KR20200124500A - Stretchable substrate and electronic device comprising same - Google Patents

Abstract

The present specification relates to a stretchable substrate and an electronic device including the same. The stretchable substrate comprises: a stretchable polymer film having a concave part on at least one surface thereof; a non-stretchable pattern provided in the concave part of the stretchable polymer film; and two or more spaced adhesive layer patterns provided on a surface opposite to a surface being in contact with the stretchable polymer film of each non-stretchable pattern.

Description

Stretchable substrate and electronic device including the same {STRETCHABLE SUBSTRATE AND ELECTRONIC DEVICE COMPRISING SAME}

The present specification describes a flexible substrate and an electronic device including the same.

Conventionally, display devices include an unbreakable display, a curved display, a bent display, a foldable display, and a rollable display. Has been developed.

The current commercialization stage is about the mobile field in the form of a curved display, and the mobile field using a foldable display is expected to appear in earnest. In addition, the development speed of the electronic field using pOLED is also remarkable.

In particular, in recent years, stretchable displays that exceed the characteristics of a display that can be wound according to a change in display paradigm have been developed, and a stretchable display needs a characteristic that easily stretches and contracts regardless of the direction. It is essential to develop a flexible substrate having high elongation and resilience.

In the case of a stretchable display device including an electronic device such as an organic light emitting device, since the electronic device does not include flexibility, a change in the surface area due to the stretching of the stretchable substrate has a problem that the durability of the electronic device may be greatly reduced.

It is proposed that it can be applied as an application field of a display having elasticity, starting with a touch screen panel, a wearable display in the form of a fiber, and a display for medical purposes.

According to the necessity as described above, in forming an electronic device on the stretchable substrate, it is possible to maintain the durability of the electronic device, and it is necessary to develop a stretchable substrate having excellent adhesion between the electronic device and the stretchable substrate and excellent in stretchability.

Japanese Patent Publication No. 2006-299283

The present application is to provide a stretchable substrate and an electronic device including the same.

An exemplary embodiment of the present application is a stretchable polymer film having a recess on at least one side; A non-stretch pattern provided in the concave portion of the stretchable polymer film; And it is intended to provide a stretchable substrate including two or more spaced apart adhesive layer patterns provided on a surface opposite to the surface in contact with the stretchable polymer film of each of the non-stretch patterns.

In another embodiment, the stretchable substrate according to the present application; And an electronic device provided on a region of the stretchable substrate corresponding to the non-stretch pattern.

The stretchable substrate according to the exemplary embodiment of the present application includes a non-stretch pattern in the concave portion of the stretchable polymer film, so when an electronic device is disposed on the non-stretch pattern of the stretchable substrate later, the electronic device according to the stretching Due to the small change in the surface area of the arranged non-stretch pattern, the durability of the electronic device is greatly improved.

In addition, the stretchable substrate according to the present application includes two or more spaced apart adhesive layer patterns at corresponding positions on the non-stretchable pattern, and since the adhesive layer is not provided in a single layer form, the interface between the non-stretch pattern and the stretchable polymer film Since the adhesive layer is not provided, the electronic device can be stably stacked even when the stretching and contracting are repeated several times, thereby preventing the problem that the electronic device is detached from the stretchable substrate during the subsequent process.

The stretchable substrate according to the present application may have two or more spaced apart adhesive layer patterns on the opposite side of each of the non-stretchable patterns to the surface in contact with the stretchable polymer film, so that the adhesion to the electronic device may be excellent in the future. In particular, as the adhesive layer pattern in a spaced form is provided, the adhesive layer pattern can be positioned on the non-stretchable pattern more precisely than the adhesive layer in a single layer form, and accordingly, the alignment of the adhesive layer pattern in the manufacturing process is reduced. It has features that make it simpler.

1 is a side view showing a stretchable substrate according to an exemplary embodiment of the present application.
2 is a side view showing a stretchable polymer film according to an exemplary embodiment of the present application.
3 is a top view showing a stretchable substrate according to an exemplary embodiment of the present application.
4 is a side view showing a stretchable substrate according to an exemplary embodiment of the present application.
5 is a view showing a scanning electron microscope (SEM, Scanning Electron Microscopy) image of the stretchable substrate of Comparative Example 2 of the present application.

Hereinafter, the present specification will be described in more detail.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

An exemplary embodiment of the present application is a stretchable polymer film having a recess on at least one side; A non-stretch pattern provided in the concave portion of the stretchable polymer film; And it is intended to provide a stretchable substrate including two or more spaced apart adhesive layer patterns provided on a surface opposite to the surface in contact with the stretchable polymer film of each of the non-stretch patterns.

The stretchable substrate according to the present application may have two or more spaced apart adhesive layer patterns on the opposite side of each of the non-stretchable patterns to the surface in contact with the stretchable polymer film, so that the adhesion to the electronic device may be excellent in the future. In particular, as the adhesive layer pattern in a spaced form is provided, the adhesive layer pattern can be positioned on the non-stretchable pattern more precisely than the adhesive layer in a single layer form, and accordingly, the alignment of the adhesive layer pattern in the manufacturing process is reduced. It has features that make it simpler.

In addition, the stretchable substrate according to the present application includes two or more adhesive layer patterns at corresponding positions on each of the non-stretchable patterns, and the adhesive layer pattern is not provided on the interface between the non-stretchable pattern and the stretchable polymer film, so that it is stretched and contracted several times. Even in the case of repeating the method, the stacking of electronic devices can be stably made, so that the problem of the electronic devices being detached from the stretchable substrate during a subsequent process can be prevented.

In the exemplary embodiment of the present application, the stretchable polymer film has a concave portion on at least one side thereof, and as can be seen in FIG. 2, it can be confirmed that the stretchable polymer film 1 has a concave portion 4 on one side thereof. .

