KR102172408B1 - Three-dimensional image projection apparatus - Google Patents

Abstract

The spatial image projection device is a first display located on a first side of the spatial image projection device and outputting a front holographic image, and a second display located on a second side of the spatial image projection device and outputting a rear holographic image , A first prism array positioned in front of the spatial image projection device and refracting the light rays of the front holographic image, and a second prism array positioned in the rear surface of the spatial image projection device and refracting the light rays of the rear holographic image Includes.

Description

Spatial image projection device {THREE-DIMENSIONAL IMAGE PROJECTION APPARATUS}

The present invention relates to a spatial image projection apparatus.

The 3D stereoscopic image display technology is a technology for reconstructing a 3D image by adding constant depth information to a 2D image.

This 3D 3D image display technology provides 3D images using the principle of binocular disparity of a person. Methods for separating left and right images using binocular parallax include a glasses method and a glasses-free method. The glasses method includes an anaglyph method, a polarized glasses method, a shutter glasses method, and the like, and the glasses-free method may include a lenticular method, a parallax barrier method, and an optical plate method. . Here, among the glasses methods, the polarized glasses method and the shutter glasses method are the oldest 3D display methods and are widely used in stereoscopic movies and 3D TVs. However, the polarized glasses method and the shutter glasses method have a problem of increasing the discomfort and eye fatigue of wearing special glasses for 3D images. Among the glasses-free methods, the lenticular method and the parallax barrier method are low luminance and low-resolution images, and the viewer's observation point is fixed, and has a disadvantage of causing headache or dizziness when the viewer continuously observes.

On the other hand, there are a hologram and a volumetric 3D display method as a full stereoscopic method. In such a full stereoscopic method, only a stereoscopic image in a still state is realized through an expensive laser and a precise optical device, and a real-time high-quality stereoscopic image is not provided.

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

As a solution to this, recently, a method of forming a 3D image as a virtual image in space using a prism array has been proposed. In this method, a prism array is installed on the top of the front of the display panel, and a stereoscopic image is projected on the rear of the prism array.

In such a method of using a prism array, the effect of a stereoscopic image can be maximized by using a declining prism as a prism constituting the prism array. However, when a declination prism is used, there is a problem in that the surrounding background cannot be projected separately from the stereoscopic image because the actual surrounding background is blocked by the display panel. In other words, it is impossible to configure the actual background to be seen through the 3D image. In addition, it is impossible to implement two or more stereoscopic images that exist at different depths.

Meanwhile, a symmetrical prism array may be used as the prism constituting the prism array. In this case, the actual background image can be projected together with the stereoscopic image, but there is a problem in that color dispersion occurs due to the refraction of light when the holographic image passes through the symmetrical prism array and is directed to the viewer. In other words, since there is a difference in the angle of refraction according to each wavelength band, each color of the hologram image is scattered and appears bleeding.

In order to solve this problem, methods for correcting by giving color distortion to an image output from a display panel in advance have been proposed. However, it is impossible to correct color dispersion in this way for an actual background image.

In this regard, Patent Registration 10-0901866 discloses a three-dimensional floating display method and system having a background.

A first display located on the first side of the spatial image projection device and outputting a front holographic image, a second display located on the second side of the spatial image projection device and outputting a rear holographic image, the front of the spatial image projection device A spatial image projection apparatus comprising a first prism array located at and refracting a light beam of a front holographic image, and a second prism array disposed at a rear surface of the spatial image projection device and refracting a light beam of the rear holographic image Want to provide.

A first prism array and a second prism array are arranged and configured on the front and rear surfaces of the spatial image projection apparatus, respectively, thereby providing different floating holographic images from the front and rear surfaces.

In addition, by arranging and configuring a first prism array and a second prism array on the front and rear surfaces of the spatial image projection apparatus, respectively, the color dispersion of the background light rays is corrected for the background image and corresponds to the holographic image in harmony with the background image. We want to provide a three-dimensional image. However, the technical problem to be achieved by the present embodiment is not limited to the technical problems as described above, and other technical problems may exist.

