JP2014186932A - Organic EL module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL module capable of emitting light on both surfaces and independently supplying power to organic EL panels.SOLUTION: Two bottom emission type organic EL panels 2 and 3 are provided. In each of the bottom emission type organic EL panels 2 and 3, an organic EL element 20 including a first electrode layer, a functional layer and a second electrode layer is provided on a surface of an insulation substrate 12, and light is extracted from a side of the insulation substrate 12, and the two bottom emission type organic EL panels 2 and 3 are overlapped in such a manner that the surfaces of the insulation substrates 12 oppose each other. The two organic EL panels 2 and 3 include lateral side electrode layers 21 and 22 spread in a surface shape on at least two lateral sides of the substrates 12 and in a planar view of the insulation substrates 12, the lateral side electrode layers 21 and 22 of the two organic EL panels 2 and 3 are positioned over three sides.

Description

  The present invention relates to an organic EL (Electro Luminescence) module. In particular, the present invention relates to a double-sided organic EL module in which a plurality of bottom emission type organic EL devices are bonded together.

  In recent years, organic EL modules have attracted attention as a lighting device that can replace incandescent lamps and fluorescent lamps, and many studies have been made.

Here, the organic EL module is a combination of organic EL panels. The organic EL panel is obtained by applying a sealing structure and a casing to an organic EL device. In the organic EL device, an organic EL element is laminated on a base material such as a glass substrate, and a power feeding structure for the organic EL element is provided.
In addition, the organic EL element has two or more light-transmitting electrodes facing each other, and a light emitting layer made of an organic compound is laminated between the electrodes. The organic EL device emits light by the energy of recombination of electrically excited electrons and holes.
The organic EL panel is a self-luminous device and can emit light of various wavelengths by appropriately selecting a material of the light emitting layer. Further, since the thickness is extremely thin compared to incandescent lamps and fluorescent lamps, and the light is emitted in a planar shape, there are few restrictions on the installation location.

Incidentally, an organic EL panel used as a lighting device is generally configured to emit light on one main surface (one surface) side by stacking organic EL elements on one substrate. That is, the main surface has a light emitting surface, and the light emitting surface is directed to a space such as a living space, so that the space is illuminated. In addition, since the organic EL panel is surface emitting, the amount of light radiated into the space is small compared to LED lighting that collects light at a single point, and how to increase the amount of light is an issue. ing.
Therefore, as a measure for increasing the amount of light of the organic EL panel, the technique of Patent Document 1 is disclosed.
The double-sided light-emitting organic EL electroluminescent illumination device (organic EL module) described in Patent Document 1 extends the light-emitting area and increases the total light amount by overlapping two organic EL devices to emit light on both sides. .

JP 2010-232099 A

  In the organic EL module described in Patent Document 1, extraction electrodes for supplying power to an internal organic light emitting unit are arranged on one side of the organic EL panel. Therefore, as described in Patent Document 1, when each organic electroluminescence element substrate (organic EL panel) is electrically connected in parallel, it is close to the extraction electrode for supplying power to the internal organic light emitting unit. There is a problem that the luminance of the region is high, the luminance is low in a region away from the one side, and uneven luminance is likely to occur when viewed as a whole of the organic EL module. Therefore, Patent Document 1 suppresses the occurrence of luminance unevenness by electrically connecting the organic EL panels in series.

  However, when the organic EL panels are electrically connected in series, each organic EL panel cannot be controlled independently, and both sides always emit light during driving. For this reason, the method of lighting cannot be changed depending on the intended use, and it has become inconvenient.

  Therefore, the present invention provides an organic EL module that can emit light on both sides and can supply power to each organic EL panel independently.

  Invention of Claim 1 for solving said subject has a laminated body provided with the 1st electrode layer, the organic light emitting layer, and the 2nd electrode layer on the surface of a polygonal substrate, The above-mentioned An organic EL module comprising at least two bottom emission type organic EL panels for extracting light from the substrate side, wherein the two organic EL panels are stacked so that the surfaces of the substrates face each other. The two organic EL panels have at least two power supply portions extending in a planar shape on the two side surfaces of the substrate, and when the substrate is viewed in plan, the power supply portions of the two organic EL panels Is an organic EL module characterized by being located on three sides.

According to the configuration of the present invention, the two organic EL panels have a power feeding unit having a planar spread on at least two side surfaces of the substrate. That is, of the two organic EL panels, one organic EL panel (hereinafter also referred to as a first organic EL panel) and the other organic EL panel (hereinafter also referred to as a second organic EL panel) The power supply unit is provided on two side surfaces. By supplying power to the power feeding portions of the first organic EL panel and the second organic EL panel, the first organic EL panel and the second organic EL panel can emit light independently of each other.
Moreover, according to the structure of this invention, since the electric power feeding part is formed in the side surface of a board | substrate, it can utilize the characteristic of the organic EL module that it does not become thick in the overlapping direction, but is thin.
Furthermore, according to the structure of this invention, when the board | substrate is planarly viewed, the electric power feeding part of the said 2 organic electroluminescent panel is located in 3 sides. That is, since each power feeding part is distributed on each side and the end face of each substrate can be used sufficiently as a contact point, a sufficient ground area for power feeding can be secured. Moreover, since it distributes to each edge | side, compared with the case where electric power is supplied collectively from one side like patent document 1, a brightness nonuniformity can be suppressed.

