JPWO2012032663A1 - Organic EL panel - Google Patents

Abstract

Even if a short circuit occurs between the pair of electrodes, the light emitting function of one organic EL element is maintained and the deterioration of the quality of the organic EL panel is suppressed. An organic EL panel 1 in which a plurality of organic EL elements 1A are arranged on a substrate 10, and the organic EL element 1A has a structure in which a first electrode 11, an organic layer 12, and a second electrode 13 are stacked. One organic EL element 1A constitutes one light emitting unit Lu, and the first electrode 11 includes a sub electrode 11S having a plurality of independent electrode patterns for each organic EL element 1A, and the light emitting unit Lu is divided for each sub electrode 11S. The sub-light emitting unit Ls is configured to include a wiring 14 that supplies electricity to each sub-electrode 11S of the first electrode 11, and the sub-electrode 11S is formed by a stacked portion 15 in which a part of the sub-electrode 11S and a part of the wiring 14 are stacked. And the wiring 14 are connected, and a part of the sub-electrode 11S in the vicinity of the stacked portion 15 has a narrow-width portion 11A having a width narrower than the width in one direction of the sub-electrode 11S.

Description

  The present invention relates to an organic EL panel.

  An organic EL panel has one or more organic EL elements arranged on a substrate, and is used as various light emitting devices such as a display and an illumination light source. An organic EL element as one light emitting unit in an organic EL panel has a structure in which an organic layer including a light emitting layer is laminated between a pair of electrodes, one of the pair of electrodes being an anode and the other being a cathode. Light is emitted due to recombination of holes injected from the anode side and electrons injected from the cathode side in the organic layer.

  As a driving method of the organic EL panel, a passive matrix driving method (simple matrix driving method) is known. This is a matrix of organic EL elements in which a cathode is formed with a striped electrode pattern intersecting the anode formed with a striped electrode pattern, and an organic layer is sandwiched between the intersection of the anode and the cathode. A voltage is applied between the selected cathode and anode to cause the organic EL element formed by the cathode and anode to emit light (see Patent Document 1 below).

Japanese Patent Laid-Open No. 2003-264069

  An organic EL element serving as a light-emitting element of an organic EL panel has a structure in which an organic layer is laminated between a pair of electrodes. Therefore, if there is a defect in the film formation of the organic layer, a short circuit is likely to occur between the pair of electrodes. . If there is a short-circuited portion between a pair of electrodes in an organic EL element, when a voltage is applied between the pair of electrodes, a current flows through the short-circuited portion and a function of injecting holes and electrons into the organic layer cannot be obtained. The organic EL element becomes a light emitting defect.

  In an organic EL panel in which a plurality of organic EL elements are arranged on a substrate, when one organic EL element becomes defective in light emission due to the short circuit between the pair of electrodes described above, a display obtained by causing one organic EL element to emit light A function such as illumination cannot be obtained, and the quality of the organic EL panel is deteriorated. For example, when three adjacent organic EL elements emit light in different colors and color display is performed by combining three colors, a desired composite color can be obtained when one of the three organic EL elements becomes defective in light emission. This results in a problem that the quality of the color display deteriorates.

  This invention makes it an example of a subject to cope with such a problem. That is, an object of the present invention is to maintain the light emitting function of one organic EL element even if a short circuit occurs between a pair of electrodes and to suppress deterioration in the quality of the organic EL panel.

