JP2005135808A - Organic el display device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a number of components, manufacturing cost, and a number of manufacturing steps, for achieving high throughput with a low cost, by eliminating necessity of a dehumidifying material to be mounted, and increasing adsorptivity of chemical species (gas component). <P>SOLUTION: The organic EL display comprises a translucent glass substrate SUB1, an organic electroluminescent device ELD formed on the translucent glass substrate 1, a sealing glass substrate SUB2 arranged as opposed to the translucent glass substrate SUB1 with a gap for air-sealing the organic electroluminescent device ELD, and an adsorbent layer ADL formed on an inside surface of the sealing glass substrate SUB2 opposing to the organic electroluminescent device ELD. The adsorbent layer ADL includes an SiO porous layer ADL1 and a diatomaceous earth(or silicic acid earth) ADL2 evenly dispersed in a recess of the SiO porous layer ADL1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an organic display device using an organic light emitting element and a method for manufacturing the same, and more particularly, to an organic display having an adsorbing layer having hygroscopic and deacidifying functions on the inner surface of a sealing substrate that shields the organic light emitting element from an external atmosphere. The present invention relates to an EL display device and a manufacturing method thereof.

  As a current-controlled light-emitting device used for a display device, a device using electroluminescence (EL) or an injection-type light-emitting diode is known. Among them, a current control type EL (charge injection type EL, hereinafter also referred to as an organic light emitting element or organic EL) using an organic fluorescent material as a light emitting layer has a high luminance, a large area, a low manufacturing cost and a full color display. It is attracting attention as a possible display device.

  FIG. 3 is an enlarged cross-sectional view of a main part for schematically explaining one structural example of the organic light emitting device. This organic light emitting device ELD includes an anode AD formed of a transparent conductive film (thin film) such as ITO on a translucent glass substrate SUB, and a hole transport layer HTL made of a thin film of an organic material and light emission on the anode AD. The layer LUL and the cathode KD serving as the light emission control electrode are sequentially stacked.

  In the organic light emitting device ELD configured as described above, the light emitting layer LUL emits light by transferring holes from the hole transport layer HTL to the light emitting layer LUL by applying a predetermined voltage between the cathode KD and the anode AD. Then, the emitted light L is emitted from the substrate SUB.

  FIG. 4 is an enlarged cross-sectional view of a main part for schematically explaining another structural example of the organic light emitting device. This organic light emitting device ELD includes an anode AD formed of a transparent conductive film (thin film) such as ITO on a transparent glass substrate SUB similar to the above, and hole injection made of a thin film of an organic material on the anode AD. The layer HTL, the light emitting layer LUL, the electron injection layer EIL, and the cathode KD serving as the light emission control electrode are sequentially stacked.

  The organic light emitting device ELD configured as described above transfers holes from the hole injection layer HTL to the light emitting layer LUL by applying a predetermined voltage between the cathode KD and the anode AD, and the electron injection layer EIL. The light-emitting layer LUL emits light with electrons injected from the light, and the emitted light L is emitted from the translucent substrate SUB.

  In the organic light emitting device ELD having these laminated structures, a hole injection layer HTL is provided on the anode AD side for injecting holes in order to improve luminous efficiency, or an electron injection layer EIL is provided on the cathode KD side for injecting electrons. The structure which provides is taken.

  FIG. 5 is a cross-sectional view of an essential part for schematically explaining a conventional structural example of an organic EL display device using this type of organic light emitting element ELD. In FIG. 5, only one pixel is shown for the sake of simplicity, and a switching element for selecting the pixel, a control element for controlling light emission luminance, and the like are omitted. As shown in FIG. 5, an organic EL display device using the organic light emitting element ELD includes a translucent glass substrate SUB1 having the organic light emitting element ELD formed on the main surface, and a sealing glass for protecting the organic light emitting element ELD. The substrate SUB2 is made to face, the sealing material SEA is applied to the peripheral portions of both substrates, cured, and bonded together to isolate the inside from the outside and seal.