  The invention according to claim 2 is the organic EL module according to claim 1, wherein the power feeding portion is formed by a vapor deposition method or a metal plating method.

  According to the structure of this invention, since it forms by the vapor deposition method or the metal plating method, it is easy to form an electric power feeding part.

  3. The organic EL module according to claim 1, wherein one of the two organic EL panels has a feeding portion formed on two opposite sides when the substrate is viewed in plan view. The other organic EL panel preferably has a power feeding portion formed on two sides different from the two sides.

  According to a fourth aspect of the present invention, one of the feeding parts formed on the two opposing sides is an anode feeding part that bears the anode of the organic EL panel, and the other is a cathode feeding part that bears the cathode of the organic EL panel. It is an organic EL module according to claim 3.

  According to the configuration of the present invention, since the anode power feeding part and the cathode power feeding part are formed on two opposing sides, it is easy to spread the current to the whole and suppress the occurrence of uneven brightness.

  The invention according to claim 5 is characterized in that the substrate has a quadrangular shape, and when the substrate is viewed in plan, power supply portions are located on all four sides. It is an organic EL module of description.

  According to the structure of this invention, since a board | substrate is a rectangle, it is easy to adapt to space. Moreover, since the power supply unit is provided on all four sides, the area of the power supply unit can be increased, and power can be stably supplied from the outside.

  The invention according to claim 6 is the organic EL module according to any one of claims 1 to 5, wherein the two organic EL panels have the same structure.

  According to the configuration of the present invention, since one type of organic EL panel is formed by being overlapped, the manufacturing cost can be reduced.

  The invention according to claim 7 has a soaking sheet, and the soaking sheet is interposed between the two organic EL panels. It is an organic EL module of description.

  According to the configuration of the present invention, since the soaking sheet is interposed between the organic EL panel and the organic EL panel, it is possible to make the temperature distribution in the surface of each organic EL panel uniform, and uneven brightness. Can be suppressed.

  According to the organic EL module of the present invention, both sides can emit light, and power can be supplied to each organic EL panel independently.

1 is a perspective view conceptually showing an organic EL module according to a first embodiment of the present invention. It is a disassembled perspective view of the organic EL module of FIG. It is the disassembled perspective view which looked at the organic electroluminescent panel of FIG. 2 from another direction. It is a perspective view showing the insulating substrate and organic EL element of the organic EL panel of FIG. It is AA sectional drawing of the organic EL module of FIG. It is BB sectional drawing of the organic EL module of FIG. It is a top view explaining each area | region of the organic EL module of FIG. It is explanatory drawing showing the flow of an electric current at the time of connecting an external power supply to the organic EL module of FIG. 1, and an electric current is represented by the arrow. It is explanatory drawing showing the flow of the electric current in the auxiliary electrode layer of FIG. 8, and represents an electric current with the arrow. It is a disassembled perspective view of the organic EL module which concerns on other embodiment. It is a disassembled perspective view of the organic electroluminescent module which concerns on other embodiment.

  The present invention mainly relates to an organic EL module used as a lighting device. FIG. 1 shows an organic EL module 1 according to the first embodiment of the present invention. Hereinafter, the positional relationship between the top, bottom, left, and right will be described based on the posture of FIG. 1 unless otherwise specified. In addition, the drawings are drawn extremely as a whole as compared with actual sizes (length, width, thickness) for easy understanding.

  As shown in FIGS. 1 and 5, the organic EL module 1 according to the present embodiment combines and integrates two organic EL panels 2 and 3 of the same type, and extracts light in directions away from each other (reverse direction). Is. That is, the two organic EL panels 2 and 3 constituting the organic EL module 1 are both bottom emission type organic EL panels and use the same structure, and the organic EL module 1 is a double-sided organic EL panel. It is an EL module.

  In the organic EL module 1, a soaking sheet 11 is interposed between two organic EL panels 2 and 3 as shown in FIG. 2 and bonded by a hard adhesive resin 19 as shown in FIG. 5. The organic EL module 1 has electrode fittings 5 and 6 connected to the organic EL panels 2 and 3 as shown in FIGS. 1 and 2, and these electrode fittings 5 and 6 as shown in FIGS. Is also interposed between the organic EL panels 2 and 3.

  The organic EL module 1 of the present embodiment can supply power to the organic EL panels 2 and 3 independently, and can switch on / off the organic EL panels 2 and 3 independently. Yes.

  Hereinafter, the configuration of each part of the organic EL module 1 will be described. Since the organic EL panels 2 and 3 of the present embodiment have the same structure as described above, the drawings mainly depict the organic EL panel 2, but the same applies to the organic EL panel 3.

