Display device and method of manufacturing same

Abstract

A display device and a method of manufacturing the same are provided. The method includes arranging a first adhesive material layer along a peripheral area of a display panel on the display panel including a central area and the peripheral area surrounding the central area; arranging the second adhesive material layer such that the second adhesive material layer overlaps the central region and the first portion of the first adhesive material layer; and arranging a third adhesive material layer on a second portion of the first adhesive material layer opposite the first portion, where the third adhesive material layer is separated from the second adhesive material layer.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and all benefits derived from Korean Patent Application No. 10-2023-0121346, filed on September 12, 2023, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] Embodiments supported by aspects of the present disclosure relate to a display device, and particularly, to a display device including a light emitting diode and a method of manufacturing the display device. Background Art

[0004] The display device can display data visually. Some display devices may include a display panel divided into a central area and a peripheral area. In some cases, a plurality of sub-pixels may be arranged in the central area. Each of the plurality of sub-pixels may include a light emitting diode. An image may be displayed in the central area by light emitted from the light emitting diode. The peripheral area may include various wiring, drivers, controllers, and other components that transmit electrical signals to the central area. In some cases, no image is displayed in the peripheral area.

[0005] A window may be placed on the display panel to protect the display panel. The window may be attached to the display panel via an adhesive layer. Summary of the invention

[0006] A liquid adhesive having a certain viscosity may be used to form an adhesive layer between the display panel and the window. The adhesive may be applied to the display panel in a liquid state. Since the adhesive has viscosity, the adhesive may form a certain inclination around the edge (e.g., the peripheral area) of the display panel. When the window is attached to the display panel, in order to prevent the generation of a space between the window and the display panel due to the inclination of the adhesive when the window is attached to the display panel, the adhesive may be additionally applied to the peripheral area. In this case, if the additional adhesive is too wide, its outline may extend beyond the peripheral area to the central area, and may be in the shape of a line visible to the user.

[0007] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the embodiments presented herein.

[0008] According to one or more embodiments, a display device includes a display panel, a window, a first adhesive layer, a second adhesive layer, and a third adhesive layer, the display panel including a central area and a peripheral area surrounding the central area, the window is disposed on the display panel, the first adhesive layer is between the display panel and the window and is arranged along the peripheral area of ​​the display panel, the second adhesive layer is between the display panel and the window and corresponds to the central area of ​​the display panel, and the third adhesive layer is between the display panel and the window and overlaps with a portion of an upper surface of the first adhesive layer in the peripheral area of ​​the display panel.

[0009] According to one or more embodiments, the second adhesive layer and the third adhesive layer may be separated from each other.

[0010] According to one or more embodiments, in a cross-sectional view, the first adhesive layer may include a peak where the thickness of the first adhesive layer is the largest, a first portion between the peak and a first edge adjacent to the central area, and a second portion between the peak and a second edge arranged opposite to the first edge, wherein the second adhesive layer may overlap with the first portion, and the third adhesive layer may overlap with the second portion.

[0011] According to one or more embodiments, the peak width of the third adhesive layer may be less than or equal to the width of the second portion.

[0012] According to one or more embodiments, the second adhesive layer may directly contact the first portion (eg, an upper surface of the first portion), and the third adhesive layer may directly contact the second portion (eg, an upper surface of the second portion).

[0013] According to one or more embodiments, the display device may further include a fourth adhesive layer between the display panel and the window and between the first adhesive layer and the second adhesive layer.

[0014] According to one or more embodiments, the fourth adhesive layer may directly contact a portion of an upper surface of the first adhesive layer and directly contact a portion of an upper surface of the second adhesive layer.

[0015] According to one or more embodiments, at least one of the first adhesive layer and the third adhesive layer may surround a central area in a plan view.

[0016] According to one or more embodiments, a method for manufacturing a display device may include: on a display panel including a central area and a peripheral area surrounding the central area, arranging a first adhesive material layer along the peripheral area of ​​the display panel; arranging a second adhesive material layer so that the second adhesive material layer overlaps with the central area and a first portion of the first adhesive material layer; and arranging a third adhesive material layer on a second portion of the first adhesive material layer opposite to the first portion, wherein the third adhesive material layer is separated from the second adhesive material layer.

[0017] According to one or more embodiments, in a cross-sectional view, the first adhesive material layer may include a peak having a maximum thickness, a first portion between the peak and a first edge adjacent to a central region, and a second portion between the peak and a second edge opposite to the first edge, wherein the second adhesive material layer may directly contact an upper surface of the first portion, and the third adhesive material layer may directly contact an upper surface of the second portion.

[0018] According to one or more embodiments, a distance measured from an edge of the third adhesive material layer to another edge of the third adhesive material layer in a direction parallel to the upper surface of the display panel may be less than or equal to a width of the second portion.

[0019] According to one or more embodiments, at least one of the first adhesive material layer and the third adhesive material layer may surround the central area in a plan view.

[0020] According to one or more embodiments, the method of manufacturing a display device may further include: semi-curing the first adhesive material layer by irradiating the first adhesive material layer with light; and semi-curing the second adhesive material layer and the third adhesive material layer by irradiating the second adhesive material layer and the third adhesive material layer with light, wherein the elastic modulus of the semi-cured second adhesive material layer and the elastic modulus of the semi-cured third adhesive material layer may be different from the elastic modulus of the semi-cured first adhesive material layer.

[0021] According to one or more embodiments, a method for manufacturing a display device includes: on a display panel including a central area and a peripheral area surrounding the central area, arranging a first adhesive material layer along the peripheral area of ​​the display panel; arranging a second adhesive material layer on the display panel separated from the first adhesive material layer and corresponding to the central area; arranging a third adhesive material layer on the first adhesive material layer; and arranging a fourth adhesive material layer between the first adhesive material layer and the second adhesive material layer.

[0022] According to one or more embodiments, in a cross-sectional view, the first adhesive material layer may include a peak having a maximum thickness, a first portion between the peak and a first edge adjacent to the central region, and a second portion between the peak and a second edge opposite to the first edge.

[0023] According to one or more embodiments, the third adhesive material layer may directly contact an upper surface of the second portion, and the fourth adhesive material layer may directly contact an upper surface of the first portion.

[0024] According to one or more embodiments, a distance measured from an edge of the third adhesive material layer to another edge of the third adhesive material layer in a direction parallel to the upper surface of the display panel may be less than or equal to a width of the second portion.

[0025] According to one or more embodiments, the second adhesive material layer and the third adhesive material layer may be separated from each other.

[0026] According to one or more embodiments, the method of manufacturing a display device may further include: semi-curing the first adhesive material layer and the second adhesive material layer by irradiating the first adhesive material layer and the second adhesive material layer with light; and semi-curing the third adhesive material layer and the fourth adhesive material layer by irradiating the third adhesive material layer and the fourth adhesive material layer with light.

[0027] According to one or more embodiments, the elastic modulus of the semi-cured first adhesive material layer and the elastic modulus of the semi-cured second adhesive material layer may be different from the elastic modulus of the semi-cured third adhesive material layer and the elastic modulus of the semi-cured fourth adhesive material layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other aspects, features and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 is a schematic perspective view of a display device according to an embodiment;

[0030] Figure 2 is a plan view of a portion of a display device according to an embodiment;

[0031] Figure 3A is a schematic plan view of a display device according to an embodiment;

[0032] Figure 3B is along Figure 3A A schematic cross-sectional view of a portion of the display device taken along line III-III';

[0033] Figure 4A is a schematic plan view of a display device according to an embodiment;

[0034] Figure 4B According to some embodiments, Figure 4A A schematic cross-sectional view of a portion of the display device taken along line IV-IV';

[0035] Figure 5A , Figure 5C and Figure 5D Each is a plan view of a display device in a processing state of a method of manufacturing a display device according to an embodiment;

[0036] Figure 5B , Figure 5E and Fig. 5F Each is a cross-sectional view of a display device in a processing state of a method of manufacturing a display device according to an embodiment;

[0037] Fig. 6A is a schematic plan view of a display device according to an embodiment.

[0038] Figure 6B According to some embodiments, Fig. 6A A schematic cross-sectional view of a portion of the display device taken along line VI-VI';

[0039] Fig. 7A , Figure 7C and Fig.7D each being a plan view of a display device in a processing state of a method of manufacturing a display device according to some embodiments;

[0040] Figure 7B , Fig. 7E and Figure 7F each is a cross-sectional view of a display device in a processing state of a method of manufacturing a display device according to some embodiments;

[0041] Fig. 8A and Figure 8B each is a plan view and a cross-sectional view of an enlarged central area in a processing state of a method of manufacturing a display device according to an embodiment;

[0042] Fig. 9 is a graph showing elastic modulus according to semi-curing rate;

[0043] Fig.10 is a graph showing visibility of streak stains according to semi-curing rates;

[0044] Fig.11 is a graph showing an application profile of an adhesive material layer according to the prior art and an application profile of an adhesive material layer according to an embodiment of the present disclosure; and

[0045] Fig.12 is a plan view of a display device manufactured by applying an adhesive material layer according to the related art. DETAILED DESCRIPTION

[0046] The embodiments shown in the accompanying drawings will now be referred to in detail, in which similar reference numerals refer to similar elements throughout. In this regard, the embodiments presented may have different forms and should not be construed as being limited to the descriptions set forth herein. Therefore, the embodiments are described below only by reference to the drawings to explain the various aspects of the description presented. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Throughout this disclosure, the expression "at least one of a, b, and c" indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0047] Since the present disclosure may have diversified modified embodiments, preferred embodiments are shown in the drawings and described in the detailed description. When referring to the embodiments described with reference to the drawings, the effects and characteristics of the present disclosure and the methods for achieving these will be apparent. However, the present disclosure may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0048] One or more embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. The same or corresponding elements are given the same reference numerals regardless of the figure numbers, and redundant descriptions thereof are omitted.

[0049] In the specification, the terms “first” and “second” are not used in a limited sense, and are used to distinguish one component from another.

[0050] As used herein, the singular expressions “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0051] It will also be understood that the terms “comprises” and / or “comprising” as used herein specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

[0052] It will be understood that when a layer, region or element is referred to as being “formed on” another layer, region or element, it can be directly or indirectly formed on the other layer, region or element. That is, for example, intervening layers, regions or elements may be present.

[0053] In the drawings, the size of components may be exaggerated or reduced for the convenience of description. In other words, since the size and thickness of elements in the drawings are arbitrarily shown for the convenience of description, the following embodiments are not limited thereto.

[0054] When a certain embodiment can be implemented differently, the specific process order can be performed differently from the described order. For example, two processes described in succession can be performed substantially simultaneously or in the reverse order of the described order.

[0055] In the specification, “A and / or B” means only A, only B, or both A and B. Also, the expression “at least one of A and B” may indicate A, B, or A and B.

[0056] In the embodiments below, it will be understood that when an element, region or layer is referred to as being connected to another element, region or layer, it can be directly and / or indirectly connected to the other element, region or layer. For example, in the specification, when a layer, region, component or the like is electrically connected to another layer, region, component or the like, the layer, region, component or the like can be directly electrically connected thereto and / or can be indirectly electrically connected thereto with an intervening layer, region, component or the like therebetween.

[0057] In the following examples, the x-axis, y-axis and z-axis are not limited to the three axes of the rectangular coordinate system, and can be interpreted as a broader meaning. For example, the x-axis, y-axis and z-axis can be perpendicular to each other, or can represent different directions that are not perpendicular to each other. In this specification, the directions represented by the x-axis, y-axis and z-axis can be referred to as the x-direction, y-direction and z-direction, respectively. In addition, the x-direction can mean the +x-direction, -x-direction or ±x-direction, the y-direction can mean the +y-direction, -y-direction or ±y-direction, and the z-direction can mean the +z-direction, -z-direction or ±z-direction.

[0058] The terms "about" or "approximately" as used herein include the stated value and include a suitable range of deviations for the particular value as determined by one of ordinary skill in the art, taking into account the errors associated with the measurements and the measurements of a particular quantity. For example, the term "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0059] Figure 1 is a schematic perspective view of a display device 1 according to an embodiment.

[0060] Reference Figure 1 , the display device 1 may include a central area CA and a peripheral area PA positioned outside the central area CA. The central area CA may display an image by means of a sub-pixel P arranged in the central area CA. The sub-pixel P may display an image by using a light-emitting diode corresponding to the sub-pixel P. The peripheral area PA is arranged outside the central area CA, does not display an image, and may surround the entire central area CA. A driver and / or other components for supplying an electrical signal or power to the central area CA may be arranged in the peripheral area PA. A pad may be arranged in the peripheral area PA, wherein an electronic device, a printed circuit board, or the like is electrically connected to the pad.