In addition, a dehumidifying material DES for mainly controlling the deterioration of the organic light emitting element ELD due to humidity may be attached to the inner surface of the sealing glass substrate SUB2 (the surface facing the main surface of the translucent glass substrate SUB1). It is common. The dehumidifying material DES is installed by processing the concave portion ALC on the inner surface of the sealing glass substrate SUB2 and attaching the dehumidifying material DES to the bottom surface of the concave portion ALC. With respect to this type of prior art, for example, the following Patent Document 1 can be cited.
JP 2001-345175 A

  In the organic EL display device configured as described above, when the organic light emitting element is manufactured, the light emitting member of the organic light emitting element ELD deteriorates due to moisture in the air or other gas components such as oxygen. In general, a dehumidifying material (desiccant) is mounted for the purpose of dehumidifying the inside of the ELD.

  Therefore, in this type of organic EL display device, the thickness of the dehumidifying material DES and the thickness of the adhesive CEM are considered as shown in the cross-sectional view of FIG. 5, and the depth in the thickness direction is formed on the inner surface of the sealing glass substrate SUB2. It is necessary to process the recess ALC with D of about 0.5 mm or more. In practice, processing with a depth of about 0.8 mm is required in consideration of variations in the coating thickness of the adhesive CEM and deformation of the dehumidifying material DES. For this reason, the thickness of the organic EL display device needs to have a thickness of the translucent glass substrate SUB1 + the thickness of the sealing glass substrate SUB2 = 2.5 mm.

  However, in this type of organic EL display device, since it is indispensable to mount the dehumidifying material DES on the inner surface side of the sealing glass SUB2, the inner surface of the sealing glass substrate SUB2 resulting from the mounting of the dehumidifying material DES. Due to the necessity of forming the recess ALC on the side, the processing cost increases, the number of parts such as the dehumidifying material DES and the adhesive SEA, and the number of manufacturing processes increase. There was a problem that productivity could not be obtained.

  In addition, since the thickness of the organic EL display device main body is increased by securing the recess ALC in which the dehumidifying material DES is mounted on the inner surface of the sealing glass substrate SUB2, the thickness of the organic EL display device is increased and the thickness is reduced. There was a problem that could not be achieved.

  Furthermore, the current dehumidifying material is formed by dispersing a desiccant such as barium oxide in a polymer resin material made of, for example, ethylene / vinyl acetate copolymer as an adhesive resin material. Although dehumidification in the glass substrate SUB2 is possible, removal of chemical species (gas) or the like (adsorption fixation) is impossible, and thus there is a problem that a sufficient gas component adsorption function cannot be obtained.

  Therefore, the present invention has been made to solve the above-described conventional problems, and its purpose is to integrally form an adsorbent on the inner surface of the sealing glass substrate, thereby reducing the thickness of the sealing glass substrate. An object of the present invention is to provide an organic EL display device that can be thinned and, by extension, capable of realizing a thin organic EL display device body, and a method for manufacturing the same.

  Another object of the present invention is to integrally form an adsorbent on the inner surface of the sealing glass substrate, thereby eliminating the need for a dehumidifying material and improving the adsorptivity of chemical species (gas components). An object of the present invention is to provide an organic EL display device that can reduce the number of parts, the processing cost, and the number of manufacturing steps, and that can realize high productivity at a low cost, and a manufacturing method thereof.

  In order to achieve such an object, an organic EL display device according to the present invention has a light-transmitting substrate, an organic light-emitting element formed on the light-transmitting substrate, and a light-transmitting substrate with a gap therebetween. And a sealing substrate that hermetically seals the organic light emitting element, and an adsorption layer disposed on the inner surface of the sealing substrate facing the organic light emitting element, the adsorption layer comprising a SiO porous layer, By comprising diatomaceous earth held and fixed in the gaps in this SiO porous layer, the surface is formed with a porous thin film, the surface area is increased, and humidity and chemical species are efficiently adsorbed and fixed. This facilitates the problem of the background art.

