KR101367530B1 - Multi-functional optical film and method of manufacturing the same - Google Patents

Abstract

A multifunctional optical film is disclosed. The composite functional optical film includes a transparent base layer, a plurality of linear patterns, and a transparent functional layer. The linear patterns protrude from one side of the transparent base layer. The transparent functional layer is positioned on one surface of the base layer to cover the opaque linear patterns, and has a surface on which an antireflective protrusion pattern or an antifouling protrusion pattern is formed. Such multi-function optical films have anti-reflective or antifouling functions as well as information protection functions.

Description

MULTI-FUNCTIONAL OPTICAL FILM AND METHOD OF MANUFACTURING THE SAME

The present invention relates to a method for manufacturing a composite functional optical film, and more particularly, to a composite functional optical film having a reflection prevention or antifouling function as well as an information protection function and a method for manufacturing the same.

Recently, the use of information devices such as smart phones, smart tabs, and notebooks in public places has become common. When using an information device or the like in a public place, personal information displayed on the information device screen or the like may be easily exposed to the surrounding people. Therefore, there is a great demand for a screen configuration to protect the information displayed on the screen of the information device from the surrounding people and to prevent invasion of personal privacy. In order to solve this problem, an optical film attached to a screen such as an information device to limit the viewing angle of the screen of the information device is used.

In order to solve the problem that the user cannot recognize the information on the screen due to the reflection of light when the information device is used outdoors or under lighting, a film is attached to the screen of the information device to prevent the reflection of light. .

In addition, it is common to input or output information by directly touching a finger on a screen of an information device, and to prevent contamination of the screen of the information device by a user's finger or the like, an antifouling film is attached to a screen of an information device. have.

As such, there is a demand for optical films having various functions.

The present invention has been made in view of the above problems, and an object of the present invention is to form a linear pattern therein to exhibit a viewing angle restriction function, and to form an anti-reflective projection pattern or an anti-fouling projection pattern on the surface thereof to prevent reflection or antifouling. It is to provide a method of manufacturing a composite functional optical film that can exhibit the function.

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In order to achieve the above object of the present invention, the composite functional optical film according to the embodiment of the present invention includes a transparent base film, a plurality of opaque first linear patterns and a transparent functional layer. The first linear patterns protrude from one surface of the transparent base film and extend in a first direction. The functional layer is disposed on one surface of the base film to cover the first linear patterns, and has a surface on which an antireflective protrusion pattern or an antifouling protrusion pattern is formed.

In one embodiment of the present invention, it may further include a plurality of opaque second linear patterns protruding from one surface of the transparent base film, extending in a second direction crossing the first direction. The first and second linear patterns may be made of an opaque resin, a metal ink, a carbon black ink, a carbon nanotube ink, a metal, or a metal oxide.

The antireflective protrusion pattern may be a moth-eye nano structure including protrusions having a scale smaller than the wavelength of light.

In order to achieve the above object of the present invention, the method of manufacturing a multi-function optical film according to an embodiment of the present invention is (i) a plurality of first opaque on one side of the transparent base film and protruded from one side of the base film Forming a linear pattern, (ii) applying a transparent resin material on one surface of the base film to cover the linear patterns, and (iii) a first stamp having a negative pattern having a circular or polygonal cross-section. It may include the step of forming an anti-reflective projection pattern or antifouling projection pattern on the surface of the transparent resin material through the nanoimprint lithography process using.

In one embodiment of the present invention, the nanoimprint lithography process using a second stamp to apply a non-cured opaque resin material on one surface of the base film, the linear intaglio pattern to form the first linear patterns The opaque resin material can be patterned through.

In another embodiment of the present invention, metal or the first linear intaglio patterns of the first mold having one surface on which the first linear intaglio patterns extending in the first direction are formed to form the first linear patterns. Filling a first solution including at least one selected from metal oxide particles, carbon black particles, and carbon nanotubes, and placing the base film on one surface of the first mold having the first linear engraved patterns; The first solution may be heated while pressing the base film toward the first mold, and the first mold may be separated from the base film.

