JP2016181412A - Organic el lighting panel and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL lighting panel capable of evenly making the light emitting surface emit light with a simple configuration.SOLUTION: Disclosed is an organic EL lighting panel 1 in which a first electrode 3; an organic EL layer 4, and a second electrode 5 are formed on a substrate 2. This panel includes: a first electrode terminal part 3a which is formed in the outside of the organic EL layer 4 along the outer edge of the organic EL layer 4 and connected to the first electrode 3; and a second electrode terminal part 5a which is formed in the outside of the organic EL layer 4 along the outer edge of the organic EL layer 4 and connected to the second electrode 5. A conductive adhesive tape 7 is stuck onto the first electrode terminal part 3a and the second electrode terminal part 5a along the outer edge of the organic EL layer 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an organic EL lighting panel and a manufacturing method thereof.

  Incandescent lamps and fluorescent lamps have long been used as lighting devices, and LEDs are often used as light sources for various display devices such as televisions, smartphones, and PC monitors. In recent years, in addition to this type of light-emitting device, a light-emitting element (hereinafter referred to as “organic EL element”) in which a functional organic thin film layer (hereinafter referred to as “organic EL layer”) that emits light when an electric current is passed is sandwiched between electrodes Development of light-emitting devices using the LED is progressing.

JP 2009-130132 A

  The organic EL element has a structure in which both sides of an organic EL film having a thickness of several hundred nm composed of a hole transport layer (HTL), a light emitting layer (EML), and an electron transport layer (ETL) are sandwiched between electrodes. When a voltage is applied to the electrodes at both ends, electrons from the cathode and holes from the anode flow into the organic EL film, move through the organic EL film, and recombine in the light emitting layer, so that the organic molecules in the light emitting layer emit light. To do.

  In organic EL lighting using an organic EL element as a lighting device, it is necessary to uniformly inject electrons and holes into an electrode in order to emit light uniformly on a light emitting surface. For this reason, in the structure which connects the 1st, 2nd electrode terminal part pulled out around the organic EL element, and a control board via a flexible substrate, organic EL illumination shown to FIG. 7 (A) (B) As in the panel 100, the first electrode terminal portion 102 a connected to the first electrode 102 and the second electrode terminal portion 103 a connected to the second electrode 103 are disposed around the organic EL element 101. A configuration in which the flexible substrate 105 is anisotropically connected through the anisotropic conductive film 104 while being alternately drawn out has also been proposed.

  However, this configuration requires anisotropic conductive connection between the first and second electrode terminal portions 102a and 103a alternately drawn in one side of the organic EL element 101 and the flexible substrate 105, and the necessary flexible There are many substrates 105, and the number of manufacturing steps increases. Furthermore, since an expensive anisotropic conductive film is used, it has contributed to an increase in manufacturing cost.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an organic EL lighting panel that can emit light evenly on a light emitting surface with a simple configuration and a method for manufacturing the same.

  In order to solve the above-described problems, an organic EL lighting panel according to the present invention is an organic EL lighting panel in which a first electrode, an organic EL layer, and a second electrode are formed on a substrate. Formed along the outer edge of the organic EL layer, connected to the first electrode, and formed along the outer edge of the organic EL layer outside the organic EL layer. A second electrode terminal portion connected to the second electrode, and conductive on the first electrode terminal portion and the second electrode terminal portion along the outer edge of the organic EL layer. Adhesive tape is affixed.

  Moreover, the manufacturing method of the organic EL lighting panel according to the present invention is the manufacturing method of the organic EL lighting panel in which the first electrode, the organic EL layer, and the second electrode are formed on the substrate. Formed along the outer edge of the organic EL layer, connected to the first electrode, and formed along the outer edge of the organic EL layer outside the organic EL layer. A second electrode terminal portion connected to the second electrode, and conductive on the first electrode terminal portion and the second electrode terminal portion along the outer edge of the organic EL layer. Adhesive tape is attached.

  According to the present invention, the first electrode terminal portion and the second electrode terminal portion are formed along the outer edge of the organic EL layer, and the conductive adhesive tape is attached. Thereby, since an electron and a hole are uniformly inject | poured into the electrode of the whole surface of an organic electroluminescent layer, this invention can make a light emission surface light-emit uniformly.

