JPH1114937A - Color stereoscopic image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color stereoscopic image display device simple in structure, low in cost and capable of dealing with requires such as high brightness and high resolution in the device using hologram data where parallax information of the vertical direction are abandoned. SOLUTION: In the constitution consisting of a light source, a transmission type color filer 2, a transmission type spatial light modulation part 1 and a diffusion plate screen 3, the color film 2 is constituted to be a holographic filter which diffracts and separates incident lights to respective incident surface areas corresponding to respective pixel electrode column area of Rs, Gs, Bs equivalent to one cycle associated with the vertical direction of the spatial light modulation part 1 en bloc and which linearly converges them on respective pixel electrode columns associated with corresponding colors of the modulation part 1 and the diffusion plate screen 3 is constituted to be holographic screen which makes lights of respective colors which are modulated in the modulation part 1 and which are associated with the Rs, Cs, Bs equivalent to the one cycle to be formed on the plane of the vertical direction as a planar image and also which has an optical function diffusing lights of respective image formation points in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color stereoscopic image display apparatus using hologram data in which parallax information in the vertical direction is abandoned. The present invention relates to an improvement for enabling a simple and inexpensive structure to cope with a demand for a larger size and a wider observation visual field.

[0002]

2. Description of the Related Art As a recent color stereoscopic image reproducing technique, attention has been paid to research and development of a display apparatus that modulates readout light with hologram data and spatially synthesizes the same in order to enable reproduction of a moving image. However, the following method has been proposed and prototyped as the basic configuration of the device.

First, the configuration of the apparatus shown in FIG.
G, B) read light is combined by independent transmission-type spatial light modulators. A white laser beam obtained from a light source (not shown) is converted into a divergent light wavefront without disturbance by a spatial filter combining an objective lens 51 and a pinhole plate 52, and the light is collimated by a collimator lens.
At 53, it is converted into a parallel light beam. Next, the parallel light flux is 2
3 pieces of dichroic mirrors 54, 55 and mirror 56
The readout lights of the R and G colors are separated into the readout lights of the colors.
To 8, the readout light of B color is changed in direction by the mirror 59 and is made incident on the transmission type spatial light modulator 60 for B color. Here, each of the transmissive spatial light modulators 57, 58, and 60 is of a transmissive type, and has a structure in which an active matrix substrate on which a common electrode, a liquid crystal layer, and a pixel electrode are arranged is stacked, Driving signals (Rd, Gd, Bd) and scanning signals applied to the pixel electrodes of the matrix substrate from the electrode driving circuit 61 and the scanning circuit 62
Driven by (Rs, Gs, Bs), the light transmittance of the liquid crystal layer is changed for each pixel. However, the drive signal (Rd, G
d, Bd) correspond to the hologram data, and are created by reading the hologram data transferred / stored in the frame memory 63 to the electrode drive circuit 61 by the control circuit 64, and read each of R, G, and B. Light is the driving signal (Rd, Gd, Bd)
, And becomes spatial light for forming a stereoscopic image for each color. The spatial light of each color after modulation is combined by a combining optical system including the half mirrors 65a and 65b and the condenser lens 66. As a result, a color stereoscopic image corresponding to the hologram data is displayed near the focal point of the condenser lens 66. Is done. When the hologram data is for displaying a moving image, it is natural that the formed three-dimensional image becomes a moving image.

By the way, according to the three-color combining method, the spectral optical system (54 to 56, 59) and the transmission type spatial light modulator (57, 58, 60) are used.
Are three systems, the whole configuration becomes large-scale, and extremely high positional accuracy is required for the alignment of each optical path and the like. In addition, the amount of information of a three-dimensional image is enormous compared to a two-dimensional image, and a frame memory for storing hologram data.
63 requires a large capacity, and in moving image display, the data transfer and processing must be extremely fast.

