Micro-led module, display device including same, and method for manufacturing display device

Abstract

The present invention relates to a micro-LED module, a display device including same, and a manufacturing process for the display device. The micro-LED module according to an embodiment includes: a substrate; a semiconductor light-emitting device electrically connected to the substrate; and a first coating layer disposed on the semiconductor light-emitting device and the substrate, wherein at least a portion of a side surface of the first coating layer may be formed as an inclined surface with respect to the substrate. According to an embodiment, since a curved display device can be implemented using planar micro-LED modules, the curved display can be implemented stably and economically, and digital signage can be applied to various wall surfaces.

Description

Micro LED module, display device including same, and method for manufacturing the display device

[0001] The present invention relates to a micro LED module, a display device including the same, and a method for manufacturing the display device.

[0002] Large-area display devices include liquid crystal displays (LCDs), OLED displays, and micro-LED displays.

[0003] A micro-LED display is a display that uses micro-LEDs, which are semiconductor light-emitting elements with a diameter or cross-sectional area of ​​100㎛ or less, as display elements.

[0004] Micro-LED displays use semiconductor light-emitting diodes (micro-LEDs) as display elements, so they have superior performance in many characteristics, including contrast ratio, response speed, color reproducibility, viewing angle, brightness, resolution, lifespan, luminous efficiency, and brightness.

[0005] In particular, micro-LED displays have the advantage of being able to freely adjust the size and resolution by separating and combining the screen in a modular manner, and the advantage of being able to implement a flexible display. They are being applied not only to TVs but also to digital signage.

[0006] Digital signage is a display installed inside or outside a building using a digital information display (DID), and is a device that provides images or videos containing advertisements or various information.

[0007] Types of digital signage include outdoor digital signage and indoor digital signage.

[0008] Outdoor digital signage refers to digital signage installed on building exteriors, billboards, or for outdoor cinemas. Indoor digital signage refers to digital signage installed on the interior walls of large shopping malls or in the form of signboards.

[0009] However, flat digital signage has limitations in terms of installation and adoption. Installing flat digital signage on curved interior and exterior walls can lead to installation defects, damage from even minor impacts, and inefficient use of space.

[0010] According to one embodiment, the purpose is to implement a curved display device using planar micro LED modules.

[0011] According to one embodiment, the purpose is to implement a curved display device by bonding planar micro LED modules at even intervals.

[0012] According to one embodiment, the purpose is to provide a large curved display device by manufacturing the side of the micro LED module as an inclined surface.

[0013] According to one embodiment, the purpose is to provide a micro LED module that is easy to assemble, pack, repair, and replace by manufacturing the side of the micro LED module as an inclined surface.

[0014] According to one embodiment, the purpose is to provide a large curved display device in which a light diffusion coating layer is formed on the side of a micro LED module, thereby minimizing bright lines or dark lines at the bonding surface between micro LED modules.

[0015] According to one embodiment, the purpose is to provide a curved display device that prevents light leakage and deterioration of image quality by forming a colored coating layer on the outermost side of the display device.

[0016] According to one embodiment, the purpose is to provide a curved digital signage having various curvatures depending on the inclination angle of the side of the micro LED module.

[0017] According to one embodiment, the purpose is to provide a display device having improved bonding between micro LED modules.

[0018] According to one embodiment, the purpose is to provide a display device having improved adhesion between micro LED modules and being resistant to moisture and contamination.

[0019] According to one embodiment, the purpose is to provide a display device in which it is easy to replace a defective micro LED module when a defect occurs in the curved display device.

[0020] A micro LED module according to an embodiment comprises: a substrate; a semiconductor light-emitting element electrically connected to the substrate; and a first coating layer disposed on the semiconductor light-emitting element and the substrate, wherein at least a portion of a side surface of the first coating layer may be formed as an inclined surface with respect to the substrate.

[0021] A second coating layer may be formed on the side of the substrate and the first coating layer.

[0022] The second coating layer may include a light diffusing material.

[0023] The second coating layer may further include an elastic coating layer to prevent cracks caused by micro-vibrations.

[0024] The elastic coating layer may be made of a polymer material having a hardness lower than that of the second coating layer, and may include any one of epoxy, silicone, acrylic, urethane, and PEVA.

[0025] The first side and the second side of the substrate and the first coating layer may have different inclination angles with respect to the substrate.

[0026] The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the first inclination angle and the second inclination angle may be the same.

[0027] The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the first inclination angle and the second inclination angle may be different from each other.

[0028] Some of the side surfaces of the substrate and the first coating layer may be formed perpendicular to the substrate.

[0029] A display device according to an embodiment may include a substrate, a semiconductor light-emitting element electrically connected to the substrate, and a first coating layer disposed on the semiconductor light-emitting element and the substrate, wherein at least some of the side surfaces of the substrate and the first coating layer are formed as inclined surfaces with respect to the substrate; and a second coating layer disposed on the side surfaces of the plurality of micro LED modules to adhere the plurality of micro LED modules to each other.

[0030] It may further include a third coating layer disposed on the outermost side of the plurality of micro LED modules.

[0031] The third coating layer may include a colored pigment.

[0032] The upper surfaces of the plurality of micro LED modules can form a curvature according to the inclination angle of the inclined surface.

[0033] The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the first inclination angle and the second inclination angle may be the same.

[0034] The first side of the substrate and the first coating layer have a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, the second side of the substrate and the first coating layer have a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the first inclination angle and the second inclination angle may be positive inclination angles.

[0035] The first side of the substrate and the first coating layer have a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, the second side of the substrate and the first coating layer have a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the first inclination angle and the second inclination angle may be negative inclination angles.

[0036] The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the first inclination angle and the second inclination angle may be different from each other.

[0037] The first side of the substrate and the first coating layer may have a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the second side of the substrate and the first coating layer may have a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the first inclination angle may be a positive inclination angle and the second inclination angle may be a negative inclination angle.

