Adhesive composition, display apparatus, and electronic apparatus

Abstract

The present invention provides an adhesive composition having easy folding and excellent impact resistance, for display devices and electronic devices, comprising a first acrylate-based compound containing an acryloyl group, a second acrylate-based compound different from the first acrylate-based compound and containing at least one of a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group and an acryloyl group, a siloxane-based compound containing a siloxane group, and a crosslinking agent.

Description

Technology Field

[0001] Embodiments of the present invention relate to adhesive compositions, display devices, and electronic devices, and more specifically, to adhesive compositions, display devices, and electronic devices that are easy to fold and have excellent impact resistance. Background Technology

[0002] To support various functions, the electronic device includes a display device capable of providing visual information, such as images or videos, to the user. The display device must be flexible so that it can be bent or folded, and the flexible display device is required to be lightweight and thin.

[0003] Meanwhile, the display device may have a structure in which multiple components are stacked. To attach the multiple components of the display device, an adhesive layer containing a cured product of an adhesive composition is used. The adhesive layer must not excessively increase the repulsive force of the display device during folding so that the display device can be easily folded. In addition, the adhesive layer must improve the impact resistance of the display device, which is subject to reduced strength due to lightweighting and thinning. The problem to be solved

[0004] However, these conventional display devices have a problem in that folding the display device is not easy as the impact resistance of the display device improves.

[0005] The present invention aims to solve various problems, including those mentioned above, by providing an adhesive composition, a display device, and an electronic device that are easy to fold and have excellent impact resistance. However, these problems are examples and do not limit the scope of the present invention. means of solving the problem

[0006] According to one aspect of the present invention, an adhesive composition is provided comprising a first acrylate-based compound having an acryloyl group, a second acrylate-based compound different from the first acrylate-based compound having at least one of a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group and an acryloyl group, a siloxane-based compound having a siloxane group, and a crosslinking agent.

[0007] When the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent included in the adhesive composition is 100 wt%, the adhesive composition may contain the first acrylate-based compound in an amount of 70 wt% or more and 80 wt% or less, the adhesive composition may contain the second acrylate-based compound in an amount of 10 wt% or more and 20 wt% or less, the adhesive composition may contain the siloxane-based compound in an amount of 1 wt% or more and 10 wt% or less, and the adhesive composition may contain the crosslinking agent in an amount of 0.1 wt% or more and 3 wt% or less.

[0008] The second acrylate-based compound comprises at least one of acrylic acid, carboxyethyl acrylate, carboxypropyl acrylate, carboxybutyl acrylate, hydroxyethyl acrylate, n-hydroxypropyl acrylate, n-hydroxybutyl acrylate, acrylamide, n-diethyl acrylamide, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminopropyl acrylate, and glycidyl acrylate, and the siloxane-based compound may comprise at least one of polydimethylsiloxane, polymethylphenylsiloxane, and polydiphenylsiloxane.

[0009] The first acrylate-based compound comprises a first acrylate-based monomer having an acryloyl group and a polymer formed by polymerizing the first acrylate-based monomer, and the first acrylate-based monomer may comprise at least one of 2-ethylhexyl acrylate, butyl acrylate, and ethyl acrylate.

[0010] The above crosslinking agent may include at least one of 1,6-hexanediol diacrylate and dipentaerythritol hexaacrylate.

[0011] According to one aspect of the present invention, a display device is provided comprising a display panel including a display element, a cover window disposed on the display panel, and a first adhesive layer interposed between the display panel and the cover window, wherein the first adhesive layer comprises a cured product of an adhesive composition, and the adhesive composition comprises a first acrylate-based compound including an acryloyl group, a second acrylate-based compound different from the first acrylate-based compound and including at least one of an acryloyl group, a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group, a siloxane-based compound including a siloxane group, and a crosslinking agent.

[0012] When the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent included in the adhesive composition is 100 wt%, the adhesive composition may contain the first acrylate-based compound in an amount of 70 wt% or more and 80 wt% or less, the adhesive composition may contain the second acrylate-based compound in an amount of 10 wt% or more and 20 wt% or less, the adhesive composition may contain the siloxane-based compound in an amount of 1 wt% or more and 10 wt% or less, and the adhesive composition may contain the crosslinking agent in an amount of 0.1 wt% or more and 3 wt% or less.

[0013] The second acrylate-based compound comprises at least one of acrylic acid, carboxyethyl acrylate, carboxypropyl acrylate, carboxybutyl acrylate, hydroxyethyl acrylate, n-hydroxypropyl acrylate, n-hydroxybutyl acrylate, acrylamide, n-diethyl acrylamide, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminopropyl acrylate, and glycidyl acrylate, and the siloxane-based compound may comprise at least one of polydimethylsiloxane, polymethylphenylsiloxane, and polydiphenylsiloxane.

[0014] The first acrylate-based compound comprises a first acrylate-based monomer having an acryloyl group and a polymer formed by polymerizing the first acrylate-based monomer, and the first acrylate-based monomer may comprise at least one of 2-ethylhexyl acrylate, butyl acrylate, and ethyl acrylate.

[0015] The above crosslinking agent may include at least one of 1,6-hexanediol diacrylate and dipentaerythritol hexaacrylate.

[0016] The above display device further comprises a window protection layer disposed on the cover window and a second adhesive layer interposed between the cover window and the window protection layer, and the second adhesive layer may include the same material as the first adhesive layer.

[0017] The above display device further comprises a lower protective layer disposed below the display panel, a barrier layer disposed below the lower protective layer, a support layer disposed below the barrier layer, and a third adhesive layer interposed between the display panel and the lower protective layer, wherein the third adhesive layer may include the same material as the first adhesive layer.

[0018] The above display device further comprises a fourth adhesive layer interposed between the lower protective layer and the barrier layer, and the fourth adhesive layer may include the same material as the first adhesive layer.

[0019] The above display device further comprises a fifth adhesive layer interposed between the barrier layer and the support layer, and the fifth adhesive layer may include the same material as the first adhesive layer.

[0020] The above display device further comprises an upper protective layer interposed between the display panel and the cover window, and a sixth adhesive layer interposed between the display panel and the upper protective layer, wherein the first adhesive layer is interposed between the upper protective layer and the cover window, and the sixth adhesive layer may include the same material as the first adhesive layer.

[0021] The above display device may include a first non-folding area, a second non-folding area, and a foldable area between the first non-folding area and the second non-folding area.

[0022] The above display device can be folded so that a part of one side of the display device and another part of the one side face each other.

[0023] According to one aspect of the present invention, an electronic device is provided comprising a processor and a display device controlled by the processor, wherein the display device comprises a display panel including a display element, a cover window disposed on the display panel, and a first adhesive layer interposed between the display panel and the cover window, wherein the first adhesive layer comprises a cured product of an adhesive composition, and the adhesive composition comprises a first acrylate-based compound including an acryloyl group, a second acrylate-based compound different from the first acrylate-based compound and including at least one of an acryloyl group, a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group, a siloxane-based compound including a siloxane group, and a crosslinking agent.

[0024] When the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent included in the adhesive composition is 100 wt%, the adhesive composition may contain the first acrylate-based compound in an amount of 70 wt% or more and 80 wt% or less, the adhesive composition may contain the second acrylate-based compound in an amount of 10 wt% or more and 20 wt% or less, the adhesive composition may contain the siloxane-based compound in an amount of 1 wt% or more and 10 wt% or less, and the adhesive composition may contain the crosslinking agent in an amount of 0.1 wt% or more and 3 wt% or less.

[0025] The above display device includes a first non-folding area, a second non-folding area, and a foldable area between the first non-folding area and the second non-folding area, and the display device can be folded so that a part of one side of the display device and another part of the one side face each other.

[0026] Other aspects, features, and advantages other than those described above will become clear from the following specific details, claims, and drawings for implementing the invention. Effects of the invention

[0027] According to one embodiment of the present invention as described above, an adhesive composition, a display device, and an electronic device having easy folding and excellent impact resistance can be realized. Of course, the scope of the present invention is not limited by these effects. Brief explanation of the drawing

[0028] FIG. 1a is a block diagram schematically illustrating an electronic device according to one embodiment of the present invention. FIG. 1b is a schematic diagram illustrating electronic devices according to embodiments of the present invention. FIG. 2 is a perspective view schematically illustrating a display device according to one embodiment of the present invention. FIG. 3 is a side view schematically illustrating a display device according to one embodiment of the present invention. FIG. 4 is a cross-sectional view schematically illustrating a cross-section taken along the line I-I' of the display device of FIG. 2. FIG. 5 is a plan view schematically illustrating a display panel included in the display device of FIG. 4. FIG. 6 is an equivalent circuit diagram of a pixel circuit included in the display panel of FIG. 5. FIG. 7 is a cross-sectional view schematically illustrating a cross section taken along the line II-II' of the display panel of FIG. 5. FIG. 8 is a graph showing the ball drop evaluation results of display devices according to one embodiment and a comparative example of the present invention. FIG. 9 is a graph showing the pen drop evaluation results of display devices according to one embodiment and a comparative example of the present invention. FIG. 10 is a cross-sectional view schematically illustrating a display device according to one embodiment of the present invention. Specific details for implementing the invention

[0029] The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms.

[0030] In this specification, terms such as "first," "second," etc. are used not in a limiting sense, but for the purpose of distinguishing one component from another.

[0031] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0032] In this specification, terms such as "comprising" or "having" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added.