In order to achieve such an object, the organic EL panel according to the present invention has at least the following configuration.
An organic EL panel in which a plurality of organic EL elements are arranged on a substrate, wherein the organic EL element has a structure in which a first electrode, an organic layer, and a second electrode are stacked, and one organic EL element is Constituting one light-emitting unit, the first electrode comprises a sub-electrode having a plurality of independent electrode patterns for each organic EL element, and constituting a sub-light-emitting unit that divides the light-emitting unit for each sub-electrode, A wiring for supplying electricity to each sub-electrode of the first electrode is provided, and the sub-electrode and the wiring are connected in a laminated part in which a part of the sub-electrode and a part of the wiring are laminated, and the vicinity of the laminated part A part of the sub-electrode has a narrow portion having a width narrower than a width in one direction of the sub-electrode.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing the structure of an organic EL panel according to an embodiment of the present invention (FIG. 1A is an explanatory view showing a planar structure, and FIG. 1B is an XX sectional view). It is explanatory drawing which showed the function of the narrow part in the organic electroluminescent panel which concerns on one Embodiment of this invention. It is explanatory drawing which showed the other form of the organic electroluminescent panel which concerns on one Embodiment of this invention. It is explanatory drawing which showed the other form of the organic electroluminescent panel which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention includes the contents shown in the drawings, but is not limited thereto. FIG. 1 is an explanatory view showing the structure of an organic EL panel according to an embodiment of the present invention (FIG. 1 (a) is an explanatory view showing a planar structure, and FIG. 1 (b) is an XX sectional view). It is.

  The organic EL panel 1 has a structure in which a plurality of organic EL elements 1A are arranged on a substrate 10. The organic EL element 1A has a structure in which a first electrode 11, an organic layer 12, and a second electrode 13 are stacked (the organic layer 12 includes a light emitting layer 12A). One organic EL element 1A constitutes one light emitting unit Lu. Here, the light emission unit Lu indicates an element that emits light integrally with an input signal or an assembly thereof.

  The first electrode 11 includes a sub-electrode 11S having a plurality of independent electrode patterns for each organic EL element 1A, and constitutes a sub-light-emitting unit Ls that divides the light-emitting unit Lu for each sub-electrode 11S. Each of the sub-electrodes 11 </ b> S constituting the sub-light emitting unit Ls is insulated and partitioned by the insulating film 16.

  The organic EL panel 1 includes a wiring 14 that supplies power to each sub electrode 11 </ b> S of the first electrode 11 separately from the first electrode 11. Each sub-electrode 11S of the first electrode 11 and the wiring 14 are connected by a laminated portion 15 in which a part of the sub-electrode 11S and a part of the wiring 14 are laminated. In the illustrated example, a part of the wiring 14 is laminated on a part of the sub-electrode 11S, but conversely, a part of the sub-electrode 11S may be laminated on a part of the wiring 14. Good.

  As shown in FIG. 2, a part of the sub-electrode 11 </ b> S in the vicinity of the stacked portion 15 has a narrow-width portion 11 </ b> A having a function of separating the sub-electrode 11 </ b> S from the wiring 14 by being divided by heating with excess current. The narrow width portion 11A is a part of the sub-electrode 11S and is formed simultaneously with the main body of the sub-electrode 11S when the sub-electrode 11S is patterned, and is narrower than the width of the sub-electrode 11S in one direction. Have The main body portion of the sub-electrode 11S is a portion that becomes an anode or a cathode of the organic EL element 1A.

  In the organic EL panel 1, the specific resistance of the sub electrode 11 </ b> S is larger than the specific resistance of the wiring 14. That is, in the laminated portion 15, the specific resistance of a part of the laminated sub-electrode 11 </ b> S is larger than the specific resistance of a part of the wiring 14. The sub-electrode 11S is formed of a substantially uniform material including the narrow width portion 11A, and the specific resistance gradually decreases from the narrow width portion 11A to the wiring 14 via the laminated portion 15.

  The wiring 14 has a striped pattern along one direction, a plurality of first electrodes 11 (sub-electrodes 11S) are formed along the wiring 14, and the second electrode 13 is striped in a direction intersecting the wiring 14 Having a pattern. Here, the second electrode 13 is a common electrode for the plurality of sub-electrodes 11S for each organic EL element 1A. In the illustrated example, one second electrode 13 is formed for five sub-electrodes 11S.

  Such an organic EL panel 1 can be driven in a passive matrix using one of the second electrode 13 and the wiring 14 as a scanning line and the other as a data line. At this time, in the selected organic EL element 1A, a forward voltage (a voltage in which the anode side is positive and the cathode side is negative) is applied between the first electrode 11 and the second electrode 13 and injected from the anode side. The holes and electrons injected from the cathode side recombine in the organic layer 12 to emit light. The organic EL panel 1 is used in a display device that selectively emits light from a plurality of organic EL elements 1A, an illumination device that simultaneously emits light from the organic EL elements 1A in a predetermined area, and a light source of other various optical devices. The application is not particularly limited.