As a technical means for achieving the above-described technical problem, the spatial image projection apparatus according to the first aspect of the present invention includes a first display positioned on a first side of the spatial image projection apparatus and outputting a front holographic image, and the space A second display located on the second side of the image projection device and outputting a rear holographic image, a first prism array located on the front side of the spatial image projection device and refracting light rays of the front holographic image, and the spatial image projection It may include a second prism array located on the rear surface of the device and refracting the light rays of the rear holographic image.

In one example, the first display may include a first type of polarizing film, and the second display may include a second type of polarizing film orthogonal to the first type of polarizing film.

In one example, the first prism array may include 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 example, the first prism array is a first type of polarizing film and a first type of

It may include a wave plate.

파장판과 직교하는 제 2 종의

파장판을 포함할 수 있다.In one example, the second prism array is a first type of polarizing film and the first type of

Of the second kind orthogonal to the wave plate

It may include a wave plate.

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

It may include a wave plate.

파장판과 직교하는 제 2 종의

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

Of the second kind orthogonal to the wave plate

It may include a wave plate.

In an example, the first prism array may rerefract a light beam of a rear background that is incident from the rear of the spatial image projection apparatus and refracted by the second prism array.

In one example, the second prism array may rerefract 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 outputting a front holographic image, a second display outputting a rear holographic image, a first prism array refracting light rays of the front holographic image, and And a second prism array refracting the light rays of the rear holographic image, the first prism array projecting a floating hologram of the front holographic image inside the spatial image projection device, and the second prism array A floating hologram of the rear holographic image may be projected into the spatial image projection apparatus. The first prism array and the second prism array refract rays of a rear background incident from the rear of the spatial image projection apparatus to form the rays of the rear background in the spatial image projection apparatus, and the first prism array and The second prism array may refract a light beam of a front background incident from a front of the spatial image projection device to form a light beam of the front background in the spatial image projection device.

The spatial image projection apparatus according to claim, wherein each of the first display, the second display, the first prism array, and the second prism array includes a polarizing film.

delete

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

It may further include a wave plate.

In one example, the first prism array and the second prism array include a first type of polarizing film, and the first display and the second display are of a second type orthogonal to the first type of polarizing film. It may include 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 are of the first type

Including a wave plate, the second display and the second prism array is the first type

Of the second kind orthogonal to the wave plate

It may include a wave plate.

In an example, the first prism array may rerefract a light beam of a rear background that is incident from the rear of the spatial image projection apparatus and refracted by the second prism array.

In one example, the second prism array may rerefract 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 any one of the above-described problem solving means of the present invention, a first display located on a first side of the spatial image projection device and outputting a front holographic image, a second side of the spatial image projection device, and a rear hologram A second display that outputs an image, a first prism array that is located in front of the spatial image projection device and refracts a light beam of a front holographic image, and a first prism array that is located on a rear surface of the spatial image projection device and refracts the light rays of the rear holographic image It is possible to provide a spatial image projection apparatus including a second prism array.

By disposing and configuring the first prism array and the second prism array on the front and rear surfaces of the spatial image projection apparatus, it is possible to provide different floating holographic images from the front and rear surfaces.

In addition, by arranging and configuring a first prism array and a second prism array on the front and rear surfaces of the spatial image projection apparatus, respectively, the color dispersion of the background light rays is corrected for the background image and corresponds to the holographic image in harmony with the background image. It can provide a stereoscopic image.

1 is a diagram showing a conventional spatial image projection apparatus.
2 is a diagram illustrating an exemplary prism array.
3 is a diagram for explaining a color dispersion problem.
4 is a diagram showing a spatial imaging device using a double fresme 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 reflection noise problem of a holographic image according to an embodiment of the present invention.
7 is a diagram illustrating a spatial image projection apparatus according to another exemplary 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 so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element interposed therebetween. . In addition, when a part "includes" a certain component, it means that other components may be further included, and one or more other features, not excluding other components, unless specifically stated to the contrary. It is to be understood that it does not preclude the presence or addition of any number, step, action, component, part, or combination thereof.

