KR102530284B1 - Three-dimensional image projection apparatus - Google Patents

Abstract

The spatial image projection device is located below the first display that outputs an object hologram image and the space image projection device, and is located in front of the second display and the first display that outputs a floor hologram image, and is positioned at a first angle with the first display. It may include a prism array that is slanted and refracts light rays of the object hologram image and the floor hologram image.

Description

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

The present invention relates to a spatial image projection device.

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

This 3D stereoscopic image display technology provides a 3D image using the principle of human binocular disparity. According to this method of realizing a 3D stereoscopic image, since the images reflected on the left and right eyes are different, 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 glasses method and the shutter glasses method have problems of increasing the discomfort and eye fatigue of having to wear special glasses for stereoscopic images. Among the glasses-free methods, the lenticular method and the parallax barrier method have low luminance and low resolution images, and the viewer's observation point is fixed, and they have the disadvantage of causing headaches or dizziness when the viewer continuously observes.

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

Recently, methods for implementing real-time stereoscopic images at low cost using half mirrors, concave mirrors, Fresnel lenses, prism arrays, and the like have been proposed. However, the method using a half mirror has problems in that the 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 problems in that the manufacturing cost is high and the viewing angle is narrow.

As a solution to this problem, a method of forming a stereoscopic image as a virtual image in space using a prism array has recently 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.

Meanwhile, recently, as a method of improving a hologram effect in a prism array-based spatial image projection device, a method of making an image projected on a space have two or more layers has been proposed. In this method, a display panel is positioned at the rear upper end of a symmetrical prism array and another display panel is positioned at the rear lower end, so that the depth of an image projected on a space is projected differently due to a difference in distance between the prism array and the display panel. However, this method causes a problem in that the system becomes large because two display panels must be used and each display panel must be positioned at a different depth.

In order to solve this problem, a method of using a single panel to have two layers has been proposed, but since two different images are output through a display panel, the size of the image projected on the space is reduced. In addition, there is a problem that the viewing area of the entire system is limited because unnecessary images other than the fixed viewing area are shown, and the size of the entire system increases because the depth of the system must be increased by the height of the image projected on the space.

In order to solve this problem, a method of removing a compact and two-layered spatial image by removing an image directed to an area other than the fixed viewing area has been proposed. There is a problem in that there is a difference in three-dimensional effect depending on the content because each shape is floating on the space.

In this regard, Japanese Laid-Open Patent Publication No. 2016-212308 discloses a stereoscopic image display device that displays a stereoscopic image.

A double-layer spatial projection image is provided using a first display disposed at a predetermined angle with the prism array, and a spatial projection image is provided at the lower end of the spatial image projection device through the second display. 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 technical problem, a spatial image projection apparatus according to a first aspect of the present invention includes a first display outputting an object hologram image; a second display located below the spatial image projection device and outputting a floor hologram image; and a prism array located in front of the first display, inclined at a first angle with respect to the display, and refracting light rays of the object hologram image and the floor hologram image.

A spatial image projection apparatus according to a second aspect of the present invention includes a first display including a first output area outputting a first object hologram image and a second output area outputting a second object hologram image; a second display located below the spatial image projection device and outputting a floor hologram image; and a prism array positioned in front of the first display and refracting rays of the first object hologram image, the second object hologram image, and the floor hologram 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-described means for solving the problems of the present invention, a sense of depth can be formed between spatial projection images by providing a double-layer spatial projection image using a prism array and a first display disposed at a predetermined angle. In addition, since a double-layer spatial projection image is provided using only the first display, the size of the system can be reduced.

In addition, it is possible to improve the sense of space by providing an additional spatial projection image through the second display installed at the bottom of the spatial image projection device.

In addition, by disposing the viewing area adjustment filter on the first display, it is possible to block a light ray interfering with a predetermined viewing area among light rays of the object hologram image output from the first display. Through this, the entire visual field of the system can be enlarged, the problem of overlapping spatial projection images caused by the refraction of rays of object hologram images can be solved, and a larger spatial projection image can be provided in a wide vertical viewing area.

