Display device and electronic device including the same

Abstract

A display device and an electronic device including the same are provided. The display device includes: a display panel including a pixel structure; a polarizing plate disposed on the display panel and including a polarizer having a stretching axis in a first stretching direction parallel to an upper surface of the display panel; the display device includes a display panel having a first stretching direction, and a curl suppression layer disposed on or below the display panel, stretched in a second stretching direction crossing the first stretching direction, and including ultra-high molecular weight polyethylene (UHMWPE), the curl suppression layer being disposed on the display panel or below the display panel, the curl suppression layer being stretched in a second stretching direction crossing the first stretching direction, and the curl suppression layer including ultra-high molecular weight polyethylene (UHMWPE).

Description

Technical Field

[0001] This invention relates to a display device, a method for manufacturing the same, and an electronic device including the display device. More specifically, it relates to a display device including a display panel and a functional layer, a method for manufacturing the same, and an electronic device including the display device. Background Technology

[0002] For example, display devices such as organic light-emitting display devices and liquid crystal display devices may include a polarizing plate to prevent external light reflection and improve light efficiency. The polarizing plate may include a polarizer containing polyvinyl alcohol (PVA). The polarizer may acquire polarizing properties through dyeing, stretching processes, etc.

[0003] Recently, with the development of display devices with flexible, foldable, and / or bendable properties, the thickness of the substrate or panel included in the display device is decreasing. Consequently, the overall mechanical properties of the display device may also be susceptible to deformation or degradation due to the polarizing plate. Summary of the Invention

[0004] One of the technical problems to be solved by this disclosure is to provide a display device with improved mechanical properties and reliability.

[0005] One of the technical problems to be solved by this disclosure is to provide a method for manufacturing a display device with improved mechanical properties and reliability.

[0006] One of the technical problems to be solved by this disclosure is to provide an electronic device including a display device having improved mechanical properties and reliability.

[0007] The display device includes: a display panel including a pixel structure; a polarizing plate disposed on the display panel and including a polarizer having a stretching axis in a first stretching direction parallel to the upper surface of the display panel; and a curl suppression layer disposed on or below the display panel, stretched along a second stretching direction intersecting the first stretching direction, and comprising ultra-high molecular weight polyethylene (UHMWPE).

[0008] In several embodiments, the tensile modulus of the curl-inhibiting layer may be from 70 GPa to 130 GPa.

[0009] In some embodiments, the thickness of the curl suppression layer may be greater than the thickness of the polarizer.

[0010] In several embodiments, the thickness of the polarizer may be from 10 μm to 15 μm, and the thickness of the curl-suppression layer may be from 12 μm to 400 μm.

[0011] In several embodiments, the first stretching direction may form a first intersection angle with the length direction of the display panel, the second stretching direction may be parallel to the upper surface of the display panel, and the second stretching direction may form a second intersection angle with the first stretching direction.

[0012] In several embodiments, the first intersection angle may be 20° to 70°.

[0013] In some embodiments, the second cross angle may be 60° to 90°.

[0014] In several embodiments, the polarizing plate and the curl suppression layer may be stacked sequentially from the upper surface of the display panel.

[0015] In several embodiments, the curl suppression layer may be disposed between the display panel and the polarizing plate.

[0016] In several embodiments, the curl suppression layer may be configured as the outermost layer of the display device.

[0017] In several embodiments, the display device may further include: a cover panel disposed below the display panel, wherein the cover panel and the display panel may be stacked sequentially from the curl suppression layer.

[0018] In several embodiments, the display device may further include: a cover panel disposed below the display panel, wherein the curl suppression layer may be disposed between the display panel and the cover panel.

[0019] In several embodiments, the curl suppression layer may be directly attached to the upper or lower surface of the polarizer.

[0020] In several embodiments, the polarizing plate may further include a protective film attached to the surface of the upper and lower surfaces of the polarizer where the curl suppression layer is not attached.

[0021] In several embodiments, the display device may further include a quarter-wave plate disposed between the polarizer and the display panel. The curl-off suppression layer may be disposed between the quarter-wave plate and the polarizer.

[0022] The display device includes: a display panel including a pixel structure; a polarizing plate disposed on the display panel including a polarizer having a stretching axis in a first stretching direction parallel to the upper surface of the display panel; and a curl suppression layer disposed on or below the display panel, stretched along a second stretching direction intersecting the first stretching direction, and comprising a polymer film having a tensile modulus in the range of 70 GPa to 130 GPa.

[0023] In several embodiments, the curl-inhibiting layer may include ultra-high molecular weight polyethylene (UHMWPE).

[0024] In a method for manufacturing a display device, a polarizing plate including a polarizer having a stretching axis in a first stretching direction is prepared. A curl-suppressing layer comprising ultra-high molecular weight polyethylene (UHMWPE) is prepared and stretched along a second stretching direction. The polarizing plate and the curl-suppressing layer are then joined to a display panel such that the first stretching direction and the second stretching direction intersect each other.

[0025] In several embodiments, the pre-laminated material can be formed by extruding a preform of ultra-high molecular weight polyethylene (UHMWPE) in preparation of the curl-inhibiting layer. The pre-laminated material is then heated and stretched at a draw ratio of 30 to 200 to give it a tensile modulus of 70 GPa to 130 GPa, thereby producing an ultra-high molecular weight polyethylene (UHMWPE) film.

[0026] In several embodiments, multiple successive heating and stretching processes with sequentially increasing temperatures can be performed.

[0027] The electronic device includes: a display device according to the above embodiments; a driving circuit unit for driving the pixel structure of the display panel of the display device; and a circuit board for connecting the driving circuit unit to the display panel.

[0028] According to the above embodiments, a curl-suppressing layer having a stretching direction intersecting the stretching direction of the polarizing plate can be included within the display device. Using this curl-suppressing layer, the curling of the display device caused by the stretching or absorption axis of the polarizing plate can be buffered or suppressed.

[0029] According to embodiments of this disclosure, the curl-inhibiting layer may include ultra-high molecular weight polyethylene (UHMWPE), and the high modulus properties of UHMWPE can be used to prevent the display device from curling as a whole. Attached Figure Description

[0030] Figure 1 This is a schematic exploded perspective view illustrating a display device according to an exemplary embodiment.

[0031] Figure 2 and Figure 3 This is a schematic cross-sectional view illustrating a display device according to an exemplary embodiment.

[0032] Figure 4 and Figure 5 This is a partially enlarged cross-sectional view illustrating a display device according to an exemplary embodiment.

[0033] Figure 6 This is a schematic exploded perspective view showing the alignment of the stretching direction of the curl suppression layer and the polarizer.

[0034] Figure 7 This is a schematic perspective view illustrating the stretching process of a curl suppression layer according to an exemplary embodiment.

