KR20110018756A - Three dimensional image display device comprising lenticular sheet and method of fabrication of the same - Google Patents

Abstract

PURPOSE: A 3D image displaying device including a lenticular sheet and a method for manufacturing the same are provided to have a thinner lenticular sheet. CONSTITUTION: A device for displaying a 3D image including a lenticular sheet comprises the following units. A lens layer(110) includes convex lenses(112) which are arranged in square or hexagonal shape. An image pattern layer(142) includes fine patterns corresponding to the convex lenses. A transparent substrate(130) is combined between the lens layer and the image pattern.

Description

Three dimensional image display device comprising lenticular sheet and method of fabrication of the same

The present invention relates to a three-dimensional image display device using a lenticular, and more particularly, to a method of forming an image pattern layer of a three-dimensional image display device.

In the case of an image formed on a two-dimensional plane, since the incidence angles of the images incident on both eyes of the person are almost the same, the person recognizes that the images are located at substantially the same distance. Therefore, even if the image formed on the two-dimensional plane is a three-dimensional image, a person recognizes the image two-dimensionally. However, by using an optical lens sheet such as a lenticular sheet, it is possible for a person to recognize an image formed on a two-dimensional plane as a three-dimensional, that is, a three-dimensional image.

The principle of recognizing a two-dimensional image as a stereoscopic image using a lenticular sheet uses binocular disparity that appears because the human eye is about 64 mm apart. Here, binocular parallax is a phenomenon in which the left and right eyes of a person are spaced at predetermined intervals so that even if the image of the same position is different from the light paths coming into the left and right eyes, a slightly different image is formed on the left and right retinas. Say

The lenticular sheet has a transparent hemispherical lens formed on the upper surface and the lower surface is flat. Currently, various products have been developed that employ the principle of recognizing two-dimensional images in three dimensions by using the lenticular sheet. However, due to the size of the lenses used in the lenticular sheet, the thickness cannot be reduced, making it difficult to apply to various products. there is a problem. This is because the size of the lenses as well as the size of the image pattern formed on the lenticular sheet must be reduced.

As described above, since lenticular sheets enable viewing of three-dimensional stereoscopic images without any tools, there is an increasing demand for products that want various designs, such as portable communication devices. However, with the tendency of light and short reduction of portable products such as portable communication devices, the application of the lenticular sheet to such a product has become a big constraint condition of the thickness of the lenticular sheet. Despite various needs, lenticular sheets are inevitably limited.

Accordingly, an object of the present invention is to provide a three-dimensional image display apparatus including a thinner lenticular sheet by finely forming an image pattern layer of the three-dimensional image display apparatus.

Another object of the present invention is to provide a method of manufacturing the 3D image display device.

In order to solve the above problems, a three-dimensional image display device according to an aspect of the present invention, the lens layer including a plurality of convex lenses arranged in a square or hexagon array; An image pattern layer including a plurality of fine patterns arranged to correspond to the plurality of convex lenses, respectively; And a transparent substrate coupled between the lens layer and the image pattern. The image pattern layer is formed by fine patterning a metal layer using a photolithography process.

In example embodiments, the line width of the image pattern layer may be 1 μm to 30 μm. In addition, the transparent substrate may have a thickness such that the focal points of the plurality of convex lenses are positioned on the plurality of fine patterns, respectively. In addition, the pitch of the plurality of convex lenses may be the same as the pitch of the plurality of fine patterns. The display device may further include a colored background layer formed on the opposite side of the lens layer with respect to the image pattern layer so that the two-color image is displayed through the lens layer. In addition, it may further include a UV film layer bonded between the lens layer and the transparent substrate.

According to other examples of the 3D image display device, the metal layer may be silver, gold, aluminum, silicon, titanium, chromium, iron, cobalt, nickel, copper, zinc, germanium, zirconium, niobium, molybdenum, palladium, tin, anti It may be made of mony, tantalum, tungsten, platinum, bismuth, stainless steel or alloys thereof. Furthermore, the metal layer may be formed of a plurality of metal thin films stacked on each other.

