Curved surface type display device and laminating device and method thereof

Abstract

The present invention provides a curved-surface-type display device in which a display panel is bonded to a protective cover plate by means of an optical adhesive layer, the protective cover plate comprising a planar region and an edge bending region around the planar region, and the curved-surface-type display device is characterized in that: the curved-surface-type display device is provided with a curved surface; the stacking apparatus includes: a pad unit on which the display panel is provided; a lower jig that supports the pad unit and vertically moves the pad unit up and down; and an independent control type heating unit provided in the pad unit and selectively or independently controlling a temperature of the optical adhesive layer for at least a portion of the protective cover plate during bonding of the protective cover plate and the display panel to remove a predicted defect in the edge bending region of the protective cover plate.

Description

Technical Field

[0001] The present invention relates to a curved display device, a stacking device and a method thereof, and more particularly to a curved display device, a stacking device and a method thereof capable of resolving a high curvature problem that is poorly predicted. Background Art

[0002] Display devices include liquid crystal display (LCD) devices and organic light emitting display (OLED) devices.

[0003] The liquid crystal display (LCD) device includes a liquid crystal display panel that displays images using the light transmittance of liquid crystals, and a backlight assembly that is disposed under the liquid crystal display panel and provides light to the liquid crystal display panel.

[0004] The organic light emitting display (OLED) uses an organic light emitting diode (OLED) that emits light by recombination of electrons and holes to display images. Such an organic light emitting display is the most widely used due to its fast response speed and low power consumption.

[0005] To enable displays to provide a wide field of view, curved displays have been developed, where the edges of the screen curve toward the viewer. These curved displays allow for wider viewing angles and enhanced depth perception. These displays are being developed in a variety of sizes, curvatures, and resolutions suitable for a variety of applications, including TVs, monitors, smartphones, and wearable devices.

[0006] The curved display device can be formed into a variety of structures. It can include a protective cover to protect its interior from external impact, as well as various film components attached to the window. As mentioned above, the curved display device often has various shapes, and therefore, accurately attaching the film component to the protective cover becomes a significant issue. In particular, various devices have been proposed or invented to accurately attach the film component to the protective cover, and various research efforts have been conducted. Summary of the Invention

[0007] The present invention is proposed to solve such problems, and an object of the present invention is to provide a high-curvature curved display device, a stacking device and a method thereof, which can solve the prediction failure that may occur in the curved area of the curved display device.

[0008] According to an embodiment of the present invention, a stacking device for a curved display device is provided, wherein a display panel is bonded to a protective cover plate using an optical adhesive layer, and the protective cover plate is composed of a flat area and an edge curved area around the flat area, and is characterized in that the stacking device includes: a pad unit, on the upper portion of which the display panel is provided; a lower clamp, which supports the pad unit and can be moved up and down perpendicular to the pad unit; and an independently controlled heating unit, which is arranged on the pad unit, and selectively or independently controls the temperature of the optical adhesive layer on at least a portion of the protective cover plate during the bonding of the protective cover plate and the display panel to remove predicted defects in the edge curved area of the protective cover plate.

[0009] According to an embodiment of the present invention, a stacking method for a curved display device is characterized in that it includes: a step of using an upper clamp to provide a protective cover plate, wherein the protective cover plate includes a middle plane area and an edge bending area around the plane area; a step of using a lower clamp to provide a pad unit arranged below the upper clamp; a step of providing a display panel having an optical adhesive layer on the pad unit; and a step of moving the upper clamp or the lower clamp in a direction perpendicular to the pad unit and using the optical adhesive layer to bond the protective cover plate below the upper clamp and the display panel on the pad unit arranged on the lower clamp; selectively or independently controlling the temperature of the optical adhesive layer on at least a portion of the protective cover plate to remove predicted defects generated in the edge bending area of the protective cover plate.

[0010] According to an embodiment of the present invention, a lamination method for a curved display device may further include: a step of removing wrinkles by heating a central area of the display panel corresponding to the planar area of the protective cover; and a step of increasing fluidity by indirectly heating the optical adhesive layer arranged on the central area of the display panel.

[0011] According to an embodiment of the present invention, a lamination method for a curved display device is characterized in that it may include: a step of heating an edge area of the display panel corresponding to the edge bending area of the protective cover to form a curved area, including a step of heating the edge area of the display panel to a high temperature above room temperature to reduce the adhesive force compared to room temperature by heating the edge area of the display panel, and removing bubbles through the edge area of the display panel corresponding to the edge bending area of the protective cover.

[0012] According to another embodiment of the present invention, a stacking method for an enlarged curved display device can selectively or independently control the temperature of the optical adhesive layer on the display panel for at least a portion of the protective cover while moving the upper clamp or the lower clamp in a direction perpendicular to the pad unit to join the curved protective cover below the upper clamp and the display panel arranged on the lower clamp, so as to remove predicted defects in the edge bending area of the protective cover.

[0013] According to another embodiment of the present invention, a curved display device is manufactured by bonding a display panel to a protective cover plate using an optical adhesive layer. The protective cover plate is composed of a flat area and an edge curved area around the flat area. During bonding of the protective cover plate and the display panel, the temperature of the optical adhesive layer is selectively or independently controlled for at least a portion of the protective cover plate to eliminate predicted defects in the edge curved area.

[0014] According to an embodiment of the present invention, a curved display device, a stacking device and a method thereof, a pad unit equipped with a display panel is divided into a curved elastic pad portion and a supporting body, so that an independently controlled heating unit can be selectively set on the curved elastic pad portion with a variety of materials, shapes and designs, and can be easily replaced. When the protective cover is pressed by the upper clamp, the supporting body can evenly support the curved elastic pad portion at the bottom.

[0015] According to an embodiment of the present invention, a curved display device, a stacking device and a method thereof, by configuring an independently controlled heating unit in the central area of the display panel, the display panel can be ironed to avoid wrinkles, and the fluidity of the optical adhesive layer can be improved so that it can be evenly filled into the edge curved area of the protective cover.

[0016] According to an embodiment of the present invention, a curved display device, a stacking device and a method thereof are configured so that an independently controlled heating unit is arranged in the edge area of the display panel, so that the edge area of the display panel that is joined to at least a portion of the edge bending area of the protective cover plate achieves surface contact and avoids line contact, so that the inner surface thereof can be better filled with the optical adhesive layer, and the possibility of bubbles between the optical adhesive layer and the edge bending area after joining can be effectively reduced.

[0017] According to an embodiment of the present invention, a curved display device, a stacked device and a method thereof, when an independently controlled heating unit is independently configured in the form of a metal heating wire or a metal heating plate, due to its own small size and small space occupation, it is easy to be configured in a curved manner on the curved elastic pad portion of the pad unit, and can be disassembled and assembled on the curved elastic pad portion, so it does not affect the overall structural design of the pad unit, and various structural changes can be made to the curved elastic pad portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a partial cross-sectional view of a display device according to an embodiment of the present invention.

[0019] Figure 2 It shows Figure 1 A cross-sectional view of the display panel is shown.

[0020] Figure 3 This is a diagram of a stacked device for a display device according to one embodiment of the present invention.

[0021] Figure 4 yes Figure 3 sectional view of .

[0022] Figure 5 It shows Figure 4 Figure 2 shows the CAE analysis results for high-curvature stacking.