[0061] In an embodiment, Figure 1A polygon (e.g., rectangle) is shown in which the length of the central area CA in the x direction is less than the length of the central area CA in the y direction. However, in some embodiments, the polygon (e.g., rectangle) may have a central area whose length in the y direction is less than the length in the x direction. Figure 1 The central area CA is shown to be substantially rectangular, but the embodiment is not limited thereto. In some embodiments, the central area CA may have various shapes, such as, for example, an N-gon (where N is a natural number of 3 or more), a circle, or an ellipse. Figure 1 The corners of the central area CA are shown to include perpendicular points where straight lines intersect, but according to some embodiments, one or more corners in the polygonal central area CA may be curved corners (eg, rounded corners).

[0062] For the convenience of explanation, the case where the display device 1 is an electronic device (i.e., such as a smart phone) is described. However, the display device 1 of the present disclosure is not limited thereto. The display device 1 can be applied not only to portable electronic devices such as mobile phones, smart phones, tablet personal computers (PCs), mobile communication terminals, electronic notepads, e-books, portable multimedia players (PMPs), navigation devices, ultra-mobile PCs (UMPCs) and the like, but also to various products such as televisions, notebook computers, monitors, billboards and Internet of Things (IoT) devices. In some aspects, the display device 1 according to the embodiment can be used in wearable devices such as smart watches, watch phones, glasses displays and head-mounted displays (HMDs) as examples. In some aspects, the display device 1 according to the embodiment can be applied to the dashboard of a vehicle, a central information display (CID) arranged in the central instrument panel or dashboard of the vehicle, an inner rearview mirror display that replaces the side mirrors of the vehicle, and a display arranged on the rear surface of the front seat for entertainment of the rear seat of the vehicle.

[0063] Figure 2 is a plan view of a portion of a display device according to an embodiment.

[0064] Reference Figure 2 The display panel 10 may include a substrate 100 , a display layer 200 disposed on the substrate 100 , an encapsulation layer 300 disposed on the display layer 200 , a touch layer 400 disposed on the encapsulation layer 300 , and an optical function layer 500 disposed on the touch layer 400 .

[0065] The display layer 200 may include a plurality of sub-pixels and an insulating layer IL, and may be disposed on the substrate 100. In an embodiment, first to third sub-pixels P1 to P3 (hereinafter, also referred to as first sub-pixels P1, second sub-pixels P2, and third sub-pixels P3) may be disposed on the substrate 100. The first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 may include first, second, and third light emitting diodes LED1, LED2, and LED3, each of which may emit light of a fixed color.

[0066] The first light emitting diode LED1, the second light emitting diode LED2 and the third light emitting diode LED3 may respectively include first to third sub-pixel electrodes 1210 to 3210 (hereinafter, also referred to as the first sub-pixel electrode 1210, the second sub-pixel electrode 2210 and the third sub-pixel electrode 3210) and include first to third intermediate layers 1220 to 3220 (hereinafter, also referred to as the first intermediate layer 1220, the second intermediate layer 2220 and the third intermediate layer 3220) corresponding to the first light emitting diode LED1, the second light emitting diode LED2 and the third light emitting diode LED3, respectively.

[0067] The substrate 100 may include glass or plastic polymer resin. In the example where the substrate 100 includes polymer resin, the substrate 100 may have flexible, rollable or bendable properties. The substrate 100 may be formed into a multilayer structure including layers including polymer resin and an inorganic layer (not shown).

[0068] The first intermediate layer 1220, the second intermediate layer 2220 and the third intermediate layer 3220 corresponding to the first subpixel P1, the second subpixel P2 and the third subpixel P3, respectively, may be electrically connected to the first thin film transistor TFT1 to the third thin film transistor TFT3 (hereinafter, also referred to as the first thin film transistor TFT1, the second thin film transistor TFT2 and the third thin film transistor TFT3), respectively.

[0069] The first intermediate layer 1220 corresponding to the first subpixel P1 may be electrically connected to the first thin film transistor TFT1 through the first subpixel electrode 1210. The first thin film transistor TFT1 may include a first active layer AL1, a first gate electrode GE1 overlapping a portion of the first active layer AL1, and a first source electrode SE1 and a first drain electrode DE1 each directly contacting a portion of the first active layer AL1.

[0070] The second intermediate layer 2220 corresponding to the second subpixel P2 may be electrically connected to the second thin film transistor TFT2 through the second subpixel electrode 2210. The second thin film transistor TFT2 may include a second active layer AL2, a second gate electrode GE2 overlapping a portion of the second active layer AL2, and a second source electrode SE2 and a second drain electrode DE2 each directly contacting a portion of the second active layer AL2.

[0071] The third intermediate layer 3220 corresponding to the third subpixel P3 may be electrically connected to the third thin film transistor TFT3 through the third subpixel electrode 3210. The third thin film transistor TFT3 may include a third active layer AL3, a third gate electrode GE3 overlapping a portion of the third active layer AL3, and a third source electrode SE3 and a third drain electrode DE3 each directly contacting a portion of the third active layer AL3.

[0072] The first gate electrode GE1, the second gate electrode GE2 and the third gate electrode GE3 may have a single-layer or multi-layer structure including at least one material selected from aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), molybdenum (Mo), titanium (Ti), tungsten (W) and copper (Cu).

[0073] The display panel 10 may include a buffer layer 201 disposed between the first active layer AL1, the second active layer AL2, and the third active layer AL3 and the substrate 100. The buffer layer 201 may prevent penetration of impurities. The display panel 10 may include a gate insulating layer 203 disposed between the first active layer AL1 and the first gate electrode GE1, between the second active layer AL2 and the second gate electrode GE2, and between the third active layer AL3 and the third gate electrode GE3. The display panel 10 may include an interlayer insulating layer 205 disposed on the first gate electrode GE1, the second gate electrode GE2, and the third gate electrode GE3. Each of the buffer layer 201, the gate insulating layer 203, and the interlayer insulating layer 205 may include an inorganic insulating material, such as silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiON), aluminum oxide (Al 2 O 3 ), aluminum nitride (AlN x ), titanium oxide (TiO 2 ), titanium nitride (TiN x ) or the like as an example.

[0074] The first source electrode SE1, the second source electrode SE2, and the third source electrode SE3 may be disposed on the interlayer insulating layer 205, and may be respectively connected to the first active layer AL1, the second active layer AL2, and the third active layer AL3 through contact holes formed in the interlayer insulating layer 205 and the gate insulating layer 203. The first source electrode SE1, the second source electrode SE2, and the third source electrode SE3 may include Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo, Ti, W, or Cu, and may have a single-layer or multi-layer structure.

[0075] The first drain electrode DE1, the second drain electrode DE2, and the third drain electrode DE3 may be arranged on the interlayer insulating layer 205, and may be connected to the first active layer AL1, the second active layer AL2, and the third active layer AL3, respectively, through contact holes formed in the interlayer insulating layer 205 and the gate insulating layer 203. The first drain electrode DE1, the second drain electrode DE2, and the third drain electrode DE3 may each include Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo, Ti, W, or Cu, and may have a single-layer or multi-layer structure. In some embodiments, the first source electrode SE1, the second source electrode SE2, and the third source electrode SE3 and the first drain electrode DE1, the second drain electrode DE2, and the third drain electrode DE3 may include the same material. For example, the source electrode of a specified thin film transistor (e.g., the first source electrode SE1 of the first thin film transistor TFT1) may include the same material as the drain electrode (e.g., the first drain electrode DE1) of the thin film transistor.

[0076] A first organic insulating layer 207 may be provided on the first thin film transistor TFT1, the second thin film transistor TFT2, and the third thin film transistor TFT3. For example, the first organic insulating layer 207 may cover the first source electrode SE1, the second source electrode SE2, and the third source electrode SE3 and the first drain electrode DE1, the second drain electrode DE2, and the third drain electrode DE3. The first organic insulating layer 207 may include an organic insulating material, such as, for example, an acryl-based material, benzocyclobutene, polyimide, or hexamethyldisiloxane. The first organic insulating layer 207 may include a plurality of contact holes. For example, the first organic insulating layer 207 may include a plurality of contact holes respectively overlapping the first drain electrode DE1, the second drain electrode DE2, and the third drain electrode DE3.

[0077] The display panel 10 may include a contact metal CM disposed on the first organic insulating layer 207. The contact metal CM may include a material such as Al, Cu and / or Ti, and may be formed as a single layer or multilayer structure including these materials. The display panel 10 may include a plurality of contact metals CM, and the contact metals CM may overlap with the first drain electrode DE1, the second drain electrode DE2, and the third drain electrode DE3, respectively. A portion of each of the contact metals CM may be disposed in a corresponding contact hole formed in the first organic insulating layer 207. For example, each contact metal CM may directly contact a corresponding one of the first drain electrode DE1, the second drain electrode DE2, and the third drain electrode DE3 through a contact hole formed in the first organic insulating layer 207.

[0078] The display panel 10 may include a second organic insulating layer 209 disposed between the first organic insulating layer 207 and the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210. The second organic insulating layer 209 may include an organic insulating material, such as, for example, an acryl-based material, benzocyclobutene, polyimide, or hexamethyldisiloxane. The second organic insulating layer 209 may include contact holes respectively overlapping with the plurality of contact metals CM.

[0079] The first subpixel electrode 1210, the second subpixel electrode 2210, and the third subpixel electrode 3210 may be disposed on the second organic insulating layer 209. The first subpixel electrode 1210, the second subpixel electrode 2210, and the third subpixel electrode 3210 may be formed as reflective electrodes. The first subpixel electrode 1210, the second subpixel electrode 2210, and the third subpixel electrode 3210 may be formed by forming a reflective layer with Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a compound thereof and then disposing an indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium oxide (InO) on the reflective layer. 2 O 3 ) film. In an embodiment, the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210 may have a structure in which an ITO layer, an Ag layer, and an ITO layer are sequentially stacked. The embodiments of the present disclosure are not limited thereto, and the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210 may be formed of various materials and may be modified to various structures such as a single-layer or multi-layer structure as an example.

[0080] The first subpixel electrode 1210 , the second subpixel electrode 2210 , and the third subpixel electrode 3210 may be electrically connected to the contact metals CM respectively overlapping the contact holes formed in the second organic insulating layer 209 through the contact holes formed in the second organic insulating layer 209 .

[0081] Although according to the reference Figure 2 In the described embodiment, the first thin film transistor TFT1, the second thin film transistor TFT2, and the third thin film transistor TFT3 are electrically connected to the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210 through the contact metal CM, respectively, but the embodiments of the present disclosure are not limited thereto. In some embodiments, the contact metal CM may be omitted, and a single organic insulating layer may be arranged between the first thin film transistor TFT1, the second thin film transistor TFT2, and the third thin film transistor TFT3 and the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210. In another embodiment, three or more organic insulating layers may be arranged between the first thin film transistor TFT1, the second thin film transistor TFT2, and the third thin film transistor TFT3 and the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210, respectively, and the first thin film transistor TFT1, the second thin film transistor TFT2, and the third thin film transistor TFT3 may be electrically connected to the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210 through the contact metal CM.

[0082] The display panel 10 may include a sub-pixel defining layer 211 covering edge regions (or edges) of the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210. In other words, for example, the sub-pixel defining layer 211 may include a plurality of openings exposing a central portion of each of the first sub-pixel electrode 1210, the second sub-pixel electrode 2210, and the third sub-pixel electrode 3210. Each opening of the sub-pixel defining layer 211 may define a corresponding emission region of the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3. For example, the opening of the sub-pixel defining layer 211 may define a first emission region EA1, a second emission region EA2, and a third emission region EA3 corresponding to the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3, respectively.

[0083] The first intermediate layer 1220, the second intermediate layer 2220, and the third intermediate layer 3220 may be disposed on the first subpixel electrode 1210, the second subpixel electrode 2210, and the third subpixel electrode 3210, respectively. For example, the first intermediate layer 1220 may be disposed on the first subpixel electrode 1210 in the opening of the subpixel defining layer 211. The second intermediate layer 2220 may be disposed on the second subpixel electrode 2210 in the opening of the subpixel defining layer 211. The third intermediate layer 3220 may be disposed on the third subpixel electrode 3210 in the opening of the subpixel defining layer 211.

[0084] The first intermediate layer 1220, the second intermediate layer 2220, and the third intermediate layer 3220 may each include an emission layer including a low molecular weight or high molecular weight material. The first intermediate layer 1220, the second intermediate layer 2220, and the third intermediate layer 3220 may each have a single-layer or multi-layer structure including a hole injection layer, a hole transport layer, an emission layer, an electron transport layer, and / or an electron injection layer.

