WO2014038158A1 - 有機エレクトロルミネセンス表示装置及びその製造方法 - Google Patents
有機エレクトロルミネセンス表示装置及びその製造方法 Download PDFInfo
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- WO2014038158A1 WO2014038158A1 PCT/JP2013/005072 JP2013005072W WO2014038158A1 WO 2014038158 A1 WO2014038158 A1 WO 2014038158A1 JP 2013005072 W JP2013005072 W JP 2013005072W WO 2014038158 A1 WO2014038158 A1 WO 2014038158A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/18—Tiled displays
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
- H10K50/8445—Encapsulations multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/125—Active-matrix OLED [AMOLED] displays including organic TFTs [OTFT]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
- H10K59/8731—Encapsulations multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
Definitions
- the present invention relates to an organic electroluminescence display device and a manufacturing method thereof, and more particularly to an organic electroluminescence display device having a barrier film in which an inorganic film and an organic film are laminated and a manufacturing method thereof.
- an organic EL display device having an organic electroluminescence (hereinafter, also referred to as “EL”) element in order to suppress deterioration of the organic EL element, when the organic EL element is covered or a plastic substrate is used.
- EL organic electroluminescence
- Patent Document 1 discloses a first barrier layer provided by sequentially vacuum-depositing a SiO 2 film and an Al film on a counter electrode (cathode) constituting the organic EL element, and the first barrier.
- a resin layer provided by vacuum-depositing polyethylene glycol acrylate on the layer and then curing;
- a second barrier layer provided by sequentially vacuum-depositing an Al film and an SiO 2 film on the resin layer;
- Patent Document 2 discloses an electroluminescent element in which a laminated film of a polymer material layer and an inorganic material thin film is provided as the barrier film on the cathode film constituting the organic EL element.
- Patent Document 3 discloses an organic electroluminescent element in which a barrier layer in which organic layers and inorganic layers are alternately stacked on an element portion corresponding to the organic EL element is provided as the barrier film.
- the barrier film may cause peeling at the interface between the inorganic film and the organic film. Then, moisture and oxygen enter from the peeled interface between the inorganic film and the organic film, so that the organic EL element is deteriorated.
- a plastic substrate film substrate
- bending stress is generated at the interface between the inorganic film and the organic film due to the bending of the substrate. Peeling easily occurs at the interface of the organic film.
- the thermal stress is generated at the interface between the inorganic film and the organic film due to the temperature change, so that the peeling occurs at the interface between the inorganic film and the organic film. Is likely to occur.
- Patent Document 4 the first inorganic barrier layer, the first group of dot-like polymer compound layers, the second group of intermediate inorganic barrier layers, and the second group of dot-like polymer compound layers.
- a clathrate inorganic barrier layer is formed by laminating an intermediate third inorganic barrier layer, a third group of dot-like polymer compound layers, and a fourth inorganic barrier layer on the outermost surface in this order.
- An organic EL display panel provided as the barrier film has been proposed.
- the present invention has been made in view of the above points, and the object of the present invention is to provide an interface at the interface between the inorganic film and the organic film due to the stress generated at the interface between the inorganic film and the organic film constituting the barrier film. It is in suppressing peeling.
- the present invention provides a first organic film, a first organic film provided with a plurality of first through holes, a second inorganic film, and a second organic provided with a plurality of second through holes.
- a barrier film is formed by sequentially laminating a film and a third inorganic film.
- an organic electroluminescence display device includes a base substrate, an organic electroluminescence element provided on the base substrate, and a barrier film that suppresses deterioration of the organic electroluminescence element.
- the barrier film includes a first inorganic film, a second inorganic film, and a third inorganic film that are sequentially provided from the base substrate side, and a first organic film that is provided between the first inorganic film and the second inorganic film.
- a second organic film provided between the second inorganic film and the third inorganic film, and the first organic film includes a plurality of the first inorganic film and the second inorganic film that are in contact with each other.
- the second organic film is provided with a plurality of second through holes for bringing the second inorganic film and the third inorganic film into contact with each other.
- the first through hole may be provided so as not to overlap the second through hole.
- the first through hole and the second through hole may be provided linearly.
- the first through hole and the second through hole may be provided in a dot shape.
- the first organic film and the second organic film in which the first through hole and the second through hole are respectively provided in a dot shape are the polymer compounds in the dot-shaped polymer compound layer disclosed in Patent Document 4 above. It has a structure in which the region where the layer is disposed and the region where the polymer compound layer is not disposed are just inverted.
- the barrier film may be a sealing film that covers the organic electroluminescent element.
- the barrier film may be a base coat film provided on the surface of the base substrate on the organic electroluminescence element side.
- the barrier film may be a protective film provided on the surface of the base substrate opposite to the organic electroluminescence element.
- the organic electroluminescence display device includes a base substrate, an organic electroluminescence element provided on the base substrate, and a barrier film that suppresses deterioration of the organic electroluminescence element,
- the barrier films are respectively provided in order from the base substrate side between the first to n-th (n is a natural number of 3 or more) inorganic films provided in order from the base substrate side and the adjacent inorganic films.
- the first to (n-1) organic films, and the first to (n-1) organic films have a plurality of through-holes that contact the inorganic films adjacent to each other. Holes are provided, and at least one of the first to (n-1) th organic films is mutually in plan view with each through hole provided in at least one other organic film different from the organic film. overlapping.
- the manufacturing method of the organic electroluminescent display apparatus which concerns on this invention forms the barrier film which suppresses deterioration of the EL element formation process which forms an organic electroluminescent element in a base substrate, and the said organic electroluminescent element.