  In addition, another organic EL display device according to the present invention includes a translucent substrate, an organic light emitting element formed on the translucent substrate, and a transparent substrate disposed with a gap therebetween. A sealing substrate for hermetically sealing the light emitting element and an adsorption layer formed on the inner surface of the sealing substrate facing the organic light emitting element are provided. The adsorption layer includes a metal alkoxide laminating layer and a metal alkoxide laminating layer. Because the surface is formed of a porous thin film, the surface area is increased, and humidity and chemical species are easily adsorbed and fixed easily. The problem is solved.

In addition, the method of manufacturing an organic EL display device according to the present invention includes a translucent substrate, an organic light emitting element formed on the translucent substrate, a translucent substrate disposed with a gap therebetween, and In a method for manufacturing an organic EL display device, comprising: a sealing substrate for hermetically sealing an organic light emitting element; and an adsorption layer formed on an inner surface of the sealing substrate facing the organic light emitting element. A step of forming an organic light-emitting element having a light-emitting layer made of at least an organic material; a light-transmitting substrate on which the organic light-emitting element is formed; and a sealing substrate on which an adsorption layer is formed. A sealing step of hermetically sealing the two substrates so as to face each other, and SiO ₂ is formed on the inner surface of the sealing substrate between the step of forming the organic light emitting element and the step of hermetically sealing the two substrates. The SiO porous layer is formed by oblique vapor deposition. By including an adsorption layer forming step of adhering by dispersing the diatomaceous earth in the gap of the inner, the surface is a thin film-like adsorption layer made porous is formed, drawbacks of the related art is solved.

In addition, another method for manufacturing an organic EL display device according to the present invention includes a translucent substrate, an organic light emitting element formed on the translucent substrate, and a translucent substrate facing each other with a gap. In the method for manufacturing an organic EL display device comprising: a sealing substrate for hermetically sealing the organic light emitting element; and an adsorption layer formed on an inner surface of the sealing substrate facing the organic light emitting element. A step of forming an organic light-emitting element having a light-emitting layer made of at least an organic material thereon, a light-transmitting substrate on which the organic light-emitting element is formed, and a sealing substrate on which an adsorption layer is formed include the organic light-emitting element and the adsorption layer And a sealing step for hermetically sealing the two substrates so as to face each other, and a metal is formed on the inner surface of the sealing substrate between the step of forming the organic light emitting element and the step of hermetically sealing the two substrates. Apply alkoxide and dry to stack metal alkoxide flakes By forming and forming an adsorption layer forming step in which diatomaceous earth is dispersed and adhered to the gaps in the metal alkoxide flake stack, a thin-film adsorption layer whose surface is made porous is formed, and the background art is solved. The
Moreover, in the organic EL display device and the manufacturing method thereof according to the present invention described above, silicate earth may be used instead of diatomaceous earth, or a mixture of diatomaceous earth and silicate earth may be used.

  It should be noted that the present invention is not limited to the above-described configurations and the configurations described in the embodiments described later, and it goes without saying that various modifications can be made without departing from the technical idea of the present invention. .

  According to the organic EL display device of the present invention, an adsorption layer having a porous surface and an increased surface area is formed, so that moisture, gas components, and the like are easily adsorbed in the air. Then, it is possible to easily and reliably adsorb and remove chemical species (gas) that have been difficult to remove. In addition, by forming the adsorbent integrally on the inner surface of the sealing substrate, the thickness of the sealing substrate can be reduced, and the organic EL display device can be made thinner. Is obtained.

