CN100442572C - Organic Electroluminescence Panel - Google Patents

Abstract

An organic electroluminescence panel and a manufacturing method thereof, capable of preventing display performance degradation caused by external incident light entering the panel being reflected by a diffuse reflection part in the panel. An optical filter 18 made of a circular polarizing plate is provided on one side of the supporting substrate 11, and an organic EL element is formed on the other side of the supporting substrate 11. The organic EL element has a first electrode 12 and a second electrode 14 and is sandwiched between the In the organic layer 13 between the first and second electrodes, at least one of the first electrode 12 and the second electrode 14 is made of a transparent electrode. The organic layer 13 contains at least a light-emitting layer. The sealing member 15 of the sealing recess 15A of the EL element is pasted on the other surface of the support substrate 11 . The slope a in the sealing recess 15A is a rough surface to form a diffuse reflection part, and the extension part 14A of the second electrode 14 is provided on the other surface of the support substrate 11 to cover the slope a to form a diffuse reflection preventing means.

Description

Organic Electroluminescence Panel

technical field

The invention relates to an organic electroluminescence (EL) panel and a manufacturing method thereof.

Background technique

Patent Document 1: JP-A-8-321381

Patent Document 2: Japanese Unexamined Patent Publication No. 9-127885

The organic EL panel is based on an organic EL element, which is formed by arranging the organic EL element as a unit surface light-emitting component on a flat substrate. The organic EL element is formed by forming a first electrode on a supporting substrate, and then forming An organic layer including a light-emitting layer made of an organic compound, on which a second electrode is formed.

In this organic EL element, one of the first electrode and the second electrode is made of a transparent electrode made of ITO or the like, while the other is made of a light-reflective metal electrode made of Al, Mg, or the like. The transparent electrode side acquires light emitted from the light emitting layer and the like. The following methods can be considered: the first electrode on the transparent support substrate is made into a transparent electrode, and the bottom emission (bottom emission) method in which light is obtained from the side of the support substrate; the first electrode on the support substrate is made into a metal electrode, and at the same time the The second electrode is made of a transparent electrode, and a top emission method is used to obtain light from the second electrode side.

In such an organic EL element, in order to efficiently emit light emitted from the light-emitting layer or the like from the transparent electrode side, the metal electrode provided opposite to the transparent electrode has a high reflectance to increase luminance. However, since the metal electrode also serves as a reflective mirror with high reflectance to reflect the light incident on the panel from the outside, the following problems arise: the outside scene is reflected when the light is not emitted due to the external incident light, On the other hand, when the light is emitted, the contrast is lowered, or black is not displayed, and the display performance is lowered.

As effective countermeasures for dealing with this problem, the technical solutions described in Patent Documents 1 and 2 have been proposed. The technical solution is to arrange an optical filter composed of a circular polarizing plate on the light exit surface of the organic EL panel. In this way, although the light incident from the outside and passing through the circular polarizing plate becomes right or left circularly polarized light, when the circularly polarized light is reflected by the metal electrodes in the panel, the direction of the circularly polarized light is reversed, so the light incident from the outside is changed by The light reflected by the metal electrodes in the panel is cut off by the circular polarizer and cannot be emitted to the outside.

On the other hand, it is known that the characteristics of an organic EL panel deteriorate when the organic layers and electrodes are exposed to outside air. This is caused by the penetration of water into the interface between the organic layer and the electrode, which hinders electron injection, produces a non-luminous area, or causes corrosion of the electrode. In order to improve the stability and durability of the organic EL element, it is necessary to isolate the organic EL element from the outside air. Sealing technology is essential. As for this sealing technique, a method of affixing a sealing member covering the electrodes and the organic layer with an adhesive to a support substrate on which the electrodes and the organic layer are formed is generally employed.

FIG. 1 is an explanatory view showing a conventional organic EL panel having a sealing member. In the organic EL panel 1, an organic EL element is formed on one side of a support substrate 2. The organic EL element is formed by a first electrode 3 composed of a transparent electrode, an organic layer 4 including a light emitting layer, and a second electrode composed of a metal electrode. 5, the organic EL element is sealed by a sealing member 7 bonded to one side of the support substrate 2 with an adhesive 6. In addition, on the other surface of the support substrate 2, the optical filter 8 composed of the aforementioned circular polarizing plate is provided.