In one embodiment of the present invention, after forming the first linear patterns and before applying the transparent resin material, intersect the first linear patterns on one side of the base film and protrude from one side of the base film. The method may further include forming a plurality of second opaque linear patterns. Metal or metal oxide particles in the second linear intaglio pattern of the second mold having one surface on which second linear intaglio patterns extending in a second direction intersecting the first direction are formed to form the second linear patterns. One side of the base film by filling the second solution including at least one of carbon black particles and carbon nanotubes, and the first metal ink on one side of the second mold on which the second linear engraved pattern is formed. Positioning the base film so that the linear pattern formed on the second mold faces the second mold, heating the second solution while pressing the base film in the direction of the second mold, and separating the second mold from the base film. Can be.

According to the multi-function optical film and the manufacturing method thereof according to an embodiment of the present invention, by forming a linear pattern between the base film and the transparent functional layer can not only exhibit the function of limiting the viewing angle or polarizing function, but also on the surface of the functional layer By forming the antireflection projection pattern or the antifouling projection pattern, the antireflection function or the antifouling function can also be exhibited.

In addition, fine patterns may be easily formed by forming linear patterns, anti-reflective projection patterns, and antifouling projection patterns using the nanoimprint lithography method.

1 is a cross-sectional view for explaining a multi-function optical film according to Example 1 of the present invention.
FIG. 2 is a perspective view illustrating the linear patterns illustrated in FIG. 1.
3A to 3I are cross-sectional views illustrating one embodiment of a method of manufacturing a composite functional optical film according to Example 1 of the present invention.
4A to 4C are cross-sectional views illustrating another embodiment of a method of manufacturing a multifunctional optical film according to Example 1 of the present invention.
5 is a cross-sectional view for explaining a multi-function optical film according to Example 2 of the present invention.
FIG. 6 is a perspective view illustrating the grid pattern shown in FIG. 5.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. In the accompanying drawings, the sizes and the quantities of objects are shown enlarged or reduced from the actual size for the sake of clarity of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the terms "comprise", "comprising", and the like are intended to specify that there is a feature, step, function, element, or combination of features disclosed in the specification, Quot; or " an " or < / RTI > combinations thereof.

On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Example 1

<Compound Optical Film 1>

1 is a cross-sectional view illustrating a multi-function optical film according to Example 1 of the present invention, and FIG. 2 is a perspective view illustrating the linear patterns shown in FIG. 1.

1 and 2, the multifunctional optical film 100 according to Embodiment 1 of the present invention may include a base film 110, a plurality of linear patterns 120, and a functional layer 130. .

The base film 110 may be formed of a transparent polymer material. For example, the base film 110 may be made of polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyacrylate, polymethylmethacrylate, polyurethane, polycarbonate, polyethylene, polypropylene, cellulose acetate butylate ( CAB), two or more of these copolymers, and the like.

The plurality of linear patterns 120 may be formed to protrude from one surface of the base film 110. The linear patterns 120 may function as a viewing angle restriction pattern for limiting the viewing angle or a polarization pattern for polarizing light for information protection. When the linear patterns 120 function as the viewing angle restriction pattern, the linear patterns 120 may have a width and a height of a micron scale (several to several tens of micrometers), and may be formed in the same shape. When the linear patterns 120 function as polarization patterns, the linear patterns 120 may have a width and a height of a nanoscale, and may be formed in the same shape.

The plurality of linear patterns 120 may be arranged to be parallel to each other and spaced apart from each other at a predetermined interval. The linear patterns 120 are preferably formed of an opaque material through which light is not transmitted. For example, the linear patterns 120 may be formed of opaque imprint resin, metal ink, carbon black ink, carbon nanotube ink, metal, metal oxide, or the like. The opaque imprint resin is prepared by mixing opaque pigment particles, metal nanoparticles, carbon black, carbon nanotubes, and the like in a transparent imprint resin such as an acrylate resin, an M-PDMS resin, a polyurethane acrylate resin, or the like. can do. Since the linear patterns 120 are formed of an opaque material, a region in which the linear patterns 120 are formed constitutes a non-transmissive region of the multifunctional optical film 100, and a region between the linear patterns 120 is a composite function. The transmission region of the optical film 100 is configured.