[0023] Figures 6 to 8 This is a graph showing the room-temperature adhesive strength, high-temperature adhesive strength, and the modulus and cohesive force corresponding to the temperature when an acrylic optical adhesive is used.

[0024] Figure 9 This is a perspective view of a stacking device for a display device according to another embodiment of the present invention.

[0025] Figures 10 to 13 1 and 2 are diagrams of pad units according to first to fourth modified examples of another embodiment of the present invention.

[0026] Figure 14 FIG. 1 is a structural diagram of a control device for a stacking device for a display device according to another embodiment of the present invention.

[0027] Figure 15A as well as Figure 15B Each of them is a flowchart showing a method for controlling a stacking device for a display device according to another embodiment of the present invention.

[0028] Figure 16 It shows Figure 15B Flowchart of the predictive defect control method.

[0029] Description of Reference Signs

[0030] 110: Upper fixture; 111: Fixing unit; 130: Pad unit; 135: Independently controlled heating unit; 131: Curved elastic pad unit; 133: Support body; 150: Lower fixture; 170: Control device; 180: Cooling device; 210: Protective cover; 220: Optical adhesive layer; 230: Display panel DETAILED DESCRIPTION

[0031] The aforementioned background technology is technical information retained by the inventor in order to derive the present invention or obtained in the process of deriving the present invention. It is not necessarily the known technology disclosed to the general public before the application of the present invention.

[0032] The present invention can be modified in many ways and can have many embodiments. Specific embodiments are illustrated in the accompanying drawings and described in detail in the specific embodiments. Figure 1 The following embodiments will clarify the effects, features, and methods of implementing the present invention. However, the present invention is not limited to the following embodiments, but can be implemented in various forms.

[0033] In the following embodiments, terms such as "first" and "second" are not intended to be limiting; they are used to distinguish one component from another. Furthermore, unless the context clearly indicates a different meaning, a singular term encompasses the plural term. Furthermore, terms such as "including" or "having" indicate the presence of the features or components described in the specification and do not preclude the possibility of the addition of one or more other features or components.

[0034] Furthermore, the sizes of the components in the drawings are exaggerated or reduced for the sake of convenience. For example, the sizes and thicknesses of the components shown in the drawings are arbitrarily shown for the sake of convenience, and the present invention is not necessarily limited to the drawings.

[0035] In the following embodiments, the x-axis, y-axis, and z-axis are not limited to the three axes in a rectangular coordinate system, but can be interpreted as having a broad meaning including the three axes. For example, although the x-axis, y-axis, and z-axis can be orthogonal to each other, they can also refer to different directions that are not orthogonal to each other.

[0036] When a certain embodiment can be implemented in different ways, the specific process order can be performed differently from the order described. For example, two processes described in succession can be performed substantially simultaneously, or in the reverse order of the order described.

[0037] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same or corresponding components will be given the same reference numerals, and repeated descriptions thereof will be omitted.

[0038] Figure 1 This is a cross-sectional view showing a portion of a display device manufactured using a stacking device according to an embodiment of the present invention. Figure 2 It shows Figure 1 A cross-sectional view of the display panel is shown.

[0039] Figure 1 and Figure 2 The display device 200 shown may be composed of Figure 3 The stacking device 100 according to one embodiment of the present invention is manufactured.

[0040] like Figure 1 and Figure 2 As shown, the display device 200 may have a protective cover 210 and a film member (not shown).

[0041] The protective cover 210 can be formed as a curved surface with multiple radii of curvature. For example, the protective cover 210 can be formed by a first curved surface, a second curved surface, and a third curved surface. The first curved surface has a first curvature radius R1 in the length direction or width direction, the second curved surface has a second curvature radius R2, and the third curved surface has a third curvature radius R3. In this case, in addition to the curved surfaces with curvature radii R1 to R3, the protective cover 210 can also include multiple curved surfaces with curvature radii R4, R5, ..., Rn (where n is a natural number greater than 0).

[0042] Furthermore, the protective cover 210 can be formed into a curved surface having a predetermined radius of curvature. For example, the protective cover 210 can be formed into a curved surface having a predetermined radius of curvature R. Furthermore, the protective cover 210 can include a curved region having a curvature radius and a flat region formed flatly. For ease of explanation, the following description focuses on a case where the protective cover 210 is formed into a curved surface having a predetermined radius of curvature R at both ends.

[0043] In addition, the film member can be formed in various ways. For example, the film member can include at least one of a touch screen panel (not shown), a display panel 230, an optically clear adhesive layer (OCA, Optically Clear Adhesive film, 220), a black matrix film (not shown), and a release paper (not shown).

[0044] At this time, the touch screen panel is the same as or similar to a general touch screen panel, so a detailed description will be omitted. The display panel 230 may include a flexible organic light-emitting display panel, a liquid crystal display panel, and the like. Furthermore, the optical adhesive layer 220 may be disposed between the display panel 230 and the protective cover plate 210, and the optical adhesive layer 220 may be adhered to the display panel 230 using the laminating device 100 before the display panel 230 is adhered. In addition, the optical adhesive layer 220 may be made while being adhered to the protective cover plate 210 or the display panel 230. Furthermore, the black matrix film may be in a state where a black matrix is printed on the adhesive film. The release paper may be a film that is adhered to the protective cover plate 210 to protect the protective cover plate 210. At this time, the film member may be formed in a flexible manner. Below, for ease of explanation, the description will be centered on the case where the protective cover plate 210 is pressed by the laminating device 100 and adhered to the display panel 230 consisting of a flexible film member using the optical adhesive layer 220 as a medium. In particular, the detailed description will be focused on the case where the display panel 230 is an organic light emitting display panel.

[0045] The display panel 230 made of the flexible film member described above can be attached to the convex or concave surface of the protective cover 210. For ease of explanation, the following description focuses on the case where the display panel 230 made of the flexible film member is attached to the concave surface of the protective cover 210.

[0046] The display panel 230 may include the light emitting portion formed on a first substrate S. In this case, the light emitting portion includes a thin film transistor (TFT) and a passivation film 231 covering the thin film transistor. An organic light emitting element 238 may be formed on the passivation film 231 .

[0047] In this case, the first substrate S can be made of glass, but is not limited thereto. It can also be made of plastic or metal such as SUS or Ti. Furthermore, the first substrate S can be made of polyimide (PI). For ease of explanation, the following detailed description focuses on the case where the first substrate S is made of polyimide.

[0048] A buffer layer 232 composed of organic compounds and / or inorganic compounds is further formed on the upper surface of the first substrate S, which can be formed as SiO x (x≥1), SiN x (x≥1).

[0049] After forming an active layer 233 arranged in a predetermined pattern on the buffer layer 232, the active layer 233 is buried with a gate insulating layer 234. The active layer 233 includes a source region 233a and a drain region 233c, and further includes a channel region 233b between the source region 233a and the drain region 233c.

[0050] Such an active layer 233 can be formed to contain a variety of substances. For example, the active layer 233 can contain an inorganic semiconductor substance such as amorphous silicon or crystalline silicon. As another example, the active layer 233 can contain an oxide semiconductor. As another example, the active layer 233 can contain an organic semiconductor substance. However, for ease of explanation, the following detailed description focuses on the case where the active layer 233 is formed of amorphous silicon.