  Further, according to the method of manufacturing the organic EL display device according to the present invention, the adsorption layer can be formed integrally with the inner surface of the sealing substrate, so that the processing cost of the recess for mounting the dehumidifying material on the sealing substrate and Since parts such as a dehumidifying material and an adhesive and a manufacturing process thereof are not necessary, the cost can be reduced, and an extremely excellent effect such as providing an organic EL display device with low cost and high productivity can be obtained.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings of the examples.

  FIGS. 1A, 1B, and 1C are cross-sectional views schematically illustrating a configuration of an organic EL display device according to an embodiment of the present invention. FIG. Therefore, only one pixel is shown. Also, the same parts as those in the above-mentioned drawings are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 1 (a), an organic EL display device ELDD includes a light-transmitting glass substrate SUB1 and a sealing glass substrate SUB2 having a recessed portion ALC processed on the opposite surface, and a transparent glass substrate SUB1 arranged in parallel with each other. An organic light emitting device ELD in which an anode AD, a hole transport layer HTL, a light emitting layer LUL, an electron injection layer EIL, and a cathode KD are sequentially laminated on the optical glass substrate SUB1, for example, as shown in FIG. A seal that adheres and fixes the outermost peripheries of both substrates so as to surround the periphery of the organic light emitting device ELD, with the adsorbed layer ADL dispersed and adhered to the porous SiO layer and diatomaceous earth deposited in the recess ALC of the substrate SUB2 It is comprised from material SEA.

In the organic EL display device configured as described above, the adsorption layer ADL formed on the inner surface of the recess ALC of the sealing glass substrate SUB2 is the sealing glass substrate as shown in the enlarged cross-sectional view of the main part in FIG. becomes a SiO ₂ to SUB2 bottom surface of the recess ALC from SiO deposited film formed by oblique evaporation method, the surface porous layer ADL1 made porous is formed integrally with, the surface roughening Has been formed. Further, in this roughened SiO porous layer ADL1, diatomaceous earth (pumice) ADL2 pulverized into a fine powder is uniformly dispersed and adhered as shown in the enlarged sectional view of the main part in FIG. The SiO porous layer ADL1 is physically adsorbed and held and fixed in the gap. In addition, the layer thickness of this adsorption layer ADL is formed in the range of 0.5 micrometer-5 micrometers.

  Since this adsorption layer ADL is formed with a layer thickness in the range of 0.5 μm to 5 μm necessary for obtaining sufficient functions as a dehumidifying and degassing structure, the processing depth of the recess ALC of the sealing glass substrate SUB2 It is sufficient that the thickness D is 10 μm (0.01 mm) or less. For this reason, an element thickness of about 0.8 mm (processing amount) or more can be reduced as compared with the current state.

  In such a configuration, the adsorption layer ADL formed of the porous SiO vapor deposition layer ADL1 and the diatomaceous earth ADL2 in the recess ALC of the sealing glass substrate SUB2 is integrally formed, so that the adsorption layer ADL has a surface area. Since it greatly increases and shows reversible moisture and chemical species (gas) component adsorption properties, the moisture and gas components in the air that were difficult to remove with the current dehumidifiers are physically adsorbed and fixed. Removal is extremely easy.

  Further, in such a configuration, the adsorption layer ADL can be integrally formed in the recess ALC of the sealing glass substrate SUB2 with a thickness in the range of 0.5 μm to 5 μm, and in addition, sufficient humidity and gas components As a result, it is possible to reduce the thickness of the sealing glass substrate SUB2 and the depth of the processed portion of the recess ALC, and further reduce the element thickness, thereby reducing the thickness of the organic EL display device. Can be realized.

  In the above-described embodiment, the case where the porous layer ADL1 constituting the adsorption layer ADL is formed of an oblique vapor deposition film has been described. However, the present invention is not limited to this, and the inner surface of the recess ALC is formed. Even if the entire surface is formed of a solid vapor-deposited film, the surface becomes porous, and diatomaceous earth ADL2 is sufficiently dispersed, adhered, and held and fixed, so that the same effect as described above can be obtained. The same effect can be obtained by replacing diatomaceous earth ADL2 with silicate earth (for example, zeolite) or a mixture of diatomaceous earth ADL2 and silicate earth.

