WO2019245067A1

WO2019245067A1 - Holographic optical device and holographic display device

Info

Publication number: WO2019245067A1
Application number: PCT/KR2018/006926
Authority: WO
Inventors: 김은수; 박경태
Original assignee: 광운대학교 산학협력단
Priority date: 2018-06-19
Filing date: 2018-06-19
Publication date: 2019-12-26

Abstract

A holographic optical device and a holographic display device, presented in the present invention, comprise: a holographic optical element comprising a holographic pattern recorded as a transmissive type or reflective type by using the interference of object light and reference light such that a background image projected from a background image projection unit is generated in a space; and a mirror array for reflecting light that is incident from a display unit such that the background image and an object image having a predetermined angle with the background image are generated in the space. The presented holographic optical device and holographic display device can simultaneously generate both the object image and the background image in the space such that vivid images can be provided to viewers.

Description

Holographic optics and holographic display devices

The present invention relates to a holographic optical device and a holographic display device. More particularly, the present invention relates to a holographic optical device and a holographic display device using a transmissive or reflective holographic optical element. This study corresponds to the Holo-Digilog Human Media Research Center project conducted with the support of the Korea Research Foundation in 2018 (No. 2011-0030079).

Today, advertising and public relations account for a large portion of sales of products. Therefore, in recent years, there has been a surge in interest in advertisements for playing these images in a limited space with images mounted on display devices in addition to advertisements using mass-media such as television or radio.

For example, installing a display device such as a liquid crystal display (LCD), a projection TV, or a light emitting display (LED) in a building such as a large store or on a busy street, and playing the advertisement contents through the display is possible. This corresponds.

However, it takes a lot of money to operate such a display device, there is a problem of low advertising efficiency due to the restrictions of the place. In addition, due to the weight of the display device and the heat generated from the display device itself, there is a problem that it is difficult to install without the auxiliary mechanism.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and uses a holographic optical element in which a hologram pattern is formed according to a transmissive or reflective hologram recording method based on multiple diverging object light and reference light, and reflects light. An object of the present invention is to propose a holographic optical device and a holographic display device for generating an image in a space using a mirror.

However, the object of the present invention is not limited to the above-mentioned matters, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, a holographic optical device includes a holographic optical element in the form of a film for plotting a background image; And a mirror array positioned on one surface of the holographic optical element and generating an object image having a predetermined angle with the floated background image.

The holographic optical element includes a base film; And a hologram pattern formed on the base film based on the interference between the multi-diffusing object light and the reference light.

The object light may multiply through a prism sheet for condensing the object light, a lens sheet, a diffusion plate for diffusing the object light all over one surface of the holographic optical element, or a combination thereof.

The hologram pattern may be changed in shape by adjusting the uniformity of light efficiency according to the distance traveled by the object light through the diffusion plate spaced apart from the base film to reach the holographic optical element.

The hologram pattern may be a first hologram pattern in which the reference light is incident on the holographic optical element without passing through all of the prism sheet, the lens sheet, and the diffusion plate.

The hologram pattern may be a second hologram pattern in which the reference light is transmitted through the prism sheet, the lens sheet, the diffusion plate, or a combination thereof, and the transmitted reference light is incident on the holographic optical element.

The hologram pattern is the object light is incident on one side of the holographic optical element, the reference light is the light reflected by the reflector of the pre-designed structure by passing the object light through the holographic optical element, the reference light is the It may be a third hologram pattern formed by being incident on the other side of the holographic optical device.

It may further include a transparent element formed of a transparent material and positioned on the other surface of the mirror array.

In accordance with an aspect of the present invention, there is provided a holographic display device comprising: a holographic optical device; A background image projector for projecting a background image onto the holographic optical device; And a display unit for injecting light into the holographic optical device to generate an object image in space, wherein the holographic optical device comprises a holographic optical element in the form of a film that floats the projected background image. Elements); And a mirror array positioned on one surface of the holographic optical element and reflecting the light incident from the display unit to generate the object image having a predetermined angle with the floated background image.

The display unit may include an organic compound film to emit light by itself in response to an electric current.

The display unit includes a backlight for generating light, and the light generated from the backlight passes through a liquid crystal whose molecular arrangement is manipulated by an external electric field, and the propagation direction of the transmitted light is polarized in a preset direction so that the holographic optical device Can be made to enter.

And a support unit for arranging the holographic optical device at a predetermined angle with the display unit so that the object image is generated in a predetermined direction in space.

The present invention can achieve the following effects through the configuration for achieving the above object.

First, a live image may be provided to viewers by simultaneously generating a background image as well as an object image in a space.

Second, the light efficiency is high and the brightness is high.

Third, color dispersion is eliminated, making it possible to implement white at all viewing angles (FOV).

Fourth, full color expression is possible.

Fifth, the projection angle range of the projector can be extended than before.

Sixth, the image observation is free from the light transmitted directly.

Effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a cross-sectional view showing a detailed structure of a holographic optical device according to an embodiment of the present invention.

2A and 2B are reference diagrams illustrating an incident form of an object light and a reference light used to generate a holographic optical device according to an exemplary embodiment.

3 is an exemplary view illustrating a method of generating a holographic optical device according to an embodiment of the present invention.

4 is an exemplary diagram illustrating a second embodiment for describing a method of generating a holographic optical device according to an exemplary embodiment.

5 is a cross-sectional view illustrating an internal structure of a holographic optical device according to a third embodiment of the present invention.

6A and 6B are reference diagrams illustrating an incident form of an object light and a reference light used to generate a holographic optical device according to a third exemplary embodiment of the present invention.

7 is a conceptual diagram illustrating a method of manufacturing a holographic optical device according to a third exemplary embodiment of the present invention.

8 is a conceptual diagram illustrating a holographic display apparatus including a holographic optical apparatus according to an exemplary embodiment.

FIG. 9 is a conceptual diagram illustrating a holographic display apparatus including a holographic optical apparatus according to another exemplary embodiment.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention; Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms. The embodiments of the present invention make the posting of the present invention complete and the general knowledge in the technical field to which the present invention belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. In addition, the terms defined in the commonly used dictionaries are not ideally or excessively interpreted unless they are specifically defined clearly.

