Resin composition, adhesive meber, and display device including the same

Abstract

The resin composition of one embodiment comprises a (meth)acrylate (A) containing hydroxyl groups and having a molecular weight of 500 or less, and a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and having a molecular weight of 2,000 or more and 35,000 or less, and has the characteristics that the glass transition temperature after curing is -50°C or higher and 0°C or lower, and the viscosity at 20°C or higher and 30°C or lower measured by the JIS K 2283 method is 5 mPa·s or higher and 50 mPa·s or lower. The resin composition of one embodiment has low viscosity characteristics in a liquid state and can exhibit good coating properties, and the adhesive member of one embodiment formed by photocuring the resin composition has excellent durability under low and high temperature conditions and exhibits high bending adhesion under repeated folding conditions, so it can be used in a flexible display device and exhibit excellent reliability characteristics.

Description

Technology Field

[0001] The present invention relates to a resin composition, an adhesive member formed from the resin composition, and a display device including the adhesive member. Background Technology

[0002] Various display devices used in multimedia devices such as televisions, mobile phones, tablet computers, navigation systems, and game consoles are being developed. In particular, recently, in order to make them portable and improve user convenience, development is underway for display devices that can be folded, bent, or rolled by providing a flexible display member.

[0003] In the case of such flexible display devices, each component used needs to ensure reliability in folding or bending operations. In addition, the adhesive resin used to form an adhesive layer applied to display devices of various shapes needs to have excellent coating properties for components of display devices of various shapes. The problem to be solved

[0004] The objective of the present invention is to provide a resin composition having excellent applicability and capable of exhibiting a low glass transition temperature after curing, and an adhesive member manufactured therefrom.

[0005] In addition, the objective of the present invention is to provide a display device with excellent reliability in operating states such as folding, comprising an adhesive member having excellent durability and stability under high and low temperature conditions and high bending adhesion. means of solving the problem

[0006] A resin composition according to one embodiment of the present invention comprises a (meth)acrylate (A) having a hydroxyl group and a molecular weight of 500 or less, and a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and a molecular weight of 2,000 or more and 35,000 or less, and after curing, the glass transition temperature is -50°C or higher and 0°C or lower, and the viscosity at 20°C or higher and 30°C or lower measured by the JIS K 2283 method is 5 mPa·s or higher and 50 mPa·s or lower.

[0007] A resin composition according to one embodiment of the present invention may further include a monofunctional (meth)acrylate (C) different from the (meth)acrylate (A).

[0008] A resin composition according to one embodiment of the present invention may comprise, with respect to the total amount of the resin composition, 5% by weight or more and 30% by weight or less of the (meth)acrylate (A), 0.1% by weight or more and 5% by weight or less of the polymer (B), and 50% by weight or more and 88% by weight or less of the monofunctional (meth)acrylate (C).

[0009] In a resin composition according to one embodiment of the present invention, at least one of the (meth)acrylate (A), the polymer (B), and the monofunctional (meth)acrylate (C) may be included in two or more types.

[0010] A resin composition according to one embodiment of the present invention may further include a urethane (meth)acrylate oligomer (D) having a molecular weight of 6000 or more.

[0011] A resin composition according to one embodiment of the present invention may include 1% or more and 15% or less of the urethane (meth)acrylate oligomer (D) with respect to the total amount of the resin composition.

[0012] A resin composition according to one embodiment of the present invention may have a 180° peel strength of 1000 gf / 25mm or more for polyethylene terephthalate (PET) film and glass after curing.

[0013] A resin composition according to one embodiment of the present invention may further include at least one radical polymerization initiator.

[0014] A resin composition according to one embodiment of the present invention further comprises an organic solvent, and the organic solvent may be included in an amount of 1 weight% or less relative to the total amount of the resin composition.

[0015] An adhesive member according to one embodiment of the present invention comprises a (meth)acrylate (A) having a hydroxyl group and a molecular weight of 500 or less, and a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and a molecular weight of 2,000 or more and 35,000 or less, and a polymer derived from a resin composition having a viscosity of 5 mPa·s or more and 50 mPa·s or less at 20°C or more and 30°C or less as measured by the JIS K 2283 method, and a glass transition temperature of -50°C or more and 0°C or less.

[0016] The above polymer may be a photocured resin composition.

[0017] A display device according to one embodiment of the present invention comprises a display panel, a window disposed on the display panel, and an adhesive member disposed between the display panel and the window, wherein the adhesive member comprises a (meth)acrylate (A) having a hydroxyl group and a molecular weight of 500 or less, and a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and having a molecular weight of 2,000 or more and 35,000 or less, and is derived from a resin composition having a viscosity of 5 mPa·s or more and 50 mPa·s or less at 20°C or more and 30°C or less as measured by the JIS K 2283 method, and has a glass transition temperature of -50°C or more and 0°C or less.

[0018] The thickness of the adhesive member may be 50 μm or more and 200 μm or less.

[0019] A display device according to one embodiment of the present invention further includes an input sensing unit disposed on the display panel, and the adhesive member may be disposed between the display panel and the input sensing unit or between the input sensing unit and the window.

[0020] The above display panel includes a display element layer and an encapsulation layer disposed on the display element layer, the input sensing member is disposed directly on the encapsulation layer, and the adhesive member may be disposed on the input sensing member.

[0021] The adhesive member may be formed by directly providing the resin composition onto one side of the window or one side of the display panel and curing the provided resin composition with ultraviolet light.

[0022] A display device according to one embodiment of the present invention includes at least one folding area, and the radius of curvature of the folding area may be 5 mm or less.

[0023] A display device according to one embodiment of the present invention further comprises a light control layer disposed between the adhesive member and the window, and an optical adhesive layer disposed between the light control layer and the window, wherein the optical adhesive layer may comprise a polymer derived from the resin composition. Effects of the invention

[0024] The resin composition of one embodiment has low viscosity characteristics and can exhibit excellent coating properties on substrates of various shapes.

[0025] The adhesive member of one embodiment has a low glass transition temperature, excellent adhesion properties to glass and polymer films, and can exhibit excellent durability and stability under high and low temperature conditions.

[0026] A display device of one embodiment includes an adhesive member having high flexibility adhesion, and can exhibit excellent reliability in various operating conditions. Brief explanation of the drawing

[0027] FIG. 1 is a perspective view of a display device of one embodiment. Figure 2 is a drawing showing the folded state of the display device illustrated in Figure 1. FIG. 3 is a perspective view of a display device of one embodiment. Figure 4 is a drawing showing the folded state of the display device illustrated in Figure 3. FIG. 5 is a perspective view of a display device of one embodiment. FIG. 6 is an exploded perspective view of a display device of one embodiment. FIG. 7 is a cross-sectional view of a display device of one embodiment. FIGS. 8a to 8c are drawings illustrating a method for manufacturing an adhesive member of one embodiment. FIGS. 9A and FIGS. 9B are drawings illustrating a method for manufacturing an adhesive member of one embodiment. FIG. 10 is a cross-sectional view of a display device of one embodiment. FIG. 11 is a cross-sectional view of a display device of one embodiment. Specific details for implementing the invention

[0028] The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0029] In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "combined" with another component, it means that it may be directly placed / connected / combined with the other component, or that a third component may be placed between them.

[0030] Meanwhile, in the present application, "direct placement" may mean that there are no additional layers, films, regions, plates, etc. added between a part such as a layer, film, region, or plate and another part. For example, "direct placement" may mean that two layers or two members are placed without using additional members such as adhesive members between them.

[0031] Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective illustration of the technical content.

[0032] "And / or" includes all one or more combinations that the associated configurations can define.

[0033] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0034] Additionally, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components illustrated in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings. In this specification, "placed on" may refer to a case where a component is placed not only on the upper side but also on the lower side.

[0035] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Additionally, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and unless interpreted in an ideal or overly formal sense, they are interpreted as explicitly defined herein.

[0036] Terms such as "include" or "have" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0037] Hereinafter, a resin composition, an adhesive member, and a display device according to one embodiment of the present invention will be described with reference to the drawings.

[0038] FIG. 1 is a perspective view of a display device according to one embodiment. FIG. 2 is a drawing showing the folded state of the display device shown in FIG. 1.

[0039] Referring to FIG. 1, a display device (DD) of one embodiment may have a rectangular shape having long sides extending in the direction of a first direction axis (DR1) and short sides extending in the direction of a second direction axis (DR2) intersecting the first direction axis (DR1). However, the embodiment is not limited thereto, and the display device (DD) may have various shapes such as a circle and a polygon on a plane. The display device (DD) may be a flexible display device.

[0040] In a display device (DD) according to one embodiment, the display surface (DS) on which an image (IM) is displayed may be parallel to the surface defined by the first direction axis (DR1) and the second direction axis (DR2). The normal direction of the display surface (DS), that is, the thickness direction of the display device (DD), is indicated by the third direction axis (DR3). The front (or top) surface and the back (or bottom) surface of each member are distinguished by the third direction axis (DR3). However, the directions indicated by the first to third direction axes (DR1, DR2, DR3) are relative concepts and can be converted to other directions. Hereinafter, the first to third directions refer to the same reference numerals as the directions indicated by the first to third direction axes (DR1, DR2, DR3), respectively.

