JP2004039311A - Organic multi-color luminescent display device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic multi-color luminescent display element of a color conversion type that maintains a stable light-emitting property over a long period of time and has an excellent visual field angle property. <P>SOLUTION: The organic multi-color luminescent display element in which a color conversion filter layer at least made patterned is laminated on a transparent support substrate and a flattening layer is formed on it, and a passivation layer is formed on the flattening layer, and a transparent lower electrode made patterned is formed on the passivation layer, and an organic luminous layer is laminated so as to cover this transparent lower electrode, and an upper electrode and a sealing member are formed on this luminous layer, is characterized in that a second passivation layer is formed between the above transparent lower electrodes. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an organic multicolor light-emitting display device that enables high-definition multicolor display with excellent environmental resistance and productivity. For more details, organic multicolor light emission suitable for display units of image sensors, personal computers, word processors, televisions, facsimiles, audio, video, car navigation, electric desk calculators, telephones, portable terminals, and industrial instruments The present invention relates to a display element, in particular, an organic multicolor light emitting display element using a color conversion method and a method of manufacturing the same.
[0002]
[Prior art]
In recent years, with the diversification of information, display devices in the information field, such as solid-state imaging devices, have been required to have “beauty, lightness, thinness, and excellence”. Toward low power consumption and high-speed response Active development is underway. In particular, research and development of high-definition full-color display devices have been widely performed.
[0003]
As is well known, in the latter half of 1980, Tang et. ² It has been reported that the above high luminance can be obtained (organic electroluminescence (hereinafter referred to as organic EL)) (Appl. Phys. Lett., 51, 913 (1987)). Research is being actively conducted. Further, similar devices using organic polymer materials are also being actively developed.
[0004]
Organic EL elements are superior to liquid crystal display elements in characteristics such as viewing angle dependence and high-speed response. Further, since a high current density can be realized at a low voltage, higher light emission luminance and light emission efficiency can be expected as compared with inorganic EL elements and LEDs.
[0005]
The characteristics of the organic EL element as a display element include (i) high luminance and high contrast, (ii) low voltage driving and high luminous efficiency, (iii) high resolution, and (iv) high resolution. It has characteristics such as visual field, (v) fast response speed, (vi) miniaturization and colorization, and (ii) excellent lightness and thinness. In view of the above, the organic EL element is expected to be applied to a "beautiful, light, thin, and excellent" flat panel display.
[0006]
Pioneer Corporation has already commercialized a green monochrome organic EL display for use in vehicles since November 1997. In the future, in order to meet the needs of diversifying societies, long-term stability, high-speed response, and multi-color display Practical use of an organic EL multi-color display element capable of display and high-definition full-color display is urgent.
[0007]
As a method for producing a multi-color or full-color organic EL multi-color display element, a method of separately arranging luminous bodies of three primary colors, red and blue, in a matrix and emitting light respectively (JP-A-57-157487, JP-A-57-487487, Japanese Patent Application Laid-Open No. 58-147989, Japanese Patent Application Laid-Open No. 3-214593, and the like. When colorization is performed using an organic light-emitting element, three kinds of light-emitting materials for RGB must be arranged in a matrix with high definition, which is technically difficult and cannot be manufactured at low cost. Further, since the three light emitting materials have different lifespans, there is a drawback that the chromaticity shifts with time.
[0008]
Also, a method of transmitting three primary colors using a backlight emitting white light and a color filter (Japanese Patent Application Laid-Open Nos. 1-315988, 2-273496, 3-194895, etc.) is known. However, a long-life, high-luminance white organic light-emitting element required for obtaining high-luminance RGB has not yet been obtained.
[0009]
There is also known a method in which light emitted from a light-emitting body is absorbed by phosphors which are separately arranged in a plane, and each phosphor emits multicolored fluorescence (Japanese Patent Laid-Open No. 152897/1991). The method disclosed herein for emitting multicolored fluorescent light from a certain light emitter using a fluorescent material is also applied to CRTs, plasma displays, and the like.