  Moreover, in the organic EL lighting panel in which the first electrode terminal portions and the second electrode terminal portions are alternately formed over one side of the organic EL layer, it is necessary to connect a plurality of connecting members using an anisotropic conductive film. On the other hand, according to the present invention, the conductive adhesive tape can be used to connect to the power supply device, and the number of parts and the number of manufacturing steps can be reduced.

1A and 1B are diagrams showing an organic EL lighting panel to which the present invention is applied, in which FIG. 1A is a sectional view, and FIG. 1B is an organic EL layer, first and second electrodes, and first and second electrodes. It is a top view which shows the electroconductive adhesive tape affixed on the terminal part. FIG. 2 is a cross-sectional view showing a conductive adhesive tape. FIG. 3 is a plan view showing a process of folding and connecting the ends of the conductive adhesive tape. FIG. 4 is a plan view showing a process of folding the end portion of the conductive adhesive tape and connecting it to the adjacent electrode terminal portion. FIG. 5 shows a first example in which a conductive adhesive tape is affixed on the second electrode terminal portion formed continuously along the three sides of the rectangular organic EL layer, and the first electrode formed along the remaining one side. It is a top view which shows the organic electroluminescent lighting panel which affixed the electroconductive adhesive tape on the electrode terminal part. FIG. 6 is a view showing an organic EL lighting panel in which a first electrode and a first electrode terminal portion are formed on a substrate, and a second electrode and a second electrode terminal portion are formed on a cover member. ) Is a cross-sectional view, and (B) is a plan view. 7A and 7B are diagrams showing an organic EL lighting panel in which first and second electrodes are alternately formed along one side of the organic EL layer, where FIG. 7A is a plan view and FIG. 7B is a cross-sectional view. .

  Hereinafter, an organic EL lighting panel to which the present invention is applied and a manufacturing method thereof will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention. Further, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Specific dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Structure 1 of organic EL lighting panel]
As shown in FIG. 1A, the organic EL lighting panel 1 includes a first electrode 3, an organic EL layer 4, a second electrode 5, and a cover member 6 stacked in this order on a substrate 2. It is configured. In addition, the organic EL lighting panel 1 is provided with a first electrode terminal portion 3 a connected to the first electrode 3 and a second electrode terminal portion 5 a connected to the second electrode 5 on the outer edge portion of the substrate 2. In addition, the conductive adhesive tape 7 is affixed to the first and second electrode terminal portions 3a and 5a. The organic EL lighting panel 1 emits light when electric power is supplied between the first and second electrodes 3 and 5 via the conductive adhesive tape 7.

  The substrate 2 is a glass substrate, for example, and the first and second electrodes 3 and 5 can be made of a known organic EL element electrode material, for example, ITO (Indium Tin Oxide) or IGZO used as a transparent electrode. Or a metal film, a metal wiring, or the like. In the organic EL lighting panel 1 shown in FIG. 1, the first electrode 3 laminated on the substrate 2 is formed of a metal such as aluminum and has a function of reflecting light, and the second electrode 5 is made of, for example, ITO. Is formed in a mesh shape, and is formed as a so-called top emission type in which light from the organic EL layer 4 is extracted from the cover member 6 side. As the cover member 6, a glass substrate or a film can be used.

  As shown in FIG. 1B, the first electrode 3 is formed outside the organic EL layer 4 up to a position where it does not overlap with the second electrode 5, and the region formed at the position where it does not overlap is electrically conductive. It becomes the 1st electrode terminal part 3a to which the adhesive tape 7 is affixed.

  The second electrode 5 is formed up to a position that does not overlap the first electrode 3 outside the organic EL layer 4, and a second electrode terminal portion provided outside the organic EL layer 4 of the substrate 2. 5a is connected. The 2nd electrode terminal part 5a is comprised by transparent electrodes, such as ITO, and the conductive adhesive tape 7 is affixed.

