JP2004134099A - Organic el display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL display equipped with a color filter (CF) layer, a color conversion (CCM) layer or the like and eliminating the occurrence of wire breaking at an electrode layer of an upper layer due to a difference in level generated at an end part of the protective layer when coating with the protective layer as much as possible. <P>SOLUTION: The organic EL display 1, of which the difference in level is made even and a wire breaking at an electrode layer of an upper layer is prevented, is realized by laminating a color filter layer 3, a CCM layer 4, and a black matrix layer 5, and further, a first protective layer 6 and a second protective layer 7 continuously coating its circumference and a periphery edge part of its top face, on the substrate 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an organic EL display capable of forming an electrode layer that is less likely to be disconnected by providing an inclined portion for eliminating a step on a substrate provided with the step.
[0002]
[Prior art]
An organic EL element has a structure in which a light emitting layer is interposed between an anode and a cathode in principle. However, when an organic EL display is actually formed using an organic EL element, three primary colors are used. There are several methods besides arranging the organic EL elements that emit light of each color. Typically, (1) a method in which an organic EL element that emits white light is combined with a color filter layer of three primary colors; 2.) There is a method in which an organic EL element emitting blue light is combined with a color conversion layer (CCM layer) for performing color conversion for blue → green and blue → red.
[0003]
In the method (1) in which a color filter layer of the three primary colors is combined, a first electrode layer, a light emitting layer, and a second electrode layer are formed via a protective layer after a color filter layer is provided on a transparent substrate. In the method of (2) combining with a color conversion layer (CCM layer), a color filter layer and a color conversion layer are sequentially provided on a transparent substrate, and then a first electrode layer and a light emitting layer are provided via a protective layer. An organic EL display can be formed by forming the first electrode layer and the second electrode layer. Here, the reason why the formation of the light emitting layer is performed after the formation of the color filter layer and the color conversion layer is to eliminate adverse effects on the light emitting layer when other layers are formed.
[0004]
By the way, prior to forming each layer after the first electrode layer, the reason why the protective layer is formed is that the organic phosphor contained in the light emitting layer can be included in the color filter layer or the color conversion layer even after the formation. This is for preventing deterioration due to a volatile component such as an organic solvent, but by forming the protective layer, a step is generated between a portion where the protective layer is formed and a portion where the protective layer is not formed. Therefore, when the electrode layer is formed on the substrate on which the protective layer is formed, the electrode layer is also formed along the step of the lower layer, so that the electrode layer is likely to be disconnected at the step.
[0005]
Conventionally, when the organic EL element electrode is connected to the extraction electrode, the thickness of the extraction electrode is large, so that a step is generated at the end of the extraction electrode. Therefore, the organic EL formed so as to ride on the end of the extraction electrode. There is a problem of disconnection of the device electrode. It is said that the problem of disconnection in this case is solved by forming a forward tapered portion at the end of the extraction electrode. (For example, refer to Patent Document 1).
[0006]
[Patent Document 1]
JP-A-2000-235890 (Claim 1, FIG. 1)
[0007]
However, the organic EL element in Patent Document 1 does not have a color filter layer, a color conversion layer, and a protective layer associated therewith, and therefore, the protective layer in a portion where the organic EL element is to be formed is formed. No specific measures are taken to eliminate the disconnection based on the step due to the presence or absence, but merely to eliminate the disconnection caused by the step based on the presence or absence of the extraction electrode. Further, the angle of inclination of the forward tapered portion is preferably 45 ° or less, and if it exceeds 45 °, the possibility of disconnection increases.
[0008]
[Problems to be solved by the invention]
In the present invention, before forming each layer after the first electrode layer, it is necessary to cover them with a protective layer in order to have a color filter layer or a color conversion layer. An object of the present invention is to provide an organic EL display in which the occurrence of disconnection caused by a step is minimized. Another object of the present invention is to provide an organic EL display that does not depend on the angle of the forward tapered portion or does not depend as much as possible.
