WO2016088350A1 - Organic el display device - Google Patents

Abstract

The present invention is provided with the following: an element substrate 30a on which an organic EL element 20a is arranged; a sealing substrate 40a disposed so as to face the side of the element substrate 30a on which the organic EL element 20a is disposed; a seal material that is provided between the element substrate 30a and the sealing substrate 40a in a frame shape so as to enclose the organic EL element 20; and a filler material 46a made of a curable resin and disposed in the area enclosed by the seal material that is between the element substrate 30a and the sealing substrate 40a. The sealing substrate 40a is provided with a structure 31a that engages with the surface shape of the element substrate 30a.

Description

Organic EL display device

The present invention relates to an organic EL display device.

In recent years, a self-luminous organic EL display device using an organic EL (electroluminescence) element has attracted attention as a display device that replaces a liquid crystal display device.

For example, in Patent Document 1, one surface of a support substrate provided with an organic EL element is covered and sealed with a sealing substrate via an adhesive layer, and the organic EL element is surrounded on one surface of the support substrate. Thus, there is disclosed an organic EL panel in which a first partition is formed and a second partition is formed so as to surround an organic EL element on a surface of a sealing substrate facing one surface of a support substrate.

JP 2008-10233 A

By the way, in the organic EL display device, in order to protect the organic EL element from moisture, oxygen, and the like, the element substrate provided with the organic EL element and the sealing substrate are bonded together via a frame-shaped sealing material. There has been proposed a panel structure in which a region surrounded by a sealing material between a substrate and a sealing substrate is filled with a filler having a getter function for adsorbing moisture or oxygen. In this panel structure, the amount of shrinkage when the resin material constituting the filler filled between the element substrate and the sealing substrate is cured is attributed to the surface shape formed on the element substrate. Since it varies considerably depending on the upper position, local peeling may occur between the element substrate and the filler.

The present invention has been made in view of such points, and an object thereof is to suppress local peeling between the element substrate and the filler made of curable resin.

In order to achieve the above object, an organic EL display device according to the present invention includes an element substrate provided with an organic EL element, and a sealing provided so as to face the element substrate provided with the organic EL element. A sealing material provided in a frame shape so as to surround the organic EL element between the substrate and the element substrate and the sealing substrate, and a curing provided in a region surrounded by the sealing material between the element substrate and the sealing substrate The sealing substrate is provided with a structure that engages with the surface shape of the element substrate.

According to the present invention, since the structure that engages with the surface shape of the element substrate is provided on the sealing substrate, local peeling between the element substrate and the curable resin filler is suppressed. Can do.

1 is a plan view of an organic EL display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the organic EL display device taken along line II-II in FIG. FIG. 3 is a cross-sectional view of an end portion of the organic EL display device taken along line III-III in FIG. It is sectional drawing of the organic electroluminescent layer which comprises the organic electroluminescent display apparatus which concerns on the 1st Embodiment of this invention. It is a top view which shows the planar positional relationship of the edge cover which comprises the organic electroluminescence display which concerns on the 1st Embodiment of this invention, and the convex part of a structure. It is sectional drawing for demonstrating the manufacturing method of the organic electroluminescence display which concerns on the 1st Embodiment of this invention. It is another sectional view for explaining the manufacturing method of the organic EL display device according to the first embodiment of the present invention. It is sectional drawing for demonstrating the modification of the organic electroluminescence display which concerns on the 1st Embodiment of this invention. It is sectional drawing of the organic electroluminescence display which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the organic electroluminescence display which concerns on the 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

<< First Embodiment >>
1 to 8 show a first embodiment of an organic EL display device according to the present invention. Here, FIG. 1 is a plan view of the organic EL display device 50a of the present embodiment. FIG. 2 is a cross-sectional view of the organic EL display device 50a taken along line II-II in FIG. FIG. 3 is a cross-sectional view of the end portion of the organic EL display device 50a taken along line III-III in FIG. FIG. 4 is a cross-sectional view of the organic EL layer 16a constituting the organic EL display device 50a. FIG. 5 is a plan view showing a planar positional relationship between the edge cover 15a constituting the organic EL display device 50a and the convex portion C of the structure 31a.

