JP2007207656A - Organic EL display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL display having high luminance and capable of high quality display.
An organic EL display comprising an organic EL element having at least a light emitting layer between electrodes and a transparent substrate disposed on one surface side of the organic EL element via a microlens layer The microlens layer is composed of a plurality of convex lens elements arranged so as to form one plane and a flattening layer disposed so as to cover the convex lens elements. Let the shaped lens element have a refractive index greater than that of the planarization layer.
[Selection] Figure 2

Description

  The present invention relates to an organic light emitting display, and more particularly to an organic EL display.

An organic EL display using an organic electroluminescence (EL) element has high visibility due to self-emission, is an all-solid-state display unlike a liquid crystal display, is hardly affected by temperature changes, and has a large viewing angle. In recent years, it has been put into practical use as an organic light emitting display such as a full color display device, an area color display device, and illumination.
Examples of the full color method for organic EL display include, for example, a method in which three primary color organic EL elements are arranged in a predetermined pattern for each emission color, and a white light emission organic EL element is used to display through three primary color filter layers. A CCM system that uses a blue-emitting organic EL element, installs a color conversion phosphor layer (CCM layer) using a fluorescent dye, and converts blue light into green fluorescence or red fluorescence to display three primary colors (Patent Document 1) and the like have been proposed.
In such an organic EL display, light emitted from an organic EL element is transmitted to a laminated structure such as a color filter layer, a color conversion phosphor layer (CCM layer), a transparent substrate, etc., and displayed to an observer. Recognized as light.
Japanese Patent Laid-Open No. 3-152897

In general, brightness is an important factor in displays, and the same applies to organic EL displays as described above. However, in the conventional organic EL display, in order to increase the luminance, it is necessary to increase the voltage / current applied per unit area, thereby increasing the power consumption and shortening the life of the organic EL element. There was a problem.
In addition, since light is emitted in all directions from the organic EL element as a light source, the use efficiency of the emitted light (light incident efficiency to the color filter layer and the color conversion phosphor layer) is lowered, and the luminance is reduced. It was hindering improvement. In addition, there is a problem that display quality is deteriorated due to light emission of different colors.
The present invention has been made in view of such circumstances, and an object thereof is to provide an organic EL display having high luminance and capable of high-quality display.

  In order to achieve such an object, the present invention provides an organic EL element having at least a light emitting layer between electrodes, and a transparent substrate disposed on one surface side of the organic EL element via a microlens layer. The microlens layer comprises a plurality of convex lens elements arranged so as to form one plane, and a planarizing layer disposed so as to cover the convex lens elements. The refractive index was set to be larger than the refractive index of the planarizing layer.

As another aspect of the present invention, the refractive index of the convex lens element is in the range of 1.5 to 1.8, and the refractive index of the planarizing layer is in the range of 1.3 to 1.6. The configuration.
As another aspect of the present invention, the convex lens element has a diameter in the range of 10 to 300 μm.
As another aspect of the present invention, a color filter layer is provided between the transparent substrate and the microlens layer.
In another embodiment of the present invention, a color conversion phosphor layer is provided between the transparent substrate and the microlens layer.
In another embodiment of the present invention, a color filter layer is provided between the transparent substrate and the color conversion phosphor layer.

As another aspect of the present invention, the light emitting layer is configured such that the light emitting layers of the three primary colors are arranged in a desired pattern.
As another aspect of the present invention, the light emitting layer is configured to be a white light emitting layer.
As another aspect of the present invention, the light emitting layer is configured to be a blue light emitting layer.
As another aspect of the present invention, the organic EL element is of an active matrix drive type.
As another aspect of the present invention, the microlens layer is positioned on the electrode side provided with the drive element among the opposed electrodes constituting the active matrix drive system.
As another aspect of the present invention, the microlens layer is positioned on the electrode side that does not include a drive element among the opposed electrodes that constitute the active matrix drive system.
As another aspect of the present invention, the organic EL element is of a passive matrix drive type.

  In the organic EL display of the present invention, the light emitted from the organic EL element so as to diverge in all directions is condensed by the microlens layer, so that the optical loss inside the display is greatly reduced and the light use efficiency is reduced. As a result, the emission luminance is increased and emission of different colors is prevented from being mixed, so that color purity is improved and high quality display is possible.

The present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 is a schematic configuration diagram showing an embodiment of an organic EL display of the present invention. As shown in FIG. 1, an organic EL display 1 of the present invention includes an organic EL element 2 and a transparent substrate 4 disposed on one surface side of the organic EL element 2 via a microlens layer 3. It has.
The organic EL element 2 constituting the organic EL display 1 is formed by arranging organic EL elements 2R, 2G, and 2B of three primary colors in a predetermined pattern.

As shown in FIGS. 2A and 2B, the microlens layer 3 constituting the organic EL display 1 includes a plurality of convex lens elements 3A arranged so as to form one plane P, and these The flattening layer 3B is disposed so as to cover the uneven surface generated on the tip end side of the convex lens element 3A. The refractive index of the convex lens element 3A is larger than the refractive index of the planarizing layer.
In such an organic EL display 1, light emitted from the organic EL element 2 so as to diverge in all directions is condensed by the microlens layer 3. For this reason, the light loss inside the display is greatly reduced, and the light utilization efficiency is improved. In addition, mixing of light emission of each color emitted from the organic EL elements 2R, 2G, and 2B is suppressed.
The transparent base material 4 may include a black matrix having a pattern shape corresponding to the boundary portion between the three primary color organic EL elements 2R, 2G, and 2B.

[Second form]
FIG. 3 is a schematic configuration diagram showing another embodiment of the organic EL display of the present invention. An organic EL display 1 ′ shown in FIG. 3 includes an organic EL element 2, a color filter layer 5 disposed on one surface side of the organic EL element 2 via a microlens layer 3, and a transparent substrate 4. It has.
The organic EL display 1 'includes a color filter layer 5 including three primary color layers 5R, 5G, and 5B corresponding to the organic EL elements 2R, 2G, and 2B, and a pattern corresponding to a boundary portion between the colored layers 5R, 5G, and 5B. The organic EL display 1 is the same as that described above except that the shape of the black matrix 7 is provided. In addition, the same member number is attached | subjected to the member similar to the organic EL display 1. FIG.