[0041] A display device (DD) of one embodiment may include at least one folding region (FA). Referring to FIGS. 1 and 2, the display device (DD) may include a folding region (FA) and a plurality of non-folding regions (NFA). The folding region (FA) is positioned between the non-folding regions (NFA), and the folding region (FA) and the non-folding regions (NFA) may be arranged adjacently in the direction of a first directional axis (DR1).

[0042] The folding region (FA) may be a part that can be deformed into a folded shape based on a folding axis (FX) that extends in the direction of a second direction axis (DR2) which is unidirectional. The radius of curvature (RD) of the folding region (FA) may be 5 mm or less.

[0043] In FIGS. 1 and 2, one folding region (FA) and two non-folding regions (NFA) are illustrated as examples, but the number of folding regions (FA) and non-folding regions (NFA) is not limited thereto. For example, a display device (DD) may include more than two non-folding regions (NFA) and multiple folding regions (FA) placed between the non-folding regions (NFA).

[0044] In a display device (DD) of one embodiment, non-folding regions (NFA) may be arranged symmetrically with respect to a folding region (FA). However, the embodiment is not limited thereto, and a folding region (FA) may be arranged between non-folding regions (NFA), and the areas of two non-folding regions (NFA) facing each other with respect to the folding region (FA) may be different from each other.

[0045] The display surface (DS) of the display device (DD) may include a display area (DA) and a non-display area (NDA) surrounding the display area (DA). The display area (DA) may display an image, and the non-display area (NDA) may not display an image. The non-display area (NDA) may surround the display area (DA) and define the border of the display device (DD).

[0046] Referring to FIG. 2, the display device (DD) may be a foldable display device (DD) that can be folded or unfolded. For example, the display device (DD) may be folded by bending the folding area (FA) with respect to a folding axis (FX) parallel to the second direction axis (DR2). The folding axis (FX) may be defined as a short axis parallel to the short side of the display device (DD).

[0047] When the display device (DD) is folded, the non-folding regions (NFA) face each other, and the display device (DD) can be in-folded so that the display surface (DS) is not exposed to the outside. However, the embodiment is not limited thereto, and unlike what is shown in the drawing, the display device (DD) can be out-folded so that the display surface (DS) is exposed to the outside.

[0048] FIG. 3 is a perspective view of a display device according to one embodiment. FIG. 4 is a drawing showing the folded state of the display device shown in FIG. 3.

[0049] Except for the folding operation, the display device (DD-a) illustrated in FIG. 3 may have substantially the same configuration as the display device (DD) illustrated in FIG. 1. Therefore, the following description of the display device (DD-a) illustrated in FIG. 3 and FIG. 4 will focus on the folding operation.

[0050] Referring to FIGS. 3 and 4, the display device (DD-a) may include a folding region (FA-a) and a plurality of non-folding regions (NFA-a). The folding region (FA-a) is positioned between the non-folding regions (NFA-a), and the folding region (FA-a) and the non-folding regions (NFA-a) may be arranged adjacently in the direction of a second directional axis (DR2).

[0051] The folding area (FA-a) can be bent along a folding axis (FX-a) parallel to the first directional axis (DR1), so that the display device (DD-a) can be folded. The folding axis (FX-a) can be defined as a major axis parallel to the major side of the display device (DD-a). The display device (DD) shown in FIG. 1 is folded along the minor axis, whereas the display device (DD-a) shown in FIG. 3 can be folded along the major axis. In FIG. 4, the display device (DD-a) is shown as being in-folded so that the display surface (DS) is not exposed to the outside, but the embodiment is not limited thereto, and the display device (DD-a) may be folded along the major axis and out-folded.

[0052] FIG. 5 is a perspective view of a display device according to one embodiment. The display device (DD-b) of one embodiment includes a bending area (BA1, BA2) and a non-bending area (NBA), and the bending area (BA1, BA2) may be bent from one side of the non-bending area (NBA).

[0053] Referring to FIG. 5, a display device (DD-b) of one embodiment may include a non-bending area (NBA) in which an image (IM) is displayed on the front, a first bending area (BA1) and a second bending area (BA2) in which an image (IM) is displayed on the side. The first bending area (BA1) and the second bending area (BA2) may be bent from both sides of the non-bending area (NBA), respectively.

[0054] Referring to FIG. 5, the non-bending area (NBA) may provide an image (IM) in the direction of the third direction axis (DR3), which is the front of the display device (DD-b), the first bending area (BA1) may provide an image in the direction of the fifth direction axis (DR5), and the second bending area (BA2) may provide an image in the direction of the fourth direction axis (DR4). The fourth direction axis (DR4) and the fifth direction axis (DR5) may be directions that intersect the first to third direction axes (DR1, DR2, DR3). However, the directions indicated by the first to fifth direction axes (DR1 to DR5) are relative concepts and are not limited to the directional relationships shown in the drawings.

[0055] A display device (DD-b) of one embodiment may be a bending display device comprising a non-bending area (NBA) and bending areas (BA1, BA2) respectively disposed on both sides of the non-bending area (NBA). Additionally, although not illustrated, a display device of one embodiment may be a bending display device comprising one non-bending area and one bending area. In this case, the bending area may be provided by bending only on one side of the non-bending area.

[0056] Although foldable display devices and bending display devices, etc., have been illustrated and described in FIGS. 1 to 5 above, the embodiments are not limited thereto. A display device of one embodiment may be a rollable display device, a flat rigid display device, or a curved rigid display device.

[0057] In the following description of a display device of one embodiment, the description is based on a display device (DD) that folds along a short axis, but the embodiment is not limited thereto, and the contents described below can be applied to various types of display devices, including a display device (DD-a) that folds along a long axis and a display device (DD-b) that includes a bending area.

[0058] FIG. 6 is an exploded perspective view of a display device (DD) of one embodiment. FIG. 7 is a cross-sectional view of a display device (DD) of one embodiment. FIG. 7 may be a cross-sectional view of a portion corresponding to line I-I' of FIG. 1.

[0059] A display device (DD) of one embodiment may include a display module (DM) and a window (WP) disposed on the display module (DM). In a display device (DD) of one embodiment, the display module (DM) may include a display panel (DP) comprising a display element layer (DP-EL) and an input sensing unit (TP) disposed on the display panel (DP). A display device (DD) of one embodiment may include an adhesive member (AP) disposed between the display panel (DP) and the window (WP). For example, in a display device (DD) of one embodiment, the adhesive member (AP) may be disposed between the input sensing unit (TP) and the window (WP). The adhesive member (AP) may be an optically clear adhesive film (OCA) or an optically clear adhesive resin layer (OCR).

[0060] The adhesive member (AP) may be formed from the resin composition of one embodiment. The adhesive member (AP) may include a polymer derived from the resin composition of one embodiment.

[0061] A resin composition of one embodiment comprises a (meth)acrylate (A) having a hydroxyl group and a molecular weight of 500 or less, and a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and a molecular weight of 35,000 or less. Meanwhile, in this specification, (meth)acrylate refers to acrylate or methacrylate.

[0062] In the resin composition of one embodiment, the (meth)acrylate (A) is a (meth)acrylate having a weight average molecular weight (Mw) of 100 or more and 500 or less. The (meth)acrylate (A) is a (meth)acrylate containing at least one hydroxyl group within one molecule. The (meth)acrylate (A) may comprise a plurality of different (meth)acrylates. That is, the resin composition of one embodiment may comprise two or more types of (meth)acrylates (A). For example, in the resin composition of one embodiment, the (meth)acrylate (A) may comprise one type of hydroxypropyl acrylate and one type of hydroxyethyl acrylate.

[0063] (Metha)acrylate (A) may include hydroxybutyl acrylate, hydroxypropyl acrylate, hydroxyethyl acrylate, or a mixture thereof. The resin composition of one embodiment may include 4-hydroxybutyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl acrylate, or a mixture thereof as (Metha)acrylate (A).

[0064] The resin composition of one embodiment may contain (meth)acrylate (A) in an amount of 5% by weight or more and 30% by weight or less, based on 100% by weight of the total resin composition. The resin composition of one embodiment contains (meth)acrylate (A) in an amount of 5% by weight or more and 30% by weight or less, so that in the resin state, it exhibits low viscosity characteristics of 5 mPa·s or more and 50 mPa·s or less, and after photocuring, it may have a glass transition temperature of -50°C or more and 0°C or less. As the resin composition of one embodiment contains (meth)acrylate (A) in an amount of 5% by weight or more and 30% by weight or less, the adhesive member formed by curing the resin composition of one embodiment may have high adhesion to polyethylene terephthalate film and glass, and may have flexibility to be applicable to a folding device.

[0065] In the resin composition of one embodiment, the polymer (B) has a weight average molecular weight of 2,000 or more and 35,000 or less. The polymer (B) is a polymeric material having at least one radical reactive group within a single molecule and having polyisoprene or polybutadiene as its main backbone. The polymer (B) may include a plurality of different polymeric materials. That is, the resin composition of one embodiment may include two or more types of polymers (B). For example, in the resin composition of one embodiment, the polymer (B) may include one type of polyisoprene compound having a radical reactive group and one type of polybutadiene compound having a radical reactive group.

