Patents Assigned to Hitachi Electronic Devices
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Patent number: 7990361Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: GrantFiled: March 6, 2009Date of Patent: August 2, 2011Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 7753578Abstract: A liquid crystal display includes a liquid crystal display panel for modulating light to form an image, and a back light unit having a plurality of lamp tubes with outside electrodes and without inside electrodes. Each of the plurality of lamp tubes has a first outside electrode disposed at one end portion and a second outside electrode disposed at another end portion. The first outside electrode which is disposed at one of the plurality of lamp tubes is electrically connected with the first outside electrode disposed at an adjacent another of the plurality of lamp tubes by a conductive member, and the second outside electrode which is disposed at the one of said plurality of lamp tubes is electrically connected with the second outside electrode disposed at the adjacent another of the plurality of lamp tubes by a conductive member.Type: GrantFiled: January 2, 2009Date of Patent: July 13, 2010Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto
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Patent number: 7714954Abstract: Light-emitting elements can be accurately directly opposed to the entrance surface of a light guide at an accurate distance therefrom, and can be mounted on a single side of a printed circuit board together with other electronic components, whereby the number of manufacturing steps and the thickness of a liquid crystal display device can be reduced. The light guide and the printed circuit board are disposed on the back surface of the liquid crystal display panel, and the respective light-emitting elements are inserted through through-holes formed to extend through the printed circuit board, with the light-emitting portions of the respective light-emitting elements opposed to the entrance surface of the light guide. The light-emitting elements, together with the other electronic components, are mounted on the printed circuit board from one side. Electrodes of the light-emitting elements are bridged and secured to a mounting surface of the printed circuit board.Type: GrantFiled: December 30, 2008Date of Patent: May 11, 2010Assignees: Hitachi, Ltd, Hitachi Electronic Devices Co., Ltd.Inventors: Masayuki Aoyagi, Yasushi Morika
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Patent number: 7542108Abstract: In a liquid crystal display device, a transparent sheet TPS is provided to a surface of a diffusion plate SCT which faces a light source (cold cathode fluorescent lamps CFL). The whole or at least respective portions of four sides forming peripheries of the transparent sheet TPS and the diffusion plate SCT are adhered to each other using a pressure sensitive adhesive double-sided tape or the like thus sealing a gap defined between them in a complete state or in an incomplete state with respect to outside air so that the drying conditions at a liquid-crystal-display element side and a light-source side of the diffusing plate SCT become equal.Type: GrantFiled: November 10, 2005Date of Patent: June 2, 2009Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Ken Saito, Kazuhiro Ishida
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Patent number: 7518594Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight disposed behind the liquid crystal display panel. The backlight includes: a light source including a discharge tube having no electrodes therein, and first and second electrodes disposed outside the discharge tube; and a power source which supplies first and second high-frequency voltages to the first and second electrodes, respectively. The first and second electrodes are disposed at two ends of the discharge tube in a direction of a longitudinal axis thereof, respectively. A length of a first wiring for coupling the power source to the first electrode is approximately equal to a length of a second wiring for coupling the power source to the second electrode.Type: GrantFiled: April 4, 2007Date of Patent: April 14, 2009Assignees: Hitachi, Ltd., Hitachi Electronic Devices, Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 7486348Abstract: Light-emitting elements can be accurately directly opposed to the entrance surface of a light guide at an accurate distance therefrom, and can be mounted on a single side of a printed circuit board together with other electronic components, whereby the number of manufacturing steps and the thickness of a liquid crystal display device can be reduced. The light guide and the printed circuit board are disposed on the back surface of the liquid crystal display panel, and the respective light-emitting elements are inserted through through-holes formed to extend through the printed circuit board, with the light-emitting portions of the respective light-emitting elements opposed to the entrance surface of the light guide. The light-emitting elements, together with the other electronic components, are mounted on the printed circuit board from one side. Electrodes of the light-emitting elements are bridged and secured to a mounting surface of the printed circuit board.Type: GrantFiled: March 2, 2007Date of Patent: February 3, 2009Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Masayuki Aoyagi, Yasushi Morika
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Patent number: 7283194Abstract: A liquid crystal display includes a liquid crystal display panel which has first and second drain lines groups, a control circuit board which has a control unit, a first and second drain drivers groups connected to the corresponding first and second drain lines groups, a back light unit, a metal frame, and a shield member which shields against EMI. Both of the first and second drain drivers groups are arranged at a same peripheral side of the liquid crystal display panel. The control unit supplies first and second signals to the drain drivers groups via flexible printed circuits which are connected to the control circuit board. The control circuit board is sandwiched between the metal frame and the shield member, and the metal frame is arranged between the control circuit board and the liquid crystal display panel.Type: GrantFiled: November 23, 2005Date of Patent: October 16, 2007Assignees: Hitachi, ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto
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Patent number: 7218308Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: GrantFiled: August 26, 2005Date of Patent: May 15, 2007Assignees: Hitachi, Ltd., Hitachi Electronic Devices, Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 7202920Abstract: Light-emitting elements can be accurately directly opposed to the entrance surface of a light guide at an accurate distance therefrom, and can be mounted on a single side of a printed circuit board together with other electronic components, whereby the number of manufacturing steps and the thickness of a liquid crystal display device can be reduced. The light guide and the printed circuit board are disposed on the back surface of the liquid crystal display panel, and the respective light-emitting elements are inserted through through-holes formed to extend through the printed circuit board, with the light-emitting portions of the respective light-emitting elements opposed to the entrance surface of the light guide. The light-emitting elements, together with the other electronic components, are mounted on the printed circuit board from one side. Electrodes of the light-emitting elements are bridged and secured to a mounting surface of the printed circuit board.Type: GrantFiled: October 15, 2004Date of Patent: April 10, 2007Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Masayuki Aoyagi, Yasushi Morika
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Patent number: 7077543Abstract: A liquid crystal display having a liquid crystal display panel for modulating light to form an image and a back light unit having a plurality of lamp tubes without inside electrodes and which are discharged by outside electrodes disposed along an outer surface of the at least one lamp tube, the back light unit being disposed behind the liquid crystal display panel. One outside electrode disposed at the at least one of the plurality of lamp tubes is electrically connected with another outside electrode disposed at an another adjacent lamp tube.Type: GrantFiled: November 14, 2001Date of Patent: July 18, 2006Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto
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Patent number: 7075221Abstract: The present invention aims at maintaining the high focusing performance at a low deflection power in a single-beam projection tube which is used as a projection type TV receiver or a projector and is operated at a high voltage and with a high current. The neck outer diameter of a portion on which a deflection yoke is mounted is made smaller than the neck outer diameter of a portion which accommodates an electron gun.Type: GrantFiled: August 7, 2003Date of Patent: July 11, 2006Assignees: Hitachi, Ltd., Hitachi Electronic Devices, Ltd. Co.Inventors: Kouichi Saitou, Kazumasa Hirai, Tetsuo Asano, Kotaro Aoki, Yasuo Tanaka
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Patent number: 7061465Abstract: There is provided a liquid crystal display device having a longer useful life and in which its so-called picture frame area can be narrowed. The liquid crystal display device includes a liquid crystal display panel having a display part in its central portion and a backlight disposed on a back side of the liquid crystal display panel. The backlight includes a discharge tube having electrodes at least at its opposite ends, and the electrodes are disposed at the exterior of the discharge tube. The opposite end portions of the discharge tube where the respective electrodes are disposed are positioned to be superposed on the periphery of the liquid crystal display panel and are bent with an angle with respect to the central axis of the discharge tube.Type: GrantFiled: August 31, 2001Date of Patent: June 13, 2006Assignees: Hitachi, Ltd., Hitachi Electronics Devices Co., Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Shoichi Noguchi, Yoshiharu Takeda
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Patent number: 7045936Abstract: An improved coupler with contrast ribs for use in a projection system. The coupler supports a projection lens in alignment with a projection optical signal generation device (e.g., a Cathode Ray Tube). The contrast ribs minimize contrast distortion that occurs in the coupler. The coupler defines a cooling chamber between said projection lens and said projection signal generating device and is filled with liquid in order to transport the optical signal between the projection optical signal generation device and projection lens. The contrast ribs change the angle of reflection of stray light rays generated by the projection optical signal generation device and direct a portion of those stray light rays to other contrast ribs. The ribs are preferably coated with a chemical composition that helps allow the ribs to absorb a portion of each ray incident on the rib.Type: GrantFiled: September 5, 2003Date of Patent: May 16, 2006Assignee: Hitachi Electronic Devices (USA), Inc.Inventor: Scott Howland Baker
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Patent number: 6992736Abstract: A liquid crystal display device which efficiently introduces radiation light of light-emitting elements to a light guide body to thereby obtain a uniformly bright display screen. The liquid crystal display device includes a liquid crystal display panel, a light guide body installed at a back face of the liquid crystal display panel, a light-emitting element disposed proximate to a side wall of the light guide body, and a mold case having an elastic support structure which hold the light guide body and biases the light guide body toward the light-emitting element.Type: GrantFiled: January 24, 2003Date of Patent: January 31, 2006Assignees: Hitachi, Ltd., Hitachi Electronics Devices Co., Ltd.Inventors: Ken Saito, Toshiyuki Asou, Masahiko Kurihara
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Patent number: 6985131Abstract: In a liquid crystal display device having the so-called side-edge type backlight system which comprises: a liquid crystal display panel; a light guide plate being disposed opposite to a main surface of the liquid crystal panel; and a linear lamp being disposed along one of sides of the light guide plate, the present invention provides a plurality of grooves at a corner area of an edge of the light guide plate along which the linear lamp is disposed so that the plurality of grooves are extended in a direction slanted to the edge of the light guide plate. In accordance with this structural feature, the present invention enables a high quality image display performance of the liquid crystal display panel by suppressing the display irregularity appearing therein effectively.Type: GrantFiled: July 24, 2001Date of Patent: January 10, 2006Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Tomoaki Kawada, Akio Tezuka, Hisao Hirayama, Toshitsugu Miyawaki, Masataka Natori
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Patent number: 6956556Abstract: A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of transparent substrates, at least one of which has patterned electrodes on an inner surface thereof, and a backlight disposed behind the liquid crystal display panel. The backlight has at least one discharge tube including a sealed-off transparent tube, a phosphor film formed on an inner surface of the sealed-off transparent tube, and a discharge gas within the sealed-off transparent tube and plural electrodes spaced in a direction of an axis of the sealed-off transparent tube and positioned at least partially around a circumference of the sealed-off transparent tube. At least two adjacent ones of the plural electrodes is supplied with alternating voltages different in frequency from each other, respectively.Type: GrantFiled: May 17, 2001Date of Patent: October 18, 2005Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Toshihiro Yajima, Seiichi Nishiyama, Shigetake Takaku, Yoshiharu Takeda, Shigeo Mikoshiba, Tomokazu Shiga, Koji Hashimoto, Yusuke Baba
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Patent number: 6871962Abstract: A one piece, double gland, quad lobe design gasket system for use in a projection system that redundantly seals in the liquid present in a coupler supporting a projection lens in alignment with a projection optical signal generation device (e.g., a Cathode Ray Tube). The coupler defines a cooling chamber between said projection lens and said projection signal generating device and is filled with liquid in order to transport the optical signal between the projection optical signal generation device and projection lens while minimizing contrast distortion. In order to prevent leaking from the cooling chamber between the coupler and projection signal generation device, an improved sealing system is used by providing two separate channels in the coupler and using the integral double gland, quad lobe gasket. Each gland is placed in a corresponding groove in the coupler thus creating two separate lines of seal that keeps the liquid in the coupler from leaking out.Type: GrantFiled: September 5, 2003Date of Patent: March 29, 2005Assignee: Hitachi Electronic Devices, Inc.Inventor: Jeffrey Scott Kane
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Patent number: 6847159Abstract: The present invention aims at maintaining the high focusing performance with a low deflection power in a projection tube which is used as a projection type TV receiver or a projector and is operated at a high voltage and with a single-electron-beam high current. A neck outer diameter of a portion on which a deflection yoke is mounted is made smaller than a neck outer diameter of a portion which accommodates an electron gun. A final electrode of the electron gun has a diameter thereof gradually decreased toward a phosphor screen. The maximum anode voltage of the projection tube is set to equal to or more than 25 KV and the maximum beam current is set to equal to or more than 4 mA.Type: GrantFiled: August 24, 2001Date of Patent: January 25, 2005Assignees: Hitachi Ltd., Hitachi Electronic Devices, Co., Ltd.Inventors: Nobuyuki Suzuki, Kotaro Aoki, Kouichi Saitou, Shoji Shirai
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Patent number: 6825894Abstract: Light-emitting elements can be accurately directly opposed to the entrance surface of a light guide at an accurate distance therefrom, and can be mounted on a single side of a printed circuit board together with other electronic components, whereby the number of manufacturing steps and the thickness of a liquid crystal display device can be reduced. The light guide and the printed circuit board are disposed on the back surface of the liquid crystal display panel, and the respective light-emitting elements are inserted through through-holes formed to extend through the printed circuit board, with the light-emitting portions of the respective light-emitting elements opposed to the entrance surface of the light guide. The light-emitting elements, together with the other electronic components, are mounted on the printed circuit board from one side. Electrodes of the light-emitting elements are bridged and secured to a mounting surface of the printed circuit board.Type: GrantFiled: May 9, 2002Date of Patent: November 30, 2004Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Masayuki Aoyagi, Yasushi Morika
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Patent number: 6815913Abstract: The present invention provides a cathode ray tube which exhibits a favorable contrast by enhancing a speed modulation effect. A front-stage anode electrode and a focus electrode which constitute an electron gun are respectively divided into a plurality of portions. A plurality of portions of the divided front-stage anode electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. A plurality of portions of the divided focus electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. Due to gaps formed in the front-stage anode electrode and the focus electrode, the speed modulation effect is increased.Type: GrantFiled: July 12, 2002Date of Patent: November 9, 2004Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Syoichi Wakita, Nobuyuki Suzuki, Toshio Nakayama, Yasuo Tanaka, Kouichi Harasaka