In terms of the aperture ratio of the composite function optical film 100, the linear patterns are arranged such that the ratio (a: b) of the width (a) of the non-transmissive area and the width (b) of the transmission area is about 1: 1 or more and about 1: 9 or less. It is desirable to form 120. When the ratio (a: b) of the width of the non-transmissive area and the width of the transmissive area is less than 1: 1, the aperture ratio is less than 50%, which may cause a problem that is difficult for a user to recognize the screen through the multifunctional optical film 100. Can be. In addition, even if the ratio (a: b) of the width (a) of the non-transmissive region to the width (b) of the transmissive region exceeds 1: 9, there is no substantial increase in the aperture ratio of the multifunctional optical film 100, but the non-transmissive region constitutes the non-transmissive region. There is a problem in that it is difficult to manufacture the linear patterns 120.

When the composite function optical film 100 functions as an information protection film, the ratio (b: c) of the width (b) of the transmission area and the height (c) of the linear patterns 120 is weak in view of viewing angle limitation. It is preferable to form the linear patterns 120 to be 1: 0.333 or more and about 1: 6 or less. When the ratio (b: c) of the width b of the transmissive region and the height c of the linear patterns 120 is less than 1: 0.333, the viewing angle limitation is almost ineffective, and when the ratio exceeds 1: 6, While there is little increase in viewing angle restriction angle, there is a problem in that the manufacturing of the linear patterns 120 becomes difficult.

The functional layer 130 is formed on one surface of the base film 110 to cover the linear patterns 120. The functional layer 130 is preferably formed of a transparent material. For example, the functional layer 130 may be formed of a transparent imprint resin such as an acrylate-based resin, an M-PDMS-based resin, a polyurethane acrylate-based resin, or the like. In particular, the functional layer 130 is preferably formed of a material having a hard surface strength so that the functional layer 130 can also have a scratch resistance. For example, the functional layer 130 may be formed of a transparent UV curable resin. An anti-reflection or antifouling protrusion pattern 130a may be formed on the surface of the functional layer 130.

The anti-reflection protrusion pattern 130a may be formed on a scale smaller than the wavelength of visible light, for example, nanoscale. In one example, the anti-reflective protrusion pattern 130a may include a moth-eye nano structure. Moss-eye nanostructures are designed to mimic the eyes of nocturnal insects, such as moths, because the slanted projections are aligned so that they do not reflect light regardless of the angle of incidence and wavelength of light. In Mohs-eye nanostructures, the refractive index from the resin to the air is gradually changed to minimize the reflection on the surface of the resin.

The antifouling protrusion pattern 130a is a protrusion pattern for reducing the contact area between the user's finger and the functional layer 130, and the shape or shape thereof is not particularly limited. In addition, the antifouling protrusion pattern 130a may be formed to be regularly or irregularly arranged.

<Method 1 for Manufacturing Composite Optical Film>

3A to 3I are cross-sectional views illustrating one embodiment of a method of manufacturing a composite functional optical film according to Example 1 of the present invention.

Referring to FIG. 3A, an opaque resin layer 120 ′ is formed on one surface of a transparent base film 110 in order to manufacture a composite functional optical film. The opaque resin layer 120 ′ may be formed of an opaque imprint resin. The opaque imprint resin can be a thermoplastic polymer, a thermosetting prepolymer or a UV curable prepolymer.

When the opaque resin layer 120 'is made of a thermoplastic polymer, the opaque resin layer 120' may be formed by spin-coating.

In contrast, when the opaque resin layer 120 'is made of a thermosetting prepolymer or a UV curable prepolymer, the opaque resin layer 120' may be formed by a method of dispensing. Although FIG. 3A illustrates an opaque resin layer 120 ′ formed at a predetermined thickness on one surface of the base film 110, the opaque resin layer 120 ′ is formed when the opaque resin layer 120 ′ is formed by a dispensing method. ) May be agglomerated on a portion of one surface of the base film 110.

Referring to FIG. 3B, after the opaque resin layer 120 ′ is formed, the second stamp 10 is positioned on the opaque resin layer 120 ′. On one surface of the second stamp 10 facing the opaque resin layer 120 ′, linear intaglio patterns 10a having a width and a depth of nanoscale or several to tens of microns are formed. The linear intaglio patterns 10a formed in the second stamp 10 have the same shape and are spaced apart from each other in parallel and at regular intervals.

When the opaque resin layer 120 'is formed of a thermoplastic resin or a heat curable prepolymer, the second stamp 10 may be made of an opaque material or a transparent material, but the opaque resin layer 120' may be a UV curable prepolymer. When formed, the second stamp 10 is made of a transparent material that can transmit ultraviolet rays.