[0066] The polymer (B) may include a polyisoprene compound having radical curable groups, a polybutadiene compound having radical curable groups, or a mixture thereof. The resin composition of one embodiment may include UC-102M (Kuraray company), UC-203M (Kuraray company), TEAI-1000 (Nippon Soda Co., Ltd.), or a mixture thereof as the polymer (B).

[0067] The resin composition of one embodiment may contain a polymer (B) in an amount of 5% by weight or more and 30% by weight or less, based on 100% by weight of the total resin composition. The resin composition of one embodiment contains (meth)acrylate (A) in an amount of 0.1% by weight or more and 5% by weight or less, so that in the resin state, it exhibits low viscosity characteristics of 5 mPa·s or more and 50 mPa·s or less, and after photocuring, it may have a glass transition temperature of -50°C or more and 0°C or less. As the resin composition of one embodiment contains a polymer (B) in an amount of 0.1% by weight or more and 5% by weight or less, the adhesive member formed by curing the resin composition of one embodiment may have high adhesion to polyethylene terephthalate film and glass, and may have flexibility to be applicable to a folding device.

[0068] The resin composition of one embodiment may further include a monofunctional (meth)acrylate (C). The resin composition of one embodiment may further include a monofunctional (meth)acrylate (C) different from the (meth)acrylate (A) and the polymer (B).

[0069] Monofunctional (meth)acrylate (C) refers to a (meth)acrylate having one functional group. Specifically, monofunctional (meth)acrylate (C) refers to a (meth)acrylate containing one (meth)acryloyl group within a molecule. In the resin composition of one embodiment, the monofunctional (meth)acrylate (C) may comprise a plurality of different (meth)acrylates. For example, in the resin composition of one embodiment, the monofunctional (meth)acrylate (C) may comprise at least one monofunctional acrylate and at least one monofunctional methacrylate.

[0070] Monofunctional (meth)acrylates (C) are, for example, phenoxyethyl (meth)acrylate, phenoxyethoxyethyl (meth)acrylate, phenoxyhydroxypropyl (meth)acrylate, phenylphenoxyethyl (meth)acrylate, bromophenoxyethyl (meth)acrylate, polyoxyethylene nonylphenyl ether (meth)acrylate, isobornyl (meth)acrylate, adamantyl (meth)acrylate, methyladamanthyl (meth)acrylate, ethyladamanthyl (meth)acrylate, bornyl (meth)acrylate, tricyclodecanyl (meth)acrylate, dicyclofentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, cyclohexyl (meth)acrylate, butylcyclohexyl (Meth)acrylate, Methyl (Meth)acrylate, Ethyl (Meth)acrylate, Propyl (Meth)acrylate, Isopropyl (Meth)acrylate, Butyl (Meth)acrylate, Amyl (Meth)acrylate, Isobutyl (Meth)acrylate, t-Butyl (Meth)acrylate, Pentyl (Meth)acrylate, Hexyl (Meth)acrylate, Heptyl (Meth)acrylate, Octyl (Meth)acrylate, Isooctyl (Meth)acrylate, Ethylhexyl (Meth)acrylate, Nonyl (Meth)acrylate, Decyl (Meth)acrylate, Isodecyl (Meth)acrylate, Undecyl (Meth)acrylate, Dodecyl (Meth)acrylate, Lauryl (Meth)acrylate, It may include stearyl (meth)acrylate, isostearyl (meth)acrylate, benzyl (meth)acrylate, ethoxydiethylene glycol (meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, methoxyethylene glycol (meth)acrylate, ethoxyethyl (meth)acrylate, or a mixture thereof. In the resin composition of one embodiment, the monofunctional (meth)acrylate (C) may include at least one of isodecyl acrylate and 2-methyl-2-ethyl-1,3-dioxolane-4-yl methylacrylate.Monofunctional (meth)acrylate (C) may include at least one of isodecyl acrylate and Medol-10 (Osaka Organic Chemical Industry Ltd.).

[0071] The resin composition of one embodiment may contain monofunctional (meth)acrylate (C) in an amount of 50% by weight or more and 88% by weight or less, based on 100% by weight of the total resin composition. The resin composition of one embodiment contains monofunctional (meth)acrylate (C) in an amount of 50% by weight or more and 88% by weight or less, and in the resin state, exhibits low viscosity characteristics of 5 mPa·s or more and 50 mPa·s or less, and after photocuring, may have a glass transition temperature of -50°C or more and 0°C or less. As the resin composition of one embodiment contains monofunctional (meth)acrylate (C) in an amount of 50% by weight or more and 88% by weight or less, the adhesive member formed by curing the resin composition of one embodiment may have high adhesion to polyethylene terephthalate film and glass, and may have flexibility to be applicable to a folding device.

[0072] The resin composition of one embodiment may further include a urethane (meth)acrylate oligomer (D). The urethane (meth)acrylate oligomer (D) may have a weight average molecular weight (Mw) of 6,000 or more. In the resin composition of one embodiment, the weight average molecular weight of the urethane (meth)acrylate oligomer (D) may be 27,000 or more and 50,000 or less.

[0073] In one embodiment, the urethane (meth)acrylate oligomer (D) may comprise a photocurable compound comprising at least one (meth)acryloyl group having a urethane bond. The urethane (meth)acrylate oligomer (D) may comprise at least one of an acrylate having a urethane bond, a urethane acrylate having a polycarbonate backbone, and a urethane acrylate having a polyether backbone. For example, the resin composition of one embodiment may comprise at least one of UF-C051 (Kyoeisha Chemical Co., Ltd.) and UN7700 (Negami Chemical Industrial) as the urethane acrylate oligomer.

[0074] A resin composition containing a urethane (meth)acrylate oligomer (D) with a weight average molecular weight of 6,000 or more can exhibit low viscosity characteristics that allow it to be applied by methods such as inkjet printing or dispensing. Additionally, the urethane (meth)acrylate oligomer (D) with a weight average molecular weight of 6,000 or more is included in the resin composition in an oligomer state having a relatively high degree of polymerization, and by maintaining a high degree of polymerization even after photocuring, it can exhibit a low storage modulus (G') value and high peel strength characteristics.

[0075] The resin composition of one embodiment may contain urethane (meth)acrylate oligomer (D) in an amount of 1% by weight or more and 15% by weight or less, based on 100% by weight of the total resin composition. The resin composition of one embodiment contains urethane (meth)acrylate oligomer (D) with a weight average molecular weight of 6,000 or more in an amount of 1% by weight or more and 15% by weight or less, and in the resin state, it exhibits low viscosity characteristics of 5 mPa·s or more and 50 mPa·s or less, and after photocuring, it may have a glass transition temperature of -50°C or more and 0°C or less, and accordingly, when an adhesive member formed with the resin composition of one embodiment is applied to a foldable display device, the folding characteristics of the display device may be improved.

[0076] The resin composition of one embodiment may further comprise at least one photoinitiator. When a plurality of photoinitiators are included, the different photoinitiators may be activated by ultraviolet light of different center wavelengths.

[0077] The photoinitiator is 2,2-dimethoxy-1,2-diphenylethan-1-one (2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methyl-1-propanone, and It may be any one selected from 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]-phenyl}-2-methylpropan-1-one(2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]-phenyl}-2-methylpropan-1-one).

[0078] In addition, the photoinitiator is 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1, 2-dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)-butan-1-one, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenyl phosphinate, bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide, [1-(4-phenylsulfanylbenzoyl)heptylideneamino]benzoate, [1-[9-ethyl-6-(2-methylbenzoyl)carbazol-3-yl]ethylideneamino] acetate, and bis(2,4-cyclopentadienyl)bis[2,6-difluoro-3-(1-pyryl)phenyl] It may be any one selected from titanium(IV) (Bis(2,4-cyclopentadienyl)bis[2,6-difluoro-3-(1-pyrryl)phenyl] titanium(IV)).The resin composition of one embodiment may include at least one of Omnirad TPO-H (IGM Resins), Omnirad 819 (IGM Resins), and Esacure 3644 (IGM Resins) as a photoinitiator.

[0079] The resin composition of one embodiment may further include other additives such as a curing accelerator. The curing accelerator may include a polyfunctional amine acrylate and may promote the photocuring reaction of the resin composition of one embodiment. For example, the resin composition of one embodiment may include Photomer 4250 (IGM) as a curing accelerator.

[0080] The resin composition of one embodiment may not include a separate organic solvent. Alternatively, the resin composition of one embodiment may include an organic solvent, but the organic solvent may be included in an amount of 1 weight% or less based on 100 weight% of the total resin composition. By not including an organic solvent or including an organic solvent in an amount of 1 weight% or less, the processability of the resin composition can be improved, and costs can be reduced when forming an adhesive member using the resin composition of one embodiment.

