WO2012144835A2

WO2012144835A2 - Holographic reproduction device and method

Info

Publication number: WO2012144835A2
Application number: PCT/KR2012/003026
Authority: WO
Inventors: 강훈종; 정광모; 서경학; 홍성희
Original assignee: 전자부품연구원
Priority date: 2011-04-19
Filing date: 2012-04-19
Publication date: 2012-10-26
Also published as: WO2012144835A3

Abstract

The present invention relates to a holographic reproduction device and a method, and more specifically, to a holographic reproduction device that can be worn on the head of a user and a holographic reproduction method. To that end, a holographic reproduction device according to the present invention comprises a light separator part for reflecting the light emitted from a light source, and a modulating part for spatially modulating the light reflected from the light separator part and transmitting, through the light separator part, a generated hologram to the eyes of a user.

Description

Holographic playback device and method

The present invention relates to a holographic reproduction apparatus and method, and more particularly to a holographic reproduction apparatus and method that can be worn on the user's head.

Three-dimensional image realization technology that allows you to feel three-dimensional depth and three-dimensional feeling from a planar image is widely applied to the aerospace, arts, and automotive industries, as well as the home appliance and telecommunications industry, as well as the direct related fields such as displays. The technical ripple effect is expected to be more than the current HDTV.

That is, with the development of the digital industry and the image industry, high resolution HDTVs have been developed to satisfy human visual effects, and stereoscopic display devices for displaying 3D stereoscopic images have been developed in various ways.

The most important factor for the human sense of depth and three-dimensionality is binocular disparity due to the gap between the two eyes, but there is also a strong relationship between psychological and memory factors. Based on whether the 3D image information can be provided, it is generally classified into a volumetric (volumetric type), a three-dimensional representation (holographic type), a stereoscopic representation (stereoscopic type).

The volume expression method is a way to feel the perspective of the depth direction due to psychological factors and inhalation effects. The viewing angle is calculated by a 3D computer graphic or an observer who displays perspective, superposition, shadow, contrast, and movement by calculation. It is applied to so-called IMAX movies, which provide a large large screen and cause optical illusions to be sucked into the space.

The three-dimensional representation method known as the most complete stereoscopic image implementation technology can be represented by laser light reproduction holography to white light reproduction holography.

In addition, the stereoscopic expression method is to sense a three-dimensional feeling using physiological factors of both eyes. Specifically, when a plane-related image of parallax information is seen in the left and right of human beings that are about 65 mm apart, the brain merges them. The ability to generate spatial information before and after the display surface and to sense a three-dimensional effect, that is, using stereography. This stereoscopic expression method is called a multi-eye display method, and the spectacle method using the special glasses on the observer's side or the parallax barrier, lenticular or integral on the display surface depending on the actual stereoscopic generating position. It can be divided into a glasses-free method using a lens array of the back.

The integrated image method, which is one of the volume expression methods, recognizes a virtual three-dimensional stereoscopic image even without an actual three-dimensional object by reproducing an optical characteristic identical to the distribution and luminance of light emitted from the actual three-dimensional object.

These methods can be divided into the presence or absence of wearing special glasses when observing three-dimensional stereoscopic image, and when viewing the three-dimensional image, without wearing special glasses, seeing the natural three-dimensional image, do not feel fatigue even if observed for a long time The main goal is to develop a 3D stereoscopic image display method.

As described above, the holographic display is known as one of the ideal stereoscopic image display methods.

Hologram (HOLOGRAM) is a combination of HOLOS, which means the whole of the Greek, and GRAM, which means the message, and is obtained by flattening the information of a visible image (stereoscopic). In other words, two-dimensional information is two-dimensionalized and reproduced again from the two-dimensional information into a three-dimensional image. Holograms use the coherence of light reflected from an object, and the reflected wavefront of the light, including phase and amplitude, appears in three dimensions, recorded on a two-dimensional optical refraction medium. Say it as it is. Holography is a photography that records the interference wave generated by the interference of the object beam and the reference beam reflected from the three-dimensional object. A hologram film using a high particle is used to generate the hologram, and the interference pattern is recorded using monochromatic light.

In general, stereoscopic based 3D stereoscopic display is not suitable for human visual system and causes visual fatigue. In addition, there is a need for a method for outputting an image in a desired size by using a small display.