[0010]
Further, in recent years, a color conversion method has been disclosed in which a fluorescent material that absorbs light in a light emitting region of an organic light emitting element and emits fluorescent light in a visible light region is used for a filter (Japanese Patent Application Laid-Open Nos. 3-152897 and 3-152897). No. 5-258860). In this method, the emission color of the organic light emitting element is not limited to white, so that an organic light emitting element having higher luminance can be applied to the light source. In a color conversion method using a blue light emitting organic light emitting element (Japanese Patent Application Laid-Open Nos. Hei 3-152897, Hei 8-286033 and Hei 9-208944), a blue light is emitted using a fluorescent material. The wavelength is converted to green light or red light. By patterning the fluorescence conversion film containing such a fluorescent dye with high definition, a full-color light-emitting display can be constructed even when a weak energy ray such as near-ultraviolet light or visible light of a light emitter is used.
[0011]
As a method of patterning a color conversion filter, as in the case of (a) the inorganic phosphor, a fluorescent dye is dispersed in a liquid resist (photoreactive polymer), and after this is formed into a film by a spin coating method or the like. A method of patterning by a photolithographic method (JP-A-5-198921, JP-A-5-258860), or (b) dispersing a fluorescent dye or a fluorescent pigment in a basic binder, and etching this with an acidic aqueous solution. (Japanese Unexamined Patent Application Publication No. 9-208944).
[0012]
In general, what is important for practical use as a color display is not only a fine color display function but also stable light emission characteristics for a long period of time (functional materials, Vol. 18, No. 2). , 96-). However, the organic EL element has a drawback that when driven for a certain period, the light-emitting characteristics such as current-luminance characteristics are significantly reduced.
[0013]
A typical cause of the deterioration of the light emission characteristics is the growth of dark spots. The dark spot is a light emission defect point.
[0014]
This dark spot is considered to be caused by oxidation or aggregation of the element laminated constituent material due to oxygen and moisture in the element, and its growth proceeds during energization as well as during storage, in particular, (B) Accelerated by oxygen and moisture existing around the element, (ii) influenced by oxygen and moisture existing as adsorbed substances in the organic laminated film, and (iii) moisture adsorbed on the parts when the element is manufactured. It is also considered to be affected by water infiltration at the time of manufacture. In order to obtain the long-term stable light emission characteristics described above, it is necessary to sufficiently suppress the growth of dark spots.
[0015]
As described above, the color conversion filter is obtained by mixing a color conversion dye in a resin, and cannot be dried at a temperature exceeding 200 ° C. due to the problem of thermal stability of the mixed dye. Therefore, there is a high possibility that the color conversion filter is formed in a state where the water contained in the coating liquid and the water mixed during the pattern forming step are held. The moisture retained in the color conversion filter or the moisture that reaches the sealing region through the protective layer during storage or driving is a factor that promotes the growth of dark spots.
[0016]
In order to suppress the growth of dark spots, it is conceivable to remove moisture. As a drying means, a method of disposing phosphorus pentoxide as a drying agent in the internal space of the element and sealing it in a hollow state (Japanese Patent Laid-Open No. 3-26191 / 1991). JP-A-7-169567, and a structure in which a protective layer containing phosphorus pentoxide and a sealing layer are further laminated. However, in these methods, phosphorus pentoxide, which is a desiccant, absorbs water and becomes phosphoric acid, which may adversely affect the organic laminate. In addition, a method of filling an inert liquid containing a desiccant on the laminate and an airtight container (Japanese Patent Laid-Open No. 5-41281, 9-35868), a method using a pressure-sensitive adhesive (USP-5) .304.419) have been proposed, but have not been sufficiently solved.
[0017]
As described above, in order to obtain long-term stable light-emitting characteristics of the organic multicolor light-emitting display element, it is necessary to sufficiently suppress the growth of dark spots.
[0018]
FIG. 5 shows an example of a laminated structure of a conventional color conversion type organic multicolor light emitting display element in which the generation of dark spots is suppressed. As shown in the figure, a color filter layer (52R, 52G, 52B) and a color conversion layer (53G, 53B) of three primary colors are arranged on a transparent support substrate 51. Although it is possible to provide a color conversion layer for blue, it is generally sufficient to provide a color filter layer. A black mask 54 is provided between the color conversion filter layers (collectively referred to as a color filter layer and a color conversion layer) for each color, and covers the color conversion filter layer and the black mask to protect and flatten the color conversion filter layer. , A flattening layer 55 is provided. A passivation layer 56 is laminated on the flattening layer 55 in order to prevent moisture or oxygen from the color conversion filter layer from entering the light emitting portion. An organic EL light emitting element including a transparent lower electrode 57, an organic EL light emitting layer 58, and an upper electrode 59 is formed on the passivation layer 56, and a support substrate 60 is formed thereon as a sealing member. An organic multicolor light emitting display device of the type has been obtained. The transparent lower electrode 57 and the upper electrode 59 are formed in line patterns separated at a predetermined interval, and these line patterns are formed to extend in directions orthogonal to each other. Note that a flattening layer using a polyimide resin or the like may be formed in the gap between the transparent lower electrodes 57. Further, there is a configuration in which a thin film is formed instead of the support substrate 60 to achieve the sealing purpose, and the support substrate 60 is not always used as a sealing member.
