Resin composition, method for manufacturing a display device, and display device

Abstract

The present invention provides a resin composition exhibiting excellent adhesion and reliability, a display device including an adhesive member made from the resin composition, and a method for manufacturing the same. [Solution] The resin composition contains 5 wt% to 10 wt% of 2-acryloyloxyethyl succinate and 5 wt% to 10 wt% of 4-hydroxybutyl acrylate, based on the total weight of the resin composition.

Description

[Technical Field]

[0001] The present invention relates to a resin composition, a method for manufacturing a display device, and a display device. [Background technology]

[0002] A variety of display devices are being developed for use in multimedia devices such as televisions, mobile phones, tablet computers, navigation systems, and game consoles. In particular, recent developments have focused on display devices that can be folded, bent, or rolled up, incorporating flexible display elements to facilitate portability and improve user convenience.

[0003] In the case of such flexible display devices, each component used must be reliable during folding and bending operations. Furthermore, the adhesive resin used to form the adhesive layer applied to the diverse shapes of the display device must have excellent coating properties for the components of the diverse shapes of the display device. [Overview of the project] [Problems that the invention aims to solve]

[0004] One objective of the present invention is to provide a resin composition that exhibits excellent adhesion and reliability.

[0005] Another objective of the present invention is to provide a method for manufacturing a display device that includes an adhesive member made of a resin composition.

[0006] Another objective of the present invention is to provide a display device that includes an adhesive member made of a resin composition. [Means for solving the problem]

[0007] One embodiment provides a resin composition comprising 5 wt% to 10 wt% of 2-acryloyloxyethyl succinate and 5 wt% to 10 wt% of 4-hydroxybutyl acrylate based on the total weight of the resin composition.

[0008] The resin composition may have a viscosity of 15 mPa·s or more and 25 mPa·s or less at 25°C.

[0009] The resin composition may further contain one or more urethane acrylate oligomers.

[0010] The urethane acrylate oligomer may have a weight-average molecular weight of 10,000 or more and 38,000 or less.

[0011] The resin composition may further contain one or more (meth)acrylate monomers different from the 4-hydroxybutyl acrylate.

[0012] The resin composition may further contain at least one of 2-ethylhexyl acrylate, tetrahydrofurfuryl acrylate, and 2-ethylhexyl diglycol acrylate.

[0013] The resin composition may have a storage modulus at 25°C of 0.01 MPa or more and 0.1 MPa or less after photocuring.

[0014] One embodiment provides a method for manufacturing a display device, comprising the steps of providing a resin composition on a first plate and forming an adhesive member from the resin composition, wherein the resin composition comprises 5 wt% to 10 wt% of 2-acryloyloxyethyl succinate and 5 wt% to 10 wt% of 4-hydroxybutyl acrylate based on the total weight of the resin composition.

[0015] The first plate is defined as having a first region and a second region surrounding the first region, and in the step of providing the resin composition, the resin composition may be provided in the first region with a constant thickness and in the second region with a height difference in the thickness direction.

[0016] The thickness of the resin composition applied to the first region may be lower than the maximum thickness of the resin composition applied to the second region.

[0017] The resin composition applied to the second region may include a peak portion having the maximum thickness from the upper surface of the first plate.

[0018] The horizontal distance from the edge of the first plate coated with the resin composition to the peak portion may be 300 μm or more and 600 μm or less.

[0019] The resin composition may be provided by an inkjet printing method.

[0020] One embodiment provides a display device including a display panel, a window disposed on the display panel, and a polymer derived from the resin composition described above, and including an adhesive member disposed between the display panel and the window.

[0021] The adhesive member may have a storage elastic modulus at 25°C of 0.01 MPa or more and 0.1 MPa or less.

[0022] The adhesive member may have a 180° peel force of 500 gf / 25 mm or more with respect to at least one of a glass substrate and a polymer substrate at a temperature of 25°C.

Advantages of the Invention

[0023] The resin composition of one embodiment can exhibit an appropriate viscosity range that can be applied to a desired shape by an inkjet printing method by including specific components within a specific content range.

[0024] The manufacturing method of a display device of one embodiment can appropriately adjust the film thickness dispersion near the edge of a target substrate by using the resin composition of one embodiment when forming an adhesive member, so that it is possible to join the substrate without an unbonded portion being visually recognized.

[0025] The display device according to one embodiment can exhibit excellent adhesion and elastic modulus by including the adhesive member according to one embodiment. [Brief explanation of the drawing]

[0026] [Figure 1] This is a perspective view of a display device according to one embodiment of the present invention. [Figure 2] This figure shows the folded state of the display device shown in Figure 1. [Figure 3] This is a perspective view of a display device according to one embodiment of the present invention. [Figure 4] This figure shows the folded state of the display device shown in Figure 3. [Figure 5] This is a perspective view of a display device according to one embodiment of the present invention. [Figure 6] This is a disassembled perspective view of a display device according to one embodiment of the present invention. [Figure 7] This is a cross-sectional view of a display device according to one embodiment of the present invention. [Figure 8] This is a cross-sectional view of a display device according to one embodiment of the present invention. [Figure 9] This is a cross-sectional view of a display device according to one embodiment of the present invention. [Figure 10a] This figure schematically shows the steps for manufacturing an adhesive member according to one embodiment. [Figure 10b] This figure schematically shows the steps for manufacturing an adhesive member according to one embodiment. [Figure 10c] This figure schematically shows the steps for manufacturing an adhesive member according to one embodiment. [Figure 10d] This figure schematically shows the steps for manufacturing an adhesive member according to one embodiment. [Figure 11a] This figure schematically illustrates the steps for manufacturing a display device according to one embodiment. [Figure 11b] This figure schematically illustrates the steps for manufacturing a display device according to one embodiment. [Figure 11c] This figure schematically illustrates the steps for manufacturing a display device according to one embodiment. [Figure 11d] This figure schematically illustrates the steps for manufacturing a display device according to one embodiment. [Figure 11e] This figure schematically illustrates the steps for manufacturing a display device according to one embodiment. [Figure 12] This is a cross-sectional view showing an enlarged view of region AA' in Figure 11c. [Modes for carrying out the invention]

[0027] Because the present invention can be modified in various ways and take on various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this should not be understood as limiting the present invention to any particular disclosure, but rather as including all modifications, equivalents, or substitutes that fall within the spirit and technical scope of the present invention.

[0028] In this specification, when a component (or region, layer, part, etc.) is referred to as being "on top of," "connected to," or "joined" another component, it means that it can be directly placed on top of, connected to, or joined to the other component, or that a third component can be placed between them.

[0029] On the other hand, in this application, "directly arranged" may mean that there are no additional layers, films, regions, plates, etc. between one part and another. For example, "directly arranged" may mean that two layers or two members are arranged without using additional members such as adhesive members.

[0030] The same drawing reference numeral indicates the same component. Furthermore, in drawings, the thickness, proportions, and dimensions of components are exaggerated for the sake of effective explanation of the technical content.

[0031] "and / or" includes all combinations of one or more of the related configurations.

[0032] Terms such as "first," "second," etc., are used to describe a variety of components, but the components are not limited to those defined by these terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may also be named the first component. A singular form may include plural expressions unless the context clearly indicates otherwise.

[0033] Furthermore, terms such as "below," "on the lower side," "above," and "on the upper side" are used to describe the relationships of the configuration shown in the drawings. These terms are relative concepts and are described in reference to the directions shown in the drawings. In this specification, "placed on top" may refer not only to the top of any one member but also to the bottom.

[0034] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art in the field to which the present invention pertains. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and, unless interpreted in an ideal or overly formal sense, as expressly defined herein.

[0035] Terms such as “includes” or “possesses” should be understood to indicate the presence of features, figures, steps, actions, components, parts, or combinations thereof described in the specification, without prejudice to the presence or possibility of adding one or more other features, figures, steps, actions, components, parts, or combinations thereof.

[0036] Hereinafter, with reference to the drawings, a resin composition, an adhesive member, and a display device according to one embodiment of the present invention will be described.

[0037] Figure 1 is a perspective view of a display device according to one embodiment. Figure 2 is a diagram showing the folded state of the display device shown in Figure 1.

[0038] The display device DD in one embodiment shown in Figure 1 may be a device activated by an electrical signal. For example, the display device DD may be, but is not limited to, a mobile phone, tablet, monitor, television, car navigation system, game console, or wearable device. The display device DD may be a flexible display device that can be folded, bent, or rolled up.

[0039] Referring to Figure 1, one embodiment of the display device DD may have a rectangular shape with a long side extending in a first direction DR1 and a short side extending in a second direction DR2 that intersects with the first direction DR1. However, the embodiment is not limited to this, and the display device DD may have various shapes on a plane, such as circles and polygons.

[0040] The display device DD displays video IM via a display surface DS. The display surface DS may include a display area DA and a non-display area NDA. The display area DA may be an area activated by an electrical signal. The display device DD may display video IM via the display area DA. The display area DA may sense various forms of external input. The non-display area NDA may be adjacent to the display area DA. The non-display area NDA may not display video. The non-display area NDA may surround the display area DA. Thereafter, the shape of the display area DA may be substantially defined by the non-display area NDA. However, this is an illustrative diagram, and the non-display area NDA may be located adjacent to only one side of the display area DA, or may be omitted.

