JPH07236162A - Twin-lens type holograph displaying/reproducing device and twin-lens display type holography television system - Google Patents

Abstract

PURPOSE:To obtain picture quality equivalent to the case of observing holography reproducing images on the large screen of a liquid crystal display panel using both eyes. CONSTITUTION:A left eye side liquid crystal display panel 34L and a right eye side liquid crystal display panel 34R respectively display a left eye side hologram and a right eye side hologram based upon electric signals sent from the transmitting side respectively through a left eye signal line 21L and a right eye signal line 21R. When the panels 34L, 34R are respectively irradiating with left eye side reproducing light 33L and right eye side reproducing light 33R respectively emitted from a left eye side reproducing laser light source 32L and a right eye side reproducing laser light source 32R, a left eye side reproduced image 31L and a right eye side reproduced image 31R are respectively observed by observer's left and right eyes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional television (stereoscopic television), and more particularly to a holographic television system for displaying a three-dimensional image by holography on the display side.

[0002]

2. Description of the Related Art FIG. 5 shows a holographic television (or holographic video) reported in the following documents.
It is a block diagram of a system.

References: Sato, Michishita, Kobayashi, Higuchi, Katsuma, "
Basic Experiments for Holography Television ”, 1
991 Spring Biennale, 28p-A-14, 3rd Volume,
p. 792 (1991).

In this example, on the transmitting side 4, a two-dimensional or three-dimensional object 45 to be photographed is irradiated with a laser beam 44 from a He-Ne laser 40 via a reflector 41, a half mirror 42 and an ND filter 43. , The object light 47 reflected and diffused from the object to be photographed 45 by the diffusion plate 46, and the laser 4
0 to reflector 41, half mirror 42, reflector 49, N
An interference fringe pattern obtained as a result of interference with the reference light 48 coming through the D filter 50 and the collimator 51, that is, the hologram fringe 52 is imaged by the television image pickup tube or the CCD image pickup element 53 in the transmission system 5, and the video signal 5
Convert to 4. The converted video signal 54 is transmitted to the receiving side 6 via the controller 55. The receiving side 6 displays hologram stripes from the transmitted video signal 54 on the liquid crystal display panel 60 used as a spatial light modulator, and irradiates the reproducing laser light 62 from the He-Ne laser 61 on the hologram stripes. Then, the reproduced image 6 is displayed on the screen 63 in real time.
Get 4.

[0005]

However, the spatial resolution of a hologram using light is generally required to be several hundreds / mm or more, and the same high definition as that of a display liquid crystal panel used in a holographic television is required. Degree is required. However, at present, the total number of pixels of the liquid crystal panel is almost irrelevant to the size of the pixels for various reasons.
It becomes almost constant. Therefore, when the pixel size is reduced for holography, the total number of pixels is constant, so the "screen size" is two digits in length compared to those used for general liquid crystal televisions. Since the area is reduced by about 4 digits, the holography television system, which is said to be an ideal three-dimensional image display system that functions as an eye adjustment function (variable focus feed amount), must be seen with one eye at present. It remains in a non-existent state. Even if a high-definition / large-screen liquid crystal display panel becomes technically possible in the future, due to problems such as yield, there will be a panel that is about the size of one eye and a panel that can cover both eyes. Therefore, even if the size is several times larger, the price is probably several tens of times larger, which may hinder the spread of holographic television.

An object of the present invention is to provide an inexpensive holographic display / reproduction device and a holographic television system capable of obtaining image quality equivalent to that when viewing a holographic reproduced image on a large-screen liquid crystal display panel with both eyes. To do.

[0007]

A holographic display / reproduction device of the present invention comprises a left-eye display / reproduction means and a right-eye display / reproduction means for displaying / reproducing a hologram pattern based on information sent as an electric signal. have.

A holographic television system of the present invention has the holographic display reproducing device.

[0009]

The present invention has hologram pattern display means for the left eye and the right eye, each of which has a screen size enough to cover one eye.

According to an embodiment of claim 2 of the present invention, the left-eye display / reproduction means includes a left-eye liquid crystal display panel for displaying a left-eye reproduction image when the left-eye reproduction light is irradiated, The right-eye display / reproduction means includes a right-eye liquid crystal display panel that displays a right-eye reproduction image when the right-eye reproduction light is irradiated.

