Patents by Inventor Shizuo Tokito
Shizuo Tokito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20060132461Abstract: A flexible display of the present invention is an active matrix flexible display in which a TFT is provided for each pixel. In the flexible display, an adhesive layer, a protective layer, a gate electrode for the TFT, which is buried in the protective layer, a gate insulating layer for the TFT, source and drain electrodes for the TFT, a pixel electrode electrically connected to the drain electrode, an organic active layer for the TFT, an organic EL layer including a red (R) emitting layer, a green (G) emitting layer and a blue (B) emitting layer, which are formed on a plurality of the pixel electrodes, a metal electrode, and a sealing layer are formed on a plastic film.Type: ApplicationFiled: November 3, 2005Publication date: June 22, 2006Applicants: KYODO PRINTING CO., LTD., NIPPON HOSO KYOKAIInventors: Tadahiro Furukawa, Shizuo Tokito, Youji Inoue, Mitsunori Suzuki
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Patent number: 6777111Abstract: In order to provide an electro luminescent element with high heat endurance and low crystallinity using functional molecules having functions of hole transporting, luminescence, and electron transporting, an electro luminescent element according to the present invention comprises one or more organic compound layers 14 between a first electrode 12 and a second electrode 16, wherein at least one of the organic compound layers 14 is a condensed ring compound derivative represented by the following chemical formula, in which A1 and A2 represent substituents, B1 through B6 represent directly connected or di functional substituents, and R1 and R2 represent functional units having each of the functions of hole transporting, luminescence, and electron transporting, such as triphenylamine, coumarin, and oxadiazole derivative.Type: GrantFiled: August 3, 2000Date of Patent: August 17, 2004Assignee: Kabushiki Kaisha Chuo KenkyushoInventors: Hiromitsu Tanaka, Makoto Mouri, Hisato Takeuchi, Shizuo Tokito
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Patent number: 6730418Abstract: Quinoline derivatives represented by formula (1) wherein two or more of substituents R1 to R7 are each a group of formula (2). In general formula (2), Q is a carbo- or hetero-aryl group; and the number (n) of double bonds is preferably 1 to 3. Use of such derivatives in an organic EL device provided with a layer of an organic compound and two electrodes sandwiching the layer as the organic compound gives devices emitting yellow to red light with high brightness and high efficiency. Further, doping a hole transport layer with such derivatives realizes organic EL devices capable of emitting lights of resultant colors (e.g., white) composed of lights from light-emitting and hole transport layers.Type: GrantFiled: June 13, 2002Date of Patent: May 4, 2004Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Makoto Mouri, Hisato Takeuchi, Hiromitsu Tanaka, Tomohiko Mori, Masahiko Ishii, Koji Noda, Shizuo Tokito
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Publication number: 20030176520Abstract: 4-Cyanocoumarin derivatives which have a distinct sensitivity to visible light, distinct luminescent ability, and satisfactory applicability for photochemical polymerization, dye lasers, and organic electroluminescent elements. Since most of the derivatives have a fluorescent maximum wavelength of 600 to 650 nm, particularly, 610 to 630 nm, they are extremely useful as luminescent agents for organic EL elements which emit visible light in a red-color region, and can be quite useful as luminescent agents in organic EL elements and laser-active substances in dye lasers, as well as luminous bodies as lighting sources for lighting devices, and information displays for visually displaying information.Type: ApplicationFiled: January 21, 2003Publication date: September 18, 2003Applicant: KABUSHIKI KAISHA HAYASHIBARA SEIBUTSU KAGAKU KENKYUJOInventors: Yoshio Taniguchi, Toshiki Koyama, Chihaya Adachi, Tomoyasu Saitou, Makoto Satsuki, Akira Shinpo, Sadaharu Suga, Shizuo Tokito, Hisayoshi Fujikawa, Koji Noda, Atsushi Miura, Yasunori Taga
