Patent Publication Number: US-2023134439-A1

Title: Display device

Description:
TECHNICAL FIELD 
     The present disclosure relates to a display device, and particularly to a display device having a structure in which a first electrode, an organic compound layer, and a second electrode are laminated. 
     BACKGROUND ART 
     As a display device using a light emitting element such as an organic EL element, a display device having a structure in which an organic compound layer including a light emitting layer and a second electrode are laminated on a first electrode provided in an arrangement pattern separated in a manner corresponding to units of sub-pixels constituting one pixel is known. The layers such as the organic compound layer and the second electrode are patterned by a formation method such as a method using a vapor deposition technique, a method using a printing technique, a method using etching, or a method using photolithography. 
     The pattern of the organic compound layer and the second electrode is determined in accordance with a formation pattern of one or a plurality of types of sub-pixels constituting one pixel. For example, in the technique of Patent Document 1, the pattern of the organic compound layer and the second electrode is a stripe-shaped pattern straddling the sub-pixels. 
     CITATION LIST 
     Patent Document 
     
         
         Patent Document 1: WO 2017/212797 A 
       
    
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     The technique of Patent Document 1 has room for improvement in terms of effectively suppressing occurrence of a line defect in an image displayed on a display device even in a case where a defect occurs in a second electrode also functioning as a wiring. 
     The present disclosure has been made in view of the above points, and an object of the present disclosure is to provide a display device capable of suppressing occurrence of a line defect in an image displayed on the display device even in a case where a defect occurs in a second electrode. 
     Solutions to Problems 
     The present disclosure provides, for example, a display device in which sub-pixels each having a structure in which a first electrode and a second electrode are laminated with an organic compound layer having a light emitting layer interposed therebetween are provided in such an arrangement pattern that the sub-pixels are separated from each other, and the second electrode is patterned so as to straddle the sub-pixels and be connected between the sub-pixels, and includes a plurality of branching portions connected to each other, and the branching portions are two-dimensionally arranged. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1 A  is a plan view illustrating a schematic configuration of one embodiment of a display device. 
         FIG.  1 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line IB-IB in  FIG.  1 A . 
         FIG.  2    is a cross-sectional view illustrating a schematic configuration on a cross section taken along line II-II in  FIG.  1 A . 
         FIG.  3    is a diagram illustrating an example of an energized state of a second electrode of the display device. 
         FIG.  4    is a cross-sectional view illustrating a schematic configuration of one embodiment of an auxiliary electrode of the display device. 
         FIG.  5 A  is a plan view illustrating one embodiment of a method of manufacturing a display device.  FIG.  5 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line VB-VB in  FIG.  5 A . 
         FIG.  6 A  is a plan view illustrating one embodiment of a method of manufacturing a display device.  FIG.  6 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line VIB-VIB in  FIG.  6 A . 
         FIG.  7 A  is a plan view illustrating one embodiment of a method of manufacturing a display device.  FIG.  7 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line VIIB-VIIB in  FIG.  7 A . 
         FIG.  8 A  is a plan view illustrating one embodiment of a method of manufacturing a display device.  FIG.  8 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line VIIIB-VIIIB in  FIG.  8 A . 
         FIG.  9 A  is a plan view illustrating a schematic configuration of one modification of a display device.  FIG.  9 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line IXB-IXB in  FIG.  9 A . 
         FIG.  10 A  is a plan view illustrating a schematic configuration of one modification of a display device.  FIG.  10 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line XB-XB in  FIG.  10 A . 
         FIG.  11 A  is a plan view illustrating a schematic configuration of one modification of a display device.  FIG.  11 B  is a cross-sectional view illustrating a schematic configuration on a cross section taken along line XIB-XIB in  FIG.  11 A . 
         FIGS.  12 A and  12 B  are plan views illustrating one embodiment of the second electrode. 
         FIGS.  13 A,  13 B, and  13 C  are plan views illustrating one embodiment of the second electrode. 
         FIG.  14    is a diagram illustrating an example of an energized state of a second electrode of a conventional display device. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, an embodiment and others according to the present disclosure will be described with reference to the drawings. Note that the description will be given in the following order. In the present specification and the drawings, constituent elements having substantially identical functional configurations are given identical reference signs, and repeated description thereof will be omitted. 
     Note that the description will be given in the following order. 
     1. Display device 
     2. Method of manufacturing display device 
     3. Modification of display device 
     The following description is a preferred specific example of the present disclosure, and the content of the present disclosure is not limited to the embodiment and others. 
     [1. Display Device] 
     A display device  101   a  according to one embodiment of the present disclosure includes an organic compound layer  102  ( 102 R,  102 G, and  102 B in  FIGS.  1 B and  2    and other drawings) having a light emitting layer, as illustrated in  FIGS.  1 A,  1 B, and  2    and other drawings. A first electrode  103  ( 103 R,  103 G, and  103 B in  FIGS.  1 B and  2    and other drawings) and a second electrode  104  ( 104 R,  104 G, and  104 B in  FIGS.  1 B and  2    and other drawings) are laminated with the organic compound layer  102  interposed therebetween. Note that, for convenience of description, a laminating direction in which the first electrode  103 , the organic compound layer  102 , and the second electrode  104  are laminated in the display device  101   a  is defined as an up-down direction (Z direction in  FIGS.  1 B and  2   ). A direction from the first electrode  103  toward the second electrode  104  in the display device  101   a  is defined as an upward direction, and a direction opposite to the upward direction is defined as a downward direction. Furthermore, in  FIGS.  1 A and  1 B , for convenience of description, description of a layer or a member formed on a protective layer  114 , which will be described later, is omitted. The same applies to each of  FIGS.  3  to  11  and  14   . Furthermore, relative magnitude ratios of sizes and thicknesses of layers illustrated in  FIGS.  1 A,  1 B, and  2    are described for convenience, and do not define actual magnitude ratios. As for the definition concerning the up-down direction and the magnitude ratios, the same applies to each of  FIGS.  3  to  14   . 
     In the display device  101   a , a pixel region R and a non-pixel region U deviated from the pixel region R are provided, and pixels  105  arranged two-dimensionally are provided in the pixel region R. Each of the pixels  105  includes one or a plurality of types of sub-pixels  106 . Therefore, the sub-pixels  106  are provided in the pixel region R. The sub-pixels  106  are provided in such an arrangement pattern that the sub-pixels  106  are separated from each other. Each of the sub-pixels  106  has a laminated structure in which the first electrode  103 , the organic compound layer  102 , and the second electrode  104  are laminated. The sub-pixels  106  illustrated in the example of  FIG.  1 A  and other drawings are provided in such an arrangement pattern that the sub-pixels  106  are separated from each other two-dimensionally. In the present specification, the “two-dimensionally” indicates expansion in a direction of a predetermined plane. 
     (Types of Sub-Pixels) 
     Examples of a criterion for determining the types of the sub-pixels  106  include differences in color of emitted light, thickness of the organic compound layer  102 , structure of the organic compound layer  102 , combinations thereof, and the like. In a case where a criterion for determining the types of the sub-pixels  106  is a difference in color of emitted light, for example, a case where the sub-pixels  106  include three types: red sub-pixels  106 R, green sub-pixels  106 G, and blue sub-pixels  106 B as the sub-pixels  106  having different emitted light colors as described above can be exemplified. 
