US20040169467A1 - Luminescent display device and method of manufacturing same - Google Patents
Luminescent display device and method of manufacturing same Download PDFInfo
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- US20040169467A1 US20040169467A1 US10/747,088 US74708803A US2004169467A1 US 20040169467 A1 US20040169467 A1 US 20040169467A1 US 74708803 A US74708803 A US 74708803A US 2004169467 A1 US2004169467 A1 US 2004169467A1
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- metal oxide
- auxiliary electrode
- transparent electrode
- resin substrate
- display device
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- 238000010030 laminating Methods 0.000 claims description 8
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- 239000004020 conductor Substances 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
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- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 claims description 3
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- 238000007254 oxidation reaction Methods 0.000 description 2
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 description 2
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- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- CQTFXFSDRFCIRT-UHFFFAOYSA-N copper palladium silver Chemical compound [Pd][Cu][Ag] CQTFXFSDRFCIRT-UHFFFAOYSA-N 0.000 description 1
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- NJWNEWQMQCGRDO-UHFFFAOYSA-N indium zinc Chemical compound [Zn].[In] NJWNEWQMQCGRDO-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/805—Electrodes
- H10K59/8051—Anodes
- H10K59/80516—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
Definitions
- the present invention relates to a luminescent display device including a substrate, particularly formed of resin substrate, and a transparent electrode, an auxiliary electrode and a luminescent layer which are laminated on the substrate and also relates to a method of manufacturing such luminescent display device.
- organic EL electro-luminescent or electroluminescent
- FIG. 5 represents steps for preparing an organic EL element on a glass substrate. That is, a glass substrate 1 is prepared (step S 1 ). A transparent electrode 2 as anode is formed on the substrate 1 in form of a film (step S 2 ), and in this step S 2 , the transparent electrode 2 is formed at a high temperature of more than 200° C. for the purpose of reducing resistance. This transparent electrode 2 is subjected to a patterning treatment or process by using a photoresist or acid so as to provide a stripe shape.
- a metal film 3 constituting an auxiliary electrode is formed on the transparent electrode 2 (step S 4 ).
- This metal film 3 as auxiliary electrode is then subjected to the patterning treatment, as in the former step S 3 , by using a photoresist or acid (step S 5 ).
- the acid is used for a metal etching treatment, it is important for the acid not to erode the transparent electrode 2 .
- a chlorine-base acid is used for the patterning treatment of the transparent electrode 2 and a mixture acid of phosphoric acid and nitric acid.
- Such mixture acid is utilized for the etching treatment of Al and Ag alloys, but has a property not eroding the transparent electrode formed at a high temperature, and hence, has been utilized from old days.
- a luminescent layer is laminated, and thereafter, a metal electrode as cathode is formed on the luminescent layer in shape of stripe extending in a direction normal to the transparent electrode 2 .
- a resin substrate may be utilized in place of the glass substrate, and in such case, the substrate can be made thin and, in addition, can hardly be cracked. Furthermore, the organic EL display device utilizing the resin substrate has flexibility so as to be bendable, thus being advantageous.
- the transparent electrode and the metal auxiliary electrode are laminated on the substrate, it is obliged for the transparent electrode to be formed at a low temperature less than 100° C. because of heat resistant property of the resin substrate.
- the transparent electrode thus formed at the low temperature has a nature, different from that formed at a high temperature of more than 200° C., that is easily eroded by acid. This nature will be also applied to the case of using the mixture acid of phosphoric acid and nitric acid, and the surface of the transparent electrode is corroded and made coarse by such acid at the time of the patterning. On such surface, leak or dark spot is likely generated, which results in inadequate display.
- An object of the present invention is to substantially eliminate defects or drawbacks encountered in the prior art described above and to provide a luminescent display device capable of keeping smoothness of a surface of a transparent electrode and obtaining a good displaying result in a case of laminating a transparent electrode and an auxiliary electrode on a resin substrate and also provide a method of manufacturing such luminescent display device.
- the inventors of the subject application developed a technology of preparing the organic EL display element on the resin substrate by providing a new layer structure of resin substrate/auxiliary electrode/transparent electrode which is different from the conventional layer structure of glass substrate/transparent electrode/auxiliary electrode.
- a luminescent display device comprising:
- an auxiliary electrode made of metal and disposed on the one surface of the resin substrate
- a transparent electrode disposed on the auxiliary electrode, the auxiliary electrode being conductive to the transparent electrode;
- a luminescent layer composed of an organic compound and disposed on the transparent electrode.
- the transparent electrode is formed after the formation and patterning of the metal auxiliary electrode, so that the transparent electrode never be eroded by an etching solution at the time of the patterning to the auxiliary electrode. Therefore, the surface of the transparent electrode can be kept smooth, and moreover, since the metal auxiliary electrode is covered by the transparent electrode, the oxidization of the metal auxiliary electrode can be prevented.
- a layer of metal oxide is further formed between the resin substrate and the auxiliary electrode.