As shown in FIGS. 1 to 3, the organic EL display device 50a is provided in a frame shape between the element substrate 30a and the sealing substrate 40a provided so as to face each other, and between the element substrate 30a and the sealing substrate 40a. And a curable resin-made filling material 46a provided in a region surrounded by the sealing material 45a between the element substrate 30a and the sealing substrate 40a. Here, in the organic EL display device 50a, a display region for displaying an image is defined in a rectangular shape inside the sealing material 45a, and a plurality of pixels are arranged in a matrix in the display region. In each pixel, for example, a sub-pixel for performing red gradation display, a sub-pixel for performing green gradation display, and a sub-pixel for performing blue gradation display are adjacent to each other. It is arranged.

As illustrated in FIG. 2, the element substrate 30a covers the insulating substrate 10a, the base film 11 provided on the insulating substrate 10a, the organic EL element 20a provided on the base film 11, and the organic EL element 20a. And a sealing film 21a provided as described above.

The insulating substrate 10a is, for example, a transparent flexible substrate such as a plastic substrate.

The base film 11 is, for example, an inorganic insulating film such as a silicon oxide film or a silicon nitride film.

As shown in FIG. 2, the organic EL element 20a includes a plurality of thin film transistors (TFTs) 12 provided for each sub-pixel, an interlayer insulating film 13, and a plurality of first electrodes provided in a matrix. 14, an edge cover 15 a, a plurality of organic EL layers 16 a provided in each subpixel, and a second electrode 17 a.

The TFT 12 is provided on the base film 11 as shown in FIG. Here, the TFT 12 includes, for example, a gate electrode provided on the base film 11, a gate insulating film provided so as to cover the gate electrode, and a semiconductor layer provided on the gate insulating film so as to overlap the gate electrode. And a source electrode and a drain electrode provided on the semiconductor layer so as to face each other. In the present embodiment, the bottom gate type TFT is exemplified, but the TFT 12 may be a top gate type TFT.

As shown in FIG. 2, the interlayer insulating film 13 is provided so as to cover a portion other than a part of the drain electrode of each TFT 12. Here, the interlayer insulation film 13 is comprised by transparent organic resin materials, such as an acrylic resin, for example.

As shown in FIG. 2, the first electrode 14 is provided on each interlayer pixel 13 on the interlayer insulating film 13. Further, as shown in FIG. 2, the first electrode 14 is connected to the drain electrode of each TFT 12 through a contact hole formed in the interlayer insulating film 13. The first electrode 14 has a function of injecting holes into the organic EL layer 16a. The first electrode 14 is more preferably formed of a material having a high work function in order to improve the efficiency of hole injection into the organic EL layer 16a. Here, as a material constituting the first electrode 14, for example, silver (Ag), aluminum (Al), vanadium (V), cobalt (Co), nickel (Ni), tungsten (W), gold (Au) , Calcium (Ca), titanium (Ti), yttrium (Y), sodium (Na), ruthenium (Ru), manganese (Mn), indium (In), magnesium (Mg), lithium (Li), ytterbium (Yb) And metal materials such as lithium fluoride (LiF). The material constituting the first electrode 14 is, for example, magnesium (Mg) / copper (Cu), magnesium (Mg) / silver (Ag), sodium (Na) / potassium (K), astatine (At) / oxidation. Astatine (AtO ₂ ), lithium (Li) / aluminum (Al), lithium (Li) / calcium (Ca) / aluminum (Al), lithium fluoride (LiF) / calcium (Ca) / aluminum (Al), etc. An alloy may be used. Further, the material constituting the first electrode 14 is, for example, a conductive oxide such as tin oxide (SnO), zinc oxide (ZnO), indium tin oxide (ITO), indium zinc oxide (IZO), or the like. There may be. The first electrode 14 may be formed by laminating a plurality of layers made of the above materials. Examples of the material having a large work function include indium tin oxide (ITO) and indium zinc oxide (IZO).