[0051] Such an active layer 233 can be formed by forming an amorphous silicon film on the buffer layer 232, crystallizing the amorphous silicon film to form a polysilicon film, and patterning the polysilicon film. The active layer 233 has a source region 233a and a drain region 233c doped with impurities depending on the type of TFT, such as a driving TFT (not shown) or a switching TFT (not shown).

[0052] A gate electrode 235 corresponding to the active layer 233 and an interlayer insulating layer 236 filling the gate electrode 235 are formed on the upper surface of the gate insulating layer 234 .

[0053] In addition, after contact holes are formed in the interlayer insulating layer 236 and the gate insulating layer 234, a source electrode 237a and a drain electrode 237b are formed on the interlayer insulating layer 236 so that the source electrode 237a and the drain electrode 237b can contact the source region 233a and the drain region 233c respectively. The source electrode 237a contacts the source region 233a of the active layer 233 through the via H1 formed in the TFT.

[0054] A passivation film 231 is formed on the upper portion of the thin film transistor TFT formed in this manner, and a pixel electrode 238a of an organic light-emitting element 238 is formed on the upper portion of the passivation film 231. The pixel electrode 238a contacts the drain electrode 237b of the TFT through a via H2 formed in the passivation film 231. The passivation film 231 can be formed of an inorganic and / or organic substance and formed into a single layer or two or more layers. The passivation film 231 can be formed into a planarization film regardless of the curvature of the lower film so that its upper surface is formed flat. On the other hand, it can also be formed in a manner that has a curvature as the film located below is curved. In addition, the passivation film 231 is preferably formed of a transparent insulator so as to achieve a resonance effect.

[0055] After forming the pixel electrode 238 a on the passivation film 231 , a pixel definition film 239 is formed using organic and / or inorganic materials to cover the pixel electrode 238 a and the passivation film 231 . The pixel definition film 239 is opened to expose the pixel electrode 238 a .

[0056] In addition, an intermediate layer 238 b and an opposing electrode 238 c are formed at least on the pixel electrode 238 a .

[0057] The pixel electrode 238 a functions as an anode electrode, and the counter electrode 238 c functions as a cathode electrode. Of course, the polarities of the pixel electrode 238 a and the counter electrode 238 c may be opposite.

[0058] The pixel electrode 238 a and the counter electrode 238 c are insulated from each other by the intermediate layer 238 b , and the organic light emitting layer emits light by applying voltages of different polarities to the intermediate layer 238 b .

[0059] The intermediate layer 238b may include an organic light-emitting layer. As another optional example, the intermediate layer 238b may include an organic light-emitting layer and may also include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (ETL). This embodiment is not limited to this; the intermediate layer 238b may include an organic light-emitting layer and may also include various other functional layers.

[0060] Furthermore, a unit pixel is composed of multiple sub-pixels, and the multiple sub-pixels can emit light of multiple colors. For example, the multiple sub-pixels can include sub-pixels that emit red, green, and blue light, or sub-pixels that emit red, green, blue, and white light.

[0061] The plurality of sub-pixels described above may include an intermediate layer 238b having organic light-emitting layers that emit light of multiple colors, for example, the plurality of sub-pixels include an intermediate layer 238b having organic light-emitting layers that emit light of red, green, and blue.

[0062] As another example, a plurality of sub-pixels emitting multiple colors may include an intermediate layer 238b having an organic light-emitting layer emitting the same light, such as white light, and a color converting layer or color filter that converts the white light into light of a predetermined color.

[0063] The intermediate layer 238b emitting the white light may have various structures. For example, the intermediate layer 238b may include a structure in which at least a light-emitting substance emitting red light, a light-emitting substance emitting green light, and a light-emitting substance emitting blue light are stacked.

[0064] As another example for emitting the white light, the intermediate layer 238b may include a structure in which at least a light-emitting substance emitting red light, a light-emitting substance emitting green light, and a light-emitting substance emitting blue light are mixed.

[0065] The red, green, and blue colors are merely examples, and the present embodiment is not limited thereto. That is, as long as white light can be emitted, in addition to the combination of red, green, and blue, other combinations of colors can also be used.

[0066] In addition, the display panel 230 may further include a thin film encapsulation layer. The thin film encapsulation layer may include a plurality of inorganic layers, or include an inorganic layer and an organic layer.

[0067] The organic layer of the thin film encapsulation layer can be formed from a polymer, preferably a single layer or a laminated film formed from one of polyethylene terephthalate, polyimide, polycarbonate, epoxy, polyethylene, and polyacrylate. More preferably, the organic layer can be formed from a polyacrylate, specifically, a monomer composition formed by polymerizing a monomer composition including a diacrylate monomer and a triacrylate monomer. The monomer composition may also include a monoacrylate monomer. Furthermore, the monomer composition may further include a known photoinitiator such as TPO, but is not limited to this.

[0068] The inorganic layer of the thin film encapsulation layer may be a single layer film or a stacked film including a metal oxide or a metal nitride.

[0069] Specifically, the inorganic layer may include SiN x , one of Al2O3, SiO2, and TiO2.

[0070] The uppermost layer exposed to the outside among the thin film encapsulation layers may be formed of an inorganic layer to prevent moisture permeation to the organic light emitting element 238 .

[0071] The thin film encapsulation layer may include at least one first sandwich structure, wherein the first sandwich structure is a structure in which at least one organic layer is inserted between at least two inorganic layers. As another example, the thin film encapsulation layer may include at least one second sandwich structure, wherein the second sandwich structure is a structure in which at least one inorganic layer is inserted between at least two organic layers. As yet another example, the thin film encapsulation layer may further include a first sandwich structure in which at least one organic layer is inserted between at least two inorganic layers, and a second sandwich structure in which at least one inorganic layer is inserted between at least two organic layers.

[0072] The thin film encapsulation layer may include a first inorganic layer, a first organic layer, and a second inorganic layer in order from the upper portion of the organic light emitting element 238 .

[0073] As another example, the thin film encapsulation layer may include a first inorganic layer, a first organic layer, a second inorganic layer, a second organic layer, and a third inorganic layer in order from the upper portion of the organic light emitting element.

[0074] As another example, the thin film encapsulation layer may include a first inorganic layer, a first organic layer, a second inorganic layer, the second organic layer, a third inorganic layer, a third organic layer, and a fourth inorganic layer in sequence from the upper portion of the organic light emitting element.

[0075] A metal halide layer containing LiF may be further included between the organic light emitting element and the first inorganic layer. The metal halide layer can prevent the organic light emitting element from being damaged when the first inorganic layer is formed by sputtering.

[0076] The area of the first organic layer may be narrower than that of the second inorganic layer, and the area of the second organic layer may also be narrower than that of the third inorganic layer.

[0077] As another example, the first organic layer may be formed to be completely covered by the second inorganic layer, and the second organic layer may also be formed to be completely covered by the third inorganic layer.

[0078] Figure 3 This is a photograph of a stacked device for a display device according to an embodiment of the present invention. Figure 4 This is a cross-sectional view of a stacked device for a display device according to an embodiment of the present invention.

[0079] Reference Figure 3 and Figure 4 The curved surface lamination apparatus 100 for a display device according to an embodiment of the present invention includes an upper jig 110 , a pad unit 130 , and a lower jig 150 disposed in a vacuum chamber 100 a .