The problem to be solved by the present invention is to reduce the visual fatigue of the user, to propose a method that can provide a complete three-dimensional stereoscopic image, such as a real object.

Another object of the present invention is to propose a method for providing a holographic reconstructed image having a size that can sense a three-dimensional effect.

Another object of the present invention is to propose a method of supporting a real-time holographic renderer for a holographic display.

To this end, the holographic reproducing apparatus of the present invention includes a light source for emitting a plurality of light parallel to each other, a lens through which light emitted from the light source is transmitted, a beam splitter for refracting the light transmitted from the lens in a predetermined direction, and the beam. It includes a reflective spatial light modulator for reflecting the light received from the separation by modulating the spatial light.

To this end, the holographic reproducing method of the present invention comprises the steps of transmitting a plurality of light parallel to each other through the lens, refracting the light transmitted from the lens in a predetermined direction, the refracted light by the reflective spatial light modulator And modulating and reflecting the spatial light.

On the other hand, the holographic reproducing apparatus according to another embodiment of the present invention, the light separation unit for reflecting the light emitted from the light source; And a modulator configured to transfer the holographic image generated by spatial light modulation of the light reflected by the optical splitter to both eyes of the user through the optical splitter.

The holographic reproducing apparatus according to the present embodiment may further include a mask that blocks and removes the virtual image component and the non-diffraction DC component of the holographic generated in the modulator.

The mask may be provided at a rear end of the lens focusing the light emitted from the modulator and transmitted through the light splitter.

The mask may be provided at a focusing point behind the lens.

The optical splitter, the modulator, and the mask may include a first optical splitter, a first modulator, and a first mask for providing a holographic image in the right eye of the user, and a holographic image in the left eye of the user. And a second optical separator, a second modulator, and a second mask.

The holographic reproduction apparatus according to the present embodiment includes the first optical separation unit, the first modulation unit, the first mask, the second optical separation unit, the second modulation unit, and the second mask. The hiring unit may be further included in the user's head.

The holographic reproducing apparatus according to the present embodiment may further include a half mirror that reflects the emitted light and transmits an image of an object positioned in a direction opposite to the user.

On the other hand, the holographic reproduction method according to another embodiment of the present invention, the step of reflecting the light emitted from the light source in the light separation unit; And transferring the holographic image generated by spatial light modulation of the light reflected by the optical splitter to both eyes of the user through the optical splitter.

The present invention enables a user to simultaneously receive a real image and a virtual image by wearing a binocular holographic playback device, and to accept a large size image by using a small size display. In other words, the user can visually receive a holographic reconstructed image of a size to feel a three-dimensional feeling, and can simultaneously receive a real image and a virtual image by using a half mirror.

1 illustrates an integrated image photographing apparatus for obtaining an integrated image.

2 illustrates an integrated image display device displaying an integrated image.

3 is a block diagram of a holographic reproducing apparatus according to an embodiment of the present invention.

4 illustrates a configuration of a binocular holographic reproduction device according to an embodiment of the present invention.

5 and 6 show the configuration of the binocular holographic playback device according to another embodiment of the present invention,

FIG. 7 illustrates a binocular holographic playback apparatus that simultaneously provides a virtual image and an actual image according to an embodiment of the present invention.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through this embodiment of the present invention.

1 is a side cross-sectional view of an integrated image type 3D image photographing apparatus, and FIG. 2 is a side cross-sectional view of an integrated image type 3D image display apparatus.

As shown in FIG. 1, the integrated image type 3D image photographing apparatus includes a photographing lens array 100 and a photographing panel 120. The photographing lens array 110 includes a plurality of convex lenses arranged in a matrix form, and the photographing panel 120 uses a photographic film in the case of a still image, and a charge-coupled device (CCD) in the case of a video. A plurality of pixels (not shown) are defined.

When the object 100 is disposed in front of the photographing lens array 110 of the integrated image type 3D image photographing apparatus, the object 100 emits a plurality of light rays 100a to the photographing lens array 110 and a plurality of objects. The light ray 100a is collected by the lens array 110 for photographing and recorded in each pixel of the photographing panel 120.

In this case, since the images corresponding to the object 100 viewed from each convex lens of the photographing lens array 110 are recorded in each pixel of the photographing panel 120, the integrated image method 3D image photographing apparatus 130 may use the object 100. This results in image data viewed from various directions in space.

Such image data is displayed on the integrated image type 3D image display device of FIG. 2 and synthesized by a user to realize a 3D image.