[0038] A method for manufacturing a display device according to an embodiment may include: forming a substrate; a semiconductor light-emitting element electrically connected to the substrate; and a first coating layer disposed on the semiconductor light-emitting element and the substrate; cutting the substrate and the first coating layer based on a target curvature, wherein first side surfaces of the substrate and the first coating layer have a first inclination angle with respect to a vertical line from an upper surface of the first coating layer to the substrate, and second side surfaces of the substrate and the first coating layer have a second inclination angle with respect to a vertical line from an upper surface of the first coating layer to the substrate; forming a second coating layer on side surfaces of the substrate and the first coating layer including the first side surface and the second side surface; and bonding side surfaces of the plurality of LED modules such that the upper surfaces of the first coating layer form a curvature according to the inclination angle of the inclination surface.

[0039] The method may further include forming a second coating layer on the outermost side of the plurality of joined LED modules; and forming a third coating layer on the lower surface of the substrate.

[0040] The above plurality of LED modules include a first LED module and a second LED module, and a first side of the first LED module has a first inclination angle from a vertical line from the upper surface of the first coating layer to the substrate, a second side of the first LED module has a second inclination angle from a vertical line from the upper surface of the first coating layer to the substrate, a third side of the second LED module has a third inclination angle from a vertical line from the upper surface of the first coating layer to the substrate, and a fourth side of the second LED module has a fourth inclination angle from a vertical line from the upper surface of the first coating layer to the substrate, and at least some of the first to fourth inclination angles may have different inclination angles.

[0041] At least one of the first to fourth inclination angles may have a negative inclination angle.

[0042] According to an embodiment, a curved display device can be implemented using flat micro LED modules, which not only enables stable and economical implementation of a curved display, but also has the effect of enabling application of digital signage to various wall surfaces.

[0043] According to an embodiment, since planar micro LED modules are bonded at even intervals to implement a curved display device, defects that may occur when pressing between modules in the module bonding process can be reduced, thereby reducing production costs, improving productivity, and increasing process reliability.

[0044] According to an embodiment, a large curved display device can be manufactured by manufacturing the side surface of a micro LED module as an inclined surface, so that a large curved display device can be implemented without an additional process, thereby increasing the yield and reducing the unit cost.

[0045] According to an embodiment, the side of the micro LED module is manufactured with an inclined surface so that the adhesive pressure between modules is uniform, thereby reducing defects due to damage to the module during assembly, and preventing damage due to pressure or impact applied during packing, thereby improving the reliability of the product.

[0046] In addition, when repairing or replacing a micro LED module, damage to the coating surface or damage to the module that may occur during the module removal process is prevented, and the side is made of an inclined surface, making replacement easy.

[0047] According to an embodiment, a light diffusion coating layer is formed on the side of a micro LED module, thereby improving the picture quality of a large curved display device by minimizing bright or dark lines at the bonding surface between micro LED modules.

[0048] According to one embodiment, a colored coating layer is formed on the outermost side of a display device to prevent light leakage and deterioration of image quality, and in particular, to resolve the problem of reduced screen immersion due to side exposure of a circuit board.

[0049] According to an embodiment, a curved display having various curvatures can be manufactured depending on the inclination angle of the side of the micro LED module, and the process can be easily applied to the target curvature, so it has excellent commercial feasibility and can be applied to various products.

[0050] According to an embodiment, since a coating material is uniformly formed between micro LED modules, the bonding between modules is improved, the micro LED module bonding process is facilitated, and light leakage or image quality degradation occurring at the bonding site is reduced.

[0051] According to an embodiment, the adhesion between micro LED modules is improved, making them resistant to moisture and contamination, thereby improving damage caused by foreign substances and moisture in the space where the display product is installed, and facilitating cleaning and maintenance.

[0052] According to an embodiment, when a defect occurs in a curved display device, it is easy to replace a defective micro LED module, and an engineered display device can be implemented by applying micro LED modules having various side inclinations, so that the micro LED module can be replaced not only on the back but also on the front of the display device, thereby increasing the convenience of replacement.

[0053] Figure 1 is an example diagram of a display device including an LED module.

[0054] Fig. 2 is a cross-sectional view along line AB of the display device of Fig. 1.

[0055] FIG. 3 is a perspective view of a curved display device including an LED module according to an embodiment.

[0056] Fig. 4 is a cross-sectional view along the CD line of the curved display device of Fig. 3.

[0057] FIG. 5 is a partial perspective view of a curved display device including an LED module according to an embodiment.

[0058] Fig. 6a is a schematic cross-sectional view of an LED module according to an embodiment.

[0059] FIG. 6b is an EF cross-sectional view of the curved display device of FIG. 5.

[0060] Fig. 7a is a cross-sectional view of a third LED module according to an embodiment.

[0061] Fig. 7b is a cross-sectional view of a fourth LED module according to an embodiment.

[0062] FIG. 7c is a cross-sectional view of a display device including a third LED module and a fourth LED module according to an embodiment.

[0063] FIG. 8 is an exemplary diagram showing a repair process of the display device of FIG. 7c according to an embodiment.

[0064] Fig. 9a is a cross-sectional view of a fifth LED module according to an embodiment.

[0065] Fig. 9b is a cross-sectional view of a sixth LED module according to an embodiment.

[0066] Figure 9c is a cross-sectional view of a seventh LED module according to an embodiment.

[0067] FIG. 9d is a cross-sectional view of a display device including a fifth LED module, a sixth LED module, and a seventh LED module according to an embodiment.

[0068] FIG. 10 is an exemplary diagram showing a repair process of the display device of FIG. 9d according to an embodiment.

[0069] Fig. 11a is a cross-sectional view of the eighth LED module according to the embodiment.

[0070] Fig. 11b is a cross-sectional view of a ninth LED module according to an embodiment.

[0071] Fig. 11c is a cross-sectional view of the 10th LED module according to the embodiment.

[0072] Fig. 11d is a cross-sectional view of the 11th LED module according to the embodiment.

[0073] FIG. 11e is a cross-sectional view of a display device including an 8th LED module, a 9th LED module, a 10th LED module, and an 11th LED module according to an embodiment.

[0074] Fig. 12a is a cross-sectional view of the 12th LED module according to the embodiment.

[0075] Fig. 12b is a cross-sectional view of a 13th LED module according to an embodiment.

[0076] Fig. 13 is a cross-sectional view showing a curved display device according to an embodiment.

[0077] Fig. 14 is an example diagram showing a curved display device applied according to an embodiment.