In the exemplary embodiment of the present application, the stretchable polymer film has a recess on at least one side, and the at least one side means that the stretchable polymer film may have a recess on one side, and more than one side of the stretchable polymer film It may mean that you can have a recess in.

In the exemplary embodiment of the present application, when the absolute value of the difference between the depth of the concave portion and the height of the non-stretch pattern is defined as M2, M2 is 0 μm or more and 10 μm or less.

In another exemplary embodiment, when the absolute value of the difference between the depth of the concave portion and the height of the non-stretch pattern is defined as M2, M2 is 0 μm or more and 10 μm or less, preferably 0 μm or more and 8 μm or less. , More preferably, it may be 0 μm or more and 5 μm or less.

In an exemplary embodiment of the present application, the absolute value of the depth of the concave portion and the height of the non-stretchable pattern is defined as M1, and the absolute value of the difference value between the depth of the concave portion and the height of the non-stretchable pattern is defined as M2. When doing so, the error range may be expressed as a value of M2/M1 x 100 (%), and the error range may have a value of 0.01% to 3%.

In the exemplary embodiment of the present application, the depth of the concave portion and the height of the non-stretch pattern may correspond to each other, and that the depth of the concave portion and the height of the non-stretch pattern correspond to each other may include the same.

In the present application, "the same" may mean that the depth of the concave portion of the stretchable polymer film and the height of the adhesive layer are the same, and may also include a case having a step difference. That is, the "identical" may include not only content including numerically the same, but also cases having a step difference.

The step difference means a difference between the height of the non-stretch pattern and the depth of the concave portion. In the exemplary embodiment of the present application, the step difference is the same as the definition of M2.

1 is a side view showing a stretchable substrate according to an exemplary embodiment of the present application. Specifically, the stretchable substrate is a stretchable polymer film (1) having a concave portion, a non-stretch pattern (2) provided in the concave, and two or more provided on the opposite side of the surface in contact with the stretchable polymer film of each of the non-stretch pattern It can be seen that it has a stacked structure of spaced apart adhesive layer patterns 3.

That is, the stretchable substrate according to the present application has two or more adhesive layer patterns at positions corresponding to the non-stretchable pattern, and has a feature that it is easier to place the adhesive pattern on the non-stretchable pattern compared to the case of having one adhesive layer pattern, In addition, since the adhesion to the electronic device is excellent, the durability of the electronic device is excellent in the future.

In an exemplary embodiment of the present application, the adhesive layer pattern provides a stretchable substrate comprising at least one selected from the group consisting of a silicone-based adhesive, an epoxy-based adhesive, a cyanoacrylate-based adhesive, and an acrylic adhesive.

In an exemplary embodiment of the present application, as the silicone adhesive, Shinetsu Corp. KR-3700.

In the exemplary embodiment of the present application, the acrylic adhesive is 3M's Optical Clear Adhesive (OCA).

In the exemplary embodiment of the present application, the adhesive layer pattern may be a silicone adhesive layer.

In the exemplary embodiment of the present application, the adhesive layer pattern may be an acrylic adhesive layer.

In the exemplary embodiment of the present application, the silicone-based adhesive layer includes a polyorgano siloxane and a curing catalyst.

In the case of the silicon-based adhesive layer, components and contents included in the silicon-based adhesive layer in the stretchable substrate as the surface exposed on the upper portion of the stretchable substrate can be confirmed by NMR (Nuclear Magnetic Resonace) analysis.

In the exemplary embodiment of the present application, the silicone-based adhesive layer may be formed by drying the silicone-based adhesive layer composition.

In the exemplary embodiment of the present application, the silicone-based adhesive layer may be formed by curing the silicone-based adhesive layer composition.

In the exemplary embodiment of the present application, the silicone-based adhesive layer composition is polyorgano siloxane; Curing catalyst; And a solvent.

In the exemplary embodiment of the present application, the solvent is not limited as long as it can dissolve the silicone-based adhesive layer composition, and specifically an organic solvent may be used, and more specifically, toluene may be used.

In the exemplary embodiment of the present application, the polyorganosiloxane may be included in 40 to 70 parts by weight, preferably 45 to 60 parts by weight, more preferably 45 to 55 parts by weight, based on 100 parts by weight of the silicone-based adhesive layer composition. have.

In the exemplary embodiment of the present application, the curing catalyst may be included in an amount of 0.1 to 2 parts by weight, preferably 0.2 to 1 part by weight, more preferably 0.3 to 0.8 parts by weight, based on 100 parts by weight of the silicone-based adhesive layer composition.

In the exemplary embodiment of the present application, the solvent may be included in an amount of 40 to 70 parts by weight, preferably 45 to 60 parts by weight, more preferably 45 to 55 parts by weight, based on 100 parts by weight of the silicone-based adhesive layer composition.

Since the stretchable substrate according to the present application has a silicon-based adhesive layer, the adhesive strength with the non-stretchable pattern can be maintained even when stretching and contracting are repeated.Since the silicone-based adhesive layer also has excellent elongation, it has excellent properties for application to a stretchable substrate. .

In the exemplary embodiment of the present application, the non-stretchable pattern has two or more island structures spaced apart from the stretchable polymer film, the line width of the non-stretchable pattern is D1, and the ratio of two adjacent to the stretchable polymer film The distance between the stretchable patterns is D2, and D1 and D2 provide a stretchable substrate that satisfies Equations 1 and 2 below.

[Equation 1]

30μm ≤ D1 ≤ 1000μm

[Equation 2]

D1/D2 ≤ 4

That the non-stretch pattern has two or more island structures spaced apart from the stretchable polymer film means that the non-stretch pattern has an island structure with regular intervals, or the non-stretch pattern includes all of the island structures with irregular intervals. can do. That is, the value of D2 may be the same or different among all non-stretch patterns.