[0035] Figures 8 to 12 This is a schematic cross-sectional view illustrating the combination of a polarizing plate and a curl suppression layer according to an exemplary embodiment.

[0036] Figures 13 to 15 This is a schematic cross-sectional view illustrating a display device according to an exemplary embodiment.

[0037] Figures 16 to 19 This is a schematic cross-sectional view illustrating a method of manufacturing a display device according to an exemplary embodiment.

[0038] Figure 20 and Figure 21 This is a schematic cross-sectional view illustrating a method of manufacturing a display device according to several embodiments.

[0039] Figure 22 This is a block diagram of an electronic device according to one embodiment.

[0040] Figure 23 This is a schematic diagram of an electronic device according to various embodiments. Detailed Implementation

[0041] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals will be used for the same constituent elements in the drawings, and repeated descriptions of the same constituent elements will be omitted. The embodiments disclosed in the accompanying drawings are exemplary and should be understood to include all modifications, equivalents, and even substitutions encompassed within the concept and scope of the present invention.

[0042] The terms “above,” “connected,” “combined,” etc., used in this specification include not only cases of direct arrangement / connection / combination, but also cases where other constituent elements are arranged in between.

[0043] Terms such as “first,” “second,” “third,” “below,” “lower side,” “above,” “upper side,” “bottom surface,” and “upper surface” are used as relative concepts to distinguish their different components or positions, and do not specify absolute positions or orders.

[0044] For example, the terms "first adhesive layer 50", "second adhesive layer 60" and "third adhesive layer 70" mentioned in this application are used to distinguish the adhesive layers used to attach the polarizing plate 200, the curl suppression layer 300 and the window structure WS, respectively.

[0045] The term “A directly attached to B” as used in this application includes both the case where A is directly formed to contact the surface of B and the case where A is directly attached to the surface of B via an adhesive layer (with no other components between A and B besides the adhesive layer).

[0046] Figure 1 This is a schematic exploded perspective view illustrating a display device according to an exemplary embodiment.

[0047] Reference Figure 1 The display device DD may include a window structure WS, a display panel DP, and a cover panel CP.

[0048] The display device DD may include a liquid crystal display (LCD) device, an organic light-emitting diode (OLED) display device, a quantum dot light-emitting diode (QLED) display device, a quantum dot (QD)-organic light-emitting diode (OLED) display device, etc. According to an exemplary embodiment, the display device DD can be implemented as an electronic device in the form of a mobile phone.

[0049] exist Figure 1 In this context, the first direction and the second direction can refer to two directions that are parallel to and intersect each other with the display surface of the window structure WS and / or the display panel DP. For example, the first direction and the second direction can be orthogonal to each other.

[0050] For example, the first direction may correspond to the length direction of the display device DD or the display panel DP, and the second direction may correspond to the width direction of the display device DD or the display panel DP.

[0051] The third direction can be perpendicular to the first and second directions. This third direction can correspond to the thickness direction of the display device (DD) or the display panel (DP).

[0052] The above definitions of direction can be applied in the same way in the following figures.

[0053] Along the third direction, a cover panel CP, a display panel DP, and a window structure WS can be stacked in sequence.

[0054] The window structure WS can provide the external display surface of the display device DD that is recognizable to the user, and may include a transparent material film. For example, the window structure WS may include glass (e.g., ultra-thin glass (UTG)), a hard-coated film, a plastic film, etc.

[0055] The outer surface of the window structure WS may include an active area AA and a peripheral area PA. The active area AA provides a surface that substantially displays the image of the display device DD and is subject to user touch / command input. The peripheral area PA may substantially correspond to the border area of ​​the display device DD.

[0056] The display panel DP may include a display area DA and a non-display area NDA. The display area DA of the display panel DP may substantially correspond to or overlap with the active area AA of the window structure WS. The non-display area NDA of the display panel DP may substantially correspond to or overlap with the peripheral area PA of the window structure WS.

[0057] The cover panel CP can be configured as the rear panel or rear housing of the display device DD. The cover panel CP may include a plate (e.g., an SUS board) that supports the display panel DP, circuit board (PCB), etc. The cover panel CP may include an elastomer for absorbing impacts from the display device DD.

[0058] According to embodiments of the present disclosure, a polarizing plate 200 and a curl suppression layer 300 may be arranged on a display panel DP.

[0059] In some embodiments, the window structure WS can be omitted. In this case, the display device DD can be configured as an ultra-thin (UT) display.

[0060] Figure 2 and Figure 3 This is a schematic cross-sectional view illustrating a display device according to an exemplary embodiment. For ease of explanation, in... Figure 2 and Figure 3 The illustration of the overlay panel CP is omitted.

[0061] Reference Figure 2 The display device may include a display panel DP and a polarizing plate 200 and a curl suppression layer 300 stacked on the display panel DP. The display panel DP may include a base substrate 100, a circuit layer CL stacked on the base substrate 100 and a pixel structure PXS disposed on the circuit layer CL.

[0062] The base substrate 100 can be configured as a support substrate or a back-plane substrate for an image display device. The base substrate 100 can be a glass substrate or a plastic substrate.

[0063] In several embodiments, the base substrate 100 may include a polymer material that is transparent and flexible. In this case, the base substrate 100 can be used for a transparent flexible display device. For example, the base substrate 100 may include polymeric materials such as polyimide, polysiloxane, epoxy resin, acrylic resin, and polyester. In one embodiment, the base substrate 100 may include polyimide.

[0064] The circuit layer CL may include transistors TR1, TR2, and TR3. The circuit layer CL may include wiring layers forming a thin-film transistor array (TFT-Array) and an insulating layer.

[0065] The circuit layer CL may also include a buffer layer 105 formed on the upper surface of the base substrate 100. The buffer layer 105 can block moisture that permeates through the base substrate 100 and can also block the diffusion of foreign matter between the base substrate 100 and the structures formed on the base substrate 100.

[0066] For example, buffer layer 105 may include silicon oxide, silicon nitride, or silicon oxide nitride. These may be used individually or in combination of two or more. In some embodiments, buffer layer 105 may have a stacked structure including a silicon oxide film and a silicon nitride film.

[0067] The buffer layer 105 can be formed by deposition processes such as chemical vapor deposition (CVD), sputtering, or atomic layer deposition (ALD), in a manner that includes the aforementioned inorganic insulating material.

[0068] Transistors TR1, TR2, and TR3 can be arranged on the buffer layer 105. The first transistor TR1, the second transistor TR2, and the third transistor TR3 can be electrically connected to the first light-emitting element ED1, the second light-emitting element ED2, and the third light-emitting element ED3, respectively.