[0041] The display surface DS may be parallel to the planes defined by the first direction DR1 and the second direction DR2. The normal direction of the display surface DS, i.e., the thickness direction of the display device DD, is indicated by the third direction DR3. The front (or top) and back (or bottom) surfaces of each component are separated by the third direction DR3. However, the directions indicated by the first to third directions DR1, DR2, and DR3 are relative concepts and may be converted to other directions.

[0042] In this specification, “on a plane” can mean a view from a plane parallel to the planes defined by the first direction DR1 and the second direction DR2. In this specification, “superimposed” can mean superimposed on a plane unless otherwise specified.

[0043] In one embodiment, the display device DD may sense external inputs applied from the outside. These external inputs may include various forms of input such as force, pressure, temperature, and light. The display device DD may also sense user touch inputs FG applied from the outside. In Figure 1 and other figures, the external input is shown to be the user's hand applied to the display surface DS, but this is illustrative, and the user's touch inputs FG may be provided in various forms. The user's touch inputs FG may include various forms of external inputs such as a part of the user's body, light, heat, or pressure. Furthermore, the display device DD may also sense user inputs applied to its sides or back depending on its structure, and is not limited to any one embodiment.

[0044] The display device DD of one embodiment may include at least one first folding region FA. Referring to Figures 1 and 2, the display device DD may include the first folding region FA and a plurality of non-folding regions NFA. The first folding region FA may be located between non-folding regions NFA1 and NFA2. For example, the first folding region FA may be located between the first non-folding region NFA1 and the second non-folding region NFA2. The first non-folding region NFA1 and the second non-folding region NFA2 may be separated in a first direction DR1 with the first folding region FA in between.

[0045] Figures 1 and 2 show, as an example, one first folding region FA and two non-folding regions NFA1 and NFA2, but the number of the first folding region FA and non-folding regions NFA1 and NFA2 is not limited to these. The display device DD may include multiple folding regions. Furthermore, the display device DD may be folded based on multiple folding axes so that a portion of the display surface DA faces each other. The number of folding axes included in the display device DD and the resulting number of non-folding regions are not limited to any one embodiment.

[0046] Referring to Figure 2, the display device DD may fold relative to the first folding axis FX. The first folding axis FX is a virtual axis extending in the second direction DR2 and may be aligned with the short side direction of the display device DD. However, this is illustrative, and the extension direction of the first folding axis FX is not limited to the second direction D2. The extension direction of the first folding axis FX may be the first direction D1. The folding region FA may be a part that can be transformed into a form that folds relative to the first folding axis FX. The radius of curvature RD of the folding region FA may be 5 mm or less.

[0047] Referring to Figure 2, the display device DD may be folded inward (in-folding) so that the first non-folding area NFA1 and the second non-folding area NFA2 face each other, and the display surface DS (Figure 1) may not be exposed to the outside. However, the embodiment is not limited to this, and contrary to the illustration in Figure 2, the display device DD may be folded outward (out-folding) so that the display surface DS is exposed to the outside.

[0048] Figure 3 is a perspective view of a display device DD-a according to one embodiment. Figure 4 is a diagram showing the folded state of the display device DD-a shown in Figure 3. The display device DD-a in Figure 3 differs from the display device DD in Figure 1 in the direction of extension of the folding axis. The display device DD shown in Figure 1 can be folded along the short axis, but unlike this, the display device DD-a shown in Figure 3 can be folded along the long axis. The display device DD-a in Figure 3 may include substantially the same configuration as the display device DD in Figure 1, except for the direction of extension of the folding axis and the resulting folding operation. When describing the display device DD-a in Figures 3 and 4, content that overlaps with the content described with reference to Figures 1 and 2 will be omitted.

[0049] Referring to Figures 3 and 4, the display device DD-a includes a folding region FA-a and a plurality of non-folding regions NFA1-a and NFA2-a. In the display device DD-a shown in Figures 3 and 4, the folding region FA-a may be referred to as the second folding region. The second folding region FA-a may be positioned between the non-folding regions NFA1-a and NFA2-a. For example, the second folding region FA-a may be positioned between the third non-folding region NFA1-a and the fourth non-folding region NFA2-a. The third non-folding region NFA1-a and the fourth non-folding region NFA2-a can be separated in the second direction DR2 with the second folding region FA-a in between.

[0050] In one embodiment, the display device DD-a may be folded with respect to a second folding axis FX-a. The second folding axis FX-a may be a virtual axis extending in the first direction DR1. The second folding axis FX-a may be aligned with the long side direction of the display device DD-a. Figure 4 shows that the display device DD-a is folded inward so that the display surface DS is not exposed to the outside, but the embodiment is not limited to this, and the display device DD-a may be folded with respect to its long axis and folded outward.

[0051] Figure 5 is a perspective view of a display device DD-b according to one embodiment. The display device DD-b according to one embodiment includes a folding region BA1, BA2 and a non-folding region NBA, but the folding regions BA1, BA2 may be folded from one side of the non-folding region NBA.

[0052] Referring to Figure 5, the display device DD-b of one embodiment may include a non-foldable area NBA where the video IM is displayed on the front, and a first foldable area BA1 and a second foldable area BA2 where the video IM is displayed on the sides. The first foldable area BA1 and the second foldable area BA2 may be folded from both sides of the non-foldable area NBA, respectively.

[0053] Referring to Figure 5, the non-folding region NBA may provide video IM to the third direction DR3, which is the front of the display device DD-b, the first folding region BA1 may provide video IM to the fifth direction DR5, and the second folding region BA2 may provide video IM to the fourth direction DR4. The fourth direction DR4 and the fifth direction DR5 may be directions that intersect with the first to third directions DR1, DR2, and DR3. However, the directions indicated by the first to fifth directions DR1 to DR5 are relative concepts and are not limited to the directional relationships shown in the figure.

[0054] In one embodiment, the display device DD-b includes a non-folding area NBA and folding areas BA1 and BA2 located on either side of the non-folding area NBA, respectively. It may also be a bending display device. In some embodiments, the display device DD-b may be a bending display device including one non-folding area NBA and one folding area BA1 or BA2. The folding area BA1 or BA2 may be provided folded on only one side of the non-folding area NBA. For example, the display device DD-b may include a first folding area BA1 and a non-folding area NBA, or a second folding area BA2 and a non-folding area NBA.

[0055] Figures 1 to 5 above illustrate foldable and bendable display devices, but the embodiments are not limited to these. One embodiment of the display device may be a retractable display device, a flat rigid display device, or a bent rigid display device.

[0056] In the following description of one embodiment of a display device, the description will be based on a display device DD that folds along its short axis. However, the embodiment is not limited to this, and may be applied not only to display devices DD-a that fold along their long axis, and display devices DD-b that include a folding area, as will be described later, but also to a variety of other forms of display devices.

[0057] Figure 6 is an exploded perspective view of a display device DD according to one embodiment. Figure 7 is a cross-sectional view of the display device DD according to one embodiment. Figure 7 is a cross-sectional view of the portion corresponding to the line I-I' in Figure 1.

[0058] Referring to Figures 6 and 7, one embodiment of the display device DD includes a display module DM, a window WP positioned on the display module DM, and an adhesive member AP positioned between the display module DM and the window WP. The display module DM and the window WP may be joined by the adhesive member AP. In some embodiments, the adhesive member AP may be positioned between components included in the display module DM.

[0059] The display module DM may be activated by an electrical signal. The display module DM may be activated to display the video IM (Figure 1) in the display area DA (Figure 1) of the display device DD. The display module DM may have an active area AA-DM and a peripheral area NAA-DM defined. The active area AA-DM may be an area activated by an electrical signal. The peripheral area NAA-DM may be an area located adjacent to at least one side of the active area AA-DM. Circuits and wiring for driving the active area AA-DM may be arranged in the peripheral area NAA-DM. On a plane, the active area AA-DM may be superimposed on the display area DA (Figure 1), and the peripheral area NAA-DM may be superimposed on the non-display area NDA (Figure 1).

[0060] The display module DM may include a display panel DP and an input sensing unit TP placed on the display panel DP. The display panel DP may include a base substrate BS, a circuit layer DP-CL placed on the base substrate BS, a display element layer DP-EL placed on the circuit layer DP-CL, and a sealing layer TFE covering the display element layer DP-EL. The configuration of the display panel DP shown in Figure 7 is illustrative, and the configuration of the display panel DP is not limited to that shown in Figure 7. For example, the display panel DP may include a liquid crystal display element, in which case the sealing layer TFE may be omitted.

[0061] The base substrate BS may provide a base surface on which the circuit layer DP-CL is arranged. The base substrate BS may be a flexible substrate that can be bent, folded, rolled, etc. The base substrate BS may be a glass substrate, a metal substrate, or a polymer substrate. However, the embodiments are not limited to these, and the base substrate BS may include an inorganic layer, an organic layer, or a composite material layer.

