WO2023219356A1 - 도전볼을 포함하는 연신성 이방 전도성 필름 및 이의 제조방법 - Google Patents
도전볼을 포함하는 연신성 이방 전도성 필름 및 이의 제조방법 Download PDFInfo
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- WO2023219356A1 WO2023219356A1 PCT/KR2023/006203 KR2023006203W WO2023219356A1 WO 2023219356 A1 WO2023219356 A1 WO 2023219356A1 KR 2023006203 W KR2023006203 W KR 2023006203W WO 2023219356 A1 WO2023219356 A1 WO 2023219356A1
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- stretchable
- conductive film
- anisotropic conductive
- manufacturing
- mold
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/0283—Stretchable printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10234—Metallic balls
Definitions
- the present invention relates to a stretchable anisotropic conductive film containing conductive balls and a method of manufacturing the same.
- the adhesive layer of ACF requires high toughness and stable adhesive strength, but the adhesive layer of conventional ACF does not have sufficient toughness or adhesive strength. Additionally, since the particles responsible for conductivity are arranged irregularly within the adhesive layer, it is difficult to form a high-resolution electrical interface between circuits with fine spacing and width, and high pressure, temperature, and time are required to form bonds between devices. Therefore, there is a need to develop ACF that solves these problems and has excellent stretchability and conductivity.
- the present invention seeks to provide a stretchable anisotropic conductive film that is quickly and simply manufactured at low temperature and low pressure, and a method for manufacturing the same.
- the stretchable anisotropic conductive film according to the present invention includes a stretchable substrate; and conductive balls inserted and aligned within the stretchable substrate.
- the stretchable substrate is styrene-ethylene-butylene-styrene (SEBS), styrene-isoprene-styrene (SIS), styrene-butadiene-styrene (SBS), polyurethane (PU)-based rubber, and It may include a thermoplastic rubber grafted with maleic anhydride containing at least one thermoplastic rubber selected from the group consisting of polyolefin (PO)-based rubber.
- SEBS styrene-ethylene-butylene-styrene
- SIS styrene-isoprene-styrene
- SBS styrene-butadiene-styrene
- PU polyurethane
- the conductive ball is made of PS (Polystyrene), PU (Polyurethane) PE (Polyethylene), PP (Polypropylene), PB (Polybutylene), Nylon, and Styrene-divinyl benzene. ), wherein the particles include gold (Au), nickel (Ni), silver (Ag), copper (Cu), aluminum (Al), and palladium (Pd). , may be coated with at least one selected from the group consisting of chromium (Cr), titanium (Ti), tin (Sn), and molybdenum (Mo).
- the diameter of the conductive balls is 1 ⁇ m to 100 ⁇ m
- the spacing between the conductive balls is 1 ⁇ m to 100 ⁇ m
- the pitch is 2 ⁇ m to 200 ⁇ m
- the diameter of the conductive balls and The spacing between the conductive balls may be 2:1 to 1:2.
- the thickness of the stretchable substrate may be 40% to 70% of the diameter of the conductive ball.
- the stretchable substrate has constant physical properties, and the conductive ball is inserted and aligned in the vertical direction on the surface of the stretchable anisotropic conductive film so that both sides of the stretchable anisotropic conductive film are electrically conductive, 30% to 60% of the outer surface may be exposed to the outside of the stretchable substrate.
- a method for manufacturing a stretchable anisotropic conductive film according to the present invention includes manufacturing a mold patterned with a pattern including concave portions; Placing a conductive ball in the mold; coating a stretchable substrate on the mold where the conductive balls are placed; and removing the mold.
- the step of manufacturing the mold may be performed using a photolithography, nanoimprint, soft lithography, block copolymer lithography, or capillary lithography process.
- manufacturing the mold includes preparing a UV-curable polymer; Placing a photomask on the UV curable polymer and patterning it by irradiating UV; And washing the patterned UV-curable polymer to obtain a patterned mold, wherein the UV-curable polymer includes polyethylene glycol diacrylate (PEG-DA), epoxy acrylate, and polyester acrylate ( It may include at least one selected from the group consisting of polyester acrylate, polyurethane acrylate, and silicone acrylate.
- PEG-DA polyethylene glycol diacrylate
- epoxy acrylate epoxy acrylate
- polyester acrylate It may include at least one selected from the group consisting of polyester acrylate, polyurethane acrylate, and silicone acrylate.
- the UV curable polymer in the step of patterning by irradiating UV, is patterned into a cured hard gel and an uncured soft gel, the soft gel forms the concave portion, and the depth of the concave portion is may be 10% to 30% of the diameter of the conductive ball.
- the step of patterning by irradiating UV is irradiating UV for 1 to 10 seconds, the distance between the UV curable polymer and the UV light source is 8 cm to 16 cm, and the UV intensity is 2. It may be mW/cm 2 to 20 mW/cm 2 .