As shown in FIGS. 2 and 5, the edge cover 15 a is provided in a lattice shape so as to cover the peripheral edge portion of each first electrode 14. Here, as the material constituting the edge cover 15a, for example, silicon oxide (SiO ₂ ), silicon nitride such as trisilicon tetranitride (Si ₃ N ₄ ) (SiNx (x is a positive number)), silicon oxynite, etc. An inorganic film such as a ride (SiNO) or an organic film such as a polyimide resin, an acrylic resin, a polysiloxane resin, or a novolac resin can be used.

As shown in FIG. 4, the organic EL layer 16a is a laminate in which a hole injection layer 1, a hole transport layer 2, a light emitting layer 3, an electron transport layer 4 and an electron injection layer 5 are laminated in this order.

The hole injection layer 1 is also called an anode buffer layer, and has a function of improving the efficiency of hole injection from the first electrode 14 to the organic EL layer 16a by bringing the energy levels of the first electrode 14 and the organic EL layer 16a closer to each other. Have. Here, as a material constituting the hole injection layer 1, for example, a triazole derivative, an oxadiazole derivative, an imidazole derivative, a polyarylalkane derivative, a pyrazoline derivative, a phenylenediamine derivative, an oxazole derivative, a styrylanthracene derivative, a fluorenone derivative, Examples include hydrazone derivatives and stilbene derivatives.

The hole transport layer 2 has a function of improving the hole transport efficiency from the first electrode 14 to the organic EL layer 16a. Here, examples of the material constituting the hole transport layer 2 include porphyrin derivatives, aromatic tertiary amine compounds, styrylamine derivatives, polyvinylcarbazole, poly-p-phenylene vinylene, polysilane, triazole derivatives, oxadiazole. Derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amine-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, hydrogenated amorphous silicon, Examples include hydrogenated amorphous silicon carbide, zinc sulfide, and zinc selenide.

In the light emitting layer 3, when voltage is applied by the first electrode 14 and the second electrode 17a, holes and electrons are injected from the first electrode 14 and the second electrode 17a, respectively, and the holes and electrons are recombined. It is an area. Here, the light emitting layer 3 is formed of a material having high light emission efficiency. Examples of the material constituting the light emitting layer 3 include metal oxinoid compounds [8-hydroxyquinoline metal complexes], naphthalene derivatives, anthracene derivatives, diphenylethylene derivatives, vinylacetone derivatives, triphenylamine derivatives, butadiene derivatives, and coumarin derivatives. Benzoxazole derivatives, oxadiazole derivatives, oxazole derivatives, benzimidazole derivatives, thiadiazole derivatives, benzthiazole derivatives, styryl derivatives, styrylamine derivatives, bisstyrylbenzene derivatives, tristyrylbenzene derivatives, perylene derivatives, perinone derivatives, aminopyrene derivatives, Pyridine derivatives, rhodamine derivatives, acuidine derivatives, phenoxazone, quinacridone derivatives, rubrene, poly-p-phenylene vinyle , Polysilane, and the like.

The electron transport layer 4 has a function of efficiently moving electrons to the light emitting layer 3. Here, examples of the material constituting the electron transport layer 4 include organic compounds such as oxadiazole derivatives, triazole derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, tetracyanoanthraquinodimethane derivatives, diphenoquinone derivatives, and fluorenone derivatives. , Silole derivatives, metal oxinoid compounds and the like.

