Patent Publication Number: US-2021184171-A1

Title: Display device and method of manufacturing display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application is Bypass Continuation of International Application No. PCT/JP2019/021397, filed on May 29, 2019, which claims priority from Japanese Application No. JP2018-163040 filed on Aug. 31, 2018. The contents of these applications are hereby incorporated by reference into this application. 
    
    
     BACK GROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a display device and a method of manufacturing the display device. 
     2. Description of the Related Art 
     A display element of a display device, such as an organic EL display device, may deteriorate due to impurities, such as moisture entering inside thereof. To prevent entering of the impurities, for example, a sealing film of a laminate of an inorganic film and an organic film is provided. 
     A method of disposing and curing liquid resin is known as a method of forming an organic film contained in a sealing film. In this case, a dam agent is provided to prevent the liquid resin from overflowing from a predetermined area (see US2015/0228927A, US2014/0132148A, US2015/0380685A). Further, a CVD method is known as a method of forming an inorganic film contained in a sealing film. In this case, the inorganic film may be formed in a predetermined area using a mask (see JP2008-038178A, JP2016-003383A, JP2016-003384A, JP2011-076759A, JP2017-150017A, JP 2012-031473A). 
     SUMMARY OF THE INVENTION 
     In a case where a sealing film is formed by the CVD method with a mask, the sealing film is formed while the mask is away from a substrate. This is to protect the films on the substrate from being damaged due to contact with the mask. At this time, a material for forming the sealing film may flow into a gap between the mask and the substrate, and the sealing film may be formed to the edge of the substrate. If there is a subsequent step of cutting the substrate along the cut line, the sealing film may be cracked and the display device may be less reliable. 
     Specifically, in recent years, a thin display device may be manufactured using a flexible substrate so as to be curved. In the case where the sealing film is formed by the CVD method using a mask, the sealing film is also formed in an area to be curved if the mask and the substrate are not aligned accurately or if a material of the sealing film is adhered between the mask and the substrate. In the case where the sealing film is formed in the area to be curved, the sealing film may be cracked and the display element may be deteriorated. 
     One or more embodiments of the present invention have been conceived in view of the above, and an object thereof is to provide a display device and a method of manufacturing the display device with reduced risk of a crack in a sealing film. 
     According to one aspect of the present invention, there is provided a display device. The display device includes: a display area; a first peripheral area disposed outside the display area; a second peripheral area disposed outside the first peripheral area; an inner dam disposed in the first peripheral area; an outer dam disposed outside the inner dam in the first peripheral area; a resin part formed between the inner dam and the outer dam so as to be higher than the inner dam and the outer dam; and a sealing film disposed so as to overlap with the display area in a plan view. An outer edge of the sealing film overlaps with the resin part or the outer dam in a plan view. 
     In one embodiment of the present invention, the display device further includes a touch sensor including an electrode and a routing wire, the electrode being disposed so as to overlap with the sealing film, the routing wire being electrically connected to the electrode and disposed in the first peripheral area. The resin part has a recess in an area overlapping the routing wire in a plan view. 
     In one embodiment of the present invention, the display device further includes a covering resin disposed on the resin part. 
     According to another aspect of the present invention, there is provided a method of manufacturing method for a display device. The method includes steps of: preparing a substrate including a display area and a first peripheral area disposed outside the display area; disposing a dam agent in the first peripheral area; patterning the dam agent to form an inner dam and an outer dam; forming a resin part between the inner dam and the outer dam to be higher than the inner dam and the outer dam; disposing a mask on the resin part such that an edge of the mask is positioned on the resin part to form a sealing film in the display area; and curving the display device in an area outside the first peripheral area. 
     In one embodiment of the present invention, the method further includes a step of cutting out a piece of a display device from a large plate on which a plurality of display devices are formed. 
     In one embodiment of the present invention, the mask is disposed in contact with the resin part. 