- a barrier film forming step wherein the barrier film forming step includes a first inorganic film and a plurality of first through-holes penetrating in the thickness direction.
- One organic film, a second inorganic film, a second organic film provided with a plurality of second through holes penetrating in the thickness direction, and a third inorganic film are sequentially formed.
- the first organic film and the second organic film may be formed so that the first through hole and the second through hole do not overlap each other.
- the first organic film and the second organic film may be formed by a vacuum film forming method.
- the first organic film and the second organic film may be formed by a printing method or a photolithography method.
- the barrier film forming step may be performed after the EL element forming step, and in the barrier film forming step, a sealing film that covers the organic electroluminescent element may be formed as the barrier film.
- the barrier film forming step is performed before the EL element forming step, and in the barrier film forming step, a base coat film that covers the surface of the base substrate on the organic electroluminescence element side is formed as the barrier film. May be.
- the barrier film forming step is performed before the EL element forming step, and in the barrier film forming step, a protective film that covers the surface of the base substrate opposite to the organic electroluminescent element is used as the barrier film. It may be formed.
- a first inorganic film, a first organic film provided with a plurality of first through holes, a second inorganic film, a second organic film provided with a plurality of second through holes, and a third inorganic film Since the barrier film is formed by sequentially laminating the films, it is possible to suppress peeling at the interface between the inorganic film and the organic film due to the stress generated at the interface between the inorganic film and the organic film constituting the barrier film. it can.
- FIG. 1 is a cross-sectional view of the organic EL display device according to the first embodiment.
- FIG. 2 is a plan view showing a pixel structure of the organic EL display device according to the first embodiment.
- FIG. 3 is an equivalent circuit diagram of an organic EL element constituting the organic EL display device according to the first embodiment.
- FIG. 4 is a plan view showing the structure of the through hole of the barrier film constituting the organic EL display device according to the first embodiment.
- FIG. 5 is a cross-sectional view of the barrier film taken along the line VV in FIG.
- FIG. 6 is a plan view showing the structure of the through hole of the first modification of the barrier film according to the first embodiment.
- FIG. 7 is a plan view showing the structure of the through hole of the modified example 2 of the barrier film according to the first embodiment.
- FIG. 8 is a plan view showing the structure of the through hole of the third modification of the barrier film according to the first embodiment.
- FIG. 9 is a plan view showing the structure of the through hole of the modification 4 of the barrier film according to the first embodiment.
- FIG. 10 is a cross-sectional view illustrating Modification Example 5 of the barrier film according to the first embodiment.
- FIG. 11 is a cross-sectional view of the organic EL display device according to the second embodiment.
- FIG. 12 is a cross-sectional view of a barrier film constituting the organic EL display device according to the second embodiment.
- FIG. 13 is a cross-sectional view of the organic EL display device according to the third embodiment.
- FIG. 14 is a cross-sectional view of an organic EL display device according to the fourth embodiment.
- Embodiment 1 of the Invention 1 to 10 show Embodiment 1 of an organic EL display device and a manufacturing method thereof according to the present invention.
- FIG. 1 is a cross-sectional view of the organic EL display device 50a of the present embodiment.
- FIG. 2 is a plan view showing a pixel structure of the organic EL display device 50a.
- 1 is a cross-sectional view taken along line AA in FIG.
- FIG. 3 is an equivalent circuit diagram of the organic EL element 25 constituting the organic EL display device 50a.
- FIG. 4 is a plan view showing the structure Ha of the through hole of the sealing film 31a constituting the organic EL display device 50a.
- FIG. 5 is a cross-sectional view of the sealing film 31a taken along the line VV in FIG.
- the organic EL display device 50 a includes, for example, a base substrate 10 a such as a glass substrate, an organic EL element 25 provided on the base substrate 10 a, and the organic EL element 25 so as to cover the organic EL element 25. And a sealing film 31a provided as a barrier film for suppressing deterioration of the film.
- a plurality of sub-pixels P (see FIG. 2), which are the minimum unit of an image, are arranged in a matrix. Further, in the display area of the organic EL display device 50a, as shown in FIG.
- the sub-pixel P having the light emitting area Lr for performing the red gradation display and the light emitting area Lg for performing the green gradation display are provided.
- the sub-pixels P and the sub-pixels P having the light emitting region Lb for performing blue gradation display are provided adjacent to each other, and one adjacent pixel is constituted by the three adjacent sub-pixels P. .
- the organic EL element 25 has a plurality of gate lines 11 provided on the base substrate 10a so as to extend in parallel with each other, and extends in parallel with each other in a direction orthogonal to the gate lines 11.
- a plurality of source lines 12a provided in this manner, a plurality of power supply lines 12b provided adjacent to each source line 12a in a direction orthogonal to each gate line 11 and extending in parallel with each other, and each gate line 11 and Provided for each intersecting portion of each source line 12a, that is, for each sub-pixel P, and for each of the sub-pixels P and a plurality of first TFTs 13a connected to the corresponding gate line 11 and source line 12a, A plurality of second TFTs 13b connected to the corresponding first TFT 13a and the power supply line 12b, and provided for each of the sub-pixels P, respectively, A plurality of capacitors 13c connected to the source line 12b, an interlayer insulating film 14 provided so as to cover each first TFT 13
- a plurality of light emitting layers 18, an electron transport layer and an electron injection layer 19 provided in order to cover each light emitting layer 18, and a cathode so as to cover the electron transport layer and electron injection layer 19. It was and a second electrode 20.