- the step of arranging the conductive ball is rubbing the conductive ball on the mold, the conductive ball is adhered to the concave portion, and the adhesive force of the concave portion is 1 nN to 90 nN. You can.
- arranging the challenge ball may further include the step of blowing air afterwards.
- the step of removing the mold is to peel off the stretchable substrate, and the stretchable substrate may be aligned by inserting the conductive ball.
- the present invention can provide a stretchable anisotropic conductive film manufactured quickly and simply at low temperature and low pressure, and a method for manufacturing the same.
- the method for manufacturing a stretchable anisotropic conductive film according to the present invention can provide a quick and simple method for manufacturing a stretchable anisotropic conductive film that does not require a heat compression process such as high temperature and pressure.
- particles can be arranged in various shapes by setting the size and spacing of the desired pattern, and conductive balls of various sizes can be used to manufacture stretchable anisotropic conductive films without designing a new mold.
- FIG. 1 is a schematic diagram of a stretchable anisotropic conductive film according to an embodiment of the present invention.
- Figure 2 is a schematic diagram of a method of manufacturing a stretchable anisotropic conductive film according to an embodiment of the present invention.
- Figure 3 is a schematic diagram of the step of manufacturing a mold in the method of manufacturing a stretchable anisotropic conductive film according to an embodiment of the present invention.
- Figure 4 is a schematic diagram of the step of arranging a conductive ball and the step of coating a stretchable substrate in the method of manufacturing a stretchable anisotropic conductive film according to an embodiment of the present invention.
- Figure 5 is an SEM image of a patterned mold according to an embodiment of the present invention.
- Figure 6 is (a) an OM image of a mold in which conductive balls are placed and (b) an SEM image of a cross section of a stretchable anisotropic conductive film according to an embodiment of the present invention.
- Figure 7 is a graph showing the IV measurement results of an electronic device to which a stretchable anisotropic conductive film according to an embodiment of the present invention is applied.
- the stretchable anisotropic conductive film according to the present invention includes a stretchable substrate; and conductive balls inserted and aligned within the stretchable substrate.
- the stretchable anisotropic conductive film (S-ACF) according to the present invention has excellent stretchability, that is, elasticity, and can change with the deformation of the substrate, making it suitable for flexible electronic devices. It has excellent adhesion and can be applied to electronic devices. It can firmly join the interfaces of different members, maintain uniform and constant conductivity by including regularly arranged conductive balls, and can be used in various fields because the area where the conductive balls are arranged can be freely controlled. .
- FIG. 1 is a schematic diagram of a stretchable anisotropic conductive film according to an embodiment of the present invention.
- the conductive ball 10 can be inserted and aligned within the stretchable substrate 20, and current flows in the vertical direction through the portion where the conductive ball 10 is exposed, and the non-conductive stretchable substrate 20 (20), it is possible to provide a stretchable anisotropic conductive film 100 with a vertical conduction path through which current cannot flow in the horizontal direction.
- the stretchable substrate is styrene-ethylene-butylene-styrene (SEBS), styrene-isoprene-styrene (SIS), styrene-butadiene-styrene (SBS), polyurethane (PU)-based rubber, and It may include a thermoplastic rubber grafted with maleic anhydride containing at least one thermoplastic rubber selected from the group consisting of polyolefin (PO)-based rubber.
- SEBS styrene-ethylene-butylene-styrene
- SIS styrene-isoprene-styrene
- SBS styrene-butadiene-styrene
- PU polyurethane
- the stretchable substrate has excellent elasticity and high elongation, and has low conductivity, making it possible to form a stretchable anisotropic conductive film so that electricity can flow only at desired locations.
- Thermoplastic rubber grafted with maleic anhydride has excellent flexibility and elasticity and may be suitable as a material for the stretchable substrate.
- the thermoplastic rubber grafted with maleic anhydride can form a chemical bond with other members, such as a target substrate, to form stable adhesion even at low temperature and pressure.
- the thermoplastic rubber may preferably be styrene-ethylene-butylene-styrene, but is not limited to those listed above.
- the maleic anhydride may be 1% by weight or more of the thermoplastic rubber. When maleic anhydride is included in an amount within the above range, it may have the effect of providing a sufficient number of bond formation sites relative to the adhesive area.
- the conductive ball is made of PS (Polystyrene), PU (Polyurethane) PE (Polyethylene), PP (Polypropylene), PB (Polybutylene), Nylon, and Styrene-divinyl benzene. ), wherein the particles include gold (Au), nickel (Ni), silver (Ag), copper (Cu), aluminum (Al), and palladium (Pd). , may be coated with at least one selected from the group consisting of chromium (Cr), titanium (Ti), tin (Sn), and molybdenum (Mo).
- the conductive ball has at least a conductive surface, so that it can form a stretchable anisotropic conductive film with region-selective conductivity.