[0078] Hereinafter, a concretely feasible embodiment for solving the above-mentioned problem will be described with reference to the attached drawings.

[0079] In the description of the embodiments, when describing the positional relationship of a component, if it is described as being formed "on or under", "on or under" includes both cases where two components are in direct contact with each other or where one or more other components are arranged indirectly between the two components. In addition, when expressed as "on or under", it may also include the meaning that one component is arranged in an upward direction or downward direction based on the other component. In other words, it means the directionality between the two components, and does not mean above or below on a vertical line based on a horizontal line.

[0080] This interpretation can also be applied to the description of "left or right" in the positional relationship of the composition.

[0081] In addition, referring to the top, bottom or side of a certain configuration in the drawing does not mean the absolutely upper side, the absolutely lower side or the absolutely side, but is broadly interpreted in consideration of the relationship between the configurations described in the detailed description, and this can be interpreted by changing according to the function of the device claimed in the embodiment, the manufacturing process sequence, custom, time, space, the definition of the author, etc.

[0082] FIG. 1 is an exemplary diagram of a display device including an LED module, and FIG. 2 is a cross-sectional view of the display device of FIG. 1 along line AB of FIG. 1.

[0083] A flat display device (1000) may include an LED module (100) including a semiconductor light emitting element for a flat display pixel.

[0084] Depending on the size of the flat display device (1000), the display device (1000) includes at least one LED module (100) including a semiconductor light-emitting element for the display pixel.

[0085] The above display device (1000) is applied to digital signage, and can be applied to indoor digital signage or outdoor digital signage as shown in FIG. 1.

[0086] Here, a flat display device means that the surface of the screen on which the display is made is flat, and even if the flat display device is housed in a curved cabinet and installed on a curved wall, or the back surface of the substrate is not flat, it can still be referred to as a flat display.

[0087] In addition, the term "curved display device" hereinafter means that at least one part of the screen on which the display is made is curved, and even if the curved display device is housed in a flat cabinet and installed on a flat wall, or the back of the substrate is flat, it can be referred to as a curved display.

[0088] Also, although referred to as a curved display, according to the embodiment, the upper surface of the LED module is formed as a plane, and can be seen as being practically side-bonded with an adjacent LED module at a predetermined angle to form a target curvature on the front of the display device.

[0089] Referring to FIG. 2, a flat display device includes a plurality of flat LED modules (100), a substrate (150), a semiconductor light-emitting element (110) on the substrate, and a first coating layer (120) disposed on the substrate (150) and the semiconductor light-emitting element (110).

[0090] FIG. 3 is an exemplary diagram of a display device including an LED module, and FIG. 4 is a cross-sectional view of the display device of FIG. 3 along the CD line of FIG. 3.

[0091] A display device (2000) according to an embodiment may include an LED module (200) including a semiconductor light emitting element for a flat display pixel.

[0092] Depending on the size of the display device (2000), the display device (2000) includes at least one LED module (200) including a semiconductor light emitting element for the display pixel.

[0093] Referring to FIG. 4, a display device (2000) includes a plurality of flat LED modules (200), and the LED modules (200) include a substrate, a semiconductor light-emitting element (210) on the substrate, and a first coating layer (220) disposed on the substrate and the semiconductor light-emitting element (210).

[0094] Adjacent LED modules may form a gap (not shown) between adjacent LED modules to form a curvature on the screen of the display device. A protective film (290) may be formed within the gap.

[0095] The above curvature can be formed to be 1000R to 4000R. The above curvature can preferably be selected from 2000R to 3500R. Here, when the curvature is 2000R, it means the curvature of a circle with a radius of 2000 mm.

[0096] The above protective film (290) may be made of a coating material to prevent the inflow of external dust and moisture.

[0097] The gap increases from the upper surface of the first coating layer (220) toward the substrate, and accordingly, adjacent LED modules are arranged at an angle to each other.

[0098] By arranging the LED modules as described above, the entire screen of the display device can have curvature.

[0099] The above gap can be filled with a protective film coating after the LED modules are placed, and the adjacent LED modules can be bonded to each other by pressure. The adjacent LED modules can be bonded or detached by pressure, and the pressure can be unevenly concentrated by the gap, which can cause damage to the side of the LED module. Such damage to the side of the LED module can lead to a decrease in yield due to a defect in the LED module, and after the product is installed, it can cause a decrease in image quality, a decrease in performance due to dust or moisture penetration.

[0100] FIG. 5 is an exemplary diagram of a display device including an LED module according to an embodiment, FIG. 6a is a schematic cross-sectional view of an LED module according to an embodiment, and FIG. 6b is a cross-sectional view of the display device of FIG. 5 along line EF of FIG. 5.

[0101] A display device (3000) according to an embodiment may include an LED module (300) including a semiconductor light emitting element for a flat display pixel.

[0102] When a portion of the front of the display device is formed with a curve, it may be referred to as a curved display device or a curved display device to distinguish it from a flat display device.

[0103] Depending on the size of the display device, the display device (3000) includes at least one LED module (300) including a semiconductor light emitting element for the display pixel.

[0104] Referring to FIG. 6a, a display device (3000) includes a plurality of planar LED modules (300), and the LED modules (300) include a substrate (350), a semiconductor light-emitting element (310) on the substrate (350), and a first coating layer (320) disposed on the substrate (350) and the semiconductor light-emitting element (310).

[0105] The above substrate (350) may be a printed circuit board (PCB).

[0106] The substrate (350) may be formed of a conductive substrate or an insulating substrate. For example, the substrate (350) may be formed by including at least one of sapphire (Al2O3), SiC, Si, GaAs, GaN, ZnO, Si, GaP, InP, Ge, and Ga2O3.

[0107] In addition, the substrate (350) may be a structure for mounting the semiconductor light-emitting element (310). The semiconductor light-emitting element (310) may be an LED chip. The semiconductor light-emitting element (310) may be a micro LED chip.

[0108] The above LED chip may include a semiconductor light-emitting element for display pixels that implements each pixel.

[0109] The above LED chip may include, but is not limited to, a first LED chip, a second LED chip, and a third LED chip, and is described as a semiconductor light-emitting element without referring to each of them in the drawing.