     In one embodiment of the present invention, the method further includes a step of forming a covering resin on the resin part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram illustrating a display device according to an embodiment of the present invention; 
         FIG. 2  is a schematic diagram illustrating a pixel circuit and peripheral circuits; 
         FIG. 3  is a diagram illustrating the relationship between a large plate and individual pieces of a substrate; 
         FIG. 4  is a diagram for illustrating a cross section taken along the line IV-IV of the display device; 
         FIG. 5  is a diagram illustrating a cross section taken along the line V-V of the display device; 
         FIG. 6  is a diagram illustrating a cross section taken along the line VI-VI of the display device; 
         FIG. 7  is a diagram illustrating a cross section taken along the line VII-VII of the display device; 
         FIG. 8A  is a diagram illustrating planar shapes of a first electrode layer and a second electrode layer; 
         FIG. 8B  is a diagram illustrating a cross section taken along the line VIII-VIII of the display device; 
         FIG. 9  is a diagram illustrating a curved display device; 
         FIG. 10A  is a diagram illustrating a modification with a covering resin provided; 
         FIG. 10B  is a diagram illustrating a modification with a covering resin provided; 
         FIG. 10C  is a diagram illustrating a modification with a covering resin provided; 
         FIG. 11A  is a diagram illustrating another modification with a covering resin provided; 
         FIG. 11B  is a diagram illustrating another modification with a covering resin provided; 
         FIG. 11C  is a diagram illustrating another modification with a covering resin provided; 
         FIG. 12  is a flowchart of a method of manufacturing a display device; 
         FIG. 13  is a diagram illustrating a method of manufacturing a display device; and 
         FIG. 14  is a diagram illustrating a method of manufacturing a display device. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of the present invention will be described below referring to the drawings. The disclosure is merely an example, and appropriate modifications while keeping the gist of the invention that can be easily conceived by those skilled in the art are naturally included in the scope of the invention. The accompanying drawings may schematically illustrate widths, thicknesses, shapes, or other characteristics of each part for clarity of illustration, compared to actual configurations. However, such a schematic illustration is merely an example and not intended to limit the present invention. In this specification and each drawing, the same elements as those already described with reference to the already-presented drawings are denoted by the same reference numerals, and detailed description thereof may be appropriately omitted. 
     Further, in the detailed description of the embodiments of the present invention, when a positional relationship between a component and another component is defined, if not otherwise stated, the words “on” and “below” suggest not only a case where the another component is disposed immediately on or below the component, but also a case where the component is disposed on or below the another component with a third component interposed therebetween. 
       FIG. 1  is a plan view of an example of a display device  100  according to an embodiment. An organic EL display device will be taken as an example of the display device  100 . 
     The display device  100  includes a display area  102 , a first peripheral area  104 , and a second peripheral area  106 . Specifically, the display area  102  is composed of pixels including a light-emitting area. In the display area  102 , pixels configured by combining unit pixels (sub-pixels) of a plurality of colors such as red (R), green (G), and blue (B) are arranged in the form of a matrix. A full-color image is displayed by the pixels. 
     The first peripheral area  104  is disposed outside the display area  102 . Specifically, the first peripheral area  104  is disposed on both sides of the display area  102  in a X direction and a Y direction. The X direction is a horizontal direction in  FIG. 1 , and the Y direction is a vertical direction in  FIG. 1 . The second peripheral area  106  is provided outside the first peripheral area  104  in at least one location. In the present embodiment, the second peripheral area  106  is provided below the first peripheral area  104  and is curved as shown in  FIG. 9 . 
     The display device  100  includes an inner dam  108 , an outer dam  110 , a resin part  112 , a touch sensor, a terminal part  122 , a FPC  124 , and a drive IC  126 . The inner dam  108  is disposed in the first peripheral area  104 . Specifically, the inner dam  108  is disposed in the first peripheral area  104  located at least between the display area  102  and the second peripheral area  106 . In the embodiment shown in  FIG. 1 , the inner dam  108  is disposed in the first peripheral area  104  so as to surround the display area  102 . 
     The outer dam  110  is disposed outside the inner dam  108 . Specifically, the outer dam  110  is disposed outside the inner dam  108  in the first peripheral area  104  located at least between the display area  102  and the second peripheral area  106 . In the embodiment shown in  FIG. 1 , the outer dam  110  is disposed to surround the inner dam  108  in the first peripheral area  104 . 
     The resin part  112  is formed between the inner dam  108  and the outer dam  110  so as to be higher than the inner dam  108  and outer dam  110 . Specifically, as shown in  FIG. 1  for example, the resin part  112  is formed in the entire area sandwiched between the inner dam  108  and the outer dam  110 . 
     The touch sensor includes a plurality of electrodes  114 , connecting wires  116 , routing wires, and a part of the drive IC  126 , and detects the touched position. The electrodes  114  are disposed to overlap with a sealing film  418  to be described later. Specifically, the electrodes  114  are overlapped with the sealing film  418  disposed in the display area  102 , and includes a plurality of pairs of drive electrodes and detection electrodes. The plurality of pairs of drive electrodes and detection electrodes are spaced apart in the X and Y directions to generate electrostatic capacitance. For example, the drive electrodes are a plurality of electrodes  114  each having a rhombic shape and arranged in the X direction and the Y direction. The drive electrodes arranged in the X direction are electrically connected to one another by the connecting wires  116  for connecting the rhombic portions of the drive electrodes. In contrast, the drive electrodes arranged in the Y direction are not electrically connected. 