[0069] Each of transistors TR1, TR2, and TR3 may include an active layer 110, a gate insulating layer 120, a gate electrode 130, and connection electrodes 150 and 160.

[0070] The active layer 110 can be disposed on the buffer layer 105 and can be patterned, for example, by photolithography to repeat / regularly arrange itself in each pixel. The active layer 110 can include a silicon compound such as polysilicon. A portion of the active layer 110 can be doped with p-type or n-type dopant and can include source regions, drain regions, and channel regions.

[0071] The active layer 110 may also include oxide semiconductors such as indium gallium zinc oxide (IGZO), zinc tin oxide (ZTO), or ITZO.

[0072] A gate insulating layer 120 can be formed on the active layer 110, and a gate electrode 130 can be stacked on the gate insulating layer 120. For example... Figure 3 As shown, the gate insulating layer 120 can be formed in a pattern that partially covers each active layer 110. In contrast, the gate insulating layer 120 can extend continuously across multiple pixels or light-emitting regions and can be collectively included in the first transistor TR1, the second transistor TR2, and the third transistor TR3.

[0073] The gate electrode 130 may overlap with the channel region of the active layer 110 in the vertical direction.

[0074] The gate insulating layer 120 can be formed by the above-described deposition process using an inorganic insulating material including silicon oxide, silicon nitride, silicon oxide nitride, etc. In some embodiments, it can be formed by a photolithography process in which the gate electrode 130 is substantially used as an etching mask. Figure 2 The gate insulating layer 120 is patterned as shown.

[0075] In several embodiments, the gate electrode 130 and the gate insulating layer 120 can be used as an ion implantation mask, thereby forming the source region and the drain region in the active layer 110.

[0076] An interlayer insulating layer 140 covering the gate insulating layer 120 and the gate electrode 130 may be formed on the active layer 110. Connection electrodes 150 and 160 that are in contact with or electrically connected to the active layer 110 may be formed on the interlayer insulating layer 140.

[0077] The interlayer insulating layer 140 can be formed by the above-described deposition process using an inorganic insulating material including silicon oxide, silicon nitride, silicon nitride, etc. The interlayer insulating layer 140 can be formed as a single-layer structure or a multilayer structure including different materials.

[0078] In several embodiments, when the active layer 110 comprises an oxide semiconductor, hydrogen (H) included in the interlayer insulating layer 140 can be diffused or moved to the active layer 110 by a thermal processing process during the formation of the interlayer insulating layer 140. Accordingly, the carrier concentration increases due to hydrogen, thereby enabling the formation of the source region and the drain region with increased conductivity on the sides of the active layer 110.

[0079] The connecting electrodes 150 and 160 can penetrate the interlayer insulating layer 140 and can be connected to the active layer 110. When the gate insulating layer 120 is formed together and continuously in multiple pixel regions, the connecting electrodes 150 and 160 can together penetrate the gate insulating layer 120.

[0080] The connecting electrodes 150 and 160 may include a source electrode 150 connected to or in contact with the source region of the active layer 110 and a drain electrode 160 connected to or in contact with the drain region of the active layer 110.

[0081] Contact holes can be formed by locally etching the interlayer insulating layer 140. For example, contact holes can be formed to expose the source region and the drain region, respectively. After forming a metal layer on the interlayer insulating layer 140 that sufficiently fills the contact holes, the source electrode 150 and the drain electrode 160 can be formed by locally etching the metal layer.

[0082] The gate electrode 130 and the connecting electrodes 150 and 160 may include metals such as Ag, Mg, Al, W, Cu, Ni, Cr, Mo, Ti, Pt, Ta, Nd, and Sc, their alloys, or their nitrides. The gate electrode 130 and the connecting electrodes 150 and 160 may be formed by the deposition process and photolithography process described above.

[0083] A planarization layer 170 covering the connecting electrodes 150 and 160 can be formed on the interlayer insulating layer 140. The planarization layer 170 can accommodate a via structure that electrically connects the pixel electrode 180 to the drain electrode 160.

[0084] In several embodiments, the planarization layer 170 may include organic materials such as polyimide, epoxy resin, acrylic resin, polyester, siloxane resin, benzocyclobutene (BCB), etc. The planarization layer 170 may be formed by the deposition process or spin coating process described above.

[0085] Each pixel may have a pixel electrode 180 and be electrically connected to transistors TR1, TR2, and TR3. The pixel electrode 180 may be formed on the planarization layer 170 and be electrically connected to the drain electrode 160.

[0086] For example, a via exposing the upper surface of the drain electrode 160 can be formed by locally etching the planarization layer 170. After forming a conductive layer on the upper surface of the planarization layer 170 that sufficiently fills the via and comprises a metallic material or a transparent conductive oxide, the pixel electrode 180 can be formed by etching the conductive layer.

[0087] The pixel electrode 180 is configured as an anode and may include a high work function conductive material that promotes hole injection. The pixel electrode 180 may be configured as a transmissive electrode. The pixel electrode 180 may include transparent conductive oxides such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and indium tin zinc oxide (ITZO).

[0088] The pixel electrode 180 may also be configured as a semi-transmissive electrode or a reflective electrode. The pixel electrode 180 may include metals selected from Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo, Ti, W, In, Sn, Zn, alloys of two or more of them, or compounds containing at least one of them (e.g., LiF).

[0089] The pixel electrode 180 can have a single-layer structure or a multi-layer structure. For example, the pixel electrode 180 can have a three-layer structure of ITO / Ag / ITO.

[0090] A pixel structure PXS, including a pixel definition film (PDL) and a light-emitting part, can be arranged on the circuit layer CL.

[0091] A pixel definition film (PDL) can be formed on the planarization layer 170 and expose the upper surface of the pixel electrode 180. The light-emitting region can be defined by the sidewalls of the pixel definition film (PDL). The red light-emitting region, the green light-emitting region, and the blue light-emitting region can be separated and defined by the pixel definition film (PDL), and the first light-emitting element ED1, the second light-emitting element ED2, and the third light-emitting element ED3 can correspond to the blue light-emitting element, the green light-emitting element, and the red light-emitting element, respectively.

[0092] In some embodiments, the light-emitting elements ED1, ED2, and ED3 may all be white light-emitting elements or blue light-emitting elements.

[0093] Light-emitting elements can be arranged within each light-emitting region formed by the pixel-defined film (PDL). According to an exemplary embodiment, the light-emitting element may include a light-emitting layer (EL) containing an organic light-emitting material. For example, the light-emitting layer (EL) may include a fluorescent host and / or a phosphorescent host, and may also include a fluorescent dopant, a phosphorescent dopant, and / or a thermally activated delayed fluorescence (TADF) dopant.

[0094] For example, the light-emitting part can be formed by processes such as vacuum deposition, spin coating, inkjet printing, laser printing, casting, laser thermal transfer, etc.

