KR101689393B1 - Apparatus for displaying photonic crystral and producing method of same - Google Patents

Apparatus for displaying photonic crystral and producing method of same Download PDF

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KR101689393B1
KR101689393B1 KR1020150044452A KR20150044452A KR101689393B1 KR 101689393 B1 KR101689393 B1 KR 101689393B1 KR 1020150044452 A KR1020150044452 A KR 1020150044452A KR 20150044452 A KR20150044452 A KR 20150044452A KR 101689393 B1 KR101689393 B1 KR 101689393B1
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particles
light absorbing
light
solvent
magnetic
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KR1020150044452A
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KR20150063319A (en
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장보승
이동진
주재현
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주식회사 나노브릭
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G02F1/091—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect based on magneto-absorption or magneto-reflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/369—Magnetised or magnetisable materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
    • G01D15/12—Magnetic recording elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/37—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements
    • G09F9/375—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements the position of the elements being controlled by the application of a magnetic field

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Credit Cards Or The Like (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Organic Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Printing Methods (AREA)
  • Soft Magnetic Materials (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Abstract

The present invention relates to a photonic crystal display device and a manufacturing method of the photonic crystal display device. A photonic crystal display device according to the present invention is a photonic crystal display device including a display area 100. The display area 100 includes a plurality of magnetic particles 11 A plurality of light absorbing particles 20 capable of absorbing incident light and a solvent 12 in which a plurality of magnetic particles 11 and a plurality of light absorbing particles 20 are dispersed.

Description

TECHNICAL FIELD [0001] The present invention relates to a photonic crystal display device and a manufacturing method of a photonic crystal display device,

The present invention relates to a photonic crystal display device and a manufacturing method of the photonic crystal display device. More specifically, by arranging a plurality of magnetic particles constituting a photonic crystal and light absorbing particles capable of absorbing incident light in a display area of a photonic crystal display device, a photonic crystal display in which color, visibility, And a manufacturing method of the photonic crystal display device.

Generally, a microcapsule means a structure in which solid, liquid or gaseous core material containing fine particles is sealed with a small vessel (shell) material having a size of several hundred micrometers. Particularly, in the fields of the display field, forgery prevention apparatus, etc., microcapsules can be used in combination with a light-transmitting film.

On the other hand, various technologies have been introduced to prevent the forgery and alteration of a product which requires high authenticity of goods or contents. Conventionally, technologies using fine patterns, braille, hologram, RFID, etc. have been used to prevent forgery and alteration of products, but such conventional technology has the limitation that it is not easy for a general user to discriminate whether or not a product is falsified or altered And it has a problem that it is expensive to manufacture and manufacture counterfeit and tamper proof means.

Accordingly, the present inventor has proposed a photonic crystal display device that allows a general user to easily determine whether or not a falsification and an object to be altered are falsified or altered by using a material whose color changes or light transmittance changes as a magnetic field is applied Prevention device] has been developed.

1 is a view showing a conventional photonic crystal display device.

1 (a), the photonic crystal display device developed by the present inventor includes a magnetoresistive material 10 in the form of a capsule 13 encapsulating a solvent 12 in which a plurality of magnetic particles 11 are dispersed An upper substrate 2, a black sheet 5, an adhesive layer (not shown) provided in the display area 1 and providing an adhesion between the display area 1 and the black sheet 5 3 and the lower substrate 4, and the like.

The black sheet 5 is formed by superimposing the light reflected by the magnetostrictive material 10 that functions as a photonic crystal in the display area 1 and the light that is transmitted through the magnetostrictive material 10 and reflected by the black sheet 5 It is possible to apply the present invention to a photonic crystal display device for the purpose of improving color, visibility, etc. However, it is difficult to fundamentally prevent interference and distortion caused by the surface reflection of each component in the photonic crystal display device, and the manufacturing cost is increased when the black sheet 5 is applied, and the thickness of the entire photonic crystal display device is increased .

1 (b), the magnetostrictive material 10 'can be individually handled without covering layers such as the upper substrate 2 and the lower substrate 5 shown in FIG. 1 (a) , And a capsule 13 'sealed with a hard shell. When such a magnetostrictive material 10 'is used, the black sheet 5 is applied on a planar substrate as shown in Fig. 1 (a) to prevent overlapping or interference of light, There is a problem in that it is difficult to employ a component having the same function as the black sheet 5 in addition to the base sheet.

It is an object of the present invention to solve all the problems described above.

An object of the present invention is to provide a photonic crystal display device and a manufacturing method of a photonic crystal display device in which light absorbing particles are dispersed in a display area so that incident light transmitted through a plurality of magnetic particles can be immediately absorbed.

It is another object of the present invention to provide a photonic crystal display device and a manufacturing method of a photonic crystal display device which can prevent problems such as optical interference and distortion in a display area with light absorbing particles.

It is another object of the present invention to provide a photonic crystal display device and a manufacturing method of a photonic crystal display device in which light absorbing particles are dispersed in a display area of the present invention to lower the manufacturing cost and reduce the thickness.

The above object of the present invention is achieved by a photonic crystal display device including a display region,

Wherein the display region includes a plurality of magnetic particles that move in accordance with a change in an external magnetic field and change in spacing therebetween, a plurality of light absorbing particles capable of absorbing incident light, and a plurality of light absorbing particles The present invention provides a photonic crystal display device comprising a solvent in which particles are dispersed.