When a component is referred to herein as being "connected" to another component, it should be understood that there may be a direct connection to that other component, but there may be other components in between. On the other hand, when a component is referred to as being "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

In the present specification, terms such as “first” and “second” are used to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, the first component may be named a second component, and similarly, the second component may also be named a first component.

In the present specification, for each step, an identification code (eg, a, b, c, etc.) is used for convenience of description, and the identification code does not describe the order of each step, and each step is clearly contextual. Unless stated in a particular order, it may occur differently from the stated order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

In this specification, expressions such as “having”, “may have”, “comprises” or “may contain” refer to the presence of such features (eg, numerical, functional, operational, or component such as components). It does not exclude the presence of additional features.

In addition, the terms "... unit", "... unit", "module", "block", and the like described herein refer to a unit for processing at least one function or operation, which may be hardware or software. It can be implemented in a combination of hardware and software.

Recently, a method of forming a projection screen in the form of a sheet and advertising content on the screen has been expanded by using an advertisement technique differentiated from an advertisement using mass media. For example, this method attaches a rear projection film to the back of a store window and projects an advertisement image onto the transmissive film from a beam projector installed in the store so that viewers outside the store can view the image projected from the beam projector through the window. It is provided for viewing.

Transparent projection screens can be applied to a wide range of applications, one of which is applied to interactive shop windows. So-called holscreens are being used to project information onto the screen while allowing viewing of objects behind the screen. Holoscreens, however, are opaque and have the problem of obstructing the visibility of objects behind the show window. In addition, even when the image is projected on the holo screens using a beam projector, viewers are only provided with the image on the holo screens, it is difficult to provide a more vivid image.

In the present invention, the holographic optical device and the holographic display device will be described in detail with reference to the accompanying drawings.

According to FIG. 1, the holographic optical device 100 includes a mirror array 110 and a holographic optical element 120.

The mirror array 110 according to an embodiment of the present invention may be located on one surface of the holographic optical device 120, and an object image having a predetermined angle with a background image plotted at the holographic optical device 120 may have a predetermined angle. Can be generated. In addition, the mirror array 110 according to an embodiment of the present invention may be arranged in a predetermined direction to generate an object image having a predetermined angle with the floated background image.

The mirror array 110 according to an embodiment of the present invention has a background that is floated in space using a retro reflection effect that reflects incident light such that the direction in which light is incident and the direction in which the incident light is reflected are the same. An object image having a predetermined angle with the image may be plotted in space.

The mirror array 110 according to an embodiment of the present invention may include a structure in which a plurality of micro mirrors are arranged. Each of the plurality of micromirrors may have a shape such as a rectangle, a triangle, a circle, and the like, but is not limited thereto. In addition, the mirror array 110 according to an embodiment of the present invention may be implemented as an aluminum plate capable of four-side reflection, but the above-described example is only an example for describing an embodiment of the present invention. no.

The holographic optical element 120 may be configured as a diffraction plate including volume diffraction elements diffracted in a previously designed direction, and may transmit and diffract light having different wavelength bands in the same direction.

The holographic optical device 120 according to an embodiment of the present invention may be formed in a single layer and stacked on the bottom surface of the mirror array 110, and may have a film shape for floating a background image. The holographic optical device 120 may be formed as a single layer and stacked on an upper surface of the mirror array 110.

According to another embodiment of the present invention, the holographic optical device 100 may include a transparent element stacked on the other surface of the mirror array 110 described above. The transparent element is in the form of a plate, and may be formed of a transparent material as a material, and may be stacked on an upper surface of the mirror array 110. For example, the transparent element may be formed in the form of a transparent glass plate made of a glass component as a material, but is not limited thereto. It is also possible to use a material such as an acrylic plate, which is another element formed transparently instead of the glass plate.

The holographic optical device 120 according to another embodiment of the present invention may be stacked on the bottom surface of the mirror array 110 by using a lamination method. The above-described example is only an example for describing an embodiment of the present invention, and the holographic optical device 120 may be formed in a single layer and stacked on the top surface of the mirror array 110. The holographic optical device 100 may further include a coating layer (not shown). In addition, when the holographic optical device 120 is stacked on the bottom of the mirror array 110, the coating layer may be stacked on the top surface of the mirror array 110. The coating layer may be formed of an anti-reflection (AR) coating layer.

The holographic optical element 120 may be generated by forming a pattern on a volume holographic optical element (VHOE) film using a transmissive or reflective hologram recording method. In detail, the holographic optical device 120 according to the exemplary embodiment may include a base film 120a and a hologram pattern 120b formed on the base film 120a. When the hologram pattern 120b is exposed according to the interference pattern by the object light and the reference light, a monomer is combined with a functional group and polymerized to form a specific shape. The shape of the hologram pattern 120b shown in FIG. 1 is merely an example, and the shape of the hologram pattern 120b is not limited thereto. A detailed description of the transmission hologram recording method will be given later with reference to FIGS. 2 to 4. A detailed description of the reflective hologram recording method will be described later with reference to FIGS. 5 to 7.

The holographic optical element 120 may be generated by recording on the VHOE film using multiple divergent beams having a wide angle as object light. In detail, the holographic optical device 120 may be generated by dispersing and diffracting respective color lights such as R, G, and B on the VHOE film using white light as an ambient light source. In addition, the holographic optical device 120 may be generated as a device that performs a transparent screen function by allowing the scattered and diffracted color lights to overlap and diverge. Therefore, when the holographic optical device 120 is used, transparency can be secured and the background image can be floated on the space.

The holographic optical device 120 may be generated by sequentially transmitting red light, green light, blue light, etc. in a predetermined order so as to perform a transparent screen function even when light of any wavelength band is incident. Where red light represents light having a wavelength band associated with red (R), green light represents light having a wavelength band associated with green (G), and blue light represents light having a wavelength band associated with blue (B). Indicates.

For example, the holographic optical device 120 may be generated as a device capable of performing a transparent screen function in the following order.

First, red light is transmitted to the first surface of the holographic optical device 120 at a first angle. Then, the first dispersion and diffraction are reflected on the holographic optical device 120 by the red light.