1 is a diagram for explaining a principle of projecting a spatial image using a prism array.
2A to 2B are diagrams for explaining a 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 an exemplary diagram of a second display according to an embodiment of the present invention.
5 is a diagram illustrating a plurality of spatial projection images projected through a spatial image projection device on 3D coordinates according to an embodiment of the present invention.
6 is a diagram for explaining a ray path of an object hologram image output from a first display according to an embodiment of the present invention.
7A to 7E are diagrams illustrating simulation results of ray tracing of a ray of an object hologram image output from a first display and a ray tracing of a floor hologram image output from a second display, according to an embodiment of the present invention.
8 is an exemplary diagram illustrating a spatial image projection result using a spatial image projection apparatus according to an 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 a diagram for explaining a principle of projecting a spatial image using a prism array.

Referring to FIG. 1 , a first light ray 104 incident on the prism array 102 in a first direction among light rays of a holographic image output from the display panel 100 is refracted by the prism array 102 . At this time, the observer 106 can observe the stereoscopic image 108 projected as a virtual image behind the prism array 102 .

Meanwhile, the light ray 110 of the background image incident from the real space to the prism array 102 in the second direction is refracted in the prism array 102 and directed to the viewer 106 .

In other words, the first light ray 104 output from the display panel 100 is refracted by the first facet 112 of the prism, and the background light ray 110 is refracted by the second facet 114 of the prism, As a result, the stereoscopic image 108 and the actual background image are projected together.

2A to 2B are diagrams for explaining a spatial image projection apparatus according to an embodiment of the present invention.

Referring to FIGS. 2A and 2B , the first display 201 may output an object hologram image. The first display 201 may output a plurality of object hologram images forward.

For example, the first display 201 may include a first output area 205 outputting a first object holographic image and a second output area 207 outputting a second object holographic image. Here, the first output area 205 of the first display 201 is set to the upper area of the first display 201, and the second output area 207 of the first display 201 is set to the first display 201. ). For example, by forming the height of the first output region 205 higher than the height of the second output region 207, a space projection image corresponding to the first object hologram image is formed on a space corresponding to the second object hologram image. It can be projected larger than the spatial projection image.

The first display 201 can adjust the height of the first output area 205 and the height of the second output area 207 in various ways according to the spatial projection image to be projected in a specific size.

The first display 201 may include one of a Liquid Crystal Display (LCD) display capable of outputting a 2D image, an Organic Light Emitting Diode (OLED) display, and a Quantum Dot display. For another example, the first display 201 may include one of a 3D display including a parallax barrier capable of outputting a 3D image, a lenticular lens, and a prism array. can As another example, the first display 201 may include an integrated image display capable of outputting a 3D volume image, a hologram display, a volume display based on a rotating screen, a volume display based on a multilayer structure, and the like.

The first display 201 may include a viewing area adjusting filter 209 on the front of the first display 201 . Here, the viewing area adjusting filter 209 may block light rays incident at angles within a predetermined range among light rays of the object hologram image output from the first display 201 .

For example, the viewing area adjusting filter 209 may be attached to the front surface of the first output area 205 of the first display 201 . Here, the viewing area adjustment filter 209 may block rays incident at an angle within a predetermined range from among rays of the first object hologram image output from the first output area 205 of the first display 201 . Through this, it is possible to prevent light rays from being dispersed in a wide direction. Unlike this, the viewing area of the display may be adjusted by adding a viewing area adjusting optical system to the rear of the first display 201 .

For example, among the rays of the first object hologram image output from the first output region 205 of the first display 201, a first ray incident at a first angle passes through the viewing area adjusting filter 209, Although it is refracted at the second facet 213 of the prism array 203 to form a spatial projection image, the second ray (ray incident at the second angle) output in a direction different from the first ray is filtered through the field of view adjustment filter. (209) is blocked.

The field of view adjustment filter 209 may include a field of view filter using a parallax barrier, a diffractive optical element (DOE), or a hologram optical element (HOE).

For a moment, the time range adjustment filter 209 will be described with reference to FIGS. 3A to 3C.

