Display device

Abstract

According to one embodiment of the utility model, the display device comprises a display panel; a coating layer disposed below the display panel; and a protective layer disposed below the coating layer, the coating layer comprising: a first base layer comprising an organic material and having a viscosity of 1000 cps or more; and a plurality of first fillers dispersed in the first underlayer, the protective layer is composed of any one of a metal, a metal oxide, and a conductive polymer, and the pencil hardness of the lower surface of the protective layer is H or more. Therefore, the thickness of the display device can be reduced, and the scratch resistance can be improved.

Description

Technical Field

[0001] The utility model relates to a display device, and more particularly to a display device comprising a lower part of a display panel with improved reliability. Background Art

[0002] Various display devices are being developed for use in multimedia devices such as televisions, mobile phones, tablet computers, game consoles, etc. The display device may include various functional layers in order to provide users with excellent quality color images.

[0003] On the other hand, recently, research on thin display devices is being conducted to realize various forms of display devices including curved display devices, rollable display devices, foldable display devices, etc. On the other hand, the number of functional layers can be reduced, including functional layers containing various functions, to realize a thin display device.

[0004] On the other hand, when realizing a thin display device, it is necessary to ensure the impact resistance of the display device. Therefore, research on the structure of a display device with excellent impact resistance and scratch resistance is being conducted. Utility Model Content

[0005] The utility model aims to provide a display device with improved scratch resistance by configuring a coating as a lower part of a display panel.

[0006] A display device according to an embodiment of the present invention includes: a display panel; a coating layer disposed below the display panel; and a protective layer disposed below the coating layer, wherein the coating layer includes: a first base layer composed of an organic substance and having a viscosity of more than 1000 cps; and a plurality of first fillers dispersed in the first base layer, wherein the protective layer is composed of any one of a metal, a metal oxide, and a conductive polymer, and the pencil hardness below the protective layer is greater than H.

[0007] It can be that the pencil hardness under the protective layer is greater than the pencil hardness under the coating layer

[0008] It can be that the specific resistance of the protective layer is 1×10 -4 Ω.cm or less.

[0009] The first fillers may have an average diameter of 5 μm or more and 70 μm or less.

[0010] The coating layer may have a thickness of 30 μm or more and 200 μm or less, and the protective layer may have a thickness of 10 μm or more and 20 μm or less.

[0011] It may be that the coating layer is directly disposed under the display panel, and the protective layer is directly disposed under the coating layer.

[0012] It may be that the display device according to an embodiment of the present invention further includes: a circuit substrate electrically connected to the display panel, and the protection layer is in contact with at least a portion of the circuit substrate.

[0013] The protective layer may include: an adhesive layer disposed below the first base layer; and a protective film disposed below the adhesive layer, wherein the protective film is made of any one of metal, metal oxide and conductive polymer.

[0014] The protective film may be made of any one of titanium oxide, zinc oxide, tin oxide, carbon nanotubes, graphene, gold, silver, copper, and aluminum.

[0015] The protective layer may include: a second base layer disposed below the first base layer; and a plurality of second fillers dispersed in the second base layer, each of the plurality of second fillers being composed of any one of metal, metal oxide and conductive polymer.

[0016] It may be that an average diameter of the plurality of second fillers is smaller than an average diameter of the plurality of first fillers.

[0017] The second fillers may have an average diameter of 0.1 μm or more and 5 μm or less.

[0018] The second base layer may be a photocurable resin, and the second base layer may be any one of a silicone resin, an acrylic resin, and an epoxy resin.

[0019] Each of the plurality of second fillers may be made of silver (Ag) or graphene.

[0020] The material of the first base layer may be different from the material of the second base layer.

[0021] The material of each of the plurality of first fillers may be different from the material of each of the plurality of second fillers.

[0022] It may be that a ratio of the mass of the plurality of second fillers to the mass of the second base layer is smaller than a ratio of the mass of the plurality of first fillers to the mass of the first base layer.

[0023] According to one embodiment of the present invention, a display device includes: a display panel; and a lower component, which is arranged below the display panel, and the lower component includes: a coating, which is arranged below the display panel and includes a first base layer and a plurality of first fillers dispersed in the first base layer; and a protective layer, which is arranged below the coating and includes a second base layer and a plurality of second fillers dispersed in the second base layer, the ratio of the mass of the plurality of second fillers to the overall mass of the protective layer is smaller than the ratio of the mass of the plurality of first fillers to the overall mass of the coating, and the average diameter of the plurality of first fillers is larger than the average diameter of the plurality of second fillers.

[0024] The bottom surface of the lower member may be defined as the bottom surface of the protective layer.