Therefore, as shown in FIG. 7, an apparatus has been proposed in which a spectral optical system and a transmission type spatial light modulator are combined into one system, and reproduction is performed using hologram data in which vertical parallax information is abandoned. I have. However, in the figure,
The schematic structure of the transmissive spatial light modulator 1 is shown in a sectional view. In this device, the transmission type spatial light modulator 1 has R,
The color pixel electrodes corresponding to G and B are aligned in the horizontal direction, and each pixel electrode row is periodically arranged in the vertical direction in the order of R, G and B. The light that has been processed by the spatial filter and converted into a parallel light beam by the collimator lens 53 is transmitted through a transmission-type holographic color filter 71 in the same manner as in the above-described device.
In the color filter 71, hologram elements are recorded for each horizontal region corresponding to each pixel electrode row of the transmission type spatial light modulator 1, and the hologram elements are R, G , B alone are selectively diffracted and linearly focused on the corresponding pixel electrode rows. Therefore, as shown in FIG. 8 (conceptual diagram showing the optical action in the vertical direction) and FIG. 9 (conceptual view showing the optical action in the horizontal direction), the light incident on the color filter 71 , G, and B, and the respective selection lights are converged only in the vertical direction and condensed linearly along the pixel electrode rows of the corresponding color in the transmissive spatial light modulator 1. Next, the transmissive spatial light modulator 1 modulates the incident light for each pixel based on the hologram data. However, since the data has abandoned the vertical parallax information as described above, FIG. FIG.
As shown in (1), the R, G, and B modulated lights emitted from the transmissive spatial light modulator 1 are three-dimensionally color-combined and imaged in the horizontal direction (see FIG. 9). In the vertical direction, a lenticular lens is used for the transmission type spatial light modulator.
The light is condensed at the position of the lenticular plate 72 provided in a manner corresponding to each of the pixel electrode rows, and is diffused in the vertical direction by each lenticular lens (see FIG. 8). This is because although the amount of hologram data can be greatly reduced by discarding the vertical parallax information, the depth information is presented only in the horizontal direction in the reproduced image, and only planar information is presented in the vertical direction. When the observer looks up or looks down at the reproduced image, blurring due to so-called astigmatism occurs, and the lenticular plate
The problem is solved as much as possible by increasing the viewing angle at 72.

[0006]

As described above, according to the color stereoscopic image display device shown in FIG. 7, the use of the holographic color filter 71 simplifies the optical system, thereby achieving downsizing. By discarding vertical parallax information and greatly reducing the amount of hologram data, the use of the lenticular plate 72 makes it possible to suppress blur due to astigmatism to a range that does not hinder practical use. I have.

However, the color filter used in the device
According to 71, although the light of the corresponding color is linearly focused in each hologram element, the light of the other color is absorbed and thus does not contribute as read light, and as a result, the utilization efficiency of the read light is 1 as a whole. / 3.

When a high resolution is required for the reproduced image, the pixel electrodes of the transmission type spatial light modulator are arranged and configured at a high density, and the hologram elements of the color filter 71 are densely arranged in correspondence with the arrangement. Although they can be recorded, they can be manufactured relatively easily by a semiconductor manufacturing process or a hologram manufacturing process. However, the lens pitch p (see FIG. 8) and the depth resolution number of the lenticular plate 72 can be accurately determined. It is very difficult to manufacture.

Regarding the problem of the diffuser screen, as shown in FIG. 10, the pitch of the lens 81 of the lenticular plate is set so as to include all the R, G, and B incident lights corresponding to one period, and the light is diffused collectively. Although it is possible to make the lens pitch of the lenticular plate small, it is possible to observe as a color image because the diffusion ranges of R, G, and B light are different. Can not do.

Therefore, the present invention provides a color stereoscopic image display device having the basic configuration shown in FIG. 7 in which a color filter and a diffuser screen are devised so that a reproduced image with higher brightness and higher resolution can be obtained with a simpler and less expensive configuration. It was created for the purpose of obtaining it.

