JP2015185339A - organic EL planar light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high performance organic EL planar light source, capable of independently controlling light emission, respectively having a continuous inside light emitting region and a continuous outside light emitting region.SOLUTION: The organic EL planar light source includes an inside power feed part, surrounded by an insulating sealing layer, for feeding power to a second electrode layer of an inside organic EL element from an insulating sealing layer side of an opposite side of a light-emitting face in a boundary region of a boundary between outside and inside light-emitting regions. A first electrode layers of the outside and inside organic EL elements are continuous.

Description

  The present invention relates to an organic EL (Electro Luminescence) planar light source.

  In recent years, organic EL flat light sources 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 flat light source is formed by laminating an organic EL element on a substrate such as a glass transparent substrate, a transparent resin film, or a metal sheet, and forming a power feeding structure for feeding power to the organic EL element. .

  And an organic EL element makes two electrodes which one or both have translucency oppose, and laminated | stacked the light emitting layer which consists of an organic compound between this electrode. The organic EL flat light source emits light by the energy of recombination of electrically excited electrons and holes.

  That is, the organic EL flat light source is a self-luminous device, and can emit light of various wavelengths by appropriately selecting the material of the light emitting layer.

  In addition, the organic EL flat light source has a feature that it is extremely small and lightweight compared to incandescent lamps, fluorescent lamps, and LED lighting, and emits light in a planar shape, so that there are few restrictions on the installation location. . Furthermore, since the organic EL flat light source has higher luminous efficiency than incandescent lamps and fluorescent lamps, it has the features of low power consumption and low heat generation.

  By the way, conventionally, a lighting device having a disk shape using a fluorescent lamp and LED lighting has been used as a lighting device in a daily space such as a house or a conference room. Along with this, the design of everyday spaces such as homes and conference rooms is often designed according to the disk-type lighting device.

  For example, Japanese Patent Laid-Open No. 2004-228867 aims to reduce the thickness of a lighting device using an electroluminescent material, or to simplify the structure of the lighting device using an electroluminescent material and reduce the cost. A light-emitting element having a stacked structure of a first electrode layer, an EL layer, and a second electrode layer is provided over a light-transmitting substrate having an opening in the part, and a power supply for supplying power to the light-emitting element A disk-shaped organic EL lighting device is disclosed in which one connection portion and a second connection portion are provided at a central portion (in the vicinity of an opening provided in the light-transmitting substrate) on the light-transmitting substrate.

  Further, for example, Patent Document 2 is a surface light emitting panel including an organic EL light emitting element having a transparent electrode, and a light emitting area is formed in a ring shape on the light emitting surface and is along an inner peripheral edge of the light emitting area. An inner peripheral non-light-emitting region and an outer peripheral non-light-emitting region along the outer peripheral edge are formed, and at least one of the inner peripheral non-light-emitting region and the outer peripheral non-light-emitting region is electrically connected to the transparent electrode of the organic EL light-emitting element. A surface-emitting panel is disclosed in which a ring-shaped main wiring that is connected to each other and is capable of supplying power to an organic EL light-emitting element is provided.

  On the other hand, since the organic EL flat light source emits surface light as described above, the luminance varies depending on the density of current flowing in the organic EL element, and uneven light emission occurs. That is, when the light emitting area exceeds a predetermined size, the distribution of the voltage flowing in the surface becomes remarkable, and the current density may be distributed to cause obvious light emission unevenness. Therefore, in order to emit light evenly from the light emitting surface of the organic EL flat light source, it is desirable to make the current density distribution as uniform as possible.

JP 2010-245032 A JP 2014-032757 A

  Since the organic EL flat light source described in Patent Document 1 has a disk shape, it is easily adapted to a conventional existing space. Further, since the current flows uniformly from the outer peripheral side toward the center side, the current flows uniformly at any position in the circumferential direction, and the occurrence of uneven light emission in the circumferential direction can be reduced. However, in the radial direction of the circle, no measures are taken for the occurrence of uneven light emission, and when the emission area increases and the radius exceeds a predetermined size, the organic EL element is locally applied in the radial direction of the circle. There is a problem that excessive current is generated and uneven light emission occurs. Further, when the light emitting area is increased, heat is generated in the organic EL element, and there is a problem that the organic EL element is easily deteriorated by the generated heat.

  In this regard, in the organic EL flat light source described in FIGS. 2 and 3 of Patent Document 2, the inner electrode non-emitting region and the outer periphery non-emitting region of the annular light emitting region are supplied with power to the transparent electrode layer as the first electrode layer. By electrically connecting the main wiring, power is supplied to the transparent electrode layer mainly from the outer peripheral non-light-emitting region, so that the problem of excessive current in the radial direction of the circle hardly occurs, and such a problem of uneven light emission It is unlikely to occur.

  However, this Patent Document 2 does not describe a power feeding method to the counter electrode layer, which is the second electrode layer facing the transparent electrode layer, described in Patent Document 1. When wiring is attached to the second electrode layer for power supply, since the second electrode layer is formed on the first electrode layer through a functional layer including the organic material-containing light emitting layer, the organic material-containing light emitting layer It is generally difficult to attach the wiring without damaging it, and some kind of contrivance is required.

  Patent Document 2 discloses, as a method for creating an organic EL flat light source having a continuous light emitting region having a light emitting region capable of independently controlling light emission inside, for example, housing inside a large-diameter donut-shaped surface light emitting panel. FIG. 5 discloses that a small-diameter donut-shaped surface emitting panel is accommodated in the space and combined.

  However, this method of using two panels not only doubles the labor and cost of production, but also has problems such as complicated wiring and reduced design, and there is room for improvement. .

  Therefore, the present invention is an organic EL flat light source having a light emitting region that can be independently controlled for light emission as an inner light emitting region, and a continuous light emitting region as an outer light emitting region, and includes organic material-containing light emission. An object of the present invention is to provide an organic EL flat light source capable of attaching a power supply wiring to the second electrode layer without damaging the layer and capable of supplying power to the first electrode layer from the outer non-light-emitting region. .