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

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

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

1 is a diagram showing a conventional spatial image projection apparatus. Referring to FIG. 1, the display 100 may output a holographic image. The first prism array 102 is positioned in front of the display 100, and a plurality of prisms 110 are arranged to refract an incident ray.

In this regard, a detailed configuration of the first prism array 102 will be described with reference to FIG. 2 for a while. Referring to FIG. 2, the first prism array 102 refracts a first ray incident in a first direction and a second ray incident in a second direction different from the first direction in the viewer's direction. ) Is configured to be arranged in succession.

Each of the plurality of prisms 110 has an incidence surface 116 that is an optical plane to which the light rays are incident, a first facet 112 that is an optical plane that refracts the first light rays incident from the lower part of the prism 110, and It may include a second facet 114 that is an optical plane that refracts a second light beam incident on the prism 110 in a different direction from the first light beam.

In this case, the rays from which the first and second rays are refracted may travel parallel to each other in the viewing direction of the viewer.

Referring back to FIG. 1, the first ray 104 incident on the first prism array 102 in the first direction among the rays of the holographic image output from the display 100 is refracted by the first prism array 102. . In this case, the viewer can observe the 3D image 108 projected as a virtual image behind the first prism array 102.

Meanwhile, the light rays 106 of the background image incident on the first prism array 102 in the second direction from the real space are refracted by the first prism array 102 and are directed to the viewer.

In other words, the first ray 104 output from the display 100 is refracted by the first facet 112 of the prism, and the background ray 106 is refracted by 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 holographic image output from the display 100 and the light rays 106 of the background image incident from real space are refracted through the first prism array 102, color dispersion occurs.

3, when the first light rays 104 output from the display 100 pass through the first prism array 102 and are diffracted, each wavelength (red (R) wavelength, green (G) wavelength, and blue ( Due to the difference in refractive index of B) wavelength), rays of red (R) wavelength, green (G) wavelength, and blue (B) wavelength of each pixel of a holographic image are dispersed to different positions, resulting in color dispersion.

That is, even if a clean image is output through the display 100, when passing through the first prism array 102, each color is separated by color dispersion, resulting in a color dispersion problem in which the image is projected onto the space.

4 is a diagram showing a spatial imaging 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 holographic image to the front of the spatial image projection apparatus.

The first prism array 102 may be positioned in front of the display 100, and a prism surface of the first prism array 102 (ie, a surface facing the prism) may be configured to face the front of the spatial image projection apparatus. When the light rays 104 of the holographic image output from the display 100 are incident, the first prism array 102 may refract a plurality of incident rays toward the viewer's viewing direction or the front surface of the first prism array 102. have.

Meanwhile, as described above with reference to FIG. 3, when the light beam 104 of the holographic image output from the display 100 passes through the first prism array 102, color dispersion occurs.

To solve this problem, the spatial image projection apparatus generates color variance data for each pixel by matching the location information of each pixel of the original image and the location information of the red, green, and blue subpixels for each pixel. By rearranging each sub-pixel for all pixels based on the chromatic dispersion data of the pixels of the image, a holographic image for removing chromatic dispersion may be output.

Here, the chromatic dispersion data of the pixel may be data indicating a degree to which light rays having a red wavelength, a green wavelength, and a blue wavelength of each pixel of the original image pass through the first prism array 102 and are refracted. The color dispersion data of a pixel may include a mapping table for position information of each pixel with respect to an original image and correction position information of a sub-pixel with respect to red, green, and blue of each pixel. The corrected position information of the sub-pixels for red, green, and blue of each pixel is obtained by passing through the first prism array 102 for all pixels of the original image output from the display 100, and the red wavelength and green color. The degree of refraction may be indicated by being dispersed with light of wavelength and blue wavelength.

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

The second prism array 400 is disposed above the display 100 and is positioned 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 ray incident from the rear of 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 form a background image in the spatial image projection device by refracting the background ray 402 incident from the rear of the spatial image projection device.

At this time, since the background ray 402 is a ray incident on a real space, it is impossible to correct the color dispersion of a holographic image according to the color dispersion data of the pixel. Therefore, in order to solve the color dispersion problem of the background image, the background ray 402 refracted through the second prism array 400 is disposed in a direction opposite to the second prism array 400 ( 102), the color dispersion of the background image can be corrected.