In the present application, "adjacent" means that it is adjacent to, or is the closest neighbor from the target composition, and specifically, that the non-stretch pattern is adjacent is based on a specific non-stretch pattern. In this case, it means that the distance between the center of the specific non-stretch pattern and the center of the neighboring non-stretch pattern is the closest.

3 is a top view of the stretchable substrate according to the exemplary embodiment of the present application, and in detail, the line width 100 of the non-stretch pattern and the distance 200 between adjacent non-stretch patterns can be checked.

In the exemplary embodiment of the present application, the non-stretch pattern may have a polygonal cross section in a line width direction of the non-stretch pattern.

In the exemplary embodiment of the present application, the non-stretch pattern may be any one selected from the group consisting of a circle, a triangle, a square, a pentagon, and a hexagonal cross section in the line width direction of the non-stretch pattern.

In yet another exemplary embodiment, the non-stretchable pattern may have a square cross section in a line width direction of the non-stretchable pattern.

In the exemplary embodiment of the present application, Equation 1 may be 30 μm ≤ D1 ≤ 1000 μm, preferably 30 μm ≤ D1 ≤ 500 μm, and more preferably 30 μm ≤ D1 ≤ 100 μm.

In the exemplary embodiment of the present application, Equation 2 may be D1/D2 ≤ 4, preferably D1/D2 ≤ 2, and more preferably D1/D2 ≤ 1.

In another exemplary embodiment, Equation 2 may be D1/D2 ≥ 0.1, preferably D1/D2 ≥ 0.5, and more preferably D1/D2 ≥ 0.8.

In the exemplary embodiment of the present application, D2 may be 30 μm ≤ D2 ≤ 500 μm, preferably 55 μm ≤ D2 ≤ 300 μm, more preferably 65 μm ≤ D2 ≤ 100 μm.

As the stretchable substrate according to the present application satisfies the ranges of Equations 1 and 2 above, when the stretchable substrate of the present application is stretched, no separation occurs between the non-stretch pattern and the stretchable polymer film, and the stretchability satisfies the elongation and hardness It has the characteristics of manufacturing a substrate.

In an exemplary embodiment of the present application, the adhesive layer is in contact with one surface of the stretchable polymer film, and is provided on the stretchable polymer film and protrudes to the outside.

In the exemplary embodiment of the present application, the Young's Modulus of the stretchable polymer film is G1, the Young's Modulus of the non-stretchable pattern is G2, and G1 and G2 satisfy the following Equations 3 to 5 It provides a stretchable substrate.

[Equation 3]

G1 ≤ 2 MPa

[Equation 4]

G2 ≥ 1000 MPa

[Equation 5]

G2/G1 ≥ 500

The Young's modulus of the stretchable polymer film and the non-stretch pattern can be measured using Zwick/Roell's Z010 UTM equipment, and specifically, the stretchable polymer film and the non-stretchable material in the form of a film are 25±2°C and 50±5%. Under RH (relative humidity), after fixing both ends in the length direction so that the width is 25 mm and the length is 165 mm, the Young's modulus can be obtained through stress/strain measurement by stretching both ends in the length direction at a speed of 100 mm/min.

In the exemplary embodiment of the present application, Equation 3 may be G1 ≤ 2 MPa, preferably G1 ≤ 1.7 MPa, and more preferably G1 ≤ 1.5 MPa.

In another exemplary embodiment, Equation 3 may be G1 ≥ 0.01 MPa, preferably G1 ≥ 0.1 MPa, more preferably G1 ≥ 0.3 MPa.

In the exemplary embodiment of the present application, Equation 4 is G2 ≥ 1000 MPa, preferably G2 ≥ 2000 MPa, more preferably G2 ≥ 4000 MPa Can be

In another exemplary embodiment, Equation 4 is G2 ≤ 10000 MPa, preferably G2 ≤ 9000 MPa, more preferably G2 ≤ 8000 MPa Can be

In the exemplary embodiment of the present application, Equation 3 may be 0.01 MPa ≤ G1 ≤ 2 MPa, preferably 0.1 MPa ≤ G1 ≤ 1.7 MPa, more preferably 0.3 MPa ≤ G1 ≤ 1.5 MPa.

In the exemplary embodiment of the present application, Equation 4 may be 1000 MPa ≤ G2 ≤ 10000 MPa, preferably 2000 MPa ≤ G2 ≤ 8000 MPa, more preferably 4000 MPa ≤ G2 ≤ 8000 MPa.

As the stretchable substrate satisfies the range of Equation 3 and Equation 4, when the stretchable substrate is stretched uniaxially, no separation occurs at the interface between the non-stretch pattern and the stretchable polymer film. Accordingly, the durability of the electronic device in the future It becomes possible to have this excellent property.

In the exemplary embodiment of the present application, Equation 5 satisfies G2/G1 ≥ 500, preferably G2/G1 ≥ 1000, and more preferably G2/G1 ≥ 3000.

In another exemplary embodiment, Equation 5 satisfies G2/G1 ≤ 60000, preferably G2/G1 ≤ 30000, more preferably G2/G1 ≤ 20000.

In the exemplary embodiment of the present application, Equation 5 satisfies 500 ≤ G2/G1 ≤ 60000, preferably 2000 ≤ G2/G1 ≤ 30000, more preferably 3000 ≤ G2/G1 ≤ 20000.

As the stretchable substrate satisfies the above range of the stretchable polymer film and the non-stretchable pattern Young's modulus as shown in Equation 5, the stretchable substrate has excellent elongation and excellent durability.

In an exemplary embodiment of the present application, a line width of the non-stretch pattern is A1, a line width of the adhesive layer pattern is A2, and A1 and A2 satisfy Equation 6 below.