[0081] In order to apply an adhesive member formed through a resin composition to a flexible display device, the flexibility of the adhesive member must be ensured. To this end, plasticizers have been used in conventional resin compositions; however, plasticizers often cause reduced durability at high temperatures after UV curing, as well as curing defects and cloudiness due to layer separation. Furthermore, since most plasticizers are high-molecular-weight polymer compounds, they increase the viscosity of the resin composition, making it impossible to provide the resin composition through processes such as inkjet manufacturing. Although the use of organic solvents is essential for applying resin compositions containing plasticizers to inkjet processes, the use of organic solvents leads to problems such as difficulties in processing, including the removal of the solvent after curing.

[0082] The resin composition of one embodiment can form an adhesive member that has high flexibility without the use of plasticizers and organic solvents and has high stability under low and high temperature conditions, and has excellent processability in the resin composition state, so that an adhesive member applied to a flexible display device can be formed through an inkjet process, etc.

[0083] The resin composition of one embodiment may have a viscosity of 5 mPa·s or more and 50 mPa·s or less at a temperature of 20°C or higher and 30°C or lower. For example, the resin composition of one embodiment may have a viscosity of 5 mPa·s or more and 50 mPa·s or less at 25°C. The viscosity of the resin composition may be measured by the JIS K 2283 method.

[0084] If the viscosity of the resin composition of one embodiment is less than 5 mPa·s in the range of 20°C to 30°C, the low viscosity causes flow of the resin composition liquid provided for forming an adhesive member, and consequently, it may be difficult to form a coating film of uniform thickness using the resin composition. In addition, if the viscosity of the resin composition of one embodiment exceeds 50 mPa·s in the range of 20°C to 30°C, it may be difficult to discharge an appropriate amount of the resin composition from the coating device used to apply the resin composition.

[0085] The liquid resin composition is cured by ultraviolet irradiation and can be formed into a film or thin film after ultraviolet curing. After the resin composition of one embodiment is cured by ultraviolet, the 180° peel strength for a glass substrate or polyethylene terephthalate (PET) film may be 1000 gf / 25 mm or more.

[0086] A resin composition cured by UV irradiation may have a low glass transition temperature. In one embodiment, the glass transition temperature after UV curing may be between -50°C and 0°C. If the glass transition temperature after UV curing of the resin composition in one embodiment exceeds 0°C, the durability and flexibility of the resin composition cured under low temperature conditions may be reduced.

[0087] A display panel (DP) may include a base substrate (BS), a circuit layer (DP-CL) disposed on the base substrate (BS), a display element layer (DP-EL) disposed on the circuit layer (DP-CL), and an encapsulation layer (TFE) covering the display element layer (DP-EL). For example, the display panel (DP) may include a plurality of organic light-emitting elements or a plurality of quantum dot light-emitting elements in the display element layer (DP-EL).

[0088] Meanwhile, the configuration of the display panel (DP) presented in FIG. 7, etc. is exemplary and is not limited to that shown in FIG. 7, etc. For example, the display panel (DP) may include a liquid crystal display element, in which case the encapsulation layer (TFE) may be omitted.

[0089] An input detection unit (TP) may be disposed on a display panel (DP). For example, the input detection unit (TP) may be disposed directly on the encapsulation layer (TFE) of the display panel (DP). The input detection unit (TP) may detect an external input, convert it into a predetermined input signal, and provide the input signal to the display panel (DP). For example, in a display device (DD) of one embodiment, the input detection unit (TP) may be a touch detection unit that detects a touch. The input detection unit (TP) may recognize a direct touch by a user, an indirect touch by a user, a direct touch by an object, or an indirect touch by an object. Meanwhile, the input detection unit (TP) may detect at least one of the location of a touch applied from the outside and the intensity (pressure) of the touch. The input detection unit (TP) in one embodiment of the present invention may have various structures or be composed of various materials and is not limited to any one embodiment. The input detection unit (TP) may include a plurality of detection electrodes (not shown) for detecting external input. The sensing electrodes (not shown) can detect external input in a capacitive manner. The display panel (DP) receives an input signal from the input sensing unit (TP) and can generate an image corresponding to the input signal.

[0090] The window (WP) may protect the display panel (DP) and the input detection unit (TP), etc. An image (IM) generated from the display panel (DP) may be provided to the user by passing through the window (WP). The window (WP) may provide a touch surface of the display device (DD). In the display device (DD) including a folding area (FA), the window (WP) may be a flexible window.

[0091] The window (WP) may include a base layer (BL) and a printing layer (BM). The window (WP) may include a transparent area (TA) and a bezel area (BZA). The front surface of the window (WP) including the transparent area (TA) and the bezel area (BZA) corresponds to the front surface of the display device (DD).

[0092] The transmission region (TA) may be an optically transparent region. The bezel region (BZA) may be a region with a relatively lower light transmittance compared to the transmission region (TA). The bezel region (BZA) may have a predetermined color. The bezel region (BZA) may be adjacent to the transmission region (TA) and may surround the transmission region (TA). The bezel region (BZA) may define the shape of the transmission region (TA). However, the embodiments are not limited to those illustrated, and the bezel region (BZA) may be positioned adjacent to only one side of the transmission region (TA), or a part of it may be omitted.

[0093] The base layer (BL) may be a glass or plastic substrate. For example, the base layer (BL) may be a reinforced glass substrate. Alternatively, the base layer (BL) may be formed from a flexible polymer resin. For example, the base layer (BL) may be made of polyimide, polyacrylate, polymethylmethacrylate, polycarbonate, polyethylenenaphthalate, polyvinylidene chloride, polyvinylidene difluoride, polystyrene, ethylene vinylalcohol copolymer, or a combination thereof. However, the embodiments are not limited thereto, and any general form known in the art as a base layer (BL) of a window (WP) may be used without limitation.

[0094] A printed layer (BM) may be disposed on one side of a base layer (BL). In one embodiment, the printed layer (BM) may be provided on the lower surface of the base layer (BL) adjacent to a display module (DM). The printed layer (BM) may be disposed in an edge region of the base layer (BL). The printed layer (BM) may be an ink printed layer. Additionally, the printed layer (BM) may be a layer formed by including a pigment or a dye. In the window (WP), the bezel region (BZA) may be the portion where the printed layer (BM) is provided.

[0095] Meanwhile, the window (WP) may further include at least one functional layer (not shown) provided on the base layer (BL). For example, the functional layer (not shown) may be a hard coating layer, an anti-fingerprint coating layer, etc., but the embodiments are not limited thereto.

[0096] There may be a step difference between the portion where the printed layer (BM) is provided and the base layer (BL) where it is not provided. The adhesive member (AP) of one embodiment formed from the resin composition of the above-described embodiment has a low storage modulus and a high adhesive strength value, so it can be attached to the window (WP) without lifting at the step difference portion.

[0097] An adhesive member (AP) according to one embodiment may comprise a polymer derived from the resin composition of the above-described embodiment. That is, the adhesive member (AP) of one embodiment may comprise a (meth)acrylate (A) having a hydroxyl group and a molecular weight of 500 or less, and a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and a molecular weight of 35,000 or less. The adhesive member (AP) of one embodiment may comprise a polymer derived from a resin composition comprising (meth)acrylate (A) and polymer (B), and further comprising monofunctional (meth)acrylate (C), urethane (meth)acrylate oligomer (D), and a photoinitiator. With respect to (meth)acrylate (A), polymer (B), monofunctional (meth)acrylate (C), urethane (meth)acrylate oligomer (D), and photoinitiator, the same details as those described in the resin composition of the above-described embodiment may apply.

[0098] A resin composition that forms an adhesive member (AP) through a polymerization reaction by a photoinitiator may have a viscosity of 5 mPa·s or more and 50 mPa·s or less at a temperature of 20°C or higher and 30°C or lower, as measured by the JIS K 2283 method. In addition, the glass transition temperature of the adhesive member (AP) of one embodiment may be -50°C or higher and 0°C or lower.

[0099] Meanwhile, the 180° peel strength of the adhesive member (AP) on a glass substrate or polyethylene terephthalate (PET) film may be 1000 gf / 25mm or more.

[0100] An adhesive member (AP) according to one embodiment has high flexibility and adhesive properties, and can have high stability and durability under low temperature and high temperature conditions, respectively. Accordingly, the adhesive member (AP) according to one embodiment can be applied to a flexible display device to secure excellent folding properties.

[0101] An adhesive member (AP) included in a display device (DD) of one embodiment may be provided on one side of a window (WP) or one side of a display module (DM) in the state of a liquid resin composition, and may be formed by UV curing of the liquid resin composition provided between the window (WP) and the display module (DM). Alternatively, the adhesive member (AP) may be provided by forming the adhesive member (AP) by UV curing the liquid resin composition in a separate process, laminating one side of the adhesive member (AP) in a cured state in the form of an adhesive film onto one side of the window (WP) or one side of the display module (DM), and attaching the one side of the window (WP) or one side of the display module (DM) that is not attached to the other side of the adhesive member (AP).

[0102] The thickness of the adhesive member (AP) may be 50 µm or more and 200 µm or less. For example, the adhesive member (AP) may have a thickness of 100 µm or more and 150 µm or less.

