JP4924377B2 - LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE - Google Patents

Description

  The present invention relates to a light emitting device and an electronic apparatus.

  In recent years, a light emitting device including a light emitting element such as an organic EL element (organic electroluminescence element) on a substrate has been widely used as an exposure device for a display device or an electrophotographic image forming apparatus.

  Such a light emitting device is required to have durability to withstand light emission for a long period of time. As one of the causes for deteriorating the light emission characteristics of the organic EL element, generation of dark spots is raised. A dark spot is formed by a transparent electrode, a light emitting layer (organic layer), and a back electrode when moisture adhering to the surface of a component part of the organic EL element or moisture (humidity) or oxygen gas entering the organic EL element Is caused by intrusion from a defect or the like on the surface of the back electrode into a laminate formed by sequentially laminating and separating the organic layer and the back electrode.

  In such a light emitting device, in order to improve the reliability and extend the life of the organic EL element, it is important that the light emitting layer and each electrode constituting the organic EL element are surely shielded from the atmospheric gas. For this purpose, the substrate (transparent substrate) on which the organic EL element portion is formed and the sealing member are integrated via an adhesive to protect the organic EL element sealed between them from atmospheric gas or the like. Technology is known. A wider adhesive width (seal area) is more advantageous for preventing moisture from entering as much as possible and preventing deterioration of the light-emitting element (sealing performance), and the sealing performance increases in proportion to the adhesive width. It is known to be.

  For example, on a translucent substrate made of a glass material as disclosed in Patent Document 1, a transparent electrode such as ITO, which becomes an anode, an organic layer having at least a light emitting layer made of an organic compound, and a cathode A laminated body is formed by sequentially laminating a non-translucent back electrode such as aluminum (Al), and a concave sealing member made of a glass material covering the laminated body is hermetically sealed on the substrate via an adhesive. A light-emitting device is known in which a moisture absorbent formed by a compound that chemically adsorbs moisture and maintains a solid state even when adsorbed is disposed on a surface facing the laminate of sealing members. It has been.

JP 2002-8855 A

  However, as shown in FIG. 15, in recent years, as represented by a display panel of a mobile phone, the frame region 300 (region on the outer periphery of the display region 302, which is a region where the light emitting element 303 is disposed) is as narrow as possible. Is required. However, in order to narrow the frame, it is necessary to narrow the sealing region 306 in which the sealing member 304 is disposed. If the sealing region 306 is narrowed, the sealing performance is impaired, and the narrowing of the frame and the sealing performance are ensured. It is difficult to achieve both. The sealing member 304 contains a gap material (silica, plastic, etc.) 314 to keep the gap 312 between the sealing substrate 308 and the substrate 310 constant. Further, a filler (silica or the like) 316 is contained in order to improve moisture resistance or to improve workability by controlling the elastic modulus of the sealing member 304. As a result, pressure is applied when the sealing substrate 308 and the substrate 310 are bonded to each other, but when the sealing member 304 covers the multilayer wiring region 322 in which a plurality of wirings 320 are stacked, wiring is performed by the gap material 314 and the filler 316. A leak or a short circuit may occur between 320. In addition, when the sealing member 304 covers the switching element region 326 in which the switching element 324 is disposed, the switching element 324 may not function or the characteristics may deteriorate. Therefore, the seal region 306 needs to be arranged separately without overlapping the display region 302, the multilayer wiring region 322, and the switching element region 326.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.
The light emitting device of the present invention includes a light emitting element including at least a light emitting layer, a switching element for driving the light emitting element, a stacked wiring connecting at least the light emitting element and the switching element, and the light emitting element. A substrate on which the switching element and the stacked wiring are disposed; and a sealing substrate disposed on the substrate via a plurality of sealing members and covering the light emitting element, the plurality of sealings The member includes a first sealing member and a second sealing member. The first sealing member surrounds an outer periphery of the light emitting element, and the light emitting element, the switching element, and the stacked wiring are disposed. The second sealing member surrounds the outer periphery of the first sealing member, and the first sealing member surrounds the first sealing member. The sealing member is the first grain Include things, the second sealing member comprises a second granulate, the volume of the first granules, and is smaller than the volume of said second granulate.

  Application Example 1 A light emitting element including at least a light emitting layer, a switching element for driving the light emitting element, a stacked wiring connecting at least the light emitting element and the switching element, the light emitting element and the switching A substrate on which an element and the laminated wiring are disposed, and a sealing substrate that is disposed on the substrate via a plurality of sealing members and covers the light emitting element, and the plurality of sealing members includes The first sealing member surrounds the outer periphery of the light emitting element, and each of the light emitting element, the switching element, and the stacked wiring is disposed. A light emitting device, wherein the second sealing member is disposed so as to overlap with at least a part of the mounting surface, and the second sealing member surrounds an outer periphery of the first sealing member. .

  According to this, the first sealing member is arranged so as to overlap with at least a part of the arrangement surface of each arrangement surface on which the light emitting element, the switching element, and the laminated wiring are arranged. When the adhesive width is the same as that in the conventional case, the frame width can be reduced, so that a light-emitting device that can be reduced in size can be provided. In addition, when the frame width is the same as the conventional one, the seal width can be increased, so that the deterioration of the element can be prevented by improving the sealing performance, and a light-emitting device with a long life can be provided. Furthermore, high sealing performance can be obtained even with a narrow frame, and a light emitting device that is small and has a long life can be provided.

  Application Example 2 In the above light-emitting device, the second sealing member includes a granular material, and the first sealing member does not include a granular material.

  According to this, it becomes easy to prevent effectively the damage of the light emitting element by the 1st sealing member, the switching element, and the laminated wiring. Moreover, it becomes easy to set the gap between the substrate and the sealing substrate effectively by the second sealing member.

