KR20180065582A - Three-dimentional projection apparatus - Google Patents

Abstract

Provided is a space image projection apparatus which comprises: a display panel outputting a hologram image to the front of the space image projection apparatus; a first prism array positioned in the front of the display panel, and refracting a beam of the hologram image to form a stereoscopic image corresponding to the hologram image; and a second prism array positioned in the back of the first prism array, and arranged in the opposite side of the first prism array to refract a background beam incident from the back of the space image projection apparatus. Therefore, chromatic dispersion of the background beam for a background image is corrected.

Description

{THREE-DIMENTIONAL PROJECTION APPARATUS}

The present invention relates to a spatial image projection apparatus.

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

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

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

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

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

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

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

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

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

A symmetrical first prism array and a second prism array are arranged in opposite directions to provide a stereoscopic image corresponding to a hologram image in harmony with a background image by correcting chromatic dispersion of a background light for a background image. It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided a spatial image projection apparatus comprising: a display panel for outputting a hologram image in front of a spatial image projection apparatus; A first prism array positioned in front of the display panel and refracting a light ray of the hologram image to form a stereoscopic image corresponding to the hologram image; And a second prism array located behind the first prism array and disposed in a direction opposite to the first prism array to refract a background light incident from behind the spatial image projection apparatus.

In an exemplary embodiment, the background light refracted through the second prism array is refracted through the first prism array disposed in a direction opposite to the second prism array, so that chromatic dispersion of the background image is corrected .

In an exemplary embodiment, the hologram image may be a rearranged image based on chromatic dispersion data of pixels of an original image output from the display panel.

For example, the chromatic dispersion data may include a first prism array, a second prism array, and a second prism array. The chromatic dispersion data may include red, green, and blue wavelengths of red, And the stereoscopic image may be formed by correcting chromatic dispersion of the original image through the first prism array and the hologram image.

In one example, the prism surface of the first prism array may be configured to face the front of the spatial image projection apparatus, and the prism surface of the second prism array may be configured to face the rear of the spatial image projection apparatus.

In one embodiment, the display panel and the first prism array may have a structure parallel to each other.

The display panel may be configured such that a lower portion of the display panel is inclined at a predetermined angle so as to face the first prism array.

For example, the second prism array may be disposed on the display panel.

In one example, the prism surface of the first prism array and the protrusions of the prism surface of the second prism array extend in the lateral direction of the spatial image projection apparatus. The prism surface of the first prism array and the protrusions of the prism surface of the second prism array extend in the longitudinal direction of the spatial image projection apparatus.

A spatial image projection apparatus according to a second aspect of the present invention includes: a display panel for outputting a hologram image in front of the spatial image projection apparatus; A first prism array positioned in front of the display panel and refracting a light ray of the hologram image to form a stereoscopic image corresponding to the hologram image in the spatial image projection apparatus; And a second prism array located behind the display panel and refracting a background light incident from behind the spatial image projection apparatus to form a background image in the spatial image projection apparatus.

In an exemplary embodiment, the background light refracted through the second prism array is refracted through the first prism array disposed in a direction opposite to the second prism array, so that chromatic dispersion of the background image is corrected .

In an exemplary embodiment, the hologram image may be a rearranged image based on chromatic dispersion data of pixels of an original image output from the display panel.

In one example, the prism surface of the first prism array may be configured to face the front of the spatial image projection apparatus, and the prism surface of the second prism array may be configured to face the rear of the spatial image projection apparatus.

In one embodiment, the display panel and the first prism array may have a structure parallel to each other.

The display panel may be configured such that a lower portion of the display panel is inclined at a predetermined angle so as to face the first prism array.

For example, the second prism array may be disposed on the display panel.

In one example, the prism surface of the first prism array and the protrusions of the prism surface of the second prism array may extend in the lateral direction of the spatial image projection apparatus. The prism surface of the first prism array and the protrusions of the prism surface of the second prism array may extend in the longitudinal direction of the spatial image projection apparatus.

The above-described task solution is 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 the detailed description of the invention.

According to any one of the above-described objects of the present invention, the symmetrical first prism array and the second prism array are arranged in the opposite directions, thereby correcting the chromatic dispersion of the background light on the background image, Dimensional image corresponding to the hologram image constituting the hologram image.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for explaining a spatial image projection principle of a prism array. FIG.
2 is a view for explaining a spatial image projection apparatus according to an embodiment of the present invention.
FIG. 3 is a diagram showing the installation structure of the prism array shown in FIG. 2 according to an embodiment of the present invention.
FIGS. 4A and 4B are views for explaining a comparison between a conventional spatial image projection apparatus and an image projected by the spatial image projection apparatus of the present invention.
5 is a view for explaining a spatial image projection apparatus according to another embodiment of the present invention.
FIG. 6 is a diagram showing the installation structure of the prism array shown in FIG. 5 according to an embodiment of the present invention
FIG. 7 is a diagram showing a result image projected by the spatial image projection apparatus shown in FIG. 5 according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating an image in which chromatic dispersion is corrected in the spatial image projection apparatus shown in FIG. 5 according to an embodiment of the present invention.