[0033] In this specification, "A and / or B" indicates the case where it is A, B, or both A and B. And, "at least one of A and B" indicates the case where it is A, B, or both A and B.

[0034] In this specification, when various components such as layers, films, regions, and plates are described as being "on" another component, this includes not only cases where they are "directly on" another component, but also cases where other components are interposed between them.

[0035] In this specification, when it is stated that a membrane, region, component, etc. is connected, it includes cases where the membrane, region, or component is directly connected, or / or cases where other membranes, regions, or components are interposed between them to form an indirect connection. For example, when it is stated that a membrane, region, or component, etc. is electrically connected in this specification, it indicates cases where the membrane, region, or component, etc. are directly electrically connected, and / or cases where other membranes, regions, or components are interposed between them to form an indirect electrical connection.

[0036] In this specification, the x-axis, y-axis, and z-axis are not limited to three axes in an orthogonal coordinate system and may be interpreted in a broader sense that includes them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but they may also refer to different directions that are not orthogonal to each other.

[0037] Where any embodiment in this specification can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the order described.

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted. For convenience of explanation, the size of components in the drawings may be exaggerated or reduced. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is depicted.

[0039] FIG. 1a is a block diagram schematically illustrating an electronic device (1) according to an embodiment of the present invention. The electronic device (1) according to the present embodiment may further include modules having additional functions in addition to the display module (11). For example, as shown in FIG. 1a, the electronic device (1) according to the present embodiment may include a display module (11), a processor (12), a memory (13), and a power module (14).

[0040] The processor (12) can control the components of the electronic device (1). The processor (12) may include at least one of a central processing unit (CPU), an application processor (AP), a graphic processing unit (GPU), a communication processor (CP), an image signal processor (ISP), and a controller.

[0041] The memory (13) can store data information necessary for the operation of the processor (12) or the display module (11). When the processor (12) executes an application stored in the memory (13), data signals and / or input control signals for an image are transmitted to the display module (11), and the display module (11) can process the received signals to output image information.

[0042] The power module (14) may include a power supply module, such as a power adapter or battery device, and a power conversion module that converts the power supplied by the power supply module to generate power required for the operation of the electronic device (1).

[0043] FIG. 1b is a schematic diagram illustrating electronic devices (1) according to embodiments of the present invention. Referring to FIG. 1b, electronic devices (1) including a display module (11) may include image display electronic devices such as a smartphone (1a), tablet PC (1b), laptop (1c), TV (1d), and desk monitor (1e), as well as wearable electronic devices including a display module such as smart glasses (1f), head-mounted display (1g), and smart watch (1h), and automotive electronic devices (1i) including a display module such as a CID (Center Information Display) and room mirror display placed on the instrument panel, center fascia, and dashboard of a car.

[0044] Meanwhile, the display module (11) may include a display device (10, see FIG. 2). The display device (10) may be applied to various electronic devices (1). That is, the electronic device (1) includes the display device (10) and may further include modules or devices having additional functions other than the display device (10). For example, the electronic device (1) may include a display device (10), a processor (12), a memory (13), and a power module (14), and the display device (10) may be controlled by the processor (12). Below, the description will focus on the display device (10).

[0045] FIG. 2 is a perspective view schematically illustrating a display device (10) according to an embodiment of the present invention. As shown in FIG. 2, the display device (10) may have a polygonal shape including a rectangle. For example, the display device (10) may have a rectangular shape in which the horizontal length is shorter than the vertical length, a rectangular shape in which the horizontal length is longer than the vertical length, or a square shape. Alternatively, the display device (10) may have various shapes such as an ellipse or a circle. FIG. 2 illustrates the display device (10) having a rectangular shape in which the horizontal length is shorter than the vertical length, but the present invention is not limited thereto.

[0046] The display device (10) may include a first surface (S1) and a second surface (S2, see FIG. 3) opposite to the first surface (S1). The display device (10) may display an image on the first surface (S1). That is, the first surface (S1) may include a display surface. In one embodiment, the first surface (S1) may be the upper surface (in the +z direction) of the display device (10). The second surface (S2) may be the lower surface (in the -z direction) of the display device (10). In some embodiments, the display device (10) may also display an image on the second surface (S2).

[0047] The display device (10) can be folded. That is, at least a portion of the display device (10) may have flexibility, and the display device (10) can be folded as the flexible portion is bent. For example, the display device (10) can be folded as shown in FIG. 3, which is a side view schematically illustrating the display device (10) according to one embodiment of the present invention. That is, FIG. 2 is a perspective view illustrating the unfolded state of the display device (10), and FIG. 3 is a side view illustrating the folded state of the display device (10).

[0048] Accordingly, it may include a folding area and a non-folding area provided on at least one side of the folding area. In this specification, "non-folding" means not folding, and this includes not only cases where it is rigid and not flexible so as not to fold, but also cases where it is flexible but not to fold. The display device (10) can display an image in the folding area as well as in the non-folding area.

[0049] As illustrated in FIG. 2, the display device (10) may include a first non-folding area (NFA1), a second non-folding area (NFA2), and a foldable area (FA). The first non-folding area (NFA1) and the second non-folding area (NFA2) may be non-folding areas, and the foldable area (FA) may be a flexible area that can be folded.

[0050] The foldable area (FA) may be extended in a direction that intersects a virtual straight line connecting the first non-folding area (NFA1) and the second non-folding area (NFA2). Specifically, when the display device (10) is in an unfolded state, the first non-folding area (NFA1) and the second non-folding area (NFA2) may be spaced apart from each other along a first direction (e.g., the x-axis direction). The foldable area (FA) may be positioned between the first non-folding area (NFA1) and the second non-folding area (NFA2). Specifically, the first non-folding area (NFA1) may be adjacent to one side of the foldable area (FA), and the second non-folding area (NFA2) may be adjacent to the other side of the foldable area (FA). When the display device (10) is in an unfolded state, the foldable area (FA) may be extended in a second direction (e.g., the y-axis direction) that intersects the first direction.

[0051] A folding line (FL) may be provided within the foldable area (FA) along a second direction (e.g., the y-axis direction) which is the extension direction of the foldable area (FA). Accordingly, the display device (10) may be folded in the foldable area (FA). The foldable area (FA) and the folding line (FL) of the foldable area (FA) may overlap with the area where an image of the display device (10) is displayed, and when the display device (10) is folded, the portion displaying the image may be folded.

[0052] In FIG. 2, for convenience of explanation, the first non-folding area (NFA1) and the second non-folding area (NFA2) are shown having the same or similar area, and the display device (10) is shown having one foldable area (FA); however, the present invention is not limited thereto. For example, the first non-folding area (NFA1) and the second non-folding area (NFA2) may have different areas. In addition, the display device (10) may have a plurality of foldable areas (FA). In this case, the plurality of non-folding areas are spaced apart from each other, and each of the plurality of foldable areas (FA) may be placed between the non-folding areas. Each foldable area (FA) may be folded along a folding line (FL), and the folding line (FL) may be provided in multiple numbers.

[0053] Meanwhile, in FIG. 2, the folding line (FL) passes through the center of the foldable region (FA) and the foldable region (FA) is shown as being symmetric with respect to the folding line (FL), but the present invention is not limited thereto. For example, the folding line (FL) may be provided asymmetrically within the foldable region (FA).

[0054] As illustrated in FIG. 3, the display device (10) can be folded so that the first surface (S1) of the first non-folding area (NFA1) and the first surface (S1) of the second non-folding area (NFA2) face each other with respect to the folding line (FL). In other words, as the foldable area (FA) of the display device (10) bends, the first surface (S1) of the first non-folding area (NFA1) and the first surface (S1) of the second non-folding area (NFA2) can be positioned to face each other. Even when the display device (10) is folded, the foldable area (FA) can be extended in a direction that intersects with an imaginary straight line connecting the first non-folding area (NFA1) and the second non-folding area (NFA2). Specifically, when the display device (10) is folded, it may be extended in a second direction (e.g., y-axis direction) that intersects a virtual straight line (e.g., a straight line parallel to the z-axis direction) connecting the first non-folding area (NFA1) and the second non-folding area (NFA2). Meanwhile, the foldable area (FA) may be unfolded again after being bent. That is, the display device (10) may be a foldable display device.

[0055] Meanwhile, the term "folded" in this specification means that the shape is not fixed but is transformed from the original shape into a different shape, and includes being folded, curved, or bent along one or more specific lines, namely folding lines (FL). Accordingly, FIG. 3 illustrates a state in which the first surface (S1) of the first non-folding area (NFA1) and the first surface (S1) of the second non-folding area (NFA2) are arranged parallel to each other and folded to face each other, but the present invention is not limited thereto. For example, the first surface (S1) of the first non-folding area (NFA1) and the first surface (S1) of the second non-folding area (NFA2) may be folded at a predetermined angle (e.g., acute angle, right angle, or obtuse angle) with the foldable area (FA) in between.

[0056] In addition, in FIG. 3, the display device (10) is shown as being folded, that is, in-folded, so that a part of the first surface (S1) and another part of the first surface (S1) face each other, but the present invention is not limited thereto. For example, the display device (1) can be folded so that a part of the second side (S2) and another part of the second side (S2) face each other, i.e., it can be out-folded. In other words, the display device (10) may be in an in-folding form where parts of the display surface are folded so that they face each other when the display device (10) is folded, or in an out-folding form where the display surface is exposed to the outside when the display device (10) is folded. That is, the display device (10) can be folded so that a part of one side of the display device (10) and another part of said one side face each other. For convenience of explanation, the following description will focus on the case where the display device (10) is in an in-folding form.