Here, a glass substrate is often used as the sealing member 7, and a flat glass substrate is also bonded with an adhesive 6 containing a spacer. However, as shown in FIG. In the sealed space formed by 7A, the desiccant 9 is provided on the bottom surface of the sealed concave portion 7A. Such a sealing recess 7A is usually formed by blasting with an abrasive material or etching with a chemical solution, but in this method, the slope a of the sealing recess 7A becomes a rough surface, and a diffuse reflection portion is formed there. .

In such a conventional organic EL element 1, when light L ₀₁ from the outside enters the panel through the optical filter 8, it becomes circularly polarized light L ₀₂ in the right or left direction, which is captured by the second electrode composed of a metal electrode. 5 After specular reflection, it becomes circularly polarized light L ₀₃ in the opposite direction. Therefore, as described above, the light incident from the outside and reflected by the second electrode 5 is cut off by the optical filter 8 and cannot be emitted to the outside. However, as described above, if the diffuse reflection part is formed in the panel, even if the light L ₁₁ from the outside enters the panel through the optical filter 8 and becomes circularly polarized light L ₁₂ in the right or left direction, it will be detected. The diffuse reflection part reflects the light L ₁₃ having a disordered polarization plane, so that reflected light L ₁₄ passing through the optical filter 8 is generated, and a portion where the optical filter 8 cannot function effectively occurs locally.

Therefore, there arises a problem that the contrast is lowered due to reflected light emitted from the peripheral portion of the panel etc. during light emission, and the external scenery is reflected during non-light emission, thereby deteriorating display performance.

Contents of the invention

The present invention makes it a subject to solve such a problem. That is, an object of the present invention is to prevent display performance from deteriorating due to external incident light entering the panel being reflected by the diffuse reflection portion within the panel.

In order to achieve the above objects, the present invention has at least the following configurations.

An organic EL panel, an optical filter composed of a circular polarizing plate is provided on one side of a supporting substrate, an organic EL element is formed on the other side of the supporting substrate, and the organic EL element has a first electrode and a second electrode and an organic layer sandwiched between the first and second electrodes, at least one of the first electrode and the second electrode is made of a transparent electrode, the organic layer includes at least a light-emitting layer, and is formed by pasting on the other surface There is a sealing member for sealing the sealing recess of the organic EL element, wherein the sealing member is formed of glass, a desiccant is provided on the bottom surface of the sealing recess, the slope of the sealing recess is a rough surface, and the support Anti-diffuse reflection means for preventing external incident light entering the organic electroluminescent panel from being reflected by the rough surface of the sealing recess is provided on the surface of the substrate other than the surface on which the optical filter is provided. .

Description of drawings

FIG. 1 is an explanatory diagram of the prior art.

FIG. 2 is an explanatory diagram illustrating an organic EL panel according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating an organic EL panel according to another embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating an organic EL panel according to still another embodiment of the present invention.

Symbol Description

10, 20, 30: organic EL panel; 11: supporting substrate; 12: first electrode; 13: organic layer; 14: second electrode; 14A: extension; 15: sealing member; 15A sealing recess; 15B: notch ; 16: adhesive; 17: desiccant; 18: optical filter.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is an explanatory view showing an organic EL panel according to an embodiment of the present invention. First, the basic structure of the organic EL panel 10 according to the embodiment of the present invention will be described. An optical filter 18 composed of a circular polarizing plate is provided on one side of a support substrate 11, and an organic EL panel is formed on the other surface of the support substrate 11. The organic EL element has a first electrode 12 and a second electrode 14 and an organic layer 13 sandwiched between the first and second electrodes, at least one of the first electrode 12 and the second electrode 14 is formed by a transparent electrode The organic layer 13 includes at least a light-emitting layer, and the sealing member 15 formed with the sealing recess 15A for sealing the organic EL element is attached to the other surface of the supporting substrate 11 with an adhesive 16 . In the embodiments described below, the bottom emission method in which the supporting substrate 11 side is the light exit surface is taken as an example, but the present invention is not limited thereto.

Furthermore, the desiccant 17 is attached to the bottom surface of the sealing recess 15A formed on the sealing member 15, and the slope a of the sealing recess 15A is a rough surface, forming a diffuse reflection part. Sometimes such a diffuse reflection part is not only formed by the slope a, but is formed in the panel during various forming processes. Each of the following embodiments has a diffuse reflection prevention means that prevents external incident light entering the panel from being reflected by such a diffuse reflection part, so that external incident light does not reflect by the diffuse reflection part and exit through the optical filter 18. Therefore, the function of the optical filter 18 can be ensured on the entire surface of the supporting substrate, thereby preventing deterioration of the display performance of the organic EL panel.