- the metal oxide is formed of a conductive material, which is formed in form of film and is then subjected to a patterning treatment or process.
- the metal oxide is formed of an oxide including at least one of tin (Sn), zinc (Zn) and indium (In).
- the metal oxide is formed of an insulating material, which is formed in form of film.
- the metal oxide is formed of an oxide including at least one of aluminium (Al), zirconium (Zr), titanium (Ti), calcium (Ca), magnesium (Mg), chromium (Cr), nickel (Ni) and silica (Si).
- a moisture-proof layer may be further formed between the resin substrate and the metal oxide for shutting out moisture or water content.
- the location of the metal oxide layer between the resin substrate and the metal auxiliary electrode can improve the adhesive performance of the auxiliary electrode.
- the metal oxide is formed of a conductive material
- the patterned respective auxiliary electrodes become conductive through the formation of the metal oxide layer below the auxiliary electrode.
- the metal oxide layer is patterned in the same form as that of the auxiliary electrode, the above defect can be solved.
- the metal oxide is formed of an insulating material, the patterned auxiliary electrode does not become conductive even if the metal oxide is disposed below the auxiliary electrode. Thus, the patterning process can be eliminated.
- the formation of the moisture-proof layer can shut out the invasion of the moisture or water content to the luminescent layer, thus maintaining the good light emission performance.
- a metal oxide may be further formed on the one surface of the resin substrate before the lamination of the auxiliary electrode.
- the metal oxide is formed of a conductive material, which is formed in form of film, and is then subjected to a patterning treatment.
- the metal oxide may be formed of an insulating material, which is formed in form of film.
- the metal oxide and the auxiliary electrode are patterned at the same time by utilizing a photolithography technology or using an acid.
- the transparent electrode is formed in form of film through spattering, ion-plating or epitaxial growth treatment or process and then patterned by utilizing a photolithography technology or using an acid.
- FIG. 1 is an illustrated sectional view of a luminescent display device according to one embodiment of the present invention
- FIG. 2 includes views representing a manufacturing steps of the luminescent display device of FIG. 1;
- FIG. 3 includes views representing a manufacturing steps of a luminescent display device prepared for a comparison (Comparative Example 1) with the embodiment of the present invention of FIG. 1;
- FIG. 4 includes views representing a manufacturing steps of a luminescent display device prepared for another comparison (Comparative Example 2) with the embodiment of the present invention of FIG. 1;
- FIG. 5 includes views representing a manufacturing steps of a luminescent display device having a conventional structure.
- the luminescent display device 11 includes a resin substrate 11 on which an organic electro-luminescent (EL) element having a laminated structure is disposed.
- the laminated structure of the organic EL element comprises a layer composed of a metal oxide 12 , an auxiliary electrode 13 of conductive metal material, a transparent electrode 14 and a luminescent layer 15 composed of an organic compound, these materials and electrodes being laminated in the described order on the resin substrate 11 .
- the subject feature resides in its laminated layer structure of metal oxide 12 /metal auxiliary electrode 13 /transparent electrode 14 disposed on the resin substrate 11 .
- the resin substrate 11 has a transparent or translucent (semi-transparent) property with respect to a visible light and has, for example, a thickness of 0.2 mm.
- the resin substrate 11 has at least one surface formed with moisture-proof layer 19 shutting out moisture or water content.
- Such resin substrate 11 may preferably be formed from a liquid crystal substrate having a base material of PC (polycarbonate).
- PC polycarbonate
- the material and thickness of the resin substrate 11 are not limited to the above ones in the present invention.
- the metal oxide layer 12 is formed on the resin substrate 11 .
- This metal oxide layer 12 is formed for the purpose of enhancing or improving adhesion performance between the resin substrate 11 and the metal auxiliary electrode 13 .
- the metal oxide 12 an indium-tin oxide is used, and the thin layer of the metal oxide 12 is formed by or through a vacuum evaporation, spattering, ion-plating or epitaxial growth treatment or process.
- This thin layer in form of film is subjected to a patterning treatment so as to provide the same plane shape as that of the auxiliary electrode 13 in the patterning treatment of the auxiliary electrode 13 which is carried out thereafter.
- the metal oxide 12 is formed from a conductive material
- the patterned auxiliary electrodes 13 are made conductive when the metal oxide layers 12 are formed below the layers of the auxiliary electrodes 13 , respectively.
- the metal oxides 12 are patterned together with the auxiliary electrodes 13 .
- the indium-tin oxide is utilized as the metal oxide 12
- another one may be utilized as far as it can ensure good adhesion property between the metal oxide of thin film and the transparent or translucent metal auxiliary electrode 12 .
- an oxide, as metal oxide 12 including at least either one of tin (Sn), zinc (Zn) and indium (In).
- the metal oxide is formed of an insulating material, it is not necessary to carry out the patterning treatment as in the present embodiment.
- metal oxide 12 formed of insulating material an oxide including at last one of aluminium (Al), zirconium (Zr), titanium (Ti), calcium (Ca), magnesium (Mg), chromium (Cr), nickel (Ni), silica (Si) and the like.