[Equation 6]

0.005 <A2/A1 <0.5

In the exemplary embodiment of the present application, the line width A1 of the non-stretch pattern has the same meaning as D1.

In the exemplary embodiment of the present application, the line width (A2) of the adhesive layer pattern is 5 μm ≤ A2 ≤ 500 μm, preferably 5 μm ≤ A2 ≤ 100 μm, more preferably 10 μm ≤ A2 ≤ 50 μm. Have.

When the line width (A1) of the non-stretchable pattern and the line width (A2) of the adhesive layer pattern satisfy the ranges of Equation 6, in particular, the adhesive layer pattern has excellent transfer characteristics.

3 shows a top view of the stretchable substrate according to an exemplary embodiment of the present application, and in detail, the relationship between the line widths A1 and 100 of the non-stretchable pattern and the line widths A2 and 300 of the adhesive layer pattern can be confirmed.

In the exemplary embodiment of the present application, Equation 6 may be 0.005 <A2/A1 <0.5, preferably 0.005 <A2/A1 <0.3, more preferably 0.01 <A2/A1 <0.1.

In the exemplary embodiment of the present application, a height of the adhesive layer pattern is 1 μm or more and 100 μm or less.

In another exemplary embodiment, the height of the adhesive layer pattern may be 5 μm or more and 80 μm or less, preferably 8 μm or more and 50 μm or less, and more preferably 10 μm or more and 30 μm or less.

When the height of the adhesive layer pattern satisfies the above range, the adhesive strength with the non-stretchable pattern is excellent, and the adhesive layer is not separated from the stretchable substrate even if it is repeatedly stretched and contracted several times, and an electronic device is subsequently laminated. It has excellent adhesion characteristics.

4 illustrates a side view of the stretchable substrate according to an exemplary embodiment of the present application, and in detail, the height 500 of the adhesive layer pattern can be confirmed.

In the exemplary embodiment of the present application, the height of the non-stretch pattern may be 5 μm or more and 100 μm or less.

The height of the non-stretch pattern means a height in a direction perpendicular to the line width direction of the non-stretch pattern. Specifically, the height 300 of the non-stretch pattern can be confirmed in FIG. 3.

In another embodiment, the height of the non-stretch pattern may be 5 μm or more and 100 μm or less, preferably 10 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less.

When the height of the non-stretch pattern satisfies the above range, in the subsequent stacking of the electronic device, the electronic device is not deformed, and when it is out of the above range, a separation occurs between the non-stretch pattern and the stretchable polymer film. The durability of the electronic device is poor.

In the exemplary embodiment of the present application, the total area of the opposite surface of the surface in contact with the stretchable polymer film of the one non-stretch pattern is B1, and two or more adhesive layer patterns formed on the one non-stretch pattern are the ratio of the one The total area of the surface in contact with the stretchable pattern is B2, and B1 and B2 satisfy the following Equation 7 to provide a stretchable substrate.

[Equation 7]

0.2 <B2/B1 <0.9

The area can be confirmed in FIG. 3, where B1 means the total area of one non-stretch pattern in FIG. 3 (indicated as a rectangular area in FIG. 3), and B2 is several stacked on one non-stretch pattern (FIG. 3). In the example, 9) means the total area of the adhesive layer pattern.

In the stretchable substrate according to the present application, the adhesive layer pattern may be provided on the non-stretch pattern, and the number and spacing of the adhesive layer patterns may be uniformly provided, but the line width of each position of the screen mask used to form the adhesive layer pattern According to the difference and drying properties of the adhesive layer composition, a difference in some line widths of the adhesive layer pattern may occur, and thus may be provided. That is, the stretchable substrate according to the present application is not limited thereto, even if the number and spacing of the adhesive layer patterns are different in the process of forming the adhesive layer pattern if it falls within the ranges of Equations 6 and 7 above.

In the exemplary embodiment of the present application, Equation 7 may be 0.2 <B2/B1 <0.9, preferably 0.3 <B2/B1 <0.9, and more preferably 0.5 <B2/B1 <0.8.

In the exemplary embodiment of the present application, as the stretchable substrate satisfies the range of Equation 7 above, in the case of manufacturing the stretchable substrate, when B1 and B2 have the same value (the adhesive layer in the same region is formed on the non-stretch pattern The transfer process of the adhesive layer pattern becomes more convenient than the case), and the adhesive layer pattern is not formed at the boundary between the non-stretch pattern and the stretchable polymer film, so that even when stretching the stretchable substrate, the stretching of the adhesive layer pattern can be minimized. The durability of electronic devices to be stacked later has particularly excellent characteristics.

In an exemplary embodiment of the present application, the number of adhesive layer patterns provided on the opposite surface of the surface in contact with the stretchable polymer film of each of the non-stretchable patterns is 2 or more and 36,000 or less.

In another exemplary embodiment, the number of adhesive layer patterns provided on the opposite side of the surface in contact with the stretchable polymer film of each of the non-stretch patterns is 2 or more and 10,000 or less, 4 or more and 5,000 or less, and preferably 6 or more and 1,000. It can be below.

In the exemplary embodiment of the present application, the number of the adhesive layer patterns is determined according to the size of the non-stretchable pattern, and is not limited to the above range, but as the adhesive layer patterns in a spaced form are in the above range, a single layer form Compared to having the adhesive layer of, the adhesive layer pattern can be positioned on the non-stretchable pattern more precisely, and the adhesive force to the electronic device can be increased in the future.

In the exemplary embodiment of the present application, the non-stretchable pattern is not particularly limited and can be used as long as it satisfies the Young's modulus of Equation 4, and a photocurable polymer material may be used, and specifically, a dry film resist for forming an electronic circuit board. , It may be selected from the group consisting of a photosensitive resin composition for column spacers and a photosensitive resin composition for forming an organic insulating pattern.

