KR20190048723A - Screen and hologram apparatus including same - Google Patents

Abstract

According to one embodiment, a hologram device comprises: a screen on which an image is projected; and an image outputting part which projects the image on the screen. The image outputting part includes a UV light source which irradiates UV light, and the screen includes an optical deformation layer where a transparency of a part to which the UV light is irradiated is lower than that of a part to which the UV light is not irradiated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a screen for video output and a hologram apparatus including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen for video output and a hologram apparatus including the same.

A hologram is a three-dimensional (3D) image that is created using the principle of holography. The principle of holography is to divide the light rays from the laser into two, one light to direct the screen, and the other light to interfere with the light we are looking at, so that interference fringes are created. A film in which such interference fringes are stored is called a hologram.

On the other hand, a pseudo hologram refers to a hologram similar to a three-dimensional picture generated by the above-described holography, and uses a semi-transmissive screen and a multi-view stereoscopic image to produce a hologram- Output technique. A similar hologram uses a floating method using a transparent film or a method of synthesizing a real object with a digital image.

Since the device for outputting the pseudo hologram is not a perfect 3D image, it can not observe the corresponding image in all directions. However, the device is relatively easy and simple to implement compared with the 3D hologram device. Accordingly, research on similar hologram devices has been actively conducted, and there is a growing demand for a device capable of achieving a high hologram effect by enhancing visibility while simultaneously giving a stereoscopic effect to an image.

Korean Unexamined Patent Publication No. 10-2016-0128035 (Announcement of Nov. 2016)

In order to improve the stereoscopic effect of the image provided by the conventional similar hologram apparatus, the transparency of the screen on which the image is projected must be increased, while the transparency of the screen must be lowered in order to improve the visibility of the image. In other words, in order to enhance the hologram effect, the transmissivity of the portion where the image is projected on the screen should be low, and the transmissivity of the background portion where the image is not projected should be high.

Accordingly, it is an object of the present invention to provide a video output screen capable of increasing the hologram effect by partially changing the transparency only in a region where an image is projected, and a hologram device including the same.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. will be.

According to an embodiment of the present invention, there is provided an image display apparatus including: a screen on which an image is projected; And an image output unit for projecting an image on the screen, wherein the image output unit includes a UV light source for irradiating UV light, and the screen is optically transparent with respect to a part where the UV light is irradiated, A hologram apparatus including a strained layer can be provided.

A base layer made of a transparent material; A scattering layer deposited on the base layer; And an optical distortion layer which is laminated on the scattering layer and whose transparency at a site irradiated with UV light is lower than that at which UV light is not irradiated.

According to an embodiment of the present invention, there is provided a video output screen capable of enhancing a hologram effect by changing the transparency of a portion where an image is projected and a portion where an image is not projected on a video output screen, and a hologram device including the same Can be effective.

In addition, the problem of lowering the visibility of the image due to the external light source is minimized even in an indoor environment or an outdoor environment with bright illumination, and the visibility of the image can be maintained at an appropriate level even in the presence of an external light source.

FIG. 1 is a conceptual view briefly showing a configuration of a hologram device according to an embodiment of the present invention.
2 is a view showing a structure of a screen for video output used in the hologram apparatus of FIG.
FIG. 3 is a view showing a modification of the structure of a screen for video output used in the hologram apparatus of FIG. 2. FIG.
FIG. 4 is a diagram conceptually showing the video output unit of FIG. 1. FIG.
5 is a view for explaining the principle that the visibility of an image formed by the hologram apparatus of FIG. 1 can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, a hologram apparatus according to an embodiment of the present invention will be described with reference to FIG.

Referring to FIG. 1, a hologram apparatus 10 according to an embodiment of the present invention may include a screen 100 and an image output unit 200.

The screen 100 is positioned in front of the image output unit 200 and the image projected from the image output unit 200 is projected onto the screen 100. [ At this time, the observer P may be positioned on the opposite side of the image output unit 200, that is, on the front side with respect to the screen 100, and the image projected by the image output unit 200 may be displayed on the screen 100 And can be observed by the observer (P). The observer Q can also be positioned on the opposite side of the image output unit 200, that is, on the rear side with respect to the screen 100, and can observe the image reflected from the screen 100. [

The image output unit 200 includes an internal light source, and can generate an image using an internal light source and project the image to the screen 100 side. At this time, the image output unit 200 includes a UV light source in addition to the RGB light source 214 as a light source, and projects an image synthesized from monochromatic light and UV light onto the screen 100. [

Hereinafter, a specific structure of the screen 100 used in the hologram apparatus 10 of FIG. 1 will be described with reference to FIG.

Referring to FIG. 2, the image output screen 100 according to an exemplary embodiment of the present invention may have a multi-layered structure including a plurality of layers of films. Specifically, the base layer 110, the scattering layer 120, A strained layer 130 may be included. The light beams constituting the image projected from the image output unit 200 are transmitted to the front side while sequentially passing through the base layer 110, the scattering layer 120 and the optical strain layer 130, It can be recognized as a holographic image to the observer P. Part of the light beams projected onto the screen 100 are reflected backward by the scattering layer 120 and the optical strain layer 130 so that the hologram image can be observed even in the case of the observer Q on the rear side .

