KR20180070154A - Three-dimensional image projection apparatus - Google Patents

Abstract

A spatial image projecting apparatus includes a first display located on a first lateral side of the spatial image projecting apparatus and outputting a front side hologram image, a second display located on a second lateral side of the spatial image projecting apparatus and outputting a rear side hologram image, a first prism array located on the front side of the spatial image projecting apparatus and refracting the beam of the front side hologram image, and a second prism array located on the rear side of the spatial image projecting apparatus and refracting the beam of the rear side hologram image. Accordingly, the present invention can provide different floating hologram images on the front side and the rear side.

Description

{THREE-DIMENSIONAL IMAGE PROJECTION APPARATUS}

The present invention relates to a spatial projection imaging apparatus.

3D stereoscopic image display technology is a technique of reconstructing 3D image by adding certain depth information to 2D image.

Such a three-dimensional image display technology provides a three-dimensional image using the binocular disparity principle of a person. There are two methods of separating left and right images using binocular disparity. The spectacle method includes an anaglyph method, a polarized spectacle method, a shutter spectacle method, and the non-spectacle method may include a lenticular method, a parallax barrier method, an optical plate method, and the like . Here, the polarizing glasses system and the shutter glasses system among the glasses system are the oldest three-dimensional display systems and widely used for stereoscopic movies, 3D TVs, and the like. However, polarized glasses and shutter glasses have the disadvantages of wearing special glasses for stereoscopic images and increasing eye fatigue. Among lenticular glasses, the lenticular and parallax barriers have a disadvantage in that the observation points of viewers are fixed with low luminance and low resolution images, and headaches or dizziness are caused when the viewer continuously observes them.

On the other hand, there are hologram and volumetric three-dimensional display systems as the complete stereoscopic system. This full stereoscopic system realizes stereoscopic stereoscopic images only through expensive laser and precision optical system, and does not provide real time high quality stereoscopic images.

In recent years, methods for implementing a real-time stereoscopic image at a low cost using a half mirror, a concave mirror, a Fresnel lens, a prism array, or the like have been proposed. However, in the method using half mirror, the image is formed as a virtual image, and the physical size of the system is large, and the method using the concave mirror and the Fresnel lens has a problem that the manufacturing cost is high and the viewing angle is narrow.

As a solution to this problem, a method of forming a three-dimensional image in a virtual image in space using a prism array has been proposed recently. In this method, a prism array is provided at the upper end of the front of the display panel, and a stereoscopic image is projected to the rear of the prism array.

In the method using the prism array, the effect of the stereoscopic image can be maximized by using the prism constituting the prism array as the prism angle prism. However, when using the deflection prism, the surrounding background is clogged with the display panel, so that the surrounding background can not be projected separately from the stereoscopic image. In other words, it is impossible to configure the actual background to pass through the stereoscopic image. Also, it is impossible to implement two or more stereoscopic images existing at different depths.

On the other hand, a prism array constituting the prism array may be a symmetrical prism array. In this case, although the actual background image can be projected together with the stereoscopic image, when the hologram image passes through the symmetrical prism array and is directed to the viewer, color dispersion occurs due to the refraction of light. In other words, since the refraction angle is different according to each wavelength band, each hologram image is dispersed and diffused.

In order to solve such a problem, there have been proposed methods of correcting color images output from the display panel by applying color distortion in advance. However, it is impossible to correct chromatic dispersion in this way for real background images.

In this connection, a three-dimensional floating display method and system having a background is disclosed in Patent 10-0901866.

A first display which is located at a first side of the spatial image projection apparatus and outputs a front hologram image, a second display which is located at a second side of the spatial image projection apparatus and outputs a rear hologram image, And a second prism array located on a rear surface of the spatial image projection apparatus and refracting the light rays of the rear surface hologram image, wherein the first prism array and the second prism array, ≪ / RTI >

A first prism array and a second prism array are disposed on a front surface and a rear surface of a spatial image projection apparatus, respectively, thereby providing different floating hologram images on the front surface and the rear surface.