[0103] FIGS. 8a to 8c are schematic diagrams illustrating the steps of manufacturing an adhesive member (AP) according to one embodiment. FIG. 8a shows the step of providing a resin composition (RC) for forming the adhesive member (AP), FIG. 8b shows the step of irradiating with ultraviolet light, and FIG. 8c shows the step of removing a carrier film (CF).

[0104] Referring to FIGS. 8a to 8c, a resin composition (RC) of one embodiment may be provided on a carrier film (CF). For example, a polyethylene terephthalate (PET) film may be used as the carrier film (CF), but the embodiment is not limited thereto. The carrier film (CF) serves as a substrate for coating the liquid resin composition (RC) and may be used without limitation as long as it can be easily detached from the adhesive member (AP) after UV curing. For example, one side of the carrier film (CF) on which the resin composition (RC) is provided may have a release treatment.

[0105] The resin composition (RC) can be provided by methods such as inkjet printing or dispensing. The resin composition (RC) of one embodiment can be easily discharged from a nozzle (NZ), etc., by having a viscosity value of 5 mPa·s or more and 50 mPa·s or less at a temperature of 20°C or higher and 30°C or lower, and can be provided so as to maintain a constant coating thickness. Specifically, the resin composition (RC) of one embodiment can have a viscosity value of 5 mPa·s or more and 50 mPa·s or less at 25°C.

[0106] Ultraviolet light (UV) can be irradiated onto a pre-adhesive member (P-AP) provided by coating a resin composition (RC) to a uniform thickness. Although FIG. 8b illustrates that ultraviolet light (UV) is directly irradiated onto the coated pre-adhesive member (P-AP), the embodiment is not limited thereto. An auxiliary carrier film (not shown) may be further disposed on the pre-adhesive member (P-AP), and the auxiliary carrier film (not shown) may transmit ultraviolet light and cover the pre-adhesive member (P-AP) during the UV curing process.

[0107] An adhesive member (AP) can be formed after UV curing. The adhesive member (AP) finally provided by removing the carrier film (CF) used during the process may have a glass transition temperature of -50°C or higher and 0°C or lower, and a 180° peel strength of 1000 gf / 25mm or higher for a glass substrate or polyethylene terephthalate (PET) film.

[0108] The adhesive member (AP) produced in the steps of FIGS. 8a to 8c can be applied to the display device (DD) described above. For example, one side of the adhesive member (AP) may be attached to a display module (DM), and then a window (WP) may be sequentially attached to the other side of the adhesive member (AP) facing the side of the adhesive member (AP) attached to the display module (DM). Alternatively, the adhesive member (AP) may be provided to the display device (DD) by attaching one side of the adhesive member (AP) to the side of the window (WP) facing the display module (DM), and then attaching the other side of the adhesive member (AP) facing the side of the adhesive member (AP) attached to the window (WP) to the display module (DM).

[0109] Meanwhile, a resin composition provided in liquid form between the display module (DM) and the window (WP) can be cured to form an adhesive member (AP). FIGS. 9a and 9b show the manufacturing steps of an adhesive member (AP) included in a display device (DD) that is manufactured in a different way from the method of manufacturing an adhesive member (AP) described with reference to FIGS. 8a to 8c.

[0110] FIG. 9a illustrates the step of providing a resin composition (RC) onto a display module (DM). FIG. 9b illustrates the step of irradiating ultraviolet light onto a pre-adhesive member (P-AP) formed from the resin composition (RC).

[0111] The resin composition (RC) can be provided by methods such as inkjet printing or dispensing. The resin composition (RC) of one embodiment has a viscosity value of 5 mPa·s or more and 50 mPa·s or less at 25°C, so that it can be easily discharged from a nozzle (NZ), etc., and can be provided to maintain a thin yet uniform coating thickness. In addition, the resin composition has a viscosity value of 5 mPa·s or more and 50 mPa·s or less, so that it can be provided to cover the curvature of the stepped portion (SP-a) of the display module (DM). That is, by having a low viscosity value of 50 mPa·s or less, the resin composition (RC) can be filled without any empty space in the curved portion, such as the stepped portion (SP-a). In addition, the resin composition (RC) provided through the nozzle (NZ) has a viscosity value of 5 mPa·s or more, so that it can be uniformly coated to a predetermined thickness without flowing away from the display module (DM).

[0112] A window (WP) can be provided on a pre-adhesive member (P-AP) provided by coating a resin composition (RC) to a uniform thickness. Ultraviolet light (UV) for curing the resin composition (RC) can be provided by passing through the window (WP). When the window (WP) is provided on the pre-adhesive member (P-AP), the resin composition (RC) can be filled without any empty space in the stepped portion (SP-b). That is, by having a low viscosity value of 50 mPa·s or less for the resin composition (RC), the pre-adhesive member (P-AP) can be provided while covering the shape of the curve in a curved portion, such as the stepped portion (SP-a) between the base layer (BL) and the printing layer (BM). The pre-adhesive member (P-AP) can be formed into an adhesive member (AP) by polymerizing and curing by the provided ultraviolet light (UV).

[0113] Meanwhile, unlike as illustrated in FIG. 9b, ultraviolet light (UV) may be provided to the preliminary adhesive member (P-AP) before the window (WP) is provided on the preliminary adhesive member (P-AP) to allow the polymerization reaction in the resin composition (RC) to proceed. The amount of ultraviolet light (UV) irradiated may be sufficient to completely cure the resin composition (RC). However, alternatively, the polymerization reaction of the resin composition (RC) may be partially carried out in the preliminary adhesive member (P-AP) state, and then the unreacted resin composition (RC) may be further reacted after the window (WP) is covered to form the final adhesive member (AP).

[0114] A display device (DD, DD-a, DD-b) according to an embodiment illustrated in FIGS. 1 to 5 includes an adhesive member (AP) comprising a polymer derived from the resin composition of the above-described embodiment, so that the adhesive state between the window (WP) and the display module (DM) can be maintained using the adhesive member (AP) without the adhesive member (AP) lifting up even in a folding state or a bending region.

[0115] FIG. 10 is a cross-sectional view showing a display device according to one embodiment. In the following description of the display device of one embodiment shown in FIG. 10, details that overlap with those described above with reference to FIG. 1 to FIG. 9b will not be explained again, and the differences will be explained in detail.

[0116] Compared to the display device (DD) described with reference to FIG. 6 and FIG. 7, the display device (DD-1) of one embodiment illustrated in FIG. 10 may further include a light control layer (PP) and an optical adhesive layer (AP-a). The display device (DD-1) of one embodiment may further include a light control layer (PP) disposed between an adhesive member (AP) and a window (WP), and an optical adhesive layer (AP-a) disposed between the light control layer (PP) and a window (WP).

[0117] The light control layer (PP) is disposed on the display panel (DP) and can control reflected light from the display panel (DP) caused by external light. The light control layer (PP) may, for example, include a polarizing layer or a color filter layer.

[0118] The optical adhesive layer (AP-a) may be an optically clear adhesive film (OCA) or an optically clear adhesive resin layer (OCR). The optical adhesive layer (AP-a) may be formed from a resin composition of one embodiment, in the same way as the adhesive member (AP, FIG. 7) of one embodiment described above. That is, the optical adhesive layer (AP-a) may comprise a polymer derived from a resin composition comprising (meth)acrylate (A), a polymer (B), a monofunctional (meth)acrylate (C), a urethane (meth)acrylate oligomer (D), and a photoinitiator.

[0119] The resin composition forming the optical adhesive layer (AP-a) through a polymerization reaction by a photoinitiator may have a viscosity of 5 mPa·s or more and 50 mPa·s or less at a temperature of 20°C or higher and 30°C or lower, as measured by the JIS K 2283 method. In addition, the glass transition temperature of the optical adhesive layer (AP-a) of one embodiment may be -50°C or higher and 0°C or lower. The optical adhesive layer (AP-a) according to one embodiment may have a low glass transition temperature value in the range of -50°C or higher and 0°C or lower.

[0120] Meanwhile, the 180° peel strength of the optical adhesive layer (AP-a) on a glass substrate or polyethylene terephthalate (PET) film may be 1000 gf / 25mm or more.

[0121] An optical adhesive layer (AP-a) according to one embodiment has high flexibility and adhesive properties, and can have high stability and durability under low and high temperature conditions, respectively. Accordingly, the optical adhesive layer (AP-a) according to one embodiment is applied to a flexible display device to secure excellent folding properties.

[0122] A display device (DD-1) of one embodiment includes an optical adhesive layer (AP-a) and an adhesive member (AP) formed from a resin composition of one embodiment. The optical adhesive layer (AP-a) and the adhesive member (AP) have a low glass transition temperature, high flexibility and adhesive properties, and high stability and durability under low and high temperature conditions, respectively. As a result, even when the display device (DD-1) is in a folding or bending operation state, no lifting phenomenon occurs at the interface between the optical adhesive layer (AP-a) and the adhesive member (AP), thereby exhibiting excellent reliability characteristics.

[0123] FIG. 11 is a cross-sectional view showing a display device according to one embodiment. In the following description of the display device of one embodiment shown in FIG. 11, details that overlap with those described above with reference to FIG. 1 to FIG. 10 will not be explained again, and the differences will be explained in detail.