[0025] The display device according to the utility model can reduce the thickness of the display device by including a coating layer under the display panel and simplifying multiple functional components. One embodiment can include a protective layer under the coating layer to improve the scratch resistance under the display device, thereby providing a display device with improved reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of a display device according to an embodiment of the utility model.

[0027] Figure 2 It is an exploded perspective view of a display device according to an embodiment of the utility model.

[0028] Figure 3 is a cross-sectional view of a display device according to an embodiment of the present utility model.

[0029] Figure 4 is a cross-sectional view of a display panel according to an embodiment of the present utility model.

[0030] Figure 5 It is a cross-sectional view of a display module according to an embodiment of the present invention.

[0031] Figure 6 It is a cross-sectional view of the lower part according to one embodiment of the utility model.

[0032] Figure 7a as well as Figure 7b is a cross-sectional view of a display module according to another embodiment of the present invention.

[0033] Figure 8 It is a cross-sectional view of a lower component according to another embodiment of the utility model.

[0034] Figures 9a to 9dIt is a cross-sectional view of some steps in a method for manufacturing a display device according to an embodiment of the present invention.

[0035] Fig.10a as well as Fig.10b It is a cross-sectional view of some steps in a method for manufacturing a display device according to another embodiment of the present invention.

[0036] (Explanation of Reference Numerals)

[0037] DD: Display device DP: Display panel

[0038] LM: Lower part CM: Coating

[0039] PL: Protective layer BS: First base layer

[0040] PF: Protective film M_AP: Adhesive layer

[0041] BR: Second base layer FP1: First filler

[0042] FP2: Second filler DETAILED DESCRIPTION

[0043] In this specification, when any constituent element (or region, layer, part, etc.) is mentioned as being "on" other constituent elements, "connected" or "combined with" other constituent elements, it means that it can be directly configured / connected / combined with other constituent elements or a third constituent element can be configured between them.

[0044] On the other hand, in the present application, "direct configuration" may mean that there is no additional layer, film, region, plate, etc. between a layer, film, region, plate, etc. and other parts. For example, "direct configuration" may mean that no additional component such as an adhesive component is used between two layers or two components and they are configured.

[0045] The same reference numerals refer to the same components. In addition, in the drawings, the thickness, proportion and size of the components are exaggerated for the effective description of the technical content. "And / or" includes all combinations of more than one possible definition of the associated structure.

[0046] The terms first, second, etc. may be used to describe various constituent elements, but the constituent elements cannot be limited by the above terms. The above terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, without departing from the scope of the invention, the first constituent element may be named as the second constituent element, and similarly the second constituent element may also be named as the first constituent element. Unless the context clearly indicates otherwise, the expression in the singular includes the expression in the plural.

[0047] In addition, the terms such as “below”, “lower side”, “above”, and “upper side” are used to explain the relationship between the structures shown in the drawings. The above terms are relative concepts and are explained based on the directions shown in the drawings.

[0048] The terms "including" or "having" should be understood as specifying the existence of the features, numbers, steps, tasks, constituent elements, accessories or these combinations recorded in the specification, and do not preclude the existence or additional possibility of one or more other features or numbers, steps, tasks, constituent elements, accessories or these combinations.

[0049] Unless defined differently, all terms (including technical terms and scientific terms) used in this specification have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. In addition, terms that may be the same as those defined in commonly used dictionaries should be interpreted as having the same meanings as those in the context of the associated technology, and not interpreted as highly idealized or overly formal meanings, unless expressly defined herein.

[0050] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0051] Figure 1 It is a three-dimensional diagram of a display device DD according to an embodiment of the present invention. Figure 2 It is an exploded perspective view of a display device DD according to an embodiment of the present invention.

[0052] exist Figure 1 2 shows that the display device DD is a mobile phone. However, the display device DD is not limited thereto, and may also be a small or medium-sized display device such as a tablet, a car navigation system, a game console, a wearable device, or a camera.

[0053] The display device DD may display an image IM through the active area AA-DD. The active area AA-DD may include a plane defined by the first direction DR1 and the second direction DR2. The active area AA-DD may also include a curved surface bent from at least one side of the plane defined by the first direction DR1 and the second direction DR2. Figure 1 The display device DD of the embodiment shown in the figure includes two curved surfaces that are bent from two sides of a plane defined by the first direction DR1 and the second direction DR2. However, the shape of the active area AA-DD is not limited thereto. For example, the active area AA-DD may also include only the plane, or the active area AA-DD may also include four curved surfaces that are bent from two or more (e.g., four) sides of the plane.

[0054] On the other hand, Figure 1The following drawings show a first direction DR1 to a third direction DR3 , and the directions indicated by the first to third directions DR1 , DR2 , and DR3 described in this specification may be relative concepts and may be transformed into other directions.