The first prism array and the second prism array are disposed on the front and back surfaces of the spatial image projection apparatus, respectively, so as to correct the chromatic dispersion of the background rays with respect to the background image, and the hologram images corresponding to the hologram images We want to provide stereoscopic images. It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided a spatial image projection apparatus comprising a first display disposed on a first side of a spatial image projection apparatus and configured to output a front hologram image, A second display located at a second side of the image projection apparatus and outputting a rear hologram image, a first prism array positioned at a front side of the spatial image projection apparatus and refracting the light rays of the front side hologram image, And a second prism array positioned on the rear surface of the apparatus for refracting the light rays of the rear surface hologram image.

In one embodiment, the first display comprises a first type of polarizing film, and the second display comprises a second type of polarizing film orthogonal to the first type of polarizing film.

In one embodiment, the first prism array includes a first type of polarizing film, and the second prism array may include a second type of polarizing film orthogonal to the first type of polarizing film.

파장판을 포함할 수 있다.In one embodiment, the first prism array includes a first type of polarizing film and a first type of polarizing film

And may include a wave plate.

파장판과 직교하는 제 2 종의

파장판을 포함할 수 있다.In one embodiment, the second prism array includes a first polarizing film and a second polarizing film,

And a second type of

And may include a wave plate.

파장판을 포함할 수 있다.In one embodiment, the first display includes a second type of polarizing film orthogonal to the first type of polarizing film and a second type of polarizing film orthogonal to the first type of polarizing film.

And may include a wave plate.

파장판과 직교하는 제 2 종의

파장판을 포함할 수 있다.In one embodiment, the second display includes a polarizing film of a second kind orthogonal to the polarizing film of the first polarizing film,

And a second type of

And may include a wave plate.

In one example, the first prism array is capable of refracting rays of a rear background which are incident from behind the spatial image projection apparatus and refracted by the second prism array.

In one example, the second prism array is capable of refracting a light beam of a front background that is incident from the front of the spatial image projection apparatus and refracted by the first prism array.

A spatial image projection apparatus according to a second aspect of the present invention includes a first display for outputting a front hologram image, a second display for outputting a rear hologram image, a first prism array for bending light rays of the front hologram image, And a second prism array for refracting the light rays of the rear surface hologram image, wherein the first prism array includes a floating hologram of the front hologram image and a rear hologram of the rear background of the spatial image projection apparatus, The second prism array may project the floating hologram of the rear hologram image and the floating hologram of the front background of the spatial image projection apparatus into the spatial image projection apparatus.

In one example, the first display, the second display, the first prism array, and the second prism array each include a polarizing film.

In one example, the first display and the first prism array comprise a first type of polarizing film, and the second display and the second prism array comprise a second type of polarizing film orthogonal to the first type of polarizing film And a polarizing film.

파장판을 더 포함할 수 있다.In one example, the first display, the second display, the first prism array, and the second prism array each include

And may further include a wave plate.

In one example, the first prism array and the second prism array comprise a first type of polarizing film, wherein the first display and the second display are of a second type of polarizing film orthogonal to the first type of polarizing film And a polarizing film.

파장판을 포함하고, 상기 제 2 디스플레이 및 상기 제 2 프리즘 어레이는 상기 제 1 종의

파장판과 직교하는 제 2 종의

파장판을 포함할 수 있다.In one example, the first display and the first prism array may include a first type

Wherein the second display and the second prism array comprise a wave plate,

And a second type of

And may include a wave plate.

In one example, the first prism array is capable of refracting rays of a rear background which are incident from behind the spatial image projection apparatus and refracted by the second prism array.

In one example, the second prism array is capable of refracting a light beam of a front background that is incident from the front of the spatial image projection apparatus and refracted by the first prism array.

According to one of the above-mentioned objects of the present invention, there is provided a spatial image projection apparatus comprising: a first display which is disposed on a first side of a spatial image projection apparatus and outputs a front side hologram image; A second prism array disposed on the front surface of the spatial image projection apparatus for refracting the light rays of the front surface hologram image and a second prism array disposed on the rear surface of the spatial image projection apparatus for refracting the light rays of the rear surface hologram image, A second prism array, and a second prism array.

A first prism array and a second prism array are disposed on the front and rear surfaces of the spatial image projection apparatus, respectively, so that different floating hologram images can be provided on the front and back surfaces.

The first prism array and the second prism array are disposed on the front and back surfaces of the spatial image projection apparatus, respectively, so as to correct the chromatic dispersion of the background rays with respect to the background image, and the hologram images corresponding to the hologram images A stereoscopic image can be provided.