[0095] Opposing electrodes 190 may be arranged on the upper surface of the pixel definition film (PDL) and on the light-emitting part. The opposing electrodes 190 may be common electrodes that are commonly and continuously disposed in multiple light-emitting areas or pixels.

[0096] The counter electrode 190 can be configured as an electron injection electrode or a cathode. The counter electrode 190 can include metals, alloys, conductive compounds, etc., with low work function.

[0097] For example, the counter electrode 190 may include lithium (Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), ytterbium (Yb), silver-ytterbium (Ag-Yb), ITO, IZO, etc. These can be used individually or in combination of two or more.

[0098] The counter electrode 190 can be configured as a transmission electrode, a semi-transmission electrode, or a reflection electrode. The counter electrode 190 can have a single-layer structure or a multi-layer structure.

[0099] The light-emitting portion may further include a hole transport layer (HTL) and an electron transport layer (ETL). According to an exemplary embodiment, the hole transport layer (HTL), the light-emitting layer (EL), the electron transport layer (ETL), and the counter electrode (190) may be sequentially stacked from the upper surface of the pixel electrode (180).

[0100] For example, a hole transport layer (HTL) may include 4,4',4''-[tris(3-methylphenyl)phenylamino]triphenylamine (m-MTDATA: 4,4',4"-[tris(3-methylphenyl)phenylamino]triphenylamine), 4,4',4''-tris(N,N-diphenylamino)triphenylamine (TDATA: 4,4'4"-tris(N,N-diphenylamino)triphenylamine), 4,4',4''-tris[N-(2-naphthyl)-N-phenylamino]triphenylamine (2-TNATA: 4,4',4"-tris[N-(2-naphthyl)-N-phenylamino]-triphenylamine), and N,N'-di(n-naphthyl)-N,N'-diphenyl-benzidine (NPB: N,N'-di(n-naphthyl)-N,N'-diphenyl-benzidine). Hole transport substances such as aphthalene-1-yl)-N,N'-diphenyl-benzidine, N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD: N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine), 4,4',4''-tris(N-carbazolyl)triphenylamine (TCTA: 4,4',4"-tris(N-carbazolyl)triphenylamine), and poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate) (PEDOT / PSS: poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate)).

[0101] For example, the electron transport layer (ETL) can include compounds such as anthracene compounds, tris(8-hydroxyquinolinato)aluminum (Alq3: tris(8-hydroxyquinolinato)aluminum), 1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene (TPBi: 1,3,5-Tri(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP: 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), 4,7-diphenyl-1,10-phenanthroline (Bphen: 4,7-diphenyl-1,10-phenanthroline), and 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ: 3-(4-biphenylyl) Electron transport substances such as 4-phenyl-5-tert-butylphenyl-1,2,4-triazole, 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ: 4-(naphthalen-1-yl)-3,5-diphenyl-4H-1,2,4-triazole), 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (tBu-PBD: 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), and bis(2-methyl-8-hydroxyquinoline-N1,O8)-(1,1'-biphenyl-4-hydroxy)aluminum (BAlq: bis(2-methyl-8-quinolinolato-N1,O8)-(1,1'-biphenyl-4-olato)aluminum).

[0102] In some embodiments, a hole injection layer may also be arranged between the pixel electrode 180 and the hole transport layer HTL.

[0103] In several embodiments, such as Figure 2 The light-emitting layer EL shown includes layers of the aforementioned light-emitting portions that can be specifically patterned within a light-emitting area defined by a pixel-defining film PDL. Accordingly, in each of the plurality of pixels, the light-emitting portions can be separated from each other in the form of spaced-apart islands.

[0104] In several embodiments, the layer included in the light-emitting portion described above may extend continuously and jointly over the upper surface of the multiple pixels and the pixel definition film (PDL).

[0105] In several embodiments, a TFE encapsulation layer covering the pixel structure PXS may be disposed on the display panel DP. In one embodiment, the TFE encapsulation layer may also be included in the display panel DP as a component of the display panel DP.

[0106] The encapsulation layer TFE can be placed on the pixel definition film PDL and the light-emitting elements ED1, ED2, and ED3 to protect the light-emitting elements ED1, ED2, and ED3 from moisture or oxygen.

[0107] The encapsulation layer TFE may include an inorganic film (including silicon nitride (SiN)). x ), silicon oxide (SiO) x (Indium tin oxide, indium zinc oxide or any combination thereof), organic membranes (including polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, acrylic resins (e.g., polymethyl methacrylate, polyacrylic acid, etc.), epoxy resins (e.g., aliphatic glycidyl ether, etc.) or combinations thereof), or combinations of inorganic and organic membranes.

[0108] The encapsulation layer TFE can be formed as a single-layer structure or a multi-layer structure. In some embodiments, the encapsulation layer TFE can have a structure in which a first encapsulation layer, an organic layer, and a second inorganic layer are stacked in sequence.

[0109] In several embodiments, the display panel DP may further include a color control unit arranged on the pixel structure PXS. The color control unit may include color filters corresponding to each light-emitting element ED1, ED2, ED3 or each pixel.

[0110] The color filter can selectively allow only light of a specific wavelength band to pass through, while substantially absorbing the rest of the light. Accordingly, the color purity of the display device DD can be increased while reducing external light reflection.

[0111] The color filter may include a first color filter that transmits blue light with a center wavelength in the range of, for example, 420 nm to 480 nm, a second color filter that transmits green light with a center wavelength in the range of, for example, 500 nm to 580 nm, and a third color filter that transmits red light with a center wavelength in the range of, for example, 600 nm to 670 nm.

[0112] The first color filter, the second color filter, and the third color filter can correspond to the first light-emitting element ED1, the second light-emitting element ED2, and the third light-emitting element ED3, respectively.

[0113] The color control unit may include a color conversion unit, for example, comprising quantum dots, disposed between the color filter and the light-emitting element. The display device DD may be a QD-OLED device. For example, the color of the emitted light can be adjusted according to the particle size of the quantum dots. The quantum dots may be classified as blue quantum dots, red quantum dots, green quantum dots, etc.

[0114] The color conversion unit may include a first color conversion layer, a second color conversion layer, and a third color conversion layer that correspond to the first light-emitting element ED1, the second light-emitting element ED2, and the third light-emitting element ED3, respectively, and are superimposed on the third light-emitting element.

[0115] According to an exemplary embodiment, blue light with a center wavelength in the range of, for example, 420 nm to 480 nm can be generated from the light-emitting portion. The first color conversion layer corresponding to the first light-emitting element ED1 allows the blue light to be transmitted. The color conversion layer may include a scatterer but not quantum dots. The scatterer may include TiO2, ZnO, Al2O3, SiO2, hollow silica, etc. These may be used individually or in combination of two or more.