It is another object of the present invention to provide a magnetic recording medium comprising a plurality of magnetic particles moving in accordance with a change in an external magnetic field and having a gap therebetween and having a plurality of light absorbing particles capable of absorbing incident light dispersed therein, And the light-emitting layer is mixed and included in the display region.

The above-described object of the present invention is also achieved by a magnetic recording medium comprising a plurality of capsules encapsulating a solvent in which a plurality of magnetic particles dispersed in a magnetic permeable material, And a light absorbing material capable of absorbing incident light is coated on at least a part of the surface of the photonic crystal display device.

According to another aspect of the present invention, there is provided a method of manufacturing a magnetic recording medium, comprising the steps of: (a) preparing a capsule encapsulating a solvent in which a plurality of magnetic particles dispersed in a magnetic permeable material, (b) attaching the capsule to a display portion substrate; And (c) coating a light absorbing material capable of absorbing light incident on at least a part of the remaining surface except for the surface of the capsule in contact with the display part base material. ≪ / RTI >

According to another aspect of the present invention, there is provided a method of manufacturing a magnetic recording medium, comprising the steps of: (a) preparing a capsule encapsulating a solvent in which a plurality of magnetic particles dispersed in a magnetic permeable material, (b) coating a light absorbing material capable of absorbing light incident on at least a portion of any of the mating objects; And (c) attaching the capsule onto a part of the mounter coated with the light absorbing material.

INDUSTRIAL APPLICABILITY According to the present invention, there is an effect that light absorbing particles can be dispersed in a display area, and incident light transmitted through a plurality of magnetic particles can be immediately absorbed.

According to the present invention, it is possible to prevent problems such as optical interference and distortion in the display region from being caused by the light absorbing particles.

According to the present invention, there is an effect that the light absorbing particles are dispersed in the display area, the manufacturing cost is reduced, and the thickness is reduced.

1 is a view showing a conventional photonic crystal display device.
2 is a diagram illustrating a principle of controlling a wavelength of light reflected from a magnetostrictive material according to an embodiment of the present invention.
FIG. 3 is a diagram showing a result of photographing a color change of a magnetostrictive material when a magnetic field of various intensities is applied according to an embodiment of the present invention.
FIG. 4 is a graph illustrating a wavelength of light reflected from a magnetoresistive material according to an intensity of a magnetic field according to an embodiment of the present invention.
FIG. 5 (a) is a SEM photograph of magnetic particles constituting a magnetostrictive material according to an embodiment of the present invention. FIG. 5 (b) is a view showing that a magnetic variable material according to an embodiment of the present invention is encapsulated into a capsule made of a light-transmitting material, and then a magnetic field is applied to reflect green light.
FIG. 6 is a view illustrating a state in which a butterfly-shaped pattern is formed on a magnetic variable material according to an embodiment of the present invention, and a magnet having alternately formed magnetic stripes in a stripe shape Fig. 5 is a photograph showing a change in the hue and pattern of the magnetostrictive material as the magnet is rotated. Fig.
7 is a diagram illustrating a configuration in which a light transmittance of a magnetostrictive material is changed according to an embodiment of the present invention.
8 is a view showing a basic configuration of a photonic crystal display device according to an embodiment of the present invention.
9 to 12 are views showing a photonic crystal display device according to various embodiments of the present invention.
13 is a view showing a process of manufacturing the photonic crystal display device of FIG.
14 is a view showing a process of coating a photocrystal display device of the present invention on an arbitrary object.
15 is a view showing a photonic crystal display device according to another embodiment of the present invention.
16 is a view showing a process of manufacturing the photonic crystal display device of FIG.
17 is a view showing a process of coating a photocrystal display device according to another embodiment of the present invention on an arbitrary object.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention.

The photonic crystal display device of the present invention is described on the assumption that the photonic crystal display device is used as a forgery preventing device or a forgery-proofing sticker, but the present invention can be applied to the display field as well.

[Composition of magnetic variable material]

According to an embodiment of the present invention, the particles included in the magnetorptive material may have magnetic properties such that they can be rotated or moved by receiving a magnetic force by a magnetic field. For example, nickel, iron, cobalt Co) may be included in the particles.

Also, according to one embodiment of the present invention, the particles may include a material that becomes magnetized as the magnetic field is applied, that is, magnetized. Particularly, according to an embodiment of the present invention, when an external magnetic field is applied to prevent a phenomenon of aggregation of particles having magnetism in the case where a magnetic field is not externally applied, magnetization occurs but an external magnetic field is not applied A superparamagnetic material which does not cause remnant magnetization can be used.

Also, according to one embodiment of the present invention, in order to prevent the particles from being well dispersed in the solvent and agglomerate, the surface of the particles can be coated with the charge of the same sign, The particles may be coated with a material having a different specific gravity, or a solvent may be mixed with a material having a specific gravity different from that of the grains.

Further, according to one embodiment of the present invention, the particles can be configured to reflect light of a specific wavelength, that is, to have a specific color. More specifically, the particles according to the present invention may have a specific color through controlling the oxidation water or coating such as inorganic pigment, pigment and the like. For example, Zn, Pb, Ti, Cd, Fe, As, Co, Mg, Al and the like including a chromophore may be used in the form of oxides, emulsions and lactates as inorganic pigments coated on the particles according to the present invention , A fluorescent dye, an acid dye, a basic dye, a mordant dye, a sulfide dye, a bat dye, a disperse dye, a reactive dye and the like may be used as the dye coated on the particles according to the present invention. In addition, according to an embodiment of the present invention, the particles included in the magnetic variable material may include a fluorescent material, a phosphorescent material, a quantum dot material, a temperature indicating material, an optically variable pigment (OVP) And the like.