Features of each embodiment will be described below. In the following description, the diffuse reflection part formed by the slope a is used as an example for description, but the same process can also be performed on other diffuse reflection parts. In the embodiment shown in FIG. 2 , an extension 14A of the second electrode 14 made of a light-reflective electrode is provided on the other surface of the support substrate 11 so as to cover the slope a of the sealing recess 15A to form a diffuse reflection prevention unit. .

In the embodiment shown in FIG. 2 , an extension of the second electrode 14 is provided, but an extension of the first electrode 12 made of a transparent electrode may be provided and a light reflective material may be laminated on the surface.

According to these embodiments, the light L ₂₁ from the outside enters the panel through the optical filter 18 and becomes circularly polarized light L ₂₂ in the right or left direction. The reflection surface of the second electrode 14 etc. reflects. Therefore, the circularly polarized light L ₂₂ is reflected by the reflective surface of the second electrode 14 or the like to become circularly polarized light L ₂₃ in the reverse direction, and since this is cut off by the optical filter 18 , the reflected light is not emitted to the outside.

FIG. 3 is an explanatory view showing an organic EL panel according to another embodiment of the present invention. The same symbols are given to the same parts, and descriptions of overlapping parts are omitted. The basic structure of the organic EL panel 20 according to this embodiment is the same as that of the above-mentioned organic EL element 10 , but the problem is fundamentally solved by making the slope a not face the light emitting side as the diffuse reflection preventing means. That is, the notch 15B is formed on the bottom surface of the sealing recess 15A so that the slope a of the sealing recess 15A does not face the support substrate 11 side, so that the angle between the slope a and the bottom is not a right angle but an acute angle.

In this way, the light L ₃₁ from the outside also enters the panel through the optical filter 18 and becomes circularly polarized light L ₃₂ in the right or left direction, but it is not reflected by the diffuse reflection portion formed by the slope a, but is sealed. The bottom surface of the concave portion 15A or the reflection surface of the second electrode 14 reflects. Therefore, the circularly polarized light L ₃₂ is reflected by the bottom surface of the sealing recess 15A and becomes the circularly polarized light L ₃₃ in the opposite direction. Since this is cut off by the optical filter 18 , the reflected light is not emitted to the outside.

FIG. 4 is an explanatory view showing an organic EL panel according to still another embodiment of the present invention. The same symbols are given to the same parts, and descriptions of overlapping parts are omitted. The basic structure of the organic EL panel 30 according to this embodiment is the same as that of the above-mentioned organic EL elements 10 and 20, but as the diffuse reflection preventing means, by forming The light shielding part 31 is used to solve the problem more fundamentally. That is, the light shielding portion 31 is provided so that the light from the outside does not enter the inclined surface a of the sealing recess 15A, so that the light from the outside does not enter the panel through the optical filter 18 and reach the diffuse reflection portion formed by the inclined surface a, Diffuse light from the inside of the panel is not emitted to the outside. The light-shielding portion 31 can be formed of a sealing material and a member colored in a light-absorbing color, but it is preferably formed of near black or near gray that uniformly absorbs all wavelengths in the visible light region.

A method of manufacturing such organic EL elements 10, 20, 30 will be described below. First, as an element forming step, an organic EL element in which a first electrode 12, an organic layer 13, and a second electrode 14 are laminated is formed on a support substrate 11, and an organic layer 13 including at least a light emitting layer is formed between a pair of electrodes. organic EL elements. Here, for the formation of the organic EL element 12, well-known film-forming steps and patterning steps that are generally employed are employed. Furthermore, on the other hand, the sealing recess 15A is formed by sandblasting, etching, or the like on the sealing member 15 , and the desiccant 17 is attached to the bottom surface of the sealing recess 15A. Then, the sealing member 15 is pasted on the support substrate 11 with an adhesive 16 to form a panel.