Referring to FIG. 3A , the viewing area adjusting filter 209 may include a plurality of barriers 303 extending in a transverse direction from a lower surface 301 toward an upper surface 311 .

The plurality of barriers 303 protrude in a vertical direction from the lower surface 301 and may be disposed at intervals along the longitudinal direction when a viewer looks at the spatial image projection device 20 .

When the height 305 of the plurality of barriers 303 is P _h and the arrangement interval 307 between the plurality of barriers 303 is P _w , the object hologram image that can pass through the viewing area adjustment filter 209 The passing angle 309 of the light ray is as shown in Equation 1.

Referring to FIG. 3B , the viewing area adjustment filter 209 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 stereoscopic 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 305 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 305 of the barriers 303 low, the passing angle of light rays can be widened. Also, as indicated by reference numerals 321 and 323, the passage angle of light rays may be adjusted to be wider or narrower by setting the spacing 307 of the plurality of barriers 303 to be wider or narrower.

, 313_,)로 기울어진 시역 조절 필터(209)를 사용할 수 있다. Referring to FIG. 3C , a difference in left and right viewing angles may occur depending on characteristics such as an angle between the first display 201 and the prism array 203 and a prism apex angle of the prism array 203 . As a method for solving this problem, the plurality of barriers 303 are formed at a predetermined angle (

, 313 _, ) can be used.

, 313)로 기울어져 돌출되어 있으며, 시청자가 공간 영상 투영 장치(20)를 바라볼 때 종방향을 따라 간격을 두고 배치될 수 있다. Here, the plurality of barriers 303 have a predetermined angle (

, 313), and may be arranged at intervals along the longitudinal direction when a viewer looks at the spatial image projection device 20.

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 viewing area adjustment filter 209 .

라고 하면, 시역 조절 필터(209)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 viewing area adjustment filter 209 is equal to Equation 2.

Therefore, the time zone adjustment filter 209 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 (the degree of inclination of the barriers 303, 313), it is possible to control a predetermined range of angles through which light rays pass.

Returning to FIGS. 2A and 2B , among the output rays of the first object hologram image output from the first output area 205 of the first display 201, the rays incident on the prism array 203 in the first direction are prisms. It is refracted on the second facet 213 of the array 203 and directed in the direction of the viewer's field of view. On the other hand, in the case of a light beam incident to the prism array 203 in a direction other than the first direction among the light rays output from the first object hologram image, total reflection occurs or is refracted inside the prism array 203, so that the light beam is different from the viewer's viewing direction. heading in the direction

Meanwhile, since the viewing area adjustment filter 209 is not attached to the second output area 207 of the first display 201, the light beam of the second object hologram image output from the second output area 207 is directed in a wide direction. will spread to In this case, only the rays refracted at the first facet 211 of the prism array 203 among the rays output from the second object hologram image are directed toward the viewing direction of the viewer.

Meanwhile, when the first and second object hologram images are output through the first output area 205 and the second output area 207 of the first display 201, the sizes of the first and second object hologram images are small. will lose At this time, if the viewing area adjusting filter 209 is applied to the entire area of the first display 201, the second object hologram image is blocked and cannot be expressed, but the entire area of the first object hologram image can be used to display a large image. be able to express

The prism array 203 may be positioned in front of the first display 201 and inclined at a first angle 215 from the first display 201 .

The incident distance at which the light ray of the first object hologram image output from the first output area 205 of the first display 201 is incident on the prism array 203 is the light ray of the image output from the lower portion of the first output area 205. The first spatial projection image 217 corresponding to the first object hologram image is located at a point away from the prism array 203 by a first distance from the first display 201 at a predetermined angle (eg, a third angle) is formed. For example, the angle 215 between the first display 201 and the prism array 203 may be about 20 degrees. In this case, the angle between the first spatial projection image 217 and the first display 201 is It may be around 10 degrees.

On the other hand, in the case of the light rays of the second object hologram image output from the second output area 207 of the first display 201, since the incident distance to the prism array 203 is long, the second object hologram image corresponding to the second object hologram image The space projection image 219 is projected at a point separated from the prism array 203 by a second distance greater than the first distance. That is, the second spatial projection image 219 is projected as a virtual image behind the first spatial projection image 217 .