- the conductive balls are inserted into and aligned with the stretchable substrate. That is, the conductive balls may be embedded in the stretchable substrate and may be arranged in a regular manner.
- the “alignment” may mean that a plurality of challenge balls are arranged at equal intervals or at intervals with a certain regularity. That is, when one conductive ball is inserted into a stretchable substrate, other conductive balls can be positioned at a predetermined interval, and another conductive ball can also be positioned at a predetermined interval from the other conductive ball. there is.
- the conductive balls may be arranged in any one of grid, honeycomb, linear, and square arrangements, but are not limited thereto and may be arranged in various shapes as needed.
- the conductive ball may be entirely a metal particle or a particle whose surface is coated with a metal material, and may preferably have a spherical shape.
- the conductive ball includes a core containing an insulating polymer; and a shell containing a metal; it may be a core-shell structure containing a.
- conductive balls of uniform size can be used in the stretchable anisotropic conductive film, and the weight of the stretchable anisotropic conductive film can be reduced, thereby reducing the weight of the device and reducing production costs. It might work.
- the diameter of the conductive balls is 1 ⁇ m to 100 ⁇ m
- the spacing between the conductive balls is 1 ⁇ m to 100 ⁇ m
- the pitch is 2 ⁇ m to 200 ⁇ m
- the diameter of the conductive balls and The spacing between the conductive balls may be 2:1 to 1:2.
- the diameter of the conductive ball is preferably between 1 ⁇ m and 80 ⁇ m; 1 ⁇ m to 60 ⁇ m; 1 ⁇ m to 40 ⁇ m; 1 ⁇ m to 20 ⁇ m; 2 ⁇ m to 80 ⁇ m; 2 ⁇ m to 60 ⁇ m; 2 ⁇ m to 40 ⁇ m; 2 ⁇ m to 20 ⁇ m; 5 ⁇ m to 80 ⁇ m; 5 ⁇ m to 60 ⁇ m; 5 ⁇ m to 40 ⁇ m; Or it may be 5 ⁇ m to 20 ⁇ m.
- the diameter of the conductive ball is less than 1 ⁇ m, when rubbing the conductive ball to arrange it in the stretchable substrate, the conductive ball is not rolled but is swept as it is, resulting in particle assembly. There may be a problem that it is difficult to form, and if it exceeds 100 ⁇ m, there may be a problem with resolution.
- Each individual conductive ball may have the same diameter.
- conductive balls having the same diameter there is no step in the height direction of the stretchable anisotropic conductive film, so a separate bumper layer for anisotropic conduction may not be necessary.
- the spacing between challenge balls may represent the closest distance between the end of one challenge ball and the end of another challenge ball.
- the spacing between the conductive balls is preferably 1 ⁇ m to 80 ⁇ m; 1 ⁇ m to 60 ⁇ m; 1 ⁇ m to 40 ⁇ m; 1 ⁇ m to 20 ⁇ m; 2 ⁇ m to 80 ⁇ m; 2 ⁇ m to 60 ⁇ m; 2 ⁇ m to 40 ⁇ m; 2 ⁇ m to 20 ⁇ m; 5 ⁇ m to 80 ⁇ m; 5 ⁇ m to 60 ⁇ m; 5 ⁇ m to 40 ⁇ m; Or it may be 5 ⁇ m to 20 ⁇ m.
- the pitch of the challenge ball may represent the distance from the center of one challenge ball to the center of another challenge ball.
- the pitch of the conductive ball is preferably between 2 ⁇ m and 160 ⁇ m; 2 ⁇ m to 120 ⁇ m; 2 ⁇ m to 80 ⁇ m; 2 ⁇ m to 40 ⁇ m; 4 ⁇ m to 160 ⁇ m; 4 ⁇ m to 120 ⁇ m; 4 ⁇ m to 80 ⁇ m; 4 ⁇ m to 40 ⁇ m; 10 ⁇ m to 160 ⁇ m; 10 ⁇ m to 120 ⁇ m; 10 ⁇ m to 80 ⁇ m; Or it may be 10 ⁇ m to 40 ⁇ m, and can provide a fine pitch stretchable anisotropic conductive film.
- the spacing and pitch of the conductive balls are less than the above range, there may be a problem in which the arrangement is not properly formed. As the spacing between conductive balls narrows, contact phenomena such as electrostatic attraction between conductive balls may occur during the rubbing process, which may cause cross-talk, and the conductive balls may be arranged so densely that it may be difficult to arrange them in the desired pattern. .
- the conductive balls are aligned with the spacing and pitch within the above range, due to the regular arrangement of the particle diameter units, performance such as conductivity and resolution can be constant within the entire area of the stretchable anisotropic conductive film, and thus electrode connection Accurate design of (interconnection) may be possible.
- the spacing and pitch of the conductive balls can be adjusted depending on the arrangement type, the diameter of the conductive balls, and the field of use of the stretchable anisotropic conductive film.