[0011]

According to the present invention, there is provided a light source that emits light having at least two wavelengths of emission line spectra, and a wavelength band centered on at least two emission line spectra selected from the light of the light source. The corresponding color pixel electrodes are aligned in the horizontal direction, and the pixel electrode rows of each color are periodically arranged in the vertical direction, and a signal corresponding to hologram data in which the parallax information in the vertical direction is abandoned is applied to each color pixel electrode. A spatial light modulator for driving a light modulating layer, and a spatial light modulator disposed between the light source and the spatial light modulator, diffracting and dispersing incident light from the light source to convert the light of each wavelength band into the spatial light. A transmissive holographic filter that linearly converges each pixel electrode row of a corresponding color in the modulating unit, and modulated light that is formed as a planar image on a vertical plane by the spatial light modulating unit. A diffusion plate screen that transmits modulated light that is diffused in the vertical direction and formed as a three-dimensional image in the horizontal direction, wherein the transmission-type holographic filter is disposed in the spatial light modulator. The light incident on each incident surface region corresponding to the color pixel electrode row region for each period is collectively diffracted and separated, and the separated light of each wavelength band is converted into a pixel electrode of a corresponding color in the spatial light modulator. The diffuser screen is configured as a holographic filter that linearly converges into columns, and the diffuser screen is formed by condensing modulated light of each color obtained from each pixel electrode column in the spatial light modulator in units of each cycle and forming the screen on a vertical plane. A holograph having a first optical function of forming an image as a planar image and a second optical function of vertically diffusing light at each image forming point. Tsu according to the color stereoscopic image display apparatus characterized by being configured as a click screen.

In addition to the first and second optical functions, the diffusing plate screen also has a third optical function of enlarging the viewing angle of a three-dimensional image formed in the horizontal direction. It is effective to have it.

According to the present invention, the light of each color diffracted and divided by the transmission type holographic filter is all light incident on each incident surface area corresponding to the color pixel electrode array area for each cycle in the spatial light modulator. , And the light from the light source is used almost 100%, so that a high-luminance reproduced image can be obtained.

Further, the holographic screen applied to the diffuser screen performs color synthesis and vertical diffusion (expansion of the viewing angle in the vertical direction) by the first and second optical functions. In this case, Diffusion in the vertical direction is performed by the second optical function at the position of the image forming point where the color is synthesized by the first optical function. The diffusion condition of the modulated light of each color by the lenticular plate shown in FIG. As described above, the diffusion range does not differ for each color, and a color reproduction image can be formed normally. And since this diffuser screen is formed of a hologram, it is easy to ensure accuracy and manufacture even when high resolution is required.

In general, in the projection holography of the virtual image reproduction type, as shown in FIG. 11, the width of the hologram for recording the object information is smaller than the smaller one of the visual field width: W or the visual field width: D. Must be big. In the present invention, the spatial light modulator driven based on the hologram data corresponds to the hologram of FIG. 11, but when the visual field width: W of the object increases, the visual field width:
Since D becomes smaller, it is necessary to increase the size of the spatial light modulator in order to obtain a wide observation viewing range. That is, a large amount of data is required to enable an object having a large field of view to be observed in a wide viewing area while securing a fixed resolution in a reproduced image. Therefore, in the present invention, the diffuser screen is combined with the first and second optical functions and the third optical function of expanding the viewing angle of a stereoscopic image formed in the horizontal direction. In this way, it is possible to ensure a large viewing angle while using a small-sized spatial light modulator.