The present invention for solving the above problems includes a first electrode layer, a functional layer including a light emitting layer containing an organic material, and a second electrode layer, each formed in order on the same light-transmitting substrate, And an organic EL planar light source including an organic EL element in an outer light emitting region and an organic EL element in an inner light emitting region that can independently control light emission,
In the organic EL flat light source in which the inner light emitting region and the outer light emitting region are continuous, and the inner light emitting region is surrounded by the outer light emitting region,
On the second electrode layer of the outer and inner organic EL elements, an insulating sealing layer covering them is provided,
Insulating sealing within the surface of the insulating sealing layer for supplying power from the insulating sealing layer side to the second electrode layer of the inner organic EL element in the boundary region of the boundary between the outer and inner light emitting regions An inner power supply having a conductive path surrounded by layers, and
The organic EL flat light source is characterized in that the first electrode layers of the outer and inner organic EL elements are continuous.

  According to the configuration of the present invention, even an organic EL flat light source having an inner light emitting region surrounded by an outer light emitting region can be independently controlled for light emission, and can be inexpensive and simple as a highly reliable flat light source. Can be manufactured. In addition, the light source of the present invention has a structure in which a power supply wiring can be attached to the second electrode layer without damaging the organic material-containing light emitting layer, and further, light emission from the outside is prevented so that uneven light emission does not occur. It is also a structure that can supply power to the first electrode layer from the non-light emitting region on the outer periphery of the region.

  Examples of the shape of the light-transmitting substrate, each light emitting region, and the organic EL element include a rectangle, a circular shape, and an elliptical shape. The light emitting region may be similar to the light transmitting substrate, but may not be similar. It doesn't matter. If a similar or similar light emitting region emits light on a circular or elliptical base material, fine adjustment of the in-plane rotation angle is unnecessary for existing structures, making it easy to install and familiarize with. Cheap.

  According to the configuration of the present invention, the light emitting region has at least an inner light emitting region located inside and an outer light emitting region located outside. That is, the organic EL flat light source of the present invention emits light by dividing the light emitting surface into a plurality of light emitting regions. Therefore, compared to an organic EL flat light source composed of one light emitting region as in Patent Document 1, the distribution of current values per unit area is less likely to occur. Further, it is possible to prevent heat from being accumulated locally.

  Moreover, according to the structure of this invention, an outer side light emission area | region is located so that the circumference | surroundings of an inner side light emission area may be enclosed. That is, when viewed from the inner light emitting region, the outer light emitting region forms a continuous or annular shape in the circumferential direction, the voltage distribution in the circumferential direction becomes uniform, and the current flows uniformly. For this reason, in the outer light emitting region, current density distribution in the circumferential direction is less likely to occur, and uneven light emission is less likely to occur.

  Furthermore, according to the structure of this invention, the inner side electric power feeding part which concerns on this invention exists in the boundary area | region of the boundary of an outer side and an inner side light emission area | region. This boundary region is preferably a non-light emitting region from the viewpoint of clarifying the distinction for each light emitting region. That is, it is preferable that the light-transmitting substrate has a non-light emitting region that does not emit light when all the lamps are viewed in plan, and the non-light emitting region is interposed between the inner light emitting region and the outer light emitting region. Further, in order to stably attach the power supply wiring to the second electrode layer, it is preferable that the inner power supply portion is also a non-light emitting region, as will be described later. Accordingly, an inner power feeding portion that is preferably a non-light-emitting region is provided in a boundary region that is preferably a non-light-emitting region. That is, according to the configuration of the present invention, by providing the inner power feeding portion, it is possible to suppress the occurrence of an unnatural non-light emitting region or a reduction in the area ratio of the light emitting region.

  Furthermore, according to the structure of this invention, the inner side organic EL element which is a laminated body located in an inner side light emission area | region is the outer side organic EL element which is a laminated body located in an outer side light emission area | region, and a 1st electrode layer continues. The so-called first electrode layer is a common electrode (common electrode). The first electrode layer is preferably an anode (anode), in which case it is a so-called anode common. The configuration of the present invention is the first electrode layer common as described above, but the second electrode layer is completely separated for each element, and light emission can be controlled independently. In addition, as described above, preferably, the non-light emitting region is interposed between the inner light emitting region and the outer light emitting region. By using the common first electrode layer as described above, as in Patent Document 2, Since it is not necessary to form a power feeding structure for the first electrode layer of each light emitting element in each of the non-light emitting areas of the inner light emitting area and the outer light emitting area, the light emission caused by providing such a power feeding structure separately. There is no hindrance.

  As described above, according to the organic EL flat light source of the present invention, an organic EL that has a light emitting area that can be independently controlled for light emission as an inner light emitting area and has a continuous light emitting area as an outer light emitting area. Even for a flat light source, wiring for power feeding can be attached to the second electrode layer without damaging the organic material-containing light emitting layer, and power can be fed to the first electrode layer from the peripheral non-light emitting region. Furthermore, uneven light emission is unlikely to occur in each light emitting region.

  Preferably, the light emission color of the organic EL element in the inner light-emitting region and the light emission color of the organic EL element in the outer light-emitting region are different from each other, and the organic EL flat light source having excellent design properties is obtained. Can do.

  Preferably, an organic EL flat light source having a plurality of organic EL elements serving as the inner light emitting region, or the inner light emitting region further includes an inner inner / outer region corresponding to the outer region and an inner inner region corresponding to the inner region. Or an organic EL flat light source including an inner region. Even in the method of Patent Document 2, a plurality of inner light emitting areas can be provided, or an inner light emitting area can be further provided in the inner light emitting area. In addition, the cost increases, the wiring becomes complicated, and it is considered difficult to prevent uneven light emission in the outer light emitting region. On the other hand, with the light source of the present invention, it is easy to make a plurality of inner light emitting areas or to provide an inner inner inner light emitting area on the inner side, and such a problem does not occur, and various designs are possible. Can be configured.

  In the case of the organic EL flat light source having a plurality of organic EL elements serving as the inner light emitting regions, the first electrode layer is fed within at least one of the boundary regions adjacent to each other of the plurality of inner light emitting regions. It is preferable to include an inner first electrode layer power feeding portion having a conductive path surrounded by the insulating sealing layer in the surface of the insulating sealing layer, and in the first electrode layer common electrode during power feeding Since variation in potential difference can be suppressed, light emission unevenness can be further reduced. Further, as described above, the boundary region is preferably a non-light-emitting region from the viewpoint of clarifying the distinction for each light-emitting region. By providing the electrode layer feeding portion, it is possible to suppress the occurrence of an unnatural non-light emitting region or a reduction in the area ratio of the light emitting region.