     The detection electrodes are a plurality of electrodes  114  each having a rhombic shape and arranged in the X direction and the Y direction. The detection electrodes arranged in the X direction are not electrically connected. In contrast, the detection electrodes arranged in the Y direction are electrically connected by the connecting wires  116  for connecting the rhombic portions of the detection electrodes. The drive electrode and the detection electrode may have a shape other than a rhombic shape. 
     The connecting wires  116  for connecting the drive electrodes arranged in the X direction and the connecting wires  116  for connecting the detection electrodes arranged in the Y direction are formed in different layers (see  FIG. 8B ). As such, the drive electrodes and the detection electrodes are formed so as not to be electrically connected. The pairs of drive electrodes and detection electrodes are disposed close to each other such that each of the electrodes functions as an electrode of a capacitor to form a capacitance. 
     The electrode  114  is formed in a mesh shape. Specifically, holes provided in the electrode  114  are disposed at a position overlapping the light-emitting area so that the electrode  114  does not block the light emitted from the pixels. The electrode  114  is formed in a mesh shape, and thus can be made of a metal having a small electrical resistance. Further, the sensitivity of the touch sensor can be improved by reducing the electrical resistance of the electrode  114 . 
     The routing wires are electrically connected to the electrodes  114  and disposed in the first peripheral area  104 . Specifically, one routing wire is disposed in each column and each row of the electrically connected drive electrode and the detection electrode. Each routing wire is electrically connects the terminal part  122  with the electrode  114  via the first peripheral area  104  and the second peripheral area  106 . In the first peripheral area  104 , the routing wire is disposed on the inner dam  108 , the resin part  112 , and the outer dam  110 . As shown in  FIG. 1 , the routing wires may include a first routing wire  118  and a second routing wire  120  that are disposed in different layers, and the first routing wire  118  and the second routing wire  120  may be connected in the first peripheral area  104 . 
     The touch sensor detects the touched position based on the voltage of the detection electrode that varies according to a signal entered in the drive electrode. Specifically, a drive signal is entered in the drive electrode. The voltage of the detection electrode varies according to the driving signal via the capacitance. The touch sensor detects the touched position based on the voltage change of the detection electrode. 
     The FPC  124  is connected to the terminal part  122 . The FPC  124  is formed of a resin and has flexibility. 
     The drive IC  126  is disposed in the FPC  124  and supplies power and signals to the touch sensor and the circuits formed in the display area  102 . Specifically, for example, the drive IC  126  applies a potential for conducting between the source and drain electrodes with respect to the scanning signal lines of the pixel transistors disposed corresponding to respective sub-pixels forming one pixel, and supplies a current corresponding to the gradation value of the sub-pixel to each pixel transistor data signal line. The display device  100  displays an image in the display area  102  by the drive IC  126 . The drive IC  126  generates a signal that is fed into the drive electrode, and detects the touched position based on the voltage of the detection electrode. 
       FIG. 2  is a schematic diagram illustrating a pixel circuit and peripheral circuits included in the display device  100 . The display device  100  includes a pixel array unit  4  for displaying an image, and a driving unit for driving the pixel array unit  4 . 
     In the pixel array unit  4 , an organic light-emitting diode  6  and a pixel circuit  8  are arranged in the form of a matrix corresponding to each pixel. The pixel circuit  8  includes a lighting TFT (thin film transistor)  10 , a drive TFT  12 , and a capacitor  14 , for example. 
     The drive unit includes a scanning line driver circuit  20 , a video line driver circuit  22 , a drive power supply circuit  24 , and a control device  26 . The drive unit drives the pixel circuit  8  and controls the light emission by the organic light-emitting diode  6 . 
     The scanning line driver circuit  20  is connected to a scanning signal line  28  provided for each horizontal pixel array (pixel row). The scanning line driver circuit sequentially selects the scanning signal line  28  in response to a timing signal entered from the control device  26 , and applies a voltage to the selected scanning signal line  28  to turn on the lighting TFT  10 . 