[0019]
As shown in FIG. 5, in the conventional color conversion type organic multicolor light emitting display device, a passivation layer 56 is formed below the organic EL light emitting layer 58 and the transparent lower electrode 57, and a color filter is formed thereunder. A layer 52 and a color conversion layer 53 are provided. As described above, the color filter layer 52 and the color conversion layer 53 are each obtained by mixing a filter dye or a color conversion dye in a resin, and the color conversion layer is dried at a temperature exceeding 200 ° C. Therefore, there is a high possibility that the color filter layer 52 and the color conversion layer 53 are formed in a state in which the water contained in the coating liquid and the water mixed in the pattern forming step are held. The moisture retained in the color filter layer 52 and the color conversion layer 53 reaches the organic EL light emitting layer 58 during storage or driving of the device, and promotes the growth of dark spots in the light emitting layer 58. Such intrusion of moisture into the organic light emitting layer 58 is blocked by the passivation layer 56, thereby preventing a dark spot from being generated in the light emitting layer 58.
[0020]
However, it has been found that even in a display element having such a structure, a dark spot is generated over time and grows.
[0021]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problem, and prevents an organic multicolor light-emitting display element from invading moisture, which causes a deterioration in characteristics, into a light-emitting portion, and maintains an organic light-emitting characteristic that is stable over a long period of time. It is an object to realize and provide a multicolor light emitting display element.
[0022]
[Means for Solving the Problems]
The present inventors diligently searched for the cause of dark spots occurring over time in the conventional organic multicolor light emitting display device shown in FIG. 5, and found that the following phenomena occurred. Reached.
[0023]
Many devices having the structure shown in FIG. 5 were prepared, and they were subjected to an aging test. When a dark spot was generated, the generation state was measured. As a result, the dark spot is mainly generated in the light emitting layer region between the transparent lower electrode 57 and another adjacent transparent lower electrode 57, and hardly occurs in the light emitting layer region above the transparent electrode 57. It has been found.
[0024]
In pursuit of the cause of the selectivity of the dark spot generation region, the transparent lower electrode 57 is made of an inorganic material such as ITO or IZO. Since the light-emitting layer has a characteristic that is difficult to perform, that is, the same passivation characteristic as that of the passivation layer 56 stacked thereunder, the light-emitting layer region above the transparent lower electrode 57 is simply described as another region. It was found that the film was protected by a moisture barrier property that was about twice that of the above.
[0025]
Even when a flattening layer was formed between the transparent lower electrodes, a dark spot was observed over time in the light emitting region above the flattening layer. This was thought to be due to the fact that materials such as polyimide resin forming the flattening layer did not have passivation characteristics.
[0026]
Therefore, an element sample in which an insulating material having the same passivation characteristics as the lower passivation layer 56 was laminated between the transparent lower electrodes was prepared and subjected to an aging test. As a result, generation and growth of dark spots were observed. Did not.
[0027]
The present invention has been made based on such knowledge, and the organic multicolor display element according to the present invention has a structure in which at least a patterned color conversion filter layer is laminated on a transparent support substrate, and is flattened thereon. A passivation layer is formed, a passivation layer is formed on the flattening layer, a patterned transparent lower electrode is formed on the passivation layer, and an organic light emitting layer is laminated so as to cover the transparent lower electrode. An organic multicolor light-emitting display device in which an upper electrode and a sealing member are formed on the organic light-emitting layer, wherein a second passivation layer is formed between the transparent lower electrodes. I do.
