JP2006107884A - Organic el panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL panel capable of increasing wiring resistance, and manufacturing a second electrode formed on an upper part of an organic EL layer without using a photolithography method and a film formation mask, and having a segment part (in particular, a segment part capable of variably displaying an image). <P>SOLUTION: This organic EL panel includes the segment part comprising a substrate, a first electrode formed on the substrate, an organic EL layer and a second electrode. The organic EL panel is characterized by that the segment part has a plurality of segments; the first electrode has a stacked structure comprising a metal electrode and a transparent electrode and is a shared electrode for the plurality of segments; and the second electrode is divided into a plurality of parts by separation barriers each having a reversely-tapered cross-sectional shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an organic EL panel. More specifically, the present invention relates to an organic EL panel that performs segment display, and to a reduction in wiring resistance of the panel.

  Since 1987, Tang et al. Of Eastman Kodak Company announced a high-efficiency organic EL device with a two-layer structure, and various organic EL devices have been developed to date. (See Non-Patent Document 1).

  As a full color method, a method of arranging a plurality of types of organic EL light emitting elements emitting different colors on a substrate (so-called three-color coating method), a color conversion method by converting the light emission of the backlight into a wavelength distribution ( Hereinafter, a color filter method that emits light emitted from a backlight through a color filter has been studied. Among these methods, it is not necessary to use a metal mask during film formation, and a CCM method and a color filter method can be used in that a color conversion layer or a color filter layer having a desired pattern can be produced using a photo process. This is advantageous for increasing the display area and resolution.

  Currently, the development of color panels capable of multi-color display is underway for organic EL panels, but depending on how the color panel is used, locations that must be constantly lit in the panel (for example, icons, clock displays) Part) may exist. However, since the constantly lit portion is energized continuously, there is a possibility of causing problems such as burn-in or luminance deterioration. For this reason, there is a case in which a solution method is employed in which segment display is performed by static driving instead of matrix driving for a constantly lit portion. For example, as shown in FIG. 1, an organic EL panel 500 having a fixed display segment unit 650 and / or a variable display segment unit 660 that are statically driven in addition to a matrix driving unit 600 capable of variable display may be formed. Good.

  When forming a segment part in an organic EL panel, it is known that either a cathode or an anode is patterned to form a display shape, and the other is used as a common electrode (see Patent Document 1). In addition, a so-called top emission method that includes a metal cathode formed in a display shape on a support substrate, an organic EL layer, and a transparent electrode used as a common electrode (anode), that extracts light on the side opposite to the support substrate Segment display organic EL panels have been proposed (see Patent Document 2).

JP 09-106887 A JP-A-10-208882 C. W. Tang, S. A. VanSlike, Appl. Phys. Lett. 51, 913 (1987)

  However, a transparent conductive metal oxide such as ITO or IZO, which is generally used to form a transparent electrode, has a lower conductivity than a metal material. Therefore, even if the common electrode is formed using the transparent conductive metal oxide, the wiring resistance cannot be greatly reduced. In the top emission structure, considering that the conductivity of the transparent conductive metal oxide is small, the metal electrode disposed on the support substrate side is used as a common electrode, and the conductive metal disposed on the light extraction side. The pattern of the oxide film needs to be formed by patterning by photolithography or using a film-forming mask that has been aligned. However, photolithographic patterning may cause serious damage to the organic EL layer. In addition, since the method using the film forming mask needs to precisely align the film forming mask, the cost of the apparatus becomes expensive and the manufacturing process becomes complicated.

  Therefore, there is a strong demand for a method of forming a segment portion (particularly a segment portion that can be variably displayed) without increasing the wiring resistance. There is also a need for a method of forming the second electrode formed on the organic EL layer in the segment portion without using a photolithographic method and a film-forming mask.