- the metal auxiliary electrode 13 is laminated on the metal oxide layer 12 so as to be electrically conductive to the transparent electrode 14 for the purpose of realizing a reduced resistance of the transparent electrode 14 .
- the auxiliary electrode 13 is formed by forming a thin metal film through a vacuum evaporation, spattering, ion-plating or epitaxial growth treatment or process, and thereafter, the thus formed thin metal film is patterned by utilizing a photolithography technology or using acid or like. At the time of the patterning treatment to the metal thin film, the metal oxide 12 disposed below the auxiliary electrode 13 is also subjected to the patterning treatment together with the auxiliary electrode 13 .
- Such auxiliary electrode 13 may be formed from an alloy of silver (Ag), chromium (Cr), molybdenum (Mo), copper (Cu), aluminium (Al) or like.
- the transparent electrode 14 has transparent or translucent property with respect to visual light, and for example, is formed of a conductive material such as an oxide of indium-tin, an oxide of indium-zinc, or like.
- a conductive material such as an oxide of indium-tin, an oxide of indium-zinc, or like.
- Such transparent electrode 14 is formed by first forming a thin film of oxide through vacuum evaporation, spattering, ion-plating or epitaxial growth treatment or process, and thereafter, by patterning the thus formed thin film.
- the transparent electrode 14 is formed so as to provide a stripe plane shape.
- the luminescent layer 15 is further formed on the transparent electrode 14 by evaporating and spattering an organic compound.
- the luminescent layer 15 formed of the organic compound may have a single layer structure having only one organic layer or have a multi (plural) layer structure in which a plurality of functions such as luminous function, carrier conveying function or like function are endowed separately to the respective layers.
- a metal electrode 16 as cathode which is formed into a film shape and then patterned.
- the metal electrode 16 is formed as a thin metal film so as to provide a stripe shape normal to the transparent electrode 14 .
- the EL element is composed of the metal oxide 12 , the auxiliary electrode 13 , the transparent electrode 14 , the luminescent layer 15 and the metal electrode 16 , which are disposed in this order on one surface (upper surface as viewed in FIG. 1) of the resin substrate 11 , and are covered by a seal layer 17 .
- the seal layer 17 is formed of a silicon nitride, epoxy resin or like material and disposed for the purpose of shutting out the invasion of moisture or water content in the atmospheric air into the luminescent layer 15 .
- FIG. 2 includes several views representing the manufacturing steps of the luminescent display device of FIG. 1 of the present invention.
- the transparent resin substrate 11 is prepared (step S 1 ).
- step S 2 a moisture-proof layer 19 is formed in form of film on at least one surface of the resin substrate 11 through the evaporation, spattering, ion-plating, epitaxial growth treatment or process, or like process.
- the metal oxide layer 12 is formed, in form of film, on the moisture-proof layer 19 through the spattering, ion-plating or epitaxial growth treatment or process (step S 3 ).
- the auxiliary electrode 13 is then formed in form of film on the layer of the metal oxide 12 through the evaporation, spattering, ion-plating or epitaxial growth treatment or process.
- the auxiliary electrode 13 and the metal oxide 12 are subjected together to the patterning treatment by utilizing photolithography technology or using an acid (step S 5 ).
- the transparent electrode 14 is further formed in form of film on the same surface side of the resin substrate 11 through, as that mentioned above, the spattering process, ion-plating process or epitaxial growth process (step S 6 ). This transparent electrode 14 is then patterned by utilizing the photolithography technology or using an acid (step S 7 ).
- the luminescent layer 15 is formed in form of film by carrying out the evaporation, spattering, spin-coat, screen printing or fine-grain spraying treatment or process to an organic compound. Thereafter, the metal electrode 16 is formed on the luminescent layer 15 by utilizing the evaporation process, spattering process or photolithography technology, or using an acid.
- the transparent electrode 14 is formed in form of film after the forming and patterning treatments of the metal auxiliary electrode 13 , so that there is no fear of erosion of the transparent electrode 14 by the etching solution at the time of patterning of the auxiliary electrode 13 .
- the surface of the transparent electrode 14 can be kept smooth and fine luminescent condition can be maintained.
- the metal auxiliary electrode 13 is covered by the transparent electrode 14 , the oxidation of the metal auxiliary electrode 13 can be prevented.
- the metal oxide layer 12 is interposed between the resin substrate 11 and the auxiliary electrode 13 , the adhesion property of the auxiliary electrode 13 to the resin substrate 11 can be improved.
- the moisture-proof layer 19 was first formed in form of film for shutting out moisture or water content from the surface of the resin substrate 11 . Thereafter, indium-tin oxide was spattered in form of film as metal oxide 12 on the moisture-proof layer 19 , and silver-palladium copper alloy was spattered so as to form the metal auxiliary electrode 13 in form of film (steps S 3 and S 4 in FIG. 2). Then, the metal oxide 12 and the auxiliary electrode 13 were patterned so as to provide substantially the same shape, and thereafter, indium-tin oxide was spattered so as to provide the transparent electrode 14 in form of film (steps S 5 and S 6 in FIG. 2). The transparent electrode 14 was then patterned so as to form an electrode for the organic EL element (step S 7 in FIG. 2).
- steps S 1 to S 6 for manufacturing a comparative example 2 .
- An organic EL element was formed on the resin substrate 11 in accordance with these steps.
- steps S 1 to S 2 the resin substrate 11 was prepared and the moisture-proof layer 19 , in form of film, for shutting out the moisture or water content was formed on the resin substrate 11 .
- copper-palladium silver alloy was spattered so as to form the metal auxiliary electrode 13 , in form of film, and then patterned (steps S 3 and S 4 in FIG. 4).
- indium-tin oxide was spattered so as to provide the transparent electrode 14 in form of film and then patterned so as to provide an electrode for an organic EL element (steps S 5 and S 6 in FIG. 4).
- steps S 5 and S 6 in FIG. 4 there caused a problem that the metal auxiliary electrode 13 was peeled from the resin substrate 11 .
Abstract
A luminescent display device comprises a resin substrate having one and another surfaces, an auxiliary electrode made of metal and disposed on the one surface of the resin substrate, a transparent electrode disposed on the auxiliary electrode in a conductive state to the auxiliary electrode, and a luminescent layer composed of an organic compound and disposed on the transparent electrode. A layer of metal oxide may be further formed between the resin substrate and the auxiliary electrode.
Description
- The present invention relates to a luminescent display device including a substrate, particularly formed of resin substrate, and a transparent electrode, an auxiliary electrode and a luminescent layer which are laminated on the substrate and also relates to a method of manufacturing such luminescent display device.
- Generally, there is known an organic EL (electro-luminescent or electroluminescent) display element, and such organic EL display element has been manufactured on a transparent glass substrate as a luminescent display device.
- FIG. 5 represents steps for preparing an organic EL element on a glass substrate. That is, a
glass substrate 1 is prepared (step S1). Atransparent electrode 2 as anode is formed on thesubstrate 1 in form of a film (step S2), and in this step S2, thetransparent electrode 2 is formed at a high temperature of more than 200° C. for the purpose of reducing resistance. Thistransparent electrode 2 is subjected to a patterning treatment or process by using a photoresist or acid so as to provide a stripe shape. - Next, a
metal film 3 constituting an auxiliary electrode is formed on the transparent electrode 2 (step S4). Thismetal film 3 as auxiliary electrode is then subjected to the patterning treatment, as in the former step S3, by using a photoresist or acid (step S5). In this step S5, although the acid is used for a metal etching treatment, it is important for the acid not to erode thetransparent electrode 2. In general, a chlorine-base acid is used for the patterning treatment of thetransparent electrode 2 and a mixture acid of phosphoric acid and nitric acid. Such mixture acid is utilized for the etching treatment of Al and Ag alloys, but has a property not eroding the transparent electrode formed at a high temperature, and hence, has been utilized from old days. After the steps mentioned above, a luminescent layer is laminated, and thereafter, a metal electrode as cathode is formed on the luminescent layer in shape of stripe extending in a direction normal to thetransparent electrode 2. - When a direct current (DC) field is applied between the transparent electrode (anode side) and the metal electrode (cathode side), an electric current passes an organic compound and the luminescent layer is hence emitted. The light emitted from the luminescent layer is taken out on the transparent electrode side.
- In order to make thin an organic EL display device, a resin substrate may be utilized in place of the glass substrate, and in such case, the substrate can be made thin and, in addition, can hardly be cracked. Furthermore, the organic EL display device utilizing the resin substrate has flexibility so as to be bendable, thus being advantageous.
- However, in the structure in which, as like as the glass substrate, the transparent electrode and the metal auxiliary electrode are laminated on the substrate, it is obliged for the transparent electrode to be formed at a low temperature less than 100° C. because of heat resistant property of the resin substrate. The transparent electrode thus formed at the low temperature has a nature, different from that formed at a high temperature of more than 200° C., that is easily eroded by acid. This nature will be also applied to the case of using the mixture acid of phosphoric acid and nitric acid, and the surface of the transparent electrode is corroded and made coarse by such acid at the time of the patterning. On such surface, leak or dark spot is likely generated, which results in inadequate display.
- An object of the present invention is to substantially eliminate defects or drawbacks encountered in the prior art described above and to provide a luminescent display device capable of keeping smoothness of a surface of a transparent electrode and obtaining a good displaying result in a case of laminating a transparent electrode and an auxiliary electrode on a resin substrate and also provide a method of manufacturing such luminescent display device.
- To achieve the above object and solve the problem raised in the case of preparing the organic EL element on the resin substrate, the inventors of the subject application developed a technology of preparing the organic EL display element on the resin substrate by providing a new layer structure of resin substrate/auxiliary electrode/transparent electrode which is different from the conventional layer structure of glass substrate/transparent electrode/auxiliary electrode.