[0085] The display panel 10 may include an opposing electrode 230 disposed on each of the first intermediate layer 1220, the second intermediate layer 2220, and the third intermediate layer 3220. The opposing electrode 230 may be formed integrally to cover the first intermediate layer 1220, the second intermediate layer 2220, and the third intermediate layer 3220. The opposing electrode 230 may be provided as a transparent (or transflective) electrode. In the example of a transparent (or transflective) opposing electrode 230, the opposing electrode 230 may include one or more materials selected from Ag, Al, Mg, Li, Ca, Cu, MgAg, and CaAg, and may be a thin film having a thickness of several to tens of nanometers (nm). For example, the opposing electrode 230 may have a multilayer structure such as LiF / Ca, LiF / Al. The structure and material of the opposing electrode 230 are not limited thereto, and various modifications are possible.

[0086] The encapsulation layer 300 may be disposed on the opposite electrode 230. The encapsulation layer 300 may include at least one inorganic encapsulation layer and at least one organic encapsulation layer. Figure 2 As shown in FIG. 1 , the encapsulation layer 300 includes a first inorganic encapsulation layer 310 , an organic encapsulation layer 320 , and a second inorganic encapsulation layer 330 , which are sequentially stacked.

[0087] The first inorganic encapsulation layer 310 and the second inorganic encapsulation layer 330 may include an inorganic insulating material, such as SiO x 、SiN x 、SiON、Al 2 O 3 、TiO 2 Tantalum oxide (Ta 2 O 5 ), hafnium oxide (HfO 2 ), zinc oxide (ZnO), or the like as an example. The first inorganic encapsulating layer 310 and the second inorganic encapsulating layer 330 may each have a single-layer or multi-layer structure including one or more of the inorganic insulating materials.

[0088] The organic encapsulation layer 320 can relieve the internal stress of the first inorganic encapsulation layer 310 and / or the second inorganic encapsulation layer 330. The organic encapsulation layer 320 may include a polymer material. For example, the organic encapsulation layer 320 may include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, acrylic resin (e.g., polymethyl methacrylate, polyacrylic acid, or the like) or a combination thereof.

[0089] The encapsulation layer 300 may have a multi-layer structure including a first inorganic encapsulation layer 310, an organic encapsulation layer 320, and a second inorganic encapsulation layer 330. In this case, even if cracks are generated in the encapsulation layer 300, the multi-layer structure may prevent cracks from being formed between the first inorganic encapsulation layer 310 and the organic encapsulation layer 320 and / or between the organic encapsulation layer 320 and the second inorganic encapsulation layer 330. The encapsulation layer 300 may prevent or minimize penetration of external moisture or oxygen into the display layer 200.

[0090] Despite Figure 2 Although not shown, in some embodiments of the present disclosure, the display panel 10 may further include a covering layer disposed between the encapsulation layer 300 and the opposite electrode 230. For example, in some embodiments of the present disclosure, the display panel 10 may further include a covering layer (not shown) between the first inorganic encapsulation layer 310 and the opposite electrode 230. The covering layer may improve the light emission efficiency of the first light emitting diode LED1, the second light emitting diode LED2, and the third light emitting diode LED3 through the principle of constructive interference.

[0091] The touch layer 400 may be disposed on the encapsulation layer 300. The touch layer 400 may include a first touch insulating layer 410, a first conductive layer 420, a second touch insulating layer 430, a second conductive layer 440, and a third touch insulating layer 450.

[0092] The first touch insulating layer 410 may be disposed on the second inorganic encapsulation layer 330 of the encapsulation layer 300 and planarize the surface on which the first conductive layer 420 is disposed. The first touch insulating layer 410 may include an inorganic insulating material such as SiO x 、SiN x , SiON and the like are used as examples. In some embodiments, the first touch insulating layer 410 may include an organic insulating material. In some embodiments, the first touch insulating layer 410 may be omitted, and the first conductive layer 420 may be disposed on the second inorganic encapsulation layer 330 of the encapsulation layer 300.

[0093] The second touch insulating layer 430 may be disposed on the first conductive layer 420. The second touch insulating layer 430 may include an inorganic or organic material. In an example where the second touch insulating layer 430 is an inorganic material, the second touch insulating layer 430 may include a material selected from silicon nitride (SiN x ), aluminum nitride (AlN x ), zirconium nitride (ZrN x ), titanium nitride (TiN x ), Hafnium Nitride (HfN x ), tantalum nitride (TaN x ), silicon oxide (SiO x ), aluminum oxide (AlO x ), titanium oxide (TiO x ), tin oxide (SnO x ), cerium oxide (CeO x ) and silicon oxynitride (SiON). In an example where the second touch insulating layer 430 is an organic material, the second touch insulating layer 430 may include at least one material selected from a group including acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, urethane resin, cellulose resin, and perylene resin.

[0094] The second conductive layer 440 may be disposed on the second touch insulating layer 430. The second conductive layer 440 may be used as a sensor for detecting a user's touch input. The second conductive layer 440 may support detecting a user's touch input. The first conductive layer 420 may be used as a connector for connecting the patterned second conductive layer 440 in one direction. The first conductive layer 420 may support electrical connection of the patterned second conductive layer 440 with one or more other layers or components. In an embodiment, both the first conductive layer 420 and the second conductive layer 440 may be used as sensors. In this case, the first conductive layer 420 and the second conductive layer 440 may be electrically connected to each other through a contact hole. In an example where both the first conductive layer 420 and the second conductive layer 440 are used as sensors, the resistance of the touch electrode may be reduced, and the display panel 10 may support relatively fast detection of a user's touch input.

[0095] In an embodiment, the first conductive layer 420 and the second conductive layer 440 may have a structure through which light emitted from the light emitting diode can pass. For example, the first conductive layer 420 and the second conductive layer 440 may have a mesh structure. In this case, the first conductive layer 420 and the second conductive layer 440 may not overlap with the emission area of ​​the light emitting diode.

[0096] The first conductive layer 420 and the second conductive layer 440 may include a metal layer or a transparent conductive layer. The metal layer may include Mo, Ag, Ti, Cu, Al, and alloys thereof. The transparent conductive layer may include a transparent conductive oxide such as ITO, IZO, ZnO, indium tin zinc oxide (ITZO), a conductive polymer such as poly (3,4) -ethylene dioxythiophene (PEDOT), a metal nanowire, a carbon nanotube, graphene, or the like.

[0097] The third touch insulating layer 450 may be disposed on the second conductive layer 440. The third touch insulating layer 450 may include an inorganic or organic material. In an example where the third touch insulating layer 450 is an inorganic material, the third touch insulating layer 450 may include an inorganic material selected from the group consisting of SiN x 、AlN x 、ZrN x 、TiN x , HfN x 、TaN x 、SiO x 、AlO x 、TiO x SnO x 、CeO x In an example where the third touch insulating layer 450 is an organic material, the third touch insulating layer 450 may include at least one material selected from a group including acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, urethane resin, cellulose resin, and perylene resin.

[0098] The optical function layer 500 may be disposed on the touch layer 400. Figure 2 Although not shown in the figure, the optical function layer 500 may include a light shielding layer (not shown) capable of reflecting external light. The optical function layer 500 may include a color filter arranged corresponding to the emission area of ​​each sub-pixel. For example, the optical function layer 500 may include a color filter (not shown) corresponding to the first emission area EA1, the second emission area EA2, and the third emission area EA3.

[0099] Figure 3A is a schematic plan view of a display device 1 according to an embodiment.

[0100] Reference Figure 3A , the display device 1 may include a display panel 10 , an adhesive layer 20 , and a window 30 .

[0101] The adhesive layer 20 may include a first adhesive layer 21 to a third adhesive layer 23 (hereinafter, also referred to as the first adhesive layer 21, the second adhesive layer 22, and the third adhesive layer 23). The first adhesive layer 21, the second adhesive layer 22, and the third adhesive layer 23 may each include an optically transparent adhesive. For example, the first adhesive layer 21, the second adhesive layer 22, and the third adhesive layer 23 may include an optically transparent resin (OCR). In an embodiment, the first adhesive layer 21, the second adhesive layer 22, and the third adhesive layer 23 may include the same material.

[0102] The first adhesive layer 21 may be disposed on the display panel 10 corresponding to the peripheral area PA. The first adhesive layer 21 may have an approximately frame shape surrounding the central area CA.

[0103] The second adhesive layer 22 may be disposed on the display panel 10 corresponding to the central area CA. A portion of the second adhesive layer 22 may overlap the peripheral area PA and the first adhesive layer 21. The region where the second adhesive layer 22 overlaps the first adhesive layer 21 may have an approximately frame shape surrounding the central area CA.

[0104] The third adhesive layer 23 may be disposed on the display panel 10 corresponding to the peripheral area PA. The third adhesive layer 23 may overlap the first adhesive layer 21. The outer edge of the third adhesive layer 23 may overlap the edge of the display panel 10. The width of the third adhesive layer 23 may be smaller than the width of the first adhesive layer 21. The third adhesive layer 23 may have an approximate frame shape surrounding the central area CA and / or the second adhesive layer 22.

[0105] The second adhesive layer 22 and the third adhesive layer 23 may cover the upper surface of the first adhesive layer 21. In an implementation, the entire upper surface of the first adhesive layer 21 may be covered by the second adhesive layer 22 and the third adhesive layer 23.

[0106] Figure 3B According to the implementation method Figure 3A Schematic cross-sectional view of a portion of the display device 1 taken along line III-III'.

[0107] Reference Figure 3B , the adhesive layer 20 may be disposed between the display panel 10 and the window 30. For example, the adhesive layer 20 may be disposed on the upper surface of the display panel 10, and the window 30 may be disposed on the upper surface of the adhesive layer 20.

[0108] The adhesive layer 20 may include a first adhesive layer 21 , a second adhesive layer 22 , and a third adhesive layer 23 .

[0109] The first adhesive layer 21 may be disposed on the upper surface of the display panel 10 in the peripheral area PA.

[0110] From a cross-sectional view (e.g., from the +y direction or the -y direction), the width 21-W of the first adhesive layer 21 may be variable (e.g., may not be constant). In an embodiment, the width 21-W of the first adhesive layer 21 may change along the ±z direction. For example, the first adhesive layer 21 may have a substantially semicircular shape in which the lower surface contacting the display panel 10 is the peak width 21-Wmax of the first adhesive layer 21 and the width 21-W decreases along the +z direction. The embodiments of the present disclosure are not limited thereto, and various modifications may be made to the cross-sectional shape of the first adhesive layer 21.

[0111] In an implementation, the first adhesive layer 21 may cover the entire peripheral area PA. For example, the width or peak width 21-Wmax of the lower surface of the first adhesive layer 21 may be equal to the width PA-W of the peripheral area PA.

[0112] The thickness of the first adhesive layer 21 may be variable (e.g., may not be constant). For example, the thickness of the first adhesive layer 21 may vary along the ±x direction. The portion with the largest thickness of the first adhesive layer 21 may be defined as the peak 21-P of the first adhesive layer 21. Among the edges of the first adhesive layer 21, the edge adjacent to the central area CA may be defined as the first edge 21-E1. The edge positioned on the opposite side of the first edge 21-E1 among the edges of the first adhesive layer 21 may be defined as the second edge 21-E2. In this case, the portion of the first adhesive layer 21 arranged between the peak 21-P and the first edge 21-E1 may be understood as the first portion A1, and the portion of the first adhesive layer 21 arranged between the peak 21-P and the second edge 21-E2 may be understood as the second portion A2. In an embodiment, the cross-sectional shape of the first adhesive layer 21 may be substantially semicircular, and the width A1-W of the first portion A1 may be substantially equal to the width A2-W of the second portion A2.

[0113] The second adhesive layer 22 may be disposed on the display panel 10 corresponding to the central area CA.

[0114] Portions of the second adhesive layer 22 may extend to the peripheral area PA. In an embodiment, an edge of the second adhesive layer 22 may contact the first edge 21 - E1 of the first adhesive layer 21 , and another edge of the second adhesive layer 22 may contact the peak 21 -P of the first adhesive layer 21 .

[0115] The second adhesive layer 22 may overlap with the first portion A1 of the first adhesive layer 21 in the peripheral area PA. For example, the second adhesive layer 22 may cover at least a portion of the first portion A1 of the first adhesive layer 21. In other words, for example, the space between the first adhesive layer 21 (or the first portion A1) and the window 30 may be at least partially filled with the second adhesive layer 22 in the region of the first adhesive layer 21 overlapping with the first portion A1 of the first adhesive layer 21. Therefore, the thickness of the second adhesive layer 22 is not constant and may change along the ±x direction in the region overlapping with the first portion A1 of the first adhesive layer 21.