     The following describes, as an example, a case where the display device  101   a  includes, as the sub-pixels  106 , three types of sub-pixels: sub-pixels (referred to as red sub-pixels  106 R) from which red light is emitted, sub-pixels (referred to as green sub-pixels  106 G) from which green light is emitted, and sub-pixels (referred to as blue sub-pixels  106 B) from which blue light is emitted, as illustrated in  FIGS.  1 A,  1 B, and  2   . In the example of  FIG.  1 A , a single pixel  105  includes a combination of these three types of sub-pixels  106 R,  106 G, and  106 B. However, this does not limit a combination of colors of the sub-pixels  106  constituting the pixel  105  to the combination of three colors of red, green, and blue in a case where the pixel  105  includes a plurality of types of sub-pixels  106 . Note that, in  FIG.  1 A , portions denoted by letters R, G, and B are portions corresponding to the sub-pixels  106 R, the sub-pixels  106 G, and the sub-pixels  106 B, respectively. The same applies to each of  FIGS.  3  and  5  to  13   . Note that, in the present specification, the sub-pixel  106 R, the sub-pixel  106 G, and the sub-pixel  106 B may be collectively referred to as sub-pixels  106  in a case where types such as color types are not particularly distinguished. 
     (Arrangement Pattern of Sub-Pixels) 
     In the example of  FIG.  1 A , the arrangement pattern of the sub-pixels  106  of each type is a stripe pattern, and the sub-pixels  106  of each type are arranged at positions shifted from each other. Specifically, as for the red sub-pixels  106 R, one section (hereinafter referred to as a unit section) of the sub-pixels  106 R is provided in an elongated rectangular shape, and the unit sections of the sub-pixels  106 R are two-dimensionally arranged in a longitudinal direction (the Y direction in  FIG.  1 A ) of the unit sections and a direction (the X direction in  FIG.  1 A ) orthogonal to the longitudinal direction. The same applies to the green sub-pixels  106 G and the blue sub-pixels  106 B. Furthermore, the red sub-pixels  106 R, the green sub-pixels  106 G, and the blue sub-pixels  106 B are provided at positions shifted from each other in the X direction. 
     (First Electrode) 
     In the display device  101   a , the first electrode  103  is provided on a substrate  107 . 
     The first electrode  103  is provided in a pattern (patterned) so as to have an arrangement corresponding to the arrangement pattern of the sub-pixels  106 , and is provided so as to be two-dimensionally separated in a manner corresponding to the unit sections of the sub-pixels  106 . In the example of  FIGS.  1 A,  1 B, and  2   , three types of first electrodes  103 R for red,  103 G for green, and  103 B for blue are provided corresponding to the three types of sub-pixels  106 R,  106 G, and  106 B, respectively. Note that, in the present specification, the first electrode  103 R, the first electrode  103 G, and the first electrode  103 B may be collectively referred to as the first electrode  103  in a case where types such as color types are not particularly distinguished. 
     On the substrate  107 , a circuit such as a drive transistor for driving the display device  101   a  is provided (not illustrated). The circuit is electrically connected to the first electrode  103 , and a state of energization to the first electrode  103  is controlled. 
     An insulating layer  108  having an opening  109  is provided between adjacent first electrodes  103 . The opening  109  of the insulating layer  108  is provided at positions where the first electrode  103  is provided in plan view of the display device  101   a . The openings  109  are provided in a pattern corresponding to the arrangement pattern of the sub-pixels  106 , and one section of the opening  109  defines the unit section of the sub-pixel  106 . Note that the opening  109  may be provided so as to match the shape of the first electrode  103  or may be provided on the first electrode  103  as illustrated in the example of  FIG.  1 B . In a case where the opening  109  is provided on the first electrode  103 , the insulating layer  108  is provided so as to cover side end surfaces and an outer edge portion on an upper surface side of the first electrode  103  and to ride on the upper surface side of the first electrode  103 . Note that the plan view of the display device  101   a  indicates a case where a line-of-sight direction is the up-down direction. 
     The first electrode  103  functions as an electrode that controls light emission of the sub-pixels  106  in combination with the second electrode  104 , which will be described later. In a case where the first electrode  103  is an anode electrode, the second electrode  104  is a cathode electrode, and in a case where the first electrode  103  is a cathode electrode, the second electrode  104  is an anode electrode. 
     In a case where the first electrode  103  is an anode electrode, the first electrode  103  is preferably formed of a metal having a high work function, such as platinum, gold, silver, chromium, tungsten, nickel, copper, iron, cobalt, or tantalum. Alternatively, the first electrode  103  may be formed of an alloy of the metals having a high work function described above, and may be, for example, formed of an Ag—Pb—Cu alloy or an Al—Nd alloy. 
     However, this does not prohibit the first electrode  103  from being formed of a metal having a small work function. For example, the first electrode  103  may be formed of a conductive material that is a metal having a small work function and has a high light reflectance, such as aluminum or an alloy containing aluminum. In this case, the first electrode  103  can be used as an anode electrode by providing a hole injection layer in the laminated structure forming the sub-pixel  106  to improve a hole injection characteristic. 
     The first electrode  103  may be formed of an indium oxide, an indium-tin oxide (ITO, examples of which include an Sn-doped indium oxide, a crystalline ITO, and an amorphous ITO), an indium-zinc oxide (IZO), an indium-gallium oxide (IGO), an indium-doped gallium-zinc oxide (IGZO), IFO (F-doped In 2 O 3 ), ITiO (Ti-doped In 2 O 3 ), InSnZnO, a tin oxide (SnO 2 ), ATO (Sb-doped SnO 2 ), FTO (F-doped SnO 2 ), a zinc oxide (ZnO), an aluminum oxide-doped zinc oxide (AZO), a gallium-doped zinc oxide (GZO), B-doped ZnO, AlMgZnO (aluminum oxide and magnesium oxide-doped zinc oxide), an antimony oxide, a titanium oxide, NiO, a spinel type oxide, or an oxide having a YbFe 2 O 4  structure. Furthermore, the first electrode  103  may have a structure in which a transparent conductive material having an excellent hole injection characteristic, such as an oxide of indium and tin (ITO) or an oxide of indium and zinc (IZO), is laminated on a multilayer film having a gallium oxide, a titanium oxide, a niobium oxide, a nickel oxide, or the like as a base layer or a reflective film having high light reflectivity, such as aluminum. 
     (Organic Compound Layer) 
     The organic compound layer  102  is provided on the first electrode  103  and the insulating layer  108 . The organic compound layer  102  includes at least a light emitting layer. The organic compound layer  102  is also provided on a part of the insulating layer  108 . 
     The light emitting layer is formed of an organic light emitting material. In the light emitting layer, electrons and holes injected from the first electrode  103  and the second electrode  104  are coupled to generate light. In the display device  101   a , the organic compound layer  102  having a light emitting layer using organic light emitting materials having emitted light colors corresponding to the types of the sub-pixels  106  is provided. In a case where two or more types of the sub-pixels  106  are provided, the organic compound layer  102  is provided for each type of the sub-pixels  106  in a pattern corresponding to the type of the sub-pixels  106 . 