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

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for explaining a spatial image projection principle of a prism array. FIG. 1, a first ray 104 incident on a prism array 102 in a first direction among rays of a hologram image outputted from a display panel 100 is refracted by a prism array 102. At this time, the observer 106 can observe the stereoscopic image 108 projected in a virtual image on the rear side of the prism array 102.

On the other hand, the light rays 110 of the background image incident on the prism array 102 from the actual space in the second direction are refracted by the prism array 102 and directed toward the observer 106.

In other words, the first ray 104 output from the display panel 100 passes through the first facet 112 of the prism and is refracted, and the background ray 110 passes through the second facet 114 of the prism, So that the stereoscopic image 108 and the actual background image are projected together.

However, when the first light ray 104 of the hologram image outputted from the display panel 100 and the light ray 110 of the background image incident from the real space are refracted through the prism array 102, chromatic dispersion occurs.

Hereinafter, a method of projecting a stereoscopic image and a background image together by compensating the problem of chromatic dispersion either optically or optically and adjusting the optical path will be described.

2 is a view for explaining a spatial image projection apparatus 20 according to an embodiment of the present invention.

Referring to FIG. 2, the spatial image projection apparatus 20 may include a display panel 200, a first prism array 202, and a second prism array 204. However, since the spatial image projection apparatus 20 of FIG. 2 is only one embodiment of the present invention, the present invention is not limited to FIG. 2, .

The display panel 200 may output a hologram image in front of the spatial image projection apparatus 20. [ For example, the display panel 200 may include an LCD (Liquid Crystal Display) display, an OLED (Organic Light Emitting Diode) display, a Quantum Dot display, or the like capable of outputting a two-dimensional image. For example, the display panel 200 may be configured as one of a 3D display including a Parallax Barrier, a Lenticular Lens, and a Prism Array capable of outputting a three-dimensional image. For example, the display panel 200 may include an integrated image display capable of outputting a three-dimensional volumetric image, a holographic display, a volumetric display based on a rotating screen, and a volumetric display based on a multi-layer structure.

The first prism array 202 may be positioned in front of the display panel 200 and the prism surface 212 of the first prism array 202 may be oriented toward the front of the spatial image projection apparatus 20.

The first prism array 202 reflects a plurality of incident light beams toward the observer's viewing direction or the front surface of the first prism array 202 when the light ray 206 of the hologram image output from the display panel 200 is incident . The light ray 206 of the refracted hologram image can proceed parallel to the observer's viewing direction.

On the other hand, when the light beam 206 of the hologram image is refracted through the first prism array 202 or diffracted through the diffractive optical element (not shown), the difference in refractive indexes of the respective wavelengths (red wavelength, green wavelength and blue wavelength) The chromatic dispersion occurs because the red, green and blue wavelengths of each pixel of the hologram image are dispersed to different positions.

In order to solve this problem, the spatial image projection apparatus 20 generates the chromatic dispersion data for each pixel by matching the position information of each pixel of the original image with the position information of the red, green, and blue subpixels for each pixel And rearranges the subpixels for all the pixels based on the chromatic dispersion data of the pixels of the original image, thereby outputting the hologram image from which the chromatic dispersion is removed.

Here, the chromatic dispersion data of the pixel may be data representing the degree of refraction of the red, green, and blue light rays of each pixel of the original image through the first prism array 202. The chromatic dispersion data of the pixel may include a mapping table of position information of each pixel with respect to the original image and correction position information of sub pixels with respect to red, green, and blue of each pixel. The correction position information of the subpixels with respect to red, green, and blue of each pixel is obtained by passing the light of each pixel through the first prism array 202 for all the pixels of the original image output from the display, It is possible to indicate the degree of refraction by being dispersed by a ray of wavelength.

The first prism array 202 may refract the light ray 206 of the hologram image outputted from the display panel 200 and form a stereoscopic image 208 corresponding to the hologram image in the spatial image projection apparatus 20. Here, the hologram image is a rearranged image based on the chromatic dispersion data of the pixels of the original image output from the display panel 200, and the hologram image passes through the first prism array 202 And may be an image formed by correcting chromatic dispersion of an image.