[0009]
[Means to solve the problem]
Initially, the inventor considered a method of forming a gentle slope at the end of the protective layer when forming the protective layer.However, it was difficult to solve the problem. The first protective layer (the first protective layer) is further covered with the second protective layer to continuously cover the periphery of the first protective layer and at least the periphery of the first protective layer. The step caused by the protective layer is smoothed out. As a result, it has been found that disconnection of the electrode layer formed thereon is hard to occur, and if the angle of the end of the second protective layer is 90 ° or less, It has been found that it is possible to form a protective layer having an extremely large margin without disconnection, and the present invention has been achieved.
[0010]
In the first invention, a color filter layer or a color conversion layer is laminated on a substrate, and the protective layer covering the color filter layer or the color conversion layer is formed on the color filter layer or the color conversion layer and the substrate. On the protective layer, at least a first electrode layer, a light emitting layer, and a second electrode layer are laminated on the protective layer from the protective layer side, and the protective layer is A first protective layer, a peripheral portion of the first protective layer, and a second protective layer that continuously covers at least a peripheral portion on the first protective layer from the color conversion layer side. The present invention relates to an organic EL display characterized by being performed.
[0011]
According to a second aspect of the present invention, a color filter layer and a color conversion layer are sequentially stacked on the substrate from the substrate side, and the protective layer covering the color filter layer and the color conversion layer is formed of the color conversion layer. On the substrate and on the substrate, leaving a margin on the substrate, and on the protective layer, at least a first electrode layer, a light emitting layer, and a second electrode layer are laminated from the protective layer side, A second protection layer that continuously covers the first protection layer, a peripheral portion of the first protection layer, and at least a peripheral portion on the first protection layer from the color conversion layer side; The present invention relates to an organic EL display comprising a protective layer.
[0012]
A third invention relates to the organic EL display according to any one of the first and second inventions, wherein the second protective layer covers the entire surface of the first protective layer. It is.
[0013]
In a fourth aspect based on any one of the first to third aspects, the thinnest portion of the protective layer has a thickness of 0.1 μm to 2.0 μm, and covers a peripheral portion of the first protective layer. 4. The organic EL display according to claim 1, wherein the width of the second protective layer is 0.01 mm to 5.0 mm.
[0014]
In a fifth aspect based on any one of the first to fourth aspects, an upper surface of the second protective layer covering a peripheral portion of the first protective layer has a forward tapered shape with respect to the substrate, The present invention relates to an organic EL display having an inclination of 10 ° to 90 °.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 are cross-sectional views of an organic EL display according to an embodiment of the present invention.
[0016]
As shown in FIG. 1, in an organic EL display 1 of the present invention, a black matrix 5 having openings is laminated on a substrate 2, and a color filter layer 3 composed of a group of elements corresponding to each pixel is laminated. On the color filter layer 3, a CCM layer 4 composed of a group of elements corresponding to each element of the color filter layer 4 is laminated. A portion including the color filter layer 3, the CCM layer 4, and the black matrix 5 is referred to as a color conversion unit. Note that the organic EL display 1 according to the present invention has a case where it has both the color filter layer 3 and the CCM layer 4 and a case where it has only one of the color filter layer 3 and the CCM layer 4.
[0017]
A first protective layer 6 is laminated on the color conversion section composed of these elements, and the first protective layer is laminated so as to cover the entire color conversion section. A portion without a color conversion portion is also covered, except that a blank portion on the substrate 2 that is not covered is laminated, and as shown in FIG. There is a step between the portion covered and the portion not covered with the first protective layer 6.
[0018]
As shown in FIG. 1, the end of the first protective layer 6 has a steep slope, which is formed when the first protective layer 6 is formed of resin or the like. This is because the edge often forms a steep slope, but the shape of the edge of the first protective layer 6 is not limited to this, and even if the edge forms a vertical surface. Alternatively, the cross section of the slope may be curved.
[0019]
On the first protective layer 6, a second protective layer 7 is laminated including a peripheral portion of the first protective layer 6. That is, the second protective layer 7 is a portion on the substrate 2 where neither the color conversion portion nor the first protective layer is laminated, and The peripheral portion 6a of the protective layer 6 is continuously covered and laminated, so that the second protective layer 7 has a portion covered with the first protective layer 6 on the substrate 2, The step formed between the portion not covered with the first protective layer 6 and the portion not covered is filled and smoothed.
