JP2016031499A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage in wiring lines or the like due to bending in a flexible display.SOLUTION: A display panel 40 includes an upper structure layer 118 including a display element on one main surface of a film type substrate 70 having flexibility. The display panel 40 includes: a first reinforcing material 122 applied to cover a surface on the upper structure layer 118 side, over the whole curved portion 120 curved in a predetermined curvature or more; and second reinforcing materials 124a, 124b applied on a surface on the substrate 70 side in a non-curve portion excluding the curved portion 120. An overlapping region of the first reinforcing material 122 and the second reinforcing material 124 is only a part of each application region of the first material and of the second reinforcing material, while a boundary portion 132 between the curved portion 120 and the non-curve portion is formed into an overlapping region.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a display device having a display panel that can be bent by forming a display function layer including a display element on one main surface of a flexible film-like substrate.

  A flat panel display such as an organic electroluminescence (EL) display device has a display panel in which a thin film transistor (TFT), an organic light-emitting diode (OLED), or the like is formed on a substrate. Conventionally, a glass substrate has been used as a base material for a display panel, but recently, a flexible display capable of bending the display panel using a resin film such as a polyimide film as the base material has been developed. .

  As a flexible display application, the integrated circuit (IC) or flexible printed circuit (FPC) mounting part, which is provided outside the image display area of the display panel, is folded to the back of the display area to narrow the frame. It is considered to make it easier.

Japanese Patent Laid-Open No. 2005-129846 No. 2009/096067

  When the display panel is bent to the back side as described above, in the bent portion (curved portion), the layer closer to the outer surface (convex surface) with respect to the curved center (line connecting the thickness centers of the curved objects) A tensile stress acts on, and a compressive stress acts on a layer near the inner surface (the concave surface). Since the layer in which TFTs and wirings are formed on the display panel is laminated on a substrate such as a resin film, it becomes a layer away from the center of bending at the curved portion, and the TFTs and wirings are caused by the above-mentioned stress, particularly tensile stress. There was a problem in that breakage was likely to occur. In the organic EL display device, an inorganic material film is formed as a protective film of the OLED by a chemical vapor deposition (CVD) method or the like. The inorganic material film is also easily affected by the above-described tensile stress, and may cause a problem that the OLED deteriorates due to a crack.

  A flexible display panel using a resin film as a base material can be formed to a thickness as thin as several tens of μm, for example, but a reinforcing layer is added to facilitate handling in subsequent assembly processes. Is done. The reinforcing layer is formed by attaching a film or applying a resin. When the reinforcing layer is provided on the back surface of the display panel, the tensile stress on the outer side surface when bent is increased, and the above-described problem is likely to occur. On the other hand, since an IC or FPC is mounted on the display surface side of the display panel, it is difficult to provide a reinforcing layer on the entire surface. Further, when a portion where the reinforcing layer is present and a portion where the reinforcing layer is not provided are provided in the surface of the display panel, stress concentrates on the boundary portion, and the above-described breakage is likely to occur.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a display device having a flexible display panel that is suitably reinforced and prevents breakage of wiring or the like due to bending.

  A display device according to the present invention is a display device having a display panel that can be bent by forming a display functional layer including a display element on one main surface of a flexible film-like substrate. The first reinforcing material attached to the surface of either the display function layer side or the base material side of the display panel, and the other of the display function layer side and the base material side of the display panel A second reinforcing material attached to the surface, wherein the first reinforcing material is applied over the entire curved portion of the display panel, and the second reinforcing material is provided on the display panel. An overlapping region that overlaps the first reinforcing member with a gap therebetween, a boundary portion between the curved portion and the non-curved portion of the display panel is the overlapping region, and the overlapping region is the first region. And only a portion of the deposition area of each of the second reinforcements.

1 is a schematic diagram illustrating a schematic configuration of an organic EL display device according to an embodiment of the present invention. 1 is a schematic plan view of a display panel according to an embodiment of the present invention. FIG. 3 is a schematic vertical sectional view of a display panel at a position along a line III-III shown in FIG. 2. It is a typical vertical sectional view of the display panel corresponding to formation of a curved part. It is a typical vertical sectional view of a display panel in which a curved portion is formed.

  Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

  The display device according to the embodiment of the present invention is an organic EL display device. The organic EL display device is an active matrix display device and is mounted on a television, a personal computer, a mobile terminal, a mobile phone, or the like. FIG. 1 is a schematic diagram illustrating a schematic configuration of an organic EL display device 2 according to the embodiment. The organic EL display device 2 includes a pixel array unit 4 that displays an image and a drive unit that drives the pixel array unit. The organic EL display device 2 is a flexible display, and a flexible resin film is used as a base material instead of a glass substrate, and a laminated structure such as TFT or OLED is formed on the base material.

  In the pixel array unit 4, OLEDs 6 and pixel circuits 8 are arranged in a matrix corresponding to the pixels. The pixel circuit 8 includes a plurality of TFTs 10 and 12 and a capacitor 14.

  On the other hand, the drive unit includes a scanning line drive circuit 20, a video line drive circuit 22, a drive power supply circuit 24 and a control device 26, and drives the pixel circuit 8 to control the light emission of the OLED 6.

  The scanning line driving circuit 20 is connected to a scanning signal line 28 provided for each horizontal arrangement (pixel row) of pixels. The scanning line driving circuit 20 sequentially selects the scanning signal lines 28 according to the timing signal input from the control device 26, and applies a voltage for turning on the lighting TFT 10 to the selected scanning signal lines 28.

  The video line driving circuit 22 is connected to a video signal line 30 provided for each vertical arrangement (pixel column) of pixels. The video line driving circuit 22 receives a video signal from the control device 26, and in accordance with the selection of the scanning signal line 28 by the scanning line driving circuit 20, a voltage corresponding to the video signal of the selected pixel row is applied to each video signal line 30. Output to. The voltage is written into the capacitor 14 via the lighting TFT 10 in the selected pixel row. The driving TFT 12 supplies a current corresponding to the written voltage to the OLED 6, whereby the OLED 6 of the pixel corresponding to the selected scanning signal line 28 emits light.

  The drive power supply circuit 24 is connected to a drive power supply line 32 provided for each pixel column, and supplies a current to the OLED 6 through the drive power supply line 32 and the drive TFT 12 of the selected pixel row.

  Here, the lower electrode of the OLED 6 is connected to the driving TFT 12. On the other hand, the upper electrode of each OLED 6 is configured by an electrode common to the OLED 6 of all pixels. When the lower electrode is configured as an anode (anode), a high potential is input, and the upper electrode is a cathode (cathode) and a low potential is input. When the lower electrode is configured as a cathode (cathode), a low potential is input, and the upper electrode is an anode (anode) and a high potential is input.

  FIG. 2 is a schematic plan view of the display panel 40 of the organic EL display device 2. The pixel array unit 4 shown in FIG. 1 is provided in the display area 42 of the display panel 40, and the OLEDs are arranged in the pixel array unit 4 as described above. As described above, the upper electrode 44 constituting the OLED 6 is formed in common for each pixel and covers the entire display area 42.

  A component mounting area 46 is provided on one side of the rectangular display panel 40, and wirings connected to the display area 42 are arranged. Further, a driver IC 48 constituting a drive unit is mounted in the component mounting area 46, or an FPC 50 is connected. The FPC 50 is connected to the control device 26 and other circuits 20, 22, 24, etc., and an IC is mounted thereon.

  FIG. 3 is a schematic vertical sectional view of the display panel 40 at a position along the line III-III shown in FIG. The display panel 40 has a structure in which a circuit layer made of TFT 72 and the like, an OLED 6, a sealing layer 106 for sealing the OLED 6, and the like are laminated on a base material 70 made of a resin film. For example, a polyimide film can be used as the substrate 70. A protective film 114 can be formed over the sealing layer 106. In the present embodiment, the pixel array unit 4 is a top emission type, and the light generated by the OLED 6 is emitted on the side opposite to the substrate 70, that is, upward in FIG. When the colorization method in the organic EL display device 2 is a color filter method, a color filter is disposed between the sealing layer 106 and the protective film 114 or on the counter substrate side, and white light is generated by the OLED 6. Then, by passing the white light through a color filter, light of colors such as red (R), green (G), and blue (B) is generated.