The first angle may be determined based on an angle between the object light and the reference light. The angle of incidence of the object light may be determined based on a viewing angle of the viewer looking at the holographic optical device 100. In addition, the incident angle of the reference light may be determined based on the incident angle of the light projected onto the holographic optical device 100. In the present invention, the first angle may be determined based on the incident angle of the object light and the incident angle of the reference light.

Thereafter, green light is transmitted at a second angle with respect to the same surface of the holographic optical device 120. Secondary dispersion and diffraction are then reflected on the holographic optical element 120 by red light followed by green light.

Lights having different wavelength bands form different diffraction angles when passing through the holographic optical device 100. In view of this point, in the present invention, the second angle can be determined based on the optical diffraction angle unique to each wavelength. Since the second angle is related to the diffraction angle for each wavelength, the second angle should be minimized in order for the holographic optical device 100 to have a wider viewing angle than in the related art. Therefore, the second angle is preferably formed at an angle much smaller than the first angle.

On the other hand, the wavelength band of green light is closer to the wavelength band of red light than the wavelength band of blue light. According to an embodiment of the present invention, in consideration of the color dispersion law indicating that light propagates due to different propagation speeds of wavelength components traveling in a medium, a second angle obtained by subtracting a predetermined angle from the first angle is determined by green light. It is used as the incident angle. However, the above-described example is only an example for describing an embodiment of the present invention and is not limited thereto.

Thereafter, blue light is transmitted at a third angle with respect to the same surface of the holographic optical device 120. The third order dispersion and diffraction is then reflected on the holographic optical element 120 by red light and green light followed by blue light.

The third angle may be determined based on an optical diffraction angle unique to each wavelength, like the second angle. Like the third angle and the second angle, it is preferable to form an angle much smaller than the first angle.

Meanwhile, the wavelength band of blue light is closer to the wavelength band of green light than the wavelength band of red light. According to an embodiment of the present invention, in consideration of the law of color dispersion, the same angle as the second angle is used as the third angle, or the blue light is used as the incident angle of blue light, or the angle added or subtracted from the second angle is the third angle. It can be used as the incident angle of light. However, the above-described example is only an example for describing an embodiment of the present invention and is not limited thereto.

Meanwhile, if the holographic optical device 120 can effectively perform the transparent screen function, the holographic optical device 120 may be generated using light related to other colors in addition to red light, green light, blue light, and the like.

Meanwhile, the holographic optical device 120 may be generated in the following manner when manufactured in a large size.

First, the holographic optical element 120 may be generated by recording in a large area using divergent object light and divergent reference light.

Second, the holographic optical device 120 may be generated by a multiple recording method using a masking technique and a shifting technique.

Third, the holographic optical element 120 may be created by recording in large area using a tiling technique.

Meanwhile, the holographic optical device 120 according to an exemplary embodiment of the present invention is sealed by using either a thermal compression method or an adhesive compression method before it is stacked on the bottom surface of the mirror array 110. Can be processed. According to an exemplary embodiment of the present invention, the holographic optical device 120 may be prevented from being deteriorated through the above-described sealing process, and the holographic optical device 120 may be protected from the external environment.

When performing the transparent screen function, the holographic optical device 120 may increase an incident angle difference between lights having different wavelength bands in order to secure a wide field of view (FOV). Conventional viewing angles are based on the viewing angle of a typical scattering white screen. The above-mentioned 'wide viewing angle' represents a relatively wider viewing angle than this conventional viewing angle.

According to an embodiment of the present invention, the holographic optical device 120 may be generated by recording on the VHOE film by using the interference between the object beam and the reference beam. The shape of the object light and the reference light used to generate the holographic optical element 120 may be designed with the following points in mind.

(1) The shape of the object light is designed to maximize the diffraction efficiency of the incident color light and to ensure an optimized wide field of view (FOV). To this end, the object light can be designed as follows.

First, the object light can be designed as a beam that forms an overall uniform intensity distribution.

Second, the object light may be designed as a beam having a scattering angle associated with a viewing angle of a general white screen.

Third, the object light may be designed as a beam having a light intensity of maximum efficiency.

(2) Design the shape of the reference light so as to obtain an optimized light efficiency for acting as a transparent screen for the projected light. For this purpose, the reference light may be designed as follows.

First, the reference light may be designed as a beam having a screen shape having a desired size and ratio, and forming an overall uniform intensity distribution.

Second, the reference light may be designed as a beam having a light intensity of maximum efficiency.

The object light 210 is incident on the holographic optical element 120 in the form of diverging light as shown in FIGS. 2A and 2B. On the other hand, the reference light 220 is incident on the holographic optical element 120 in the form of parallel light as shown in FIG. 2A, or is incident on the holographic optical element 120 in the form of light diverging as shown in FIG. 2B. Can be. In the present invention, in order to obtain a wider viewing angle, it is preferable to enter the holographic optical element 120 in the form of light that emits not only the object light 210 but also the reference light 220.

The holographic optical device 120 may be generated using a lens sheet, a prism sheet, a light diffusion plate, or the like to obtain an optimized wide viewing angle (FOV). This will be described below.

In the present specification, the holographic optical device including the first holographic optical element is referred to as a first holographic optical device.

First, the object light 210 is incident on the prism sheet 310, the lens sheet 320, the diffusion plate 330, etc. sequentially (STEP A).

Thereafter, the object light 210 and the prism sheet 310, the lens sheet 320, and the diffusion plate 330 that pass through the prism sheet 310, the lens sheet 320, and the diffusion plate 330 in order do not pass through. Non-reference light 220 is incident on the first holographic optical element 131 at the same time (STEP B).

The object light 210 may be incident on the first holographic optical element 131 in the form of a beam that multiplies through the prism sheet 310, the lens sheet 320, the diffusion plate 330, etc. sequentially. . In the present invention, in order to secure transparency, the prism sheet 310, the lens sheet 320, the diffusion plate 330, or the like may be formed as a beam that multiplies the object light 210.

The reference light 220 has an incident angle different from that of the object light 210 with respect to one surface of the first holographic optical element 121. Unlike the object light 210, the reference light 220 is incident on the first holographic optical element 121 without passing through the prism sheet 310, the lens sheet 320, the diffusion plate 330, or the like. In this case, the reference light 220 may be incident on the first holographic optical element 121 in the form of a parallel beam.