  In the organic EL panel 1, one light emitting unit Lu constituted by the organic EL element 1A is divided into sub light emitting units Ls constituted by sub electrodes 11S having a plurality of independent electrode patterns. Accordingly, even if one sub-light emitting unit Ls becomes defective in light emission, the function of one light-emitting unit Lu of one organic EL element 1A is maintained by light emission of another sub-light-emitting unit Ls. For example, assuming that one organic EL element 1A forms one color pixel, even if one sub-emission unit Ls becomes defective in light emission, the light emission of that color is maintained by the other sub-emission unit Ls. As a result, it is possible to suppress the deterioration of the quality of the entire organic EL panel 1 as compared with the case where the entire organic EL element 1A becomes defective in light emission.

  In order to obtain such a function of the sub light emitting unit Ls, it is necessary that the light emission failure of one sub light emitting unit Ls does not adversely affect other sub light emitting units Ls in one light emitting unit Lu. For this reason, each sub-electrode 11S is configured such that the sub-electrode 11S and the wiring 14 are connected by a laminated portion 15 in which a part of the sub-electrode 11S and a part of the wiring 14 are laminated. A part of the sub-electrode 11S in the vicinity of 15 has a structure having a narrow width portion 11A having a function of separating the sub-electrode 11S from the wiring 14 by being divided by heating with an excess current. The narrow portion 11A has a width narrower than the width along the wiring 14 of the sub electrode 11S. Further, the protruding portion 14A has a width that is wider than the width of the narrow width portion 11A along the wiring 14. A laminated portion 15 that connects the sub electrode 11S and the wiring 14 is formed within the width of the protruding portion 14A.

  The function of the narrow portion 11A will be described with reference to FIG. When a short circuit occurs between one sub-electrode 11S of the first electrode 11 and the second electrode 13 in the specific organic EL element 1A, the sub-electrode 11S in the specific organic EL element 1A is disconnected from the wiring 14. Thus, the influence of the short circuit does not reach the other sub-electrode 11S in the light emitting unit Lu.

  Here, as shown in FIG. 9A, when the short-circuited portion P exists between the sub-electrode 11S and the second electrode 13 in the specified organic EL element 1A (light emission unit Lu), the sub-electrode 11S When a voltage is applied between the second electrode 13 and the second electrode 13, a desired potential difference cannot be maintained between the sub-electrode 11S and the second electrode 13 due to excess current passing through the short-circuited point P. The sub light emission unit Ls constituted by the electrode 11S has a light emission failure. In this state, the excess current that flows through the short-circuit portion P flows toward the wiring 14 having a specific resistance lower than that of the sub-electrode 11S, but all the current that flows toward the wiring 14 is part of the sub-electrode 11S. Since the current passes through the narrow portion 11A, current concentrates here, and Joule heat is effectively generated in the narrow portion 11A having a relatively high resistance value. The narrow width portion 11 </ b> A is divided by heating by the Joule heat as shown in FIG. 5B, and the sub electrode 11 </ b> S in the specific sub light emission unit Ls where the short-circuit portion P exists is separated from the wiring 14.

  If the connection between the sub-electrode 11S and the wiring 14 is maintained in a state where the short-circuit portion P exists between one sub-electrode 11S and the second electrode 13, a short circuit is not generated in the passive matrix driving organic EL panel. There is a problem that not only the light emission failure occurs in the generated sub-light emission unit Ls but also the light emission failure that affects the entire panel. If there is a short-circuited part between one electrode on the anode side and one electrode on the cathode side intersecting therewith, all the sub-light emitting units Ls in which the two intersecting electrodes become anodes or cathodes Normal light emission or non-light emission cannot be performed, and linear abnormal light emission (dark line or bright line) is generated along each electrode.

