KR102290144B1 - Three-dimensional image projection apparatus - Google Patents

Abstract

The spatial image projection apparatus is positioned in front of a display and a display including a first output area for outputting a first holographic image and a second output area for outputting a second holographic image, and rays of the first holographic image and the second holographic image and a prism array that refracts the prism array, and the prism array is inclined at a first angle with the display.

Description

Spatial Image Projector {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 certain depth information to the 2D image. The 3D stereoscopic image display technology provides a 3D image by using the principle of human binocular disparity. According to the 3D stereoscopic image implementation method, since the images reflected by 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 an observer.

A method of separating left and right images using binocular disparity includes 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 includes a lenticular method, a parallax barrier method, an optical plate method, and the like. Here, the polarized glasses method and the shutter glasses method among the glasses methods are the oldest three-dimensional display methods and are widely used in stereoscopic movies, 3D TV, and the like. However, the polarized glasses method and the shutter glasses method have problems in that they have to wear special glasses for a stereoscopic image and increase eye fatigue. Among the glasses-free methods, the lenticular method and the parallax barrier method have a low luminance and low-resolution image, and the viewer's observation point is fixed, and has a disadvantage of causing a headache or dizziness during continuous observation of the viewer.

On the other hand, the full three-dimensional method includes a hologram and a volume-type three-dimensional display method. In this fully stereoscopic method, only a static stereoscopic image is implemented through an expensive laser and a precise optical device, and a high-definition stereoscopic image in real time is not provided.

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

As a solution to this problem, recently, a method of forming a stereoscopic 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.

Meanwhile, in order to improve the hologram effect in a prism array-based hologram device, a method of projecting a spatial projection image having a plurality of layers in space has been recently proposed. For a moment, a spatial image projection apparatus using a conventional dual display will be described with reference to FIG. 1 .

Referring to FIG. 1 , a conventional spatial image projection apparatus using a dual display includes a first display 100 for outputting a first holographic image, a second display 102 for outputting a second holographic image, and a prism array 104 . may include. The first display 100 is positioned at the lower rear of the prism array 104 at a first distance 106 from the prism array 104 , and the second display 102 is positioned at a second distance 108 from the prism array 104 . ) and located at the rear upper part of the prism array 104 .

The conventional spatial image projection apparatus using a dual display is a spatial projection image 110 corresponding to the first holographic image due to the difference in distance between the prism array 104 and the first display 100 and the second display 102 and the second display. 2 The spatial projection image 112 corresponding to the holographic image may be projected onto the space with different senses of depth.

In the case of a spatial image projection method having a double layer in a spatial image projection apparatus using such a conventional dual display, two displays are required, each display must be located at different depths, and the bezel thickness of the display must be considered. Therefore, there is a problem in that the overall system becomes large.

In order to solve this problem, a method of projecting a spatial projection image composed of a double layer using a single display has been proposed. For a moment, a spatial image projection apparatus using a conventional single display will be described with reference to FIG. 2 .

Referring to FIG. 2 , a conventional spatial image projection apparatus using a single display may include a display 200 and a prism array 202 . The display 200 is positioned rearwardly away from the prism array 202 by a predetermined distance 204 , and is horizontally disposed with the prism array 202 . The display 200 may be divided into a first region 206 for outputting a first holographic image and a second region 208 for outputting a second holographic image to have the same size to output different holographic images.

In the case of the conventional spatial image projection apparatus using a single display, when the observer looks at the spatial image projection apparatus from the front due to the configuration in which the display 200 and the prism array 202 are horizontally arranged, the first holographic image The first spatial projection image 208 corresponding to , and the second spatial projection image 210 corresponding to the second holographic image exist at the same depth, so that the first spatial projection image 208 and the second spatial projection image 210 ) cannot form a sense of depth, and only when looking down from above or looking up from below can a sense of depth be formed. In addition, when the viewer moves while viewing the first spatial projection image 208 and the second spatial projection image 210 , the depth of each image changes, and when a certain critical point is crossed, the depth of each image is reversed.

In addition, in the case of the conventional spatial image projection apparatus using a single display, since the display is divided into two regions of the same size and used, there is a problem in that the size of the spatial projection image projected on the space becomes small, and unnecessary images other than the predetermined viewing area are generated. There was a problem that the viewing area of the entire system was limited. In addition, since the depth of the system must be as deep as the height of the spatial projection image projected on the space, there is a problem in that the size of the entire system increases.