[0116] The second adhesive layer 22 may directly contact the first portion A1 of the first adhesive layer 21. For example, the second adhesive layer 22 may cover at least a portion of the first portion A1 while directly contacting an upper surface of the first portion A1 of the first adhesive layer 21.

[0117] The third adhesive layer 23 may be disposed on the display panel 10 in the peripheral area PA. For example, the third adhesive layer 23 may be disposed on the first adhesive layer 21 in the peripheral area PA.

[0118] The third adhesive layer 23 may overlap a portion of the upper surface of the first adhesive layer 21. For example, an edge of the third adhesive layer 23 may contact the second edge 21-E2 of the first adhesive layer 21 (or the edge of the display panel 10), and another edge of the third adhesive layer 23 may contact the peak 21-P of the first adhesive layer 21.

[0119] The third adhesive layer 23 may overlap with the second portion A2 of the first adhesive layer 21 in the peripheral area PA. For example, the third adhesive layer 23 may cover at least a portion of the second portion A2 of the first adhesive layer 21. In other words, for example, the space between the first adhesive layer 21 (or the second portion A2) and the window 30 may be at least partially filled with the third adhesive layer 23 in the region of the first adhesive layer 21 overlapping with the second portion A2 of the first adhesive layer 21. Therefore, the thickness of the third adhesive layer 23 is not constant and may change along the ±x direction.

[0120] In some aspects, the width 23-W of the third adhesive layer 23 is not constant and may change along the ±z direction. For example, the width 23-W of the third adhesive layer 23 may be a peak width 23-Wmax in the upper surface of the contact window 30 and may decrease along the -z direction. The peak width 23-Wmax of the third adhesive layer 23 may be equal to or less than the width A2-W of the second portion A2 of the first adhesive layer 21.

[0121] The third adhesive layer 23 may directly contact the second portion A2 of the first adhesive layer 21. For example, the third adhesive layer 23 may directly contact an upper surface of the second portion A2 of the first adhesive layer 21 and cover at least a portion of the second portion A2.

[0122] The second adhesive layer 22 and the third adhesive layer 23 may cover the entire upper surface of the first adhesive layer 21. For example, the second adhesive layer 22 and the third adhesive layer 23 may cover the upper surfaces of the first portion A1 and the second portion A2 of the first adhesive layer 21, respectively, and may contact each other at the peak 21-P of the first adhesive layer 21. The embodiments of the present disclosure are not limited thereto, and in some embodiments, the second adhesive layer 22 and the third adhesive layer 23 may cover portions of the first portion A1 and the second portion A2 of the first adhesive layer 21, respectively. In this case, portions of the first adhesive layer 21 may be exposed. For example, in an area adjacent to the peak 21-P of the first adhesive layer 21, the first adhesive layer 21 may not be covered by the second adhesive layer 22 or the third adhesive layer 23. Figure 4A and Figure 4B Such an embodiment is described.

[0123] Figure 4A is a schematic plan view of a display device 1 according to an embodiment.

[0124] Reference Figure 4A , a portion of the first adhesive layer 21 may not be covered by the second adhesive layer 22 and the third adhesive layer 23. The portion of the first adhesive layer 21 not covered by the second adhesive layer 22 and the third adhesive layer 23 may be disposed between the second adhesive layer 22 and the third adhesive layer 23. The portion of the first adhesive layer 21 not covered by the second adhesive layer 22 and the third adhesive layer 23 may have an approximately frame shape surrounding the central area CA.

[0125] Figure 4B According to some embodiments, Figure 4A Schematic cross-sectional view of a portion of the display device 1 taken along line IV-IV′.

[0126] Reference Figure 4B , the first adhesive layer 21 may include a third portion A3 disposed between the first portion A1 and the second portion A2. The third portion A3 may not be covered by the second adhesive layer 22 and the third adhesive layer 23. Therefore, the third portion A3 of the first adhesive layer 21 may directly contact the window 30.

[0127] The third portion A3 of the first adhesive layer 21 may have a constant thickness. The thickest portion of the first adhesive layer 21 may be an area, not a point. For example, the third portion A3 may be the thickest portion of the first adhesive layer 21, and the peak 21-P of the first adhesive layer 21 may be any point on the third portion A3. Alternatively, the peak 21-P of the first adhesive layer 21 may be defined as the upper surface of the third portion A3. Therefore, for example, the two sides of the first adhesive layer 21 (e.g., the first portion A1 and the second portion A2) may be an arc shape, and the first adhesive layer 21 may have an approximate platform shape with a flat upper surface (e.g., the third portion A3).

[0128] The second adhesive layer 22 and the third adhesive layer 23 may cover upper surfaces of the first portion A1 and the second portion A2 of the first adhesive layer 21 , respectively, and may contact each other through the third portion A3 of the first adhesive layer 21 .

[0129] Figure 5A , Figure 5C and Figure 5D Each is a plan view of a display device in a processing state of a method of manufacturing a display device according to an embodiment.

[0130] Figure 5B , Figure 5E and Fig. 5F Each is a cross-sectional view of a display device in a processing state of a method of manufacturing a display device according to an embodiment.The terms method and process may be used interchangeably herein.

[0131] Figure 5A and Figure 5B 1 and 2 are respectively a plan view and a cross-sectional view of a display device according to a process of forming the first adhesive material layer 121 . Figure 5C , Figure 5D and Figure 5E Each is a plan view or a cross-sectional view of a display device according to a process of forming the second adhesive material layer 122 and the third adhesive material layer 123 . Fig. 5F is a cross-sectional view of a display device according to a process of pressing the window 30. Hereinafter, in an example, the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 may include the same material.

[0132] Reference Figure 5A , the process may include forming a first adhesive material layer 121 on the display panel 10 .

[0133] The process of forming the first adhesive material layer 121 may include applying the adhesive material through the first injection device 2 - 1 and semi-curing through the first curing device 3 - 1 .

[0134] First, the process may include applying an adhesive material (eg, OCR) included in the first adhesive material layer 121 to the display panel 10 by using the first injection device 2 - 1 .

[0135] The first injection device 2-1 may be an inkjet injection device including a plurality of heads H. The first injection device 2-1 may include a nozzle (not shown) for injecting an adhesive material, a storage unit (not shown) for storing the adhesive material, and a pump (not shown) for supplying the adhesive material to the nozzle.

[0136] The process may include controlling the first injection device 2-1 so that the adhesive material is injected from a predetermined head H for the first adhesive material layer 121 so as to be applied to the peripheral area PA of the display panel 10 accordingly without being injected from other heads H. For example, the process may include controlling some (e.g., not all) of the plurality of heads H of the first injection device 2-1 overlapping the peripheral area PA to inject the adhesive material so that the first adhesive material layer 121 is applied to the peripheral area PA.

[0137] The process may include moving the first injection device 2-1 in a direction at a certain speed, and injecting the adhesive material using the first injection device 2-1. For example, the first injection device 2-1 may move in the +y direction at a first speed v1, and inject the adhesive material. In this case, the process may include appropriately controlling the injection amount of the first injection device 2-1 per second and controlling the first speed v1 so that the first adhesive material layer 121 is completely applied with a constant thickness.

[0138] The adhesive material applied by the first injection device 2-1 may be in a liquid state having a certain viscosity. If the adhesive material is in the above state, the adhesive material moves to the outside of the display panel 10 or moves to the central area CA.

[0139] In order to prevent such a situation (e.g., unintentional or undesirable movement of the adhesive material), the process may include performing semi-curing of the adhesive material. For example, the process may include performing semi-curing of the first adhesive material layer 121 after applying the first adhesive material layer 121 by injecting the adhesive material using the first injection device 2-1 (e.g., immediately after applying the first adhesive material layer 121 by injecting the adhesive material using the first injection device 2-1).

[0140] The process may include emitting light of a predetermined wavelength band using the first curing device 3-1 that can perform irradiation. For example, the first curing device 3-1 may emit light of a wavelength band (e.g., ultraviolet light) that can harden or cure the adhesive material injected by the first injection device 2-1. The description of emitting light of a wavelength band herein includes irradiating an object (e.g., the first adhesive material layer 121, other adhesive material layers, and the like) with light of a wavelength band.

[0141] The process may include controlling the first curing device 3-1 and the first injection device 2-1 so that the first curing device 3-1 follows behind the first injection device 2-1 in the same direction as the first injection device 2-1. In an embodiment, the process may include moving the first injection device 2-1 and the first curing device 3-1 in the +y direction, and the first curing device 3-1 may be separated from the first injection device 2-1 by a first distance D1 in the -y direction (for example, during movement and light emission of the first injection device 2-1 and the first curing device 3-1). The moving speed of the first injection device 2-1 and the first curing device 3-1 may be equal to the first speed v1. Therefore, for example, the first injection device 2-1 and the first curing device 3-1 may be separated from each other by a first distance D1, and both may move in the +y direction at the first speed v1.

[0142] The process may include controlling the first curing device 3-1 in association with controlling the amount of light incident on the first adhesive material layer 121. The amount of emitted light incident on the first adhesive material layer 121 may be controlled in the first curing device 3-1. For example, the process may include controlling the first speed v1 so that the first adhesive material layer 121 is not completely cured (e.g., semi-cured) but has a certain elastic modulus. In an example of the process, the intensity of the light emitted from the first curing device 3-1 (and the corresponding intensity of the light at the first adhesive material layer 121) may be controlled according to the first speed v1 so that the first adhesive material layer 121 is not completely cured but semi-cured while having a certain elastic modulus. The first adhesive material layer 121 semi-cured by irradiating the first adhesive material layer 121 with light using the first curing device 3-1 may have a certain elastic modulus and may maintain a certain shape. In an example, based on semi-curing, the first adhesive material layer 121 may maintain the shape until a subsequent process.

[0143] Figure 5B is along Figure 5A A cross-sectional view of the display device taken along line Vb-Vb'.

[0144] Reference Figure 5B The process may include disposing a first adhesive material layer 121 on the display panel 10, and semi-curing the first adhesive material layer 121 so that the first adhesive material layer 121 maintains a certain shape. The process may include arranging the first adhesive material layer 121 corresponding to the peripheral area PA.

[0145] The thickness of the first adhesive material layer 121 may be variable (e.g., may not be constant). For example, the thickness of the first adhesive material layer 121 may change along the ±x direction. The portion of the first adhesive material layer 121 where the thickness is the largest may be defined as the peak 121-P of the first adhesive material layer 121. Among the edges of the first adhesive material layer 121, the edge adjacent to the central area CA may be defined as the first edge 121-E1. The edge of the first adhesive material layer 121 positioned on the opposite side of the first edge 121-E1 may be defined as the second edge 121-E2. In this case, the portion of the first adhesive material layer 121 arranged between the peak 121-P and the first edge 121-E1 may be referred to as the first portion A1, and the portion of the first adhesive material layer 121 arranged between the peak 121-P and the second edge 121-E2 may be referred to as the second portion A2. In an implementation, the cross-sectional shape of the first adhesive material layer 121 may be substantially semi-elliptical, and the width A1 -W of the first portion A1 may be substantially equal to the width A2 -W of the second portion A2 .

[0146] Reference Figure 5C , the process may include reference to Figure 5A The second adhesive material layer 122 and the third adhesive material layer 123 are formed on the display panel 10 described in the embodiment shown in FIG.

[0147] The process of forming the second adhesive material layer 122 and the third adhesive material layer 123 may include applying the adhesive material through the second injection device 2 - 2 and semi-curing through the second curing device 3 - 2 .

[0148] First, the process may include applying the adhesive material included in the second adhesive material layer 122 and the third adhesive material layer 123 to the Figure 5A . In an embodiment, the adhesive material included in the second adhesive material layer 122 and the third adhesive material layer 123 may be the same adhesive material (e.g., OCR) as the material included in the first adhesive material layer 121. In an embodiment, the process may include applying the second adhesive material layer 122 and applying the third adhesive material layer 123 simultaneously.

[0149] Similar to the process of applying the first adhesive material layer 121, the process may include applying the second adhesive material layer 122 and the third adhesive material layer 123 according to the desired shape by controlling the head H of the second injection device 2-2. For example, the process may include controlling the second injection device 2-2 so that the head H of the second injection device 2-2 injects the adhesive material corresponding to the central area CA to apply the second adhesive material layer 122, and so that the adhesive material is injected corresponding to the peripheral area PA to apply the third adhesive material layer 123. In this case, the process may include controlling the second injection device 2-2 so that the adhesive material is prevented from being injected by a certain part of the plurality of heads H (for example, the adhesive material is not injected from a certain part of the plurality of heads H), thereby separating the second adhesive material layer 122 and the third adhesive material layer 123 from each other.

