Patents by Inventor Michiko Okafuji
Michiko Okafuji 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: 20130015762Abstract: There is provided a PDP in which the structure of the periphery of a protective film is improved, excellent secondary electron emission property is exhibited, and improved efficiency and increased life can be expected. There is further provided a PDP in which occurrence of a discharge delay at the time of driving is prevented, and exhibition of high quality image display performance can be expected even in a high definition PDP that is driven at a high speed. Specifically, a crystalline film containing Sr in CeO2 in a concentration of 11.8 mol % to 49.4 mol % inclusive is formed on the surface of dielectric layer on the discharge space side as surface layer (protective film) having a thickness of about 1 ?m. High ? fine particles having secondary electron emission property higher than those of protective film are arranged thereon.Type: ApplicationFiled: May 2, 2011Publication date: January 17, 2013Applicant: PANASONIC CORPORATIONInventors: Yusuke Fukui, Mikihiko Nishitani, Masahiro Sakai, Michiko Okafuji, Yayoi Okui, Yosuke Honda, Yasuhiro Yamauchi, Osamu Inoue, Hiroshi Asano
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Patent number: 8222814Abstract: The present invention improves discharge characteristics of a protective layer in order to provide a PDP that exhibits excellent display performance even if the PDP is of a fine-cell structure. The present invention also provides a manufacturing method for the PDP. In particular, a protective layer 8 is composed of an MgO film layer 81 and an MgO particle layer 82 that is made of MgO particles 16. The MgO particles 16 are formed by burning an MgO precursor and satisfy that a/b?1.2, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 650 nm to 900 nm, exclusive of 900 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm.Type: GrantFiled: October 19, 2007Date of Patent: July 17, 2012Assignee: Panasonic CorporationInventors: Masaharu Terauchi, Yusuke Fukui, Takuji Tsujita, Michiko Okafuji, Mikihiko Nishitani
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Patent number: 8164259Abstract: A first aim of the present invention is to provide a PDP capable of stably delivering favorable image display performance and being driven with low power, by improving the surface layer to improve secondary electron emission characteristics and charge retention characteristics. A second aim of the present invention is to provide a PDP, in addition to having the above-mentioned effects, capable of reducing an aging time. In order to achieve these aims, a crystalline film of a film thickness of approximately 1 ?m is disposed as a surface layer (protective film) 8 on a surface of the dielectric layer 7 that faces a discharge space. The surface layer 8 is made by adding Sr to CeO2, and a concentration of Sr in the surface layer 8 is in a range of 11.8 mol % to 49.4 mol % inclusive. With this structure, an attempt is made to improve the secondary electron emission characteristics and aging characteristics in the surface layer 8.Type: GrantFiled: January 13, 2010Date of Patent: April 24, 2012Assignee: Panasonic CorporationInventors: Yusuke Fukui, Masahiro Sakai, Mikihiko Nishitani, Yosuke Honda, Michiko Okafuji, Yasuhiro Yamauchi
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Publication number: 20110298363Abstract: A first aim of the present invention is to provide a PDP capable of stably delivering favorable image display performance and being driven with low power, by improving the surface layer to improve secondary electron emission characteristics and charge retention characteristics. A second aim of the present invention is to provide a PDP, in addition to having the above-mentioned effects, capable of reducing an aging time. In order to achieve these aims, a crystalline film of a film thickness of approximately 1 ?m is disposed as a surface layer (protective film) 8 on a surface of the dielectric layer 7 that faces a discharge space. The surface layer 8 is made by adding Sr to CeO2, and a concentration of Sr in the surface layer 8 is in a range of 11.8 mol % to 49.4 mol % inclusive. With this structure, an attempt is made to improve the secondary electron emission characteristics and aging characteristics in the surface layer 8.Type: ApplicationFiled: January 13, 2010Publication date: December 8, 2011Applicant: PANASONIC CORPORATIONInventors: Yusuke Fukui, Masahiro Sakai, Mikihiko Nishitani, Yosuke Honda, Michiko Okafuji, Yasuhiro Yamauchi