- the diameter of the conductive balls and the spacing between the conductive balls are preferably 2:1 to 2:3; 2:1 to 1:1; 2:1 to 3:2; 3:2 to 1:1; 3:2 to 2:3; 3:2 to 1:2; 1:1 to 2:3; 1:1 to 1:2; Or it may be 2:3 to 1:2.
- the thickness of the stretchable substrate may be 40% to 70% of the diameter of the conductive ball.
- the thickness of the stretchable substrate is less than 40% of the diameter of the conductive ball, there may be a problem in which the conductive balls are not properly aligned, or the thickness of the stretchable substrate is too thin to properly adhere to the surface of the electrode substrate. If it is more than 70%, the stretchable substrate covers the surface of the conductive ball and the conductive ball is not exposed, which may cause problems with electricity supply.
- the thickness ratio of the stretchable substrate is within the above range, a portion of the conductive ball is exposed from the surface of the stretchable substrate, and when the stretchable anisotropic conductive film is pressed with another member such as a target substrate, it can have high conductivity. .
- the thickness of the stretchable substrate may be 1 ⁇ m to 50 ⁇ m, but is not limited to this range.
- the stretchable substrate has constant physical properties, and the conductive ball is inserted and aligned in the vertical direction on the surface of the stretchable anisotropic conductive film so that both sides of the stretchable anisotropic conductive film are electrically conductive, 30% to 60% of the outer surface may be exposed to the outside of the stretchable substrate.
- conductive balls are exposed to the outside through hot pressing and form conductivity by contacting other members such as a target substrate.
- the stretchable substrate of the stretchable anisotropic conductive film that has gone through a heat compression process is in close contact with the conductive ball, causing the conductive ball to be exposed to the outside and be pushed away. This may cause differences in physical properties depending on the location and may not be uniform overall. There may be deformation in the stretchable substrate before heat compression.
- physical properties may mean elongation, toughness, etc.
- the stretchable anisotropic conductive film according to the present invention is formed by coating a stretchable base material on a conductive ball without a heat compression process, deformation of the stretchable base material does not occur, and thus the stretchable anisotropic conductive film is stretched regardless of the position of the conductive ball inserted into the stretchable base material.
- the physical properties of all parts of the new substrate may be constant.
- the stretchable anisotropic conductive film can form a vertical conductive path that conducts electricity through conductive balls inserted in the vertical direction.
- the conductive balls are exposed to the outside of the upper and lower surfaces of the stretchable substrate.
- the current flowing from the member in contact with one side of the stretchable anisotropic conductive film can be allowed to flow to the other member in contact with the other side of the stretchable anisotropic conductive film.
- the exposed external surface may include both the upper and lower surfaces where the conductive ball is exposed.
- the conductive ball has 30% to 50% of the outer surface; 30% to 40%; 40% to 60%; 40% to 50%; Or 50% to 60% may be exposed to the outside of the upper and lower surfaces of the stretchable substrate.
- the stretchable anisotropic conductive film according to the present invention may have a stress of 10 MPa or less, 8 MPa or less, or 5 MPa or less when stretched at an elongation rate of 100%. If the stress is within the above range when stretched at an elongation rate of 100%, the stretchable anisotropic conductive film may have excellent elasticity, and conductivity may not deteriorate even in the presence of physical stimulation, resulting in excellent conduction stability. In addition, the stretchable anisotropic conductive film according to the present invention may have a stress of 10 MPa or less when stretched at an elongation rate of 200%.
- a method for manufacturing a stretchable anisotropic conductive film according to the present invention includes manufacturing a mold patterned with a pattern including concave portions; Placing a conductive ball in the mold; coating a stretchable substrate on the mold where the conductive balls are placed; and removing the mold.
- the method for manufacturing a stretchable anisotropic conductive film according to the present invention can quickly and simply provide a fine-pitch stretchable anisotropic conductive film with excellent elasticity and conductivity at low temperature and low pressure.
- Figure 2 is a schematic diagram of a method of manufacturing a stretchable anisotropic conductive film according to an embodiment of the present invention.
- a conductive ball 10 may be placed on the patterned mold 30.
- the conductive ball 10 inserted into the stretchable substrate 20 can be obtained by coating the stretchable substrate 20 on the patterned mold 30 in which the conductive ball 10 is disposed, and remove it ( Peel off)
- the patterned mold 30 can be removed and a stretchable anisotropic conductive film can be manufactured.
- the method of manufacturing a stretchable anisotropic conductive film according to the present invention involves placing conductive balls on a mold and then coating a stretchable substrate. Through this, a fine pitch stretchable anisotropic conductive film can be easily manufactured under low temperature and low pressure conditions.
- the characteristics of the conductive ball and the stretchable substrate are the same as those described above, so their description is omitted below.