[0062] The circuit layer DP-CL may include an insulating layer, semiconductor patterns, conductive patterns, and signal lines. For example, the circuit layer DP-CL may include a switching transistor and a drive transistor for driving the light-emitting element (not shown) of the display element layer DP-EL.

[0063] The display element layer DP-EL may include a light-emitting element (not shown) that emits light. For example, the display element may be an organic light-emitting element, an inorganic light-emitting element, an organic-inorganic light-emitting element, a micro-LED, a nano-LED, a quantum dot light-emitting element, an electrophoretic element, an electrolyzed element, or the like.

[0064] The encapsulation layer TFE may be positioned above the display element layer DP-EL. The encapsulation layer TFE may protect the light-emitting element layer DP-EL from foreign matter such as moisture, oxygen, and / or dust particles. The encapsulation layer TFE may include at least one inorganic layer. Alternatively, the encapsulation layer TFE may include at least one organic layer and at least one inorganic layer. For example, the encapsulation layer TFE may include sequentially stacked inorganic layers, organic layers, and inorganic layers.

[0065] The input sensing unit TP may be placed on the display panel DP. For example, the input sensing unit TP may be placed directly on the sealing layer TFE of the display panel DP. The input sensing unit TP may sense an external input, convert it into a predetermined input signal, and provide the input signal to the display panel DP. For example, in one embodiment of the display device DD, the input sensing unit TP may be a touch sensing unit that senses a user's touch input FG (Figure 1). The input sensing unit TP may recognize a direct touch by the user, an indirect touch by the user, a direct touch by an object, or an indirect touch by an object.

[0066] The input sensing unit TP may sense at least one of the following: the position of an externally applied touch and the intensity (pressure) of the touch. The input sensing unit TP in one embodiment of the present invention may have a variety of structures or be made of a variety of materials, and is not limited to any one embodiment. The input sensing unit TP may include a plurality of sensing electrodes (not shown) for sensing external input. The sensing electrodes (not shown) may sense external input in a capacitive manner. The display panel DP may receive an input signal from the input sensing unit TP and generate an image in response to the input signal.

[0067] Referring to Figures 6 and 7, the window WP may protect the display panel DP and the input sensing unit TP, etc. The video IM (Figure 1) generated by the display panel DP may be provided to the user through the window WP. The window WP may provide the touch surface of the display device DD. In a display device DD that includes a folding area FA, the window WP may be a flexible window.

[0068] The window WP may include a base layer BL and a print layer BM. The window WP may also include a transparent area TA and a bezel area BZA. The front of the window WP, including the transparent area TA and the bezel area BZA, can correspond to the front of the display device DD.

[0069] The transmission region TA may be an optically transparent region. The bezel region BZA may be a region with relatively lower light transmittance compared to the transmission region TA. The bezel region BZA may have a predetermined color. The bezel region BZA may be adjacent to and surround the transmission region TA. The bezel region BZA may define the shape of the transmission region TA. However, the embodiments are not limited to these, and the bezel region BZA may be located adjacent to only one side of the transmission region TA, or a portion of it may be omitted.

[0070] The base layer BL may be a glass or plastic substrate. For example, tempered glass may be used as the base layer BL. Alternatively, the base layer BL may be made of a flexible polymer resin. For example, the base layer BL may include polyimide, polyacrylate, polymethyl methacrylate, polycarbonate, polyethylene naphthalate, polyvinylidene chloride, polyvinylidene fluoride, polystyrene, ethylene-vinyl alcohol copolymer, or a combination thereof. However, the embodiments are not limited to these, and any common material known as the base layer BL of a window WP in the relevant art may be used without limitation.

[0071] The print layer BM may be placed on one surface of the base layer BL. In one embodiment, the print layer BM may be provided on the lower surface of the base layer BL adjacent to the display module DM. The print layer BM may be placed in the edge region of the base layer BL. The print layer BM may be an ink print layer. Alternatively, the print layer BM may be a layer formed containing a pigment or dye. In the window WP, the bezel region BZA may be the portion where the print layer BM is provided.

[0072] The window WP may further include at least one functional layer (not shown) provided on the base layer BL. For example, the functional layer (not shown) may be a hard coating layer, an anti-fingerprint coating layer, etc., but the embodiments are not limited thereto.

[0073] The adhesive member AP may be positioned between the display module DM and the window WP. In one embodiment, the adhesive member AP included in the display device DD may be formed by providing a liquid resin composition onto one surface of the window WP or one surface of the display module DM, and curing the provided liquid resin composition with ultraviolet light. Alternatively, the adhesive member AP may be provided by curing a liquid resin composition with ultraviolet light in a separate process to form an adhesive film-like adhesive member AP, laminating one surface of the adhesive member AP in the form of an adhesive film onto one surface of the window WP or one surface of the display module DM, and attaching the remaining surface of the adhesive member AP to the surface of the window WP or the display module DM that is not attached.

[0074] The thickness of the adhesive member AP may be 50 μm or more and 500 μm or less. For example, the thickness of the adhesive member AP may be 50 μm or more and 200 μm or less, or 50 μm or more and 100 μm or less. However, this is merely an example, and the thickness of the adhesive member AP is not limited to these.

[0075] The adhesive member AP may be optically transparent. The adhesive member AP may be an optically clear adhesive resin layer (OCR) and an optically clear adhesive film (OCA). The adhesive member AP may be an optically clear adhesive resin layer (OCR). The adhesive member AP of one embodiment may contain a polymer derived from the resin composition RC of one embodiment (Figure 10a, etc.), which will be described later. The adhesive resin AP may consist of the resin composition RC of one embodiment. The adhesive member AP consisting of the resin composition RC of one embodiment can exhibit excellent adhesive reliability and elastic modulus. As a result, the display device DD including the adhesive member AP consisting of the resin composition RC can exhibit excellent durability in operating conditions such as folding, bending, and winding.

[0076] The adhesive member AP of one embodiment may have an elastic modulus of 0.01 MPa or more and 0.1 MPa or less at a temperature of 25°C. The elastic modulus may be the storage modulus assumed by the dynamic viscoelasticity measurement method in shear (torsion) mode at 1 Hz according to JIS K7244-7. The adhesive member AP consists of the resin composition RC of one embodiment (Figure 10a, etc.) and has a storage modulus of 0.01 MPa or more and 0.1 MPa or less at a temperature of 25°C, and can therefore exhibit excellent impact resistance and excellent flexibility.

[0077] Furthermore, the adhesive member AP may have a 180° peel strength of 500 gf / 50 mm or more at a temperature of 25°C for at least one of the glass substrate and polymer substrate. For example, the adhesive member AP may have a 180° peel strength of 500 gf / 25 mm or more and 1000 gf / 25 mm or less at a temperature of 25°C for at least one of the glass substrate and polymer substrate, but is not limited to this. The polymer substrate may contain polyethylene terephthalate (PET). The adhesive member AP is made of a resin composition RC of one embodiment (Figure 10a, etc.), and since it has a 180° peel strength of 500 gf / 50 mm or more at a temperature of 25°C for at least one of the glass substrate and polymer substrate, it can exhibit excellent adhesive reliability.

[0078] Figure 8 is a cross-sectional view showing a display device DD-1 according to one embodiment. In the following description of the display device for the display area DD-1 of the embodiment shown in Figure 8, we will not repeat any information that overlaps with the information described above with reference to Figures 1 to 7, and will focus on the differences.

[0079] The display device DD-1 shown in Figure 8 may further include a light control layer PP and an optical adhesive layer AP-a compared to the display device DD described with reference to Figures 6 and 7. In one embodiment, the display device DD-1 may further include a light control layer PP disposed between the adhesive member AP and the window WP, and an optical adhesive layer AP-a disposed between the light control layer PP and the window WP.

[0080] The optical control layer PP is positioned on the display panel DP and may control the reflected light on the display panel DP due to external light. The optical control layer PP may include, for example, a polarizing layer or a color filter layer.

[0081] The optical adhesive layer AP-a may be an optically transparent adhesive resin layer (OCR) or an optically transparent adhesive film (OCA). The optical adhesive layer AP-a may consist of a resin composition RC according to one embodiment (e.g., Figure 10a). The optical adhesive layer AP-a may also contain a polymer derived from the resin composition RC according to one embodiment, just like the adhesive member AP. As a result, the optical adhesive layer AP-a containing a polymer derived from the resin composition according to one embodiment has excellent adhesive strength and flexibility, and even when the display device DD-1 is folded or bent, the phenomenon of lifting does not occur at the interface of the optical adhesive layer AP-a, and it can exhibit excellent adhesive reliability and folding characteristics.

[0082] One embodiment of the display device DD-1 includes an optical adhesive layer AP-a and an adhesive member AP, which contain a polymer derived from the resin composition RC according to one embodiment. The display device DD-1 including the optical adhesive layer AP-a and the adhesive member AP can exhibit excellent adhesive reliability during operations such as folding.

[0083] Figure 9 is a cross-sectional view showing a display device DD-2 according to one embodiment. In the following description of the display device according to the embodiment shown in Figure 9, we will not repeat the content that was explained above with reference to Figures 1 to 8, and will focus on the differences.