[0028]
Further, a first configuration of the method for manufacturing an organic multicolor light emitting display element according to the present invention includes a step of stacking at least a color conversion filter layer on a transparent support substrate, patterning the layer, and forming a flattening layer thereon. Is formed, a passivation layer is formed on the planarization layer, a transparent lower electrode layer is laminated on the passivation layer, and the layer is patterned to form a transparent electrode. A second passivation layer, an organic light emitting layer stacked so as to cover the transparent electrode and the second passivation layer, and an upper electrode and a sealing member formed on the organic light emitting layer. And
[0029]
Further, a second configuration of the method for manufacturing an organic multicolor light emitting display element according to the present invention is such that at least a color conversion filter layer is laminated and patterned on a transparent support substrate, and a flattening layer is formed thereon. Is formed, a passivation layer is formed on the planarization layer, a patterned groove is formed in the passivation layer, and a transparent lower electrode layer is stacked so as to fill the groove, and the transparent lower electrode and the transparent lower electrode are formed. An organic light emitting layer is laminated so as to cover a passivation layer between the electrodes, and an upper electrode and a sealing member are formed on the organic light emitting layer.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
In the organic multicolor light-emitting display device according to the present invention, the second passivation layer may be made of the same material as the first passivation layer. As a manufacturing method in that case, a first passivation layer is formed, a patterned transparent lower electrode layer is formed thereon, and the same material as that constituting the first passivation layer between the transparent lower electrodes is used. And a passivation layer formed on the flattening layer on the color conversion filter layer, which is thicker than the conventional technology and is formed on a substantially conventional passivation layer. Laminated to about the total thickness of the transparent lower electrode layer, a patterned groove is formed on top of this passivation layer with a depth of about the thickness of the conventional transparent lower electrode layer, and the electrode is filled so as to fill this groove. A second method for obtaining a second passivation layer continuous with the passivation layer between the transparent lower electrodes by stacking materials is conceivable.
[0031]
In the device of the present invention, the second passivation layer may be composed of an insulating inorganic compound, or may be composed of a lower layer composed of an insulating organic compound and an upper layer composed of an insulating inorganic compound.
[0032]
As the insulating inorganic compound constituting the second passivation layer, titanium oxide or black diamond-like carbon is preferable, but other conventional insulating inorganic compounds can be used.
[0033]
Further, an insulating inorganic compound can be used as the passivation layer formed over the planarizing layer, and the insulating inorganic compound includes silicon oxide, aluminum oxide, titanium oxide, silicon oxide, silicon nitride, and It is preferable to select from the group consisting of black diamond-like carbon.
[0034]
The optical properties of the second passivation layer are preferably such that the second passivation layer does not transmit light from the organic light emitting layer. For this purpose, the second passivation layer has a refractive index of 1.8 or more, It is preferably black.
[0035]
In the present invention, when the display light emission structure is a top emission structure, the substrate on which the color conversion filter layers corresponding to the three primary colors are stacked needs to be transparent in the visible region, such as glass or polyester. Of polymers.
[0036]
Further, as the color conversion filter layer, a case where the color conversion layer is constituted by a single layer, a case where the color conversion layer is formed by a single layer, and a case where the color conversion layer is constituted by a laminate of a color filter layer and a color conversion layer, These are collectively called a color conversion filter layer. As for the color conversion filter layer, a laminated structure of a color filter layer and a color conversion layer is generally used for green and red, and only a color filter layer is used for blue.
[0037]
Further, as the flattening layer, any material may be used as long as it can form a coating film on the color conversion filter smoothly and does not deteriorate the function of the color conversion filter. For example, an imide-modified silicone resin, an epoxy-modified acrylate as a UV-curable resin A resin, a resin having a reactive vinyl group of an acrylate monomer / oligomer / polymer, a resist resin, an inorganic compound film formed by a sol-gel method, a photocurable resin such as a fluororesin, and / or a thermosetting resin; Can be mentioned.
[0038]
Further, IZO or ITO is generally used as the transparent lower electrode. Since IZO and ITO used for the transparent lower electrode have a high work function, they are usually suitable for use as an anode, but may be used as a cathode. When the transparent lower electrode is used as a cathode, a layer of a material having a small work function may be provided between the transparent lower electrode and the organic EL light emitting layer to improve the electron injection efficiency. Examples of the material having a small work function in this case include alkali metals such as lithium and sodium; alkaline earth metals such as potassium, calcium, magnesium and strontium; electron-injecting metals such as fluorides thereof; and other metals. And an alloy or a compound thereof. In order to improve the electron injection efficiency, a layer of a material having a small work function with a thickness of 10 nm or less is sufficient, and is also preferable from the viewpoint of maintaining required transparency.