[0020]
The second protective layer 7 on the peripheral portion 6a of the first protective layer 6 gradually becomes thinner as the distance from the first protective layer 6 increases, and forms an inclined portion 8 having a gentle slope. Lastly, a small slope is formed at the terminal end 9 of the second protective layer 7, but the second protective layer 7 is made smaller in thickness than the first protective layer 6. The height of the slope generated at the end portion 9 of the protective layer 7 can be made sufficiently small.
[0021]
Thickness T of first protective layer 6 ₁ Is preferably 1 μm or more, and can be up to about 100 μm, but is usually 2 μm to 5 μm. The thickness T of the second protective layer 7 ₂ Is the thickness T of the first protective layer 6 ₁ Irrespective of this, it is preferable that the thickness is about 1 μm to 2 μm. Thickness T of first protective layer 6 ₁ Is less than 2 μm, it is not actually necessary to form the second protective layer 7. Note that T ₁ Exceeds the normal range, the thickness T of the second protective layer 7 ₂ Is preferably about 1 μm to 2 μm, and the remainder is preferably the second protective layer 7.
[0022]
The second protective layer 7 also covers the peripheral portion 6a of the first protective layer 6 on the substrate 2, and the width of this portion (substantially the inclined portion 8) is 0.01 mm to It is preferably 5.0 mm, more preferably 0.1 mm to 1.0 mm. If the width is less than 0.01 mm, the effect of filling the step caused by the presence or absence of the first protective layer 6 and smoothing it out becomes poor, and if it exceeds 5.0 mm, the presence or absence of the first protective layer 6 No improvement in the effect of filling in the steps caused by this and smoothing the steps can be seen. In connection with this, the upper surface of the second protective layer 7 covering the peripheral portion of the first protective layer 6 has a forward taper with respect to the substrate 2, and the taper has an inclination of 10 ° to 90 °. It is preferred to have. If the inclination is less than 10 °, it is difficult to form, and if it exceeds 90 °, disconnection tends to occur, which is not preferable.
[0023]
When the inclined portion 8 of the second protective layer 7 forms a forward tapered portion, the portion where the inclined portion 8 and the terminal portion 9 are in contact is the thinnest portion of the protective layer. The thickness of the protective layer at the thinnest portion is preferably from 0.1 μm to 2.0 μm. If the thickness is less than 0.1 μm, it is difficult to form, and if it exceeds 2.0 μm, disconnection due to the use of the liquid at the step may occur.
[0024]
In the above description with reference to FIG. 1, it has been described that the second protective layer 7 is laminated including the entire surface on the first protective layer 6. If the step of the layer 6 is filled to make it gentle, a method of simply filling only the step of the outer peripheral portion 6a of the first protective layer 6 to form a slope may be used.
[0025]
As shown in FIG. 2, the second protective layer 7 is not laminated on the entire surface of the first protective layer 6 of the organic EL display 1 ′, and the second protective layer 7 is laminated mainly on a stepped portion. Alternatively, the second protective layer 7 may be laminated so as to continuously cover the peripheral portion 6 a of the first protective layer and the peripheral portion 6 b on the first protective layer 6. The other points, that is, the point that the color conversion part is provided on the substrate 2 and the first protective layer 6 that covers the color conversion part is laminated, are the same as the contents described with reference to FIG. . In this case, the portion on the first protective layer 6 may be polished or the like to remove the second protective layer 7 formed on the first protective layer 6.
[0026]
The materials constituting each layer of the organic display 1 and the method of forming each layer as described above are as follows.
[0027]
The substrate 2 is usually on the observation side of the organic EL display 1 and is a transparent support for supporting the entire organic display 1. If necessary, a hard coat layer for preventing scratches, an antistatic layer, an anti-contamination layer, an anti-reflection layer, an anti-glare layer, etc. are directly laminated on the observation side, or laminated on a transparent film. Or a function such as a touch panel may be added.