  In the organic EL panels 2 and 3, the first electrode layer 13, the functional layer 15, and the second electrode layer 16 are laminated in this order on one surface (main surface) of the insulating substrate 12 (substrate) as shown in FIGS. The stacked organic EL elements 20 are stacked. Further, in the organic EL panels 2 and 3, an inorganic sealing layer 17 is laminated from above the organic EL element 20, and most of the organic EL element 20 is sealed.

Further, in the organic EL panels 2 and 3, when the insulating substrate 12 is viewed in plan, side electrode layers 21 and 22 (feeding portions) are formed along two side surfaces forming two opposite sides as shown in FIG. Has been. Specifically, the side electrode layers 21a and 22a of the organic EL panel 2 are formed on two sides facing the width direction w, and the side electrode layers 21b and 22b of the organic EL panel 3 are the remaining two sides, That is, it is formed on two sides facing the length direction 1 (a direction perpendicular to the width direction w and also perpendicular to the thickness direction).
As shown in FIGS. 5 and 6, the side electrode layer 21 is formed across the end surfaces of the insulating substrate 12, the first electrode layer 13, and the second electrode layer 16. The side electrode layer 22 is formed across the end surfaces of the insulating substrate 12, the first electrode layer 13, and the inorganic sealing layer 17.

As shown in FIG. 7, the organic EL panels 2 and 3 have a light emitting region 25 that emits light when driven (lighted) and a non-light emitting region 26 that does not emit light when the insulating substrate 12 is viewed in plan.
The light emitting region 25 is a region where the overlapping portion of the first electrode layer 13, the functional layer 15, and the second electrode layer 16 is located as shown in FIGS. 5 and 6.
The non-light emitting region 26 is a frame-like region formed so as to surround the light emitting region 25 as shown in FIG. 7, and is electrically connected to the first electrode layer 13 in the light emitting region 25 as shown in FIGS. 5 and 6. The first power supply region 27 is electrically connected, and the second power supply region 28 is electrically connected to the second electrode layer 16 in the light emitting region 25.
As shown in FIG. 7, the first power supply region 27 is a region having a “U” shape when the insulating substrate 12 is viewed in plan. The second power supply region 28 is a region that is linear when the insulating substrate 12 is viewed in plan. The first power supply region 27 and the second power supply region 28 are continuous in the circumferential direction with the light emitting region 25 as the center.

Further, as shown in FIG. 3, the organic EL panels 2 and 3 include an electrode pad separation groove 30 in which the first electrode layer 13 is partially removed and an auxiliary electrode separation groove 31 in which the second electrode layer 16 is partially removed. Have.
The electrode pad separation groove 30 is a groove located at the boundary between the light emitting region 25 and the second power feeding region 28 as shown in FIGS. The electrode pad separation groove 30 is a groove that separates the first electrode layer 13 into two regions and forms the electrode pad portion 32 in the second power feeding region 28.
As shown in FIG. 3, the electrode pad separation groove 30 is formed so as to be parallel to the side where the side electrode layer 22 located in the second power feeding region 28 is provided. Specifically, the organic EL panel 2 is formed in parallel with the vertical side extending in the vertical direction l, and the organic EL panel 3 is formed in parallel with the horizontal side extending in the horizontal direction w.

As shown in FIGS. 5 and 6, the auxiliary electrode separation groove 31 is located at the boundary between the light emitting region 25 and the first power feeding region 27, separates the second electrode layer 16, and places the auxiliary electrode layer 33 in the second power feeding region 28. It is a groove to be formed. The auxiliary electrode separation groove 31 is a groove extending in a “U” shape when the insulating substrate 12 is viewed in a plan view as shown in FIGS. 3 and 4. That is, the auxiliary electrode separation groove 31 intersects (orthogonally) the first separation portion 35 parallel to the side where the side electrode layer 21 located in the first power supply region 27 is provided, and the first separation portion 35. The second separator 36 and the third separator 37 are formed.
In the organic EL panel 2, the first separation unit 35 is formed in parallel to the vertical side extending in the vertical direction, and the second separation unit 36 and the third separation unit 37 are parallel to the horizontal side orthogonal to the vertical side. Is formed.
In the organic EL panel 3, the first separation unit 35 is formed in parallel to a lateral side extending in a lateral direction that is orthogonal to the first separation unit 35 of the organic EL panel 2. In the organic EL panel 3, the 3 separation part 37 is formed in parallel with the vertical side.
In other words, the auxiliary electrode layer 33 is separated from the second electrode layer 16 in the light emitting region 25 by the auxiliary electrode separation groove 31, and when the insulating substrate 12 is viewed in plan view, as shown in FIGS. "".

  When attention is paid to the positional relationship between the electrode pad separation groove 30 and the auxiliary electrode separation groove 31, the electrode pad separation groove 30 and the auxiliary electrode separation groove 31 are formed in the organic EL element 20 in the light emitting region 25 as shown in FIGS. 5 and 6. Is formed so as to surround. The electrode pad separation groove 30 and the first separation part 35 are parallel to each other as shown in FIG. 4, and the electrode pad separation groove 30, the second separation part 36, and the third separation part 37 are orthogonal to each other.