  In such an organic EL display 1 ′, light emitted from the organic EL element 2 so as to diverge in all directions is condensed by the microlens layer 3, and light loss inside the display is greatly reduced. Utilization efficiency (incidence efficiency to the color filter layer 5 and the like) is improved. Further, it is possible to suppress the mixing of light emission of each color emitted from the organic EL elements 2R, 2G, 2B and the mixing of light of each color transmitted through the colored layers 5R, 5G, 5B of the color filter layer 5. The

[Third embodiment]
FIG. 4 is a schematic configuration diagram showing another embodiment of the organic EL display of the present invention. An organic EL display 11 shown in FIG. 4 includes an organic EL element 12, a color filter layer 15 disposed on one surface side of the organic EL element 12 via a microlens layer 13, and a transparent substrate 14. I have.
The organic EL element 12 constituting the organic EL display 11 is a white light emitting organic EL element.
Similar to the microlens layer 3 constituting the organic EL display 1 described above, the microlens layer 13 constituting the organic EL display 11 includes a plurality of convex lens elements arranged in a single plane, and these convex shapes. The flattening layer is disposed so as to cover the tip end side of the lens element. The refractive index of the convex lens element is larger than the refractive index of the planarizing layer.

The color filter layer 15 constituting the organic EL display 11 includes three primary color layers 15R, 15G, and 15B arranged in a desired pattern. It is arranged.
In such an organic EL display 11, light emitted from the organic EL element 12 so as to diverge in all directions is collected by the microlens layer 13. Thereby, the light loss inside the display is significantly reduced, and the light use efficiency (incidence efficiency to the color filter layer 15 and the like) is improved. In addition, it is possible to prevent light of each color transmitted through the colored layers 15R, 15G, and 15B of the color filter layer 15 from being mixed.

[Fourth form]
FIG. 5 is a schematic configuration diagram showing another embodiment of the organic EL display of the present invention. An organic EL display 21 shown in FIG. 5 includes an organic EL element 22, a color conversion phosphor layer 26 disposed on one surface side of the organic EL element 22 via a microlens layer 23, and a transparent substrate 24. And.
The organic EL element 22 constituting the organic EL display 21 is a blue light emitting organic EL element.
Similar to the microlens layer 3 constituting the organic EL display 1 described above, the microlens layer 23 constituting the organic EL display 21 includes a plurality of convex lens elements arranged in a single plane, and these convex shapes. The flattening layer is disposed so as to cover the tip end side of the lens element. The refractive index of the convex lens element is larger than the refractive index of the planarizing layer.

The color conversion phosphor layer 26 constituting the organic EL display 21 includes a red conversion phosphor layer 26R that converts blue light into red fluorescence, a green conversion phosphor layer 26G that converts blue light into green fluorescence, and transmits blue light as it is. The blue conversion dummy layers 26B are arranged in a desired pattern, and a black matrix 27 is provided at the boundary between the layers 26R, 26G, and 26B.
In such an organic EL display 21, light emitted from the organic EL element 22 so as to diverge in all directions is condensed by the microlens layer 23. Thereby, the light loss inside the display is greatly reduced, and the light use efficiency (incidence efficiency to the color conversion phosphor layer 26, etc.) is improved. Further, it is possible to prevent light emitted from the layers 26R, 26G, and 26B of the color conversion phosphor layer 26 from being mixed.

[Fifth embodiment]
FIG. 6 is a schematic configuration diagram showing another embodiment of the organic EL display of the present invention. An organic EL display 21 ′ shown in FIG. 6 includes an organic EL element 22, a color conversion phosphor layer 26 disposed on one surface side of the organic EL element 22 via a microlens layer 23, and a color filter layer. 25, and a transparent substrate 24.
The organic EL display 21 'includes the color filter layer 25 including the three primary color layers 25R, 25G, and 25B corresponding to the layers 26R, 26G, and 26B constituting the color conversion phosphor layer 26, except that the above-described color filter layer 25 is provided. It is the same as the organic EL display 21. In addition, the same member number is attached | subjected to the member similar to the organic EL display 21. FIG.

Also in such an organic EL display 21 ′, light emitted from the organic EL element 22 so as to diverge in all directions is collected by the microlens layer 23. For this reason, light loss inside the display is greatly reduced, and light utilization efficiency (incidence efficiency to the color conversion phosphor layer 26, the color filter layer 25, etc.) is improved. Further, mixing of light of each color transmitted through the layers 26R, 26G, and 26B of the color conversion phosphor layer 26 and the colored layers 25R, 25G, and 25B of the color filter layer 25 is also suppressed.
The organic EL display of the present invention is not limited to the above-described embodiment. For example, a gas barrier layer may be provided between the organic EL elements 2, 12 and 22 and the microlens layers 3, 13 and 23.

Next, each component of the organic EL display of the present invention will be described.
[Microlens layer]
As described above, the microlens layers 3, 13, and 23 constituting the organic EL display of the present invention include a plurality of convex lens elements arranged in a single plane, and the tip side of these convex lens elements. The refractive index of the convex lens element is larger than the refractive index of the planarizing layer. The microlens layers 3, 13, and 23 are flat on the uneven surfaces that are generated when the color filter layers 5, 15, and 25 and the color conversion phosphor layer 26 are formed on the transparent base materials 4, 14, and 24. It also has the effect of becoming.
Hereinafter, the microlens layer 3 will be described as an example, but the same applies to the microlens layers 13 and 23.

The convex lens elements 3 </ b> A constituting the microlens 3 are arranged with their tip portions directed in the same direction so as to form one plane P. The shape of each convex lens element 3A may be any of a kamaboko-shaped lenticular lens, a dome-shaped convex lens, and the like, and the cross-sectional shape is not limited to the illustrated one. When the convex lens element 3A is composed of a dome-shaped convex lens, the arrangement of the convex lens elements 3A is not particularly limited. For example, a simple cubic lattice arrangement as shown in FIG. A close-packed hexagonal lattice arrangement as shown in B) can be used.
The diameter D of each convex lens element 3A (a kamaboko-shaped width in the case of a lenticular lens) can be appropriately set within a range of about 10 to 300 μm, for example. Further, the height h of each convex lens element 3A can be appropriately set within a range of about 1 to 20 μm, for example. In the case of a convex lens element having a cross-sectional shape as shown in FIG. 2B, the height H can be appropriately set within a range of about 2 to 25 μm.