[0124] Compared to the display device (DD) described with reference to FIG. 6 and FIG. 7, the display device (DD-2) of one embodiment shown in FIG. 11 may further include a light control layer (PP), an optical adhesive layer (AP-a), and an interlayer adhesive layer (PIB). The display device (DD-2) of one embodiment may further include a light control layer (PP) disposed between an adhesive member (AP) and a window (WP), and an optical adhesive layer (AP-a) disposed between the light control layer (PP) and the window (WP), as in the display device (DD-1) of one embodiment shown in FIG. 10.

[0125] In one embodiment, the display device (DD-2) may have an adhesive member (AP) provided between the display panel (DP) and the input sensing unit (TP). That is, the input sensing unit (TP) may not be placed directly on the display panel (DP), but the display panel (DP) and the input sensing unit (TP) may be joined to each other by the adhesive member (AP). For example, the adhesive member (AP) may be placed between the encapsulation layer (TFE, FIG. 7) of the display panel (DP) and the input sensing unit (TP).

[0126] An interlayer adhesive layer (PIB) may be provided on the lower side of the light control layer (PP). The interlayer adhesive layer (PIB) is positioned between the input sensing unit (TP) and the light control layer (PP) and may be formed of an adhesive material with excellent moisture-proof properties. For example, the interlayer adhesive layer (PIB) may be formed by including polyisobutylene. The interlayer adhesive layer (PIB) is positioned on the input sensing unit (TP) to prevent corrosion of the sensing electrodes of the input sensing unit (TP).

[0127] A display device (DD-2) of one embodiment includes an optical adhesive layer (AP-a) and an adhesive member (AP) formed from a resin composition of one embodiment, and the optical adhesive layer (AP-a) and the adhesive member (AP) exhibit a low storage modulus value and a high elastic recovery force, so that even when the display device (DD-2) is in a folding or bending operation state, no lifting phenomenon occurs at the interface between the optical adhesive layer (AP-a) and the adhesive member (AP), thereby exhibiting excellent reliability characteristics.

[0128] Hereinafter, a resin composition, an adhesive member, and a display device of one embodiment according to one embodiment of the present invention will be described in detail with reference to examples and comparative examples. Furthermore, the examples described below are illustrative examples to aid in understanding the present invention, and the scope of the present invention is not limited thereto.

[0129] [Example]

[0130] 1. Preparation of a curable liquid resin composition

[0131] The resin composition of the example was prepared according to the formulation ratios listed in Table 1. The resin composition of the comparative example was prepared according to the formulation ratios listed in Table 2. After providing the constituent materials of the example and comparative example to a heat-resistant light-shielding container in the weight ratios disclosed in Tables 1 and 2, Omnirad TPO-H, Esacure 3644, Omnirad 819, and Photomer 4250 were mixed in a weight ratio of 60:10:30:1 as a photoinitiator and curing accelerator, and provided in an amount of 2% by weight based on 100% by weight of the total resin composition. Subsequently, the provided materials were stirred at 1000 rpm for 30 minutes at room temperature using a self-rotating stirring degassing device (manufactured by SHASHIN KAGAKU CO., LTD.) to obtain a curable resin composition.

[0132] ingredient (Meta)acrylate(A) Polymer (B) Monofunctional (meth)acrylate(C) Urethane (meth)acrylate oligomer (D) organic solvents 4-HBA 3-HPA HEA UC-102M UC-203M TEAI-1000 IDAA Medol-10 UF-C051 MEK ethanol molecular weight 144 130 116 17000 35000 2000 212 200 35000 72 46 Example 1 10 - - 0.1 - - 65 15 9.9 - - Example 2 10 - - 5 - - 65 15 5 - - Example 3 5 - - - 1 - 70 15 9 - - Example 4 30 - - - 1 - 50 10 9 - - Example 5 - 10 - - - 1 60 15 14 - - Example 6 - - 10 - - 5 69 15 1 - - Example 7 10 - - - 2 2 65 15 6 - - Example 8 - 5 5 1 - - 65 15 9 - - Example 9 10 - - 0.1 - - 65 15 9.9 1 - Example 10 10 - - 0.1 - - 65 15 9.9 - 1 Example 11 10 - - 0.1 - - 65 15 9.9 - -

[0133] ingredient (Meta)acrylate(A) Polymer (B) Monofunctional (meth)acrylate(C) Urethane (meth)acrylate oligomer (D) Oil gelling agent organic solvents 4-HBA HEA UC-102M UC-203M TEAI-1000 IDAA Medol-10 FA-512AS IBXA LA UF-C051 UN7700 HSA MED ethanol acetone molecular weight 144 116 17000 35000 2000 212 200 248 208 240 35000 20000 300 72 46 58 Comparative Example 1 10 - - - - 65 15 - - - 10 - - - - - Comparative Example 2 10 - 10 - - 55 15 - - - 10 - - - - - Comparative Example 3 10 - - 1 - 35 45 - - - 9 - - - - - Comparative Example 4 10 - - - 1 80 - - - - 9 - - - - - Comparative Example 5 - 10 - - 1 88 - - - - 9 - - - - - Comparative Example 6 10 - - 5 - 55 10 - - - 20 - - - - - Comparative Example 7 - - 0.1 - - 75 15 - - - 9.9 - - - - - Comparative Example 8 50 - 0.1 - - 25 15 - - - 9.9 - - - - - Comparative Example 9 5 - 55 - - - - - - 10 30 - - - - - Comparative Example 10 - - 5 - - 45 - - - - 50 - - - - - Comparative Example 11 20 - - - - - - - 40 20 - 20 - - - - Comparative Example 12 10 - 0.1 - - 60 15 - - - 9.9 - 5 - - - Comparative Example 13 10 - 0.1 - - 64 15 - - - 9.9 - 1 - - - Comparative Example 14 - - - 30 - - - 69 - - - - 1 - - - Comparative Example 15 - - - 80 - - - 19 - - - - 1 - - - Comparative Example 16 1 - - - - 65 15 - - - 10 - - 2 - - Comparative Example 17 1 - - - - 65 15 - - - 10 - - 10 - - Comparative Example 18 1 - - - - 65 15 - - - 10 - - - 10 - Comparative Example 19 1 - - - - 65 15 - - - 10 - - - - 10

[0135] <Data on materials used as components in the Examples and Comparative Examples>

[0136] The data for each component used in the examples and comparative examples disclosed in Tables 1 and 2 above are as follows.

[0137] 4-HBA: 4-hydroxybutyl acrylate

[0138] 3-HPA: 3-hydroxypropyl acrylate

[0139] HEA: Hydroxyethyl Acrylate

[0140] UC-102M: Polyisoprene compound having radical curable groups (Kuraray company)

[0141] UC-203M: Polyisoprene compound having radical curable groups (Kuraray company)

[0142] TEAI-1000: Polybutadiene compound having radical curable groups (Nippon Soda Co., Ltd.)

[0143] IDAA: Isodecyl acrylate

[0144] Medol-10: 2-methyl-2-ethyl-1,3-dioxolane-4-ylmethylacrylate (Osaka Organic Chemical Industry Ltd.)

[0145] IBXA: Isobornyl acrylate

[0146] FA-512AS: Dicyclopentenyloxyethyl acrylate

[0147] LA: Lauryl Acrylate

[0148] UF-C051: Urethane Acrylate (Kyoeisha Chemical Co., Ltd.)

[0149] UN7700: Urethane Acrylate (Negami Chemical Industrial)

[0150] HSA: 12-hydroxy stearic acid

[0151] MEK: Methyl ethyl ketone

[0153] 1. Evaluation of physical properties of resin composition and adhesive member formed from resin composition

[0154] Table 3 below presents the measured viscosity and inkjet printer coating characteristics of resin compositions having the composition ratios of Tables 1 and 2 above, as well as the glass transition temperature, curing characteristics, 180° peel strength, high-temperature durability, low-temperature durability, and flexural adhesion of the cured product formed by curing these resin compositions. The viscosity, inkjet printer coating characteristics, glass transition temperature, curing characteristics, 180° peel strength, high-temperature durability, low-temperature durability, and flexural adhesion of the resin compositions were measured by the following methods.

[0155] [Viscosity Measurement Method]

[0156] The viscosity of the resin composition described in this specification was measured at 25°C using the JIS K 2283 method, and the viscosity of the liquid photocurable resin composition was measured at a speed of 10 rpm using a viscometer (TVE-25L: manufactured by Toki Sangyo Co., Ltd.).

[0157] [Measurement of Glass Transition Temperature of Cured Material]

[0158] Using the curable resin compositions prepared in the examples and comparative examples, 4000 mJ / cm² was measured using a metal halide lamp (a conveyor-type UV irradiation device manufactured by iGraphics). 2 The glass transition temperature (Tg) of the obtained resin cured product (size: diameter 8 mm, thickness 0.5 mm) was measured using a dynamic viscoelasticity measuring device (Anton Paar MCR302) by irradiating with ultraviolet light to achieve an integrated amount of light. The measurement conditions were set as follows: frequency 1 Hz, temperature range -70 to 80°C, and heating rate 10°C / min.