This is because the first prism array 102 and the second prism array 400 are symmetrically installed in opposite directions, and each prism has the same vertex angle. Accordingly, the first prism array 102 and the second prism array are The amount of chromatic dispersion of the array 400 becomes the same, 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. Referring to FIG. 5, the 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 holographic image for the front side. For example, as described above with reference to FIG. 4, the first display 502 may output a front holographic image for removing color dispersion.

The first display 502 may be positioned on a first side (eg, right) of the spatial image projection apparatus 500, and the first display 502 may be disposed to form a predetermined angle with the first prism array 506.

The second display 504 may output a holographic image for a rear surface. For example, the second display 504 may output a holographic image for a rear surface for removing color dispersion as described above with reference to FIG. 4.

The second display 504 may be positioned on a second side (eg, left) of the spatial image projection apparatus 500 and may be disposed to form a predetermined angle with the second prism array 508.

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

The second prism array 508 may be positioned on the rear surface of the spatial image projection apparatus and may refract light rays of the rear holographic image output through the second display 504.

The first prism array 506 and the second prism array 508 may be symmetrically installed in opposite directions. For example, the prism surface of the first prism array 506 is configured to face the front of the spatial image projection device 500, and the prism surface of the second prism array 508 is the rear of the spatial image projection device 500. It can be configured to face.

The light rays 510 of the front holographic image output from the first display 502 are refracted by the first prism array 506 and directed toward the front side. At the same time, the light rays 512 of the rear background incident from the rear of the spatial image projection apparatus 500 and refracted by the second prism array 508 are also re-refracted by the first prism array 506 and It faces the front.

At this time, the light rays 512 of the rear background are refracted by the second prism array 508 and then re-refracted by the first prism array 506 disposed in the opposite direction to the second prism array 508. Color dispersion for 512 can be corrected.

A viewer positioned in front of the spatial image projection apparatus 500 may view a stereoscopic image 518 projected with a front holographic image for which chromatic dispersion is corrected and a rear background for which chromatic dispersion is corrected.

The ray 514 of the holographic image for the rear surface output from the second display 504 is refracted by the second prism array 508 and is directed to the rear surface. At the same time, the light rays 516 of the front background that are incident from the front of the spatial image projection apparatus 500 and refracted by the first prism array 506 are also rerefracted by the second prism array 508 and are It faces back.

At this time, the light rays 516 of the front background are refracted by the first prism array 506 and then re-refracted by the second prism array 508 disposed in the opposite direction to the first prism array 506, thereby The chromatic dispersion for 516 can be corrected.

A viewer located at the rear of the spatial image projection apparatus 500 may view a stereoscopic image 520 projected with a rear holographic image for which chromatic dispersion is corrected and a front background for which chromatic dispersion is corrected.

Accordingly, according to the spatial image projection apparatus 500 according to an embodiment of the present invention, different 3D images may be provided to viewers located in the front and the rear. In addition, it is possible to provide a stereoscopic image for a holographic image and a background image in which color dispersion is corrected.

6 is a diagram illustrating a reflection noise problem of a holographic image according to an embodiment of the present invention. 5 and 6 (a) together, the light rays 514 of the rear holographic image output from the second display 504 are refracted by the second prism array 508 and are directed to the rear side.

In this case, a part of the light rays 514 of the rear holographic image may be reflected from the second prism array 508 and directed to the first prism array 506. For example, a part of the light rays 514 of the holographic image for the rear surface are reflected from the inside of the second prism array 508 or from the incident surface, and the noise rays 600 are directed to the first prism array 506. In addition, a noise ray 602 in which a part of the ray 514 of the rear holographic image is reflected from the prism surface of the second prism array 508 is directed to the first prism array 506.

Accordingly, unnecessary noise is seen by a viewer located in front of the spatial image projection apparatus 500 as shown in FIG. 6(b).

