KR102480120B1 - Three-dimensional image projection apparatus - Google Patents

Abstract

The spatial image projection device includes a case having an image output space and an image projection space therein, an image output unit disposed in the image output space and outputting an image, a mirror unit disposed in the image output space and reflecting an image toward the image projection space, and A transparent screen unit disposed in the image projection space to project a spatial image by scattering or diffracting the reflected image toward the front of the case, and the transparent screen unit blocks rays of a predetermined range of angles among the scattered or diffracted image rays. 1 may include a time zone adjustment filter.

Description

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

The present invention relates to a spatial image projection device.

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

This 3D spatial image display technology provides a 3D image using the principle of human binocular disparity. According to this method of realizing a 3D spatial image, since the images reflected on the left eye and the right eye are different from each other, it is possible to provide a three-dimensional effect and a sense of protrusion through the perception of parallax by both eyes of the observer.

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. . Among the spectacle methods, the polarized spectacle method and the shutter spectacle method are the oldest 3D display methods and are widely used in stereoscopic movies and 3D TVs. However, the polarization spectacle method and the shutter spectacle method have problems of increasing the discomfort and eye fatigue of having to wear special glasses for spatial imaging. Among the glasses-free methods, the lenticular method and the parallax barrier method have low luminance and low-resolution images, and the observer's observation point is fixed, and they have the disadvantage of causing headaches or dizziness when the observer continuously observes.

On the other hand, full stereoscopic methods include hologram and volume type 3D display methods. In this full stereoscopic method, only a spatial image in a stationary state is implemented using an expensive laser and a precise optical device, and it cannot provide real-time high-definition spatial images.

Recently, methods for implementing real-time spatial images at low cost using half mirrors, concave mirrors, Fresnel lenses, prism arrays, and the like have been proposed.

In this regard, Korean Patent Publication No. 2017-0057713 discloses a floating hologram device using a plurality of floating mirrors and a floating hologram implementation method.

An object of the present invention is to provide a space image projection device that removes a space image formed on an inside and outside floor by installing a viewing area adjustment filter on a transparent screen of the space image projection device. However, the technical problem to be achieved by the present embodiment is not limited to the technical problems described above, and other technical problems may exist.

As a technical means for achieving the above-described technical problem, a spatial image projection device according to a first aspect of the present invention includes a case having an image output space and an image projection space therein; an image output unit disposed in the image output space to output an image; a mirror unit disposed in the image output space to reflect the image toward the image projection space; and a transparent screen unit disposed in the image projection space to project a space image by scattering or diffracting the reflected image toward the front of the case, wherein the transparent screen unit has an angle within a predetermined range among the scattered or diffracted image rays. It may include a first field of view adjustment filter that blocks light rays of.

A spatial image projection apparatus according to a second aspect of the present invention includes an image output unit outputting an image in an image output space formed on the upper part of the spatial image projection apparatus; a mirror unit reflecting the image; and a transparent screen unit projecting a spatial image by scattering or diffracting the reflected image forward of the spatial image projection device in an image projection space located below the image output space, wherein the transparent screen unit scatters or diffracts the reflected image. A first field-of-view adjustment filter may be included to block rays of a predetermined range of angles among rays of the image.

The above-described means for solving the problems is only illustrative and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and detailed description.

According to any one of the above-mentioned problem solving means of the present invention, the present invention can remove the spatial image formed on the inside and outside of the floor by installing a viewing area adjustment filter on the transparent screen part of the spatial image projection device, and can create a sense of space. It is possible to provide a spatial image projection device that can be improved. Through this, the hologram effect can be enhanced.

1 is an exemplary diagram of a space image projection apparatus according to an embodiment of the present invention.
2A to 2B are enlarged views of a portion of the transparent screen of the spatial image projection apparatus according to an embodiment of the present invention.
3A to 3C are views for explaining a plurality of barriers used in a time zone adjustment filter according to an embodiment of the present invention.
4 is a diagram for comparing a space image projected through a conventional space image projection device with a space image projected through the space image projection device of the present invention.
5 is an exemplary diagram of a spatial image projection device according to another embodiment of the present invention.
6 is an exemplary view of a spatial image projection device according to another embodiment of the present invention.
7 is a diagram for explaining a light path according to an angle of a light beam incident to a field of view adjustment filter according to an embodiment of the present invention.
8 is a diagram illustrating a spatial image projected through a spatial image projection apparatus according to an embodiment of the present invention.
9 is a diagram for comparing a space image projected through a conventional space image projection device with a space image projected through a space image projection device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "electrically connected" with another element interposed therebetween. . In addition, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated.