In an exemplary embodiment of the present application, a stretchable substrate is provided that is a polydimethylsiloxane (PDMS) having an elongation at break of 100% or more of the stretchable polymer film.

In another exemplary embodiment, the elongation at break of the stretchable polymer film may be 100% or more, preferably 110% or more, and more preferably 130% or more.

In another embodiment, the elongation at break of the stretchable polymer film may be 180% or less, preferably 170% or less.

The elongation at break of the stretchable polymer film means (L2-L1)/L1*100 (%) when the initial length of the stretchable polymer film is L1, and the length at which breakage occurs by stretching it is L2.

As the elongation at break of the stretchable polymer film satisfies the above range, the stretchable substrate having a structure in which the non-stretchy pattern is buried later has a characteristic that satisfies a specific range, and the stretchable polymer in the manufacturing process of the stretchable substrate As the elongation rate of the film has the above range, it has a property that is easy to handle.

In the exemplary embodiment of the present application, the stretchable polymer film is not particularly limited and can be used as long as it satisfies the Young's modulus of Formula 1, and a polydimethylsiloxane polymer material may be used, and specifically condensation polymerization type polydimethylsiloxane, It may be selected from the group consisting of addition polymerization type polydimethylsiloxane and radical polymerization type polydimethylsiloxane.

In the exemplary embodiment of the present application, the stretchable polymer film may be polydimethylsiloxane.

In an exemplary embodiment of the present application, after bonding the opposite surface of the adhesive layer pattern to the surface in contact with the non-stretchable pattern to a polyimide film (PI, Polyimide), the adhesive strength after leaving at 23°C and 50 RH% for 1 hour It may be 500 gf/inch or more.

In another exemplary embodiment, after bonding the opposite surface of the adhesive layer pattern to the surface in contact with the non-stretchable pattern to a polyimide film (PI, Polyimide), the adhesive strength after leaving at 23°C and 50 RH% for 1 hour is 500 gf/inch or more, preferably 600 gf/inch or more, more preferably 700 gf/inch or more, and 2000 gf/inch or less, preferably 1500 gf/inch or less.

After bonding the opposite surface of the adhesive layer pattern to the surface in contact with the non-stretchable pattern to a polyimide film (PI, Polyimide), the adhesive strength after leaving at 23° C. and 50 RH% for 1 hour satisfies the above conditions and ranges. When the electronic device is disposed on the adhesive layer, the electronic device can be stably stacked, and thus the problem of the electronic device being detached from the stretchable substrate during a subsequent process can be prevented.

In an exemplary embodiment of the present application, after bonding the surface of the adhesive layer pattern in contact with the non-stretch pattern, after leaving it at 23° C. and 50 RH% for 1 hour, an adhesive strength of 500 gf/inch or more is provided.

In another exemplary embodiment, after bonding the surface of the adhesive layer pattern in contact with the non-stretch pattern, the adhesive strength after leaving at 23° C. and 50 RH% for 1 hour is 500 gf/inch or more, preferably 600 gf/inch or more, further Preferably it may be 700gf/inch or more.

In another exemplary embodiment, after bonding the surface of the adhesive layer pattern in contact with the non-stretch pattern, the adhesive strength after leaving at 23°C and 50 RH% for 1 hour is 2000 gf/inch or less, preferably 1500 gf/inch or less, further Preferably it may be 1300 gf/inch or less.

As the adhesive force of the surface where the non-stretch pattern and the adhesive layer pattern meets the above range, in the manufacturing process of the present stretchable substrate, the adhesive layer pattern can be selectively laminated on the non-stretch pattern, In addition, even if the stretchable substrate is repeatedly stretched and recovered several times, it has a characteristic that it is not easily detached as it has a specific adhesive force.

In the present application, the adhesive strength is obtained by laminating a non-stretch pattern or a polyimide film on one side of the adhesive layer pattern of a glass substrate on which the adhesive layer pattern is provided after forming the adhesive layer pattern to a thickness of 20 μm on a glass substrate. After leaving for 1 hour at 23°C and 50 RH%, the adhesive strength can be measured while removing the non-stretch pattern or polyimide film from the adhesive layer at a 90° angle. (Stable Micro Systems' Texture Analyser)

In the exemplary embodiment of the present application, the thickness of the stretchable polymer film may be 100 μm or more and 1000 μm or less.

In another exemplary embodiment, the thickness of the stretchable polymer film may be 100 μm or more and 1000 μm or less, preferably 100 μm or more and 700 μm or less, and more preferably 200 μm or more and 500 μm or less.

As the stretchable polymer film satisfies the thickness range, the stretchability of the stretchable substrate of the present application is excellent, and by having the thickness range, the non-stretchable pattern and the stretchable polymer film have a characteristic that does not occur with respect to high elongation. do.

3 shows a side view of the stretchable substrate of the present application, and the thickness 400 of the stretchable polymer film can be confirmed.

In the exemplary embodiment of the present application, the stretch ratio of the stretchable substrate may be 20% or more.

In another exemplary embodiment, the stretch ratio of the stretchable substrate may be 20% or more, preferably 35% or more, more preferably 50% or more, and may satisfy a range of 150% or less, preferably 130% or less. have.

The elongation rate of the stretchable substrate means the maximum elongation rate at which no separation occurs between the stretchable polymer film and the non-stretch pattern, and the occurrence of a separation between the stretchable polymer film and the non-stretch pattern means that lifting has occurred. do. Specifically, when there is no separation, it means that the air layer is not visible, and the elastic substrate and the non-stretch pattern are well bonded, and when the separation occurs, it means that a space occurs.

That is, in the present application, the elongation rate of the stretchable substrate refers to the maximum elongation at which the separation does not occur according to the line width of the non-stretch pattern provided in the concave portion of the stretchable polymer film and the distance between adjacent non-stretch patterns, It may mean the maximum elongation at which the separation does not occur.