[0055] In the present specification, the first direction DR1 and the second direction DR2 may be orthogonal to each other, and the third direction DR3 may be a normal direction relative to a plane defined by the first direction DR1 and the second direction DR2. On the other hand, the meaning of "on a plane" in the present specification may mean that when viewed on a plane defined by the first direction DR1 and the second direction DR2, the thickness direction may mean the third direction DR3 which is a normal direction relative to the plane defined by the first direction DR1 and the second direction DR2.

[0056] The display device DD may include an active area AA-DD and a peripheral area NAA-DD adjacent to the active area AA-DD. The active area AA-DD may correspond to a display area AA of a display panel DP described later, and the peripheral area NAA-DD is a portion corresponding to a non-display area NAA of the display panel DP.

[0057] The peripheral area NAA-DD is an area that blocks light signals, and may be an area disposed outside the active area AA-DD and surrounding the active area AA-DD. In one embodiment, the peripheral area NAA-DD may be disposed on the side of the display device DD instead of the front. In one embodiment, the peripheral area NAA-DD may be omitted.

[0058] The display device DD of an embodiment may include a window WM, a housing HU, a display module DM, a circuit substrate DC, and an upper member UM.

[0059] The display device DD of an embodiment may include a window WM configured on the display panel DP. The window WM provides the outside of the display device DD. Although not shown in the figure, the window WM may include a base substrate and functional layers such as a reflection prevention layer, a fingerprint prevention layer, and an optical layer for controlling a phase.

[0060] In the display device DD of one embodiment, the upper part UM can be configured on the lower side of the window WM and the upper side of the display module DM. The upper part UM can include a reflection prevention layer and an input sensing sensor. The reflection prevention layer reduces the reflectivity of external light. The input sensing sensor senses the external input of the user. The upper part UM can also include an adhesive layer that combines the reflection prevention layer and the input sensing sensor.

[0061] In the display device DD of one embodiment, the display module DM may be disposed at the lower side of the upper part UM. The display module DM may include a display panel DP and a lower part LM.

[0062] The display panel DP may include a display area AA displaying an image IM and a non-display area NAA adjacent to the display area AA. That is, the front of the display panel DP may include the display area AA and the non-display area NAA. The display area AA may be an area activated according to an electrical signal.

[0063] The non-display area NAA may be adjacent to the display area AA. The non-display area NAA may surround the display area AA. A driving circuit or driving wiring for driving the display area AA, various signal lines or pads or electronic components for providing electrical signals to the display area AA, etc. may be configured in the non-display area NAA.

[0064] The display panel DP may include a light emitting element layer DP-ED including an organic light emitting element, a quantum dot light emitting element, a micro LED light emitting element, a nano LED light emitting element, etc. (refer to Figure 4 ). Light emitting element layer DP-ED (refer to Figure 4 ) can be a structure that essentially generates an image.

[0065] The display device DD may include a circuit substrate DC connected to the display panel DP. The circuit substrate DC may include a flexible substrate CF and a main substrate MB. The flexible substrate CF may include an insulating film and a conductive wiring mounted on the insulating film. The conductive wiring is connected to the pad PD to electrically connect the circuit substrate DC and the display panel DP. On the other hand, in one embodiment, the flexible substrate CF may also be omitted, and in this case the main substrate MB may also be directly connected to the display panel DP.

[0066] The main substrate MB may include signal lines and electronic components not shown. The electronic components may be connected to the signal lines and electrically connected to the display panel DP. The electronic components generate various electrical signals (e.g., signals for generating an image IM or signals for sensing external input) or process sensed signals. On the other hand, the main substrate MB may also be provided with a plurality of signals corresponding to each electrical signal for generation and processing, without limitation to any one embodiment.

[0067] The lower member LM may be disposed under the display panel DP. The lower member LM may be a member that supports the display panel DP and performs a heat dissipation function of dissipating heat generated from the display panel DP. Figure 5 The following will be described later.

[0068] The display device DD of one embodiment may include a housing HU disposed at the lower side of the lower member LM. The housing HU may contain a display panel DP, etc. In the display device DD according to one embodiment, the window WM and the housing HU may be combined to form the appearance of the display device DD.

[0069] Figure 33 is a cross-sectional view showing a partial structure of a display device DD according to an embodiment of the present invention.

[0070] Reference Figure 3 According to an embodiment of the present invention, the display device DD may include a window WM, an upper part UM, a display panel DP, a circuit substrate DC and a lower part LM.

[0071] In one embodiment, the window WM may cover the front of the display panel DP. The window WM may include a base substrate WM-BS and a frame pattern WM-BZ. The base substrate WM-BS includes a transparent first base layer such as a glass substrate or a transparent film. The frame pattern WM-BZ may have a multi-layer structure. The multi-layer structure may include a colored color layer and a black light-shielding layer. The colored color layer and the black light-shielding layer may be formed by evaporation, printing, and coating processes. The frame pattern WM-BZ may also be omitted from the window WM and formed on the upper part UM that is not the base substrate WM-BS.