In this specification, a "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, and two or more units may be realized by one hardware.

Hereinafter, specific details for the implementation of the present invention will be described with reference to the accompanying configuration diagram or process flow chart.

1 is an exemplary diagram of a space image projection apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , a spatial image projection device 10 may include a case 100 , an image output unit 110 , a mirror unit 120 and a transparent screen unit 130 . However, since the spatial image projection device 10 of FIG. 1 is only one embodiment of the present invention, the present invention is not limitedly interpreted through FIG. 1, and is configured differently from FIG. 1 according to various embodiments of the present invention. It could be.

The case 100 may be configured by being separated into a first case 102 having an image output space and a second case 104 having an image projection space inside the case 100 . At this time, the first case 102 is disposed above the second case 102 .

The first case 102 is made of, for example, a material that does not have light transmission properties, and the second case 104 is made of a material that has light transmission properties. Accordingly, the observer cannot check the inside of the first case 102 and can view the space image projected through the second case 104 .

The case 100 may be formed in a cylindrical shape, for example. For example, the first case 102 is made of an opaque material in a cylindrical shape, but the second case 104 may be made of transparent curved glass in a cylindrical shape.

The first case 102 has an image output unit 110 and a mirror unit 120 installed inside the first case 102 so that a space image is projected inside the second case 104 .

The video output unit 110 is disposed in the front of the video output space (ie, in the direction of the viewer) and outputs the video to the rear. For example, the image output unit 110 may output an image to the rear of the first case 102 where the mirror unit 120 is disposed. Such an image output unit 110 may be, for example, a projector.

The mirror unit 120 is disposed at the rear of the first case 102 in a state of being inclined at a predetermined angle to reflect the image output from the image output unit 110 toward the image projection space.

The transparent screen unit 130 is disposed in the image projection space of the second case 104 and scatters or diffracts the image reflected by the mirror unit 120 toward the front of the case 100 to project a spatial image.

The transparent screen unit 130 may be disposed in the center of the image projection space inside the second case 104 . The transparent screen unit may be a screen that scatters the projected image or a holographic diffraction screen based on a Holographic Optical Element (HOE) that diffracts the image. Below is the case of a scattering screen.

An image reflected by the mirror unit 120 is directed to the transparent screen unit 130 disposed on the second case 104 . At this time, a portion of the image directed to the transparent screen unit 130 is scattered by the transparent screen unit 130 and directed to an area observable from the observer's side, and the non-scattered image goes straight ahead to form the space image projection device 10. It is directed to the lower end and formed as noise on the floor inside or outside of the spatial image projection device 10.

FIG. 2A is an enlarged view of a partial area 140 of the transparent screen unit 130. Referring to FIG.

Referring to FIG. 2A together, among the plurality of light rays of the image reflected by the mirror unit 120, the first light rays L0 and 200 are scattered while passing through the transparent screen unit 130, and then a plurality of light rays L01 to L06, 202) spread out. Here, the spread angles of the plurality of light rays L01 to L06 and 202 may vary depending on the characteristics of the transparent screen unit 130 . In general, when the transmittance is high, scattering is reduced and the spreading angle is narrowed, and when the transmittance is low, scattering is increased and the spreading angle is widened. Among the scattered rays, some rays L01 to L03 are observed by the observer according to the observer's position, and the remaining rays L04 to L06 are directed to the floor inside or outside the spatial image projection device 10.

In the case of a general transparent screen, many of the light rays of the image reflected by the mirror unit 120 are transmitted as they are. That is, among the rays of the reflected image, the light ray L05 traveling straight to the bottom of the spatial image projection device 10 becomes the brightest ray, and the ray becomes darker as it goes upward or downward. Therefore, since the spatial image formed on the floor is brighter than the spatial image projected in the image projection space, the hologram effect is lowered.

As a method for improving this problem, as shown in FIG. 2B, the first viewing area adjustment filter 150 is installed on the transparent screen unit 130 to block light rays having an angle within a predetermined range, thereby increasing the hologram effect. Referring to FIG. 2B , the first light rays L0 and 200 incident on the transparent screen unit 130 are scattered and spread as a plurality of light rays L01 to L06. Among them, only the second light ray L02 and the third light ray L03 pass through the first field of view adjusting filter 150 and are directed to the observer, and the remaining light rays L01, L04, L05, and L06 pass through the first field of view adjusting filter (150). 150) is blocked. That is, since the light beams L04, L05, and L06 directly projected onto the floor inside and outside of the spatial image projecting device 10 are blocked, a spatial image is not projected onto the floor.