Referring to FIG. 3C, after placing the second stamp 10 on the opaque resin layer 120 ′, the second stamp 10 is pressed in the direction of the base film 110.

When the opaque resin layer 120 ′ is formed of a thermoplastic polymer, the base resin layer may be first heated and softened to a temperature above the glass transition temperature (Tg) of the thermoplastic polymer, and then the second stamp 10 may be pressed. The thermoplastic polymer is cooled while the second stamp 10 is fully pressed so that opaque linear patterns 120 ″ corresponding to the intaglio shape of the second stamp 10 can be maintained on the base film 110. do.

When the opaque resin layer 120 'is formed of a thermosetting prepolymer or a UV curable prepolymer, the opaque resin layer 120' has an uncured state, that is, has a relatively low viscosity, thereby heating the opaque resin layer 120 '. The second stamp 10 can be pressurized without doing so. However, in this case, the second stamp 10 may be pressurized in a vacuum state so that the thermosetting prepolymer or the UV curable prepolymer may evenly penetrate the intaglio pattern of the second stamp 10. When the opaque resin layer 120 ′ is formed of a thermosetting prepolymer, the second stamp 10 may be hardened by applying heat to the thermosetting prepolymer while fully pressing the second stamp 10. When the opaque resin layer 120 ′ is formed of a UV-curable prepolymer, the UV-curable prepolymer may be cured by irradiating UV-curable prepolymer while the second stamp 10 is fully pressurized. The ultraviolet light may be irradiated to the UV curable prepolymer through the transparent second stamp 10.

Referring to FIG. 3D, the second stamp 10 is separated from the patterned opaque resin layer 120 ″. When the second stamp 10 is separated, opaque linear patterns 120 ″ having a shape corresponding to the intaglio pattern 10 a formed on the second stamp 10 are formed on one surface of the base film 110. In this case, residual polymer material may exist in the region between the linear patterns 120 ″.

Referring to FIG. 3E, the polymer material remaining in the region between the linear patterns 120 ″ may be removed using a method of reactive ion etching or plasma etching. Of course, it is also possible to adjust the amount, viscosity, and the like of the resin material forming the opaque resin layer 120 'such that the polymer material does not remain in the region between the linear patterns 120' '. In this case, the step of removing residual polymer material by using a method of reactive ion etching or plasma etching can be omitted.

Referring to FIG. 3F, after the opaque linear patterns 120 are formed on one surface of the base film 110, a transparent resin material may be formed on one surface of the base film 110 to cover the linear patterns 120. 130 '). The transparent resin material 130 ′ may be formed of a transparent imprint resin. The transparent imprint resin can be a thermoplastic polymer, a thermoset prepolymer or a UV curable prepolymer. The transparent imprint resin is preferably a thermosetting prepolymer or a UV curable prepolymer so that the functional layer 130 formed from the transparent resin material 130 ′ may have hard physical properties. The transparent imprint resin is more preferably a UV curable prepolymer so that the functional layer 130 formed from the transparent resin material 130 'can have a hard surface strength. When the transparent resin material 130 'is made of a thermosetting prepolymer or a UV curable prepolymer, the transparent resin material 130' may be applied by a method of dispensing. Alternatively, when the transparent resin material 130 ′ is made of a thermoplastic polymer, the transparent resin material 130 ′ may be applied by spin-coating.

Referring to FIG. 3G, after applying the transparent resin material 130 ′, the first stamp 20 is positioned on the transparent resin material 130 ′. On one surface of the first stamp 20 facing the transparent resin material 130 ′, intaglio patterns 20a having a nanoscale size and having a circular or polygonal cross section and arranged regularly or irregularly are formed.

When the transparent resin material 130 ′ is formed of a UV curable prepolymer, the first stamp 20 is preferably made of a transparent material through which ultraviolet rays can pass. In contrast, when the transparent resin material 130 ′ is formed of a thermoplastic resin or a heat curable prepolymer, the first stamp 20 may be made of an opaque material or a transparent material.

Referring to FIG. 3H, after placing the first stamp 20 on the transparent resin material 130 ′, the first stamp 20 is pressed in the direction of the base film 110.