  The second electrode 5 and the second electrode terminal portion 5a are connected by a conductive layer 8 such as a metal foil or a conductive adhesive film. The second electrode terminal portion 5a is provided with an insulating layer 9 between the first electrode 3 and a short circuit is prevented. The insulating layer 9 can be configured, for example, by applying an insulating adhesive or disposing an insulating resin material.

[Conductive adhesive tape]
The conductive adhesive tape 7 is affixed to the first electrode terminal portion 3a and the second electrode terminal portion 5a, and one end is connected to a power supply device (not shown) to apply a predetermined voltage to the organic EL layer 4. Is. As shown in FIG. 2, the conductive adhesive tape 7 is configured by laminating an adhesive layer 11 on a conductive substrate 10.

  The conductive substrate 10 is made of a conductive material, and for example, copper, aluminum, iron, gold, silver, nickel, palladium, chromium, molybdenum, and alloys thereof can be used. Moreover, the electroconductive base material 10 is formed in the tape shape according to the shape of the 1st, 2nd electrode terminal parts 3a and 5a.

  Further, the conductive substrate 10 may have a single layer structure or a laminated structure. Examples of the single layer structure include a single layer structure made of copper, aluminum, or the like. Examples of the laminated structure include a laminated structure having a base material made of copper, aluminum or the like and a plating layer. Examples of the material for the plating layer include gold, silver, tin, and solder.

  In addition, when the adhesive in the adhesive layer 11 is an insulating adhesive, the conductive base material 10 has an adhesive layer 11 side in order to establish conduction with the first and second electrode terminal portions 3a and 5a. It is preferable to have protrusions on the surface.

  The adhesive layer 11 is a conductive adhesive layer or an insulating adhesive layer, and can be appropriately selected depending on the purpose.

  Examples of the conductive adhesive include a film-forming resin, a curable resin, a curing agent, and conductive particles 11a, and a conductive adhesive containing other components as necessary. It is done.

  Examples of the film-forming resin include phenoxy resin, unsaturated polyester resin, saturated polyester resin, urethane resin, butadiene resin, polyimide resin, polyamide resin, and polyolefin resin. These may be used individually by 1 type and may use 2 or more types together. Among these, phenoxy resin is particularly preferable.

  Examples of the curable resin include an epoxy resin and an acrylate resin. The curable resin may be cured alone or may be cured with a curing agent. Examples of the curing agent include imidazoles represented by 2-ethyl 4-methylimidazole; lauroyl peroxide, butyl peroxide, benzyl peroxide, dilauroyl peroxide, dibutyl peroxide, benzyl peroxide, peroxydicarbonate. And organic peroxides such as benzoyl peroxide; anionic curing agents such as organic amines; and cationic curing agents such as sulfonium salts, onium salts, and aluminum chelating agents. Among these, combinations of epoxy resins and imidazoles, and combinations of acrylate resins and organic peroxides are particularly preferable.

  Examples of the conductive particles 11a include nickel particles, gold-coated nickel particles, resin particles in which a resin core is coated with Ni, resin particles in which a resin core is coated with Ni, and the outermost surface is coated with Au.

  Examples of other components include silane coupling agents, fillers, softeners, accelerators, anti-aging agents, colorants (pigments and dyes), organic solvents, and ion catchers.

  Examples of the insulating adhesive include an insulating adhesive containing a film-forming resin, a curable resin, and a curing agent, and further containing other components as necessary. Examples of the film-forming resin, curable resin, curing agent, and other components in the insulating adhesive include the film-forming resin, curable resin, curing agent, and other components exemplified in the description of the conductive adhesive. It is done.

  The conductive adhesive tape 7 may be produced by any method, but can be produced by the following method, for example. An adhesive composition containing an additive such as a film-forming resin, a curable resin, a curing agent, and a silane coupling agent that constitutes the adhesive layer 11, and conductive particles 11a is prepared. The adjusted adhesive composition is applied onto the conductive substrate 10 using a bar coater, a coating apparatus, and the like, and dried by an oven or the like, whereby the conductive substrate 10 is laminated and supported by the adhesive layer 11. The adhesive tape 7 is obtained.