[0039]
In the organic multicolor light emitting display element of the present invention, the organic EL light emitting layer includes at least the organic light emitting layer, and if necessary, a hole injection layer, a hole transport layer, an electron transport layer, and / or an electron injection layer. With a structure interposed. Specifically, those having the following layer configuration are employed (however, the anode is connected to the organic light emitting layer or the hole injection layer, and the cathode is connected to the organic light emitting layer or the electron injection layer).
(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 injection layer / hole transport layer / organic light emitting layer / electron injection layer
(6) hole injection layer / hole transport layer / organic light emitting layer / electron transport layer / electron injection layer
[0040]
Known materials are used as the materials of the respective layers. In order to obtain blue to blue-green light emission, in the organic light-emitting layer, for example, benzothiazole-based, benzimidazole-based, benzoxazole-based fluorescent whitening agent, metal chelated oxonium compound, styrylbenzene-based compound And aromatic dimethylidin compounds are preferably used. Examples of the electron injection layer include a quinoline derivative (for example, an organometallic complex having 8-quinolinol as a ligand), an oxadiazole derivative, a perylene derivative, a pyridine derivative, a pyrimidine derivative, a quinoxaline derivative, a diphenylquinone derivative, and nitro substitution. A fluorene derivative or the like can be used.
[0041]
The upper electrode formed on the organic EL light emitting layer is formed in a line pattern separated at a predetermined interval in order to perform passive matrix driving, and the line pattern is different from the line pattern of the transparent lower electrode. Extends in orthogonal directions. By forming in this manner, when a voltage is applied to one of the line patterns of the transparent lower electrode and one of the line patterns of the upper electrode, it is possible to cause the organic EL light emitting layer at the intersection of the two to emit light. Become.
[0042]
The upper electrode is required to have a high carrier injection property to the organic EL light emitting layer and to reflect light emitted from the organic EL light emitting layer toward the substrate. When the upper electrode is used as an anode, the upper electrode is formed of a material having a large work function in order to improve hole injection properties. Suitable materials include transparent conductive oxides such as ITO or IZO. In this case, it is preferable to provide a reflective metal layer (for example, Al or the like) on the upper electrode and reflect light emitted from the organic EL light emitting layer toward the substrate. When the upper electrode is used as a cathode, the upper electrode is formed of a material having a small work function in order to impart electron injection properties. Suitable materials include alkali metals such as lithium and sodium; alkaline earth metals such as potassium, calcium, magnesium and strontium; electron-injecting metals such as fluorides thereof; and alloys or compounds with other metals. Including. Although not essential, in this case also, the reflectivity may be increased by providing a reflective metal layer (eg, Al) on the upper electrode.
[0043]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0044]
FIG. 1 is a schematic sectional configuration diagram of an organic multicolor light emitting display element according to the present invention. In the figure, the same components as those shown in FIG. 5 are denoted by the same reference numerals, and the description will be simplified.
[0045]
The feature of the organic multicolor light-emitting display device according to the present invention is that the second passivation layer 70 is formed between the patterned transparent lower electrodes 57 formed on the passivation layer 56.
[0046]
The other configuration is the same as the conventional configuration and the forming method is also the same, so that the description thereof is omitted. As described above, there is a configuration in which a thin film is formed in place of the support substrate 60 used as a sealing member to achieve the sealing purpose. Therefore, in the present invention, the support substrate 60 is necessarily used as the sealing member. Not necessarily.
[0047]
As a method of manufacturing the second passivation layer 57, which is a feature of the present invention, the following two methods can be considered.
[0048]
In the first method, as shown in FIG. 2, after forming a first passivation layer 56 by a conventional method, a transparent lower electrode layer is formed thereon, and a photoresist mask 80 is formed thereon in a pattern. Then, the transparent lower electrode 57 is formed by etching using a photolithography method. Thereafter, a passivation material is deposited by sputtering using the mask 80. When the space between the electrodes 57 can be filled with the sputtering material, the mask 80 and the passivation deposition layer thereon are removed (lift-off). As a result, a second passivation layer 70 is formed between the electrodes 57. After that, the organic light emitting layer 58, the upper electrode layer 59, and the support substrate 60 are formed as in the related art.