On the other hand, the thickness t of the planarizing layer 3B disposed so as to cover the uneven surface generated on the tip end side of the plurality of convex lens elements 3A can be set as appropriate within a range of about 1 to 20 μm. . In the case of the cross-sectional shape as shown in FIG. 2B, the thickness T of the microlens layer 3 can be appropriately set in the range of about 1 to 25 μm.
Refractive index n _a of the convex lens element 3A as described above are those greater than the refractive index n _b of the planarizing layer, for example, the refractive index n _a of the convex lens element 3A 1.5 to 1. 8 about the range can be suitably set in the range refractive index n _b of about 1.3 to 1.6 of the planarization layer. Also, the difference in refractive index n _b and the refractive index n _a is preferably about 0.05 to 0.2. In the present invention, the refractive index is measured using a spectroscopic ellipsometer (manufactured by Horiba, Ltd.).

Examples of the material of the convex lens element 3A and the flattening layer include photo-curing resins and thermosetting resins having reactive vinyl groups such as acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber. Also, as transparent resin, polymethyl methacrylate, polyacrylate, polycarbonate, polyvinyl alcohol, polyvinyl pyrrolidone, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin , Maleic acid resin, polyamide resin, polyimide amide resin, cyclic polyolefin resin, norbornene resin, 4-methylpentene resin, polysulfone resin, polyethersulfone resin, polyarylate resin, polyester Transparent resin materials such as ethylene terephthalate resin, polyethylene terephthalate resin, polypropylene terephthalate resin, fluorine resin, polyurethane resin, polystyrene resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyester resin, silicone resin, maleic acid resin It is done. Furthermore, a sol-gel material composed of a polysiloxane oligomer or the like, or an organic-inorganic hybrid material composed of a polysiloxane oligomer or the like and an organic polymer can also be mentioned. From such materials, the refractive index n _a and the refractive index n _b can be appropriately selected and used.

The convex lens element 3A is formed by preparing a mold such as a lenticular lens shape or a dome shape, applying (filling) the transparent resin material to the mold, pressurizing the transparent base material 4 and transparent. It can be formed by curing a resin material. Instead of the transparent substrate 4, pressure is applied so that the color filter layers 5, 15 of the transparent substrate 4, 14 on which the color filter layers 5, 15 are in contact, or the layers up to the color conversion phosphor layer 26 are laminated. Of course, it is possible to apply pressure so that the color conversion phosphor layer 26 of the transparent substrate 24 is in contact.
Also, a transparent resin having a plurality of convex lens elements 3A is prepared by preparing a mold having a lenticular lens shape or a dome shape, and applying (filling) the above transparent resin material to the mold and curing the mold. A sheet may be prepared, and this transparent resin sheet may be adhered directly or via an adhesive on the transparent substrate 4, the color filter layers 5, 15, or the color conversion phosphor layer 26.

Further, the transparent resin material is applied onto the transparent substrate 4, the color filter layers 5 and 15, and the color conversion phosphor layer 26, and then pressed by pressing a metal mold such as a lenticular lens shape or a dome shape. By processing, a plurality of convex lens elements 3A can be formed.
The plurality of convex lens elements 3A can be formed by the following method. First, a transparent resin film is formed by applying and curing the transparent resin material on the transparent substrate 4, the color filter layers 5 and 15, and the color conversion phosphor layer 26. Next, a photosensitive resist film is formed on the transparent resin film, and the photosensitive resist film is exposed and developed through a desired mask for lens formation to form a resist pattern composed of a plurality of fine patterns. . Next, by using the resist pattern as a mask, the transparent resin film is etched with an etching solution, whereby the convex lens element 3A is formed at a site where each fine pattern is formed. A known negative resist can be used as the photosensitive resist film.

On the other hand, the planarization layer 3B can be formed by applying and curing the transparent resin material so as to cover the plurality of convex lens elements 3A. Further, as described above, when a transparent resin sheet having a plurality of convex lens elements 3A is prepared, the transparent resin sheet is placed on the transparent base material 4, the color filter layers 5 and 15, and the color conversion phosphor layer 26. The flattening layer 3B may be formed before being attached to the surface.
Such microlens layers 3, 13, and 23 may be disposed so that the planarizing layer is positioned on the organic EL elements 2, 12, and 22, and the planarizing layer is the transparent base material 4, 14. , 24 may be disposed on the side.

[Organic EL device]
The organic EL elements 2, 12, and 22 constituting the organic EL display of the present invention basically have at least a pair of electrodes and a light emitting layer positioned between the electrodes. Further, the driving method of the organic EL element may be either a passive matrix or an active matrix.
FIG. 8 is a schematic configuration diagram showing an example of an organic EL element 2 of an active matrix driving method. In FIG. 8, the organic EL element 2 includes a transparent substrate 31, a pair of electrodes 32 and 34, and an organic EL light emitting layer 33 sandwiched between the electrodes 32 and 34. The same applies to the organic EL elements 12 and 22.

In the case of bottom emission in which the transparent substrate 31 extracts light from the organic EL light emitting layer 33 in the direction of arrow a in FIG. 8, the observer can easily see the light from the organic EL light emitting layer 33. It has a degree of transparency. In the case of top emission in which light from the organic EL light emitting layer 33 is extracted in the direction of arrow b in FIG. 8, an opaque base material may be used instead of the transparent base material 31. In any case, the above-described microlens layer 3 or the like is disposed on the surface of the organic EL element 2 in the light extraction direction from the organic EL light emitting layer 33.
The transparent base material 31 (including an opaque base material replacing it) is made of a glass material, a resin material, or a composite material thereof, for example, a glass plate provided with a protective plastic film or a protective plastic layer Etc. are used.

Examples of the resin material and protective plastic material include fluorine resin, polyethylene, polypropylene, polyvinyl chloride, polyvinyl fluoride, polystyrene, ABS resin, polyamide, polyacetal, polyester, polycarbonate, modified polyphenylene ether, polysulfone, and polyarylate. , Polyetherimide, polyamideimide, polyimide, polyphenylene sulfide, liquid crystalline polyester, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyoxymethylene, polyethersulfone, polyetheretherketone, polyacrylate, acrylonitrile-styrene resin, Phenolic resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane, Recone resins, amorphous polyolefins, and the like. Even other resin materials can be used as long as they are polymer materials that can be used for organic EL displays.
The thickness of the transparent substrate 31 is usually about 50 μm to 2.0 mm.