[0072] In one embodiment, the upper member UM includes an anti-reflection layer UM- 1 and an input sensor UM- 2 .

[0073] The reflection prevention layer UM-1 may reduce the external light reflectivity. The reflection prevention layer UM-1 may include a phase retarder and / or a polarizer. The reflection prevention layer UM-1 may include a polarizing film or a color filter. The color filter may have a predetermined arrangement. The color filter may be arranged in consideration of the luminous color of the pixels included in the display panel DP. The reflection prevention layer UM-1 may also include a segmentation layer adjacent to the color filter.

[0074] The input sensor UM-2 may include a plurality of sensing electrodes (not shown) for sensing external input, transmission lines (not shown) connected to the plurality of sensing electrodes, and an inorganic layer and / or an organic layer for insulating / protecting the plurality of sensing electrodes or the transmission lines. The input sensor UM-2 may be a capacitive sensor, but is not particularly limited.

[0075] The input sensor UM-2 can be directly formed on the display panel DP through a continuous process during the manufacture of the display panel DP. Figure 4 However, not limited thereto, the input sensor UM-2 may also be manufactured as a panel separate from the display panel DP, thereby being attached to the display panel DP through an adhesive layer.

[0076] and Figure 3Differently as shown, an adhesive layer may be further configured between the window WM and the anti-reflection layer UM-1, and an adhesive layer may be further configured between the anti-reflection layer UM-1 and the input sensor UM-2. The window, the anti-reflection layer UM-1 and the input sensor UM-2 may be bonded by adhesive layers, respectively.

[0077] In one embodiment, the circuit substrate DC may include a flexible substrate CF and a main substrate MB. The flexible substrate CF of one embodiment may be assembled in a bent state. Thus, the main substrate MB may be disposed on the back of the display panel DP and stably accommodated in the housing HU (see Figure 2 For example, the flexible substrate CF may be bent toward the back side of the display panel DP and configured to the lower side of the lower part LM.

[0078] In one embodiment, the lower part LM may include a coating layer CM and a protective layer PL. The coating layer CM is disposed below the display panel DP, and the protective layer PL is disposed below the coating layer CM. The protective layer PL may be in contact with the circuit substrate DC. In one embodiment, the flexible substrate CF may be assembled in a bent state, and the protective layer PL may be in contact with the main substrate MB. As described later, since the protective layer PL has a predetermined conductivity, the circuit substrate DC and the display panel DP may be electrically connected even if the protective layer PL is disposed between the display panel DP and the circuit substrate DC. A detailed description of the lower part LM is provided below. Figure 5 In the description.

[0079] Figure 4 is a cross-sectional view of a display panel DP according to an embodiment of the present invention.

[0080] In one embodiment, the display panel DP includes a base substrate BL, a circuit layer DP-CL, a light emitting element layer DP-ED, and an encapsulation layer ENL disposed on the base substrate BL. The base substrate BL may include a plastic substrate, a glass substrate, a metal substrate, or an organic / inorganic composite material substrate, etc. For example, the base substrate BL may include at least one polyimide layer.

[0081] The circuit layer DP-CL includes at least one insulating layer, a semiconductor pattern and a conductive pattern. The insulating layer includes at least one inorganic layer and at least one organic layer. The semiconductor pattern and the conductive pattern can constitute a signal line, a pixel driving circuit and a scanning driving circuit. In addition, the circuit layer DP-CL may include a back metal layer.

[0082] The light emitting element layer DP-ED includes a display element, such as a light emitting element. For example, the light emitting element may be an organic light emitting element, a quantum dot light emitting element, a micro LED light emitting element or a nano LED light emitting element. The light emitting element layer DP-ED may also include an organic layer such as a pixel defining film.

[0083] The light emitting element layer DP-ED may be disposed in the display area AA. Alternatively, the non-display area NAA may be disposed at the periphery of the display area AA and surround the display area AA, and no light emitting element may be disposed in the non-display area NAA.

[0084] The encapsulation layer ENL may be disposed on the light emitting element layer DP-ED to cover the light emitting element layer DP-ED. The encapsulation layer ENL may be disposed on the circuit layer DP-CL to seal the light emitting element layer DP-ED. The encapsulation layer ENL may also be a thin film encapsulation layer including a plurality of organic thin films and inorganic thin films. The encapsulation layer ENL may also include a thin film encapsulation layer including a stacked structure of an inorganic layer / organic layer / inorganic layer. The stacked structure of the encapsulation layer ENL is not particularly limited.