Then, the first hologram pattern 121b is formed on the first holographic optical element 121 due to the interference between the object light 210 and the reference light 220 (STEP C).

Therefore, the first holographic optical element 121 of the present invention includes a base film 121a and a first hologram pattern 121b formed on the base film 121a.

According to an embodiment of the present invention, when an object light is incident on the prepared

optical systems

210, 220, and 230 as parallel light, and a wavefront overlapped by multi-diffused light is obtained, an interference pattern between the wavefront and reference light that is parallel light is obtained. The first holographic pattern 121b may be formed on the first holographic optical element 121 by recording on the optical diffraction plate.

The prism sheet 310 represents a sheet on which a micro prism array 311 is formed.

The prism sheet 310 condenses the incident object light 210. This function of the prism sheet 310 can obtain the effect of improving the brightness. However, the above-described example is only an example for describing an embodiment of the present invention, and is not limited thereto. If the function of condensing the object light 210 may be performed, other condensing sheets or condensing sheets other than the prism sheet 310 may be performed. A lens (eg fresnel lens) can be used.

The lens sheet 320 represents a micro lens sheet having a micro lens array 321 formed on one surface thereof.

The lens sheet 320 may be composed of convex lenses having a short focal length to diameter to obtain a wide viewing angle. However, the above-described example is only an example for describing an embodiment of the present invention, and the present invention is not limited thereto. The lens sheet 320 may be formed of concave lenses in addition to convex lenses, provided that the focal length is shorter than the diameter. In addition, the lens sheet 320 may also be composed of a combination of convex and concave lenses satisfying the above conditions.

The diffusion plate 330 represents a part in which micro diffusion elements 331 are included therein.

The diffusion plate 330 diffuses the object light 210 which has passed through the prism sheet 310 and the lens sheet 320 sequentially to one surface of the first holographic optical element 121. However, the above-described example is only an example for describing an embodiment of the present invention and is not limited thereto. A diffusion sheet may be applied instead of the diffusion plate 330.

On the other hand, when generating the first holographic optical device 121 according to an embodiment of the present invention, the prism sheet 310, the lens sheet 320, and the diffusion plate 330 may not all be provided. In addition, when generating the first holographic optical device 121 according to another embodiment of the present invention may be provided with a prism sheet 310, a lens sheet 320, or a diffusion plate 330, these It may be provided with an optical system made by a combination of

However, as shown in FIGS. 2A and 2B, the prism sheet 310 may be generated in the form of light that emits the object light 210 incident on the first holographic optical element 121 according to the exemplary embodiment. ), Only the diffusion plate 330 among the lens sheet 320 and the diffusion plate 330 may be provided. In addition, two of the prism sheet 310, the lens sheet 320, and the diffusion plate 330 may be selectively generated to generate the object light 210 incident to the first holographic optical element 121 in the form of light that emits the object light 210. When provided, one of the prism sheet 310 and the lens sheet 320 may be provided together with the diffusion plate 330.

In the present specification, a holographic optical device including a second holographic optical element is referred to as a second holographic optical device.

First, the object light 210 and the reference light 220 are incident on the prism sheet 310, the lens sheet 320, the diffusion plate 330, etc. sequentially. In this case, the object light 210 and the reference light 220 have different incident angles with respect to the same surface of the prism sheet 310.

Subsequently, when the object light 210 and the reference light 220 pass through the prism sheet 310, the lens sheet 320, the diffusion plate 330, and so on, the object light 210 and the reference light 220 are second holographic. The second hologram pattern 122b is formed on the second holographic optical element 122 by the interference between the object light 210 and the reference light 220 by being incident on the optical element 122.

Accordingly, the second holographic optical element 122 of the present invention includes a base film 122a and a second hologram pattern 122b formed on the base film 122a.

In FIG. 3, the first hologram pattern 121b formed in the first holographic optical element 121 according to the first embodiment and the second holographic optical element 122 according to the second embodiment in FIG. 4 are formed. The hologram pattern 122b has a different shape. The reason why the first hologram pattern 121b and the second hologram pattern 122b are different from each other is that the object to which the reference light 220 is incident is the first holographic optical element 121 in FIG. 3, and the prism sheet in FIG. 4. Since the target to which the reference light 220 enters 310 is different, the first hologram pattern 121b and the second hologram pattern 122b have different shapes.

However, as shown in FIGS. 3 and 4, the

hologram patterns

121b and 122b have a constant period and a constant distribution ratio.

The first and second embodiments for generating the first and second holographic

optical elements

121 and 122 have been described above with reference to FIGS. 3 and 4. In the first embodiment of FIG. 3, the first holographic optical element 121 is incident on the first holographic optical element 121 in the form of light emitted by the object light 210 and the reference light 220 is parallel. This is an example in the case of entering into (see FIG. 2A). On the other hand, the second embodiment of FIG. 4 is an example in which the object light 210 and the reference light 220 are incident on the second holographic optical element 122 in the form of light emitted (see FIG. 2B).

This will be described with reference to FIG. 1 again.

The holographic optical device 120 according to an embodiment of the present invention includes a base film 120a and a hologram pattern 120b formed on the base film 120a, and the hologram pattern 120b is diffused. According to the distance between the plate and the holographic optical element 120 may have a variety of forms.

Specifically, the hologram pattern 120b is formed by adjusting the uniformity of the light efficiency according to the distance traveled through the diffuser plate spaced apart from the base film 120a to reach the holographic optical element 120. The shape of the hologram pattern 120b may be changed according to a state in which the reference light passes through or does not pass through the diffuser plate.

The distance between the diffuser plate 330 and the holographic optical element 120 may be changed according to characteristics of the holographic optical device 100 such as uniformity of light efficiency and viewing angle. That is, when the distance between the diffuser plate and the holographic optical element 120 is set narrow, the viewing angle can be enlarged while reducing the uniformity of light efficiency. When the distance between the diffuser plate and the holographic optical element 120 is set wider, The viewing angle can be reduced while increasing the uniformity of the light efficiency. The distance between the diffusion plate and the holographic optical element 120 described above is moved until the object light 210 is multiplied by the diffusion plate 330 and reaches the first holographic optical element 121 in FIG. 3. In FIG. 4, the combined light of the object light 210 and the reference light 220 is multiplied by the diffuser plate 330 and then moved to reach the second holographic optical element 122 in FIG. 4. The distance d2 is shown.