When the transparent resin material 130 'is formed of a UV curable prepolymer or a thermosetting prepolymer, the transparent resin material 130' has an uncured state, that is, has a relatively low viscosity, thereby heating the transparent resin material 130 '. The first stamp 20 is pressed without pressure. When the transparent resin material 130 ′ is formed of a UV curable prepolymer, the UV curable prepolymer may be cured by irradiating ultraviolet rays with the first stamp 20 fully pressed. The ultraviolet light may be irradiated to the UV curable prepolymer through the transparent first stamp 20. When the transparent resin material 130 ′ is formed of a thermosetting prepolymer, the first stamp 20 may be hardened by applying heat to the thermosetting prepolymer while fully pressing the first stamp 20.

On the other hand, when the transparent resin material 130 'is formed of a thermoplastic polymer, the transparent resin material 130' is first heated and softened to a temperature higher than or equal to the glass transition temperature (Tg) of the thermoplastic polymer, and then the first stamp 20 is softened. Can be pressurized. The thermoplastic polymer is cooled while the first stamp 20 is fully pressed to maintain the anti-reflective projection patterns or antifouling projection patterns corresponding to the intaglio shape of the first stamp.

Referring to FIG. 3I, the first stamp is separated from the patterned transparent resin material 130 ″. When the first stamp 20 is separated, the anti-reflective protrusion patterns 130a or the antifouling protrusion patterns 130a having a shape corresponding to the intaglio pattern formed on the first stamp 20 may be formed on the surface of the transparent resin material 130. ) Is formed.

<Manufacturing Method 2 of Composite Function Optical Film>

4A to 4C are cross-sectional views illustrating another embodiment of a method of manufacturing a multifunctional optical film according to Example 1 of the present invention.

Referring to FIG. 4A, a first mold 30 in which linear engraved patterns 30a having a width and a depth of nanoscale or several to several tens of microns is formed. The linear intaglio patterns 30a formed in the first mold 30 may have the same shape, and may be spaced apart from each other in parallel and at regular intervals. Subsequently, the intaglio patterns 30a of the first mold 30 are filled with a first solution 40 including at least one of metal or metal oxide particles, carbon black, and carbon nanotubes and a solvent. The metal and metal oxide constituting the particles are not particularly limited as long as they can form a pattern that can block light. The first solution 40 may be filled in the intaglio pattern 30a of the first mold 30 by spin coating. In order to fill the intaglio pattern 30a with the first solution 40 by spin coating, the first mold 30 may be supported by the silicon substrate 50.

Referring to FIG. 4B, the first solution 40 is filled in the intaglio pattern 30a of the first mold 30, and then the base film 110 of the first mold 30 in which the intaglio pattern 30a is formed. After the upper surface is positioned on one side, the base film 110 is pressed in the direction of the first mold 30. Heat is applied to the first solution 40 while the base film 110 is pressed to remove the solvent and other organic components included in the first solution. For example, in order to remove the solvent and other organic components included in the first solution, the first solution 40 may be heated at a temperature of about 250 ° C. for about 30 minutes using a hot plate.

Referring to FIG. 4C, the base film 110 is separated from the first mold 30 after heat is applied to the first solution 40 to remove the solvent and other organic components included in the first solution 40. Linear patterns 120 having a shape corresponding to the intaglio pattern 30a of the first mold 30 are formed on the separated base film 110.

Thereafter, the transparent functional layer covering the linear patterns 120 by the same or similar process as described with reference to FIGS. 3F to 3I and having the anti-reflective protrusion pattern 130a or the antifouling protrusion pattern 130a formed on the surface thereof. 130 may be formed.

Example 2

<Multifunctional Optical Film 2>

FIG. 5 is a cross-sectional view for describing the multi-function optical film according to Example 2 of the present invention, and FIG. 6 is a perspective view for explaining the grating pattern shown in FIG. 5.

5 and 6, the multifunctional optical film 200 according to Embodiment 2 of the present invention may include a base film 210, a grating pattern 220, and a functional layer 230. The base film 210 and the functional layer 230 except for the lattice pattern 220 may include the base film 110 and the function of the composite functional optical film 100 according to Embodiment 1 described with reference to FIGS. 1 and 2. Since they are substantially the same as or similar to those of the layer 130, detailed descriptions thereof will be omitted, and the grating pattern 220 will be described in detail below.