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Patent number: 8004190Abstract: The present invention improves discharge characteristics of a protective layer in order to provide a PDP that exhibits excellent display performance even if the PDP is of a fine-cell structure. The present invention also provides a manufacturing method for the PDP. In particular, a protective layer 8 is composed of an MgO film layer 81 and an MgO particle layer 82 that is made of MgO particles 16. The MgO particles 16 are formed by burning an MgO precursor and satisfy that a/b?1, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 200 nm to 300 nm, exclusive of 300 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm.Type: GrantFiled: October 19, 2007Date of Patent: August 23, 2011Assignee: Panasonic CorporationInventors: Takuji Tsujita, Yusuke Fukui, Masaharu Terauchi, Mikihiko Nishitani, Michiko Okafuji, Shinichiro Ishino, Kaname Mizokami
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Publication number: 20110148744Abstract: A first aim of the present invention is to provide a PDP capable of stably delivering favorable image display performance and being driven with low power, by improving the surface layer to improve secondary electron emission characteristics and charge retention characteristics. A second aim of the present invention is to provide a PDP capable of displaying high-definition images even when the PDP is driven at high speed by preventing the discharge delay during driving. In order to achieve these aims, the surface layer (protective film) 8 of a film thickness of approximately 1 ?m is disposed on a surface of the dielectric layer 7 that faces a discharge space 15. The surface layer 8 includes CeO2 as the main component and Ba, and a concentration of Ba in the surface layer 8 is in a range of 16 mol % to 29 mol % inclusive. With this structure, an electron level having a certain depth is introduced in a forbidden band in the surface layer 8, or an electron level of a valence band is elevated to narrow a band gap.Type: ApplicationFiled: January 13, 2010Publication date: June 23, 2011Inventors: Yusuke Fukui, Masahiro Sakai, Mikihiko Nishitani, Yosuke Honda, Michiko Okafuji, Yasuhiro Yamauchi
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Patent number: 7932676Abstract: The present invention provides a plasma display panel (PDP) with a protective film improved so as to achieve a lower discharge starting voltage. A surface portion of the protective film 16 substantially is composed of magnesium (Mg), aluminum (Al), nitrogen (N), and oxygen (O). The protective film 16 is formed so that in the surface portion of the protective film 16, a ratio of the number of atoms of the aluminum to a total of the number of atoms of the magnesium and the number of atoms of the aluminum is at least 2.1% but not more than 66.5%, a ratio of the number of atoms of the nitrogen to a total of the number of atoms of the nitrogen and the number of atoms of the oxygen is at least 1.2% but not more than 17.2%, and a ratio of the total of the number of atoms of the nitrogen and the number of atoms of the oxygen to the total of the number of atoms of the magnesium and the number of atoms of the aluminum is at least 1.0 but not more than 1.35.Type: GrantFiled: July 16, 2009Date of Patent: April 26, 2011Assignee: Panasonic CorporationInventors: Mikihiko Nishitani, Masahiro Sakai, Yusuke Fukui, Yosuke Honda, Yasuhiro Yamauchi, Michiko Okafuji
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Publication number: 20100207524Abstract: The present invention provides a plasma display panel (PDP) with a protective film improved so as to achieve a lower discharge starting voltage. A surface portion of the protective film 16 substantially is composed of magnesium (Mg), aluminum (Al), nitrogen (N), and oxygen (O). The protective film 16 is formed so that in the surface portion of the protective film 16, a ratio of the number of atoms of the aluminum to a total of the number of atoms of the magnesium and the number of atoms of the aluminum is at least 2.1% but not more than 66.5%, a ratio of the number of atoms of the nitrogen to a total of the number of atoms of the nitrogen and the number of atoms of the oxygen is at least 1.2% but not more than 17.2%, and a ratio of the total of the number of atoms of the nitrogen and the number of atoms of the oxygen to the total of the number of atoms of the magnesium and the number of atoms of the aluminum is at least 1.0 but not more than 1.35.Type: ApplicationFiled: July 16, 2009Publication date: August 19, 2010Applicant: PANASONIC CORPORATIONInventors: Mikihiko Nishitani, Masahiro Sakai, Yusuke Fukui, Yosuke Honda, Yasuhiro Yamauchi, Michiko Okafuji