[0080] The upper fixture 110 includes a fixing portion 111 for vacuum adsorption and fixing the protective cover 210. The fixing portion 111 includes multiple air holes and is connected to a vacuum pump, thereby vacuum adsorbing the protective cover 210. The upper fixture 110 may include a moving portion 113 for moving the protective cover 210 fixed to the fixing portion 111.

[0081] The pad unit 130 includes a curved elastic pad portion 131. The curved elastic pad portion 131 faces the fixing portion 111. The curved elastic pad portion 131 is configured to support the display panel 230 having the optical adhesive layer 220.

[0082] The upper jig 110 and the pad unit 130 are configured to bond the display panel 230 and the protective cover 210 via the optical adhesive layer 220 .

[0083] The pad unit 130 may be disposed on the lower jig 150. The pad unit 130 may include a curved elastic pad portion 131 and first to fourth pad side surfaces 133a, 133b, 133c, and 133d bent and extended from the curved elastic pad portion 131.

[0084] When the upper jig 110 and the lower jig 150 are moved in a vertical direction and coupled to each other to apply pressure, the shape of the pad unit 130 can be easily deformed to correspond to the curved shape of the protection cover 210 .

[0085] The curved elastic pad portion 131 of the pad unit 130 may have a protruding shape protruding from the lower jig 150 toward the upper jig 110 .

[0086] The material of the pad unit 130 is not limited to any one material as long as its shape can be easily deformed and restored.

[0087] The lower jig 150 may be disposed below the upper jig 110 and support the pad unit 130. The lower jig 150 may move the pad unit 130 toward the upper jig 110 or move the pad unit 130 away from the upper jig 110.

[0088] The lower jig 150 and the pad unit 130 may move in the left-right direction.

[0089] In addition, the carrier film supply unit 120 may be included between the lower jig 150 and the upper jig 110 in a manner offset from the pad unit 130 , and the carrier film supply unit 120 is used to supply the carrier film 300 attached with the display panel 230 to the pad unit 130 .

[0090] The carrier film supply unit 120 can move toward or away from the pad unit 130. To this end, the carrier film supply unit 120 can further include a roller so that the carrier film 300 can be wound around or unwound from the roller during movement toward or away from the pad unit 130. However, the present invention is not limited thereto, and the roller can be omitted.

[0091] A heating unit 135 is provided below the curved elastic pad portion 131 of the pad unit 130 . The heating unit 135 can be provided in at least a portion of the planar area 211 and the edge bending area 212 of the protective cover 210 to allow the curved elastic pad portion 131 of the pad unit 130 to generate heat itself.

[0092] The protective cover plate 210 and the display panel 230 are bonded together by moving the lower clamp 150 upward or the upper clamp 110 downward so that the protective cover plate 210 and the display panel 230 are brought close to each other. During the bonding process, the curved elastic pad portion 131 of the pad unit 130 having the heating unit 135 can be used to heat the optical adhesive layer 220, thereby improving the fluidity of the optical adhesive layer 220 for bonding.

[0093] Figure 5 It shows Figure 4 Figure 2 shows the CAE analysis results for high-curvature stacking.

[0094] Computer-Aided Engineering (CAE) uses a computer to display the results of confirming the fatigue durability between the protection cover 210 and the display panel 230 .

[0095] like Figure 5 As shown, when the protective cover plate 210 is bonded to the display panel 230 using the optical adhesive layer 220, it can be confirmed that the optical adhesive layer 220 produces line contact in the edge bending area 212 of the protective cover plate 210, and poor bonding problems such as optical adhesive wear, bending or stress concentration (buckling), demolding, and bubbles occur.

[0096] Figures 6 to 8 This is a graph showing the room-temperature adhesive strength, high-temperature adhesive strength, and the modulus and cohesive force corresponding to temperature when an acrylic optical adhesive is used in the optical adhesive layer.

[0097] like Figure 6 and Figure 7As shown, when the protective cover 210 is bonded to the display panel 230 using an optical adhesive layer 220, a transparent acrylic optical adhesive is mostly used as the optical adhesive layer 220. The acrylic optical adhesive requires a load of about 1760 gf when stretched by about 10 mm to 20 mm at room temperature, and requires a load of about 460 gf when stretched by about 10 mm to 20 mm at high temperature.

[0098] That is, when an acrylic optical adhesive is used as the optical adhesive layer 220 , the adhesive strength at high temperature is lower than the adhesive strength at room temperature.

[0099] And, as Figure 8 As shown, when an acrylic optical adhesive is used as the optical adhesive layer 220, the storage modulus and loss modulus of the optical adhesive layer 220 are measured according to the temperature. As the temperature approaches high, both the storage modulus and the loss modulus decrease, so it can be confirmed that the modulus decreases and the cohesion decreases.

[0100] According to the material and physical properties of the optical adhesive layer 220 , when the protective cover 210 is bonded to the display panel 230 using the optical adhesive layer 220 according to temperature, the temperature of the curved elastic pad portion 131 of the pad unit 130 needs to be selectively or independently controlled.

[0101] Next, refer to Figures 9 to 15B A stacking device and method for a display device according to another embodiment of the present invention will be described.

[0102] Figure 9 FIG. 1 is a perspective view of a main portion of a stacking device for a display device according to another embodiment of the present invention. Figures 10 to 12 Along the Figure 9 The cross-sectional view taken along line AA of the Figure 13 yes Figure 9 A top view of Figure 14 FIG. 1 is a structural diagram of a control device for a stacking device for a display device according to another embodiment of the present invention. Figure 14 This is a flowchart illustrating a method for controlling a stacking device for a display device according to another embodiment of the present invention.

[0103] First refer to Figure 9 Similar to the display device lamination apparatus 100 according to the first embodiment of the present invention, a display device lamination apparatus 100 ′ includes an upper jig 110 , a pad unit 130 , and a lower jig 150 disposed in a vacuum chamber 100 a .

[0104] Furthermore, similar to the display device stacking device 100 of one embodiment of the present invention, the upper clamp 110 includes a fixing portion 111 for vacuum adsorption and fixing the protective cover plate 210. The fixing portion 111 includes multiple air holes and is connected to a vacuum pump, so that the protective cover plate 210 can be vacuum adsorbed.

[0105] In another embodiment of the present invention, a stacking device 100' for a display device can configure a pad unit 130' on a lower fixture 150. The pad unit 130' may include: a curved elastic pad portion 131'; a support body 133', which is configured to be detachable from the curved elastic pad portion 131'; and an independently controlled heating unit 135', which can be selectively set on the curved elastic pad portion 131'.

[0106] Since the pad unit 130' is divided into the curved elastic pad portion 131' and the supporting body 133', the independently controlled heating unit 135' can be selectively set on the curved elastic pad portion 131' and can also be easily replaced. When the protective cover 210 is pressed by the upper clamp 110, the supporting body 133' can support the curved elastic pad portion 131' at the bottom in a manner that uniformly presses the curved elastic pad portion 131' toward the top.

[0107] The supporting body 133 ′ may include first to fourth pad side surfaces 133 a , 133 b , 133 c , and 133 d that are bent and extended downward from the curved elastic pad portion 131 ′.

[0108] The first to fourth pad sides 133a, 133b, 133c, 133d can be composed of first and second pad sides 133a, 133b and third and fourth sides 133c, 133d facing each other. Generally speaking, the first and second pad sides 133a, 133b can have long sides, and the third and fourth sides 133c, 133d have short sides.