  In the above-described embodiment, the case where SiO is used as the metal forming the porous layer ADL1 constituting the adsorption layer ADL has been described. However, the present invention is not limited to this, and SiN, TiN, and the like are used. Even if used, the same effect as described above can be obtained.

  Next, an embodiment of the method for manufacturing the organic EL display device described in the first embodiment will be described with reference to FIGS. 1 (a), (b), and (c). In addition, the formation process of the organic light emitting element ELD formed on the translucent glass substrate SUB1 is omitted. As shown in FIG. 1A, first, a translucent glass substrate SUB1 on which an organic light emitting element ELD is formed is prepared.

Next, the sealing glass substrate SUB2 in which the concave portion ALC is formed in the main portion is sufficiently washed and dried, and then SiO ₂ is formed on the bottom surface of the concave portion ALC by the oblique deposition method. ), An SiO porous layer ADL1 having a porous surface is integrally formed as shown in the enlarged sectional view of the main part. Subsequently, diatomaceous earth (pumice) ADL2 pulverized into a fine powder as shown in an enlarged cross-sectional view in FIG. 1C is uniformly dispersed and adhered to the gap in the SiO porous layer ADL1, and the SiO deposited layer ADL1 is adhered. An adsorption layer ADL that is physically adsorbed and held and fixed in the inner gap is formed. Instead of diatomaceous earth ADL2, silicate earth (for example, zeolite) or a mixture of diatomaceous earth ADL2 and silicate earth may be used. In any case, the adsorption layer ADL is formed with a thickness in the range of 0.5 μm to 5 μm.

  In the case where the SiO porous layer ADL1 is formed on the inner surface of the sealing glass substrate SUB2, the SiO porous layer ADL1 is bonded to the translucent glass substrate SUB1 and the sealing glass substrate SUB2 and sealed in a later step. Is present in the application area of the sealing material SEA, the sealing ability and adhesion ability are hindered. Therefore, measures such as masking treatment should be taken so that the SiO porous layer ADL1 is not formed on the outer peripheral portion of the sealing glass substrate SUB2. It is necessary to apply.

  Next, after sufficient vacuum or heat dehydration treatment is performed on the sealing glass substrate SUB2 on which the adsorption layer ADL is formed, epoxy is applied to the outer peripheral portion (opening end of the recess ALC) of the sealing glass substrate SUB2 on which the adsorption layer ADL is formed. A light-transmitting glass substrate SUB1 on which an organic light-emitting element ELD is formed by applying a sealing material SEA such as resin with a dispenser or the like, and a sealing glass substrate SUB2 on which an adsorption layer ADL is formed are combined with the organic light-emitting element ELD and the adsorption layer ADL. Are stacked so as to face each other with a predetermined interval, and the sealing material SEA is cured and sealed to complete the organic EL display device ELDD. This curing process may be thermal curing or ultraviolet curing depending on the curing component added to the sealing material SEA.

  These sealing steps are performed in an inert gas atmosphere such as dry nitrogen in which the humidity and gas components in the air are controlled, and the humidity and gas component amounts contained in the internal space of the organic EL display device ELDD are below a predetermined value. Is controlling.

  According to such a method, since the adsorption layer ADL can be easily formed by integrating with the bottom surface of the recess ALC of the sealing glass substrate SUB2, the processing cost and the dehumidification material of the recess for mounting the dehumidifying material on the sealing glass substrate SUB2 , Parts such as adhesives and manufacturing processes thereof are not required, so that the yield is improved, the cost can be reduced, and an organic EL display device ELDD with low cost and high productivity can be realized.