     The video line driver circuit  22  is connected to a video signal line  30  provided for each vertical pixel array (pixel column). The video line driver circuit  22  receives a video signal from the control device  26 , and, in accordance with the selection of the scanning signal line by the scanning line driver circuit  20 , outputs a voltage corresponding to the video signal in the selected pixel row to each video signal line  30 . The voltage is applied to the capacitor  14  via the lighting TFT  10  at the selected pixel row. The drive TFT  12  supplies a current corresponding to the applied voltage to the organic light-emitting diode  6 , whereby the organic light-emitting diode  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 organic light-emitting diode  6  via the drive power supply line  32  and the drive TFT  12  in the selected pixel row. 
     Here, a lower electrode of the organic light-emitting diode  6  is connected to the drive TFT  12 . An upper electrode  416  (see  FIG. 4 ) of each organic light-emitting diode  6  is formed of an electrode common to the organic light-emitting diodes  6  of all the pixels. When the lower electrode  410  (see  FIG. 4 ) is formed as an anode, a high electric potential is entered in the lower electrode. In this case, the upper electrode  416  is a cathode and supplied with a low electric potential. When the lower electrode  410  is formed as a cathode, a low electric potential is entered in the lower electrode. In this case, the upper electrode  416  is an anode and supplied with a high electric potential. 
     The display device  100  is an individual piece cut out from a large plate  300  on which a plurality of display devices  100  are disposed. Specifically, as shown in  FIG. 3 , a plurality of display devices  100  are disposed on one large plate  300  before the display devices  100  are separated. As described later, a display device  100  is formed by being cut out from the large plate  300  after the circuit is formed in the display area  102  in the state of the large plate  300 . Accordingly, a part of the outer edge of the first peripheral area  104  is a cut surface of the large plate  300 . 
     Next, a cross section of the display device  100  will be described.  FIG. 4  shows a IV-IV cross section of  FIG. 1 .  FIG. 5  shows a V-V cross section of  FIG. 1 .  FIG. 6  shows a VI-VI cross section of  FIG. 1 .  FIG. 7  shows a VII-VII cross section of  FIG. 1 .  FIG. 8A  is an enlarged view of a potion  800  of  FIG. 1 .  FIG. 8B  shows a VIII-VIII cross section of  FIGS. 1 and 8A .  FIG. 1  shows plurality of the connecting wire  116  and plurality of the electrodes  114 . In this regard,  FIG. 8A  is different from  FIG. 1  in that  FIG. 8A  shows a first electrode layer  502  and a second electrode layer  422 .  FIG. 8B  is a diagram in which a layer below a sealing flattening film  428  is omitted. 
     As shown in  FIGS. 4 to 8B , the display device  100  includes a substrate  402 , a circuit layer  404 , a third metal  406 , a first flattening film  408 , a second flattening film  602 , a resin part  112 , a lower electrode  410 , a rib  412 , an EL layer  414 , an upper electrode  416 , a sealing film  418 , a first electrode layer  502 , an inter-sensor insulating layer  420 , a second electrode layer  422 , and an overcoat  424 . In  FIGS. 4 to 7 , elements such as a spacer  910  shown in  FIG. 9  are omitted. 
     The substrate  402  is formed of glass or a flexible material such as polyimide. The use of the flexible material allows the display device  100  to be curved. 
     The circuit layer  404  includes, for example, an insulating layer, a source electrode, a drain electrode, a gate electrode, a semiconductor layer, and a passivation layer  405  on the substrate  402 . The transistor is formed of the source electrode, the drain electrode, the gate electrode, and the semiconductor layer. The transistor controls the current flowing through the EL layer  414  formed in the pixel, for example. 
     Third metal  406  is disposed on a passivation layer  405  included in the circuit layer  404 . Specifically, the third metal  406  is disposed on the passivation layer  405  in the display area  102 . Further, the third metal  406  is disposed on the source electrode and the second flattening film  602  in an area of the first peripheral area  104  where the passivation layer  405  is not provided. The third metal  406  disposed in the first peripheral area  104  is exposed at the terminal part  122 . 
     The first flattening film  408  is disposed in the display area  102  and the first peripheral area  104 . Specifically, the first flattening film  408  is disposed on the circuit layer  404  and the third metal  406  in the display area  102 . The first flattening film  408  disposed in the display area  102  prevents short-circuiting between the lower electrode  410  and the electrode included in the circuit layer  404 , and flattens a step due to the wiring or the transistor disposed in the circuit layer  404 . 