According to still other examples of the 3D image display device, the 3D image display device is used for any one of a business card, a credit card, a decorative material, a keypad, a packing material, a switch, a sidewalk block, a coaster and a billboard, or a portable electronic device. Can be.

In order to solve the other problems, a method of manufacturing a three-dimensional image display device according to another aspect of the present invention, comprising the steps of preparing a lenticular sheet formed with a plurality of convex lenses arranged in a square or hexagon array on the first surface; Depositing a material layer on a second side of the lenticular sheet opposite the first side; And fine patterning the material layer using a photolithography process to form a material layer pattern including a plurality of fine patterns arranged to correspond to the plurality of convex lenses, respectively.

According to one example of a method of manufacturing the 3D image display device, fine patterning the material layer using a photolithography process may include forming a photoresist layer on the material layer; Patterning the photoresist layer to form a photoresist pattern; And etching the material layer to expose a portion of the second surface by using the photoresist pattern as an etching mask. The method may further include applying a colored material layer on a portion of the second surface and the material layer pattern exposed through the material layer pattern.

The three-dimensional image display device and the method of manufacturing the same according to one embodiment of the present invention, by using a photolithography process, one of the semiconductor process of the image pattern layer of the three-dimensional image display device, fine patterns are repeated at a constant pitch The images to be arranged can be formed precisely. Therefore, it is possible to form an image with high quality at a lower price than forming an image pattern by a printing method.

In addition, although the lens of the lenticular sheet could not be made small due to the limitation of the pitch and line width of the fine patterns, the fine patterns with the fine line width were enabled, so that the pitch of the fine patterns could also be significantly reduced. Therefore, the size and / or pitch of the lens of the lenticular sheet can also be reduced, thereby reducing the thickness of the entire 3D image display device. Accordingly, the present invention may be applied to a product whose thickness is very important, such as a portable electronic device, a business card, a credit card, and the like, thereby maximizing people's visual interest.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, when an element is described as being present on top of another element, it may be directly on top of the other element, and a third element may be interposed therebetween. Also, although a component may be described as being on top of another component, it may be located underneath other components, depending on the usage or operating aspect. In the drawings, the thickness and size of each constituent element are exaggerated for convenience and clarity of description, and a portion not related to the description is omitted. Like numbers refer to like elements in the figures. It is to be understood that the terminology used is for the purpose of describing the present invention only and is not used to limit the scope of the present invention.

1 is a conceptual diagram illustrating a principle of displaying a stereoscopic image through a 3D image display apparatus including a lenticular.

As described above, binocular parallax occurs because a person's left eye and right eye are separated by a predetermined distance. By properly interpreting the minute differences caused by binocular parallax, the human body can feel three-dimensional. The lenticular sheet may be used as a method for maximizing stereoscopic recognition effect by using such binocular disparity.

Referring to FIG. 1, a stereoscopic image forming principle using a lenticular sheet in which a plurality of lenses 14 are arranged is basically the same as a method using red blue glasses or polarized glasses. The left eye of the person can see only the left eye image (L), and the right eye of the person blocks the right eye image (R) incident to the left eye, so that only the right eye image (R) can be seen. It is to block the incident left eye image (L). As shown in FIG. 1, since the left eye and the right eye are spaced apart from each other by a predetermined distance, there is a difference in the angle of the gaze from both eyes toward the lens 12. Accordingly, the left eye is refracted while passing through the lenses 12 along the line of sight indicated by a dashed line, so that only the left eye image L of the image pattern 14 can be viewed. In addition, the right eye is refracted while passing through the lenses 12 along the line of sight indicated by a dotted line, so that only the right eye image R of the image pattern 14 can be seen. Therefore, the human brain may recognize a stereoscopic image in which these images L and R are combined by combining the left eye image L incident to the left eye and the right eye image R incident to the right eye.