[0110] Each of the first to third LED chips may be arranged in a repeating manner to form an individual subpixel. For example, the first to third LED chips may be a red light-emitting element, a green light-emitting element, and a blue light-emitting element, respectively, but are not limited thereto.

[0111] The above semiconductor light-emitting element (310) may have a size in the micrometer (㎛) unit and may be referred to as a micro LED chip. The micrometer (㎛) size may mean that the width of at least one side of the light-emitting element has a size of several to several hundred ㎛.

[0112] The above first coating layer (320) includes at least one layer, and may be called an adhesive layer, a protective layer, an optical film layer, a light diffusion layer, a CPI film layer, an AG (Anti Glare) coating layer, an AF (Anti finger print) coating layer, or an OCA layer depending on its function and purpose, and may be formed of a plurality of layers.

[0113] When the first coating layer (320) is composed of multiple layers, the refractive index of each layer can be formed differently to increase the light extraction effect of the micro LED chip.

[0114] The above first coating layer (320) may include at least one of silicone, acrylic polymer, and epoxy, but is not limited thereto.

[0115] Additionally, the first coating layer (320) may include a light scattering agent in at least one layer, and the light scattering agent may include at least one of Zr, Fi, Ti, Zn, BaS, and oxides thereof.

[0116] The above substrate (350) may be directly connected to the semiconductor light-emitting element (310) or may be electrically connected to the semiconductor light-emitting element (310).

[0117] Other layers may be formed between the substrate (350) and the semiconductor light-emitting element (310), which may be components for electrically connecting the semiconductor light-emitting element (310) or the substrate (350), or may be components for electrically insulating them.

[0118] The above substrate (350) may include at least one through hole, and a structure may be formed or arranged to be fastened to a basket in which the LED module (300) is stored.

[0119] One side of the substrate (350) and the first coating layer (320) may be formed with a positive first inclination angle (θ) from a vertical line to the substrate on the upper surface of the first coating layer (320) to form an inclined surface.

[0120] The other side of the substrate (350) and the first coating layer (320) may be formed with a second inclination angle (θ) that is the same as the first inclination angle (θ) from a vertical line to the substrate (350) on the upper surface of the first coating layer (320) to form an inclined surface.

[0121] The above-mentioned one side and the other side may be opposite sides of the LED module, which may be sides arranged in the longitudinal direction of the display device forming the curvature.

[0122] Even if the display device does not form a curvature in the short axis direction, the side surfaces of the LED modules arranged in the short axis direction may also be formed as inclined surfaces, which is intended to maximize the various effects suggested by the present invention, and can promote strengthening the sturdiness of the product, improving the reliability of the process, reducing the defect rate, and increasing the convenience of replacement.

[0123] The above LED module (300) forms a polygonal display module, and at least one side is formed as an inclined surface.

[0124] In the dicing process for forming the inclined surface of the LED module (300), when the substrate (350) and the first coating layer (320) are diced together, the side surfaces of the first coating layer (320) and the substrate (350) can form the same inclined surface.

[0125] In the embodiment of FIG. 6a, the width a of the upper surface of the first coating layer (320) of the LED module (300) may be smaller than the width b of the lower surface of the substrate (350), which may be determined by the first inclination angle (θ) and the second inclination angle (θ). Alternatively, the first inclination angle (θ) and the second inclination angle (θ) may be determined by the widths a and b. However, in calculating the first inclination angle (θ) and the second inclination angle (θ), it is not simply determined by the width a of the upper surface of the first coating layer (320) and the width b of the lower surface of the substrate (350), but may be determined by taking into consideration the target curvature, the thickness of the substrate, the thickness of the first coating layer, the number and size of LED modules, etc.

[0126] Referring to FIG. 6b, at least one semiconductor light-emitting element disposed on the substrate (350) is preferably disposed at a constant interval from each other, but in adjacent first LED modules (301) and second LED modules (302), the interval between the outermost semiconductor light-emitting element of the adjacent first LED module (301) and the outermost semiconductor light-emitting element of the adjacent second LED module (302) may be different from the interval between the semiconductor light-emitting elements within the module.

[0127] The gap between the outermost semiconductor light-emitting element of the first LED module (301) and the outermost semiconductor light-emitting element of the second LED module (302) can be adjusted by the side inclination angle of the module, the thickness of the second coating layer (390) disposed between the first LED module (301) and the second LED module (302), the thickness and properties of the first coating layer (321, 322) disposed on the substrate (350), the target curvature, and image quality issues such as bright lines or dark lines that may occur between the first and second LED modules (301, 302).

[0128] The thickness (t1) of the second coating layer (390) can be formed within the range of 10 to 80 μm.

[0129] The coating material of the second coating layer (390) may be a material having a viscosity of 1000 to 6000 cps.

[0130] The second coating layer (390) may further include an elastic coating layer to prevent damage (e.g., cracks) to the module due to micro-vibrations.

[0131] The elastic coating layer may be made of a polymer material having a hardness lower than that of the second coating layer (390), and may include any one of epoxy, silicone, acrylic, urethane, and PEVA.

[0132] According to one embodiment of the process, a coating layer may be formed on a side of the first LED module (301) and a coating layer may be formed on a side of the second LED module (302), so that the second coating layer (390) may be formed by bonding the first LED module and the second LED module.

[0133] The semiconductor light emitting element disposed at the outermost side of the first LED module (301) may be formed on the inner side of the upper edge of the first coating layer (320), and the distance (d2) from the outer end of the outermost semiconductor light emitting element to the side of the adjacent first LED module (301), the semiconductor light emitting element disposed at the outermost side of the second LED module (302) may be formed on the inner side of the upper edge of the first coating layer (320), and the distance (d1) from the outer end of the outermost semiconductor light emitting element to the side of the adjacent second LED module, and the distance (e) from the upper surface of the first coating layer (322) of the second LED module (302) to the side of the second LED module (302) from a vertical line with respect to the substrate (352) may be determined by the pitch and each inclination angle for each micro LED model.

[0134] The distance (e) from the upper surface of the first coating layer (322) of the second LED module (302) to the side of the second LED module from a vertical line to the substrate (352) can be formed within a range of 0 to 164 μm.