  2 (a), 2 (b), and 2 (c) are cross-sectional views of relevant parts for schematically explaining the configuration of another embodiment of the organic EL display device according to the present invention, and FIG. For simplicity, only one pixel is shown. Also, the same parts as those in the above-mentioned drawings are denoted by the same reference numerals, and the description thereof is omitted. 2A is different from FIG. 1 in that an organic EL display device ELDD is composed of a translucent glass substrate SUB1 and a flat sealing glass substrate SUB2 which are arranged to face each other in parallel. ing.

  Further, on the inner surface of the sealing glass substrate SUB2 facing the organic light emitting element ELD, there is a metal alkoxide flake laminate ADL3 and a diatomaceous earth ADL2 that is uniformly dispersed and bonded and held and fixed in a gap in the metal alkoxide flake laminate ADL3. An adsorption layer ADL ′ composed of is formed.

This metal alkoxide laminar laminate ADL3 is coated with a metal alkoxide containing SiO ₂ as one of the main components on the inner surface of the sealing glass substrate SUB2, as shown in FIG. The metal alkoxide laminar laminate ADL3 is integrally formed, and the surface thereof is roughened. Further, diatomaceous earth (pumice) ADL2 pulverized into a fine powder is uniformly dispersed and bonded to the gap in the metal alkoxide laminar laminate ADL3 as shown in the enlarged cross-sectional view of the main part in FIG. It is formed by being physically adsorbed and held and fixed in the gaps in the laminar laminate ADL3. The diatomaceous earth ADL2 may be replaced with silicate earth (for example, zeolite) or a mixture of diatomaceous earth ADL2 and silicate earth, and in any case, this adsorption layer ADL ′ sufficiently obtains a function as a dehumidifying and degassing structure. It is formed with a layer thickness in the range of 0.5 μm to 5 μm required for the above.

  In addition, the sealing glass substrate SUB2 on which the adsorption layer ADL ′ is formed is an organic light emitting device by making the adsorption layer ADL ′ and the organic light emitting element ELD face each other on the translucent glass substrate SUB1 on which the organic light emitting element ELD is formed. The element ELD is bonded and fixed by a sealing material SEA in which spacers SP are dispersed on the outermost periphery of both substrates so as to surround the periphery of the element ELD.

  Also in the organic EL display device configured in this way, from the inner surface of the sealing glass substrate SUB2, the metal alkoxide flake laminate ADL3 and diatomaceous earth (or its substitute) ADL2 held and fixed in the gap between the metal alkoxide flake laminate ADL3 Since the adsorbing layer ADL ′ is integrally formed, the adsorbing layer ADL ′ has a surface area greatly increased as described above, and exhibits reversible moisture and chemical (gas) component adsorption. In addition, it is possible to physically adsorb and fix a gas component that has been difficult to remove with the humidity in the air and the current dehumidifying material, and the removal thereof becomes extremely easy.

  In such a configuration, the adsorption layer ADL ′ formed on the sealing glass substrate SUB2 has a thickness of about 10 μm or less, and a seal that bonds and fixes the sealing glass substrate SUB2 to the translucent glass substrate SUB1. Since the particle diameter D of the spacer SP mixed in the material SEA is about 30 μm ± 5 μm, it is about three times the layer thickness of the adsorption layer ADL ′, so that a flat plate that does not process a recess in the sealing glass substrate SUB2 Fabrication using a glass substrate is possible.

  Even in such a configuration, the adsorption layer ADL ′ can be formed integrally with the inner surface of the sealing glass substrate SUB2 in the range of 0.5 μm to 5 μm, and in addition, sufficient humidity and gas components can be removed. Since the effect can be obtained, the processing of the concave portion is not necessary, and the thickness of the sealing glass substrate SUB2 can be reduced and the element thickness can be reduced. Accordingly, the organic EL display device can be reduced in thickness.