  The conductive adhesive tape 7 is manufactured as a wound body by laminating the adhesive layer 11 and the release film and then winding the conductive adhesive tape 7 in a roll shape for a predetermined length. As the release film, any film that can be peeled off from the adhesive layer 11 can be used, and examples thereof include a polyethylene terephthalate film in which a release agent is applied on one surface thereof.

  The conductive adhesive tape 7 wound in a roll shape is cut into a predetermined length at the time of use, and after the release film is peeled off, it is temporarily attached to the first and second electrode terminal portions 3a and 5a. After that, the conductive adhesive tape 7 is thermally pressed by the pressure bonding head from the conductive substrate 10 side, whereby the adhesive layer 11 is cured, and the conductive substrate 10 and the first and second electrode terminal portions. 3a and 5a are conductively connected.

  Moreover, one end of the conductive adhesive tape 7 is connected to a power supply device (not shown) through a connection member such as a flexible circuit board as appropriate. Therefore, in the organic EL lighting panel 1, the first electrode terminal portion 3 a and the second electrode terminal portion 5 a are drawn from each end of the conductive adhesive tape 7, so that the current path can be easily routed.

[First and second electrode terminal portions]
Here, in the organic EL lighting panel 1, the first electrode terminal portion 3a and the second electrode terminal portion 5a are formed along the outer edge of the organic EL layer 4, and the conductive adhesive tape 7 is applied. Yes. The conductive adhesive tape 7 is connected to a power supply device (not shown) and supplies power between the first and second electrodes 3 and 5. Thereby, since the organic EL lighting panel 1 injects electrons and holes over the entire surface of the organic EL layer 4, the light emitting surface can emit light.

  In the organic EL lighting panel 1, the organic EL layer 4 is formed in a polygonal shape, for example, a rectangular shape, and the first electrode terminal portion 3 a and the second electrode terminal portion 5 a are formed along the outer edge of the organic EL layer 4. It is preferably formed over one side of the lighting panel 1. Thereby, the organic EL lighting panel 1 uses an anisotropic conductive film in the organic EL lighting panel in which the first electrode terminal portions and the second electrode terminal portions are alternately formed over one side of the organic EL layer. While it is necessary to connect a plurality of connecting members, the conductive adhesive tape 7 is used to conduct electricity to the first and second electrode terminal portions 3a and 5a formed along the outer edge of the organic EL layer 4, respectively. By attaching the adhesive tape 7, the first and second electrodes 3 and 5 and the power supply device can be connected, and the number of parts and the number of manufacturing steps can be reduced.

  Moreover, in the organic EL lighting panel in which the first electrode terminal portions and the second electrode terminal portions are alternately formed over one side of the organic EL layer, the first electrode terminal portion or the second electrode terminal is provided on each side. While the wiring is complicated to connect the FPC and the like connected to the unit, the organic EL lighting panel 1 has the first electrode terminal unit 3a or the second electrode terminal unit 5a over one side of the organic EL layer 4. Since it is formed, each electrode can be taken out from each end of the conductive adhesive tape 7, and wiring can be simplified.

  The organic EL lighting panel 1 has a plurality of outer edges in which the organic EL layer 4 is formed in a rectangular shape, and the first electrode terminal portion 3 a and / or the second electrode terminal portion 5 a are continuous with the organic EL layer 4. It is preferable that the conductive adhesive tape 7 is stuck along a plurality of continuous sides. Thereby, since the organic EL lighting panel 1 uniformly injects electrons and holes into the electrodes on the entire surface of the organic EL layer 4, the light emitting surface can emit light evenly.

  For example, in the organic EL lighting panel 1, the organic EL layer 4 is formed in a substantially square shape, and the first electrode terminal portion 3 a and the second electrode terminal portion 5 a are respectively along two continuous sides of the organic EL layer 4. The conductive adhesive tape 7 is affixed over the two continuous sides.