[0085] Figure 5 FIG. 4 is a cross-sectional view showing in detail a display module DM which is a part of the structure of the display device. Figure 6 This is equivalent to a cross-sectional view showing in detail the lower member LM included in the display module DM.

[0086] Reference Figure 5 as well as Figure 6 According to an embodiment of the present invention, the display module DM may include a display panel DP and a lower part LM disposed below the display panel DP. The display module DM may be composed of the display panel DP and the lower part LM. The lower part LM may be disposed directly below the display panel DP.

[0087] The lower part LM includes a coating CM and a protective layer PL arranged below the coating CM. The lower part LM may consist only of the coating CM and the protective layer PL arranged below the coating CM. In a display device according to an embodiment of the utility model, only the coating CM and the protective layer PL may be arranged below the display panel DP. The bottom of the lower part LM may be defined as the bottom of the protective layer PL. That is, the bottom of the display module DM may be defined as the bottom of the protective layer PL. Thus, the thickness of the display device according to an embodiment is reduced, the accessories are simplified, and the process efficiency can be increased when the display device according to an embodiment is manufactured.

[0088] The coating layer CM may be directly disposed under the display panel DP. The coating layer CM includes a first base layer BS1 and a plurality of first fillers FP1 dispersed in the first base layer BS1. The coating layer CM may be a single layer composed of the first base layer BS1 and the plurality of first fillers FP1. The plurality of first fillers FP1 may be fillers dispersed in the first base layer BS1.

[0089] The coating CM can perform multiple functions in the electronic device according to the first base layer BS1 and the plurality of first fillers FP1. For example, the coating CM can support the display panel DP. The coating CM can protect the display panel DP and the like from physical impacts applied from the outside of the display device DD. The coating CM can perform a heat dissipation function of dissipating heat generated from the display panel DP and the like. The coating CM can also have functions such as electromagnetic wave shielding. However, it is not limited thereto, and according to the thickness, material and other characteristics of the coating CM, the coating CM can also perform other functions additionally in the display device DD.

[0090] The thickness d2 of the coating layer CM may be greater than or equal to 30 μm and less than or equal to 300 μm. For example, the thickness d2 of the coating layer CM may be greater than or equal to 30 μm and less than or equal to 200 μm. The viscosity of the coating layer CM may be greater than or equal to 1000 cps and less than or equal to 100000 cps. For example, the viscosity of the coating layer CM may be greater than or equal to 1000 cps and less than or equal to 20000 cps. Thus, the coating layer CM may support the display panel DP, etc. in the display device.

[0091] The first base layer BS1 may be a layer providing a base material in which a plurality of first fillers FP1 are dispersed. The first base layer BS1 may include an organic material. The first base layer BS1 may include at least one of acrylic polymer, urethane polymer, silicon polymer, and imide polymer. The first base layer BS1 may include a material having a predetermined strength.

[0092] Each of the plurality of first fillers FP1 may contain an organic substance or an inorganic substance. For example, each of the plurality of first fillers FP1 may contain graphite or metal particles. Each of the plurality of first fillers FP1 may contain the same substance, or may contain substances different from each other. Thus, the coating CM may perform multiple functions such as heat dissipation and shielding of the display device.

[0093] The average diameter d1 of the plurality of first fillers FP1 may be greater than or equal to 1 μm and less than or equal to 70 μm. For example, the average diameter d1 of the plurality of first fillers FP1 may be greater than or equal to 5 μm and less than or equal to 70 μm. Figure 6 In FIG. 1 , it is exemplarily shown that the first filler FP1 has the same diameter, but is not limited thereto, and the first filler FP1 may have a polydisperse distribution obtained by mixing a plurality of particles having substantially a monodisperse size distribution or a monodisperse distribution.

[0094] The plurality of first fillers FP1 may have a content of 30 wt % or more and 80 wt % or less compared to the entire substance included in the coating CM. For example, the plurality of first fillers FP1 may have a content of 50 wt % or more and 80 wt % or less compared to the entire substance included in the coating CM.

[0095] The protective layer PL is disposed below the coating layer CM. The protective layer PL may be disposed directly below the coating layer CM. The protective layer PL may include any one of a metal, a metal oxide, and a conductive polymer. For example, the protective layer PL may include any one of titanium oxide, zinc oxide, tin oxide, carbon nanotubes, graphene, gold, silver, copper, and aluminum. Thus, the protective layer PL may have a predetermined conductivity and may perform the functions of electromagnetic wave shielding and heat dissipation.

[0096] The thickness d3 of the protective layer PL may be thinner than the thickness d2 of the coating layer CM. The thickness of the protective layer PL may be 5 μm or more and 30 μm or less. For example, the thickness of the protective layer PL may be 10 μm or more and 20 μm or less.