As shown in FIG. 2, the integrated image type 3D image display device 230 includes a display panel 220 and a display lens array 210. For the display panel 220, a picture is used for a still image, and a flat display panel (FDP) is used for a video, and a plurality of pixels (not shown) are defined. In addition, the display lens array 210 includes a plurality of convex lenses arranged in a matrix form in the same manner as the photographing lens array.

The display panel 220 displays image data recorded in the integrated image type 3D image photographing apparatus (130 of FIG. 1), so that each pixel of the display panel 220 corresponds to the object 200 viewed from various directions. The image is displayed, and light rays emitted from the plurality of pixels are collected by the convex lens of the display lens array 210.

The light rays 200a generated by the convex lens form a plurality of voxels (volume pixels) in space, and the partial images displayed on the plurality of voxels are integrated at one point and the object at a specific position in space. To form an image 200 corresponding to.

That is, the user feels as if he / she sees an actual object while viewing the image 200 in the space, and the integrated image type 3D image display device 230 displays the same 3D image 200 as the actual object.

3 illustrates a holographic reproducing apparatus according to an embodiment of the present invention. Hereinafter, a holographic reproduction apparatus according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

Referring to FIG. 3, the holographic reproducing apparatus includes a lens 300, a beam splitter 310, and a reflective spatial light modulator 320. Hereinafter, a holographic reproducing apparatus including a lens, a beam splitter, and a reflective spatial light modulator will be described. Of course, it is obvious that other configurations may be included in the holographic reproduction apparatus other than the above-described configuration.

Light emitted from the light source is incident on the lens 300. The light source emits light parallel to each other and enters the lens 300. To this end, the light source may be composed of a plurality of light sources for emitting one light, or may include a light diffusion unit for diffusing one light into a plurality of light.

The lens 300 deflects the incident light at a predetermined angle and transmits the light to the beam splitter 310. The beam splitter 310 provides the light received from the lens to the reflective spatial light modulator 320.

The reflective spatial light modulator 320 reflects the light provided from the beam splitter 310 after spatial light modulation. The light reflected by the reflective spatial light modulator 320 is provided to the user. The user may view the virtual hologram using the light reflected by the reflective spatial light modulator 320. The reflective spatial light modulator 320 may be implemented as one of a liquid crystal dispersion (LCD), a liquid crystal on silicon (LCoS), and a digital micro-mirror display (DMD). DMD is a device that displays images by controlling the reflection of light through the mirror by planting micro mirrors of 16 micron size on the silicon wafer at 1 micron interval. The technology plays a key role in small microchips called mirror-devices. Hundreds of thousands of tiny aluminum mirrors are mounted on the microchip, which switches the existing position to match the video signal. When light emitted from a light source shines through a lens to a miniature mirror, it is the basic principle of DMD that the mirror scans a moving image.

4 illustrates a binocular holographic reproduction device according to an embodiment of the present invention. Hereinafter, the binocular holographic reproduction apparatus will be described in detail with reference to FIG. 4.

Referring to FIG. 4, the binocular holographic reproducing apparatus includes a lens 300-1 for the left eye, a beam splitter 310-1, and a reflective spatial light modulator 320-1. 300-2), a beam splitter 310-2, and a reflective spatial light modulator 320-2. As described above, the binocular holographic reproduction apparatus is divided into a configuration for the left eye and a configuration for the right eye, and the operations performed in each configuration are the same. That is, the configuration for the left eye and the configuration for the right eye perform the operation as described with reference to FIG. 3.

5 shows a holographic reproducing apparatus according to another embodiment of the present invention. Hereinafter, a holographic reproducing apparatus according to another embodiment of the present invention will be described in detail with reference to FIG. 5.

Referring to FIG. 5, the holographic reproducing apparatus 400 includes: 1) a spatial light modulator 410 -R, an optical splitter 420 -R, and lenses 430 for providing a holographic image to a right eye E _R. -R, 450-R, 460-R), mask 440-R and 2) Spatial light modulator 410-L, light splitter 420-L for holographic provision in the left eye E _L And lenses 430-L, 450-L, 460-L, and mask 440-L. Of course, other configurations in addition to the above-described configuration may be further included in the holographic playback device 400.

The light splitters 420 -R and 420 -L reflect light emitted from a light source (not shown) and transmit the reflected light to the spatial light modulators 410 -R and 410 -L.