For a moment, the first time zone adjusting filter 150 will be described with reference to FIGS. 3A to 3C .

Referring to FIG. 3A , the first viewing area adjusting filter 150 includes a lower surface 301 and an upper surface 311, and when viewed from the front of the spatial image projection device 10, a plurality of barriers 303 extending in the transverse direction. ) may be included.

The plurality of barriers 303 protrude in a vertical direction from the lower surface 303 toward the upper surface 311 and may be disposed at intervals along the vertical direction when an observer looks at the spatial image projection device 10 .

When the height 305 of the plurality of barriers 303 is P _h and the spacing 307 between the plurality of barriers 303 is P _w , the reflected light that can pass through the first time zone adjustment filter 150 is The passing angle 309 of the light ray of the image is as shown in Equation 1.

Referring to FIG. 3B , the first viewing area adjusting filter 150 may adjust an angle at which light rays are blocked by changing at least one of a height 305 and an arrangement interval 307 of the plurality of barriers 303 . For example, reference numeral 315 denotes a first arrangement of the plurality of barriers 303, and a space image can be viewed only in a specific direction by passing only light rays within a specific angle.

Also, reference numeral 317 denotes a second arrangement of the plurality of barriers 303, and by setting the height of the barriers 303 relatively high, the passing angle of light rays can be narrowly adjusted.

Also, reference numeral 319 denotes a third arrangement of the plurality of barriers 303, and by setting the height of the barriers 303 low, the passing angle of light rays can be widened. In addition, as shown in reference numerals 321 and 323, the passage angle of light rays may be adjusted to be wide or narrow by setting a wide or narrow spacing between the plurality of barriers 303.

On the other hand, if the first viewing area adjusting filter 150 of the form shown in FIG. 3A is used, the brightness of the light beam directed to the observer may be reduced.

In other words, it is necessary to design the first viewing area adjustment filter 150 so that the decrease in brightness of the light beam of the image passing through the transparent screen unit 130 can be minimized.

, 313)로 기울어진 제 1 시역 조절 필터(150)를 사용할 수 있다. 여기서, 복수의 배리어(303)는 소정 각도(

, 313)로 기울어져 돌출되어 있으며, 관찰자가 공간 영상 투영 장치(10)를 바라볼 때 종방향을 따라 간격을 두고 배치될 수 있다. Referring to FIG. 3C, the plurality of barriers 303 are formed at a predetermined angle (

, 313), the first time zone adjusting filter 150 may be used. Here, the plurality of barriers 303 have a predetermined angle (

, 313), and may be arranged at intervals along the longitudinal direction when an observer looks at the spatial image projection device 10.

Since the plurality of barriers 303 are disposed in an inclined state, only light rays substantially parallel to each barrier 303 may pass through the first viewing area adjusting filter 150 .

라고 하면, 제 1 시역 조절 필터(150)를 통과하는 광선의 통과 각도 (309)는 수학식 2와 같다. The arrangement interval 307 of the plurality of barriers 303 is P _w , the height 305 is P _h , and the inclination angle of each barrier 303 is

, the passage angle 309 of the light ray passing through the first viewing area adjustment filter 150 is equal to Equation 2.

Therefore, the first time-zone adjustment filter 150 determines the height 305 of the plurality of barriers 303, the arrangement interval 307, and the angle formed by the lower surface 301 and the plurality of barriers 303 (inclination of the barrier 303). By changing at least one of the degrees 313), it is possible to control the angle within a predetermined range, and accordingly, it is possible to adjust the output direction and the passing angle of the light ray. Through this, it is possible to minimize the loss of the light beam directed to the observer.

Meanwhile, an internal reflection noise image may be removed by attaching a polarization filter to one surface of the case 100 .

4 is a diagram for comparing a space image projected through a conventional space image projection device and a space image projected through the space image projection device 10 of the present invention.

Referring to FIG. 4, as shown by reference numeral 40, when an image is refracted through an existing transparent screen without a first viewing area adjustment filter 150, it can be confirmed that the projected image is formed with noise on the floor of the spatial image projection device. .

As shown in reference numeral 42, when the image is refracted through the transparent screen on which the first viewing area adjustment filter 150 is installed, it can be confirmed that noise formed on the floor of the spatial image projection device 10 is significantly reduced.

5 is an exemplary diagram of a spatial image projection device 10 according to another embodiment of the present invention.