  In the circuit layer of the display area 42, the pixel circuit 8, the scanning signal line 28, the video signal line 30, the drive power supply line 32, and the like are formed. In addition, at least a part of the driving unit can be formed on the substrate 70 as a circuit layer in a region adjacent to the display region 42. Further, as described above, the driver IC 48 and the FPC 50 constituting the driving unit can be connected to the wiring 116 of the circuit layer in the component mounting region 46.

Specifically, a polysilicon (p-Si) film is formed on the base material 70 via a base layer 80 made of an inorganic insulating material such as silicon nitride (SiN _y ) or silicon oxide (SiO _x ). The -Si film is patterned to selectively leave a p-Si film at a location used in the circuit layer. For example, a semiconductor region 82 to be a channel portion and a source / drain portion of the top gate type TFT 72 is formed using a p-Si film. A gate electrode 86 is disposed on the channel portion of the TFT 72 via a gate insulating film 84. The gate electrode 86 is formed by patterning a metal film formed by sputtering or the like. Thereafter, an interlayer insulating film 88 covering the gate electrode 86 is laminated. Impurities are introduced into the p-Si serving as the source and drain portions of the TFT 72 by ion implantation, and a source electrode 90a and a drain electrode 90b electrically connected thereto are formed. After forming the TFT 72 in this manner, an interlayer insulating film 92 is laminated. A metal film formed by sputtering or the like can be patterned on the surface of the interlayer insulating film 92 to form a wiring 94 or the like, which was used to form the metal film, the gate electrode 86, the source electrode 90a, and the drain electrode 90b. With the metal film, for example, the wiring 116 and the scanning signal line 28, the video signal line 30, and the driving power supply line 32 shown in FIG. 1 can be formed in a multilayer wiring structure. On this, for example, an organic material such as acrylic resin is laminated to form a planarization film 96, and the OLED 6 is formed on the surface of the display region 42 planarized thereby.

  The OLED 6 includes a lower electrode 100, an organic material layer 102, and an upper electrode 104. The lower electrode 100, the organic material layer 102, and the upper electrode 104 are sequentially stacked from the base material 70 side. In this embodiment, the lower electrode 100 is an anode (anode) of the OLED, and the upper electrode 104 is a cathode (cathode). The organic material layer 102 includes a hole transport layer, a light emitting layer, an electron transport layer, and the like.

  If the TFT 72 shown in FIG. 3 is a driving TFT 12 having an n-channel, the lower electrode 100 is connected to the source electrode 90 a of the TFT 72. Specifically, after the above-described planarization film 96 is formed, a contact hole 110 for connecting the lower electrode 100 to the TFT 72 is formed, and the surface of the planarization film 96 and the conductor film formed in the contact hole 110 are patterned. Thus, the lower electrode 100 connected to the TFT 72 is formed for each pixel.

  After the formation of the lower electrode 100, a bank 112 is formed at the pixel boundary. The lower electrode 100 is exposed in the effective area of the pixel surrounded by the bank 112. After the bank 112 is formed, the layers constituting the organic material layer 102 are sequentially stacked on the lower electrode 100. An upper electrode 104 is formed on the organic material layer 102 using a transparent electrode material.

For example, a SiN _y film is formed as a sealing layer 106 on the surface of the upper electrode 104 by a CVD method. In addition, a protective film 114 is laminated on the surface of the display region 42 in order to ensure the mechanical strength of the surface of the display panel 40. On the other hand, the protective film 114 is not provided in the component mounting area 46 for easy connection of IC and FPC. The wiring of the FPC 50 and the terminal of the driver IC 48 are electrically connected to the wiring 116, for example.

  As described above, with reference to FIG. 3, the structure of the display panel 40 in which the display functional layer including the circuit layers such as the OLED 6 and the TFT which are display elements is formed on one main surface of the flexible film-like substrate. Explained. The thickness from the base material 70 to the protective film 114 is relatively thin, and the display panel 40 in this state may lack mechanical strength against bending and pulling. Therefore, the display panel 40 further includes a reinforcing layer made of a reinforcing material on the main surface on the display surface side (display function layer side) or the main surface on the back surface (base material 70 side).