  Application Example 3 In the light emitting device, the first sealing member includes a first granular material, the second sealing member includes a second granular material, and the first The volume of a granular material is smaller than the volume of said 2nd granular material, The light-emitting device characterized by the above-mentioned.

  According to this, it becomes easy to prevent effectively the damage of the light emitting element by the 1st sealing member, the switching element, and the laminated wiring. Moreover, it becomes easy to set the gap between the substrate and the sealing substrate effectively by the second sealing member.

  Application Example 4 An electronic apparatus including the light-emitting device according to any one of the above and a control unit for controlling the light-emitting device.

  According to this, by using any of the light-emitting devices described above, it is possible to provide a small and long-life electronic device.

  This embodiment will be described below with reference to the drawings. In each of the drawings used for the description, the scale of each layer and each member is different in order to make each layer and each member recognizable on the drawing.

(First embodiment)
(Organic EL device)
FIG. 1A is a plan configuration diagram of an organic EL device (organic electroluminescence device) 10 as a light emitting device according to the first embodiment, and FIG. 1B is a cross-sectional view taken along line I- of FIG. It is a section lineblock diagram which meets an I line.
As shown in FIGS. 1A and 1B, the organic EL device 10 according to the present embodiment sandwiches the light emitting element 14 between the substrate 12, the light emitting element 14 provided on the substrate 12, and the substrate 12. Mainly a sealing substrate 16 facing the substrate 12. On the substrate 12, in addition to the light emitting element 14, a switching element (thin film transistor) 18 for driving the light emitting element 14, a stacked wiring 20 connecting at least the light emitting element 14 and the switching element 18, and the light emitting element 14 and the switching element 18 and an interlayer insulating layer 22 covering the laminated wiring 20 are provided. In addition to the above, between the substrate 12 and the sealing substrate 16, an adsorbent 24 provided facing the light emitting element 14, and a first sealing member 26 provided surrounding the light emitting element 14, And a second sealing member 28 provided so as to surround the first sealing member 26. In FIG. 1A, the sealing substrate 16 is not shown for easy viewing of the drawing.

  The organic EL device 10 according to the present embodiment employs either a form in which light emitted from the light emitting element 14 is extracted from the substrate 12 side to the outside (bottom emission type) or a form in which the light emission is extracted from the sealing substrate 16 side (top emission type). be able to. In the case of the bottom emission type, the substrate 12 is made of a transparent or translucent material that can transmit light, for example, transparent glass, quartz, sapphire, or a transparent synthetic material such as polyester, polyacrylate, polycarbonate, or polyetherketone. It is formed using a resin or the like. In the case of the top emission type, a transparent or translucent material is used for the interlayer insulating layer 22, the adsorbent 24, and the sealing substrate 16.

  FIG. 2 is a partially enlarged cross-sectional configuration diagram of an organic EL device (organic electroluminescence device) 10 as a light emitting device according to the first embodiment. As shown in FIG. 2, the organic EL device 10 includes a display area 30, a frame area 32, a multilayer wiring area 34, a switching element area 36, and a seal area 38.

  The display area 30 is an area of the arrangement surface of the light emitting elements 14 arranged on the substrate 12. The frame area 32 is an outer peripheral area of the display area 30 on the substrate 12. The multilayer wiring region 34 is a region on the arrangement surface of the wiring 20 arranged and laminated on the substrate 12. The switching element region 36 is a region on the surface where the switching element 18 disposed on the substrate 12 is disposed. The seal area 38 is an area of the arrangement surface of the first and second sealing members 26 and 28 arranged on the substrate 12.

  The first sealing member 26 disposed in the seal region 38 is disposed so as to surround the outer periphery of the light emitting element 14. Further, the first sealing member 26 is disposed so as to overlap with at least a part of the disposed surfaces on which the light emitting element 14, the switching element 18, and the stacked wiring 20 are disposed. Has been. In other words, the seal region 38 is disposed so as to overlap at least part of the display region 30, the multilayer wiring region 34, and the switching element region 36. The second sealing member 28 is disposed so as to surround the outer periphery of the first sealing member 26.

  Returning to FIG. 1, the sealing substrate 16 is disposed on the substrate 12 via a plurality of sealing members, and covers the light emitting element 14. The sealing substrate 16 is bonded to the substrate 12 via the first sealing member 26 and the second sealing member 28 provided so as to surround the outer periphery of the first sealing member 26, and the light emitting element 14 is sealed. The sealing substrate 16 only needs to have a function capable of satisfactorily protecting the light emitting element 14. For example, a material having a low moisture permeability such as glass, quartz, synthetic resin, or metal can be used. As the glass, for example, soda lime glass, lead alkali glass, borosilicate glass, aluminosilicate glass, silica glass and the like can be used. As the synthetic resin, transparent synthetic resins such as polyolefin, polyester, polyacrylate, polycarbonate, polyether ketone, and the like can be used. As the metal, aluminum, stainless steel, or the like can be used. By using a glass substrate as the sealing substrate 16 and covering the light emitting element 14, it is possible to satisfactorily prevent moisture (humidity), oxygen, or the like from entering the light emitting element 14.

  The light-emitting element 14 is an organic EL element in which an organic functional layer including an organic light-emitting layer as an electro-optical material is sandwiched between two electrode films as a first electrode and a second electrode on a substrate 12. As shown in FIG. 3, a structure in which an anode 40, a hole transport layer 42, a light emitting layer 44, and a cathode 46 are laminated is provided. The light emitting element 14 is configured in various modes depending on the application of the organic EL device 10. For example, the light emitting element 14 is formed in a planar shape for lighting applications. In the case of use as a display means of an electronic device, a plurality of light emitting elements 14 are arranged in a substantially matrix shape in plan view. Furthermore, if it is the use as an exposure means of a printer, it will become the form with which the several light emitting element 14 was arranged in 1 row or multiple rows.