  The organic EL panel of the present invention is an organic EL panel including a substrate and a segment portion including a first electrode, an organic EL layer and a second electrode provided on the substrate, wherein the segment portion includes a plurality of segments. The first electrode has a laminated structure of a metal electrode and a transparent electrode, and is a common electrode of the plurality of segments; the second electrode has a plurality of separated partition walls having a reverse tapered cross-sectional shape. It is characterized by being separated into parts. Here, the periphery of the separation partition is composed of a plurality of straight lines and a plurality of curves, and each of the plurality of straight lines is continuous with two curves except for a straight line forming an end, Each of the curves is continuous with two straight lines, and the curve is preferably an arc having a radius of curvature of 3 μm or more and a bending angle of 90 ° or more. The substrate may be a color conversion filter including a transparent substrate and one or more color modulation units provided on the transparent substrate.

  The organic EL panel of the present invention may further include a matrix driving unit including a matrix driving unit first electrode, an organic EL layer, and a matrix driving unit second electrode. Here, the second electrode of the matrix driver may be separated into a plurality of portions by the separation partition.

  The organic EL panel of the present invention formed as described above suppresses an increase in wiring resistance by using the first electrode made of a metal / transparent conductive metal oxide laminate having an opening as a common electrode. It becomes possible. Further, by controlling the shape of the partition wall for separating the second electrode, the second electrode having a desired shape can be formed without using the photolithographic patterning and film forming mask of the second electrode itself. Therefore, the segment part can be manufactured more efficiently.

  2 and 3 show the first electrode portion of the organic EL panel of the present invention. FIG. 2 is a top view of the first electrode portion, and FIG. 3 is a cross-sectional view taken along the cutting line (III-III). The first electrode formed on the substrate 10 is a laminate of the metal electrode 20 and the transparent electrode 30, and the insulating film 40 having a plurality of openings is formed on the transparent electrode 30.

  The substrate 1 may be a transparent substrate or a color conversion filter in which a color modulation unit is provided on the transparent substrate. The transparent substrate is desirably transparent to visible light (wavelength 400 to 700 nm). Preferred materials for the transparent substrate include glass and resins such as polyethylene terephthalate and polymethyl methacrylate. Borosilicate glass or blue plate glass is particularly preferable.

  The color modulation section provided on the transparent substrate can be composed of a color filter layer, a color conversion layer, or a laminate of the color filter layer and the color conversion layer. The color filter layer is a layer that transmits only light in a desired wavelength range. In the case of adopting a laminated structure with the color conversion layer, the color filter layer is effective in improving the color purity of the light subjected to wavelength distribution conversion in the color conversion layer. The color filter layer can be formed using, for example, a commercially available color filter material for liquid crystal (such as a color mosaic manufactured by Fuji Film Arch).

  The color conversion layer is a layer made of a color conversion dye and a matrix resin. The color conversion dye is a dye that converts the wavelength distribution of incident light and emits light in different wavelength ranges, and preferably converts the wavelength distribution of near-ultraviolet light or blue to blue-green light from the organic light emitting layer. Thus, it is a pigment that emits light in a desired wavelength band (for example, blue, green, or red). Color conversion dyes are known in the art, such as rhodamine dyes and cyanine dyes that emit red light; coumarin dyes and naphthalimide dyes that emit green light; and coumarin dyes that emit blue light. Any thing that can be used.

  In one organic EL panel, multiple types of color modulators, for example, a red modulator that absorbs light from an organic light emitting layer and emits red light, a green modulator that emits green light, and a blue modulator that emits blue light A part or the like may be provided. In the present invention, one type of color modulation unit may be provided in one segment (corresponding to one opening of the transparent electrode), and light corresponding to the color modulation unit may be extracted. Alternatively, light having a desired hue may be extracted by providing a plurality of types of color modulation sections divided into fine portions in one segment at a predetermined ratio.

  The color modulation part can be formed by applying the material of each layer using a spin coat method, a roll coat method, a cast method, a dip coat method, etc., and then patterning using a photolithographic method or the like. If necessary, a flattening layer (which can be formed using various organic resins) for flattening the electrode formation surface, oxygen and / or moisture from the color modulation portion, and the like to the organic EL layer A passivation layer (which can be formed using an inorganic oxide, an inorganic nitride, or the like) that prevents movement may be formed so as to cover the color modulation portion.