In such a manufacturing process, in the embodiment shown in FIG. 2 , in the process of forming the second electrode 14 in the element forming process, the above-mentioned extension portion 14A is formed (when the extension portion is provided on the first electrode 12 Next, the extension portion is formed when the first electrode 12 is formed), and in the embodiment shown in FIG. On the other hand, in the embodiment shown in FIG. 4 , the aforementioned light shielding portion 31 is formed on the surface of the supporting substrate 11 after the forming step of the supporting substrate 11 or the final bonding step.

Next, each constituent member of the above-mentioned organic EL panels 10, 20, 30 and a panel manufacturing method will be described more specifically.

(a) Support substrate

As the supporting substrate 11, a transparent plate-like or film-like article is preferable, and the material may be glass or plastic.

(b) Optical filter

As an example of the optical filter 18, it is composed of a linear polarizing plate and a 1/4λ polarizing plate formed by pasting a plurality of birefringent plates so as to obtain a phase of 1/4 wavelength in a wide wavelength range Difference. And, by making the 1/4λ polarizing plate have a polarizing axis with a crossing angle equal to or equal to 45 degrees with respect to the polarizing axis of the linear polarizing plate, the incident light from the outside passes through the optical filter 18 to become right or left circularly polarized light .

(c) electrode

On the premise that light is emitted from the side of the supporting substrate 11 (bottom emission method), the first electrode 12 may be an anode made of a transparent electrode, and the second electrode 14 may be made of a light-reflective metal electrode. The cathode, but basically it does not matter which side is set as the anode or the cathode (the anode is made of a material with a higher work function than the cathode).

As applicable anode materials, transparent electrodes such as indium oxide (In ₂ O ₃ ), ITO, and IZO, and metal films such as Cr, Mo, Ni, and Pt with higher work functions than the cathode can be used, formed by evaporation, sputtering, etc. Membrane method to form.

As the cathode, metals with small work functions, metal oxides, metal fluorides, alloys, etc. are used. Specifically, single-layer structures such as Al, In, and Mg, and stacked structures such as LiO ₂ /Al can be used. film formation methods such as sputtering. In addition to metals, amorphous semiconductors such as doped polyaniline and doped polyphenylene vinylene, and oxides such as Cr ₂ O ₃ , NiO, and Mn ₂ O ₅ can also be used. When both the first and second electrodes are formed of a transparent material, a reflective film may be provided on the electrode side opposite to the light emitting side.

In the case of making the second electrode 14 a light-reflective electrode and using it to form the extension portion 14A, since the extension portion 14A is used to reflect external light (white light), it is preferable to use a non-colored electrode that reflects the entire visible light region. silver film.

On the other hand, when the first electrode 12 is a transparent electrode and an extension (not shown) is formed using it, a silver film such as Cr may be laminated on the extension to form a reflective surface.

(d) Organic layer

In the case where the first electrode 12 is used as the anode and the second electrode 14 is used as the cathode, the organic layer 13 is generally a stacked structure of hole transport layer/light emitting layer/electron transport layer, but multiple layers of more than one layer may also be provided. For the stacked light-emitting layer, hole transport layer, and electron transport layer, one of the hole transport layer and the electron transport layer may be omitted, or both layers may be omitted and only the light-emitting layer may be provided. In addition, as the organic layer 13, an organic functional layer such as a hole injection layer, an electron injection layer, a hole blocking layer, and an electron blocking layer may be inserted according to the application.

The material of the organic layer 13 can be appropriately selected according to the use of the organic EL element. Examples are listed below, but are not limited thereto.

As the hole transport layer, any material can be selected from conventionally known compounds as long as it has a high hole mobility. As specific examples, hematoporphyrin compounds such as copper phthalocyanine blue, aromatic tertiary amines such as 4,4'-bis[N-(1-naphthyl)-N-phenylamino]-biphenyl (NPB), 4 -Stilbene compounds such as (di-p-tolylamino)-4'-[4-(di-p-tolylamino)styryl]stilbene, or organic materials such as triazole derivatives and styrylamine compounds. In addition, a polymer-dispersed material in which a low-molecular organic material for hole transport is dispersed in a polymer such as polycarbonate can also be used.