1 is a view showing a conventional spatial image projection apparatus.
2 is a diagram illustrating an example of a prism array.
Fig. 3 is a view for explaining a color dispersion problem.
FIG. 4 is a diagram illustrating a spatial image apparatus using a dual-frame array.
5 is a diagram illustrating a spatial image projection apparatus according to an embodiment of the present invention.
6 is a diagram illustrating a problem of reflected noise of a hologram image according to an embodiment of the present invention.
7 is a diagram illustrating a spatial image projection apparatus according to another embodiment of the present invention.
8 is a diagram illustrating a spatial image projection apparatus according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

In this specification, the term " part " includes a unit realized by hardware, a unit realized by software, and a unit realized by using both. Further, one unit may be implemented using two or more hardware, or two or more units may be implemented by one hardware.

In this specification, some of the operations or functions described as being performed by the terminal or the device may be performed in the server connected to the terminal or the device instead. Similarly, some of the operations or functions described as being performed by the server may also be performed on a terminal or device connected to the server.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a conventional spatial image projection apparatus. Referring to FIG. 1, the display 100 may output a hologram image. The first prism array 102 is disposed in front of the display 100 and has a plurality of prisms 110 arranged to refract the incident light.

In this regard, the detailed structure of the first prism array 102 will be described briefly with reference to FIG. Referring to FIG. 2, the first prism array 102 includes a plurality of prisms 110 for refracting a first light beam incident in a first direction and a second light beam incident in a second direction different from the first direction, Are arranged in series.

Each of the plurality of prisms 110 includes an incident surface 116 that is an optical plane on which a light beam is incident, a first facet 112 that is an optical plane that refracts a first light ray incident from a lower portion of the prism 110, A second facet 114 that is an optical plane that refracts a second light beam that is incident on one side of the prism 110 in a different direction, i.e., the top of the prism 110.

At this time, the rays of refraction of the first ray and the second ray may proceed parallel to each other in the view direction of the viewer.

1, a first ray 104 incident on a first prism array 102 in a first direction among rays of a hologram image output from the display 100 is refracted by the first prism array 102 . At this time, the viewer can observe the stereoscopic image 108 projected in the virtual image behind the first prism array 102.

On the other hand, the light rays 106 of the background image incident on the first prism array 102 from the actual space in the second direction are refracted by the first prism array 102 and directed toward the viewer.

In other words, the first ray 104 output from the display 100 is refracted in the first facet 112 of the prism and the background ray 106 is refracted in the second facet 114 of the prism, The image 108 and the actual background image are projected together.

However, when the light rays 104 of the hologram image outputted from the display 100 and the light rays 106 of the background image incident from the real space are refracted through the first prism array 102, chromatic dispersion occurs.

3, when the first light beam 104 outputted from the display 100 is diffracted through the first prism array 102, the light beams having the respective wavelengths (red (R) wavelength, green (G) wavelength and blue The red (R) wavelength, the green (G) wavelength, and the blue (B) wavelength of each pixel of the hologram image are dispersed to different positions, resulting in chromatic dispersion.

In other words, even if a clean image is outputted through the display 100, if it passes through the first prism array 102, a color dispersion problem occurs in which each color is separated by chromatic dispersion and the image is projected onto the space.

4 is a diagram illustrating a spatial image apparatus using a dual prism array. Referring to FIG. 4, the spatial imaging apparatus may include a display 100, a first prism array 102, and a second prism array 400.

The display 100 may output a hologram image in front of the spatial image projection apparatus.

The first prism array 102 is positioned in front of the display 100 and the prism surface of the first prism array 102 (i.e., the surface facing the prism) can be configured to face the front of the spatial image projection apparatus. The first prism array 102 can reflect a plurality of incident light beams toward the view direction of the viewer or the front surface of the first prism array 102 when the light ray 104 of the hologram image outputted from the display 100 is incident have.

3, chromatic dispersion occurs when the light ray 104 of the hologram image output from the display 100 passes through the first prism array 102. In this case,

In order to solve such a problem, the spatial image projection apparatus generates color dispersion data for each pixel by matching position information of each pixel of the original image with position information of red, green, and blue subpixels for each pixel, It is possible to output the hologram image for removing chromatic dispersion by rearranging the subpixels for all the pixels based on the chromatic dispersion data of the pixels of the image.