[0109] When the upper jig 110 and the lower jig 150 move in the vertical direction and press each other, the shape of the curved elastic pad portion 131 ′ can be easily deformed to correspond to the curved shape of the protection cover 210 .

[0110] The curved elastic pad portion 131 ′ may have a convex shape protruding in a direction from the lower jig 150 toward the upper jig 110 .

[0111] The material of the curved elastic pad portion 131 ′ is not limited to any one material as long as its shape can be easily deformed and restored.

[0112] The lower fixture 150 can be disposed below the upper fixture 110 and supports the pad unit 130. The lower fixture 150 includes a base plate 151 integrally configured with or securely fixed to a support body 133' of the pad unit 130; a vertical driving portion 153 for vertically driving the base plate 151; and a fixing plate 155 for fixedly supporting the vertical driving portion 153.

[0113] The up-and-down driving unit 153 can move the lower fixture 150 toward the upper fixture 110 , or move the lower fixture 150 away from the upper fixture 110 .

[0114] The stacking device 100' for a display device according to another embodiment of the present invention may further include: a control device 170 for controlling the power supply and temperature of an independently controlled heating unit 135', wherein the independently controlled heating unit 135' is configured to cause the curved elastic pad portion 131' of the pad unit 130' to generate heat itself; and a local cooling device 180, which is linked to the control device 170 and locally performs rapid cooling on the independently controlled heating unit 135' according to the material and characteristics of the display panel 230 or the optical adhesive layer 220.

[0115] Figures 10 to 12 The pad unit of the first to third modified examples of another embodiment of the present invention is along Figure 9 The cross-sectional view taken along line AA of the Figure 13 FIG. 1 is a top view of a pad unit according to a fourth modified example of another embodiment of the present invention.

[0116] Reference Figures 10 to 12 In the first to third modified examples of another embodiment of the present invention, the independently controlled heating unit 135 of the pad unit may be in the form of a metal sheet, a metal tube, or a metal block.

[0117] Reference Figure 10 The curved elastic pad portion 131' of the pad unit 130' includes a corner region 1311 and a central region 1312. The corner regions 1311 of the curved elastic pad portion 131' are connected to the central region 1312. The central region 1312 is provided between two adjacent corner regions 1311.

[0118] The corner area 1311 is configured to fix the edge bending area 212 of the protective cover 210 (see Figure 5 ).

[0119] The central region 1312 may further include protruding support portions 133aa, 133ba, 133ca, and 133da protruding from the first to fourth pad side surfaces 133a, 133b, 133c, and 133d.

[0120] The protruding support portions 133 aa , 133 ba , 133 ca , and 133 da are made of a material with greater rigidity and are approximately in the shape of a rectangular box, so that the planar area 211 of the protective cover 210 can be more flatly arranged in the central area 1312 .

[0121] like Figure 11 As shown, in a cross-sectional view of a pad unit 130" according to a second modified example of another embodiment of the present invention, a heating unit 135' can be provided in the protruding support portions 133aa, 133ba, 133ca, and 133da protruding from the first to fourth pad side surfaces 133a, 133b, 133c, and 133d, corresponding to the central area 1312 of the curved elastic pad portion 131'.

[0122] When the heating unit 135' is disposed in the protruding support portions 133aa, 133ba, 133ca, and 133da protruding from the first to fourth pad sides 133a, 133b, 133c, and 133d, an ironing effect can be provided to prevent wrinkles from forming on the portion of the display panel 230 corresponding to the plane area 211 of the protection cover 210.

[0123] Furthermore, during the process of bonding the display panel 230 to the flat region 211 of the protective cover 210 , the fluidity of the optical adhesive layer 220 is improved so that the optical adhesive layer 220 can extend toward the edge bending region 212 of the protective cover 210 .

[0124] Furthermore, during the process of bonding the display panel 230 to the edge bending region 212 of the protective cover 210 , since the optical adhesive layer 220 is not heated, the optical adhesive layer 220 can have better adhesive force.

[0125] like Figure 12 As shown, in the cross-sectional view of the pad unit 130" of the third variant of another embodiment of the present invention, the heating unit 135" can be arranged at the edge of the protruding support portions 133aa, 133ba, 133ca, and 133da protruding from the first to fourth pad side surfaces 133a, 133b, 133c, and 133d corresponding to the corner area 1311 of the curved elastic pad portion 131'.

[0126] When the heating unit 135" is locally provided at the edges of the protruding support portions 133aa, 133ba, 133ca, and 133da protruding from the first to fourth pad side surfaces 133a, 133b, 133c, and 133d, the edge of the display panel 230 corresponding to the edge bending region 212 of the protective cover plate 210 is heated. Therefore, the edge portion of the heated display panel 230 forms a curved surface corresponding to the edge bending region 212, thereby avoiding line bonding of the optical adhesive layer 220 and enabling better surface bonding.

[0127] Furthermore, during the process of bonding the display panel 230 to the planar area 211 of the protective cover plate 210, although the bubbles generated are trapped in the edge bending area 212 of the protective cover plate 210 and are not easy to escape, the edge of the display panel 230 corresponding to the edge bending area 212 of the protective cover plate 210 is heated, so that the adhesion of the optical adhesive layer 220 is reduced, so that the edge bending area 212 of the protective cover plate 210 and the edge of the display panel 230 are slowly bonded, thereby effectively reducing the possibility of bubbles existing between the optical adhesive layer 220 and the edge bending area 212 after bonding.

[0128] Figure 13 FIG. 1 is a top view of a pad unit according to a fourth modified example of another embodiment of the present invention.

[0129] like Figure 13 As shown, the independently controlled heating unit 135'' can be a metal heating wire.

[0130] like Figure 13 As shown in part (a), the independently controlled heating units 135'' may be first metal heating wires 135a independently and discretely configured on the curved elastic pad portion 131' of the pad unit 130'.

[0131] The independently controlled heating unit 135'' may include a second metal heating wire 135b formed by metal heating wires being arranged in a mesh shape by crossing in the x-axis direction and the y-axis direction.

[0132] Furthermore, in the x-axis direction or the y-axis direction, the metal heating wires can be arranged more closely or more distantly.

[0133] And, as Figure 13As shown in part (b), the independently controlled heating unit 135''s third metal heating wire 135c in the shape of a closed curve can be concentrically arranged in the curved elastic pad portion 131' of the pad unit 130'. The closed curve shape can be an ellipse, and ellipses with different major axes are arranged in the x-axis direction or the y-axis direction. The independently controlled heating unit 135'' can also include a fourth metal heating wire 135d, and the fourth metal heating wire 135d is independently arranged in the corner area 1311 of the curved elastic pad portion 131' of the pad unit 130' and is independently controlled.

[0134] In the case where the heating unit 135 ′″ is independently configured in the form of a metal heating wire or a metal heating sheet, it can be sewn and combined with the curved elastic pad portion 131 ′.

[0135] When the heating unit 135'' is independently configured in the form of a metal heating wire or a metal heating plate, due to its small size and small space occupation, it can be easily configured in a curved manner on the curved elastic pad portion 131' of the pad unit 130' and can be detached from the curved elastic pad portion 131'. Therefore, it does not affect the overall structural design of the pad unit 130', and various structural changes can be made to the curved elastic pad portion 131'.