     In the display device  101   a  illustrated in the example of  FIGS.  1 A,  1 B, and  2   , the three types of sub-pixels  106 R,  106 G, and  106 B having different emitted light colors are provided, and the organic compound layer  102  is provided for each emitted light color. An organic compound layer  102 R that emits red light (wavelength: 620 nm to 750 nm) is provided for the sub-pixels  106 R, an organic compound layer  102 G that emits green light (wavelength: 495 nm to 570 nm) is provided for the sub-pixels  106 G, and an organic compound layer  102 B that emits blue light (wavelength: 450 nm to 495 nm) is provided for the sub-pixels  106 B. In a case where the organic compound layer  102 R, the organic compound layer  102 G, and the organic compound layer  102 B are not distinguished from one another, they are also collectively referred to as the organic compound layer  102 . Note that although end surfaces extending in the Y direction of the organic compound layer  102 R, the organic compound layer  102 G, and the organic compound layer  102 B are in contact with each other in  FIG.  1 A  for convenience of description, the end surfaces of the organic compound layer  102 R, the organic compound layer  102 G, and the organic compound layer  102 B are generally separated from each other, as illustrated in  FIG.  2   . The same applies to the second electrode  104  and the protective layer  114 . 
     The organic compound layer  102  is provided on the first electrode  103  in a shape defined so as to close the opening  109  in plan view of the display device  101   a , and is further patterned in substantially the same shape as the second electrode  104 . In a case where the organic compound layer  102  is patterned in substantially the same shape as the second electrode  104 , it is easy to avoid direct contact among the second electrode  104 R, the second electrode  104 G, and the second electrode  104 B at a multi-level crossing portion  112 , which will be described later, and a periphery thereof. In the present specification, a case where a plurality of objects is provided in substantially the same shape includes a case where the objects are provided in the same shape. 
     In a case where the organic compound layer  102  is formed in substantially the same shape as the second electrode  104 , the organic compound layer  102  is patterned in a shape connected between the sub-pixels  106 . Furthermore, the organic compound layer  102  has branches. Branch positions of the organic compound layer  102  are located immediately below branching portions  122  of the second electrode  104 . In the examples of  FIGS.  1 A,  1 B, and  2   , the organic compound layer  102  is connected between the sub-pixels  106  so as to straddle the sub-pixels  106  in a plan view of the display device  101   a , that is, the organic compound layer  102  forms a plurality of column portions extending in the Y direction so as to straddle adjacent unit sections of the sub-pixels  106 . Adjacent column portions of the organic compound layer  102  are connected by bridge portions extending in the X direction. The branches of the organic compound layer  102  are provided at connection portions between the column portions and the bridge portions. The branches are arranged two-dimensionally similarly to the second electrode  104 . 
     Since the organic compound layer  102  is provided in substantially the same shape as the second electrode  104 , steps of patterning the organic compound layer  102  and the second electrode  104  can be merged. This can make it less likely that a processing liquid or the like used during the patterning affects performance of the organic compound layer  102 . 
     In the example of  FIGS.  1 A,  1 B, and  2   , the organic compound layer  102 R, the organic compound layer  102 G, and the organic compound layer  102 B are patterned in substantially the same shapes as the second electrode  104 R, the second electrode  104 G, and the second electrode  104 B, respectively. 
     In a case where the first electrode  103  is an anode electrode and the second electrode  104  is a cathode electrode, the organic compound layer  102  may have a structure in which a hole transport layer, a light emitting layer, and an electron transport layer are laminated in this order from the first electrode  103  toward the second electrode  104  (from bottom to top). In a case where the organic compound layer  102  has such a structure, light emission efficiency can be further increased. Furthermore, the organic compound layer  102  may have a structure in which a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer are laminated in this order from the first electrode  103  toward the second electrode  104 . 
     The hole transport layer is a layer that enhances efficiency of hole transport to the light emitting layer. The hole injection layer is a layer that enhances efficiency of hole injection from the first electrode  103  to the hole transport layer. The electron injection layer is a layer that enhances efficiency of electron injection from the second electrode  104  to the electron transport layer. The electron transport layer is a layer that enhances efficiency of electron transport to the light emitting layer. 
     In a case where a plurality of types of sub-pixels  106  having different emitted light colors is provided, the organic compound layers  102  constituting the sub-pixels  106  may have different thicknesses. Therefore, the thicknesses of the organic compound layers  102  constituting the sub-pixels  106  may be set to appropriate thicknesses according to the emitted light colors. For example, different thicknesses may be determined as the thickness of the organic compound layer  102 R, the thickness of the organic compound layer  102 G, and the thickness of the organic compound layer  102 B. 
     In a case where the organic compound layer  102  is provided in substantially the same shape as the second electrode  104 , it is, for example, preferable that an end surface  102   a  of the organic compound layer  102  and an end surface  104   a  of the second electrode  104  form a continuous surface, as illustrated in the example of  FIG.  1 B . Note that in this case, the organic compound layer  102  and the second electrode  104  more preferably have a tapered shape, as illustrated in the example of  FIG.  1 B . 
     (Second Electrode) 
     In the display device  101   a , the second electrode  104  is provided on the organic compound layer  102 . As described above, the second electrode  104  functions as an electrode that controls a light emission state of the sub-pixels  106  in combination with the first electrode  103 . 
     The second electrode  104  is provided according to each type of the sub-pixels  106 . That is, in a case where two or more types of sub-pixels  106  are provided, the second electrode  104  is provided according to each type of sub-pixels  106 . In the example of  FIGS.  1 A,  1 B , and  2 , three types of second electrodes, that is, a second electrode  104 R for red, a second electrode  104 G for green, and a second electrode  104 B for blue are provided corresponding to the sub-pixel  106 R, the sub-pixel  106 G, and the sub-pixel  106 B, respectively. Note that, in the present specification, the second electrode  104 R, the second electrode  104 G, and the second electrode  104 B may be collectively referred to as the second electrode  104  unless types such as color types are particularly distinguished. 
     The second electrode  104  is patterned so as to straddle the sub-pixels  106  and be connected between the sub-pixels  106 . Furthermore, the second electrode  104  has the plurality of branching portions  122  connected to each other. The branching portions  122  are arranged two-dimensionally and electrically connect portions of the second electrodes  104  corresponding to the unit sections of the sub-pixels  106 . In the example of  FIG.  1 A , the second electrode  104  has column portions  120  continuous in the Y direction so as to straddle adjacent unit sections of the sub-pixels  106 . As illustrated in  FIG.  12 A , adjacent column portions  120  of the second electrode  104  are connected by bridge portions  121  extending in the X direction. The second electrode  104  has the branching portions  122  at connection portions between the column portions  120  and the bridge portions  121 , and portions of the second electrode  104  that form the branching portions  122  are arranged two-dimensionally (in a grid manner in the example of  FIGS.  1 A and  12 A ) in the X direction and the Y direction. Note that  FIG.  12 A  illustrates an example of second electrode  104  of the display device  101   a.    
     Furthermore, the second electrode  104  is preferably patterned in a mesh shape. In a case where the second electrode  104  is provided in a mesh-like pattern, it is easy to realize more uniform image display. 
     In the example of  FIG.  1 A , the second electrode  104  is patterned so as to be connected in the X direction and the Y direction and expand in a grid mesh shape as a whole, as also illustrated in  FIG.  12 A . 
     Moreover, each of the second electrode  104 R, the second electrode  104 G, and the second electrode  104 B is patterned so as to be connected in a grid mesh shape in the X direction and the Y direction and connected as a whole. 
     (Multi-Level Crossing Portion) 
     In a case where two or more types of sub-pixels  106  are provided, a portion of the second electrode  104  that forms the sub-pixel  106  of a predetermined type and a portion of the second electrode  104  that forms the sub-pixel  106  of a type different from the predetermined type are laminated so as to cross in multiple levels. This laminated portion forms the multi-level crossing portion  112 . 