[0084] The display device DD-2 shown in Figure 9 may have the adhesive member AP positioned between the components included in the display module DM, compared to the display device DD described with reference to Figures 6 and 7. Furthermore, the display device DD-2 may further include an optical adhesive layer AP-a and an interlayer adhesive layer PIB. The light control layer PP may be positioned between the adhesive member AP and the window WP, and the optical adhesive layer AP-a may be positioned between the light control layer PP and the window WP.

[0085] In one embodiment of the display device DD-2, the adhesive member AP may be placed between the display panel DP and the input sensing unit TP. That is, the input sensing unit TP may not be directly placed on the display panel DP, but rather the display panel DP and the input sensing unit TP may be bonded to each other by the adhesive member AP. For example, the adhesive member AP may be placed between the sealing layer TFE (Figure 7) of the display panel DP and the input sensing unit TP.

[0086] An interlayer adhesive layer PIB may be provided beneath the light control layer PP. The interlayer adhesive layer PIB is positioned between the input sensing unit TP and the light control layer PP and may be made of an adhesive material with excellent moisture-proof properties. For example, the interlayer adhesive layer PIB may be formed containing polyisobutylene. The interlayer adhesive layer PIB is positioned above the input sensing unit TP and can prevent corrosion of the sensing electrode of the input sensing unit TP.

[0087] One embodiment of the display device DD-2 includes an optical adhesive layer AP-a and an adhesive member AP, which contain a polymer derived from a resin composition RC (such as Figure 10a) according to one embodiment. The display device DD-2, including the optical adhesive layer AP-a and the adhesive member AP, can exhibit excellent reliability during operations such as folding.

[0088] The method for manufacturing a display device will be described below with reference to Figures 10a to 10d and Figures 11a to 11e. Figures 10a to 10d and Figures 11a to 11e are schematic diagrams showing some steps of the method for manufacturing a display device according to one embodiment of the present invention. The method for manufacturing a display device according to one embodiment includes a method for forming an adhesive member from a resin composition according to one embodiment. Figures 10a to 10d and Figures 11a to 11e are schematic diagrams showing the step of forming an adhesive member AP (see Figure 7) in the method for manufacturing a display device. The adhesive member AP formed by the method described with reference to Figures 10a to 11e may be applied to the display devices DD, DD-a, DD-b, DD-1, and DD-2 described in Figures 1 to 9. In the following description of the method for manufacturing a display device according to one embodiment, content that overlaps with the description of the display device according to one embodiment described above will not be explained again, and the focus will be on the differences.

[0089] Referring to Figures 10a to 10d, a method for manufacturing a display device according to one embodiment may include the steps of providing a resin composition RC and forming an adhesive member AP. The adhesive resin AP may consist of the resin composition RC according to one embodiment. The step of forming the adhesive member AP may include a curing step of curing the resin composition. The curing step may include a first curing step and a second curing step.

[0090] Referring to Figure 10a, a method for manufacturing a display device according to one embodiment may include the steps of preparing a first plate BP1 and providing a resin composition RC on the first plate BP1. The first plate BP1 may be fixed onto a stage ST to provide a reference surface on which the resin composition RC is provided. For example, the first plate BP1 may be a display module DM as described in Figure 7, or a window WP. The resin composition RC may be provided directly on one surface of the first plate BP1.

[0091] The first plate BP1 may be a temporary substrate used to form an adhesive member AP from a resin composition RC. When the first plate BP1 is provided as a temporary substrate, it can be used without limitation as long as the cured resin composition RC can be easily detached after curing of the resin composition RC provided on the first plate BP1. For example, the first plate BP1 may contain polyethylene terephthalate (PET). The first plate BP1 may be a PET film. When the first plate BP1 is used as a temporary substrate, one side of the first plate BP1 on which the resin composition RC is provided may be subjected to a release treatment. This allows the cured resin composition RC to be easily detached from the first plate BP1.

[0092] The resin composition RC of one embodiment may be provided on the first plate BP1 by inkjet printing or dispensing. The resin composition RC, provided by inkjet printing or dispensing, can exhibit properties that make it easy to apply to a variety of materials.

[0093] In one embodiment, the resin composition RC may be provided onto a first plate BP1 by an inkjet printing method. The resin composition RC may be dispensed onto the first plate BP1 from an inkjet head IHD located on top of a stage ST. The inkjet head IHD may include a plurality of nozzles NZ and be positioned at a predetermined distance from the top surface of the stage ST. The nozzles NZ may be spaced apart at predetermined intervals along one direction. For example, the nozzles NZ may be arranged in a row along a second direction DR2, but are not limited to this. The nozzles NZ may also be arranged in a row along a first direction DR1. Furthermore, the nozzles NZ may be arranged in two or more rows.

[0094] Each nozzle NZ may dispense the resin composition RC toward the first plate BP1. For example, the dispensing direction of each nozzle NZ may be perpendicular to the first plate BP1. However, the embodiment is not limited to this. Each nozzle NZ may include a discharge port having a circular hole shape. However, the embodiment is not limited to this, and the shape of the discharge port of each nozzle NZ may be varied in various ways. In addition, the number and size of nozzles NZ included in the inkjet head IHD may be varied in various ways.

[0095] The nozzles NZ included in the inkjet head IHD may be independently controlled by a control unit (not shown). The control unit (not shown) may control the amount and speed of the resin composition RC ejected from each nozzle NZ. This adjusts the amount of resin composition RC applied to the first plate BP1, thereby applying the resin composition in a desired shape. Although not shown, the inkjet head IHD may further include a storage unit (not shown) for storing the resin composition RC provided to the first plate BP1.

[0096] The resin composition RC in one embodiment may be a photocurable resin composition. The resin composition RC in one embodiment may be a UV-curable resin that is cured by ultraviolet light. The resin composition RC in one embodiment is in the liquid phase before curing and may be crosslinked or cured by receiving high energy such as ultraviolet light.

[0097] In one embodiment, the resin composition RC may contain 2-acryloyloxyethyl succinate and at least one (meth)acrylate monomer. The at least one (meth)acrylate monomer may contain 4-hydroxybutyl acrylate. In one embodiment, the (meth)acrylate monomer may contain a (meth)acryloyl group. In this specification, a (meth)acryloyl group refers to an acryloyl group or a methacryloyl group, and (meth)acrylic refers to acrylic or methacrylic. For example, a (meth)acrylate monomer is an acrylate monomer or methacrylate monomer containing one acryloyl group or one methacryloyl group.

[0098] The resin composition RC of one embodiment may contain 2-acryloyloxyethyl succinate and 4-hydroxybutyl acrylate. The resin composition RC may further contain one or more (meth)acrylate monomers in addition to 4-hydroxybutyl acrylate. In this specification, 4-hydroxybutyl acrylate may be referred to as the first monomer, and (meth)acrylate monomers other than 4-hydroxybutyl acrylate may be referred to as the second monomer. The resin composition RC of one embodiment may contain the first monomer and optionally further contain the second monomer. The resin composition RC may further contain at least one of a photoinitiator and a photo-activated oligomer.

[0099] The resin composition RC of one embodiment may be solvent-free. The resin composition RC may be solvent-free. The resin composition RC may be provided in a solvent-free form. The solvent-free type of resin composition RC can improve the ease of ejection from coating equipment such as inkjet heads IHD. Furthermore, in the process of manufacturing adhesive member AP, using the solvent-free type of resin composition RC can improve process efficiency because, unlike resin compositions containing volatile organic solvents, the heating step for drying the volatile organic solvent can be omitted.

[0100] The resin composition RC can be applied to a desired shape and may have a suitable viscosity for application by inkjet printing or other methods. In one embodiment, the resin composition RC may have a viscosity of 15 mPa·s or more and 25 mPa·s or less. The viscosity of the resin composition RC may be the shear viscosity measured by the JIS Z8803 method at a temperature of 25°C and 10 rpm. The resin composition RC may have a viscosity of 15 mPa·s or more and 25 mPa·s or less at a temperature of 25°C, be easily dispensed by inkjet printing or dispensing methods, and be applied to the first plate BP1 in a target shape.

[0101] If the viscosity of the resin composition RC is less than 15 mPa·s at a temperature of 25°C, dripping may occur due to the low viscosity, making it difficult to form a coating film of uniform thickness or to apply it to the desired shape and thickness. "Dripping" refers to the phenomenon where the resin composition RC flows away from the material to which it is to be applied. Furthermore, if the viscosity of the resin composition RC exceeds 25 mPa·s at a temperature of 25°C, it becomes difficult to dispense the resin composition RC in the appropriate amount from the application equipment used to apply it.

[0102] In one embodiment, the resin composition RC may contain 2-acryloyloxyethyl succinate in an amount of 5 wt% to 10 wt% relative to the total weight of the resin composition RC. For example, the resin composition RC may contain 5 wt% to 10 wt% of 2-acryloyloxyethyl succinate based on 100 wt% of the total weight of the resin composition. If the resin composition RC of one embodiment contains 2-acryloyloxyethyl succinate within the above-described content range, the resin composition RC can be easily applied to a coating target such as the first plate BP1 by inkjet printing and can have an appropriate viscosity that allows it to be applied to a desired shape. If the content of 2-acryloyloxyethyl succinate contained in the resin composition RC deviates from the above-described range, the viscosity of the resin composition RC may be too high and unsuitable for application by inkjet printing, or the viscosity of the resin composition RC may be too low and dripping may occur.