[0136] Figure 14 This is a structural diagram of a control device for a stacking device for a curved display device according to an embodiment of the present invention.

[0137] like Figure 14 As shown, in the stacking device 100 ′ for a display device according to an embodiment of the present invention, the control device 170 includes: a control processing unit 171 , a power detection unit 172 , a power switching unit 173 , a driving unit 174 , a current regulating unit 175 , a temperature detection unit 176 , and a cooling switching unit 177 .

[0138] The temperature detection unit 176 may be, for example, a temperature sensor.

[0139] The power supply is detected by the power supply detection unit 172 , and according to the control of the control processing unit 171 , the power supply switching unit 173 can switch the input of the AC power supply on and off.

[0140] The temperature detecting unit 176 detects the temperature of each of the first to fourth metal heating wires 135 a , 135 b , 135 c , and 135 d of the heating unit 135 ″ and inputs a temperature detection signal to the control processing unit 171 .

[0141] The driving unit 174 controls the current regulating unit 175 based on the control signal applied from the control processing unit 171, converts the control signal applied from the control processing unit 171 into a voltage required to drive the current regulating unit 175, and applies the voltage as a drive control signal to the current regulating unit 175. The current regulating unit 175 is driven based on the control signal applied by the driving unit 174, and can adjust the current applied to the independently controlled heating unit 135'' consisting of the first to fourth metal heating wires 135a, 135b, 135c, and 135d.

[0142] The control processing unit 171 is implemented by a microprocessor and controls the overall drive of the heating unit 135'' of the pad unit 130' according to a built-in program. The built-in analog / digital conversion unit is used to convert the voltage and phase detection signal applied from the power detection unit 172 into a digital signal and confirm the voltage and phase of the power supply. The built-in analog / digital conversion unit is used to convert the temperature detection signal applied from the temperature detection unit 176 into a digital signal and confirm the temperature. Thus, a control signal is output to the driving unit 174 side to adjust the current of the independent heating unit 135'' independently configured in the edge bending area 1311 and the plane area 1312 of the curved elastic pad part 131' of the pad unit 130'.

[0143] The control processing unit 171 uses the temperature detection unit 176 to independently sense the temperature signals applied from the independently controlled heating unit 135″′ composed of the first to fourth metal heating wires 135a, 135b, 135c, and 135d corresponding to the respective temperatures of the first to fourth metal heating wires 135a, 135b, 135c, and 135d to confirm the respective temperatures of the first to fourth metal heating wires 135a, 135b, 135c, and 135d, while driving the current regulation unit 175 to maintain the set temperature, thereby controlling to maintain the set temperature.

[0144] The current regulating unit 175 may be implemented by a silicon controlled rectifier (SCR), which is implemented by two first SCR1175a and a second SCR2175b disposed at both ends of each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d.

[0145] The first SCR1175a and the second SCR2175b use gate terminals to receive control signals applied from the control processing unit 171 through the driving unit 174, and adjust the amount of current supplied to each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d according to the control signals input to the corresponding gate terminals.

[0146] The temperature detection unit 176 is composed of a first temperature detection unit 176a and a second temperature detection unit 176b. The first temperature detection unit 176a detects the temperature of the first metal heating wire 135a that receives current supply through the first SCR1175a and inputs it to the control processing unit 171. The second temperature detection unit 176b detects the temperature of the second metal heating wire 135b that receives current supply through the second SCR2175b and inputs it to the control processing unit 171.

[0147] The first and second temperature detection units 176a and 176b can be composed of a resistor that determines the current value of the temperature signal, a Zener diode that limits the voltage applied to the control processing unit 171 to prevent it from exceeding a specified DC value, and a capacitor that smoothes the sinusoidal waveform of the applied temperature signal.

[0148] When the temperature detecting unit 176 detects the temperature and inputs it to the control processing unit 171 , the cooling switching unit 177 can operate the cooling devices 180 a and 180 b under the control of the control processing unit 171 , thereby cooling the first and second metal heating wires 135 a and 135 b , respectively.

[0149] Next, refer to Figure 15A as well as Figure 15B A stacking method for a curved display device according to an embodiment of the present invention will be described in detail.

[0150] like Figure 15A As shown, a stacking method for a curved display device according to another embodiment of the present invention includes: step S10, providing a protective cover 210 by using an upper clamp 110, wherein the protective cover 210 includes a middle plane area 211 and an edge curved area 212 around the plane area 211; step S20, providing a pad unit 130 arranged below the upper clamp 110 by using a lower clamp 150; step S30, providing a display panel 230 having an optical adhesive layer 220 on the pad unit 130 arranged below the upper clamp 110; step S40, moving the upper clamp 110 or the lower clamp 150 in a direction perpendicular to the pad unit 130, and using the optical adhesive layer 220 as a medium to join the protective cover 210 below the upper clamp 110 and the display panel 230 on the pad unit 130 arranged on the lower clamp 150.

[0151] In step S40 of bonding the protective cover 210 and the display panel 230 using the optical adhesive layer 220 as a medium, the following may also be included: step S50, heating the central area of the display panel 230 corresponding to the planar area 211 of the protective cover 210 to stretch it; step S60, utilizing the heat transferred in step S50 of stretching the central area of the display panel 230 by heating it to locally increase the fluidity of the optical adhesive layer 220 arranged on the central area of the display panel 230 to form a curved area.

[0152] like Figure 15B As shown, in the step S40 of bonding the protective cover 210 and the display panel 230 using the optical adhesive layer 220, it can include: step S50', heating the edge area of the display panel 230 corresponding to the edge bending area 212 of the protective cover 210 to form a curved area; step S60', heating the edge area of the display panel 230 to heat the optical adhesive layer 220 configured on the edge area of the display panel 230 to slow down the bonding speed; predicted defect removal step S80', compared with the bonding of the flat area 211 of the protective cover 210 and the central area of the display panel 230, slowing down the bonding of the edge area of the display panel 230 and the edge area of the display panel 230, and using the pressure of the edge area of the display panel 230 and the edge area of the display panel 230 (S70') to slowly and completely remove the bubbles trapped in the edge bending area 212.

[0153] Therefore, the edge area of the display panel 230 that is joined to at least a portion of the edge bending area 212 of the protective cover plate 210 achieves surface contact and avoids line contact, so that the optical adhesive layer 220 can be better filled on its inner surface, and the possibility of bubbles between the optical adhesive layer 220 and the edge bending area 212 after joining can be effectively reduced.

[0154] Next, refer to Figure 16 A stacking method for a curved display device according to an embodiment of the present invention will be described in detail.

[0155] like Figure 16 As shown, another embodiment of the stacking method for a curved display device of the present invention includes: when the upper clamp 110 or the lower clamp 150 is moved in a direction perpendicular to the upper clamp 110 or the lower clamp 150 to join the protective cover 210 under the upper clamp 110 and the display panel 230 arranged on the lower clamp 150, a method S80 of controlling the predicted defect caused by the line contact of the optical adhesive layer 220.