     In the example of  FIGS.  1 A and  1 B , the multi-level crossing portion  112  is provided at a portion where the second electrode  104 R and the second electrode  104 G cross each other in plan view of the display device  101   a . Furthermore, the multi-level crossing portion  112  in which the second electrode  104 R and the second electrode  104 G cross each other is provided. 
     Similarly, the multi-level crossing portion  112  is provided at a portion where the second electrode  104 G and the second electrode  104 B cross each other. 
     As long as the multi-level crossing portion  112  is provided so that direct contact is avoided between portions of the second electrode  104  that cross each other, upper and lower positions of the second electrode  104  that cross each other and a crossing direction are not particularly limited. For example, in a case where the second electrode  104 R and the second electrode  104 G cross each other, any one of the second electrode  104 R and the second electrode  104 G may be on an upper side. Note that, from a viewpoint of suppressing occurrence of a defect of the second electrode  104 , the number of second electrodes  104  crossing each other is preferably 2 or less. 
     The multi-level crossing portion  112  is preferably provided so as to avoid the opening  109  of the insulating layer  108  in plan view of the display device  101   a . In a case where the multi-level crossing portion  112  is provided so as to avoid the opening  109 , a possibility that the light emission state of the sub-pixels  106  is affected by the multi-level crossing portion  112  can be made low with more certainty. In the example of  FIG.  1 A , the second electrode  104 R is patterned so as to straddle a portion between adjacent openings  109  that form the sub-pixels  106 G. Moreover, the second electrode  104 R is patterned so as to straddle a portion between adjacent openings  109  that form the sub-pixels  106 B. Similarly to the second electrode  104 R, the second electrode  104 G straddles a portion between adjacent openings  109  of the sub-pixels  106 R and straddles a portion between adjacent openings  109  of the sub-pixels  106 B. Similarly to the second electrode  104 R, the second electrode  104 B straddles a portion between adjacent openings  109  of the sub-pixels  106 R and straddles a portion between adjacent openings  109  of the sub-pixels  106 G. 
     As illustrated in  FIG.  4   , the second electrode  104  preferably extends from the pixel region R to the non-pixel region U. In this case, in a case where the second electrode  104  is electrically connected to an external circuit, a connection portion between the second electrode  104  and the external circuit can be located in the non-pixel region U. Note that for convenience of description, description of the multi-level crossing portion  112  is omitted in  FIG.  4   . 
     Furthermore, in the display device  101   a , an auxiliary electrode portion  113  is provided in the non-pixel region U. The auxiliary electrode portion  113  is provided in a shape surrounding an entire periphery or a part of the periphery of the pixel region R. The auxiliary electrode portion  113  may have, for example, a ring shape, a U shape, or the like in plan view of the display device  101   a . The auxiliary electrode portion  113  can be made of a similar material to the first electrode  103 . 
     In such a display device  101   a , the second electrode  104  is preferably connected to the auxiliary electrode portion  113  provided in the non-pixel region U, as illustrated in  FIG.  4   . In this case, the second electrode  104  can be electrically connected to the external circuit with the auxiliary electrode portion  113  interposed therebetween, and a path of a current i passing from the first electrode toward the auxiliary electrode  13  through the second electrode can be formed. 
     In a case where the second electrode  104  is a cathode electrode, the second electrode  104  may be formed of a metal oxide. The metal oxide may be, for example, a transparent conductive material such as IZO, ITO, ZnO, SnO, AZO, or GZO. 
     Furthermore, the second electrode  104  may be for example, formed of aluminum (Al), silver (Ag), magnesium (Mg), calcium (Ca), sodium (Na), strontium (Sr), an alkali metal or an alkaline earth metal and silver, an alloy of magnesium and silver, an alloy of magnesium and calcium, an alloy of aluminum and lithium (Li), or the like. 
     (Protective Layer) 
     The protective layer  114  is provided on the second electrode  104 . The protective layer  114  is formed of an insulating material. As the insulating material, for example, a thermosetting resin or the like can be used. Alternatively, the insulating material may be SiN, SiO, SiON, AlO, TiO, or the like and these materials may be laminated. In this case, as the protective layer  114 , a CVD film containing SiN, SiO, SiON, or the like, an ALD film containing AlO, TiO, SiO, or the like, or the like can be exemplified. 
     In the display device  101   a , in a case where two or more types of the sub-pixels  106  are provided, the protective layer  114  is provided for each type of sub-pixels  106 . 
     For example, in the display device  101   a  illustrated in  FIGS.  1 A,  1 B, and  2    and other drawings, a protective layer  114 R, a protective layer  114 G, and a protective layer  114 B are patterned corresponding to the three types of sub-pixels  106 R,  106 G, and  106 B, respectively. In a case where the protective layer  114 R, the protective layer  114 G, and the protective layer  114 B are not distinguished from one another, they are also collectively referred to as the protective layer  114 . 
     The protective layer  114  is preferably patterned in substantially the same shape as the second electrode  104  in plan view of the display device  101   a . In a case where the protective layer  114  is formed in substantially the same shape as the second electrode  104 , the protective layer  114  is patterned so as to straddle the sub-pixels  106  and be connected between the sub-pixels  106 . Furthermore, the protective layer  114  has branches. Branch positions of the protective layer  114  are located immediately above the branching portions  122  of the second electrode  104 . In the example of  FIGS.  1 A,  1 B , and  2  and other drawings, the protective layer  114  is connected between the sub-pixels  106  so as to straddle the sub-pixels  106  in a plan view of the display device  101   a , that is, the protective layer  114  forms a plurality of column portions extending in the Y direction so as to straddle adjacent unit sections of the sub-pixels  106 . Adjacent column portions of the protective layer  114  are connected by bridge portions extending in the X direction. The branches of the protective layer  114  are provided at connection portions between the column portions and the bridge portions. The branches are arranged two-dimensionally similarly to the second electrode  104 . 
     It is more preferable that not only the protective layer  114  is provided in substantially the same shape as the second electrode  104 , but also the protective layer  114  and the organic compound layer  102  are provided in substantially the same shape. In this case, steps of patterning the protective layer  114 , the second electrode  104 , and the organic compound layer  102  can be merged. This can make it less likely that a processing liquid or the like used during the patterning affects performance of the organic compound layer  102 . 
     In the example of  FIGS.  1 A,  1 B, and  2    and other drawings, the protective layer  114 R, the second electrode  104 R, and the organic compound layer  102 R are patterned in substantially the same shape. The protective layer  114 G, the second electrode  104 G, and the organic compound layer  102 G are patterned in substantially the same shape. Furthermore, the protective layer  114 B, the second electrode  104 B, and the organic compound layer  102 B are patterned in substantially the same shape. 
     In a case where the protective layer  114 , the second electrode  104 , and the organic compound layer  102  are provided in substantially the same shape, it is, for example, preferable that an end surface  114   a  of the protective layer  114 , the end surface  102   a  of the organic compound layer  102 , and the end surface  104   a  of the second electrode  104  form a continuous surface, as illustrated in the example of  FIGS.  1 A and  1 B . 