[0116] The second color conversion layer corresponding to the second light-emitting element ED2 can convert the blue light into green light with a center wavelength in the range of, for example, 500 nm to 580 nm.

[0117] The third color conversion layer corresponding to the third light-emitting element ED3 can convert the blue light into red light with a center wavelength in the range of, for example, 600 nm to 670 nm.

[0118] In several embodiments, the first light-emitting element ED1, the second light-emitting element ED2, and the third light-emitting element ED3 may be light-emitting elements in a tandem structure that emits the same white light or blue light, respectively. In each pixel or each light-emitting region defined by the pixel definition film PDL, the first light-emitting element ED1, the second light-emitting element ED2, and the third light-emitting element ED3 may be stacked in the third direction with a charge generation layer between them.

[0119] A polarizing plate 200 and a curl suppression layer 300 can be arranged on the display panel DP.

[0120] The polarizing plate 200 may include a polarizer 220. The polarizing plate 200 can be configured with a protective film by attaching a protective film to the surface of the polarizer 220.

[0121] Polarizer 220 may include a polyvinyl alcohol (PVA) film dyed with iodine. Polarizer 220 may be stretched along a specific uniaxial direction, thereby providing polarization properties according to the orientation of iodine molecules.

[0122] The protective film may include a first protective film 210 attached to the bottom surface of the polarizer 220 and a second protective film 230 attached to the upper surface of the polarizer 220.

[0123] Protective films 210 and 230 may include resin films with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, and isotropic characteristics. For example, protective films 210 and 230 may include acrylic resin films such as polymethyl methacrylate and polyethyl methacrylate; polyester resin films such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; cellulose resin films such as cellulose diacetate and cellulose triacetate; and polyolefin resin films such as polyethylene, polypropylene, polyolefins having cyclic or norbornene structures, and ethylene-propylene copolymers. In some embodiments, protective films 210 and 230 may include cellulose resin films such as cellulose triacetate (TAC).

[0124] In several embodiments, the protective films 210 and 230 can be attached to the polarizer 220 via an adhesive layer. For example, after coating the attachment surface of the polarizer 220 or the protective films 210 and 230 with a photocurable adhesive composition, the adhesive composition can be cross-linked by an exposure process to form the adhesive layer. The photocurable adhesive composition may include an acrylate photopolymerizable compound, a photopolymerization initiator, and a solvent.

[0125] The term "adhesive layer" as used in this application is used to include the meaning of an adhesive layer or bonding layer.

[0126] A curl suppression layer 300 may be stacked on the polarizer 200. According to embodiments of the present disclosure, the curl suppression layer 300 may comprise a polymer film stretched in a direction intersecting the stretching direction of the polarizer 220.

[0127] According to an exemplary embodiment, the curl suppression layer 300 may include ultra-high molecular weight polyethylene (UHMWPE). UHMWPE may have a weight-average molecular weight in the range of 1 million or more (e.g., 2 million to 8 million or 3 million to 7 million).

[0128] The curl suppression layer 300 can be aligned with the polarizer 220 such that the stretching direction of the curl suppression layer 300 intersects the stretching direction of the polarizer 220. Therefore, it can buffer or absorb the curl generated in the absorption axis direction of the polarizer 220.

[0129] The tensile direction and physical properties of the curl suppression layer 300 will be referenced. Figure 6 and Figure 7 More details will follow.

[0130] A window structure WS can be stacked on the curl suppression layer 300.

[0131] In several embodiments, the polarizing plate 200 can be attached to the display panel DP or the encapsulation layer TFE via the first adhesive layer 50. The curl suppression layer 300 can be attached to the polarizing plate 200 via the second adhesive layer 60. The window structure WS can be attached to the curl suppression layer 300 via the third adhesive layer 70.

[0132] The first adhesive layer 50, the second adhesive layer 60, and the third adhesive layer 70 may include adhesive substances such as optically clear adhesive (OCA) and optically clear resin (OCR).

[0133] Reference Figure 3 The display device may further include a touch sensor layer TS. In several embodiments, the touch sensor layer TS may be included in the display device in a modular form, comprising a touch sensor substrate TSS and a sensing electrode layer TSE formed on the upper surface of the touch sensor substrate TSS. In this case, an adhesive layer is formed between the bottom surface of the touch sensor substrate TSS and the encapsulation layer TFE, thereby allowing the modular touch sensor layer TS to be attached to the encapsulation layer TFE.

[0134] In some embodiments, the touch sensor substrate (TSS) may be omitted. The sensing electrode layer (TSE) may be disposed in an on-cell type, deposited (e.g., directly deposited) and patterned on the encapsulation layer (TFE).

[0135] The polarizing plate 200 can be arranged on the touch sensor layer TS through the first adhesive layer 50, thereby effectively suppressing or reducing external light reflection caused by the sensing electrode layer TSE.

[0136] Figure 4 and Figure 5 This is a partially enlarged cross-sectional view illustrating a display device according to an exemplary embodiment. For example, Figure 4 and Figure 5It is a partially enlarged cross-sectional view including the border area or surrounding area of ​​the display device.

[0137] Reference Figure 4 As described above, an encapsulation layer TFE can be formed on the display panel DP, which includes a base substrate 100, a circuit layer CL, and a pixel structure PXS. A polarizing plate 200 and a curl suppression layer 300 are sequentially arranged on the encapsulation layer TFE. A window structure WS can be attached to the curl suppression layer 300.

[0138] An integrated circuit chip (IC) may be disposed on one end of the peripheral region of the base substrate 100. The integrated circuit chip (IC) may be mounted on the base substrate 100 in a chip-on-glass (COG) configuration (e.g., direct mounting), or may be electrically connected to the base substrate 100 via an additional film in a chip-on-film (COF) configuration.

[0139] One end of a circuit board (e.g., a flexible printed circuit board, FPC) can be bonded to an integrated circuit chip (IC) via, for example, an anisotropic conductive film (ACF), and the other end of the circuit board (e.g., the flexible printed circuit board, FPC) can be bent toward the bottom surface of a cover panel (CP). Accordingly, the other end of the flexible printed circuit board (FPC) can be electrically connected to a circuit structure (CS) disposed below the bottom surface of the cover panel (CP). The circuit structure (CS) may include a drive circuit section such as a rigid printed circuit board, a drive circuit chip, etc.

[0140] As described above, the display device can be implemented as an electronic device including a circuit board and a driving circuit section.

[0141] Reference Figure 5 The display device can be implemented in the form of an ultra-thin (UT) display. According to an exemplary embodiment, the base substrate 100 can be changed to an ultra-thin substrate such as UTG, and the thickness of the display panel DP can be reduced to the range of 0.05 mm to 0.3 mm or 0.1 mm to 0.25 mm.