  Preferably, the internal power feeding portion is a first electrode layer island formed of the same material as the first electrode layer on the translucent substrate and is electrically separated from the first electrode layer. An electrical connection with the island, and the first electrode layer island is electrically connected with the second electrode layer by a second electrode layer connection groove formed of the same material as the second electrode layer. There is a more reliable organic EL flat light source having an inner light emitting region surrounded by a highly reliable outer light emitting region that can be manufactured by a simpler manufacturing method.

  According to the configuration of the present invention, an organic EL flat light source having an inner light emitting region surrounded by an outer light emitting region, which is formed on the same light-transmitting substrate, can independently control light emission, and each has an outer side. An organic EL illumination light source including a highly reliable organic EL element corresponding to the inner light emitting region can be provided.

It is explanatory drawing of each area | region of the light emission surface of the organic electroluminescent planar light source 1 in one embodiment of this invention, and has shown the dot in the site | part which light-emits at the time of all the lights. It is AA sectional drawing which turned down the light emission surface of the organic electroluminescent planar light source of FIG. 1 for the organic EL planar light source shown in FIG. 1, showing only the layer made of the material of the translucent substrate 2 and the first electrode layer 3 formed thereon, as viewed from the organic EL element side. FIG. It is explanatory drawing of each area | region at the time of seeing the organic electroluminescent planar light source of FIG. 1 from the surface on the opposite side to a light emission surface. FIG. 4 is a plan view additionally showing only the formation position of the second electrode layer connection groove 51 in FIG. 3. FIG. 6 is a plan view additionally showing only the location where the second electrode layer separation groove 61 is formed in FIG. 5. FIG. 7 is a plan view additionally showing only the location where the power supply pad connection groove 71 is formed in FIG. 6. It is explanatory drawing of the manufacturing process of the organic electroluminescent planar light source of FIG. 1, and is a top view in the state after functional layer 5 film-forming. The first electrode layer island 4 is indicated by a broken line for reference. It is sectional drawing which turned down the light emission surface of the organic electroluminescent planar light source 100 in another one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

  The organic EL flat light source of the present invention is an organic EL flat light source used as a light source for the purpose of observing the light source itself, such as a display lamp, mainly. Is a planar light source having an inner light emitting region surrounded by a light source.

  The organic EL flat light source 1 according to one embodiment of the present invention is formed by laminating an organic EL element 10 (laminated body) on a light-transmitting substrate 2 as shown in FIGS. 1, 2, 3, and 4, and from above. The insulating sealing layer 7 is laminated and sealed. Furthermore, a metal first electrode layer power supply pad 11 for supplying power from the outside to the first electrode layer 3, which is an electrode layer common to each organic EL element 10, and each organic EL from above the insulating sealing layer 7. Metal second electrode layer power supply pads 12-1 to 12-5 for supplying power from the outside are formed on the second electrode layer 6, which is an individual electrode layer of the element 10, and the outer periphery of the light emitting region 23. In order to suppress the potential difference generated in the first electrode layer 3 at the time of power feeding, the first electrode layer auxiliary electrode 13 made of metal is formed over the entire circumference of the region 21 in the surrounding non-light emitting region 21 located at In order to supply power to the first electrode layer in at least one of the boundary regions adjacent to each other of the organic EL elements to be the plurality of inner light emitting regions 22-1, 22-2, 222-1, and 222-2. Of metal, surrounded by an insulating sealing layer Those comprising a first electrode layer feed unit 14.

  As shown in FIG. 2, the organic EL element 10 is formed by laminating a first electrode layer 3, functional layers 5-1 to 5-5, and a second electrode layer 6 in order from the translucent substrate 2 side. The organic EL flat light source of the present embodiment employs a so-called bottom emission method in which light is extracted from the light-transmitting substrate 2 side.

  FIG. 1 is an explanatory diagram of each region of the light emitting surface of an organic EL flat light source according to an embodiment of the present invention, in which dots are shown at sites that emit light when all lamps are used. The organic EL flat light source 1 of the present embodiment has an outer light emitting region 23 and an inner light emitting region 22 (22-1 and 22-2) that emit light when all the lamps are in the plane when the transparent substrate 2 is viewed in plan. ) And surrounding non-light emitting regions 21 around them. In this embodiment, further, the inner inner / outer region 223 that is the inner light emitting region 22-2 is assumed to correspond to the outer region, and the inner inner / inner region 222 is assumed to correspond to the inner region. It has inner inner and inner regions 222-1 and 222-2. Here, each light emitting region can be the same color, but from the viewpoint of improving the design, it is preferable that the respective light emitting regions have different colors. For example, the outer light emitting region 23 is white, the inner light emitting region 22-1 is blue, The inner light emitting area 22-2 may be yellow, the inner inner inner area 222-1 may be green, and the inner inner inner area 222-2 may be red.

  A thick line separating each light emitting region and other regions in FIG. 1 represents a boundary region 24, and the thickness can be 5 mm or less and 0.1 mm or more. When the organic EL flat light source of the present invention is manufactured through a laser processing step, the thickness can be 2 mm or less, more preferably 1 mm or less. In the present specification, in the drawings other than FIG. 1, due to the illustrated relationship, such a narrow boundary region is shown thicker than the actual, and the structure in the boundary region is displayed in more detail than the actual, or the relationship is repeatedly displayed. The structure which becomes is omitted.

  In this embodiment, the boundary region 24 is a non-light emitting region, and the non-light emitting region is a surrounding non-light emitting region 21 around the outer and outer light emitting region 23 as shown in FIG. A boundary region 24 and a boundary region 24 between the light emitting regions existing inside the continuous outer light emitting region 23 are included.

  FIG. 2 is a cross-sectional view taken along line AA with the light emitting surface of the organic EL flat light source of FIG. As shown in FIG. 2, each light-emitting region is obtained when the organic EL element 10, which is a stacked body of overlapping portions of the first electrode layer 3, the functional layer 5, and the second electrode layer 6, is viewed from the light transmitting substrate 2 side. In addition, the region corresponds to each element 10. When the light emitting regions are different from each other as described above, the functional layer 5-1 is a white organic EL unit that emits white light, and similarly, the functional layer 5-2 is a blue organic EL unit, a function. The layer 5-3 is a yellow organic EL unit, the functional layer 5-4 is a green organic EL unit, and the functional layer 5-5 is a red organic EL unit. In FIG. 2, a part of the planar element 10 corresponding to the yellow light emitting region 22-2 is omitted for the purpose of drawing.