  In addition, in the drive method in which a reverse bias voltage is steadily applied between the shorted anode and cathode, a large current (leakage current) constantly flows at the short-circuited location. The unit Ls causes heat loss, and there is a problem that the range of the light emission failure is expanded by the sub light emission unit Ls around the short-circuited portion during long-term driving.

  In the embodiment of the present invention, the sub-light-emitting unit Ls in which the short circuit has occurred is quickly separated from the wiring 14 so that the other sub-light-emitting units Ls in one light-emitting unit Lu are not adversely affected. It is possible to minimize the functional degradation of the light emitting unit Lu by normal light emission of the sub light emitting unit Ls.

  One feature of the structure of the narrow width portion 11A is that the narrow width portion 11A is formed of a material having the same specific resistance as that of the sub electrode 11S. Assuming that the sub electrode 11S and the wiring 14 are combined with a pattern of a material having a lower resistance than that of the sub electrode 11S, the effective Joule heat cannot be obtained due to the low resistance at this connection portion, and the excess current may not be obtained for a while. There is a risk of causing heat loss of the peripheral sub-light emitting units Ls by continuing to flow. In addition, when the wiring 14 is connected to one side of the sub-electrode 11S without forming the narrow portion 11A, there is no portion where the current is partially concentrated, so that the sub-electrode 11S and the wiring 14 are effectively separated. I can't. That is, by forming the narrow portion 11A as a part of the sub electrode 11S, when the short circuit occurs between one sub electrode 11S and the second electrode 13, the narrow portion 11A is promptly divided, The electrode 11S can be separated from the wiring 14.

  Another feature is that a part of the sub-electrode 11S and a part of the wiring 14 are directly laminated. Here, the sub-electrode 11S having a relatively high resistance and the wiring 14 having a relatively low resistance are directly laminated, and there are no inclusions having intermediate resistance therebetween. As a result, the current density is locally increased in the narrow portion 11A in the vicinity of the laminated portion 15, and positive heating occurs here, and the narrow portion 11A is divided. As a result, the sub-electrode 11S in which a short circuit has occurred can be separated from the wiring 14 more effectively.

  In the illustrated example, a part of the wiring 14 described above has a protruding portion 14 </ b> A that protrudes from the side edge of the wiring 14 toward the sub-electrode 11 </ b> S. According to this, regardless of the width of the wiring 14, the length of the laminated portion 15 described above can be arbitrarily set. Thereby, the electric supply to the sub electrode 11 </ b> S can be appropriately adjusted according to the length of the stacked portion 15.

  In the illustrated embodiment, the width W1 of a part of the wiring 14 described above is formed larger than the width W2 of a part of the sub electrode 11S. That is, the width W1 of the protruding portion 14A in the wiring 14 is formed larger than the width W2 of the narrow width portion 11A of the sub-electrode 11S. According to this, by narrowing the width of the narrow portion 11A where excessive current is concentrated, the sub-electrode 11S and the wiring 14 can be quickly separated, and the pattern of the sub-electrode 11S and the pattern of the wiring 14 are also achieved. Are connected to each other, the difference between the width W1 of the protrusion 14A and the width W2 of the narrow portion 11A allows a displacement, and the width of the stacked portion 15 is kept constant without performing highly accurate positioning. The electric supply to the sub-electrode 11S can be stabilized in all the organic EL elements 1A.

  FIG. 3 is an explanatory view showing another form of the organic EL panel 1. In this embodiment, the area of the laminated portion 15 is different for each sub-electrode 11S formed along the wiring 14, and in the illustrated example, the area of the laminated portion 15 is from the power feeding portion 20 that supplies current to the wiring 14. The area of the sub-electrode 11S (11S-1) having a long distance to the narrow portion 11A is larger than the area of the sub-electrode 11S (11S-2) having a short distance from the power feeding unit 20 to the narrow portion 11A.