In order to solve this problem, a method of using an asymmetric prism array has been proposed, but there is a problem in that the spatial projection image looks tilted according to the position of the viewing area. Even in the case of a spatial image projection apparatus using an asymmetric prism array, since the display is divided into two regions and used, there is a problem in that the size of the spatial projection image projected onto the space becomes small. In addition, when the prism array is arranged horizontally and the distance between the display and the prism array is increased, when viewed from the left and right sides of the system, smile distortion occurs in which the spatially projected image rises or sinks, thereby limiting the effective viewing area on the left and right.

In this regard, Korean Patent No. 10-1365449 discloses a stereoscopic image display device for displaying a stereoscopic image.

It is intended to provide a double-layered spatial projection image using a prism array and a single display arranged at a predetermined angle. In addition, by making the area for outputting the first hologram image larger than the area for outputting the second hologram image on a single display, an existing problem in which a spatial projection image is projected to be small in space is to be solved. In addition, by arranging a viewing area control filter in front of an area for outputting the first holographic image of a single display, it is intended to block the light rays that interfere with a predetermined viewing area among the light rays of the first holographic image. However, the technical problems to be achieved by the present embodiment are not limited to the technical problems described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, the spatial image projection apparatus according to the first aspect of the present invention includes a first output area for outputting a first holographic image and a second output area for outputting a second holographic image display to; and a prism array positioned in front of the display and refracting light rays of the first holographic image and the second holographic image, wherein the prism array is inclined at a first angle to the display.

In an example, the display device may further include a viewing area control filter positioned in front of the first output area and blocking a light beam incident at a second angle among the light beams of the first holographic image. The viewing area control filter may include a plurality of barriers extending laterally between the upper surface and the lower surface. The plurality of barriers may protrude from the lower surface toward the upper surface in a vertical direction, and may be disposed at intervals along the longitudinal direction. The viewing area control filter may be configured to control the second angle by changing at least one of a height and an arrangement interval of the plurality of barriers.

In an example, the first holographic image may be an object image, and the second holographic image may be a background image.

In an example, the first output area may be larger than the second output area. The first output area may be an upper area of the display, and the second output area may be a lower area of the display.

In an example, the spatial projection image corresponding to the first holographic image is inclined at a third angle with respect to the display.

In one example, among the rays output from the first holographic image, a ray refracted by a first facet of the prism array is directed toward the viewer, and among the rays output from the second holographic image, the second prism array A ray refracted in the two facets may be directed in the direction of the viewer.

A spatial image projection apparatus according to a second aspect of the present invention comprises: a display unit including a first display outputting a first holographic image and a second display adjacent to the first display and outputting a second holographic image; and a prism array positioned in front of the display unit to refract light rays of the first holographic image and the second holographic image, wherein the prism array is inclined at a first angle to the display unit.

In an example, the display device may further include a viewing area control filter positioned on the front surface of any one of the first display and the second display and blocking a light beam incident at a second angle among the light beams of the first holographic image.

In an example, the first holographic image may be an object image, and the second holographic image may be a background image.

In an example, a height of the first display may be greater than a height of the second display.

In an example, the spatial projection image corresponding to the first holographic image is inclined at a third angle with respect to the display unit.

In one example, among the rays output from the first holographic image, a ray refracted by a first facet of the prism array is directed toward the viewer, and among the rays output from the second holographic image, the second prism array A ray refracted in the two facets may be directed in the direction of the viewer.

The above-described problem solving means are merely exemplary, 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 problem solving means of the present invention, it is possible to provide a double-layered spatial projection image using a single display disposed at a predetermined angle with the prism array. In addition, since only a single display provides a spatial projection image of a double layer, the size of the system can be reduced. In addition, since the region for outputting the first holographic image included in the single display is formed to be larger than the region for outputting the second hologram image, the spatial projection image (the spatial projection image corresponding to the first holographic image) is enlarged in space. can be projected. In addition, by disposing the viewing area control filter in front of the area for outputting the first holographic image of the single display, it is possible to block the light rays that interfere with the predetermined viewing area among the light rays of the first holographic image. Through this, the entire viewing area of the system can be enlarged, the overlapping problem of each spatial projection image formed by refracting light rays of the holographic images is solved, and a larger spatial projection image can be provided in a wide vertical viewing area.