  The metal electrode 20 is formed from the connection portion with the external drive circuit to the entire display portion except for an opening portion necessary for taking out light through the substrate 10 to the outside. The metal electrode 20 can be formed using a metal such as Au, Ag, Cu, Al, Mo, Cr, Ni, or an alloy such as Al—Ag, Al—Cu. The metal electrode 20 may be formed by an evaporation method or a sputtering method using a mask having a desired shape, or after being formed on the entire surface of the substrate by an evaporation method or a sputtering method, the metal electrode 20 is formed into a desired shape by using a photolithography method or the like. Patterning may be performed. The metal electrode 20 usually has a thickness of 10 to 200 nm, preferably 100 to 500 nm. By using a metal or alloy having high conductivity and having a thickness within the above-mentioned range, the sheet resistance value (that is, wiring resistance) of the first electrode that is a laminated structure of the metal electrode 20 and the transparent electrode 30 is reduced. It is possible to suppress a voltage drop that occurs in the first electrode.

The transparent electrode 30 is formed by laminating conductive metal oxides such as SnO ₂ , In ₂ O ₃ , ITO, IZO, ZnO: Al using a sputtering method. The transparent electrode 30 is formed over at least the entire display portion including an opening necessary for extracting light to the outside, and is electrically connected to the metal electrode 20. If necessary, the transparent electrode 30 may be formed also in the connection portion with the external drive circuit, but it is not always necessary. The transparent electrode 30 desirably has a thickness of 50 nm or more, preferably 50 nm to 1 μm, more preferably 100 to 300 nm in the opening.

  In FIG. 3, the laminated structure of the substrate 10 / metal electrode 20 / transparent electrode 30 is illustrated, but the lamination order of the metal electrode 20 and the transparent electrode 30 may be reversed. However, in order not to leave a metal electrode residue on the transparent electrode 30, it is desirable to form the transparent electrode 30 on the metal electrode 20 as shown in FIG.

  In the present invention, the first electrode having a laminated structure of the metal electrode 20 and the transparent electrode 30 is preferably used as an anode from the viewpoint of carrier injection efficiency. The first electrode having the above laminated structure exhibits a lower sheet resistance value than when a conductive metal oxide is used alone, and can suppress an increase in wiring resistance even when used as a common electrode. is there.

The insulating film 40 formed on the transparent electrode 30 is a layer for defining a portion that functions as the first electrode, and is provided on the entire surface of the transparent electrode 30 except for a position corresponding to the opening of the metal electrode 20. . The insulating film 40 is made of an organic resin material such as photoresist or polyimide, or an inorganic oxide such as SiO _x , SiN _x , SiN _x O _y , AlO _x , TiO _x , TaO _x , inorganic nitride, or inorganic oxynitride. Can be used. For the formation of the insulating film 40, such techniques as dry methods (sputtering method, vapor deposition method, CVD method, etc.) and wet methods (spin coating method, roll coating method, casting method, dip coating method, sol-gel method, etc.) Any method known in can be used.

  FIG. 4 shows a cross-sectional view of the organic EL panel of the present invention. On the structure below the insulating film 40 shown in FIG. 3, the separation partition wall 50, the organic EL layer 60, and the second electrode 70 are sequentially stacked.

The organic EL layer 60 includes at least an organic light emitting layer, and includes a hole transport layer, a hole injection layer, an electron transport layer, and / or an electron injection layer as necessary. Each of these layers is formed to have a film thickness sufficient to realize desired characteristics in each layer. For example, what consists of the following layer structures is employ | adopted.
(1) Organic light emitting layer (2) Hole injection layer / organic light emitting layer (3) Organic light emitting layer / electron injection layer (4) Hole injection layer / organic light emitting layer / electron injection layer (5) Hole transport layer / Organic light emitting layer / electron injection layer (6) Hole injection layer / hole transport layer / organic light emitting layer / electron injection layer (7) Hole injection layer / hole transport layer / organic light emitting layer / electron transport layer / electron injection Layer (In the above configuration, the electrode functioning as the anode is connected to the left side, and the electrode functioning as the cathode is connected to the right side)