According to an embodiment of the present invention, silica, polymer, polymer monomer, etc. may be coated on the surface of the particles so that the particles have high dispersibility and stability in a solvent.

On the other hand, the diameter of the particles according to the present invention may be several tens of nanometers to several tens of micrometers, but is not limited thereto.

Next, the constitution of the solvent included in the magnetorptive material according to the present invention will be described in detail as follows.

According to one embodiment of the present invention, the solvent may be composed of a material having a specific gravity similar to the specific gravity of the particles so that the particles can be uniformly dispersed, and is composed of a material suitable for stable dispersion of the particles in the solvent For example, halogen carbon oil having a low dielectric constant, dimethyl silicone oil, and the like.

Further, according to one embodiment of the present invention, the solvent can be configured to reflect light of a specific wavelength, that is, to have a specific color. More specifically, the solvent according to the present invention may include an inorganic pigment, a substance having a dye, or a substance having a structural color by a photonic crystal.

In addition, according to one embodiment of the present invention, by uniformly dispersing the magnetic particles in the fat-soluble solvent, it is possible to prevent the particles from clumping together or sticking to the inner wall of the capsule in the encapsulation process.

However, it is to be understood that the constitution of the particles and the solvent according to the present invention is not limited to those listed above, but can be appropriately changed within the scope of achieving the object of the present invention.

Next, the configuration of encapsulating or partitioning the particles and the solvent contained in the magnetorptive material according to the present invention will be described in detail.

According to one embodiment of the present invention, the particles may be encapsulated in a plurality of capsules made of a light-transmissive material in a dispersed state in a solvent. According to an embodiment of the present invention, it is possible to prevent direct interference such as mixing of different capsules by encapsulating the particles and the solvent, thereby controlling the particles contained in the magnetic variable material independently for each capsule As a result, it is possible to control the light transmission of a wider variety of patterns, and to make the light transmittance control property more excellent.

For example, gelatin, acacia, melamine, urea, protein, polysaccharide and the like may be used as the material constituting the capsule according to an embodiment of the present invention, and a substance (that is, a binder) . However, the constitution of the capsules according to the present invention is not necessarily limited to the above-mentioned examples, and any substance which is light-permeable, physically strong, rigid, elastic, porous and resistant to external heat and pressure, May be used as the material of the capsule.

Further, according to one embodiment of the present invention, the particles can be partitioned in a dispersed state in a solvent. According to an embodiment of the present invention, it is possible to prevent direct interference, such as mixing, between different cells divided by the partition, thereby preventing the particles included in the magnetic variable substance- And can be independently controlled.

2 is a diagram illustrating a principle of controlling the wavelength of light reflected from the magnetorptive material 10 according to an embodiment of the present invention.

According to an embodiment of the present invention, when a magnetic field is applied to a plurality of particles 11 having magnetism and having electric charges on their surfaces, magnetic particles 11 are magnetized in a predetermined direction The distance between the particles 11 shifted to one side is narrowed, and at the same time, the electric repulsive force by the Coulomb's law acts between the particles 11 (when the particles have the same surface charge) ) Physical repulsion due to the effect of steric hindrance is applied (when the hydrodynamic size of the particles is large due to the detection function attached to the surface of the particles). Accordingly, the spacing of the particles 11 can be determined according to the relative strength of the repulsion between particles due to the attractive force due to the magnetic field, and accordingly, the particles 11 arranged at predetermined intervals can function as photonic crystals . That is, according to the Bragg's law, since the wavelength of the light reflected from the particles 11 is determined by the interval of the particles 11, the wavelength of the light reflected from the particles 11 is controlled by controlling the interval of the particles 11 It can be adjusted.

Here, the pattern of the wavelength of the reflected light may be variously varied depending on factors such as the intensity and direction of the magnetic field, the size and mass of the particles, the refractive index of the particles and the solvent, the magnetization value of the particles, the charge amount of the particles, .

2, when the magnetic field is not applied, the particles 11 in the capsule 13 may be irregularly arranged. In this case, the particles 11 are not colored. Next, when a predetermined magnetic field is applied, the particles 11 can be regularly arranged at predetermined intervals while the repulsive force between the particles 11 due to attraction due to the magnetic field is balanced, It becomes possible to reflect light of a specific wavelength from a plurality of controlled particles 11. In addition, when the intensity of the magnetic field applied to the particle 11 is increased, the attractive force due to the magnetic field is also increased, so that the interval of the particles 11 becomes narrower, and the wavelength of the light reflected from the particle 11 becomes shorter. That is, according to one embodiment of the present invention, it is possible to control the wavelength of the light reflected from the particle 11 by controlling the intensity of the magnetic field applied to the particle 11. If the wavelength of the light reflected from the particles exceeds the visible light band and corresponds to the ultraviolet light band as the intensity of the magnetic field becomes larger, the particles transmit the visible light without reflecting the light, so that the light transmittance may increase.

According to an embodiment of the present invention, the magnetostrictive material composed of the particles 11 and the solvent 12, as shown in FIG. 2, may be encapsulated by a capsule 13 made of a light- have.