[0103] The resin composition RC may contain 4-hydroxybutyl acrylate in an amount of 5 wt% to 10 wt% relative to the total weight of the resin composition RC. For example, the resin composition RC may contain 5 wt% to 10 wt% of 4-hydroxybutyl acrylate based on 100 wt% of the total weight of the resin composition. If the resin composition RC of one embodiment contains 4-hydroxybutyl acrylate within the above-mentioned content range, the resin composition RC can be easily applied onto the first plate BP1 by inkjet printing and can have an appropriate viscosity that allows it to be applied to a desired shape. Furthermore, if the resin composition RC contains 4-hydroxybutyl acrylate within the above-mentioned content range, the adhesive strength of the resin composition RC can be excellent. On the other hand, if the content of 4-hydroxybutyl acrylate contained in the resin composition RC deviates from the above-mentioned content range, the viscosity of the resin composition RC may become excessively high or low, which may reduce the adhesive strength.

[0104] The resin composition RC may contain a second monomer. The second monomer may be a different type of (meth)acrylate monomer than 4-hydroxybutyl acrylate. The resin composition RC may further contain one or more of the second monomers. The second monomer may contain at least one of 2-ethylhexyl acrylate, tetrahydrofurfuryl acrylate, and 2-ethylhexyl diglycol acrylate. For example, the second monomer may contain 2-ethylhexyl acrylate, tetrahydrofurfuryl acrylate, and 2-ethylhexyl diglycol acrylate. However, the embodiments are not limited thereto.

[0105] If the resin composition RC contains a second monomer, the resin composition RC may contain the second monomer in an amount of about 50 wt% to 80 wt% relative to the total weight of the resin composition. For example, the resin composition RC may contain the second monomer in an amount of about 50 wt% to 80 wt%, or about 70 wt% to 80 wt%, based on 100 wt% of the total weight of the resin composition RC. If the second monomer is contained in the resin composition RC within the above-mentioned content range, the adhesive member AP made of the resin composition RC of one embodiment can exhibit improved peel strength and excellent elastic modulus. Therefore, the display device including the adhesive member AP of one embodiment can have excellent adhesive strength and be easily folded and unfolded.

[0106] The resin composition RC of one embodiment may contain a urethane acrylate oligomer. The resin composition RC may contain one or more types of urethane acrylate oligomers. The weight-average molecular weight of the urethane acrylate oligomer may be 10,000 or more and 38,000 or less. The urethane acrylate oligomer with a weight-average molecular weight of 10,000 or more and 38,000 or less may be in an oligomer state having a relatively high degree of polymerization. If the resin composition RC contains a urethane acrylate oligomer having the above-mentioned weight-average molecular weight, the resin composition RC can maintain a high degree of polymerization even after photocuring and can exhibit excellent flexibility. Therefore, the adhesive member AP made of the resin composition RC of one embodiment can achieve both excellent adhesion and flexibility.

[0107] For example, the urethane acrylate oligomer may include at least one of UF-C051 (urethane acrylate, manufactured by Kyoeisha Chemical Co., Ltd.), UF-C052 (urethane acrylate, manufactured by Kyoeisha Chemical Co., Ltd.), and UN6304 (urethane acrylate, manufactured by Negami Chemical Industrial Co., Ltd.). However, this is illustrative and the urethane acrylate oligomer contained in the resin composition RC is not limited to these.

[0108] If the resin composition RC contains a urethane acrylate oligomer, the urethane acrylate oligomer may be present in an amount of 1 wt% to 15 wt% relative to the total weight of the resin composition. For example, the resin composition RC may contain approximately 1 wt% to 10 wt% of the urethane acrylate oligomer based on 100 wt% of the total weight of the resin composition. However, this is an example, and the content of the urethane acrylate oligomer in the resin composition RC is not limited to this.

[0109] The resin composition RC of one embodiment may contain a photoinitiator. The photoinitiator may contain a radical polymerization initiator. The resin composition may contain one or more photoinitiators. If the resin composition contains multiple photoinitiators, each photoinitiator may be activated by ultraviolet light with a different central wavelength.

[0110] For example, it may contain at least one of the following: a photoinitiator, 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxycyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methyl-1-propanone, and 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]phenyl}-2-methylpropan-1-one.

[0111] In addition, photoinitiators, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1, 2-dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)-butan-1-one, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, ethyl(2,4,6-trimethylbenzoyl)phenyl The resin composition RC may contain at least one of the following: sphinate, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, [1-(4-phenylsulfanylbenzoyl)heptylideneamino]benzoate, [1-[9-ethyl-6-(2-methylbenzoyl)carbazole-3-yl]ethylideneamino]acetate, and bis(2,4-cyclopentadienyl)bis[2,6-difluoro-3-(1-pyryl)phenyl]titanium(IV). The resin composition RC may also contain at least one of Omnirad 819 (manufactured by IGM Resins) and Omnirad 184 (manufactured by IGM Resins) as photoinitiators. Omnirad 819 (manufactured by IGM Resins) and Omnirad 184 (manufactured by IGM Resins) may be radical polymerization initiators.

[0112] Referring to Figure 10b, a method for manufacturing a display device according to one embodiment may include a first curing step of providing a first UV-1 light to a resin composition RC coated on one surface of a first plate BP1. The first UV-1 light may be directly irradiated onto the resin composition RC. The resin composition RC may be cured by the first UV-1 light. The first UV-1 light may be ultraviolet light. The amount of light from the first UV-1 light provided to the resin composition RC in the first curing step may be less than the amount of light from the second UV-2 light provided in the second curing step. The first curing step may be a step of providing the first UV-1 light to the resin composition RC to pre-cure it. In this case, pre-cure means a step in which the polymerization reaction of the resin composition RC is partially carried out to a level in which the resin composition RC is cured to a level in which it is not completely cured. Pre-cure is distinct from the effect in the second curing step, and a different amount of light may be irradiated than the amount of light provided in the second curing step. For example, the pre-curing may be performed by irradiating the resin composition RC with a light intensity of about 1 / 3 to 1 / 10 of the light intensity required in the second curing step, but the embodiments are not limited thereto. The resin composition RC may be pre-cured in the first curing step and formed into a preliminary adhesive member P-AP (Figure 10c).

[0113] Figure 10b shows that the first UV-1 light is directly irradiated onto the resin composition RC, but the embodiments are not limited to this. A carrier film (not shown) that transmits ultraviolet light may be placed above the resin composition RC coated on the first plate BP1, separated from the first plate BP1 to which the resin composition RC is coated. In this case, the first UV-1 light may be irradiated onto the top of the carrier film (not shown) and transmitted through the carrier film (not shown) to the resin composition RC.

[0114] Referring to Figure 10c, a method for manufacturing a display device according to one embodiment may include a second curing step of providing a second UV-2 light to a preliminary adhesive member P-AP. The second curing step may involve laminating a second plate BP2 onto the preliminary adhesive member P-AP, and then irradiating the preliminary adhesive member P-AP with the second UV-2 light to cure it. The second UV-2 light may be provided from above the second plate BP2, or it may be provided to the preliminary adhesive member P-AP by passing through the second plate BP2. The second UV-2 light may be ultraviolet light. The preliminary adhesive member P-AP is fully cured by the second UV-2 light, but the adhesive member AP may be formed as shown in Figure 10d after the preliminary adhesive member P-AP has fully cured. The first plate BP1 and the second plate BP2 may be bonded together during the process of the preliminary adhesive member P-AP being fully cured. The first plate BP1 and the second plate BP2 may be bonded together via the adhesive member AP.

[0115] The second plate BP2 may be a display module DM as described in Figure 7, or a window WP. The second plate BP2 and the first plate BP1 may be different. For example, if the first plate BP1 is a display module DM, the second plate BP2 may be a window WP. Or, if the first plate BP1 is a window WP, the second plate BP2 may be a display module DM.

[0116] As described with reference to Figures 10a to 10d, the adhesive member AP of one embodiment may be formed by providing light to the resin composition RC at least twice in the first and second curing steps, and the embodiment is not limited thereto. For example, the adhesive member AP may be formed by providing light to the resin composition RC once without pre-curing, or it may be formed by providing light to the resin composition RC three or more times.

[0117] In one embodiment, the resin composition RC, once fully cured by ultraviolet curing, may have an elastic modulus of 0.01 MPa or more and 0.1 MPa or less at 25°C. That is, the elastic modulus of the resin composition RC at 25°C may be 0.01 MPa or more and 0.1 MPa or less. In this specification, "cured product" may mean all the products formed by the complete curing of the resin composition RC, for example, an adhesive member AP.