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Publication number: 20100181909Abstract: A plasma display panel demonstrating excellent image display performance by suppressing generation of initialization bright points through modification of the phosphor layer, and by eliminating variation in discharge characteristics between the discharge cells of each color. In addition to solving these problems, the luminance of the plasma display panel is also enhanced by using the ultraviolet rays emitted in the discharge space in order to promote the production of visible light on the front panel side. Specifically, the phosphor layer (14) is composed of a phosphor component and of MgO powder (16) disposed principally inside the phosphor layer and exposed towards the surface (140) facing the discharge space in order to impart secondary electron emission characteristics.Type: ApplicationFiled: April 15, 2008Publication date: July 22, 2010Inventors: Takuji Tsujita, Yusuke Fukui, Masaharu Terauchi, Mikihiko Nishitani, Shinichiro Ishino, Kaname Mizokami, Michiko Okafuji, Hiroshi Asano, Kyohei Yoshino
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Publication number: 20100096986Abstract: The present invention improves discharge characteristics of a protective layer in order to provide a PDP that exhibits excellent display performance even if the PDP is of a fine-cell structure. The present invention also provides a manufacturing method for the PDP. In particular, a protective layer 8 is composed of an MgO film layer 81 and an MgO particle layer 82 that is made of MgO particles 16. The MgO particles 16 are formed by burning an MgO precursor and satisfy that a/b?1, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 200 nm to 300 nm, exclusive of 300 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm.Type: ApplicationFiled: October 19, 2007Publication date: April 22, 2010Inventors: Takuji Tsujita, Yusuke Fukui, Masaharu Terauchi, Mikihiko Nishitani, Michiko Okafuji, Kaname Mizokami
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Patent number: 7687993Abstract: A technology effective for improving the luminous efficiency, lifetime, and color temperature of a PDP having phosphor layers of three colors is disclosed. A PDP comprises a plurality of narrow tubes (60) arrayed on a substrate (51). In each narrow tube (60), one of phosphor layers (61R; 61B, 61G) is formed and a discharge gas is contained. The compositions and pressures of the discharge gases are set within appropriate ranges respectively corresponding to the phosphor layers (61R, 61B, 61G). Consequently, the PDP can have a lengthened life-time and an improved luminous efficiency. Reductions of variation in breakdown voltage and adjustment of color temperature are also possible with this constitution.Type: GrantFiled: November 25, 2003Date of Patent: March 30, 2010Assignee: Panasonic CorporationInventors: Michiko Okafuji, Yukihiro Morita, Shinichiro Hashimoto, Masatoshi Kitagawa
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Publication number: 20100045573Abstract: The present invention improves discharge characteristics of a protective layer in order to provide a PDP that exhibits excellent display performance even if the PDP is of a fine-cell structure. The present invention also provides a manufacturing method for the PDP. In particular, a protective layer 8 is composed of an MgO film layer 81 and an MgO particle layer 82 that is made of MgO particles 16. The MgO particles 16 are formed by burning an MgO precursor and satisfy that a/b?1. 2, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 650 nm to 900 nm, exclusive of 900 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm.Type: ApplicationFiled: October 19, 2007Publication date: February 25, 2010Inventors: Masaharu Terauchi, Yusuke Fukui, Takuji Tsujita, Michiko Okafuji, Mikihiko Nishitana
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Publication number: 20080157672Abstract: Disclosed is a PDP and a manufacturing method therefor having improved display performance even if the PDP is of a fine-cell structure. A protective layer of the PDP is composed of an MgO film layer and an MgO particle layer that is made of MgO particles. The MgO particles are formed by burning an MgO precursor and satisfy that a/b?1, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 200 nm to 300 nm, exclusive of 300 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm. With provision of the MgO particle layer, the discharge characteristics of the protective layer improve (shorter discharge delay and less temperature dependence of the discharge delay). Consequently, the PDP is ensured to exhibit excellent display performance.Type: ApplicationFiled: December 27, 2007Publication date: July 3, 2008Inventors: Takuji Tsujita, Yusuke Fukui, Masaharu Terauchi, Mikihiko Nishitani, Michiko Okafuji, Shinichiro Ishino, Kaname Mizokami