     The first flattening film  408  is separately disposed at two positions in the first peripheral area  104 . Specifically, as shown in  FIGS. 4 to 6 , the first flattening film  408  is formed into a protruded shape at two positions in a cross-sectional view apart from each other in the first peripheral area  104 . The inner first flattening film  408 , which is one of the first flattening films  408  disposed at the two positions in the first peripheral area  104 , is formed as the inner dam  108  for blocking the sealing flattening film  428 . The outer first flattening film  408  is formed as a part of the outer dam  110 . The first flattening films  408  formed at the two positions in the first peripheral area  104  are formed so as to surround the display area  102  in a plan view. The inner dam  108  and the outer dam  110  are preferably formed to have a height of 20 μm to 50 μm. The distance between the outer edge of the inner dam  108  and the inner edge of the outer dam  110  is preferably 150 μm or less. 
     The second flattening layer  602  is disposed in the first peripheral area  104 . Specifically, as shown in  FIG. 6 , the second flattening layer  602  is disposed on the passivation layer  405  and the substrate  402  in the first peripheral area  104 . The second flattening film  602  flattens the step of the lower layer, thereby preventing disconnection of the third metal  406  disposed above. 
     The resin part  112  is formed higher than the inner dam  108  and the outer dam  110  between the inner dam  108  and the outer dam  110 . Specifically, as shown in  FIGS. 4 to 6 , the resin part  112  is disposed between the inner dam  108  and the outer dam  110  so as to surround the display area  102 . The resin part  112  is formed higher than the inner dam  108  and the outer dam  110 . The outer edge of the resin part  112  on the inner dam  108  side is positioned on the inner dam  108 , and the outer edge of the resin part  112  on the outer dam  110  side is positioned on the outer dam  110 . The outer edge of the resin part  112  on the outer dam  110  side may be located outside the outer dam  110  if the outer edge of the resin part  112  on the outer dam  110  side is located inside the outer edge of the display device  100 . 
     The resin part  112  has a recess  702  in an area overlapping with a routing wire in a plan view. Specifically, as shown in  FIG. 7 , the resin part  112  has the same number of recesses  702  as the routing wires. The resin part  112  in the area that is not overlapping with the routing wire as shown in  FIG. 4  is formed higher than the resin part  112  in the area that is overlapping with the routing wire as shown in  FIG. 5 . The routing wire is disposed on the recess  702 .  FIG. 7  shows a cross section of the side along the Y direction, although the recess  702  is also provided on the side along the X direction of the resin part  112 . 
     The lower electrode  410  is disposed on the first flattening film  408 . Specifically, the lower electrode  410  is formed in the display area  102  so as to be electrically connected to the source electrode or the drain electrode of the transistor formed in the circuit layer  404  through the contact hole formed in the first flattening film  408 . 
     The rib  412  is disposed on the first flattening film  408 . Specifically, the rib  412  is formed in the display area  102  so as to surround an area where the EL layer  414  emits light. As shown in  FIG. 6 , the rib  412  disposed in the first peripheral area  104  is formed as a part of the outer dam  110 . 
     The EL layer  414  is formed on the lower electrode  410 . Specifically, the EL layer  414  is formed on the lower electrode  410  and the edge of the rib  412  in the display area  102 . The EL layer  414  is formed by laminating a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer. The light emitting layer emits light when the hole injected from the lower electrode  410  and the electron injected from the upper electrode  416  are recombined, for example. The hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer are the same as those in the related art, and thus the description thereof is omitted. In the present embodiment, the light emitting layer is formed using a material that emits light of red, green, and blue. 
     The upper electrode  416  is formed on the EL layer  414  and flows a current between the upper electrode  416  and the lower electrode  410  to make the light-emitting layer included in the EL layer  414  to emit light. The upper electrode  416  is formed of, for example, a transparent conductive film including metal such as ITO and IZO or a metal thin film having optical transparency made of AgMg. 
     The sealing film  418  is disposed so as to overlap with the display area  102  in a plan view. Specifically, the sealing film  418  is disposed so as to cover the entire display area  102  and a part of the first peripheral area  104 . The outer edge of the sealing film  418  on the second peripheral area  106  side is located on the resin part  112  or the outer dam  110 . 