Referring to FIG. 5 , a first time zone adjustment filter 500 may be installed on the outside of one surface of the case 100 facing the transparent screen unit 130 . For example, the first time zone adjustment filter 500 may be installed only in the second case 104 .

At this time, light rays of an image reflected by the mirror unit 120 are incident on the transparent screen unit 130, and a plurality of incident light rays are refracted by the transparent screen unit 130 and spread.

Among the plurality of reflected light rays, the first light rays L0 and 502 are scattered by the transparent screen unit 130 and spread in a plurality of directions. Among them, some of the light rays L01, L02, and L03 directed forward of the spatial image projection device 10 are directed to the observer, but some of the light rays L04 to L09 directed downward do not reach the viewer, and the spatial image Noise is formed toward the bottom of the inside and outside of the projection device 10 . Some of the light rays L04 to L07 among the light rays directed to the floor of the spatial image projection apparatus 10 are blocked by the first field of view adjustment filter 500, so noise formed by the corresponding partial rays L04 to L07 is removed.

Since some of the light rays L08 and L09 that do not go to the first viewing area adjustment filter 500 and go to the inner floor of the spatial image projection device 10 are not removed, noise is still formed on the inner floor. In order to remove noise formed on the inner floor of the spatial image projecting device 10, a second viewing area adjusting filter 600 may be installed on the inner floor of the case 100 as shown in FIG. 6 .

Referring to FIG. 6 , the second viewing area control filter 600 is disposed on the floor inside the case 100 and can block rays having angles within a predetermined range among rays refracted by the transparent screen unit 130 and heading toward the floor. there is.

The second viewing area adjusting filter 600 may further block a light ray directed toward the floor inside the case 100 from being refracted at the floor and directed toward the front of the case 100 .

The second time zone adjusting filter 600 protrudes from the lower surface toward the upper surface like the first time zone adjusting filter 150 described in FIGS. Including, it is possible to control the angle within a predetermined range by changing at least one of the height of the plurality of barriers, the arrangement interval, and the angle between the lower surface and the plurality of barriers.

Looking at the path of light rays of an image reflected by the mirror unit 120 by enlarging a partial area of the transparent screen unit 130, a plurality of light rays L11, L12, and L13 refracted by the transparent screen unit 130 and heading to the floor. , L14), some light rays 610 are reflected by the second viewing area adjusting filter 600, and some light rays 620 enter the second viewing area adjusting filter 600.

A light ray entering the second viewing area adjusting filter 600 has a light path as shown in FIG. 7 according to an incident angle.

)로 입사되는 제 1 광선(L21, 700)의 경우, 제 1 광선(700)에 대한 입사광의 일부는 제 2 시역 조절 필터(600)의 표면에서 반사되고 나머지는 내부로 입사된다. 이 때, 제 2 시역 조절 필터(600)의 내부로 입사되는 광선은 제 2 시역 조절 필터(600)의 바닥으로 향하지 못하고, 배리어로 향하게 된다. 제 2 시역 조절 필터(600)의 배리어의 경우 난반사를 시키도록 구성되어 있기 때문에 제 2 시역 조절 필터(600)의 내부로 입사되는 광선은 제 2 시역 조절 필터(600)에 의해 차단된다. Specifically, referring to FIG. 7 , when the interval between the plurality of barriers constituting the second time range adjusting filter 600 is P _w and the height of each barrier is P _h , the second time range adjusting filter 600 is directed toward 1st angle (

) In the case of the first light beam (L21, 700) that is incident, a part of the incident light of the first light beam 700 is reflected from the surface of the second viewing area adjusting filter 600 and the rest is incident to the inside. At this time, light rays incident to the inside of the second viewing area adjusting filter 600 do not go to the bottom of the second viewing area adjusting filter 600 and are directed to the barrier. Since the barrier of the second time range adjusting filter 600 is configured to cause diffuse reflection, light rays incident into the second time range adjusting filter 600 are blocked by the second time range adjusting filter 600.

, 제 1 각도보다 작은 각도)로 입사되는 제 2 광선(L22, 703)의 경우, 제 2 광선(703)에 대한 입사광의 일부는 제 2 시역 조절 필터(600)의 표면에서 반사되고 나머지는 내부로 입사된다. 제 2 시역 조절 필터(600)의 내부로 입사된 광선은 제 2 시역 조절 필터(600)의 하면으로 향하게 되고 하면을 투과하여 공간 영상 투영 장치(10)의 케이스(100)의 바닥으로 향하여 공간 영상을 형성하거나 하면에서 반사된다. A second angle toward the second time zone adjustment filter 600 (

. is entered into A light beam incident into the second field of view adjusting filter 600 is directed to the lower surface of the second field of view adjusting filter 600, passes through the lower surface, and heads to the bottom of the case 100 of the spatial image projection device 10 to generate a spatial image. formed or reflected from the lower surface.