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Publication number: 20080160346Abstract: Disclosed is a PDP and a manufacturing method therefor having improved display performance even if the PDP is of a fine-cell structure. The PDP has a protective layer that is composed of an MgO film layer and an MgO particle layer made of MgO particles. The MgO particles are formed by burning an MgO precursor and satisfy that a/b?1.2, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 650 nm to 900 nm, exclusive of 900 nm, and b denotes a spectrum integral value of a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm. The MgO particles have many high energy levels in the energy band and thus emission of initial electrons is caused more easily, which leads to suppress discharge delay and also to suppress temperature dependence of the discharge delay.Type: ApplicationFiled: December 27, 2007Publication date: July 3, 2008Inventors: Masaharu Terauchi, Yusuke Fukui, Takuji Tsujita, Michiko Okafuji, Mikihiko Nishitani
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Publication number: 20060082301Abstract: A technology effective for improving the luminous efficiency, lifetime, and color temperature of a PDP having phosphor layers of three colors is disclosed. A PDP comprises a plurality of narrow tubes (60) arrayed on a substrate (51). In each narrow tube (60), one of phosphor layers (61R; 61B, 61G) is formed and a discharge gas is contained. The compositions and pressures of the discharge gases are set within appropriate ranges respectively corresponding to the phosphor layers (61R, 61B, 61G). Consequently, the PDP can have a lengthened life-time and an improved luminous efficiency. Reductions of variation in breakdown voltage and adjustment of color temperature are also possible with this constitution.Type: ApplicationFiled: November 25, 2003Publication date: April 20, 2006Inventors: Michiko Okafuji, Yukihiro Morita, Shinichiro Hashimoto, Masatoshi Kitagawa
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Patent number: 6787829Abstract: A liquid crystal display panel of the invention is such that, in a pixel region defined by a region of the array substrate surrounded by a pair of image signal lines and a pair of scanning signal lines, of a line-shaped pixel electrode and a common electrode, the electrode that is disposed adjacent to and parallel to a signal line is made of an opaque conductor and at least one of the other electrodes is made of a transparent conductor. Adverse effects of the electric field formed between a signal line and an adjacent electrode thereto are suppressed and a sufficient aperture ratio is ensured by using a transparent conductor for the electrode contributing good display.Type: GrantFiled: December 5, 2001Date of Patent: September 7, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Hiroyuki Yamakita, Masanori Kimura, Michiko Okafuji, Satoshi Asada
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Publication number: 20020176043Abstract: A liquid crystal display panel of the invention is such that, in a pixel region defined by a region of the array substrate surrounded by a pair of image signal lines and a pair of scanning signal lines, of a line-shaped pixel electrode and a common electrode, the electrode that is disposed adjacent to and parallel to a signal line is made of an opaque conductor and at least one of the other electrodes is made of a transparent conductor. Adverse effects of the electric field formed between a signal line and an adjacent electrode thereto are suppressed and a sufficient aperture ratio is ensured by using a transparent conductor for the electrode contributing good display.Type: ApplicationFiled: December 5, 2001Publication date: November 28, 2002Inventors: Tetsuo Fukami, Katsuhiko Kumagawa, Hiroyuki Yamakita, Masanori Kimura, Michiko Okafuji, Satoshi Asada
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Patent number: 5660971Abstract: A thin film device includes a substrate, a conductive oxide film formed on the substrate, and a metal film formed on the substrate and in contact with at least a part of the conductive oxide film. The metal film includes aluminum and a metallic material. The metallic material has a standard electrode potential higher than the standard electrode potential of the aluminum so that the standard electrode potential of the metal film is higher than the reduction potential of the conductive oxide film.Type: GrantFiled: April 15, 1996Date of Patent: August 26, 1997Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Ikunori Kobayashi, Shinichiro Ishihara, Michiko Okafuji