     The sealing film  418  includes a lower barrier film  426 , a sealing flattening film  428 , and an upper barrier film  430 . Specifically, the lower barrier film  426  is formed so as to cover the upper electrode  416  in the display area  102 . The sealing flattening film  428  is disposed inside the inner dam  108  so as to cover the lower barrier film  426 . The sealing flattening film  428  flattens the unevenness of the lower barrier film  426 . The upper barrier film  430  is formed so as to cover the lower barrier film  426  and the sealing flattening film  428 . The lower barrier film  426  and the upper barrier film  430  are formed of an inorganic material impermeable to moisture, such as SiN. The sealing flattening film  428  is formed of, for example, acrylic and epoxy. The sealing film  418  prevents moisture from penetrating into the EL layer  414 , and thereby prevents deterioration of the EL layer  414 . The sealing film  418  is not limited to the above-described configuration, and may be formed of one layer or two layers, or may be formed of four or more layers. 
     The outer edges of the lower barrier film  426  and the upper barrier film  430  on the second peripheral area  106  side are located on the resin part  112  or the outer dam  110 . In  FIG. 4 , the outer edges of the lower barrier film  426  and the upper barrier film  430  on the second peripheral area  106  side are located on the resin part  112 . 
     The first electrode layer  502  is disposed on the sealing film  418 . Specifically, the first electrode layer  502  is a connecting wire  116  for electrically connecting a plurality of electrodes  114  arranged in the Y direction. As shown in  FIG. 8B , the first electrode layer  502  is electrically connected to the second electrode layer  422  through the contact hole  802  provided in the inter-sensor insulating layer  420 . The first electrode layer  502  is supplied with a drive signal or outputs a detection signal through the second electrode layer  422 . As shown in  FIG. 8B , the first electrode layer  502  provided in the area where the connecting wire  116  overlaps in a plan view electrically connects the electrodes  114  arranged in the Y direction. The second electrode layer  422  connected to the first electrode layer  502  is a part of the routing wire.  FIG. 4  is a cross-sectional view of an area where the first electrode layer  502  is not disposed. 
     The inter-sensor insulating layer  420  is disposed on the first electrode layer  502 . Specifically, as shown in  FIGS. 4 to 6 , the inter-sensor insulating layer  420  is disposed so as to cover the sealing film  418  in an area where the first electrode layer  502  is not disposed. The inter-sensor insulating layer  420  is disposed so as to cover the first electrode layer  502  except for an area where the contact hole  802  is provided (see  FIGS. 5, 6, 8B ). As shown in  FIG. 8B , in an area where the connecting wire  116  overlaps in a plan view, the drive electrode and the detection electrode (the first electrode layer  502  and the second electrode layer  422 ) are formed so as not to be electrically connected by the inter-sensor insulating layer  420 . 
     The second electrode layer  422  is disposed on the inter-sensor insulating layer  420 . Specifically, as shown in  FIG. 4 , the second electrode layer  422  is disposed on the inter-sensor insulating layer  420  at regular intervals. A gap where the second electrode layer  422  is not disposed is a mesh hole. Further, as shown in  FIGS. 5 and 6 , the second electrode layer  422  is continuously formed in the cross-section of the area that is formed in being extended in the X direction. As shown in  FIG. 8B , the second electrode layer  422  provided in the area where the connecting wire  116  overlaps in a plan view electrically connects the electrodes  114  arranged in the X direction. 
     As shown in  FIGS. 8A and 8B , the connecting wires  116  are arranged in different layers in the area where the connecting wires  116  overlap in a plan view. The connecting wires  116  are composed of the first electrode layer  502  and the second electrode layer  422 . 
     The overcoat  424  is formed on the sealing film  418 . The overcoat  424  protects the underlying layers. 
     Next, the display device  100  being curved will be described.  FIG. 9  is a schematic cross section of the display device  100  in the vicinity of the second peripheral area  106 . As shown in  FIG. 9 , the display device  100  includes a substrate  402 , a protective film  902 , a polarizing plate  904 , a reinforcing film  906 , a heat diffusion sheet  908 , a spacer  910 , a FPC  124 , and a reinforcing resin  912 . 
     The substrate  402  is curved in the second peripheral area  106 . Although not shown in  FIG. 9 , the layers such as the circuit layer  404  and the sealing film  418  are disposed on the substrate  402 . 
     The protective film  902  is disposed on the substrate  402 . The protective film  902  is a film for protecting the layers disposed on the substrate  402 . 
     The polarizing plate  904  reduces the reflection of external light incident on the display device  100 . This increases visibility of the display device  100 . 
     The reinforcing film  906  is a film for reinforcing the display device  100 . The reinforcing films  906  are disposed on flat areas of the front and back surfaces of the curved display device  100 . 