Such a transparent substrate 31 is more preferable if it has good gas barrier properties such as water vapor and oxygen, although it depends on the use of the organic EL display. Further, a gas barrier layer such as water vapor or oxygen may be formed on the transparent substrate 31. As such a gas barrier layer, for example, an inorganic oxide such as silicon oxide, aluminum oxide, or titanium oxide may be formed by a physical vapor deposition method such as a sputtering method or a vacuum vapor deposition method.
The electrode 32 is a pixel electrode, and constitutes an electrode wiring pattern together with signal lines and scanning lines (not shown) formed on the transparent substrate 31 and a TFT (thin film transistor) 41 as a driving element. In the case of bottom emission in which light from the organic EL light-emitting layer 33 is extracted in the direction of arrow a in FIG. 8, this electrode 32 becomes a transparent electrode (pixel electrode) and is extracted in the direction of arrow b in FIG. In the case of emission, it may be either transparent or opaque electrode (pixel electrode).

Such an electrode 32 is not particularly limited as long as it is used in a normal organic EL display, and a metal, an alloy, a mixture thereof, or the like can be used. For example, indium tin oxide (ITO), oxidation A thin film electrode material such as indium, indium zinc oxide (IZO), zinc oxide, stannic oxide, or gold can be given. When the electrode 32 is an electrode for injecting holes, ITO, IZO, indium oxide, and gold, which are transparent or translucent materials having a large work function (4 eV or more) so that holes can be easily injected, are used. preferable. In addition, the electrode 32 preferably has a sheet resistance of several hundred Ω / □ or less, and depending on the material, the thickness can be, for example, about 0.005 to 1 μm.
On the other hand, the electrode 34 is a common electrode, and may be transparent or opaque in the case of bottom emission in which light from the organic EL light emitting layer 33 is extracted in the direction of arrow a in FIG. In the case of top emission extracted in the direction of arrow b, a transparent electrode is used.

  The material of the electrode 34 is not particularly limited as long as it is used for a normal organic EL display, and in the same manner as the electrode layer 32 described above, indium tin oxide (ITO), indium oxide, indium zinc oxide. Thin film electrode materials such as (IZO), zinc oxide, stannic oxide, or gold, and magnesium alloys (eg, MgAg), aluminum or alloys thereof (AlLi, AlCa, AlMg, etc.), silver, etc. it can. When this electrode 34 is an electrode for injecting electrons, a magnesium alloy, aluminum, silver or the like having a low work function (4 eV or less) is preferable so that electrons can be easily injected. Such an electrode layer 34 preferably has a sheet resistance of several hundred Ω / □ or less. For this reason, the thickness of the electrode layer 34 can be, for example, about 0.005 to 0.5 μm.

The organic EL light-emitting layer 33 constituting the organic EL element 2 has, for example, a structure in which a hole injection layer, a light-emitting layer, and an electron injection layer are stacked from the electrode layer 32 side, a structure including a single light-emitting layer, a hole injection layer A structure composed of a light emitting layer, a structure composed of a light emitting layer and an electron injection layer, a structure in which a hole transport layer is interposed between the hole injection layer and the light emitting layer, and a structure comprising a light emitting layer and an electron injection layer. A structure in which an electron transport layer is interposed therebetween can be employed.
In addition, for the purpose of adjusting the emission wavelength or improving the light emission efficiency, an appropriate material can be doped in each of the above layers.
The light emitting layer constituting the organic EL light emitting layer 33 is composed of organic EL elements 2R, 2G, and 2B of the three primary colors of red light emission, green light emission, and blue light emission in the organic EL element 2 shown in FIGS. Depending on the purpose of use of the organic EL display, a light emitting layer having a desired light emission color (for example, yellow, light blue, orange) alone, or a plurality of light emission other than red light emission, green light emission, and blue light emission Any desired combination of colors may be used. Further, the organic EL element 12 shown in FIG. 4 emits white light, and the organic EL element 22 shown in FIGS. 5 and 6 emits blue light.

Examples of the organic light-emitting material used for the light-emitting layer constituting the organic EL light-emitting layer 33 include the following dye-based, metal complex-based, and polymer-based materials.
(1) Dye-based luminescent materials cyclopentadiene derivatives, tetraphenylbutadiene derivatives, triphenylamine derivatives, oxadiazole derivatives, pyrazoloquinoline derivatives, distyrylbenzene derivatives, distyrylarylene derivatives, silole derivatives, thiophene ring compounds, pyridine rings Examples thereof include compounds, perinone derivatives, perylene derivatives, oligothiophene derivatives, trifumanylamine derivatives, oxadiazole dimers, and pyrazoline dimers.

(2) Metal complex light emitting material Aluminum quinolinol complex, benzoquinolinol beryllium complex, benzoxazole zinc complex, benzothiazole zinc complex, azomethylzinc complex, porphyrin zinc complex, europium complex, etc. , Tb, Eu, Dy and the like, and a metal complex having oxadiazole, thiadiazole, phenylpyridine, phenylbenzimidazole, quinoline structure and the like as a ligand.

(3) Polymer-based light-emitting material Examples include polyparaphenylene vinylene derivatives, polythiophene derivatives, polyparaphenylene derivatives, polysilane derivatives, polyacetylene derivatives, polyvinylcarbazole derivatives, polyfluorene derivatives, and the like.
In particular, in the organic EL element 22 shown in FIG. 5 and FIG. 6, examples of the organic light-emitting material that emits blue light used for the organic EL light-emitting layer 33 include benzothiazole-based, benzimidazole-based, and benzoxazole-based fluorescent materials. Examples thereof include a brightener, a metal chelated oxinoid compound, a styrylbenzene compound, a distyrylpyrazine derivative, and an aromatic dimethylidin compound.

  Specifically, benzothiazoles such as 2-2 '-(p-phenylenedivinylene) -bishenzothiazole; 2- [2- [4- (2-benzimidazolyl) phenyl] vinyl] benzimidazole, 2- [ Benzimidazoles such as 2- (4-carboxyphenyl) vinyl] benzimidazole; 2,5-bis (5,7-di-t-pentyl-2-benzoxazolyl) -1,3,4-thiadiazole, Benzoxazole series such as 4,4'-bis (5,7-t-pentyl-2-benzoxazolyl) stilbene, 2- [2- (4-chlorophenyl) vinyl] naphtho [1,2-d] oxazole And the like.

Examples of the metal chelated oxinoid compound include 8-hydroxyquinoline metal complexes such as tris (8-quinolinol) aluminum, bis (8-quinolinol) magnesium, and bis (benzo [f] -8-quinolinol) zinc. Examples include dilithium epinetridione.
Examples of the styrylbenzene compound include 1,4-bis (2-methylstyryl) benzene, 1,4-bis (3-methylstyryl) benzene, 1,4-bis (4-methylstyryl) benzene, Distyrylbenzene, 1,4-bis (2-ethylstyryl) benzene, 1,4-bis (3-ethylstyryl) benzene, 1,4-bis (2-methylstyryl) -2-methylbenzene, 1,4 -Bis (2-methylstyryl) -2-ethylbenzene and the like can be mentioned.