  In the following description, unless otherwise specified, the vertical positional relationship of the organic EL flat light source 1 will be described with reference to the posture of FIG. In addition, the drawings are drawn extremely as a whole as compared with actual sizes (length, width, thickness) for easy understanding.

  When the first electrode layer power supply pad 11 supplies power to the organic EL element 10 corresponding to each light emitting region, the first electrode layer power supply pad 11 supplies power to the layer that is common to these elements and serves as an anode function from the outside. Electrode. In the present embodiment, the first electrode layer auxiliary electrode 13 is formed continuously with the first electrode layer power supply pad 11.

  Here, the first electrode layer 3 common to each organic EL element 10 will be described.

  FIG. 3 shows the organic EL flat light source of FIG. 1 in which only the layer made of the material of the translucent substrate 2 and the first electrode layer 3 formed thereon is seen from the organic EL element side. It is a top view in the middle stage of the manufacturing process of a light source.

  In the translucent substrate 2, a first electrode layer 3 common to the elements is formed on almost the entire surface, and a first electrode layer island 4 is partially formed. That is, the first electrode layer 3 is formed on the entire surface of the translucent substrate 2 except for the portion of the first electrode layer island 4, thereby functioning as an electrode layer common to each organic EL element 10. To do.

  The first electrode layer island 4 is surrounded by the first electrode layer separation groove 31 so as to be electrically insulated from the first electrode layer 3, and each light emitting region and each functional layer 5-1 to 5-5. Corresponding to −5, formed as a plurality of first electrode layer islands 4-1 to 4-5, preferably made of the same material as the first electrode layer, more preferably translucent. One or more methods selected from the group consisting of etching and laser scribing on a raw material substrate having a material layer to be first electrode layer 3 and first electrode layer island 4 continuously formed on the entire surface of substrate 2 More preferably, the first electrode layer separation groove 31 for separating the material layer is formed by laser scribing.

  Here, when each groove is formed by laser scribing, the groove width can be narrowed. The groove width is preferably 5 μm or more and 200 μm or less, preferably 10 μm or more and 100 μm or less, from the viewpoint of exhibiting characteristics corresponding to the function of each groove such as electrical insulation or electrical connection while expanding the light emitting region. More preferably, it is 20 μm or more and 50 μm or less.

  FIG. 4 is an explanatory diagram of each region when the organic EL flat light source of FIG. 1 is viewed from the surface opposite to the light emitting surface.

  The second electrode layer power supply pads 12-1 to 12-5 correspond to the light emitting regions, the functional layers 5-1 to 5-5, and the first electrode layer islands 4-1 to 4-5. When power is supplied to the organic EL element 10, it is an electrode for supplying power from the outside to the individual second electrode layers 6 of these elements, preferably the layer having a cathode function.

  Hereinafter, the laminated structure of the organic EL flat light source 1 will be described, and each layer configuration of the organic EL flat light source 1 will be described later.

  As described above, the inner light emitting region 22 and the outer light emitting region 23 are regions of the light emitting surface corresponding to each element when light emitted from the organic EL element 10 is extracted from the light emitting surface.

  As described above, the organic EL flat light source 1 has the insulating sealing layer 7 (sealing layer) laminated so as to cover the organic EL element 10, and a plurality of grooves having different depths as shown in FIG. It is divided into multiple parts.

  Specifically, the organic EL flat light source 1 is formed by removing a material layer that partially becomes the first electrode layer 3 as shown in FIG. 2 and filling it with a high resistance material, preferably the same material as the functional layer 5. The first electrode layer separation groove 31 and the layer to be the functional layer 5 are partially removed and filled with a conductive material, preferably the same material as the second electrode layer 6, so that the first electrode layer island 4 and the second layer The second electrode layer connection groove 51 that electrically connects the electrode layer 6, the layer that becomes the functional layer 5, and the layer that becomes the second electrode layer 6 are partially removed and filled with the material of the insulating sealing layer 7. The second electrode layer separation groove 61, the layer that becomes the functional layer 5, the layer that becomes the second electrode layer 6, and the insulating sealing layer 7 are partially removed, and the power supply pads 11 and 12, the first electrode layer auxiliary electrode 13 and a power supply pad connection groove 71 filled with a conductive material of the inner first electrode layer power supply section 14. It is separated into a plurality of sections I.

  Hereinafter, each groove will be described in detail.

  The first electrode layer separation groove 31 is a groove for separating a material layer to be the first electrode layer 3 laminated on the light-transmitting substrate 2 as shown in FIGS. The electrode layer islands 4-1 to 4-5 are separated and electrically insulated. In this groove, it is necessary to embed a high-resistance material for electrical insulation, and an insulating polymer coating material, for example, a so-called edge cover material can be applied and dried around the groove, From the viewpoint of simplifying the process, the same material as that of the functional layer 5 is embedded by simultaneously forming the functional layer 5 in the film forming step, and the same material as that of the functional layer 5 is transmitted through the bottom of the first electrode layer separation groove 31. It is preferable to make direct contact with the substrate 2.

  As shown in FIGS. 1 and 3, each of the first electrode layer separation grooves 31 is formed in the vicinity of the boundary region 24 of each light emitting region. Although it is drawn in FIG. 3 so as to be 4, it is preferable to form it in the boundary region 24. More preferably, it is formed in the boundary region 24 that is visually recognized as a line.

  As shown in FIGS. 2 and 5, the second electrode layer connection groove 51 removes the layer that becomes the functional layer 5 (including the thin metal layer 9) in the first electrode layer islands 4-1 to 4-5. The groove is a groove in which the surface of the material layer to be the first electrode layer 3 in the removed portion is exposed.

  FIG. 5 is a plan view additionally showing only the formation positions of the second electrode layer connection grooves 51 in FIG. 3, and the second electrode layer connection grooves 51-1 to 51-5 corresponding to the respective light emitting regions are indicated by thick lines. Show.