The present invention can be applied irrespective of whether the spatial light modulator is a transmission type or a reflection type. In the case of the transmission type, the transmission type holographic filter, the spatial light modulator, and the diffusion plate are used. The screen is arranged on one axis in a relationship that the substrate is parallel, and the modulated light of each color that has passed through the spatial light modulator is made to enter the diffuser screen, and in the case of the reflection type,
The linearly converged light of each color by the transmission type holographic filter is made to enter the spatial light modulator from an oblique direction, and the modulated light of each color reflected by the spatial light modulator is made to enter the diffuser screen.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a color stereoscopic image display apparatus according to the present invention will be described below in detail with reference to FIGS. 1 to 5 and FIGS. First, FIG. 1 shows a schematic configuration diagram of the device according to the embodiment, (A) is a diagram of the optical system of the device as viewed from the horizontal direction, (B) is a diagram as viewed from the vertical direction,
FIG. 3B is a cross-sectional view showing a schematic structure of the transmissive spatial light modulator 1 along the pixel electrode row of G color. Then, as shown in the figure, the device according to this embodiment includes the arrangement relationship of the optical elements and the transmission type spatial light modulator 1.
7 is similar to the apparatus of FIG. 7 according to the prior art in that the drive system and the drive are performed by hologram data in which vertical parallax information is abandoned. Omitted.

The features of this embodiment include (1) an optical function of a transmission type holographic color filter 2 for diffracting and dispersing a reading light into a transmission type spatial light modulator 1 and (2)
The diffusion plate screen 3 for diffusing the imaging light modulated based on the hologram data in the transmission-type spatial light modulator 1 is formed of a hologram, and has a special optical function in combination. .

The first characteristic, diffraction of the color filter 2
The spectral function will be described with reference to FIG. Color filter 2
, A parallel light beam by the collimator lens 53 is incident, but now, for one period in the vertical direction of the pixel electrode rows 22r, 22g, 22b related to R, G, B of the transmission type spatial light modulator 1,
The horizontal micro hologram element 21 in the color filter 2 corresponding to the pixel electrode rows 22r, 22g, 22b for one cycle
, The hologram element 21 has its entrance surface area (a
The parallel luminous flux incident on the horizontally long band-shaped surface area indicated by bcd) is diffracted and separated at different angles for each wavelength band of each of R, G, and B, and the separated light of each color is transmitted through the transmission-type spatial light modulator 1. Are focused linearly along the centers of the pixel electrode rows 22r, 22g, and 22b for the corresponding colors. The entire color filter 2 is composed of the pixel electrode rows 22r, 22g, 2 for one cycle of the transmission type spatial light modulator 1.
Each of the hologram elements 21 corresponding to 2b is composed of a corresponding one of the pixel electrode rows 22r, 22g, 22 corresponding to each hologram element 21.
Linear focused light of each color (R, G, B) is made incident on b as readout light.

Therefore, according to the color filter 2,
Almost 100%, though slight loss due to diffraction
The readout light of each color can be made incident on the transmission-type spatial light modulator 1 with a light utilization efficiency close to. That is, in the color filter 71 applied in the conventional apparatus, as shown in FIG. 8, each hologram element portion selectively transmits light incident on its incident surface as R, G, B linear focused light. Type spatial light modulator
Since the light was emitted to the one side, the readout light was obtained only with the light use efficiency of 1/3. However, the color filter 2 of this embodiment can obtain the readout light with extremely high efficiency.

The composite optical function of the diffuser screen 3, which is the second feature, will be described with reference to FIGS.
First, FIG. 3 shows the three-color combining function and the vertical diffusion function of the diffuser screen 3 as an equivalent optical system. Conceptually, each cycle in the vertical direction modulated by the transmission type spatial light modulator 1 is shown. Linear focusing lens array 31 that focuses the light of each color only in the vertical direction and forms an image on a horizontal line, and 3 of the adjacent pitch of the microlenses 31a arranged at the focal position of the lens array 31. A lenticular plate 32 provided with a lenticular lens 32a for vertical diffusion at a double pitch. Then, the R, G, and B modulated lights related to the respective periods in the vertical direction are incident on the respective microlenses 31a of the linear focusing lens array 31, and the modulated lights are transmitted to the lenticular plate 32 in the aforementioned cycle unit. Is once focused and imaged on the center line of the corresponding lenticular lens 32a, and is diffused in the vertical direction by the lenticular lens 32a.