[0118] Furthermore, the adhesive member AP, which is a cured product of the resin composition RC, may have a 180° peel strength of 500 gf / 25 mm or more at a temperature of 25°C for at least one of the polymer substrate and the glass substrate. For example, the cured product of the resin composition RC may have a 180° peel strength of 500 gf / 25 mm or more and 1000 gf / 25 mm or less at a temperature of 25°C for at least one of the glass substrate and the polymer substrate. The resin composition RC of one embodiment contains 2-acryloyloxyethyl succinate and 4-hydroxybutyl acrylate in specific content ranges, satisfies the viscosity range described above, and can satisfy the storage modulus and 180° peel strength described above after curing. Therefore, the adhesive member AP made of the resin composition RC of one embodiment can exhibit excellent adhesion and flexibility.

[0119] Figures 11a to 11e schematically show a method for manufacturing a display device according to one embodiment. Figures 11a to 11e illustrate the step of providing a resin composition in the method for manufacturing a display device according to one embodiment. In the method for manufacturing a display device according to one embodiment, which will be described with reference to Figures 11a to 11e, we will not repeat the content that was described with reference to Figures 1 to 10d, and will focus on the differences.

[0120] Figure 11a schematically shows the step of providing a resin composition RC on a first plate BP1 in a method for manufacturing a display device according to one embodiment. Figure 11b schematically shows the first plate BP1 on a planar surface.

[0121] Referring to Figures 11a and 11b, the resin composition RC of one embodiment may be provided on the first region AA1 and the second region AA2 of the first plate BP1 by a preset coating amount. The resin composition RC may be provided on the first plate BP1 by an inkjet printing method. The first plate BP1 may have a first region AA1 and the second region AA2 defined within it. The first region AA1 and the second region AA2 may be regions arbitrarily set on the first plate BP1. The first region AA1 may correspond to the central portion of the first plate BP1. The second region AA2 may correspond to the edge portion of the first plate BP1 relative to the first region AA1. On the plane defined by the first direction DR1 and the second direction DR2, the second region AA2 may surround the first region AA1. In one embodiment, the first width W1 in the first direction DR1 and the second width W2 in the second direction DR2 of the second region AA2 may each be about 3 mm or less, but the embodiment is not limited to this.

[0122] The area of ​​the first region AA1 on a plane may be relatively larger than the area of ​​the second region AA2 on a plane. According to one embodiment, the first region AA1 of the first plate BP1 may correspond to at least a part of the display area DA of the display device DD (Figure 7). Also, the second region AA2 of the first plate BP1 may correspond to at least a part of the relative display area NDA of the display device DD (Figure 7).

[0123] The first region AA1 may contain a plurality of first unit regions AA1-1. The second region AA2 may contain a plurality of second unit regions AA2-1 and a plurality of third unit regions AA2-2. On a plane, the first to third unit regions AA1-1, AA2-1, and AA2-2 may each have the same area, but the embodiment is not limited to this. In the first plate BP1 of one embodiment 1, if the first to third unit regions AA1-1, AA2-1, and AA2-2 are the same in planar, the number of first unit regions AA1-1 contained in the first region AA1 may be greater than the number of second and third unit regions AA2-1 and AA2-2 contained in the second region AA2.

[0124] The second unit region AA2-1 and the third unit region AA2-2 are each positioned at the edge of the first plate BP1 and may have a shape that surrounds the first region AA1 on a plane. The third unit region AA2-2 may be positioned more adjacent to the first region AA1 than the second unit region AA2-1. For example, the third unit region AA2-2 may be in direct contact with the first region AA1 and have a closed line that surrounds the first region AA1 on a plane. The second unit region AA2-1 may be separated from the first region AA1 and have a shape that surrounds the first region AA1 with the third unit region AA2-2 in between.

[0125] In one embodiment, the resin composition RC may be provided in different amounts on the first region AA1 and the second region AA2 of the first plate BP1. For example, since the first region AA1 of the first plate BP1 may have a larger planar area than the second region AA2, the resin composition RC may be provided in a larger amount to the first region AA1 than to the second region AA2. The amount of resin composition RC provided on the first region AA1 and the second region AA2 may be adjusted by controlling the amount of resin composition RC ejected from the nozzles NZ of the inkjet head IHD. For example, the amount of resin composition RC ejected from the nozzles NZ located on the first region AA1 may be greater than the amount of resin composition RC ejected from the nozzles NZ located on the second region AA2. In addition, a greater number of nozzles NZ than the second region AA2 may be located on the first region AA1.

[0126] In some embodiments, when using the area on the same plane as a reference, the amount of resin composition RC applied to the first region AA1 and the amount of resin composition RC applied to the second region AA2 may differ. For example, when the first to third unit regions AA1-1, AA2-1, and AA2-2 each have the same area on the same plane, the amount of resin composition RC applied to each of the first unit regions AA1-1 may be less or more than the amount of resin composition RC applied to the second and third unit regions AA2-1 and AA2-2, respectively, but the embodiments are not limited to this. The amount of resin composition RC applied to each of the first unit regions AA1-1 may be less than the amount of resin composition RC applied to each of the second unit regions AA2-1.

[0127] In one embodiment, a constant amount of resin composition RC may be applied to the first region AA1. For example, the amount of resin composition RC dispensed from the nozzle NZ and provided to each of the first unit regions AA1-1 may be substantially the same. In this specification, substantially the same includes cases where the difference is within the tolerance range of the process, as long as the physical numerical values ​​are the same. The resin composition RC may be applied to the first region AA1 with a constant thickness. Thus, the pre-adhesive member P-AP (Figure 11d) superimposed on the first region AA1 can have a constant thickness.

[0128] As described above, the resin composition RC of one embodiment has viscosity characteristics that allow it to be applied to any shape using an inkjet printing method. The amount of resin composition RC applied to the second region AA2 may be set to vary depending on the location. In one embodiment, the amount of resin composition RC applied to the second unit region AA2-1 and the amount of resin composition RC applied to the third unit region AA2-2 may be set separately. For example, the amount of resin composition RC applied to the second unit region AA2-1 and the amount applied to the third unit region AA2-2 may be different from each other. The amount of resin composition RC applied to the second unit region AA2-1, which is separated from the first region AA1, may be greater than the amount applied to the third unit region AA2-2, which is adjacent to the first region AA1. The amount of resin composition RC applied to the third unit region AA2-2 may be less than the amount of resin composition RC applied to the second unit region AA2-1. However, the embodiments are not limited thereto.

[0129] In one embodiment, the resin composition RC may be applied to the second region AA2 of the first plate BP1 with a thickness having a height difference in the third direction DR3. The thickness of the resin composition RC may have a height difference that includes the highest and lowest points in the second region AA2. The resin composition RC applied on the second region AA2 may have a thickness that includes the highest point in the second unit region AA2-1 and a thickness that includes the lowest point in the third unit region AA2-2, but the embodiment is not limited thereto. In one embodiment, the thickness of the resin composition RC applied on the first region AA1 may be lower than the maximum thickness of the resin composition RC applied on the second region AA2. The thickness of the resin composition RC applied on the first region AA1 may be higher or lower than the minimum thickness of the resin composition RC applied on the second region AA2, or it may be the same, and the embodiment is not limited to any one of these embodiments.

[0130] Figure 11c is a diagram illustrating the step of curing the resin composition in a method for manufacturing a display device according to one embodiment. Figure 11d is a diagram illustrating the step of secondary coating of the resin composition RC, which is part of the step of forming an adhesive member in a method for manufacturing a display device according to one embodiment.

[0131] Referring to Figure 11c, a method for manufacturing a display device according to one embodiment may involve applying a resin composition RC to a first region AA1 and a second region AA2 of a first plate BP1, and then curing the resin composition RC. The resin composition RC may be cured by light. For example, the resin composition RC may be irradiated with third-light UV-1a. The third-light UV-1a may be irradiated directly onto the resin composition RC applied on the first plate BP1. The third-light UV-1a may be ultraviolet light, but is not limited to this.

[0132] In one embodiment, a preliminary adhesive member P-AP (see Figure 11d) may be formed from a resin composition RC cured by the third UV-1a. That is, the resin composition RC may be polymerized at least partially by the provided third UV-1a, and then formed into a preliminary adhesive member P-AP (see Figure 11d). The resin composition RC cured by the third UV-1a may have a constant thickness in the first region AA1 and a thickness with height differences in the second region AA2. In this case, the cured resin composition RC may have a thickness that includes the highest point (peak) in the second unit region AA2-1 of the second region AA2. The resin composition RC applied to the first plate BP1 may have its maximum thickness in the second unit region AA2-1. The preliminary adhesive member P-AP (see Figure 11d) with height differences in the second region AA2 may be referred to as the "first preliminary adhesive member".

[0133] In the step of curing the resin composition RC, the amount of third UV-1a light irradiated onto the resin composition RC may be sufficient to partially cure the resin composition RC. Unreacted resin composition RC may be further reacted in the next step to form the final adhesive member AP (Figure 10d) from the preliminary adhesive member P-AP. However, in the step of curing the resin composition RC, the amount of third UV-1a light irradiated onto the resin composition RC may be sufficient to completely cure the resin composition RC.