  As shown in FIG. 5, the second electrode layer connection grooves 51 exist corresponding to the first electrode layer islands 4-1 to 4-5 corresponding to the respective light emitting regions, and the second electrode layers corresponding to the respective light emitting regions. 6 and the first electrode layer islands 4-1 to 4-5 corresponding to the respective light emitting regions are preferably the same material as the second electrode layer 6 from the viewpoint of conductive material and process simplification. Can be embedded by simultaneously forming a film in the film forming process of the second electrode layer 6. That is, it is preferable that the same material as the second electrode layer 6 is in direct contact with the first electrode layer island at the bottom of the second electrode layer connection groove 51. The second electrode layer connection grooves 51-1 to 51-5 are configured so as not to short-circuit the first electrode layer 3 serving as a common electrode and the second electrode layer 6 corresponding to each light emitting region. As shown in FIG. 3, it is necessary to remain in the first electrode layer islands 4-1 to 4-5 in a plan view.

  As shown in FIGS. 2 and 6, the second electrode layer separation groove 61 removes at least the layer that becomes the second electrode layer 6 so as to be one boundary line of the boundary region 24 of each light emitting region, The second electrode layers 6-1 to 6-5 corresponding to the light emitting regions are separated and electrically insulated. In FIG. 2, the layer that becomes the functional layer 5 is also removed at the same time, and since the insulating material, preferably the material of the insulating sealing layer 7 is embedded in this groove, the manufacturing process is simplified, and From the viewpoint of improving the sealing performance, the layer that becomes the functional layer 5 is also removed at the same time, so that the surface of the material layer that becomes the first electrode layer 3 in the removed portion is exposed. Is preferred.

  FIG. 6 is a plan view in which only the formation positions of the second electrode layer separation grooves 61 are additionally shown in FIG. 5, and the second electrode layer separation grooves 61 serving as a boundary line on at least one side of the boundary region 24 of each light emitting region. Is indicated by a bold line.

  As shown in FIG. 6, the second electrode layer separation groove 61 is located on the opposite side of each of the second electrode layer connection grooves 51 in the first electrode layer islands 4-1 to 4-5 corresponding to the light emitting regions. Therefore, the second electrode layers 6-1 to 6-5 in each light emitting region need to be electrically connected to the first electrode layer islands 4-1 to 4-5. Since the first electrode layer islands 4-1 to 4-5 are non-light emitting regions, the area of the non-light emitting region in the vicinity of the first electrode layer islands 4-1 to 4-5 is reduced in each boundary region 24. It is preferable to cross each of the first electrode layer islands 4-1 to 4-5 from the viewpoint of making the line visible and making it inconspicuous. Further, in order to reliably separate the second electrode layers 6-1 to 6-5, so as to form grooves protruding from each other at intersections where the grooves intersecting each other communicate with each other, the so-called grid pattern may be formed. preferable.

  As shown in FIGS. 2 and 7, the power supply pad connection groove 71 partially removes the layer to be the functional layer 5 (including the thin film metal layer 9), the layer to be the second electrode layer 6, and the insulating sealing layer 7. In addition, the removed portion is a groove in which the surface of the material layer that becomes the first electrode layer 3 is exposed.

  FIG. 7 is a plan view in which only the formation location of the power supply pad connection groove 71 is additionally shown in FIG. 6, and the power supply pad connection groove 71 existing outside the boundary region 24 with the outer light emitting region 23 of the surrounding non-light emitting region 21. -1 and the first electrode layer islands 4-1 to 4-5 corresponding to the respective light emitting regions, the power supply pads existing between the second electrode layer connection grooves 51 and the second electrode layer separation grooves 61 Three types of power supply pad connection grooves 71, which are a connection groove 71-2 and a power supply pad connection groove 71-3 existing in at least one of the boundary regions 24 adjacent to each other of the plurality of inner light emitting regions 22, are indicated by bold lines. .

  As shown in FIG. 7, the power supply pad connection groove 71-1 is provided on the first electrode layer power supply pad 11 for supplying power from the outside to the first electrode layer 1 that is a common electrode of each light emitting region, and in the plane thereof. A groove for forming the first electrode layer auxiliary electrode 13 for preventing a voltage drop, and is filled with a conductive material, preferably a conductive paste or a mask vapor-deposited conductive material. Preferably, the first electrode layer auxiliary electrode 13 is formed in the same process as the first electrode layer power supply pad 11, more preferably by performing vapor deposition of a metal material at the same time.

  The power supply pad connection groove 71-2 is formed between the second electrode layer connection groove 51 and the second electrode layer separation groove 61 in the first electrode layer islands 4-1 to 4-5 corresponding to the light emitting regions. By interposing them, the first electrode layer islands 4-1 to 4-5 and the second electrode layer connection grooves are externally provided to the second electrode layers 6-1 to 6-5 for each light emitting region. It is a groove | channel for supplying electric power through 51-1 to 51-5, Comprising: As the 2nd electrode layer electric power feeding pads 12-1-5, it is filled with an electroconductive material, Preferably, an electroconductive paste or a mask vapor deposition electroconductive material. Preferably, the first second electrode layer power supply pad 12 is formed by the same process as that of the first electrode layer power supply pad 11, more preferably by simultaneously performing vapor deposition of a metal material.

  As shown in FIG. 7, the power supply pad connection groove 71-3 exists in at least one of the boundary regions 24 adjacent to each other of the plurality of inner light emitting regions 22, and is a common electrode of each light emitting region. A groove for forming an inner first electrode layer feeding portion 14 for preventing a voltage drop in the plane of the first electrode layer 1, which is made of a conductive material, preferably a conductive paste or a mask vapor deposition conductive material. Buried. Preferably, the inner first electrode layer power supply unit 14 is formed in the same process as the first electrode layer power supply pad 11, more preferably, by simultaneously vapor-depositing a metal material with a mask.

  Then, each layer structure of the organic electroluminescent planar light source 1 is demonstrated.

  The translucent substrate 2 has translucency and insulation. The material of the translucent substrate 2 is not particularly limited, and is suitably selected from, for example, a flexible film translucent substrate or a plastic translucent substrate. In particular, a glass light-transmitting substrate and a transparent film light-transmitting substrate are preferable in terms of transparency and workability.

  The translucent substrate 2 has a polygonal shape, a circular shape, or an elliptical shape, and is preferably circular. In the present embodiment, a rectangular glass transparent substrate is employed.

The material of the first electrode layer 3 is not particularly limited as long as it is transparent and has 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. In this embodiment, ITO is adopted.