Any known material can be used as the material of the organic light emitting layer. For example, in order to obtain light emission from blue to blue-green, for example, condensed aromatic ring compounds, ring assembly compounds, metal complexes, styrylbenzene compounds, porphyrin compounds, benzothiazoles, benzimidazoles, benzoxazoles, etc. Materials such as fluorescent brighteners and aromatic dimethylidin compounds are preferably used. Or you may form the organic light emitting layer which emits the light of a various wavelength range by adding a dopant to a host compound. Examples of host compounds include distyrylarylene compounds (for example, IDE-120 manufactured by Idemitsu Kosan Co., Ltd.), N, N′-ditolyl-N, N′-diphenylbiphenylamine (TPD), aluminum tris (8-quinolinolate) (Alq ₃ ). ) Etc. can be used. As dopants, perylene (blue purple), coumarin 6 (blue), quinacridone compounds (blue green to green), rubrene (yellow), 4-dicyanomethylene-2- (p-dimethylaminostyryl) -6-methyl- 4H-pyran (DCM, red), platinum octaethylporphyrin complex (PtOEP, red), or the like can be used.

  As a material for the hole injection layer, Pc (including CuPc) or indanthrene compounds can be used.

  The hole transport layer can be formed using a material having a triarylamine partial structure, a carbazole partial structure, or an oxadiazole partial structure (eg, TPD, α-NPD, PBD, m-MTDATA, etc.).

The material of the electron transport layer, PBD, oxadiazole derivatives such as TPOB; triazine derivatives; phenylquinoxalines like; triazole derivatives such as TAZ BMB-2T, thiophene derivatives such as BMB-3T; as Alq ₃ An aluminum complex or the like can be used.

As the material for the electron injection layer, an aluminum complex such as Alq ₃ or an aluminum quinolinol complex doped with an alkali metal or an alkaline earth metal can be used.

  Further, for the purpose of improving the electron injection efficiency, an alkali metal, an alkaline earth metal, an alloy containing them, an alkali metal or the like is formed at the interface between the organic EL layer 60 and an electrode used as a cathode (preferably the second electrode 70). A buffer layer made of an electron injecting material such as fluoride may be formed. In consideration of the light transmittance of these materials, the thickness of the buffer layer is desirably 10 nm or less.

  Each layer and buffer layer constituting the organic EL layer 60 can be formed by using any means known in the art such as vapor deposition (resistance heating or electron beam heating).

  The second electrode 70 is preferably formed using a highly reflective metal and its alloys, amorphous alloys, and microcrystalline alloys. High reflectivity metals include Al, Ag, Mo, W, Ni, Cr, and the like. The high reflectivity alloy is an alloy containing one or more of the aforementioned metals, and for example, an Al—Ag alloy, an Al—Li alloy, an Mg—Ag alloy, or the like can be used. High reflectivity amorphous alloys include NiP, NiB, CrP, CrB, and the like. High reflectivity microcrystalline alloys include NiAl and the like. In the present invention, it is desirable to use the second electrode 70 as a cathode. The second electrode 70 can be formed using any means known in the art such as vapor deposition (resistance heating or electron beam heating).

  The separation partition 50 is formed before the formation of the organic EL layer 60 and the second electrode 70, and the organic EL layer 60 and the second electrode 70 are separated into segments and wiring portions thereof and other non-display portions. The separation partition 50 is formed to have a reverse tapered cross section by using a negative photoresist and performing coating, pattern exposure, and development processing.