[0134] The pre-adhesive member P-AP, made of the resin composition RC, may have different thicknesses in the first region AA1 and the second region AA2. For example, the maximum thickness of the pre-adhesive member P-AP may differ in the first region AA1 and the second region AA2. When using the area on the same plane as a reference, the first application amount of the resin composition RC provided to the first region AA1 may be less than the second application amount of the resin composition RC provided to the second region AA2. Therefore, the average thickness of the pre-adhesive member P-AP superimposed on the first region AA1 may be less than the average thickness of the pre-adhesive member P-AP superimposed on the second region AA2.

[0135] When a pre-adhesive member P-AP superimposed on the first region AA1 is referred to as the first pre-adhesive portion, and a pre-adhesive member P-AP superimposed on the second region AA2 is referred to as the second pre-adhesive portion, the thickness deviation of the second pre-adhesive portion may be larger than the thickness deviation of the first pre-adhesive portion. The first region AA1 is divided into a plurality of first unit regions AA1-1 (Figure 11b), and the resin composition may be applied to each of the plurality of first unit regions AA1-1 with the same set application amount. The second region AA2 is divided into a plurality of second and third unit regions AA2-1 and AA2-2, and the resin composition RC may be applied to each of the plurality of second and third unit regions AA2-1 and AA2-2 with the set application amount. Since the application amount of at least one of the plurality of second and third unit regions AA2-1 and AA2-2 differs from the application amount of the other unit regions AA2-1 and AA2-2, a weight deviation of the provided resin composition RC may occur. Therefore, the thickness deviation of the second region AA2 may be relatively larger than the thickness deviation of the first region AA1.

[0136] In one embodiment, the method for manufacturing the display device may further include the step of additionally providing the resin composition RC onto the first plate BP1. In one embodiment, the method for manufacturing the display device may further include the step of secondary coating the resin composition RC onto a pre-adhesive member P-AP.

[0137] Referring to Figure 11d, the resin composition RC of one embodiment may be additionally supplied on the first plate BP1 by an inkjet printing method. The resin composition RC may be supplied to a pre-adhesive member P-AP so as to be superimposed on the second region AA2 of the first plate BP1. In the step of secondary coating of the resin composition RC, the resin composition RC may also be supplied to the first region AA1.

[0138] In the step of secondary coating of the resin composition RC, the amount of resin composition RC applied can be appropriately set considering the thickness of the preliminary adhesive member P-AP. In one embodiment, the amount of resin composition RC applied in the secondary coating step may be smaller than the first and second amounts of resin composition RC applied to the first region AA1 and the second region AA2 described above. For example, when the amount of resin composition RC applied to the first and second regions AA1 and AA2 is set to 100, the amount of resin composition RC applied to the first and second regions AA1 and AA2 in the secondary coating step may be less than 100. The preliminary adhesive member P-AP, which has a thickness deviation in the portion overlapping with the second region AA2, can have its thickness deviation reduced by the secondary coating step of resin composition RC.

[0139] Figure 11e shows a step in curing a resin composition in a method for manufacturing a display device according to one embodiment. Referring to both Figure 11d and Figure 11e, a second coat of resin composition RC may be performed after the second coat of resin composition RC.

[0140] In one embodiment, the resin composition RC provided on the first plate BP1 may be irradiated with fourth-light UV-1b. The fourth-light UV-1b may be ultraviolet light, but is not limited to this. The resin composition RC may be cured by irradiation with fourth-light UV-1b. After the resin composition RC is polymerized and cured by fourth-light UV-1b, it may be formed together with the pre-adhesive member P-AP to form the adhesive member AP (Figure 10d). On the other hand, Figure 11e exemplifies the irradiation of both the first region AA1 and the second region AA2 with fourth-light UV-1b, but is not limited to this, and fourth-light UV-1b may be selectively irradiated only to the second region AA2 depending on the degree of curing of the pre-adhesive member P-AP.

[0141] Figure 12 is a cross-sectional view showing an enlarged view of the AA' region of 11c. Figure 12 is a diagram illustrating the shape in which the resin composition RC is coated onto the first plate BP1.

[0142] The resin composition RC applied to the first plate BP1 may include a first portion superimposed on the first region AA1 and a second portion superimposed on the second region AA2. The first plate BP1 of the resin composition RC may be applied to the first region AA1 with a constant thickness. This allows the resin composition RC to have a flat upper surface in the first portion superimposed on the first region AA1.

[0143] The resin composition RC may be applied to the second region AA2 on the first plate BP1 with a thickness that includes a highest and lowest point. This allows the resin composition RC to have a peak portion PK in the second part where the thickness in the third direction DR3 is maximum. The peak portion PK may superimpose on the second region AA2 and represent the point where the coating thickness of the resin composition RC is maximum from the upper surface BP_UF of the first plate BP1. The resin composition RC applied to the second region AA2 has a maximum height h in the second part superimposed on the second region AA2. m It may include a peak portion PK having a peak portion.

[0144] In the second part, the thickness of the resin composition RC can be progressively reduced in the direction away from the first region AA1. That is, the thickness of the resin composition RC applied to the second region AA2 of the first plate BP1 can be progressively reduced towards the edge at the peak portion PK. In this specification, the edge means the terminal point on the first plate BP1 where the resin composition RC is applied. In this specification, the portion in the second part where the thickness decreases from the peak portion PK towards the edge may also be referred to as a slope.

[0145] In one embodiment, the horizontal distance d from the edge of the resin composition RC applied to the second region AA2 to the peak portion PK is as follows: p The distance may be 500 μm or less. For example, the horizontal distance d from the edge of the first plate PB1 to which the resin composition RC is applied to the peak portion PK. p The thickness may be between 300 μm and 500 μm. The horizontal distance d from the edge to the peak portion PK. p This may mean the shortest distance measured between the first virtual line LN extending from the peak portion PX in the third direction DR3 and the end of the adhesive member AP. The horizontal distance d from the end of the resin composition RC applied to the second region AA2 to the peak portion PK p If the slope becomes too long, it may become visible outside the display devices DD, DD-a, and DD-b (see Figures 1, 3, and 5), potentially degrading the image quality.

[0146] The resin composition of one embodiment, containing the above-described composition, has an appropriate viscosity range that allows it to be applied to the intended shape by inkjet printing, and the horizontal distance d from the edge to the peak portion PK p This provides the effect of reducing the amount within a certain range. Furthermore, since the adhesive member made of the resin composition of one embodiment has a storage modulus of 0.01 MPa or more and 0.1 MPa or less at 25°C, it can exhibit excellent adhesive reliability and modulus.

[0147] The following describes in detail, with reference to examples and comparative examples, an adhesive member and a display device according to one embodiment of the present invention. Furthermore, the following examples are illustrative to aid in understanding the present invention, and the scope of the present invention is not limited thereto.

[0148] [Examples] 1. Manufacturing of resin compositions The resin compositions of the examples and comparative examples were prepared according to the mixing ratios shown in Tables 1 and 2. The materials disclosed in Tables 1 and 2 were provided in light-shielding poly containers in their respective weight proportions. Next, Omnirad 819 (manufactured by IGM Resin) was provided as a photoinitiator at a concentration of 2 wt% relative to the total weight of the resin composition. Then, using a Three-One Motor (manufactured by Shinto Scientific Co., Ltd.), a stirrer was used to prepare the resin compositions of the examples and comparative examples by stirring at 10 rpm for 1 minute at room temperature to ensure uniform mixing of the compositions.

[0149] [Table 1]

[0150] [Table 2]

[0151] <Components contained in the resin composition in Table 1 and Table 2> UF-C051: Urethane acrylate (Kyoeisha Kagaku Co. Ltd. product, weight-average molecular weight 35000) UF-C052: Urethane acrylate (Kyoeisha Kagaku Co. Ltd. product, weight-average molecular weight: 10000) UN6034: Urethane acrylate (Product of Negami Chemical Industrial Co., Ltd., weight-average molecular weight: 10000) HOA-MS: Acryloylethyl succinate HOA-MPE: 2-Ethyl 2-hydroxyethyl acryloxyphthalate DEAA: N,N - Diethylacrylamide (KJ Chemicals Co., Ltd.) 4 - HBA: 4 - Hydroxybutyl acrylate (Product of Osaka Organic Chemical Industry Ltd.) 2 - EHA: 2 - Ethylhexyl acrylate (Product of Toagosei Co., Ltd.) THF - A: Tetrahydrofurfuryl acrylate (Product of KYOEISHA CHEMICAL Co., Ltd.) EHDG - AT: 2 - Ethylhexyl - diglycol acrylate (Product of KYOEISHA CHEMICAL Co., Ltd.)

[0152] 2. Evaluation of Resin Composition and Adhesive Member 1) Viscosity Measurement of Resin Composition The shear viscosity of the resin compositions of the examples and comparative examples was measured at 25°C according to JIS Z8803 method. The shear viscosity of the resin compositions was measured using a viscometer TVE - 25L (Product of TOKI SANGYO Co., Ltd.) under the speed condition of 10 rpm, and the results are shown in Table 3 and Table 4.