[0057] FIG. 4 is a cross-sectional view schematically illustrating a cross section taken along the line I-I' of the display device (10) of FIG. 2. FIG. 5 is a plan view schematically illustrating a display panel (DP) included in the display device (10) of FIG. 4. As shown in FIG. 4, the display device (10) may include a display panel (DP), a cover window (CW), a window protection layer (CWP), a lower protection layer (LP), a barrier layer (BL), a first plate (P1), a second plate (P2), a cushion layer (CL), and an insulating layer (IL). That is, the display device (10) may have a structure in which a plurality of components are stacked. The display device (10) further includes a plurality of adhesive layers, and these adhesive layers may be placed between the components of the display device (10) to attach one component to another component. Of course, if necessary, the display device (10) may include various other components in addition to the components shown in FIG. 4.

[0058] The display panel (DP) can display an image. That is, the image provided by the display device (10) can be understood as being implemented by the display panel (DP). To this end, the display panel (DP) may include a plurality of display elements, and the plurality of display elements may emit light. Accordingly, the display panel (DP) can display an image through the light emitted from the plurality of display elements.

[0059] In one embodiment, the display element may be an organic light-emitting diode (OLED) comprising an organic light-emitting layer. Alternatively, the display element may be a light-emitting diode (LED). The size of the light-emitting diode (LED) may be micro-scale or nano-scale. For example, the light-emitting diode may be a micro-light-emitting diode. Alternatively, the light-emitting diode may be a nanorod light-emitting diode. The nanorod light-emitting diode may include gallium nitride (GaN). In one embodiment, a color conversion layer may be disposed on the nanorod light-emitting diode. The color conversion layer may include quantum dots. Alternatively, the display element may be a quantum dot light-emitting diode (QD) comprising a quantum dot light-emitting layer. Alternatively, the display element may be an inorganic light-emitting diode comprising an inorganic semiconductor. A detailed description of the components included in the display panel (DP) will be provided later.

[0060] As described above, the display device (10) may include a first non-folding area (NFA1), a second non-folding area (NFA2), and a foldable area (FA). Of course, since the display device (10) includes a display panel (DP), it can be said that the display panel (DP) has the first non-folding area (NFA1), the second non-folding area (NFA2), and the foldable area (FA) as described above. For convenience, the following description will assume that the display panel (DP) has the first non-folding area (NFA1), the second non-folding area (NFA2), and the foldable area (FA).

[0061] That is, when the display panel (DP) is unfolded, the first non-folding area (NFA1) and the second non-folding area (NFA2) may be spaced apart from each other along a first direction (e.g., the x-axis direction). The foldable area (FA) may be placed between the first non-folding area (NFA1) and the second non-folding area (NFA2) and may extend in a direction that intersects with a virtual straight line connecting the first non-folding area (NFA1) and the second non-folding area (NFA2). The folding line (FL) may be provided within the foldable area (FA) along a second direction (e.g., the y-axis direction), which is the extension direction of the foldable area (FA). Accordingly, the display panel (DP) may be folded in the foldable area (FA).

[0062] As illustrated in FIG. 5, the display panel (DP) may include a display area (DA) in which a plurality of pixels (PX) are arranged and a peripheral area (PA) located outside the display area (DA).

[0063] Each pixel (PX) of the display panel (DP) is an area capable of emitting light of a predetermined color, and the display panel (DP) can provide an image using the light emitted from the pixels (PX). For example, each pixel (PX) can emit red light, green light, or blue light. That is, one display element can correspond to one pixel.

[0064] The display area (DA) is an area that provides an image and may have a polygonal shape including a rectangle, as shown in FIG. 5. For example, the display area (DA) may have a rectangular shape where the width is longer than the height, a rectangular shape where the width is shorter than the height, or a square shape. Alternatively, the display area (DA) may have various shapes such as an ellipse or a circle.

[0065] The peripheral area (PA) is a non-display area that does not provide an image and can completely surround the display area (DA). Specifically, pixels (PX) are not placed in the peripheral area (PA), and drivers for providing electrical signals or power to the pixels (PX) may be placed in the peripheral area (PA). Meanwhile, pads (not shown) may be placed in the peripheral area (PA), and electronic components or printed circuit boards may be electrically connected to these pads. Each pad is spaced apart from one another in the peripheral area (PA), and each pad may be electrically connected to a plurality of connecting wires placed in the peripheral area (PA). The connecting wires may electrically connect the pads to signal lines placed in the display area (DA), such as data lines (DL, see FIG. 6) (or scan lines (SL, see FIG. 6)).

[0066] A cover window (CW) may be placed on a display panel (DP). Specifically, the cover window (CW) may be placed on the upper surface (in the +z direction) of the display panel (DP). Here, the 'upper surface' of the display panel (DP) may be defined as the surface facing the direction in which the display panel (DP) provides an image. According to one embodiment, the cover window (CW) may be placed to cover the upper surface of the display panel (DP). Such a cover window (CW) may function to protect the upper surface of the display panel (DP). Additionally, since the cover window (CW) forms the exterior of the display device (10), it may include flat and curved surfaces corresponding to the shape of the display device (10).

[0067] The cover window (CW) may have a high transmittance to transmit light emitted from the display panel (DP) and may have a thin thickness to minimize the weight of the display device (10). In addition, the cover window (CW) may have high strength and hardness to protect the display panel (DP) from external impacts. The cover window (CW) may be a flexible window. The cover window (CW) can protect the display panel (DP) by easily bending according to external forces without the occurrence of cracks, etc.

[0068] The cover window (CW) may include glass, sapphire, or plastic. For example, the cover window (CW) may be ultra-thin reinforced glass (UTG) whose strength has been enhanced by methods such as chemical strengthening or thermal strengthening. ® It may be a transparent polyimide (Colorless Polyimide, CPI). The cover window (CW) may have a structure in which a flexible polymer layer is disposed on one side of a glass substrate, or it may be composed only of a polymer layer. The image displayed by the display panel (DP) may be provided to the user through the transparent cover window (CW). That is, the image provided by the display device (10) can be understood as being implemented by the display panel (DP).

[0069] A window protection layer (CWP) may be placed on a cover window (CW). The window protection layer (CWP) can protect the cover window (CW) and prevent or reduce scratches from occurring on the upper surface of the cover window (CW). The window protection layer (CWP) may be a plastic film containing a polymer resin. For example, the window protection layer (CWP) may include at least one of polymer resins such as polyethyleneterephthalate (PET), poly(butylene terephthalate) (PBT), polycarbonate (PC), polyethylene naphthalate (PEN), polystyrene (PS), polymethylmethacrylate (PMMA), polyvinyl chloride (PVC), polyethersulfone (PES), polypropylene (PP), and polyamide (PA).

[0070] A lower protective layer (LP) may be placed below a display panel (DP). The lower protective layer (LP) can protect the display panel (DP). For example, the lower protective layer (LP) can absorb external shocks applied to the lower surface (in the -z direction) of the display panel (DP). The lower protective layer (LP) may be a plastic film containing a polymer resin. For example, the lower protective layer (LP) may include at least one of the following polymer resins: polyethyleneterephthalate (PET), poly(butylene terephthalate) (PBT), polycarbonate (PC), polyethylene naphthalate (PEN), polystyrene (PS), polymethylmethacrylate (PMMA), polyvinyl chloride (PVC), polyethersulfone (PES), polypropylene (PP), and polyamide (PA).

[0071] A barrier layer (BL) may be placed below a lower protection layer (LP). The barrier layer (BL) can block external foreign substances or moisture from penetrating into the display panel (DP). In one embodiment, the barrier layer (BL) may include an organic insulating material such as polyethyleneterephthalate, polyimide (PI), or urethane acrylate.

[0072] In some embodiments, the barrier layer (BL) may further include a material that blocks ultraviolet rays (UV). For example, the barrier layer (BL) may include a base resin, an ultraviolet absorber, and inorganic particles. The ultraviolet absorber and inorganic particles may be provided dispersed in the base resin. For example, the base resin may be an acrylate-based resin, such as urethane acrylate. However, the present invention is not limited thereto, and any base resin that is optically transparent and capable of dispersing the ultraviolet absorber and inorganic particles may be used in the barrier layer (BL) without limitation. For example, the ultraviolet absorber may include at least one of benzotriazole-based, benzophenone-based, salicylic acid-based, salicylate-based, cyanoacrylate-based, cinnamate-based, oxanilide-based, polystyrene-based, azomethine-based, and triazine-based compounds.

[0073] The first plate (P1) can be placed below the barrier layer (BL). The first plate (P1) can be placed below the barrier layer (BL) to support the display panel (DP). Accordingly, the degree to which the center of the display panel (DP) sags in the -z direction due to its weight is reduced, so that it may not be easily damaged even if an external impact is applied.

[0074] The first plate (P1) may include a folding pattern (PP). When the display device (10) is folded, the shape of the folding pattern (PP) may vary or the length of the folding pattern (PP) may vary. As a result, the first plate (P1) can be folded more easily. For example, the folding pattern (PP) may be an opening provided in the first plate (P1). In another embodiment, the folding pattern (PP) may be in the form of an uneven surface. In yet another embodiment, the folding pattern (PP) may include links rotatably connected to each other.