Since the space image formed on the bottom of the case 100 of the spatial image projection device 10 or the light reflected from the lower surface of the second field of view adjusting filter 600 is blocked by the second field of view adjusting filter 600, the observer 707 ) side is not observed.

, 제 2 각도보다 작은 각도)로 입사되는 제 3 광선(L23, 705)의 경우, 제 2 시역 조절 필터(600)의 표면에서 생기는 일부 반사 외에 제 2 시역 조절 필터(600)의 내부로 입사되어 공간 영상 투영 장치(10)의 케이스의 바닥, 제 2 시역 조절 필터(600)의 바닥면에서 반사되어 제 2 시역 조절 필터(600)의 바깥으로 나오게 된다. 하지만, 이 경우, 제 2 시역 조절 필터(600)로부터 출사되는 제 3 광선(705)이 제 2 시역 조절 필터(600)를 구성하는 배리어의 높이(P_h)를 넘어서지 못하기 때문에 관찰자에게로 향하지 못한다. A third angle toward the second time zone adjusting filter 600 (

. It is reflected from the bottom of the case of the spatial image projection device 10 and the bottom surface of the second field of view adjusting filter 600 and comes out of the second field of view adjusting filter 600 . However, in this case, since the third light ray 705 emitted from the second viewing area adjusting filter 600 does not exceed the height (P _h ) of the barrier constituting the second viewing area adjusting filter 600, it does not reach the observer. can not do it.

When the surface of the second viewing area adjustment filter 600 is made of a reflective material such as a mirror to increase the reflectance, the light reflected from the surface of the second viewing area adjustment filter 600 is not scattered. It does not feel that there is an image on the surface of (600). However, since the spatial image formed on the transparent screen unit 130 appears to be reflected in the mirror, the observer feels as if it is reflected in a mirror in the lower space of the transparent screen unit 130 . In this case, the space image appears to be reflected on the floor, and the effect of increasing the sense of space is obtained.

8 is a diagram illustrating a spatial image projected through the spatial image projection apparatus 10 according to an embodiment of the present invention.

Referring to FIG. 8 , reference numeral 80 shows a projected spatial image when the second viewing area adjusting filter is installed only on the inner floor of the spatial image projection apparatus 10 (the first viewing area adjusting filter is not installed). it is a drawing Referring to reference numeral 80 , it can be seen that noise on the floor inside the spatial image projecting device 10 has been removed, but noise still exists on the floor outside the spatial image projecting device 10 .

Reference numeral 82 denotes that a first time-zone adjustment filter is installed on one side of the case 100 of the spatial image projection device 10, and a second time-zone adjustment filter is installed on the inner bottom of the case 100 of the spatial image projection device 10. It is a diagram showing a projected spatial image when is installed. Referring to reference numeral 82, it can be seen that all noises on the inner and outer floors of the spatial image projection device 10 have been removed. A polarizing filter (eg, a polarizing film, a film capable of reducing the amount of light, such as a tinting film) may be attached to one side in the direction of .

In this regard, referring to reference numeral 90, since the transparent screen 130 is a scattering method, not only the spatial image but also the background behind the transparent screen 130 are transmitted through the transparent screen 130. At this time, if an external light is installed, there is a problem in that the shape of the transparent screen 130 is visible and the transparency is low because the light ray of the image refracted by the transparent screen 130 is scattered due to the light ray of the external light. In addition, the image in front of the spatial image projection device is reflected on the transparent screen 130 and the projected spatial image is also blurred.

However, by attaching the polarization filter 150 to one side of the transparent screen 130 (one side in the direction of the viewer 900) as shown in reference numeral 92, the degree of scattering of the light rays of the image refracted on the transparent screen 130 is reduced. can make it Specifically, light rays emitted from external lighting pass through the polarization filter 150, reduce the amount of light, and are scattered while encountering the transparent screen 130. As the scattered light rays pass through the polarization filter 150 once again while heading toward the observer 900, the amount of light is significantly reduced. Accordingly, the observer cannot observe scattered light due to external lighting, and thus the transparency of the transparent screen 130 due to scattering of the transparent screen 130 can be improved.