The electron injection layer 5 has a function of bringing the energy levels of the second electrode 17a and the organic EL layer 16a closer to each other, and improving the efficiency with which electrons are injected from the second electrode 17a to the organic EL layer 16a. The drive voltage of the organic EL element 20a can be lowered. The electron injection layer 5 is also called a cathode buffer layer. Here, as a material constituting the electron injection layer 5, for example, lithium fluoride (LiF), magnesium fluoride (MgF ₂ ), calcium fluoride (CaF ₂ ), strontium fluoride (SrF ₂ ), barium fluoride. Inorganic alkali compounds such as (BaF ₂ ), aluminum oxide (Al ₂ O ₃ ), strontium oxide (SrO), and the like can be given.

As shown in FIG. 2, the second electrode 17a is provided so as to cover each organic EL layer 16a and the edge cover 15a. The second electrode 17a has a function of injecting electrons into the organic EL layer 16a. The second electrode 17a is more preferably composed of a material having a small work function in order to improve the efficiency of electron injection into the organic EL layer 16a. Here, examples of the material constituting the second electrode 17a include silver (Ag), aluminum (Al), vanadium (V), cobalt (Co), nickel (Ni), tungsten (W), and gold (Au). , Calcium (Ca), titanium (Ti), yttrium (Y), sodium (Na), ruthenium (Ru), manganese (Mn), indium (In), magnesium (Mg), lithium (Li), ytterbium (Yb) And lithium fluoride (LiF). In addition, the second electrode 17a is, for example, magnesium (Mg) / copper (Cu), magnesium (Mg) / silver (Ag), sodium (Na) / potassium (K), astatine (At) / oxidized astatine (AtO _2). ), Lithium (Li) / aluminum (Al), lithium (Li) / calcium (Ca) / aluminum (Al), lithium fluoride (LiF) / calcium (Ca) / aluminum (Al), etc. May be. The second electrode 17a may be formed of a conductive oxide such as tin oxide (SnO), zinc oxide (ZnO), indium tin oxide (ITO), indium zinc oxide (IZO), and the like. . The second electrode 17a may be formed by laminating a plurality of layers made of the above materials. Examples of materials having a small work function include magnesium (Mg), lithium (Li), lithium fluoride (LiF), magnesium (Mg) / copper (Cu), magnesium (Mg) / silver (Ag), and sodium. (Na) / potassium (K), lithium (Li) / aluminum (Al), lithium (Li) / calcium (Ca) / aluminum (Al), lithium fluoride (LiF) / calcium (Ca) / aluminum (Al) Etc.

As shown in FIG. 2, the sealing film 21a is provided so as to cover the organic EL element 20a. The sealing film 21a has a function of protecting the organic EL element 20a from moisture and oxygen. Here, as a material constituting the sealing film 21a, for example, silicon nitride (SiNx (Si ₂ N ₃ ) such as silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), or trisilicon tetranitride (Si ₃ N ₄ ). x is a positive number)), inorganic materials such as silicon carbonitride (SiCN), and organic materials such as acrylate, polyurea, parylene, polyimide, and polyamide.

In the element substrate 30a configured as described above, the space between the lattices of the edge cover 15a is formed in a concave shape as shown in FIG. The size of the concave space B is, for example, about 250 μm long × 50 μm wide × 1 μm deep.

As shown in FIG. 2, the sealing substrate 40a includes an insulating substrate 10b and a structure 31a provided on the insulating substrate 10b.

The insulating substrate 10b is a transparent flexible substrate such as a plastic substrate.

The structure 31a is provided so as to engage with the surface shape of the element substrate 30a, that is, the surface unevenness A. Here, the structure 31a includes a plurality of convex portions C provided in a matrix. And each convex part C of the structure 31a is provided so that it may fit in each concave space B formed in the element substrate 30a while overlapping with the organic EL layer 16a, as shown in FIG. In addition, as a material constituting the structure 31a, for example, silicon nitride (SiNx (x is x3)) such as silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), or trisilicon tetranitride (Si ₃ N ₄ ). Positive number)), inorganic materials such as silicon carbonitride (SiCN), and organic materials such as acrylate, polyurea, parylene, polyimide, and polyamide. The structure 31a is preferably formed of a transparent material. The size of the convex portion C is, for example, about 250 μm long × 50 μm wide × 1 μm high.