Next, FIG. 4 shows the function of expanding the viewing angle of the diffuser screen 3 as an equivalent optical system. The transmissive spatial light modulator 1 modulates incident light based on signals corresponding to hologram data applied to the pixel electrode rows of each color, and forms a three-dimensional reproduced image of the modulated light of each color in the horizontal direction. Let it. In this case, as shown in FIG. 4, the diffuser screen 3 has an optical function equivalent to that of the cylindrical lens 33 as a whole, so that the light focused on the image forming position in the horizontal direction is more than that position. An image is formed at a position on the near side. Therefore, the viewing angle θ1 in the horizontal direction of the reproduced image formed by the transmission type spatial light modulator 1 is the viewing angle θ2 enlarged by the function of the diffusion plate screen 3.
(> Θ1).

As a result, even if the object presented by the hologram data has a large field of view, it can be observed with a large viewing range, and even if the size of the transmissive spatial light modulator is small, the viewing range is widened. Can be secured. In other words, when the observation viewing area is widened while maintaining the same resolution, conventionally, the number of pixels of the transmissive spatial light modulator is increased to increase the size of the transmissive spatial light modulator in the horizontal direction. Although the data amount of the hologram data has increased correspondingly, the use of the diffuser screen 3 makes it possible to widen the observation viewing area without increasing the data amount.

The color filter 2 and the diffusion plate screen 3 are both formed by holograms, but can be realized by making full use of a holographic recording technique using a photopolymer or the like as a photosensitive material. First,
For the color filter 2, the divergence light from the pinhole is used as the reference light, and the object light is a light flux that linearly converges to each of the pixel electrode rows 22r, 22g, and 22b of the transmission-type spatial light modulator 1. It is sufficient to assemble an optical system that causes the divergent reference light and the linear focused light to interfere with each other for each of the R, G, and B wavelengths in units of the element 21, and record the interference fringes.

On the other hand, with respect to the diffusion plate screen 3, interference fringes are recorded by an optical system as shown in FIG. In the figure, 3a is a photosensitive material plate which becomes the diffusion plate screen 3 by recording interference fringes, 45 is a mask plate, 46 is a slit plate, 47 is a cylindrical lens, and a reference light is provided on one side of the photosensitive material plate 3a, On the other side, a cylindrical lens 47
Then, by irradiating the object light obtained by sequentially passing through the slit plate 46 and the mask plate 45, interference fringes are recorded. However, the recording is performed by sequentially selecting the reference light and the object light as R, G, and B, respectively.

Here, the object light is a cylindrical lens
The light is converged only in the horizontal direction at 47, and after passing through the focal point, is diffracted by the slit 46a having a fine width formed in the horizontal direction of the slit plate 46 to be divergent light in the vertical direction. As shown in FIG. 12, the distance between the focal point of the cylindrical lens 47 and the slit plate 46 is set to correspond to the equivalent focal length of the cylindrical lens 33 described in FIG. As shown in FIG. 3, the spread of the divergent light due to each slit 46a corresponds to one period (R, R) in the linear focusing lens array 31 described with reference to FIG.
The distance between the slit plate 46 and the mask plate 45 is set so as to limit the vertical range defined by the G, B) microlenses 31a. Next, in the mask plate 45, slits 45a corresponding to the vertical width of each minute lens 31a in the linear focusing lens array 31 of FIG. 3 are formed at a pitch corresponding to the one cycle, As shown in FIG. 13, the divergent light obtained from the slit plate 46 side is passed through the respective slits 45a to the photosensitive material plate 3a side. In FIGS. 12 and 13, for ease of understanding, it is illustrated as if an interval is present between the mask plate 45 and the photosensitive material plate 3a. However, in actuality, the two plates 45 and 3a are closely attached. Can be Therefore, in the state shown in FIG. 13, the reference light and the object light are converted into R-color light, and the photosensitive material plate 3a
The interference fringes are recorded on the mask plate 45 for one-third period (that is, the slit 45a having a width in the vertical direction of the minute lens 31a).
The reference light and the object light are G-color light and the interference fringes are recorded on the photosensitive material plate 3a while the mask plate 45 is moved vertically in the vertical direction by one-third period. While moving, the reference light and the object light are converted into B color light
By repeating the procedure of recording interference fringes in 3a and moving the mask plate 45 in the vertical direction by one-third period for recording, the above three-color combining function, vertical diffusion function, and viewing area Diffuser screen 3 with angle magnifying function
Can be manufactured with high precision and efficiency.