Returning to FIG. 1, the interlayer insulating layer 22 is a thin film of an inorganic insulating material, and has a function of suppressing moisture and the like from entering the light emitting element 14. Examples of the material for forming the interlayer insulating layer 22 include silicon oxynitride (SiON), silicon dioxide (SiO ₂ ), and silicon nitride (SiN).

  The adsorbent 24 is provided on the sealing substrate 16. An adsorbent 24 is provided in a substantially rectangular shape in plan view so as to face the interlayer insulating layer 22 formed in a substantially rectangular shape in plan view. In the present embodiment, the adsorbent 24 is formed in a substantially rectangular shape in plan view. However, for example, the adsorbent 24 may be formed in a frame corresponding to the shape of the light emitting element 14, the interlayer insulating layer 22, or the like. You may form in the arbitrary frames surrounding 14. In the case of the present embodiment, as shown in FIG. 1B, the adsorbent 24 is provided with an interlayer insulating layer 22 and a gap 48 facing each other, and further, the adsorbent 24 is sandwiched between the substrate 12 and the sealing substrate 16. It is disposed in contact with the sealing substrate 16. That is, it is preferable that the adsorbent 24 can maintain a predetermined planar shape and cross-sectional shape. For example, an adsorbing material (dehydrating material and oxygen scavenger) that exhibits an adsorbing action such as moisture (humidity) or oxygen is used. Favorable moldability can be imparted to the adsorbent by using a material dispersed in a binder such as resin, wax, oil or fat.

  As the adsorbing material, a material that does not easily react with the organic compound constituting the binder is used. For example, calcium hydride, strontium hydride, barium hydride, lithium aluminum hydride, sodium oxide, potassium oxide, calcium oxide, barium oxide. And magnesium oxide.

  As the binder, resins, waxes, fats and oils can be used. To give specific examples, resin materials such as polyethylene resins and polypropylene resins, petroleum waxes such as paraffin wax and microlistin wax, plant waxes, Examples thereof include animal waxes, mineral waxes, fatty acids, fatty acid esters, fatty acid amides and aliphatic amines.

  When the adsorbent 24 does not use a mixed material of a binder and an adsorbing material, the adsorbent 24 has a desired adsorbing function in the sealing space including the gap 48 between the substrate 12 and the sealing substrate 16. The adsorbing material is not limited as described above, and various materials can be used. For example, silica gel, zeolite, activated carbon, calcium oxide, germanium oxide, phosphorus pentoxide, calcium chloride, or the like can be used alone or in combination. Further, if such a gap 48 is provided, even when moisture (humidity), oxygen, or the like enters the gap 48 through the first sealing member 26, moisture (humidity) or Oxygen or the like diffuses and the load on the adsorbent 24 can be made uniform on the peripheral surface. Therefore, according to such a configuration, a good adsorption effect can be obtained over a long period of time, and the reliability and durability of the organic EL device can be improved.

  The first sealing member 26 is provided on the sealing substrate 16. The first sealing member 26 is formed in a rectangular frame shape in plan view that surrounds the outer periphery of the light emitting element 14, and is sandwiched between the substrate 12 and the sealing substrate 16. In the case of the present embodiment, the first sealing member 26 also functions as an adhesive that bonds the substrate 12 and the sealing substrate 16 together. A material for forming the first sealing member 26 is not particularly limited as long as it can maintain stable adhesive strength and has good airtightness. For example, a photo-curable epoxy resin that is cured by irradiation with ultraviolet light (UV) is used. In addition to cationic materials such as epoxy and vinyl ether, radical materials such as acrylates such as ester acrylate and urethane acrylate, and urethane polyester Can be used.

  The first sealing member 26 is preferably formed using a material having a low elastic modulus, and is preferably formed using a material having a lower elastic modulus than the second sealing member 28 described later. By setting the elastic modulus smaller than that of the second sealing member 28, the sealing substrate 16 can be supported by the second sealing member 28, so that the formation becomes easy.

  Further, the first sealing member 26 has a configuration in which a granular material (gap material such as a spacer) 50 that separates the substrate 12 and the sealing substrate 16 at a predetermined interval is not mixed therein. With such a configuration, it is possible to prevent the light emitting element 14, the switching element 18, and the stacked wiring 20 from being damaged by the pressing force when the sealing substrate 16 is attached. The first sealing member 26 is provided with a filler (silica or the like) 52 in order to improve moisture resistance inside or to improve workability by controlling the elastic modulus of the first sealing member 26. It is good also as a mixed structure.

  The second sealing member 28 is provided on the sealing substrate 16. The second sealing member 28 is formed in a rectangular frame shape that surrounds the outer periphery of the first sealing member 26 and is sandwiched between the substrate 12 and the sealing substrate 16. In the case of this embodiment, the second sealing member 28 also functions as an adhesive that bonds the substrate 12 and the sealing substrate 16 together. The material for forming the second sealing member 28 is not particularly limited as long as it can maintain a stable adhesive strength as in the case of the first sealing member 26 and has good airtightness. A curable resin material can be used. As a material for forming the second sealing member 28, a photo-curable epoxy resin that is cured by irradiation with ultraviolet light (UV) can be used.

  The second sealing member 28 is preferably formed using a material having a low transmittance such as moisture (humidity) or oxygen as compared with the first sealing member 26. In this way, by having a configuration in which the outermost peripheral portion of the apparatus is blocked by a material having low permeability such as moisture (humidity) and oxygen, the arrival of moisture (humidity) and oxygen etc. to the adsorbent 24 arranged on the inner side. The amount of moisture that reaches the light-emitting element 14 can be reduced, and the time until moisture (humidity), oxygen, or the like reaches the light-emitting element 14 can be extended. Can be realized.

  Further, unlike the first sealing member 26, the second sealing member 28 has a configuration in which a granular material 50 that separates the substrate 12 and the sealing substrate 16 at a predetermined interval is mixed. With such a configuration, it is possible to prevent the light emitting element 14 from being damaged by the pressing force when the sealing substrate 16 is attached. Note that the second sealing member 28 may have a configuration in which a filler 52 is mixed therein as in the first sealing member 26.