- a carrier blocking layer for blocking the flow of carriers such as holes and electrons may be inserted between the first electrode 15 and the second electrode 20 as necessary.
- the hole injection layer and hole transport layer 17 and the electron transport layer and electron injection layer 19 may be omitted as appropriate.
- the first TFT 13a and the second TFT 13b are, for example, bottom gate type or top gate type TFTs.
- the capacitor 13c includes, for example, one electrode formed in the same layer with the same material as the gate line 11, the other electrode formed in the same layer with the same material as the source line 12a, and the pair of electrodes.
- the gate insulating film is provided.
- the interlayer insulating film 14 and the edge cover 16 are made of, for example, photosensitive acrylic resin or polyimide resin.
- the first electrode 15 and the second electrode 20 are, for example, transparent conductive films such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), gallium-doped zinc oxide (GZO), It is formed of a metal film such as gold (Au), nickel (Ni), platinum (Pt), or a laminated film thereof.
- the 1st electrode 15 and the 2nd electrode 20 are suitably formed by sputtering method, vacuum evaporation method, CVD method, plasma CVD method, printing method etc., for example.
- the first electrode 15 is light transmissive or light semi-transmissive and the second electrode 20 is light reflective, a bottom emission display that emits light from the base substrate 10a side.
- the first electrode 15 has light reflectivity
- the second electrode 20 has light transmission or light semi-transmission
- light is emitted from the sealing film 31a side.
- a top emission type display device is configured.
- the hole injection layer and the hole transport layer 17 have a function of increasing the hole injection efficiency from the first electrode 15 to the light emitting layer 18 and a function of increasing the hole transport efficiency to the light emitting layer 18.
- anthracene Azatriphenylene, fluorenone, hydrazone, stilbene, triphenylene, benzine, styrylamine, triphenylamine, porphyrin, triazole, imidazole, oxadiazole, oxazole, polyarylalkane, phenylenediamine, arylamine, derivatives thereof, thiophene compounds ,
- the hole injection layer and the hole transport layer 17 may be a single layer having both the function of increasing the hole injection efficiency and the function of increasing the hole transport efficiency. It may be a laminated film of one layer having a function of increasing the hole and one layer having a function of improving the hole transport efficiency. Furthermore, the hole injection layer and the hole transport layer 17 are preferably formed by, for example, a vacuum deposition method.
- Each of the plurality of light emitting layers 18 has a function of emitting light by recombining holes injected from the first electrode 15 side and electrons injected from the second electrode 20 side.
- the light emitting layer 18 is formed of, for example, anthracene, naphthalene, indene, phenanthrene, pyrene, naphthacene, triphenylene, perylene, picene, fluoranthene, acephenanthrylene, pentaphen, pentacene, coronene, butadiene, coumarin, acridine, stilbene, and the like.
- Low molecular fluorescence such as derivatives, tris (8-quinolinolato) aluminum complex, bis (benzoquinolinolato) beryllium complex, tri (dibenzoylmethyl) phenanthroline europium complex, ditoluyl vinyl biphenyl, hydroxyphenyl oxazole, hydroxyphenyl thiazole, etc. It is made of a material having high luminous efficiency such as a dye or a metal complex. Furthermore, the light emitting layer 18 is suitably formed by, for example, a vacuum deposition method.
- the electron transport layer and the electron injection layer 19 have a function of increasing the electron transport efficiency to the light emitting layer 18 and a function of increasing the electron injection efficiency from the second electrode 15 to the light emitting layer 18.
- the electron transport layer and the electron injection layer 19 have a function of increasing the electron transport efficiency even if it is a single layer having both a function of increasing the electron transport efficiency and a function of increasing the electron injection efficiency. It may be a laminated film of one layer and one layer having a function of increasing electron injection efficiency.
- the electron transport layer and the electron injection layer 19 are preferably formed by, for example, a vacuum deposition method.
- the sealing film 31a includes a first inorganic film 26, a first organic film 27, a second inorganic film 28, a second organic film 29, and a third inorganic film provided in this order from the base substrate 10a side. 30.
- the first organic film 27 is provided with a plurality of first through holes 27h each formed in a linear shape so that the first inorganic film 26 and the second inorganic film 28 are in contact with each other. It has been.
- the second organic film 29 is provided with a plurality of second through holes 29h each formed in a linear shape so that the second inorganic film 28 and the third inorganic film 30 are in contact with each other. It has been.
- the first organic film 27 and the second organic film 29 have a through-hole structure Ha arranged so that each first through-hole 27 h does not overlap with each second through-hole 29 h.
- the first organic film 27 and the second organic film 29 having the linear first through hole 27h and the second through hole 29h, respectively, are formed by a vacuum film formation method such as a CVD method, a vapor deposition method, and a sputtering method. Is more suitably formed.
- 6 to 9 are plan views showing the structures Hb to He of the through holes of the modified examples 1 to 4 of the sealing film 31a, respectively.
- linear first through holes 27h and second through holes 29h are alternately arranged so as to extend in the vertical direction in the drawing.
- the first organic film 27 and the second organic film 29 having the linear first through hole 27h and the second through hole 29h, respectively, are formed by a vacuum film formation method such as a CVD method, a vapor deposition method, and a sputtering method. Is more suitably formed.
- the through-hole structure Hc of Modification 2 is randomly provided such that the linear first through-hole 27h and second through-hole 29h extend in the vertical and horizontal directions in the drawing.
- the first organic film 27 and the second organic film 29 having the linear first through hole 27h and the second through hole 29h, respectively, are formed by a vacuum film formation method such as a CVD method, a vapor deposition method, and a sputtering method. Is more suitably formed.