When attention is paid to the cross-sectional structure of the organic EL panels 2 and 3, the insulating substrate 12 that functions as a support substrate for the organic EL panels 2 and 3 is a substrate having translucency and insulating properties, specifically, soda lime. A glass substrate such as glass or non-alkali glass can be employed.
The insulating substrate 12 has a polygonal shape, and among them, a rectangular shape is preferable. In this embodiment, a square glass substrate is employed.

The first electrode layer 13 located on the insulating substrate 12 is an electrode layer that forms one electrode in the light emitting region 25. In the present embodiment, the first electrode layer 13 functions as an anode in the light emitting region 25. .
The material of the first electrode layer 13 is not particularly limited as long as it has translucency and conductivity. For example, indium tin oxide (ITO), indium zinc oxide (IZO), oxidation Transparent conductive oxides such as tin (SnO ₂ ) and zinc oxide (ZnO) are employed.
ITO or IZO, which has high transparency, is particularly preferable in that light generated from the light emitting layer in the functional layer 15 can be effectively extracted. In this embodiment, ITO is adopted.
The first electrode layer 13 is preferably formed by a CVD method or a sputtering method.

  The functional layer 15 located on the first electrode layer 13 is a layer provided between the first electrode layer 13 and the second electrode layer 16 and having at least one light emitting layer. The functional layer 15 is composed of a plurality of layers mainly made of an organic compound.

The second electrode layer 16 located on the functional layer 15 is an electrode layer that forms another electrode with the first electrode layer 13 in the light emitting region 25. In the present embodiment, the second electrode layer 16 is formed in the light emitting region 25. It functions as a cathode.
The material of the second electrode layer 16 is not particularly limited as long as it has conductivity, and examples thereof include metals such as silver (Ag) and aluminum (Al).
The second electrode layer 16 of the present embodiment is made of Al, and is formed by a sputtering method or a vacuum evaporation method.

The inorganic sealing layer 17 located on the second electrode layer 16 is a layer that seals the organic EL element 20 in the light emitting region 25 and has gas non-permeability.
The inorganic sealing layer 17 is not particularly limited as long as it has gas impermeability, and a known substance can be used. For example, metal oxide (MO), metal nitride (MN), metal carbide (MC), etc. can be employed. M represents a metal. Silicon nitride and silicon oxide made of Si—N, Si—H, N—H, or the like, and silicon oxynitride that is an intermediate solid solution of both are preferable.

The auxiliary electrode layer 33 located in the first power feeding region 27 is a layer that assists electrical conduction in the first electrode layer 13 and has higher electrical conductivity (conductivity) than the first electrode layer 13. .
In the present embodiment, the second electrode layer 16 is formed separately, and is formed of the same material as the second electrode layer 16.

The side electrode layers 21 and 22 (power feeding portions) formed on the side surface of the insulating substrate 12 are portions that are connected to the electrode fittings 5 and 6 and fed with power from an external power source.
The side electrode layers 21 and 22 are not particularly limited as long as they have conductivity. For example, gold (Au), silver (Ag), copper (Cu), zinc (Zn), chromium (Cr ), Nickel (Ni), tin (Sn), and aluminum (Al), or a metal or alloy containing at least one metal selected from the group consisting of aluminum (Al).
The side electrode layers 21 and 22 are preferably formed by vacuum deposition or metal plating.
The “metal plating method” here includes an electroless plating method and an electrolytic plating method.

Here, the positional relationship of each layer of the organic EL panel 2 will be described. Since the organic EL panel 3 is the same except that the vertical and horizontal directions are reversed, the description thereof is omitted.
In the organic EL panel 2, side electrode layers 21 and 22 are formed on two opposing side surfaces of the insulating substrate 12 as shown in FIG. The first electrode layer 13 laminated on the insulating substrate 12 covers most of the insulating substrate 12 except for the electrode pad separation groove 30 as shown in FIG.
Specifically, both end portions in the lateral direction w of the first electrode layer 13 reach each end portion of the insulating substrate 12, but both end portions in the longitudinal direction 1 of the first electrode layer 13 correspond to each end of the insulating substrate 12. The inorganic sealing layer 17 covers both end faces of the first electrode layer 13 without reaching the end.

The functional layer 15 laminated on the first electrode layer 13 is formed across the light emitting region 25 and the second power feeding region 28 in the lateral direction as shown in FIG.
One end portion (end portion on the second power feeding region 28 side) of the functional layer 15 extends beyond the electrode pad separation groove 30 to a part of the electrode pad portion 32. That is, the functional layer 15 is filled in the electrode pad separation groove 30 and is in direct contact with the first electrode layer 13 via the electrode pad separation groove 30. Therefore, the first electrode layer 13 in the light emitting region 25 and the first electrode layer 13 (electrode pad portion 32) in the second power feeding region 28 are cut off by the functional layer 15 in the surface direction.
On the other hand, the other end of the functional layer 15 (the end on the first power supply region 27 side) is within the light emitting region 25 and does not protrude to the first power supply region 27. That is, the auxiliary electrode separation groove 31 is located inside the first separation portion 35.
The functional layer 15 is accommodated in the light emitting region 25 as shown in FIG. 6 in the vertical direction, and does not protrude from the first power feeding region 27 on both sides. That is, the functional layer 15 is located inside the second separation portion 36 and the third separation portion 37 of the auxiliary electrode separation groove 31 (center side of the insulating substrate 12) in the vertical direction.