  As described above, the organic EL device 10 of the present embodiment can achieve good sealing performance with respect to the light emitting element 14 by the double sealing structure of the first and second sealing members 26 and 28. it can. Thus, the first sealing member 26 is disposed so as to overlap with at least a part of the disposed surfaces on which the light emitting element 14, the switching element 18, and the stacked wiring 20 are disposed. In contrast, when the adhesive width is made the same as in the conventional case, the frame width can be reduced, so that an organic EL device that can be miniaturized can be provided. In addition, when the frame width is the same as the conventional frame width, the seal width can be increased, so that the deterioration of the element can be prevented by improving the sealing performance, and an organic EL device having a long life can be provided. Furthermore, high sealing performance can be obtained even with a narrow frame, and a small and long-life organic EL device can be provided.

(Method for manufacturing organic EL device)
Next, a method for manufacturing the organic EL device 10 having the above-described configuration will be described with reference to schematic diagrams shown in FIGS. 4A to 6B, FIG. 4A is a plan process diagram in each process, and FIG. 4B is a sectional process diagram corresponding to a position along each sectional line in FIG. In FIG. 6A, the sealing substrate 16 is not shown for easy viewing of the drawing.

First, as shown in FIG. 3, the light emitting element 14 is formed on the substrate 12. Although not shown in FIG. 3, a switching element 18 (see FIG. 4B) for driving and controlling the light emitting element 14 is already formed on the substrate 12 on which the light emitting element 14 is formed. .
The light emitting element 14 can be formed by sequentially laminating the anode 40, the hole transport layer 42, the light emitting layer 44, and the cathode 46 in a predetermined region on the substrate 12. When the light emitting element 14 having such a laminated structure is supplied with a drive signal from the switching element 18, a current flows between the anode 40 and the cathode 46 and the light emitting layer 44 emits light. The light is emitted to the outer surface side of the transparent substrate 12.

  In the laminated structure shown in FIG. 3, the anode 40 is connected to a switching element 18 (not shown), and holes are injected into the hole transport layer 42 by a voltage applied from the switching element 18. For example, a transparent conductive material such as ITO (Indium Tin Oxide) or a metal material such as aluminum or silver can be used.

  The hole transport layer 42 is for transporting and injecting holes of the anode 40 to the light emitting layer 44, and a known material can be used. For example, polythiophene, polyaniline, polypyrrole, or the like can be used. More specifically, 3,4-polyethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) or the like can be used.

  The light emitting layer 44 is a layer that emits light by recombination of holes injected from the hole transport layer 42 and electrons injected from the cathode 46. As a material for forming the light emitting layer 44, a known light emitting material capable of emitting fluorescence or phosphorescence can be used. For example, polyfluorene derivative (PF), (poly) paraphenylene vinylene derivative (PPV), polyphenylene derivative (PP), polyparaphenylene derivative (PPP), polyvinylcarbazole (PVK), polythiophene derivative, polymethylphenylsilane (PMPS) Polysilanes such as those can be used.

  Further, an electron transport layer may be provided between the light emitting layer 44 and the cathode 46. By providing the electron transport layer, the injection efficiency of electrons from the cathode 46 to the light emitting layer 44 can be improved. As the material for forming the electron transport layer, oxadiazole derivatives, anthraquinodimethane and its derivatives, benzoquinone and its derivatives, naphthoquinone and its derivatives, anthraquinone and its derivatives, tetracyanoanthraquinodimethane and its derivatives, fluorenone derivatives, Diphenyldicyanoethylene and derivatives thereof, diphenoquinone derivatives, metal complexes of 8-hydroxyquinoline and derivatives thereof, and the like can be used.

  The cathode 46 is a metal having a low work function that can efficiently inject electrons into the light emitting layer 44, such as aluminum (Al), magnesium (Mg), gold (Au), silver (Ag), or calcium (Ca). And a structure in which a transparent conductive film such as ITO is laminated on the metal film.

In providing each of the layers constituting the light-emitting element 14, a known patterning method such as a photolithography method or a droplet discharge method can be used, and each layer is laminated in a predetermined region on the substrate 12. A light-emitting element 14 having a structure can be provided.
For the formation of the anode 40 and the cathode 46 made of a metal material or a transparent conductive material, a sputtering method, a vacuum evaporation method, and a photolithography method can be suitably used, and a hole transport layer made of a polymer material For the formation of 42 and the light emitting layer 44, a droplet discharge method can be suitably used.

  The droplet discharge method is a method in which a material for forming a functional layer to be formed is made into a liquid material, and the liquid material is quantitatively discharged using a droplet discharge device such as a dispenser or an ink jet device, so that This is a method of applying a forming material. Specifically, the amount of liquid per droplet is controlled from the nozzle while relatively moving the nozzle and the substrate 12 with the nozzle provided in the droplet discharge head (inkjet head) and the substrate 12 facing each other. In this technique, a film pattern having a desired shape is formed on the substrate 12 by discharging liquid droplets.

  By forming the hole transport layer 42 and the light emitting layer 44 by using a droplet discharge method, the manufacturing cost can be reduced. That is, in the droplet discharge method, since a material can be disposed in a desired local region on the substrate 12, the film formation process is simple and the use material is less wasteful than the photolithography method or the like. .

  After the light emitting element 14 is formed on the substrate 12, next, as shown in FIG. 4, the light emitting element 14, the switching element 18 and the laminated wiring 20 are covered with an interlayer insulating layer 22 by a predetermined method. In the present embodiment, the interlayer insulating layer 22 is coated on the surface of the light emitting element 14 by using a film forming method such as an ion plating method or a sputtering method. Accordingly, the interlayer insulating layer 22 is connected to the surface of the light emitting element 14 so as to cover the light emitting element 14. By covering the surface of the light emitting element 14 with the interlayer insulating layer 22 having a predetermined thickness, it is possible to prevent the light emitting element 14 from contacting moisture or the like even during the manufacturing process of the organic EL device 10. Is well sealed.