Here, the chromatic dispersion data of the pixel may be data representing the degree of refraction of the red, blue and blue light rays of each pixel of the original image through the first prism array 102. The chromatic dispersion data of the pixel may include a mapping table of position information of each pixel with respect to the original image and correction position information of sub pixels with respect to red, green, and blue of each pixel. The correction position information of the subpixels with respect to the red, green, and blue of each pixel is obtained by passing the light of each pixel through the first prism array 102 to all the pixels of the original image output from the display 100, It is possible to show the degree of refraction by being dispersed by the light of wavelength and blue wavelength.

The first prism array 102 may refract the ray 104 of the hologram image output from the display 100 to form a stereoscopic image 404 corresponding to the hologram image in the spatial image projection apparatus. Here, the hologram image is a rearranged image based on the chromatic dispersion data of the pixels of the original image output from the display 100, and the hologram image passes through the first prism array 102, May be an image formed by correcting the chromatic dispersion of the image.

The second prism array 400 is disposed on the top of the display 100 and is located behind the first prism array 102. The second prism array 400 may be disposed in a direction opposite to the first prism array 102 to refract a background light incident from behind the spatial image projection apparatus. That is, the prism surface of the second prism array 400 may be configured to face the rear of the spatial image projection apparatus.

The first prism array 102 and the second prism array 400 may refract the background rays 402 incident from behind the spatial image projection apparatus to form a background image in the spatial image projection apparatus.

At this time, since the background light ray 402 is a light ray incident on the real space, it is impossible to correct the chromatic dispersion of the hologram image according to the chromatic dispersion data of the pixel. Therefore, in order to solve the chromatic dispersion problem for the background image, the background light ray 402 that has been refracted through the second prism array 400 is incident on the first prism array (not shown) disposed in the direction opposite to the second prism array 400 102), it is possible to correct chromatic dispersion for the background image.

This is because the first prism array 102 and the second prism array 400 are symmetrically arranged in opposite directions to each other and the vertex angles of the respective prisms are the same. The amount of chromatic dispersion of the array 400 becomes equal so that the chromatic dispersion of the background rays 402 passing through the two prism arrays can be compensated for each other.

5 is a diagram illustrating a spatial image projection apparatus according to an embodiment of the present invention. 5, spatial image projection apparatus 500 may include a first display 502, a second display 504, a first prism array 506, and a second prism array 508.

The first display 502 may output a front hologram image. For example, the first display 502 may output a front-use hologram image for removing chromatic dispersion as described above with reference to FIG.

The first display 502 may be located at a first side (e.g., the right side) of the spatial image projection apparatus 500 and the first display 502 may be disposed at an angle with the first prism array 506.

And the second display 504 can output the rear hologram image. For example, the second display 504 may output the rear surface hologram image for removing chromatic dispersion as described above with reference to FIG.

The second display 504 may be located at a second side (e.g., the left side) of the spatial image projection apparatus 500 and may be disposed at an angle with the second prism array 508.

The first prism array 506 is located on the front surface of the spatial image projection apparatus 500 and may refract light rays of the front hologram image output through the first display 502.

The second prism array 508 is positioned on the rear surface of the spatial image projection apparatus and can refract light rays of the rear surface hologram image output through the second display 504. [

The first prism array 506 and the second prism array 508 may be symmetrically disposed in opposite directions to each other. For example, the prism surface of the first prism array 506 is configured to face forward of the spatial image projection apparatus 500, and the prism surface of the second prism array 508 is configured to face the rear of the spatial image projection apparatus 500 As shown in FIG.

The light rays 510 of the front hologram image outputted from the first display 502 are refracted in the first prism array 506 and directed to the front side. At the same time, the light ray 512 of the back background, which is refracted by the second prism array 508 and is incident from behind the spatial light projection apparatus 500, is refracted again in the first prism array 506, Facing the front.

At this time, the light rays 512 of the back background are refracted in the second prism array 508 and then refracted in the first prism array 506 arranged in the direction opposite to the second prism array 508, The chromatic dispersion for the pixel 512 can be corrected.

The viewer located in front of the spatial image projection apparatus 500 can view the stereoscopic image 518 in which the chromatic dispersion-corrected front hologram image and the chromatic dispersion-corrected rear background are projected together.