  Next, one embodiment of the method for manufacturing the organic EL display device described in the third embodiment will be described with reference to FIGS. 2 (a), (b), and (c). In addition, the same part of the formation process demonstrated in Example 2 mentioned above attaches | subjects the same code | symbol, and the overlapping description is abbreviate | omitted.

First, after sufficiently washing and drying the sealing glass substrate SUB2 formed in a flat plate shape, a metal alkoxide containing SiO ₂ as one of the main components is applied to the inner surface of the sealing glass substrate SUB2, After forming the metal alkoxide sol-gel film, the metal alkoxide laminar laminate ADL3 is integrally formed by laminating a large number of flake-like pieces as shown in the enlarged cross-sectional view of the main part in FIG. To do. In this case, the metal alkoxide flake layer ADL3 is formed by roughening the surface.

  In addition, when forming the metal alkoxide thin-layer laminate ADL3 on the inner surface of the sealing glass substrate SUB2, when the pasting and sealing the light-transmitting glass substrate SUB1 and the sealing glass substrate SUB2 in the subsequent step, the metal alkoxide thin-layer stack ADL3 is performed. Is present in the application area of the sealing material SEA, the sealing ability and adhesion ability are hindered. Therefore, measures such as masking treatment should be taken so that the metal alkoxide laminar laminate ADL3 is not formed on the outer peripheral portion of the sealing glass substrate SUB2. It is necessary to apply.

  Subsequently, diatomaceous earth ADL2 pulverized into a fine powder form is uniformly dispersed and adhered in the gap between the metal alkoxide laminar laminate layers ADL3 as shown in the enlarged cross-sectional view of the main part in FIG. The adsorbed layer ADL ′ is formed by being physically adsorbed and held in the gaps (gap between the flake-like pieces). Diatomaceous earth ADL2 may be replaced with silicate earth (eg, zeolite) or a mixture of diatomaceous earth ADL2 and siliceous earth, and in any case, this adsorbing layer ADL 'can sufficiently function as a dehumidifying and degassing structure. It is formed with a layer thickness in the range of 0.5 μm to 5 μm required for the above.

  Next, the sealing glass substrate SUB2 on which the adsorption layer ADL ′ is formed is subjected to sufficient vacuum or heat dehydration treatment, and then an epoxy in which the spacer SP is mixed into the outer peripheral portion of the sealing glass substrate SUB2 on which the adsorption layer ADL ′ is formed. A sealing material SEA such as resin is applied with a dispenser or the like, and a light-transmitting glass substrate SUB1 on which an organic light-emitting element ELD is prepared in advance and a sealing glass substrate SUB2 on which an adsorption layer ADL is formed are combined with the organic light-emitting element ELD. And the adsorbing layer ADL are opposed to each other with a predetermined interval, and the sealing material SEA is cured and sealed to complete the organic EL display device ELDD. In this case as well, the curing treatment may be heat curing or ultraviolet curing depending on the curing component added to the sealing material SEA.

  These sealing steps are performed in an inert gas atmosphere such as dry nitrogen in which the humidity and gas components in the air are controlled, and the humidity and gas component amounts contained in the internal space of the organic EL display device ELDD are below a predetermined value. Is controlling.

  Even in such a method, since the adsorption layer ADL ′ can be easily formed by being integrated with the inner surface of the sealing glass substrate SUB2, the processing cost and the dehumidifying material, bonding of the recess for mounting the dehumidifying material on the sealing glass substrate SUB2 Since parts such as the agent and the manufacturing process thereof are completely unnecessary, the yield is improved, the cost can be reduced, and the organic EL display device ELDD with low cost and high productivity can be realized.

  In the above-described embodiment, the case where the organic EL display device is applied to a polymer organic EL display device that does not require a vacuum sensitive to moisture and gas components in the air has been described. However, the present invention is not limited thereto. However, the same effects as described above can be obtained even when applied to a low-molecular organic EL display device. Of course, the techniques of the above-described embodiments can be applied to the inner wall of a storage case such as a refrigerator.