  Next, as shown in FIG. 5, first and second sealing members 26 and 28 having a rectangular frame shape in plan view are formed along the periphery of the substrate surface on the side where the light emitting element 14 is disposed. For example, a resin material such as an epoxy resin is applied to the illustrated planar shape using a dispenser or an inkjet device. At this time, as the resin material of the second sealing member 28, a material mixed with a spacer (granular material 50) for adjusting the distance between the substrate 12 and the sealing substrate 16 is used. As the spacer, glass beads, resin beads, or the like can be used. Further, as the resin material of the first sealing member 26, a material mixed with a spacer (granular material 50) for adjusting the distance between the substrate 12 and the sealing substrate 16 is not used. In addition, it is preferable to perform each manufacturing process in inert gas atmosphere, such as nitrogen gas and argon gas, in order to prevent deterioration of the light emitting element 14. FIG.

  It is preferable that the resin material disposed on the substrate 12 is capable of obtaining a sealing property by being in close contact with the sealing substrate 16 when the sealing substrate 16 is disposed in a subsequent process. For this reason, in the subsequent steps, it is held in a state where it can be adhered to the sealing substrate 16, but after being placed on the substrate 12, curing (temporary curing) may be performed to such an extent that adhesion is not impaired. By performing temporary curing, the viscosity of the resin material constituting the first and second sealing members 26 and 28 can be increased, and the shape can be satisfactorily retained on the substrate 12. It is possible to prevent a decrease in yield due to a defective shape of the sealing members 26 and 28, and it is possible to improve the handleability of the substrate in the subsequent process.

  Next, as shown in FIG. 6, a desiccant forming material is arranged in a substantially rectangular shape in plan view opposite to the interlayer insulating layer 22 on the sealing substrate 16 inside the first sealing member 26 and adsorbed. Agent 24 is formed. As the desiccant forming material, it is preferable to use a material obtained by mixing an adsorbing material and a binder as described above. By applying such a desiccant forming material using a dispenser or an ink jet apparatus, a planar adsorbent 24 as shown in FIG. 6 can be easily formed.

  The desiccant-forming material preferably has a viscosity of 20 Pa · s or more when disposed on the sealing substrate 16. By disposing such a relatively high-viscosity material, the shape of the desiccant-forming material after being disposed on the sealing substrate 16 can be favorably maintained. The desiccant-forming material preferably has a viscosity higher than that of the resin material for forming the first sealing member 26, which is disposed in a region surrounded by the adsorbent 24 in a subsequent step.

  In addition, after applying the desiccant forming material on the sealing substrate 16, the desiccant forming material may be temporarily cured in the same manner as in the step of forming the first and second sealing members 26 and 28. . By performing temporary curing, it is possible to prevent the desiccant-forming material from being excessively wet and spread on the sealing substrate 16 over time, which contributes to an improvement in the yield of the organic EL device and an improvement in the handling properties of the substrate.

  In the present embodiment, the adsorbent 24 is arranged at a position having a gap 48 (see FIG. 1B) between the adsorbent 24 and the interlayer insulating layer 22. By forming such a gap 48, the gap 48 can be used as a buffer region when the sealing substrate 16 is deposited on the substrate 12, and also after the sealing substrate 16 is deposited. If 48 is held, it can also function as a region for holding moisture, oxygen, etc. that have passed through the first sealing member 26 and entered the inside of the device, and it is inward from the interlayer insulating layer 22. Intrusion of moisture and the like can be mitigated.

Then, after the adsorbent 24 is formed on the sealing substrate 16, the sealing substrate 16 is attached onto the substrate 12 (see FIG. 1). In the manufacturing process of the organic EL device 10 of the present embodiment, the step of arranging the sealing substrate 16 is to prevent bubbles and the like from being mixed between the sealing substrate 16 and the first sealing member 26. The process is performed under a reduced pressure environment, and the sealing substrate 16 is applied to the light emitting element 14 side by atmospheric pressure by returning to atmospheric pressure after the sealing substrate 16 is deposited. Thereafter, when a thermosetting resin material is used as the resin material for forming the first sealing member 26, predetermined heat is applied to the resin material on the substrate 12.
Through the above steps, the resin material is cured to form the first and second sealing members 26 and 28, and the sealing substrate 16 is bonded via the first and second sealing members 26 and 28. The organic EL device 10 can be manufactured.

  In this embodiment, when the resin material is arranged on the substrate 12, the existing adsorbent 24 on the substrate 12 defines a region where the resin material spreads on the substrate 12, and the resin material is necessary. It is possible to prevent the layer thickness of the first sealing member 26 from becoming thinner than the design value by spreading as described above, and there is no gap between the sealing substrate 16 and the first sealing member 26. Can be prevented from occurring.

  As described above, according to the manufacturing method of the present embodiment, since the resin material and the desiccant forming material are arranged after the interlayer insulating layer 22 is provided on the light emitting element 14, the sealing step It is possible to prevent the light emitting element 14 from deteriorating due to the solvent contained in the resin material or the desiccant forming material in contact with the light emitting element 14, and the organic EL device 10 can be manufactured with a high yield.

(Second Embodiment)
Next, the second embodiment will be described. This embodiment is different from the above embodiment in the size of each granular material mixed in the first and second sealing members, and the other points are the same as the above embodiment.