Known light-emitting materials can be used for the light-emitting layer. As specific examples, aromatic dimethyl compounds such as 4,4'-bis(2,2'-biphenylvinyl)-biphenyl (DPVBi), 1, 4-bis(2-methylstyryl) benzene and other styrene benzene compounds, 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole ( TAZ) and other triazole derivatives, anthraquinone derivatives, fluorenone derivatives and other fluorescent organic materials, (8-hydroxyquinoline) aluminum complex (Alq ₃ ) and other fluorescent organometallic compounds, polyphenylene vinylene ( Polymer materials such as PPV), polyfluorene (polyfluorolene), polyvinylcarbazole (PVK) and other polymer materials, platinum complexes or iridium complexes, etc., can be used to emit phosphorescence from triplet excitons. 2001-520450). The light-emitting layer may consist of only the above-mentioned light-emitting materials, or may contain hole-transport materials, electron-transport materials, additives (donors, acceptors, etc.), light-emitting dopants, and the like. Alternatively, they may be dispersed in a polymer material or an inorganic material.

The electron transport layer is only required to have the function of transferring electrons injected from the cathode to the light emitting layer, and its material can be selected from conventionally known compounds. As specific examples, organic materials such as nitro-substituted fluorenone derivatives and anthracenomethane derivatives, metal complexes of 8-hydroxyquinoline derivatives, metal phthalocyanine blue, and the like can be used.

The above-mentioned hole transport layer, light-emitting layer, and electron transport layer can be wet-processed by coating methods such as spin coating method and dipping method, printing methods such as spray method and screen printing method, or vapor deposition method and laser transfer printing method. And other dry process to form.

(e) Sealing parts

The material of the sealing member 15 is not particularly limited, but is preferably formed of glass. The sealing recess 15A is formed on the sealing member 15 corresponding to the arrangement of the organic EL elements formed on the supporting substrate 11 (the organic EL elements may be single or plural). A two-stage concave type in which a desiccant-filled pocket (pocket) may be formed in the sealing recess 15A may also be used.

The sealing recess 15A is formed by processing such as punching, etching, sandblasting, etc. for a glass plate, and the sealing recess 15A is formed by molding or the like for a resin plate.

As an example of the aforementioned diffuse reflection portion, it is formed by processing the sealing recess 15A. For example, in the case of sandblasting, a dry film resist (DFR) is formed on the sealing member 15, a portion where the sealing recess 15A is formed is masked with a photomask, and UV light is irradiated to a portion other than the sealing recess 15A. DFR performs exposure and development processing. Then, the sealing recess 15A is formed by blasting with an abrasive material, but since the surface of the slope a of the sealing recess 15A becomes rough, a diffuse reflection part is formed inside the panel. In addition, when the wet etching process is performed, the above-described DFR exposure and development processes form a resist pattern that seals the opening of the concave portion 15A. Afterwards, the sealing recess 15A is formed by etching with the chemical solution hydrofluoric acid, but since the bottom surface near the slope a of the sealing recess 15A is roughened by the chemical solution, the above-mentioned diffuse reflection part is formed.

As the desiccant 17 installed on the bottom surface of the sealing recess 15A, the following desiccants can be used to form: physical desiccants such as zeolite, silica gel, carbon, carbon nanotubes; chemical desiccants such as alkali metal oxides, metal halides, chlorine peroxide, etc. Desiccant; a desiccant in which organic metal complexes are dissolved in petroleum solvents such as toluene, xylene, and aliphatic organic solvents; these desiccant particles are dispersed in transparent polyethylene, polyisoprene, poly Desiccants in adhesives such as polyvinyl silicate (polyvinyl chinate-to), etc.

(f) Adhesive

As the adhesive 16, a thermosetting type, a chemical curing type (two-solvent mixture), or a light (ultraviolet) curing type adhesive is used, and its material can be acrylic resin, epoxy resin, polyester, polyolefin, or the like. In particular, ultraviolet curable epoxy resins are preferably used. An appropriate amount (about 0.1 to 0.5% by weight) of a spacer (preferably a glass or plastic spacer) having a particle diameter of 1 to 100 m is mixed with this adhesive, and coated using a dispenser or the like.

(g) Various forms of organic EL panels

The organic EL element may be formed as a single organic EL element, or may have a desired pattern structure to form a plurality of pixels.

Moreover, in the case of the latter, the display method can be monochromatic light emission, or multicolor light emission with two colors or more than two colors, especially in order to realize an organic EL panel with multicolor light emission, the following methods can be used: Configuration: A method of forming two or more light-emitting functional layers (separate coating method), including a method of forming three types of light-emitting functional layers corresponding to RGB, combining a color filter or a color conversion layer formed of a fluorescent material A method of monochromatic light emitting functional layer such as white or blue (CF method, CCM method), a method of realizing multicolor light emission by irradiating electromagnetic waves to the light emitting region of a monochromatic light emitting functional layer (photofading method), etc. In addition, the driving method of the organic EL element may be either a passive driving method or an active driving method.