  As shown in FIG. 3, the display panel 40 is manufactured by keeping the entire base material 70 in a flat surface. However, when the display panel 40 is stored in the housing of the organic EL display device 2, the display panel 40 is curved outward from the display area 42 of the display panel 40. The component mounting area 46 can be folded back to the back side of the display area 42 by providing a part. 4 and 5 are schematic vertical sectional views of the display panel 40 corresponding to the formation of the curved portion, and show a cross section at a position along the line III-III shown in FIG. Of the laminated structure of the display panel 40 shown in FIG. 3, the laminated structure such as the display functional layer on the base material 70 is defined as the upper structural layer 118. In FIGS. And a simplified two-layer structure. FIG. 4 is a cross-section in a state where the display panel 40 is kept flat, and FIG. 5 is a cross-sectional view of the FPC 50 in which a curved portion 120 is provided between the display mounting area 46 and the display area 42 in the component mounting area 46. Is a cross-section in a state where the display area 42 is folded back to the back side.

  The reinforcing layer can be formed by attaching a film made of resin or the like with an adhesive or the like, or can be formed by applying and curing a curable resin. For example, a photosensitive acrylic resin, silicon resin, or polyethylene terephthalate (PET) film can be used as the reinforcing material. The reinforcing material is basically applied to the display panel 40 in the state shown in FIG. 4 in which the display panel 40 is kept flat, and after the reinforcing material is applied, it is bent as shown in FIG.

  Based on FIG. 4, the attachment position of the reinforcing material will be described. The reinforcing material includes a first reinforcing material 122 applied to the main surface of the display panel 40 on the upper structural layer 118 side, and a second reinforcing material 124 applied to the main surface of the display panel 40 on the base material 70 side. There is.

  Specifically, the first reinforcing member 122 is attached so as to cover the surface of the upper structural layer 118 so as to cover the entire curved portion 120 of the display panel 40 that is curved with a certain curvature or more. Correspondingly, the first reinforcing member 122 is attached to the entire curved region 126 on the flat display panel 40 shown in FIG.

  On the other hand, the second reinforcing member 124 is attached to the surface on the base material 70 side in the non-curved portion of the display panel 40 excluding the curved portion. In the present embodiment, non-curved portions are provided on both sides of the curved portion 120. That is, the region 128 including the display region 42 and the region 130 to which the FPC 50 or the like is attached are non-curved portions, and the second reinforcing material 124 a is formed in the region 128 and the second reinforcing material 124 b is formed in the region 130. The second reinforcing material 124 can be provided over the entire non-curved portion, and there may be a region where the second reinforcing material 124 is not attached to the non-curved portion.

  The first reinforcing material 122 may protrude outside the planned curved region 126, and the second reinforcing material 124 may be present in a part of the planned curved region 126. Both the reinforcing materials 122 and 124 are shown in FIG. It may have an overlapping region which overlaps with the laminated body of the display panel 40 shown in between.

  In particular, the boundary portion 132 between the curved portion 120 and the non-curved portion is an overlapping region. Therefore, as shown in FIG. 4, the reinforcing material is attached to both surfaces of the display panel 40 at the boundary portion 132 between the planned bending region 126 and the regions 128 and 130 which are non-curved portions.

  On the other hand, the overlapping region is only a part of the deposition region of each of the first reinforcing material and the second reinforcing material. Specifically, the second reinforcing material is not provided in most parts of the planned curved region 126 (curved portion 120) where the first reinforcing material 122 is entirely attached. For example, the second reinforcing material may not be attached to the planned curved region 126 (curved portion 120) inside the boundary portion 132. Further, for example, in the region 130 where the second reinforcing material 124b is provided, the first reinforcing material is not formed on the surface because the FPC 50 and the driver IC 48 are attached.

  The curved region 120 of the display panel 40 of FIG. 4 in which the reinforcing material is applied and the reinforcing layer is formed is curved so that the surface on the upper structure layer 118 side is a convex surface, thereby forming the curved portion 120. For example, the curved portion 120 that bends 180 ° is formed, and the display panel 40 is in a state shown in FIG. For example, in order to make the thickness of the organic EL display device 2 about 5 mm, the thickness (depth) of the display panel 40 at the folded portion is about 3 mm.