  Here, the length (L1, L2) of the protruding portion 14A is changed in order to make the area of the laminated portion 15 different, and the width of the narrow portion 11A is any of the sub-electrodes 11S (11S-1, 11S-2). ). Thus, even if the area of the stacked portion 15 is changed, the cutting performance of the narrow portion 11A is not affected. In this way, the area of the laminated portion 15 is the same as that of the sub-electrode 11S (11S-1) where the distance from the power supply portion 20 to the narrow width portion 11A is long, and the sub-electrode where the distance from the power supply portion 20 to the narrow width portion 11A is short By making the area larger than the area in 11S (11S-2), the voltage drop due to the resistance of the wiring 14 can be offset by the difference in the area of the laminated part 15, and the light emission of the sub-emission unit Ls on the side closer to and far from the power feeding part 20 The problem of uneven brightness can be solved, and uniform brightness can be obtained throughout the organic EL panel 1.

  FIG. 4 is an explanatory view showing another embodiment of the organic EL panel 1 (FIG. 4 (a) shows the overall configuration of the panel, and FIG. 4 (b) is an enlarged view of part A in FIG. 4 (a)). Shows the figure). In the organic EL panel 1, a plurality of light emitting units 100 including a plurality of organic EL elements 1A are arranged, and a plurality of adjacent organic EL elements 1A in the light emitting unit 100 emit light in different colors (C1, C2, C3). To do. Also in this example, one organic EL element 1A constitutes one light emitting unit Lu, and one light emitting unit Lu is constituted by a plurality of sub light emitting units Ls formed by the sub electrode 11S. The organic EL panel 1 can perform color display by combining a plurality of colors, for example. In this case, the light emitting unit 100 described above becomes one pixel.

  In the illustrated example, the first organic EL element 1A-1 emits light with the first color C1, the second organic EL element 1A-2 emits light with the second color C2, and the third organic EL element 1A. -3 emits light with the third color C3. In the example shown here, in the first organic EL element 1A-1 that emits light in the first color C1 and the second organic EL element 1A-2 that emits light in the second color C2, the sub electrode 11S (sub light emission) The number of units Ls) is different. Also, in the second organic EL element 1A-2 that emits light with the second color C2 and the third organic EL element 1A-3 that emits light with the third color C3, the number of sub-electrodes 11S (sub-light emitting units Ls) Is different.

  Increasing the number of sub-electrodes 11S (sub-light-emitting units Ls) can reduce the influence when one sub-light-emitting unit Ls has a light emission failure. However, increasing the number of sub-light-emitting units Ls increases each sub-electrode 11S. As a result, the aperture ratio is sacrificed. On the other hand, the emission color of the organic EL element 1A may have different luminance for each color even when driven at the same voltage. It is necessary to maintain the brightness balance. In the illustrated example, in consideration of such a situation, the number of sub-electrodes 11S (sub-light emission units Ls) is changed for each color to adjust the luminance balance for each color.

  Hereinafter, a configuration example of the organic EL panel according to the embodiment of the present invention will be described more specifically with reference to FIG.

The substrate 10 is formed of a base material that can support the organic EL element 1 </ b> A, such as glass, plastic, or a metal having an insulating material layer formed on the surface thereof. The transparent conductive film layer forming the first electrode 11 (sub electrode 11S) is made of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), zinc oxide-based transparent conductive film, SnO ₂ -based transparent conductive film, titanium dioxide-based transparent A transparent metal oxide such as a conductive film is used, and the wiring 14 can be made of silver (Ag), a silver alloy, aluminum (Al), an aluminum alloy, or the like, which is a low electrical resistance metal. The pattern formation of the first electrode 11 (sub electrode 11S) or the wiring 14 on the substrate 10 can be performed by a photolithography process or the like after film formation by sputtering or vapor deposition.

  The insulating film 16 is provided to ensure insulation of the patterned first electrode 11 (sub-electrode 11S) and the wiring 14, and a material such as polyimide resin, acrylic resin, silicon oxide, silicon nitride is used. The insulating film 16 is formed on the substrate 10 on which the first electrode 11 (sub electrode 11S) and the wiring 14 are formed, and then patterned to form an opening of the sub light emitting unit Ls on the sub electrode 11S. . Specifically, a film is formed on the substrate 10 on which the sub-electrode 11S and the wiring 14 are formed to have a predetermined coating thickness by spin coating, and exposure processing and development processing are performed using an exposure mask. A layer of the insulating film 16 having the opening pattern shape of the sub light emission unit Ls is formed. The insulating film 16 is formed in a lattice shape so as to cover the wiring 14, fill the space between the patterns of the sub-electrode 11S, and partially cover the side end portion thereof. As a result, the sub-emission unit Ls is opened on the sub-electrode 11S, and the region is insulated and partitioned by the insulating film 16.