Meanwhile, according to one embodiment of the present invention, the solvent 12 may include a phase change solvent (a phase change agent) or a curable solvent (a curing agent). Herein, the phase change solvent or curable solvent means a solvent which is reversibly or irreversibly phase-changed or cured by adding or subtracting energy such as heat energy or light energy. For example, the phase change solvent or curable solvent may include a phase change material that changes from a solid state to a liquid state as the temperature rises, and a UV curable material which is cured upon irradiation with ultraviolet light.

More specifically, according to one embodiment of the present invention, the phase change solvent of the present invention may include a phase change material accompanied by a physical change process that changes from one state to another depending on the temperature change. For example, the phase change solvent of the present invention may comprise a paraffin hydrocarbon comprising a saturated hydrocarbon group. The phase change solvent of the present invention may contain paraffin stabilized using a material such as ethylene glycol (EG), diethylene glycol (DEG), polyethylene glycol (PEG), polyethylene (PE) In addition, the phase change solvent of the present invention may include a paraffin compound that is hydrophilically modified to be substituted with a carboxyl group (-COOH), an amine group (-NH X ), a sulfone group (-SH), or the like to improve solubility. In addition, the phase change solvent of the present invention may comprise a compound that is processed by a hydrate salt compound. The phase change solvent of the present invention is a high viscosity ethylene compound having a molecular weight of 1000 or more and a substance containing an ethylene group and has a high viscosity as a polymer substance at a low temperature but has a relatively low viscosity at a high temperature (40 캜 or more) And may include materials that increase in solubility for certain solutes as they increase.

In addition, according to one embodiment of the present invention, the curable solvent of the present invention may include a curable material which is accompanied by a chemical change process by irradiating light such as ultraviolet rays, visible rays, or changing the temperature. For example, the curable solvent of the present invention may include an acrylate adhesive, an acrylate monomer, an acrylate monomer radical, or the like containing a carbon double bond. In addition, the curable solvent of the present invention may include an epoxy resin containing an ether bond. In addition, the curable solvent of the present invention may include a polyurethane adhesive containing a urethane bond, a urethane monomer, or the like.

FIG. 3 is a diagram showing a result of photographing a color change of a magnetostrictive material when a magnetic field of various intensities is applied according to an embodiment of the present invention.

Referring to FIG. 3, it can be seen that the light reflected from the particles can be adjusted in all regions of the visible light wavelength range from red to green and purple by adjusting the intensity of the applied magnetic field.

FIG. 4 is a graph illustrating a wavelength of light reflected from a magnetoresistive material according to an intensity of a magnetic field according to an embodiment of the present invention. As the intensity of a magnetic field applied increases, It can be confirmed that the light is moved to the short blue light.

FIG. 5 (a) is a SEM photograph of magnetic particles constituting a magnetostrictive material according to an embodiment of the present invention. In Fig. 5, superparamagnetic Fe 3 O 4 particles between 50 and 300 nm were used as the particles.

FIG. 5 (b) is a view showing that a magnetic variable material according to an embodiment of the present invention is encapsulated into a capsule made of a light-transmitting material, and then a magnetic field is applied to reflect green light. Referring to FIG. 5 (b), it can be seen that the particles in the capsule are regularly arranged at regular intervals according to the magnetic field, and accordingly the light of the green series having a specific wavelength range is mainly reflected.

FIG. 6 is a diagram illustrating a magnet having a butterfly-like pattern formed on an upper portion of a magnetoresistive material according to an embodiment of the present invention and alternately forming magnetic stripes having different intensities at a lower portion of the magnetoresistive material in stripes , And then the color and pattern of the magnetostrictive material are changed as the magnet is rotated.

Meanwhile, according to an embodiment of the present invention, the magnetostrictive material may include particles having magnetophoretic characteristics.

Particularly, when a magnetic field is applied to the magnetoresistive material according to an embodiment of the present invention, the magnetic particles can move in the same or opposite direction to the direction of the magnetic field, A unique color can be displayed.

Meanwhile, according to one embodiment of the present invention, the magnetic variable material may include a material whose light transmittance can be changed as the magnetic field is applied.

7 is a diagram illustrating a configuration in which a light transmittance of a magnetostrictive material is changed according to an embodiment of the present invention.

7, the magnetic variable material-containing portion according to an embodiment of the present invention may include a plurality of magnetic particles 11, a solvent 12, and a capsule 13, A plurality of particles 11 having magnetic properties may be dispersed in the solvent 12. [

7 (a), when a magnetic field is not applied to the magnetically variable material-containing portion, a plurality of magnetic particles 11 may be irregularly dispersed in the capsule 13, In this case, the transmittance of the light incident on the magnetostrictive material is not particularly controlled. That is, the light incident on the magnetostrictive material is scattered or reflected by a plurality of irregularly dispersed particles 11, so that the light transmittance is relatively lowered.

Next, referring to FIG. 7 (b), when a magnetic field is applied to the magnetic variable material, the plurality of particles 11 having magnetism in the capsule 13 can be aligned in a direction parallel to the direction of the magnetic field Whereby the transmittance of the light incident on the self-deformable substance-containing portion can be controlled.