In the color stereoscopic image display apparatus of this embodiment, as described above, the color filter 2 and the diffuser screen 3
However, since the hologram data is obtained by discarding the parallax information in the vertical direction, the hologram data has a visual field in the horizontal direction as shown in FIGS. 5A and 5B. An image is formed as a three-dimensional reconstructed image 41 on the observation position side from the diffuser screen 3 in a mode in which the angle is enlarged, but in the vertical direction, an image 42 is formed two-dimensionally at the position of the diffuser screen 3. And the light is diffused at each image point. Therefore, as described in the related art, in principle, the image is not formed as a complete stereoscopic image with respect to the vertical movement of the observer's eye, and blur due to astigmatism occurs. The light that enters the pupil of the observer due to the diffusion function of the diffuser screen 3 in the vertical direction and contributes to the perception is only a part (corresponding to the shaded area), and when viewed from the observer, a deep vertical focus Since the depth is obtained, the observer can focus his or her eyes on the image forming position P in the horizontal direction, unless an image having a too large depth is displayed.
In other words, although a kind of visual illusion is used, it is possible to reproduce and display a three-dimensional color stereoscopic image of practically no problem. Further, the advantage that the viewing spatial angle θ2 enlarged in the horizontal direction is obtained, so that the transmission spatial light modulator 1 having a small size can form a large viewing viewing zone is as described above.

In this embodiment, the color filter 2
In the optical system in the subsequent stage, the three-color image is treated and the color stereoscopic image is reproduced and displayed. However, the light in each wavelength band centered on the two-wavelength emission line spectrum. It is also possible to reproduce and display a simulated color stereoscopic image by using (two colors of light), and in principle, light having two or more wavelength bands is sufficient. In this embodiment, the configuration using the transmission-type spatial light modulator 1 has been described. However, the optical principle can be similarly applied to a color stereoscopic image display device using a reflection-type spatial light modulator. Is provided with a color filter and a diffuser screen on the reflection surface side of the reflection type spatial light modulation unit, and the light of each color spectrally and focused by the color filter is transmitted to each pixel electrode row related to the corresponding color of the reflection type spatial light modulation unit. The arrangement is such that the modulated light reflected from each pixel electrode row is made incident on the diffuser screen in an oblique direction.

[0029]

The color stereoscopic image display apparatus of the present invention has the following effects by having the above configuration. The invention according to claim 1 enhances the use efficiency of light of a light source by an optical function provided in a transmission type holographic filter, enables display of a high-brightness reproduced image, and includes a first and a second diffuser screen. By using a holographic screen with two optical functions, high accuracy is ensured and manufacturing is easy even when high resolution is required. It is possible to perceive various color stereoscopic images. According to the second aspect of the present invention, by providing the third optical function to the diffuser screen, it is possible to increase the size of the hologram data without enlarging the size of the transmission-type spatial light modulator under a desired resolution condition. Without increasing),
Ensure that a wide viewing field is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram according to an embodiment of a color stereoscopic image display device of the present invention. Here, (A) corresponds to a diagram of the optical system of the apparatus viewed from the horizontal direction, and (B) corresponds to a diagram of the optical system viewed from the vertical direction.

FIG. 2 is a diagram illustrating a diffraction / spectral function of a color filter.

FIG. 3 is a diagram showing a three-color combining function and a vertical diffusion function of a diffusion plate screen using an equivalent optical system.