- the through-hole structure Hd of Modification 3 is provided with dot-like first through-holes 27h and second through-holes 29h at random.
- the first organic film 27 and the second organic film 29 having the dot-like first through hole 27h and the second through hole 29h, respectively, are preferably formed by a printing method or a photolithography method.
- the through-hole structure He of the modified example 4 has rectangular first through-holes 27h and second through-holes 29h arranged alternately.
- the first organic film 27 and the second organic film 29 having these rectangular first through hole 27h and second through hole 29h are preferably formed by a printing method or a photolithography method.
- FIG. 10 is a cross-sectional view showing a sealing film 31b of Modification 5 of the sealing film 31a.
- the first through hole 27 has exemplified the through hole structure Ha to He in which the second through hole 29h does not overlap, but the sealing film has three or more layers independent from each other.
- the 1st through-hole 27 may overlap with the 2nd through-hole 29h like the following sealing film 31b.
- the sealing film 31 b includes a first inorganic film 26, a first organic film 27, a second inorganic film 28, and a second film provided in order from the base substrate 10 a side.
- the pinhole Ph formed in the second inorganic film 28 is also continuously formed in the upper inorganic film in the drawing, the pinhole Ph is covered with the (n-1) th organic film Fy. Therefore, no pinhole (Ph) is formed in the nth inorganic film Fz.
- through holes overlap in the first organic film 27, the second organic film 29,..., The (n ⁇ 2) th organic film Fw, and the through holes that overlap each other are the (n ⁇ 1)
- a structure that does not overlap with the through hole of the organic film Fy, that is, at least one of the first to (n-1) th organic films is provided in at least one other organic film different from the organic film.
- the pin pole (Ph) formed in the inorganic film is necessarily covered with any one organic film by overlapping each through hole in plan view, the first to (n ⁇ It goes without saying that the configuration in which the through holes formed in the organic film of 1) do not overlap each other is even better.
- a gate signal is input to the first TFT 13a via the gate line 11 to turn on the first TFT 13a and the gate of the second TFT 13b via the source line 12a.
- a predetermined voltage corresponding to the source signal is written to the electrode and capacitor 13c, the magnitude of the current from the power supply line 12b is defined based on the gate voltage of the second TFT 13b, and the defined current is supplied to the light emitting layer 18.
- the light emitting layer 18 emits light and is configured to display an image.
- the gate voltage of the second TFT 13b is held by the capacitor 13c. Therefore, the light emitting layer 18 emits light until the gate signal of the next frame is input. Maintained.
- the manufacturing method of the organic EL display device 50a of this embodiment includes an EL element forming step and a sealing film forming step.
- the gate line 11, the source line 12a, the power supply line 12b, the first TFT 13a, the second TFT 13b, the capacitor 13c, the interlayer insulating film 14, and the first electrode 15 are formed on the surface of the base substrate 10a such as a glass substrate using a known method.
- the organic EL element 25 is formed by forming the edge cover 16, the hole injection layer and hole transport layer 17, the light emitting layer 18, the electron transport layer and electron injection layer 19, the second electrode 20, and the like.
- ⁇ Sealing film formation process (barrier film formation process)>
- a thin film of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide or the like is formed with a thickness of about 100 nm by, for example, vapor deposition.
- the first inorganic film 26 is formed.
- a thin film of polyacrylate, polyurea, parylene (polyparaxylylene), polyimide, polyamide, or the like is formed on the surface of the first inorganic film 26 by a vapor deposition method with a thickness of about 3 ⁇ m using a vapor deposition mask.
- the first organic film 27 having the first through hole 27h is formed.
- a second inorganic film 28 is formed on the surface of the first organic film 27 by depositing a thin film of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide or the like with a thickness of about 100 nm, for example, by vapor deposition. Form.
- the second inorganic film 28 is formed by depositing a thin film of polyacrylate, polyurea, parylene, polyimide, polyamide or the like on the surface of the second inorganic film 28 with a thickness of about 3 ⁇ m using a vapor deposition mask, for example.
- a second organic film 29 having a through hole 29h is formed.
- a third inorganic film 30 is formed on the surface of the second organic film 29 by depositing a thin film of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide or the like to a thickness of about 100 nm by, for example, vapor deposition. Then, the sealing film 31a is formed.
- the organic EL display device 50a of this embodiment can be manufactured.
- the organic EL display device 50a and the manufacturing method thereof of the present embodiment in the sealing film forming process, the deterioration of the organic EL element 25 formed on the base substrate 10a in the EL element forming process is suppressed.
- the stress generated at each interface of the laminated film of the first inorganic film 26, the first organic film 27, the second inorganic film 28, the second organic film 29, and the third inorganic film 30 is applied to the first organic film 27 and the first organic film 27.
- Each of the two organic films 29 can be dispersed and relaxed, and the first inorganic film 26, the first organic film 27, the second inorganic film 28, the second organic film 29, and the third inorganic film 30 are stacked. Since peeling at each interface can be suppressed, peeling at the interface between the inorganic film and the organic film due to stress generated at the interface between the inorganic film and the organic film constituting the sealing film 31a can be suppressed. .
- the first organic film 27 and the second organic film 29 are formed by the vacuum film forming method, and thus the organic film is formed in a dot shape (island shape).
- the opening ratio of the film formation mask (evaporation mask) for shielding the film formation particles is higher than the case where the first organic film 27 and the second organic film 29 are reduced in film formation speed. Can do.