  FIG. 7 is a partially enlarged cross-sectional configuration diagram of an organic EL device (organic electroluminescence device) 54 as a light emitting device according to the present embodiment. As shown in FIG. 7, in the organic EL device 54 according to the present embodiment, the first sealing member 26 has a first granular material (with a predetermined interval between the substrate 12 and the sealing substrate 16). The gap material 56 such as a spacer) is mixed. The second sealing member 28 has a configuration in which a second granular material (gap material such as a spacer) 58 that separates the substrate 12 and the sealing substrate 16 at a predetermined interval is mixed therein. The volume of the first granular material 56 is smaller than the volume of the second granular material 58. With such a configuration, it is possible to prevent the switching element 18 and the stacked wiring 20 from being damaged by the pressing force when the sealing substrate 16 is attached.

(Example)
(Organic EL display device)
Next, an organic EL display device 100 that is an example of the organic EL device will be described with reference to FIGS.
FIG. 8 is a circuit configuration diagram of the organic EL display device 100 according to the present embodiment, and FIG. 9 is a plan configuration diagram of the display device. FIG. 10 is a diagram showing a planar structure of the pixel 102 of the display device, and FIG. 10A is a diagram mainly showing a pixel driving portion such as a TFT (thin film transistor) in the pixel 102, and FIG. FIG. 5 is a diagram showing banks (partition wall members) that partition pixels. 11 is a cross-sectional configuration diagram taken along line XI-XI in FIG.

  In the circuit configuration illustrated in FIG. 8, the organic EL display device 100 includes a plurality of scanning lines 104, a plurality of signal lines 106 extending in a direction intersecting the scanning lines 104, and a plurality of signal lines 106 extending in parallel to the signal lines 106. The common power supply line 108 is wired, and a pixel 102 is provided at each intersection of the scanning line 104 and the signal line 106.

  For the signal line 106, a data side driving circuit 110 including a shift register, a level shifter, a video line, an analog switch, and the like is provided. On the other hand, for the scanning line 104, a scanning side driving circuit 112 including a shift register, a level shifter, and the like is provided. Each pixel 102 has a switching element (thin film transistor) 18 to which a scanning signal is supplied to the gate electrode via the scanning line 104, and a holding for holding an image signal supplied from the signal line 106 via the switching element 18. The capacitor CAP, the driving TFT 116 to which the image signal held by the holding capacitor CAP is supplied to the gate electrode, and the common feeding line 108 are driven when electrically connected to the common feeding line 108 via the driving TFT 116. A pixel electrode 118 through which a current flows and a light emitting unit 122 sandwiched between the pixel electrode 118 and the common electrode 120 are provided. An element constituted by the pixel electrode 118, the common electrode 120, and the light emitting unit 122 is an organic EL element (light emitting element).

  Under such a configuration, when the scanning line 104 is driven and the switching element 18 is turned on, the potential of the signal line 106 at that time is held in the holding capacitor CAP, and is driven according to the state of the holding capacitor CAP. The on / off state of the TFT 116 is determined. Then, a current flows from the common power supply line 108 to the pixel electrode 118 through the channel of the driving TFT 116, and further a current flows to the common electrode 120 through the light emitting unit 122, so that the light emitting unit 122 corresponds to the amount of current flowing therethrough. Flashes.

  Next, as shown in the planar configuration of FIG. 9, the organic EL display device 100 includes a display region 30 in which a plurality of pixels 102 are arranged in a matrix in a plan view at a substantially central portion of a rectangular substrate 12. The adsorbent 24 is formed so as to cover the display area 30. A first sealing member 26 having a rectangular frame shape in plan view is provided surrounding the display area 30 and the adsorbent 24, and a second sealing member having a rectangular frame shape in plan view surrounding the first sealing member 26. A member 28 is provided. And the sealing substrate 16 is arrange | positioned so that the display area 30, the adsorption agent 24, the 1st sealing member 26, and the 2nd sealing member 28 may be covered planarly.

  That is, the organic EL display device 100 is a display device having a basic configuration similar to that of the organic EL device 10 of the previous embodiment, and includes a pixel 102 having an organic EL element corresponding to the light emitting element 14 of the organic EL device 10. The arrangement is such that the arrayed display region 30 is double sealed by the first sealing member 26 and the second sealing member 28.

  Further, a gap 48 (see FIG. 1B) is provided between the adsorbent 24 and the display area 30, and, like the previous embodiment, passes through the first sealing member 26 and passes through the inside. It is possible to diffuse moisture and the like that have entered the surface, to uniformize the load on the adsorbent 24 on its peripheral surface, suppress local deterioration of the adsorbent 24, and improve reliability.

  Next, in the planar structure of the pixel 102 illustrated in FIG. 10A, the pixel 102 includes four sides of a pixel electrode 118 having a substantially rectangular shape in plan view, the signal line 106, the common power supply line 108, the scanning line 104, and The arrangement is surrounded by other pixel electrode scanning lines (not shown). A switching element 18 and a driving TFT 116 are provided in the vicinity of the pixel electrode 118.

  The switching element 18 is a top-gate thin film transistor mainly composed of a rectangular island-shaped semiconductor layer 138, and the scanning line 104 that intersects the semiconductor layer 138 serves as the gate electrode of the switching element 18 at the intersection. . A branch wiring 106A extending in the direction along the scanning line 104 from the signal line 106 extending in the vertical direction in the figure is electrically connected to the semiconductor layer 138 via a contact hole C1. Furthermore, a relay electrode 140 having a rectangular shape in plan view disposed on the right side of the pixel electrode 118 in the drawing is electrically connected to the semiconductor layer 138 through a contact hole C2.

  The driving TFT 116 is a top-gate thin film transistor mainly including a rectangular island-shaped semiconductor layer 142, and includes a gate electrode 144 G, a source electrode 146 (a part of the power supply line 108), and a drain electrode 148. ing. The drain electrode 148 is electrically connected to the pixel electrode 118 via a contact hole (not shown) (see FIG. 11). The gate electrode 144G extends downward from the position overlapping the semiconductor layer 142 and is formed integrally with the electrode 150 of the storage capacitor CAP. Further, the electrode 150 extends downward in the figure, and is electrically connected to the relay electrode 140 disposed so as to overlap with the electrode 150 via a contact hole C3. Therefore, the gate of the driving TFT 116 and the drain of the switching element 18 are electrically connected via the relay electrode 140.