[0156] When the protective cover plate 210 and the display panel 230 are bonded, the method S80 for controlling the predicted failure caused by the line contact of the optical adhesive layer 220 may include: step S81, setting the adjustment values of the time, temperature, bonding strength, etc. for bonding the protective cover plate 210 and the display panel 230 in consideration of the curved surface shape, material, physical properties, etc. of the protective cover plate 210, the optical adhesive layer 220 and the display panel 230; step S82, corresponding to the curved surface shape, material, physical properties and predicted failure of the protective cover plate 210, the optical adhesive layer 220 and the display panel 230, driving each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d arranged in the plane area 211 and the edge bending area 212 of the protective cover plate 210 in an independent selection mode.

[0157] The method may include: step S83 , determining whether the set temperatures corresponding to the plane area 211 and the edge bending area 212 of the protective cover 210 are reached for each of the first to fourth metal heating wires 135 a , 135 b , 135 c , and 135 d .

[0158] It may include: when it is determined that the set temperature corresponding to the plane area 211 and the edge bending area 212 of the protective cover 210 has not been reached, the step of changing each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d in the step S82 of driving in the independent selection mode.

[0159] The method may include: step S84, when it is determined that the set temperature corresponding to the plane area 211 and the edge bending area 212 of the protective cover 210 is reached, independently cutting off the current for each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d.

[0160] When it is determined that the temperature is greater than the set temperature corresponding to the flat area 211 and the edge bending area 212 of the protective cover 210 , the temperature may be instantaneously controlled by the cooling device 180 (step S84 - 2 ).

[0161] The method may include: step S86, when it is determined that the temperature is lower than the set temperature corresponding to the flat area 211 and the edge curved area 212 of the protective cover 210 (step S85), applying current to each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d independently again. When it is determined that the set temperature corresponding to the flat area 211 and the edge curved area 212 of the protective cover 210 is reached (step S87), the current may be cut off again.

[0162] In step S82 of driving each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d in an independent selection mode, a drive control signal is output from the control processing unit 171 to the drive unit 174, so that each SCR of the current regulating unit 175 supplies the maximum current to the first to fourth metal heating wires 135a, 135b, 135c, and 135d.

[0163] While current is being supplied to the first to fourth metal heating wires 135a, 135b, 135c, and 135d, the control processing unit 171 can utilize the temperature detection unit 176 provided on the first to fourth metal heating wires 135a, 135b, 135c, and 135d to detect the local temperatures corresponding to the planar area 211 and the edge bending area 212 of the protective cover 210, thereby confirming whether each area has reached the set temperature.

[0164] If the set temperature is not reached, return to the above-mentioned step S82 and repeat the action. If the set temperature is reached, apply a control signal to the driving unit 174 to cut off the current supplied by the SCR of the current regulating unit 175 to prevent the temperature of each metal heating wire among the first to fourth metal heating wires 135a, 135b, 135c, and 135d from rising above the set temperature (step S84).

[0165] The control processing unit 171 selectively cuts off the supply current to each of the first to fourth metal heating wires 135a, 135b, 135c, and 135d, and confirms whether the temperature has dropped below the set temperature through the temperature detection unit 176 (step S85). If the temperature has not dropped below the set temperature, the control processing unit 171 returns to step S84 and maintains the original current cut-off state. If the temperature has dropped below the set temperature, the control processing unit 171 applies a control signal to the driving unit 174 to supply current through the SCR of the current regulating unit 175, and supplies an appropriate current that can make it reach the set temperature to increase the temperature of the heating wire (step S86). During the period of supplying current to the hot wire as described above, the control processing unit 171 confirms whether the temperature of the first to fourth metal heating wires 135a, 135b, 135c, and 135d reaches the set temperature through the temperature detection unit 176 (step S87). When the set temperature is not reached, the control processing unit 171 returns to step S86 and continues to supply current to the first to fourth metal heating wires 135a, 135b, 135c, and 135d. When the set temperature is reached, the control processing unit 171 returns to step S84 and cuts off the current supplied by the current regulation unit 175 to the first to fourth metal heating wires 135a, 135b, 135c, and 135d.

[0166] When a carrier film 300 is provided to the curved elastic pad portion 131 of the pad unit 130, the heating unit 135 inside the curved elastic pad portion 131 can be heated along the curved surface of the curved elastic pad portion 131 of the pad unit 130, so that the display panel 230 provided by the carrier film 300 is elastically deformed so that its edge forms a curved surface, thereby avoiding line contact with the edge bending area 212 of the protective cover plate 210, and can then naturally and tightly fit in the edge bending area 212 of the protective cover plate 210.

[0167] Furthermore, since a curved surface is formed on the display panel 230 before lamination between the protective cover plate 210 and the display panel 230, it is possible to prevent the surface of the display panel 230 from being excessively pressed, and to prevent the display panel 230 from being damaged due to the difference in curvature during lamination between the protective cover plate 210 and the display panel 230. In addition, the optical adhesive layer 220 between the protective cover plate 210 and the display panel 230 is also selectively temperature-regulated, thereby preventing the optical adhesive layer 220 from peeling off or generating bubbles between the protective cover plate 210 and the display panel 230, thereby increasing overall production efficiency and accelerating the lamination speed.

[0168] Since the optical adhesive layer 220 itself needs to use a highly transmittant acrylic with a light transmittance of more than 95%, and considering that the optical adhesive layer 220 has better viscosity at room temperature than at high temperature, it can be hardened while controlling the fluidity and adhesion so that it can correspond to the shape of the display panel 230 and the protective cover 210 and avoid bubbles or poor line contact.

[0169] After the protective cover 210 and the display panel 230 are bonded together, the optical adhesive layer 220 is cured.

[0170] During the bonding process of the display panel 230 and the protective cover plate 210, wrinkles and bubbles may be generated in the portion of the optical adhesive layer 220 corresponding to the inner surface of the edge bending area 212. However, by applying a tensile force to the edge portion of the display panel 230, the edge portion of the display panel 230 is bent toward the pad unit 130, thereby ensuring that the shape of the display panel 230 matches the shape of the protective cover plate 210.

[0171] The portion of the optical adhesive layer 220 corresponding to the middle portion of the display panel 230 may first contact and bond with the middle planar region 211 of the protective cover 210 , and then release the edge portion of the display panel 230 , thereby pulling the film and ending.

[0172] The edge portion of the display panel 230 has a stretchable restoring force.

[0173] Under the action of its own elastic restoring force, the edge portion of the display panel 230 drives the corresponding optical adhesive layer 220 to approach the edge bending area 212 of the protective cover 210 and contact the edge bending area 212 of the protective cover 210.

[0174] The portion of the optical adhesive layer 220 corresponding to the middle portion of the display panel 230 is brought into contact with the middle plane area 211 of the protective cover plate 210. Bubbles generated during the bonding process can be discharged from the area where the edge portion is not bonded, thereby reducing the possibility of bubbles being generated between the optical adhesive layer 220 and the middle plane area 211 of the protective cover plate 210.

[0175] When the heating unit 135 heats the optical adhesive layer 220, it also heats the display panel 230, thereby increasing the temperature of the display panel 230. As the temperature of the edge portion of the display panel 230, which is bonded to the edge bending region 212, increases, the edge portion of the display panel 230 becomes softer and less rigid, thereby reducing the elastic restoring force of the edge portion of the display panel 230.

[0176] Therefore, after the carrying film supply unit 120 releases the display panel 230, the supply speed of the edge portion of the display panel 230 is slowed down so that it first contacts the area close to the middle plane area 211 and then contacts the edge bending area 212, so that all bubbles can be discharged through between the optical adhesive layer 220 and the edge bending area 212.