The elongation rate of the stretchable substrate was measured by stretching a stretchable substrate having a size of 2.5cm * 5cm to the left and right in the long axis direction, and measuring the elongation at the time when a separation occurs at the boundary between the non-stretch pattern and the stretchable polymer film.

In the end, the stretchable substrate is composed of a stretchable polymer film in which a non-stretchable pattern is embedded, and even when the stretch ratio of the stretchable substrate is within the above range, a stretchable substrate in which no separation occurs between the non-stretchable pattern and the stretchable polymer film. It has a manufacturable feature.

In the exemplary embodiment of the present application, when the stretchable substrate is stretched by 20%, a deformation of the non-stretchable pattern is 3% or less.

In another exemplary embodiment, when the stretchable substrate is stretched by 20%, the deformation of the non-stretchable pattern may be 3% or less, preferably 2% or less, and more preferably 1% or less.

In another exemplary embodiment, when the stretchable substrate is stretched, the deformation of the non-stretchable pattern may be 0.5% or more.

When the stretchable substrate is stretched by 20%, it means that the stretchable substrate is stretched by 20% based on the state of the initial stretchable substrate.

Deformation of the non-stretch pattern can be confirmed whether the non-stretch pattern is deformed through an optical microscope (OM) when the stretchable substrate is stretched. That is, the deformation of the non-stretch pattern may be measured by measuring the size of the initial non-stretch pattern before stretching the elastic substrate through a microscope (OM), and then calculating the ratio after the stretching.

Since the deformation of the non-stretchable pattern has the above range, the device can be stably supported when the device is deposited on the adhesive layer pattern in the future, and thus durability is increased.

In an exemplary embodiment of the present application, the stretchable substrate according to the present application; And an electronic device provided on a region of the stretchable substrate corresponding to the one non-stretch pattern.

In FIG. 2, the region corresponding to the one non-stretch pattern means that an electronic device is stacked on top of one non-stretch pattern. In this case, electrons are formed on the top of the non-stretch pattern through two or more spaced adhesive layers. It means that the devices are stacked.

In the exemplary embodiment of the present application, the electronic device may be a display device, a touch panel, or a semiconductor panel.

In the exemplary embodiment of the present application, the electronic device provides an electronic device selected from the group consisting of an organic photoelectric device, an organic transistor, an organic solar cell, a micro LED device, and an organic light emitting device.

When the electronic device according to the present application is used in a display device, it may include a display having elasticity, and as the electronic device is formed on the adhesive layer pattern of the stretchable substrate, the electronic device itself Since it is possible to minimize the external force applied to the device, it has the characteristics of providing a display device having excellent elongation and excellent durability.

Particularly, since the stretchable substrate according to the present application includes an adhesive layer pattern of a specific adhesive force range, the electronic device can be stably disposed on the stretchable substrate even when stretching and resetting are repeated.

The stretchable substrate according to the exemplary embodiment of the present application includes: forming a stretchable substrate in which a non-stretchable pattern is embedded; And transferring the adhesive layer pattern onto the stretchable substrate.

Specifically, the forming of the stretchable substrate in which the non-stretch pattern is buried may include preparing a copper foil; Laminating a protective film on one side of the copper foil; Forming a non-stretch pattern on the opposite surface of the surface on which the protective film of the copper foil is laminated; Applying an elastic polymer film on the copper foil on which the non-stretch pattern is formed; And it can be prepared through the step of removing the protective film and the copper foil.

In addition, transferring the adhesive layer pattern onto the stretchable substrate may include preparing a substrate; Forming an adhesive layer pattern on one surface of the substrate; And laminating the substrate on which the adhesive layer pattern is formed on the surface of the non-stretch pattern of the stretchable substrate to manufacture a stretchable substrate provided with the adhesive layer pattern according to the present application.

In other words, in the stretchable substrate according to the present application, the adhesive layer pattern is selectively transferred on the top of the non-stretch pattern with high surface energy, and it is more convenient in the process than disposing the adhesive layer pattern at a position corresponding to the top of the existing non-stretch pattern. Have a characteristic.

In the exemplary embodiment of the present application, the step of forming the non-stretchable pattern may be formed using a photolithography process.

In the exemplary embodiment of the present application, the protective film and the copper foil may be removed after the step of applying the stretchable polymer film.

In the exemplary embodiment of the present application, the copper foil may be removed using an etchant, and the etchant may be an iron chloride-based copper etchant.

In the exemplary embodiment of the present application, the forming of the adhesive layer pattern on one surface of the substrate may include forming a mask pattern on one surface of the substrate through a photography process; Forming an adhesive layer on the substrate on which the mask pattern is formed; And it may be formed according to the step of removing the mask pattern.

Hereinafter, the present specification will be described in more detail through examples. However, the following examples are for illustrative purposes only and are not intended to limit the present specification.

< Manufacturing example >

< Example 1>

1. Preparation of adhesive layer pattern film

After applying polydimethylsiloxane (KE-441K-T from Shin-Etsu Co., Ltd.) to a thickness of 200 µm on the 250 µm thick PET film, it is cured at room temperature for 72 hours. A screen mask and silicone adhesive layer composition (100 parts by weight of Shin-Etsu's KR-3700 and Shin-Etsu's CAT-PL) having an average diameter of 50 µm, a distance between patterns, and a thickness of 50 µm on the top of the laminate. -50T 0.5 parts by weight) was used to form an adhesive layer pattern having an average diameter of 55 µm, a distance between patterns of 45 µm, and a height of 40 µm.