[0075] The first plate (P1) may comprise at least one of metal, glass, and plastic. In one embodiment, the first plate (P1) may comprise polyurethane. In another embodiment, the first plate (P1) may comprise carbon fiber reinforced plastic (CFRP). In one embodiment, the folding pattern (PP) may comprise the same material as the first plate (P1) or a different material. In the claims, the first plate (P1) may be referred to as a support layer.

[0076] The second plate (P2) may be placed below the first plate (P1). Specifically, the second plate (P2) includes a second-1 plate (P21) and a second-2 plate (P22), and the second-1 plate (P21) and the second-2 plate (P22) may be placed so as to be separated from each other with respect to the folding line (FL). In other words, the second-1 plate (P21) and the second-2 plate (P22) may be placed spaced apart from each other with the folding line (FL) in between. That is, at least a portion of the second-1 plate (P21) may be placed below the first non-folding area (NFA1), and at least a portion of the second-2 plate (P22) may be placed below the second non-folding area (NFA2). The second plate (P2) can protect the display panel (DP) by absorbing external shocks.

[0077] The second plate (P2) may be a plate made of a metallic material. That is, the second plate (P2) may contain a metallic material. The second plate (P2) may contain a metal or an alloy of at least two metals. For example, the second plate (P2) may contain aluminum (Al), copper (Cu), iron (Fe), or chromium (Cr), etc. However, the present invention is not limited thereto.

[0078] Meanwhile, although not illustrated, an elastic member may be disposed below the portion of the first plate (P1) positioned below the foldable area (FA) of the first plate (P1). Specifically, the elastic member may cover the folding pattern (PP). The elastic member may improve the durability of the first plate (P1). The elastic member may include TPU (thermoplastic polyurethane).

[0079] The cushion layer (CL) can be placed below the second plate (P2). Specifically, the cushion layer (CL) includes a first cushion layer (CL1) and a second cushion layer (CL2), and the first cushion layer (CL1) and the second cushion layer (CL2) can be arranged to be separated from each other with respect to the folding line (FL). In other words, the first cushion layer (CL1) and the second cushion layer (CL2) can be arranged spaced apart from each other with the folding line (FL) in between. Specifically, the first cushion layer (CL1) can be placed below the second-1 plate (P21), and the second cushion layer (CL2) can be placed below the second-2 plate (P22). The cushion layer (CL) can absorb external shocks to prevent or minimize damage to the display panel (DP).

[0080] The cushion layer (CL) may include an elastic material. For example, it may include a foam formed from a polymer resin such as polyurethane, polyethylene, polycarbonate, polypropylene, or polyolefin. Alternatively, the cushion layer (520) may include an elastic material such as a sponge formed by foam molding rubber, a urethane-based material, or an acrylic-based material. However, the above materials are exemplary, and the cushion layer may include a material having excellent compressive stress and excellent shock and vibration absorption.

[0081] An insulating film (IF) may be placed below a cushion layer (CL). Specifically, the insulating film (IF) comprises a first insulating film (IF1) and a second insulating film (IF2), and the first insulating film (IF1) and the second insulating film (IF2) may be arranged to be separated from each other with respect to a folding line (FL). In other words, the first insulating film (IF1) and the second insulating film (IF2) may be arranged spaced apart from each other with the folding line (FL) in between. Specifically, the first insulating film (IF1) may be placed below a first cushion layer (CL1), and the second insulating film (IF2) may be placed below a second cushion layer (CL2). The insulating film (IF) can prevent or minimize rattling in the display device (10). The thickness of the insulating film (IF) may be about 15 μm. However, the present invention is not necessarily limited thereto.

[0082] As described above, the display device (10) further includes a plurality of adhesive layers, and these adhesive layers are disposed between the components of the display device (10) so that one component can be attached to another component. Specifically, the display device (10) may include a first adhesive layer (AL1), a second adhesive layer (AL2), a third adhesive layer (AL3), a fourth adhesive layer (AL4), and a fifth adhesive layer (AL5).

[0083] The first adhesive layer (AL1) may be interposed between the display panel (DP) and the cover window (CW). Specifically, the first adhesive layer (AL1) may be in direct contact with the cover window (CW). In one embodiment, the first adhesive layer (AL1) may be in direct contact with the display panel (DP). Accordingly, the first adhesive layer (AL1) can attach the cover window (CW) to the display panel (DP).

[0084] The first adhesive layer (AL1) may comprise a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent. That is, the first adhesive layer (AL1) may be in a state where a siloxane-based compound is dispersed in a material formed by polymerizing the first acrylate-based compound, the second acrylate-based compound, and the crosslinking agent. Accordingly, the first adhesive layer (AL1) may have a low modulus so that the display device (10) can be easily folded, and the display device (10) may have excellent impact resistance. A detailed description of the adhesive composition will be provided later regarding the cured product of the adhesive composition included in the first adhesive layer (AL1).

[0085] The second adhesive layer (AL2) may be interposed between the cover window (CW) and the window protection layer (CWP). Specifically, the second adhesive layer (AL2) may be in direct contact with the cover window (CW) and the window protection layer (CWP). Accordingly, the second adhesive layer (AL2) can attach the window protection layer (CWP) to the cover window (CW). The second adhesive layer (AL2) may contain the same material as the first adhesive layer (AL1). For example, the second adhesive layer (AL2) may contain a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent.

[0086] The third adhesive layer (AL3) may be interposed between the display panel (DP) and the lower protective layer (LP). Specifically, the third adhesive layer (AL3) may be in direct contact with the display panel (DP) and the lower protective layer (LP). Accordingly, the third adhesive layer (AL3) can attach the lower protective layer (LP) to the display panel (DP). The third adhesive layer (AL3) may contain the same material as the first adhesive layer (AL1). For example, the third adhesive layer (AL3) may contain a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent.

[0087] The fourth adhesive layer (AL4) may be interposed between the lower protective layer (LP) and the barrier layer (BL). Specifically, the fourth adhesive layer (AL4) may be in direct contact with the lower protective layer (LP) and the barrier layer (BL). Accordingly, the fourth adhesive layer (AL4) can attach the barrier layer (BL) to the lower protective layer (LP). The fourth adhesive layer (AL4) may contain the same material as the first adhesive layer (AL1). For example, the fourth adhesive layer (AL4) may contain a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent.

[0088] The fifth adhesive layer (AL5) may be interposed between the barrier layer (BL) and the first plate (P1). Specifically, the fifth adhesive layer (AL5) may be in direct contact with the barrier layer (BL) and the first plate (P1). Accordingly, the fifth adhesive layer (AL5) can attach the first plate (P1) to the barrier layer (BL). The fifth adhesive layer (AL5) may contain the same material as the first adhesive layer (AL1). For example, the fifth adhesive layer (AL5) may contain a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent.

[0089] Meanwhile, the display device (10) may further include a plate adhesive layer (PAL). The plate adhesive layer (PAL) may be interposed between the first plate (P1) and the second plate (P2). In other words, the plate adhesive layer (PAL) may attach the second plate (P2) to the first plate (P1). The plate adhesive layer (PAL) may include an adhesive member, such as an optically transparent adhesive (OCA) or a pressure-sensitive adhesive (PSA).

[0090] In one embodiment, the display device (10) may further include a waterproof layer (WP). The waterproof layer (WP) may be disposed on the outside of the second plate (P2) and the cushion layer (CL). The waterproof layer (WP) may block or absorb moisture entering from the outside of the display device (10), thereby preventing or reducing damage to the components of the display device (10) caused by moisture. In one embodiment, the waterproof layer (WP) may include tape and / or a sponge.

[0091] FIG. 6 is an equivalent circuit diagram of a pixel circuit (PC) included in the display panel (DP) of FIG. 5. The pixel circuit (PC) may be electrically connected to a display element, and the display element may correspond to a pixel (PX). In FIG. 6, an organic light-emitting diode (OLED) is shown as the display element. In one embodiment, the display element may emit red light, green light, or blue light.

[0092] The pixel circuit (PC) may include a first transistor (T1), a second transistor (T2), and a storage capacitor (Cst). The second transistor (T2) is a switching transistor connected to a scan line (SL) and a data line (DL), and is turned on by a switching signal input from the scan line (SL) to transmit a data signal input from the data line (DL) to the first transistor (T1). One end of the storage capacitor (Cst) is electrically connected to the second transistor (T2) and the other end is electrically connected to the driving voltage line (PL), and can store a voltage corresponding to the difference between the voltage received from the second transistor (T2) and the driving power supply voltage (ELVDD) supplied to the driving voltage line (PL).

[0093] The first transistor (T1) is a driving transistor and is connected to the driving voltage line (PL) and the storage capacitor (Cst), and can control the magnitude of the driving current flowing from the driving voltage line (PL) to the organic light-emitting diode (OLED) in correspondence with the voltage value stored in the storage capacitor (Cst). The organic light-emitting diode (OLED) can emit light having a predetermined brightness by the driving current. The counter electrode (313, see FIG. 7) of the organic light-emitting diode (OLED) can receive an electrode power supply voltage (ELVSS).

[0094] FIG. 6 illustrates a pixel circuit (PC) comprising two transistors and one storage capacitor, but the present invention is not limited thereto. For example, the number of transistors or the number of storage capacitors may vary depending on the design of the pixel circuit (PC).

[0095] FIG. 7 is a cross-sectional view schematically illustrating a cross section taken along the line II-II' of the display panel (DP) of FIG. 5. As shown in FIG. 7, the display panel (DP) may include a substrate (100), a pixel circuit layer (200), a display element layer (300), and an encapsulation layer (400).