  In order to form the pattern of the second electrode 13 without using a mask or the like, or to completely insulate the adjacent second electrode 13 completely, the partition wall (not shown) is striped in the direction intersecting the wiring 14. Formed. Specifically, an insulating material such as a photosensitive resin is formed on the insulating film 16 so that the film thickness is larger than the total thickness of the organic layer 12 and the second electrode 13 forming the organic EL element 1A. After coating and forming, the ultraviolet light or the like is irradiated on the photosensitive resin film through a photomask having a stripe pattern intersecting the first electrode 11, and development resulting from the difference in the exposure amount in the layer thickness direction By utilizing the difference in speed, a partition wall having a downward tapered surface is formed.

  The organic layer 12 has a laminated structure of a light emitting functional layer including a light emitting layer 12A. When one of the first electrode 11 and the second electrode 13 is an anode and the other is a cathode, the hole injection layer, A hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and the like are selectively formed. As the film formation of the organic layer 12, a vacuum deposition method or the like is used as a dry film formation, and coating or various printing methods are used as a wet film formation.

  An example of forming the organic layer 12 will be described below. For example, first, NPB (N, N-di (naphtalence) -N, N-dipheneyl-benzidene) is formed as a hole transport layer. This hole transport layer has a function of transporting holes injected from the anode to the light emitting layer. The hole transport layer may be a single layer or a stack of two or more layers. In addition, the hole transport layer is not formed by a single material, but a single layer may be formed by a plurality of materials, and a guest material having a high charge donating (accepting) property may be formed on a host material having a high charge transport capability. Doping may be performed.

Next, a light emitting layer is formed on the hole transport layer. As an example, red (R), green (G), and blue (B) light-emitting layers are formed in respective film formation regions by using a resistance heating vapor deposition method using a coating mask. As the red (R), an organic material that emits red light such as a styryl pigment such as DCM1 (4- (dicyanomethylene) -2-methyl-6- (4′-dimethylaminostyryl) -4H-pyran) is used. An organic material that emits green light such as an aluminum quinolinol complex (Alq ₃ ) is used as green (G). As the blue (B), an organic material emitting blue light such as a distyryl derivative or a triazole derivative is used. Of course, other materials or a host-guest layer structure may be used, and the light emission form may be a fluorescent light emitting material or a phosphorescent light emitting material.

The electron transport layer formed on the light emitting layer is formed by using various materials such as an aluminum quinolinol complex (Alq ₃ ) by various film forming methods such as resistance heating vapor deposition. The electron transport layer has a function of transporting electrons injected from the cathode to the light emitting layer. This electron transport layer may have a multilayer structure in which only one layer is stacked or two or more layers are stacked. In addition, the electron transport layer may be formed of a plurality of materials instead of a single material, and a guest material having a high charge donating (accepting) property may be formed on a host material having a high charge transport capability. It may be formed by doping.

When the second electrode 13 formed on the organic layer 12 is a cathode, a material (metal, metal oxide, metal fluoride, alloy, or the like) having a work function smaller than that of the anode (for example, 4 eV or less) is used. Specifically, metal films such as aluminum (Al), indium (In), magnesium (Mg), amorphous semiconductors such as doped polyaniline and doped polyphenylene vinylene, Cr ₂ O ₃ , An oxide such as NiO or Mn ₂ O ₅ can be used. As the structure, a single layer structure made of a metal material, a laminated structure such as LiO ₂ / Al, or the like can be adopted.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. The embodiments described in the above drawings can be combined with each other as long as there is no particular contradiction or problem in the purpose, configuration, or the like. Moreover, the description content of each figure can become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.