The incident path difference between the rays of the first object hologram image and the rays of the second object hologram image also causes a depth difference between the first spatial projection image 217 and the second spatial projection image 219 formed in space. Due to the occurrence of such a depth difference, the viewer feels a three-dimensional effect.

The second display 221 is located below the spatial image projection device 20 and can output a floor hologram image. The second display 221 may be composed of, for example, one of an LCD display capable of outputting a two-dimensional image, an OLED display, and a quantum dot display. In addition, the second display 221 may be configured as one of a 3D display including a parallax barrier capable of outputting a 3D image, a lenticular, and a prism array. Also, as shown in FIG. 4 , the second display 221 may be a display that outputs an image by illuminating an LED light on a pattern formed by laser processing of acrylic or the like.

The second display 221 is disposed in an inclined shape with the first display 201 at a second angle.

The second display 221 is disposed inclined at a predetermined angle (eg, an angle of 90°) from the prism array 203 in a form in which one surface of the second display 221 contacts the prism array 203 .

The third spatial projection image 223 corresponding to the floor hologram image output from the second display 221 is directed toward the top of the spatial image projection device 20 between the first display 201 and the prism array 203. can be projected to

For a moment, referring to FIG. 5 together, a first spatial projection image 217 corresponding to the first object holographic image and a second spatial projection image 219 corresponding to the second object holographic image on 3D coordinates are projected as spatial images. A third spatial projection image 223 having a different depth at the rear of the prism array 203 in the Z-axis (Longitudinal Axis) direction of the device 20 and corresponding to the floor hologram image is spaced perpendicular to the prism array 203. It has a specific height in the Y-axis (Vertical Axis) direction of the image projection device 20 .

Returning to FIGS. 2A and 2B , the prism array 203 may refract the light beam of the object hologram image output from the first display 201 and the light beam of the floor hologram image output from the second display 221 .

The prism array 203 may include a polarization filter on one surface of the prism array 203, and an internal reflection noise image may be removed through the polarization filter.

In general, looking at transmission and reflection when two materials with different refractive indices move light, the transmission coefficient and reflection coefficient of light having polarity perpendicular to each other on the incident surface are expressed by Equations 3 to 6 by the Fresnel equation. can be defined as

Internal reflection occurs when the refractive index of the incident medium is higher than the refractive index of the transmission medium when light passes through the prism array and comes out into the air.

이 성립하며 그 관계에 의해 S파의 반사 계수(R_s)는 항상 양수가 되고 임계각(Critical angle)

에 이르면 반사 계수는 1이 된다. 즉,

이므로

가 커짐에 따라 투과 광선은 점차적으로 경계선에 접근하고 그 만큼 점점 더 많은 에너지가 반사된다. 결론적으로는

이 되는 입사각이 바로 임계각이 된다. 즉, 입사각이 임계각보다 크거나 같은 경우 입사하는 모든 빛은 내부 전반사(Total internal reflection)가 일어나 모두 입사 매질로 즉, 프리즘 어레이로 되돌아간다. 내부 반사에서 임계각을 구하는 식은 수학식 7과 같다.In the case of internal reflection, according to Snell's law, always

is established, and by the relationship, the reflection coefficient (R _s ) of the S wave is always positive and the critical angle

, the reflection coefficient becomes 1. in other words,

Because of

As , the transmitted light gradually approaches the boundary line and more and more energy is reflected. In conclusion

This angle of incidence is the critical angle. That is, when the incident angle is greater than or equal to the critical angle, total internal reflection occurs for all incident light and returns to the incident medium, that is, to the prism array. The equation for obtaining the critical angle in internal reflection is Equation 7.

As confirmed by the critical angle, if the transmission coefficient and the reflection coefficient are calculated while increasing the incident angle, a specific angle at which the reflection coefficient with the P wave becomes 0 can be obtained. This specific angle is called Brewster's angle, and at that angle, all P waves are transmitted without reflected light. The equation for obtaining Brewster's angle in internal reflection is shown in Equation 8.