As such, in order to form a stereoscopic image, lenses 12 having the same size are arranged in a row, and a regular image pattern 14 is formed periodically behind the lenses 12. In the image pattern 14, the left eye image L and the right eye image R are alternately arranged, and the sum of the sizes of the left eye image L and the right eye image R is the size of the lenses 12. Is arranged as Also, the distance between the lenses 12 and the image pattern 14 may vary depending on the distance between the lenses 12 and both eyes of the person. In addition, although FIG. 1 illustrates that a person is positioned perpendicular to the image pattern 14, three or more images are alternately divided so that an image viewed by a person varies according to the position of the person with respect to the image pattern 14. It can be arranged in the image pattern 14. In this case, the stereoscopic image recognized when the person moves to the left side and the stereoscopic image recognized when the person moves to the right side may be different. To this end, the separation distance between the image pattern 14 and the lenses 12 may vary.

Here, although the 3D image display device 10 using the lenticular is shown very simply, it actually has a more complicated structure. This is described in more detail below. It should also be noted that Figure 1 is exaggerated for clarity.

2A to 2C illustrate a 3D image display device including a lenticular sheet according to an embodiment of the present invention. 2A is a cross-sectional view taken along the line A-A of FIGS. 2B and 2C. FIG. 2B is a plan view from above to illustrate the lens layer 110 of FIG. 2A, and FIG. 2D is a plan view from above to illustrate the lens layer 110 of FIG. 2A, according to another embodiment. . FIG. 2C is a plan view from above with the lens layer 110 removed to illustrate the image layer 140 of FIG. 2A.

2A to 2C, the 3D image display apparatus 100 according to the present exemplary embodiment includes a lens layer 110, a transparent substrate 130, and an image pattern layer 142.

The lens layer 110 includes a plurality of convex lenses 112 arranged in a specific pattern. The plurality of convex lenses 112 may be hemispherical lenses. In order to reduce the thickness of the 3D image display device 100, the lens layer 110 may be formed of a material having a large difference in refractive index from the outside. As shown in FIG. 2B, the plurality of convex lenses 112 may be squarely arranged in a matrix form in rows and columns at right angles. Further, according to another embodiment, as shown in FIG. 2D, the plurality of convex lenses 112 ′ may be hexagonally arranged in such a manner that each of the three convex lenses 112 ′ forms an equilateral triangle. Hereinafter, in order to clearly understand the invention, an embodiment in which the plurality of convex lenses 112 are squarely arranged will be described. However, those skilled in the art will understand that the inventive concept is equally applicable to a plurality of hexagonally arranged convex lenses 112 ′. Referring to FIG. 2A, although the plurality of convex lenses 112 of the lens layer 110 are shown to be disposed toward the lower transparent substrate 130, the plurality of convex lenses 112 of the lens layer 110 are illustrated. ) May be arranged to face upward. As shown in FIG. 2B, a plurality of convex lenses 112 having a diameter d ₁ may be arranged at a pitch of d ₁ . The convex lenses 112 may have a size of 200 μm or less, for example, a diameter of 100 μm.

The transparent substrate 130 couples them to each other between the lens layer 110 and the image pattern layer 142. The transparent substrate 130 may be formed of plastic such as polyethylene terephthalate (PET). The transparent substrate 130 propagates the light incident from the lens layer 110 to the pattern layer 142 and transmits the light reflected from the pattern layer 142 to the lens layer 110. The distance between the plurality of convex lenses 112 and the image pattern layer 142 of the lens layer 110 may be determined through the thickness of the transparent substrate 130, and the thickness of the transparent substrate 130 may be adjusted as necessary. have. For example, the thickness of the transparent substrate 130 may be determined such that the focus of the plurality of convex lenses 112 is located on the image pattern layer 142. Referring to FIG. 2A, the transparent substrate 130 is illustrated as being formed of one substrate, but an upper substrate (not shown) on which the lens layer 110 is formed and a lower substrate (not shown) on which the image pattern layer 142 is formed. It may be a multilayer substrate bonded through this adhesive layer (not shown).