- the step of manufacturing the mold may be performed using a photolithography, nanoimprint, soft lithography, block copolymer lithography, or capillary lithography process.
- the process in which the mold manufacturing step is performed is not particularly limited, but may preferably be performed through a photolithography process.
- manufacturing the mold includes preparing a UV-curable polymer; Placing a photomask on the UV curable polymer and patterning it by irradiating UV; And washing the patterned UV-curable polymer to obtain a patterned mold, wherein the UV-curable polymer includes polyethylene glycol diacrylate (PEG-DA), epoxy acrylate, and polyester acrylate ( It may include at least one selected from the group consisting of polyester acrylate, polyurethane acrylate, and silicone acrylate.
- PEG-DA polyethylene glycol diacrylate
- epoxy acrylate epoxy acrylate
- polyester acrylate It may include at least one selected from the group consisting of polyester acrylate, polyurethane acrylate, and silicone acrylate.
- Figure 3 is a schematic diagram of the step of manufacturing a mold in the method of manufacturing a stretchable anisotropic conductive film according to an embodiment of the present invention.
- a mold 30 patterned in a desired pattern can be obtained by coating and preparing a UV curable polymer 40, placing a photomask 50 on it, and then irradiating UV.
- the step of preparing the UV curable polymer may be coating the UV curable polymer on the wafer.
- the wafer is not particularly limited and may be selected from silicon wafers, glass, and metal substrates. Preferably, it may be a silicon wafer.
- the wafer may be subjected to chemical surface treatment to form a stable bond with a UV-curable polymer.
- the surface treatment may be oxygen plasma treatment at 100 W to 300 W for 1 minute to 5 minutes and then treatment with a silane compound solution.
- the silane compound may preferably be TMSPMA (3-(Trimethoxysilyl)propyl methacrylate).
- the silane compound solution treatment may be performed at a temperature of 50°C to 80°C for 30 minutes to 2 hours.
- the step of preparing a UV-curable polymer may be coating a solution of a mixture of a UV-curable polymer and a photocuring agent on the surface-treated wafer.
- the coating may include at least one selected from the group consisting of spray coating, spin coating, dip coating, screen coating, knife coating, kiss coating, gravure coating, bar coating, screen printing, and spray-mist spray coating. , preferably spin coating.
- the photomask may have circular patterns arranged in various shapes.
- the pattern may be arranged in any one of grid, honeycomb, linear and square arrangements, but is not limited thereto and may be arranged in various forms as needed.
- the photomask can be patterned by arranging a pattern of a desired shape where the conductive balls are ultimately arranged.
- the UV curable polymer is not limited to those listed above, and may preferably have low adhesion to the stretchable substrate. UV-curable polymers cure in areas exposed to UV and do not cure in areas not exposed to UV, and can be patterned by UV irradiation.
- the UV curable polymer in the step of patterning by irradiating UV, is patterned into a cured hard gel and an uncured soft gel, the soft gel forms the concave portion, and the depth of the concave portion is may be 10% to 30% of the diameter of the conductive ball.
- the UV curable polymer may be cured in a portion exposed to UV to form a hard gel, while the portion not exposed to UV is not cured to form a soft soft gel. It can be hardened into a desired pattern using a photomask, and the pattern shape may be concave. This may be caused by a difference in refractive index between the cured UV-curable polymer and the uncured UV-curable polymer.
- the concave pattern may have adhesive force due to viscoelastic polymer at the interface of the UV-curable polymer.
- the depth of the concave portion is less than 10% of the diameter of the conductive ball, there may be a problem in which the conductive balls are not properly aligned. If the depth is more than 30%, the stretchable substrate covers the top of the conductive ball when forming the film, causing the top of the conductive ball to be damaged. There may be a problem that it does not open or the thickness of the film is not appropriate.
- the depth ratio of the concave portion is formed within the above range, the surface of the conductive ball is appropriately exposed, and a stretchable anisotropic conductive film with excellent stretchability and conductivity can be manufactured.
- the step of patterning by irradiating UV is irradiating UV for 1 to 10 seconds, the distance between the UV curable polymer and the UV light source is 8 cm to 16 cm, and the UV intensity is 2. It may be mW/cm 2 to 20 mW/cm 2 .
- the UV irradiation time is preferably 1 second to 8 seconds; 1 second to 6 seconds; 1 second to 4 seconds; 1 to 3 seconds; 3 to 10 seconds; 3 to 8 seconds; 3 to 6 seconds; 3 to 5 seconds; 4 to 10 seconds; 4 to 8 seconds; Or it may be 4 seconds to 6 seconds.
- the distance between the UV curable polymer and the UV light source is preferably between 8 cm and 14 cm; 8 cm to 12 cm; 8 cm to 10 cm; 10 cm to 16 cm; 10 cm to 14 cm; 10 cm to 12 cm; 12 cm to 16 cm; Or it may be 12 cm to 14 cm.