     The heat diffusion sheet  908  is a sheet for diffusing the heat of the display device  100 . Specifically, the heat diffusion sheet  908  diffuses the heat generated by the drive circuit disposed around the display device  100  to the entire display device  100 . This prevents the display device  100  from being locally heated. 
     The spacer  910  is disposed between the front and the back surfaces of the curved display device  100 . The spacer  910  keeps the distance between the front surface and the back surface at a certain level or more. This allows the curvature of the second peripheral area  106  to be kept within an allowable range even if the pressure in the thickness direction is applied to the display device  100 . 
     The edge of the spacer  910  is formed to be a curved surface having the curvature corresponding to the back surface of the second peripheral area  106 . The edge of the spacer  910  is in contact with the back surface of the second peripheral area  106 . This keeps the shape of the second peripheral area  106  even if the pressure is applied to the surface of the second peripheral area  106 . The spacer  910  reduces the stress applied to the wiring disposed in the second peripheral area  106 , thereby making disconnection of the wiring less likely. 
     The FPC  124  is connected to the terminal part  122  of the substrate  402 . The FPC  124  has a drive IC  126  that controls the lighting of the pixels. 
     The reinforcing resin  912  is a resin for reinforcing the display device  100 . The reinforcing resin  912  is disposed in the second peripheral area  106  of the curved display device  100 . The reinforcing resin  912  is applied to the curved area of the display device  100 . 
     The reinforcing resin  912  may not be attached to the second peripheral area  106 . Such configuration enables to increase the flexibility of the second peripheral area  106  and bend the display device  100  with a smaller radius of curvature. When the radius of curvature of the second peripheral area  106  is smaller, the size of the curved display device  100  in a plan view is smaller, and the thickness of the curved display device  100  is also smaller. 
     As described above, according to the present invention, the outer edge of the sealing film  418  on the second peripheral area  106  side is located on the resin part  112  or the outer dam  110 . That is, the sealing film  418  is not disposed on the second peripheral area  106  and the cut surfaces of the large plate  300 . This prevents the sealing film  418  from being cracked due to the bending of the display device  100  or cutting of the large plate  300 . As such, it is possible to prevent moisture from intruding through a crack in the sealing film  418  as an intrusion path and deteriorating the display element. 
     As a modification of the above embodiment, a covering resin  1002  may be provided on the resin part  112 .  FIG. 10A  is an enlarged plan view of the left end of the display device  100  according to a modification.  FIG. 10B  shows a X-X cross-section of  FIG. 10A .  FIG. 10C  shows a X′-X′ cross-section of  FIG. 10A . As shown in  FIGS. 10B and 10C , when a mask  1302  (see  FIG. 13 ) is disposed on the upper surface of the resin part  112 , the upper surface of the resin part  112  may be damaged. In the present modification, the covering resin  1002  is provided on the resin part  112  so as to flatten the unevenness caused by the damages. 
     Specifically, as shown in  FIGS. 10A to 10C , the covering resin  1002  is disposed between the inner dam  108  and the outer dam  110  so as to cover the entire resin part  112 . A recess  702  is provided for each first routing wire  118 . The covering resin  1002  flattens the lower layer of the first routing wire  118 , and thereby preventing disconnection of the first routing wire  118  due to unevenness of the damages. 
       FIG. 11A  is an enlarged plan view of the left end portion of the display device  100  according to another modification.  FIG. 11B  shows a XI-XI cross-section of  FIG. 11A .  FIG. 11C  shows XI′-XI′ cross-section of  FIG. 11A . In the present modification, the covering resin  1002  is disposed between the inner dam  108  and the outer dam  110  so as to cover the entire resin part  112  except for the area where the recess is provided. 
     A recess  702  is provided for each of the plurality of first routing wires  118 . In the example shown in  FIG. 11A , two recesses  702  are provided. The first routing wire  118  is arranged so as to pass through the area where the recess  702  is provided. In the example shown in  FIG. 11A , two first routing wires  118  are disposed in the upper recess  702 , and three first routing wires  118  are disposed in the lower recess  702 . 
     In this modification, the mask  1302  is disposed on the upper surface of the covering resin  1002 . The covering resin  1002  allows the depth of the recess  702  to increase. As such, in a case where the mask  1302  is disposed on the upper surface of the covering resin  1002 , it is possible to prevent the mask  1302  from being in contact with the surface of the resin part  112  and causing unevenness on the surface of the resin part  112 . Accordingly, the lower layer of the first routing wire  118  is flat, and this serves to prevent disconnection of the first routing wire  118  due to the unevenness of damages. 