In addition, the intensity of the object light 210 and the reference light 220 incident on the holographic optical device 120 according to an exemplary embodiment may be matched to a preset range. When the intensities of the object light 210 and the reference light 220 are matched within a predetermined range, the hologram pattern 120b is formed on the base film 120a of the holographic optical element due to the interference between the object light 210 and the reference light 220. Can be formed. The intensity of the object light 210 and the reference light 220 is preferably the same, and the intensity of the object light 210 and the reference light 220 may be achieved by controlling the transmittance of the diffusion plate 330. Specifically, the transmittance of the diffusion plate 330 is possible by adjusting the spacing, size, arrangement, density of the bead particles included in the diffusion plate 330, material selection of the film, thickness control of the diffusion plate 330, refractive index, and the like. As a result, the intensity of the object light 210 and the reference light 220 incident on the holographic optical device 120 may be adjusted by controlling the transmittance of the diffusion plate 330.

Next, a holographic optical device having a VHOE film manufactured according to the reflective hologram recording method will be described.

In the present specification, the holographic optical device according to the third embodiment is referred to as a third holographic optical device 500.

Referring to FIG. 5, the third holographic optical device 500 may include a third holographic optical element 520 in which a hologram pattern is formed according to a reflective hologram recording method based on object light and reference light incident from different directions. It includes. In detail, the third holographic optical device 500 includes a mirror array 510 and a third holographic optical element 520. In the present invention, the third holographic optical device 500 may be applied as a beam projector screen.

The third holographic optical device 520 according to an embodiment of the present invention may include a base film 520a and a third hologram pattern 520b formed on the base film 520a. When the third hologram pattern 520b is exposed according to the interference pattern by the object light and the reference light, a monomer is combined with a functional group and polymerized to form a specific shape. The shape of the third hologram pattern 520b illustrated in FIG. 5 is just one example of the hologram pattern, and the shape of the hologram pattern in the present invention is not limited thereto.

Like the first and second holographic optical elements described above, the third holographic optical element 520 is suitable for a transparent screen such as a beam projector screen, and has a wide viewing angle and high brightness. In addition, the third holographic optical element 520 can effectively project an image even when the projection angle of the beam projector has a large inclination angle, and full color can be expressed.

The third holographic optical element 520 may be configured as a diffraction plate including volume diffraction elements diffracted in a previously designed direction, and may transmit and diffract light having different wavelength bands in the same direction. The third holographic optical device 520 may be formed in a single layer and stacked on the bottom surface of the mirror array 510. The above-described example is only an example for describing an embodiment of the present invention and the present invention is not limited thereto. The holographic optical element 520 may be formed as a single layer and stacked on the top surface of the mirror array 510.

The third holographic optical element 520 may be stacked on the bottom surface of the mirror array 510 using a lamination method. The third holographic optical device 500 may further include a coating layer (not shown). When the third holographic optical device 520 is stacked on the bottom of the mirror array 510, the coating layer may be stacked on the top surface of the glass device 510. In the present invention, the coating layer may be formed of an anti-reflection (AR) coating layer.

According to another embodiment of the present invention, the third holographic optical device 500 may include a transparent element stacked on the other surface of the mirror array 510 described above. The transparent element is in the form of a plate, and may be formed of a transparent material as a material, and may be stacked on an upper surface of the mirror array 510. For example, the transparent element may be formed in the form of a transparent glass plate made of a glass component as a material, but is not limited thereto. It is also possible to use a material such as an acrylic plate, which is another element formed transparently instead of the glass plate.

The third holographic optical element 520 may be generated by forming a pattern on a volume holographic optical element (VHOE) film using a reflective holographic recording method. A detailed description of the reflective hologram recording method will be given later with reference to FIG. 7.

The third holographic optical element 520 may be generated by using a multi-angled divergent light having a wide angle as object light and recording it on the VHOE film. In detail, the third holographic optical device 520 according to the exemplary embodiment of the present invention may be generated by dispersing and diffracting respective color lights such as R, G, and B on the VHOE film using white light as an ambient light source. have. In addition, the third holographic optical device 520 may be generated as a device that performs a transparent screen function by allowing the scattered and diffracted color lights to overlap and diverge.

The third holographic optical device 520 is configured to assign a red beam, a green beam, a blue beam, etc. in order to perform a transparent screen function even when light of any wavelength band is incident. Depending on the transmission can be generated in turn. Since the method of generating the third holographic optical device 520 using the red light, the green light, the blue light, and the like in sequence is the same as that of the first and second holographic optical devices, a detailed description thereof will be omitted.

In addition, since the third holographic optical element 520 is manufactured in the same size as that of the first and second holographic optical elements, a detailed description thereof will be omitted.

The object light 610 may be incident on one side of the third holographic optical element 520 in the form of light emitted as shown in FIGS. 6A and 6B. On the other hand, the reference light 620 is incident on the other side of the third holographic optical element 520 in the form of parallel light as shown in FIG. 6A, or as the third hole in the form of light emitting as shown in FIG. 6B. The light may be incident on the other side of the graphic optical device 520. In the present invention, in order to obtain a wider viewing angle, it is preferable to inject the third holographic optical element 520 in the form of light that emits not only the object light 610 but also the reference light 620.

The third holographic optical element 520 may be generated using a lens sheet, a prism sheet, a light diffusion plate, or the like to obtain an optimized wide viewing angle (FOV). This will be described below.

First, the prism sheet 310, the lens sheet 320, the diffusion plate 330, the third holographic optical element 520, and the mirror sheet 710 are sequentially disposed (STEP A).

Thereafter, the object light 610 in the form of parallel light is incident on the prism sheet 310 (STEP B). The object light 610 incident on the prism sheet 310 is converted from the parallel light form into the divergent light form (in the form of multiple diverging beams) through the lens sheet 320, the diffuser plate 330, etc. in order, and then to the third light. It is incident on the holographic optical element 520 (STEP C). In an embodiment of the present invention, transparency may be ensured by forming a beam that multiplies the object light 610 using the prism sheet 310, the lens sheet 320, the diffusion plate 330, and the like.