Specifically, when a magnetic field is applied to the magnetostrictive material according to an embodiment of the present invention, the direction from the south pole to the north pole of a plurality of particles 11, which are originally magnetized or magnetized by a magnetic field, Each of the plurality of particles 11 can be rotated or moved so as to be equal to the direction of the magnetic field. Since the N poles and the S poles of the respective particles 11 thus rotated are close to the S poles and the N poles of the surrounding particles 11, a magnetic attracting force or a repulsive force is applied between the plurality of particles 11 So that the plurality of particles 11 can be regularly aligned in a direction parallel to the direction of the magnetic field. That is, the plurality of particles 11 can be regularly aligned in a direction parallel to the direction of the magnetic field applied in the up-and-down direction. In this case, the light incident on the magnetically variable material is scattered by the plurality of particles 11 The degree of reflection is lowered, and accordingly, the light transmittance is relatively increased.

8 is a view showing a basic configuration of a photonic crystal display device according to an embodiment of the present invention. It is to be understood that the photonic crystal display device according to the following embodiments is described as being manufactured in the form of a tag, a card, a film, and a sticker, which are used for preventing forgery and falsification, but it is not necessarily limited to this form. In consideration of this aspect, the thickness of the photonic crystal display device according to the embodiment of the present invention may be 1 탆 to several cm.

8 (a), the photonic crystal display device of the present invention includes a display region 100, and the display region 100 may be interposed between the upper substrate 200 and the lower substrate 300 . The display region 100 is a portion in which a substantially color change is displayed by a change in an external magnetic field, and a plurality of magnetic particles 11, which move in accordance with a change in an external magnetic field, 12 may be encapsulated with a light-transmitting material. Further, the present invention is characterized by further comprising a plurality of light absorbing particles (20) capable of absorbing light incident into the capsule (13). The light absorbing particles 20 can be dispersed in the solvent 12 in the same manner as the magnetic particles 11.

8 (b), the photonic crystal display device of the present invention includes a display region 100, and the display region 100 is interposed between the upper substrate 200 and the lower substrate 300 . The display region 100 is a portion in which a substantially color change is displayed by a change in an external magnetic field, and a plurality of magnetic particles 11, which move in accordance with a change in an external magnetic field, 12 may be filled between the plurality of barrier structures 15. Further, the present invention is characterized in that it further includes a plurality of light absorbing particles (20) capable of absorbing light incident into the solvent (12) filled between the partition walls (15). The light absorbing particles 20 can be dispersed in the solvent 12 in the same manner as the magnetic particles 11.

Light reflected to the upper substrate 200 side by the magnetic particles 11 and light reflected by the upper surface of the lower substrate 300 through the magnetic particles 11 can be mixed in the display area 100 have. If the light beams are superimposed on each other or interfered with each other, there arises a problem that the light to be originally displayed in the display area 100 can not be displayed. Therefore, the light absorbing particles 20 serve to absorb light that is reflected or transmitted by the magnetic particles 11 in the display region 100, and which is incident on the light absorbing particles 20. The light absorbing particles 20 are preferably black in order to easily absorb light, but some other colors may be employed within a range that can absorb light.

As the light absorbing particle 20, for example, a mixed organic pigment composition in which a black pigment such as carbon black, aniline black, iron oxide black, titanium oxide, chromium and the like, or an organic pigment is mixed and blackened can be used. And, as a polymer composition constituted by mixing Black dye, C.I. Food Black 1, C.I. Food Black 2 and the like, C.I. Direct Black 9, C.I. Direct Black 17, C.I. Direct Black 38, C.I. Direct Black 51, C.I. Direct Black 60, C.I. Direct Black 102, C.I. Direct Black 107, C.I. Direct Black 122, C.I. Direct Black 142, C.I. Direct Black 154, C.I. Direct Black 168 and the like, C.I. Acid Black 2, C.I. Acid Black 31, C.I. Acid Black 52, C.I. Acid Black 140, C.I. Acid Black 187 and the like can be used. On the other hand, the composition of the present invention may comprise the light absorbing particles 20 in combination with a polymer material such as polystyrene (PS), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), or polyethylene terephthalate .

As described above, according to the present invention, as the light absorbing particle 20 is included in the display region 100, the remaining light except for the light originally intended to be displayed in the display region 100 by the magnetic particles 11, 20) can absorb light, which is advantageous in that the color, visibility, etc. in the display area 100 can be significantly improved.

The present invention is also advantageous in that the light absorbing particle 20 can absorb light which is directly incident on the display area 100 in the display area 100 rather than including the black sheet 5 Therefore, there is an advantage that it is possible to prevent the interference and distortion of each constituent element inside the photonic crystal display device due to scattering reflection. Fringe reflections should be understood to include Fresnel reflections, which are reflections that occur when light passes through the interface between materials of different refractive indexes.

Further, since the present invention does not require further interposition of the black sheet 5 (see Fig. 1) and the black sheet 5, it is possible to reduce the manufacturing cost and reduce the thickness of the entire photonic crystal display device There is an advantage.

9 to 12 are views showing a photonic crystal display device according to various embodiments of the present invention. Hereinafter, a configuration in which the magnetic particles 11 and the solvent 12 in which the light absorbing particles 20 are dispersed is encapsulated is assumed as the magnetostrictive material 50 as shown in Fig. 8 (a).

Referring to FIG. 9, the magnetic particles 11 and the light absorbing particles 20 may have charges of the same polarity. 9 shows that the magnetic particles 11 and the light absorbing particles 20 have a positive charge, but it is of course possible to have a negative charge.