(h) Manufacturing method

The organic EL panels 10, 20, and 30 according to the embodiment are manufactured through the following steps: an element forming process of forming an organic EL element on a transparent plate glass support substrate 11; a forming process of the sealing member 15; A sealing step in which the sealing member 15 and the support substrate 11 are pasted together with the agent 16 .

Taking the aforementioned passive drive panel manufacturing as an example, the element forming process forms a first electrode 12 such as ITO as an anode on the supporting substrate 11 into a thin film by evaporation, sputtering, etc., and uses photolithography, etc. Form a ribbon pattern. Then, the organic layer is formed by a coating method such as a spin coating method or a dipping method, a wet process such as a printing method such as a spray method or a screen printing method, or a dry process such as a vapor deposition method or a laser transfer method. As an example, each material of the hole transport layer, the light-emitting layer, and the electron transport layer is sequentially stacked by vapor deposition, and finally a strip-shaped second electrode 14 as a cathode is formed so that it is perpendicular to the first electrode 12. 12 and the second electrode 14 form a matrix. The second electrode 14 is formed by a method such as vapor deposition or sputtering using a stripe pattern mask.

The forming process of the sealing member 15 is to form the sealing recess 15A by processing the sealing member 15 made of glass, such as press molding, etching, and sandblasting, and then attach the desiccant 17 to the bottom surface of the sealing recess 15A using an adhesive or the like. Depending on the situation, the desiccant 17 is covered and fixed with an air-permeable sheet made of cloth, paper, or synthetic resin.

The sealing process is: for example, mixing an appropriate amount (about 0.1 to 0.5% by weight) of a spacer (preferably glass or plastic spacer) with a particle diameter of 1 to 100 m in the ultraviolet curing epoxy resin adhesive 16, using a dispenser, etc. This is applied to a portion of the support substrate 11 corresponding to the bonding surface of the sealing member 15 . Then, the sealing member 15 and the support substrate 11 are brought into butt-joint contact with the adhesive 16 in an inert gas atmosphere such as argon gas. Thereafter, the adhesive 16 is irradiated with ultraviolet rays from the side of the supporting substrate 11 (or the side of the sealing member 15 ) to be cured. In this way, the organic EL element is sealed in a state where an inert gas such as argon gas is sealed in the sealed space between the sealing member 15 and the support substrate 11 .

According to the organic EL panel of this embodiment and its manufacturing method, external incident light entering the panel is not reflected by the diffuse reflection part in the panel, so the optical filter 18 can be provided on the entire panel surface. function of the device. Therefore, there is no disadvantage of reflecting the outside scene when not emitting light, lowering the contrast or becoming unable to display black when emitting light, and almost completely preventing the deterioration of display performance due to external incident light.

Claims (3)

1. An organic electroluminescence panel, an optical filter made of a circular polarizer is arranged on one side of a support substrate, an organic electroluminescence element is formed on the other side of the support substrate, and the organic electroluminescence element It has a first electrode and a second electrode and an organic layer sandwiched between the first and second electrodes, at least one of the first electrode and the second electrode is composed of a transparent electrode, and the organic layer includes at least a light-emitting layer. A sealing member formed with a sealing recess for sealing the organic electroluminescent element is pasted on the other surface, wherein, The sealing member is formed of glass, a desiccant is provided on the bottom surface of the sealing recess, the slope of the sealing recess is a rough surface, On the surface of the support substrate other than the surface on which the optical filter is provided, a diffuse reflection prevention unit is provided, which prevents external incident light entering the organic electroluminescent panel from being affected by the roughness of the sealing recess. surface reflection. 2. The organic electroluminescence panel according to claim 1, characterized in that, As the diffuse reflection preventing means, an extension portion of the first or second electrode formed of a light reflective electrode is provided on the other surface of the support substrate so as to cover the diffuse reflection portion. 3. The organic electroluminescence panel according to claim 1, characterized in that, As the diffuse reflection preventing means, an extension of the first or second electrode made of a transparent electrode is provided on the other surface of the support substrate so as to cover the diffuse reflection part, and on the surface of the extension part A light reflective material is laminated on top.

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