- the first organic film 27 and the second through hole 29h are not overlapped with each other in the sealing film forming step. Since the second organic film 29 is formed, even if pinholes or cracks are formed in the first inorganic film 26 or the second inorganic film 28, the pinholes or cracks are generated in the first organic film 27 or the second organic film 29. As a result, the deterioration of the barrier properties of the sealing film 31a can be suppressed.
- FIG. 11 is a cross-sectional view of the organic EL display device 50b of this embodiment.
- FIG. 12 is a cross-sectional view of the base coat film 6 constituting the organic EL display device 50b.
- the same portions as those in FIGS. 1 to 10 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the organic EL display device 50a provided with the sealing film 31a (31b) as the barrier film is exemplified.
- the organic EL display device 50b provided with the base coat film 6 as the barrier film Is illustrated.
- the organic EL display device 50b includes, for example, a base substrate 10b such as a plastic substrate, and a base coat film 6 provided on the base substrate 10b as a barrier film for suppressing deterioration of the organic EL element 25.
- a base substrate 10b such as a plastic substrate
- a base coat film 6 provided on the base substrate 10b as a barrier film for suppressing deterioration of the organic EL element 25.
- the base substrate 10b and the sealing substrate 33 are provided with a sealing resin 34 provided in a frame shape so as to adhere to each other.
- the base coat film 6 includes a first inorganic film 1, a first organic film 2, a second inorganic film 3, a second organic film 4, and a third inorganic film 5 provided in this order from the base substrate 10 b side. It has.
- the first organic film 2 is provided with a plurality of first through holes 2h each formed in a linear shape so that the first inorganic film 1 and the second inorganic film 3 are in contact with each other. It has been.
- the second organic film 4 is provided with a plurality of second through holes 4h each formed in a linear shape so that the second inorganic film 3 and the third inorganic film 5 are brought into contact with each other. It has been.
- the first organic film 2 and the second organic film 4 are provided so that the first through holes 2h do not overlap the second through holes 4h.
- the first organic film 2 and the second organic film 4 having the linear first through hole 2h and the second through hole 4h, respectively, are suitable by, for example, a vacuum film forming method such as a CVD method, a vapor deposition method, or a sputtering method. Formed.
- the sealing film 32 is made of, for example, an inorganic film such as silicon nitride, silicon oxide, silicon oxynitride, or aluminum oxide.
- the sealing substrate 33 is, for example, a metal plate, a glass substrate, a plastic substrate on which a base coat film having the same configuration as the base coat film 6 is formed.
- the sealing resin 34 is made of, for example, an ultraviolet curable epoxy resin.
- the inside of the space surrounded by the sealing film 32, the sealing substrate 33, and the sealing resin 34 is filled with an inert gas such as argon or an organic resin.
- the organic resin may contain a desiccant or an oxygen absorbent.
- a sheet material containing a desiccant or an oxygen absorbent is attached to the inside of the space surrounded by the sealing film 32, the sealing substrate 33, and the sealing resin 34, or the desiccant or the oxygen absorbent is added.
- the sealing film 32 may be omitted as long as the barrier properties of the sealing substrate 33 and the sealing resin 34 can be sufficiently ensured.
- the manufacturing method of the organic EL display device 50b of this embodiment includes a base coat film forming step, an EL element forming step, and a sealing step.
- the first inorganic film 1 is formed on the surface of the base substrate 10b such as a plastic substrate by depositing a thin film of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide or the like with a thickness of about 100 nm by vapor deposition. Form.
- a thin film of polyacrylate, polyurea, parylene, polyimide, polyamide, or the like is formed on the surface of the first inorganic film 1 with a thickness of about 3 ⁇ m by using, for example, a vapor deposition method.
- a first organic film 2 having one through hole 2h is formed.
- a thin film such as silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide or the like is formed on the surface of the first organic film 2 by a vapor deposition method, for example, to a thickness of about 100 nm, thereby forming the second inorganic film 3.
- the second inorganic film 3 is formed by depositing a thin film of polyacrylate, polyurea, parylene, polyimide, polyamide, etc. on the surface of the second inorganic film 3 with a thickness of about 3 ⁇ m using a vapor deposition mask, for example.
- a second organic film 4 having a through hole 4h is formed.
- a third inorganic film 5 is formed on the surface of the second organic film 4 by depositing a thin film of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide, or the like with a thickness of about 100 nm, for example, by vapor deposition. Then, a base coat film 6 covering the surface of the base substrate 10b is formed.
- a gate line 11, a source line 12a, a power supply line 12b, a first TFT 13a, a second TFT 13b, a capacitor 13c, and an interlayer insulating film 14 are formed on the surface of the base coat film 6 formed in the base coat film forming step using a known method.
- the organic EL element 25 is formed by forming the electrode 15, the edge cover 16, the hole injection layer and hole transport layer 17, the light emitting layer 18, the electron transport layer and electron injection layer 19, and the second electrode 20. .
- a thin film made of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide or the like is formed to a thickness of 100 nm on the surface of the organic EL element 25 (second electrode 20) formed in the EL element forming step by, for example, vapor deposition.
- the sealing film 32 is formed by forming the film to the extent.
- a sealing resin 34 is formed in a frame shape on the edge of the sealing film 32.
- the sealing resin 34 is cured.
- the organic EL display device 50b of this embodiment can be manufactured.
- the deterioration of the organic EL element 25 formed on the base substrate 10b in the EL element forming process is suppressed in the base coat film forming process.