1: organic EL panel, 1A: organic EL element,
10: substrate, 11: first electrode, 11S: sub-electrode, 11A: narrow portion,
12: Organic layer, 12A: Light emitting layer,
13: 2nd electrode, 14: Wiring, 15: Laminate part, 16: Insulating film, 20: Feeding part,
Lu: luminescence unit, Ls: sub-luminescence unit

[0002]
And the function of injecting holes and electrons into the organic layer cannot be obtained, and the organic EL element becomes defective in light emission.
[0006]
In an organic EL panel in which a plurality of organic EL elements are arranged on a substrate, when one organic EL element becomes defective in light emission due to the short circuit between the pair of electrodes described above, a display obtained by causing one organic EL element to emit light A function such as illumination cannot be obtained, and the quality of the organic EL panel is deteriorated. For example, when three adjacent organic EL elements emit light in different colors and color display is performed by combining three colors, a desired composite color can be obtained when one of the three organic EL elements becomes defective in light emission. This results in a problem that the quality of the color display deteriorates.
[0007]
This invention makes it an example of a subject to cope with such a problem. That is, an object of the present invention is to maintain the light emitting function of one organic EL element even if a short circuit occurs between a pair of electrodes and to suppress deterioration in the quality of the organic EL panel.
Means for Solving the Problems [0008]
In order to achieve such an object, the organic EL panel according to the present invention has at least the following configuration.
An organic EL panel in which a plurality of organic EL elements are arranged on a substrate, wherein the organic EL element has a structure in which a first electrode, an organic layer, and a second electrode are stacked, and one organic EL element is Constituting one light-emitting unit, the first electrode comprises a sub-electrode having a plurality of independent electrode patterns for each organic EL element, and constituting a sub-light-emitting unit that divides the light-emitting unit for each sub-electrode, A wiring for supplying electricity to each sub-electrode of the first electrode, the wiring has a protrusion, and the sub-electrode has a narrow portion having a width narrower than a width in one direction of the sub-electrode; 2. The organic EL panel according to claim 1, wherein the sub-electrode and the wiring are connected in a laminated portion in which a part of the narrow part and a part of the protruding part are laminated.
BRIEF DESCRIPTION OF THE DRAWINGS [0009]
FIG. 1 is an explanatory view showing the structure of an organic EL panel according to an embodiment of the present invention (same drawing)

Claims (7)

An organic EL panel in which a plurality of organic EL elements are arranged on a substrate,
The organic EL element has a structure in which a first electrode, an organic layer, and a second electrode are stacked, and one organic EL element constitutes one light emitting unit,
The first electrode includes a sub-electrode having a plurality of independent electrode patterns for each organic EL element, and constitutes a sub-light-emitting unit that divides the light-emitting unit for each sub-electrode,
A wiring for supplying electricity to each sub-electrode of the first electrode;
The sub-electrode and the wiring are connected in a stacked portion in which a part of the sub-electrode and a part of the wiring are stacked,
An organic EL panel, wherein a part of the sub-electrode in the vicinity of the laminated part has a narrow part having a width narrower than a width of the sub-electrode in one direction.   2. The organic EL panel according to claim 1, wherein a specific resistance of the sub electrode is larger than a specific resistance of the wiring.   The wiring has a striped pattern along one direction, a plurality of the first electrodes are formed along the wiring, and the second electrode has a striped pattern in a direction intersecting the wiring. The organic EL panel according to claim 1 or 2.   The area of the laminated part is larger than the area of the sub-electrode where the distance from the power supply part that flows current to the wiring to the narrow-width part is far, and the area of the sub-electrode is closer to the narrow-width part. The organic EL panel according to claim 1, which is large.   The organic EL panel according to claim 1, wherein a plurality of adjacent organic EL elements emit light in different colors.   The organic EL panel according to claim 5, wherein the number of the sub-electrodes is different between the organic EL element that emits light in the first color and the organic EL element that emits light in the second color.   The organic EL panel according to claim 1, wherein the sub-electrode and the wiring are divided at the narrow portion.

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