On the other hand, when generating the third holographic optical device 520 according to an embodiment of the present invention, the prism sheet 310, the lens sheet 320, and the diffusion plate 330 may not all be provided. In addition, when generating the third holographic optical device 520 according to an embodiment of the present disclosure, the prism sheet 310, the lens sheet 320, or the diffusion plate 330 may be provided, and a combination thereof may be provided. It may be provided with an optical system made by.

6A and 6B, however, the prism sheet 310 may be generated in the form of light that emits the object light 610 incident on the third holographic optical device 520, according to an exemplary embodiment. ), Only the diffusion plate 330 among the lens sheet 320 and the diffusion plate 330 may be provided. In addition, two of the prism sheet 310, the lens sheet 320, and the diffusion plate 330 may be selectively generated to generate the object light 610 incident to the third holographic optical element 520 in the form of light that emits the object light 610. When provided, one of the prism sheet 310 and the lens sheet 320 may be provided together with the diffusion plate 330.

When the reference light 620 is incident on the third holographic optical element 520, the reference light 620 is incident at an incident angle different from that of the object light 610. When the object light 610 incident on the third holographic optical element 520 passes through the third holographic optical element 520 and is output to the outside, the object light 610 is a mirror sheet 710. It may be reflected by the plurality of mirrors 711 arranged in the third holographic optical element 520 (STEP D). In the exemplary embodiment of the present invention, the reflected light may be used as the reference light 620.

The mirror sheet 710 serves to reflect light and may include a plurality of mirrors 711 arranged on one surface of the mirror sheet 710 in one embodiment of the present invention. A plurality of mirrors 711 arranged on one surface of the mirror sheet 710 is a device that serves to reflect the beam at a tilt angle designed by returning light transmitted through the film, it may be composed of a plurality of concave mirrors, The reference light 620 may be formed of a plurality of concave mirrors that are inclined (tilted) at a predetermined angle in one direction so that the reference light 620 may be uniformly incident on the front surface of the third holographic optical element 520. However, the above-described example is only an example for describing an embodiment of the present invention and is not limited thereto. If the mirror sheet 710 can perform a function of reflecting light, the mirror sheet 710 is arranged on one surface of the mirror sheet 710. The plurality of mirrors 711 may include, but are not limited to, a micro lens array including a plurality of concave lenses in addition to the plurality of concave mirrors.

The plurality of mirrors 711 arranged on one surface of the mirror sheet 710 may be configured of a plurality of concave mirrors as described above. At this time, the inclined direction is such that the light transmitted when the reference light 620 is incident vertically is reflected by being inclined from the upper direction to the lower direction and from the left direction to the right direction, and is a beam diverging at the viewing angle designed as described above. A plurality of mirrors 711 arranged on one surface of the 710 may be designed. However, the inclination direction may change depending on the recording system. Inclination angles may be respectively selected according to the recording angle so as to obliquely reflect within 30 to 70 degrees. The angle of divergence depends on the divergence angle of the beam project applied.

The size of the concave mirror should theoretically be 100 micrometers or less, but at present 1 mm to 10 mm is the actual size that can be produced as designed the reflective recording pattern.

The light reflected from the plurality of mirrors 711 arranged on one surface of the mirror sheet 710 becomes a reference light and has an inclination value in a range of 30 to 70 degrees.

When the light reflected by the plurality of mirrors 711 arranged on one surface of the mirror sheet 710 is incident on the third holographic optical element 520 as the reference light 620, the object light 610 and the reference light 620 are used. ), The third hologram pattern 520b may be formed on the third holographic optical element 520 (STEP E).

In the present invention, when the object light 610 is incident on the prepared

optical system

310, 320, 330 as parallel light and a wavefront overlapped by the multi-diffused light is obtained, the interference pattern between the wavefront and the reference light 620 is obtained. The predetermined hologram pattern 520b may be formed on the third holographic optical element 520 by recording on the optical diffraction plate. The third hologram pattern 520b thus formed has a constant period and a constant distribution ratio.

The method of manufacturing the third holographic optical device 520 has been described above with reference to FIG. 7. In the embodiment of FIG. 7, the third holographic optical element 520 is incident on one side of the third holographic optical element 520 in the form of light emitted by the object light 610 and is in the form of light emitted by the reference light 620. It shows the case where it is incident on the other side of).

The manufacturing method of the third holographic optical device 520 described with reference to FIG. 7 is a diffusion film technology that is recorded in full color when recording in a reflective type, and is transparent while compensating for color dispersion. It is a technology that realizes full color holographic diffusion film.

The method proposed in the present invention should record a hologram with two beams incident in opposite directions, and has a structure that causes interference by reflecting a transmitted beam to a mirror without using two beams as in the prior art. This structure is based on the Danish-type reflective hologram recording principle, but unlike the conventional Danishek, it uses a reflected beam as a reference beam. Therefore, the existing structure is pure hologram recording, and color dispersion cannot be avoided, but the present technology solves the problem.

The technique of the present invention can also be recorded in large format. When projecting, it is composed of the front projection type, so the transmissive type basically needs a lot of space behind, but the reflective type has the advantage that the space of the basic projection display is closely adhered to the wall.

The shape of the third hologram pattern 520b illustrated in FIG. 7 is just one example of the hologram pattern, and the shape of the hologram pattern is not limited thereto. The hologram pattern may have various shapes according to the distance between the diffuser plate and the holographic optical element, the shape of the reference light incident on the holographic optical element, and the like. In the form of the above-mentioned reference light may be various forms such as divergent light or parallel light.

The distance d3 between the diffuser plate 330 and the third holographic optical element 520 reaches the third holographic optical element 520 after the object light 610 is multiplied by the diffuser plate 330. The distance d3 moved to below is shown.

Specifically, the third hologram pattern 520b is a distance traveled by the object light 610 to reach the third holographic optical element 520 through the diffuser plate 330 which is spaced apart from the base film 520a. According to (d3), the shape can be changed by adjusting the uniformity of the light efficiency. The distance d3 between the diffuser plate 330 and the third holographic optical element 520 may be changed according to characteristics of the second holographic optical device 500 such as uniformity of light efficiency and viewing angle. If the distance d3 between the diffusion plate 330 and the third holographic optical element 520 is set to be narrow, the viewing angle can be increased while reducing the uniformity of the light efficiency. On the other hand, when the distance d3 between the diffuser plate 330 and the third holographic optical element 520 is set wide, the viewing angle may be reduced while increasing the uniformity of the light efficiency.