[0049]
In the second method, first, as shown in FIG. 3, a temporary passivation layer is formed thicker than the conventional passivation layer by a conventional method. The thickness of the passivation layer 56a is the same as the total thickness of the conventional passivation layer 56 shown in FIG. 5 and the transparent lower electrode layer 57 formed thereon. A photoresist mask 81 is formed in a pattern on the passivation layer 56a and etched by a photolithography method to form a pattern groove 82 for laminating a transparent lower electrode, as shown in FIG. Then, using the mask 81, an electrode material such as ITO or IZO is deposited by a sputtering method. When the groove 82 can be filled with the electrode material, the mask 82 and the electrode material deposited layer thereon are removed (lift-off). As a result, the transparent lower electrode 57 is formed, and the second passivation layer 70a is formed between the transparent lower electrodes 57. The second passivation layer 70a is a continuum with the lower passivation layer 56a, and is naturally made of the same material. After that, the organic light emitting layer 58, the upper electrode layer 59, and the support substrate 60 are formed as in the related art.
[0050]
In the above method, the second passivation layer 57 has been described as a single layer. However, the second passivation layer 57 may be composed of a lower layer made of an insulating organic compound and an upper layer made of an insulating inorganic compound. In this case, the insulating property is mainly maintained by the lower organic compound layer, and the passivation property can be secured by the lower inorganic compound. When this structure is employed, there is an advantage that it is possible to compensate for the tendency of the inorganic compound film to produce pinholes.
[0051]
As the insulating inorganic compound constituting the second passivation layer 70, titanium oxide or black diamond-like carbon is preferable, but other conventional insulating inorganic compounds can be used.
[0052]
Further, as the passivation layers 56 and 56a formed on the flattening layer, an insulating inorganic compound can be used. Examples of the insulating inorganic compound include silicon oxide, aluminum oxide, titanium oxide, silicon oxide, and nitrided oxide. Silicon and black diamond-like carbon can be used.
[0053]
When the second passivation layer 70 is composed of a lower layer made of an organic compound and an upper layer made of an inorganic compound, a common insulating polymer such as a polyimide resin can be used as the organic compound.
[0054]
The optical properties of the second passivation layer 70 are preferably such that they do not transmit light from the organic light-emitting layer. To this end, the second passivation layer 70 must have a refractive index of 1.8 or more. , And preferably black.
[0055]
Further, in the above-described embodiment, the description has been given of the device having the top emission structure in which the emission side of the display light is the substrate side on which the light emitting layer is provided, but the emission side is opposite to the substrate side on which the color conversion filter portion is formed. The present invention can be similarly applied to an element having a bottom emission structure.
[0056]
【The invention's effect】
As described above, the organic multicolor light-emitting display device according to the present invention has a structure in which at least a patterned color conversion filter layer is laminated on a transparent support substrate, and a flattening layer is formed thereon. A passivation layer is formed on the passivation layer, a patterned transparent lower electrode is formed on the passivation layer, and an organic light emitting layer is laminated so as to cover the transparent lower electrode. In an organic multicolor light emitting display device including an upper electrode and a sealing member, a second passivation layer is formed between the transparent lower electrodes.
[0057]
Further, a first configuration of the method for manufacturing an organic multicolor light emitting display element according to the present invention includes a step of stacking at least a color conversion filter layer on a transparent support substrate, patterning the layer, and forming a flattening layer thereon. Is formed, a passivation layer is formed on the planarization layer, a transparent lower electrode layer is laminated on the passivation layer, and the layer is patterned to form a transparent electrode. A second passivation layer, an organic light emitting layer stacked so as to cover the transparent electrode and the second passivation layer, and an upper electrode and a sealing member formed on the organic light emitting layer. And
[0058]
Further, a second configuration of the method for manufacturing an organic multicolor light emitting display element according to the present invention is such that at least a color conversion filter layer is laminated and patterned on a transparent support substrate, and a flattening layer is formed thereon. Is formed, a passivation layer is formed on the planarization layer, a patterned groove is formed in the passivation layer, and a transparent lower electrode layer is stacked so as to fill the groove, and the transparent lower electrode and the transparent lower electrode are formed. An organic light emitting layer is laminated so as to cover a passivation layer between the electrodes, and an upper electrode and a sealing member are formed on the organic light emitting layer.
[0059]
Therefore, according to the present invention, since a passivation layer having a passivation property equal to or higher than that of the transparent lower electrode is formed between the transparent lower electrodes, dark spots such as moisture from the color conversion filter layer are generated. In addition, the invasion of the growth-causing substance into the organic light-emitting layer can be greatly suppressed, and as a result, an organic multicolor light-emitting display element that maintains stable light-emitting characteristics for a long time can be realized and provided.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing an example of an organic multicolor light emitting display device of the present invention.