- The above and other objects can be achieved according to the present invention by providing, in one aspect, a luminescent display device comprising:
- a resin substrate having one and another surfaces;
- an auxiliary electrode made of metal and disposed on the one surface of the resin substrate;
- a transparent electrode disposed on the auxiliary electrode, the auxiliary electrode being conductive to the transparent electrode; and
- a luminescent layer composed of an organic compound and disposed on the transparent electrode.
- According to the above structure, the transparent electrode is formed after the formation and patterning of the metal auxiliary electrode, so that the transparent electrode never be eroded by an etching solution at the time of the patterning to the auxiliary electrode. Therefore, the surface of the transparent electrode can be kept smooth, and moreover, since the metal auxiliary electrode is covered by the transparent electrode, the oxidization of the metal auxiliary electrode can be prevented.
- In preferred embodiments of this aspect, a layer of metal oxide is further formed between the resin substrate and the auxiliary electrode.
- The metal oxide is formed of a conductive material, which is formed in form of film and is then subjected to a patterning treatment or process. The metal oxide is formed of an oxide including at least one of tin (Sn), zinc (Zn) and indium (In).
- The metal oxide is formed of an insulating material, which is formed in form of film. The metal oxide is formed of an oxide including at least one of aluminium (Al), zirconium (Zr), titanium (Ti), calcium (Ca), magnesium (Mg), chromium (Cr), nickel (Ni) and silica (Si).
- A moisture-proof layer may be further formed between the resin substrate and the metal oxide for shutting out moisture or water content.
- According to the above preferred embodiments, the location of the metal oxide layer between the resin substrate and the metal auxiliary electrode can improve the adhesive performance of the auxiliary electrode.
- When the metal oxide is formed of a conductive material, there may cause a case where the patterned respective auxiliary electrodes become conductive through the formation of the metal oxide layer below the auxiliary electrode. According to this invention, however, since the metal oxide layer is patterned in the same form as that of the auxiliary electrode, the above defect can be solved. On the other hand, when the metal oxide is formed of an insulating material, the patterned auxiliary electrode does not become conductive even if the metal oxide is disposed below the auxiliary electrode. Thus, the patterning process can be eliminated.
- The formation of the moisture-proof layer can shut out the invasion of the moisture or water content to the luminescent layer, thus maintaining the good light emission performance.
- The above objects can be also achieved by providing, in another aspect, a method of manufacturing the luminescent display device of the characters mentioned above, comprising the steps of:
- preparing a resin substrate having one and another surfaces;
- laminating an auxiliary electrode made of metal on the one surface of the resin substrate;
- laminating a transparent electrode on the auxiliary electrode, which is conductive to the transparent electrode; and
- laminating a luminescent layer composed of an organic compound on the transparent electrode.
- In this aspect, a metal oxide may be further formed on the one surface of the resin substrate before the lamination of the auxiliary electrode.
- The metal oxide is formed of a conductive material, which is formed in form of film, and is then subjected to a patterning treatment. The metal oxide may be formed of an insulating material, which is formed in form of film.
- The metal oxide and the auxiliary electrode are patterned at the same time by utilizing a photolithography technology or using an acid. The transparent electrode is formed in form of film through spattering, ion-plating or epitaxial growth treatment or process and then patterned by utilizing a photolithography technology or using an acid.
- According to this aspect, substantially the same effects or functions as those mentioned above may be achieved.
- Furthermore, it is to be noted that the present invention will be made further clear from the following descriptions made with reference to the accompanying drawings.
- In the accompanying drawings:
- FIG. 1 is an illustrated sectional view of a luminescent display device according to one embodiment of the present invention;
- FIG. 2 includes views representing a manufacturing steps of the luminescent display device of FIG. 1;
- FIG. 3 includes views representing a manufacturing steps of a luminescent display device prepared for a comparison (Comparative Example 1) with the embodiment of the present invention of FIG. 1;
- FIG. 4 includes views representing a manufacturing steps of a luminescent display device prepared for another comparison (Comparative Example 2) with the embodiment of the present invention of FIG. 1; and
- FIG. 5 includes views representing a manufacturing steps of a luminescent display device having a conventional structure.