[0159] [Evaluation of Curing Properties]

[0160] Using the curable resin composition prepared in the examples and comparative examples, a polyethylene terephthalate film (Toyo Spinning Co., Ltd., product name [Cosmo Shine 4100], thickness 100 μm) and a slide glass (Matsunami Glass Industry Co., Ltd., product name [S1112]) were laminated so that the thickness of the curable resin composition was 100 μm. After lamination, a metal halide lamp (I-Graphics Co., Ltd., conveyor-type UV irradiation device) was applied to the slide glass side at 4000 mJ / cm² 2 A laminate was obtained by curing a curable resin composition by irradiating it with ultraviolet light to achieve an accumulated amount of light. The appearance of the laminate obtained above was observed, and a result without cloudiness or curing defects was evaluated as "good," and a result with at least one of cloudiness or curing defects was evaluated as "poor."

[0161] [Evaluation of Inkjet Printer Coating Characteristics]

[0162] Using the curable resin compositions prepared in the examples and comparative examples, coating and UV curing were performed using an inkjet printer from MICROJET, and the appearance of the coating film after curing was observed. As a result of the observation, coating was evaluated as "good" if coating was possible and there was no thickness variation, as "poor" if coating was possible but thickness variation occurred, and as "uncoating possible" if coating was not possible.

[0163] [180° Peel Strength Measurement]

[0164] Using the curable resin composition prepared in the examples and comparative examples, the curable resin composition was applied onto a slide glass (Matsunami Glass Industry Co., Ltd., product name [S1112]) to a thickness of 100 μm. Subsequently, using a UV-LED having a wavelength peak in the range of 365 ± 5 nm, an intensity of 100 mW / cm² was applied. 2 A UV-cured layer was prepared by irradiating with ultraviolet light for 2 seconds. A polyimide film (Toray-DuPont product, product name [Kapton], thickness 75 μm) and a slide glass (Matsunami Glass Industry Co., Ltd. product name [S1112]) were laminated onto the prepared UV-cured layer, and the process was carried out for 5 minutes at 30°C and 0.5 MPa using an automatic heating and pressurizing treatment device (Chiyoda Electronics Co., Ltd. product name [ACS-230]). Afterward, a laminate was obtained by irradiating with ultraviolet light of an intensity of 500 mW / cm2 for 4 seconds using a UV-LED having a wavelength peak in the range of 395 ± 5 nm. Using the laminate, a 180° peel test was performed using a tensile testing machine (INSTRON 5965 model). The measurement conditions were 25°C and a tensile speed of 300 mm / min.

[0165] [High Temperature Durability Measurement]

[0166] A laminate of polyimide film / cured resin / slide glass was obtained using the same method as measuring 180° peel strength. The laminate obtained above was maintained in a high temperature or high temperature and high humidity (e.g., 85°C, 85%RH) environment for 72 hours to observe the occurrence of lifting and delamination at the interface with the substrate. As a result of the observation, cases where there was no change in appearance were evaluated as "good," and cases where lifting and delamination occurred were evaluated as "poor."

[0167] [Low-temperature durability measurement]

[0168] A laminate of polyimide film / cured resin / slide glass was obtained using the same method as measuring 180° peel strength. The laminate obtained above was maintained in a low-temperature (-20°C) environment for 72 hours to observe the occurrence of lifting and delamination at the interface with the substrate. As a result of the observation, cases where there was no change in appearance were evaluated as "good," and cases where lifting and delamination occurred were evaluated as "poor."

[0169] [Flexibility Adhesion Test]

[0170] Under conditions of 23°C and 50%RH, the formulations prepared in the examples and comparative examples were applied to one side of a polyethylene terephthalate film (thickness: 100μm), and a photoreaction was carried out by inserting them into another polyethylene terephthalate film (thickness: 100μm) and irradiating them with ultraviolet light with an integrated light intensity of 1000mJ / cm2. The thickness of the laminate was measured and adjusted so that the thickness of the adhesive layer was 100μm. Afterward, it was left for 24 hours under conditions of 23°C and 50%RH. The laminate obtained in this way, consisting of a PET film / adhesive layer / PET film, was cut to a width of 50mm and a length of 200mm, and this was used as a sample.

[0171] The obtained sample was subjected to repeated bending 30,000 times with a bending diameter of 3 mm at a test temperature of 23°C using a durability tester (product of Yuasa System Equipment Co., Ltd., product name [U-shaped stretch tester for unloaded planar body]). Afterward, the presence or absence of lifting or delamination at the interface between the adhesive layer and the substrate, and the presence or absence of adhesive leakage from the adhesive layer were visually inspected, and the durability was evaluated according to the following criteria. As a result of the observation, if there was no change in appearance, it was evaluated as "Good," and if lifting, delamination, or damage occurred, it was evaluated as "Poor."

[0173] Evaluation items Viscosity (mPas) Hardened Tg (°C) Curing properties Inkjet printer application 180° peel strength (gf / 25mm) High temperature durability Low temperature durability Flexural adhesive Example 1 24 -27 Good Good 1740 Good Good Good Example 2 20 -50 Good Good 1240 Good Good Good Example 3 23 -41 Good Good 1380 Good Good Good Example 4 32 -1 Good Good 3310 Good Good Good Example 5 50 -26 Good Good 1990 Good Good Good Example 6 5.1 -19 Good Good 2410 Good Good Good Example 7 16 -30 Good Good 1560 Good Good Good Example 8 19 -25 Good Good 1820 Good Good Good Example 9 23 -28 Good Good 1690 Good Good Good Example 10 23 -27 Good Good 1680 Good Good Good Example 11 22 -26 Good Good 1720 Good Good Good Comparative Example 1 25 -27 Good Good 1880 error Good error Comparative Example 2 39 -36 Good Good 740 Good Good error Comparative Example 3 27 14 Good Good 2470 Good error error Comparative Example 4 18 -58 Good Good 1530 error Good Good Comparative Example 5 2.7 -46 Good error 1290 Good Good Good Comparative Example 6 71 -31 Good error 1830 Good Good Good Comparative Example 7 19 -41 Good Good 620 Good Good error Comparative Example 8 28 -21 Good Good 2940 Good error error Comparative Example 9 6150 -41 Good Cannot be applied 390 Good Good error Comparative Example 10 8170 -46 Good Cannot be applied 550 Good Good error Comparative Example 11 88 54 Good error 570 Good error error Comparative Example 12 Unmeasurable -4 Good Cannot be applied 120 Good Good error Comparative Example 13 Unmeasurable -24 Good Cannot be applied 50 Good Good error Comparative Example 14 Unmeasurable -9 Good Cannot be applied 60 Good Good error Comparative Example 15 Unmeasurable -31 Good Cannot be applied 90 Good Good error Comparative Example 16 21 -23 error Good 1220 error Good error Comparative Example 17 11 Unmeasurable error Good Unmeasurable error error error Comparative Example 18 12 Unmeasurable error Good Unmeasurable error error error Comparative Example 19 11 Unmeasurable error Good Unmeasurable error error error

[0175] Referring to the results in Table 3, it can be confirmed that Examples 1 to 11 have a low viscosity of 5 mPa·s or more and 50 mPa·s or less in the resin composition state. The resin compositions of Examples 1 to 11 can be used to form a uniform coating film of thin thickness by having low viscosity characteristics.

[0176] In Examples 1 to 11, (meth)acrylate (A) was used in an amount of 5 wt% or more and 30 wt% or less, polymer (B) in an amount of 0.1 wt% or more and 5 wt% or less, monofunctional (meth)acrylate (C) in an amount of 50 wt% or more and 88 wt% or less, and urethane (meth)acrylate oligomer (D) in an amount of 1 wt% or more and 15 wt% or less. In Examples 1 to 11, it was confirmed that the resin composition containing the above material combinations has a low glass transition temperature after photocuring, high adhesion characteristics to glass substrates, etc., excellent durability under high and low temperature conditions, and excellent adhesion under repeated folding conditions. Accordingly, when forming an adhesive member applied to a flexible display device using the resin composition of the examples, durability and folding characteristics can be improved.

[0177] In the case of Comparative Example 1, compared to the resin composition of the Example, it does not contain polymer (B), so the durability at high temperature is reduced, and breakage of the cured resin occurred during the bending adhesion test. In the case of Comparative Example 2, compared to the resin composition of the Example, it contains more than 5% by weight of polymer (B), so the adhesion to glass and polyethylene terephthalate is reduced, and delamination occurred during the bending adhesion test. In the case of Comparative Example 3, compared to the resin composition of the Example, the glass transition temperature of the cured product is greater than 0°C, so the cured resin composition loses flexibility, delamination occurred during the durability test under low temperature conditions (-20°C), and breakage of the resin was confirmed during the bending adhesion test. In the case of Comparative Example 4, compared to the resin composition of the Example, the glass transition temperature of the cured product is less than -50°C, so the durability at high temperature is reduced, and delamination and deformation of the resin were confirmed during the durability test at 85°C. In the case of Comparative Examples 5 and 6, unlike the resin composition of the Example, the viscosity at 25°C falls outside the range of 5 mPa·s or more and 50 mPa·s or less, making precise coating with an inkjet printer impossible. Specifically, as in Comparative Example 5, when the viscosity is less than 5 mPa·s, ejection failure occurs, resulting in defects during pattern formation; and as in Comparative Example 6, when the viscosity exceeds 50 mPa·s, thickness variation occurs after ejection, making uniform coating impossible. In the case of Comparative Example 7, compared to the resin composition of the Example, (meth)acrylate (A) is not included, so the adhesion to glass and polyethylene terephthalate is significantly reduced, and delamination occurred during the bending adhesion test. In the case of Comparative Example 8, compared to the resin composition of the example, the (meth)acrylate (A) was included in excess of 30 weight%, which increased the glass transition temperature and caused the cured resin composition to lose flexibility, resulting in delamination in the durability test under low temperature conditions (-20℃) and failure of the resin in the bending adhesion test.