The light rays 514 of the rear surface hologram image outputted from the second display 504 are refracted in the second prism array 508 and directed to the rear surface. At the same time, the light beam 516 incident on the front of the spatial image projection apparatus 500 and refracted by the first prism array 506 is refracted by the second prism array 508, Facing the rear.

At this time, the light rays 516 in the front background are refracted in the second prism array 508 arranged in the direction opposite to the first prism array 506 after being refracted in the first prism array 506, The chromatic dispersion for the light source 516 can be corrected.

The viewer located on the rear side of the spatial image projection apparatus 500 can view the stereoscopic image 520 in which the chromatic dispersion-corrected rear hologram image and the chromatic dispersion-corrected front background are projected together.

Accordingly, according to the spatial image projection apparatus 500 according to an embodiment of the present invention, it is possible to provide different stereoscopic images to each viewer located in front and rear. In addition, it is possible to provide a hologram image in which chromatic dispersion is corrected and a stereoscopic image for a background image.

6 is a diagram illustrating a problem of reflected noise of a hologram image according to an embodiment of the present invention. 5 and 6A, the rays 514 of the rear hologram image outputted from the second display 504 are refracted in the second prism array 508 and are directed to the rear.

At this time, a part of the light beam 514 of the rear hologram image may be reflected by the second prism array 508 and may be directed to the first prism array 506. For example, a portion of the light beam 514 of the backside hologram image is directed to the first prism array 506 by the noise rays 600 reflected by the interior or the incidence surface of the second prism array 508 or the like. In addition, a portion of the light ray 514 of the rear hologram image is directed to the first prism array 506 by the noise ray 602 reflected from the prism surface of the second prism array 508.

Accordingly, as shown in FIG. 6 (b), unnecessary noise is visible to viewers located in front of the spatial image projection apparatus 500.

7 is a diagram illustrating a spatial image projection apparatus according to another embodiment of the present invention. 7, spatial image projection apparatus 700 may include a first display 502, a second display 504, a first prism array 506, and a second prism array 508.

The above description with respect to the spatial image projection apparatus 500 shown in Fig. 5 can also be applied to the spatial image projection apparatus 700 shown in Fig. Hereinafter, the same contents as those described in the spatial image projection apparatus 500 shown in FIG. 5 will be omitted for the sake of convenience.

Each of the first display 502, the second display 504, the first prism array 506 and the second prism array 508 includes a polarizing film 704 to solve the above-mentioned problem of noise generation .

The first display 502 can be configured to attach a first type of polarizing film 704. The second display 504 may be configured to attach a polarizing film 704 of a second type orthogonal to the polarizing film 704 of the first type.

The first prism array 506 may be configured such that a first type of polarizing film 704 is attached. The second prism array 508 may be configured such that a second type of polarizing film 704 is attached.

For example, a first type of polarizing film 704 may be attached to the front surface of the display panel 702 of the first display 502. A first type of polarizing film 704 may be attached to the entire surface of the prism surface 706 of the first prism array 506.

For example, the first type of polarizing film 704 may be a parallel polarization (P-pol) film and the second type of polarizing film 704 may be a perpendicular polarization (S-pol) film. have. In the following description, it is assumed that the first polarizing film 704 is a parallel polarizing film and the second polarizing film 704 is a perpendicular polarizing film.

The light rays 708 of the front hologram image outputted from the first display 502 pass through the polarizing film 704 of the first kind of the first display 502 to have a polarization state of P-pol, 1 prism array 506 through the first prism array 506 and the first polarizing film 704 because of the same polarization state as the first polarizing film 704 attached to the spatial image projection apparatus 700 Quot;). ≪ / RTI >

Light rays 710 in the background of the background have no polarization characteristics because they are natural environments in general. The backward background light beam 710 passes through the second prism array 508 and has the S-pol polarization state, which is the first type of polarizing film 704 attached to the first prism array 506, The first prism array 506 and the first kind of polarizing film 704 are blocked without passing through the first prism array 506 and the first type polarizing film 704 because their directions are perpendicular to each other.

The light ray 712 of the rear hologram image outputted from the second display 504 passes through the polarizing film 704 of the second kind of the second display 504 to have the polarization characteristic of S-pol, 2 prism array 508, which passes through the second prism array 508 and the second type of polarizing film 704 to form a spatial image projection To the viewer at the back of the device 700.