  In the organic EL lighting panel 1, the first and second electrode terminal portions 3a and 5a are formed over two continuous sides of the substantially square organic EL layer 4, respectively. The electrode 5 is surrounded by the pair of second electrode terminal portions 5a with the length of one side of the organic EL layer 4 being also separated in the vicinity of the second corner portion 5b which is the farthest from the second electrode terminal portion 5a. The substantially uniform voltage distribution region is expanded to the vicinity of the second corner 5b. As a result, the organic EL layer 4 uniformly injects electrons and holes in the vicinity of the second corner portion 5b as well as the other regions of the organic EL layer 4, so that the light emitting surface emits light evenly. be able to.

  As shown in FIG. 3, the conductive adhesive tape 7 is attached to each side of the first electrode terminal portion 3 a, and the first electrode terminal portion 3 a adjacent to each other at the end where the first electrode terminal portion 3 a continues over two sides. It can be connected by thermocompression bonding with the end portion of the conductive adhesive tape 7 affixed to the electrode terminal portion 3a. The conductive adhesive tape 7 can be similarly attached to the second electrode terminal portion 5a.

  Alternatively, as shown in FIG. 4, the conductive adhesive tape 7 has a length corresponding to two sides of the first electrode terminal portion 3 a, and the first electrode terminal portion 3 a is continuous at two ends, The adhesive layer 11 may be continuously applied over two sides by being bent so as to be on the side of the adjacent first electrode terminal portion 3a. The conductive adhesive tape 7 can be similarly attached to the second electrode terminal portion 5a.

  As shown in FIG. 5, when the organic EL lighting panel 1 is formed in a square shape, the organic EL lighting panel 1 has a second electrode terminal connected to the relatively high-resistance second electrode 5. The portion 5 a is formed continuously over the three sides of the organic EL layer 4, and the first electrode terminal portion 3 a connected to the relatively low-resistance first electrode 3 is formed over the one side of the organic EL layer 4. May be. By forming the second electrode terminal portion 5a continuously over the three sides of the organic EL layer 4, the second electrode 5 having a relatively high resistance is surrounded by the second electrode terminal portion 5a. In addition, since the substantially uniform voltage distribution region extends to the entire surface of the second electrode 5 and electrons and holes are uniformly injected, the light emitting surface can emit light evenly. The organic EL lighting panel 1 has the organic EL layer 4 formed in a polygonal shape other than a square shape, and the second electrode 5 having a relatively high resistance has more than half the sides by the second electrode terminal portion 5a. By forming the second electrode terminal portion 5a so as to be surrounded, the light emitting surface can similarly emit light without unevenness.

  When the organic EL layer 4 is formed in a square shape, the length of one side is preferably less than 70 mm. By making the length of one side of the organic EL layer 4 less than 70 mm, the second electrode 5 having high resistance can be organic even in the vicinity of the second corner 5b that is farthest from the second electrode terminal 5a. The second electrode terminal portion 5a continuous over two sides of the EL layer 4 is included in a region having a substantially uniform potential distribution, and electrons and holes are uniformly injected as in the other regions of the organic EL layer 4. Therefore, the light emitting surface can emit light without unevenness.

  In the organic EL lighting panel 1, when the organic EL layer 4 is formed in a rectangular shape, the length of the long side is not limited as long as the length of the short side is less than 70 mm. By setting the length of the short side of the organic EL layer 4 to less than 70 mm, as described above, electrons and holes are uniformly injected in the same manner as in other regions of the organic EL layer 4, so that the light emitting surface is uneven. It can be made to emit light.

  In addition, the organic EL lighting panel 1 seals the organic EL layer 4 by providing a sealing material 12 between the outer edge portion of the substrate 2 and the cover member 6 on the second electrode 5, and is made of moisture or oxygen. Prevents adverse effects. As the sealing material 12, a known sealing material having high moisture resistance and adhesiveness can be used.

  In the organic EL lighting panel 1 thus configured, the conductive adhesive tape 7 is applied to the first and second electrode terminal portions 3a and 5a formed along the outer edge of the organic EL layer 4 on the substrate 2. The conductive adhesive tape 7 is connected to a power supply device through each end. Therefore, the organic EL lighting panel 1 has the number of parts as compared with the configuration in which the first and second electrode terminal portions are alternately drawn out on one side of the organic EL layer 4 and the anisotropic conductive connection is made with the flexible substrate. Manufacturing man-hours can be reduced.