[0097] The pencil hardness of the bottom of the protective layer PL is H or above. On the other hand, in this specification, the pencil hardness may refer to the pencil hardness measured according to ASTMD3363 with a test product standard pencil lead installed at a 45° slope, a pencil load of 1000g and a pencil moving speed of 60mm / min. For example, the pencil hardness of the bottom of the protective layer PL may be above H and below 9H. By having a pencil hardness property of H or above on the bottom of the protective layer PL according to one embodiment, the scratch resistance of the coating CM arranged above the protective layer PL can be improved. The pencil hardness of the bottom of the protective layer PL may be higher than the pencil hardness of the bottom of the coating CM. According to the relatively high hardness property of the bottom of the protective layer PL compared to the bottom of the coating CM, the protective layer PL may perform the function of protecting the coating CM. The protective layer PL may protect the coating CM from external impacts and scratches generated during the manufacture of the display device according to one embodiment of the utility model.

[0098] The specific resistance of the protective layer PL can be 1×10 -4 Ω.cm or less. For example, the specific resistance of the protective layer PL in one embodiment may be 1×10 -6 Ω.cm or more and 1×10 -4 Ω.cm or less. Thus, the protective layer PL according to an embodiment can have a predetermined conductivity, so that even on the circuit substrate DC (refer to Figure 3 ) and display panel DP (refer to Figure 3 ) is provided with a protective layer PL, and a circuit substrate DC (refer to Figure 3 ) and display panel DP (refer to Figure 3 ) are also electrically connected.

[0099] According to a display device according to an embodiment of the present invention, the thickness of the display device can be reduced and the accessories can be simplified by including a single coating layer that performs multiple functions under the display panel. The display panel produces multiple side effects by including a light-emitting element. In order to compensate for this, the display device of the prior art includes multiple components such as a shielding layer, a heat dissipation layer, a buffer layer, and a supporting layer under the display panel. In contrast, the present invention can obtain the effects of reduced thickness, simplified accessories, and increased manufacturing process efficiency by configuring a coating layer including multiple first fillers that perform the functions, while performing the functions performed by multiple layers of the prior art. In addition, according to a display device according to an embodiment of the present invention, a protective layer with high hardness characteristics can be configured under the coating, and the impact resistance and scratch resistance of the coating and the display panel can be increased. In addition, since the protective layer has a predetermined conductivity, the electrical connectivity of the display panel and the circuit substrate can be maintained even if the protective layer is included in the lower part of the display panel. Therefore, the display device according to an embodiment of the present invention can provide a display device with improved reliability for the impact resistance and scratch resistance of the display panel, etc. by including a coating layer and a protective layer.

[0100] Figure 7a as well as Figure 7b Detailed cross-sectional views of display modules DM-1 and DM-2 according to another embodiment of the present invention are shown. Figure 8 Detailed cross-sectional view of the lower part LM-2 according to one embodiment of the present invention. Figure 7a The lower part LM-1 of one embodiment includes a protective film PF. Figure 7b The lower member LM-2 according to one embodiment includes a second base layer BS2 and a plurality of second fillers FP2.

[0101] Reference Figure 7a According to an embodiment of the present invention, the display module DM-1 may include a display panel DP and a lower part LM-1 disposed below the display panel DP. It may be that the lower part LM-1 of an embodiment includes a coating CM and a protective layer PL-1, and the protective layer PL-1 includes an adhesive layer M_AP and a protective film PF. It may be that the lower part LM-1 of an embodiment is composed of a coating CM, an adhesive layer M_AP and a protective film PF, and the bottom of the display module DM-1 is defined as the bottom of the protective film PF.

[0102] The adhesive layer M_AP may be disposed below the coating layer CM. The adhesive layer M_AP may be disposed directly below the coating layer CM. The adhesive layer M_AP may connect the coating layer CM and the protective film PF. The adhesive layer M_AP may include a pressure sensitive adhesive film (PSA) or an adhesive resin layer.

[0103] The protective film PF may be disposed below the adhesive layer M_AP. The protective film PF may be disposed directly below the adhesive layer M_AP. The protective film PF may include any one of a metal, a metal oxide, and a conductive polymer. The protective film PF may include any one of titanium oxide, zinc oxide, tin oxide, carbon nanotubes, graphene, gold, silver, copper, and aluminum. For example, the protective film PF may include an indium tin oxide (ITO) film.

[0104] Reference Figure 7b According to an embodiment of the present invention, the display module DM-2 may include a display panel DP and a lower part LM-2 disposed below the display panel DP. The lower part LM-2 of an embodiment may include a coating layer CM and a protective layer PL-2, and the protective layer PL-2 includes a second base layer BS2 and a plurality of second fillers FP2.