- the base coat film 6 the first inorganic film 1, the first organic film 2 provided with a plurality of first through holes 2 h penetrating in the thickness direction, the second inorganic film 3, and the plurality of second through holes 4 h Is formed by sequentially forming the second organic film 4 and the third inorganic film 5 provided so as to penetrate in the thickness direction, the first organic film 2 and the second organic film 4 are each formed of the entire film. It is connected.
- the stress generated at each interface of the laminated film of the first inorganic film 1, the first organic film 2, the second inorganic film 3, the second organic film 4, and the third inorganic film 5 is applied to the first organic film 2 and the first organic film 2.
- 2 can be dispersed and relaxed in the whole of the organic film 4, and can be a laminated film of the first inorganic film 1, the first organic film 2, the second inorganic film 3, the second organic film 4 and the third inorganic film 5. Since peeling at each interface can be suppressed, peeling at the interface between the inorganic film and the organic film due to stress generated at the interface between the inorganic film and the organic film constituting the base coat film 6 can be suppressed.
- the organic EL display device 50b using a plastic substrate as the base substrate 10b and the manufacturing method thereof are exemplified, but the base coat film 6 (barrier film) is used even when a glass substrate is used as the base substrate 10b.
- the base coat film 6 carrier film
- a barrier film is not necessary for the purpose of suppressing the oxygen and moisture permeation.
- a thin glass substrate having a thickness of about 50 ⁇ m is used.
- the barrier film is formed as a base coat film on the glass substrate, the bending stress is dispersed and alleviated in the whole of the first organic film (2) and the second organic film (4). As a result, it is possible to prevent the organic EL element (25) from peeling from the base substrate (10b) when the organic EL display device is bent.
- FIG. 13 is a cross-sectional view of the organic EL display device 50c of this embodiment.
- the organic EL display device 50a provided with the sealing film 31a (31b) as the barrier film is illustrated.
- the organic EL display device 50b provided with the base coat film 6 as the barrier film.
- the organic EL display device 50c provided with the base coat film 6 and the sealing film 31a as the barrier film is illustrated.
- the organic EL display device 50c includes, for example, a base substrate 10b such as a plastic substrate, and a base coat film 6 provided on the base substrate 10b as a barrier film for suppressing deterioration of the organic EL element 25. And an organic EL element 25 provided on the base coat film 6 and a sealing film 31a provided as a barrier film for covering the organic EL element 25 so as to suppress the deterioration of the organic EL element 25. .
- the organic EL display device 50c of the present embodiment performs the sealing film forming process described in the first embodiment after sequentially performing the base coat film forming process and the EL element forming process described in the second embodiment. Can be manufactured.
- the base coat film 6 for suppressing the deterioration of the organic EL element 25 formed on the base substrate 10b in the EL element forming process in the base coat film forming process.
- the stress generated at each interface of the laminated film of the first inorganic film 1, the first organic film 2, the second inorganic film 3, the second organic film 4, and the third inorganic film 5 is applied to the first organic film 2 and the first organic film 2.
- 2 can be dispersed and relaxed in the whole of the organic film 4, and can be a laminated film of the first inorganic film 1, the first organic film 2, the second inorganic film 3, the second organic film 4 and the third inorganic film 5. Separation at each interface can be suppressed.
- the sealing film 31a for suppressing the deterioration of the organic EL element 25 formed on the base substrate 10b in the EL element forming step is used as the first inorganic film 26 and the plurality of first through holes.
- the first organic film 27, the second inorganic film 28, and the second organic film 29 provided with a plurality of second through holes 29h penetrating in the thickness direction, Since the three inorganic films 30 are formed in order, the first organic film 27 and the second organic film 29 are connected to each other. Thereby, the stress generated at each interface of the laminated film of the first inorganic film 26, the first organic film 27, the second inorganic film 28, the second organic film 29, and the third inorganic film 30 is applied to the first organic film 27 and the first organic film 27.
- Each of the two organic films 29 can be dispersed and relaxed, and the first inorganic film 26, the first organic film 27, the second inorganic film 28, the second organic film 29, and the third inorganic film 30 are stacked.
- FIG. 14 is a cross-sectional view of the organic EL display device 50d of this embodiment.
- the organic EL display devices 50a to 50c provided with at least one of the sealing film 31a (31b) and the base coat film 6 as the barrier film are exemplified.
- the base coat film 6a is used as the barrier film.
- An organic EL display device 50d provided with a protective film 6b and a sealing film 31a is illustrated.
- the organic EL display device 50d includes, for example, a base substrate 10b such as a plastic substrate, and a base coat film 6a provided on the base substrate 10b as a barrier film for suppressing deterioration of the organic EL element 25.
- a base substrate 10b such as a plastic substrate
- a base coat film 6a provided on the base substrate 10b as a barrier film for suppressing deterioration of the organic EL element 25.
- An organic EL element 25 provided on the base coat film 6a, a sealing film 31a provided as a barrier film for suppressing deterioration of the organic EL element 25 so as to cover the organic EL element 25, and a base substrate 10b
- a protective film 6b provided as a barrier film for suppressing the deterioration of the organic EL element 25 on the back surface (the surface opposite to the organic EL element 25).
- the base coat film 6a and the protective film 6b have substantially the same configuration as the base coat film 6 described in the second embodiment.
- the organic EL display device 50d of the present embodiment performs the EL element forming process after the base coat film forming process described in the second embodiment is performed on the front surface and the back surface of the base substrate 10b, and then the above embodiment. It can be manufactured by performing the sealing film forming step described in 1.