     The layout of the first routing wire  118  and the recess  702  is not limited to be applied to the modification, and may be applied to the above embodiment. Further, the number of recesses  702  and the number of first routing wires  118  disposed in one recess  702  are not limited to the above examples. 
     Next, a method of manufacturing the display device  100  will be described.  FIG. 12  is a flowchart showing a method of manufacturing the display device  100 . First, layers from the circuit layer  404  to the lower electrode  410  are formed (S 1202 ). This step is the same as that of the related art, and thus a detailed description thereof is omitted. 
     Next, the dam agent is patterned (S 1204 ). Specifically, after the dam agent is disposed in the entire display area  102  and curved area  106 , the dam agent is removed from the area other than the first flattening film  408 , the inner dam  108 , and the area where a part of the outer dam  110  are formed. This results in forming the first flattening film  408 , the inner dam  108 , and a part of the outer dam  110 . The dam agent may be formed into the same shape as described above from the beginning by applying a dam agent, for example. 
     The layers from the third metal  406  to the upper electrodes  416  are then formed (S 1206 ). Here, a part of the rib  412  is formed as another part of the outer dam  110 . 
     Subsequently, the resin part  112  is formed (S 1208 ). Specifically, the resin part  112  is formed by applying a resin material and then curing it by irradiating ultraviolet rays. The resin part  112  may be formed by other methods if the resin part fills the space between the inner dam  108  and the outer dam  110  and is formed higher than the inner dam  108  and the outer dam  110 . 
     Next, the mask  1302  is disposed on the resin part  112 , and the sealing film  418  is formed (S 1210 ). Specifically, as shown in  FIG. 13 , the mask  1302  is disposed in contact with the resin part  112 . The mask  1302  has an opening in an area where the sealing film  418  is formed. The lower barrier film  426  is then formed by the CVD method at a position corresponding to the opening of the mask  1302 . The sealing flattening film  428  is cured by being irradiated with ultraviolet rays after the liquid resin material is disposed in the display area  102 . The liquid resin material is blocked by the inner dam  108 , and thus the sealing flattening film  428  is formed inside of the inner dam  108 . Similarly to the lower barrier film  426 , the upper barrier film  430  is formed by the CVD method at a position corresponding to the opening of the mask  1302 . 
     Next, the mask  1302  is removed, and then the covering resin  1002  is formed (S 1212 ). In S 1210 , when the mask  1302  is in contact with the resin part  112 , the upper surface of the resin part  112  may be damaged. The covering resin  1002  is disposed in the area in contact with the mask  1302 . 
     Next, pieces of the display devices  100  are cut out from the large plate  300  (S 1214 ). A plurality of pieces of the display devices  100  are cut out from one large plate  300 . In this regard, the sealing film  418  is formed using the mask  1302  in S 1208 , and thus there is no sealing film  418  on the cut surface. 
     The cut out display devices  100  are then curved (S 1216 ). Specifically, the polarizing plate  904 , the protective film  902 , and the reinforcing film  906  are attached to the display device  100 , and then the display device  100  is curved while being pressed by the spacer  910 . In this manner, the display device  100  is in a state shown in  FIG. 9 . In this regard, the sealing film  418  is formed using the mask  1302  in S 1208 , and thus there is no sealing film  418  in the curved area (second peripheral area  106 ). 
     According to the present invention, the sealing film  418  is formed by the CVD method using the mask  1302 . The outer edge of the sealing film  418  can be accurately controlled, and thus the sealing film  418  is not disposed on the second peripheral area  106  and the cut surfaces of the large plate  300 . As such, it is possible to prevent moisture from intruding through a crack in the sealing film  418  as an intrusion path and deteriorating the display element. 
     As a modification of the above manufacturing method, the sealing film  418  may be formed such that the mask  1302  is not in contact with the resin part  112  in S 1210 . Specifically, as shown in  FIG. 14 , the sealing film  418  may be formed such that a gap is provided between the upper surface of the resin part  112  and the mask  1302 . In this case, although the sealing film  418  is also formed below the edge of the mask  1302 , the outer edge of the sealing film  418  can be controlled more accurately by using the mask  1302  than in the related art. Further, in a case where a gap is provided between the masks  1302  and the resin parts  112 , the step of providing the covering resin  1002  (S 1212 ) may be omitted. 
     While there have been described what are at present considered to be certain embodiments of the invention, it will be understood that various modifications may be made thereto, and it is intended that the appended claims cover all such modifications as fall within the true spirit and scope of the invention.