  The functional layer 5 is a layer provided between the first electrode layer 3 and the second electrode layer 6 and having at least one light emitting layer. The functional layer 5 is composed of a plurality of layers mainly made of organic compounds. The functional layer 5 can be formed of a known material such as a low molecular dye material or a conjugated polymer material used in a general organic EL flat light source. In addition, the functional layer 5 may have a multilayer structure including a plurality of layers such as a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.

  The functional layer 5 is the layer farthest from the translucent substrate 2 and can include a thin film metal layer 9 as a layer in contact with the insulating sealing layer 7. After forming the layer that becomes the thin metal layer 9 continuously, the second electrode layer connection groove 51 is formed in the layer that becomes the functional layer 5, so that the metal material becomes an organic material that is the main component of the functional layer 5. In comparison, since deterioration due to the presence of moisture and moisture permeation are small, it is possible to form the second electrode layer connection groove 51 while preventing moisture from entering the organic EL element 10 to some extent. That is, it is preferable because the step of forming the second electrode layer connection groove 51 can be performed by taking out from a vacuum atmosphere or an inert atmosphere. Of course, it is possible to handle the work in a vacuum atmosphere or an inert atmosphere as much as possible, including the step of forming the second electrode layer connection groove 51 and the formation of the power supply pads 11, 12, etc. From the viewpoint of producing

  As the material of the thin film metal layer 9, the same material as that of the second electrode layer 6 can be used, and the thickness is preferably 5 nm or more and 200 nm or less from the viewpoint of workability and sealing property. More preferably, it is 10 nm or more and 100 nm or less.

  The material of the 2nd electrode layer 6 is not specifically limited, For example, metals, such as silver (Ag) and aluminum (Al), are mentioned. The second electrode layer 6 of this embodiment is made of Al. These materials are preferably deposited by sputtering or vacuum evaporation.

  In addition, the electrical conductivity and thermal conductivity of the second electrode layer 6 are larger than those of the first electrode layer 3. In other words, the second electrode layer 6 has higher electrical conductivity and thermal conductivity than the first electrode layer 3.

  The material of the insulating sealing layer 7 is not particularly limited as long as it has insulating properties and sealing properties, but one or more elements selected from oxygen, carbon, and nitrogen, and silicon It is preferably formed of a silicon alloy composed of an element, and silicon nitride or silicon oxide containing a bond such as Si—O, Si—N, Si—H, or N—H, and an oxynitride that is an intermediate solid solution of both. Particularly preferred is silicon.

  The insulating sealing layer 7 is preferably a layer in which compressive stress is generated in a direction away from the organic EL element 10 under predetermined conditions.

  Here, the “predetermined condition” refers to a case where a pressing force generated due to thermal expansion or the like of the organic EL element 10 is received.

  And as the insulation sealing layer 7, it is preferable to use the insulation sealing layer of a multilayered structure from a viewpoint of improving sealing performance.

  Specifically, the insulating sealing layer 7 includes a first insulating sealing layer formed by a dry method from the organic EL element 10 side and a second insulating sealing layer formed by a wet method in this order. Preferably it is formed.

  The first insulating sealing layer is a layer formed by chemical vapor deposition, and more specifically, is preferably a layer formed by a plasma CVD method using silane gas, ammonia gas, or the like as a raw material. Since the first insulating sealing layer can be formed continuously in the process of forming the organic EL element 10 in an atmosphere with a low moisture content in the manufacturing process of the organic EL flat light source 1 as described later, Film formation can be performed without exposure, and the occurrence of initial dark spots immediately after use can be reduced.

  The second insulating sealing layer is a layer formed through a chemical reaction after applying a liquid or gel material. More specifically, the second insulating sealing layer is preferably made of dense silica. The second insulating sealing layer is preferably made from a polysilazane derivative. When the second insulating sealing layer is formed by silica conversion using a polysilazane derivative, a weight increase occurs during silica conversion, and volume shrinkage is small. Further, it is possible to make cracks sufficiently at a temperature that the resin can withstand when the silica film is converted (solidified).

Here, the polysilazane derivative is a polymer having a silicon-nitrogen bond, and is composed of Si—N, Si—H, N—H, etc., such as SiO ₂ , Si ₃ N ₄ , and an intermediate solid solution SiOxNy thereof. It is a precursor polymer. The polysilazane derivative also includes a derivative in which a hydrogen part bonded to Si is partially substituted with an alkyl group or the like.

  Among the polysilazane derivatives, perhydropolysilazane in which all side chains are hydrogen, and derivatives in which a hydrogen part bonded to silicon is partially substituted with a methyl group are particularly preferable.

  Moreover, it is preferable to apply and use this polysilazane derivative in the solution state melt | dissolved in the organic solvent. As the organic solvent to be dissolved, hydrocarbon solvents such as aliphatic hydrocarbons, alicyclic hydrocarbons and aromatic hydrocarbons, ethers such as halogenated hydrocarbon solvents, aliphatic ethers and alicyclic ethers can be used. .

  Thus, it is preferable that the second insulating sealing layer is formed by laminating a material different from that of the first insulating sealing layer as the sealing layer, and the sealing performance is improved by complementing mutual defects. Thus, it is possible to prevent the generation of new dark spots over time, or to suppress the expansion of the generated dark spots.

  The average thickness of the insulating sealing layer 7 is preferably 1 μm to 10 μm, and more preferably 2 μm to 5 μm.

  The thickness of the first insulating sealing layer serving as a part of the insulating sealing layer 7 is preferably 1 μm to 5 μm, and more preferably 1 μm to 2 μm.

  Further, the thickness of the second insulating sealing layer serving as a part of the insulating sealing layer 7 is preferably 1 μm to 5 μm, and more preferably 1 μm to 3 μm.

  Next, a method for manufacturing the organic EL flat light source 1 according to this embodiment will be described.

  The organic EL flat light source 1 is manufactured by forming a film using a vacuum vapor deposition apparatus and a CVD apparatus (not shown), and patterning using a patterning apparatus (not shown), in this embodiment, a laser scribing apparatus.

  First, the organic EL element formation process which laminates | stacks the organic EL element 10 is performed.

  Specifically, first, the first electrode layer 3 is formed on the entire surface of the translucent substrate 2 by sputtering or CVD, preferably from the viewpoint of cost.