The sealing material 45a is provided so as to adhere the element substrate 30a and the sealing substrate 40a to each other at the periphery of the substrate. Here, as a material for forming the sealing material 45a, for example, an epoxy resin, an acrylic resin, a polyimide resin, a phenol resin, or the like having ultraviolet curing properties and / or thermosetting properties may be used.

The filler 46a has a getter function for adsorbing moisture, oxygen, and the like. Here, as a material which comprises the filler 46a, the epoxy resin, silicon resin, etc. which have thermosetting property are mentioned, for example. The filler 46a contains, for example, metal oxides such as calcium oxide (CaO), barium oxide (BaO), and aluminum oxide (Al ₂ O ₃ ), activated carbon, silica gel, zeolite, and the like. Here, the thickness of the filler 46a is preferably smaller than the height of each convex portion C of the structure 31a.

Next, a method for manufacturing the organic EL display device 50a of this embodiment will be described. Here, FIGS. 6 and 7 are cross-sectional views at the center and the end of the device for explaining the method of manufacturing the organic EL display device 50a. FIG. 8 is a cross-sectional view for explaining a modification of the organic EL display device 50a. In addition, the manufacturing method of the organic EL display device 50a of this embodiment includes an element substrate manufacturing process, a sealing substrate manufacturing process, and a bonding process.

<Element substrate manufacturing process>
For example, on the surface of the insulating substrate 10a such as a plastic substrate, the base film 11, the organic EL element 20a (TFT 12, the interlayer insulating film 13, the first electrode 14, the edge cover 15a, the organic EL layer 16a ( The element substrate 30a is manufactured by forming the hole injection layer 1, the hole transport layer 2, the light emitting layer 3, the electron transport layer 4, the electron injection layer 5), the second electrode 17a) and the sealing film 21a.

<Sealing substrate manufacturing process>
For example, an organic film or an inorganic film is formed on the surface of the insulating substrate 10b such as a plastic substrate by using a mask by a CVD (Chemical Vapor Deposition) method, a vapor deposition method, a sputtering method, a coating method, or the like. The structure 31a is formed to produce the sealing substrate 40a.

<Lamination process>
First, as shown in FIG. 6, a seal resin 45 is arranged in a frame shape on the surface of the element substrate 30 a manufactured in the element substrate manufacturing process, for example, by a dispenser method, and a filling resin is placed inside the seal resin 45. 46 is dropped and arranged.

Subsequently, the element substrate 30a on which the sealing resin 45 and the filling resin 46 are arranged, and the sealing substrate 40a manufactured in the sealing substrate manufacturing process, as shown in FIG. 5 and FIG. The respective concave spaces B and the respective convex portions C of the sealing substrate 40a are aligned so as to be fitted to each other, and are bonded together in a reduced pressure atmosphere of about 1 Pa to 30 Pa, for example. Thereafter, the reduced pressure atmosphere is released to pressurize the outer surfaces of the element substrate 30a and the sealing substrate 40a.

Further, for example, after irradiating the sealing resin 45 sandwiched between the element substrate 30a and the sealing substrate 40a with ultraviolet rays, the panel to be irradiated is heated to cure the sealing resin 45 and the filling resin 46, thereby sealing the sealing material 45a. And the filler 46a is formed.

As described above, the organic EL display device 50a of this embodiment can be manufactured. In the above-described embodiment, the method of manufacturing the sealing substrate 40a by forming the structure 31a using the mask on the surface of the insulating substrate 10b is illustrated. However, as illustrated in FIG. When forming the structural body 31a, the other structural body 31aa may be formed so as to overlap the sealing resin 45 (sealing material 45a). According to this configuration, not only the sealing material 45a but also the other structural body 31aa that is harder than the sealing material 45a is disposed at the peripheral end portion of the organic EL display device 50a, so that the peripheral end portion of the organic EL display device 50a is reinforced. can do.