  Further, when the cross-sectional structure of the pixel 102 shown in FIG. 11 is seen, a driving TFT 116 is provided on the substrate 12, and on the substrate 12 through a plurality of insulating films formed to cover the driving TFT 116. An organic EL element 152 is formed. The organic EL element 152 is mainly composed of an organic functional layer (light emitting part) 122 provided in a region surrounded by banks (inorganic banks 154 and organic banks 156) erected on the substrate 12, and this organic function A structure in which the layer 122 is sandwiched between the pixel electrode 118 and the common electrode 120 is provided. Here, in the planar structure shown in FIG. 10B, the organic bank 156 has an opening 158 having a substantially rectangular shape in plan view corresponding to the formation region of the pixel electrode 118. The previous organic functional layer 122 is formed.

  As shown in FIG. 11, the driving TFT 116 includes a channel region 144C via a source region 144A, a drain region 144B, a channel region 144C formed in the semiconductor layer 142, and a gate insulating film 160 formed on the surface of the semiconductor layer. And a gate electrode 144G opposite to the main body. A first interlayer insulating film 162 that covers the semiconductor layer 142 and the gate insulating film 160 is formed, and drains are respectively formed in the contact holes 164 and 166 that penetrate the first interlayer insulating film 162 and reach the semiconductor layer 142. An electrode 148 and a source electrode 146 are embedded, and each electrode is conductively connected to the drain region 144B and the source region 144A. A second interlayer insulating film 168 is formed on the first interlayer insulating film 162, and a part of the pixel electrode 118 is embedded in a contact hole penetrating through the second interlayer insulating film 168. Yes. The pixel electrode 118 and the drain electrode 148 are conductively connected, so that the driving TFT 116 and the pixel electrode 118 (organic EL element 152) are electrically connected.

  An inorganic bank (first partition wall layer) 154 made of an inorganic insulating material is formed on the second interlayer insulating film 168, and the inorganic bank 154 is arranged so as to partially ride on the peripheral edge of the pixel electrode 118. Has been. On the inorganic bank 154, an organic bank (second partition layer) 156 made of an organic material is laminated to form a partition member in the organic EL device.

The organic EL element 152 is configured by stacking a hole transport layer 122 </ b> A and a light emitting layer 122 </ b> B on the pixel electrode 118, and forming a common electrode 120 that covers the light emitting layer 122 </ b> B and the organic bank 156. That is, the organic EL element 152 according to this example corresponds to the light-emitting element 14 according to the previous embodiment, and the pixel electrode 118, the hole transport layer 122A, the light-emitting layer 122B, and the common electrode 120 are respectively The constituent elements correspond to the anode 40, the hole transport layer 42, the light emitting layer 44, and the cathode 46 of the light emitting element 14.
The hole transport layer 122 </ b> A is formed so as to cover the surface of the pixel electrode 118, and the peripheral edge thereof is the edge of the inorganic bank 154 extending from the lower end side of the organic bank 156 to the center side of the pixel electrode 118. Covering.

  On the common electrode 120, an interlayer insulating layer 170 corresponding to the interlayer insulating layer 22 of the previous embodiment is formed, and an adsorbent 24 is formed so as to cover the interlayer insulating layer 170.

  Similar to the organic EL device 10 according to the previous embodiment, the organic EL display device 100 having the above configuration includes the adsorbent 24 and the first and second sealing members 26 and 28. It is said that. Thereby, a good sealing performance for the organic EL element 152 is realized by the double sealing structure of the first sealing member 26 and the second sealing member 28, and a high sealing performance can be obtained even in a narrow frame. An organic EL display device that is small and has a long life can be provided.

(Optical writing head)
Next, as another embodiment, an optical writing head using an organic EL device will be described with reference to FIGS.
FIG. 12 is a plan configuration diagram of an organic EL device having a configuration suitable for the optical writing head application according to the present embodiment.

  As shown in FIG. 12, on the substrate 12 constituting the organic EL device 172, a light emitting element region 174 in which organic EL elements (not shown) are arrayed is provided in the longitudinal direction along the length direction of the substrate 12. A plurality of driving elements 176 are arranged along the light emitting element region 174. Although details are omitted, each organic EL element provided in the light emitting element region 174 is electrically connected to a connection wiring 178 extending from each driving element 176 and is driven by an electric signal supplied from the driving element 176. It has become so.

  The organic EL device 172 of this example also has a sealing structure similar to that of the organic EL device 10 of the previous embodiment. That is, a protective layer (not shown) is formed on the surface of the organic EL element provided in the light emitting element region 174, and the adsorbent 24 is formed so as to cover the light emitting element region 174, and the first sealing surrounding the adsorbent 24. A stop member 26 and a second sealing member 28 surrounding the first sealing member 26 are formed. The sealing substrate 16 is attached so as to cover the adsorbent 24, the first sealing member 26, and the second sealing member 28.

  Similar to the organic EL device 10 according to the previous embodiment, the organic EL device 172 having the above configuration is configured to include the adsorbent 24 and the first and second sealing members 26 and 28. ing. Thereby, the double sealing structure of the first sealing member 26 and the second sealing member 28 realizes a good sealing performance for the light emitting element region 174, and a high sealing performance can be obtained even in a narrow frame. An optical writing head that is small and has a long life can be provided.

  FIG. 13 is a diagram illustrating an example in which the above-described organic EL device 172 is applied to an optical writing head (printer head) of an electrophotographic printer. In FIG. 13, an optical system 190 is provided in the light emission direction (upward in the drawing) of the organic EL device 172, and a photosensitive drum (photosensitive member) 192 is provided above the optical system 190. The organic EL device 172 emits light to the optical system 190, and the light incident on the optical system 190 is collected by the optical system 190 and enters the photosensitive drum 192. In this example, good sealing performance for the light emitting element 14 can be realized, and the reliability of the entire electrophotographic printer can be improved.