Referring to FIG. 8, the holographic display apparatus 800 according to an exemplary embodiment includes a background image projector 810, a display unit 820, and a holographic optical device 830. In addition, the holographic display apparatus 800 according to an exemplary embodiment may further include a controller.

The background image projector 810 may project the background image 811 to the holographic optical device 830. The background image projector 810 according to an exemplary embodiment may project a predetermined background image 811 to the holographic optical device 830b included in the holographic optical device 830 under the control of the controller. have. Specifically, as described above with reference to FIGS. 1 to 7, the background image projector 810 may project the background image 811 onto the holographic optical device 830b in which various hologram patterns are recorded, according to an exemplary embodiment. Can be.

Background image projector 810 according to an embodiment of the present invention may be implemented as a projector for projecting an image on a white flat surface, such as a screen. In addition, the above-described projector can amplify the image signal in the high-performance CRT and project the background image 811 to the holographic optical device 830 through the projection lens, and the three LCD panels (red, A green halide lamp, which projects the background image 811 onto the holographic optics 830, and a chip made of small mirrors. The image 811 may be projected onto the holographic optical device 830 using the present invention, but the present invention is not limited thereto, and various types of projectors may be used.

The display 820 may inject light into the holographic optical device 830 to float the object image 821 in the space. According to an embodiment of the present disclosure, the display unit 820 may inject light into the holographic optical device 830 under the control of the controller, and the mirror array 830a included in the holographic optical device 830 may be The object image 821 may be plotted in space by reflecting light incident from the display unit 820.

The display unit 820 according to an embodiment of the present invention may include an organic compound film to emit light by itself in response to a current. In detail, the display unit 820 receives holes injected from the anode and electrons from the cathode, and moves the injected holes and electrons to the organic layer, whereby energy generated when electrons and holes meet each other in the organic layer. May be emitted in the form of light, and the emitted light may be incident on the holographic optical device 830. Accordingly, the display unit 820 may inject the light emitted by the above-described method into the holographic optical device 830 to float the object image 821 in the space.

The display unit 820 according to another embodiment of the present invention includes a backlight for generating white light, and the white light generated in the backlight passes through a liquid crystal and a color filter whose molecular arrangement is manipulated by an external electric field, Light may be filtered by the polarizer to be incident on the holographic optics 830. Accordingly, the display unit 820 may inject the light emitted by the above-described method into the holographic optical device 830 to float the object image 821 in the space.

However, the display unit 820 described above is only an example for describing an embodiment of the present invention, and the present invention is not limited thereto. Various display units capable of generating light to be incident on the holographic optical device 830 may be used. .

The holographic optical device 830 may include a holographic optical element 830b and a mirror array 830a.

The holographic optical device 830 according to an embodiment of the present invention may be applied as a beam projector screen.

The holographic optical device 830b may be in the form of a film that floats the background image 811 projected by the background image projector 810. The holographic optical element 830b may be formed in a single layer and stacked on the bottom surface of the mirror array 830a. The above-described example is only an example for describing an embodiment of the present invention and the present invention is not limited thereto. The holographic optical element 830b may be formed as a single layer and stacked on the top surface of the mirror array 830a.

The holographic optical device 830b according to an embodiment of the present invention has various holographic patterns formed on a base film by using a transmissive or reflective hologram recording method as described above with reference to FIGS. 1 to 7. 830b. The holographic optical element 830b may be generated using a prism sheet, a lens sheet, and a diffusion plate to obtain an optimized wide viewing angle, and when using the diffusion plate, the object light may be formed of a multi-beam beam. The reference light having an incident angle different from that of the object light with respect to one surface of the holographic optical element 830b is incident on the holographic optical element 830b without being transmitted through the prism sheet, the lens sheet, and the diffusion plate to form a hologram pattern. Can be. In addition, the reference light may be incident on the holographic optical element 830b while passing through a prism sheet, a lens sheet, a diffusion plate, or a combination thereof to form another hologram pattern. In addition, the multi-diffusion beam formed by passing the object light through the diffuser plate is reflected by the mirror sheet having the plurality of mirrors arranged through the holographic optical element 830b, so that the reference light corresponding to the reflected multi-diffusion beam is holographic optical. Another hologram pattern may be formed by entering the device 830b.

The holographic optical device 830b included in the holographic optical device 830 according to an embodiment of the present invention is parallel if the light output from the background image projector 810 projecting the background image 811 is parallel light. It may include a hologram pattern formed by using the reference light, and if the light output from the background image projector 810 projecting the background image 811 is not parallel light, it may include a hologram pattern formed using the reference light emitted. have.

Accordingly, the reference light may have any one of parallel light and divergent light. However, when the background image projector 810 is implemented as a projector, most projectors emit divergent light. The reference light is preferably formed as a diverging beam to form the diffracted diffused light from the holographic optical element 830b that is transparent and has the highest light efficiency. In addition, the object light is preferably formed of multiple diverging beams in order to obtain a wide viewing angle for 2D. It is also desirable to use all of the optical systems (prism sheet, lens sheet and diffuser plate) to obtain a holographic diffraction plate that diverges without wide viewing angle and color dispersion.

The holographic optical device 830 according to another embodiment of the present invention may provide a full color of the background image 811 output by the background image projector 810 when the background image projector 810 is implemented as a projector. It may further include a transparent element to provide (full color).

The mirror array 830a may be located on one surface of the holographic optical element 830b, and reflects light incident from the display unit 820 to an object image having a predetermined angle with a background image 811 that is floated. 821). Specifically, the mirror array 830a according to an embodiment of the present invention uses a retro reflection effect to reflect incident light so that the direction in which light is incident and the direction in which the incident light is reflected are identical in space. The floated background image 811 and the object image 821 having a predetermined angle may also be floated in space.

In the mirror array 830a according to an exemplary embodiment, a plurality of micro mirrors may be arranged. Each of the plurality of micromirrors may have a shape such as a rectangle, a triangle, a circle, and the like, but is not limited thereto.