According to the organic EL display device 50a of the present embodiment described above, the following effects can be obtained.

(1) In the organic EL display device 50a of the present embodiment, the surface irregularities A are formed on the element substrate 30a according to the shape of the organic EL element 20a. Here, in the element substrate 30a provided with the organic EL element 20a, a plurality of first electrodes 14 are provided in a matrix as a part of the organic EL element 20a, and the peripheral end portion of each first electrode 14 is provided. The edge cover 15a is provided in a lattice shape so as to cover the surface. Therefore, in the element substrate 30a, the space between the lattices of the edge cover 15a is formed in a concave shape to form a concave space B constituting the surface irregularities A. On the other hand, the sealing substrate 40a is provided with a structure 31a that engages with the surface shape of the element substrate 30a. Here, the structure 31a includes a plurality of convex portions C provided in a matrix. And each convex part C of the structure 31a is provided so that it may fit in each concave space B formed in the element substrate 30a. Accordingly, the filling material 46a made of curable resin is easily filled to a uniform thickness in a region surrounded by the sealing material 45a between the element substrate 30a and the sealing substrate 40a. The amount of shrinkage when the filling resin 46 is cured tends to be constant in the region surrounded by the sealing material 45a. As a result, since the filler 46a provided in the region surrounded by the seal 45a between the element substrate 30a and the sealing substrate 40a is suppressed from being locally greatly shrunk when cured, the element substrate 30a Local peeling between the filler 46a made of curable resin can be suppressed. In addition, when the filling material made of a curable resin is not filled with a uniform thickness, the amount of shrinkage is relatively large at a relatively thick filling portion, so that the shrinkage is relatively large. In some places, local peeling between the element substrate and the curable resin filler tends to occur.

(2) According to the organic EL display device 50a of the present embodiment, since the sealing film 21a is provided so as to cover the organic EL element 20a in the element substrate 30a, the organic EL element 20a is further made of moisture and oxygen. Can be protected.

<< Second Embodiment >>
FIG. 9 is a cross-sectional view of the organic EL display device 50b of this embodiment. In the following embodiments, the same parts as those in FIGS. 1 to 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the first embodiment, the organic EL display device 50a in which the inner wall of the edge cover 15a is upright is illustrated. However, in the present embodiment, the organic EL display device 50b in which the inner wall of the edge cover 15b is inclined is illustrated.

As shown in FIG. 9, the organic EL display device 50b includes an element substrate 30b and a sealing substrate 40b provided so as to face each other, and a seal provided in a frame shape between the element substrate 30b and the sealing substrate 40b. And a curable resin filling material 46b provided in a region surrounded by the sealing material 45a between the element substrate 30b and the sealing substrate 40b. Here, in the organic EL display device 50b, a display area for displaying an image is defined in a rectangular shape inside the sealing material 45a, and a plurality of pixels are arranged in a matrix in the display area.

As shown in FIG. 9, the element substrate 30b covers the insulating substrate 10a, the base film 11 provided on the insulating substrate 10a, the organic EL element 20b provided on the base film 11, and the organic EL element 20b. And a sealing film 21b provided as described above.

As shown in FIG. 9, the organic EL element 20b includes a plurality of TFTs 12, an interlayer insulating film 13, a plurality of first electrodes 14, an edge cover 15b, a plurality of organic EL layers 16b, and a second electrode 17b. It has.

As shown in FIG. 9, the edge cover 15 b is provided in a lattice shape so as to cover the peripheral edge portion of each first electrode 14. Here, as the material constituting the edge cover 15b, for example, silicon oxide (SiO ₂ ), silicon nitride such as trisilicon tetranitride (Si ₃ N ₄ ) (SiNx (x is a positive number)), silicon oxynite, etc. Ride (SiNO) etc. are mentioned. Further, as shown in FIG. 9, the inner wall of the edge cover 15b is inclined at, for example, about 60 ° to 70 ° with respect to the substrate surface so that the lower portion protrudes.

