mirror for main scanning of the two-dimensional optical deflector and the center 0, the number of faces P, and the effective deflection angle θ When the following is satisfied, there is an advantage that the scanning start points for the left eye and the right eye can be made to coincide with each other, thereby making it possible to easily control the successive output of these image data.

According to the invention of Biburi 5, one main scanning rotating polygon mirror 30
Since a two-dimensional optical deflector can be configured with the sub-scanning rotating polygon mirror 32 and one sub-scanning rotating polygon mirror 32, the configuration of the two-dimensional optical deflector can be simplified even when displaying a divided screen. , there is an advantage that an economical display device can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of the first embodiment of the present invention, FIG. 2 is a block diagram of the drive control section of the embodiment of the present invention, and FIGS. 3, 4, and 5 are 6 and 7 are explanatory diagrams and a side view of the main parts of the fifth embodiment of the present invention, and FIG. 8 is an explanatory diagram of the sixth embodiment of the present invention. 9 is an explanatory diagram of the seventh embodiment of the present invention; FIG. 9 is a perspective view of the main part;
11 are a perspective view and a side view of essential parts of the eighth embodiment of the present invention, FIG. 12 is an explanatory diagram of deflection by a rotating polygon mirror for main scanning, and FIG. 13 is an explanation of scanning timing. 14 and 15 are explanatory views of conventional stereoscopic display devices. LA, IAU, IAD, R1, G1. Bl, GBl, R
11, R12, G11. G12. Bll, B12. G.B.
II, GBl2 are laser light sources for the left eye, IB, IBU,
IBD, R2, G2. B2, GB2. R21, R22,
G21. G22. B21, B22. GB21. GB22
are laser light sources for the right eye, 2A, 2B, 2A1 to 2A3.
2B1-2B3. 2AU1-2AU3. 2AD1～
2AD3. 2BU1-2BU3. 2BD1~2BD
3 is a light modulator, 3.3A, 3B, 30 is a rotating polygon mirror for main scanning, 4.4A, 4B, 32 is a rotating polygon mirror for sub-scanning, 5
．． 31 is a screen, 6 is polarized glasses, 7A1 to 7A3.
7B1~7B3.7AU1~7AU3,7AD1~? A
D3,7BU1-7BU3.7BD1-7BD3 are optical path changing elements.

Claims (5)