Accordingly, the traveling path of the light ray varies according to the incident angle incident on the prism array 203 . That is, the light rays output from the first display 201 and the second display 221 are totally reflected inside the prism array 203 and the light rays moving along a path determined to be directed toward the viewer's viewing direction, and heading to another path. made up of rays

Some of these light rays are reflected back from the rear surface of the prism array 203 and go through the prism array 203 toward the viewing direction of the viewer. In the case of a light ray incident at an angle having a high reflection coefficient and reflectance, noise is generated in a spatial projection image due to internal reflection of the prism array 203 .

To remove such internal reflection noise images, a polarization filter may be attached to the outside of the prism array 203 .

Looking at the components of the light rays coming out in the direction of the viewer's field of view, most of them are S-wave components according to the characteristics of the reflection coefficient. Therefore, filtering the components of the S wave can remove noise images due to internal reflection.

6 is a diagram for explaining a ray path of an object hologram image output from the first display 201 according to an embodiment of the present invention.

의 각도(601)로 기울어져 있고, 사용자(603)는 프리즘 어레이(203)의 전방으로부터 임의의 거리에 위치하여 프리즘 어레이(203)를

의 각도(605)로 보고 있다고 가정한다. 또한, 설명의 편의상 사용자(603)의 눈에서 광선이 나오는 것으로 가정하여 광 경로를 분석하기로 한다. Referring to FIG. 6, the first display 201 and the prism array 203

It is inclined at an angle 601 of , and the user 603 is positioned at an arbitrary distance from the front of the prism array 203 to form the prism array 203.

Assume that you are looking at an angle 605 of . In addition, for convenience of explanation, it is assumed that light rays come out of the eyes of the user 603 and the light path is analyzed.

프리즘으로 입사하고 프리즘의 입사면에서 굴절되어

진행하고 다시 프리즘의 출사면을

들어가게 된다. 이 광선은 프리즘의 출사면에서 다시 굴절되어

프리즘을 나가게 된다. 여기서 사용자(603)가 프리즘을 보는

수학식 9과 같은 관계를 갖는다.The rays from the eyes of the user 603 are

It enters the prism and is refracted on the incident surface of the prism.

and the exit surface of the prism again.

will enter This ray is refracted on the exit surface of the prism.

exit the prism. Here user 603 sees the prism

It has the same relationship as Equation 9.

프리즘의 출사면에서의

간의 관계는 굴절 법칙을 이용해 수학식 10과 같이 계산된다. In addition, at the incident surface of the prism

at the exit face of the prism

The relationship between them is calculated as shown in Equation 10 using the law of refraction.

In addition, a relationship such as Equation 11 is established through the triangular structure of the prism.

, 617)은 수학식 12와 같이 표현될 수 있다. In addition, the deflection angle, which is the difference between the total angle of incidence and the exit angle of the prism (

, 617) can be expressed as in Equation 12.

Therefore, when Equations 10 to 11 are substituted into Equation 12, the same result as Equation 13 can be obtained.

When the simulation for Equation 13 is performed, the simulation results shown in FIGS. 7A to 7E can be obtained.

FIG. 7A is a diagram showing the results of ray tracing simulation for each image output from the first display 201 and the second display 221 assuming that a ray comes out from the position of the eye of the user 603.

FIG. 7B is a diagram showing a result of performing ray tracing on the first object hologram image output from the first output area 205 of the first display 201 .

Referring to FIG. 7B , light rays output from the first output area 205 of the first display 201 are refracted through the second facet of the prism array 203 and directed to the user 603 .

Since the field of view adjusting filter 209 is attached to the first output region 205 of the first display 201, the light incident at a specific angle is filtered by the field of view adjusting filter 209.

A light ray passing through A3 of the prism among rays emitted from the position U of the eye of the user 603 is refracted by the prism and comes out to the position A2 of the prism and is directed to the position A1 of the first display 201 . That is, a ray emitted from A1 of the first display 201 passes through positions A2 and A3 of the prism and is directed to the eyes of the user 603 . At this time, since the user 603 recognizes that the light ray continues to travel straight, he feels that the light ray continues along the ray connecting A3 and U.