  Then, the 1st electrode layer isolation | separation groove | channel 31 is formed with a laser scribing apparatus with respect to the translucent board | substrate with which the 1st electrode layer 3 was formed into a film, and the 1st electrode layer islands 4-1 to 4-5 are formed. FIG. 3). At this time, the translucent substrate 2 is exposed from the bottom of the first electrode separation grooves 30 and 31.

  Next, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and the like are sequentially stacked on the light-transmitting substrate by a vacuum deposition apparatus, and an organic EL having a light emission color corresponding to each light-emitting region. The functional layer 5 is formed so as to be the element 10 (FIG. 8). At this time, the functional layer 5 is stacked and filled in the first electrode layer separation groove 31.

  FIG. 8 is an explanatory diagram of the manufacturing process of the organic EL flat light source of FIG. 1, and is a plan view in a state after the functional layer 5 is formed. The first electrode layer island 4 is indicated by a broken line for reference.

  When the functional layer 5 is formed, from the viewpoint of reducing the film material cost and shortening the manufacturing tact time, a layer that affects each light emission color is deposited on each light emitting region by mask vapor deposition, which affects the light emission color. It is preferable to form a layer not to be formed on almost the entire surface in common with the light emitting region.

  Thereafter, the second electrode layer connection groove 51 is formed on the light-transmitting substrate on which the functional layer 5 is formed by a laser scribing device (FIG. 5).

  Thereafter, the second electrode layer 6 is formed on almost the entire surface of the translucent substrate on which the functional layer 5 is formed by a vacuum vapor deposition apparatus.

  At this time, a layer made of the same material as the second electrode layer 6 on a layer made of the same material as the first electrode layer 3 in the first electrode layer islands 4-1 to 4-5 in the second electrode layer connection groove 51. The first electrode layer islands 4-1 to 4-5 and the corresponding second electrode layers 6-1 to 6-5 of the organic EL element 10 in each light-emitting region are physically fixed in a state where the tops are in contact with each other. Connected to.

  Thereafter, the second electrode layer separation groove 61 is formed on the light-transmitting substrate on which the second electrode layer 6 is formed by a laser scribing device (FIG. 6).

  The above is the organic EL element forming step.

  Subsequently, an insulating sealing layer stacking step for forming the insulating sealing layer 7 is performed.

  First, almost the entire surface of the light-transmitting substrate is covered with a mask as necessary, and the first insulating seal is preferably formed by a CVD apparatus so as not to form a film on the portion to become the power supply pad connection groove 71-1. A stop layer is formed.

  At this time, the first insulating sealing layer 50 covers at least the second electrode layer 6 in the inner light emitting region 22 and the outer light emitting region 23, and the projection surface in the member thickness direction of the second electrode layer separation groove 61. It extends to the top. That is, the first insulating sealing layer is stacked and filled in the second electrode layer separation groove 61. Therefore, a sufficient sealing function can be ensured.

  Thereafter, the first insulating sealing layer is taken out from the CVD apparatus, the second insulating sealing layer raw material is applied, the second insulating sealing layer is formed, and the insulating sealing layer 7 is formed.

  At this time, the second insulating sealing layer covers the entire surface of the first insulating sealing layer.

  In this manner, the second insulating sealing layer is laminated on the first insulating sealing layer to form the insulating sealing layer 7.

  Subsequently, a process of mounting the power supply pads 11 and 12, the first electrode layer auxiliary electrode 13, and the inner first electrode layer power supply unit 14 on the translucent substrate formed by the above-described procedure is performed.

  First, the power feeding pad connection grooves 71-1 to 71-3 are formed on the light-transmitting substrate on which the insulating sealing layer 7 is formed by a laser scribing device (FIG. 7).

  Thereafter, the power supply pads 11 and 12, the first electrode layer auxiliary electrode 13, and the inner first electrode layer power supply unit 14 having a necessary area are made of a conductive material so as to cover the power supply pad connection grooves 71-1 to 71-3. (FIG. 4).

  The portion related to the inner power feeding portion according to the present invention includes the second electrode layer power feeding pad 12, the first electrode layer island 4, and the second electrode layer connecting groove 51. It is one of the features of the present invention to supply power to the second electrode layer 3 of the organic EL element 10 in the light emitting region 22.

  The inner power feeding portion has a conductive path surrounded by the insulating sealing layer 7 in the surface of the insulating sealing layer 7, which exists as a part of the second electrode layer power supply pad 12 as shown in FIG. 2. .

  At this time, from the viewpoint of improving the sealing performance of the organic EL flat light source 1, it is preferable to cover the entire surface of the power supply pad connection groove 71 with a metal material having excellent conductivity and water vapor barrier properties. In addition, in order to control light emission of each light emitting region independently while using the first electrode layer 3 as a common electrode, the power supply pads 11 and 12 need to be electrically separated from each other, and the surface of the first electrode layer 3 The first electrode layer power supply pad 11, the first electrode layer auxiliary electrode 13, and the inner first electrode layer power supply unit 14 are electrically connected to suppress the occurrence of light emission unevenness by reducing the voltage drop inside It is preferable that

  Thereafter, in order to improve the sealing performance of the organic EL flat light source 1 and to protect it from external stress, a soft bonding is performed as necessary while securing a power feeding path from the outside to the power feeding pads 11 and 12. It is preferable to form a hard sealing resin or a water vapor barrier film on the insulating sealing layer 7 via a resin. Here, from the viewpoint of preventing light emission unevenness by preventing the occurrence of temperature distribution in the organic EL flat light source 1 during light emission, as the water vapor barrier film, a metal film or graphite having a high water vapor barrier property is used. It is preferable to use a film obtained by laminating a resin film on the film.

  In this way, the organic EL flat light source 1 in one embodiment of the present invention is completed.

  As described above, the organic EL flat light source 1 of the present embodiment uses the first electrode layer 3 having a large electric resistance as a common electrode, has a small electric resistance, and is individually provided on the second electrode layer 6 corresponding to each light emitting region. Since the inner light emitting region 22 has a structure surrounded by a continuous outer light emitting region 23, the inner light emitting region 22 can be manufactured without damaging the organic material-containing light emitting layer, and Each of the inner light-emitting region 22 and the outer light-emitting region 23 emits light when a current flows evenly from the circumferential direction during lighting, and the light emission unevenness can be suppressed as a whole of the light-emitting region and within each light-emitting region. This effect is particularly noticeable when the inner light emitting region 22 is circular and the outer light emitting region 23 is surrounded by a donut shape. Therefore, such a form is preferable.