[0150] The process may include moving the second injection device 2-2 in one direction at a certain speed, and injecting the adhesive material using the second injection device 2-2. For example, the second injection device 2-2 may move at a second speed v2 in the +y direction, and inject the adhesive material. In this case, the process may include appropriately controlling the injection volume per second of the second injection device 2-2 and the second speed v2, so that the second adhesive material layer 122 and the third adhesive material layer 123 are completely applied with a constant thickness. In some embodiments, the second speed v2 may be equal to the first speed v1 ( Figure 5A ). In some other embodiments, the second speed v2 may be different from the first speed v1.

[0151] Similar to the process of semi-curing the first adhesive material layer 121, the process may include semi-curing the second adhesive material layer 122 and the third adhesive material layer 123. For example, the process may include semi-curing the second adhesive material layer 122 and the third adhesive material layer 123 after applying the second adhesive material layer 122 and the third adhesive material layer 123 by injecting the adhesive material using the second injection device 2-2 (for example, immediately after applying the second adhesive material layer 122 and the third adhesive material layer 123 by injecting the adhesive material using the second injection device 2-2, after one or more intermediate operations).

[0152] The process may include emitting light of a predetermined wavelength band using the second curing device 3-2. For example, the second curing device 3-2 may emit light of a wavelength band (eg, ultraviolet light) capable of hardening or curing the adhesive material injected by the second injection device 2-2.

[0153] The second curing device 3-2 may follow behind the second injection device 2-2 in the same direction as the second injection device 2-2. In an embodiment, the second injection device 2-2 and the second curing device 3-2 may be movable in the +y direction. The second curing device 3-2 may be separated from the second injection device 2-2 in the -y direction by a second distance D2. The moving speed of the second injection device 2-2 and the second curing device 3-2 may be equal to the second speed v2. Therefore, the second injection device 2-2 and the second curing device 3-2 may be separated from each other by a second distance D2, and both may move in the +y direction at the second speed v2. In some embodiments, the second distance D2 may be different from the first distance D1 ( Figure 5A ). For example, the second distance D2 may be smaller than the first distance D1 ( Figure 5A ).

[0154] The process may include controlling the second curing device 3-2 in association with controlling the amount of light incident on the second adhesive material layer 122. The amount of emitted light incident on the second adhesive material layer 122 and the third adhesive material layer 123 may be controlled in the second curing device 3-2. For example, the process may include controlling the second speed v2 so that the second adhesive material layer 122 and the third adhesive material layer 123 are not completely cured (e.g., semi-cured) but have a certain elastic modulus. In an example of the process, the intensity of the light emitted from the second curing device 3-2 (and the corresponding intensity of the light at the second adhesive material layer 122 and the third adhesive material layer 123) may be controlled according to the second speed v2 so that the second adhesive material layer 122 and the third adhesive material layer 123 are not completely cured but semi-cured while having a certain elastic modulus. The second adhesive material layer 122 and the third adhesive material layer 123 semi-cured by irradiating the second adhesive material layer 122 and the third adhesive material layer 123 with light using the second curing device 3-2 may have a certain elastic modulus and may maintain a certain shape. In an example, upon semi-curing, the second adhesive material layer 122 and the third adhesive material layer 123 may maintain the shape until a subsequent process.

[0155] In the process of emitting light by using the second curing device 3-2, the process may include exposing the second adhesive material layer 122 and the third adhesive material layer 123 to the light emitted by the second curing device 3-2, and further, exposing the first adhesive material layer 121 to the light irradiated by the second curing device 3-2. Therefore, the first adhesive material layer 121 may show an effect of being semi-cured twice. The elastic modulus of the first adhesive material layer 121 may be different from the elastic modulus of the second adhesive material layer 122 and the third adhesive material layer 123.

[0156] Reference Figure 5D , the process may include disposing a first adhesive material layer 121 , a second adhesive material layer 122 , and a third adhesive material layer 123 on the display panel 10 .

[0157] The process may include semi-curing the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 so that each maintains a certain shape. The process may include arranging and semi-curing the first adhesive material layer 121 and the third adhesive material layer 123 so that the first adhesive material layer 121 and the third adhesive material layer 123 correspond to the peripheral area PA and have a frame shape around the central area CA. The process may include arranging the second adhesive material layer 122 corresponding to the central area CA so that the second adhesive material layer 122 covers the central area CA. The second adhesive material layer 122 and the third adhesive material layer 123 may be separated from each other, and a portion of the first adhesive material layer 121 may be exposed in an area where the second adhesive material layer 122 and the third adhesive material layer 123 are separated from each other.

[0158] Figure 5E is along Figure 5D The line Ve-Ve' intercepts Figure 5D A cross-sectional view of a display device.

[0159] Reference Figure 5E , the process may include disposing and semi-curing the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 on the display panel 10 while maintaining a certain shape of each of the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123. The first adhesive material layer 121 may have a peak width 121-Wmax at a lower surface contacting the display panel 10.

[0160] The properties of the first adhesive material layer 121 can be compared with those of Figure 5B Same as described.

[0161] The process may include disposing a second adhesive material layer 122 on the display panel 10 corresponding to the central area CA.

[0162] A portion of the second adhesive layer 122 may extend to the peripheral area PA. In an embodiment, an edge of the second adhesive layer 122 may contact the first edge 121 - E1 of the first adhesive layer 121 , and another edge of the second adhesive layer 122 may be disposed on the first portion A1 of the first adhesive layer 121 .

[0163] The second adhesive material layer 122 may overlap the first portion A1 of the first adhesive material layer 121 in the peripheral area PA. For example, the second adhesive material layer 122 may cover a portion of the first portion A1 of the first adhesive material layer 121.

[0164] The second adhesive material layer 122 may directly contact the first portion A1 of the first adhesive material layer 121. For example, the second adhesive material layer 122 may cover a portion of the first portion A1 while directly contacting an upper surface of the first portion A1 of the first adhesive material layer 121.

[0165] The thickness 121-T of the first adhesive material layer 121 (or the first portion A1) covered by the second adhesive material layer 122 may be less than the peak thickness 121-Tmax of the first adhesive material layer 121. Therefore, the first adhesive material layer 121 may serve as a bank to prevent the second adhesive material layer 122 from overflowing beyond the peripheral area PA to the edge of the display panel 10.

[0166] The process may include disposing a third adhesive material layer 123 on the display panel 10 in the peripheral area PA. For example, the third adhesive material layer 123 may be disposed on the first adhesive material layer 121 in the peripheral area PA.

[0167] The third adhesive material layer 123 may overlap a portion of the upper surface of the first adhesive material layer 121. In an embodiment, an edge of the third adhesive material layer 123 may contact the second edge 121-E2 of the first adhesive material layer 121 (or an edge of the display panel 10), and another edge of the third adhesive material layer 123 may contact the peak 121-P of the first adhesive material layer 121. In some embodiments, another edge of the third adhesive material layer 123 may be disposed on the second portion A2 of the first adhesive material layer 121.

[0168] The third adhesive material layer 123 may overlap the second portion A2 of the first adhesive material layer 121 in the peripheral area PA. For example, the third adhesive material layer 123 may cover a portion of the second portion A2 of the first adhesive material layer 121. In an embodiment, a width 123-W of the third adhesive material layer 123 measured from an edge of the third adhesive material layer 123 to another edge of the third adhesive material layer 123 in a direction parallel to the upper surface of the display panel 10 (e.g., ±x direction) may be equal to or less than a width A2-W of the second portion A2.

[0169] The third adhesive material layer 123 may directly contact the second portion A2 of the first adhesive material layer 121. For example, the third adhesive material layer 123 may directly contact the upper surface of the second portion A2 of the first adhesive material layer 121 and cover at least a portion of the second portion A2.

[0170] The second adhesive material layer 122 and the third adhesive material layer 123 may be separated from each other. A portion of the first adhesive material layer 121 may be exposed in a region where the second adhesive material layer 122 and the third adhesive material layer 123 are separated from each other. Figure 5EIn the example of the present invention, the width 123-W of the third adhesive material layer 123 is the same as the width A2-W of the second portion A2, and the portion of the first adhesive material layer 121 where the second adhesive material layer 122 is separated from the third adhesive material layer 123 is arranged only in the first portion A1 of the first adhesive material layer 121, but the embodiment is not limited thereto. In some embodiments, the width 123-W of the third adhesive material layer 123 may be smaller than the width A2-W of the second portion A2, and the region where the second adhesive material layer 122 is separated from the third adhesive material layer 123 may be arranged in both the first portion A1 and the second portion A2 of the first adhesive material layer 121.

[0171] Reference Fig. 5F , the process may include reference to Figure 5E The window 30 is disposed on the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 described in the embodiment shown in FIG. The first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 may be used as an adhesive to attach the display panel 10 to the window 30.

[0172] First, the process may include moving the window 30 from the +z direction to the -z direction relative to the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123. In this case, the upper surface of the display panel 10 and the lower surface of the window 30 may be parallel to each other. For example, the process may include arranging the display panel 10 and the window 30 so that the upper surface of the display panel 10 and the lower surface of the window 30 are parallel to the +x direction and the -x direction.

[0173] After moving the window 30 in the -z direction so that the window 30 contacts the upper surface of the third adhesive material layer 123, the process may include applying pressure in the -z direction (e.g., continuously applying pressure). Since the third adhesive material layer 123 is semi-cured, which is a state that is not completely cured, the pressure applied in the -z direction may deform the third adhesive material layer 123. In this case, the third adhesive material layer 123 pressed by the window 30 may be deformed and may fill the space SP between the third adhesive material layer 123 and the edge of the display panel 10.

[0174] In an example, the process may include then continuing to apply pressure in the -z direction, and accordingly, the lower surface of the window 30 may contact the upper surface of the second adhesive material layer 122. The process may include continuing to apply pressure. Since the second adhesive material layer 122 is semi-cured, and semi-curing is a state that is not completely cured, the continuous pressure applied in the -z direction may deform the second adhesive material layer 122. Therefore, the second adhesive material layer 122 may be deformed to fill the space SP between the first adhesive material layer 121 and the second adhesive material layer 122.

[0175] By applying pressure in the -z direction, the process can adjust the second adhesive material layer 122 and the third adhesive material layer 123 so that the second adhesive material layer 122 and the third adhesive material layer 123 fill the entire space SP, thereby completely curing the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123. The process of completely curing the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 may include emitting light (e.g., ultraviolet light) for a certain period of time. Therefore, the process can completely cure the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123, and (e.g., due to curing) the display panel 10 is attached to the window 30.

[0176] Through the above process, it is possible to manufacture Figure 3A and Figure 3B In this case, the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 that are completely cured may correspond to ( Figure 3B ) a first adhesive layer 21, a second adhesive layer 22 and a third adhesive layer 23.

[0177] In some embodiments, the process may include additionally applying pressure in the -z direction before fully curing the first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123. In this case, for example, the pressure in the z direction may further adjust one or more characteristics of the first adhesive material layer 121. For example, the pressure in the -z direction may reduce the thickness of the first adhesive material layer 121 (or the length in the ±z direction) and increase the width of the first adhesive material layer 121 (or the length in the ±x direction). In some cases, the pressure in the -z direction may cause a portion of the upper surface of the first adhesive material layer 121 to directly contact the window 30. Through the above process, a window 30 according to the present invention can be manufactured. Figure 4A and Figure 4B In this case, the adjusted and completely cured first adhesive material layer 121, the second adhesive material layer 122, and the third adhesive material layer 123 may correspond to ( Figure 4B ) a first adhesive layer 21, a second adhesive layer 22 and a third adhesive layer 23.

[0178] Fig. 6A is a schematic plan view of a display device 1 according to an embodiment.

[0179] Reference Fig. 6A, the adhesive layer 20 may include a first adhesive layer 21, a second adhesive layer 22, a third adhesive layer 23, and a fourth adhesive layer 24. In an embodiment, the first adhesive layer 21, the second adhesive layer 22, the third adhesive layer 23, and the fourth adhesive layer 24 may include the same material. Fig. 6A The described embodiments may include aspects of other embodiments described herein, and repeated descriptions of similar elements are omitted for the sake of brevity.

[0180] The fourth adhesive layer 24 may overlap each of a portion of the first adhesive layer 21 and a portion of the second adhesive layer 22. The fourth adhesive layer 24 may overlap each of a portion of the central area CA and a portion of the peripheral area PA. The fourth adhesive layer 24 may have an approximately frame shape surrounding the central area CA.

[0181] Figure 6B According to some embodiments, Fig. 6A Schematic cross-sectional view of a portion of the display device 1 taken along line VI-VI′.