Claims

1. A stacking device for a curved display device, wherein a display panel is bonded to a protective cover plate with an optical adhesive layer, wherein the protective cover plate comprises a flat area and an edge curved area around the flat area. The stacking device comprises: a pad unit, on an upper portion of which the display panel is provided; a lower fixture, supporting the pad unit and enabling the pad unit to move vertically up and down; and An independently controlled heating unit is provided in the pad unit, and selectively or independently controls the temperature of the optical adhesive layer on at least a portion of the protective cover plate during bonding of the protective cover plate and the display panel to remove predicted defects in the edge bending area of the protective cover plate.

2. The stacked device of a curved display device according to claim 1, wherein: The upper clamp further comprises a fixing portion and a moving portion, wherein the fixing portion fixes the protective cover by vacuum adsorption, and the moving portion moves the protective cover fixed by the fixing portion. The lower fixture includes a bottom plate and a vertical driving portion, the bottom plate supports a supporting body of the pad unit, and the vertical driving portion drives the pad unit up and down.

3. The stacked device of a curved display device according to claim 2, wherein: The pad unit includes: a curved elastic pad portion, the display panel being disposed on the curved elastic pad portion, and when the upper clamp or the lower clamp moves in a direction perpendicular to the pad unit, the upper surface of the curved elastic pad portion and the curved shape of the protective cover plate change accordingly; and The support body is configured to be detachable from the curved elastic pad portion; The independently controlled heating unit can be selectively disposed on the curved elastic pad portion.

4. The stacked device of a curved display device according to claim 3, wherein: The carrier film supply unit is arranged in a manner offset from the pad unit, and the carrier film supply unit is used for supplying the carrier film attached to the display panel.

5. The stacked device of a curved display device according to claim 1, wherein: include: The control device independently controls the power supply and temperature of the independently controlled heating units so that the curved elastic pad portion of the pad unit generates heat.

6. The stacked device of a curved display device according to claim 5, wherein: The control device comprises: temperature detection parts, respectively provided on the independently controlled heating units; and The control processing unit independently controls the power on / off and the temperature of the independently controlled heating unit by communicating with the temperature detection unit.

7. The stacked device of a curved display device according to claim 6, wherein: Also includes: The cooling device is linked to the control device and locally and rapidly cools the independently controlled heating unit.

8. The stacked device of a curved display device according to claim 6, wherein: The independently controlled heating unit is at least one of a metal sheet, a metal tube, a metal block, and a metal wire.

9. The stacked device of a curved display device according to claim 8, wherein: The independently controlled heating unit is disposed in a central area of the curved elastic pad portion corresponding to the planar area of the protective cover. The central area of the curved elastic pad portion is surrounded by a protruding support portion protruding upward from a support body of the pad unit.

10. The stacked device of a curved display device according to claim 8, wherein: The independently controlled heating unit is disposed in a corner area of the curved elastic pad portion corresponding to the edge bending area of the protection cover. The corner area is formed outside a protruding support portion protruding upward from the support body of the pad unit.

11. The stacked device of a curved display device according to claim 1, wherein: The optical adhesive layer is composed of an acrylic optical adhesive, and its high-temperature adhesive strength is lower than its room-temperature adhesive strength, and its modulus and cohesive strength decrease as the temperature increases.

12. The stacked device of a curved display device according to claim 8, wherein: The independently controlled heating unit includes a first metal heating wire and a second metal heating wire. The first metal heating wire is independently and discretely arranged on the curved elastic pad portion, and the second metal heating wire is mesh-shaped and cross-arranged in the x-axis direction and the y-axis direction. The intervals between the independently controlled heating units in the x-axis direction and the y-axis direction can be controlled, and the independently controlled heating units can be sewn and bonded to the curved elastic pad portion. The independently controlled heating unit includes a third metal heating wire and a fourth metal heating wire. The third metal heating wire is in a closed curve shape and is independently and discretely configured in the curved elastic pad portion. The fourth metal heating wire is independently configured in the corner areas of the curved elastic pad portion and is independently controlled.

13. A lamination method for a curved display device, in, include: the step of providing a protective cover plate using an upper fixture, the protective cover plate comprising a central planar area and an edge curved area at the periphery of the planar area, providing a pad unit disposed below the upper jig using a lower jig, providing a display panel having an optical adhesive layer on the pad unit, and The step of moving the upper jig or the lower jig in a direction perpendicular to the pad unit and bonding the protective cover under the upper jig and the display panel on the pad unit disposed on the lower jig using the optical adhesive layer; The temperature of the optical adhesive layer is selectively or independently controlled for at least a portion of the protective cover plate to remove a predicted defect generated in the edge bending region of the protective cover plate.

14. The lamination method for a curved display device according to claim 13, wherein: Also includes: removing wrinkles by heating a central area of the display panel corresponding to the planar area of the protective cover; and The step of increasing fluidity by indirectly heating the optical adhesive layer disposed on the central area of the display panel.

15. The lamination method for a curved display device according to claim 13, wherein: include: The step of heating an edge area of the display panel corresponding to the edge bending area of the protection cover to form a curved area.

16. The lamination method for a curved display device according to claim 13, wherein: The invention comprises the steps of heating the edge area of the display panel, heating the optical adhesive layer arranged on the edge area of the display panel to a high temperature above room temperature to reduce the adhesive force compared to room temperature, and removing bubbles through the edge area of the display panel corresponding to the edge bending area of the protective cover.

17. The lamination method for a curved display device according to claim 13, wherein: In the step of removing the predicted defect generated in the edge bending area of the protective cover, while the upper jig or the lower jig is moved in a direction perpendicular to the pad unit to join the protective cover below the upper jig and the display panel arranged on the lower jig, the temperature of the optical adhesive layer on the display panel is selectively or independently controlled for at least a portion of the protective cover to remove the predicted defect in the edge bending area of the protective cover. The temperature of the optical adhesive layer is controlled by an independently controlled heating unit included in the pad unit on which the display panel is arranged, and the independently controlled heating unit is built into the entire area or a partial area of the pad unit. The independently controlled heating unit is a metal sheet, metal tube or metal block selectively configured in the central area or edge area of the pad unit, or a meshed metal heating wire crossing in the x-axis direction and the y-axis direction or a discretely configured metal heating wire in the shape of a closed curve.

18. The lamination method for a curved display device according to claim 17, wherein: The independently controlled heating units are discretely configured in plurality, and are respectively controlled to be turned on and off and their temperatures are changed according to the temperature measurement values measured by the temperature detection parts configured on each of the independently controlled heating units.

19. A curved display device, which is manufactured by bonding a display panel to a protective cover plate with an optical adhesive layer, wherein the protective cover plate comprises a flat area and an edge curved area around the flat area. During the bonding of the protective cover plate and the display panel, the temperature of the optical adhesive layer is selectively or independently controlled for at least a portion of the protective cover plate to eliminate a predicted defect in the edge bending region.

20. The curved display device according to claim 19, wherein: The predicted failure is a bonding failure caused when the optical adhesive layer and the edge bending area of the protective cover plate are in line contact. The bonding failure is wear, bending or stress concentration, demolding, and bubble phenomenon of the optical adhesive constituting the optical adhesive layer.

Images