  Next, the organic EL flat light source 100 according to another embodiment of the present invention will be described.

  FIG. 9 is a cross-sectional view with the light emitting surface of the organic EL flat light source 100 facing down according to another embodiment of the present invention. Reference numerals common to the organic EL flat light source 1 indicate common configurations.

  The organic EL flat light source 100 has an inner light emitting region 22 corresponding to the functional layer 5-3 on the inner side of the outer light emitting region 23 corresponding to the functional layer 5-1. It is assumed that 223 corresponds to the outer region, the inner inner region 222 corresponds to the inner region, and the light emitting region corresponding to the functional layer 5-4.

  As an alternative to the first electrode layer island 4 of the organic EL flat light source 1, the organic EL flat light source 100 includes first electrode layer insulating pads 104-1, 104-3, 104-4 corresponding to the respective light emitting regions. . The first electrode layer insulating pad 104 is a first electrode that is a common electrode for the second electrode layer power supply pads 12-1, 12-3, and 12-4 for supplying power to the second electrode layer 6 in each light emitting region. 3 is an insulating member to be formed on the translucent substrate 2 in a state of being electrically insulated from 3. The material of the first electrode layer insulating pad 104 is preferably an insulating thermosetting resin, and more preferably a material that is dried and solidified after applying a so-called cover material.

  It is preferable to form the base conductive layer 106 on each first electrode layer insulating pad 104 and then form the functional layer 5. The material of the functional layer 5 is formed on the base conductive layer 106 temporarily. However, preferably, the base conductive layer 106 is formed of low-temperature melting solder, and the second electrode layer 6 is preferably irradiated with a laser beam and melted together with the base conductive layer 106 so that the second electrode is melted. The layer feeding pad 12 can be reliably electrically connected to the second electrode layer 6.

  The second electrode layer separation groove 61 of the organic EL flat light source 100 is preferably formed into a mask so as to be a non-deposition portion when formed with the second electrode layer 6. In addition, each functional layer is surrounded by each second electrode layer 6 from the viewpoint of improving sealing performance that more effectively prevents moisture from entering each functional layer 5-1, 5-3, 5-4. The second electrode layer insulating pad 105 is formed on the first electrode layer 3 in the same manner as the first electrode layer insulating pad 104 by appropriately selecting each film forming step and each processing step. It is preferable to do.

  The portion related to the inner power feeding portion according to the present invention includes the second electrode layer power feeding pad 12 and the underlying conductive layer 106, and the first of the organic EL elements 10 in the inner light emitting region 22 from the outside through these. It is one of the features of the present invention to supply power to the two-electrode layer 3.

  The inner power feeding portion has a conductive path surrounded by the insulating sealing layer 7 in the surface of the insulating sealing layer 7, which exists as a part of the second electrode layer power supply pad 12 as shown in FIG. 3. .

  As described above, the organic EL flat light source of the present invention includes the second electrode of the organic EL element on the inner side from the insulating sealing layer side opposite to the light emitting surface, in the boundary region between the outer and inner light emitting regions. Equipped with an inner feeding part surrounded by an insulating sealing layer for feeding power to the layer, and the first and second electrode layers of the outer and inner organic EL elements are continuous, and can control light emission independently. And a high-performance organic EL flat light source having a continuous inner light-emitting region and outer light-emitting region, respectively.

1 Organic EL planar light source (one embodiment)
2 Translucent substrate 3 First electrode layer 4 First electrode layer island 5 Functional layer (organic light emitting layer)
6 Second electrode layer 7 Insulating sealing layer 9 Thin film metal layer (included in functional layer 5)
10 Organic EL elements (laminates)
DESCRIPTION OF SYMBOLS 11 1st electrode layer electric power feeding pad 12 2nd electrode layer electric power feeding pad 13 1st electrode layer auxiliary electrode 14 Inner 1st electrode layer electric power feeding part 20 Light emitting area 21 Surrounding non-light emitting area 22 Inner light emitting area 23 Outer light emitting area 24 Boundary area 27 Outer Power feeding area (outer peripheral non-light emitting area)
31 First electrode layer separation groove 51 Second electrode layer connection groove 61 Second electrode layer separation groove 71 Power supply pad connection groove 100 Organic EL planar light source (another embodiment)
104 First electrode layer insulation pad 105 Second electrode layer insulation pad 106 Underlying conductive layer

Claims (6)

Outer light emission, each including a first electrode layer, a functional layer including a light-emitting layer containing an organic material, and a second electrode layer, which are sequentially formed on the same light-transmitting substrate, and capable of independently controlling light emission An organic EL flat light source including an organic EL element in a region and an organic EL element in an inner light emitting region,
In the organic EL flat light source in which the inner light emitting region and the outer light emitting region are continuous, and the inner light emitting region is surrounded by the outer light emitting region,
On the second electrode layer of the outer and inner organic EL elements, an insulating sealing layer covering them is provided,
Insulating sealing within the surface of the insulating sealing layer for supplying power from the insulating sealing layer side to the second electrode layer of the inner organic EL element in the boundary region of the boundary between the outer and inner light emitting regions An inner power supply having a conductive path surrounded by layers, and
An organic EL flat light source characterized in that the first electrode layers of the outer and inner organic EL elements are continuous.   2. The organic EL flat light source according to claim 1, wherein the light emission color of the organic EL element in the inner light emitting region is different from the light emission color of the organic EL element in the outer light emitting region.   The organic EL flat light source according to claim 1, wherein there are a plurality of the inner light emitting regions.   4. The organic according to claim 1, wherein the inner light emitting region further includes an inner inner / outer region corresponding to the outer region and an inner inner / inner region corresponding to the inner region. EL flat light source.   A conductive path surrounded by the insulating sealing layer in the insulating sealing layer surface for supplying power to the first electrode layer in at least one of the boundary regions adjacent to each other of the plurality of inner light emitting regions; The organic EL flat light source according to claim 3, further comprising an inner first electrode layer power feeding unit. A first electrode layer island which is a first electrode layer island formed on the translucent substrate with the same material as the first electrode layer and is electrically separated from the first electrode layer; Electrical connection and
6. The first electrode layer island according to claim 1, wherein the first electrode layer island is electrically connected to the second electrode layer by a second electrode layer connecting groove formed of the same material as the second electrode layer. The organic electroluminescent planar light source in any one.