[0182] Reference Figure 6B The adhesive layer 20 may include a first adhesive layer 21 , a second adhesive layer 22 , a third adhesive layer 23 and a fourth adhesive layer 24 .

[0183] Characteristics of the first adhesive layer 21 and the third adhesive layer 23 and reference Figure 3B Same as described.

[0184] The second adhesive layer 22 may be disposed corresponding to the central area CA. In an embodiment, the second adhesive layer 22 may be disposed in the central area CA. The first adhesive layer 21 and the second adhesive layer 22 may be separated from each other.

[0185] The fourth adhesive layer 24 may be disposed between the first adhesive layer 21 and the second adhesive layer 22. For example, the fourth adhesive layer 24 may be disposed between the display panel 10 and the window 30, and fill a space where the first adhesive layer 21 and the second adhesive layer 22 are separated from each other.

[0186] Thus, the width of the fourth adhesive layer 24 may be variable (eg, may not be constant). In an embodiment, the width of the fourth adhesive layer 24 may be largest in the upper surface of the fourth adhesive layer 24 directly contacting the window 30 and may decrease along the -z direction.

[0187] The fourth adhesive layer 24 may overlap the central area CA and the peripheral area PA. In an embodiment, a portion of the fourth adhesive layer 24 may overlap the first adhesive layer 21 in the peripheral area PA. A portion of the fourth adhesive layer 24 may overlap the second adhesive layer 22 in the central area CA.

[0188] The fourth adhesive layer 24 may directly contact the first adhesive layer 21, the second adhesive layer 22, and the display panel 10. In an embodiment, a portion of the fourth adhesive layer 24 may directly contact the first adhesive layer 21 and cover a portion of the first adhesive layer 21 in the peripheral area PA. A portion of the fourth adhesive layer 24 may directly contact the second adhesive layer 22 in the central area CA and cover a portion of the second adhesive layer 22. The fourth adhesive layer 24 may directly contact the display panel 10 in an area where the first adhesive layer 21 and the second adhesive layer 22 are separated from each other in the central area CA.

[0189] The third adhesive layer 23 and the fourth adhesive layer 24 may cover the entire upper surface of the first adhesive layer 21. For example, the third adhesive layer 23 covers the upper surface of the second portion A2 of the first adhesive layer 21, the fourth adhesive layer 24 covers the upper surface of the first portion A1 of the first adhesive layer 21, and the third adhesive layer 23 and the fourth adhesive layer 24 may contact each other in the peak 21-P. The embodiments of the present disclosure are not limited thereto, and in some embodiments, the third adhesive layer 23 and the fourth adhesive layer 24 may cover portions of the first portion A1 and the second portion A2 of the first adhesive layer 21, respectively.

[0190] Fig. 7A , Figure 7C and Fig.7D Each is a plan view of a display device in a processing state of a method of manufacturing a display device according to some embodiments.

[0191] Figure 7B , Fig. 7E and Figure 7F Each is a cross-sectional view of a display device in a processing state of a method of manufacturing a display device according to some embodiments.The terms method and process may be used interchangeably herein.

[0192] Fig. 7A and Figure 7B Each is a plan view and a cross-sectional view of a display device according to a process of forming the first adhesive material layer 221 and the second adhesive material layer 222 . Figure 7C , Fig.7D and Fig. 7E Each is a plan view or a cross-sectional view of a display device according to a process of forming the third adhesive material layer 223 and the fourth adhesive material layer 224 . Figure 7F is a cross-sectional view of a display device according to a process of pressing the window 30. Hereinafter, in an example, the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224 may include the same material.

[0193] In the following, references to FIG. 5A to FIG. 5F The embodiments described have both distinctive and redundant characteristics, and the following description will primarily concern the differences.

[0194] Reference Fig. 7A , the process may include forming a first adhesive material layer 221 and a second adhesive material layer 222 on the display panel 10 .

[0195] The process of forming the first adhesive material layer 221 and the second adhesive material layer 222 may include applying the adhesive material through the first injection device 2 - 1 and semi-curing through the first curing device 3 - 1 .

[0196] First, the process may include applying an adhesive material (eg, OCR) included in the first adhesive material layer 221 and the second adhesive material layer 222 to the display panel 10 by using the first injection device 2 - 1 .

[0197] The process may include controlling the first injection device 2-1 so that the adhesive material is injected from a predetermined head H (e.g., not injected from other heads H), thereby applying the first adhesive material layer 221 to the peripheral area PA of the display panel 10 accordingly, and applying the second adhesive material layer 222 to the central area CA of the display panel 10 accordingly. For example, the process may include controlling some of the plurality of heads H overlapping the peripheral area PA of the first injection device 2-1 (e.g., not all of the plurality of heads H) to inject the adhesive material so that the first adhesive material layer 221 is applied to the peripheral area PA. Simultaneously, for example, the process may include controlling some of the plurality of heads H overlapping the central area CA of the first injection device 2-1 (e.g., not all of the plurality of heads H) to inject the adhesive material so that the second adhesive material layer 222 is applied to the central area CA. In this case, the first adhesive material layer 221 and the second adhesive material layer 222 may be separated from each other.

[0198] The process may include moving the first injection device 2 - 1 in a direction (eg, +y direction) at a certain speed (eg, a first speed v1 ) and injecting the adhesive material so that the first adhesive material layer 221 and the second adhesive material layer 222 are completely and evenly applied.

[0199] Subsequently, the process may include semi-curing the adhesive material. For example, the process may include semi-curing the first adhesive material layer 221 and the second adhesive material layer 222 after applying the first adhesive material layer 221 and the second adhesive material layer 222 by injecting the adhesive material using the first injection device 2-1 (for example, immediately after applying the first adhesive material layer 221 and the second adhesive material layer 222 by injecting the adhesive material using the first injection device 2-1).

[0200] The process may include controlling the first curing device 3-1 and the first injection device 2-1 so that the first curing device 3-1 is separated from the first injection device 2-1 by a certain distance (e.g., a first distance D1), and the first curing device 3-1 follows the first injection device 2-1 at a constant speed (e.g., a first speed v1). The first adhesive material layer 221 and the second adhesive material layer 222 semi-cured by irradiating the first adhesive material layer 221 and the second adhesive material layer 222 with light using the first curing device 3-1 may have a certain elastic modulus and may maintain a certain shape. In an example, based on the semi-curing, the first adhesive material layer 221 and the second adhesive material layer 222 may maintain the shape until a subsequent process.

[0201] Figure 7B is along Fig. 7A A cross-sectional view of the display device taken along line VIIb-VIIb'.

[0202] Reference Figure 7B , the process may include disposing and semi-curing the first adhesive material layer 221 and the second adhesive material layer 222 on the display panel 10 so that the first adhesive material layer 221 and the second adhesive material layer 222 maintain a certain shape. The process may include arranging the first adhesive material layer 221 corresponding to the peripheral area PA. The process may include arranging the second adhesive material layer 222 corresponding to the central area CA.

[0203] The thickness of the first adhesive material layer 221 may be variable (e.g., may not be constant). For example, the thickness of the first adhesive material layer 221 may change along the ±x direction. The portion where the thickness of the first adhesive material layer 221 is the largest may be defined as the peak 221-P of the first adhesive material layer 221. Among the edges of the first adhesive material layer 221, the edge adjacent to the central area CA may be defined as the first edge 221-E1. The edge positioned on the opposite side of the first edge 221-E1 among the edges of the first adhesive material layer 221 may be defined as the second edge 221-E2. In this case, the portion of the first adhesive material layer 221 arranged between the peak 221-P and the first edge 221-E1 may be referred to as the first portion A1, and the portion of the first adhesive material layer 221 arranged between the peak 221-P and the second edge 221-E2 may be referred to as the second portion A2. In an implementation, the cross-sectional shape of the first adhesive material layer 221 may be substantially semicircular, and the width A1 -W of the first portion A1 may be substantially equal to the width A2 -W of the second portion A2 .

[0204] Reference Figure 7C , the process may include reference to Fig. 7A The third adhesive material layer 223 and the fourth adhesive material layer 224 are formed on the display panel 10 described in the embodiment shown in FIG.

[0205] The process of forming the third adhesive material layer 223 and the fourth adhesive material layer 224 may include applying the adhesive material through the second injection device 2 - 2 and semi-curing through the second curing device 3 - 2 .

[0206] First, the process may include applying the adhesive material included in the third adhesive material layer 223 and the fourth adhesive material layer 224 to the Fig. 7A . In an embodiment, the adhesive material included in the third adhesive material layer 223 and the fourth adhesive material layer 224 may be the same adhesive material (e.g., OCR) as the material included in the first adhesive material layer 221 and the second adhesive material layer 222. In an embodiment, the process may include applying the third adhesive material layer 223 and applying the fourth adhesive material layer 224 simultaneously.

[0207] Similar to the process of applying the first adhesive material layer 221 and the second adhesive material layer 222, the process may include applying the third adhesive material layer 223 and the fourth adhesive material layer 224 according to a desired shape by controlling the head H of the second injection device 2-2. For example, the process may include controlling the second injection device 2-2 so that the head H of the second injection device 2-2 injects adhesive material to apply the third adhesive material layer 223 overlappingly on the first adhesive material layer 221, and so that the head H injects adhesive material to apply the fourth adhesive material layer 224 overlappingly on the first adhesive material layer 221 and the second adhesive material layer 222. In this case, the process may include controlling the second injection device 2-2 so that the adhesive substance is prevented from being injected by a certain part of the plurality of heads H (for example, the adhesive substance is not injected from a certain part of the plurality of heads H), thereby separating the third adhesive material layer 223 and the fourth adhesive material layer 224 from each other.

[0208] The process may include moving the second injection device 2-2 at a certain speed (e.g., second speed v2) along a direction (e.g., +y direction), and injecting the adhesive material using the second injection device 2-2 so that the third adhesive material layer 223 and the fourth adhesive material layer 224 are completely and evenly applied. In some embodiments, the second speed v2 may be equal to the first speed v1 ( Fig. 7A ). In some other embodiments, the second speed v2 may be different from the first speed v1.

[0209] Subsequently, for example, the process may include semi-curing the adhesive material. For example, the process may include semi-curing the third adhesive material layer 223 and the fourth adhesive material layer 224 after applying the third adhesive material layer 223 and the fourth adhesive material layer 224 by injecting the adhesive material using the second injection device 2-2 (for example, immediately after applying the third adhesive material layer 223 and the fourth adhesive material layer 224 by injecting the adhesive material using the second injection device 2-2, after one or more intermediate operations).

[0210] The process may include using the second curing device 3-2 to emit light of a predetermined wavelength band, while controlling the second curing device 3-2 and the second injection device 2-2. For example, the process may include moving the second curing device 3-2 and the second injection device 2-2 so that the second curing device 3-2 is separated from the second injection device 2-2 by a certain distance (e.g., a second distance D2), and the second curing device 3-2 follows the second injection device 2-2 at a constant speed (e.g., a second speed v2). In some embodiments, the second distance D2 may be different from the first distance D1 ( Fig. 7A ). For example, the second distance D2 may be smaller than the first distance D1 ( Fig. 7A ). The third adhesive material layer 223 and the fourth adhesive material layer 224 semi-cured by irradiating the third adhesive material layer 223 and the fourth adhesive material layer 224 with light using the second curing device 3-2 may have a certain elastic modulus and may maintain a certain shape. In an example, based on the semi-curing, the third adhesive material layer 223 and the fourth adhesive material layer 224 may maintain the shape until the subsequent process.

[0211] In the process of emitting light by using the second curing device 3-2, the process may include exposing the third adhesive material layer 223 and the fourth adhesive material layer 224 to the light irradiated by the second curing device 3-2, and further, exposing the first adhesive material layer 221 and the second adhesive material layer 222 to the light irradiated by the second curing device 3-2. Therefore, the first adhesive material layer 221 and the second adhesive material layer 222 may show an effect of being semi-cured twice. In an example, the elastic modulus of the first adhesive material layer 221 and the second adhesive material layer 222 may be different from the elastic modulus of the third adhesive material layer 223 and the fourth adhesive material layer 224.

[0212] Reference Fig.7D , the process may include disposing a first adhesive material layer 221 , a second adhesive material layer 222 , a third adhesive material layer 223 , and a fourth adhesive material layer 224 on the display panel 10 .

[0213] The process may include semi-curing the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224 so that each maintains a certain shape. The process may include arranging and semi-curing the first adhesive material layer 221 and the third adhesive material layer 223 so that the first adhesive material layer 221 and the third adhesive material layer 223 correspond to the peripheral area PA and have a frame shape around the central area CA. The process may include arranging the second adhesive material layer 222 corresponding to the central area CA so that the second adhesive material layer 222 covers a portion of the central area CA. The process may include arranging the fourth adhesive material layer 224 corresponding to the first adhesive material layer 221 and the second adhesive material layer 222, and the fourth adhesive material layer 224 may have an approximate frame shape around the second adhesive material layer 222.

