JPH0556458A - Moving picture stereoscopic image display device - Google Patents

Abstract

PURPOSE:To recognize visually a stereoscopic image (3-dimension moving picture) through the use of a stereoscopic eyeglasses by recording an interference pattern with a reference light in a form of a hologram, selecting a deflection direction by 90 deg. and reading left and right input pictures alternately. CONSTITUTION:Interlace system display is implemented by CRT-L, R and while one of SLM-L, R is written, the other is erased and LED-L, R are lighted corresponding to the erasure. The write/erasure of the SLM-H is executed for a blanking period of the CRT-L, R and the LED-H is lighted corresponding to the erasure. Furthermore, the write to the SLM-H, that is, the read from the SLM-L, H is controlled by AO-1 and the read from the SLM-H is controlled by AO-2 and the deflection direction of read light from a laser light source 6 to the SLM-H by the FLC-P is switched synchronously with the control. Thus, the optical image is given to the observer alternately to the left and the right through the stereoscopic eyeglasses 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving image stereoscopic image display device, and more particularly, to a device for making stereoscopic images visible by stereoscopic glasses (so-called polarized glasses) whose left and right polarization directions are different by 90 degrees. ..

[0002]

2. Description of the Related Art Conventionally, as a technique in such a field,
A stereoscopic image display device using stereoscopic eyeglasses disclosed in Japanese Patent Laid-Open No. 63-114493 is known. This is to display a moving image sent on a CRT according to a constant sync signal, and
A polarizing plate is placed in front of the RT and the polarization direction is set to 9 by the synchronization signal.
The object is to be observed with stereoscopic glasses by switching 0 °.

[0003]

However, in the above-mentioned conventional technique, the brightness of the display light is limited to the brightness of the CRT, and there is a drawback that it is not easy to enlarge or reduce the display of the image. On the other hand, the technique disclosed in Japanese Patent Laid-Open No. 59-163662 has the drawback that three-dimensional display cannot be performed, and the so-called multiplex hologram requires the observer to move. Further, the lens plate three-dimensional image device requires a fine lens plate such as a lenticular plate.

The present invention has been made in order to solve the drawbacks of the prior art, and an object thereof is to provide a moving image stereoscopic image display device capable of clearly displaying a stereoscopic image which can be enlarged and reduced. ..

[0005]

According to the present invention, a subject is imaged by a pair of image pickup means corresponding to the left and right eyes of an observer, and an optical image based on the imaged input image is reconstructed to obtain a polarization direction. In a moving image stereoscopic image display device configured such that the viewer visually recognizes a moving image stereoscopic image of a subject with stereoscopic eyeglasses that are orthogonal to each other on the left and right sides, input images corresponding to the left and right eyes are displayed as coherent optical images Coherent image display means,
Hologram recording means for generating an interference pattern of the coherent optical image and the reference light and alternately recording and displaying the interference pattern on the spatial light modulating means in correspondence with the left and right input images, and the optics corresponding to the left and right input images. It is characterized in that it comprises read-out means for reading out the image from the spatial light modulating means by making the polarization directions orthogonal to each other alternately, and observing the read-out optical image with stereoscopic glasses.

[0006]

According to the present invention, an input image (for example, a display image of a CRT) corresponding to the left and right eyes is converted into a coherent optical image, and the interference pattern with the reference light is recorded and displayed.
Then, the hologram-recorded interference pattern is alternately read by switching the polarization directions by 90 ° corresponding to the left and right input images, so that a stereoscopic image can be visually recognized by using stereoscopic glasses.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of the first embodiment. The cameras 2L and 2R that capture the subject 1 correspond to the left and right eyes of a human, and this input image is a CRT-display device.
It is displayed by L and CRT-R. This CRT-
The input images of R and L are FL by the imaging lenses 3R and 3L.
C (ferroelectric liquid crystal) -SLM (spatial light modulator) -R, L
Is imaged. The timing of writing and erasing the input image of the SLM-R, L is controlled by a control signal (not shown), and the erasing is performed by turning on the LEDs-R, L which are light sources (light emitting diodes).