FIG. 2 is a schematic cross-sectional configuration diagram of an element showing a manufacturing process for describing an example of a method for manufacturing an organic multicolor light emitting display element of the present invention.
FIG. 3 is a schematic cross-sectional configuration diagram of an element showing a manufacturing process for describing another example of a method for manufacturing an organic multicolor light emitting display element of the present invention.
FIG. 4 is a schematic sectional configuration view of an element showing a step subsequent to that of FIG. 3;
FIG. 5 is a schematic cross-sectional configuration diagram of a conventional organic multicolor light emitting display element.
[Explanation of symbols]
51 Transparent support substrate
52 (R, G, B) color conversion filter layer
53 (R, G) color conversion layer
54 Black Mask
55 Flattening layer
56, 56a First passivation layer
57 transparent lower electrode
58 Organic EL layer
59 Upper electrode
60 Support substrate (sealing member)
70, 70a Second passivation layer
80,81 Photoresist mask
82 pattern groove

Claims (15)

On a transparent support substrate, at least a patterned color conversion filter layer is laminated, a flattening layer is formed thereon, a passivation layer is formed on the flattening layer, and a pattern is formed on the passivation layer. An organic multicolor light-emitting display element, comprising: a transparent lower electrode formed on the substrate; an organic light-emitting layer laminated to cover the transparent lower electrode; and an upper electrode and a sealing member formed on the organic light-emitting layer. At
An organic multicolor light emitting display device, wherein a second passivation layer is formed between the transparent lower electrodes. 2. The organic multicolor light emitting display device according to claim 1, wherein the second passivation layer is made of the same material as the first passivation layer. The organic multicolor light emitting display device according to claim 2, wherein the second passivation layer is a layer integrally continuous with a passivation layer formed on the planarization layer. The organic multicolor light emitting display device according to claim 1, wherein the second passivation layer is made of an insulating inorganic compound. The organic multicolor light emitting display device according to claim 4, wherein the insulating inorganic compound is titanium oxide or black diamond-like carbon. 2. The organic multicolor light emitting display device according to claim 1, wherein the second passivation layer comprises a lower layer made of an insulating organic compound and an upper layer made of an insulating inorganic compound. At least a color conversion filter layer is laminated and patterned on a transparent support substrate, a flattening layer is formed thereon, and a passivation layer is formed on the flattening layer. A patterned lower groove is formed, a transparent lower electrode layer is laminated to fill the groove, and an organic light emitting layer is laminated to cover the transparent lower electrode and a passivation layer between the electrodes. An organic multicolor light emitting display device, wherein an upper electrode and a sealing member are formed on a layer. On a transparent support substrate, at least a color conversion filter layer is laminated and the layer is patterned, a flattening layer is formed thereon, and a passivation layer is formed on the flattening layer. A transparent lower electrode layer, and patterning the layer to form a transparent lower electrode, and a second passivation layer between the transparent lower electrodes to cover the transparent electrode and the second passivation layer. A method of manufacturing an organic multicolor light emitting display device, comprising stacking an organic light emitting layer as described above and forming an upper electrode and a sealing member on the organic light emitting layer. 9. The method according to claim 8, wherein the second passivation layer is made of the same material as the first passivation layer. 9. The method according to claim 8, wherein the second passivation layer is made of an insulating inorganic compound. The method according to claim 10, wherein titanium oxide or black diamond-like carbon is used as the insulating inorganic compound. The method according to claim 8, wherein the second passivation layer comprises a lower layer made of an insulating organic compound and an upper layer made of an insulating inorganic compound. On a transparent support substrate, at least a color conversion filter layer is laminated and the layer is patterned, a flattening layer is formed thereon, a passivation layer is formed on the flattening layer, and a pattern is formed on the passivation layer. A transparent lower electrode layer is laminated so as to fill the groove, and an organic light emitting layer is laminated so as to cover the transparent lower electrode and a passivation layer between the electrodes. Forming an upper electrode and a support substrate on the substrate. 14. The method according to claim 13, wherein the passivation layer is made of an insulating inorganic compound. The organic multicolor light emitting display device according to claim 14, wherein the insulating inorganic compound is selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide, silicon oxide, silicon nitride, and black diamond-like carbon. Manufacturing method.

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