  The stress generated in the curved portion 120 changes depending on the position in the thickness direction, and the portion near the convex surface (close to the upper surface of the upper structural layer 118) is stretched by bending, so that tensile stress is generated. Compressive stress is generated in the portion near the back surface of. When tensile stress acts on the circuit layer of the display panel 40, there is a problem that the TFT and the wiring are easily broken. In this regard, the display panel 40 of the present embodiment has the first reinforcing member 122 attached to the convex side, so that the circuit layer in the curved portion 120 is further away from the convex side than when the first reinforcing member 122 is not provided. Since the tensile stress in the circuit layer is reduced, the TFT and wiring are not easily broken. This effect is preferably obtained as the position of the circuit layer is closer to the neutral plane of the bending stress. Therefore, the thickness and material of the first reinforcing member 122 are preferably designed in consideration of this point. Since the compressive stress is less likely to break the circuit layer as much as the tensile stress, the circuit layer may be shifted slightly from the neutral surface to the concave surface. In this regard, considering that the circuit layer has a thickness, the circuit layer can be suitably prevented from being broken by considering the upper surface of the circuit layer to be close to the neutral surface.

  Moreover, the curvature in the curved part 120 is not necessarily uniform. For example, when the curved portion 120 is formed by supporting the vicinity of both ends (boundary portion 132) of the planned curved region 126 to form the curved portion 120, the curvature of the central portion in the bending direction of the curved portion 120 becomes larger than the portion near the boundary portion. obtain. Therefore, the distortion of the circuit layer in the curved portion 120 may be made uniform by increasing the thickness of the first reinforcing member 122 in the portion where the curvature is likely to increase. In the portion where the first reinforcing member 122 is thickened, the distance from the convex surface of the circuit layer is increased and the tensile stress is decreased, or by increasing the thickness, the bending is difficult to bend and the curvature is decreased and the tensile stress is decreased.

  Note that, as described above, the curvature of the bending portion is not uniform as described above, and the curvature may smoothly change between the bending portion and the non-curving portion. In this case, the bending portion and the non-curving portion may occur. The boundary with the club can be difficult to understand. Therefore, for the purpose of clarifying the bending portion and the non-curving portion, a threshold value is used to define the bending portion 120 as a portion that bends with a curvature equal to or greater than the threshold value. Here, for the purpose of the present invention of protecting a part such as a circuit layer from breakage due to tensile stress in the curved portion, basically, the threshold value is appropriately set within a range of a curvature or less where the protection target part can cause breakage or the like. Can be set.

  The first reinforcing member 122 and the second reinforcing members 124a and 124b can be different in thickness and material. For example, the first reinforcing member 122 provided in the curved portion 120 can be made relatively easy to bend, whereas the second reinforcing members 124a and 1124b provided in the non-curved portion can be made relatively difficult to bend.

  Here, when the second reinforcing member 124 is relatively difficult to bend, as a result of applying the second reinforcing member, a portion where the second reinforcing member is attached becomes a non-curved portion, while a portion where the second reinforcing member is not provided. Can be considered to be bent into a curved portion. In this case, the distinction between the curved portion and the non-curved portion is set without directly considering whether or not the curvature exceeds the threshold value.

  As already described, an overlapping portion (boundary portion 132) between the first reinforcing material and the second reinforcing material is provided along the boundary between the curved portion and the non-curved portion. Here, if no overlapping portion is provided, bending stress concentrates on the edge of the reinforcing material, that is, the boundary between the portion where the reinforcing material is applied and the portion where the reinforcing material is not applied. Is likely to occur. In this regard, the display panel 40 of the present embodiment is provided with a boundary portion 132 where the reinforcing material overlaps to prevent the problem. The width w (dimension in the direction orthogonal to the boundary) of the boundary portion 132 can be determined according to the range where the stress concentration caused by the edge of the reinforcing material reaches. For example, the width w can be a dimension several times larger than the thickness of the display panel 40 sandwiched between the reinforcing materials (the total thickness of the base material 70 and the upper structural layer 118).