[0096] The substrate (100) may comprise glass, metal, or polymer resin. The substrate (100) needs to have flexible or bendable properties. In this case, the substrate (100) may comprise a polymer resin such as, for example, polyethersulphone, polyacrylate, polyetherimide, polyethylenenaphthalate, polyethyleneterephthalate, polyphenylenesulfide, polyarylate, polyimide, polycarbonate, or cellulose acetate propionate. Of course, the substrate (100) may comprise two layers containing such polymer resin and a silicon oxide (SiO₂) interposed between the layers. X ), silicon nitride (SiN X ), silicon oxynitride (SiO₂ X N Y Various modifications are possible, such as having a multilayer structure including a barrier layer containing inorganic materials (e.g., ) etc.).

[0097] A pixel circuit layer (200) may be disposed on a substrate (100). The pixel circuit layer (200) may include a transistor (TFT), an inorganic insulating layer (IIL), and an organic insulating layer (OIL). The transistor (TFT) may include a semiconductor layer (Act), a gate electrode (GE), a source electrode (SE), and a drain electrode (DE). The inorganic insulating layer (IIL) may include a gate insulating layer (IIL1), a first interlayer insulating layer (IIL2), and a second interlayer insulating layer (IIL3). For convenience of illustration, one transistor (TFT) is shown in FIG. 7, and this transistor (TFT) may correspond to the first transistor (T1, see FIG. 6) described above.

[0098] A semiconductor layer (Act) may be disposed on a substrate (100). The semiconductor layer (Act) may include polysilicon. Alternatively, the semiconductor layer (Act) may include amorphous silicon, an oxide semiconductor, an organic semiconductor, etc. In one embodiment, the semiconductor layer (Act) may include a channel region and a source region and a drain region disposed on both sides of the channel region, respectively.

[0099] The gate insulating layer (IIL1) can be disposed on the semiconductor layer (Act) and the substrate (100). The gate insulating layer (IIL1) is silicon oxide (SiO₂). X ), silicon nitride (SiN X ) or silicon oxynitride (SiO₂ X N Y It may include inorganic insulating materials such as ). For example, the gate insulating layer (IIL1) may have a single-layer or multi-layer structure containing the aforementioned material. An insulating layer containing such inorganic insulating materials may be formed through methods such as chemical vapor deposition. This is also true for the embodiments and variations thereof described below.

[0100] In FIG. 7, the gate insulating layer (IIL1) is shown having a shape corresponding to the entire surface of the substrate (100) and having a structure in which contact holes are formed in a predetermined portion, but the present invention is not limited thereto. For example, the gate insulating layer (IIL1) may be patterned in the same shape as the gate electrode (GE).

[0101] The gate electrode (GE) may be disposed on the gate insulating layer (IIL1). That is, the gate insulating layer (IIL1) is interposed between the semiconductor layer (Act) and the gate electrode (GE), thereby ensuring insulation between the semiconductor layer (Act) and the gate electrode (GE). The gate electrode (GE) may overlap with the channel region of the semiconductor layer (Act). The gate electrode (GE) may include a low-resistance metal material. In one embodiment, the gate electrode (GE) may include a conductive material including molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), etc., and may have a single-layer or multi-layer structure including such a conductive material.

[0102] The first interlayer insulating layer (IIL2) may be disposed on the gate electrode (GE) and the gate insulating layer (IIL1). The first interlayer insulating layer (IIL2) is silicon oxide (SiO₂). X ), silicon nitride (SiN X ) or silicon oxynitride (SiO₂ X N Y It may include inorganic insulating materials such as ). For example, the first interlayer insulating layer (IIL2) may have a single layer or multilayer structure including the aforementioned material.

[0103] The source electrode (SE) and the drain electrode (DE) may be disposed on the first interlayer insulating layer (IIL2). Each of the source electrode (SE) and the drain electrode (DE) may be connected to the semiconductor layer (Act) through a contact hole formed in the gate insulating layer (IIL1) and the first interlayer insulating layer (IIL2). At least one of the source electrode (SE) and the drain electrode (DE) may include a conductive material including molybdenum (Mo), aluminum (Al), copper (Cu), or titanium (Ti), and may have a single-layer or multilayer structure including such conductive material. In one embodiment, at least one of the source electrode (SE) and the drain electrode (DE) may have a multilayer structure of Ti / Al / Ti.

[0104] Of course, the present invention is not limited thereto. For example, a transistor (TFT) may be provided with only one of a source electrode (SE) and a drain electrode (DE), or may not be provided with either. For example, one transistor (TFT) may not have a drain electrode (DE), and another transistor (TFT) connected to this transistor (TFT) may not have a source electrode (SE), and the semiconductor layers (Act) of these two transistors may be connected to each other. Such a connection structure can produce the same effect as when one transistor (TFT) has a source electrode (SE) and another transistor (TFT) has a drain electrode (DE), and the source electrode (SE) of the one transistor (TFT) is connected to the drain electrode (DE) of the other transistor (TFT).

[0105] The second interlayer insulating layer (IIL3) may be disposed on the source electrode (SE), the drain electrode (DE), and the first interlayer insulating layer (IIL2). The second interlayer insulating layer (IIL3) is silicon oxide (SiO₂). X ), silicon nitride (SiN X ) or silicon oxynitride (SiO₂ X N Y It may include inorganic insulating materials such as ). For example, the second interlayer insulating layer (IIL3) may have a single layer or multilayer structure including the aforementioned material.

[0106] An organic insulating layer (OIL) may be disposed on the second interlayer insulating layer (IIL3). The organic insulating layer (OIL) may serve to generally flatten the upper surface of the pixel circuit layer (200). This organic insulating layer (OIL) may include organic materials such as, for example, acrylic, BCB (Benzocyclobutene), or HMDSO (hexamethyldisiloxane). Although the organic insulating layer (OIL) is shown as a single layer in FIG. 7, various variations are possible, such as being multilayer.

[0107] The display element layer (300) may be disposed on the pixel circuit layer (200). The display element layer (300) may include a display element (310) and a pixel defining layer (320). The display element (310) may be electrically connected to a transistor (TFT). The display element (310) may be, for example, an organic light-emitting diode having a pixel electrode (311), a counter electrode (313), and a light-emitting layer (312) interposed between them. That the display element (310) is electrically connected to the transistor (TFT) can be understood as the pixel electrode (311) of the organic light-emitting diode being electrically connected to the transistor (TFT).

[0108] The pixel electrode (311) can be electrically connected to a transistor (TFT) by contacting either the source electrode (SE) or the drain electrode (DE) through a contact hole formed in the second interlayer insulating layer (IIL3) and the organic insulating layer (OIL). The pixel electrode (311) may include a conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO), or aluminum zinc oxide (AZO). In another embodiment, the pixel electrode (311) may include a reflective film comprising silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), or a compound thereof. In another embodiment, the pixel electrode (311) may further include a film formed of ITO, IZO, ZnO, or In2O3 above and below the aforementioned reflective film.

[0109] The pixel defining film (320) may cover the edge of the pixel electrode (311). The pixel defining film (320) may have a pixel opening, and the pixel opening may overlap with the pixel electrode (311). For example, the pixel opening may expose the central part of the pixel electrode (311) of the display element (310), and at least a portion of the light-emitting layer (312) of the display element (310) may be located within the pixel opening. The light-emitting region of the light emitted from the display element (310) may be defined by the pixel opening.

[0110] Additionally, as illustrated in FIG. 7, the pixel defining film (320) can increase the distance between the edge of the pixel electrode (311) and the opposing electrode (313) above the pixel electrode (311). This prevents the occurrence of arcs, etc., at the edge of the pixel electrode (311). Such a pixel defining film (320) may include an organic insulating material such as polyimide or HMDSO (hexamethyldisiloxane). In some embodiments, the pixel defining film (320) may include a light-blocking material.

[0111] The counter electrode (313) can be placed on the pixel electrode (311). The counter electrode (313) can be integrally provided over the entire surface of the substrate (100), and accordingly, can be commonly provided in a plurality of display elements (310). That is, the counter electrode (313) can be integrally provided over a plurality of display elements (310). Accordingly, the counter electrode (313) can correspond to a plurality of pixel electrodes (311). The counter electrode (313) may include a light-transmitting conductive layer formed of ITO, In2O3, or IZO, and may also include a semi-transparent film containing a metal such as Al or Ag. For example, the counter electrode (313) may be a semi-transparent film containing Mg or Ag.

[0112] A light-emitting layer (312) capable of emitting light may be interposed between the pixel electrode (311) and the counter electrode (313). The light-emitting layer (312) may emit red light, green light, or blue light. The light-emitting layer (312) may include a polymer or low-molecular-weight organic material capable of emitting light of a predetermined color (red, green, or blue). For example, the light-emitting layer (312) may include polymer materials such as PPV (polyphenylene vinylene) and polyfluorene. Such a light-emitting layer (312) may be formed by screen printing, inkjet printing, or laser-induced thermal imaging (LITI). However, the present invention is not limited thereto.

[0113] In one embodiment, a functional layer (not shown) may be disposed below and above the light-emitting layer (312). The functional layer may include a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and / or an electron injection layer (EIL). This functional layer may be integral across a plurality of pixel electrodes (311) or may be patterned to correspond to each of the plurality of pixel electrodes (311).

[0114] Since these marking elements (310) can be easily damaged by moisture or oxygen from the outside, a bag layer (400) can cover these marking elements (310) to protect them. The bag layer (400) may include a first inorganic bag layer (410), an organic bag layer (420), and a second inorganic bag layer (430), as shown in FIG. 7.