[Claims] (1) l first laser light sources (l≧1) having the same polarization characteristics, and m laser beams that intensity-modulate the laser beams emitted from each of the first laser light sources according to first display data; (m≧1) and the optical path of the laser beam modulated by the first optical modulator is the same n
(n≧0) first optical path conversion elements; m second optical modulators (m≧1) that modulate the intensity of laser beams emitted from each of the two laser light sources according to second display data; and a laser modulated by the second optical modulators. n second optical path converting elements (n≧0) that make the optical paths of the beams the same; and the first and second optical modulators or the first and second optical path changing elements. A large-screen stereoscopic display device comprising a two-dimensional optical deflector that scans and projects a laser beam onto a screen. (2) l first laser light sources (l≧1) having the same polarization characteristics, and m laser beams that intensity-modulate the laser beams emitted from each of the first laser light sources according to first display data; (m≧1) and the optical path of the laser beam modulated by the first optical modulator is the same n
(n≧0) first optical path conversion elements; one (l≧1) second laser light source having different polarization characteristics and the same polarization characteristics as the first laser light source; m second optical modulators (m≧1) that modulate the intensity of laser beams emitted from each of the two laser light sources according to second display data; and a laser modulated by the second optical modulators. Two sets of n (n≧0) second optical path converting elements that make the optical paths of the beams the same are provided, and the two sets of first and second optical modulators or the first and second optical path converters are provided. 1. A large-screen stereoscopic display device comprising a two-dimensional optical deflector that divides a screen into upper and lower parts and scans and projects onto the screen using laser beams corresponding to each set incident through an element. (3) l first laser light sources (l≧1) having the same polarization characteristics, and m laser beams that intensity-modulate the laser beams emitted from each of the first laser light sources according to the first display data; (m≧1) and the optical path of the laser beam modulated by the first optical modulator is the same n
(n≧0) first optical path conversion elements; m second optical modulators (m≧1) that modulate the intensity of laser beams emitted from each of the two laser light sources according to second display data; and a laser modulated by the second optical modulators. n second optical path converting elements (n≧0) that make the optical paths of the beams the same; and the first and second optical modulators or the first and second optical path changing elements. and a two-dimensional optical deflector that scans and projects a laser beam onto a screen, and the two-dimensional optical deflector scans and projects a laser beam onto a screen, and the two-dimensional optical deflector is configured to transmit light from both sides via the first and second optical modulators or the first and second optical path changing elements. A rotating polygon mirror for main scanning in which the interval between the deflection points on which the laser beam is incident is approximately equal to the distance between the eyes, and a rotating polygon mirror for sub-scanning on which the laser beam reflected by the rotating polygon mirror for main scanning is incident. A large-screen stereoscopic display device characterized by consisting of a polygon mirror. (4) l first laser light sources (l≧1) having the same polarization characteristics, and m laser beams that intensity-modulate the laser beams emitted from each of the first laser light sources according to the first display data; (m≧1) and the optical path of the laser beam modulated by the first optical modulator is the same n
(n≧0) first optical path conversion elements; one (l≧1) second laser light source having different polarization characteristics and the same polarization characteristics as the first laser light source; m second optical modulators (m≧1) that modulate the intensity of laser beams emitted from each of the two laser light sources according to second display data; and a laser modulated by the second optical modulators. n second optical path converting elements (n≧0) that make the optical paths of the beams the same; and the first and second optical modulators or the first and second optical path changing elements. and a two-dimensional optical deflector that scans and projects a laser beam onto a screen, and the two-dimensional optical deflector scans and projects a laser beam onto a screen, and the two-dimensional optical deflector is configured to transmit light from both sides via the first and second optical modulators or the first and second optical path changing elements. A rotating polygon mirror for main scanning in which the interval between the deflection points on which the laser beam is incident is approximately equal to the distance between the eyes, and a rotating polygon mirror for sub-scanning on which the laser beam reflected by the rotating polygon mirror for main scanning is incident. The angle ∠D_ between the center O of the rotating polygon mirror for main scanning and the deflection points D_1, D_2
1OD_2 is the number of surfaces P of the rotating polygon mirror and the effective deflection angle θ
According to the relationship, (k-1)(2π)/P+θ<∠D_1OD_2<(k
1. A large-screen stereoscopic display device characterized by being set to satisfy the inequality: +1)(2π)/P−θ. (5) l first laser light sources (l≧1) having the same polarization characteristics, and m laser beams that intensity-modulate the laser beams emitted from each of the first laser light sources according to the first display data; (m≧1) and the optical path of the laser beam modulated by the first optical modulator is the same n
(n≧0) first optical path conversion elements; m second optical modulators (m≧1) that modulate the intensity of laser beams emitted from each of the two laser light sources according to second display data; and a laser modulated by the second optical modulators. Two sets of n (n≧0) second optical path converting elements that make the optical paths of the beams the same are provided, and the two sets of first and second optical modulators or the first and second optical path converters are provided. The two-dimensional optical deflector is equipped with a two-dimensional optical deflector that scans and projects the screen by dividing the screen into upper and lower sections using laser beams corresponding to each group incident through the element, and the two-dimensional optical deflector is configured to reflect different reflections of the laser beams corresponding to each group. A rotating polygon mirror for main scanning that is incident on the surface, and rotating polygon mirrors for sub-scanning that are arranged on both sides of the rotating polygon mirror for main scanning and that make the laser beam reflected by the rotating polygon mirror incident thereon. A large screen 3D display device characterized by: