JP2006163325A - Organic el display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL multi-panel display which is easily applicable to a large-screen display, of which at least one side consists of three or more small-sized panels, and has joints made inconspicuous. <P>SOLUTION: The multi-panel organic EL display having a plurality of display panels joined to each other comprises the plurality of display panels, a support substrate for arranging and supporting the display panels, and at least one color conversion filter provided on the side opposite to the support substrate of the plurality of display panels. Each display panel comprises a panel substrate and an organic luminescent material provided on the panel substrate, and display panels adjacent to each other are electrically coupled via through holes formed in panel substrate edge parts of the display panels, and junction parts of the display panels are shielded from light by a light shielding part provided in the color conversion filter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an organic EL display, and more particularly to a multi-panel organic EL display. The multi-panel display can be used for a large screen television or the like.

  In an organic EL display manufacturing facility, the size of a panel that can be manufactured is limited by the size of the substrate that can be processed. For example, an organic EL material film forming apparatus can currently process a 400 mm square to 600 mm square substrate, and a 20-inch class display can be realized with a single substrate. However, 40-inch and 60-inch displays are configured by combining four or nine 20-inch substrates, for example.

  There is a proposal for forming a multi-panel type matrix display by connecting small organic EL display panels (for example, see Patent Documents 1 to 4).

  Patent Document 1 is an active matrix type multi-panel type display. In this display, an anode electrode made of metal is provided on a substrate on which TFTs are arranged in a matrix (TFT substrate), an organic EL layer is formed in a region surrounded by ribs on the anode electrode, A cathode electrode made of a transparent electrode is provided on the organic EL layer, and an auxiliary electrode is provided on the top of the rib in order to compensate for a decrease in luminance at the center of the screen due to the high resistance value of the transparent electrode. In order to prevent reflection of external light by the auxiliary electrode, a black matrix is provided in a portion that hits the rib (auxiliary electrode portion). In Patent Document 1, the end portions of each small panel are cut at the position of the ribs and joined together, and the boundary portion is covered with a black matrix, so that the boundary between the small panels is not conspicuous. .

  Patent Document 2 is a multi-panel type active matrix liquid crystal display device having a liquid crystal layer between an active matrix substrate and a counter substrate, and a color filter on the outside of the liquid crystal panel so as to cover a plurality of liquid crystal panels. The light shielding portion is provided in a predetermined pattern. As a result, the joint between the liquid crystal panels can be covered with the light shielding portion, and the joint can be made inconspicuous.

  In Patent Document 3, the transparent electrode formed on the main surface of the substrate of each small panel has an extension that extends to the side surface of the substrate, and each small panel is electrically conductive only in the thickness direction with the transparent electrode extension on the side. Are electrically connected through an anisotropic conductive sheet.

  In Patent Document 4, a small panel is bonded on a large substrate, a gap is provided between the small panels, an embedded portion is provided so as to fill the gap, and a sealing sealing member is attached around the embedded portion. A pedestal portion is provided.

  In Patent Document 5, a panel using a flexible substrate is used as a small panel, and the electrode driving circuit portion provided at the end of the panel is bent to the side opposite to the light extraction portion, so that the light emitting portion extends to the end of each small panel. Can be provided.

  Patent Document 6 has a front panel and a back panel provided at a predetermined interval, has a plurality of pixels and a plurality of electrodes between the front panel and the back panel, and a gap is provided on the back. A terminal connected to each of the plurality of electrodes is provided in the gap.

Japanese Patent Laid-Open No. 2002-372928 JP 2003-43954 A JP-A-5-205875 Japanese Patent Laid-Open No. 2001-102171 Japanese Patent Laid-Open No. 2002-297066 Japanese Patent Laid-Open No. 2001-251571

  However, the displays described in Patent Documents 1 and 2 are active matrix type displays, and TFTs have variations in elements, so that the driving method is complicated, and a large-area TFT substrate is difficult to produce and is expensive. Has drawbacks.

  The displays described in Patent Documents 3 and 4 are passive matrix displays, which have a simpler configuration and are easier to manufacture than the active matrix method. However, in the case of a passive matrix type row-column stripe electrode pattern, it is necessary to provide a space for the electrode extraction portion at the edge of each small panel, and therefore, a seam can be formed in the non-light-emitting area on the display side. It is easy for the viewer to recognize the display and is not practical as a display. It is not easy to narrow the space at the joint.

  As shown in FIG. 5, this type of display has the electrode take-out portions 52 and 53 placed on one side of the small panel 51 in rows and columns, and the multi-display has these electrode take-out portions arranged on the edge of the multi-panel. The method is adopted. However, as shown in FIG. 5, this system can only take a 2 × 2 configuration, and this system can be used for multi-panel displays with at least 3 sides, such as 3 × 3, 4 × 4, or 2 × 3. In addition, there is a demand for a configuration that can handle such a large multi-display.

  The proposals described in Patent Documents 5 and 6 attempt to cope with such training. However, in the method described in Patent Document 5, the electrode driving circuit portion is abruptly bent so as to be hidden behind the display, and is small. Since the panel is connected, there is a high risk of disconnection, which is not practical.

  In the display described in Patent Document 6, a gap provided on the back surface is provided in a narrow region between adjacent pixels, a plurality of terminals are arranged in the gap, and row electrodes or column electrodes are wired to the terminals in the gap, In addition, the work of forming the conductive pins has a drawback that it takes a lot of time in the case of a high-definition display with an increased number of pixels.

  In view of such a situation, the present inventors can easily apply to a large-screen display having a small panel having at least one side of 3 or more, which does not have the above-described problems, and has a conspicuous passive matrix system. As a result of studying the organic EL multi-panel display, the present invention has been achieved.

  That is, the organic EL display of the present invention is a multi-panel type organic EL display in which a plurality of display panels are bonded to each other, and includes a plurality of display panels, a support substrate for arranging and supporting the display panels, and the plurality of the plurality of display panels. The display panel comprises at least one color conversion filter provided on the surface opposite to the support substrate of the display panel, the display panel comprises a panel substrate and an organic light emitting material provided thereon, and the display panels adjacent to each other are The display panel is electrically joined through a through-hole formed in the edge of the panel substrate of each display panel, and the joined part of the display panel is shielded from light by a light shielding part provided in a color conversion filter.

  According to the present invention, a large-screen display composed of small panels having at least one side of 3 or more can be driven in a passive matrix manner so that the small panels are connected so that the joint is not noticeable. An EL display can be manufactured at low cost.

  FIG. 1 is a conceptual diagram showing an example of the organic EL display of the present invention, and shows an example of a 3 × 3 configuration. That is, the display panel (small panel) 11 is arranged on a support substrate (not shown) in a 3 × 3 configuration, and the drive units 12 and 13 are provided at the display edge.

  FIG. 6 is a conceptual diagram showing a state in which a plurality of display panels 68 are arranged between the support substrate 61 and the color conversion filter 69, and shows the case of two display panels. In FIG. 6, a plurality of display panels 68 made of organic EL elements are arranged on a support substrate 71 in which connection conductive portions (not shown) are arranged in advance, and a color conversion filter 69 having the same size as the support substrate 61 is arranged. An organic EL display having a desired size is formed by pasting on a plurality of display panels 68. Each of the display panels 68 includes a panel substrate 62 and an organic light emitter 63 provided thereon, and the color conversion filter 69 has a light shielding portion (black matrix) so as to leave an opening for the color filter on the transparent substrate 64 and the transparent substrate. ) 65 is formed, a color filter 66 is formed in the opening, a fluorescent conversion layer 67 is formed on the color filter 66 as necessary, and a flattening layer (not shown) is further formed. . In FIG. 6, the uppermost part of the color conversion filter 69 is arranged to be the transparent substrate 64. The light shielding portions 65 are arranged so as to cover the joints of the display panels 68 so as to eliminate the visual discomfort.

  As shown in FIG. 2, through holes 22 are formed at positions corresponding to the row electrode and column electrode patterns at the four edges of the panel substrate 21 of the display panel.

  The through hole 22 can be formed by laser beam irradiation, mechanical punching, or the like, but is not limited thereto.

  FIG. 3 is a diagram showing the connection conductive portion arranged on the support substrate 31 and shows an example of a 3 × 3 tile arrangement. The conductive portion 33 for connection is formed on the support substrate 31 having a desired area, and in accordance with the pattern of the row electrode and column electrode of the display panel, the two adjacent panel substrates adjacent to the joint portion of the display panel through the joint. It is provided at a position that connects the through holes. The connecting conductive portion 33 can be formed by a screen printing method at a predetermined position of the support substrate 31 using a conductive material such as a conductive paste.

  FIG. 4 is a diagram showing the connection of adjacent display panels. An electrode pattern 46 used as a bus electrode is formed on a panel substrate 41 in which a through hole 47 is formed. The bus electrode can be formed by sputtering, for example. When the bus electrode is formed, a thin film (not shown) made of the same electrode material as the bus electrode is formed around the inner wall of the through hole 47 and around the through hole 47 on the opposite side of the panel substrate 41 where the bus electrode is formed. It is formed and functions as a contact portion between the conduction path and the connection conductive portion 48 formed on the support substrate. The bus electrode of the adjacent display panel is connected to the electrode material thin film via the connection conductive portion 48. By providing the position of the through hole 47 outside the pixel at the edge of the display panel, the length of the joint can be made the same as the interval between adjacent pixels, and there is no visual discomfort.

  An anode 46 having a line pattern used as a row electrode or a column electrode is formed on the panel substrate 41.

  On the panel substrate 41 between the anode 46 and the anode, an interlayer insulating portion 43 is formed except for a portion serving as a pixel opening on the anode 46.

  The interlayer insulating portion 43 is formed wider than the cathode formation region outside the display region, and an opening is provided on the terminal pad portion of the cathode.

  The insulating film forming the interlayer insulating portion 43 needs to have a withstand voltage calculated from a voltage applied when the panel is driven, and has a thickness sufficient to obtain this withstand voltage.

  As the insulating film, a positive photoresist, a negative photoresist such as acrylate, an inorganic oxide film such as polyimide, SiOx, SiOxNy, SiNy, or TiOx can be used.

  On the interlayer insulating portion 43, a line pattern cathode separation wall (not shown) made of an insulating film having an overhang structure is formed in a direction perpendicular to the longitudinal direction of the anode line pattern. An organic light emitter 44 is formed between the cathode separation walls, and a line-patterned cathode 45 is formed on the organic light emitter 44 between the cathode separation walls. The anode 46 and the cathode 45 are formed through the organic light emitter 44 in directions orthogonal to each other, and the cathode 45 becomes a column electrode or a row electrode. When a current is passed through the row electrode and the column electrode, the pixel portion at the intersection of the row electrode and the column electrode emits light.

  The row electrode and the column electrode of the display panel are connected to the bus electrode at the edge of the display panel, and the bus electrode is in contact with the connecting conductive portion 48 through the electrode material thin film of the through hole portion. At the end, it is connected to the row electrode and the column electrode of the adjacent display panel via the electrode material thin film and the bus electrode of the through hole portion of the adjacent display panel. In this way, the row electrode or column electrode of the adjacent display panel is connected to the electrode material thin film via the connection conductive portion, and the row and column electrodes as a large screen display are continuously connected, and the drive portion is at the display end. Concatenated with

1. Color Conversion Filter In this specification, the color conversion filter is a generic name for a color filter layer, a color conversion layer, and a laminate of a color filter layer and a color conversion layer.

1.1 Color Filter Any color filter used in the present invention can be used as long as it is a color filter used in a flat panel display such as a liquid crystal display. In recent years, a pigment dispersion type color filter in which a pigment is dispersed in a photoresist has been widely used, and this can be preferably used in the present invention.

  The color filters for flat panel displays are a blue color filter that transmits light with a wavelength of 400 nm to 550 nm, a green color filter that transmits light with a wavelength of 500 nm to 600 nm, and a red color filter that transmits light with a wavelength of 600 nm or more. These are generally arranged, and a black matrix that does not transmit light in the visible range is generally disposed between the color filter pixels, mainly for the purpose of improving contrast. This can also be adopted in the present invention.

  The color conversion layer is a layer that absorbs light in the near-ultraviolet region or visible region, particularly blue or blue-green region emitted from the organic light emitter, and converts the wavelength distribution into visible light of different wavelengths. Preferably, at least one fluorescent dye in the red region is used, and may be combined with one or more fluorescent dyes that emit fluorescence in the green region. The color conversion layer can be formed using a material in which any fluorescent dye known in the art is dispersed in a matrix resin.

  Examples of fluorescent dyes that absorb light in the blue or blue-green region emitted from the organic light emitter and emit fluorescence in the red region include rhodamine B, rhodamine 6G, rhodamine 3B, rhodamine 101, rhodamine 110, sulforhodamine, basic violet. 11, rhodamine dyes such as basic red 2, cyanine dyes, and pyridine dyes such as 1-ethyl-2- [4- (p-dimethylaminophenyl) -13-butadienyl] -pyridium-perchlorate (pyridine 1) Or oxazine dyes.

  Examples of fluorescent dyes that absorb blue to blue-green light emitted from organic light emitters and emit green fluorescence include 3- (2′-benzothiazolyl) -7-diethylaminocoumarin (coumarin 6), 3- (2′-Benzimidazolyl) -7-N, N-diethylaminocoumarin (coumarin 7), 3- (2′-N-methylbenzimidazolyl) -7-N, N-diethylaminocoumarin (coumarin 30), 2, 3, 5 , 6-1H, 4H-tetrahydro-8-trifluoromethylquinolidine (9,9a, 1-gh) coumarin (coumarin 153) or the like, or basic yellow 51 which is a coumarin dye-based dye, Furthermore, naphthalimide dyes such as Solvent Yellow 11 and Solvent Yellow 116 are listed.

  The organic fluorescent dye used in the present invention is a polymethacrylate, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer resin, alkyd resin, aromatic sulfonamide resin, urea resin, melamine resin, benzoguanamine resin, and these resins. An organic fluorescent pigment may be obtained by kneading into a mixture or the like in advance to obtain a pigment.

  The organic fluorescent dye used in the present invention is contained in the color conversion layer in an amount of 0.01 to 5% by weight, more preferably 0.1 to 2% by weight, based on the weight of the color conversion layer. When the content of the organic fluorescent dye is less than 0.01% by weight, sufficient wavelength conversion cannot be performed. On the other hand, when the content exceeds 5% by weight, the color conversion efficiency decreases due to concentration quenching or the like. .

  The matrix resin used for the color conversion layer is a photocurable or photothermal combination type curable resin that is photo- and / or heat-treated to generate radical species and ionic species to polymerize or cross-link and insolubilize them. It is. The photocurable or photothermal combination type curable resin can be patterned with high definition, and is preferable in terms of reliability such as solvent resistance and heat resistance.

1.3 Flattening layer The flattening layer of the color filter is disposed for the purpose of protecting the color filter and smoothing the film surface, and has excellent light transmittance and deteriorates the color filter. Materials and processes that can be disposed of are selected. Further, when a transparent conductive film or the like is formed on the upper surface of the color filter, sputtering resistance is also required.

  Since the planarization layer has the purpose of smoothing as described above, it is generally formed by a coating method. As a material applicable to the flattening layer, a photocurable or photothermal combination type curable resin is subjected to light and / or heat treatment to generate radical species and ionic species to be polymerized or crosslinked to be insoluble and infusible. Things are common. In addition, since the photo-curable or photothermal combined type curable resin performs patterning of the color conversion layer, it is desirable that the photo-curable or photo-thermal curable resin is soluble in an organic solvent or an alkali solution before curing.

  Specifically, the photocurable or photothermal combination type curable resin is (1) a composition comprising an acrylic polyfunctional monomer and oligomer having a plurality of acryloyl groups and methacryloyl groups, and a photo or thermal polymerization initiator, (2 ) A composition comprising a polyvinyl cinnamate ester and a sensitizer, (3) a composition comprising a chain or cyclic olefin and bisazide, and (4) a composition comprising a monomer having an epoxy group and a photoacid generator. A film made of these compositions is formed by coating, and light or heat treatment is performed to generate a photoradical or a heat radical in the case of (1), and in the case of (2), to be crosslinked by dimerization. In the case of (4), nitrene is generated to crosslink the olefin, and in the case of (4), an acid (cation) is generated to effect insolubilization by polymerization. Among these, (1) is particularly preferable because high-definition patterning is possible and solvent resistance and heat resistance are excellent.

  In addition, polycarbonate (PC), polyethylene terephthalate (PET), polyether sulfone, polyvinyl butyral, polyphenylene ether, polyamide, polyether imide, norbornene resin, methacrylic resin, isobutylene maleic anhydride copolymer resin depending on the purpose and conditions of use , Thermoplastic resins such as cyclic olefins, thermosetting resins such as epoxy resins, phenol resins, urethane resins, urea resins, melamine resins, or trifunctional or tetrafunctional alkoxy with polystyrene, polyacrylonitrile, polycarbonate, etc. A polymer hybrid containing silane can also be used.

2. Display Panel 2.1 Panel Substrate The display panel is composed of a panel substrate and an organic light emitter provided thereon. As the panel substrate, a transparent plastic film having a film thickness of about 50 to 500 μm is usually used. PC (polycarbonate), PET (polyethylene terephthalate), PES (polyether sulfone), PEN (polyethylene naphthalate), polyimide, PO (Polyolefin) or the like can be used, and a film made of a relatively heat-resistant plastic such as PC, PET, PES, PEN, or polyimide is preferably used. The panel substrate is not limited to the above materials, and a film based on a multilayer resin film can also be used.

2.2 Organic light-emitting body The organic light-emitting body holds at least the organic EL light-emitting layer between a pair of electrodes, and if necessary, a hole injection layer, a hole transport layer, an electron transport layer and / or an electron injection layer It has a structure with intervening. Specifically, those having the following layer structure are employed.
(1) Anode / organic EL light emitting layer / cathode (2) Anode / hole injection layer / organic EL light emitting layer / cathode (3) Anode / organic EL light emitting layer / electron injection layer / cathode (4) Anode / hole injection Layer / organic EL light emitting layer / electron injection layer / cathode (5) anode / hole injection layer / hole transport layer / organic EL light emitting layer / electron injection layer / cathode

  In the above layer structure, at least one of the anode and the cathode is preferably transparent in the wavelength range of light emitted from the organic light emitter, and emits light through the transparent electrode, so that the fluorescent color conversion film of the color conversion filter Make light incident on. In this technique, it is known that it is easy to make the anode transparent, and it is preferable to make the anode transparent also in the present invention.

  Known materials are used as the material for each of the above layers. For example, in order to obtain blue light emission as an organic light emitting layer, for example, fluorescent brighteners such as benzothiazole, benzimidazole, and benzoxazole, metal chelated oxonium compounds, styrylbenzene compounds, aromatic dimethylidin compounds Etc. are preferably used.

  Examples of the electron injection layer include alkali metals such as lithium, sodium, and potassium, alkaline earth metals such as calcium, magnesium, and strontium, or electron injecting metals made of fluorides thereof, and alloys with other metals. Or a material such as a compound can be used. As the electron transport layer, a metal complex such as an aluminum quinoline complex, oxadiazole, a triazole compound, or the like can be used. For the hole injection layer, aromatic amine compounds, starburst amines, benzidine amine multimers, copper phthalocyanine (CuPc), and the like can be used. As the hole transport layer, a starburst amine, an aromatic diamine, or the like can be used.

  Examples of the anode and cathode patterns include parallel stripes formed so as to intersect each other. In this case, the organic light emitting device of the present invention can perform matrix driving. That is, when a voltage is applied to the specific stripe of the anode and the specific stripe of the cathode, the portion where the stripes intersect in the organic light emitting layer emits light. Accordingly, by applying a voltage to selected stripes of the anode and the cathode, it is possible to emit light only at a portion where a specific color conversion film and / or filter is located.

3. Support Substrate In the present invention, any support substrate can be used as long as it is a transparent substrate used in an organic EL display panel, and is not particularly limited. Examples of the material for the transparent substrate include glass, ceramics, polyethylene terephthalate, polysulfone, and polycarbonate. The connection conductive portion provided on the support substrate can be formed by screen printing of a conductive paste. A conductive paste using Ag as a filler is preferable.

  The organic EL display of the present invention will be further described below using examples.

<Example 1>
A 40-inch SVGA standard (800 × RBG × 600) display was produced. The pixel pitch is 1.016 mm. The RGB subpixel size was 0.148 mm × 0.704 mm, the subpixel interval was 0.130 mm, the pixel size was 0.704 mm × 0.704 mm, and the pixel interval was 0.312 mm.

(Production of display panel)
A polyimide film of 500 mm × 500 mm × 0.5 mm was used as a panel substrate of the display panel, and a 20-inch display portion (400 × RGB × 300) having the above pixel configuration was produced on this panel substrate.

  First, Mo having a resistivity of 1.5 × 10 −5 Ω · cm was formed to a thickness of 300 nm and a width of 10 μm as a cathode terminal pad portion and an anode auxiliary electrode portion. A DC magnetron sputtering method was used to form the Mo film. After applying a resist agent “OFRP-800” (trade name, manufactured by Tokyo Ohka Kogyo Co., Ltd.) on the Mo film, patterning was performed by a photolithography method. Thereafter, a KrF excimer laser, a laser spot diameter of 50 μm, a laser output of 100 mJ / pulse to 450 mJ / pulse, and a through hole penetrating the Mo film and the polyimide film were formed at a position 70 μm inside from the display portion edge. The through-holes were provided at positions corresponding to the anode stripe pattern and cathode stripe pattern to be formed later.

  Next, a transparent electrode (ITO) was formed on the entire surface of the panel substrate as an anode by sputtering. After applying a resist agent “OFRP-800” (trade name, manufactured by Tokyo Ohka Kogyo Co., Ltd.) on ITO, patterning is performed by a photolithography method. An anode having a 100 nm stripe pattern was obtained.

  Next, a positive photoresist “WIX-2A” (trade name, manufactured by Nippon Zeon Co., Ltd.) was used to form an insulating film having a thickness of 1 μm, leaving an opening corresponding to the subpixel. The angle between the end of the insulating film and the end of the opening is an acute angle. (The width of the bottom of the opening is wider than the width of the opening at the top of the insulating film.) This insulating film showed a sufficient withstand voltage against the voltage applied when the panel was driven.

  Next, a negative photoresist “ZPN1100” (trade name, manufactured by Nippon Zeon Co., Ltd.) was used to form an adjacent pixel and a partition wall having a thickness of 4 μm in the middle of the pixel perpendicular to the strike pattern of the ITO electrode. The width of the partition wall is not more than the pixel gap interval, preferably not more than 50 μm narrower than the pixel gap interval, and may be 100 μm or more. In this example, the cross-sectional shape of the partition wall is an inversely tapered shape, the top width is 230 μm, the bottom width is 130 μm, and the pitch is 1.016 μm. The ends of the barrier ribs were connected by barrier ribs extending perpendicular to the cathode extension direction.

Next, the substrate on which the anode was formed was mounted in a resistance heating vapor deposition apparatus, and a hole injection layer, a hole transport layer, an organic light emitting layer, and an electron injection layer were sequentially formed without breaking the vacuum. During film formation, the internal pressure of the vacuum chamber was reduced to 1 × 10 ⁻⁴ Pa. As the hole injection layer, copper phthalocyanine (CuPc) was laminated to a thickness of 100 nm. As the hole transport layer, 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (α-NPD) was laminated to 20 nm. The organic light emitting layer was laminated | stacked 30 nm. The host material of the organic light emitting layer is 4,4'-bis [2,2'-diphenylvinyl) biphenyl (DPVBi), and the guest is 4,4'-bis [2- {4- (N, N-diphenylamino) phenyl } Vinyl] biphenyl (DPAVBi). The electron injection layer was formed by laminating 20 nm of aluminum chelate (Alq3).

  Thereafter, using a metal mask, a cathode composed of a Mg / Ag (10: 1 weight ratio) layer having a thickness of 200 nm was formed between the barrier ribs without breaking the vacuum.

  Finally, the display panel was cut out from the substrate into a 20-inch size (304.8 mm × 406.4 mm) to obtain a display panel for combination.

(Production of support substrate)
A conductive paste using Ag is applied on a glass plate (645 mm × 845 mm × 1.1 mm) serving as a support substrate of the display by a screen printing method and baked (150 ° C., 30 minutes). A pattern was formed. The pattern of the conductive part for connection was set to have a width of 0.140 mm, a length of 0.500 mm, and a thickness of 500 nm on the extension line of the anode stripe or the cathode stripe at the joint position of the display substrate.

(Attaching the display panel to the support substrate)
A 20-inch size display panel was aligned and pasted 2 × 2 on the support substrate on which the conductive portion for connection prepared above was formed, to form a 40-inch organic EL light-emitting portion.

(Create color conversion filter)
[Preparation of black matrix]
On a Corning glass (645 mm x 845 mm x 1.1 mm) as a transparent substrate, a resist resin containing a black pigment is applied by spin coating, patterning is performed by photolithography, and openings for forming color filters are formed. A black matrix having a thickness of 2 μm was formed.

[Preparation of blue filter pattern]
After applying blue filter material (Fuji Hunt Electronics Technology, color mosaic CB-7001) by spin coating method, patterning is performed by photolithography method, blue filter line width 0.148mm, pitch 1.016mm, film thickness A 6 μm line pattern was obtained.

[Production of green conversion filter pattern]
Coumarin 6 (0.7 parts by weight) as a fluorescent dye is dissolved in 120 parts by weight of propylene glycol monoethyl acetate (PGMEA) as a solvent, and a photopolymerizable resin [V259PA / P5] (trade name, Nippon Steel Chemical Industries Ltd.) 100 parts by weight (manufactured by company) was added and dissolved to obtain a coating solution. This coating solution is applied onto a Corning glass as a transparent substrate on which a blue filter pattern has been previously formed by using a spin coating method, patterned by a photolithographic method, and a green conversion filter having a line width of 0.148 mm. A line pattern having a pitch of 1.016 mm and a film thickness of 10 μm was obtained.

[Create red conversion filter pattern]
Coumarin 6 (0.6 parts by mass), rhodamine 6G (0.3 parts by mass) and basic violet 11 (0.3 parts by mass) were dissolved in 120 parts by mass of propylene glycol monoethyl acetate (PGMEA) as a solvent. . 100 parts by mass of a photopolymerizable resin “V259PA / P5” (trade name, manufactured by Nippon Steel Chemical Co., Ltd.) was added to the obtained solution and dissolved to obtain a coating solution. This coating solution is applied onto a Corning glass on which a blue filter and green conversion filter pattern has been previously formed, using a spin coating method, and then patterned by a photolithographic method. The line width of the red conversion filter is 0.148 mm. A line pattern having a pitch of 1.016 mm and a film thickness of 10 μm was obtained.

[Fabrication of planarization layer]
On this color conversion layer, a UV curable resin (epoxy modified acrylate; manufactured by JSR, NN810) is applied as a flattening layer and a gas barrier layer by a spin coat method, and irradiated with a high-pressure mercury lamp to apply the UV curing. The mold resin was cured. The thickness of the obtained flattening layer was 5 μm, there was no deformation of the conversion layer pattern, and the upper surface of the flattening layer was flat.

(Lamination)
The color conversion filter thus obtained and the display panel attached to the support substrate are bonded together in a glove box in a dry nitrogen atmosphere (both oxygen and moisture concentrations are 10 ppm or less) and sealed with a UV curable sealing resin. Stopped.

The obtained 40-inch display emits light with a luminance of 100 to 300 cd / m ² by applying a driving voltage of 15 to 30V.

<Example 2>
Using a 20-inch display panel similar to that produced in Example 1, an 80-inch display having a 4 × 4 configuration was produced in the same procedure as in Example 1. This corresponds to the UXGA plan (1600 × RGB × 1200).

The obtained 80-inch display emits light with a luminance of 100 to 300 cd / m ² by applying a drive voltage of 20 to 40V.

<Example 3>
The pixel pitch is 1.19 mm. The same procedure as in Example 1 except that the RGB subpixel size is 0.206 mm × 0.878 mm, the subpixel interval is 0.312 mm, the pixel size is 0.878 mm × 0.878 mm, and the pixel interval is 0.312 mm. A 20-inch display panel was produced, and an XGA standard (1024 × RGB × 768) display was produced with a 3 × 3 configuration. The obtained 60-inch display emits light with a luminance of 100 to 300 cd / m ² by applying a drive voltage of 20 to 40V.

  The organic EL display of the present invention can be easily connected to a plurality of display panels to form a large screen display, and the joints can be made inconspicuous. Therefore, the organic EL display is useful for a large screen television.

It is a conceptual diagram which shows the example of 3x3 structure of the organic electroluminescent display of this invention. It is a figure which shows the through-hole provided in the panel board | substrate of a display panel. It is a figure which shows the electroconductive part for a connection arrange | positioned on the support substrate of 3x3 tile arrangement | positioning. It is a figure which shows the connection of an adjacent display panel. It is a conceptual diagram which shows the example of the display of a 2x2 structure of a conventional system. It is a conceptual diagram which shows the state in which the some display panel was arranged between the support substrate and the color conversion filter.

Explanation of symbols

11, 51, 68: Display panel 12, 52: Drive unit 1
13, 53: Drive unit 2
21, 41, 62: Panel substrate 22, 47: Through hole 31, 61: Support substrate 32: Display range 33, 48: Conductive connection portion 42: Anode 43: Interlayer insulating portion 44: Organic light emitter 45: Cathode 46: Bus electrode 63: Organic light emitter 64: Transparent substrate 65: Light shielding part 66: Color filter 67: Fluorescence conversion layer 69: Color conversion filter

Claims (4)

  A multi-panel type organic EL display in which a plurality of display panels are joined together, a plurality of display panels, a support substrate for arranging and supporting the display panels, and a surface opposite to the support substrate of the plurality of display panels The display panel is composed of a panel substrate and an organic light emitter disposed on the panel substrate. Adjacent display panels are formed on the edge of the panel substrate of each display panel. An organic EL display characterized in that the display panel is electrically joined through the through-hole, and the joined portion of the display panel is shielded from light by a light shielding portion provided in the color conversion filter.   2. The organic EL display according to claim 1, wherein the panel substrate is a film-like plastic substrate.   The light emitter has a patterned anode facing the panel substrate, and electrical connection through the through holes formed in the edge of the panel substrate of the display panels adjacent to each other includes an inner wall of the through hole and 3. The organic EL display according to claim 1, wherein the conductive thin film connected to the anode provided around the hole on the back surface of the panel substrate is brought into contact with a connecting conductive portion provided on the support substrate.   4. The organic EL display according to claim 3, wherein the connecting conductive portion is formed by a screen printing method.

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