The second electrode layer 16 laminated on the functional layer 15 is formed across the regions on both sides of the first feeding region 27 and the second feeding region 28 from the light emitting region 25 in the lateral direction as shown in FIG. Yes.
One end of the second electrode layer 16 (the end on the second power feeding region 28 side) covers the outer side beyond the end of the functional layer 15 in the lateral direction, and the second electrode layer 16 in the second power feeding region 28 A part of one electrode layer 13 (electrode pad portion 32) is covered. That is, the second electrode layer 16 and the electrode pad portion 32 are physically connected.
On the other hand, the other end of the second electrode layer 16 (the end on the first power supply region 27 side) protrudes beyond the end of the functional layer 15 and passes through the first separation portion 35 of the auxiliary electrode separation groove 31. Furthermore, it reaches the end of the first electrode layer 13.

  Both end portions of the second electrode layer 16 protrude beyond the both end portions of the functional layer 15 in the vertical direction as shown in FIG. 6, and the second separation portion 36 or the third separation portion 37 of the auxiliary electrode separation groove 31 is formed. Further, both end portions of the first electrode layer 13 are reached. However, both end portions of the second electrode layer 16 do not reach both end portions of the insulating substrate 12 but are accommodated on the first electrode layer 13.

The inorganic sealing layer 17 laminated on the second electrode layer 16 is formed in the lateral direction so as to extend from the light emitting region 25 to regions on both sides of the first feeding region 27 and the second feeding region 28 as shown in FIG. Has been.
One end of the inorganic sealing layer 17 (the end on the second power supply region 28 side) extends laterally beyond the projection surface in the member thickness direction of the electrode pad separation groove 30 as shown in FIG. It extends to the outside of the second electrode layer 16. However, the inorganic sealing layer 17 does not cover the end of the electrode pad portion 32. That is, when viewed from the electrode pad portion 32 side, the end portion of the electrode pad portion 32 forms a second exposed portion 41 exposed from the inorganic sealing layer 17.
On the other hand, the other end portion (the end portion on the first power feeding region 27 side) of the inorganic sealing layer 17 extends outward beyond the projection surface in the member thickness direction of the first separation portion 35 of the auxiliary electrode separation groove 31. Exist. That is, the first separation part 35 inside the auxiliary electrode separation groove 31 is filled with the inorganic sealing layer 17, and the first electrode layer 13 passes through the first separation part 35 of the auxiliary electrode separation groove 31. And the inorganic sealing layer 17 are in direct contact. Therefore, the auxiliary electrode layer 33 and the other second electrode layer 16 are cut off in the lateral direction.
However, the inorganic sealing layer 17 does not cover the end of the auxiliary electrode layer 33. That is, when viewed from the auxiliary electrode layer 33 side, the end portion of the auxiliary electrode layer 33 forms the first exposed portion 40 exposed from the inorganic sealing layer 17.

In the longitudinal direction, the inorganic sealing layer 17 extends outward beyond the projection surface in the member thickness direction of the second separation portion 36 and the third separation portion 37 of the auxiliary electrode separation groove 31 as shown in FIG. Furthermore, it extends to both ends of the insulating substrate 12 beyond both outer sides of the auxiliary electrode layer 33. That is, the inside of the second separation portion 36 and the third separation portion 37 of the auxiliary electrode separation groove 31 is filled with the inorganic sealing layer 17, and the second separation portion 36 and the third separation portion of the auxiliary electrode separation groove 31 are filled. The first electrode layer 13 and the inorganic sealing layer 17 are in direct contact with each other through the portion 37. That is, the auxiliary electrode layer 33 and the other second electrode layer 16 are cut off in the vertical direction.
Thus, the inorganic sealing layer 17 completely covers the organic EL element 20 in the light emitting region 25.

  The side electrode layer 21 located in the first power feeding region 27 is formed so as to cover the respective interfaces of the insulating substrate 12, the first electrode layer 13, and the auxiliary electrode layer 33 in the lateral direction as shown in FIG. Further, the first exposed portion 40 is covered on the auxiliary electrode layer 33. On the other hand, the side electrode layer 22 located in the second power feeding region 28 and facing the side electrode layer 21 is formed so as to cover the interface between the insulating substrate 12 and the electrode pad portion 32, and further on the electrode pad portion 32. 2 The exposed portion 41 is covered.