  In addition, the organic EL lighting panel 1 configured as described above has a second electrode facing the first electrode 11 through the conductive adhesive tape 7 and the first and second electrode terminal portions 3a and 5a from the power supply device. A voltage is applied to the electrode 5 so that the organic EL layer 4 emits light and is emitted from the cover member 6 side. At this time, according to the organic EL lighting panel 1, the first and second electrode terminal portions 3 a and 5 a are formed over one side of the organic EL layer 4 formed in a square shape, and over one side of the organic EL layer 4. By applying the conductive adhesive tape, a substantially uniform voltage distribution region extends to the entire surface of the second electrode 5 and electrons and holes are uniformly injected, so that the light emitting surface can emit light uniformly. it can. The organic EL lighting panel 1 may be configured as a so-called bottom emission type in which light from the organic EL layer 4 is extracted from the transparent substrate 2 side.

[Organic EL lighting panel structure 2]
The organic EL lighting panel to which the present invention is applied may be configured as follows. In addition, in the following description, the same code | symbol is attached | subjected about the same member as the organic EL lighting panel 1 mentioned above, and the detail is abbreviate | omitted.

  An organic EL lighting panel 20 shown in FIG. 6A is configured by laminating a first electrode 3, an organic EL layer 4, a second electrode 5, and a cover member 6 in this order on a substrate 2. Yes. Further, the organic EL lighting panel 20 is provided with the first electrode terminal portion 3 a connected to the first electrode 3 at the outer edge portion of the substrate 2, and connected to the second electrode 5 at the outer edge portion of the cover member 6. The second electrode terminal portion 5a is provided. A conductive adhesive tape 7 is affixed to the first and second electrode terminal portions 3a and 5a. The organic EL lighting panel 1 emits light when electric power is supplied between the first and second electrodes 3 and 5 via the conductive adhesive tape 7.

  As shown in FIG. 6B, the first electrode 3 is formed outside the organic EL layer 4 up to a position where it does not overlap with the second electrode 5, and the region formed at the position where it does not overlap is electrically conductive. It becomes the 1st electrode terminal part 3a to which the adhesive tape 7 is affixed. In addition, the second electrode 5 is formed up to a position that does not overlap the first electrode 3 outside the organic EL layer 4, and the conductive adhesive tape 7 is attached to a region formed at the position that does not overlap. It becomes the 2nd electrode terminal part 5a.

  In the organic EL lighting panel 20, the sealing material 9 is provided between the outer edge portion of the substrate 2 and the cover member 6, thereby sealing the organic EL layer 4 and preventing adverse effects due to moisture and oxygen. The organic EL lighting panel 20 may be configured as a so-called top emission type in which light from the organic EL layer 4 is extracted from the transparent cover member 6 side as shown in FIG. You may comprise as what is called a bottom emission type from which light is taken out from the transparent substrate 2 side.

  According to the organic EL lighting panel 20, the first electrode 3 and the first electrode terminal portion 3 a are formed on the substrate 2, and the second electrode 5 and the second electrode terminal portion 5 a are formed on the cover member 6. Thus, as compared with the organic EL lighting panel 1, the conductive layer 8 that pulls out the second electrode 5 toward the substrate 2 and the insulating layer 9 that insulates the first electrode 3 from the second electrode terminal portion 5a become unnecessary. Thus, the configuration is simple, and the number of manufacturing steps can be reduced.

  Next, examples of the present invention will be described. In this example, an organic EL lighting panel in which the dimension (mm) in the XY direction of the organic EL layer 4 formed in a square shape or a rectangular shape was changed was prepared, and the degree of light emission unevenness was evaluated. The organic EL lighting panel according to the example and the reference example has the same configuration as the organic EL lighting panel 1 or the organic EL lighting panel 20 described above, and the organic EL lighting panel according to the comparative example is the organic EL lighting panel 100 described above. Has the same configuration.