- The present invention will be described hereunder with reference to FIG. 1
- Referring to FIG. 1 showing one embodiment of a
luminescent display device 11 of the present invention, theluminescent display device 11 includes aresin substrate 11 on which an organic electro-luminescent (EL) element having a laminated structure is disposed. The laminated structure of the organic EL element comprises a layer composed of ametal oxide 12, anauxiliary electrode 13 of conductive metal material, atransparent electrode 14 and aluminescent layer 15 composed of an organic compound, these materials and electrodes being laminated in the described order on theresin substrate 11. - It is first to be noted that, in the illustrated and described embodiment of the present invention, the subject feature resides in its laminated layer structure of
metal oxide 12/metal auxiliary electrode 13/transparent electrode 14 disposed on theresin substrate 11. - In the present embodiment, the
resin substrate 11 has a transparent or translucent (semi-transparent) property with respect to a visible light and has, for example, a thickness of 0.2 mm. Theresin substrate 11 has at least one surface formed with moisture-proof layer 19 shutting out moisture or water content.Such resin substrate 11 may preferably be formed from a liquid crystal substrate having a base material of PC (polycarbonate). However, the material and thickness of theresin substrate 11 are not limited to the above ones in the present invention. - The
metal oxide layer 12 is formed on theresin substrate 11. Thismetal oxide layer 12 is formed for the purpose of enhancing or improving adhesion performance between theresin substrate 11 and themetal auxiliary electrode 13. - In the present invention, for the
metal oxide 12, an indium-tin oxide is used, and the thin layer of themetal oxide 12 is formed by or through a vacuum evaporation, spattering, ion-plating or epitaxial growth treatment or process. This thin layer in form of film (film shape) is subjected to a patterning treatment so as to provide the same plane shape as that of theauxiliary electrode 13 in the patterning treatment of theauxiliary electrode 13 which is carried out thereafter. - In the case where the
metal oxide 12 is formed from a conductive material, there may cause a case that the patternedauxiliary electrodes 13 are made conductive when the metal oxide layers 12 are formed below the layers of theauxiliary electrodes 13, respectively. In order to eliminate such defect of electrical conduction of theauxiliary electrodes 13, themetal oxides 12 are patterned together with theauxiliary electrodes 13. - In this embodiment, although the indium-tin oxide is utilized as the
metal oxide 12, another one may be utilized as far as it can ensure good adhesion property between the metal oxide of thin film and the transparent or translucent metalauxiliary electrode 12. Further, in the case where the patterning is required as in the present embodiment, there will be used an oxide, asmetal oxide 12, including at least either one of tin (Sn), zinc (Zn) and indium (In). In a case where the metal oxide is formed of an insulating material, it is not necessary to carry out the patterning treatment as in the present embodiment. There will be used, asmetal oxide 12 formed of insulating material, an oxide including at last one of aluminium (Al), zirconium (Zr), titanium (Ti), calcium (Ca), magnesium (Mg), chromium (Cr), nickel (Ni), silica (Si) and the like. - The
metal auxiliary electrode 13 is laminated on themetal oxide layer 12 so as to be electrically conductive to thetransparent electrode 14 for the purpose of realizing a reduced resistance of thetransparent electrode 14. Theauxiliary electrode 13 is formed by forming a thin metal film through a vacuum evaporation, spattering, ion-plating or epitaxial growth treatment or process, and thereafter, the thus formed thin metal film is patterned by utilizing a photolithography technology or using acid or like. At the time of the patterning treatment to the metal thin film, themetal oxide 12 disposed below theauxiliary electrode 13 is also subjected to the patterning treatment together with theauxiliary electrode 13. Suchauxiliary electrode 13 may be formed from an alloy of silver (Ag), chromium (Cr), molybdenum (Mo), copper (Cu), aluminium (Al) or like. - On the
auxiliary electrode 13, is disposed thetransparent electrode 14 as anode. Thetransparent electrode 14 has transparent or translucent property with respect to visual light, and for example, is formed of a conductive material such as an oxide of indium-tin, an oxide of indium-zinc, or like. Suchtransparent electrode 14 is formed by first forming a thin film of oxide through vacuum evaporation, spattering, ion-plating or epitaxial growth treatment or process, and thereafter, by patterning the thus formed thin film. Thetransparent electrode 14 is formed so as to provide a stripe plane shape. - Furthermore, the
luminescent layer 15 is further formed on thetransparent electrode 14 by evaporating and spattering an organic compound. Theluminescent layer 15 formed of the organic compound may have a single layer structure having only one organic layer or have a multi (plural) layer structure in which a plurality of functions such as luminous function, carrier conveying function or like function are endowed separately to the respective layers. - On the
luminescent layer 15, there is further disposed ametal electrode 16 as cathode, which is formed into a film shape and then patterned. Themetal electrode 16 is formed as a thin metal film so as to provide a stripe shape normal to thetransparent electrode 14. - As mentioned above, the EL element is composed of the
metal oxide 12, theauxiliary electrode 13, thetransparent electrode 14, theluminescent layer 15 and themetal electrode 16, which are disposed in this order on one surface (upper surface as viewed in FIG. 1) of theresin substrate 11, and are covered by aseal layer 17. Theseal layer 17 is formed of a silicon nitride, epoxy resin or like material and disposed for the purpose of shutting out the invasion of moisture or water content in the atmospheric air into theluminescent layer 15. - When a direct current (DC) field is applied between the transparent electrode (anode)14 and the metal electrode (cathode), positive holes are injected from the anode into the
luminescent layer 15 and electrons are also injected from the cathode thereinto, whereby the organic compound in theluminescent layer 15 is emitted and the emitted light is taken out through another surface (lower surface as viewed in FIG. 1) side of theresin substrate 11. - FIG. 2 includes several views representing the manufacturing steps of the luminescent display device of FIG. 1 of the present invention.
- First, the
transparent resin substrate 11 is prepared (step S1). In the next step (step S2), a moisture-proof layer 19 is formed in form of film on at least one surface of theresin substrate 11 through the evaporation, spattering, ion-plating, epitaxial growth treatment or process, or like process. Thereafter, themetal oxide layer 12 is formed, in form of film, on the moisture-proof layer 19 through the spattering, ion-plating or epitaxial growth treatment or process (step S3). Further, in the next step (step S4), theauxiliary electrode 13 is then formed in form of film on the layer of themetal oxide 12 through the evaporation, spattering, ion-plating or epitaxial growth treatment or process. Next, theauxiliary electrode 13 and themetal oxide 12 are subjected together to the patterning treatment by utilizing photolithography technology or using an acid (step S5). Thetransparent electrode 14 is further formed in form of film on the same surface side of theresin substrate 11 through, as that mentioned above, the spattering process, ion-plating process or epitaxial growth process (step S6). Thistransparent electrode 14 is then patterned by utilizing the photolithography technology or using an acid (step S7). - After the above steps, the
luminescent layer 15 is formed in form of film by carrying out the evaporation, spattering, spin-coat, screen printing or fine-grain spraying treatment or process to an organic compound. Thereafter, themetal electrode 16 is formed on theluminescent layer 15 by utilizing the evaporation process, spattering process or photolithography technology, or using an acid. - As mentioned above, according to the present invention, the
transparent electrode 14 is formed in form of film after the forming and patterning treatments of themetal auxiliary electrode 13, so that there is no fear of erosion of thetransparent electrode 14 by the etching solution at the time of patterning of theauxiliary electrode 13. For this advantage, the surface of thetransparent electrode 14 can be kept smooth and fine luminescent condition can be maintained. Moreover, since themetal auxiliary electrode 13 is covered by thetransparent electrode 14, the oxidation of themetal auxiliary electrode 13 can be prevented. Furthermore, since themetal oxide layer 12 is interposed between theresin substrate 11 and theauxiliary electrode 13, the adhesion property of theauxiliary electrode 13 to theresin substrate 11 can be improved. - A preferred example of luminescent display device manufactured by the present invention will be compared hereunder with comparative examples.
- In accordance with the steps S1 and S2 in FIG. 2, the moisture-
proof layer 19 was first formed in form of film for shutting out moisture or water content from the surface of theresin substrate 11. Thereafter, indium-tin oxide was spattered in form of film asmetal oxide 12 on the moisture-proof layer 19, and silver-palladium copper alloy was spattered so as to form themetal auxiliary electrode 13 in form of film (steps S3 and S4 in FIG. 2). Then, themetal oxide 12 and theauxiliary electrode 13 were patterned so as to provide substantially the same shape, and thereafter, indium-tin oxide was spattered so as to provide thetransparent electrode 14 in form of film (steps S5 and S6 in FIG. 2). Thetransparent electrode 14 was then patterned so as to form an electrode for the organic EL element (step S7 in FIG. 2). - When the organic EL element was formed on the
transparent electrode 14 and was emitted, even emission could be obtained. - With reference to FIG. 3 representing a series of steps S1 to S6 for manufacturing a comparative example 1. In steps S1 to S2, the
resin substrate 11 was prepared and the moisture-proof layer 19, in form of film, for shutting out the moisture or water content was formed on the surface of theresin substrate 11. Thereafter, indium-tin oxide was spattered so as to provide thetransparent electrode 14 in form of film and then patterned (steps S3 and S4 in FIG. 3). Next, silver-palladium copper alloy was spattered so as to form themetal auxiliary electrode 13, in form of film, on thetransparent electrode 14, and then patterned as an electrode for an organic EL element (steps S5 and S6 in FIG. 3). - When the organic EL element was formed on the
auxiliary electrode 13 and was emitted, a number of dark-spots appeared, being defective. It was found that such defect was based on that, at the time of the patterning of themetal auxiliary electrode 13, thetransparent electrode 14 was eroded by an etching solution. - With reference to FIG. 4 representing a series of steps S1 to S6 for manufacturing a comparative example 2. An organic EL element was formed on the
resin substrate 11 in accordance with these steps. In steps S1 to S2, theresin substrate 11 was prepared and the moisture-proof layer 19, in form of film, for shutting out the moisture or water content was formed on theresin substrate 11. Thereafter, copper-palladium silver alloy was spattered so as to form themetal auxiliary electrode 13, in form of film, and then patterned (steps S3 and S4 in FIG. 4). Next, indium-tin oxide was spattered so as to provide thetransparent electrode 14 in form of film and then patterned so as to provide an electrode for an organic EL element (steps S5 and S6 in FIG. 4). During these manufacturing steps, there caused a problem that themetal auxiliary electrode 13 was peeled from theresin substrate 11. - As described above with reference to the preferred example of the present invention and comparative examples, in the present invention, the transparent electrode is formed after the formation and patterning of the metal auxiliary electrode, and accordingly, the transparent electrode is never eroded by the etching solution at the patterning treatment of the auxiliary electrode. Because of this advantageous effect, the surface of the transparent electrode can be kept smooth and the fine illuminating condition can be maintained. Moreover, the metal auxiliary electrode can be prevented from being oxidized. Furthermore, the location of the metal oxide between the metal auxiliary electrode and the resin substrate can effectively improve the adhesion property of the metal film.