Turning to the soft adhesive resin 18, the soft adhesive resin 18 is an adhesive layer that has adhesiveness and flexibility, and is plastically deformed or elastically deformed according to predetermined conditions during bonding (solidification). In the present embodiment, when the soft adhesive resin 18 receives a compressive stress of the inorganic sealing layer 17 or the like, the soft adhesive resin 18 can be plastically deformed with almost no resistance to the stress.
The shore hardness of the soft adhesive resin 18 according to JIS K 6253 has a Shore hardness of A30 or more and A70 or less, preferably A40 or more and A65 or less, and more preferably A45 or more and A63 or less.
When the shore hardness of the soft adhesive resin 18 is greater than A70, the rigidity of the soft adhesive resin 18 is too large to sufficiently absorb swelling and impact. Further, when, for example, a sheet having low rigidity is adopted as the soaking sheet 11, if the shore hardness of the soft adhesive resin 18 is smaller than A30, the rigidity of the soft adhesive resin 18 is too small and the shape of the soaking sheet 11 is reduced. Cannot be maintained.
The flexural modulus of the soft adhesive resin 18 is preferably 3 MPa or more and 30 MPa or less, more preferably 3 MPa or more and 25 MPa or less, and particularly preferably 3.9 MPa or more and 23 MPa or less.

  Specific materials for the soft adhesive resin 18 include acrylic rubber (ACM), ethylene propylene rubber (EPM, EPDM), silicone rubber (Q), butyl rubber (IIR), styrene-butadiene rubber (SBR), and butadiene rubber (BR). ), Fluoro rubber (FKM), nitrile rubber (NBR), isoprene rubber (IR), urethane rubber (U), chlorosulfonated polyethylene (CSM), epichlorohydrin rubber (CO, ECO), chloroprene rubber (CR), etc. One or more materials selected from acrylic rubber-based resins, ethylene-propylene rubber-based resins, silicone rubber-based resins, and butyl rubber-based resins can be used, although they have a certain water vapor barrier property and are available at low cost. In particular, it is easy to obtain as a film. Rubber-based resin is more preferable.

Moreover, the soft adhesive resin 18 of this embodiment is a sheet-like or plate-like member, and the surface is subjected to adhesive processing.
The average thickness of the soft adhesive resin 18 is preferably 2 μm or more and 100 μm or less, and more preferably 5 μm or more and 50 μm or less.
When the average thickness of the soft adhesive resin 18 is thinner than 2 μm, the swelling and impact of the inorganic sealing layer 17 cannot be sufficiently absorbed. If the thickness is greater than 100 μm, heat may not be transmitted to the soaking sheet 11, and heat may be accumulated in the soft adhesive resin 18.

The hard adhesive resin 19 is a harder material having higher rigidity than the soft adhesive resin 18. Specifically, the shore hardness (and the approximate value of the corresponding flexural modulus) of the hard adhesive resin 19 according to JIS K 6253 is preferably Shore A 80 or higher, that is, Shore D 30 or higher (25 MPa or higher). From the viewpoint of providing a highly reliable organic EL device, Shore D55 or more (250 MPa or more), Shore D95 or less (6000 MPa or less) is more preferable, Shore D80 or more (1500 MPa or more), Shore D90 or less (4000 MPa or less). More preferably.
Moreover, the hard adhesive resin 19 of this embodiment has waterproofness and adhesiveness, and a plurality of members can be bonded to each other. Specifically, the hard adhesive resin 19 of the present embodiment is formed by solidifying a solution or gel fluid.
As a specific material of the hard adhesive resin 19, a thermosetting resin can be adopted. In the present embodiment, an epoxy resin is adopted among the thermosetting resins.

  The soaking sheet 11 is a sheet-like member having a soaking function as shown in FIG. The material of the soaking sheet 11 is not particularly limited as long as it has a high thermal conductivity. For example, aluminum, copper, stainless steel, iron, titanium, 42 alloy, graphite, or the like can be adopted. Among these, when aluminum is used as the material of the soaking sheet 11, it is preferable from the viewpoint of sealing performance to use rolled aluminum as the soaking sheet 11.

The electrode fittings 5 and 6 are members that can be connected to an external power source, and are foil-like or plate-like members having conductivity as shown in FIG.
The material of the electrode fittings 5 and 6 is not particularly limited as long as it has conductivity, but from the viewpoint of low resistivity, a metal material such as gold, silver, copper, nickel, chromium, aluminum, etc. Is preferred.
The electrode fittings 5 and 6 can also function as plating electrodes when the side electrode layers 21 and 22 are formed by electrolytic plating. In other words, the electrode fittings 5 and 6 are placed in the organic EL panels 2 and 3 before the side electrode layers 21 and 22 are formed, and are immersed in a plating tank, and a voltage is applied to the electrode fittings 5 and 6 to thereby form the side electrode layers. Each of 21 and 22 can be formed.

  Then, the positional relationship of each site | part of the organic EL module 1 is demonstrated. Since the organic EL panels 2 and 3 have the same structure, one organic EL panel 2 is referred to as a first organic EL panel 2 and the other organic EL panel 3 is referred to as a second organic EL for clear distinction. This is called panel 3. Moreover, in order to distinguish also in each site | part of the 1st organic EL panel 2 and the 2nd organic EL panel 3, in order to distinguish, the site | part of the 1st organic EL panel 2 attaches a to a number, The part is described by adding b to the number.

  As described above, the organic EL module 1 includes the first organic EL panel 2 and the second organic EL panel 3 on the surfaces of the insulating substrates 12a and 12b (surface on which the organic EL element 20 is laminated) as shown in FIG. They are overlaid so that they face each other. Further, the soaking sheet 11 is interposed between the organic EL element 20 a of the first organic EL panel 2 and the organic EL element 20 b of the second organic EL panel 3. That is, when the soaking sheet 11 is used as a reference, the organic EL elements 20a and 20b are located outside the soaking sheet 11, and the insulating substrates 12a and 12b are located further outside.

When attention is paid to the adhesion portion of the soft adhesive resin 18 to the first organic EL panel 2, the soft adhesive resin 18 covers at least the entire organic EL element 20a in the light emitting region 25 of the organic EL panel 2 as shown in FIG. .
In the present embodiment, in the lateral direction, as shown in FIG. 5, one end portion (the end portion on the first power feeding region 27 side) of the soft adhesive resin 18 is the member thickness of the first separation portion 35 of the auxiliary electrode separation groove 31. It reaches to the projection plane of the direction. The other end of the soft adhesive resin 18 (the end on the second power feeding region 28 side) reaches the projection surface of the inorganic sealing layer 17 in the member thickness direction. In the vertical direction, as shown in FIG. 6, both end portions of the soft adhesive resin 18 reach the projection surface in the member thickness direction of the first separation portion 35 of the auxiliary electrode separation groove 31.

When attention is paid to the adhesion portion of the hard adhesive resin 19 to the first organic EL panel 2, the hard adhesive resin 19 is formed in an annular shape so as to surround the soft adhesive resin 18 as shown in FIGS. The portion covers the vicinity of the edge of the soft adhesive resin 18.
The hard adhesive resin 19 covers at least the side electrode layers 21 and 22 as shown in FIG. 5 in the lateral direction. In this embodiment, the hard adhesive resin 19 covers the boundary portion between the side electrode layers 21 and 22 and the inorganic sealing layer 17. Yes. The hard adhesive resin 19 covers at least the projection surface in the thickness direction of the auxiliary electrode layer 33 as shown in FIG.

  When attention is paid to the installation site of the soaking sheet 11 on the first organic EL panel 2, the soaking sheet 11 covers at least the organic EL element 20 in the light emitting region 25 as shown in FIGS. In the form, the entire soft adhesive resin 18 is further covered. However, it does not reach the inside of the hard adhesive resin 19 and is not in contact with the electrode fittings 5 and 6.

When attention is paid to the installation site of the electrode fittings 5 and 6 on the first organic EL panel 2, the base ends of the electrode fittings 5 and 6 (ends on the first organic EL panel 2 side) are the first feeding region 27 and the first 2 The electrode fittings 5 and 6 are respectively located on the hard adhesive resin 19 located in the power feeding region 28, and the side electrode layers 21 through the side surfaces of the hard adhesive resin 19 from the base end portion toward the tip end portion. , 22 are covered. That is, the vicinity of the base end portion of the electrode fittings 5 and 6 is buried in the hard adhesive resin 19.
In addition, the electrode fittings 5 and 6 are arranged with a predetermined distance from the soaking sheet 11.

  About the adhesion part and installation position of the soft adhesive resin 18, the hard adhesive resin 19, the soaking sheet 11, and the electrode fittings 5 and 6 to the second organic EL panel 3, there is a vertical and horizontal relationship with the case of the first organic EL panel 2. Since it is the same except for having been replaced, the description is omitted.

Then, paying attention to the positional relationship between the first organic EL panel 2 and the second organic EL panel 3, the second organic EL panel 3 has the first organic EL panel 2 and the top and bottom reversed. Further, the second organic EL panel 3 has a posture that is shifted by 90 degrees in the circumferential direction around the light emitting region 25 with respect to the first organic EL panel 2. That is, the side electrode layers 21 and 22 of the first organic EL panel 2 are not located on the projection surface in the thickness direction of the side electrode layers 21 and 22 of the second organic EL panel 3.
Similarly, the electrode fittings 5a, 6a of the first organic EL panel 2 and the electrode fittings 5b, 6b of the second organic EL panel 3 do not overlap on the projection surface in the thickness direction, and the respective electrode fittings 5a, 6a, 5b. , 6b are formed on the four sides of the organic EL module 1, respectively.

  The electrode fittings 5a and 6a of the first organic EL panel 2 and the electrode fittings 5b and 6b of the second organic EL panel 3 extend in directions away from each other as shown in FIG. The light emitting region 25a of the first organic EL panel 2 is located on the projection plane in the overlapping direction of the light emitting region 25b of the second organic EL panel 3.

Next, a current flow when an external power source is connected to the organic EL module 1 will be described.
The organic EL module 1 shown in FIG. 8 has an anode terminal of an external power supply connected to the electrode fitting 5 and a cathode terminal of the external power supply connected to the electrode fitting 6.