[0105] Reference Figure 7b as well as Figure 8 , the protective layer PL-2 may include a second base layer BS2 disposed below the coating layer CM. The second base layer BS2 may be disposed directly below the coating layer CM. The second base layer BS2 may be a layer providing a base material in which a plurality of second fillers FP2 are dispersed. The second base layer BS2 may include an organic substance. The second base layer BS2 may include a curing resin. For example, the second base layer BS2 may be a photocurable resin. The second base layer BS2 may be formed by ultraviolet polymerization and curing. The second base layer BS2 may include at least one of an acrylic polymer, a urethane polymer, a silicon polymer, and an imide polymer. For example, the second base layer BS2 may be any one of a silicon resin, an acrylic resin, and an epoxy resin.

[0106] The protective layer PL-2 may include a plurality of second fillers FP2 dispersed in the second base layer BS2. Each of the plurality of second fillers FP2 may contain any one of a metal, a metal oxide, and a conductive polymer. For example, each of the plurality of second fillers FP2 may contain silver (Ag) or graphene. Each of the plurality of second fillers FP2 may contain the same substance, or may contain substances different from each other.

[0107] The average diameter of the second fillers FP2 may be greater than or equal to 0.1 μm and less than or equal to 10 μm. For example, the average diameter of the second fillers FP2 may be greater than or equal to 1 μm and less than or equal to 5 μm. Figure 8 exemplarily shows that the second filler FP2 has the same diameter, but is not limited thereto, and the second filler FP2 may have a polydisperse distribution obtained by mixing a plurality of particles having substantially a monodisperse size distribution or a monodisperse distribution.

[0108] The second fillers FP2 may have a content of 10 wt % to 50 wt % inclusive of the protective layer PL-2. For example, the second fillers FP2 may have a content of 20 wt % to 40 wt % inclusive of the protective layer PL-2.

[0109] The ratio of the content of the plurality of first fillers FP1 relative to the entire substance contained in the coating layer CM is higher than the ratio of the content of the plurality of second fillers FP2 relative to the entire substance contained in the protective layer PL-2. The average diameter d4 of the plurality of second fillers FP2 in the protective layer PL-2 may be smaller than the average diameter d1 of the plurality of first fillers FP1 in the coating layer CM. Thus, when the display device according to an embodiment is manufactured, even if a predetermined friction occurs under the protective layer PL-2, the degree of squeezing of the second filler FP2 by friction may be reduced.

[0110] When a display device including a lower part is manufactured, the lower side of the coating may cause at least a portion of the first fillers to be squeezed or adhered to other parts due to a predetermined pressure or friction. However, according to a display device of one embodiment of the utility model, a protective layer is arranged below the coating, and the content of the second fillers is lower than the content of the first fillers relative to the overall substance contained in the protective layer. The ratio of the content of the first fillers to the overall substance contained in the coating can prevent the squeezing phenomenon below due to friction, and the scratch resistance can be improved. Thus, one embodiment can provide a display device with improved reliability.

[0111] In one embodiment, the substance contained in the protective layer PL-2 may be different from the substance contained in the coating CM. The substance contained in the second base layer BS2 of the protective layer PL-2 may be different from the substance contained in the first base layer BS1 of the coating CM. The substance contained in the second filler FP2 of the protective layer PL-2 may be different from the substance contained in the first filler FP1 of the coating CM. However, in another embodiment, as required, the substance contained in the protective layer PL-2 may be the same as the substance contained in the coating CM. It is also possible that the substance contained in the second base layer BS2 of the protective layer PL-2 is the same as the substance contained in the first base layer BS1 of the coating CM, and the substance contained in the second filler FP2 of the protective layer PL-2 is the same as the substance contained in the first filler FP1 of the coating CM. That is, it is also possible that the ratio of the content of the second filler FP2 relative to the plurality of protective layers PL and the ratio of the content of the first filler FP1 relative to the coating CM are different, but each of the substances contained in the protective layer PL-2 and the substances contained in the coating CM are the same.

[0112] The following describes a method for manufacturing a display device according to an embodiment with reference to the accompanying drawings. Figures 1 to 8 The features of the display device described in will not be described again, and the description will focus on the features of the method for manufacturing the display device.

[0113] Figures 9a to 9d It is a cross-sectional view of some steps in a method for manufacturing a display device according to an embodiment of the present invention. Fig.10a as well as Fig.10b It is a cross-sectional view of some steps in a method for manufacturing a display device according to another embodiment of the present invention.

[0114] Reference Figure 9a According to an embodiment of the present invention, the method for manufacturing a display device may include providing a display panel DP and a coating layer CM disposed under the display panel DP. The coating layer CM may be provided in the form of a first base layer BS1 and a plurality of first fillers FP1 dispersed in the first base layer BS1.