2. Inelastic Fabrication of a pattern-embedded stretchable substrate

A 10 μm-thick copper foil with a protective film laminated on one side is prepared. The ratio of a square with a non-stretch pattern line width of 500 μm and a distance between non-stretch patterns is 500 μm through a photo process after laminating a 25 μm-thick DFR (Dry Film Resist, Hitachi Chemical) as a photocurable polymer material on the top of the copper foil. To form an elastic pattern. KE-441K-T (Shinetsu Corp.) as a polydimethylsiloxane material was applied to a thickness of 300 μm on the laminate with the non-stretch pattern, and then cured at room temperature for 72 hours, followed by heat treatment at 100° C. for 1 hour.

After removing the protective film from the laminate having the polydimethylsiloxane polymer layer, the exposed copper foil was removed using a ferric chloride-based copper etchant to prepare a stretchable polymer film in which a non-stretch pattern was embedded.

3. Manufacture of final stretchable substrate through transfer of adhesive layer pattern

The non-stretch pattern exposed surface of the stretchable substrate in which the non-stretch pattern is embedded and the adhesive layer pattern-providing surface of the adhesive layer pattern film were positioned to face each other, and then roll-laminated at a rate of 1.3 mpm (meter per minute). After the lamination was completed, the adhesive layer pattern film was removed from the stretchable substrate in which the non-stretch pattern was embedded, and the adhesive layer pattern was selectively transferred on the non-stretchable pattern.

< Example 2>

In Example 1, instead of the silicone-based adhesive layer composition (100 parts by weight of Shin-Etsu Corp. KR-3700 and 0.5 parts by weight of Shin-Etsu Corp. CAT-PL-50T), an acrylic adhesive layer composition (3M company pLOCA EAS-2290) as an adhesive layer composition. ) Was prepared in the same manner as in Example 1, except for applying, to prepare a stretchable substrate.

< Example 3>

In Example 1, a stretchable substrate was prepared in the same manner as in Example 1, except that the average diameter of the adhesive layer pattern was 30 µm and the distance between patterns was 70 µm.

< Comparative example 1>

A 10 μm-thick copper foil with a protective film laminated on one side is prepared. The ratio of a square with a non-stretch pattern line width of 500 μm and a distance between non-stretch patterns is 500 μm through a photo process after laminating a 25 μm-thick DFR (Dry Film Resist, Hitachi Chemical) as a photocurable polymer material on the top of the copper foil. To form an elastic pattern. KE-441K-T (Shinetsu Corp.) as a polydimethylsiloxane material was applied to a thickness of 300 μm on the laminate with the non-stretch pattern, and then cured at room temperature for 72 hours, followed by heat treatment at 100° C. for 1 hour.

After removing the protective film from the laminate having the polydimethylsiloxane polymer layer, the exposed copper foil was removed using a ferric chloride-based copper etchant to prepare a stretchable polymer film in which a non-stretch pattern was embedded.

A silicon-based adhesive layer (100 parts by weight of Shin-Etsu's KR-3700 and 0.5 parts by weight of Shin-Etsu's CAT-PL-50T) was provided on the entire surface of the stretchable substrate in which the non-stretchy pattern was embedded, to prepare a stretchable substrate.

< Comparative example 2>

In Example 1, a stretchable substrate was manufactured in the same manner as in Example 1, except that the average diameter of the adhesive layer pattern was 500 μm and the distance between patterns was 500 μm.

For the stretchable substrates of Examples 1 to 3 and Comparative Examples 1 and 2, the adhesive strength and durability according to the composition and physical properties of the non-stretch pattern and the adhesive layer pattern are shown in Table 1 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative example 2 Inelastic Pattern line width/ Between patterns Street 500㎛/500㎛ 500㎛/500㎛ 500㎛/500㎛ 500㎛/500㎛ 500㎛/500㎛ Adhesive layer pattern line width/distance between patterns 55㎛/45㎛ 55㎛/45㎛ 30㎛/70㎛ Introduction of front adhesive layer 500㎛/500㎛ Adhesive layer composition Silicone adhesive layer Acrylic adhesive layer Silicone adhesive layer Silicone adhesive layer Silicone adhesive layer Adhesive layer pattern area ratio (B2/B1) 0.3 0.3 0.1 One Impossible to measure (Due to dimensional error during the transfer process, 1:1 response is not possible) Adhesive layer pattern-non-stretch tile? Liver adhesion 600gf/inch 550 gf/inch 230 gf/inch 980 gf/inch 530 gf/inch Adhesive Layer Pattern-Polyimide Between films Adhesion 580gf/inch 510 gf/inch 180 gf/inch 900 gf/inch 500 gf/inch Observation of durability at 20% tension No boundary separation No boundary separation No boundary separation Observation of damage to the adhesive layer on the upper boundary of the non-stretch pattern Observation of damage to the adhesive layer on the upper boundary of the non-stretch pattern

In Table 1, the observation of durability at the time of 20% tensile is performed by repeating the stretchable substrates of Examples 1 to 3 and Comparative Examples 1 and 2 10 times and 20% stretching and restoring, and then scanning electrons in the restored state of the stretchable substrate. When observed with a SEM (Scanning Electron Microscopy) image, it was confirmed based on whether a separation of the boundary occurred.

As can be seen from Table 1 above, the stretchable substrate according to the present application has a non-stretchable pattern in the concave portion of the stretchable polymer film, so when an electrical device is disposed on the stretchable substrate later, the surface area change due to stretching is small, It was confirmed that the device has a feature of greatly improving durability.

In the case of Examples 1 and 2 in Table 1 above, the line width of the adhesive layer pattern/the distance between the adhesive layer patterns satisfies 55 μm/45 μm, respectively, and the durability of the adhesive layer is excellent as it has two or more separated adhesive layers, It was confirmed that the adhesion between the adhesive layer pattern and the electronic device to be laminated later was also particularly excellent.