  In the above-described embodiment, the example in which the present invention is applied in the configuration in which the curved portion 120 having the convex surface on the upper structure layer 118 side is described between the region 128 and the region 130 which are non-curved portions, The present invention can be applied to other configurations. For example, the present invention can be applied to a configuration in which the end portion of the display panel 40 ends with the curved portion 120, that is, a configuration in which the non-curved portion region 130 is not provided, or a configuration in which the curved portion 120 has a convex surface on the substrate 70 side. As an example of a configuration in which the curved portion 120 has the surface of the substrate 70 as a convex surface, a configuration in which the display panel 40 is used in a foldable housing and the folded portion of the housing is incorporated so as to correspond to the curved portion 120 or the like. Can be considered.

  Further, when the display area 42 is bent, particularly when the surface on the upper structure layer 118 side is a convex surface, not only the problem of breakage of the circuit layer, but also a crack occurs in the sealing layer 106 on the OLED 6 to cause moisture and the like. May incur deterioration of the organic material layer 102 due to intrusion. As a countermeasure to this problem, the first reinforcing material is applied to the upper surface of the display region 42, and the sealing layer 106 is placed near the neutral surface, whereby the crack due to tensile stress can be prevented. Note that a first reinforcing material that prevents cracking of the sealing layer 106 due to bending may be directly laminated on the sealing film 106. For example, the protective film 114 can be a film whose thickness and material are determined to function as the first reinforcing material.

  In each of the above embodiments, the case of an organic EL display device has been exemplified as a disclosure example, but other displays such as a liquid crystal display device, other self-luminous display devices, or an electronic paper display device having an electrophoretic element, etc. Also in the apparatus, for example, the present invention can be applied to a case where the component mounting area 46 is folded back. Needless to say, the display device can be applied without limitation from a small to a large size.

  In the scope of the idea of the present invention, those skilled in the art can conceive various changes and modifications, and it is understood that these changes and modifications also belong to the scope of the present invention. For example, those in which the person skilled in the art appropriately added, deleted, or changed the design of the above-described embodiments, or those in which processes have been added, omitted, or changed in conditions also include the gist of the present invention. As long as it is provided, it is included in the scope of the present invention.

  In addition, it is understood that other functions and effects brought about by the aspects described in the present embodiment are apparent from the description of the present specification or can be appropriately conceived by those skilled in the art to be brought about by the present invention.

  2 organic EL display device, 4 pixel array unit, 6 OLED, 8 pixel circuit, 10 lighting TFT, 12 driving TFT, 14 capacitor, 20 scanning line driving circuit, 22 video line driving circuit, 24 driving power supply circuit, 26 control device, 28 scanning signal lines, 30 video signal lines, 32 drive power supply lines, 40 display panels, 42 display areas, 44 upper electrodes, 46 component mounting areas, 48 driver ICs, 50 FPCs, 70 base materials, 72 TFTs, 80 undercoat layers, 82 semiconductor region, 84 gate insulating film, 86 gate electrode, 88, 92 interlayer insulating film, 90a source electrode, 90b drain electrode, 94, 116 wiring, 96 planarization film, 100 lower electrode, 102 organic material layer, 104 upper electrode 106 sealing layer, 110 contact hole, 112 bank, 114 protective film, 11 6 ACF, 118 Superstructure layer, 120 Curved portion, 122 First reinforcing material, 124 Second reinforcing material, 126 Curved region, 132 Boundary portion.

Claims (4)

A display device having a display panel that can be bent by forming a display functional layer including a display element on one main surface of a flexible film-like substrate,
A first reinforcing material deposited on the surface of either the display function layer side or the base material side of the display panel;
A second reinforcing material attached to the other surface of the display panel on the display function layer side and the base material side,
The first reinforcing material is applied over the entire curved portion of the display panel,
The second reinforcing material has an overlapping region that overlaps the first reinforcing material with the display panel interposed therebetween,
The boundary portion between the curved portion and the non-curved portion of the display panel is the overlapping region, and the overlapping region is only a part of the adhesion region of each of the first and second reinforcing members,
A display device. The display device according to claim 1,
The display device, wherein the second reinforcing material is not attached to the curved portion inside the boundary portion. The display device according to claim 1,
The display device, wherein the curved portion is curved so that a surface on the display function layer side is a convex surface. The display device according to claim 1,
The display panel has its end folded back to the back side of the display area by the curved portion provided outside the display area,
The end portion is the non-curved portion, and a flexible printed circuit board is connected to the display function layer;
A display device.

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