[0115] Reference Figure 9b as well as Fig.9cAccording to an embodiment of the present invention, a method for manufacturing a display device may include the step of forming a preliminary protective film P_PF under the coating CM. The preliminary protective film P_PF of one embodiment may include an adhesive layer M_AP, a protective film PF, a lower adhesive layer AAL, and a lower protective film LPF. The lower protective film LPF may be formed under the protective film PF through the lower adhesive layer AAL. The lower protective film LPF may include a non-conductive substance. For example, the lower protective film LPF may include polyethylene terephthalate (PET). When a display device according to an embodiment of the present invention is manufactured, the scratch resistance under the coating CM may be further improved by further including a lower protective film LPF at the lowermost end of the coating CM.

[0116] Reference Figure 9b , the length of the lower protection film LPF in the first direction DR1 may be the same as the length of the protection film PF in the first direction DR1, referring to Fig.9c , the length of the lower protection film LPF in the first direction DR1 may be longer than the length of the protection film PF in the first direction DR1. Fig.9c As shown, in the case where the length of the lower protection film LPF in the first direction DR1 is relatively longer than that of the protection film PF, the scratch resistance of the protection film PF and the coating layer CM may be improved.

[0117] Reference Figure 9b to Figure 9d According to an embodiment of the present invention, the method for manufacturing a display device may include the step of removing the lower protective film LPF from under the protective film PF. Thus, the display module DM (refer to Figure 5 ). In order to remove the lower protective film LPF from under the protective film PF, the lower adhesive layer AAL may have a weak adhesive force. The lower adhesive layer AAL connecting the lower protective film LPF and the protective film PF may have a relatively low adhesive force compared to the adhesive layer M_AP connecting the protective film PF and the coating layer CM. When a display device according to an embodiment of the present invention is manufactured, the removal of the lower protective film LPF may become easy according to the provision of the lower adhesive layer AAL.

[0118] Reference Fig.10a According to another embodiment of the present invention, the method for manufacturing a display device may include forming a preliminary protective layer P_PL under the coating layer CM. The preliminary protective layer P_PL may include a preliminary base layer P_BS and a plurality of second fillers FP2.

[0119] The step of forming the preliminary protective layer P_PL can be performed by a coating process. The step of forming the preliminary protective layer P_PL can be performed by at least any one of a spin coating method, a slit coating method, a jet printing method, a metal mask printing method, and a screen printing method. For example, the step of forming the preliminary protective layer P_PL can be performed by a metal mask printing method or a screen printing method. Thus, even if the preliminary protective layer P_PL has physical properties such as thickness and viscosity in the aforementioned numerical range, the preliminary protective layer P_PL can also be attached to the bottom of the coating CM.

[0120] Reference Fig.10a as well as Fig.10b , after the step of forming the preliminary protective layer P_PL, the step of forming the protective layer PL may be included. The step of forming the protective layer PL may include the step of photocuring or thermally curing the preliminary protective layer P_PL. The preliminary protective layer P_PL may contain a curing resin. The preliminary base layer P_BS may be composed of a curing resin. The step of forming the protective layer PL may include the step of photocuring by irradiating light LR below the preliminary protective layer P_PL. The protective layer PL may be formed by curing the preliminary protective layer P_PL with light LR. In one embodiment, the light LR may refer to ultraviolet rays.

[0121] The above description is made with reference to the preferred embodiments of the utility model, but a person skilled in the art or a person with general knowledge in the technical field will understand that various modifications and changes can be made to the utility model without departing from the concept of the utility model and the scope of the technical field recorded in the attached claims. Therefore, the technical scope of the utility model is not limited by the contents recorded in the detailed description of the specification, but should only be determined by the claims.

Claims

1. A display device, characterized in that: include: Display panel; A coating layer, disposed below the display panel; as well as A protective layer is disposed below the coating layer, The protective layer is composed of any one of metal, metal oxide and conductive polymer, and the pencil hardness of the bottom surface of the protective layer is H or higher.

2. The display device according to claim 1, characterized in that The pencil hardness under the protective layer is greater than the pencil hardness under the coating layer.

3. The display device according to claim 1, characterized in that The specific resistance of the protective layer is 1×10 -4 Ω.cm or less.

4. The display device according to claim 1, characterized in that The thickness of the coating is 30 μm or more and 200 μm or less, The protective layer has a thickness of 10 μm or more and 20 μm or less.

5. The display device according to claim 1, characterized in that The display device further includes: a circuit substrate, electrically connected to the display panel, The protective layer is in contact with at least a portion of the circuit substrate.

6. The display device according to claim 1, characterized in that: The protective layer comprises: an adhesive layer disposed below the coating layer; and A protective film is disposed below the adhesive layer. The protective film is made of any one of metal, metal oxide and conductive polymer.

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