  The second electrode 70 is formed in a desired pattern by using the separation partition wall 50 having a reverse tapered cross section without using a photolithographic method or a film forming mask. The separation partition 50 is formed to have a reverse tapered cross section by using a negative photoresist and performing coating, pattern exposure, and development processing. An example of the shape of the second electrode is shown in FIG. FIG. 5 shows a “day” -shaped arrangement composed of seven segments generally used for displaying numbers. Each of the second electrodes 70 is formed so as to face the transparent electrode 30 provided in the opening of the metal electrode 20, each segment, and a wiring portion that exists above the insulating film 40 and communicates with the external connection terminal. Have

  Here, it is conventionally known that when the separation partition 50 is bent and formed, a sufficient reverse tapered cross-sectional shape cannot be obtained at the inflection point of the separation partition. If a sufficient reverse taper cross-sectional shape cannot be obtained, a failure occurs in which adjacent second electrodes are not electrically separated. This reverse taper cross-sectional shape abnormality is caused by the wraparound of light at the inflection point of the photomask used for pattern exposure (at the position corresponding to the inflection point of the separation partition wall), and more than the portion other than the inflection point. This is presumably because an excessively exposed part occurs.

  The present inventors have found that this problem can be avoided by forming the separation partition wall 50 having a specific shape using a photomask having a specific shape. FIG. 6 shows an enlarged view of the portion indicated by VI in FIG.

  The separation partition wall 50 of the present invention includes a plurality of straight portions 51 and a plurality of bent portions 52, and each of the plurality of straight portions 51 (excluding both ends) is connected to the two bent portions 52, and the plurality of bent portions 52. Each (except for both ends) is connected to two linear portions 51. The “straight portion 51 of the separation partition wall” in the present invention means a portion where the side portion of the separation partition wall is linear. The two side portions existing in one linear portion 51 may be parallel or non-parallel. For example, the straight part 51 may have a shape in which the width of the separation partition wall 50 monotonously increases from one end to the other end. The “bent portion 52 of the separation partition wall” in the present invention means a portion where the side portion of the separation partition wall is formed with an arc. In the present invention, the side portion of the bent portion 52 has a radius of curvature r of 3 μm or more, preferably 5 to 50 μm. The two sides of the bent portion 52 may have different radii of curvature. In addition, in the connecting portion between the straight portion 51 and the bent portion 52, the straight line on each side portion of the straight portion 51 is tangent to the arc of the corresponding side portion of the bent portion 52 so that no inflection point is formed. It is desirable. In the present invention, each bent portion 52 has a length such that the bent angle θ (that is, the angle formed by the side portions of two straight portions adjacent to the curved portion) is 90 ° or more and less than 180 °. .

  In other words, the periphery of the separation partition wall 50 of the present invention is composed of a plurality of straight lines and a plurality of curves, and each of the plurality of straight lines is continuous with two curves except for a straight line forming an end. Each of the plurality of curves is continuous with two straight lines, and each of the curves has a radius of curvature r of 3 μm or more and a bending angle θ of 90 ° or more (an angle formed by two straight lines continuous with the curve). Is an arc having In addition, in a connecting portion of one continuous straight line and one curved line, the straight line is preferably a tangent line of the curved line.

  The photomask used for pattern exposure when forming the separation partition 50 has a structure similar to that of the separation partition.

  In the configuration described above, the organic EL element is statically driven with the first electrode as a common electrode and the second electrode as an electrode having a shape corresponding to each segment. By performing static driving, the entire segment portion can emit light at the same time, and a brighter display can be achieved with lower power than in the case of matrix driving that is affected by the duty ratio.

  As shown in FIG. 1, in addition to the fixed display segment unit 650 and / or the variable display segment unit 660 that are statically driven, a matrix driving unit 600 that can perform variable display can be further provided.

  The matrix drive unit 600 includes a matrix drive unit first electrode composed of a plurality of stripe-shaped portions, an organic EL layer, and a matrix drive unit second electrode composed of a plurality of stripe-shaped portions, and the organic EL layer and the matrix drive unit second electrode Are separated by a separation partition.

  The matrix driver first electrode is formed of a plurality of stripe-shaped portions extending in the first direction. The matrix drive unit first electrode can be formed of the same material as the transparent electrode 30 described above. If necessary, a stripe shape having a plurality of stripe-shaped portions extending in the first direction, formed of the same material as that of the metal electrode 20, and each stripe-shaped portion formed of a transparent conductive oxide. An auxiliary electrode that is electrically connected to each of the portions may be provided. Forming the auxiliary electrode is effective in reducing the wiring resistance. Alternatively, the external connection terminal of the matrix drive unit first electrode may be formed of the same material as that of the metal electrode 20 described above.