[0142] In some embodiments, the encapsulation layer TFE may be omitted, and the polarizer 200 may be attached (e.g., directly attached) to the display panel DP via, for example, the first adhesive layer 50.

[0143] In some embodiments, this may also be omitted. Figure 4 The window structure WS. In this case, the curl suppression layer 300 can be arranged on the polarizing plate 200 to serve as a substantial window of the display device. For example, the curl suppression layer 300 can be set as the outermost outermost layer of the display device exposed to the outside, and can be set as the user's visible surface.

[0144] As described above, the curl suppression layer 300 can have a high tensile strength and high modulus structure, while also possessing improved transparency and impact absorption properties. Therefore, it can buffer or suppress curling caused by the polarizing plate 200, and can also be effectively used as an external protective layer for the display device.

[0145] Figure 6 This is a schematic exploded perspective view showing the alignment of the stretching direction of the curl suppression layer and the polarizer.

[0146] Reference Figure 6 The polarizer 220 included in the polarizer 200 can be stretched along a first stretching direction. Accordingly, the polarizer 220 can have a stretching axis or an absorption axis in the first stretching direction.

[0147] For example, polarizer 220 can be a membrane in which dichroic pigments are adsorbed and oriented onto a stretched polyvinyl alcohol resin film. The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin.

[0148] Examples of polyvinyl acetate resins include polyvinyl acetate as a homopolymer of vinyl acetate, or copolymers of vinyl acetate with other monomers that can copolymerize therewith. Examples of other monomers that can copolymerize with said vinyl acetate include unsaturated carboxylic acid monomers, unsaturated sulfonic acid monomers, olefin monomers, vinyl ether monomers, and acrylamide monomers having an ammonium group.

[0149] The degree of saponification of the polyvinyl alcohol resin can be from 85 mol% to 100 mol%, preferably more than 98 mol%.

[0150] For example, the polarizer 220 can be manufactured continuously through processes such as uniaxial stretching of a polyvinyl alcohol film, dyeing and adsorption of dichroic pigments, boric acid solution treatment, washing, and drying. The polarizer 220 having a first stretching axis or absorption axis having the first stretching direction can be formed by the uniaxial stretching.

[0151] According to an exemplary embodiment, the acute angle (first intersection angle) formed by the first stretching direction and the first direction (the length direction of the display device) can be 20° to 70°. In one embodiment, the first intersection angle can be 30° to 60°, or 35° to 55°.

[0152] The curl-resistance layer 300 may be a film stretched along a second stretching direction and having a second stretching axis. The second stretching direction may be parallel to both the upper surface of the display device or display panel DP and the first stretching direction, and may form a second intersection angle with the first stretching direction.

[0153] The second crossing angle may refer to an angle less than 90° of the angle formed by the first tension axis and the second tension axis, and the second crossing angle may be between 60° and 90°. In some embodiments, the second crossing angle may be between 70° and 90°, 80° and 90°, or 85° and 90°. In one embodiment, the second crossing angle may be substantially 90°.

[0154] The first stretching axis of the polarizer 200 may cause the display panel DP to curl or warp. For example, it may cause the two ends or two edges of the display panel DP in the first stretching direction to curl or warp upward toward the display surface (e.g., the viewable side). This curling or warping may... Figure 5 This is further exacerbated in the ultra-thin (UT) display shown.

[0155] According to embodiments of this disclosure, the curl suppression layer 300 having the second stretching axis can be arranged such that the first stretching axis and the second stretching axis form the second intersection angle within the display device. Therefore, the curling or warping caused by the polarizing plate 200 can be buffered or suppressed.

[0156] Furthermore, as referenced Figure 7 As described later, the curl suppression layer 300 includes an ultra-high molecular weight polyethylene (UHMWPE) film with high modulus properties, and can suppress the overall curling of the display device through its high modulus properties.

[0157] Figure 7 This is a schematic perspective view illustrating the stretching process of a curl suppression layer according to an exemplary embodiment.

[0158] Reference Figure 7 (a) can be formed by extruding a preform of ultra-high molecular weight polyethylene (UHMWPE) in powder or granular form using a pair of rollers to form a pre-laminated component.

[0159] The pre-laminated part has a form in which crystalline part 310 and amorphous part 320 coexist, and in fact the volume or length of amorphous part 320 can be relatively large.

[0160] Reference Figure 7 (b) The pre-laminated part can be stretched along the second stretching direction (the arrow directions in (b) and (c)) by a heat stretching process. Accordingly, while the length of the amorphous part 320 is reduced, the volume and length of the crystalline part 310 can be increased.

[0161] Reference Figure 7(c) When the heating and stretching process is added, the volume or length of the crystallized part 310 is further increased, and the draw ratio and modulus can be increased.

[0162] For example, Figure 7 (b) shows the stretch ratio states in the range of 3 to 80. Figure 7 (c) shows the stretch ratio state of more than 100.

[0163] The temperature of the heating and stretching process can be in the range of 120°C to 160°C, and in one embodiment, it can be in the range of 130°C to 155°C. In several embodiments, the heating and stretching process may include multiple sequential heating and stretching operations. The temperature of each heating and stretching operation can be increased sequentially, and multiple heating and stretching operations can be performed continuously.

[0164] For example, the heating and stretching process may include a first heating and stretching performed at a temperature above 120°C and below 140°C, a second heating and stretching performed at a temperature above 140°C and below 150°C, and a third heating and stretching performed at a temperature above 150°C and below 160°C (or below 155°C).

[0165] By sequentially performing the first heating stretching to the third heating stretching, the uniformity of the physical properties of the ultra-high molecular weight polyethylene (UHMWPE) film can be improved, and a constant overall stretch ratio of the film can be provided.

[0166] The stretching ratio can be the ratio of the length of the film after the heat stretching process to the length of the film in the pre-laminated state.

[0167] For example, the stretching speed of the heated stretching process can be 40 mm / min to 80 mm / min, 45 mm / min to 70 mm / min, or 50 mm / min to 65 mm / min. Within these ranges, a uniform stretching ratio can be easily ensured.

[0168] The stretch ratio of the curl-inhibiting layer 300 or the ultra-high molecular weight polyethylene (UHMWPE) film can be from 30 to 200. In one embodiment, the stretch ratio of the curl-inhibiting layer 300 or the ultra-high molecular weight polyethylene (UHMWPE) film can be from 40 to 150 or from 50 to 130.

[0169] The tensile modulus of the curl-inhibiting layer 300 or the ultra-high molecular weight polyethylene (UHMWPE) film can be from 70 GPa to 130 GPa. In one embodiment, the tensile modulus of the curl-inhibiting layer 300 or the ultra-high molecular weight polyethylene (UHMWPE) film can be from 70 GPa to 125 GPa or from 75 GPa to 100 GPa.