The stretchable substrate according to the present application may have two or more spaced adhesive layer patterns on the opposite side of the surface in contact with the stretchable polymer film of each non-stretch pattern, so that it may have excellent characteristics of adhesion to electronic devices in the future. By having the adhesive layer pattern in the form of a single layer, the adhesive layer pattern can be positioned on the non-stretchable pattern more precisely than having the adhesive layer in the form of a single layer (Comparative Example 1), and accordingly, alignment of the adhesive layer pattern in the manufacturing process ) Has been confirmed to have the feature of being simple.

In particular, in the case of Comparative Example 1, in the case of having a single-layered adhesive layer, the adhesive strength between the adhesive layer and the electronic device to be laminated in the future may maintain a certain range, but the case of repeating expansion and contraction several times as having a single-layered adhesive layer It was confirmed that damage to the adhesive layer occurred, and accordingly, it was confirmed that the durability of the electronic device was reduced.

In the case of Comparative Example 2, when the adhesive layer is laminated in a pattern shape on the non-stretch pattern, but the adhesive layer pattern and the non-stretch pattern that are not in two or more spaced apart forms correspond 1:1 (the non-stretch pattern line width and the adhesive layer pattern line width With this same), the adhesive strength between the adhesive layer and the electronic device to be laminated in the future can be maintained within a certain range, but it was confirmed that damage to the adhesive layer occurs when the adhesive layer is repeatedly stretched and contracted several times as it has a 1:1 correspondence type. Accordingly, it was confirmed that the durability of the electronic device decreased.

5 is a diagram showing a scanning electron microscope (SEM) image after stretching the stretchable substrate of Comparative Example 2 by 20%. It was possible to confirm whether the upper adhesive layer of the boundary of the non-stretch pattern was deformed, and it could be confirmed that tearing and steps of the adhesive layer pattern on the boundary of the non-stretch pattern were generated.

1: stretchable polymer film
2: inelastic pattern
3: adhesive layer pattern
4: recess
100: line width of non-stretch pattern
200: distance between adjacent non-stretch patterns
300: line width of the adhesive layer pattern
400: thickness of the stretchable polymer film
500: height of the adhesive layer pattern

Claims (16)

A stretchable polymer film having a concave portion on at least one side;
A non-stretchable pattern provided in the concave portion of the stretchable polymer film; And
Two or more spaced apart adhesive layer patterns provided on opposite surfaces of the surfaces of each of the non-stretchable patterns in contact with the stretchable polymer film;
Stretchable substrate comprising a. The method according to claim 1,
When the absolute value of the difference value between the depth of the recess and the height of the non-stretch pattern is defined as M2, M2 is 0 μm or more and 10 μm or less. The method according to claim 1,
The adhesive layer pattern is a stretchable substrate comprising at least one selected from the group consisting of a silicone adhesive, an epoxy adhesive, a cyanoacrylate adhesive, and an acrylic adhesive. The method according to claim 1,
The non-stretchable pattern has two or more island structures spaced apart from the stretchable polymer film,
The line width of the non-stretch pattern is D1,
The distance between two adjacent non-stretchable patterns on the stretchable polymer film is D2,
The stretchable substrates D1 and D2 satisfy the following Equations 1 and 2:
[Equation 1]
30μm ≤ D1 ≤ 1000μm
[Equation 2]
D1/D2 ≤ 4 The method according to claim 1,
The Young's Modulus of the stretchable polymer film is G1,
The Young's Modulus of the non-stretch pattern is G2,
The stretchable substrate that G1 and G2 satisfies the following Equations 3 to 5:
[Equation 3]
G1 ≤ 2 MPa
[Equation 4]
G2 ≥ 1000 MPa
[Equation 5]
G2/G1 ≥ 500 The method according to claim 1,
The line width of the non-stretchable pattern is A1, the line width of the adhesive layer pattern is A2,
The stretchable substrates A1 and A2 satisfy the following Equation 6:
[Equation 6]
0.005 <A2/A1 <0.5 The method according to claim 1,
The total area of a surface opposite to the surface of the one non-stretchable pattern in contact with the stretchable polymer film is B1, B2,
The stretchable substrates B1 and B2 satisfy Equation 7:
[Equation 7]
0.2 <B2/B1 <0.9 The method according to claim 1,
The number of adhesive layer patterns provided on the opposite surface of each of the non-stretchable patterns to the surface in contact with the stretchable polymer film is 2 or more and 36,000 or less. The method according to claim 1,
The stretchable substrate of the stretchable polymer film is polydimethylsiloxane (PDMS) having an elongation at break of 100% or more. The method according to claim 1,
Stretchable substrate having an adhesive strength of 500 gf/inch or more after bonding the opposite surface of the adhesive layer pattern to the surface in contact with the non-stretchable pattern to a polyimide film (PI, Polyimide), and leaving it for 1 hour at 23°C and 50 RH% . The method according to claim 1,
After bonding the surface of the adhesive layer pattern in contact with the non-stretchable pattern, the adhesive strength after leaving at 23°C and 50 RH% for 1 hour is 500 gf/inch or more. The method according to claim 1,
When the stretchable substrate is stretched by 20%, the deformation of the non-stretchable pattern is 3% or less. The method according to claim 1,
The stretchable substrate that the thickness of the stretchable polymer film is 100 μm or more and 1000 μm or less. The method according to claim 1,
The stretchable substrate to which the stretch ratio of the stretchable substrate is 20% or more. The stretchable substrate according to any one of claims 1 to 14; And
An electronic device provided on a region of the stretchable substrate corresponding to the non-stretch pattern;
Electronic device comprising a. The method of claim 15,
The electronic device is
An electronic device selected from the group consisting of an organic photoelectric device, an organic transistor, an organic solar cell, a micro LED device, and an organic light emitting device.

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