Therefore, the user 603 feels that there is an image at the location of A4, which is equal to the distance traveled from A1 to A2 to A3 in the direction connecting A3 and U.

Although the distance of A1 to A2 is expressed as smaller than the distance of A2 to A3, in the actual configuration, the thickness of the prism is in units of hundreds of microns, and the distance between the first display 201 and the prism array 203 is, for example, several tens of centimeters. Since the distance between the array 203 and the user 603 ranges from several tens of centimeters to several meters, the optical path length inside the prism becomes negligible.

Similarly, in the case of B1, which is the lowermost part of the first object hologram image, it is directed to the user 603 via B2 and B3, and the user 603 recognizes that it is from B4. Therefore, when the user 603 views the first object hologram images located in A1 to B1 through the prism array 203, the user 603 performs a first spatial projection corresponding to the first object hologram images A1 to B1. It is recognized that the images are located at positions A4 to B4 and are located on a different side from the first display 201 .

FIG. 7C is a diagram showing a result of performing ray tracing on the second object hologram image output from the second output area 207 of the first display 201. Referring to FIG.

Referring to FIG. 7C , among the rays emitted from C1, which is the upper end of the second object hologram image output from the second output area 207 of the first display 201, a ray directed to C2 of the prism array 203 is the prism incident surface. It is refracted from the inside of the prism and comes out through the exit surface C3 of the prism and is directed to the position U of the eye of the user 603.

When the user 603 sees this ray, it recognizes it as a ray coming from the direction connecting C3 to U, and perceives it as being behind the prism array 203 by the distance from C1 to C2 to C3. The user 603 recognizes that the light ray is emitted from the position of C4, and recognizes that the light ray emitted from D1 is emitted from D4.

When the user 603 views the second object hologram image located at C1 to D1 through the prism array 203, the user 603 displays the second space projection image corresponding to the second object hologram image on the display 201. It is recognized by the user 603 as being in the position of C4 to D4, which is behind the second output area 207 of . At this time, the second spatial projection image may be projected forward or backward of the second output region 207 according to the degree of the distance difference between the second output region 207 and the prism array 203 .

7D is a diagram showing a result of performing ray tracing on the floor hologram image output from the second display 221. Referring to FIG.

Referring to FIG. 7D , looking at the floor hologram image output from the second display 221, the ray emitted from the point E1 of the second display 221 is directed to the point E2 of the prism and continues to go out from the point E3 of the prism. The eyes of the user 603 are directed to position U. Accordingly, the user 603 recognizes that a light ray is emitted from a path connecting E3 to U.

The user 603 recognizes that F1 of the floor hologram image comes from the position of F4, and the third space projection image corresponding to the floor hologram image connecting E1 to F1 is E4 to E4 to the depth direction of the spatial image projection device 20. Recognize that it is in the position of F4.

7E shows the displayed images (first object hologram image, second object hologram image, and floor hologram image) in FIGS. 7B to 7D and spatial projection images (first space projection image, second space projection image) projected onto space. , a third spatial projection image).

Referring to FIG. 7E, since the first object hologram image and the second object hologram image are output from the first display 201, they exist on the same plane, and the floor hologram image has a certain angle with the prism array 203. Located.

When the user 603 views the first object hologram image, the second object hologram image, and the floor hologram image through the prism array 203, the first spatial projection image corresponding to the first object hologram image is displayed on the first display 201. , the second spatial projection image corresponding to the second object hologram image is projected to the rear of the first display 201, and the third spatial projection image corresponding to the floor hologram image is projected on the prism array 203 and can be projected in an almost perpendicular direction.

Therefore, a stereoscopic effect can be felt due to a difference in depth between the first spatial projection image and the second spatial projection image, and the stereoscopic effect can be improved by adding the third spatial projection image located in the depth direction.

8 is an exemplary diagram illustrating a spatial image projection result using a spatial image projection apparatus according to an embodiment of the present invention.