[0115] The first inorganic encapsulation layer (410) covers the counter electrode (313) and is made of silicon oxide (SiO₂). X ), silicon nitride (SiN X ) and / or silicon oxynitride (SiO₂) X NY It may include, etc. Of course, other layers such as a capping layer may be interposed between the first inorganic sealing layer (410) and the counter electrode (313) as needed. Since this first inorganic sealing layer (410) is formed along the structure below it, its upper surface may not be flat as shown in FIG. 7. The organic sealing layer (420) covers this first inorganic sealing layer (410), and unlike the first inorganic sealing layer (410), its upper surface may be made to be approximately flat. This organic encapsulation layer (420) may comprise one or more materials selected from the group consisting of polyethyleneterephthalate, polyethylenenaphthalate, polycarbonate, polyimide, polyethylenesulfonate, polyoxymethylene, polyarylate, and hexamethyldisiloxane. The second inorganic encapsulation layer (430) covers the organic encapsulation layer (420) and is made of silicon oxide (SiO₂). X ), silicon nitride (SiN X ) and / or silicon oxynitride (SiO₂) X N Y It may include ) etc.

[0116] In this way, the sealing layer (400) includes a first inorganic sealing layer (410), an organic sealing layer (420), and a second inorganic sealing layer (430). Through this multilayer structure, even if a crack occurs within the sealing layer (400), such cracks can be prevented from connecting between the first inorganic sealing layer (410) and the organic sealing layer (420), or between the organic sealing layer (420) and the second inorganic sealing layer (430). This prevents or minimizes the formation of a path for moisture or oxygen from the outside to penetrate into the display panel (DP).

[0117] Hereinafter, an adhesive composition for forming a first adhesive layer (AL1) is described in detail. As previously stated, the first adhesive layer (AL1) may be a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent. Such an adhesive composition may be an acrylate-based adhesive composition. In this specification, an acrylate-based adhesive composition refers to an adhesive composition comprising acrylate and / or derivatives of acrylate.

[0118] The first acrylate-based compound may include an acryloyl group. Specifically, the first acrylate-based compound may be a monomer and / or polymer having one acryloyl group at the end of the molecule. For example, the first acrylate-based compound may include a first acrylate-based monomer having an acryloyl group and a polymer formed by polymerizing such first acrylate-based monomer. The first acrylate-based monomer may include at least one of 2-ethylhexyl acrylate, butyl acrylate, and ethyl acrylate.

[0119] The second acrylate-based compound includes an acryloyl group, but may differ from the first acrylate-based compound. Specifically, the second acrylate-based compound has one acryloyl group at the end of the molecule, and the second acrylate-based compound may further include at least one of a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group. That is, the second acrylate-based compound may include at least one of a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group, and an acryloyl group. Since the second acrylate-based compound further includes at least one of a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group, the adhesive strength of the cured product of the adhesive composition may be improved.

[0120] For example, the second acrylate-based compound may include at least one of acrylic acid, carboxy ethyl acrylate, carboxy ethyl acrylate, carboxy butyl acrylate, hydroxy ethyl acrylate, n-hydroxy propyl acrylate, n-hydroxy butyl acrylate, acrylamide, n-diethyl acrylamide, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminopropyl acrylate, and glycidyl acrylate.

[0121] Carboxy ethyl acrylate may be 3-(acryloyloxy)propanoic acid. Carboxy propyl acrylate may be 4-(acryloyloxy)butanoic acid. Carboxy butyl acrylate may be 5-(acryloyloxy)pentanoic acid.

[0122] Hydroxy ethyl acrylate may be 2-hydroxyethyl acrylate. n-hydroxy propyl acrylate may be 3-hydroxypropyl acrylate. n-hydroxy butyl acrylate may be 4-hydroxybutyl acrylate.

[0123] n-diethyl acrylamide may be N,N-diethylacrylamide. Dimethylaminomethyl acrylate may be 2-(dimethylamino)ethyl acrylate. Diethylaminoethyl acrylate may be 2-(diethylamino)ethyl acrylate. Dimethylaminopropyl acrylate may be 3-(dimethylamino)propyl acrylate.

[0124] Siloxane-based compounds may include siloxane groups. A siloxane group refers to a functional group consisting of two silicon atoms (e.g., Si-O-Si) bonded to one oxygen atom. Siloxane-based compounds may be organosilicon compounds containing such siloxane groups, such as organosiloxane compounds. Siloxane-based compounds can improve the impact resistance of a display device containing a cured adhesive composition without excessively increasing the repulsive force of the display device containing the cured adhesive composition.

[0125] In addition, the portion derived from the siloxane-based compound in the cured product of the adhesive composition can form hydrogen bonds with the portion derived from the second acrylate-based compound in the cured product of the adhesive composition. Therefore, the dispersibility of the portion derived from the siloxane-based compound in the cured product of the adhesive composition can be improved.

[0126] For example, a siloxane-based compound may include at least one of polydimethylsiloxane, polymethylphenylsiloxane, and polydiphenylsiloxane.

[0127] The crosslinking agent may include an acryloyl group, but may differ from the first acrylate-based compound and the second acrylate-based compound. Specifically, the crosslinking agent may have at least two acryloyl groups. For example, the crosslinking agent may include at least one of 1,6-hexanediol diacrylate and dipentaerythritol hexaacrylate.

[0128] In one embodiment, the adhesive composition may comprise 70 wt% or more and 80 wt% or less of a first acrylate-based compound, 10 wt% or more and 20 wt% or less of a second acrylate-based compound, 1 wt% or more and 10 wt% or less of a siloxane-based compound, and 0.1 wt% or more and 3 wt% or less of a crosslinking agent. In this specification, the content of each component included in the adhesive composition may be a value based on the total sum of the weight of the first acrylate-based compound, the weight of the second acrylate-based compound, the weight of the siloxane-based compound, and the weight of the crosslinking agent. In other words, the content of each component included in the adhesive composition may be a value based on the premise that the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent is 100 wt%.

[0129] That is, when the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent included in the adhesive composition is 100 wt%, the adhesive composition may contain 70 wt% or more and 80 wt% or less of the first acrylate-based compound, 10 wt% or more and 20 wt% or less of the second acrylate-based compound, 1 wt% or more and 10 wt% or less of the siloxane-based compound, and 0.1 wt% or more and 3 wt% or less of the crosslinking agent. Meanwhile, the content of each component included in the adhesive composition may be the result of analysis by nuclear magnetic resonance spectroscopy (NMR spectroscopy). Nuclear magnetic resonance spectroscopy is a method of measuring a sample to be analyzed using RF (radio frequency) resonance that causes a rotational transition of atomic nuclei.

[0130] A first adhesive layer (AL1) can be formed by curing such an adhesive composition. Specifically, the first adhesive layer (AL1) can be formed by photocuring the adhesive composition. For example, the adhesive composition can be applied onto a display panel (DP) using a method such as slit coating, spin coating, or inkjet printing, and the first adhesive layer (AL1) can be formed by irradiating the applied adhesive composition with ultraviolet light. Specifically, ultraviolet light having a light intensity of 1,000 mJ / cm² to 3,000 mJ / cm² can be irradiated onto the adhesive composition applied onto the display panel (DP). For example, ultraviolet light having a light intensity of 2,000 mJ / cm² can be irradiated onto the adhesive composition applied onto the display panel (DP). For photocuring, ultraviolet light having a wavelength of about 300 nm to about 400 nm can be used. An LED or a metal halide can be used as the ultraviolet source. However, the present invention is not necessarily limited thereto.

[0131] In this case, the first adhesive layer (AL1) can cause the display device (10) to have a low repulsion force. In this specification, repulsion force refers to the force that causes the display device (10) to unfold when the display device (10) is folded. That is, if the repulsion force of the display device (10) is low, the display device (10) may be easy to fold. Conversely, if the repulsion force of the display device (10) is high, the display device (10) may not be easy to fold.

[0132] Meanwhile, the display device (10) including the first adhesive layer (AL1) may have excellent impact resistance. Since the first adhesive layer (AL1) includes a cured product of the adhesive composition, the first adhesive layer (AL1) may include a siloxane-based compound. Generally, to improve the impact resistance of the display device, the display device includes an adhesive layer in which silica particles are dispersed. Similar to silica particles, the siloxane-based compound of the first adhesive layer (AL1) can improve the impact resistance of the display device (10). Therefore, the display device (10) including the first adhesive layer (AL1) may have excellent impact resistance. Accordingly, the display device (10) according to the present embodiment can be easily folded and may have excellent impact resistance.

[0133] In one embodiment, the adhesive composition may further include a photopolymerization initiator. The photopolymerization initiator can serve to promote the photocuring of the adhesive composition. For example, the photopolymerization initiator may be benzophenone or its derivative, anthraquinone or its derivative, or benzoin or its derivative. However, the present invention is not necessarily limited thereto, and any material commonly used as a photopolymerization initiator may be used.

[0134] <Experimental Example>

[0135] The present invention will be explained in more detail below through experimental examples. However, the following experimental examples are intended to explain the present invention more specifically, and the scope of the present invention is not limited by the following experimental examples. The following experimental examples may be appropriately modified or changed by those skilled in the art within the scope of the present invention. Meanwhile, the following experimental examples differ only in the components and content of the adhesive composition of the first adhesive layer, while other conditions are the same.