[0135] The pitch for each micro LED model may be, for example, 680um, 780um, 937.5um, 1250um, 1500um, or 2500um, and the distance (d1, d2) may be less than or equal to half of the pitch.

[0136] The above inclination angle may be 0.5 to 5°. The above inclination angle may be determined by considering the target curvature, the thickness of the substrate, the thickness of the first coating layer, the number and size of LED modules, etc.

[0137] The above curved display device can be formed by joining several to several hundred LED modules in the long and short axis directions, and can form a curvature in the long axis direction or the short axis direction.

[0138] According to an embodiment, since planar micro LED modules are bonded at even intervals to implement a curved display device, there is a technical effect of reducing defects that may occur when pressing between modules in the module bonding process, thereby reducing production costs, improving productivity, and increasing process reliability.

[0139] According to an embodiment, a large curved display device can be manufactured by manufacturing the side surface of a micro LED module as an inclined surface, so that a large curved display device can be implemented without an additional process, thereby increasing the yield and reducing the unit cost.

[0140] According to an embodiment, the side of the micro LED module is manufactured as an inclined surface so that the adhesive pressure between modules is uniform, thereby reducing defects due to module damage during assembly, and preventing damage due to pressure or impact applied during packaging, thereby improving product reliability. In addition, when repairing or replacing the micro LED module, damage to the coating surface or damage to the module that may occur during the removal and installation of the module is prevented, and the side is made as an inclined surface, which has the advantage of making replacement easy.

[0141] If the display device (3000) illustrated in FIG. 5 has LED modules joined in the longitudinal direction to form a curvature, the first LED module (301) and the second LED module (302) are arranged adjacent to each other in the longitudinal direction of the display device.

[0142] The second LED module (302) is depicted as the outermost LED module of the display device in the longitudinal direction, and a third coating layer (395) is formed on the outermost side of the second LED module (302).

[0143] However, the third coating layer (395) is not formed only on the outermost LED module in the long-axis direction, but may also be formed on the outermost LED module in the short-axis direction of the display device (3000) so as to surround the outer surface of the display device (3000).

[0144] The third coating layer (395) may be a coating material containing a black pigment.

[0145] The third coating layer (395) may include at least one of an acrylic polymer, silicone, and epoxy.

[0146] The third coating layer (395) is formed on the side of the first coating layer (321) and the substrate (351), thereby solving the problem of lowering the display quality and reducing the sense of immersion due to deterioration of image quality caused by exposure of the substrate (351).

[0147] The third coating layer (395) may be formed with a uniform thickness, but may be formed with a different thickness depending on the purpose of resolving the deterioration of image quality due to exposure of the substrate or for the purpose of moisture permeability or a protective film. For example, it may be formed thicker on the side of the substrate. For example, when the inclination angle of the outermost side of the first LED module (301) has a negative inclination angle with respect to the vertical line from the first coating layer (321) to the substrate (351), the thickness of the third coating layer (395) may be formed thicker on the side of the substrate (351).

[0148] Alternatively, when the inclination angle of the outermost side of the first LED module (301) has a positive inclination angle with respect to the vertical line from the first coating layer (321) to the substrate (351), the thickness of the third coating layer (395) may be formed thicker on the side of the first coating layer (321). Alternatively, the third coating layer (395) may be formed such that the inclination angle of the outermost side of the first LED module (301) is 0°.

[0149] The pigment of the third coating layer (395) may be a black pigment, but may appear black or gray depending on the amount of pigment mixed into the coating material of the third coating layer (395), and at least one color pigment may be mixed and used instead of the black pigment.

[0150] The coating material of the third coating layer (395) can be formed using a stamping technique using a material having a viscosity of 1000 to 6000 cps.

[0151] The thickness of the third coating layer (395) can be formed within the range of 100 to 1000 μm.

[0152] The display device according to the embodiment can be mounted on a cabinet and assembled in a block manner to implement the display device according to the embodiment.

[0153] The above display device (3000) can implement a curved display of various sizes by forming the sides of a plurality of LED modules into inclined surfaces and connecting them to have a target curvature on the front.

[0154] The display device according to the embodiment has a sloped side, making it easy to remove and replace the LED module in the event of a defect. Therefore, the product can be installed in various spaces where the curved display device was previously difficult to install.

[0155] Furthermore, the uniform bonding between LED modules reduces performance degradation and defect rates due to moisture and dust ingress, extending replacement cycles and facilitating maintenance. Furthermore, depending on the space where the curved display device is installed, periodic cleaning may be essential. The uniform bonding between LED modules protects the curved display device from shock and moisture during cleaning, extending its lifespan.

[0156] From the perspective of customers purchasing digital signage, this not only achieves a functional purpose by implementing a curved display, but also provides an aesthetic effect, and expands the applicability of the product by allowing display devices to be installed in spaces where flat digital signage could not be installed.

[0157] In addition, in the past, when replacing a defective module, there was a problem that damage occurred during the replacement, which resulted in additional defects, but according to the embodiment, stable replacement is possible, and the convenience of replacement is also increased and management is made easier, so there is the effect of reducing costs.

[0158] FIG. 7a is a cross-sectional view of a third LED module according to an embodiment, FIG. 7b is a cross-sectional view of a fourth LED module according to an embodiment, and FIG. 7c is a cross-sectional view of a display device including the third LED module and the fourth LED module according to an embodiment.

[0159] FIG. 8 is an exemplary diagram showing a repair process of the display device of FIG. 7c according to an embodiment.

[0160] According to FIG. 7a, the third LED module (401) includes a substrate, a semiconductor light-emitting element formed on the substrate, the substrate (451), and a first coating layer (421) formed on the semiconductor light-emitting element (411).

[0161] One side of the third LED module (401) has a positive first inclination angle (θ), and the other side has a positive second inclination angle (θ).

[0162] One side of the substrate (451) and the first coating layer (421) has the first inclination angle (θ) with respect to a vertical line from the upper surface edge of the first coating layer (421) to the substrate (451), and the other side of the substrate (451) and the first coating layer (421) has the second inclination angle (θ) with respect to a vertical line from the upper surface of the first coating layer (421) to the substrate (451).

[0163] The first inclination angle (θ) and the second inclination angle (θ) may be sides facing each other.