Examples of the distyrylpyrazine derivative include 2,5-bis (4-methylstyryl) pyrazine, 2,5-bis (4-ethylstyryl) pyrazine, and 2,5-bis [2- (1-naphthyl). Vinyl] pyrazine, 2,5-bis (4-methoxystyryl) pyrazine, 2,5-bis [2- (4-biphenyl) vinyl] pyrazine, 2,5-bis [2- (1-pyrenyl) vinyl] pyrazine Etc.
Examples of the aromatic dimethylidin compounds include 1,4-phenylene dimethylidin, 4,4-phenylene dimethylidin, 2,5-xylene dimethylidin, 2,6-naphthylene dimethylidin, 1 , 4-biphenylenedimethylidin, 1,4-p-terephenylenedimethylidin, 9,10-anthracenediyldimethylidin, 4,4'-bis (2,2-di-t-butylphenylvinyl) Biphenyl, 4,4'-bis (2,2-diphenylvinyl) biphenyl, and the like, and derivatives thereof can be mentioned.

Furthermore, as a material of the light emitting layer, a compound represented by the general formula (Rs-Q) 2-AL-OL can be exemplified (in the above formula, AL has 6 to 24 carbon atoms including a benzene ring). A hydrocarbon, OL is a phenylate ligand, Q is a substituted 8-quinolinolato ligand, Rs is a steric bond of two or more substituted 8-quinolinolato ligands to an aluminum atom. Represents an 8-quinolinolate substituent selected to interfere with. Specific examples include bis (2-methyl-8-quinolinolato) (paraphenylphenolate) aluminum (III), bis (2-methyl-8-quinolinolato) (1-naphtholato) aluminum (III), and the like.
The doping material, hole transport material, hole injection material, electron injection material, and the like used for each layer of the organic EL light emitting layer 33 may be any of inorganic materials and organic materials as exemplified below. The thickness of each layer of the organic EL light emitting layer 33 is not particularly limited, and can be, for example, about 10 to 1000 nm.

(Doping material)
Examples include perylene derivatives, coumarin derivatives, rubrene derivatives, quinacridone derivatives, squalium derivatives, porphyrin derivatives, styryl dyes, tetracene derivatives, pyrazoline derivatives, decacyclene, phenoxazone, and the like.

(Hole transport material)
Oxadiazole, oxazole, triazole, thiazole, triphenylmethane, styryl, pyrazoline, hydrazone, aromatic amine, carbazole, polyvinylcarbazole, stilbene, enamine, azine, tri Examples include phenylamine-based, butadiene-based, polycyclic aromatic compound-based, and stilbene dimer.
Further, as the π-conjugated polymer, polyacetylene, polydiacetylene, poly (P-phenylene), poly (P-phenylene sulfide), poly (P-phenylene oxide), poly (1,6-heptadiene), poly (P— Phenylene vinylene), poly (2,5-thienylene), poly (2,5-pyrrole), poly (m-phenylene sulfide), poly (4,4'-biphenylene) and the like.

As the charge transfer polymer complex, polystyrene / AgC104, polyvinylnaphthalene / TCNE, polyvinylnaphthalene / P-CA, polyvinylnaphthalene / DDQ, polyvinylmesitylene / TCNE, polynaphthaacetylene / TCNE, polyvinylanthracene / Br2, polyvinylanthracene / I2 , Polyvinyl anthracene / TNB, polydimethylaminostyrene / CA, polyvinyl imidazole / CQ, poly-P-phenylene / I2, poly-1-vinylpyridine / I2, poly-4-vinylpyridine / I2, poly-P-1- Examples include phenylene, I2, polyvinylpyridium, TCNQ, and the like. Further, TCNQ-TTF and the like are exemplified as a charge transfer low molecular complex, and polycopper phthalocyanine and the like are exemplified as a polymer metal complex.
As the hole transport material, a material having a low ionization potential is preferable, and in particular, a butadiene system, an enamine system, a hydrazone system, and a triphenylamine system are preferable.

(Hole injection material)
Phenylamine, starburst amine, phthalocyanine, oxide such as vanadium oxide, molybdenum oxide, ruthenium oxide, aluminum oxide, amorphous carbon, polyaniline, polythiophene derivative, triazole derivative, oxadiazole derivative, imidazole derivative, polyaryl Alkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, polysilanes, aniline copolymers, And dielectric polymer oligomers such as thiophene oligomers.

  Furthermore, examples of the hole injection material include a porphyrin compound, an aromatic tertiary amine compound, and a styrylamine compound. Examples of the porphyrin compound include polyfin, 1,10,15,20-tetraphenyl-21H, 23H-polyfin copper (II), aluminum phthalocyanine chloride, copper octamethylphthalocyanine, and the like. In addition, aromatic tertiary amine compounds and styrylamine compounds include N, N, N ′, N′-tetraphenyl-4,4′-diaminophenyl, N, N′-diphenyl-N, N′-bis. (3-methylphenyl)-[1,1′-biphenyl] -4,4′-diamine, 4- (di-p-tolylamino) -4 ′-[4 (di-p-tolylamino) styryl] stilbene, 3, -Methoxy-4'-N, N-diphenylaminostilbenzene, 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl, 4,4 ', 4 "-tris [N- ( 3-methylphenyl) -N-phenylamino] triphenylamine and the like.

(Electron injection material)
Calcium, barium, lithium aluminum, lithium fluoride, strontium, magnesium oxide, magnesium fluoride, strontium fluoride, calcium fluoride, barium fluoride, aluminum oxide, strontium oxide, calcium oxide, polymethyl methacrylate, sodium polystyrene sulfonate, Nitro-substituted fluorene derivatives, anthraquinodimethane derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, heterocyclic tetracarboxylic anhydrides such as naphthaleneperylene, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxa Diazole derivatives, thiazole derivatives in which the oxygen atom of the above oxadiazole ring is substituted with a sulfur atom, quinoxaline known as an electron withdrawing group Can quinoxaline derivative having, tris (8-quinolinol) metal complexes of 8-quinolinol derivatives, such as aluminum, phthalocyanine, metal phthalocyanine, a distyryl pyrazine derivatives.