The spatial light modulators 410 -R and 410 -L generate holograms by spatially modulating the light provided from the optical splitters 420 -R and 420 -L. The spatial light modulators 410 -R and 410 -L may be implemented with a liquid crystal on silicon (LCoS), a digital micro-mirror display (DMD), or the like.

The holograms generated by the spatial light modulators 410-R and 410-L are the lenses 430-R and 430-L, the lenses 450-R and 450-L, and the lenses 460-R and 460-L. And then enter both eyes E _R , E _L. Accordingly, the user can enjoy the holographic.

Meanwhile, in addition to the holographic real image, the holographic virtual image component and the non-diffraction DC component are further generated by the spatial light modulators 410 -R and 410 -L. Masks 440-R, 440-L between lenses 430-R, 430-L and lenses 450-R, 450-L to block and remove holographic virtual image components and non-diffraction DC components. Is installed. Specifically, the masks 440 -R and 440 -L are provided at the rear ends of the lenses 430 -R and 430 -L. More specifically, the masks 440 -R and 440 -L are the lenses 430 -R. (430-L) is preferably provided at the focusing point of the rear end.

In Fig. 6, the holographic virtual image and the non-diffraction DC component are removed by the masks 440-R and 440-L, and the holographic virtual image component and the non-diffraction are removed after the masks 440-R and 440-L. It is shown schematically that the DC component is not transmitted to both eyes E _R and E _L of the user through the lenses 450-R, 450-L and lenses 460-R, 460-L.

The present invention proposes a method of wearing the above-described configuration of Figures 4 and 5 to the user's head. In this way, the user can play the large-scale holographic display using a small display by wearing a binocular holographic reproduction device.

7 illustrates a holographic reproducing apparatus for simultaneously reproducing a virtual object and a real object according to an embodiment of the present invention. Hereinafter, a holographic reproducing apparatus capable of simultaneously reproducing a virtual object and a real object according to an embodiment of the present invention will be described with reference to FIG. 7.

According to FIG. 7, the holographic reproducing apparatus includes the binocular holographic reproducing apparatus and the half mirror 500 shown in FIG. 4 or 5. In addition, although not shown, the holographic reproducing apparatus includes a wearable part that can be worn on the user's head.

Since the configuration and operation of the binocular holographic reproducing apparatus have been described above, a description thereof will be omitted.

The half mirror reflects the light emitted from the reflective spatial light modulator of the binocular holographic reproduction device and transmits it to both eyes of the user. In addition, the half mirror 500 passes the image of the real object located in the opposite direction to the user and transmits the image to both eyes of the user. By performing the above process, the user can visually receive the real object passing through the half mirror and the hologram image reflected from the half mirror at the same time.

For example, if the real object passing through the half mirror is a table and the hologram image reflected from the half mirror is a flower, the user can visually receive the flower image placed on the table.

As described above, the present invention can receive a real image and a virtual image at the same time by wearing a two-person holographic playback device, and can receive a large size image by using a small size display.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. .

Claims

A light separation unit for reflecting light emitted from the light source; And

And a modulator for transmitting the holographic image generated by spatial light modulation of the light reflected by the optical splitter to both eyes of the user through the optical splitter.
The method of claim 1,

And a mask for blocking and removing the virtual image component and the non-diffraction DC component of the holographic generated by the modulator.
The method of claim 2,

The mask is,

And a rear end of the lens focusing the light emitted from the modulator and transmitted through the optical splitter.
The method of claim 3, wherein

The mask is,

And a focusing point at the rear end of the lens.
The method of claim 2,

The optical separation unit, the modulator and the mask,

A first optical splitter, a first modulator, and a first mask for providing holographic in the right eye of the user, and a second optical splitter, a second modulator, and a second mask for providing holographic in the left eye of the user Holographic playback apparatus comprising a.
The method of claim 5,

The first optical splitter, the first modulator, the first mask, the second optical splitter, the second modulator, and the second mask are installed, the employment portion is employed in the user's head; Holographic playback apparatus comprising a.
The method of claim 6,

And a half mirror that reflects the emitted light and transmits an image of an object located in a direction opposite to the user.
Reflecting the light emitted from the light source in the light separator; And

And transmitting the holographic generated by spatial light modulation of the light reflected by the optical separation unit to both eyes of the user through the optical separation unit.