[0028]
The material constituting the substrate 2 is roughly classified into an inorganic plate-shaped transparent base such as glass or quartz glass, an organic (= synthetic resin) plate-shaped transparent base such as an acrylic resin, or a synthetic resin. It is a transparent film-shaped substrate made of. Very thin glass can also be used as the substrate 2. As the substrate 2, it is preferable to use a substrate having a high smoothness on the surface on which the color conversion portion, the light emitting layer, and the like are formed.
[0029]
As the synthetic resin constituting the transparent substrate 2, those made of various resins can be used. Among them, acrylic resins such as polyester resin, polycarbonate resin, polyarylate resin, polyether sulfone resin, and methyl methacrylate resin; Examples thereof include a cellulose resin such as a triacetyl cellulose resin, an epoxy resin, a cyclic olefin resin or a cyclic olefin copolymer resin.
[0030]
The black matrix 5 divides a light-emitting area, prevents reflection of external light at a boundary portion, and enhances the contrast of an image. Usually, the black matrix 5 is composed of thin black lines, and has a vertical and horizontal lattice shape. Alternatively, it is formed in a pattern such as a grid in only one direction. The light emitted from the organic EL display 1 reaches the observation side via the opening of the black matrix 5 and usually includes a color filter layer 3, a CCM layer 4, a first electrode layer, and a light emitting layer. , And the respective layers such as the second electrode layer are formed with reference to the black matrix 5. In addition, although the function as the organic EL display 1 can be achieved without the black matrix 5, it is preferable to provide the black matrix 5 from the above viewpoint.
[0031]
The black matrix 5 is formed of, for example, a patterned thin film of a metal such as chrome, or a solidified material of a black ink. The former can be obtained by forming a thin film of a metal such as chromium on the washed substrate 2 by vapor deposition or sputtering or the like, and patterning the thin film by photolithography or the like, or by electroless plating. It may be by law. The latter can also be formed by utilizing a printing method using a black ink composition or the like. The thickness of the black matrix 5 is about 0.2 μm to 0.4 μm when it is formed as a thin film, and about 0.5 μm to 2 μm when a printing method is used.
[0032]
The CCM layer 4 is used in combination with an organic EL element that emits blue light, and is configured by regularly arranging three types of areas for red, green, and blue for each pixel, The red area converts incident light from the organic EL element, for example, blue light, from blue to red, and the green area converts blue light from the organic EL element from blue to green. It is a thing. In addition, since the area for blue does not need to perform color conversion in principle, nothing is provided, or a colorless transparent layer is formed in the sense of preventing a concave portion due to nothing. You may leave.
[0033]
When the black matrix 5 is provided in advance, each part of the CCM layer 4 is provided in the opening of the black matrix 5, but, for example, it is provided in a band shape from the near side to the back side in FIG. 1 or FIG. Is also good. The same applies to a color filter layer described later.
[0034]
The red area and the green area of the CCM layer 4 are made of a composition in which the above-described red conversion phosphor or green conversion phosphor for performing each color conversion is dissolved or dispersed in a resin.
[0035]
Examples of the red conversion phosphor include cyanine dyes such as 4-dicyanomethylene-2-methyl-6- (p-dimethylaminostyryl) -4H-pyran, and 1-ethyl-2- [4- (p-dimethyl). Examples thereof include pyridine dyes such as [aminophenyl) -1,3-butadienyl] -pyridium-perchlorate, rhodamine dyes such as rhodamine B and rhodamine 6G, and oxazine dyes.
[0036]
Examples of the green conversion phosphor include 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethylquinolizino (9,9a, 1-gh) coumarin and 3- (2′-benzothiazolyl) -7. Coumarin dyes such as -diethylaminocoumarin or 3- (2'-benzimidazolyl) -7-N, N-diethylaminocoumarin, coumarin dyes such as Basic Yellow 51, or Solvent Yellow 11 or Solvent Yellow 116 Naphthalimide dyes and the like can be mentioned.