7 is a diagram illustrating a spatial image projection apparatus according to another exemplary embodiment of the present invention. Referring to FIG. 7, the 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 of the spatial image projection apparatus 500 illustrated in FIG. 5 may also be applied to the spatial image projection apparatus 700 illustrated in FIG. 7. Hereinafter, the same contents as those described in the spatial image projection apparatus 500 illustrated in FIG. 5 will be omitted for convenience.

Each of the first display 502, the second display 504, the first prism array 506, and the second prism array 508 may include a polarizing film 704 to solve the above-described noise generation problem. I can.

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

The first type of polarizing film 704 may be attached to the first prism array 506. The second type of polarizing film 704 may be attached to the second prism array 508.

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. In addition, a first type of polarizing film 704 may be attached to the front 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 vertical polarization (S-pol) film. have. Hereinafter, it is assumed that the first type of polarizing film 704 is a parallel polarizing film, and the second type of polarizing film 704 is a vertical polarizing film.

The light ray 708 of the front holographic image output from the first display 502 passes through the first type of polarizing film 704 of the first display 502 and has a polarization state of P-pol, which is 1 Since it is in the same polarization state as the first type of polarizing film 704 attached to the prism array 506, the spatial image projection apparatus 700 passes through the first prism array 506 and the first type of polarizing film 704. It is directed to the viewer located in front of ).

The light rays 710 of the rear background do not have polarization characteristics because they are in a general natural environment. The light rays 710 of the rear background pass through the second prism array 508 and have a polarization state of S-pol, which is polarized with the first type of polarizing film 704 attached to the first prism array 506 Since the directions are perpendicular to each other, they cannot pass through the first prism array 506 and the first type of polarizing film 704 and are blocked.

The light rays 712 of the holographic image for the rear surface output from the second display 504 pass through the second type of polarizing film 704 of the second display 504 and have the polarization characteristic of S-pol, which is 2 It has the same polarization state as the second type of polarizing film 704 attached to the prism array 508, which passes through the second prism array 508 and the second type of polarizing film 704 to project a spatial image. It is directed to the viewer at the back of the device 700.

On the other hand, some of the light rays 714 of the light rays 712 of the rear holographic image having the polarization characteristic of S-pol are reflected from the second prism array 508 and are directed to the first prism array 506. However, some of the light rays 714 of the light rays 712 of the rear holographic image having the polarization characteristics of S-pol are perpendicular to the polarization direction of the first type of polarizing film 704 of the first prism array 506 Therefore, the first prism array 506 and the first type of polarizing film 704 cannot be passed through and are blocked.

Accordingly, viewers of the front and rear surfaces of the spatial image projection apparatus 500 cannot see the surrounding background images, but can view the stereoscopic images 716 of the front and rear holographic images without noise images.

8 is a diagram illustrating a spatial image projection apparatus according to another embodiment of the present invention. Referring to FIG. 8, the 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 for the spatial image projection apparatus 500 illustrated in FIG. 5 may also be applied to the spatial image projection apparatus 800 illustrated in FIG. 8. Hereinafter, the same contents as those described for the spatial image projection apparatus 500 illustrated in FIG. 5 will be omitted for convenience.

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

A wave plate 802 may be included.

파장판(802)과 직교하는 제 2 종의

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

Of the second kind orthogonal to the wave plate 802

A wave plate 802 may be included.

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

A wave plate 802 may be included.

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 and a first type of polarizing film 704 orthogonal to the first type of polarizing film 704.

Of the second kind orthogonal to the wave plate 802

A wave plate 802 may be included.

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 of the display panel 702 of the first display 502, a second type of polarizing film 704 and a first type of

The wave plate 802 may be configured to be attached. A first type of polarizing film 704 is attached to the front surface of the prism surface 706 of the first prism array 506, and the first type of 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 vertical polarization (S-pol) film. have. Also, the first kind

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

The wave plate 802 may have a characteristic of rotating the phase of the wavelength of light by -45 degrees. Hereinafter, it is assumed that the first type of polarizing film 704 is a parallel polarizing film, and the second type of polarizing film 704 is a vertical polarizing film. Also, the first kind

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

The description will be made on the assumption that the wave plate 802 has a characteristic of rotating the phase of the wavelength of light by -45 degrees.