[0170] The tensile modulus can be measured according to the ASTM D638 measurement standard.

[0171] Within the range of the specified stretch ratio and tensile modulus, sufficient curl suppression effect can be achieved through the high modulus characteristics of the curl suppression layer 300 without hindering the overall flexibility of the display device. Furthermore, within the range of the specified stretch ratio, the curl suppression layer 300 can possess sufficient transparency, such as... Figure 5 As shown, the curl suppression layer 300 can essentially be directly set as the external protective film of the display device.

[0172] The thickness of the curl suppression layer 300 can be greater than or equal to the thickness of the polarizer 220 (e.g., a PVA stretched resin film). In one embodiment, the thickness of the curl suppression layer 300 can be greater than the thickness of the polarizer 220.

[0173] For example, the thickness of polarizer 220 can be from 10 μm to 15 μm. The thickness of curl suppression layer 300 can be from 12 μm to 400 μm, 15 μm to 300 μm, or 20 μm to 200 μm. Within the range of these thicknesses, curling caused by polarizer 220 can be buffered, while curling caused by other components of the display device can also be sufficiently suppressed by curl suppression layer 300.

[0174] Figures 8 to 12 This is a schematic cross-sectional view illustrating the combination of a polarizing plate and a curl suppression layer according to an exemplary embodiment.

[0175] Reference Figure 8 and Figure 9 The curl suppression layer 300 can also be included as a protective film for the polarizer 220. Accordingly, the curl suppression layer 300 can be included in the polarizer 200 as a substantially integrated component or part.

[0176] like Figure 8 As shown, the curl suppression layer 300 can substantially replace the second protective film 230 of the polarizer 200. The curl suppression layer 300 can be directly attached to the upper surface of the polarizer 220. For example, the curl suppression layer 300 can be directly attached to the upper surface of the polarizer 220 through the second polarizer adhesive layer PAL2.

[0177] The first protective film 210 can be attached to the bottom surface of the polarizer 220 through the first polarizer adhesive layer PAL1.

[0178] like Figure 9As shown, the curl suppression layer 300 can substantially replace the first protective film 210 of the polarizer 200. The curl suppression layer 300 can be directly attached to the bottom surface of the polarizer 220. For example, the curl suppression layer 300 can be directly attached to the bottom surface of the polarizer 220 through the first polarizer adhesive layer PAL1.

[0179] The second protective film 230 can be attached to the upper surface of the polarizer 220 through the second polarizer adhesive layer PAL2.

[0180] Reference Figure 10 The polarizer 200 may also include a quarter-wave plate 240 (denoted by λ / 4). The quarter-wave plate 240 may be arranged below the polarizer 220 and may be adjacent to the display panel DP than the polarizer 220.

[0181] External light incident through polarizer 220 can be converted into circularly polarized light by quarter-wave plate 240, and can be reflected again by display panel DP to be converted into circularly polarized light in the opposite direction. The reflected external light can be converted into linearly polarized light by quarter-wave plate 240, and can be absorbed by polarizer 220.

[0182] like Figure 10 As shown, a quarter-wave plate 240, a polarizer 220, and a curl-off suppression layer 300 can be stacked sequentially. For example, the curl-off suppression layer 300 can be attached to the second protective film 230 of the polarizer 200 via a second adhesive layer 60. The first protective film 210 and the second protective film 230 can be attached to the bottom and top surfaces of the polarizer 220 respectively via a first polarizer adhesive layer PAL1 and a second polarizer adhesive layer PAL2.

[0183] Reference Figure 11 The curl suppression layer 300 can be disposed below the quarter-wave plate 240. For example, the curl suppression layer 300 can be attached to the bottom surface of the quarter-wave plate 240 via the second adhesive layer 60.

[0184] Reference Figure 12 The curl suppression layer 300 can also be arranged between the polarizer 220 and the quarter-wave plate 240.

[0185] For example, the bottom surface of the curl suppression layer 300 can be attached to the quarter-wave plate 240 through the second lower adhesive layer 60a, and the upper surface of the curl suppression layer 300 can be attached to the bottom surface of the first protective film 210 through the second upper adhesive layer 60b.

[0186] Figures 13 to 15 This is a schematic cross-sectional view illustrating a display device according to an exemplary embodiment.

[0187] Reference Figure 13 The curl suppression layer 300 can be disposed between the polarizing plate 200 and the display panel DP. The curl suppression layer 300 can directly prevent the curl generated by the polarizing plate 200 from propagating to the display panel DP.

[0188] In several embodiments, a TFE encapsulation layer may be disposed between the curl suppression layer 300 and the display panel DP. The curl suppression layer 300 can be attached to the display panel DP or the TFE encapsulation layer via a second adhesive layer 60.

[0189] The polarizing plate 200 can be attached to the curl suppression layer 300 via the first adhesive layer 50. In some embodiments, a window structure WS can be attached to the polarizing plate 200 via a third adhesive layer 70. In some embodiments, as shown in reference... Figure 5 Note that the window structure WS and the encapsulation layer TFE can also be omitted.

[0190] In one embodiment, the curl suppression layer 300 may be disposed on the touch sensor layer TS (see reference 1). Figure 3 Between the touch sensor layer TS and the polarizer 200. In one embodiment, the curl suppression layer 300 may be disposed between the touch sensor layer TS and the display panel DP.

[0191] Reference Figure 14 and Figure 15 The curl suppression layer 300 can be disposed below the display panel DP. Accordingly, the curl suppression layer 300 can suppress the upward curling caused by the polarizer 200 below the display panel DP. Furthermore, the high modulus characteristics of the curl suppression layer 300 can provide support for the upper structure including the display panel DP.

[0192] like Figure 14 As shown, in several embodiments, the curl suppression layer 300 may be disposed below the cover panel CP. For example, the curl suppression layer 300 may be attached to the bottom surface of the cover panel CP via a second adhesive layer 60.

[0193] like Figure 15 As shown, in several embodiments, the curl suppression layer 300 may be disposed between the display panel DP and the cover panel CP. For example, the curl suppression layer 300 and the cover panel CP may be attached to each other via a second lower adhesive layer 60a. The curl suppression layer 300 and the display panel DP may be attached to each other via a second upper adhesive layer 60b.

[0194] Figures 16 to 19 This is a schematic cross-sectional view illustrating a method of manufacturing a display device according to an exemplary embodiment.

[0195] Reference Figure 16 , as reference Figure 2The display panel DP is formed by forming a circuit layer CL and a pixel structure PXS on the base substrate 100.