Referring to FIG. 8, as shown by reference numeral 805, a hologram image 801 including a first object hologram image and a second object hologram image through the first display in a state where the first display and the second display are installed at a specific angle. , and a floor hologram image 803 may be output through a second display located below the spatial image projection device.

In a state where the first display and the second display are installed at a specific angle, a prism array may be additionally installed in front of the inclined surface as shown in reference numeral 807 . When viewed through the prism array, the first object hologram image is refracted in the prism array and projected to the rear of the prism array, and the second object hologram image is at a certain distance from the first spatial projection image corresponding to the first object hologram image. projected

The floor hologram image is refracted in the prism array and projected onto the space. At this time, the installation angles of the first display, the second display, and the prism array may be adjusted so that the first spatial projection image, the second spatial projection image, and the third spatial projection image projected on the space are perpendicular to each other.

Also, by adjusting the projected position on the space, the first space projection image corresponding to the first object hologram image may appear to be standing on top of the third space projection image corresponding to the floor hologram image.

Through this, the first object hologram image can be expressed as if it is standing on the floor hologram image, and the effect of the hologram hologram is enhanced.

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. .

20: spatial image projection device
201: first display
221: second display
203: prism array

Claims (17)

In the spatial image projection device,
a first display outputting an object hologram image;
a second display located below the spatial image projection device and outputting a floor hologram image; and
A prism array located in front of the first display, inclined at a first angle with the first display, and refracting light rays of the object hologram image and the floor hologram image,
The first display includes a first output area outputting a first object holographic image and a second output area outputting a second object holographic image.
To include, a spatial image projection device.
According to claim 1,
The spatial image projection apparatus of claim 1 , wherein the second display is inclined at a second angle with respect to the first display.
According to claim 1,
The spatial image projection apparatus of claim 1 , wherein one surface of the second display contacts the prism array, and the second display is inclined at 90° with respect to the prism array.
According to claim 1,
A viewing area adjustment filter located in front of the first display and blocking light rays incident at an angle within a predetermined range among light rays of the object hologram image
To further include, the spatial image projection device.
delete According to claim 1,
The first output area is an upper area of the first display,
The spatial image projection apparatus of claim 1 , wherein the second output area is a lower area of the first display.
According to claim 1,
The spatial image projection apparatus of claim 1 , wherein the first output area is larger than the second output area.
According to claim 1,
A first spatial projection image corresponding to the first object hologram image is projected at a point separated by a first distance from the prism array;
The spatial image projection apparatus of claim 1 , wherein a second spatial projection image corresponding to the second object hologram image is projected at a point separated from the prism array by a second distance greater than the first distance.
According to claim 8,
The spatial image projection apparatus of claim 1 , wherein the first spatial projection image is inclined at a third angle with respect to the first display.
According to claim 8,
The spatial image projection apparatus of claim 1 , wherein a third spatial projection image corresponding to the floor hologram image is projected toward an upper portion of the spatial image projection apparatus between the first display and the prism array.
According to claim 1,
a viewing area adjustment filter located in front of the first output area and blocking light rays incident at an angle within a predetermined range among the rays of the first object hologram image;
To further include, the spatial image projection device.
According to claim 11,
The spatial image projection apparatus of claim 1 , wherein the viewing area adjustment filter includes a plurality of barriers extending in a transverse direction from a lower surface toward an upper surface.
According to claim 12,
Wherein the field of view 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,
A polarization filter located on one side of the prism array and removing an image with internal reflection noise
To further include, the spatial image projection device.
In the spatial image projection device,
a first display including a first output area outputting a first object hologram image and a second output area outputting a second object holographic image;
a second display located below the spatial image projection device and outputting a floor hologram image; and
A prism array located in front of the first display and refracting rays of the first object hologram image, the second object hologram image, and the floor hologram image
A spatial image projection device comprising a.
According to claim 15,
a viewing area adjustment filter located in front of the first output area and blocking light rays incident at an angle within a predetermined range among the rays of the first object hologram image;
To further include, the spatial image projection device.
According to claim 15,
A polarization filter located on one side of the prism array and removing an image with internal reflection noise
To further include, the spatial image projection device.

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