The base layer 110 may be a transparent panel and may maintain the shape of the screen 100 while supporting the other layers constituting the screen 100. The base layer 110 may be made of a material such as glass, silicon, or acrylic.

The scattering layer 120 is stacked on the base layer 110. The scattering layer 120 causes a diffuse reflection phenomenon which is scattered at various angles without being subjected to regular reflection when a light beam is incident on a coating film on which microscopic surface irregularities are formed by particles It prevents glare on the display screen and improves the visibility of the image. At this time, the scattering layer 120 is provided to reflect only a part of the incident light beams and transmit the remaining light beams without reflecting the incident light beams 100%. Accordingly, the scattering layer 120 can have a predetermined transparency, and images of both the front and rear observers P and Q can be observed.

The scattering layer 120 can be manufactured by, for example, coating a base film with a dispersion containing particles having a size of several tens nm to several mu m to cure the base film. The dispersion may be prepared by injecting particles having a diameter of about 1.0 to 8.0 탆 into a binder resin using an ultraviolet curable resin. Examples of the resin include acrylate monomers, oligomers, The particles may be organic particles of various materials such as PMMA (poly (methyl methacrylate)), PS (polystyrene), PE (polyethylene), PP (polypropylene) , Inorganic particles such as silica can be used. However, this is merely an example, and the scattering layer 120 may be manufactured by a method of corroding the glass.

The optically strained layer 130 may be laminated on the scattering layer 120 and may be provided such that the transparency of the portion irradiated with the UV light is lowered. The optically deformable layer 130 may include a photochromic film and the photochromic film may be prepared by depositing an optical dye on the base where color conversion occurs when exposed to UV light. The photochromic film applied to the optically strained layer 130 has a characteristic that the color of the portion to which the UV light is irradiated changes and returns to the original color when the irradiated UV light is removed. It can also be used as a function to control transparency.

Accordingly, the transparency of the portion where the UV light is irradiated becomes lower than the portion where the UV light is not irradiated, the portion where the UV light is not irradiated can maintain the original transparency, and the UV light When removed, the portion of the transparency that was lowered can be returned to the original transparency again. Thus, due to the influence of the UV light included in the image projected from the image output unit 200, the transparency of the portion of the screen 100 where the image is projected is lowered, so that the visibility of the image is increased and the transparency of the remaining portion of the screen 100 Can be maintained and the stereoscopic effect of the projected image can be utilized, so that a high hologram effect can be obtained.

On the other hand, when the above-described hologram device is used in a relatively dark room, there is no great problem in visibility of the image projected from the image output unit 200, The transparency of a portion other than a desired portion of the optical deformation layer 130 may also be changed due to the influence of UV light irradiated through external light such as sunlight in addition to the UV light. This results in deterioration of the visibility of the image, and means for supplementing it are required.

To compensate for this, a modification of the screen as described below can be proposed. Hereinafter, such a modification will be described with reference to Fig. In explaining the modification shown in Fig. 3, there is a difference from the embodiment shown in Fig. 2 in that a UV blocking layer is further laminated on the optically strained layer of the screen. The description of FIG. 2 is used.

The image output screen 100 'according to the modification shown in FIG. 3 further includes a UV blocking layer 140. The UV blocking layer 140 is laminated on the optically deformable layer 130 and is provided to block the UV light from the external light source in addition to the UV light emitted from the image output section 200. At this time, the UV blocking layer 140 may be provided as a film of a transparent material coated with a coating for blocking UV light, and the remaining light except for the UV light may be transmitted without filtration. Accordingly, the transparency of the optical deflecting layer 130 is prevented from being changed by the external light source, so that the hologram effect can be maintained even in an environment where an external light source exists.

4, the image output unit 200 includes an illumination optical system 210, a projection optical system 220 that receives the light beams projected from the illumination optical system 210 and generates an image to be projected and projects the image onto the screen 100 And a control unit 230. [0033] The image output unit 200 may be, for example, a liquid crystal on silicon (LCOS) projector, but is not limited thereto.

The illumination optical system 210 includes a UV light source 212, an RGB light source 214, a mirror 216 for reflecting the light beam, and a beam shaping unit 218 for expanding or refracting the light beam. .

The UV light source 212 generates and illuminates UV light. The UV light source 212 may be implemented using an illumination device, such as a UV LED (light emitting diode) or a laser light source, which generates power by receiving power.

The RGB light source 214 generates and irradiates monochromatic light having red, green, and blue colors, respectively. The RGB light source 214 may be implemented using an illumination device such as an LED or a laser light source that receives power and generates light.