Therefore, the object image 821 and the background image 811 formed by the above-described method can be simultaneously generated in space, thereby providing a stereoscopic image to viewers.

Referring to FIG. 9, the holographic display apparatus 900 includes a background image projector 810, a display 820, a holographic optical device 830, and a support 910.

As described with reference to FIG. 8, the background image projector 810 may project the background image 811 to the holographic optical device 830. Specifically, as described above with reference to FIGS. 1 to 7, in the holographic optical device 830b, the light output from the background image projector 810 projecting the background image 811 is parallel light. It includes a hologram pattern formed using a reference light that goes in parallel to the back, and includes a hologram pattern formed using a reference light that is emitted when the light output from the background image projector 810 projecting the background image 811 is not parallel light. can do.

The holographic optical device 830 may include a holographic optical element 830a and a mirror array 830a.

The display 820 may inject light into the holographic optical device 830 at a predetermined angle θ2 to float the object image 821 in the space. The display unit 820 according to an exemplary embodiment may inject light into the holographic optical device 830 at a predetermined angle θ2 under the control of the controller, and include the light in the holographic optical device 830. The mirror array 830a reflects the light incident from the display unit 820 by using a retroreflective effect of reflecting the incident light such that the direction in which light is incident and the direction in which the incident light is reflected are the same. The image 821 may be plotted.

The mirror array 830a may be located on one surface of the holographic optical element 830b, and reflects the light incident from the display unit 820 to the background image 811 generated in the space by the above-described method. The object image 821 having a predetermined angle θ may be arranged in a predetermined direction to generate in the space.

In addition, in the support unit 910 according to an embodiment of the present invention, the display unit 820 injects light into the holographic optical device 830 at a predetermined angle θ2 so that the object image 821 is predetermined in space. The display unit 820 may be configured to be positioned inside the support unit 910 so as to float in the direction of, and the holographic optical device 830 may be configured to be positioned at a predetermined angle θ1 with the ground. have. In detail, when viewers look at the object image 821 floated on the space, the object image 821 may be generated in a direction perpendicular to the direction in which the viewer views the object image 821. Accordingly, viewers may view the object image 821 and the background image 811 floated in the space without the television, rather than watching the image from the existing television. Θ1 and θ2 may be formed at an angle of 45 degrees, respectively, so that the object image 821 is generated in the above-described direction, but the above-described angles are merely examples for describing an exemplary embodiment of the present invention.

In addition, as described above, the mirror array 830a according to an embodiment of the present invention generates a floated background image 811 and an object image 821 having a predetermined angle θ, respectively. In the case of FIG. 1, the object image 821 may be generated in a vertical direction with respect to the direction in which the object image 821 is viewed, and the background image 811 may be formed at an angle of 45 degrees with the above-described object image 821. It may be disposed on the back of the 821, the viewer can simultaneously view the background image 811 with the object image 821.

By the above-described method, the background image projector 810 and the display 820 may be included in the support 910 such that the holographic display apparatus 900 simultaneously generates the background image 811 and the object image 821. have.

Accordingly, the holographic display apparatus 900 according to an exemplary embodiment may simultaneously generate a background image 811 and an object image 821 in a space, and the object image 821 may be viewed by viewers. Because it can be generated in the vertical direction with respect to the viewer, viewers can see a more vivid image than before.

Although all the components constituting the embodiments of the present invention described above are described as being combined or operating in combination, the present invention is not necessarily limited to these embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or some of the components of the components are selectively combined to perform some or all of the functions combined in one or a plurality of hardware It may be implemented as a computer program having a. In addition, such a computer program is stored in a computer readable medium such as a USB memory, a CD disk, a flash memory, and the like, and is read and executed by a computer, thereby implementing an embodiment of the present invention. The recording medium of the computer program may include a magnetic recording medium, an optical recording medium and the like.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention, but to describe them. . The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims

Holographic Optical Elements in the form of a film for plotting a background image; And

And a mirror array positioned on one surface of the holographic optical element to generate an object image having a predetermined angle with the floated background image.
The method of claim 1,

The holographic optical element

Base film; And

And a hologram pattern formed on the base film and formed based on interference between the multi-diffusing object light and the reference light.
The method of claim 2,

The object light is multi-transmitted through the prism sheet for condensing the object light, the lens sheet, the diffusion plate for diffusing the object light to the entire surface of the holographic optical element or a combination thereof Device.
The method of claim 3,

The hologram pattern is,

Holographic optical device characterized in that the shape is converted by adjusting the uniformity of the light efficiency according to the distance traveled through the diffuser plate spaced apart from the base film to reach the holographic optical element .
The method of claim 4, wherein

And the hologram pattern is a first hologram pattern in which the reference light is incident on the holographic optical element without passing through all of the prism sheet, the lens sheet, and the diffusion plate.
The method of claim 4, wherein

The hologram pattern may be a second hologram pattern in which the reference light passes through the prism sheet, the lens sheet, the diffusion plate, or a combination thereof, and the transmitted reference light is incident to the holographic optical element. Graphics optics.
The method of claim 3,

The hologram pattern is,

The object light is incident on one side of the holographic optical element,

The reference light is light reflected by a reflector having a pre-designed structure through which the object light passes through the holographic optical element,

And a third hologram pattern in which the reference light is incident on the other side of the holographic optical element.
The method of claim 1,

And a transparent element formed of a transparent material and positioned on the other side of the mirror array.
Holographic optics;

A background image projector for projecting a background image onto the holographic optical device; And

And a display unit for injecting light into the holographic optical device to generate an object image in space.

The holographic optical device,

Holographic optical elements in the form of a film for plotting the projected background image; And

And a mirror array positioned on one surface of the holographic optical element to reflect the light incident from the display to generate the object image having a predetermined angle with the floated background image.
The method of claim 9,

The display unit holographic display device comprising an organic compound film to emit light by itself in response to the current.
The method of claim 9,

The display unit includes a backlight for generating light, and the light generated from the backlight passes through a liquid crystal whose molecular arrangement is manipulated by an external electric field, and the propagation direction of the transmitted light is polarized in a preset direction so that the holographic optical device Holographic display device characterized in that the incident.
The method of claim 9,

And a support unit for arranging the holographic optical device at a predetermined angle with the display unit such that the object image is generated in a predetermined direction in space.