The magnetic particles 11 and the light absorbing particles 20 can maintain a predetermined gap by the repulsive force as the magnetic particles 11 and the light absorbing particles 20 have charges of the same polarity, , 20 may not coalesce with each other.

The light reflected from the magnetic particles 11 is made visible through the upper substrate 200 and the light transmitted through the magnetic particles 11 is easily absorbed by the light absorbing particles 20, It is preferable that the magnetic particles 11 are arranged on the upper side in the display region 13 (or in the display region 100) and the light absorbing particles 20 are arranged on the lower side.

For this purpose, the specific gravity of the light absorbing particles 20 is preferably larger than that of the magnetic particles 11, and more preferably the specific gravity of the light absorbing particles 20 is larger than the specific gravity of the solvent 12.

Referring to FIG. 10, the magnetic particles 11 may move according to an external magnetic field and change their spacing, but the light absorbing particles 20 are preferably materials that do not react to external magnetic fields . It is also preferable that the magnetic particles 11 have electric charges and the light absorbing particles 20 are composed of neutral particles having no electric charge so that only the magnetic particles 11 react and move according to an external magnetic field application .

Further, the sizes of the magnetic particles 11 and the light absorbing particles 20 may be different from each other so that the magnetic particles 11 and the light absorbing particles 20 can easily move with each other. Particles having a small size between the magnetic particles 11 and the light absorbing particles 20 can be moved.

Referring to FIG. 11, as part of the magnetic particles 11 move to the lower portion of the light absorbing particle 20 having a large size, light is reflected only by the magnetic particles 11 arranged at a predetermined interval from the upper portion, Can be displayed. In the opposite case, since the light absorbing particles 20 are arranged at regular intervals in the solvent 12 and a part of the light absorbing particles 20 is moved to cover some of the magnetic particles 11, The light may be reflected only by the magnetic particles 11 disposed on the upper portion of the particle 20 to display the color.

Referring to FIG. 12, the photonic crystal display device of the present invention may further include a curing agent 30 (see FIG. 13) in the display region 100. Reference numeral 31 in Fig. 12 denotes a curing agent after being cured. The curing agent 30 can be cured by light energy or heat energy such as ultraviolet rays, visible light, or the like.

The specific gravity of the curing agent (30) is preferably larger than the specific gravity of the magnetic particles (11) or the solvent (12). Therefore, the curing agent 30 can be disposed at the bottom in the capsule 13 (or the display area 100), and more preferably, the light absorbing particles 30 having a larger specific gravity than the magnetic particles 11 or the solvent 12 Lt; RTI ID = 0.0 > 20 < / RTI >

The position of the light absorbing particles 20 is fixed in the cured hardening agent 31 located at the bottom and the color is displayed according to the arrangement of the magnetic particles 11 located at the upper portion of the self- .

The magnetic particles 11 and the light absorbing particles 20 may have charges of the same polarity. As a result, the magnetic particles 11 and the light absorbing particles 20 can be maintained at a predetermined distance from each other by the repulsive force, and the two particles 11 and 20 may not be aggregated with each other and not precipitated, 20 can be fixed in the hardened curing agent 31 while being separated from the magnetic particles 11.

Conversely, the magnetic particles 11 and the light absorbing particles 20 may have charges of opposite polarities. Accordingly, even when no magnetic field is applied from the outside, the magnetic particles 11 can be attached to the light absorbing particles 20 fixed in the cured hardener 31 depending on the attraction force. In addition, even when a magnetic field is not externally applied, precipitation of the magnetic particles 11 can be prevented as the magnetic particles 11 adhere to the light absorbing particles 20 depending on the attraction force.

Further, the magnetic particles 11 may be individually controlled according to the force applied to the magnetic particles 11 and the light absorbing particles 20 and the intensity of the magnetic field externally applied depending on the attraction force. For example, when a magnetic field weaker than the magnetic force of the magnetic particles 11 and the light absorbing particles 20 is applied, the magnetic particles 11, which are close to the light absorbing particles 20 fixed in the curing agent 31, The attached state can be maintained according to the attraction with the particles 20 and the color corresponding to the interval of the magnetic particles 11 in this state can be displayed. Conversely, when a magnetic field stronger than that of the magnetic particles 11 and the light absorbing particles 20 is applied, the light absorbing particles 20 are separated from the magnetic particles 11 in the vicinity of the light absorbing particles 20, The color corresponding to the interval of the magnetic particles 11 disposed at the upper portion may be displayed. As described above, the attractive force of the magnetic particles 11 and the light absorbing particles 20 can act similar to the threshold value of magnetism for the magnetic particles 11 to move.

13 is a view showing a process of manufacturing the photonic crystal display device of FIG.

13 (a), a solvent (12) in which magnetic particles (11) and light absorbing particles (20) are dispersed in a display region (or magnetoresistive material (50) 30) are mixed.

13 (b), since the specific gravity of the light absorbing particles 20 or the curing agent 30 is larger than that of the magnetic particles 11 or the solvent 12, the display area 100 (or the magnetic variable The magnetic particles 11 and the solvent 12 are located on the upper side and the light absorbing particles 20 and the curing agent 30 are positioned on the lower side in the material 50. [ In other words, the magnetic particles 11 and the solvent 12, the light absorbing particles 20 and the curing agent 30 can be separated so as not to be mixed.