(Electronics)
Next, an example of an electronic apparatus provided with the organic EL display device 100 of the above embodiment will be described.
FIG. 14 is a perspective view showing an example of a mobile phone according to the present embodiment. A mobile phone 200 shown in FIG. 14 includes a display unit 202 using the organic EL display device 100 of the above embodiment, a control unit 204 for controlling the display unit 202, an operation button unit 206, a receiver unit 208, And a transmitter section 210. Since the electronic device shown in FIG. 14 includes the organic EL display device 100 of the above-described embodiment, the double sealing structure of the first sealing member 26 and the second sealing member 28 prevents the organic EL element. Good sealing performance is achieved, high sealing performance can be obtained even with a narrow frame, and a small and long-life electronic device can be provided. The electronic device to which the light emitting device according to this embodiment is applied is not limited to a mobile phone. For example, you may utilize the light-emitting device which concerns on each Example as a display device in various electronic devices. Such electronic devices include personal computers, personal digital assistants (PDAs), digital still cameras, televisions, video cameras, car navigation devices, pagers, electronic notebooks, electronic paper, calculators, word processors, workstations. Video phones, POS terminals, printers, scanners, copiers, video players, devices equipped with touch panels, and the like.

The plane block diagram and cross-sectional block diagram of the organic electroluminescent apparatus which concern on 1st Embodiment. 1 is a partially enlarged cross-sectional configuration diagram of an organic EL device according to a first embodiment. Sectional process drawing for demonstrating the manufacturing process of the organic electroluminescent apparatus which concerns on 1st Embodiment. The plane process drawing and sectional process drawing for demonstrating the manufacturing process of the organic electroluminescent apparatus which concerns on 1st Embodiment. The plane process drawing and sectional process drawing for demonstrating the manufacturing process of the organic electroluminescent apparatus which concerns on 1st Embodiment. The plane process drawing and sectional process drawing for demonstrating the manufacturing process of the organic electroluminescent apparatus which concerns on 1st Embodiment. FIG. 6 is a partially enlarged cross-sectional configuration diagram of an organic EL device according to a second embodiment. The circuit block diagram of the organic electroluminescence display which concerns on a present Example. 1 is a plan configuration diagram of an organic EL display device according to an embodiment. FIG. 1 is a plan configuration diagram showing one pixel region of an organic EL display device according to an embodiment. 1 is a cross-sectional configuration diagram of one pixel region of an organic EL display device according to an embodiment. 1 is a plan configuration diagram of an organic EL device for an optical writing head according to an embodiment. FIG. 1 is a schematic configuration diagram of an optical writing head according to an embodiment. FIG. 11 is a perspective configuration diagram illustrating an example of an electronic apparatus according to the embodiment. The cross-sectional block diagram which expanded the conventional organic electroluminescent apparatus partially.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Organic EL apparatus (light-emitting device) 12 ... Board | substrate 14 ... Light emitting element (laminated body) 16 ... Sealing board | substrate 18 ... Switching element (thin film transistor) 20 ... Wiring 22 ... Interlayer insulating layer 24 ... Adsorbent 26 ... First sealing Stop member 28 ... second sealing member 30 ... display region 32 ... frame region 34 ... multilayer wiring region 36 ... switching element region 38 ... seal region 40 ... anode 42 ... hole transport layer 44 ... light emitting layer 46 ... cathode 48 ... Gap 50 ... Particulate matter 52 ... Filler 54 ... Organic EL device (light emitting device) 56 ... First particulate matter 58 ... Second particulate matter 100 ... Organic EL display device 102 ... Pixel 104 ... Scanning line 106 ... Signal line 108 ... Common power supply line (power supply line) 110... Data side driving circuit 112... Scanning side driving circuit 116... Driving TFT 118. Electrode 122: Light emitting portion (organic functional layer) 122A ... Hole transport layer 122B ... Light emitting layer 138 ... Semiconductor layer 140 ... Relay electrode 142 ... Semiconductor layer 144A ... Source region 144B ... Drain region 144C ... Channel region 144G ... Gate electrode 146 ... Source electrode 148 ... Drain electrode 150 ... Electrode 152 ... Organic EL element 154 ... Inorganic bank (first partition layer) 156 ... Organic bank (second partition layer) 158 ... Opening 160 ... Gate insulating film 162 ... First Interlayer insulating films 164, 166 ... contact hole 168 ... second interlayer insulating film 170 ... interlayer insulating layer 172 ... organic EL device 174 ... light emitting element region 176 ... drive element 178 ... connection wiring 190 ... optical system 192 ... photosensitive drum (photosensitive) Body) 200 ... mobile phone 202 ... display unit 204 ... control Part 206 ... operation button section 208 ... the reception section 210 ... transmitter section.

Claims (2)

A light emitting device including at least a light emitting layer;
A switching element for driving the light emitting element;
Laminated wiring connecting at least the light emitting element and the switching element;
A substrate on which the light emitting element, the switching element and the laminated wiring are disposed;
A sealing substrate disposed on the substrate via a plurality of sealing members and covering the light emitting element;
Including
The plurality of sealing members include first and second sealing members,
The first sealing member surrounds an outer periphery of the light emitting element, and is over an arrangement surface of at least a part of each arrangement surface on which the light emitting element, the switching element, and the stacked wiring are arranged. Arranged to wrap,
The second sealing member surrounds an outer periphery of the first sealing member ;
The first sealing member includes a first granular material,
The second sealing member includes a second granular material,
The volume of the first granular material is smaller than the volume of the second granular material . A light emitting device according to claim 1 ;
A control unit for controlling the light emitting device;
An electronic device comprising:

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