- Further, it is to be noted that the present invention is not limited to the described embodiment, and many other changes and modifications may be made without departing from the scopes of the appended claims.
- The present application claims priority under 35 U.S.C §119 to Japanese Patent Application No.2001-141198, filed on May 11, 2001 entitled “LUMINESCENT DISPLAY DEVICE AND METHOD OF MANUFACTURING SAME”. The contents of that application are incorporated herein by reference in their entirety.
Claims (13)
1. A luminescent display device comprising:
a resin substrate having one and another surfaces;
an auxiliary electrode made of metal and disposed on the one surface of the resin substrate;
a transparent electrode disposed on the auxiliary electrode, said auxiliary electrode being conductive to the transparent electrode; and
a luminescent layer composed of an organic compound and disposed on the transparent electrode.
2. A luminescent display device according to claim 1 , further comprising a layer of metal oxide formed between the resin substrate and the auxiliary electrode.
3. A luminescent display device according to claim 2 , wherein said metal oxide is formed of a conductive material, which is formed in form of film and is then subjected to a patterning treatment.
4. A luminescent display device according to claim 3 , wherein said metal oxide is formed of an oxide including at least one of tin (Sn), zinc (Zn) and indium (In).
5. A luminescent display device according to claim 2 , wherein said metal oxide is formed of an insulating material, which is formed in form of film.
6. A luminescent display device according to claim 5 , wherein said metal oxide is formed of an oxide including at least one of aluminium (Al), zirconium (Zr), titanium (Ti), calcium (Ca), magnesium (Mg), chromium (Cr), nickel (Ni) and silica (Si).
7. A luminescent display device according to claim 2 , further comprising a moisture-proof layer between the resin substrate and the metal oxide for shutting out moisture.
8. A method of manufacturing a luminescent display device comprising the steps of:
preparing a resin substrate having one and another surfaces;
laminating an auxiliary electrode made of metal on the one surface of the resin substrate;
laminating a transparent electrode on the auxiliary electrode, which is conductive to the transparent electrode; and
laminating a luminescent layer composed of an organic compound on the transparent electrode.
9. A manufacturing method according to claim 8 , further comprising the step of laminating a metal oxide on the one surface of the resin substrate before the lamination of said auxiliary electrode.
10. A manufacturing method according to claim 9 , wherein said metal oxide is formed of a conductive material, which is formed in form of film, and is then subjected to a patterning treatment.
11. A manufacturing method according to claim 9 , wherein said metal oxide is formed of an insulating material, which is formed in form of film.
12. A manufacturing method according to claim 9 , wherein said metal oxide and said auxiliary electrode are patterned at a same time by utilizing a photolithography technology or using an acid.
13. A manufacturing method according to claim 8 , wherein said transparent electrode is formed in form of film through spattering, ion-plating or epitaxial growth treatment or process and then patterned by utilizing a photolithography technology or using an acid.
Priority Applications (1)
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US10/747,088 US20040169467A1 (en) | 2001-05-11 | 2003-12-30 | Luminescent display device and method of manufacturing same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JPP2001-141198 | 2001-05-11 | ||
JP2001141198A JP2002343562A (en) | 2001-05-11 | 2001-05-11 | Light-emitting display device and its manufacturing method |
US10/138,641 US6696699B2 (en) | 2001-05-11 | 2002-05-06 | Luminescent display device and method of manufacturing same |
US10/747,088 US20040169467A1 (en) | 2001-05-11 | 2003-12-30 | Luminescent display device and method of manufacturing same |
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US10/138,641 Division US6696699B2 (en) | 2001-05-11 | 2002-05-06 | Luminescent display device and method of manufacturing same |
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US20040169467A1 true US20040169467A1 (en) | 2004-09-02 |
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US10/138,641 Expired - Lifetime US6696699B2 (en) | 2001-05-11 | 2002-05-06 | Luminescent display device and method of manufacturing same |
US10/747,088 Abandoned US20040169467A1 (en) | 2001-05-11 | 2003-12-30 | Luminescent display device and method of manufacturing same |
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US20080106191A1 (en) * | 2006-09-27 | 2008-05-08 | Seiko Epson Corporation | Electronic device, organic electroluminescence device, and organic thin film semiconductor device |
US20090179558A1 (en) * | 2008-01-10 | 2009-07-16 | Seiko Epson Corporation | Organic el panel and method for producing same |
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Also Published As
Publication number | Publication date |
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US6696699B2 (en) | 2004-02-24 |
US20020167269A1 (en) | 2002-11-14 |
JP2002343562A (en) | 2002-11-29 |
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