1 is a view showing a spatial image projection apparatus using a conventional dual display.
2 is a view showing a spatial image projection apparatus using a conventional single display.
3 is a diagram for explaining a spatial image projection principle of a prism array.
4 is a view for explaining a chromatic aberration phenomenon occurring in a floating hologram system.
5 is a view for explaining a spatial image projection apparatus according to an embodiment of the present invention.
6A to 6C are diagrams for explaining a plurality of barriers used in a time region control filter according to an embodiment of the present invention.
7 is a diagram for explaining a method of correcting chromatic aberration according to an embodiment of the present invention.
8A to 8B are diagrams for explaining a spatial projection image projected through a spatial image projection apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 them. 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 "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "electrically connected" with another element interposed therebetween. . In addition, when a part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.

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

Hereinafter, detailed contents for carrying out the present invention will be described with reference to the accompanying configuration diagram or process flow diagram.

3 is a diagram for explaining a spatial image projection principle of a prism array.

Referring to FIG. 3 , among the rays of the holographic image output from the display 300 , the first rays 304 incident on the prism array 302 in the first direction are refracted by the prism array 302 . In this case, the viewer 306 may observe the stereoscopic image 308 projected as a virtual image behind the prism array 302 .

Meanwhile, a light ray 310 of the background image incident on the prism array 302 in the second direction from the real space is refracted by the prism array 302 and directed to the viewer 306 .

In other words, the first ray 304 output from the display 300 passes through the first facet 312 of the prism and is refracted, and the background ray 310 passes through the second facet 314 of the prism and is refracted. The stereoscopic image 308 and the actual background image are projected together.

4 is a view for explaining a chromatic aberration phenomenon occurring in a floating hologram system. Referring to FIG. 4 , when the first light ray 404 output from the display 400 passes through the prism array 402 , a light ray 406 of a red wavelength and a light ray of a green wavelength due to a difference in refractive index according to wavelengths The light rays 408 and 410 of the blue wavelength are dispersed to different positions to generate chromatic aberration of the floating hologram.

5 is a view for explaining a spatial image projection apparatus 50 according to an embodiment of the present invention.

Referring to FIG. 5 , the spatial image projection apparatus 50 may include a display 500 and a prism array 502 . However, since the spatial image projection apparatus 50 of FIG. 5 is only one embodiment of the present invention, the present invention is not limitedly interpreted through FIG. 5 , and is configured differently from FIG. 5 according to various embodiments of the present invention. could be

The display 500 may output a plurality of holographic images to the front of the spatial image projection apparatus 50 . Specifically, the display 500 may include a first output area 504 for outputting a first holographic image and a second output area 506 for outputting a second holographic image. Here, the first output area 504 of the display 500 may be set as the upper area of the display 500 , and the second output area 506 of the display 500 may be set as the lower area of the display 500 . there is. For example, by forming the height of the first output region 504 to be greater than the height of the second output region 506 , the spatial projection image corresponding to the first hologram image may be largely projected on the space.

The display 500 may variously adjust the height of the first output area 504 and the height of the second output area 506 according to the spatial projection image to be projected in a specific size.

The display 500 may output an object image as a first holographic image through the first output area 504 and output a background image as a second holographic image through the second output area 506 .

The display 500 may include one of a liquid crystal display (LCD) display capable of outputting a two-dimensional image, an organic light emitting diode (OLED) display, and a quantum dot display. For another example, the display 500 may include one of a 3D display including a parallax barrier, a lenticular lens, and a prism array capable of outputting a 3D image. . As another example, the display 500 may include an integrated image display capable of outputting a three-dimensional volumetric image, a hologram display, a rotating screen-based volumetric display, a multi-layered structure-based volumetric display, and the like.

The display 500 may include a viewing area control filter 508 capable of adjusting the viewing area on a front surface of the first output area 504 of the display 500 . Here, the viewing region control filter 508 may include a viewing region filter using a parallax barrier, a diffractive optical element (DOE), or a hologram optical element (HOE). In addition, the viewing area of the display may be adjusted by adding a viewing area adjustment optical system to the rear surface of the display 500 .

The viewing area control filter 508 blocks light rays incident at an angle (eg, a second angle) within a predetermined range among light rays of the first holographic image output from the first output area 504 of the display 500 in a wide direction. It can prevent light rays from scattering.

For example, the first ray of the first holographic image output from the first output region 504 of the display 500 (the ray incident at an angle other than the second angle) passes through the viewing area control filter 508, and the prism Although refracted in a second facet 512 of the array 502 to form a spatial projection image, a second light beam output in a different direction from the first light beam (a light beam incident at a second angle) is filtered through a field-of-view adjustment filter ( 508) is blocked.