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Patent number: 6573380Abstract: 4-Cyanocoumarin derivatives which have a distinct sensitivity to visible light, distinct luminescent ability, and satisfactory applicability for photochemical polymerization, dye lasers, and organic electroluminescent elements. Since most of the derivatives have a fluorescent maximum wavelength of 600 to 650 nm, particularly, 610 to 630 nm, they are extremely useful as luminescent agents for organic EL elements which emit visible light in a red-color region, and can be quite useful as luminescent agents in organic EL elements and laser-active substances in dye lasers, as well as luminous bodies as lighting sources for lighting devices, and information displays for visually displaying information.Type: GrantFiled: October 22, 2001Date of Patent: June 3, 2003Assignee: Kabushiki Kaisha Hayashibara Seibutsu Kagaku KenkyujoInventors: Yoshio Taniguchi, Toshiki Koyama, Chihaya Adachi, Tomoyasu Saitou, Makoto Satsuki, Akira Shinpo, Sadaharu Suga, Shizuo Tokito, Hisayoshi Fujikawa, Koji Noda, Atsushi Miura, Yasunori Taga
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Publication number: 20030091862Abstract: An organic polymeric phosphorescent compound that is stable and emits very highly efficient phosphorescence, used as a material of an organic light-emitting device is provided. Also, an organic light-emitting device employing the organic polymeric phosphorescent compound's provided. The phosphorescent compound according to the present invention is a neutral organic polymeric phosphorescent compound emitting phosphorescence and used in an organic light-emitting device, characterized in that a phosphorescent unit being a repeat unit for emitting phosphorescence and a carrier transporting unit being a repeat unit for transporting a carrier are included.Type: ApplicationFiled: August 30, 2002Publication date: May 15, 2003Applicant: NIPPON HOSO KYOKAIInventors: Shizuo Tokito, Mitsunori Suzuki, Isao Tanaka, Youji Inoue, Koro Shirane, Masataka Takeuchi, Naoko Ito
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Publication number: 20030012980Abstract: Quinoline derivatives represented by formula (1) wherein two or more of substituents R1 to R7 are each a group of formula (2). It is preferable that among the substituents R1 to R7, at least one of the substituents other than those of general formula (2) be an electron-whithdrawing group. In general formula (2), Q is a carbo- or hetero-aryl group; at least one of the substituents RQ on the group Q is preferably an electron-donating group; and the number (n) of double bonds is preferably 1 to 3. Use of such derivatives in an organic EL device provided with a layer of an organic compound and two electrodes sandwiching the layer as the organic compound gives devices emitting yellow to red light with high brightness and high efficiency. Further, doping a hole transport layer with such derivatives realizes organic EL devices capable of emitting lights of resultant colors (e. g., white) composed of lights from light-emitting and hole transport layers.Type: ApplicationFiled: June 13, 2002Publication date: January 16, 2003Inventors: Makoto Mouri, Hisato Takeuchi, Hiromitsu Tanaka, Tomohiko Mori, Masahiko Ishii, Koji Noda, Shizuo Tokito
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Patent number: 6416887Abstract: An organic EL element has an anode, a cathode, and one or more organic compound layers sandwiched between the anode and cathode, wherein at least one layer of said organic compound layers includes an organic compound denoted by chemical formula (1), which is more specifically denoted by chemical formulas (2)-(5). By introducing desired substituents at R1-R4, these compounds can be made to demonstrate hole transport function, emissive function, electron transport function, or a combination of those functions. Due to its tendency to be structurally non-planar, the organic compound does not crystallize easily, and has a high glass transition temperature. Use of such a compound in an organic EL element enhances element life.Type: GrantFiled: July 11, 2000Date of Patent: July 9, 2002Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Shizuo Tokito, Koji Noda, Hisayoshi Fujikawa, Masahiko Ishii, Yasunori Taga, Makoto Kimura, Yasuhiko Sawaki