First, when the first organic EL panel 2 is turned on, the flow of current in the first organic EL panel 2 will be described. The current supplied from the external power source to the electrode fitting 5a is as shown in FIG. , Transmitted to the side electrode layer 21a, and transmitted from the side electrode layer 21a to the auxiliary electrode layer 33a. The current reaching the auxiliary electrode layer 33a diffuses in the auxiliary electrode layer 33a and is transmitted from the entire auxiliary electrode layer 33a to the first electrode layer 13a located in the first power feeding region 27a.
The current transmitted to the first electrode layer 13a in the first power feeding region 27a diffuses in the first electrode layer 13a and is transmitted to the first electrode layer 13a in the light emitting region 25. The current transmitted to the first electrode layer 13a in the light emitting region 25a passes through the functional layer 15a and is transmitted to the second electrode layer 16a. At this time, a voltage is applied to the functional layer 15a, holes and electrons recombine, and the light emitting layer in the functional layer 15a emits light.
The current transmitted to the second electrode layer 16a in the light emitting region 25a is transmitted to the second electrode layer 16a in the second power feeding region 28a and reaches the electrode pad portion 32a. The current transmitted to the electrode pad portion 32a returns from the side electrode layer 22a to the external power supply via the electrode fitting 6a.
In this way, the first organic EL panel 2 is lit.

  When the second organic EL panel 3 is lit, the current flows as shown by a thick line in FIG. 8B, which is the same structure as the first organic EL panel 2, and when the first organic EL panel 2 is lit. Since this is the same as the current flow in FIG.

Here, since the 1st electrode layer 13 of this embodiment uses the transparent conductive oxide as mentioned above, internal resistance is high compared with a metal, and the organic EL element 20 whole in the light emission area | region 25 is included. The current cannot be evenly distributed to the first electrode layer 13, and there is a risk of uneven brightness.
Therefore, in the organic EL module 1, in the first power feeding region 27 of each organic EL panel 2, 3, as shown in FIG. Since the first electrode layer 13 in almost the entire first power feeding region 27 has the same potential because the current flows, it is possible to allow a current to flow evenly through the first electrode layer 13 in the light emitting region 25, and uneven luminance during driving. Can be suppressed.

  Since the organic EL panels 2 and 3 of the organic EL module 1 of the present embodiment use the organic EL panels having the same structure, the yield is good and the cost can be reduced.

  In the organic EL panels 2 and 3 of the organic EL module 1 of the present embodiment, each organic EL element 20 is primarily sealed by the inorganic sealing layer 17, and each organic EL element 20 is connected to the insulating substrate 12 a. It is located between the insulating substrates 12b and is secondarily sealed by sealing the space between the insulating substrates 12a and 12b with the hard adhesive resin 19. Therefore, sealing performance is high.

  In the embodiment described above, the independent electrode fittings 5 and 6 are provided for each of the first organic EL panel 2 and the second organic EL panel 3, but the present invention is not limited to this. As shown in FIG. 10, the common electrode fitting 50 may be used for one of the electrode fittings 5 and 6.

  In the embodiment described above, the electrode fittings 5 and 6 (side electrode layers 21 and 22) are provided along the sides facing each other. However, the present invention is not limited to this, and adjacent to each other as shown in FIG. You may provide along the side to do.

1 Organic EL Module 2 First Organic EL Panel (Organic EL Panel)
3 Second organic EL panel (organic EL panel)
11 Heat equalizing sheet 12 Insulating substrate (substrate)
13 First electrode layer 15 Functional layer (organic light emitting layer)
16 2nd electrode layer 21 Side electrode layer (feeding part, anode feeding part)
22 Side electrode layer (feeding part, cathode feeding part)

Claims (7)

A laminate having a first electrode layer, an organic light emitting layer, and a second electrode layer on the surface of a polygonal substrate, and having at least two bottom emission type organic EL panels that extract light from the substrate side An organic EL module,
In the organic EL module in which the two organic EL panels are stacked so that the surfaces of the substrates face each other,
The two organic EL panels have a power feeding part having a planar spread on at least two side surfaces of the substrate,
The organic EL module, wherein when the substrate is viewed in plan, the power feeding portions of the two organic EL panels are located on three sides.   The organic EL module according to claim 1, wherein the power supply unit is formed by a vapor deposition method or a metal plating method. Of the two organic EL panels, one of the organic EL panels has a power feeding portion formed on two opposite sides when the substrate is viewed in plan view.
3. The organic EL module according to claim 1, wherein the other organic EL panel has a power feeding portion formed on two sides different from the two sides. 4.   4. The power feeding part formed on the two opposing sides is an anode power feeding part that bears the anode of the organic EL panel, and the other is a cathode power feeding part that bears the cathode of the organic EL panel. The organic EL module described in 1. The substrate is square;
The organic EL module according to any one of claims 1 to 4, wherein when the substrate is viewed in plan, the power feeding unit is located on all four sides.   The organic EL module according to claim 1, wherein the two organic EL panels have the same structure. Have a soaking sheet,
The organic EL module according to claim 1, wherein the soaking sheet is interposed between the two organic EL panels.

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