For a moment, the time region control filter 508 will be described with reference to FIGS. 6A to 6C.

Referring to FIG. 6A , the viewing region control filter 508 includes an upper surface 601 and a lower surface 603 , and includes a plurality of barriers 611 extending laterally between the upper surface 601 and the lower surface 603 . can do.

The plurality of barriers 611 protrude from the lower surface 603 toward the upper surface 601 in a vertical direction, and may be disposed at intervals along the longitudinal direction when the viewer looks at the spatial image projecting apparatus 50 .

When the height 605 of the plurality of barriers 611 is P _h and the spacing 607 between the plurality of barriers 611 is P _w , the light beam of the holographic image that can pass through the field-of-view control filter 508 . The passing angle 609 of is equal to [Equation 1].

Referring to FIG. 6B , the viewing area control filter 508 may adjust the second angle at which light rays are blocked by changing at least one of the heights and spacing 607 of the plurality of barriers 611 . For example, reference numeral 613 denotes a first arrangement form of the plurality of barriers 611 , allowing only light rays within a specific angle of the light rays to pass through to view a stereoscopic image only in a specific direction.

In addition, reference numeral 615 denotes a second arrangement form of the plurality of barriers 611 , and by setting the height of the barrier 611 relatively high, a passage angle of light can be narrowly adjusted.

In addition, reference numeral 617 denotes a third arrangement form of the plurality of barriers 611 , and by setting the height of the barrier 611 low, the passage angle of the light beam can be adjusted widely. In addition, as indicated by reference numerals 619 and 621, by setting the spacing between the plurality of barriers 611 to be wide or narrow, the passing angle of the light beam can be adjusted to be wide or narrow.

_,)로 기울어진 시역 조절 필터(508)를 사용할 수 있다. Referring to FIG. 6C , the left and right viewing angles may differ depending on characteristics such as the angle between the display 500 and the prism array 502 and the prism vertex angle of the prism array 502 . As a method to solve this, a plurality of barriers 611 are formed at a predetermined angle (

_The viewing area adjustment filter 508 inclined to , ) may be used.

)로 기울어져 돌출되어 있으며, 시청자가 공간 영상 투영 장치(50)를 바라볼 때 종방향을 따라 간격을 두고 배치될 수 있다. Here, the plurality of barriers 611 are at a predetermined angle (

), and may be disposed at intervals along the longitudinal direction when the viewer looks at the spatial image projection apparatus 50 .

Since the plurality of barriers 611 are disposed in an inclined state, only light rays substantially parallel to each of the barriers 611 may pass through the viewing area control filter 508 .

라고 하면, 시역 조절 필터(508)를 통과하는 광선의 통과 각도 (609)는 [수학식 2]와 같다. An arrangement interval 607 of the plurality of barriers 611 is P _w , a height 605 is P _h , and an inclined angle of each barrier 611 is P w .

If , the passage angle 609 of the light beam passing through the viewing area control filter 508 is the same as [Equation 2].

)를 조절하여 광선의 출력 방향 및 통과 각도를 조절할 수 있게 된다.Therefore, the viewing area control filter 508 includes the height 605 of the plurality of barriers 611 , the arrangement interval 607 and the angle (the degree of inclination of the barrier 611 ,

) to control the output direction and passing angle of the light beam.

5 , the prism array 502 is positioned in front of the display 500 , and the first holographic image light beam output from the first output area 504 of the display 500 and the second prism array of the display 500 . The light beam of the second hologram image output from the second output area 506 may be refracted.

Among the light rays output from the first holographic image of the first output area 504 , the light rays incident on the prism array 502 in the first direction are refracted by the second facet 512 of the prism array 502 in the viewing direction of the viewer. is headed towards On the other hand, among the light rays output from the first hologram image, in the case of a light beam incident to the prism array 502 in a direction other than the first direction, total reflection or refracting occurs inside the prism array 502, and thus a direction different from the viewer's viewing direction. is headed towards

On the other hand, the field of view control filter 508 is not installed in the second output area 506 of the display 500, so that the light beam of the second hologram image output from the second output area 506 spreads in a wide direction. . In this case, only the light rays refracted by the first facet 510 of the prism array 502 are directed in the viewing direction of the viewer among the light rays output from the second hologram image.

The prism array 502 may be disposed to be inclined at a first angle 514 from the display 500 .

The incident distance at which the ray of the first holographic image output from the first output region 504 is incident on the prism array 502 increases as the ray of the image output from the lower portion of the first output region 504 increases, and the first hologram The spatial projection image 516 corresponding to the image is inclined at a third angle from the display 500 .