[0136] Table 1 shows the components and content of an adhesive composition for forming a first adhesive layer of a display device according to one embodiment of the present invention. Specifically, Table 1 shows the components and content of the adhesive composition of the first adhesive layer of Example 1.

[0137] ingredient Content (wt%) 2-ethylhexyl acrylate 78 acrylic acid 16 polydimethylsiloxane 5 1,6-Hexanediol diacrylate 1

[0138] Referring to Table 1, the adhesive composition of the first adhesive layer of Example 1 comprises a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent. Specifically, the adhesive composition of the first adhesive layer of Example 1 comprises 2-ethylhexyl acrylate as the first acrylate-based compound and acrylic acid as the second acrylate-based compound. The adhesive composition of the first adhesive layer of Example 1 comprises polydimethylsiloxane as the siloxane-based compound and 1,6-hexanediol diacrylate as the crosslinking agent. Specifically, the adhesive composition of the first adhesive layer of Example 1 comprises 78 wt% 2-ethylhexyl acrylate, 16 wt% acrylic acid, 5 wt% polydimethylsiloxane, and 1 wt% 1,6-hexanediol diacrylate.

[0139] Referring to Table 1, the adhesive composition of the first adhesive layer of Example 1 comprises a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent. Specifically, the adhesive composition of the first adhesive layer of Example 1 comprises 2-ethylhexyl acrylate as the first acrylate-based compound and acrylic acid as the second acrylate-based compound. The adhesive composition of the first adhesive layer of Example 1 comprises polydimethylsiloxane as the siloxane-based compound and 1,6-hexanediol diacrylate as the crosslinking agent. Specifically, the adhesive composition of the first adhesive layer of Example 1 comprises 78 wt% 2-ethylhexyl acrylate, 16 wt% acrylic acid, 5 wt% polydimethylsiloxane, and 1 wt% 1,6-hexanediol diacrylate.

[0140] Table 2 shows the components and content of the adhesive composition of the first adhesive layer of the display device according to the comparative example. Specifically, Table 2 shows the components and content of the adhesive composition of the first adhesive layer of Comparative Example 1.

[0141] ingredient Content (wt%) 2-ethylhexyl acrylate 92 silica 7 1,6-Hexanediol diacrylate 1

[0142] Referring to Table 2, the adhesive composition of the first adhesive layer of Comparative Example 1 includes a first acrylate-based compound and a crosslinking agent, but does not include a second acrylate-based compound and a siloxane-based compound. However, the adhesive composition of the first adhesive layer of Comparative Example 1 further includes silica particles. The silica included in the adhesive composition of the first adhesive layer of Comparative Example 1 has a diameter of about 10 nm or more and about 100 nm or less. That is, the adhesive composition of the first adhesive layer of Comparative Example 1 includes 2-ethylhexyl acrylate as the first acrylate-based compound and 1,6-hexanediol diacrylate as the crosslinking agent. The adhesive composition of the first adhesive layer of Comparative Example 1 includes silica particles. Specifically, the adhesive composition of the first adhesive layer of Comparative Example 1 comprises 92 wt% 2-ethylhexyl acrylate, 7 wt% silica, and 1 wt% 1,6-hexanediol diacrylate.

[0143] Tables 3 and 4 show the repulsive forces of display devices according to an embodiment and a comparative example of the present invention. Specifically, the first adhesive layer of Example 1 was prepared by photocuring an adhesive composition having the components and content of Table 1, and the first adhesive layer of Comparative Example 1 was prepared by photocuring an adhesive composition having the components and content of Table 2. Specifically, ultraviolet light having a light intensity of 2,000 mJ / cm² was irradiated onto the adhesive composition applied to the display panel for 10 seconds. Ultraviolet light with a wavelength of approximately 300 nm was used for photocuring, and an LED was used as the ultraviolet source.

[0144] Example 1 and Comparative Example 1 differ only in the first adhesive layer, and all other components other than the first adhesive layer are identical. The repulsion force was measured by folding a display device having the same structure as described above with reference to FIG. 4 to the maximum using a jig (e.g., folding so that the first non-folding area is parallel to the second non-folding area), and then measuring the degree to which the display device attempts to unfold. The repulsion force was measured at different temperatures, at 25 ℃ and -10 ℃, and the unit of the repulsion force is Newton (N). Meanwhile, Table 3 shows the repulsion force when the thickness of the first adhesive layer is 50 μm, and Table 4 shows the repulsion force when the thickness of the first adhesive layer is 75 μm.

[0145] Comparative Example 1 Example 1 25 ℃ 1.73 N 1.66 N -10 ℃ 3.22 N 3.08 N

[0146] Comparative Example 1 Example 1 25 ℃ 2.04 N 1.87 N -10 ℃ 3.35 N 3.24 N

[0147] Referring to Table 3, when the thickness of the first adhesive layer is 50 μm, Comparative Example 1 has a repulsive force of 1.73 N at 25 ℃ and 3.22 N at -10 ℃. When the thickness of the first adhesive layer is 50 μm, Example 1 has a repulsive force of 1.66 N at 25 ℃ and 3.08 N at -10 ℃. Referring to Table 4, when the thickness of the first adhesive layer is 75 μm, Comparative Example 1 has a repulsive force of 2.04 N at 25 ℃ and 3.35 N at -10 ℃. When the thickness of the first adhesive layer is 75 μm, Example 1 has a repulsive force of 1.87 N at 25 ℃ and 3.24 N at -10 ℃. That is, Example 1 has a lower repulsion force than Comparative Example 1.

[0148] FIG. 8 is a graph showing the ball drop evaluation results of display devices according to an embodiment and a comparative example of the present invention, and FIG. 9 is a graph showing the pen drop evaluation results of display devices according to an embodiment and a comparative example of the present invention. Example 1 and Comparative Example 1 of FIG. 8 and FIG. 9 are identical to Example 1 and Comparative Example 1 of Table 3 and Table 4. That is, Example 1 and Comparative Example 1 of FIG. 8 and FIG. 9 have the same structure as the structure described above with reference to FIG. 4, but differ only in the first adhesive layer, and all other components other than the first adhesive layer are identical.

[0149] The ball drop evaluation was performed by dropping the same ball (e.g., a 1g metal ball) vertically free-falling over Example 1 and Comparative Example 1, and measuring the height at which Example 1 and Comparative Example 1, respectively, are damaged by the ball. That is, the ball drop evaluation results in FIG. 8 represent the height at which Example 1 and Comparative Example 1, respectively, are damaged by the ball. The pen drop evaluation was performed by dropping the same pen (e.g., a 5.8g Société Bic Fine Bic pen) vertically free-falling over Example 1 and Comparative Example 1, and measuring the height at which Example 1 and Comparative Example 1, respectively, are damaged by the pen. That is, the pen drop evaluation results in FIG. 9 represent the height at which Example 1 and Comparative Example 1, respectively, are damaged by the pen. The drop height on the vertical axis of FIG. 8 and FIG. 9 represents the height at which the ball or pen is dropped, and the unit is cm.

[0150] Referring to FIG. 8, in the ball drop evaluation, the minimum height at which Comparative Example 1 is damaged by a ball was 3 cm, and the average height at which Comparative Example 1 is damaged by a ball was 3.7 cm. In the ball drop evaluation, the minimum height at which Example 1 is damaged by a ball was 3 cm, and the average height at which Example 1 is damaged by a ball was 4 cm. Referring to FIG. 9, in the pen drop evaluation, the minimum height at which Comparative Example 1 is damaged by a pen was 4 cm, and the average height at which Comparative Example 1 is damaged by a pen was 4.3 cm. In the pen drop evaluation, the minimum height at which Example 1 is damaged by a pen was 4 cm, and the average height at which Example 1 is damaged by a pen was 4.7 cm. That is, Example 1 has impact resistance similar to that of Comparative Example 1.

[0151] Accordingly, the display device (10) of the present embodiment can be easily folded and has excellent impact resistance. The above description regarding the effect when the first adhesive layer (AL1) includes a cured product of the adhesive composition may also be applied to the effect when the second adhesive layer (AL2), the third adhesive layer (AL3), the fourth adhesive layer (AL4), or the fifth adhesive layer (AL5) includes a cured product of the adhesive composition. Therefore, redundant descriptions in this regard are omitted. Meanwhile, although FIG. 4 is illustrated as the first adhesive layer (AL1) being in direct contact with the display panel (DP), the present invention is not limited thereto.

[0152] FIG. 10 is a cross-sectional view schematically illustrating a display device (10) according to an embodiment of the present invention. Since the display device (10) according to the present embodiment is similar to the display device (10) described above with reference to FIG. 2 to 7, the following description will focus on the differences from the display device (10) described above with reference to FIG. 2 to 7. In FIG. 10, reference numerals identical to those in FIG. 2 to 7 denote identical components, so redundant descriptions will be omitted.

[0153] With reference to FIGS. 2 to 7, the display device (10) described above may include a display panel (DP), a cover window (CW), a window protection layer (CWP), a lower protection layer (LP), a barrier layer (BL), a first plate (P1), a second plate (P2), a cushion layer (CL), and an insulating layer (IL). Additionally, with reference to FIGS. 2 to 7, the display device (10) described above may include a first adhesive layer (AL1), a second adhesive layer (AL2), a third adhesive layer (AL3), a fourth adhesive layer (AL4), and a fifth adhesive layer (AL5), and may include a plate adhesive layer (PAL) and a waterproof layer (WP).