[0214] The first adhesive material layer 221 and the second adhesive material layer 222 may be separated from each other. The second adhesive material layer 222 and the third adhesive material layer 223 may be separated from each other. The third adhesive material layer 223 and the fourth adhesive material layer 224 may be separated from each other, and a portion of the first adhesive material layer 221 may be exposed in a region where the third adhesive material layer 223 and the fourth adhesive material layer 224 are separated from each other.

[0215] Fig. 7E is along Fig.7D The line VIIe-VIIe' is intercepted by Fig.7D A cross-sectional view of a display device. Fig. 7E The process may include disposing and semi-curing a first adhesive material layer 221, a second adhesive material layer 222, a third adhesive material layer 223, and a fourth adhesive material layer 224 on the display panel 10 while maintaining a certain shape of each of the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224.

[0216] The properties of the first adhesive material layer 221 can be compared with those of Figure 7B Same as described.

[0217] The process may include disposing a second adhesive material layer 222 on the display panel 10 corresponding to the central area CA. The first adhesive material layer 221 and the second adhesive material layer 222 may be separated from each other.

[0218] The process may include disposing the third adhesive material layer 223 on the display panel 10 in the peripheral area PA. For example, the process may include disposing the third adhesive material layer 223 on the first adhesive material layer 221 in the peripheral area PA.

[0219] The third adhesive material layer 223 may overlap a portion of the upper surface of the first adhesive material layer 221. In an embodiment, an edge of the third adhesive material layer 223 may contact the second edge 221-E2 of the first adhesive material layer 221 (or an edge of the display panel 10), and another edge of the third adhesive material layer 223 may contact the peak 221-P of the first adhesive material layer 221. In some embodiments, another edge of the third adhesive material layer 223 may be disposed on the second portion A2 of the first adhesive material layer 221.

[0220] The third adhesive material layer 223 may overlap the second portion A2 of the first adhesive material layer 221 in the peripheral area PA. For example, the third adhesive material layer 223 may cover a portion of the second portion A2 of the first adhesive material layer 221. In an embodiment, a width 223-W of the third adhesive material layer 223 measured from an edge of the third adhesive material layer 223 to another edge of the third adhesive material layer 223 in a direction parallel to the upper surface of the display panel 10 (e.g., ±x direction) may be equal to or less than a width A2-W of the second portion A2.

[0221] The third adhesive material layer 223 may directly contact the second portion A2 of the first adhesive material layer 221. For example, the third adhesive material layer 223 may directly contact the upper surface of the second portion A2 of the first adhesive material layer 221 and cover at least a portion of the second portion A2.

[0222] The fourth adhesive material layer 224 may be disposed between the first adhesive material layer 221 and the second adhesive material layer 222. For example, the fourth adhesive material layer 224 may fill a portion of a space between the first adhesive material layer 221 and the second adhesive material layer 222.

[0223] The fourth adhesive material layer 224 may overlap the central area CA and the peripheral area PA. In an embodiment, a portion of the fourth adhesive material layer 224 may overlap the first adhesive material layer 221 in the peripheral area PA. A portion of the fourth adhesive material layer 224 may overlap the second adhesive material layer 222 in the central area CA.

[0224] The fourth adhesive material layer 224 may directly contact the first adhesive material layer 221, the second adhesive material layer 222, and the display panel 10. In an embodiment, a portion of the fourth adhesive material layer 224 may directly contact the first adhesive material layer 221 and cover a portion of the first adhesive material layer 221 in the peripheral area PA. A portion of the fourth adhesive material layer 224 may directly contact the second adhesive material layer 222 and cover a portion of the second adhesive material layer 222 in the central area CA. The fourth adhesive material layer 224 may directly contact the display panel 10 in an area where the first adhesive material layer 221 and the second adhesive material layer 222 are separated from each other in the central area CA.

[0225] The thickness 221-T of the first adhesive material layer 221 (or the first portion A1) covered by the fourth adhesive material layer 224 may be less than the peak thickness 221-Tmax of the first adhesive material layer 221. Therefore, the first adhesive material layer 221 may serve as a bank to prevent the fourth adhesive material layer 224 from overflowing beyond the peripheral area PA to the edge of the display panel 10.

[0226] The third adhesive material layer 223 and the fourth adhesive material layer 224 may be separated from each other. A portion of the first adhesive material layer 221 may be exposed in a region where the third adhesive material layer 223 and the fourth adhesive material layer 224 are separated from each other. Fig. 7E In the example of the present invention, the width 223-W of the third adhesive material layer 223 is the same as the width A2-W of the second portion A2, and the portion of the first adhesive material layer 221 where the third adhesive material layer 223 is separated from the fourth adhesive material layer 224 is arranged only in the first portion A1 of the first adhesive material layer 221, but the embodiment is not limited thereto. In some embodiments, the width 223-W of the third adhesive material layer 223 may be smaller than the width A2-W of the second portion A2, and the region where the third adhesive material layer 223 is separated from the fourth adhesive material layer 224 may be arranged in both the first portion A1 and the second portion A2 of the first adhesive material layer 221.

[0227] Reference Figure 7F , the process may include Fig. 7E The window 30 is provided on the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223 and the fourth adhesive material layer 224 of the embodiment shown in FIG. The first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223 and the fourth adhesive material layer 224 may be used as an adhesive for attaching the display panel 10 to the window 30.

[0228] First, the process may include moving the window 30 from the +z direction to the -z direction relative to the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224. In this case, the upper surface of the display panel 10 and the lower surface of the window 30 may be parallel to each other. For example, the process may include arranging the display panel 10 and the window 30 so that the upper surface of the display panel 10 and the lower surface of the window 30 are parallel to the +x direction and the -x direction.

[0229] After moving the window 30 in the -z direction so that the window 30 contacts the upper surface of the third adhesive material layer 223, the process may include applying pressure in the -z direction (e.g., continuously applying pressure). Since the third adhesive material layer 223 is semi-cured, which is a state that is not completely cured, the pressure applied in the -z direction may deform the third adhesive material layer 223. In this case, the third adhesive material layer 223 pressed by the window 30 may be deformed and may fill the space SP between the third adhesive material layer 223 and the edge of the display panel 10.

[0230] In an example, the process may include then continuing to apply pressure in the -z direction, and accordingly, the lower surface of the window 30 may contact the upper surface of the fourth adhesive material layer 224. The process may include continuing to apply pressure. Since the fourth adhesive material layer 224 is semi-cured, and semi-curing is a state that is not completely cured, the continuous pressure applied in the -z direction may deform the fourth adhesive material layer 224. Therefore, the fourth adhesive material layer 224 may be deformed to fill the space SP between the first adhesive material layer 221 and the fourth adhesive material layer 224 and the space SP between the second adhesive material layer 222 and the fourth adhesive material layer 224.

[0231] In an example, the process may include then continuing to apply pressure in the -z direction, and accordingly, the lower surface of the window 30 may contact the upper surface of the second adhesive material layer 222. The process may include continuing to apply pressure. Since the second adhesive material layer 222 is semi-cured, and semi-curing is a state that is not completely cured, the continuous pressure applied in the -z direction may deform the second adhesive material layer 222. Therefore, the second adhesive material layer 222 may be deformed to fill the space SP between the second adhesive material layer 222 and the fourth adhesive material layer 224.

[0232] By applying pressure in the -z direction, the process can adjust the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224 so that the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224 fill the entire space SP, thereby completely curing the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224. The process of completely curing the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224 may include emitting light (e.g., ultraviolet light) for a certain period of time. Therefore, the process can completely cure the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224, and (e.g., due to curing) the display panel 10 is attached to the window 30.

[0233] Through the above process, it is possible to manufacture Fig. 6A and Figure 6B In this case, the first adhesive material layer 221, the second adhesive material layer 222, the third adhesive material layer 223, and the fourth adhesive material layer 224 that are completely cured may correspond to ( Figure 6B ) a first adhesive layer 21, a second adhesive layer 22, a third adhesive layer 23 and a fourth adhesive layer 24.

[0234] Fig. 8A and Figure 8B Each is a plan view and a cross-sectional view of an enlarged central area CA in a processing state of a method of manufacturing a display device according to an embodiment.

[0235] Reference Fig. 8A and Figure 8B , some of the multiple heads H of the second injection device 2-2 may overlap with each other in the central area CA. Therefore, the adhesive material may be additionally injected in the area where the heads H overlap with each other. In order to compensate for the additional injection, the adhesive material may be controlled to be injected less in the area adjacent to the area where the heads H overlap with each other. For example, for the area where the multiple heads H overlap with each other, the method may include controlling the heads H so that the amount of adhesive material injected by one or more heads H in the area is reduced. Alternatively, for example, the method may include controlling the heads H so that the amount of adhesive material injected by one or more heads H adjacent to the area is reduced.

[0236] Therefore, for example, the second adhesive material layer 122 may include a plurality of curved portions C extending in the moving direction (e.g., +y direction) of the second injection device 2-2. For example, the second adhesive material layer 122 may include a first curved portion C1, a second curved portion C2, a third curved portion C3, and a fourth curved portion C4 extending in the +y direction and parallel to each other.

[0237] The first curved portion C1, the second curved portion C2, the third curved portion C3, and the fourth curved portion C4 may include a convex portion that protrudes more than the upper surface of the second adhesive material layer 122 parallel to the upper surface of the display panel 10 (for example, in the +z direction) in the area where the head portions H overlap with each other, and may include a concave portion adjacent to the convex portion.

[0238] When the window 30 is pressed on the second adhesive material layer 122, if the elastic modulus of the second adhesive material layer 122 is low enough, the first curved portion C1, the second curved portion C2, the third curved portion C3, and the fourth curved portion C4 may be deformed by pressure and become flat. If the elastic modulus of the second adhesive material layer 122 is not low enough, at least some of the first curved portion C1, the second curved portion C2, the third curved portion C3, and the fourth curved portion C4 may not become completely flat, and protrusions and depressions may remain.

[0239] In this case, the portions of the first curved portion C1, the second curved portion C2, the third curved portion C3, and the fourth curved portion C4 where the protrusions and depressions may remain may remain as streaky stains in the central area CA, which may be recognized by a user when an image is displayed through the light emitting diode. This may cause image quality of the display device to deteriorate.

[0240] Fig. 9 is a graph showing elastic modulus according to semi-curing rate according to one or more embodiments of the present disclosure.

[0241] Fig.10 is a graph showing visibility of streak stains (also referred to as horizontal line stains) according to a semi-curing rate according to one or more embodiments of the present disclosure.

[0242] Reference Fig. 9 , ultraviolet irradiation is performed once in the first embodiment H1, and ultraviolet irradiation is performed twice in the second embodiment H2.

[0243] Referring to the graph, the x-axis indicates the semi-curing rate, and the y-axis indicates the elastic modulus whose unit is Pascal (Pa).

[0244] It can be confirmed from the first embodiment H1 and the second embodiment H2 that the elastic modulus increases as the semi-curing rate increases. It can be confirmed that the elastic modulus increases as the semi-curing rate increases regardless of the number of times of ultraviolet irradiation.

[0245] As a result of comparing the first embodiment H1 with the second embodiment H2, it is shown that the second embodiment H2, which performs two ultraviolet irradiations, has a larger semi-curing rate and elastic modulus. For example, the semi-curing rate of the first embodiment H1 may be about 37% to about 62%. The semi-curing rate of the second embodiment H2 may be about 42% to about 67.5%.

[0246] If the semi-curing rate increases, the elastic modulus of the adhesive material layer may increase. Since the higher elastic modulus of the adhesive material makes it more difficult to flatten the bend during the window pressing process, the visibility of the streak stain will increase. As a result, the visibility of the streak stain may increase as the semi-curing rate increases. Fig.10 A graph showing the relationship between the semi-curing rate and the visibility of streak stains is shown in FIG.

[0247] Reference Fig.10 , the x-axis represents the semi-curing rate, and the y-axis represents visibility whose unit is an arbitrary unit.

[0248] The level of visibility may be determined as a threshold visibility VL. In an embodiment, the threshold visibility VL may be set to 1.6. The semi-curing rate corresponding to the threshold visibility VL may be defined as a threshold semi-curing rate HL. In an embodiment, the threshold semi-curing rate HL corresponding to the threshold visibility VL may be about 59%.

[0249] Reference Fig. 9 , refer to Fig.10 The determined threshold semi-curing rate HL is shown as a dotted line parallel to the y-axis.