[0164] The first inclination angle (θ) and the second inclination angle (θ) may form the same angle to form symmetry, but are not limited thereto.

[0165] Since the first inclination angle (θ) and the second inclination angle (θ) are for forming a curvature by bonding with adjacent LED modules, the first inclination angle (θ) and the second inclination angle (θ) may be determined differently depending on the target curvature.

[0166] Here, the curvature may mean that since the top surface of the LED module is flat, the flat LED modules are arranged at an angle rather than on a flat surface, resulting in a curved shape on the front of the display device.

[0167] The width (a) of the upper surface of the first coating layer (421) may be smaller than the width (b) of the lower surface of the substrate (451).

[0168] According to FIG. 7b, the fourth LED module (402) includes a substrate (452), a semiconductor light-emitting element (412) formed on the substrate (452), and a first coating layer (422) formed on the substrate (452) and the semiconductor light-emitting element (412).

[0169] One side of the fourth LED module (402) has a negative third inclination angle (θ), and the other side has a negative fourth inclination angle (θ).

[0170] Here, the negative inclination angle means that one side of the substrate (452) and the first coating layer (422) is defined as 0° with respect to a vertical line from the upper surface edge of the first coating layer (422) to the substrate (452) and has the third inclination angle (θ) toward the inside of the first coating layer (422), and the other side of the substrate (452) and the first coating layer (422) has the fourth inclination angle (θ) toward the inside of the first coating layer (422) with respect to a vertical line from the upper surface of the first coating layer (422) to the substrate (452).

[0171] In this case, the width (c) of the upper surface of the first coating layer (422) may be greater than the width (d) of the lower surface of the substrate (452).

[0172] Referring to FIG. 7c, the display device (4000) can be formed by combining the third LED module (401) and the fourth LED module (402).

[0173] The curvature of the display device (4000) according to the embodiment can be adjusted according to the angles of the first inclination angle (θ), the second inclination angle (θ), the third inclination angle (θ), and the fourth inclination angle (θ), and even if the side of the LED module has an inclination angle, the display device can be formed as a plane.

[0174] Figure 8 is an exemplary diagram showing a process for replacing a defective LED module when a defect occurs in some LED modules of a display device.

[0175] A display device (4000) according to an embodiment may include a third LED module (401) and a fourth LED module (402).

[0176] In the case of digital signage, the frequency of malfunctions is expected to be higher than that of home display devices or personal display devices because the screen is installed in an environment where it is on for a long time and various variables exist.

[0177] Therefore, in terms of economy, only the defective LED module is replaced rather than replacing the entire display device. In the display device according to the embodiment, the LED module can be replaced not only from the back but also from the front, so the convenience and ease of replacement can be increased.

[0178] In particular, when a defective LED module is difficult to remove from the front (or back) of the display device, the adjacent LED module can be removed first and then the defective LED module can be replaced, thereby securing a working space for replacement, resulting in excellent stability.

[0179] FIG. 9a is a cross-sectional view of a fifth LED module according to an embodiment, FIG. 9b is a cross-sectional view of a sixth LED module according to an embodiment, FIG. 9c is a cross-sectional view of a seventh LED module according to an embodiment, and FIG. 9d is a cross-sectional view of a display device including a fifth LED module, a sixth LED module, and a seventh LED module according to an embodiment.

[0180] FIG. 10 is an exemplary diagram showing a repair process of the display device of FIG. 9d according to an embodiment.

[0181] According to FIG. 9a, the fifth LED module (501) includes a substrate, a semiconductor light-emitting element formed on the substrate, and a first coating layer formed on the substrate and the semiconductor light-emitting element.

[0182] One side of the fifth LED module (501) has a positive first inclination angle (θ), and the other side has a positive second inclination angle (θ).

[0183] One side of the substrate and the first coating layer has the first inclination angle (θ) with respect to a vertical line from the upper surface of the first coating layer to the substrate, and the other side of the substrate and the first coating layer has the second inclination angle (θ) with respect to a vertical line from the upper surface of the first coating layer to the substrate.

[0184] The first inclination angle (θ) and the second inclination angle (θ) may be sides facing each other.

[0185] The first inclination angle (θ) and the second inclination angle (θ) may form the same angle to form symmetry, but are not limited thereto.

[0186] Since the first inclination angle (θ) and the second inclination angle (θ) are for forming a curvature by bonding with adjacent LED modules, the first inclination angle and the second inclination angle may be determined differently depending on the target curvature.

[0187] According to FIG. 9b, the sixth LED module (502) may have one side having a negative third inclination angle (θ) and the other side having a negative fourth inclination angle (θ).

[0188] In the sixth LED module ((502), one side of the substrate and the first coating layer has the third inclination angle (θ) in the direction inward of the first coating layer with respect to a line perpendicular to the substrate from the upper surface of the first coating layer, and the other side of the substrate and the first coating layer has the fourth inclination angle (θ) in the direction inward of the first coating layer with respect to a line perpendicular to the substrate from the upper surface of the first coating layer.

[0189] Referring to FIG. 9c, the seventh LED module (503) may have one side having a negative fifth inclination angle (θ) and the other side having a positive sixth inclination angle (θ).

[0190] That is, in the seventh LED module (503), one side of the substrate and the first coating layer has the sixth inclination angle (θ) in the outer direction of the first coating layer with respect to a vertical line from the upper surface edge of the first coating layer to the substrate, and the other side of the substrate and the first coating layer has the fifth inclination angle (θ) in the inner direction of the first coating layer with respect to a vertical line from the upper surface edge of the first coating layer to the substrate.

[0191] The upper surface width (e) of the first coating layer of the above-mentioned 7th LED module (503) may be the same as the lower surface width (f) of the substrate, but may be different depending on the 5th inclination angle (θ) and the 6th inclination angle (θ).

[0192] The upper surface width (a) of the fifth LED module (501), the upper surface width (c) of the sixth LED module (502), and the upper surface width (e) of the seventh LED module (503) may be the same.

[0193] The bottom width (b) of the fifth LED module (501), the bottom width (d) of the sixth LED module (502), and the bottom width (f) of the seventh LED module (503) may be the same, but may be different depending on the size of the curvature and the angle of inclination.