On the other hand, a part of the light rays 714 of the light ray 712 of the rear surface hologram image having the S-pol polarization characteristic is reflected by the second prism array 508 and is directed to the first prism array 506. However, a part of the light ray 714 of the light ray 712 of the backside hologram image having the S-pol polarization characteristic is polarized perpendicularly to the polarization direction of the first kind of the polarizing film 704 of the first prism array 506 It is blocked without passing through the first prism array 506 and the first polarizing film 704.

Therefore, the viewer on the front and rear sides of the spatial image projection apparatus 500 can view the stereoscopic image 716 of the front and rear hologram images which can not see the surrounding background image but no noise image.

8 is a diagram illustrating a spatial image projection apparatus according to another embodiment of the present invention. 8, spatial image projection apparatus 800 may include a first display 502, a second display 504, a first prism array 506, and a second prism array 508.

The same contents as those described with respect to the spatial image projection apparatus 500 shown in Fig. 5 can also be applied to the spatial image projection apparatus 800 shown in Fig. Hereinafter, the same elements as those of the spatial image projection apparatus 500 shown in FIG. 5 will be omitted for simplicity.

파장판(802)을 포함할 수 있다.The first prism array 506 includes a first type of polarizing film 704 and a first type of

And may include a wave plate 802.

파장판(802)과 직교하는 제 2 종의

파장판(802)을 포함할 수 있다.The second prism array 508 includes a first type of polarizing film 704 and a first type of

The second type of wave plate 802 orthogonal to the wave plate 802

And may include a wave plate 802.

파장판(802)을 포함할 수 있다.The first display 502 includes a second type of polarizing film 704 that is orthogonal to the first type of polarizing film 704,

And may include a wave plate 802.

파장판(802)과 직교하는 제 2 종의

파장판(802)을 포함할 수 있다.The second display 504 includes a second type of polarizing film 704 that is orthogonal to the first type of polarizing film 704,

The second type of wave plate 802 orthogonal to the wave plate 802

And may include a wave plate 802.

파장판(802)이 부착되도록 구성될 수 있다. 제 1 프리즘 어레이(506)의 프리즘 면(706)의 전면에는 제 1 종의 편광 필름(704)이 부착되고, 프리즘 면(706)의 후면에는 제 1 종의

파장판(802)이 부착되도록 구성될 수 있다.For example, on the front surface of the display panel 702 of the first display 502, a second type of polarizing film 704 and a first type

The wave plate 802 may be configured to be attached. A first type polarizing film 704 is attached to the front surface of the prism surface 706 of the first prism array 506 and a second type polarizing film 704 is attached to the rear surface of the prism surface 706. [

The wave plate 802 may be configured to be attached.

파장판(802)은 광선의 파장의 위상을 45도 회전시키는 특성을 가질 수 있고, 제 2 종의

파장판(802)은 광선의 파장의 위상을 -45도 회전시키는 특성을 가질 수 있다. 이하에서는 제 1 종의 편광 필름(704)은 평행 편광 필름이고, 제 2 종의 편광 필름(704)은 수직 편광 필름인 것으로 가정하여 설명하기로 한다. 또한, 제 1 종의

파장판(802)은 광선의 파장의 위상을 45도 회전시키는 특성을 가지고, 제 2 종의

파장판(802)은 광선의 파장의 위상을 -45도 회전시키는 특성을 가진 것으로 가정하여 설명하기로 한다.For example, the first type of polarizing film 704 may be a parallel polarization (P-pol) film and the second type of polarizing film 704 may be a perpendicular polarization (S-pol) film. have. In addition,

The wave plate 802 may have a property of rotating the phase of the wavelength of the light by 45 degrees, and the second type

The wave plate 802 may have a characteristic of rotating the phase of the wavelength of the light beam by -45 degrees. In the following description, it is assumed that the first polarizing film 704 is a parallel polarizing film and the second polarizing film 704 is a perpendicular polarizing film. In addition,

The wavelength plate 802 has a characteristic of rotating the phase of the wavelength of the light ray by 45 degrees,

Assume that the wavelength plate 802 has a characteristic of rotating the phase of the wavelength of the light beam by -45 degrees.