     Furthermore, in a case where the continuous surface is formed, the protective layer  114 , the second electrode  104 , and the organic compound layer  102  preferably have a tapered shape. In a case where the end surface  114   a  of the protective layer  114 , the end surface  104   a  of the second electrode  104 , and the end surface  102   a  of the organic compound layer  102  form a continuous surface, it is possible to reduce a possibility that a defect of the second electrode  104  located on an upper side at the multi-level crossing portion  112  occurs at and in the vicinity of the multi-level crossing portion  112 . Furthermore, in a case where the protective layer  114 , the second electrode  104 , and the organic compound layer  102  have a tapered shape, it is possible to more effectively suppress a defect at and in the vicinity of the multi-level crossing portion  112 . 
     The protective layer  114  covers an uppermost surface of the laminated structure of the organic compound layer  102  and the second electrode  104 . By providing the protective layer  114 , it is possible to restrict mutual contact of an upper surface side of the laminated structure of the organic compound layer  102  and the second electrode  104  at the multi-level crossing portion  112 . In the example of  FIG.  1 B , for example, contact of the laminated structure of the organic compound layer  102 G and the second electrode  104 G and the laminated structure of the organic compound layer  102 B and the second electrode  104 B with the upper surface of the laminated structure of the organic compound layer  102 R and the second electrode  104 R is avoided. 
     (Filling Layer) 
     In the display device  101   a , a filling layer  115  is provided on the protective layer  114 . 
     In the example of  FIG.  2   , the filling layer  115  is provided so as to cover all of the protective layer  114 G, the protective layer  114 B, and the protective layer  114 R. 
     Since the filling layer  115  is provided in the display device  101   a , a surface where the protective layer  114  is formed can be planarized in the display device  101   a . Furthermore, entry of moisture or the like into the organic compound layer  102  from the outside can be effectively avoided. The filling layer  115  may be, for example, a layer formed of a similar resin to the protective layer  114 , a layer formed of an organic resin, or a laminate thereof. As the case where the filling layer  115  is a laminate, a laminate of a layer (referred to as a barrier layer) formed of a similar resin to the protective layer  114  and a layer formed of a resin for adhesion on the barrier layer can be exemplified. Examples of the organic resin include a resin forming a layer for planarization, and specific examples thereof include known materials such as a thermosetting resin and an ultraviolet curable resin. 
     (Color Filter) 
     On the filling layer  115 , a color filter  116  is disposed at positions corresponding to the sub-pixels  106 . In the display device  101   a , in a case where two or more types of sub-pixels  106  are provided, the color filter  116  is provided for each type of sub-pixel  106 . 
     In the example of  FIG.  2   , on the filling layer  115 , a red color filter  116 R is disposed at a position corresponding to the sub-pixels  106 R, a green color filter  116 G is disposed at a position corresponding to the sub-pixels  106 G, and a blue color filter  116 B is disposed at a position corresponding to the sub-pixels  106 B. Note that, in the present specification, the red color filter  116 R, the green color filter  116 G, and the blue color filter  116 B may be collectively referred to as the color filter  116  when they are not distinguished from one another. 
     The red color filter  116 R, the green color filter  116 G, and the blue color filter  116 B adjust colors or wavelengths of light emitted from the organic compound layer  102 R, the organic compound layer  102 G, and the organic compound layer  102 B, respectively. The red color filter  116 R, the green color filter  116 G, and the blue color filter  116 B need not be provided in some cases. 
     (Black Matrix) 
     A black matrix layer  117  is provided between adjacent color filters  116 . The black matrix layer  117  can prevent light emitted from the organic compound layer  102  from entering the color filter  116  of adjacent another sub-pixel  106 , thereby preventing color mixing. 
     The black matrix layer  117  may be, for example, a black resin film mixed with a black colorant and having an optical density of 1 or more. Specifically, a black polyimide resin or the like can be exemplified as a material of the black matrix layer  117 . Note that the black matrix layer  117  need not necessarily be provided. 
     (Counter Glass or the Like) 
     A lens and the like (not illustrated) are disposed on a layer where the color filter  116  and the black matrix layer  117  are provided, a sealing layer  119  and the like is further provided, and counter glass  118  is provided on the sealing layer  119 . The sealing layer  119  can be formed of a resin or the like. Due to the presence of the sealing layer  119 , entry of moisture or the like into the organic compound layer  102  from the outside can be effectively avoided. As the sealing layer  115 , for example, a layer formed of an organic resin or the like may be adopted, and known materials such as a thermosetting resin and an ultraviolet curable resin can be exemplified. The counter glass  118  is only required to be formed of a material that allows light emitted from the organic compound layer  102  to pass therethrough. Examples of the counter glass  118  include various glass substrates such as high strain point glass, soda glass, borosilicate glass, and lead glass, and quartz substrates. Note that the lens may be provided below the layer in which the color filter  116  is provided. 
     (Effects) 
     In a conventional display device having a stripe-shaped second electrode S, for example, in a case where a defect such as disconnection occurs at a position W of the stripe-shaped second electrode S for red sub-pixels as illustrated in  FIG.  14   , there is a possibility that a current does not flow in a portion E of the second electrode S (a portion surrounded by the broken line in  FIG.  14   ) even if a current in a Yic direction flows in other parts of the portion E of the second electrode S. Therefore, there is a possibility that energization in the portion E is cut off. In the display device  101   a , even in a case where a defect such as disconnection occurs at a position W of the second electrode  104  ( 104 R) for the red sub-pixels  106 R, a current flowing in a Yi direction in the column portion  120  different from the column portion  120  corresponding to the position W flows in the Xi direction in the bridge portion  121  via the branching portion  122 , as illustrated in  FIG.  3   . Accordingly, energization in the Yi direction can be performed also in the portion E, and an energized state of the sub-pixel  106  in the portion E (the portion surrounded by the broken line in  FIG.  3   ) can be easily maintained. Therefore, it is possible to suppress occurrence of a line defect in an image displayed on the display device  101   a .  FIG.  3    illustrates an example of a state of the second electrode  104  in a case where the second electrode  104  of the display device  101   a  has a defect.  FIG.  14    illustrates an example of a state of the second electrode S in a case where the second electrode S of the conventional display device has a defect. Furthermore, in  FIG.  3   , arrows Yi and Xi indicate directions in which a current can flow in the second electrode  104  of the display device  101   a . In  FIG.  14   , an arrow Yic indicates a direction in which a current can flow in the second electrode S. 
     Furthermore, according to the second electrode  104  of the display device  101   a , a current can flow not only in the Y direction but also in the X direction, and therefore the number of paths through which a current flows in the second electrode  104  increases. Therefore, influence of a variation in wiring resistance can be suppressed, and for example, a luminance variation of the display device  101   a  can be suppressed. This can be more effectively realized in a case where the second electrode  104  is patterned in a mesh shape. 
     When the display device  101   a  is manufactured, a resist matching the pattern shape of the second electrode  104  is provided as a resist for patterning the organic compound layer  102 , the second electrode  104 , and the protective layer  114 . In a case where the second electrode  104  of the display device  101   a  is provided in a mesh shape, the resist also has a mesh shape. As a result, resist collapse is less likely to occur even when a high-definition pattern is formed, and a possibility of occurrence of a defect during pattern formation can be reduced. 
     [2. Method of Manufacturing Display Device] 
     Hereinafter, a method of manufacturing the display device  101   a  illustrated in  FIGS.  1 A,  1 B, and  2    and other drawings will be described in detail as an example. 