[0194] The cross-section of the fifth LED module (501) may be a trapezoidal shape, the sixth LED module (502) may be an inverse trapezoidal shape with respect to the cross-section of the fifth LED module (501), and the cross-section of the seventh LED module (503) may be a parallelogram.

[0195] Referring to FIG. 9d, the display device can implement a screen having a predetermined curvature by arranging the fifth to seventh LED modules having inclined sides.

[0196] According to an embodiment, a target curvature can be implemented by arranging LED modules having various side slopes.

[0197] As illustrated in FIG. 10, a display device including the fifth to seventh LED modules (501, 502, 503) can conveniently replace a module by removing the defective LED module or an adjacent LED module from the front (or rear) when a defective LED module occurs.

[0198] If the LED module is not defective but is removed, the removed LED module can be placed back in its original position after removing the second coating layer formed on the side, and then forming the second coating layer again on the side of the LED module.

[0199] Fig. 11a is a cross-sectional view of an eighth LED module according to an embodiment, Fig. 11b is a cross-sectional view of a ninth LED module according to an embodiment, Fig. 11c is a cross-sectional view of a tenth LED module according to an embodiment, and Fig. 11d is a cross-sectional view of an eleventh LED module according to an embodiment. Fig. 11e is a cross-sectional view of a display device including an eighth LED module, a ninth LED module, a tenth LED module, and an eleventh LED module according to an embodiment.

[0200] Detailed descriptions of configurations that overlap with the LED modules according to the embodiments described above are omitted.

[0201] FIG. 11a and FIG. 11b show that the side slopes of the eighth and ninth LED modules (601, 602) form a positive angle (θθθθ) with respect to the vertical line from the first coating layer to the substrate, and that the side slope angle (θθ) of the ninth LED module (602) can be formed to be greater than the side slope angle (θθ) of the eighth LED module (601).

[0202] Accordingly, the widths (b, b') of the lower surfaces of the substrates of the 8th LED module (601) and the 9th LED module (602) may be different from each other. The width (b') of the lower surface of the substrate of the 9th LED module (602) may be greater than the width (b) of the lower surface of the substrate of the 8th LED module (601).

[0203] The width (a') of the upper surface of the first coating layer of the 9th LED module (602) may be smaller than the width (a) of the upper surface of the first coating layer of the 8th LED module (601), but may preferably be the same.

[0204] When the width (a') of the upper surface of the first coating layer of the 9th LED module (602) is the same as the width (a) of the upper surface of the first coating layer of the 8th LED module (601), the sizes of the modules can be arranged uniformly when the screen is viewed from the front, making design and assembly easier and reducing defects that may occur in the process.

[0205] FIG. 11c and FIG. 11c show that the side slopes of the 10th and 11th LED modules (603, 604) form a negative angle of inclination with respect to the vertical line from the first coating layer to the substrate, and the side slope angle (θθ) of the 11th LED module (604) can be formed to be greater than the side slope angle (θθ) of the 10th LED module (603).

[0206] Accordingly, the widths of the lower surfaces of the substrates of the 10th LED module and the 11th LED module may be different from each other. The width (d') of the lower surface of the substrate of the 11th LED module (604) may be smaller than the width (d) of the lower surface of the substrate of the 10th LED module (603).

[0207] The width (c') of the upper surface of the first coating layer of the 11th LED module (604) may be greater than, but preferably equal to, the width (c) of the upper surface of the first coating layer of the 10th LED module (603), and the effect thereof is the same as that described in the description of FIGS. 11a and 11b.

[0208] Referring to FIG. 11e, a display device (6000) having various curvatures can be implemented relatively easily through design changes by combining and arranging the 9th to 11th LED modules (602, 603, 604), thereby reducing the cost of product manufacturing and enabling application to various spaces.

[0209] In addition, it is possible to create displays of various shapes, moving away from the conventional rectangular display devices, so that the display devices themselves can have aesthetic value and be considered works of art.

[0210] FIG. 12a is a cross-sectional view of a 12th LED module according to an embodiment, and FIG. 12b is a cross-sectional view of a 13th LED module according to an embodiment.

[0211] Detailed descriptions of configurations that overlap with the LED modules according to the embodiments described above are omitted.

[0212] According to the embodiment, the 12th LED module (701) shows an example in which the inclination angle (θ) of one side and the inclination angle (θ) of the other side have different positive inclination angles.

[0213] According to an embodiment, the 13th LED module (702) shows an example in which the inclination angle (θ) of one side and the inclination angle (θ) of the other side have different negative inclination angles.

[0214] Since the embodiments are intended to show that a display device is formed by combining LED modules having various side inclination angles, the present invention is not limited to the presented embodiments, and a display device having a target curvature can be implemented through design changes.

[0215] Fig. 13 is a cross-sectional view of a display device according to an embodiment, and Fig. 14 is an example diagram to which a display device according to an embodiment is applied, and explains a formula for calculating an inclination angle according to a target curvature.

[0216] Detailed descriptions of configurations that overlap with the LED modules according to the embodiments described above are omitted.

[0217] Referring to FIG. 13, the substrate (850) and the first coating layer (820) of the LED modules (800) are side-bonded to form a display device (8000) having a predetermined target curvature.

[0218] The side surfaces of the above ED modules (800) may be formed as inclined surfaces having a predetermined angle of inclination with respect to the vertical line of the substrate (850), and the LED modules (800) are spaced apart from each other on the inclined surfaces with the second coating layer (890) interposed therebetween, thereby having a target curvature on the front surface of the display device (8000).

[0219] As an example, the side surface of the outermost LED module may be oriented at 0° with respect to the vertical line of the substrate. That is, the outermost side surface of the LED module may be perpendicular to the substrate (850), but by forming the side surface of the outermost LED module at an angle as illustrated, the effect described above may also be expected.

[0220] The outermost side of the above display device (8000) may have a third coating layer (895) formed on it.

[0221] A fourth coating layer (899) may be formed on the lower surface of the above substrate (850).

[0222] Considering the manufacturing process of the above display device (8000), the fourth coating layer (899) can be formed after the second and third coating layers (890, 895) are formed.