As shown in FIG. 9, the organic EL layer 16b is substantially the same as the organic EL layer 16a described in the first embodiment except for the shape of the peripheral edge that contacts the inclined inner wall of the edge cover 15b.

As shown in FIG. 9, the second electrode 17b is provided so as to cover each organic EL layer 16b and the edge cover 15b. Here, as shown in FIG. 9, the second electrode 17b is substantially the same as the second electrode 17a described in the first embodiment except for the shape of the cross section engaged with the shape of the organic EL layer 16b and the edge cover 15b. Is the same.

As shown in FIG. 9, the sealing film 21b is provided so as to cover the organic EL element 20b. Here, the sealing film 21b is substantially the same as the sealing film 21a described in the first embodiment except for the shape of the cross section that engages with the shape of the second electrode 17b.

In the element substrate 30b having the above configuration, as shown in FIG. 9, the space between the lattices of the edge cover 15b is formed in a concave shape to form a concave space B constituting the surface irregularities A. Here, as shown in FIG. 9, the concave space B is formed such that the side wall (the inner wall of the edge cover 15 b) is inclined so as to become gradually narrower toward the bottom.

As shown in FIG. 9, the sealing substrate 40b includes an insulating substrate 10b and a structure 31b provided on the insulating substrate 10b.

The structure 31b is provided so as to engage with the surface shape of the element substrate 30b, that is, the surface unevenness A. Here, the structure 31b includes a plurality of convex portions C provided in a matrix. And each convex part C of the structure 31b is provided with the side wall inclined so that it may become thin toward the top part so that it may fit in each concave space B formed in the element substrate 30b. The structure 31b is substantially the same as the structure 31a described in the first embodiment except for the shape of the cross section that engages with the concave space B of the element substrate 30b.

The filler 46b has a getter function for adsorbing moisture, oxygen and the like. Here, the filler 46b is substantially the same as the filler 46a described in the first embodiment, except for the shape of the cross section that engages with the concave space B of the element substrate 30b and the structure 31b of the sealing substrate 40b. is there.

The organic EL display device 50b having the above-described configuration can be manufactured using the manufacturing method described in the first embodiment, by simply changing the shape of the edge cover 15b and the structure 31b in the thickness direction.

According to the organic EL display device 50b of the present embodiment described above, the following effects can be obtained in addition to the effects (1) and (2) described above.

(3) According to the organic EL display device 50b of the present embodiment, each concave space B is formed such that the side wall is inclined so as to become gradually narrower toward the bottom, and each convex C is gradually toward the top. The side walls are formed so as to be thinner. Therefore, when the element substrate 30b and the sealing substrate 40b are bonded together, the filling resin constituting the filler 46b is placed along the inclined side walls of the concave space B and the convex portion C between the element substrate 30b and the sealing substrate 40b. Can be spread easily. As a result, the filling material 46b made of curable resin is more easily filled with a uniform thickness in the region surrounded by the sealing material 45a between the element substrate 30b and the sealing substrate 40b. Local peeling between the curable resin filler 46b can be further suppressed.

<< Third Embodiment >>
FIG. 10 is a cross-sectional view of the organic EL display device 50c of this embodiment.

In the first and second embodiments, the organic EL display devices 50a and 50b formed in a flat plate shape are illustrated, but in the present embodiment, the organic EL display device 50c formed in a curved surface shape is illustrated.

As shown in FIG. 10, the organic EL display device 50c includes an element substrate 30c and a sealing substrate 40c provided so as to face each other, and a seal provided in a frame shape between the element substrate 30c and the sealing substrate 40c. A material 45a, and a curable resin filling material 46c provided in a region surrounded by the sealing material 45a between the element substrate 30c and the sealing substrate 40c. Here, in the organic EL display device 50c, a display area for displaying an image is defined in a rectangular shape inside the sealing material 45a, and a plurality of pixels are arranged in a matrix in the display area.