[0037]
The CCM layer 4 is formed by mixing the above-mentioned red conversion phosphor or green conversion phosphor with a photosensitive resin, if necessary, a solvent, a diluent, a monomer or the like, and further, an appropriate additive. After forming a photosensitive resin composition for forming each area, these photosensitive resin compositions are uniformly applied, dried, and then subjected to a predetermined pattern exposure, and then a process of developing each color is performed. This can be done by repeating each time. Alternatively, it may be performed by forming and using an ink composition colored in a predetermined color and printing for each color. The blue area can be formed by using the above-described photosensitive resin composition or ink composition except for each color conversion phosphor. The thickness of the CCM layer 4 is about 2 μm to 20 μm.
[0038]
In the color filter layer 3, fine areas of three primary colors of red, green, and blue are regularly arranged corresponding to each pixel. The formation of the color filter layer 3 is performed, for example, by uniformly applying a photosensitive resin composition colored in each color, drying the photosensitive resin composition, performing a predetermined pattern exposure, and then performing a developing process for each color. It is carried out by repeating, or by forming and printing an ink composition colored in each color. The thickness of the color filter layer 3 is about 1 μm to 2 μm.
[0039]
The color filter layer 3 is originally used in a method in which the above-described (1) organic EL element emitting white light is combined with a color filter layer of three primary colors, but the above-mentioned (2) the organic EL element emitting blue light is used. Also, in the method of combining the CCM layer and the CCM layer, it can be used in combination with the CCM layer 4 for the purpose of color correction after color conversion, blue correction in the blue area, and the like.
[0040]
The first protective layer 6 has a role of an object on which each layer thereon is laminated, and has a role of blocking the organic EL element from each of the underlying layers, particularly the CCM layer 4, and is made of a transparent resin. . Further, the first protective layer 6 also plays a role of improving a step on the surface of the CCM layer 4.
[0041]
Examples of the transparent resin constituting the first protective layer 6 include polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, polyvinyl chloride resin, melamine A transparent resin such as a resin, a phenol resin, an alkyd resin, an epoxy resin, a polyurethane resin, a polyester resin, a maleic acid resin, or a polyamide resin can be given. Alternatively, as the resin, an ionizing radiation curable resin having a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber (actually, an electron beam curable resin or an ultraviolet curable resin) Resin, which is often the latter, and may be hereinafter referred to as a photosensitive resin or a photosensitive resin composition). In addition, the transparent resin mentioned here can also be used for the photosensitive resin composition or the ink composition when forming the CCM layer 4.
[0042]
The first protective layer 6 is formed using a coating composition obtained by mixing the above transparent resin with a solvent, a diluent, a monomer, or the like, if necessary, and further, an appropriate additive. After coating and drying in the same manner, by curing by irradiating with ionizing radiation, or after forming a normal coating composition that is not ionizing radiation-curable, after applying by an appropriate coating means or printing means Can be formed by drying. In order to form the first protective layer 6 in conformity with the outer shape of the lower color filter layer 3 and the CCM layer 4, in addition to printing such as silk printing, a coating composition is prepared using a photosensitive resin composition. After application, it is preferable to form a predetermined pattern by pattern exposure and development.
[0043]
The material forming the second protective layer 7 is basically the same as the material forming the first protective layer 6. As a method for forming the second protective layer 7, a coating composition is prepared in the same manner as when the first protective layer 6 is formed, and is applied over the entire surface and then subjected to pattern exposure and development, or screen printing. It can be formed in a pattern by a printing method such as a printing method or an application method of a coating composition such as an inkjet method.
[0044]
A transparent barrier layer may be laminated on the second protective layer 7 as needed. The transparent barrier layer is preferably made of a thin film of an inorganic oxide, and can block transmission of air, particularly water vapor, from below to an organic EL element provided as an upper layer. Examples of the inorganic oxide include silicon oxide, aluminum oxide, and titanium oxide. The thickness of the transparent barrier layer is about 0.03 μm to 3 μm.