The second prism array 204 is disposed on the top of the display panel 200 and is located behind the first prism array 202. The second prism array 204 may be disposed in a direction opposite to the first prism array 202 to refract the background light incident from the rear of the spatial image projection apparatus 20. That is, the prism surface 214 of the second prism array 204 may be configured to face the rear of the spatial image projection apparatus 20.

The first prism array 202 and the second prism array 204 may refract the background rays 210 incident from behind the spatial image projection apparatus 20 to form a background image in the spatial image projection apparatus 20. [ have. The refracted background rays 210 may proceed parallel to the viewer's viewing direction.

At this time, since the background ray 210 is a light ray that is reflected and incident on the actual space, it is impossible to correct the background ray 210 as a method of correcting the chromatic dispersion of the hologram image according to the chromatic dispersion data of the pixel. Therefore, in order to solve the chromatic dispersion problem for the background image, the background rays 210 refracted through the second prism array 204 are divided into a first prism array (the first prism array) 202 to correct the chromatic dispersion of the background image.

This is because the first prism array 202 and the second prism array 204 are symmetrically arranged in opposite directions to each other and the vertex angles of the respective prisms are the same. The amount of chromatic dispersion of the array 204 becomes equal so that the chromatic dispersion of the background rays 210 passing through the two prism arrays can be compensated for each other.

3, the protrusions of the prism surface 212 of the first prism array 202 and the prism surface 214 of the second prism array 204 extend in the lateral direction of the spatial image projection apparatus 20 So that the spatial image projection apparatus 20 can be constructed.

FIGS. 4A and 4B are views for explaining a comparison between a conventional spatial image projection apparatus and an image projected by the spatial image projection apparatus of the present invention.

4A, a conventional spatial image projection apparatus 401 in which only one prism array is installed illuminates the ceiling light as it is due to the background rays incident in the upper direction of the prism array, And the background image can not be projected.

4B, the spatial image projection apparatus 20 of the present invention including the first prism array 202 and the second prism array 204 is not affected by illumination in the ceiling, And the actual background image 405 can be provided together.

5 is a diagram for explaining a spatial image projection apparatus 20 according to another embodiment of the present invention. Referring to FIG. 5, the spatial image projection apparatus 20 is configured such that the lower portion of the display panel 200 shown in FIG. 2 is inclined at a predetermined angle to face the first prism array 202.

2, the stereoscopic image 208 formed in the spatial image projection apparatus 20 is positioned at an upper portion of the display panel 200 and is projected at a considerable distance from the first prism array 202, There is a problem that the effect becomes poor. This is because the display panel 200 and the first prism array 202 are parallel to each other and are spaced apart by a certain distance. The stereoscopic image is projected at a considerable distance from the first prism array 202. The size of the display panel 200 and the spatial image projection apparatus 20 increases as the size of the required stereoscopic image is increased. The stereoscopic image projected in the spatial image projection apparatus 20 is displayed on the first prism array 202, As shown in FIG.

Referring to FIG. 5 again, the spatial image projection apparatus 20 includes a first prism array 202 and a second prism array 204 in a structure as shown in FIG. 2, The first prism array 202 or the second prism array 204 and the display panel 200 may have a predetermined angle.

Accordingly, the stereoscopic image 208 corresponding to the hologram image formed in the spatial image projection apparatus 20 is inclined at an angle with the first prism array 202, but is significantly ahead of the stereoscopic image 208 of FIG. 2 As shown in FIG.

However, in such a structure, a path difference occurs between the position of the display panel 200 and the position of the first prism array 202, so that the stereoscopic image 208 appears to be tilted back and forth. 6, a prism surface of the first prism array 202 and a prism surface of the second prism array 204 are extended in the lateral direction of the spatial image projection apparatus 20 Can be configured. With this configuration, the stereoscopic image 208 projected on the space of the spatial image projection apparatus 20 can be expressed as an image that stands in the vertical direction correctly.

FIG. 7 is a diagram showing a result image projected by the spatial image projection apparatus 20 shown in FIG. 5 according to an embodiment of the present invention.

7, when a ray of the hologram image is output through the display panel 200 in a state where the physical object 700 corresponding to the background image is disposed behind the spatial image projection apparatus 20, The light rays of the hologram image refracted by the array 202 form a stereoscopic image 702 in the spatial image projection apparatus 20 and the light rays of the physical object 700 refracted by the second prism array 204 Refracted in the first prism array 202 to form a background image 700 behind the stereoscopic image 702. [

FIG. 8 is a diagram showing an image in which chromatic dispersion is corrected in the spatial image projection apparatus 20 shown in FIG. 5 according to an embodiment of the present invention.

8, when the display panel 200 is inclined at a predetermined angle from the first prism array 202, the distance between the display panel 200 and the first prism array 202 There will be a difference. This causes a difference in the pixel shift amount for chromatic dispersion correction.