Optionally, the 3D image display apparatus 100 may further include a UV film layer 120. The UV film layer 120 is an adhesive layer for bonding the lens layer 110 to the transparent substrate 130. The UV film layer 120 is an ultraviolet curable resin that is cured through UV irradiation after the lens layer 110 is adhered to the transparent substrate 130. Can be formed. The UV film layer 120 preferably has an appropriate refractive index difference with the lens layer 110 to adjust the angle of refraction of light incident from the lens layer 110. The UV film layer 120 may be formed of, for example, acrylic resin, polycarbonate resin, MS resin (methyl methacrylate, styrene copolymer resin) polystyrene, PET, or the like.

The image pattern layer 142 is formed on the transparent substrate 130. The image pattern layer 142 may include a plurality of fine patterns (146 of FIG. 2C). The plurality of fine patterns 146 may be arranged in a square or hexagonal arrangement corresponding to the plurality of convex lenses 112, so that the plurality of fine patterns 146 have a square or regular hexagonal shape and are arranged repeatedly. Can be. In FIG. 2C, the plurality of fine patterns 146 are squarely arranged like the plurality of convex lenses 112 of FIG. 2B, and the plurality of fine patterns 146 are square. A plurality of fine patterns of 146 may be arranged at a pitch of d _2, d ₂ may be the same as the pitch d1 of the convex lens 112. The The image pattern layer 142 may be made of various materials, and for example, may be formed of a metal. In addition, the image pattern layer 142 may be formed by fine patterning a metal layer using a photolithography process, which is one of semiconductor processes. This will be described later in detail with reference to FIGS. 3A to 3F.

Optionally, the 3D image display apparatus 100 may further include a colored background layer 144. The colored background layer 144 may be formed on the rear surface of the transparent substrate 130 on which the image pattern layer 142 is formed so that two-color images can be displayed through the lens layer 110. In addition, although not shown, a transparent layer (not shown) is formed between the colored background layer 144 and the image pattern layer 142, and thus a depth difference between the image pattern layer 142 and the colored background layer 144 is provided. May cause

Optionally, the 3D image display apparatus 100 may further include a protective layer 150 for protecting the image layer 140 including the image pattern layer 142 and the colored background layer 144 from the outside. . The protective layer 140 is formed on the rear surface of the transparent substrate 130 instead of the colored background layer 144 to form a two-color image and to protect the image pattern layer 142. It may include a protective material having a color different from the color.

3A to 3F are exemplary cross-sectional views for describing a method of manufacturing a 3D image display device including a lenticular sheet according to another exemplary embodiment of the present invention. In order that the invention may be clearly understood, the already described components are not repeated.

Referring to FIG. 3A, a lenticular sheet 160 including a lens layer 110, a UV film layer 120, and a transparent substrate 130 is provided. For ease of explanation, the lens layer 110 is shown below and the transparent substrate 130 is shown above. It is understood that those skilled in the art will understand that the positional relationship is opposite to that shown in FIG. 2A, but does not affect the inventive concept, but is for ease of explanation only.

As described above, the lens layer 110 includes a plurality of convex lenses 112, and the plurality of convex lenses 112 are square or hexagonally arranged as shown in FIG. 2B or 2D, for example. As described above, the UV film layer 120 is used to bond the lens layer 110 and the transparent substrate 130, but the plurality of convex lenses 112 of the lens layer 110 are formed on the transparent substrate 130. Note that when formed in the opposite direction, it may be replaced by a transparent adhesive layer (not shown).