     (Step of Forming First Electrode and Insulating Layer) 
     As illustrated in  FIGS.  5 A and  5 B , the first electrode  103  is formed on the substrate  107  including a drive circuit such as a drive transistor that drives the display device  101   a , and the insulating layer  108  is further laminated. The opening  109  is formed in the insulating layer  108  in accordance with the pattern of the sub-pixels  106 . The first electrode  103  and the insulating layer  108  can be, for example, formed by a sputtering method, chemical vapor deposition (CVD), atomic layer deposition (ALD), or the like. 
     Specifically, for example, a metal layer made of ITO is formed as the first electrode  103  on the substrate  107  in which a circuit layer including the drive circuit is formed on a Si substrate, and the metal layer is patterned by using a photolithography technique and an etching technique. In this process, the first electrode  103  is formed in such an arrangement pattern that the first electrode  103  is separated two-dimensionally in a manner corresponding to the unit sections of the sub-pixels  106 . In the example of  FIGS.  5 A and  5 B , the first electrodes  103  ( 103 R,  103 G, and  103 B) are formed at positions corresponding to the three types of sub-pixels  106  ( 106 R,  106 G, and  106 B). 
     The insulating layer  108  is formed on a surface of the substrate  107  on which the first electrode  103  is formed, and the opening  109  is patterned in accordance with the pattern of the sub-pixels  106 . In this process, the insulating layer  108  is formed so as to fill a region between the opening  109  and the patterned metal layer. Specifically, the insulating layer  108  may be formed of SiON or the like. 
     (Step of Forming Laminated Structure in which Protective Layer  114 R, Second Electrode  104 R, and Organic Compound Layer  102 R are Laminated) 
     As illustrated in  FIGS.  6 A and  6 B , a layer  202 R forming the organic compound layer  102 R corresponding to the sub-pixel  106 R, a layer  204 R forming the second electrode  104 R, and a layer  214 R forming the protective layer  114 R are formed in this order on the first electrode  103  and the insulating layer  108 . Examples of a method for forming these layers include a vacuum vapor deposition method, sputtering, chemical vapor deposition (CVD), and atomic layer deposition (ALD), and further include coating methods such as a spin coating method and a die coating method. 
     A configuration of the layer  202 R forming the organic compound layer  102 R is determined corresponding to a layer configuration of the organic compound layer  102 R in the display device  101   a . For example, in a case where the organic compound layer  102 R has a structure in which an electron transport layer, a light emitting layer, and a hole transport layer are laminated in this order, the layer  202 R forming the organic compound layer  102 R is only required to have a structure in which layers forming an electron transport layer, a light emitting layer, and a hole transport layer are laminated. 
     In a case where the second electrode  104 R is made of IZO, for example, it is only necessary that an IZO film is formed as the layer  204  R forming the second electrode  104 R. Examples of the layer  214 R forming the protective layer  114 R include a CVD film containing SiN, SiO, SiON, or the like. 
     A resist  200  is formed on the layer  214 R forming the protective layer  114 R. The resist  200  is formed in a pattern corresponding to the shape of the second electrode  104 R. The resist  200  is formed on a surface of a laminated body in which the layer  202 R forming the organic compound layer  102 R, the layer  204 R forming the second electrode  104 R, and the layer  214 R forming the protective layer  114 R, and a photolithography method, a dry etching method, or the like is applied while using the resist  200  as a mask. In this way, a laminated structure in which the protective layer  114 R, the second electrode  104 R, and the organic compound layer  102 R are laminated is formed on the first electrode  103 R. The protective layer  114 R and the organic compound layer  102 R are formed in substantially the same shape as the shape of the second electrode  104 R. 
     As illustrated in  FIGS.  7 A and  7 B , after the laminated structure in which the protective layer  114 R, the second electrode  104 R, and the organic compound layer  102 R are laminated is formed, the resist  200  formed on the protective layer  114 R is removed. To remove the resist  200 , a method such as a method using asking, a removal liquid, or the like can be used. 
     (Step of Forming Laminated Structure in which Protective Layer  114 G, Second Electrode  104 G, and Organic Compound Layer  102 G are Laminated) 
     Next, a step of forming a laminated structure in which the protective layer  114 G, the second electrode  104 G, and the organic compound layer  102 G are laminated is performed by a similar method to the step of forming the laminated structure in which the protective layer  114 R, the second electrode  104 R, and the organic compound layer  102 R are laminated. Note that a resist corresponding to the shape of the second electrode  104 G is used instead of the resist  200  corresponding to the shape of the second electrode  104 R. In this way, a laminated structure in which the protective layer  114 G, the second electrode  104 G, and the organic compound layer  102 G are laminated is formed, as illustrated in  FIGS.  8 A and  8 B . In  FIG.  8 A , for convenience of description, description of the protective layer  114 R and the organic compound layer  102 R, and the protective layer  114 G and the organic compound layer  102 G is omitted. 
     (Step of Forming Laminated Structure in which Protective Layer  114 B, Second Electrode  104 B, and Organic Compound Layer  102 B are Laminated) 
     Next, after the laminated structure in which the protective layer  114 G, the second electrode  104 G, and the organic compound layer  102 G are laminated is formed, a step of forming a laminated structure in which the protective layer  114 B, the second electrode  104 B, and the organic compound layer  102 B are laminated is performed by a similar method to the step of forming the laminated structure in which the protective layer  114 R, the second electrode  104 R, and the organic compound layer  102 R are laminated. Note that a resist corresponding to the shape of the second electrode  104 B is used instead of the resist  200  corresponding to the shape of the second electrode  104 R. In this way, the laminated structure in which the protective layer  114 R, the second electrode  104 R, and the organic compound layer  102 R are laminated, the laminated structure in which the protective layer  114 G, the second electrode  104 G, and the organic compound layer  102 G are laminated, and the laminated structure in which the protective layer  114 B, the second electrode  104 B, and the organic compound layer  102 B are laminated are formed as illustrated in  FIGS.  1 A and  1 B . 
     Note that an order of the step of forming the laminated structure in which the protective layer  114 R, the second electrode  104 R, and the organic compound layer  102 R are laminated, the step of forming the laminated structure in which the protective layer  114 G, the second electrode  104 G, and the organic compound layer  102 G are laminated, and the step of forming the laminated structure in which the protective layer  114 B, the second electrode  104 B, and the organic compound layer  102 B are laminated is not limited to the above order. 
     (Step of Forming Filling Layer) 
     The filling layer  115  is formed so as to cover all of the protective layer  114 R, the protective layer  114 G, and the protective layer  114 B. For example, the filling layer  115  can be obtained by forming a layer formed of a similar resin to the protective layer  114  and further forming a layer formed of a resin for adhesion or the like thereon. 
     Then, a laminated component in which the sealing layer  119 , the lens (not illustrated), the color filter  116 , and the black matrix layer  117  are arranged on the counter glass  118  is disposed and fixed on the filling layer  115  so that a side where the color filter  116  is disposed faces the filling layer  115  side. In this way, the display device  101   a  is formed. Note that in this case, the black matrix layer  117  and the sealing layer  119  may be omitted. 
     (Modification of Method of Manufacturing Display Device) 
     Although the laminated component in which the color filter  116 , the black matrix layer  117 , and the like are formed is disposed on the filling layer  115  in the method of manufacturing the display device described above, the method of manufacturing the display device is not limited to this. In the method of manufacturing the display device, layers such as the color filter  116  and the black matrix layer  117  may be sequentially formed on the filling layer  115 . 