- the base coat film 6a for suppressing deterioration of the organic EL element 25 formed on the base substrate 10b in the EL element forming process and
- the first inorganic film 1, the first organic film 2 provided with a plurality of first through holes 2h penetrating in the thickness direction, the second inorganic film 3, and the plurality of second through holes 4h are thick. Since the second organic film 4 and the third inorganic film 5 that are provided penetrating in the vertical direction are formed in order, the first organic film 2 and the second organic film 4 are connected to each other as a whole. ing.
- the stress generated at each interface of the laminated film of the first inorganic film 1, the first organic film 2, the second inorganic film 3, the second organic film 4, and the third inorganic film 5 is applied to the first organic film 2 and the first organic film 2.
- 2 can be dispersed and relaxed in the whole of the organic film 4, and can be a laminated film of the first inorganic film 1, the first organic film 2, the second inorganic film 3, the second organic film 4 and the third inorganic film 5. Separation at each interface can be suppressed.
- the sealing film 31a for suppressing the deterioration of the organic EL element 25 formed on the base substrate 10b in the EL element forming step is used as the first inorganic film 26 and the plurality of first through holes.
- the first organic film 27, the second inorganic film 28, and the second organic film 29 provided with a plurality of second through holes 29h penetrating in the thickness direction, Since the three inorganic films 30 are formed in order, the first organic film 27 and the second organic film 29 are connected to each other. Thereby, the stress generated at each interface of the laminated film of the first inorganic film 26, the first organic film 27, the second inorganic film 28, the second organic film 29, and the third inorganic film 30 is applied to the first organic film 27 and the first organic film 27.
- Each of the two organic films 29 can be dispersed and relaxed, and the first inorganic film 26, the first organic film 27, the second inorganic film 28, the second organic film 29, and the third inorganic film 30 are stacked.
- the protective film 6b is formed on the back surface of the base substrate 10b, so that the amount of oxygen and moisture that permeate the base substrate 10b can be further reduced. And deterioration of the organic EL element 25 can be further suppressed.
- each inorganic film and each organic film is each formed of a single-layer film.
- each inorganic film and each organic film is The present invention can also be applied to an organic EL display device including a barrier film that is formed of a laminated film.
- an organic EL display device of a three-color light emission method (three-color painting method) is exemplified, but the present invention is not limited to a color filter method (white method) or a color conversion method. The present invention can also be applied to an organic EL display device.
- an active matrix driving type organic EL display device is illustrated, but the present invention can also be applied to a passive matrix driving type organic EL display device.
- the present invention can suppress the peeling at the interface between the inorganic film and the organic film due to the stress generated at the interface between the inorganic film and the organic film constituting the barrier film. This is useful for flexible organic EL display devices that require stress resistance.
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Description