[0196] In several embodiments, a packaging layer TFE, overlapping the circuit layer CL and the pixel structure PXS, may also be formed on the base substrate 100. For example... Figure 5 As shown, for ultra-thin displays, the TFE encapsulation layer can also be omitted.

[0197] Reference Figure 17 The polarizing plate 200 can be attached to the display panel DP or the encapsulation layer TFE using the first adhesive layer 50. (See reference...) Figure 6 The polarizer 200 may include a polarizer 220 having a stretching axis or an absorption axis in a first stretching direction. The polarizer 200 may be aligned with the display panel DP such that the first stretching direction of the polarizer 220 forms a first cross angle with the length direction of the display device.

[0198] Reference Figure 18 , as reference Figure 7 This explains that a curl suppression layer 300 having a predetermined stretch ratio and tensile modulus in the second stretching direction described above can be formed by heating and stretching UHMWPE. For example, the curl suppression layer 300 can be attached to the polarizing plate 200 using the second adhesive layer 60.

[0199] As described above, the polarizer 220 can be aligned in such a way that the first stretching direction of the polarizer 220 forms a second cross angle with the second stretching direction of the curl suppression layer 300.

[0200] Subsequently, the integrated circuit chip IC can be bonded or mounted on the peripheral area or non-pixel area of ​​the base substrate 100. For example, the flexible printed circuit board (FPC) and the integrated circuit chip IC can be electrically connected to each other by heating and extruding anisotropic conductive film (ACF).

[0201] Reference Figure 19 A window structure WS can be stacked on the curl suppression layer 300. For example, the window structure WS can be attached to the upper surface of the curl suppression layer 300 using the third adhesive layer 70.

[0202] In several embodiments, as referenced Figure 5 Note that the window structure WS can be omitted. Accordingly, the curl suppression layer 300 can essentially be set as a window of the display device.

[0203] Then, as per reference Figure 4 and Figure 5This indicates that the cover panel (CP) can be positioned below the display panel (DP). Then, the flexible printed circuit board (FPC) is bent, allowing the circuit structure (CS) and the FPC to be connected below the cover panel (CP).

[0204] exist Figures 16 to 19 The diagram shows the formation of the curl suppression layer 300 on the polarizing plate 200, but as shown in the reference... Figures 8 to 15 Note that the position of the curl suppression layer 300 can be changed. For example, the curl suppression layer 300 can be arranged together with the cover panel CP below the display panel DP.

[0205] Figure 20 and Figure 21 This is a schematic cross-sectional view illustrating a method of manufacturing a display device according to several embodiments. References will be omitted. Figures 16 to 19 The description is a detailed explanation of a process that is substantially the same or similar to the one described.

[0206] Reference Figure 20 The curl suppression layer 300 can be attached to the window structure WS via the third adhesive layer 70. Accordingly, the curl suppression layer 300 can be prepared as a substantially integrated component with the window structure WS before being combined with the display panel DP.

[0207] Reference Figure 21 The window structure WS, including the curl suppression layer 300, can be stacked on the polarizer 200 using the second adhesive layer 60.

[0208] The curl suppression layer 300 can prevent damage caused by impacts to the window structure WS (e.g., including the glass substrate) and can improve the stability of the lamination process of the display panel DP and the window structure WS.

[0209] Figure 22 This is a block diagram of an electronic device according to one embodiment.

[0210] Reference Figure 22 According to one embodiment, the electronic device 10 may include a display module 11, a processor 12, a memory 13, and a power module 14.

[0211] The processor 12 may include a central processing unit (CPU), an application processor (AP), a graphics processing unit (GPU), a communication processor (CP), an image signal processor (ISP), and / or a controller.

[0212] The memory 13 may store data information required for the operation of the processor 12 or the display module 11. If the processor 12 executes the application stored in the memory 13, the image data signal and / or input control signal may be transmitted to the display module 11, and the display module 11 may process the received signal and output image information through the display screen.

[0213] The power module 14 may include a power supply module such as a power adapter or battery device and a power conversion module that generates the power required for the operation of the electronic device 10 by converting the power supplied by the power supply module.

[0214] At least one of the various components of the electronic device 10 described above may be included within the display device according to the above embodiments. Furthermore, a portion of an individual module that is functionally included within a single module may also be included within the display device, while another portion may be disposed separately from the display device. For example, the display device may include a display module 11, and the processor 12, memory 13, and power module 14 may be configured as other non-display devices within the electronic device 10.

[0215] Figure 23 This is a schematic diagram of an electronic device according to various embodiments.

[0216] Reference Figure 23 Non-limiting examples of various electronic devices that utilize the display device according to the above embodiments may include image display electronic devices (smartphones 10_1a, tablet PCs 10_1b, laptop computers 10_1c, televisions (TVs) 10_1d, desktop displays 10_1e, etc.), wearable electronic devices including display modules (such as smart glasses 10_2a, head-mounted displays 10_2b, smartwatches 10_2c, etc.), and vehicle electronic devices 10_3 including display modules (such as vehicle dashboards, center consoles, central information displays (CIDs) arranged on the dashboard, room mirror displays, etc.). The electronic devices may also include virtual reality glasses or augmented reality glasses.

Claims

1. A display device, comprising: Display panel, including pixel structure; A polarizing plate is disposed on the display panel and includes a polarizer having a stretching axis in a first stretching direction parallel to the upper surface of the display panel. as well as A curl-inhibiting layer, disposed on or below the display panel, is stretched along a second stretching direction intersecting the first stretching direction, and comprises ultra-high molecular weight polyethylene.

2. The display device according to claim 1, wherein, The tensile modulus of the curl-inhibiting layer is between 70 GPa and 130 GPa.

3. The display device according to claim 1, wherein, The thickness of the curl suppression layer is greater than the thickness of the polarizer.

4. The display device according to claim 3, wherein, The polarizer has a thickness of 10 μm to 15 μm, and the curl-suppression layer has a thickness of 12 μm to 400 μm.

5. The display device according to claim 1, wherein, The first stretching direction forms a first intersection angle with the length direction of the display panel, the second stretching direction is parallel to the upper surface of the display panel, and the second stretching direction forms a second intersection angle with the first stretching direction.

6. The display device according to claim 5, wherein, The first intersection angle is 20° to 70°.

7. The display device according to claim 1, wherein, The polarizing plate and the curl suppression layer are stacked sequentially from the upper surface of the display panel.

8. The display device according to claim 1, wherein, The curl suppression layer is disposed between the display panel and the polarizing plate.

9. The display device according to claim 1, further comprising: A cover panel is positioned below the display panel. The curl suppression layer is disposed below the cover panel or between the display panel and the cover panel.

10. An electronic device comprising: The display device according to any one of claims 1 to 9; Memory; as well as The processor controls the operation of the display device by executing data included in the memory.

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