To manufacture the lenticular sheet 160, a lens layer 110 comprising a plurality of convex lenses 112, such as a plurality of hemispherical lenses, is organically molded. The plurality of convex lenses 112 may be made using surface tension when the material of the lens layer 110 is in a liquid state. The material in the liquid state has a curvature with a constant radius of curvature due to the surface tension. As such, the convex lenses 112 having a constant radius of curvature may be manufactured by curing the curvature. The lens layer 110 may be formed of an ultraviolet curable resin similar to the UV film layer 120. For example, the lens layer 110 may be formed of an acrylic ultraviolet curable resin, a silicon based ultraviolet curable resin, a nitrogen based ultraviolet curable resin, or the like. The organic molded lens layer 110 is bonded through the UV film layer 120 on the transparent substrate 130 prepared in advance. The UV film layer 120 is cured by UV irradiation. It should be noted that the process described above is exemplary and may be accomplished through other processes.

Referring to FIG. 3B, a material layer 142 ′ is deposited on the transparent substrate 130. The material layer 142 ′ may be a material including a metal having a specific color. In addition, the material layer 142 ′ may include silver, gold, aluminum, silicon, titanium, chromium, iron, cobalt, nickel, copper, zinc, germanium, zirconium, niobium, molybdenum, palladium, tin, antimony, tantalum, tungsten, It may be made of platinum, bismuth, stainless steel or alloys thereof. In addition, the material layer 142 ′ may be formed by stacking a plurality of metal thin films. For example, in order to emit gold light, the material layer 142 ′ may be formed by stacking a chromium thin film, a titanium thin film, an aluminum thin film, a copper thin film, a silicon thin film, or the like having a thickness of several nanometers. The material layer 142 'may be, for example, chemical vapor deposition (CVD), plasma enhanced CVD (PECVD), high density plasma CVD (HDP-CVD), digital CVD (Digital CVD). CVD), pulsed CVD, atomic layer deposition (ALD) or sputtering.

The photoresist layer 170 is formed on the material layer 142 ′. After supplying the liquid photoresist material on the transparent substrate 130 on which the material layer 142 'is formed, the photoresist layer 170 is rotated on the material layer 142' by rotating the transparent substrate 130 at high speed. It can apply | coat uniformly.

Referring to FIG. 3C, a photoresist pattern 172 is formed on the material layer 142 ′. The photoresist pattern 172 may be formed by performing alignment alignment exposure using a stepper equipped with a reticle on which a pattern corresponding to the image pattern of the image pattern layer 142 is formed, and then developing the developer with a developer. The line width of the photoresist pattern 172 may be 30 μm or less. For example, the line width of the photoresist pattern 172 may be 20 μm. By using a photoresist process, it is known that the line width of the photoresist pattern 172 can be formed as thin as about 1 μm.

Referring to FIG. 3D, an image pattern layer 142 having an image pattern corresponding to the photoresist pattern 172 is formed. The image pattern layer 142 may be formed by etching the material layer 142 ′ using the photoresist pattern 172 as an etching mask. To remove a portion of the material layer 142 ', dry or wet etching, such as reactive ion etching, plasma etching, high-density plasma etching, or the like, may be used. have. Since the photoresist pattern 172 is used as an etching mask, the line width of the image pattern layer 142 may also be 30 μm or less, for example, 20 μm. In addition, the line width of the image pattern layer 142 may be achieved to about 1 μm.

Referring to FIG. 3E, the photoresist pattern 172 formed on the image pattern layer 142 is removed. In order to remove the photoresist pattern 172, an etching process in which the photoresist pattern 172 has a higher etching ratio than that of the image pattern layer 142 and the transparent substrate 130 may be used.

Referring to FIG. 3F, a colored background layer 144 is formed on the transparent substrate 130 on which the image pattern layer 142 is formed. The colored background layer 144 may have a color that can be distinguished from the image pattern layer 142. The colored background layer 144 may be formed using a deposition process such as the material layer 142 ′ described above. However, the colored background layer 144 is to provide a background distinguished from the image pattern layer 142. Since the precise process is not required, it may be formed by applying a material such as paint.