  The organic EL layer and the matrix drive unit second electrode have the same configuration as the above-described segment unit, and preferably, based on the separation action by the separation partition 50, each of the organic EL layer and the second electrode of the segment unit Formed simultaneously. The matrix driver second electrode is formed of a plurality of stripe-shaped portions extending in the second direction. Here, the first direction intersects with the second direction, and is preferably orthogonal to the second direction. A portion where the stripe-like portion of the first electrode of the matrix driving unit and the stripe-like portion of the second electrode of the matrix driving unit intersect is a light emitting unit (pixel or subpixel). Further, the external connection terminal of the matrix drive unit second electrode may be formed of the same material as that of the metal electrode 20 described above.

  When performing multicolor display in the matrix drive unit, a color conversion filter having a plurality of types of color modulation units is used as the substrate 1. Each of the plurality of types of color modulation units includes a plurality of portions, and the plurality of portions are arranged at positions corresponding to sub-pixels. For example, when performing full-color display, the pixels are arranged in the matrix drive unit in units of pixels (a color modulation unit of each color corresponds to a sub-pixel) that is a combination of a red modulation unit, a green modulation unit, and a blue modulation unit. It is desirable to do.

Example 1
An organic EL panel having a 10 mm square passive matrix drive section and a 2 mm square static drive green light emission variable display segment section was produced. The subpixel size was 100 μm × 300 μm, and the fill factor was 70%. A black mask was formed on portions other than the color modulation portion on the glass substrate. In the matrix driving unit, the red modulation unit, the green modulation unit, and the blue modulation unit are used as one pixel, and the pixels are arranged in the entire matrix driving unit. On the other hand, in the variable display segment part, a green color modulation part is arranged in a part to be a segment. Here, the red and green modulation portions have a laminated structure of a color filter layer and a color conversion layer, and the blue modulation portion is composed of only the color filter layer. Next, a planarizing layer and a passivation layer were sequentially formed to form the substrate 1.

On the passivation layer, Mo having a thickness of 500 nm was formed by sputtering, and necessary patterning was performed to form the metal electrode 20. That is, in the matrix driving part, the Mo film was left only in the external connection terminal portion of the second electrode. In the variable display segment part, the Mo film was left in the part other than the opening part to be the segment. The resistivity of the formed Mo film was 1.5 × 10 ⁻⁵ Ω · cm.

  Next, a 200 nm-thick IZO film is formed by sputtering using indium-zinc oxide (IZO) as a target and Ar and oxygen as sputtering gases, and then patterned by photolithography using oxalic acid as an etchant. The transparent electrode 30 was formed. That is, in the matrix driving unit, a pattern composed of a plurality of stripe-shaped portions having a width of 100 μm was left. On the other hand, in the variable display segment part, IZO was left on the entire surface including the opening.

  Next, a polyimide film (manufactured by Toray Industries, Inc., Photo Nice) was formed using a photolithographic method, and an insulating film 40 was obtained. In the matrix driving unit, the insulating film 40 is formed in a portion other than the position to be the sub-pixel. On the other hand, in the variable display segment part, an insulating film was formed in a part other than the opening part of the metal electrode 20.

  Next, the separation partition wall 50 was formed using a negative photoresist (manufactured by Zeon Corporation, ZPN1168). After applying a photoresist using a spin coat method, it was pre-baked, and after exposure with a predetermined pattern using a photomask, post-exposure baking (110 ° C. hot plate, 60 seconds) was performed. Next, development was performed to form a desired pattern, and then baking was performed by heating on a hot plate at 160 ° C. for 15 minutes. In the matrix driving unit, the external connection terminal of the first electrode in the direction matrix driving unit orthogonal to the extending direction of the IZO stripe may be formed of the same material as that of the metal electrode 20 described above. It was made into the stripe shape extended to. On the other hand, in the variable display segment portion, as shown in FIGS. 5 and 6, the separation partition wall 50 is formed which includes a straight portion and a bent portion having a curvature radius of 5 μm or more and a bending angle of 90 ° or more and less than 180 °. .