However, since the brightness of the spatial image formed on the rear surface of the transparent screen 130 may be reduced due to the polarization filter 150, the transmittance of the transparent screen 130 may be reduced or two or more polarization filters 150 may be overlapped and attached. By doing so, the brightness of the spatial image can be increased.

Since the transparency of the transparent screen 130 decreases as the transmittance decreases, it is corrected by the transparency improved by attaching the polarization filter, and as a result, a transparent screen with improved transparency and brightness can be made.

The above description of the present invention is for illustrative purposes, and those skilled in the art can 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, the embodiments described above should be understood as 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 distributed may 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 modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present invention. .

10: spatial image projection device
100: case
102: first case
104: second case
110: video output unit
120: mirror unit
130: transparent screen unit
150, 500: first time zone adjusting filter
600: second time zone adjustment filter

Claims (18)

In the spatial image projection device,
A case having an image output space and an image projection space therein;
an image output unit disposed in the image output space to output an image;
a mirror unit disposed in the image output space to reflect the image toward the image projection space;
a transparent screen unit disposed in the image projection space to project a spatial image by scattering or diffracting the reflected image toward the front of the case;
a first field-of-view adjusting filter disposed outside one surface of the case and blocking light rays having angles within a predetermined range among the light rays of the scattered or diffracted image; and
A second viewing area adjustment filter disposed on the floor inside the case and blocking light rays having angles within a predetermined range among light rays refracted by the transparent screen unit and directed toward the floor.
A spatial image projection device comprising a.
delete According to claim 1,
The spatial image projection apparatus of claim 1 , wherein the second viewing area adjustment filter further blocks light rays directed toward the floor from being refracted by the floor and directed toward the front of the case.
According to claim 1,
The spatial image projection apparatus of claim 1 , wherein the first viewing area adjustment filter includes a plurality of barriers protruding from the lower surface toward the upper surface and extending in a transverse direction when viewed from the front of the spatial image projection apparatus.
According to claim 4,
Wherein the first viewing area adjustment filter is configured to control the angle within the predetermined range by changing at least one of a height of the plurality of barriers, an arrangement interval, and an angle between the lower surface and the plurality of barriers. .
According to claim 1,
The spatial image projection apparatus of claim 1 , wherein the second viewing area adjustment filter includes a plurality of barriers protruding from the lower surface toward the upper surface and extending in a transverse direction when viewed from the front of the spatial image projection apparatus.
According to claim 6,
Wherein the second viewing area adjusting filter is configured to control the angle within the predetermined range by changing at least one of a height of the plurality of barriers, an arrangement interval, and an angle between the lower surface and the plurality of barriers. .
According to claim 1,
A polarization filter located on one side of the case and removing an image of internal reflection noise
To further include, the spatial image projection device.
According to claim 1,
The case includes a first case having the image output space and made of a material that does not have translucency; and
A second case having the image projection space and made of a light-transmitting material
A spatial image projection device comprising a.
According to claim 9,
Wherein the first case is disposed on top of the second case, the spatial image projection device.
According to claim 9,
The image output unit and the mirror unit are disposed inside the first case,
The image output unit outputs the image to the rear of the first case,
The spatial image projection apparatus of claim 1 , wherein the mirror unit is disposed behind the first case to reflect the image.
According to claim 11,
Wherein the image output unit is a projector, spatial image projection device.
According to claim 9,
The spatial image projection apparatus of claim 1 , wherein the transparent screen unit is disposed at the center of the image projection space inside the second case.
According to claim 1,
The case is a cylindrical shape, spatial image projection device.
In the spatial image projection device,
an image output unit outputting an image in an image output space formed above the spatial image projection device;
a mirror unit reflecting the image;
a transparent screen unit projecting a spatial image by scattering or diffracting the reflected image toward the front of the spatial image projection device in an image projection space located below the image output space;
a first field-of-view adjusting filter disposed outside one surface of the spatial image projection device and blocking rays of a predetermined range of angles among the rays of the scattered or diffracted image; and
A second viewing area adjustment filter disposed on the floor inside the spatial image projection device and blocking rays of a predetermined range of angles among rays refracted by the transparent screen unit and heading toward the floor
A spatial image projection device comprising a.
delete According to claim 15,
A case accommodating the video output unit, the mirror unit, and the transparent screen unit
To further include, the spatial image projection device.
18. The method of claim 17,
A polarization filter located on one side of the case and removing an image of internal reflection noise
To further include, the spatial image projection device.

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