Thereafter, the protective layer (150 of FIG. 2A) is formed on the colored background layer 144 to protect the image pattern layer 142 and the colored background layer 144, thereby displaying the 3D image display device shown in FIG. 2A. 100 can be completed.

It should be noted that the manufacturing method described above with reference to FIGS. 3A to 3F is exemplary, and the present invention is not limited to the above-described method. For example, the UV film layer 120, the colored background layer 144, and / or the protective layer 150 may be omitted. In addition, after the image pattern layer 142 is formed on a separate transparent substrate without forming the image pattern layer 142 on the opposite surface of the lenticular sheet 160 on which the lens layer 110 is formed, A separate transparent substrate may also be formed by adhering to the opposite surface of the lenticular sheet 160. It should be noted that the scope of the present invention is determined not by the above-described embodiments but by the claims below.

4 is a diagram illustrating a relationship between the pitch between the convex lenses 112 and the thickness of the lens layer 110. For easy understanding by those skilled in the art, unlike FIGS. 3A to 3F, convex lenses 112 are formed on the upper surface of the lens layer 110, and an image pattern layer (back) is formed on the rear surface of the lens layer 110. Not shown). In this case, as described above, the focus of the convex lenses 112 should be located on the rear surface of the lens layer 110.

The radius of curvature of the convex lenses 112 may be determined as follows.

Where p is the pitch between the convex lenses 112, or the width of the convex lenses 112, and d is the thickness of the convex lenses 112. The radius of curvature r represents the radius of curvature of the convex lenses 112.

In addition, the thickness of the lens layer 110 when the focus of the convex lenses 112 is located on the rear surface of the lens layer 110 may be determined as follows.

Here, r is the radius of curvature of the convex lenses 112 determined in the above formula, n is the refractive index of the material constituting the lens layer 110 or the convex lenses 112. In addition, the thickness of the lens layer 110 may be equal to the focal length of the convex lenses 112.

As can be seen from the above equations, the thickness t of the lens layer 110 is directly proportional to the radius of curvature r. In addition, when the refractive index n is larger than 1, as the refractive index n becomes larger, the thickness t of the lens layer 110 becomes smaller. However, since the refractive index n of the material forming the lens layer 110 is limited, the radius of curvature r must be reduced to reduce the thickness t of the lens layer.

The radius of curvature r is a function of the pitch p and the thickness d. As described above, since the shape of the convex lens 112 is determined by the surface tension when the substance is in the liquid state, it is difficult to adjust only the thickness d while maintaining the pitch p. Therefore, it will be appreciated that the pitch p must be reduced in order to reduce the radius of curvature r.

In order for the 3D image display apparatus 100 to be applied to various fields, the 3D image display apparatus 100 may be manufactured to be thin. However, as described above, in order to adjust the thickness of the convex lenses 112, the pitch between the convex lenses 112 must be adjusted. In addition, in order to reduce the pitch of the convex lenses 112, the size of the convex lenses 112 must be reduced, which inevitably requires a reduction in the line width of the image pattern layer 142.

In order to achieve a reduction in the line width of the image pattern layer 142, the resolution of the pattern must be precise, and it is difficult to print a precision pattern of 50 μm or less by using offset-off printing, which is one of the existing precision printing methods. The quality is also very poor.

However, when using the etching using the photolithography method of the semiconductor process according to an embodiment of the present invention, a line width of 50 μm or less, for example, 10 to 30 μm, or at least 1 μm may be precisely manufactured. Accordingly, the size and / or pitch of the fine patterns 146 of the image pattern layer 142 may be reduced, and the size and / or pitch of the plurality of convex lenses 112 directly related thereto may be reduced. . Therefore, the thickness of the lens layer 110 may be reduced, and the thin and small size of the 3D image display device 100 may be achieved.