- the UV intensity is preferably between 2 mW/cm 2 and 18 mW/cm 2 ; 2 mW/cm 2 to 14 mW/cm 2 ; 2 mW/cm 2 to 10 mW/cm 2 ; 2 mW/cm 2 to 6 mW/cm 2 ; 4 mW/cm 2 to 20 mW/cm 2 ; 4 mW/cm 2 to 18 mW/cm 2 ; 6 mW/cm 2 to 14 mW/cm 2 ; 6 mW/cm 2 to 10 mW/cm 2 ; 8 mW/cm 2 to 20 mW/cm 2 ; 8 mW/cm 2 to 18 mW/cm 2 ; 8 mW/cm 2 to 14 mW/cm 2 ; The degree may be 8 mW/cm 2 to 10 mW/cm 2 ;
- the photoreaction of the UV-curable polymer can be performed smoothly, the conductive ball adheres smoothly, and a concave deep enough to expose the surface of the conductive ball to the stretchable substrate is clearly visible. can be formed.
- the step of arranging the conductive ball is rubbing the conductive ball on the mold, the conductive ball is adhered to the concave portion, and the adhesive force of the concave portion is 1 nN to 90 nN. You can.
- Figure 4 is a schematic diagram of the step of arranging a conductive ball and the step of coating a stretchable substrate in the method of manufacturing a stretchable anisotropic conductive film according to an embodiment of the present invention.
- rubbing may be performed using an elastic member 60 to place the conductive ball 10 on the patterned mold 30, and the conductive ball 10 may be placed on the mold 30 where the conductive ball 10 is placed.
- a stretchable anisotropic conductive film can be formed by coating the stretchable substrate 20.
- the concave pattern formed by the uncured UV-curable polymer may have adhesive force due to a viscoelastic polymer at the interface of the UV-curable polymer.
- the rubbing refers to arranging conductive balls in concave portions with adhesive force, and may involve arranging conductive balls by placing them in an elastic member stamp and rubbing them against the patterned mold.
- the elastic member may serve to hold the conductive ball, and more specifically, may directly contact the conductive ball and perform the role of rubbing on the concave pattern formed in the mold.
- the elastic members include polydimethylsiloxane (PDMS), polyurethane acrylate (PUA), polymethyl methacrylate (PMMA), polybutadiene (PB), polyurethane (PU), styrenebutadiene rubber (SBR), polyvinylidene fluoride (PVDF), and poly(vinylidene fluoride (PVDF-TrFE)).
- the elastic member may place the conductive ball in a concave portion of the patterned mold by reciprocating a predetermined distance in one direction of the patterned mold once or multiple times.
- the conductive ball may be adhered by adhesive force formed in the concave portion.
- the adhesive force is preferably between 1 nN and 70 nN; 1 nN to 50 nN; 1 nN to 30 nN; 1 nN to 10 nN; 10 nN to 90 nN; 10 nN to 70 nN; 10 nN to 50 nN; 10 nN to 30 nN; 30 nN to 90 nN; 30 nN to 70 nN; 30 nN to 50 nN; 50 nN to 90 nN; Or it may be 50 nN to 70 nN.
- the adhesive force is less than 1 nN, the adhesive force is weak and the conductive balls cannot adhere and easily fly away, or the conductive balls are not properly aligned, which may make it difficult to produce a highly aligned anisotropic conductive film. If it is more than 90 nN, the stretchable substrate must be removed. When releasing, there may be a problem that the conductive balls are inserted into the stretchable substrate and remain in the mold instead of being transferred to the film.
- arranging the challenge ball may further include the step of blowing air afterwards.
- the mold in which the conductive balls are disposed may have conductive balls in hard gels in addition to soft gels with concave patterns. To remove conductive balls not placed on the pattern, conductive balls not placed on the pattern can be blown by air blowing. The conductive ball formed in the concave portion may not fly away even when air blowing is performed due to adhesive force.
- the step of coating the stretchable substrate on the mold where the conductive balls are placed may involve exposing the conductive balls and coating the stretchable substrate.
- the coating may be adjusted so that the coated stretchable substrate does not completely cover the conductive ball.
- the coating may include at least one selected from the group consisting of spray coating, spin coating, dip coating, screen coating, knife coating, kiss coating, gravure coating, bar coating, screen printing, and spray-mist spray coating. , preferably spin coating.
- the stretchable substrate may be coated in a solution diluted in a solvent. If the concentration of the solution is too thick or the coating speed is too slow, it may be difficult to form conductivity with the target member because the conductive ball is completely covered and the surface of the conductive ball is not exposed. If the concentration is too light or the coating speed is too fast, it may be difficult to form conductivity with the target member. Since the stretchable substrate coating may become too thin and the target member and the adhesive portion may not properly contact each other, coating must be performed taking concentration and speed into consideration.
- the solvent may be removed by heat treatment at a temperature of 50°C to 80°C for 1 to 10 minutes.