파장판(802)을 통과해 좌원 편광 성분을 갖게 된다.The light rays 708 of the front holographic image output from the first display 502 pass through the second type of polarizing film 704 of the first display 502 and have S-pol polarization characteristics. The light rays 708 of the holographic image for the front surface passing through the second type of polarizing film 704 are of the first type of the first display 502 as shown in Equation 1

It passes through the wave plate 802 and has a left-circle 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.Of the first kind of the first display 502

The light rays 708 of the holographic image for the front surface passing through the wave plate 802 are of the first type of the first prism array 506.

The wave plate 802 and the first type of polarizing film 704 are sequentially passed. As shown in Equation 2, the light ray 708 of the holographic image for the front surface having a left-circular polarization component

It passes through the wave plate 802 to have the polarization characteristics of P-pol, and passes through the first type of polarizing film 704 having the same polarization component.

파장판(802)을 통과하여 우원 편광 성분을 가지게 된다. The light rays 710 of the rear background do not have polarization characteristics because they are in a general natural environment. The light rays 710 of the rear background pass through the first type of polarizing film 704 of the second prism array 508 and have a polarization component of P-pol. Rays 710 of the rear background are of the first kind

It passes through the wave plate 802 and has a right-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 light rays 710 of the back background with the right circular polarization component are directed to the first prism array 506. The light rays 710 of the rear background are of the first kind of the first prism array 506

After passing through the wave plate 802, the polarization component of P-pol is changed as shown in Equation 3, which passes through the first type 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 rays 712 of the holographic image for the rear surface output from the second display 504 pass through the second type of polarizing film 704 of the second display 504 to determine the polarization characteristics of S-pol as shown in Equation 4. Will have. The light rays 712 of the holographic image for the rear surface passing through the second type of polarizing film 704 are

It passes through the wave plate 802 and has a component of right-circular polarization 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 part 714 of the light rays 712 of the rear surface holographic image having the component of right-circular polarization are formed of the second kind of the second prism array 508 through surface reflection and internal reflection.

It is incident back into the interior of the spatial image projection apparatus 800 through the wave plate 802. At this time, of the second kind

Part of the light rays 712 of the holographic image for the rear surface passing through the wave plate 802

Since the wave plate 802 is re-passed in the opposite direction, the second type

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

파장판(802)을 통과하여 좌원 편광 성분을 가지게 되고 제 1 프리즘 어레이(506)로 향하게 된다.Part of the light rays 714 of the light rays 712 of the rear holographic image having a P-pol component maintain the polarization state as it is, and the second kind of

It passes through the wave plate 802 to have a left circular polarization component and is directed to the first prism array 506.

Part of the light rays 714 of the light rays 712 of the rear holographic image having the left-circle polarization component pass through the first type of wave plate 802 of the first prism array 506 and S-pol as shown in Equation 5 It has a polarization component.

Since the first type of polarizing film 704 having a P-pol polarization component is attached to the first prism array 506, a part of the ray 712 of the rear holographic image having the S-pol polarization component ( 714 is blocked without passing through the first type of polarizing film 704 attached to the first prism array 506.

Accordingly, a partial ray 714 of the ray 714 of the rear holographic image reflected by the second prism array 508, that is, a stereoscopic image of noise is not projected.

Accordingly, a viewer in front of the spatial image projection apparatus 800 views only the three-dimensional image 716 of the light rays 708 of the front holographic image and the rays 710 of the rear background.

In addition, a viewer at the rear of the spatial image projection apparatus 800 views only the three-dimensional image 520 of the ray 514 of the rear holographic image and the ray 516 of the front background (see FIG. 5 ).

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. .