Each layer constituting the organic EL light emitting layer 33 can be formed by forming a film by a printing method such as gravure offset printing or a screen printing method, a vacuum vapor deposition method using a photomask, or the like.
In the case of a passive matrix driving type organic EL element, for example, without providing the TFT 41, signal lines, and scanning lines, the electrodes 32 are formed in a stripe shape in a predetermined direction, and the electrodes 34 are orthogonal to the electrodes 32. It can be formed in a stripe shape in the direction to be. Also in the passive matrix driving method, the light extraction direction from the organic EL light emitting layer 33 may be any of the above-described bottom emission and top emission.

  The organic EL elements 2, 12, and 22 constituting the organic EL display of the present invention are not limited to the above-described form, and may not include the transparent base material 31, for example. In this case, for example, in the example shown in FIG. 1, a pair of electrodes 32 and 34 and the organic EL light emitting layer 33 sandwiched between the electrodes 32 and 34 are formed on the microlens layer 3 by bottom emission, Lamination can be performed in consideration of top emission. In addition, organic EL elements may be stacked through a gas barrier layer. As the gas barrier layer, for example, an inorganic oxide such as silicon oxide, aluminum oxide, titanium oxide or the like may be formed by a physical vapor deposition method such as a sputtering method or a vacuum vapor deposition method.

[Transparent substrate]
The transparent base materials 4, 14, and 24 are provided on the viewer side, and have transparency to the extent that the viewer can easily see the light from the organic EL element. Such a transparent substrate can be selected from the transparent materials mentioned as the transparent substrate 31 in consideration of the refractive index.

[Color filter layer]
The color filter layers 5, 15, and 25 are for correcting the color of light from the organic EL elements 2, 12, and 22 and increasing the color purity. The red colored layers 5R, 15R, and 25R, the green colored layers 5G, 15G, and 25G, and the blue colored layers 5B, 15B, and 25B that constitute the color filter layers 5, 15, and 25 are emission characteristics of the organic EL elements 2, 12, and 22, respectively. Depending on the material, the material can be appropriately selected. For example, it can be formed of a pigment dispersion composition containing a pigment, a pigment dispersant, a binder resin, a reactive compound and a solvent. The thicknesses of the color filter layers 5, 15, 25 can be appropriately set according to the material of each colored layer, the light emission characteristics of the organic EL elements 2, 12, 22 and the like, for example, about 1 to 3 μm. Can be set by range.

[Color conversion phosphor layer]
The color conversion phosphor layer 26 includes a red conversion phosphor layer 26R that converts blue light emitted from the organic EL element 22 into red fluorescence, a green conversion phosphor layer 26G that converts blue light into green fluorescence, and the blue light as it is. The transparent blue conversion dummy layers 26B are arranged in a desired pattern.

  The red conversion phosphor layer 26 </ b> R and the green conversion phosphor layer 26 </ b> G are layers composed of a single fluorescent dye or a layer containing a fluorescent dye in a resin. As a fluorescent dye used for the red conversion phosphor layer 26R for converting blue light emission into red fluorescence, cyanine dyes such as 4-dicyanomethylene-2-methyl-6- (p-dimethylaminostyryl) -4H-pyran, Examples include pyridine dyes such as 1-ethyl-2- [4- (p-dimethylaminophenyl) -1,3-butadienyl] -pyridium-perchlorate, rhodamine dyes such as rhodamine B and rhodamine 6G, oxazine dyes, and the like. It is done. Moreover, as a fluorescent dye used for the green conversion phosphor layer 26G that converts blue light emission into green fluorescence, 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethylquinolidino (9,9a) , 1-gh) coumarin, 3- (2′-benzothiazolyl) -7-diethylaminocoumarin, 3- (2′-benzimidazolyl) -7-N, N-diethylaminocoumarin and other coumarin dyes, and basic yellow 51 and other coumarins. Examples thereof include dye-based dyes, naphthalimide dyes such as Solvent Yellow 11 and Solvent Yellow 116. Furthermore, various dyes such as direct dyes, acid dyes, basic dyes, and disperse dyes can be used as long as they have fluorescence. The above fluorescent dyes can be used alone or in combination of two or more. When the red conversion phosphor layer 26R and the green conversion phosphor layer 26G contain a fluorescent dye in the resin, the content of the fluorescent dye takes into account the fluorescent dye used, the thickness of the color conversion phosphor layer, and the like. For example, it may be about 0.1 to 1 part by weight per 100 parts by weight of the resin used.

The blue conversion dummy layer 26B transmits the blue light emitted from the organic EL element 22 as it is, and is a transparent resin layer having substantially the same thickness as the red conversion phosphor layer 26R and the green conversion phosphor layer 26G. be able to.
When the red conversion phosphor layer 26R and the green conversion phosphor layer 26G contain a fluorescent dye in the resin, the resins include polymethyl methacrylate, polyacrylate, polycarbonate, polyvinyl alcohol, polyvinyl pyrrolidone, hydroxyethyl cellulose, carboxy Transparent (visible light transmittance 50% or more) resin such as methyl cellulose, polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin can be used. . When the pattern of the color conversion phosphor layer 26 is formed by a photolithography method, for example, a photo-curing resist having a reactive vinyl group such as acrylic acid, methacrylic acid, polyvinyl cinnamate, or ring rubber Resin can be used. Further, these resins can be used for the blue conversion dummy layer 26B described above.

  When the red conversion phosphor layer 26R and the green conversion phosphor layer 26G constituting the color conversion phosphor layer 26 are formed of a single fluorescent dye, for example, they are formed in a band shape by a vacuum deposition method or a sputtering method through a desired pattern mask. Can be formed. When forming a layer containing a fluorescent dye in the resin, for example, a coating solution in which the fluorescent dye and the resin are dispersed or solubilized is applied by a method such as spin coating, roll coating, or cast coating. The red conversion phosphor layer 26R and the green conversion phosphor layer 26G can be formed by a method of forming a film and patterning the film by a photolithography method, a method of pattern printing the coating liquid by a screen printing method, or the like. Further, the blue conversion dummy layer 26B is formed by applying a desired photosensitive resin paint by spin coating, roll coating, cast coating, or the like, and patterning this by a photolithography method, or by a desired resin coating solution. Can be formed by a method of pattern printing by a screen printing method or the like.

The thickness of such a color conversion phosphor layer 26 can exhibit a function in which the red conversion phosphor layer 26R and the green conversion phosphor layer 26G sufficiently absorb the blue light emitted from the organic EL element 22 and generate fluorescence. The fluorescent dye to be used, the fluorescent dye concentration, etc. can be set as appropriate, for example, about 10 to 20 μm, and the red conversion phosphor layer 26R and the green conversion phosphor The thickness of the layer 26G may be different.
The above-mentioned embodiment is an illustration and this invention is not limited to these. For example, the black matrix 7, 17, 27 may not be provided.