The element substrate 30c is the element substrate 30a of the first embodiment or the element substrate 30b of the second embodiment.

The sealing substrate 40c is the sealing substrate 40a of the first embodiment or the sealing substrate 40b of the second embodiment provided with a structure that engages with the surface shape of the element substrate 30c.

The filler 46c is the filler 46a of the first embodiment or the filler 46b of the second embodiment that engages with the surface shape of the element substrate 30c.

According to the organic EL display device 50c of the present embodiment described above, the following effects can be obtained in addition to the effects (1) to (3) described above.

(4) According to the organic EL display device 50c of this embodiment, since local peeling between the element substrate 30c and the curable resin filler 46c can be suppressed, the organic EL display device 50c is deformed into a curved surface. Even if it is held in a state, display performance can be maintained.

In each of the above embodiments, an organic EL layer having a five-layer structure of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer has been exemplified. A three-layer structure of a hole injection layer / hole transport layer, a light emitting layer, and an electron transport layer / electron injection layer may be employed.

In each of the above embodiments, the organic EL display device using the first electrode as an anode and the second electrode as a cathode has been exemplified. However, the present invention reverses the stacked structure of the organic EL layers and uses the first electrode as a cathode. The present invention can also be applied to an organic EL display device using the second electrode as an anode.

Moreover, in each said embodiment, although the manufacturing method of the organic electroluminescence display which arrange | positions sealing resin and filling resin to an element board | substrate was illustrated, the manufacturing method of an organic electroluminescence display has made sealing resin and filling resin into a sealing substrate. The manufacturing method to arrange | position may be sufficient.

In each of the above embodiments, the organic EL display device including the element substrate using the TFT electrode connected to the first electrode as the drain electrode is illustrated. However, the present invention is not limited to the TFT connected to the first electrode. The present invention can also be applied to an organic EL display device including an element substrate whose electrode is called a source electrode.

As described above, the present invention is useful for flexible organic EL display devices because local peeling between the element substrate and the filler made of curable resin is suppressed.

A surface unevenness B concave space C convex portion 14 first electrodes 15a, 15b edge covers 20a, 20b organic EL elements 21a, 21b sealing films 30a-30c element substrates 31a, 31b structures 31aa other structures 40a-40c sealing Substrate 45a Sealing material 46a to 46c Filling material 50a to 50c Organic EL display device

Claims (7)

An element substrate provided with an organic EL element;
A sealing substrate provided to face the side of the element substrate on which the organic EL element is provided;
A sealing material provided in a frame shape so as to surround the organic EL element between the element substrate and the sealing substrate;
A curable resin filler provided in a region surrounded by the sealing material between the element substrate and the sealing substrate;
An organic EL display device, wherein the sealing substrate is provided with a structure that engages with a surface shape of the element substrate. On the element substrate, surface irregularities due to the shape of the organic EL element are formed,
The organic EL display device according to claim 1, wherein the structure is provided so as to fit into the surface irregularities. The element substrate is provided with a plurality of electrodes in a matrix form as a part of the organic EL element, and an edge cover is provided in a lattice form so as to cover the peripheral edge of each electrode.
The organic EL display device according to claim 2, wherein the structure is provided so as to fit into a concave space between lattices of the edge cover. 4. The organic EL display device according to claim 3, wherein the structure includes a plurality of convex portions provided in a matrix so as to fit into the plurality of concave spaces, respectively. Each concave space is formed with an inclined side wall so as to become gradually narrower toward the bottom,
5. The organic EL display device according to claim 4, wherein each of the convex portions is formed such that a side wall is inclined so as to become gradually thinner toward a top portion. 6. The organic EL display device according to claim 1, wherein a sealing film is provided on the element substrate so as to cover the organic EL element. The organic EL display device according to any one of claims 1 to 6, wherein another structure is provided on the sealing substrate so as to overlap the sealing material.

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