[0045]
In this way, the color conversion layer including the color filter layer 3, the CCM layer 4, or the 5 black matrix is laminated on the substrate 2, and the first and second protective layers cover the color conversion section and surround the color conversion section. An organic EL display is formed by forming a first electrode layer, a light emitting layer, a second electrode layer, and the like on an inclined portion 8 having a gentle slope. In the present invention, disconnection of the first electrode layer and the second electrode layer is prevented.
[0046]
The first electrode layer is usually an anode made of a transparent material, and individual electrodes having a band shape having a width corresponding to the width of the opening of the lower black matrix 5 are arranged, for example, in the left-right direction of the drawing, The black matrix 5 is arranged at the pitch of the apertures in the direction from the front to the back of the drawing.
[0047]
The first electrode layer is made of, for example, a thin film of a metal oxide having transparency and conductivity, and specifically includes indium tin oxide (ITO), indium oxide, zinc oxide, or stannic oxide. And the thickness is preferably about 10 nm to 500 nm. The first electrode layer is preferably formed by forming a uniform thin film of the metal oxide as described above and then removing unnecessary portions by photoetching.
[0048]
On the first electrode layer, in principle, a light emitting layer and a second electrode layer are laminated, but preferably, an insulating layer and a partition are provided.
[0049]
The insulating layer is provided corresponding to the non-opening portion of the lower black matrix 5 and may be formed in a stripe shape in only one direction, but is preferably formed in a vertical and horizontal lattice shape. The insulating layer can be made of, for example, the same material as the first protective layer 6 already described, and the insulating layer is patterned by photolithography or printing.
[0050]
The partition is provided over the insulating layer and serves as a mask when the light-emitting layer and the second electrode layer are formed by a vapor phase method such as an evaporation method. The partition walls are provided, for example, in parallel in a direction from the front to the back of the figure, and can be provided by pattern exposure and development of a photosensitive resin.
[0051]
The light-emitting layer is, as the simplest, formed of an organic phosphor that emits blue light by emitting fluorescence. However, in addition to the single layer of the organic phosphor layer, the first electrode of the organic phosphor layer may be used. One having a hole injection layer on the layer side, one having an electron injection layer on the second electrode layer side of the organic phosphor layer, or one having a hole injection layer on the first electrode layer side of the organic phosphor layer And various laminated structures such as an electron injection layer provided on the second electrode layer side. As long as blue light emission can be obtained, a laminated structure other than these may be used.
[0052]
Examples of the organic phosphor that emits blue light include benzothiazole-based, benzimidazole-based, and benzoxazole compounds that can emit blue to blue-green light, and are exemplified in JP-A-8-279394. Fluorescent brighteners, metal chelated oxinoid compounds disclosed in JP-A-63-295695, and styrylbenzene-based compounds disclosed in EP0319881 and EP0375582. And distyrylpyrazine derivatives disclosed in JP-A-2-252793, and aromatic dimethylidin-based compounds disclosed in European Patent No. 0388768 and JP-A-3-231970. .
[0053]
Examples of the organic phosphor that emits blue light include a compound represented by the general formula (Rs-Q) 2-AL-OL described in Japanese Patent Application Laid-Open No. 258882/1993. , L is a hydrocarbon of 6 to 24 carbon atoms containing a benzene ring, OL is a phenylate ligand, Q is a substituted 8-quinolinolate ligand, and Rs is an aluminum atom substituted with 8- Represents an 8-quinolinolate ring substituent selected to sterically hinder the binding of two or more quinolinolate ligands.) Specifically, bis (2-methyl-8-quinolinolate) (para-phenylphenolate) aluminum (III), bis (2-methyl-8-quinolinolate) (1-naphtholate) aluminum (III), and the like are given. be able to.
[0054]
The thickness of the light emitting layer that is made of the materials exemplified above and emits blue light is not particularly limited, but may be, for example, about 5 nm to 5 μm.
[0055]
The second electrode layer forms one electrode for causing the light emitting layer to emit light, and is preferably made of a metal, an alloy, or a mixture thereof having a work function as small as about 4 eV or less. Specifically, sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al ₂ O ₃ ) Mixtures, indium or lithium / aluminum mixtures, rare earth metals, etc., more preferably magnesium / silver mixtures, magnesium / aluminum mixtures, magnesium / indium mixtures, aluminum / aluminum oxide (Al ₂ O ₃ ) Mixtures or lithium / aluminum mixtures.