A plurality of light beams emitted from the UV light source 212 and the RGB light source 214 converge to form a light beam. The light beams emitted from the respective light sources 212 and 214 pass through the amplifying lens 211 and the transflector 213 disposed on the front surfaces of the light sources 212 and 214 to form a single path. The light beam thus formed is reflected by the mirror 216, passes through the beam forming unit 218, and is irradiated to the projection optical system 220.

The projection optical system 220 may include an image generation panel 222, a polarization beam splitter 224, and a projection lens 226. The light beam irradiated from the illumination optical system 210 is reflected by the polarization beam splitter 224 and transmitted to the image generation panel 222.

The image generation panel 222 includes pixels for generating an image to be projected and can be controlled by the control unit 230. [ In detail, the image generation panel 222 is controlled according to the information about the image stored or input to the controller 230, so that the projection image can be generated using the light beam, and the generated projection image is transmitted to the polarization beam splitter 224 To be transmitted. The projection image transmitted through the polarized beam splitter 224 passes through the projection lens 226 and is projected onto the screen 100. Since the UV light is also included in the light beam transmitted to the image generation panel 222, the projection image generated by the image generation panel 222 and passing through the projection lens 226 also includes UV light.

The control unit 230 may control the light irradiation function of the UV light source 212 and the RGB light source 214 and the amount of light to be irradiated, in addition to the image generation panel 222. To this end, the controller 230 may be embodied by a memory for storing programmed instructions and a microprocessor for executing such instructions.

Hereinafter, the operation and effect of the hologram device 10 according to the present embodiment having the above-described configuration will be described with reference to Figs. 5 and 6. Fig.

The UV light emitted from the UV light source 212 of the illumination optical system 210 and the monochromatic light emitted from the RGB light source 214 pass through the amplification lens 211 and the transflective plate 213 one by one, And then transmitted to the mirror 216. [ The light beam reflected by the mirror 216 passes through the beam shaping unit 218, is shaped into a beam shape suitable for image generation, and is incident on the projection optical system 220.

The light beams incident on the projection optical system 220 are reflected by the polarized beam splitter 224 and transmitted to the rear image generation panel 222. The image generation panel 222 receives the image data stored in the controller 230, And generates a predetermined projection image based on the information. The projection image thus generated passes through the polarizing beam splitter 224 and is projected onto the screen 100 through the projection lens 226.

The image projected onto the screen 100 passes through the base layer 110 of the screen 100, the scattering layer 120 and the optical strained layer 130 in order and finally observed as an image by the observer P on the front side . At this time, a part of the projected image passes through the scattering layer 120 and the optical strained layer 130 of the screen 100 and is transmitted to the front side, while the rest is transmitted to the scattering layer 120 and the optical strained layer 130 And can be transmitted to the rear side. Thus, not only the front-side observer P but also the rear-side observer Q can observe the image.

Since the UV light is also irradiated to the area where the image is projected, the image is divided into the image projection area Y where the image is projected and the remaining background area X as shown in FIG. 5 (A) Respectively. In other words, in the image projection area Y, the transparency is lowered due to the influence of the UV light irradiated on the optical strained layer 130, and the image is projected to the image projection area Y in which the transparency is lower than the background area X Projected. Accordingly, a clear hologram image Z corresponding to the image projection area Y can be provided as shown in FIG. 5B, and the remaining background area X is still in a transparent state, An effect that the visual sense of the image Z can be improved and the stereoscopic effect can be utilized at the same time is achieved. This hologram effect can be similarly transmitted not only to the front side observer P but also to the rear side observer Q. [

The above description is merely illustrative of the technical idea of the present invention, and various modifications and changes may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Hologram apparatus 100: Video output screen
110: base layer 120: scattering layer
130: optical strain layer 140: UV blocking layer
200: image output unit 210: illumination optical system
220: Projection optical system 230:

Claims (6)

A screen on which an image is projected; And
And an image output unit for projecting the image on the screen,
Wherein the image output unit includes a UV light source for irradiating UV light,
Wherein the screen comprises an optically strained layer in which the transparency of the portion to which the UV light is irradiated is lower than that of the portion to which the UV light is not irradiated
Hologram device. The method according to claim 1,
The screen,
Further comprising a UV blocking layer deposited on said optically strained layer
Hologram device. 3. The method according to claim 1 or 2,
The optically-
And a photochromic film comprising an optical dye that undergoes color conversion upon exposure to UV light.
Hologram device. The method according to claim 1,
Wherein the image output unit comprises:
An illumination optical system including the UV light source and the RGB light source; And
And a projection optical system for receiving the light beam including the UV light emitted from the illumination optical system and generating the image and projecting the image to the screen
Hologram device. A base layer made of a transparent material;
A scattering layer deposited on the base layer; And
And an optically deformable layer laminated on the scattering layer, wherein the transparency of the portion irradiated with the UV light is lower than that of the portion not irradiated with the UV light
Screen for video output. 6. The method of claim 5,
Further comprising a UV blocking layer deposited on said optically strained layer
Screen for video output.

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