파장판(802)을 통과해 좌원 편광 성분을 갖게 된다.The light rays 708 of the front hologram image outputted from the first display 502 pass through the polarizing film 704 of the second kind of the first display 502 and have polarization characteristics of S-pol. A ray 708 of the front-use holographic image that has passed through the second type of polarizing film 704 is converted into a ray 708 of the first type of the first display 502

And passes through the wave plate 802 to have a left-handed circular polarization component.

파장판(802)을 통과한 전면용 홀로그램 영상의 광선(708)은 제 1 프리즘 어레이(506)의 제 1 종의

파장판(802) 및 제 1 종의 편광 필름(704)을 순차적으로 통과하게 된다. 수학식 2와 같이 좌원 편광 성분을 가진 전면용 홀로그램 영상의 광선(708)은 제 1 종의

파장판(802)을 통과하여 P-pol의 편광 특성을 갖게 되고, 동일한 편광 성분을 가진 제 1 종의 편광 필름(704)을 통과하게 된다.The first type of first display 502

The light rays 708 of the front-use hologram image that have passed through the wave plate 802 are transmitted through the first prism array 506

The wavelength plate 802 and the first kind of polarizing film 704 sequentially. The ray 708 of the frontal hologram image having the left-handed circular polarization component as shown in Equation (2)

Passes through the wave plate 802 to have the polarization characteristic of P-pol, and passes through the first kind of polarizing film 704 having the same polarization component.

파장판(802)을 통과하여 우원 편광 성분을 가지게 된다. Light rays 710 in the background of the background have no polarization characteristics because they are natural environments in general. The backward background beam 710 passes through the first type of polarizing film 704 of the second prism array 508 to have the polarization component of P-pol. Light rays 710 in the background have a first type

And passes through the wave plate 802 to have a right-handed circular polarization component.

파장판(802)을 통과하여 수학식 3과 같이 P-pol의 편광 성분으로 바뀌게 되고, 이는 동일한 편광 성분을 가진 제 1 종의 편광 필름(704)을 통과하게 된다.The backward ray of light 710 having a right-handed polarization component is directed to the first prism array 506. Light rays 710 in the background are reflected by the first type of first prism array 506

Passes through the wave plate 802 and is converted into a polarization component of P-pol as shown in Equation (3), which passes through the first kind of polarizing film 704 having the same polarization component.

파장판(802)을 통과하여 우원 편광의 성분을 갖게 되고 제 2 프리즘 어레이(508)로 향하게 된다.The light ray 712 of the backside hologram image outputted from the second display 504 passes through the polarizing film 704 of the second type of the second display 504 and the polarization characteristic of the S- . The light rays 712 of the backside hologram image, which have passed through the second type of polarizing film 704,

Passes through the wave plate 802 and has the component of right circularly polarized light and is directed to the second prism array 508. [

파장판(802)을 통해 공간 영상 투영 장치(800)의 내부로 다시 입사된다. 이때, 제 2 종의

파장판(802)을 통과한 후면용 홀로그램 영상의 광선(712)의 일부는 제 2 종의

파장판(802)을 반대의 방향으로 재통과하게 되므로 이때의 제 2 종의

파장판(802)은 광선의 파장의 위상을 45도 회전시키는 특성을 가지게 된다. A portion 714 of the ray 712 of the backside hologram image having the right-handed circular polarization component is incident on the second type of second prism array 508 through surface reflection and internal reflection

And is incident again into the spatial image projection apparatus 800 through the wave plate 802. At this time,

Part of the light ray 712 of the rear surface hologram image that has passed through the wave plate 802 is incident on the second type

The wave plate 802 is re-passed in the opposite direction, so that the second type

The wavelength plate 802 has a characteristic of rotating the phase of the wavelength of the light by 45 degrees.

파장판(802)을 통과하여 좌원 편광 성분을 가지게 되고 제 1 프리즘 어레이(506)로 향하게 된다.A part of the light ray 714 of the light ray 712 of the rear surface hologram image having the P-pol component maintains the polarization state as it is,

Passes through the wave plate 802 to have the left-handed circular polarization component and is directed to the first prism array 506.

A part of the light ray 714 of the light ray 712 of the rear surface hologram image having the left-handed circular polarization component passes through the first kind of wave plate 802 of the first prism array 506, Polarized light component.