[0223] The fourth coating layer (899) can prevent moisture from penetrating into the LED module or contamination by dust, which can result in a decrease in performance, and can prevent damage to the substrate due to impact and external factors.

[0224] Compared to the thickness and material of the second coating layer (890), the thickness and material of the fourth coating layer (899) are formed on the back surface of the substrate and do not directly affect the image quality, so the range of material selection can be wide.

[0225] The second coating layer (890) may include a light diffusing agent (891).

[0226] The thickness of the fourth coating layer (899) may be thicker than the thickness of the second coating layer.

[0227] The fourth coating layer (899) may include at least one of silicone, acrylic polymer, and epoxy, but is not limited thereto.

[0228] Referring to Fig. 14, a display device (9000) according to an embodiment can be installed on an inner wall of a tunnel (1). When the tunnel (1) is formed in a semi-cylindrical shape, the cross-section of the tunnel (1) can be viewed as a semicircle with a diameter of R1. If the diameter from the center of the tunnel (1) to the upper surface of the installed display device is R2, the number of LED modules arranged along the perimeter is m (L1, L2 to Lm), and the thickness of the display device is d (thickness of the substrate + thickness of the first coating layer), the calculation formula for the 'average inclination angle' can be determined by the following mathematical formula.

[0229] Average slope angle = arctan {(π×R1-π×R2) / 2m} / d

[0230] Here, the average inclination angle refers to the average inclination angle of one side, assuming that the LED modules arranged in a semicircle have inclination angles on both opposing sides.

[0231] The above inclination angle can be 0.5 to 5°.

[0232] The above curvature can be formed to be 1000R to 4000R.

[0233] The above curvature can preferably be selected from 2000R to 3500R.

[0234] Here, if the curvature is 2000R, it means the curvature of a circle with a radius of 2000 mm.

[0235] Although the above description focuses on examples, these are merely examples and are not intended to limit the examples. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present examples. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the embodiments set forth in the appended claims.

[0236]

[0237] [Explanation of symbols]

[0238] 3000: Display device 300: LED module

[0239] 310: Semiconductor light emitting element 320: First coating layer

[0240] 350: Substrate 390: Second coating layer

[0241] 395: Third coating layer 399: Fourth coating layer

[0242]

[0243] The display device of the embodiment can be applied to digital signage. For example, the display device of the embodiment can be applied to indoor digital signage or outdoor digital signage.

Claims

1. Substrate; A semiconductor light emitting element electrically connected to the substrate; and It includes the semiconductor light emitting element and the first coating layer disposed on the substrate, A micro LED module in which at least a portion of a side surface of the first coating layer is formed as an inclined surface with respect to the substrate.

2. In paragraph 1, A micro LED module in which a second coating layer is formed on the side of the substrate and the first coating layer.

3. In paragraph 2, A micro LED module wherein the second coating layer includes a light diffusion material.

4. In paragraph 1, A micro LED module in which the first side and the second side of the substrate and the first coating layer have different inclination angles with respect to the substrate.

5. In paragraph 1, The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, A micro LED module wherein the first inclination angle and the second inclination angle are the same.

6. In paragraph 1, The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, A micro LED module wherein the first inclination angle and the second inclination angle are different from each other.

7. In paragraph 1, A micro LED module in which some of the sides of the substrate and the first coating layer are formed perpendicular to the substrate.

8. Substrate; A semiconductor light emitting element electrically connected to the above substrate; It includes the semiconductor light emitting element and the first coating layer disposed on the substrate; At least a portion of the side surface of the substrate and the first coating layer constitutes a plurality of micro LED modules formed as an inclined surface with respect to the substrate, A second coating layer disposed on the side of the plurality of micro LED modules and bonding the plurality of micro LED modules to each other, Display device.

9. In paragraph 8, A display device further comprising a third coating layer disposed on the outermost side of the plurality of micro LED modules.

10. In paragraph 9, A display device wherein the third coating layer includes a colored pigment.

11. In paragraph 8, A display device in which the upper surfaces of the plurality of micro LED modules form a curvature according to the inclination angle of the inclined surface.

12. In paragraph 8, The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, A display device wherein the first inclination angle and the second inclination angle are the same.

13. In paragraph 8, The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, A display device wherein the first inclination angle and the second inclination angle are positive inclination angles.

14. In paragraph 8, The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, A display device wherein the first inclination angle and the second inclination angle are negative inclination angles.

15. In paragraph 8, The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The first inclination angle and the second inclination angle are different display devices.

16. In paragraph 8, The first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, The second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, A display device wherein the first inclination angle is a positive inclination angle and the second inclination angle is a negative inclination angle.

17. A step of forming a substrate, a semiconductor light-emitting element electrically connected to the substrate, and a first coating layer disposed on the semiconductor light-emitting element and the substrate; A step of forming a plurality of LED modules by cutting the substrate and the first coating layer based on a target curvature, wherein a first side of the substrate and the first coating layer has a first inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate, and a second side of the substrate and the first coating layer has a second inclination angle with respect to a vertical line from the upper surface of the first coating layer to the substrate; A step of forming a second coating layer on the side of the substrate and the first coating layer including the first side and the second side; and A method for manufacturing a display device, comprising the step of bonding the side surfaces of the plurality of LED modules so that the upper surfaces of the first coating layer form a curvature according to the first and second inclination angles of the inclined surface.

18. In paragraph 17, A step of forming a second coating layer on the outermost side of the plurality of joined LED modules; and A method for manufacturing a display device further comprising the step of forming a third coating layer on the lower surface of the substrate.

19. In paragraph 17, The above plurality of LED modules include a first LED module and a second LED module, The first side of the first LED module has a first inclination angle from a vertical line from the upper surface of the first coating layer to the substrate, and the second side of the first LED module has a second inclination angle from a vertical line from the upper surface of the first coating layer to the substrate. The third side of the second LED module has a third inclination angle from a vertical line from the upper surface of the first coating layer to the substrate, and the fourth side of the second LED module has a fourth inclination angle from a vertical line from the upper surface of the first coating layer to the substrate. A method for manufacturing a display device, wherein at least some of the first to fourth inclination angles have different inclination angles.

20. In paragraph 17, A method for manufacturing a display device, wherein at least one of the first to fourth inclination angles has a negative inclination angle.

Images