For example, the first angle 514 between the display 500 and the prism array 502 may be about 20 degrees, and in this case, the third angle may be about 10 degrees.

On the other hand, in the case of the ray of the second holographic image output from the second output area 506 of the display 500, since the incident distance to the prism array 502 is long, the spatial projection image 518 corresponding to the second holographic image is formed as a virtual image in the rear of the spatial projection image 516 corresponding to the first holographic image far away from the prism array 502 .

A difference in the incident path between the light beam of the first holographic image and the light beam of the second holographic image causes a depth difference between spatial projection images formed in space. Due to the occurrence of such a depth difference, the viewer feels a three-dimensional effect.

The distance at which the spatial projection image 516 corresponding to the first holographic image is projected from the prism array 502 may be derived through [Equation 3], and the spatial projection image 518 corresponding to the second holographic image is the prism The distance projected from the array 502 may be derived through [Equation 4].

는 디스플레이(500)의 제 1 출력 영역(504)에서 프리즘 어레이(502)로 입사되는 광선의 각도를 의미한다.Here, where D _f is the distance at which the spatial projection image 516 corresponding to the first holographic image is projected, d _s is the distance between the prism array 502 and the display 500,

denotes an angle of a ray incident on the prism array 502 from the first output area 504 of the display 500 .

은 디스플레이(500)의 제 2 출력 영역(506)에서 프리즘 어레이(502)로 입사되는 광선의 각도를 의미한다. where D _r is the distance at which the spatial projection image 518 corresponding to the second holographic image is projected, d _s is the distance between the prism array 502 and the display 500,

denotes an angle of a ray incident on the prism array 502 from the second output area 506 of the display 500 .

On the other hand, looking at the transmission and reflection when two materials with different refractive indices move light, the transmission and reflection coefficients of light having polarities perpendicular to each other on the incident surface are calculated from [Equation 5] to [Equation 5] by the Fresnel equation. It can be defined by Equation 8].

When light passes through the prism array 502 and comes out into the air, when the refractive index of the incident medium is higher than that of the transmission medium, internal reflection occurs.

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 9]와 같다.In case of internal reflection, Snell's law always

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

When , the reflection coefficient becomes 1. in other words,

Because of

As the ray increases, the transmitted ray gradually approaches the boundary line and more and more energy is reflected by it. In conclusion

The angle of incidence becomes the critical angle. That is, when the incident angle is greater than or equal to the critical angle, total internal reflection occurs and all incident light returns to the incident medium, that is, to the prism array. The formula for calculating the critical angle in internal reflection is [Equation 9].

As if checking the critical angle, if the transmission coefficient and 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 formula for calculating the Brewster angle from internal reflection is [Equation 10].

Accordingly, the propagation path of the light beam is changed according to the incident angle of the prism array 502 . That is, the light rays output from the display 500 are composed of light rays moving along a path determined to be directed toward the viewer's viewing direction and light rays being totally reflected inside the prism array 502 and directed to another path.

Some of these rays are reflected back from the rear surface of the prism array 502 and are directed toward the viewer's viewing direction through the prism array 502 . In the case of a ray incident at an angle having a high reflection coefficient and a high reflectance, noise is generated in the spatial projection image due to internal reflection of the prism array 502 .

In order to remove the internal reflection noise image, a polarization filter may be attached to the first facet 510 or the second facet 512 of the prism array 502 .

Looking at the components of the light rays coming out in the viewing direction of the viewer, most of the components of the S wave are based on the characteristics of the reflection coefficient. Therefore, by filtering the S wave component, the noise image due to internal reflection can be removed.

7 is a diagram for explaining a method of correcting chromatic aberration according to an embodiment of the present invention.

Referring to FIG. 7 , reference numeral 700 denotes a spatial projection image in which chromatic aberration is not corrected, and reference numeral 702 denotes a spatial projection image in which chromatic aberration is corrected. Comparing these two images, it can be seen that each color of RGB is shifted by a certain amount of pixels.

For example, as shown in FIG. 3 , when the display 300 and the prism array 302 are arranged to be parallel, the display 300 and the prism array 302 form a constant distance. In this case, since the amount of chromatic dispersion for the entire region is constant, the chromatic aberration can be corrected by applying inverse distortion by moving the number of pixels corresponding to the predetermined amount with respect to the entire image.