[Example 1]
The organic EL layer according to Example 1 is formed in a square shape, and the dimensions in the XY directions are all 25 mm. Each of the first and second electrode terminal portions is formed along two continuous sides of the organic EL layer, and a conductive adhesive tape is applied to the two continuous sides. Further, in the organic EL lighting panel according to Example 1, the first and second electrode terminal portions are formed on the same surface of the substrate, similarly to the organic EL lighting panel 1 described above.

[Example 2]
The organic EL layer according to Example 2 is formed in a rectangular shape having a dimension in the X direction of 70 mm and a dimension in the Y direction of 25 mm. Other configurations are the same as those of the first embodiment.

[Example 3]
The organic EL layer according to Example 3 is formed in a rectangular shape having a dimension in the X direction of 270 mm and a dimension in the Y direction of 25 mm. Other configurations are the same as those of the first embodiment.

[Example 4]
The organic EL layer according to Example 4 is formed in a square shape, and the dimensions in the XY directions are all 50 mm. Other configurations are the same as those in the first embodiment.

[Example 5]
In the organic EL lighting panel according to Example 5, the first electrode terminal portion is formed on the substrate and the second electrode terminal portion is formed on the cover member, similarly to the organic EL lighting panel 20 described above. Other configurations are the same as those in the first embodiment.

[Example 6]
In the organic EL lighting panel according to Example 6, similarly to the organic EL lighting panel 20 described above, the first electrode terminal portion is formed on the substrate, and the second electrode terminal portion is formed on the cover member. Other configurations are the same as those in the fourth embodiment.

[Example 7]
In the organic EL lighting panel according to Example 7, the second electrode terminal portion connected to the relatively high-resistance second electrode is formed along three continuous sides of the organic EL layer, and the first The electrode terminal portion was formed along the remaining one side. Other configurations are the same as those of the fifth embodiment.

[Example 8]
In the organic EL lighting panel according to Example 8, the second electrode terminal portion connected to the relatively high-resistance second electrode is formed along three continuous sides of the organic EL layer, and the first The electrode terminal portion was formed along the remaining one side. Other configurations are the same as those of the sixth embodiment.

[Example 9]
The organic EL layer according to Example 9 is formed in a square shape, and the dimension in the XY direction is 70 mm. Other configurations are the same as those of the seventh and eighth embodiments.

[Comparative Example 1]
The organic EL layer according to Comparative Example 1 is formed in a square shape, and the dimension in the XY direction is 70 mm. The first and second electrode terminal portions are alternately formed along each side of the organic EL layer, and pasted on the first and second electrode terminal portions along each side of the organic EL layer. It is connected to a flexible substrate (FPC) by an anisotropic conductive film (ACF). Further, in the organic EL lighting panel according to Comparative Example 1, the first and second electrode terminal portions are formed on the same surface of the substrate, similarly to the organic EL lighting panel 1 described above.

[Reference Example 1]
The organic EL layer according to Reference Example 1 is formed in a square shape, and the dimensions in the XY directions are all 70 mm. Other configurations are the same as those in the first embodiment.

[Reference Example 2]
The organic EL layer according to Reference Example 2 is formed in a square shape, and the dimensions in the XY directions are all 70 mm. Other configurations are the same as those in the fourth embodiment.

[Light emission unevenness]
The conductive adhesive tape or FPC of the organic EL lighting panel according to the above-described Examples, Comparative Examples, and Reference Examples was connected to a power supply device, and the light emission state when the organic EL layer was caused to emit light was visually observed and evaluated. . As a result, when the light emission unevenness does not occur over the entire light emitting surface, ○, when the light emission unevenness occurs in the range of less than 5% of the light emitting surface, Δ, when the light emission unevenness occurs in the range of 5% or more of the light emitting surface. X.

[Panel costs and connecting material costs]
Moreover, the manufacturing cost and connection member cost of the organic EL lighting panel according to the above-described examples, comparative examples, and reference examples were evaluated, and the circles were set in the order of the cost in the order of ◯, Δ, and X.