The laminated body formed as described above was moved to a vacuum vapor deposition apparatus, and the organic EL layer 60 and the reflective electrode 70 were sequentially formed by vapor deposition without breaking the vacuum. The organic EL layer 60 has a stacked structure of a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer. The pressure in the vacuum chamber of the apparatus is reduced to 1 × 10 ⁻⁴ Pa, copper phthalocyanine having a thickness of 100 nm is used as a hole injection layer, and 4,4′-bis [N- (1- Naphthyl) -N-phenylamino] biphenyl (α-NPD) as an organic light-emitting layer, 30 nm-thick 4,4′-bis (2,2′-diphenylvinyl) biphenyl (DPVBi), and an electron injection layer Aluminum tris (8-quinolinolate) (Alq ₃ ) having a thickness of 20 nm was laminated. Thereafter, Mg-Ag (Mg / Ag is 10/1 by weight) having a film thickness of 200 nm was laminated to form the second electrode 70. Due to the separation barrier 50, in the matrix driving unit, the second electrode 70 is composed of a plurality of stripe-like portions having a width of 300 nm extending in a direction orthogonal to the stripe-like portion forming the transparent electrode 30. On the other hand, in the variable display segment part, the second electrode having the segment and the wiring part as shown in FIG. 5 was formed.

  The obtained organic EL panel was sealed with a sealing glass and a UV curable adhesive in a dry nitrogen atmosphere (both oxygen concentration and moisture concentration were 10 ppm or less).

  In the obtained organic EL panel, the separation failure between the second electrodes did not occur, and each segment of the variable display segment portion could be turned on / off independently. In addition, the variable display segment unit can perform display having the same luminance as the matrix drive unit by applying a voltage lower than that of the matrix drive unit.

It is a notional top view of an organic EL panel having a segment part and a matrix part. It is a notional top view which shows the 1st electrode of the variable display segment part of the organic electroluminescent panel of this invention. FIG. 3 is a conceptual cross-sectional view showing a first electrode of a variable display segment portion of the organic EL panel of the present invention cut along a cutting line III-III in FIG. 2. It is a conceptual sectional view showing the variable display segment part of the organic EL panel of the present invention. It is a notional top view which shows the 2nd electrode of the variable display segment part of the organic electroluminescent panel of this invention. FIG. 6 is a conceptual top view showing the structure of the separation partition wall of the present invention, in which the VI part in FIG. 5 is enlarged.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Board | substrate 20 Metal electrode 30 Transparent electrode 40 Insulating film 50 Separation partition 60 Organic EL layer 70 2nd electrode

Claims (5)

In an organic EL panel including a substrate and a segment portion including a first electrode, an organic EL layer, and a second electrode provided on the substrate,
The segment part has a plurality of segments;
The first electrode has a laminated structure of a metal electrode and a transparent electrode, and is a common electrode of the plurality of segments;
The organic EL panel, wherein the second electrode is separated into a plurality of portions by a separation partition having a reverse tapered cross-sectional shape.   The periphery of the separation partition wall is composed of a plurality of straight lines and a plurality of curves, and each of the plurality of straight lines is continuous with two curves except for a straight line that forms an end portion. 2. The organic EL panel according to claim 1, wherein each of the curves is continuous with two straight lines, and the curved line is an arc having a radius of curvature of 3 μm or more and a bending angle of 90 ° or more.   The organic EL panel according to claim 1, wherein the substrate includes a transparent substrate and one or more color modulation units provided on the transparent substrate.   The organic EL panel according to claim 1, further comprising a matrix driving unit including a matrix driving unit first electrode, an organic EL layer, and a matrix driving unit second electrode.   The organic EL panel according to claim 4, wherein the second electrode of the matrix driver is separated into a plurality of portions by the separation partition wall.

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