Next, an Example is shown and this invention is demonstrated further in detail.
(Formation of black matrix)
As a transparent base material, 150 mm × 150 mm, 0.7 mm thick soda glass (manufactured by Central Glass Co., Ltd. Sn surface polished product) was prepared. After cleaning this transparent substrate according to a conventional method, a thin film (thickness 0.2 μm) of oxynitride composite chromium is formed on the entire surface of one side of the transparent substrate by sputtering, and a photosensitive resist is applied onto the composite chromium thin film. , Mask exposure, development, and etching of the composite chrome thin film, and 80 μm × 280 μm rectangular openings are provided in a matrix at a pitch of 100 μm in the 80 μm opening side direction and 300 μm pitch in the 280 μm opening side direction. A matrix was formed.

(Formation of color filter layer)
Three types of photosensitive coatings for colored layers of red, green, and blue were prepared. That is, the photosensitive paint for the red colored layer is a perylene pigment, a lake pigment, an azo pigment, a quinacridone pigment, an anthraquinone pigment, an anthracene pigment, an isoindoline pigment or the like, or a mixture of two or more. The resulting colorant was dispersed in a binder resin. The binder resin is preferably a transparent (visible light transmittance of 50% or more) resin, and examples thereof include transparent resins such as polymethyl methacrylate, polyacrylate, polycarbonate, polyvinyl alcohol, polyvinyl pyrrolidone, hydroxyethyl cellulose, and carboxymethyl cellulose. Further, the content of the coloring material was set to be 30% by weight in the formed colored layer.

  The photosensitive coating for the green colored layer is a single product such as a halogen multi-substituted phthalocyanine pigment, a halogen multi-substituted copper phthalocyanine pigment, a triphenylmethane basic dye, an isoindoline pigment, an isoindolinone pigment, or two types. The coloring material comprising the above mixture was dispersed in a binder resin. Examples of the binder resin include the above-described transparent resin, and the content of the coloring material was set to be 30% by weight in the formed colored layer.

  The photosensitive coating for the blue colored layer is composed of a single material such as a copper phthalocyanine pigment, an indanthrene pigment, an indophenol pigment, a cyanine pigment, a dioxazine pigment, or a colorant composed of a mixture of two or more binder resins. It was assumed that they were dispersed. Examples of the binder resin include the above-described transparent resin, and the content of the coloring material was set to be 30% by weight in the formed colored layer.

Next, a colored layer of each color was formed using the above-described three types of photosensitive paints for colored layers. That is, a photosensitive paint for a green colored layer was applied to the entire surface of the transparent substrate on which the black matrix was formed by a spin coating method, and prebaked (80 ° C., 30 minutes). Then, it exposed using the predetermined photomask for colored layers. Next, development is performed with a developer (0.05% KOH aqueous solution), followed by post-baking (100 ° C., 30 minutes), and a strip-shaped (width 85 μm) green color at a predetermined position with respect to the black matrix pattern. A colored layer (thickness 1.5 μm) was formed.
Similarly, a strip-like (width 85 μm) red colored layer (thickness 1.5 μm) was formed at a predetermined position with respect to the black matrix pattern using the photosensitive paint of the red colored layer. Further, a strip-like (85 μm wide) blue colored layer (thickness of 1.5 μm) was formed at a predetermined position with respect to the black matrix pattern using a photosensitive material of a blue colored layer.

(Formation of color conversion phosphor layer)
Next, the blue conversion dummy layer coating solution (Fuji Hunt Electronics Technology Co., Ltd. Color Mosaic CB-7001) was applied onto the colored layer by spin coating, and prebaked (80 ° C., 30 minutes). Next, patterning was performed by photolithography, and post-baking (100 ° C., 30 minutes) was performed. As a result, a strip-like (width 85 μm) blue conversion dummy layer (thickness 10 μm) was formed on the blue colored layer.
Subsequently, an alkali-soluble negative resist in which a green conversion phosphor (Coumarin 6 manufactured by Aldrich Co., Ltd.) is dispersed is used as a green conversion phosphor layer coating solution, which is applied onto the colored layer by spin coating, and prebaked ( 80 ° C., 30 minutes). Next, patterning was performed by photolithography, and post-baking (100 ° C., 30 minutes) was performed. As a result, a band-like (width 85 μm) green conversion phosphor layer (thickness 10 μm) was formed on the green colored layer.

  Furthermore, an alkali-soluble negative resist in which a red conversion phosphor (Rhodamine 6G manufactured by Aldrich Co., Ltd.) is dispersed is used as a red conversion phosphor layer coating solution, which is applied onto the colored layer by spin coating, and prebaked ( 80 ° C., 30 minutes). Next, patterning was performed by photolithography, and post-baking (100 ° C., 30 minutes) was performed. Thereby, a strip-like (width 85 μm) red conversion phosphor layer (thickness 10 μm) was formed on the red colored layer.

(Formation of microlens layer)
A coating solution for forming a convex lens element in which an acrylate-based photocurable resin (V-259PA / PH5 manufactured by Nippon Steel Chemical Co., Ltd.) is diluted with propylene glycol monomethyl ether acetate is applied onto the color conversion phosphor layer. The film was applied at a thickness of 8 μm by spin coating and pre-dried (120 ° C., 3 minutes). Next, using a photomask having a dot pattern with an opening diameter of 30 μm, exposure was performed with an exposure gap of 500 μm. Thereafter, alkali development (using 0.02 KOH aqueous solution) was performed to form a pattern, followed by baking (230 ° C., 60 minutes). Thus, a dome-shaped convex lens element having a height of 8 μm and a diameter of 40 μm was formed in a close-packed hexagonal lattice array as shown in FIG. The refractive index of this convex lens element was 1.59. The refractive index was measured using a spectroscopic ellipsometer (manufactured by Horiba, Ltd.).
Next, a flattening layer coating solution (manufactured by Tokyo Ohka Kogyo Co., Ltd.) was applied by a bar coating method so as to cover the convex lens element, and cured by irradiation with ultraviolet rays. Thereby, a planarizing layer having a refractive index of 1.42 was formed, and a microlens layer having a thickness of 13 μm was formed.