図1~図10は、本発明に係る有機EL表示装置及びその製造方法の実施形態1を示している。ここで、図1は、本実施形態の有機EL表示装置50aの断面図である。また、図2は、有機EL表示装置50aの画素構造を示す平面図である。なお、図1は、図2中のA-A線に沿った断面図である。また、図3は、有機EL表示装置50aを構成する有機EL素子25の等価回路図である。また、図4は、有機EL表示装置50aを構成する封止膜31aの貫通孔の構造Haを示す平面図である。さらに、図5は、図4中のV-V線に沿った封止膜31aの断面図である。
例えば、ガラス基板などのベース基板10aの表面に、周知の方法を用いて、ゲート線11、ソース線12a、電源線12b、第1TFT13a、第2TFT13b、キャパシタ13c、層間絶縁膜14、第1電極15、エッジカバー16、正孔注入層及び正孔輸送層17、発光層18、電子輸送層及び電子注入層19、並びに第2電極20などを形成することにより、有機EL素子25を形成する。
上記EL素子形成工程で形成された有機EL素子25(第2電極20)の表面に、例えば、蒸着法により、窒化シリコン、酸化シリコン、酸窒化シリコン、酸化アルミニウムなどの薄膜を厚さ100nm程度で成膜することにより、第1無機膜26を形成する。
図11は、本実施形態の有機EL表示装置50bの断面図である。また、図12は、有機EL表示装置50bを構成するベースコート膜6の断面図である。なお、以下の各実施形態において、図1~図10と同じ部分については同じ符号を付して、その詳細な説明を省略する。
例えば、プラスチック基板などのベース基板10bの表面に、蒸着法により、窒化シリコン、酸化シリコン、酸窒化シリコン、酸化アルミニウムなどの薄膜を厚さ100nm程度で成膜することにより、第1無機膜1を形成する。
上記ベースコート膜形成工程で形成されたベースコート膜6の表面に、周知の方法を用いて、ゲート線11、ソース線12a、電源線12b、第1TFT13a、第2TFT13b、キャパシタ13c、層間絶縁膜14第1電極15、エッジカバー16、正孔注入層及び正孔輸送層17、発光層18、電子輸送層及び電子注入層19、並びに第2電極20などを形成することにより、有機EL素子25を形成する。
まず、上記EL素子形成工程で形成された有機EL素子25(第2電極20)の表面に、例えば、蒸着法により、窒化シリコン、酸化シリコン、酸窒化シリコン、酸化アルミニウムなどの薄膜を厚さ100nm程度で成膜することにより、封止膜32を形成する。
図13は、本実施形態の有機EL表示装置50cの断面図である。
図14は、本実施形態の有機EL表示装置50dの断面図である。
2,27 第1有機膜
2h,27h 第1貫通孔
3,28 第2無機膜
4,29 第2有機膜
4h,29h 第2貫通孔
5,30 第3無機膜
6,6a ベースコート膜(バリア膜)
6b 保護膜(バリア膜)
10a,10b ベース基板
20 有機EL素子
31a,31b 封止膜(バリア膜)
50a~50d 有機EL表示装置
Claims (15)
- ベース基板と、
上記ベース基板に設けられた有機エレクトロルミネセンス素子と、
上記有機エレクトロルミネセンス素子の劣化を抑制するバリア膜とを備え、
上記バリア膜は、上記ベース基板側から順に設けられた第1無機膜、第2無機膜及び第3無機膜と、該第1無機膜及び第2無機膜の間に設けられた第1有機膜と、該第2無機膜及び第3無機膜の間に設けられた第2有機膜とを有し、
上記第1有機膜には、上記第1無機膜及び第2無機膜を互いに接触させる複数の第1貫通孔が設けられ、
上記第2有機膜には、上記第2無機膜及び第3無機膜を互いに接触させる複数の第2貫通孔が設けられている、有機エレクトロルミネセンス表示装置。 - 上記第1貫通孔は、上記第2貫通孔に重ならないように設けられている、請求項1に記載の有機エレクトロルミネセンス表示装置。
- 上記第1貫通孔及び第2貫通孔は、線状にそれぞれ設けられている、請求項1又は2に記載の有機エレクトロルミネセンス表示装置。
- 上記第1貫通孔及び第2貫通孔は、点状にそれぞれ設けられている、請求項1又は2に記載の有機エレクトロルミネセンス表示装置。
- 上記バリア膜は、上記有機エレクトロルミネセンス素子を覆う封止膜である、請求項1~4の何れか1つに記載の有機エレクトロルミネセンス表示装置。
- 上記バリア膜は、上記ベース基板の上記有機エレクトロルミネセンス素子側の表面に設けられたベースコート膜である、請求項1~5の何れか1つに記載の有機エレクトロルミネセンス表示装置。
- 上記バリア膜は、上記ベース基板の上記有機エレクトロルミネセンス素子と反対側の表面に設けられた保護膜である、請求項1~6の何れか1つに記載の有機エレクトロルミネセンス表示装置。
- ベース基板と、
上記ベース基板に設けられた有機エレクトロルミネセンス素子と、
上記有機エレクトロルミネセンス素子の劣化を抑制するバリア膜とを備え、
上記バリア膜は、上記ベース基板側から順に設けられた第1~第n(nは3以上の自然数)の無機膜と、該隣り合う無機膜の同士の間に上記ベース基板側から順にそれぞれ設けられた第1~第(n-1)の有機膜とを有し、
上記第1~第(n-1)の有機膜には、当該有機膜に隣り合う無機膜同士を互いに接触させる複数の貫通孔がそれぞれ設けられ、
上記第1~第(n-1)の有機膜の少なくとも1層は、当該有機膜と異なる他の有機膜の少なくとも1層に設けられた各貫通孔と平面視で互いに重なっている、有機エレクトロルミネセンス表示装置。 - ベース基板に有機エレクトロルミネセンス素子を形成するEL素子形成工程と、
上記有機エレクトロルミネセンス素子の劣化を抑制するバリア膜を形成するバリア膜形成工程とを備える有機エレクトロルミネセンス表示装置の製造方法であって、
上記バリア膜形成工程では、第1無機膜、複数の第1貫通孔が厚さ方向に貫通して設けられた第1有機膜、第2無機膜、複数の第2貫通孔が厚さ方向に貫通して設けられた第2有機膜、及び第3無機膜を順に形成する、有機エレクトロルミネセンス表示装置の製造方法。 - 上記バリア膜形成工程では、上記第1貫通孔及び第2貫通孔が互いに重ならないように、上記第1有機膜及び第2有機膜を形成する、請求項9に記載の有機エレクトロルミネセンス表示装置の製造方法。
- 上記バリア膜形成工程では、上記第1有機膜及び第2有機膜を真空成膜法により形成する、請求項9又は10に記載の有機エレクトロルミネセンス表示装置の製造方法。
- 上記バリア膜形成工程では、上記第1有機膜及び第2有機膜を印刷法又はフォトリソグラフィ法により形成する、請求項9又は10に記載の有機エレクトロルミネセンス表示装置の製造方法。
- 上記バリア膜形成工程は、上記EL素子形成工程の後に行われ、
上記バリア膜形成工程では、上記バリア膜として、上記有機エレクトロルミネセンス素子を覆う封止膜を形成する、請求項9~12の何れか1つに記載の有機エレクトロルミネセンス表示装置の製造方法。 - 上記バリア膜形成工程は、上記EL素子形成工程の前に行われ、
上記バリア膜形成工程では、上記バリア膜として、上記ベース基板の上記有機エレクトロルミネセンス素子側の表面を覆うベースコート膜を形成する、請求項9~13の何れか1つに記載の有機エレクトロルミネセンス表示装置の製造方法。 - 上記バリア膜形成工程は、上記EL素子形成工程の前に行われ、
上記バリア膜形成工程では、上記バリア膜として、上記ベース基板の上記有機エレクトロルミネセンス素子と反対側の表面を覆う保護膜を形成する、請求項9~14の何れか1つに記載の有機エレクトロルミネセンス表示装置の製造方法。
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5759633B2 (ja) | 2015-08-05 |
| CN104521323B (zh) | 2016-12-07 |
| US9530984B2 (en) | 2016-12-27 |
| KR101589884B1 (ko) | 2016-01-28 |
| CN104521323A (zh) | 2015-04-15 |
| JPWO2014038158A1 (ja) | 2016-08-08 |
| KR20150036525A (ko) | 2015-04-07 |
| US20150214504A1 (en) | 2015-07-30 |
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