[0153] 2) Measurement of Storage Elastic Modulus of Adhesive Member On a glass substrate (Product of Matsunami Glass Ind., Ltd., S1112), a patterned PET film (Product of FANUC Corp., NP100A) and a silicon rubber sheet (Product of Tigers Polymer Corp.) with a hole of 8 mm in diameter were sequentially laminated. About 28 μL of the resin compositions of the examples and comparative examples were provided to the silicon rubber hole. Next, a UV LED lamp having peaks at wavelengths of 405 nm and 365 nm was used, and light was irradiated so that the total amount of each light was 220 mJ / cm 2 and 380 mJ / cm 2 . Then, a UV LED lamp having a peak at a wavelength of 395 nm was used above the glass substrate, and light was irradiated so that the total amount of light was 4000 mJ / cm 2 to effect the resin composition, and circular samples with a diameter of 8 nm and a thickness of 500 μm were obtained.

[0154] The obtained samples were used for viscoelasticity measurements. Using an MCR302 (manufactured by Anton-Paar), the storage modulus was measured according to JIS K724-7 at a measurement temperature of -50°C to 60°C and a measurement frequency of 1 Hz. The storage modulus at 25°C confirmed by the measurements was verified, and the results are shown in Tables 3 and 4.

[0155] 3) Measurement of the 180° peel force of the adhesive material The resin compositions of the examples and comparative examples were coated to a thickness of 50 μm onto 20 nm × 76 mm soda-lime glass (manufactured by Central Glass Co., Ltd.) using a bar coater. UV LED lamps with peaks at wavelengths of 365 nm and 395 nm were used to illuminate the soda-lime glass coated with the resin compositions, with a total light intensity of 800 mJ / cm². 2 , 400 mJ / cm 2 Light was irradiated to achieve the desired result. A 20mm x 150mm PET film (A4360, TOYOBO Co., Ltd. product) was placed on top of the irradiated resin composition and bonded with a bonding pressure of 0.15 MPa. After bonding, a UV LED lamp with a peak wavelength of 395 nm was used on the PET film to supply light at a rate of 4000 J / cm². 2 The sample was obtained by irradiating it with light in this manner.

[0156] The peel force of the obtained samples was measured using a Universal Testing Machine (Instron Corporation, Model 5965) at a speed of 300 mm / min under constant temperature conditions of 25°C and 60°C, so that the peel angle was 180°. The average value of approximately 50 mm of peeling was calculated, and the results of evaluating the values ​​obtained by multiplying them by 1.25 are shown in Tables 3 and 4.

[0157] 4) Evaluation of the coating shape of the resin composition A DevicePrinter-CX (MICROJET CORP.) equipped with a KM1024i (KONICA MINOLTA, INC.) inkjet printer was used. The voltage, pulse drive period, and temperature were adjusted to achieve an ejection speed of 5.5 m / s to 6.5 m / s. After setting the coating conditions to achieve a 55 mm x 120 mm shape and a specified coating amount, the PET film (SK Chemicals Co., Ltd., SH86) was cleaned using an atmospheric pressure plasma treatment device and then coated. The shape of the coated film of the example and comparative example compositions applied to the end portion of the PET film was measured using a KEYENCE laser microscope VK-X3000. The horizontal distance from the edge to the peak of the resin composition applied to the PET film was measured and is shown in Tables 3 and 4 below. The result obtained from the horizontal distance measurement was rounded to one decimal place and measured as "edge to peak distance". On the other hand, comparative examples 1 and 6 had high viscosity, so the peel strength "edge to peak I (peak) distance" was not evaluated. Furthermore, the adhesive members produced from the resin compositions of Comparative Examples 3 to 5 and 7 were found to have insufficient peel strength, and therefore, the "edge-to-peak distance" was not evaluated.

[0158] [Table 3]

[0159] [Table 4]

[0160] Referring to Tables 3 and 4, it can be confirmed that the resin compositions of Examples 1 to 4, each containing 2-acryloylethyl succinate and 4-hydroxybutyl acrylate in specific content ranges, all have a viscosity suitable for application by inkjet printing.

[0161] In contrast, the resin composition of Comparative Example 1, which does not contain 2-acryloylethyl succinate and contains an excess amount of 4-hydroxybutyl acrylate, shows that the viscosity of the resin composition is excessively high. In the case of Comparative Example 2, the viscosity of the resin composition is somewhat lower due to the absence of 2-acryloylethyl succinate, and it can be confirmed that the "edge-to-peak distance" exceeds 500 μm.

[0162] Furthermore, while Comparative Example 3, which contained HOA-MPE instead of 2-acryloylethyl succinate, showed a similar viscosity level to Example 1, the peel strength of the adhesive material produced from the resin composition was significantly reduced. Comparative Example 4, which did not contain 4-hydroxybutyl acrylate, and Comparative Example 5, which did not contain 2-acryloylethyl succinate, also showed significantly reduced peel strength compared to the examples. In addition, the resin composition of Comparative Example 6 showed high viscosity due to a 2-acryloylethyl succinate content exceeding 10 wt%, and in the case of Comparative Example 7, the 4-hydroxybutyl acrylate content was less than 5 wt%, confirming that the peel strength decreased when manufactured as an adhesive material.

[0163] Although preferred embodiments of the present invention have been described so far with reference, a person skilled in the art or with ordinary knowledge in the art will understand that the present invention can be modified and altered in various ways without departing from the spirit and art domain of the invention as described in the claims below.

[0164] Therefore, the technical scope of the present invention is not limited to what is described in the detailed description of the specification, but should be determined by the claims. [Explanation of symbols]

[0165] DD, DD-a, DD-b, DD-1: Display device DP: Display Panel WP: Window AP: Adhesive member AA1: First area AA2: Second area RC: Resin composition

Claims

1. In relation to the total weight of the resin treatment, 2-acryloyloxyethyl succinate in an amount of 5 wt% to 10 wt%, A resin composition comprising 5 wt% to 10 wt% of 4-hydroxybutyl acrylate.

2. The resin composition according to claim 1, wherein the viscosity at 25°C is 15 mPa·s or more and 25 mPa·s or less.

3. The resin composition according to claim 1, further comprising one or more urethane acrylate oligomers.

4. The resin composition according to claim 3, wherein the urethane acrylate oligomer has a weight-average molecular weight of 10,000 or more and 38,000 or less.

5. The resin composition according to claim 1, further comprising one or more (meth)acrylate monomers different from the 4-hydroxybutyl acrylate.

6. The resin composition according to claim 5, further comprising at least one of 2-ethylhexyl acrylate, tetrahydrofurfuryl acrylate, and 2-ethylhexyldiglycol acrylate.

7. The resin composition according to claim 1, wherein the storage modulus at 25°C after photocuring is 0.01 MPa or more and 0.1 MPa or less.

8. The steps include providing a resin composition on a first plate, The step includes forming an adhesive member from the resin composition, The aforementioned resin composition, In relation to the total weight of the resin treatment, 2-acryloyloxyethyl succinate in an amount of 5 wt% to 10 wt%, A method for manufacturing a display device containing 5 wt% to 10 wt% of 4-hydroxybutyl acrylate.

9. The first plate has a first region and a second region surrounding the first region defined. In the step of providing the resin composition, The method for manufacturing a display device according to claim 8, wherein the resin composition is provided in the first region with a constant thickness and in the second region with a height difference in the thickness direction.

10. The method for manufacturing a display device according to claim 9, wherein the thickness of the resin composition applied to the first region is lower than the maximum thickness of the resin composition applied to the second region.

11. The resin composition applied to the second region is A method for manufacturing a display device according to claim 9, wherein the upper surface of the first plate includes a peak portion with the maximum thickness.

12. The method for manufacturing a display device according to claim 11, wherein the horizontal distance from the edge of the first plate coated with the resin composition to the peak portion is 300 μm or more and 600 μm or less.

13. The method for manufacturing a display device according to claim 8, wherein the resin composition has a viscosity of 15 mPa·s or more and 25 mPa·s or less at 25°C.

14. The resin composition is provided by an inkjet printing method, as described in claim 13, for the method of manufacturing the display device.

15. Display panel and, A window positioned on the aforementioned display panel, A display device comprising an adhesive member disposed between the display panel and the window, comprising a polymer derived from a resin composition containing 5 wt% to 10 wt% of 2-acryloyloxyethyl succinate and 5 wt% to 10 wt% of 4-hydroxybutyl acrylate, based on the total weight of the resin composition.

16. The display device according to claim 15, wherein the adhesive member has a storage modulus of 0.01 MPa or more and 0.1 MPa or less at 25°C.

17. The display device according to claim 15, wherein the adhesive member has a 180° peel force of 500 gf / 25 mm or more to at least one of the glass substrate and polymer substrate at a temperature of 25°C.

18. The display device according to claim 15, wherein the resin composition further comprises one or more urethane acrylate oligomers.

19. The display device according to claim 18, wherein the urethane acrylate oligomer has a weight-average molecular weight of 10,000 or more and 38,000 or less.

20. The display device according to claim 15, wherein the resin composition further comprises one or more (meth)acrylate monomers different from the 4-hydroxybutyl acrylate.

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