(Formation of organic EL elements and production of organic EL displays)
First, a gas barrier layer (thickness 150 nm) made of silicon oxide was formed on the microlens layer formed as described above by a sputtering method.
Next, an indium tin oxide (ITO) electrode film having a thickness of 200 nm is formed on the gas barrier layer by an ion plating method, a photosensitive resist is applied on the ITO electrode film, mask exposure, development, The ITO electrode film was etched to form a stripe-shaped transparent electrode layer having a width of 85 μm at a portion corresponding to the color conversion phosphor layer of each color.

  Next, a mask provided with strip-shaped openings having a width of 80 μm at a pitch of 100 μm is prepared, and the mask is arranged so that the strip-shaped openings are positioned on the respective transparent electrode layers. A hole injection layer, a blue light emitting layer, and an electron injection layer were formed by vacuum deposition. That is, first, 4,4 ′, 4 ″ -tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine was deposited to a thickness of 200 nm, and then formed into 4,4′-bis. A hole injection layer was formed on the transparent electrode layer by depositing [N- (1-naphthyl) -N-phenylamino] biphenyl to a thickness of 20 nm to form a hole injection layer. Bis (2,2-diphenylvinyl) biphenyl was evaporated to a thickness of 50 nm to form a light emitting layer, and then tris (8-quinolinol) aluminum was evaporated to a thickness of 20 nm to form an electron injection layer. The blue light-emitting organic EL light-emitting layer formed in this manner was positioned on each transparent electrode layer as a band-shaped pattern having a width of 80 μm.

Next, a mask provided with strip-shaped openings having a width of 280 μm at a pitch of 300 μm was prepared, and the above-described mask was arranged on the 280 μm opening sides of the black matrix so that the strip-shaped openings were orthogonal to the sides. Next, a film was formed by vapor-depositing aluminum through this mask by a vacuum vapor deposition method. Thereby, a stripe-shaped electrode layer (thickness 300 nm) made of aluminum and having a width of 280 μm was formed so as to be orthogonal to the electron injection layer.
Finally, a sealing plate was bonded to the surface side on which the electrode layer was formed via an ultraviolet curable adhesive. Thereby, the organic EL display of the present invention having a structure as shown in FIG. 6 was obtained.

By applying a voltage of DC 8.5V to the transparent electrode layer and the electrode layer of this organic EL display at a constant current density of 10 mA / cm ² and continuously driving, a desired portion where the transparent electrode layer and the electrode layer cross each other. The blue organic EL element layer was made to emit light. The CIE chromaticity coordinates (JIS Z) are used for light emission of each color observed on the opposite side of the transparent substrate after color conversion by the color conversion phosphor layer or transmission as it is and color correction by the color filter layer. 8701). As a result, blue light emission of x = 0.158, y = 0.316, high luminance 950 cd / m ² was confirmed in CIE chromaticity coordinates, and a high luminance display device could be manufactured.

[Comparative example]
Instead of forming the microlens layer, the same flattening layer coating solution as in the example was used, applied by a spin coat method so as to cover the color conversion phosphor layer, and cured by ultraviolet irradiation. Thus, an organic EL display was obtained in the same manner as in Example except that a transparent flattening layer having a thickness of 13 μm was formed.
The voltage was applied to the organic EL display in the same manner as in the examples to observe the image display quality, and the CIE chromaticity coordinates (JIS Z 8701) were measured for the emission of each color. As a result, low luminance (860 cd / m ² ) blue light emission was confirmed, and no image display with high luminance was obtained.

  It is useful in the manufacture of various organic light emitting displays such as full color display devices, area color display devices, and lighting.

It is a schematic block diagram which shows one Embodiment of the organic electroluminescent display of this invention. It is a figure for demonstrating the cross-section of the microlens layer which comprises the organic EL display of this invention. It is a schematic block diagram which shows other embodiment of the organic electroluminescent display of this invention. It is a schematic block diagram which shows other embodiment of the organic electroluminescent display of this invention. It is a schematic block diagram which shows other embodiment of the organic electroluminescent display of this invention. It is a schematic block diagram which shows other embodiment of the organic electroluminescent display of this invention. It is a figure which shows the example of arrangement | positioning of the convex-shaped lens element which comprises a micro lens layer. It is a schematic block diagram which shows an example of the organic EL element which comprises the organic EL display of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 ', 11,21,21' ... Organic EL display 2, 12, 22 ... Organic EL element 3, 13, 23 ... Micro lens layer 3A ... Convex lens element 3B ... Flattening layer 4, 14, 24 ... Transparent substrate 5, 15, 25 ... Color filter layer 7, 17, 27 ... Black matrix 26 ... Color conversion phosphor layer 31 ... Transparent substrate 32, 34 ... Electrode 33 ... Organic EL light emitting layer 41 ... TFT (thin film transistor)

Claims (13)

  An organic EL element having at least a light emitting layer between electrodes, and a transparent substrate disposed on one surface side of the organic EL element via a microlens layer, the microlens layer forming a flat surface A plurality of convex lens elements arranged in a flat plate and a planarizing layer disposed so as to cover the convex lens element, and the refractive index of the convex lens element is larger than the refractive index of the flattening layer. A featured organic EL display.   The refractive index of the convex lens element is in a range of 1.5 to 1.8, and the refractive index of the planarizing layer is in a range of 1.3 to 1.6. Organic EL display.   The organic EL display according to claim 1 or 2, wherein the convex lens element has a diameter in a range of 10 to 300 µm.   The organic EL display according to any one of claims 1 to 3, further comprising a color filter layer between the transparent substrate and the microlens layer.   The organic EL display according to any one of claims 1 to 3, further comprising a color conversion phosphor layer between the transparent substrate and the microlens layer.   The organic EL display according to claim 5, further comprising a color filter layer between the transparent substrate and the color conversion phosphor layer.   5. The organic EL display according to claim 1, wherein the light emitting layer is formed by arranging the light emitting layers of the three primary colors in a desired pattern.   The organic EL display according to claim 4, wherein the light emitting layer is a white light emitting layer.   The organic EL display according to claim 5, wherein the light emitting layer is a blue light emitting layer.   The organic EL display according to claim 1, wherein the organic EL element is of an active matrix driving type.   11. The organic EL display according to claim 10, wherein the microlens layer is located on an electrode side provided with a drive element among opposed electrodes constituting the active matrix drive system.   11. The organic EL display according to claim 10, wherein the microlens layer is located on an electrode side that does not include a drive element among opposed electrodes constituting the active matrix drive system.   The organic EL display according to claim 1, wherein the organic EL element is of a passive matrix driving type.

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