Since the first prism array 506 is attached with the first kind of polarizing film 704 having the P-pol polarized light component, a part of the rays 712 of the back light hologram image 712 having the S- 714 are blocked without passing through the first type of polarizing film 704 attached to the first prism array 506.

Therefore, the light ray 714 of the light ray 714 of the backside hologram image reflected by the second prism array 508, that is, the three-dimensional image of the noise, is not projected.

Accordingly, the viewer on the front of the spatial image projection apparatus 800 views only the light rays 708 of the front-use hologram image and the three-dimensional image 716 of the light rays 710 of the back background.

In addition, the viewer at the rear of the spatial image projection apparatus 800 views only the ray 514 of the rear hologram image and the stereoscopic image 520 of the front background ray 516 (refer to FIG. 5).

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

파장판100: Display
102: first prism array
400: second prism array
502: First display
504: Second display
506: First prism array
508: second prism array
704: polarizing film
802:

Wave plate

Claims (17)

A spatial image projection apparatus comprising:
A first display located at a first side of the spatial image projection apparatus and outputting a front hologram image;
A second display located on a second side of the spatial image projection apparatus and outputting a rear hologram image;
A first prism array located on a front surface of the spatial image projection apparatus and refracting a light ray of the front hologram image; And
A second prism array positioned on a rear surface of the spatial image projection apparatus and refracting a light ray of the rear surface hologram image,
Wherein the spatial light modulator comprises a spatial light modulator.
The method according to claim 1,
The first display comprising a first type of polarizing film,
Wherein the second display comprises a second type of polarizing film orthogonal to the first type of polarizing film.
3. The method of claim 2,
Wherein the first prism array comprises a first type of polarizing film,
Wherein the second prism array comprises a second type of polarizing film orthogonal to the first type of polarizing film.
The method according to claim 1,
Wherein the first prism array comprises a first type of polarizing film and a first type of polarizing film

And a wave plate.
5. The method of claim 4,
Wherein the second prism array comprises a first type of polarizing film and a first type of polarizing film

And a second type of

And a wave plate.
6. The method of claim 5,
Wherein the first display comprises a second type of polarizing film orthogonal to the first type of polarizing film and a second type of polarizing film

And a wave plate.
The method according to claim 6,
Wherein the second display comprises a second type of polarizing film orthogonal to the first type of polarizing film and a second type of polarizing film

And a second type of

And a wave plate.
The method according to claim 1,
Wherein the first prism array inclines from the rear of the spatial image projection apparatus and refracts the light rays of the backward background refracted in the second prism array.
The method according to claim 1,
Wherein the second prism array is made incident from the front of the spatial image projection apparatus and refracts the light rays of the front background refracted by the first prism array.
A spatial image projection apparatus comprising:
A first display for outputting a front hologram image;
A second display for outputting a rear hologram image;
A first prism array for refracting light rays of the front hologram image; And
A second prism array for refracting a light ray of the backside hologram image,
Lt; / RTI >
The first prism array projects the floating hologram of the front hologram image and the floating hologram of the rear background of the spatial image projection apparatus into the spatial image projection apparatus,
Wherein the second prism array projects the floating hologram of the backside hologram image and the floating hologram of the front background of the spatial image projection apparatus inside the spatial image projection apparatus.
11. The method of claim 10,
Wherein the first display, the second display, the first prism array, and the second prism array each comprise a polarizing film.
12. The method of claim 11,
Wherein the first display and the first prism array comprise a first type of polarizing film and the second display and the second prism array comprise a second type of polarizing film orthogonal to the first type of polarizing film A spatial image projection device.
12. The method of claim 11,
Wherein each of the first display, the second display, the first prism array, and the second prism array comprises:

And further comprises a wave plate.
14. The method of claim 13,
Wherein the first prism array and the second prism array comprise a first type of polarizing film and the first display and the second display include a second type of polarizing film orthogonal to the first type of polarizing film A spatial image projection device.
14. The method of claim 13,
Wherein the first display and the first prism array comprise a first type

Wherein the second display and the second prism array comprise a wave plate,

And a second type of

And a wave plate.
11. The method of claim 10,
Wherein the first prism array inclines from the rear of the spatial image projection apparatus and refracts the light rays of the backward background refracted in the second prism array.
11. The method of claim 10,
Wherein the second prism array is made incident from the front of the spatial image projection apparatus and refracts the light rays of the front background refracted by the first prism array.

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