According to the third aspect of the present invention, the binocular movement detection device for detecting the movement state of both eyes of the observer and sending the movement information to the transmitting side is a twin-lens holographic display / reproduction device. According to an embodiment of claim 5 of the present invention,
In response to this, based on the movement information of the observer's both eyes sent from the twin-lens holographic display / reproduction device to the transmitting side, the image pickup device group is adjusted to the third order according to the movement of the observer's both eyes. An imaging device group driving device that displaces in the original space is provided. This provides an observation environment similar to that of an observer freely observing a large screen hologram.

On the transmitting side, the object to be photographed is irradiated with laser light to form hologram interference fringes, which is imaged.
It may be transmitted to a twin-lens holographic display / reproduction device, or the transmitting side acquires the three-dimensional position information of the object to be photographed by a three-dimensional measurement method other than holography, and then the transmitting side or the receiving side (holographic display -This may be converted into a hologram pattern in a reproducing device).

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 (a) is a cross-sectional view of a twin-lens holographic display / reproduction device according to a first embodiment of the present invention, FIG. 1 (b).
Is a plan view thereof.

The left-eye liquid crystal display panel 34L and the right-eye liquid crystal display panel 34R each have a left-eye hologram and a right-eye hologram on the basis of electric signals sent from the transmitting side by the left-eye signal line 21L and the right-eye signal line 21R, respectively. Is displayed. Here, the left-eye reproduction laser light source 32L and the left-eye reproduction light 33L emitted from the right-eye reproduction laser light source 32R, to which power is supplied by the power supply line 35,
The reproduction light 33R for the right eye is the liquid crystal display panel 3 for the left eye.
When 4 L and the right-eye liquid crystal display panel 34R are illuminated, the left eye reproduced image 31L is observed by the observer's left eye and the right eye reproduced image 31R is observed by the right eye. In this embodiment, the reproduction laser light sources are prepared for the left eye and the right eye, respectively.
It goes without saying that this may be distributed from one light source. These components are arranged in a housing 36 and fixed to a viewer's head by a support 37.

FIG. 2 is a block diagram of a holographic television system including the holographic display / reproduction device on the receiving side shown in FIG. The transmission side 1 and the reception side 3 are connected via a transmission system 2. On the transmitting side 1, a target object 11 is irradiated with laser light (not shown), and object light (not shown) reflected and diffused from the target object 11 is included.
When the object 11 to be photographed is observed on the spot, the left eye is placed on an interference fringe pattern obtained as a result of interference with a reference light (not shown) directly coming from the laser, that is, a hologram fringe (not shown). The imaging device 12L installed at the deaf position and the imaging device 12R installed at the position where the right eye will be placed respectively pick up images, convert into electrical signals, and send out. In this embodiment, two image pickup devices are installed for easy understanding, but if a sufficiently wide large-screen image pickup device that covers both eyes is used, one image pickup device will be installed. An image signal is picked up by using the image signal around the position where the left eye will be placed when observing the target object 11 for the left eye, and the image signal around the position where the right eye will be placed for the right eye. It may be cut out and sent out.

The transmitted hologram signal is transmitted through the transmission line 21.
It is sent to L and 21R. In the present embodiment, the transmission lines are shown separately for the left eye and the right eye for the sake of clarity, but this does not necessarily mean that a plurality of transmission lines should be prepared, and if the transmission capacity is sufficient. Multiple transmission may be carried out by one transmission path.

On the receiving side 3, as described with reference to FIG. 1, the liquid crystal display panels for the left and right eyes are based on the electric signals sent from the transmitting side 1 by the left-eye signal line 21L and the right-eye signal line 21R. The left eye hologram and the right eye hologram are displayed on 34L and 34R, respectively. Here, the reproduction light 3 emitted from the reproduction laser light sources 32L and 32R
3L and 33R are the liquid crystal display panel 34L for the left eye,
When the right-eye liquid crystal display panel 34R is illuminated, the left-eye reproduced image 31L is on the left eye of the observer, and the right-eye reproduced image 31R is on the right eye.
Are observed respectively.

FIG. 3 is a cross-sectional view of a twin-lens holographic display / reproduction device according to a second embodiment of the present invention, and FIG. 4 is a configuration of a holographic television system having the twin-lens holographic display / reproduction device of FIG. It is a figure.

This embodiment is different from the first embodiment shown in FIGS. 1 and 2 in that the receiving side 3 (binocular holographic display.
A binocular movement detection device 38 for detecting the movement state of the eyes of the observer (three-direction parallel movement and rotational movement about the three axes) is installed in the reproduction device), and both of the observers detected by the detection device 38 are installed. A transmission path 22 for transmitting the eye movement information to the transmitting side 1 is provided, and in the transmitting side 1, the image pickup device group 12 is set to the observer based on the eye movement information of the observer sent from the receiving side 3. The driving device 13 for displacing the three-dimensional space (three-direction parallel movement and rotational movement about the three axes) according to the movement of the binocular positions is provided. This provides an observation environment similar to that when an observer freely observes a large screen hologram.