[0154] As illustrated in FIG. 10, the display device (10) according to the present embodiment may also include a display panel (DP), a cover window (CW), a window protection layer (CWP), a lower protection layer (LP), a barrier layer (BL), a first plate (P1), a second plate (P2), a cushion layer (CL), and an insulating layer (IL). Additionally, the display device (10) according to the present embodiment may also include a first adhesive layer (AL1), a second adhesive layer (AL2), a third adhesive layer (AL3), a fourth adhesive layer (AL4), and a fifth adhesive layer (AL5), and may include a plate adhesive layer (PAL) and a waterproof layer (WP).

[0155] However, as illustrated in FIG. 10, the display device (10) according to the present embodiment may further include an upper protective layer (UP) and a sixth adhesive layer (AL6). The upper protective layer (UP) may be interposed between the display panel (DP) and the cover window (CW). The upper protective layer (UP) may protect the display panel (DP). The upper protective layer (UP) may absorb external shocks applied to the upper surface (in the +z direction) of the display panel (DP). The upper protective layer (UP) may be a plastic film containing a polymer resin. For example, the upper protective layer (UP) may include at least one of the following polymer resins: polyethyleneterephthalate (PET), poly(butylene terephthalate) (PBT), polycarbonate (PC), polyethylene naphthalate (PEN), polystyrene (PS), polymethylmethacrylate (PMMA), polyvinyl chloride (PVC), polyethersulfone (PES), polypropylene (PP), and polyamide (PA).

[0156] In this case, the sixth adhesive layer (AL6) may be interposed between the upper protective layer (UP) and the display panel (DP), and the first adhesive layer (AL1) may be interposed between the cover window (CW) and the upper protective layer (UP). Specifically, the sixth adhesive layer (AL6) may come into direct contact with the upper protective layer (UP) and the display panel (DP). Accordingly, the sixth adhesive layer (AL6) can attach the upper protective layer (UP) to the display panel (DP). In this case, the first adhesive layer (AL1) may come into direct contact with the upper protective layer (UP) while also coming into direct contact with the cover window (CW). That is, by attaching the cover window (CW) to the upper protective layer (UP), the first adhesive layer (AL1) can attach the cover window (CW) to the display panel (DP) to which the upper protective layer (UP) is attached.

[0157] The sixth adhesive layer (AL6) may contain the same material as the first adhesive layer (AL1). For example, the sixth adhesive layer (AL6) may contain a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent. The above description regarding the effect when the first adhesive layer (AL1) contains a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent may also apply to the effect when the sixth adhesive layer (AL6) contains a cured product of an adhesive composition comprising a first acrylate-based compound, a second acrylate-based compound, a siloxane-based compound, and a crosslinking agent. Therefore, redundant descriptions regarding this are omitted.

[0158] As such, the present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. Explanation of the symbols

[0159] 1: Electronic device 10: Display device DP: Display panel CW: Cover Window AL1: First adhesive layer 310: Display elements

Claims

Claim 1 An adhesive composition comprising: a first acrylate-based compound comprising an acryloyl group; a second acrylate-based compound different from the first acrylate-based compound, comprising an acryloyl group and at least one of a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group; a siloxane-based compound comprising a siloxane group; and a crosslinking agent. Claim 2 An adhesive composition according to claim 1, wherein, when the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent included in the adhesive composition is 100 wt%, the first acrylate-based compound is included in an amount of 70 wt% or more and 80 wt% or less, the second acrylate-based compound is included in an amount of 10 wt% or more and 20 wt% or less, the siloxane-based compound is included in an amount of 1 wt% or more and 10 wt% or less, and the crosslinking agent is included in an amount of 0.1 wt% or more and 3 wt% or less. Claim 3 An adhesive composition according to claim 2, wherein the second acrylate-based compound comprises at least one of acrylic acid, carboxyethyl acrylate, carboxypropyl acrylate, carboxybutyl acrylate, hydroxyethyl acrylate, n-hydroxypropyl acrylate, n-hydroxybutyl acrylate, acrylamide, n-diethyl acrylamide, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminopropyl acrylate, and glycidyl acrylate, and the siloxane-based compound comprises at least one of polydimethylsiloxane, polymethylphenylsiloxane, and polydiphenylsiloxane. Claim 4 An adhesive composition according to claim 2, wherein the first acrylate-based compound comprises a first acrylate-based monomer having an acryloyl group and a polymer formed by polymerizing the first acrylate-based monomer, and the first acrylate-based monomer comprises at least one of 2-ethylhexyl acrylate, butyl acrylate, and ethyl acrylate. Claim 5 An adhesive composition according to claim 2, wherein the crosslinking agent comprises at least one of 1,6-hexanediol diacrylate and dipentaerythritol hexaacrylate. Claim 6 A display device comprising: a display panel including a display element; a cover window disposed on the display panel; and a first adhesive layer interposed between the display panel and the cover window; wherein the first adhesive layer comprises a cured product of an adhesive composition, and the adhesive composition comprises: a first acrylate-based compound including an acryloyl group; a second acrylate-based compound different from the first acrylate-based compound and including at least one of an acryloyl group, a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group; a siloxane-based compound including a siloxane group; and a crosslinking agent. Claim 7 A display device according to claim 6, wherein, when the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent included in the adhesive composition is 100 wt%, the adhesive composition comprises the first acrylate-based compound in an amount of 70 wt% or more and 80 wt% or less, the adhesive composition comprises the second acrylate-based compound in an amount of 10 wt% or more and 20 wt% or less, the adhesive composition comprises the siloxane-based compound in an amount of 1 wt% or more and 10 wt% or less, and the adhesive composition comprises the crosslinking agent in an amount of 0.1 wt% or more and 3 wt% or less. Claim 8 A display device according to claim 7, wherein the second acrylate-based compound comprises at least one of acrylic acid, carboxyethyl acrylate, carboxypropyl acrylate, carboxybutyl acrylate, hydroxyethyl acrylate, n-hydroxypropyl acrylate, n-hydroxybutyl acrylate, acrylamide, n-diethyl acrylamide, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminopropyl acrylate, and glycidyl acrylate, and the siloxane-based compound comprises at least one of polydimethylsiloxane, polymethylphenylsiloxane, and polydiphenylsiloxane. Claim 9 A display device according to claim 7, wherein the first acrylate-based compound comprises a first acrylate-based monomer having an acryloyl group and a polymer formed by polymerizing the first acrylate-based monomer, and the first acrylate-based monomer comprises at least one of 2-ethylhexyl acrylate, butyl acrylate, and ethyl acrylate. Claim 10 A display device according to claim 7, wherein the crosslinking agent comprises at least one of 1,6-hexanediol diacrylate and dipentaerythritol hexaacrylate. Claim 11 A display device according to claim 6, further comprising: a window protection layer disposed on the cover window; and a second adhesive layer interposed between the cover window and the window protection layer, wherein the second adhesive layer comprises the same material as the first adhesive layer. Claim 12 A display device according to claim 6, further comprising: a lower protective layer disposed below the display panel; a barrier layer disposed below the lower protective layer; a support layer disposed below the barrier layer; and a third adhesive layer interposed between the display panel and the lower protective layer, wherein the third adhesive layer comprises the same material as the first adhesive layer. Claim 13 A display device according to claim 12, further comprising a fourth adhesive layer interposed between the lower protective layer and the barrier layer, wherein the fourth adhesive layer comprises the same material as the first adhesive layer. Claim 14 A display device according to claim 12, further comprising a fifth adhesive layer interposed between the barrier layer and the support layer, wherein the fifth adhesive layer comprises the same material as the first adhesive layer. Claim 15 A display device according to claim 6, further comprising: an upper protective layer interposed between the display panel and the cover window; and a sixth adhesive layer interposed between the display panel and the upper protective layer, wherein the first adhesive layer is interposed between the upper protective layer and the cover window, and the sixth adhesive layer comprises the same material as the first adhesive layer. Claim 16 In claim 6, the display device comprises a first non-folding area, a second non-folding area, and a foldable area between the first non-folding area and the second non-folding area. Claim 17 In paragraph 16, a display device that can be folded so that a part of one side of the display device and another part of the one side face each other. Claim 18 An electronic device comprising: a processor; and a display device controlled by said processor; wherein the display device comprises: a display panel including a display element; a cover window disposed on said display panel; and a first adhesive layer interposed between said display panel and said cover window; wherein the first adhesive layer comprises a cured product of an adhesive composition, and the adhesive composition comprises: a first acrylate-based compound including an acryloyl group; a second acrylate-based compound different from said first acrylate-based compound and including at least one of an acryloyl group, a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group; a siloxane-based compound including a siloxane group; and a crosslinking agent. Claim 19 An electronic device according to claim 18, wherein, when the total weight of the first acrylate-based compound, the second acrylate-based compound, the siloxane-based compound, and the crosslinking agent included in the adhesive composition is 100 wt%, the adhesive composition comprises the first acrylate-based compound in an amount of 70 wt% or more and 80 wt% or less, the adhesive composition comprises the second acrylate-based compound in an amount of 10 wt% or more and 20 wt% or less, the adhesive composition comprises the siloxane-based compound in an amount of 1 wt% or more and 10 wt% or less, and the adhesive composition comprises the crosslinking agent in an amount of 0.1 wt% or more and 3 wt% or less. Claim 20 In paragraph 18, the display device comprises a first non-folding area, a second non-folding area, and a foldable area between the first non-folding area and the second non-folding area, and the display device is an electronic device that can be folded such that a part of one side of the display device and another part of the one side face each other.

Images