[0178] In the case of Comparative Example 9, compared to the resin composition of the example, the monofunctional (meth)acrylate (C) was included in an amount of less than 50% by weight, resulting in high viscosity that made it impossible to apply with an inkjet printer, and the flexibility was reduced, causing resin breakage in the bending adhesion test. In the case of Comparative Example 10, compared to the resin composition of the example, the urethane (meth)acrylate oligomer (D) was included in an amount of more than 15% by weight, resulting in high viscosity that made it impossible to apply with an inkjet printer, and (meth)acrylate (A) was not included, which significantly reduced the adhesion to glass and polyethylene terephthalate, and delamination occurred in the bending adhesion test. In the case of Comparative Example 11, compared to the resin composition of the example, the viscosity was high, causing thickness variation when applied with an inkjet printer, and the high glass transition temperature resulted in low flexibility at low temperatures, causing delamination in the durability test at -20°C, and the polymer (B) was not included, resulting in reduced flexibility, and resin breakage occurred in the bending adhesion test. In the case of Comparative Examples 12 to 15, compared to the resin composition of the Example, they contain an oil gelling agent, forming a gel state with a viscosity so high that viscosity measurement is impossible, making them unsuitable for inkjet printer application. Additionally, they contain more than 5% by weight of polymer (B), resulting in significantly reduced adhesion to glass and polyethylene terephthalate, and delamination occurred during the flexural adhesion test. Comparative Example 16 contains 2% organic solvent, and clouding occurred after UV curing, and delamination occurred during the high-temperature durability test and flexural adhesion test. Comparative Examples 17 to 19 contain 10% organic solvent, and curing failure occurred because they formed a gel state even after UV curing, requiring an additional drying process after curing. Furthermore, delamination occurred during the high-temperature and low-temperature durability tests and flexural adhesion test.

[0179] The resin composition of one embodiment has a viscosity prior to curing of 5 mPa·s or more and 50 mPa·s or less, which is advantageous for forming a uniform coating film with a thin thickness, and due to its low viscosity, it can exhibit excellent coating properties even on curved surfaces. In addition, the adhesive member of one embodiment formed by curing the resin composition of one embodiment has a low glass transition temperature of -50°C or more and 0°C or less, and has a high 180° peel strength of 1000 gf / 25mm or more for polyethylene terephthalate film and glass. Through this, the display device of one embodiment, including the adhesive member formed through the resin composition of one embodiment, exhibits good reliability without peeling or lifting of the adhesive member in curved parts, has excellent durability in low and high temperature ranges, and exhibits excellent operational reliability without peeling between the adhesive member and adjacent members even in bending or folding operation states.

[0180] In addition, the resin composition of one embodiment enables the formation of an adhesive member having high flexibility without the use of plasticizers and organic solvents, and thus does not require additional processes such as an organic solvent drying process, thereby reducing the process cost and time of the adhesive member formed by curing the resin composition and the display device including it, and increasing productivity.

[0181] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art or those with ordinary knowledge in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the invention as described in the claims set forth below.

[0182] Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims. Explanation of the symbols

[0183] DD, DD-a, DD-b, DD-1: Display device RC: Resin composition AP: Adhesive member

Claims

Claim 1 A resin composition comprising: a (meth)acrylate (A) containing hydroxyl groups and having a weight-average molecular weight of 500 or less; a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and having a weight-average molecular weight of 2,000 or more and 35,000 or less; a monofunctional (meth)acrylate (C) different from the (meth)acrylate (A); and a urethane (meth)acrylate oligomer (D) having a weight-average molecular weight of 6,000 or more; wherein, based on the total amount of the resin composition, the (meth)acrylate (A) comprises 5% by weight or more and 30% by weight or less; the polymer (B) comprises 0.1% by weight or more and 5% by weight or less; and the monofunctional (meth)acrylate (C) comprises 50% by weight or more and 88% by weight or less. A resin composition comprising 1% by weight or more and 15% by weight or less of the above urethane (meth)acrylate oligomer (D); wherein, after curing, the glass transition temperature is -50°C or higher and 0°C or lower, and the viscosity at 20°C or higher and 30°C or lower measured by the JIS K 2283 method is 5 mPa·s or higher and 50 mPa·s or lower. Claim 2 delete Claim 3 delete Claim 4 A resin composition according to claim 1, wherein at least one of the (meth)acrylate (A), the polymer (B), and the monofunctional (meth)acrylate (C) is included in two or more types. Claim 5 delete Claim 6 delete Claim 7 In claim 1, the resin composition is a resin composition having a 180° peel strength of 1000 gf / 25mm or more for polyethylene terephthalate (PET) film and glass after curing. Claim 8 A resin composition according to claim 1, further comprising at least one radical polymerization initiator. Claim 9 A resin composition according to claim 1, wherein the resin composition further comprises an organic solvent, and the organic solvent is included in an amount of 1 weight% or less relative to the total amount of the resin composition. Claim 10 A polymer derived from a resin composition comprising: a (meth)acrylate (A) containing hydroxyl groups and having a weight-average molecular weight of 500 or less; a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and having a weight-average molecular weight of 2,000 or more and 35,000 or less; a monofunctional (meth)acrylate (C) different from the (meth)acrylate (A); and a urethane (meth)acrylate oligomer (D) having a weight-average molecular weight of 6,000 or more; wherein the resin composition comprises, with respect to the total amount of the resin composition, 5% or more by weight or less of the (meth)acrylate (A); 0.1% or more by weight or less of the polymer (B); and 50% or more by weight or less of the monofunctional (meth)acrylate (C). An adhesive member comprising 1% by weight or more and 15% by weight or less of the above urethane (meth)acrylate oligomer (D); wherein the glass transition temperature is -50°C or higher and 0°C or lower, and the resin composition has a viscosity of 5 mPa·s or higher and 50 mPa·s or lower at 20°C or higher and 30°C or lower as measured by the JIS K 2283 method. Claim 11 In item 10, the polymer is an adhesive member in which the resin composition is photocured. Claim 12 delete Claim 13 delete Claim 14 A display panel; a window disposed on the display panel; and an adhesive member disposed between the display panel and the window; wherein the adhesive member is derived from a resin composition comprising: (meth)acrylate (A) having hydroxyl groups and a weight average molecular weight of 500 or less; a polymer (B) having a main backbone of polyisoprene or polybutadiene, having at least one radical reactive group within one molecule, and a weight average molecular weight of 2,000 or more and 35,000 or less; a monofunctional (meth)acrylate (C) different from the (meth)acrylate (A); and a urethane (meth)acrylate oligomer (D) having a weight average molecular weight of 6,000 or more; wherein the resin composition comprises 5% or more and 30% by weight of the (meth)acrylate (A) and 0.1% or more and 5% by weight of the polymer (B) based on the total amount of the resin composition. A display device comprising: 50% by weight or more and 88% by weight or less of the monofunctional (meth)acrylate (C); and 1% by weight or more and 15% by weight or less of the urethane (meth)acrylate oligomer (D); wherein the adhesive member has a glass transition temperature of -50°C or more and 0°C or less, and the resin composition has a viscosity of 5 mPa·s or more and 50 mPa·s or less at 20°C or more and 30°C or less as measured by the JIS K 2283 method. Claim 15 A display device according to claim 14, wherein the thickness of the adhesive member is 50 μm or more and 200 μm or less. Claim 16 In claim 14, the display device further comprises an input sensing member disposed on the display panel, wherein the adhesive member is disposed between the display panel and the input sensing member or between the input sensing member and the window. Claim 17 In claim 16, the display panel comprises a display element layer and an encapsulation layer disposed on the display element layer, the input sensing member is disposed directly on the encapsulation layer, and the adhesive member is disposed on the input sensing member. Claim 18 In claim 14, the adhesive member is formed by directly providing the resin composition onto one side of the window or one side of the display panel and ultraviolet curing the provided resin composition. Claim 19 A display device according to claim 14, comprising at least one folding region, wherein the radius of curvature of the folding region is 5 mm or less. Claim 20 A display device according to claim 14, further comprising a light control layer disposed between the adhesive member and the window, and an optical adhesive layer disposed between the light control layer and the window, wherein the optical adhesive layer comprises a polymer derived from the resin composition.

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