[0250] In the case of the first embodiment H1, it is shown that about 88% of the semi-curing rates (about 37% to about 59%) of the entire semi-curing rate range (about 37% to about 62%) are less than or equal to the threshold semi-curing rate HL.

[0251] In the case of the second embodiment H2, it is shown that about 67% of the semi-curing rates (about 42% to about 59%) of the entire semi-curing rate range (about 42% to about 67.5%) are less than or equal to the threshold semi-curing rate HL.

[0252] Therefore, a lower number of ultraviolet irradiations results in a greater number of embodiments corresponding to the threshold semi-curing rate HL or lower, and therefore, more embodiments having streak stains as much as or less than the threshold visibility VL can be obtained.

[0253] from Fig. 8A , Figure 8B , Fig. 9 and Fig.10 It was shown that reducing the number of UV exposures was effective in reducing the visibility of streak stains in the central area of ​​the displayed image. FIG. 5A to FIG. 5F In the embodiment shown in FIG. 1 , the second adhesive material layer 122 ( Figure 5C ) once. Therefore, by FIG. 5A to FIG. 5F The method of manufacturing a display device according to the embodiment shown in can prepare a display device having improved image quality due to reduced visibility of streak stains.

[0254] Fig.11 is a graph showing an application profile of an adhesive material layer according to the prior art and an application profile of an adhesive material layer according to an embodiment of the present disclosure.

[0255] Fig.11 The graph shown in shows the application profile of the adhesive material layer, and for the convenience of comparison with the previous embodiment, the following description is provided under the assumption that the distance corresponds to the x-axis and the unit is millimeter (mm) and the height corresponds to the z-axis and the unit is also mm.

[0256] Reference Fig.11 , the application profile of the adhesive material layer according to the prior art (i.e., the first profile 120-Ref) is a comparative example relative to the present disclosure and is represented by relatively thick solid lines and dashed lines. The application profile of the adhesive material layer according to the embodiment supported by various aspects of the present disclosure (i.e., the second profile 120') is represented by relatively thin straight lines and dashed lines.

[0257] For example, the second profile 120' may represent Figure 5E The embodiment shown in .

[0258] The z value of the upper surface of the display panel is 0, and may be a straight line parallel to the x-axis.

[0259] The edge of the display panel has an x ​​value of 0 and may be a straight line parallel to the z-axis.

[0260] The first outline 120 -Ref may include a second portion 122 -Ref indicated by solid and dotted lines and overlapping the entire central area CA and the peripheral area PA, and a third portion 123 -Ref disposed on the second portion 122 -Ref and indicated by a solid line.

[0261] The second profile 120' may include a first portion 121' represented by a solid line and a dotted line and corresponding to the peripheral area PA, a second portion 122' represented by a solid line and corresponding to the central area CA, and a third portion 123' represented by a solid line and disposed on the first portion 121'. The first portion 121', the second portion 122', and the third portion 123' may correspond to ( Figure 5E ) a first adhesive material layer 121, a second adhesive material layer 122 and a third adhesive material layer 123.

[0262] The second portion 122-Ref of the first outline 120-Ref may overlap the entire central area CA and the peripheral area PA and may extend to the edge of the display panel or to a point where x=0 and z=0. A portion of the second portion 122-Ref may be covered by the third portion 123-Ref. The portion of the second portion 122-Ref covered by the third portion 123-Ref is indicated by a dotted line.

[0263] The third portion 123-Ref of the first profile 120-Ref may overlap with a portion of the central area CA and the peripheral area PA, and be disposed on the second portion 122-Ref. The peak 123-PRef of the third portion 123-Ref may be disposed at an approximate point of x=0.6 mm and z=80.5 mm. An edge of the third portion 123-Ref may be disposed at an edge of the display panel or an approximate point of x=0 and z=35 mm, and another edge of the third portion 123-Ref may be disposed at an approximate point of x=1.0 mm and on the second portion 122-Ref. Therefore, the width 123-WRef of the third portion 123-Ref along the x-axis direction may be approximately 1.0 mm.

[0264] The first portion 121' of the second profile 120' overlaps the peripheral area PA and may be arranged from the edge of the display panel to the boundary between the peripheral area PA and the central area CA. For example, the first portion 121' may be arranged between the edge of the display panel or a point where x=0 and z=25 mm and the boundary between the peripheral area PA and the central area CA or a point where x=0.9 mm and z=0. The width of the first portion 121' according to the x-axis direction may be substantially equal to the width of the peripheral area PA. For example, the width of the first portion 121' may be about 0.9 mm.

[0265] The second portion 122' of the second profile 120' may overlap the entire central area CA, and a portion of the second portion 122' may extend to the peripheral area PA to cover a portion of the first portion 121'. The portion of the first portion 121' covered by the second portion 122' is indicated by a dotted line.

[0266] The third portion 123' of the second profile 120' may be disposed on the first portion 121' in the peripheral area PA. A portion of the first portion 121' covered by the third portion 123' is indicated by a dotted line.

[0267] The edge of the third portion 123' of the second profile 120' may be arranged in the edge of the display panel, or approximately at x=0 and z=25 mm. The other edge of the third portion 123' may be arranged at the peak of the first portion 121' or at an approximate point of x=0.5 mm and z=68 mm. Therefore, the width 123'-W of the third portion 123' along the x-axis direction may be about 0.5 mm. The peak 123'-P of the third portion 123' may be arranged at an approximate point of x=0.4 mm and z=86 mm.

[0268] The width 123-WRef of the third portion 123-Ref of the first profile 120-Ref may be about 1.0 mm and may be greater than the width of the peripheral area PA which is 0.9 mm. Therefore, part of the third portion 123-Ref of the first profile 120-Ref may be arranged in the central area CA.

[0269] The width 123'-W of the third portion 123' of the second profile 120' may be about 0.5 mm and may be smaller than the width of the peripheral area PA which is 0.9 mm. Therefore, the third portion 123' of the second profile 120' may not include a portion disposed in the central area CA.

[0270] Fig.12 is a plan view of a display device 1 manufactured by applying a layer of adhesive material according to the prior art. For example, Fig.12 The embodiment shown in FIG. 1 can be realized by Fig.11 The display device is manufactured by arranging the adhesive material layer according to the first profile 120-Ref.

[0271] Reference Fig.11 and Fig.12 , the display device 1 may include a central area CA displaying an image IMG and a peripheral area PA surrounding the central area CA and not displaying an image. The portion that emits light and is substantially visible to a user may be the central area CA. Fig.11 As described above, the width 123-WRef of the third portion 123-Ref of the first profile 120-Ref may be greater than the width of the peripheral area PA. Therefore, part of the third portion 123-Ref of the first profile 120-Ref may extend to the central area CA. Therefore, the portion of the third portion 123-Ref of the first profile 120-Ref in the central area CA may be visible as a stain in an approximately frame shape. This situation may cause the image quality of the display device 1 to deteriorate.

[0272] In the exemplary case of arranging the second profile 120' of the adhesive material layer according to the embodiment, the width 123'-W of the third portion 123' of the second profile 120' is smaller than the width of the peripheral area PA and thus does not extend to the central area CA. Figure 5E When the display device 1 is displayed on the display 1, the adhesive material layer may be invisible in the display device 1 displaying the image IMG, thereby preventing the image of the display device 1 from being degraded.

[0273] As described above, according to an embodiment, the width of the adhesive arranged in the peripheral area can be reduced. Therefore, the outline of the adhesive layer in the central area of ​​the displayed image can be prevented from being in a visible stripe shape. In some aspects, the area of ​​the displayed image can be increased by reducing the width of the peripheral area and increasing the width of the central area without being affected by the outline of the visible adhesive layer.

[0274] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope as defined in the appended claims.

Claims

1. A display device, comprising: a display panel, the display panel comprising a central area and a peripheral area surrounding the central area; a window, wherein the window is disposed on the display panel; a first adhesive layer disposed between the display panel and the window and along the peripheral area of ​​the display panel; a second adhesive layer between the display panel and the window and corresponding to the central area of ​​the display panel; as well as A third adhesive layer is between the display panel and the window and overlaps a portion of an upper surface of the first adhesive layer in the peripheral region of the display panel.

2. The display device according to claim 1, wherein: The second adhesive layer and the third adhesive layer are separated from each other.

3. The display device according to claim 1, wherein: In a cross-sectional view, the first adhesive layer comprises: A peak, wherein the thickness of the first adhesive layer is maximum at the peak, a first portion between the peak and a first edge adjacent to the central region, and a second portion between the peak and a second edge disposed opposite the first edge, wherein the second adhesive layer overlaps the first portion, and The third adhesive layer overlaps the second portion.

4. The display device according to claim 3, wherein: The peak width of the third adhesive layer is less than or equal to the width of the second portion.

5. The display device according to claim 3, wherein: The second adhesive layer directly contacts the upper surface of the first portion, and The third adhesive layer directly contacts an upper surface of the second portion. 6 . The display device of claim 1 , further comprising a fourth adhesive layer between the display panel and the window and between the first adhesive layer and the second adhesive layer.

7. The display device according to claim 6, wherein: The fourth adhesive layer directly contacts a portion of an upper surface of the first adhesive layer, and directly contacts a portion of an upper surface of the second adhesive layer.

8. The display device according to claim 1, wherein: In a plan view, at least one of the first adhesive layer and the third adhesive layer surrounds the central area.

9. A method for manufacturing a display device, the method comprising: On a display panel including a central area and a peripheral area surrounding the central area, arranging a first adhesive material layer along the peripheral area of ​​the display panel; disposing a second adhesive material layer so that the second adhesive material layer overlaps the central region and a first portion of the first adhesive material layer; as well as A third adhesive material layer is disposed on a second portion of the first adhesive material layer opposite to the first portion, wherein the third adhesive material layer is separated from the second adhesive material layer.

10. The method according to claim 9, wherein: In a cross-sectional view, the first adhesive material layer comprises: a peak at which the thickness is greatest, the first portion, the first portion being between the peak and a first edge adjacent to the central region, and the second portion, the second portion being between the peak and a second edge opposite the first edge, The second adhesive material layer directly contacts the upper surface of the first portion, and The third adhesive material layer directly contacts an upper surface of the second portion.

11. The method according to claim 10, wherein: A distance measured from an edge of the third adhesive material layer to another edge of the third adhesive material layer in a direction parallel to an upper surface of the display panel is less than or equal to a width of the second portion.

12. The method according to claim 9, wherein: In a plan view, at least one of the first adhesive material layer and the third adhesive material layer surrounds the central area.

13. The method according to claim 9, further comprising: semi-curing the first adhesive material layer by irradiating the first adhesive material layer with light; as well as semi-curing the second adhesive material layer and the third adhesive material layer by irradiating the second adhesive material layer and the third adhesive material layer with the light, The elastic modulus of the semi-cured second adhesive material layer and the elastic modulus of the semi-cured third adhesive material layer are different from the elastic modulus of the semi-cured first adhesive material layer.

14. A method for manufacturing a display device, the method comprising: On a display panel including a central area and a peripheral area surrounding the central area, arranging a first adhesive material layer along the peripheral area of ​​the display panel; disposing a second adhesive material layer on the display panel, separated from the first adhesive material layer and corresponding to the central area; disposing a third adhesive material layer on the first adhesive material layer; as well as A fourth adhesive material layer is arranged between the first adhesive material layer and the second adhesive material layer.

15. The method according to claim 14, wherein: In a cross-sectional view, the first adhesive material layer comprises: a peak at which the thickness is greatest, a first portion between the peak and a first edge adjacent to the central region, and A second portion is between the peak and a second edge opposite the first edge.

16. The method according to claim 15, wherein: The third adhesive material layer directly contacts the upper surface of the second portion, and The fourth adhesive material layer directly contacts an upper surface of the first portion.

17. The method according to claim 15, wherein: A distance measured from an edge of the third adhesive material layer to another edge of the third adhesive material layer in a direction parallel to an upper surface of the display panel is less than or equal to a width of the second portion.

18. The method according to claim 14, wherein: The second adhesive material layer and the third adhesive material layer are separated from each other.

19. The method according to claim 14, further comprising: semi-curing the first adhesive material layer and the second adhesive material layer by irradiating the first adhesive material layer and the second adhesive material layer with light; as well as The third adhesive material layer and the fourth adhesive material layer are semi-cured by irradiating the third adhesive material layer and the fourth adhesive material layer with the light.

20. The method according to claim 19, wherein: The elastic modulus of the semi-cured first adhesive material layer and the elastic modulus of the semi-cured second adhesive material layer are different from the elastic modulus of the semi-cured third adhesive material layer and the elastic modulus of the semi-cured fourth adhesive material layer.

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