- the step of removing the mold is to peel off the stretchable substrate, and the stretchable substrate may be aligned by inserting the conductive ball.
- the stretchable substrate is coated with the conductive balls inserted into the stretchable substrate in an aligned form, and the stretchable anisotropic conductive film can be manufactured by peeling off the mold.
- a fine-pitch stretchable anisotropic conductive film of 20 ⁇ m or less can be manufactured through a low-temperature, low-pressure process by manufacturing a patterned mold, placing a conductive ball on it, coating the stretchable substrate, and then removing it.
- the silicon wafer was treated with TMSPMA (3-(Trimethoxysilyl)propyl methacrylate).
- TMSPMA Trimethoxysilylpropyl methacrylate
- the silicon wafer was subjected to oxygen plasma treatment (200 W, 2 min) to form hydroxyl groups on the surface, then immersed in TMSPMA solution diluted in ethanol (3 wt% in EtOH) at 60°C for 1 hour, taken out, and ethanol-treated. It was rinsed and dried with an air blow.
- the photomask was removed from the PEG-DA layer, and the uncured liquid PEG-DA in the area where the chrome pattern was was was washed with toluene while spin-coating (30 seconds, 2000 rpm) to remove it. Then, heat treatment (60°C, 5 minutes) was performed to remove the remaining toluene, and in the case of the formed concave pattern, there was adhesion due to the viscoelastic polymer at the uncured PEG-DA interface.
- Figure 5 is an SEM image of a patterned mold according to an embodiment of the present invention. Referring to FIG. 5, a cross section of the patterned mold can be seen in which the uncured portion after UV irradiation has a concave shape, and the conductive ball can adhere to the concave pattern.
- Conductive balls (20, 10, 5, 2.5 ⁇ m) that match the size of the formed pattern are buried in the PDMS stamp and rubbed on the PEG-DA layer with the concave pattern to arrange the conductive balls. Then, the conductive balls that are not in the pattern are blown away with air. got rid of it Thanks to the adhesiveness of the concave pattern, the challenge balls in the pattern do not fly away even in strong winds. Then, in order not to cover the entire conductive ball, a SEBS-g-MA solution diluted in toluene of an appropriate concentration was spin-coated to form a film only in the center of the conductive ball. The remaining toluene was removed by heat treatment (60°C, 5 minutes).
- Figure 6 is (a) an OM image of a mold in which conductive balls are placed and (b) an SEM image of a cross section of a stretchable anisotropic conductive film according to an embodiment of the present invention. Referring to (a) of Figure 6, it can be seen that the conductive ball is well adhered to the mold in a certain pattern, and referring to (b) of Figure 6, the conductive ball is inserted into the stretchable substrate. It can be confirmed that the conductive film was manufactured.
- the stretchable anisotropic conductive film of the example was transferred between two electrode circuits and heat-compressed (0.1 MPa) at 80° C. for 10 minutes to be used as an electrical interface.
- the electrode circuit was formed with five lines numbered 1 to 5. IV measurements were conducted to test performance.
- an electrode circuit was formed by Au sputtering (20 mA, 300s DC magnetron sputter) on a PET substrate using a metal mask. After heat-compressing the stretchable anisotropic conductive film of the example between two electrode circuits, lightly apply liquid metal to the end of the lower electrode, lightly apply liquid metal to the end of the upper electrode, attach conductive tape, and then lightly apply liquid metal to the end again. gave. Then, an IV tip was contacted to each end. For IV measurement conditions, 1 mA was set as compliance and the current value was measured by applying from 0 to 2 V.
- Figure 7 is a graph showing the IV measurement results of an electronic device to which a stretchable anisotropic conductive film according to an embodiment of the present invention is applied. Referring to FIG. 7, in the case of the same lines such as 1-1, 2-2, 3-3, 4-4, and 5-5, ohmic curves were shown, whereas when measured by contacting different lines, , it was confirmed that no current was flowing.
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Abstract
Description
Claims (14)
- 연신성 기재; 및상기 연신성 기재 내 삽입되어 정렬된 도전볼;을 포함하는,연신성 이방 전도성 필름.
- 제1항에 있어서,상기 연신성 기재는, 스티렌-에틸렌-부틸렌-스티렌(SEBS), 스티렌-이소프렌-스티렌(SIS), 스티렌-부타디엔-스티렌(SBS), 폴리우레탄(PU) 계 고무 및 폴리올레핀(PO) 계 고무로 이루어진 군으로부터 선택되는 적어도 어느 하나의 열가소성 고무를 포함하는 무수말레인산이 그래프트된 열가소성 고무를 포함하는 것인,연신성 이방 전도성 필름.