[0056]
Such a second electrode layer preferably has a sheet resistance of several hundreds Ω / cm or less, and has a thickness of preferably about 10 nm to 1 μm, more preferably about 50 to 200 nm.
[0057]
If necessary, a sealing layer can be laminated on the second electrode layer for the purpose of protecting the above layers, and the sealing layer is used as an adhesive layer and further covered with a transparent substrate similar to the substrate 2. May be.
[0058]
【The invention's effect】
According to the first aspect of the present invention, the second protective layer is laminated on the first protective layer laminated on the color filter layer or the color conversion layer, so that the end of the first protective layer is formed. Since the step is eliminated, it is possible to provide an organic EL display in which the disconnection of the first and second electrode layers on the protective layer due to the step of the protective layer is eliminated.
[0059]
According to the second aspect of the present invention, the color filter layer and the color conversion layer are laminated, and the second protective layer is laminated on the first protective layer laminated on those layers. Since the step at the end of the protective layer is eliminated, it is possible to provide an organic EL display in which the disconnection of the first and second electrode layers on the protective layer due to the step of the protective layer has been eliminated. .
[0060]
According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, it is possible to provide an organic EL display in which the protective layer is further planarized.
[0061]
According to the invention of claim 4, in addition to the effect of any one of claims 1 to 3, the thickness of the terminal portion of the protective layer and the thickness of the second protective layer covering the peripheral portion of the first protective layer Provided is an organic EL display capable of ensuring the protection effect of the protective layer because the width is specified, and effectively reducing disconnection even if the cross section of the terminal portion of the protective layer has a high-angle inclination. can do.
[0062]
According to the fifth aspect of the invention, in addition to the effects of any one of the first to fourth aspects, the inclination of the second protective layer covering the peripheral portion of the first protective layer is defined, so that the formation of the second protective layer is restricted. An organic EL display which can be effectively reduced without any problem can be provided.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an organic EL display of the present invention.
FIG. 2 is a sectional view showing another organic EL display of the present invention.
[Explanation of symbols]
1 Organic EL display
2 Substrate
3 Color filter layer
4 CCM layer
5 Black Matrix
6 First protective layer
7 Second protective layer
8 Inclined part
9 First electrode layer

Claims (5)

A color filter layer or a color conversion layer is laminated on a substrate, and a protective layer covering the color filter layer or the color conversion layer is formed on the color filter layer or the color conversion layer, and on the substrate, on the substrate. And at least a first electrode layer, a light-emitting layer, and a second electrode layer are laminated on the protective layer from the protective layer side, and the protective layer is disposed on the color conversion layer side. It is characterized by comprising a first protective layer, a second protective layer that continuously covers at least a peripheral portion of the first protective layer, and at least a peripheral portion on the first protective layer. Organic EL display. On the substrate, from the substrate side, a color filter layer and a color conversion layer are sequentially stacked and laminated, and a protective layer covering the color filter layer and the color conversion layer is provided on the color conversion layer and the substrate. , Laminated on the substrate leaving a blank, on the protective layer, at least a first electrode layer, a light emitting layer, and a second electrode layer are laminated from the protective layer side, the protective layer, A first protective layer, a peripheral portion of the first protective layer, and a second protective layer that continuously covers at least a peripheral portion on the first protective layer from the color conversion layer side; An organic EL display. 3. The organic EL display according to claim 1, wherein the second protective layer covers the entire surface of the first protective layer. The thickness of the thinnest part of the protective layer is 0.1 μm to 2.0 μm, and the width of the second protective layer covering the periphery of the first protective layer is 0.01 mm to 5.0 mm. The organic EL display according to claim 1, wherein: The upper surface of the second protective layer covering the periphery of the first protective layer is forward tapered with respect to the substrate, and has an inclination of 10 to 90 degrees. The organic EL display according to claim 4.

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