The 3D image display apparatus 100 described so far may be applied to various fields. The 3D image display apparatus 100 may be used for most exteriors used in a portable electronic device as well as a keypad of a mobile phone. Furthermore, the 3D image display apparatus 100 according to the present embodiment requires a 3D image such as a business card, a credit card, a decorative material, a keypad, a packing material, a switch, a sidewalk block, a coaster, a billboard, an interior accessory, a wallpaper, a photograph, a card, and the like. It can be useful for various products.

While the present invention has been described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. will be. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a conceptual diagram illustrating a principle of displaying a stereoscopic image through a 3D image display apparatus including a lenticular.

2A to 2C illustrate a 3D image display device including a lenticular sheet according to an embodiment of the present invention. 2A is a cross-sectional view taken along the line A-A of FIGS. 2B and 2C. FIG. 2B is a plan view from above to illustrate the lens layer of FIG. 2A. FIG. 2C is a plan view from above with the lens layer removed to illustrate the image layer of FIG. 2A.

FIG. 2D is a plan view according to another embodiment as viewed from above to illustrate the lens layer of FIG. 2A.

3A to 3F are exemplary cross-sectional views for describing a method of manufacturing a 3D image display device including a lenticular sheet according to another embodiment of the present invention.

4 is a diagram for illustrating a relationship between a pitch between convex lenses and a thickness of a lens layer.

Explanation of symbols on the main parts of the drawings

100: three-dimensional image display device 110: lens layer

112: convex lenses 120: UV film layer

130: transparent substrate 140: image layer

142: image pattern layer 142 ': material layer

144: colored background layer 146: fine pattern

150: protective layer 160: lenticular sheet

170: photoresist layer 172: photoresist pattern

Claims (12)

A lens layer comprising a plurality of convex lenses arranged in a square or hexagon array; An image pattern layer including a plurality of fine patterns arranged to correspond to the plurality of convex lenses, respectively; And And a transparent substrate coupled between the lens layer and the image pattern. And the image pattern layer is formed by fine patterning a metal layer using a photolithography process. The method of claim 1, And a line width of the image pattern layer is 1 μm to 30 μm. The method of claim 1, And the transparent substrate has a thickness such that the focal points of the plurality of convex lenses are positioned on the plurality of fine patterns, respectively. The method of claim 1, And the pitch of the plurality of convex lenses is the same as the pitch of the plurality of fine patterns. The method of claim 1, And a colored background layer formed on an opposite side of the lens layer with respect to the image pattern layer to display a two-color image through the lens layer. The method of claim 1, And a UV film layer bonded between the lens layer and the transparent substrate. The method of claim 1, The metal layer is silver, gold, aluminum, silicon, titanium, chromium, iron, cobalt, nickel, copper, zinc, germanium, zirconium, niobium, molybdenum, palladium, tin, antimony, tantalum, tungsten, platinum, bismuth, stainless steel Or an alloy thereof. The method of claim 1, And the metal layer is formed of a plurality of metal thin films stacked on each other. The method of claim 1, The 3D image display device is used for any one of a business card, a credit card, a decorative material, a keypad, a packaging material, a switch, a sidewalk block, a coaster and a billboard, or a portable electronic device. Preparing a lenticular sheet having a plurality of rectangular arrays or hexagonal arrays of convex lenses formed on a first surface; Depositing a material layer on a second side of the lenticular sheet opposite the first side; And Fine patterning the material layer using a photolithography process to form a material layer pattern including a plurality of fine patterns arranged to correspond to the plurality of convex lenses, respectively. How to prepare. 11. The method of claim 10, The fine patterning of the material layer using a photolithography process, Forming a photoresist layer on the material layer; Patterning the photoresist layer to form a photoresist pattern; And And etching the material layer to expose a portion of the second surface by using the photoresist pattern as an etching mask. 11. The method of claim 10, And applying a colored material layer on a portion of the second surface and the material layer pattern exposed through the material layer pattern.

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