13 (c), the curing agent 30 can be cured 31 by applying light energy E or heat energy E to the curing agent 30. In this case, Since the light energy E such as ultraviolet light can be applied only to a specific portion, the light energy E is irradiated only to the curing agent 30 located at the lower portion and the curing agent 31 is cured 31, 20 can be fixed. Alternatively, the light absorbing particles 20 can be fixed by applying the heat energy E from the bottom and curing the curing agent 30 located at the bottom.

A magnetic field generating portion 400 such as a magnet capable of applying a magnetic field B at an upper portion of the magnetic field generating portion 400 is provided so that the magnetic particles 11 and the light absorbing particles 20 are not mixed, The light absorbing particles 20 can be fixed by hardening the curing agent 30 located at the lower side while the magnetic particles 11 are moved toward the upper side.

14 is a view showing a process of coating a photonic crystal display device of the present invention on an arbitrary object 500. FIG.

The magnetostrictive material 50 'in FIG. 14 may be formed of magnetic particles 11, a solvent 12, a photonic crystal particle (hereinafter, also referred to as " 20 and the hardener 30 are sealed with a hard shell, as shown in FIG.

The optional object 500 may be a product for preventing forgery of paper, card, sake, cosmetics, etc. to which the magnetorptive material 50 'is attached, By applying a magnetic field, the color change of the magnetorptive substance 50 'can be confirmed and the authenticity can be visually confirmed.

14 (a), a magnetically variable material 50 'in the form of a capsule 13' having a hard shell is first prepared, and a magnetic variable material 50 'is attached to a part of the object 500 can do. At this time, since the specific gravity of the light absorbing particles 20 or the curing agent 30 in the magnetostrictive material 50 'is larger than that of the magnetic particles 11 or the solvent 12, 11 and the solvent 12 may be located on the upper side and the light absorbing particles 20 and the curing agent 30 may be located on the lower side.

Referring to FIG. 14 (b), light energy E or heat energy E may be externally applied to harden the curing agent 30 in the magnetostrictive material 50 '. 13 (c), when a plurality of magnetic particles 11 are moved to the upper side in the solvent 12 by applying the magnetic field B from the outside by using the magnetic field generator 400 The curing agent 30 can be hardened 31 in a more severely separated state where a plurality of magnetic particles 11 and a plurality of light absorbing particles 20 are not mixed.

As described above, the present invention has an advantage that a photonic crystal display device having improved color, visibility, and the like can be provided by coating the magnetic variable material 50 'on the object 500 having a shape other than a plane.

Meanwhile, in the photonic crystal display device of the present invention, it is possible to control the contrast ratio by controlling the arrangement direction of the magnetic particles 11 by adjusting the direction and intensity of the magnetic field applied from the outside.

11, when the magnetic particle 11 and the light absorbing particle 20 are different in particle size, the size of the magnetic particles 11 and the light absorbing particle 20 So that the contrast ratio can be controlled. That is, if a weak magnetic field is applied at the upper part, the whole of the magnetic particles 11 are arranged in a state of being positioned on the upper part of the light absorbing particles 20, so that the magnetic particles 11 are covered with the light absorbing particles 20 It can display the brightest color. However, when a strong magnetic field is applied in the upper portion, the magnetic particles 11 will be arranged slightly lower, and as the portion of the light absorbing particles 20 is interposed in the middle of the magnetic particles 11, ), Thereby displaying a darker color. In addition, the contrast ratio may be controlled by controlling the mixing ratio and specific gravity difference between the magnetic particles 11 and the light absorbing particles 20 in the solvent 12.

15 is a view showing a photonic crystal display device according to another embodiment of the present invention.

The magnetic variable material 52 included in the photonic crystal display device of FIG. 15 moves in accordance with the change of the external magnetic field so that the solvent 12 in which the plurality of magnetic particles 11, A plurality of capsules 13 encapsulated in a material. At least a part of the surface of the capsule 13 may be coated with a light absorbing material 40 capable of absorbing incident light.

The light absorbing material 40 may be made of the same material as the light absorbing particles 20. In addition, the light absorbing material 40 preferably has a black color for easy absorption of light, but some other colors may be employed within a range capable of absorbing light. In order to increase the light absorbing area, the light absorbing material 40 is preferably coated at least on the lower surface of the capsule 13, and more preferably on both sides of the capsule 13.

16 is a view showing a process of manufacturing the photonic crystal display device of FIG.

16 (a), a capsule 13 in which a solvent 12 in which a plurality of magnetic particles 11 are dispersed is encapsulated with a light-transmitting substance is prepared, and the capsule 13 is coated on the display part base material 600 Can be attached. The display portion base material 600 is a portion that can confirm the color change of the magnetically variable material 52 and can serve as an upper base material.

16 (b), a light absorbing material 40 capable of absorbing light incident on at least a part of the remaining surface except for the surface of the capsule 13 which is in contact with the display portion base material 600 Can be coated. The coating may be any known coating method.

17 is a view showing a process of coating a photonic crystal display device according to another embodiment of the present invention on a certain object 500. FIG.

17 (a), a magnetically variable material 10 '(see FIG. 1) in the form of a capsule 13' having a hard shell is first prepared, A light absorbing material 40 capable of absorbing light can be coated.

17 (b), the magnetostrictive material 10 'may be adhered onto a part of the mounter 500 coated with the light absorbing material 40. Next, as shown in FIG.