However, as shown in FIG. 5 , when the display 500 is installed to be inclined at a first angle 514 from the prism array 502 , a difference in distance between the display 500 and the prism array 502 is generated depending on the internal positions of the display 500 . do. As a result, there is a difference in the amount of pixel movement for correcting chromatic aberration.

At this time, since the distance between each area of the display 500 and the prism array 502 changes linearly according to each position of the display 500, the part that is the furthest and the part closest to the distance is selected, and the A pixel movement value may be calculated and linearly applied according to the position of the display 500 to obtain a pixel movement value for each part of the image. Chromatic aberration may be corrected by inverse distortion by moving pixels by the calculated pixel shift value.

In the image 704 , which is an enlarged left part of the spatial projection image 702 , it can be confirmed that many pixels have been moved, and the image 706 , which is an enlarged image 706 of the right part of the spatial projection image 702 , is the distance from the display 500 . Since is close, it can be seen that there are not many moved pixels.

8A to 8B are diagrams for explaining a spatial projection image projected through the spatial image projection apparatus 50 according to an embodiment of the present invention.

Referring to FIG. 8A , reference numeral 80 denotes an input image of the spatial image projection apparatus 50, and a first holographic image (eg, an object image) 800 is output through a first output area 810, A second holographic image (eg, a background image) 820 may be output to the second output area 830 . Here, the heights of the first output area 810 and the second output area 830 may be adjusted according to the characteristics of the system.

Referring to FIG. 8B , reference numeral 82 denotes an image in which the input image of reference numeral 80 is displayed through the spatial image projection apparatus 50 . A first spatial projection image 840 corresponding to the first holographic image 800 is formed in front, and a second spatial projection image 850 corresponding to the second holographic image 820 is formed in the first spatial projection image 840 . ), it can be seen that it is formed in the rear with a sense of distance.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains 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, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

50: spatial image projection device
500: display
502: prism array

Claims (16)

A spatial image projection apparatus comprising:
a display including a first output area for outputting a first holographic image and a second output area for outputting a second holographic image; and
A prism array positioned in front of the display and refracting light rays of the first holographic image and the second holographic image
including,
The prism array is inclined at a first angle with the display,
It is located only on the front surface of the first output area and further comprises a viewing area control filter for blocking the light rays incident at a second angle among the light rays of the first holographic image,
Wherein the viewing area control filter comprises a plurality of barriers extending in the transverse direction between the upper surface and the lower surface and disposed at intervals along the longitudinal direction, the spatial image projection apparatus.
delete delete delete The method of claim 1,
and the viewing area adjustment filter is configured to control the second angle by changing at least one of a height and an arrangement interval of the plurality of barriers.
The method of claim 1,
The first holographic image is an object image, and the second holographic image is a background image.
The method of claim 1,
The first output area is formed to be larger than the second output area, the spatial image projection apparatus.
The method of claim 1,
the first output area is an upper area of the display;
wherein the second output area is a lower area of the display.
The method of claim 1,
The spatial projection image corresponding to the first holographic image is inclined to have a third angle with the display, the spatial image projection apparatus.
The method of claim 1,
Among the light rays output from the first holographic image, the light rays refracted by the first facet of the prism array are directed in the direction of the viewer,
Among the rays output from the second holographic image, the ray refracted by the second facet of the prism array is directed in the direction of the viewer.
A spatial image projection apparatus comprising:
a display unit including a first display outputting a first holographic image and a second display adjacent to the first display and outputting a second holographic image;
A prism array positioned in front of the display unit and refracting light rays of the first holographic image and the second holographic image
including,
The prism array is inclined at a first angle with the display unit,
It is located only on the front surface of the first display and further comprises a viewing area control filter for blocking the light rays incident at a second angle among the light rays of the first holographic image,
Wherein the viewing region control filter comprises a plurality of barriers extending in the transverse direction between the upper surface and the lower surface and arranged at intervals along the longitudinal direction, the spatial image projection apparatus.
delete 12. The method of claim 11,
The first holographic image is an object image, and the second holographic image is a background image.
12. The method of claim 11,
The height of the first display will be formed larger than the height of the second display, the spatial image projection apparatus.
12. The method of claim 11,
The spatial projection image corresponding to the first holographic image is inclined at a third angle with the display unit, the spatial image projection apparatus.
12. The method of claim 11,
Among the light rays output from the first holographic image, the light rays refracted by the first facet of the prism array are directed in the direction of the viewer,
Among the rays output from the second holographic image, the ray refracted by the second facet of the prism array is directed in the direction of the viewer.

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