It is principal part sectional drawing which illustrates typically the structure by one Example of the organic electroluminescent display apparatus by this invention. It is a principal part cross section which illustrates typically the structure by the other Example of the organic electroluminescent display apparatus by this invention. It is sectional drawing which illustrates typically the example of 1 structure of an organic EL display element. It is sectional drawing which illustrates the other structural example of an organic electroluminescent display element typically. It is principal part sectional drawing which shows the structure of the conventional organic electroluminescence display.

Explanation of symbols

SUB1 ... translucent glass substrate, SUB2 ... sealing glass substrate, ELD ... organic light emitting element, SEA ... sealing material, ELDD ... organic EL display device, ADL ... adsorption layer, ADL '... adsorption layer, ADL1 ... SiO porous layer, ADL2 ... diatomaceous earth, ADL3 ... metal alkoxide flake stack, SP ... spacer.

Claims (4)

A translucent substrate;
An organic light emitting device formed on the translucent substrate;
A sealing substrate disposed opposite to the light-transmitting substrate with a gap and hermetically sealing the organic light-emitting element;
An adsorption layer formed on the inner surface of the sealing substrate facing the organic light emitting element;
With
The organic EL display device, wherein the adsorption layer is composed of a SiO porous layer and diatomaceous earth or silicate earth held and fixed in a gap in the SiO porous layer. A translucent substrate;
An organic light emitting device formed on the translucent substrate;
A sealing substrate disposed opposite to the light-transmitting substrate with a gap and hermetically sealing the organic light-emitting element;
An adsorption layer formed on the inner surface of the sealing substrate facing the organic light emitting element;
With
2. The organic EL display device according to claim 1, wherein the adsorption layer is made of a metal alkoxide flake stack and diatomaceous earth or silicate earth held and fixed in a gap in the metal alkoxide flake stack. A translucent substrate;
An organic light emitting device formed on the translucent substrate;
A sealing substrate disposed opposite to the light-transmitting substrate with a gap and hermetically sealing the organic light-emitting element;
An adsorption layer formed on the inner surface of the sealing substrate facing the organic light emitting element;
In a manufacturing method of an organic EL display device comprising:
Forming an organic light emitting element having a light emitting layer made of at least an organic material on the translucent substrate;
A sealing step of hermetically sealing the transparent substrate on which the organic light emitting element is formed and the sealing substrate on which the adsorption layer is formed so that the organic light emitting element and the adsorption layer are disposed to face each other. When,
Have
Between the step of forming the organic light emitting element and the step of hermetically sealing the two substrates, SiO ₂ is obliquely deposited on the inner surface of the sealing substrate to form a SiO porous layer, and the SiO porous layer A method for producing an organic EL display device, comprising an adsorption layer forming step of dispersing and adhering diatomaceous earth or silicate earth in a gap in a layer. A translucent substrate;
An organic light emitting device formed on the translucent substrate;
A sealing substrate disposed opposite to the light-transmitting substrate with a gap and hermetically sealing the organic light-emitting element;
An adsorption layer formed on the inner surface of the sealing substrate facing the organic light emitting element;
In a manufacturing method of an organic EL display device comprising:
Forming an organic light emitting element having a light emitting layer made of at least an organic material on the translucent substrate;
A sealing step of hermetically sealing the transparent substrate on which the organic light emitting element is formed and the sealing substrate on which the adsorption layer is formed so that the organic light emitting element and the adsorption layer are opposed to each other; ,
Have
Between the step of forming the organic light emitting element and the step of hermetically sealing the two substrates, a metal alkoxide is applied to the inner surface of the sealing substrate and dried to form a metal alkoxide flake stack, and the metal alkoxide A method for producing an organic EL display device, comprising an adsorption layer forming step of dispersing and adhering diatomaceous earth or silicate earth in a gap in a laminar stack.

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