An apparatus for displaying a coherent image is constructed by the above construction, and the coherent image is read by the following reading optical system to form an interference pattern. That is, the linearly polarized laser beam from the laser light source 4 is AO
The light enters the SLM-R and L via the polarizer (AO-1), the collimator lens 41, and the half mirrors HM-1 and HM-2. Here, the AO-1 operates in synchronization with the CRT-L and R, so that the SLM-L and R are irradiated with the laser beam only during the blanking period of the CRT-L and R.

By the coherent image having the above-mentioned structure, the FLC
An interference pattern with the reference light is formed on the -SLM-H.
That is, the coherent images read out from the SLM-L and R are adapted to enter the SLM-H via the HM-2 and the analyzer 5, while the linearly polarized laser from the laser light source 4 is made. The beam is split by HM-1 and is incident on the SLM-H as reference light. Writing and erasing in the SLM-H are also controlled by a control signal (not shown), and the erasing is performed by lighting the LED-H.

The interference pattern of the SLM-H having the above structure is read by irradiation of the linearly polarized laser beam from the laser light source 6 and observed by the stereoscopic eyeglasses 7. That is, the irradiation of the linearly polarized laser beam on the SLM-H is controlled to be on / off by the AO-2. A polarization direction switch (FLC-) provided in front of the collimator lens 61.
In P), the polarization plane of the linearly polarized laser beam from the laser light source 6 is switched to a right angle, which enables the stereoscopic image to be visually recognized by the stereoscopic eyeglasses 7 in which the polarization directions differ by 90 ° between the left and right. ..

Next, the operation of the apparatus of the above embodiment will be described with reference to the time chart of FIG.

As shown in FIG. 2, the CRT-L and R display a so-called interlace system, and one frame is composed of two fields. And SLM-
L and R erase (E) the other while writing (W) one
It is designed to perform the LED
-L and R are lit.

On the other hand, the writing (W) and the erasing (E) of the SLM-H are executed during the blanking period of the CRT-L and R, and the LED-H is turned on corresponding to the erasing. In addition, writing (W) to this SLM-H, that is, SLM
The reading from -L and H is controlled by AO-1, and the reading from SLM-H is controlled by AO-2. In synchronization with this, the reading light from the laser light source 6 to the SLM-H by FLC-P is synchronized. The polarization direction of the (linearly polarized laser beam) is switched. For this reason, an optical image is alternately given to the viewer via the stereoscopic eyeglasses 7 on the left and right sides.

The operation will be described in detail below by following the flow of time.

First, in the first field of the first frame, the left and right input images are displayed on the CRT-L and R, which are input to the SLM-L and R. Here, since the LED-R is turned on, the coherent image is formed only on the SLM-L.

In the blanking period, the LED-H is turned on and the SLM-H is erased, then the AO-1 is turned on, and the linearly polarized laser beam is emitted from the laser light source 4 to the SLM-.
The L and R are irradiated. At this time, the coherent image is SLM-L.
It is written to the SLM-L as it is held only in SLM-L. At the same time, since the reference light is incident on the SLM-H from the laser light source 4 via the HM-1, an interference pattern corresponding to the human left eye is formed on the SLM-H.

Next, in the second field, AO-2
Is turned on, the linearly polarized laser beam from the laser light source 6 is incident on the SLM-H as readout light, and the output light is incident on the stereoscopic eyeglasses 7. At this time, since the polarization direction is set to pass through the left side of the stereoscopic eyeglasses 7 by the FLC-P, only the input image on the left side is input to the left eye of the observer. At the same time, writing to the SLM-R is performed in the second field, and the SLM-R is written.
With respect to L, the input image in the first field is erased by turning on the LED-L.

After that, when entering the blanking period, the left and right are reversed and the above operation is repeated. That is, SLM-
An interference pattern corresponding to the human right eye is formed in H,
When the next second frame is entered, the right eye image (second field image of the first frame) is read from the SLM-H. At this time, since the polarization direction of the linearly polarized laser beam for reading is switched by the FLC-P, only the input image on the right side is input to the right eye of the observer.