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)

In the spatial image projection apparatus,
A first display located on a first side of the spatial image projection apparatus and outputting a front holographic image;
A second display positioned on a second side of the spatial image projection apparatus and outputting a rear holographic image;
A first prism array positioned on a front surface of the spatial image projection apparatus and refracting a light beam of the front holographic image; And
A second prism array located on the rear surface of the spatial image projection device and refracting the light rays of the rear holographic image
Including,
The first display includes a first type of polarizing film,
The spatial image projection apparatus, wherein the second display includes a second type of polarizing film orthogonal to the first type of polarizing film.
delete The method of claim 1,
The first prism array includes a first type of polarizing film,
The second prism array comprises a second type of polarizing film orthogonal to the first type of polarizing film.
In the spatial image projection apparatus,
A first display located on a first side of the spatial image projection apparatus and outputting a front holographic image;
A second display positioned on a second side of the spatial image projection apparatus and outputting a rear holographic image;
A first prism array positioned on a front surface of the spatial image projection apparatus and refracting a light beam of the front holographic image; And
A second prism array located on the rear surface of the spatial image projection device and refracting the light rays of the rear holographic image
Including,
The first prism array is a first type of polarizing film and a first type of

The spatial image projection apparatus comprising a wave plate.
The method of claim 4,
The second prism array is a first type of polarizing film and the first type of

Of the second kind orthogonal to the wave plate

The spatial image projection apparatus comprising a wave plate.
The method of claim 5,
The first display includes a second type of polarizing film and a first type of polarizing film orthogonal to the first type of polarizing film.

The spatial image projection apparatus comprising a wave plate.
The method of claim 6,
The second display includes a second type of polarizing film orthogonal to the first type of polarizing film and the first type of polarizing film.

Of the second kind orthogonal to the wave plate

The spatial image projection apparatus comprising a wave plate.
In the spatial image projection apparatus,
A first display located on a first side of the spatial image projection apparatus and outputting a front holographic image;
A second display positioned on a second side of the spatial image projection apparatus and outputting a rear holographic image;
A first prism array positioned on a front surface of the spatial image projection apparatus and refracting a light beam of the front holographic image; And
A second prism array located on the rear surface of the spatial image projection device and refracting the light rays of the rear holographic image
Including,
Wherein the first prism array is incident from a rear side of the spatial image projection apparatus and rerefracts the light rays of the rear background refracted by the second prism array.
In the spatial image projection apparatus,
A first display located on a first side of the spatial image projection apparatus and outputting a front holographic image;
A second display positioned on a second side of the spatial image projection apparatus and outputting a rear holographic image;
A first prism array positioned on a front surface of the spatial image projection apparatus and refracting a light beam of the front holographic image; And
A second prism array located on the rear surface of the spatial image projection device and refracting the light rays of the rear holographic image
Including,
Wherein the second prism array is incident from a front side of the spatial image projection device and rerefracts the light rays of the front background refracted by the first prism array.
In the spatial image projection apparatus,
A first display for outputting a front holographic image;
A second display for outputting a rear holographic image;
A first prism array refracting the light rays of the front holographic image; And
Second prism array refracting the light rays of the rear holographic image
Including,
The first prism array projects a floating hologram of the front hologram image into the spatial image projection device,
The second prism array projects a floating hologram of the rear holographic image into the interior of the spatial image projection device,
The first prism array and the second prism array refract rays of a rear background incident from the rear of the spatial image projection device to form an image of the rear background in the spatial image projection device,
The first prism array and the second prism array refract rays of a front background incident from the front of the spatial image projection device to form an image of the front background in the spatial image projection device,
Each of the first display, the second display, the first prism array, and the second prism array includes a polarizing film.
delete delete The method of claim 10,
Each of the first display, the second display, the first prism array, and the second prism array

The spatial image projection apparatus further comprising a wave plate.
The method of claim 13,
The first prism array and the second prism array include 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. That is, a spatial image projection device.
The method of claim 13,
The first display and the first prism array are

Including a wave plate, the second display and the second prism array is the first type

Of the second kind orthogonal to the wave plate

The spatial image projection apparatus comprising a wave plate.
The method of claim 10,
Wherein the first prism array is incident from a rear side of the spatial image projection apparatus and rerefracts the light rays of the rear background refracted by the second prism array.
The method of claim 10,
The second prism array re-refracts the light rays of the front background that are incident from the front of the spatial image projection device and refracted by the first prism array.

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