16 and 17, the present invention can use a simple process of coating the light absorbing material 40 on a part of the surface of the capsule 13 or coating the object on the object 500, (See FIG. 1) and the black sheet 5, which is advantageous in that the manufacturing cost can be reduced and the thickness of the entire photonic crystal display device can be reduced.

Meanwhile, the photonic crystal display device according to the present invention may further include an additional forgery preventing means using at least one of hologram, RFID (Radio Frequency IDentification) and biometric information recognition, thereby further enhancing the effect of forgery prevention on the object .

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

10, 50, 51, 52: magnetic variable material
11: magnetic particles
12: Solvent
13: Capsules
20: light absorbing particle
30: Hardener
40: light absorbing material
100: display area
200: upper substrate
300: Lower substrate
400: magnetic field generator
500: random partner
600: Display unit
B: magnetic field
E: Light energy or heat energy

Claims (26)

A photonic crystal display device comprising a display region,
Wherein the display region includes a plurality of magnetic particles that move in accordance with a change in an external magnetic field and change in spacing therebetween, a plurality of light absorbing particles capable of absorbing incident light, and a plurality of light absorbing particles A solvent in which the particles are dispersed,
The specific gravity of the light absorbing particles is larger than the specific gravity of the magnetic particles,
Wherein the specific gravity of the light absorbing particles is larger than the specific gravity of the solvent. The method according to claim 1,
Wherein the display region includes a capsule encapsulating the solvent with a light-transmitting substance. The method according to claim 1,
Wherein the display region forms a barrier structure, and the solvent is filled between the barrier structures. The method according to claim 1,
Wherein the light absorbing particles do not react with the external magnetic field. The method according to claim 1,
Wherein the plurality of magnetic particles have electric charges, and the plurality of light absorbing particles do not have electric charges. The method according to claim 1,
Wherein the magnetic particles and the light absorbing particles are different in size and the particles having a smaller size between the magnetic particles and the light absorbing particles are larger in size. The method according to claim 1,
Wherein the magnetic particles and the light absorbing particles have charges of the same polarity. The method according to claim 1,
Wherein the plurality of magnetic particles are disposed on the upper portion and the plurality of light absorbing particles are disposed on the lower portion in the display region. The method according to claim 1,
Further comprising a curing agent in the display area,
Wherein the specific gravity of the curing agent is larger than the specific gravity of the magnetic particles or the solvent. 10. The method of claim 9,
Wherein the curing agent is cured by external light energy or heat energy. 11. The method of claim 10,
Wherein the magnetic particles and the light absorbing particles have charges of opposite polarities. A photonic crystal display device comprising a display region,
The display region
A plurality of magnetic particles which move in accordance with a change of an external magnetic field and change intervals between each other;
A plurality of light absorbing particles capable of absorbing incident light;
A solvent in which the plurality of magnetic particles are dispersed; And
And a fixing part surrounding the light absorbing particles and fixing the position of the light absorbing particles,
Wherein the plurality of magnetic particles are located in the solvent on the fixed portion. delete delete delete delete delete delete delete delete (a) mixing a curing agent with a solvent in which a plurality of magnetic particles, which move in accordance with a change in an external magnetic field and change the distance between them, and a plurality of light absorbing particles capable of absorbing incident light are dispersed, Encapsulated capsules wherein the specific gravity of the light absorbing particles or the curing agent is greater than the specific gravity of the magnetic particles or the solvent;
(b) attaching the capsule to a portion of an optional counterpart; And
(c) applying light energy or heat energy from the outside to cure the curing agent,
Wherein the position of the light absorbing particles is fixed by the curing agent by the step (c), and the plurality of magnetic particles are located in the solvent on the curing agent. 22. The method of claim 21,
Between step (b) and step (c)
Applying a magnetic field from the outside to separate the plurality of magnetic particles and the plurality of light absorbing particles from each other so as not to be mixed in the solvent
Further comprising the steps of: forming a photoresist layer on the photoresist layer; Wherein the contrast ratio of the photonic crystal display device is controlled by adjusting at least one of the direction and intensity of the magnetic field applied to the photonic crystal display device of any one of claims 1 to 12 to control the position of the magnetic particles. A method of controlling a photonic crystal display device. And a plurality of capsules encapsulating a solvent in which a plurality of magnetic particles dispersed in the solvent are dispersed in a light transmissive material,
At least a part of the surface of the capsule is coated with a light absorbing material capable of absorbing incident light,
Wherein the light absorbing material is in direct contact with at least a portion of the surface of the capsule. (a) preparing a capsule encapsulating a solvent in which a plurality of magnetic particles dispersed in a solvent is moved in accordance with a change in an external magnetic field and spaced apart from each other;
(b) attaching the capsule to a display portion substrate; And
(c) coating a light absorbing material capable of absorbing light incident on at least a portion of the remaining surface except for the surface of the capsule in contact with the display substrate,
Wherein the light absorbing material is in direct contact with at least a part of the surface of the capsule. (a) preparing a capsule encapsulating a solvent in which a plurality of magnetic particles dispersed in a solvent is moved in accordance with a change in an external magnetic field and spaced apart from each other;
(b) coating a light absorbing material capable of absorbing light incident on at least a portion of any of the mating objects; And
(c) attaching the capsule onto a portion of the mounter coated with the light absorbing material,
Wherein the light absorbing material is in direct contact with at least a part of the surface of the capsule.
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