In the above embodiments, the case where the transmitting side 1 actually irradiates the object to be photographed 11 with laser light to form hologram interference fringes, and the hologram fringes are imaged and transmitted is explained. The computer input is used to generate the input in
the object to be photographed 1 by using a three-dimensional measurement method other than holography
It is also possible to acquire the three-dimensional position information of No. 1 and convert it into a hologram at the transmitting side 1 or the receiving side 3 for display.

[0022]

As described above, the present invention has the following effects. (1) The inventions of claims 1, 2, and 4 are inexpensive because display / playback means (liquid crystal display panel) having a screen size small enough to cover one eye are arranged for the left eye and the right eye, respectively. Since the holographic reproduced image can be viewed with the display parts by both eyes and the image quality equivalent to that of the holographic television in a wide screen area can be obtained, it contributes to the spread and application of the holographic television. (2) According to the inventions of claims 3 and 5, the moving state of both eyes of the observer is detected, and this is sent to the transmitting side, and the transmitting side uses the image pickup device based on the movement information of the both eyes of the observer. Since it is configured to be displaced according to the positions of both eyes, in addition to the above (1), an observation environment similar to that of an observer freely observing a large screen hologram can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view and a plan view of a twin-lens holographic display / reproduction device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a holographic television system including the twin-lens holographic display / reproduction device of FIG.

FIG. 3 is a cross-sectional view of a twin-lens holographic display / reproduction device according to a second embodiment of the present invention.

4 is a configuration diagram of a holographic television system including the twin-lens holographic display / playback device of FIG.

FIG. 5 is a configuration diagram of a conventional example of a holographic television system.

[Explanation of symbols]

 1 Transmission Side 2 Transmission System 3 Reception Side 11 Target Object 12 Imaging Device Group 12L Left Eye Hologram Imaging Device 12R Right Eye Hologram Imaging Device 13 Imaging Device Group Drive Device 21L Left Eye Hologram Signal Transmission Line 21R Right Eye Hologram Signal Transmission Line 22 Binocular movement information transmission path 31L Left eye reproduction image 31R Right eye reproduction image 32L Left eye reproduction laser light source 32R Right eye reproduction laser light source 33L Left eye reproduction light 33R Right eye reproduction light 34L Left eye liquid crystal display panel 34R Right eye liquid crystal display Panel 35 Power supply line for laser light source for reproduction 36 Housing 37 Support tool 38 Binocular movement detection device

Claims (7)

[Claims] 1. A display for the left eye for displaying / reproducing a hologram pattern based on information transmitted as an electric signal.
A twin-lens holographic display / reproduction device having a reproduction means and a display / reproduction means for the right eye. 2. The left-eye display / reproduction means includes a left-eye liquid crystal display panel which displays a left-eye reproduction image when irradiated with left-eye reproduction light, and the right-eye display / reproduction means includes right-eye reproduction. The twin-eye holographic display / reproduction device according to claim 1, further comprising a liquid crystal display panel for the right eye, which displays a reproduced image for the right eye when irradiated with light. 3. The two-eye movement detection device according to claim 1 or 2, further comprising a binocular movement detection device that detects a movement state of both eyes of an observer and sends the detected movement information of both eyes of the observer to a transmission side. Eye-type holographic display / playback device. 4. A twin-lens display holographic television system comprising the twin-lens holographic display / playback device according to claim 1. 5. The binocular holographic display / reproduction device according to claim 3, wherein the movement information of the binocular of the observer sent from the binocular holography display / reproduction device to the transmission side. Based on this, a twin-lens holography television system having an image pickup device group driving device that displaces the image pickup device group in a three-dimensional space in accordance with the movement of both eyes of an observer. 6. The transmitting side irradiates the object to be photographed with a laser beam to form hologram interference fringes, images the hologram fringes, and transmits the images to the twin-lens holographic display / reproduction device.
Or the twin-lens holographic television system according to item 5. 7. The transmitting side obtains three-dimensional position information of the object to be photographed by a three-dimensional measuring method other than holography, and the transmitting side or the twin-lens holographic display / reproduction device converts this into a hologram pattern. The twin-lens holographic television system according to claim 4 or 5.