The grid pattern 220 may include a plurality of first linear patterns 221 extending in a first direction and a plurality of second linear patterns 223 extending in a second direction crossing the first direction. . The first linear patterns 221 function to limit the viewing angle in the second direction, and the second linear patterns 223 function to limit the viewing angle in the first direction.

The first linear patterns 221 may have the same width and height as each other on the nanoscale or the scale of several tens of microns. The first linear patterns 221 may be spaced apart from each other by a predetermined interval. The second linear patterns 223 may also have the same width and height as each other on the nanoscale or the scale of several tens of microns. In addition, the second linear patterns 223 may also be spaced apart from each other by a predetermined interval. The width and height of the first linear pattern 221 may be the same as or different from the width and height of the second linear pattern 223. In addition, the separation distance between the first linear patterns 221 may be the same as or different from the separation distance between the second linear patterns 223.

The first and second linear patterns 221 and 223 may be formed of metal ink, carbon black ink, carbon nanotube ink, metal or metal oxide.

<Method 3 for Manufacturing Composite Optical Film>

In order to manufacture the composite functional optical film 200 according to the second embodiment of the present invention, first, a grid pattern 220 may be formed on one surface of the base film 210. In order to form the grating pattern 220, first linear patterns 221 may be formed in the same or similar process to that described with reference to FIGS. 4A through 4C. Next, a second linear intersecting the first linear patterns 221 in the same or similar process to the process described with reference to FIGS. 4A to 4C on one surface of the base film 210 on which the first linear patterns 221 are formed. Patterns 223 may be formed. For example, the second linear patterns 223 may be formed to be orthogonal to the first linear patterns 221.

Subsequently, the lattice pattern 220 is covered on one surface of the base film 210 on which the lattice pattern 220 is formed by the same or similar process to that described with reference to FIGS. 3F to 3I, and the anti-reflection pattern 230a is formed on the surface of the base film 210. ) Or the transparent functional layer 230 in which the antifouling protrusion pattern 230a is formed.

According to the above-described composite functional optical film and a method of manufacturing the same, by forming a linear pattern or a lattice pattern between the base film and the transparent functional layer can not only exhibit a function of limiting the viewing angle or polarizing function, but also prevent reflection on the surface of the functional layer. The antireflection function or the antifouling function can also be exhibited by forming the projection pattern or the antifouling projection pattern.

In addition, fine patterns may be easily formed by forming a linear or lattice pattern, an antireflective protrusion pattern, and an antifouling protrusion pattern using a nanoimprint lithography method.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

Claims (8)

delete delete delete delete Forming a plurality of first linear patterns opaque on one side of the transparent base film and protruding from one side of the base film;
Applying a transparent resin material on one surface of the base film to cover the linear patterns as a whole;
A nano-imprint lithography process using a first stamp having an intaglio pattern having a circular or polygonal cross section is provided on the surface of the transparent resin material. forming an antireflective protrusion pattern having an eye nano structure,
Forming the first linear patterns,
Applying an opaque resin material to one surface of the base film;
And patterning the opaque resin material through a nanoimprint lithography process using a second stamp having linear intaglio patterns. delete The method of claim 5, wherein the forming of the first linear patterns comprises:
A first material including at least one of metal or metal oxide particles, carbon black particles, and carbon nanotubes in the first linear intaglio patterns of the first mold having one surface having first linear intaglio patterns extending in a first direction; 1 filling the solution;
Positioning the base film on one surface of the first mold in which the first linear engraved pattern is formed;
Heating the first solution while pressing the base film in the first mold direction; And
And separating the first mold from the base film. The method of claim 7, wherein the first linear patterns intersect the first linear patterns on one side of the base film and protrude from one side of the base film after forming the first linear patterns and before applying the transparent resin material. Further comprising forming a plurality of second linear patterns,
Forming the second linear patterns,
Among the metal or metal oxide particles, carbon black particles, and carbon nanotubes in the second linear intaglio patterns of the second mold having one surface on which second linear intaglio patterns extending in a second direction intersecting the first direction are formed. Filling a second solution comprising at least one selected;
Positioning the base film on one surface of the second mold on which the second linear engraved patterns are formed such that the first linear patterns face the second mold;
Heating the second solution while pressing the base film in the second mold direction; And
And separating the second mold from the base film.

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