FIG. 4 is a diagram illustrating a viewing angle widening function of a diffuser screen using an equivalent optical system.

FIG. 5 is a view showing a reproduced image formed and an observation state of the image.

FIG. 6 is a schematic configuration diagram of a conventional color stereoscopic image display apparatus (a method in which light of each color of R, G, and B is modulated by an independent transmission-type spatial light modulator and combined).

FIG. 7 is a schematic configuration diagram of a conventional color stereoscopic image display device (a system in which a spectral optical system and a transmission type spatial light modulator are integrated into one system).

8 is a conceptual diagram showing an optical action in a vertical direction in the color stereoscopic image display device of FIG.

9 is a conceptual diagram showing an optical action in a horizontal direction in the color stereoscopic image display device of FIG.

FIG. 10 is a diagram illustrating a diffusion state when a lenticular lens that diffuses R, G, and B condensed light for each period is used for the diffusion plate screen in a lump.

FIG. 11 is a diagram showing a relationship among a hologram width, a field width of an object, and a viewing zone width of the object.

FIG. 12 is a diagram showing an optical system for manufacturing a diffuser screen (holographic screen) according to the embodiment.

FIG. 13 is a diagram illustrating a manufacturing state of the diffuser screen according to the embodiment.

[Explanation of symbols]

1,57,58,60… Transmissive spatial light modulator, 2,71… Transmissive holographic color filter, 3,72… Diffusion plate screen,
3a: photosensitive material plate, 21: micro hologram element, 22r, 22g, 22b
... Pixel electrode array, 31 ... Linear focusing lens array, 31a ... Micro lens, 32 ... Lenticular plate, 32a, 81 ... Lenticular lens, 33,47 ... Cylindrical lens, 41 ... Three-dimensional reconstructed image, 42 ... two-dimensional reconstructed image, 45 ... mask plate, 45a,
46a: slit, 46: slit plate, 51: objective lens, 52
... pinhole plate, 53 ... collimator lens, 54, 55 ... dichroic mirror, 56, 59 ... mirror, 61, 61 '... electrode drive circuit, 62, 62' ... scanning circuit, 63, 63 '... frame memory, 6
4,64 ': control circuit, 65a, 65b: half mirror, 66: condenser lens.

Claims (2)

[Claims] 1. A light source that emits light including at least two wavelengths of emission line spectra, and a light source selected from light from the light source.
Color pixel electrodes corresponding to each wavelength band centered on the emission line spectrum of the wavelength or more are aligned in the horizontal direction, and pixel electrode rows of each color are periodically arranged in the vertical direction,
A spatial light modulator that drives a light modulation layer by applying a signal corresponding to hologram data that has abandoned vertical disparity information to each color pixel electrode, and is disposed between the light source and the spatial light modulator, A transmission holographic filter that diffracts and disperses the incident light from the light source and linearly focuses the light of each wavelength band to each pixel electrode row of the corresponding color in the spatial light modulator, and the spatial light modulator. A diffusing plate screen for diffusing modulated light formed as a two-dimensional image on a vertical surface in the vertical direction and transmitting modulated light formed as a three-dimensional image in the horizontal direction. The transmission type holographic filter collectively collects light incident on each incident surface region corresponding to the color pixel electrode array region for each period in the spatial light modulator. And a holographic filter that linearly converges the separated light of each wavelength band to each pixel electrode row of the corresponding color in the spatial light modulator, and forms the diffuser screen by the spatial light modulator. The first optical function of condensing modulated light of each color obtained from each pixel electrode row in the unit in units of each cycle and forming an image as a planar image on a vertical plane, and the light at each image forming point A color stereoscopic image display device comprising a holographic screen having a second optical function of vertically diffusing. 2. A third optical system for expanding a viewing angle of a three-dimensional image formed in a horizontal direction by combining a diffuser screen with the first optical function and the second optical function. The color stereoscopic image display device according to claim 1, wherein the color stereoscopic image display device is configured as a holographic screen having functions.