At this time, the left portion of the display panel 200 of the spatial image projection apparatus 20 is farther from the first prism array 202 than the right portion. Therefore, it is necessary to make the chromatic dispersion correction amount for the left part larger than the chromatic dispersion correction amount for the right part.

It can be confirmed that a large number of pixels are moved in the image 801 obtained by enlarging the left portion of the stereoscopic image 702 and the image 803 enlarged to the right portion of the stereoscopic image 702 is displayed on the display panel 200 It can be confirmed that there are not many pixels moved.

Here, since the distance between each part of the display panel 200 and the first prism array 202 changes linearly with each position of the display panel 200, the pixel shift value closest to the pixel shift value of the furthest part, , And then linearly applying it to obtain the pixel shift value for each portion of the image.

One embodiment of the present invention may also be embodied in the form of a recording medium including instructions executable by a computer, such as program modules, being executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer readable medium may include both computer storage media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

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

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

20: Spatial image projection device
200: Display panel
202: first prism array
204: second prism array

Claims (19)

A spatial image projection apparatus comprising:
A display panel for outputting a hologram image in front of the spatial image projection apparatus;
A first prism array positioned in front of the display panel and refracting a light ray of the hologram image to form a stereoscopic image corresponding to the hologram image; And
A second prism array disposed behind the first prism array and disposed in a direction opposite to the first prism array to refract a background light incident from behind the spatial image projection apparatus,
The spatial projection imaging device comprising:
The method according to claim 1,
Wherein the background light refracted through the second prism array passes through the first prism array arranged in a direction opposite to the second prism array and is refracted to correct chromatic dispersion for the background image. Projection imaging device.
The method according to claim 1,
Wherein the hologram image is a rearranged image based on chromatic dispersion data of pixels of an original image outputted from the display panel.
The method of claim 3,
Wherein the chromatic dispersion data indicates the degree to which the red (R), green (G), and blue (B) wavelength light rays of each pixel of the original image pass through the first prism array and are refracted Data,
Wherein the stereoscopic image is formed by passing the hologram image through the first prism array and correcting chromatic dispersion of the original image.
The method according to claim 1,
Wherein the prism surface of the first prism array is configured to face the front of the spatial image projection apparatus and the prism surface of the second prism array is configured to face the rear of the spatial image projection apparatus. .
The method according to claim 1,
Wherein the display panel and the first prism array have a structure parallel to each other.
The method according to claim 1,
Wherein the display panel is configured to tilt at a predetermined angle such that the bottom of the display panel faces the first prism array.
The method according to claim 1,
Wherein the second prism array is disposed on top of the display panel.
The method according to claim 1,
Wherein a prism surface of the first prism array and a protrusion of a prism surface of the second prism array extend in the lateral direction of the spatial image projection apparatus.
The method according to claim 1,
Wherein a prism surface of the first prism array and a protrusion of a prism surface of the second prism array extend in the longitudinal direction of the spatial image projection apparatus.
A spatial image projection apparatus comprising:
A display panel for outputting a hologram image in front of the spatial image projection apparatus;
A first prism array positioned in front of the display panel and refracting a light ray of the hologram image to form a stereoscopic image corresponding to the hologram image in the spatial image projection apparatus; And
And a second prism array disposed behind the display panel and forming a background image in the spatial image projection apparatus by refracting a background ray incident from behind the spatial image projection apparatus,
The spatial projection imaging device comprising:
12. The method of claim 11,
Wherein the background light refracted through the second prism array passes through the first prism array arranged in a direction opposite to the second prism array and is refracted to correct chromatic dispersion for the background image. Projection imaging device.
12. The method of claim 11,
Wherein the hologram image is a rearranged image based on chromatic dispersion data of pixels of an original image outputted from the display panel.
12. The method of claim 11,
Wherein the prism surface of the first prism array is configured to face the front of the spatial image projection apparatus and the prism surface of the second prism array is configured to face the rear of the spatial image projection apparatus. .
12. The method of claim 11,
Wherein the display panel and the first prism array have a structure parallel to each other.
12. The method of claim 11,
Wherein the display panel is configured to tilt at a predetermined angle such that the bottom of the display panel faces the first prism array.
12. The method of claim 11,
Wherein the second prism array is disposed on top of the display panel.
12. The method of claim 11,
Wherein a prism surface of the first prism array and a protrusion of a prism surface of the second prism array extend in the lateral direction of the spatial image projection apparatus.
12. The method of claim 11,
Wherein a prism surface of the first prism array and a protrusion of a prism surface of the second prism array extend in the longitudinal direction of the spatial image projection apparatus.

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