By the above operation, as shown in FIG.
The image of the subject 1 is observed three-dimensionally like a hologram. Since the image of the subject 1 is observed separately for the right eye and the left eye at the television signal rate, this is a three-dimensional moving image. This moving image can be transmitted, and if a screen (not shown) is placed at the position of the real image in FIG. 3, it can be observed with reflected light like a normal movie.

Next, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 4 is a block diagram thereof. The difference from the first embodiment is that one CRT displaying an input image (CRT-
LR), and the number of SLMs displaying a coherent image is also one (SLM-LR). A left / right signal switch 9 is provided to switch the image signals from the cameras 2L and R and send them to the CRT-LR.

FIG. 5 is a timing chart showing the operation. In the CRT-LR, interlaced display is performed. In the first field, the input image by the right-eye camera 2R is displayed, and in the second field, the input image by the left-eye camera 2L is displayed. According to this embodiment, the structure can be simplified.

When displaying in color,
The system may be configured for each color of R, G and B.

[0025]

As described above in detail, according to the present invention, an input image (for example, a display image of CRT) corresponding to the left and right eyes is converted into a coherent optical image, and an interference pattern with the reference light is obtained. Recorded and displayed. Then, the interference pattern recorded on the hologram is read out alternately by switching the polarization direction by 90 ° corresponding to the left and right input images, so that a stereoscopic image can be visually recognized by using stereoscopic glasses. Therefore, it is possible to display a stereoscopic image which has a simple structure and can be easily transmitted. Also, an image like a three-dimensional hologram can be obtained, and screen display is possible. The device of the present invention is strong against partial defects and dust,
It is also characterized by high noise resistance.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a moving image stereoscopic image display device according to a first embodiment.

FIG. 2 is a time chart showing the operation.

FIG. 3 is a perspective view showing its operation.

FIG. 4 is a configuration diagram of a moving image stereoscopic image display device according to a second embodiment.

FIG. 5 is a time chart showing the operation.

[Explanation of symbols]

1 ... Subject 2L ... Camera for left eye 2R ... Camera for right eye CRT-L ... Input image display device for left eye CRT-R ... Input image display device for right eye CRT-LR ... Input image display device for left and right eyes SLM -L ... FLC for coherent image recording and display for left eye-
SLM SLM-R ... FLC-for coherent image recording and display for right eye
SLM SLM-LR ... FLC-SLM 4 ... Laser light source 5 ... Analyzer SLM-H ... Interference pattern FLC-P ... Polarization direction switch AO-1, 2 ... AO Polarizer 7 ... Stereoscopic glasses 9 ... Left and right signal switch

Claims (3)

[Claims] 1. A stereoscopic view in which polarization directions are orthogonal to each other by capturing an image of a subject with a pair of image capturing means corresponding to the left and right eyes of an observer and reconstructing an optical image based on the captured input image. In a moving image stereoscopic image display device configured to allow the observer to visually recognize a moving image stereoscopic image of the subject with eyeglasses, a coherent image display means for displaying the input images corresponding to the left and right eyes as a coherent optical image. A hologram recording means for generating an interference pattern of the coherent optical image and a reference light and alternately recording and displaying the interference pattern on the spatial light modulating means corresponding to the left and right input images; and the left and right input images. Read-out means for reading an optical image corresponding to the above from the spatial light modulating means by making the polarization directions orthogonal to each other alternately, and the read-out optical image is observed by the stereoscopic eyeglasses. Moving stereoscopic image display device comprising. 2. The moving image stereoscopic image display apparatus according to claim 1, wherein the coherent image display means and the spatial light modulation means are configured to hold a recorded image for a predetermined period of time and to erase the recorded image after reading. .. 3. The moving image stereoscopic image display apparatus according to claim 1, wherein the coherent image display means and the spatial light modulation means have a spatial light modulation tube including a ferroelectric liquid crystal.