     In this case, as for the steps up to the step of forming the filling layer, the steps described in the above method of manufacturing the display device are performed. However, the filling layer  115  formed in the step of forming the filling layer need not have a layer formed of an adhesive resin or the like. For example, as the filling layer  115 , a layer formed of a similar resin to the protective layer  114 , a layer formed of an organic resin, or the like may be adopted. As the organic resin, a resin forming a layer for planarization can be exemplified, as already described. 
     After the step of forming the filling layer, the color filter  116  and the black matrix layer  117  are formed on the filling layer  115 . The lens is disposed on the color filter  116 . Then, a resin forming the sealing layer  119  is applied all over a surface so as to cover the surface on which the lens is disposed. Further, the counter glass  118  is disposed on the resin surface thus applied all over the surface, and the counter glass  118  is fixed by solidification of the sealing layer  119 . In this way, the display device  101   a  is formed. Note that also in this case, the black matrix layer  117  need not necessarily be provided, as described above. 
     Furthermore, as the resin forming the sealing layer  119 , for example, an ultraviolet curable resin, a thermosetting resin, or the like can be used. 
     (Effects) 
     According to the above manufacturing method, the protective layer  114 , the second electrode  104 , and the organic compound layer  102  are formed by a photolithography method, a dry etching method, or the like while using a resist as a mask after a layer forming the organic compound layer  102 , a layer forming the second electrode  104 , and a layer forming the protective layer  114  are laminated. Therefore, the end surface  102   a  of the organic compound layer  102 , the end surface  104   a  of the second electrode  104 , and the end surface  114   a  of the protective layer  114  can be made continuous surfaces. Since the end surface  102   a  of the organic compound layer  102 , the end surface  104   a  of the second electrode  104 , and the end surface  114   a  of the protective layer  114  are continuous surfaces (flush), it is possible to reduce a possibility of occurrence of a defect in the second electrode  104  at and in the vicinity of the multi-level crossing portion  112  during manufacturing of the display device  101   a.    
     In a case where the display device  101   a  is manufactured by the above manufacturing method, the end surface  102   a  of the organic compound layer  102 , the end surface  104   a  of the second electrode  104 , and the end surface  114   a  of the protective layer  114  are continuous surfaces, and the organic compound layer  102 , the second electrode  104 , and the protective layer  114  can be formed in a tapered shape. In the case of manufacturing the display device  101   a , the organic compound layer  102 , the second electrode  104 , and the protective layer  114  are formed in a tapered shape, and the end surfaces  102   a ,  104   a , and  114   a  form a continuous surface, as described above. This produces the following effects. 
     Specifically, it is possible to reduce a possibility that a defect of the second electrode  104  located on an upper side at the multi-level crossing portion  112  occurs at and in the vicinity of the multi-level crossing portion  112  during manufacturing of the display device  101   a.    
     For example, in the multi-level crossing portion  112  in which the second electrode  104 R is located on a lower side and the second electrode  104 G is located on an upper side, the laminated structure in which the organic compound layer  102 G, the second electrode  104 G, and the protective layer  114 G are laminated rides on the laminated structure in which the organic compound layer  102 R, the second electrode  104 R, and the protective layer  114 R are laminated, as illustrated in  FIGS.  8 A and  8 B  and other drawings. In this state, in a case where the organic compound layer  102 R, the second electrode  104 R, and the protective layer  114 R are formed in a tapered shape and the end surfaces  102   a ,  104   a , and  114   a  thereof form a continuous surface, an end surface of the laminated structure in which the organic compound layer  102 R, the second electrode  104 R, and the protective layer  114 R are laminated becomes a smooth inclined surface. This allows the laminated structure in which the organic compound layer  102 G, the second electrode  104 G, and the protective layer  114 G are laminated can smoothly ride on the laminated structure in which the organic compound layer  102 R, the second electrode  104 R, and the protective layer  114 R are laminated, thereby reducing a possibility of occurrence of a defect in the second electrode  104 G. 
     [3. Modification of Display Device] 
     In the above display device  101   a , an example in which the arrangement pattern of the sub-pixels  106  is a stripe shape has been described. The arrangement pattern of the sub-pixels  106  is not limited to this. For example, the arrangement pattern of the sub-pixels  106  may be any of a matrix shape, a delta shape, and a combination of a stripe shape and a matrix shape. 
     (Modification 1) 
     In a display device  101   b  illustrated in the example of  FIGS.  9 A and  9 B , three types of sub-pixels  106 , that is, red sub-pixels  106 R, blue sub-pixels  106 G, and green sub-pixels  106 B are used as the sub-pixels  106 , and the arrangement pattern of the sub-pixels  106  is a delta shape. That is, a shape obtained by connecting combinations of three sections (unit sections of the sub-pixels  106 ) of the sub-pixels  106 R is an acute-angled triangle (delta shape), and combinations of three unit sections forming the acute-angled triangle are two-dimensionally arranged. Note that the unit sections are separated from each other. The same applies to the sub-pixels  106 G and the sub-pixels  106 B, and the three types of the sub-pixels  106 R,  106 G, and  106 B are alternately arranged at positions shifted in a predetermined direction (X direction in  FIG.  9 A ). Furthermore, combinations of the three types of sub-pixels  106 R,  106 G, and  106 B arranged in the X direction are arranged side by side in a K 1  direction diagonally crossing the X direction. Furthermore, the combinations of the three types of sub-pixels  106  are also arranged side by side in a K 2  direction diagonally crossing the X direction. 
     In Modification 1, the second electrode  104  is patterned so as to straddle the sub-pixels  106  and be connected between the sub-pixels  106 . Furthermore, the second electrode  104  has a plurality of branching portions  122  connected to each other, as also illustrated in  FIG.  12 B . Furthermore, the branching portions  122  are arranged two-dimensionally. As illustrated in  FIG.  12 B , the second electrode  104  forms column portions  120   a  and  120   b  continuous in the K 1  direction and the K 2  direction so as to straddle adjacent unit sections of the sub-pixels  106 , and the branching portions  122  are provided at the positions of the sub-pixels  106 . The organic compound layer  102  and the protective layer  114  are also patterned in a similar shape to the second electrode  104 . Note that  FIG.  12 B  illustrates an example of the second electrode  104  in Modification 1. 
     In Modification 1, a shape of the unit sections of the sub-pixels  106  is an elliptical shape in the example of  FIG.  9 A , but the shape of the unit sections of the sub-pixels  106  is not limited to this, and may be a polygon such as a hexagon, a triangle, a rectangle, a perfect circle, or the like. 
     (Modification 2) 
     In a display device  101   c  illustrated in the example of  FIGS.  10 A and  10 B , three types of sub-pixels  106 , that is, red sub-pixels  106 R, blue sub-pixels  106 G, and green sub-pixels  106 B are used as the sub-pixels  106 , and the arrangement pattern of the sub-pixels  106  is a matrix shape. That is, the unit sections of the sub-pixels  106 R are arranged in a matrix. The same applies to the sub-pixel  106 G. In the example of  FIGS.  10 A and  10 B , the sub-pixels  106 B are arranged in a matrix for each of two unit sections arranged obliquely. In a unit section of a pixel  105 , one unit section of the sub-pixel  106 R, one unit section of the sub-pixel  106 G, and two unit sections of the sub-pixel  106 B obliquely arranged are disposed. 
     Although a shape of the unit sections of the sub-pixels  106  is a square in the example of  FIG.  10 A , the shape of the unit sections of the sub-pixels  106  is not limited to this. 