- 제1항에 있어서,상기 도전볼은, PS(Polystyrene), PU(Polyurethane) PE(Polyethylene), PP(Polypropylene), PB(Polybutylene), 나일론(Nylon) 및 스티렌-디비닐 벤젠(Styrene-divinyl benzene)으로 이루어진 군으로부터 선택되는 적어도 어느 하나의 입자를 포함하는 것이고,상기 입자는, 금(Au), 니켈(Ni), 은(Ag), 구리(Cu), 알루미늄(Al), 팔라듐(Pd), 크로뮴(Cr), 티타늄(Ti), 주석(Sn) 및 몰리브덴(Mo)으로 이루어진 군으로부터 선택되는 적어도 어느 하나로 코팅된 것인,연신성 이방 전도성 필름.
- 제1항에 있어서,상기 도전볼의 직경은 1 ㎛ 내지 100 ㎛인 것이고,상기 도전볼 간 간격은 1 ㎛ 내지 100 ㎛인 것이고,피치는 2 ㎛ 내지 200 ㎛인 것이고,상기 도전볼의 직경 및 상기 도전볼 간 간격은 2 : 1 내지 1 : 2인 것인,연신성 이방 전도성 필름.
- 제1항에 있어서,상기 연신성 기재의 두께는 상기 도전볼의 직경의 40 % 내지 70 %인 것인,연신성 이방 전도성 필름.
- 제1항에 있어서,상기 연신성 기재는, 물성이 전체가 일정한 것이고,상기 도전볼은, 상기 연신성 이방 전도성 필름 양면이 통전되도록 상기 연신성 이방 전도성 필름면에 수직방향으로 삽입 정렬된 것이고,외부 표면의 30 % 내지 60 %가 상기 연신성 기재의 외부로 노출되어 있는 것인,연신성 이방 전도성 필름.
- 오목부를 포함하는 패턴으로 패터닝된 몰드를 제조하는 단계;상기 몰드에 도전볼을 배치하는 단계;상기 도전볼이 배치된 몰드에 연신성 기재를 코팅하는 단계; 및상기 몰드를 제거하는 단계;를 포함하는,연신성 이방 전도성 필름의 제조방법.
- 제7항에 있어서,상기 몰드를 제조하는 단계는, 포토리소그래피, 나노임프린트, 소프트리소그래피, 블록공중합체 리소그래피 또는 캐필러리 리소그래피 공정으로 수행되는 것인,연신성 이방 전도성 필름의 제조방법.
- 제7항에 있어서,상기 몰드를 제조하는 단계는,UV 경화성 폴리머를 준비하는 단계;상기 UV 경화성 폴리머 상에 포토마스크를 위치시키고, UV를 조사하여 패터닝하는 단계; 및상기 패터닝된 UV 경화성 폴리머를 워싱하여 패터닝된 몰드를 획득하는 단계;를 포함하고,상기 UV 경화성 폴리머는, PEG-DA(Polyethylene glycol diacrylate), 에폭시 아크릴레이트(Epoxy acrylate), 폴리에스터 아크릴레이트(Polyester acrylate), 폴리우레탄 아크릴레이트(Polyurethane arylate) 및 실리콘 아크릴레이트(Silicone acrylate)로 이루어진 군으로부터 선택되는 적어도 어느 하나를 포함하는 것인,연신성 이방전도성 필름의 제조방법.
- 제9항에 있어서,상기 UV를 조사하여 패터닝하는 단계는, 상기 UV 경화성 폴리머가 경화된 하드 겔 및 경화되지 않은 소프트 겔로 패터닝 되는 것이고,상기 소프트 겔은 상기 오목부를 형성하는 것이고,상기 오목부의 깊이는 상기 도전볼의 직경의 10 % 내지 30 %인 것인,연신성 이방전도성 필름의 제조방법.
- 제9항에 있어서,상기 UV를 조사하여 패터닝하는 단계는, UV를 1 초 내지 10 초 동안 조사하는 것이고,상기 UV 경화성 폴리머와 UV 광원 사이의 거리는 8 cm 내지 16 cm인 것이고,UV 세기는 2 mW/cm2 내지 20 mW/cm2인 것인,연신성 이방전도성 필름의 제조방법.
- 제7항에 있어서,상기 도전볼을 배치하는 단계는, 상기 몰드에 상기 도전볼을 러빙하는 것이고,상기 오목부에 상기 도전볼이 점착되는 것이고,상기 오목부의 점착력은 1 nN 내지 90 nN인 것인,연신성 이방전도성 필름의 제조방법.
- 제7항에 있어서,상기 도전볼을 배치하는 단계; 이후에 에어 블로잉하는 단계;를 더 포함하는 것인,연신성 이방전도성 필름의 제조방법.
- 제7항에 있어서,상기 몰드를 제거하는 단계는, 상기 연신성 기재를 떼어내는(Peel off) 것이고,상기 연신성 기재는 상기 도전볼이 삽입되어 정렬된 것인,연신성 이방전도성 필름의 제조방법.
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