  As shown in Table 1, in Examples 1 to 9, since a conductive adhesive tape is used as a connecting member and is attached to the first and second electrode terminal portions formed over one side of the organic EL layer, light emission There was no light emission unevenness on the entire surface, or the range of light emission unevenness was less than 5% of the light emitting surface. Moreover, in Examples 1-9, since it can connect with an electric power supply apparatus by affixing a conductive adhesive tape on the 1st, 2nd electrode terminal part formed over the organic EL layer side, the number of parts In addition, the number of manufacturing steps is small, and the panel cost and connecting member cost can be suppressed. It should be noted that Examples 5 to 9 provided on different substrates are more advantageous in terms of panel cost and structure, rather than Examples 1 to 4 in which the first and second electrode terminal portions are drawn out on the same substrate. there were.

  On the other hand, in Comparative Example 1, first and second electrode terminal portions are alternately formed along each side of the organic EL layer, and the first and second electrode terminal portions are formed along each side of the organic EL layer. Since the anisotropic conductive film (ACF) affixed to the substrate is connected to the flexible printed circuit (FPC), light emission unevenness is suppressed, but the number of parts and manufacturing steps increase, and the panel cost and connecting member cost increase. did.

  In the reference examples 1 and 2 in which the dimensions in the XY direction are both 70 mm and the number of the first and second electrode terminal portions is two on each side under the conditions such as the member and applied voltage in the present embodiment. Caused uneven luminescence. On the other hand, in Example 9 in which the dimensions in the XY directions are all 70 mm and the number of the second electrode terminal portions connected to the relatively high-resistance second electrodes is three sides, the light emission unevenness is suppressed. It was.

DESCRIPTION OF SYMBOLS 1,20 Organic EL lighting panel, 2 board | substrate, 3 1st electrode, 3a 1st electrode terminal part, 4 organic EL layer, 5 2nd electrode, 5a 2nd electrode terminal part, 6 cover member, 7 electroconductivity Adhesive tape, 8 conductive layer, 9 insulating layer, 10 conductive substrate, 11 adhesive layer

Claims (8)

In an organic EL lighting panel in which a first electrode, an organic EL layer, and a second electrode are formed on a substrate,
A first electrode terminal formed outside the organic EL layer along the outer edge of the organic EL layer and connected to the first electrode;
A second electrode terminal portion formed on the outer side of the organic EL layer along the outer edge of the organic EL layer and connected to the second electrode;
An organic EL lighting panel in which a conductive adhesive tape is affixed along the outer edge of the organic EL layer on the first electrode terminal portion and the second electrode terminal portion.   The organic EL lighting panel according to claim 1, wherein the organic EL layer is formed in a square shape, and the first electrode terminal portion and the second electrode terminal portion are respectively formed over one side of the organic EL layer.   The organic EL lighting panel according to claim 2, wherein the conductive adhesive tape is affixed over a plurality of continuous sides of the first electrode terminal portion and / or the second electrode terminal portion.   The first electrode terminal portion or the second electrode terminal portion connected to a relatively high resistance electrode is formed over three sides of the organic EL layer, and is connected to a relatively low resistance electrode. The organic EL lighting panel according to claim 2, wherein the second electrode terminal portion or the first electrode terminal portion is formed over one side of the organic EL layer.   The organic EL layer has a side length of less than 70 mm when formed in a square shape, and a short side length of less than 70 mm when formed in a rectangular shape. The organic EL lighting panel described.   The organic EL lighting panel according to any one of claims 1 to 5, wherein the first electrode terminal portion and the second electrode terminal portion are formed on the substrate.   The said 1st electrode terminal part is formed in the said board | substrate, and the said 2nd electrode terminal part is formed in the cover member arrange | positioned on the said organic EL layer. The organic EL lighting panel described. In the manufacturing method of the organic EL lighting panel in which the first electrode, the organic EL layer, and the second electrode are formed on the substrate,
A first electrode terminal formed outside the organic EL layer along the outer edge of the organic EL layer and connected to the first electrode;
Forming along the outer edge of the organic EL layer on the outside of the organic EL layer, forming a second electrode terminal portion connected to the second electrode,
The manufacturing method of the organic electroluminescent illumination panel which affixes a conductive adhesive tape on the said 1st electrode terminal part and the said 2nd electrode terminal part along the outer edge of the said organic EL layer.

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