     Also in Modification 2, the second electrode  104  is patterned so as to straddle the sub-pixels  106  and be connected between the sub-pixels  106 . Furthermore, the second electrode  104  has a plurality of branching portions  122  connected to each other, as illustrated in  FIGS.  13 A to  13 C . The branching portions  122  of the second electrode  104  are arranged two-dimensionally. In the example of  FIG.  10 A , the second electrode  104  has column portions  120   a  and  120   b  extending in the Y direction and the X direction as illustrated in  FIGS.  13 A to  13 C , and the branching portions  122  are provided at intersections of the column portion  120   a  and the column portion  120   b .  FIG.  13 A  illustrates an example of the second electrode  104  ( 104 B) for the sub-pixels  106 B,  FIG.  13 B  illustrates an example of the second electrode  104  ( 104 G) for the sub-pixels  106 G, and  FIG.  13 C  illustrates an example of the second electrode  104  ( 104 R) for the sub-pixels  106 R. An extension portion  123  extends two-dimensionally from the branching portions  122  of the second electrode  104  so as to straddle the sub-pixels  106 . In  FIG.  13 A , a state in which two extension portions  123  are provided so as to extend from one branching portion  122  is formed. In  FIGS.  13 B and  13 C , one extension portion  123  is provided so as to extend from one branching portion  122 . The organic compound layer  102  and the protective layer  114  are also patterned in a similar shape to the second electrode  104 . 
     (Modification 3) 
     In a display device  101   d  illustrated in the example of  FIGS.  11 A and  11 B , three types of sub-pixels  106 , that is, sub-pixels  106 R, sub-pixels  106 G, and sub-pixels  106 B are used as the sub-pixels  106 , and an arrangement pattern of the sub-pixels  106  is a combination of a stripe shape and a matrix shape. That is, unit sections of the sub-pixels  106 R and the sub-pixels  106 G are arranged in a matrix. Unit sections of the sub-pixels  106 B are arranged in a stripe shape. 
     Also in Modification 3, the second electrode  104  is patterned so as to straddles the sub-pixels  106  and be connected between the sub-pixels  106 . Furthermore, the second electrode  104  has the plurality of branching portions  122  connected to each other. In the example of  FIG.  11 A , the second electrode  104  ( 104 R,  104 G) can be provided as illustrated in  FIGS.  13 B and  13 C  as in Modification 2. The second electrode  104  ( 104 B) can be provided in a similar manner to  FIG.  12 A . The organic compound layer  102  and the protective layer  114  are also patterned in a similar shape to the second electrode  104 . 
     Similar effects to those of the display device  101   a  can be obtained for any of the display devices  101   b ,  101   c , and  101   d  of Modifications 1 to 3. For example, it is possible to avoid occurrence of cutoff of energization in the sub-pixels  106  due to a defect of the second electrode  104 , and it is possible to suppress occurrence of a line defect of an image displayed on the display devices  101   b ,  101   c , and  101   d.    
     Although examples of the display device, the manufacturing method, and the modifications of the present disclosure have been specifically described above, the present disclosure is not limited to the examples of the display device, the manufacturing method, and the modifications described above, and various modifications based on the technical idea of the present disclosure can be made. 
     For example, the configurations, methods, steps, shapes, materials, numerical values, and the like exemplified in the above examples of the display device, the manufacturing method, and the modifications are merely examples, and configurations, methods, steps, shapes, materials, numerical values, and the like different therefrom may be used as necessary. 
     Furthermore, the configurations, methods, steps, shapes, materials, numerical values, and the like exemplified in the above examples of the display device, the manufacturing method, and the modifications can be combined with each other without departing from the gist of the present disclosure. 
     The materials exemplified in the above display device, manufacturing method, and modifications can be used alone or in combination of two or more unless otherwise specified. 
     Note that the contents of the present disclosure are not to be construed as being limited by the effects exemplified in the present disclosure. 
     The present disclosure can also adopt the following configurations. 
     (1) A display device in which sub-pixels each having a structure in which a first electrode and a second electrode are laminated with an organic compound layer having a light emitting layer interposed therebetween are provided in such an arrangement pattern that the sub-pixels are two-dimensionally separated from each other, and 
     the second electrode is patterned so as to straddle the sub-pixels and be connected between the sub-pixels, and includes a plurality of branching portions connected to each other, and the branching portions are two-dimensionally arranged. 
     (2) The display device according to (1), 
     in which the second electrode is patterned in a mesh shape. 
     (3) The display device according to (1) or (2), 
     in which a pixel region and a non-pixel region are provided, 
     the sub-pixels are provided in the pixel region, and 
     the second electrode extends from the pixel region to the non-pixel region. 
     (4) The display device according to (3), 
     in which an auxiliary electrode portion is provided in the non-pixel region, and 
     the second electrode is connected to the auxiliary electrode portion. 
     (5) The display device according to any one of (1) to (4), 
     in which two or more types of sub-pixels are provided as the sub-pixels, and 
     the organic compound layer according to each type of the sub-pixels is patterned. 
     (6) The display device according to (5), 
     in which the types of the sub-pixels are based on a difference in emitted light color. 
     (7) The display device according to any one of (1) to (6), 
     in which two or more types of sub-pixels are provided as the sub-pixels, and 
     the second electrode according to each type of the sub-pixels is patterned. 
     (8) The display device according to (7), 
     in which a multi-level crossing portion where a part of the second electrode that forms the sub-pixels of a predetermined type and a part of the second electrode that forms the sub-pixels of a type different from the predetermined type cross each other is provided. 
     (9) The display device according to (8), 
     in which an insulating layer having an opening provided n a pattern according to the arrangement pattern of the sub-pixels is provided, and 
     the multi-level crossing portion is located so as to avoid the opening. 
     (10) The display device according to any one of (1) to (9), 
     in which the first electrode is an anode electrode, and 
     the second electrode is a cathode electrode. 
     (11) The display device according to any one of (1) to (10), 
     in which the arrangement pattern of the sub-pixels is selected from a group consisting of a stripe shape, a matrix shape, a delta shape, and a combination of the stripe shape and the matrix shape. 
     (12) The display device according to any one of (1) to (4), (10), and (11), 
     in which an end surface of the second electrode and an end surface of the organic compound layer form a continuous surface. 
     (13) The display device according to any one of (1) to (12), 
     in which two or more types of sub-pixels are provided as the sub-pixels, and 
     an end surface of the second electrode and an end surface of the organic compound layer form a continuous surface for each type of the sub-pixels. 
     REFERENCE SIGNS LIST 
     
         
           101   a ,  101   b ,  101   c ,  101   d  Display device 
           102 ,  102 R,  102 G,  102 B Organic compound layer 
           102   a  End surface of organic compound layer 
           103 ,  103 R,  103 G,  103 B First electrode 
           104 ,  104 R,  104 G,  104 B Second electrode 
           104   a  End surface of second electrode 
           105  Pixel 
           106 ,  106 R,  106 G,  106 B Sub-pixel 
           107  Substrate 
           108  Insulating layer 
           109  Opening 
           112  Multi-level crossing portion 
           113  Auxiliary electrode portion 
           114 ,  114 R,  114 G,  114 B Protective layer 
           115  Filling layer 
           116 ,  116 R,  116 G,  116 B Color filter 
           117  Black matrix 
           118  Counter glass 
           119  Sealing layer 
           120 ,  120   a ,  120   b  Column portion 
           121  Bridge portion 
           122  Branching portion