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Patent number: 6406801Abstract: An optical resonator type organic electroluminescent element has a multilayered film mirror 30, a transparent electrode 12, an electron hole transportation layer 14 and a luminescent layer 16 configuring an organic layer, and a metallic electrode mirror 20, formed on a glass substrate 10. The optical resonator type organic electroluminescent element amplifies a specific wavelength (especially, in a range of about 30 nm toward a shorter wavelength side from a luminescence peak wavelength of the organic layer) in luminescence light by a minute optical resonator, which comprises the multilayered film mirror 30 and the metallic electrode mirror 20. It is determined that the minute optical resonator has an optical length L which is twice as long as a resonance wavelength, the organic layer has a thickness of 100 nm or more, and the transparent electrode has a thickness of 50 nm or more or a thickness so to have a sheet resistance of 30 &OHgr;/□ or less.Type: GrantFiled: February 3, 1999Date of Patent: June 18, 2002Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Shizuo Tokito, Koji Noda, Hisayoshi Fujikawa, Yasunori Taga
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Publication number: 20020052501Abstract: 4-Cyanocoumarin derivatives which have a distinct sensitivity to visible light, distinct luminescent ability, and satisfactory applicability for photochemical polymerization, dye lasers, and organic electroluminescent elements. Since most of the derivatives have a fluorescent maximum wavelength of 600 to 650 nm, particularly, 610 to 630 nm, they are extremely useful as luminescent agents for organic EL elements which emit visible light in a red-color region, and can be quite useful as luminescent agents in organic EL elements and laser-active substances in dye lasers, as well as luminous bodies as lighting sources for lighting devices, and information displays for visually displaying information.Type: ApplicationFiled: October 22, 2001Publication date: May 2, 2002Applicant: KABUSHIKI KAISHA HAYASHIBARA SEIBUTSU KAGAKU KENKYUJOInventors: Yoshio Taniguchi, Toshiki Koyama, Chihaya Adachi, Tomoyasu Saitou, Makoto Satsuki, Akira Shinpo, Sadaharu Suga, Shizuo Tokito, Hisayoshi Fujikawa, Koji Noda, Atsushi Miura, Yasunori Taga
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Patent number: 6355773Abstract: The invention features a functional polymer which provides three primary colors and is free from aggregation of high molecular chains. The functional polymer is obtained by copolymerization of fluorene unit and acene unit having three or more benzene rings or hetero rings, and has the structure denoted by the following formula: wherein A through H are selected from alkyl, thioalkyl, alkoxy, aryl, aryloxy, or the like; I and K through W are selected from C, O, N, P, S, and Si, R1 and R2 are selected from alkyl (iso or normal), cycloalkyl, acyl, or the like; p and q are integer numbers which satisfy p+q≧2; and n and m are integers equal to or greater than 1.Type: GrantFiled: November 22, 2000Date of Patent: March 12, 2002Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Karl-Heinz Weinfurtner, Hisayoshi Fujikawa, Shizuo Tokito, Yasunori Taga
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Patent number: 6259423Abstract: For use in a display device, a simple-matrix-drive-type luminescent panel is formed by stacking a dielectric mirror layer, a transparent electrode, a hole transport layer, a luminous layer, and a metal electrode on a glass substrate, wherein the transparent electrode is formed as a plurality of stripes equally spaced apart a specified distance from each other, and the metal electrode is formed as a plurality of stripes equally spaced apart a specified distance from each other and arranged at right angles with the transparent electrode stripes, and pixels are formed at intersections of the metal electrodes and the transparent electrodes and wherein in order for the pixels of the panel to emit light to display information, the application of a voltage to the pixels is controlled by selection of the electrodes according to information. This luminescent panel contributes to reductions in size and weight of the display device.Type: GrantFiled: August 17, 1998Date of Patent: July 10, 2001Assignee: Kabushiki Kaisha Toyoto Chuo KenkyushoInventors: Shizuo Tokito, Yasunori Taga
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Patent number: 6036823Abstract: A thin-film electroluminescent device includes dielectric layers having improved dielectric characteristics. The device is fabricated by forming a first transparent electrode layer of ITO, a first dielectric layer, a luminescent layer, a second dielectric layer, and a second transparent electrode layer of ITO in this order on an insulating substrate. Each of the two dielectric layers is a film constituted by TaSnON. That is, the film includes tantalum, tin, oxygen, and nitrogen.Type: GrantFiled: July 30, 1998Date of Patent: March 14, 2000Assignee: Denso CorporationInventors: Kazuhiro Inoguchi, Yutaka Hattori, Nobuei Ito, Tomoya Uchida, Tadashi Hattori, Koji Noda, Hisayoshi Fujikawa, Shizuo Tokito, Yasunori Taga
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Patent number: 5789860Abstract: A thin-film electroluminescent device includes dielectric layers having improved dielectric characteristics. The device is fabricated by forming a first transparent electrode layer of ITO, a first dielectric layer, a luminescent layer, a second dielectric layer, and a second transparent electrode layer of ITO in this order on an insulating substrate. Each of the two dielectric layers is a film constituted by TaSnON. That is, the film includes tantalum, tin, oxygen, and nitrogen.Type: GrantFiled: August 12, 1996Date of Patent: August 4, 1998Assignees: Nippondenso Co., Ltd., Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Kazuhiro Inoguchi, Yutaka Hattori, Nobuei Ito, Tomoya Uchida, Tadashi Hattori, Koji Noda, Hisayoshi Fujikawa, Shizuo Tokito, Yasunori Taga
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Patent number: 5783292Abstract: In order to fabricate an organic electroluminescent device with good thermal stability and such high durability that its light emission efficiency is retained over a predetermined level for a long time, an anode is formed on a substrate, one or more organic-inorganic compound layers are formed on the anode, and a cathode is formed on the organic compound layers, sequentially. At least one of the organic compound layers comprises a mixed thin film composed of an organic compound dispersed uniformly in an inorganic compound, or a superlattice structure made of an organic compound and an inorganic compound for preventing the thermal degradation of a fluorescent organic compound constituting an emission layer.Type: GrantFiled: September 28, 1995Date of Patent: July 21, 1998Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Shizuo Tokito, Yasunori Taga
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Patent number: 5780174Abstract: A micro-optical resonator type organic electroluminescent device utilizing an organic electroluminescent material high in emission efficiency but broad in emission spectrum width, has a narrow half bandwidth in the emission peak and a superior forward directivity and an excellent monochromaticity in light not separate into components, wherein a micro-optical resonator is formed by a multi-layered mirror and a metal mirror. The optical length of the micro-optical resonator, calculated from the total thickness and the refractive index of a transparent conductive layer and a luminous layer placed between the multi-layered mirror and the metal mirror and also from the light penetration depth into the multi-layered mirror, is 1.5 times the wavelength of a desired light emitted from the device, and the desired light is set on the short wavelength side of the emission spectrum of the electroluminescent material.Type: GrantFiled: October 25, 1996Date of Patent: July 14, 1998Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Shizuo Tokito, Koji Noda, Yasunori Taga
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Patent number: 5171632Abstract: Shaped articles such as fibers, films, tapes, rods and the like are fabricated from composites of nonconducting, flexible chain carrier polymers and conductive, conjugated polymers. The shaped, composite articles are electrically conductive and also display excellent mechanical properties, i.e., with respect to tensile strength, elongation at break, and the like. Methods of preparing the novel composite articles are disclosed as well.Type: GrantFiled: January 24, 1990Date of Patent: December 15, 1992Assignee: Regents of the University of CaliforniaInventors: Alan J. Heeger, Paul Smith, Shizuo Tokito, Jeffrey D. Moulton, Shizuo Tokito