Patents by Inventor Takeshi Gotoh
Takeshi Gotoh 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: 20080062700Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.Type: ApplicationFiled: October 22, 2007Publication date: March 13, 2008Applicant: Sharp Kabushiki KaishaInventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
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Patent number: 7309146Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.Type: GrantFiled: April 6, 2005Date of Patent: December 18, 2007Assignee: Sharp Kabushiki KaishaInventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
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Publication number: 20070184966Abstract: To provide an aluminum nitride powder and an aluminum nitride sintered body which satisfy both high thermal conductivity of an aluminum nitride sintered body and reduction in the shrinkage factor at the time of sintering. An aluminum nitride powder characterized in that it has local maximum values in size in regions of from 3 to 15 ?m, from 0.5 to 1.5 ?m and 0.3 ?m or less, the proportions of particles in the respective regions are from 40 to 70%, from 25 to 40% and from 0.5 to 20% on the volume basis, and it has an oxygen amount of from 0.5 to 1.5 mass %. An aluminum nitride sintered body which is a sintered body of a powder mixture containing the above aluminum nitride powder and a sintering aid, characterized by having a thermal conductivity of at least 190 W/m·K and a shrinkage factor represented by the percentage of {(dimensions of the molded body before sintering)?(dimensions of the sintered body after sintering)}/(dimensions of the molded body before sintering) of at most 15%.Type: ApplicationFiled: March 29, 2005Publication date: August 9, 2007Applicant: KENKI KAGAKU KOGYO KABUSHIKI KAISHAInventors: Takeshi Gotoh, Hiroshi Murata, Kohki Ichikawa
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Patent number: 7169005Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.Type: GrantFiled: June 30, 2005Date of Patent: January 30, 2007Assignee: Sharp Kabushiki KaishaInventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
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Patent number: 7073933Abstract: A display device used for a display unit of portable electronic equipment, a light source device therefor and a light guide plate, suppressing dispersion in the brightness and featuring a high contrast and a good display quality. The constitution includes a light incidence surface on where light emitted from an LED falls, a light reflection surface formed facing the light incidence surface and reflects light from the light incidence surface, a light outgoing surface arranged between the light incidence surface and the light reflection surface, and has a circularly polarizing plate intimately adhered onto the surface thereof, and an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light outgoing surface as well as to the light reflection surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface.Type: GrantFiled: October 4, 2002Date of Patent: July 11, 2006Assignee: Sharp Kabushiki KaishaInventors: Takeshi Gotoh, Tetsuya Hamada, Toshihiro Suzuki, Tetsuya Kobayashi, Keiji Hayashi, Mari Sugawara
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Publication number: 20060139289Abstract: A liquid crystal display device includes a panel having pixel electrodes arranged at intersections of a plurality of signal lines via switching elements for transmitting display data and a plurality of scanning lines for transmitting control signals, and a control circuit for controlling the panel. The liquid crystal panel is divided into first pixel regions and second pixel regions adjacent to the first pixel regions. The control circuit carries out impulse driving in which the control signals transmitted to each of the scanning lines are activated two times in one frame period for displaying an image. The control circuit writes the display data in either one of the pixel regions and writes reset data in the other pixel regions when the control signals are activated once of the two times. By writing the reset data in the pixel regions, the display data written in an immediately preceding frame are reset.Type: ApplicationFiled: February 17, 2006Publication date: June 29, 2006Inventors: Hidefumi Yoshida, Seiji Tanuma, Takatoshi Mayama, Yuichi Inoue, Toshiaki Suzuki, Kazutaka Hanaoka, Takeshi Gotoh, Tetsuya Kobayashi, Makoto Ohashi, Hisashi Yamaguchi, Katsunori Tanaka, Koichi Katagawa
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Patent number: 7015632Abstract: The present invention relates to a light source device including discharge tubes that emit light by discharging in a thin atmosphere, a method of producing the light source device, and a display apparatus in which the light source device is employed. This light source device includes discharge tubes and a heat conductive member that is brought into contact with the neighboring area of the electrodes of the discharge tubes so as to locally cool down the neighboring area of the electrodes. In the light source device, a low heat conductivity member having lower heat conductivity than the heat conductive member is interposed between the heat conductive member and the discharge tubes. With such a structure, the luminance in the entire light source device can be increased and made uniform, and the reliability of the light source device can be increased accordingly.Type: GrantFiled: March 28, 2002Date of Patent: March 21, 2006Assignees: Sharp Kabushiki Kaisha, Fujitsu Kasei LimitedInventors: Tetsuya Kobayashi, Keiji Hayashi, Koshu Yonemura, Fumiaki Yamada, Kazumasa Kaiwa, Hiroyoshi Takahashi, Toshihiro Suzuki, Takeshi Gotoh, Tetsuya Hamada, Mari Sugawara, Seiji Hayashimoto
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Publication number: 20050276072Abstract: The invention relates to a backlight unit for liquid crystal displays, etc.; and its object is to provide a backlight unit not involving the problem that the emitted light leaks out of the optical waveguide, even when the space around the cold-cathode tubes in the light source unit for it is filled with a liquid of which the refractive index is nearly the same as that of the glass material that forms the outer wall of the cold-cathode tubes. The backlight unit comprises a housing 6 which houses cold-cathode tubes 2, 4 therein and of which the inner surface is coated with a light reflector 10; a transparent liquid filled in the housing 6; and an optical waveguide 1 made of a transparent substance and having a light-emitting surface S.Type: ApplicationFiled: October 1, 2003Publication date: December 15, 2005Applicant: FUJITSU DISPLAY TECHNOLOGIES CORPORATIONInventors: Keiji Hayashi, Takeshi Gotoh, Toshihiro Suzuki, Hisashi Yamaguchi, Tetsuya Kobayashi, Tetsuya Hamada, Mari Sugawara
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Publication number: 20050255784Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.Type: ApplicationFiled: June 30, 2005Publication date: November 17, 2005Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
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Publication number: 20050242693Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.Type: ApplicationFiled: June 30, 2005Publication date: November 3, 2005Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
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Publication number: 20050236948Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.Type: ApplicationFiled: June 30, 2005Publication date: October 27, 2005Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
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Publication number: 20050179352Abstract: A display device includes a backlight having a discharge tube and a reflector. A heat conduction member is attached to the reflector in contact with the discharge tube, so that a part of the discharge tube is locally cooled by the heat conduction member. Liquid mercury is collected at a first position in the discharge tube, and the backlight is assembled so that the heat conduction member or other cooling device is located at the first position. Also, the display device includes an optical sheet having a diffusion portion having projections containing scattering material particles.Type: ApplicationFiled: April 6, 2005Publication date: August 18, 2005Inventors: Keiji Hayashi, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Toshihiro Suzuki, Mari Sugawara, Akio Sotokawa, Seiji Hachisuka
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Patent number: 6882388Abstract: The present invention is a method of manufacturing a liquid crystal display device, wherein light having an exposure energy is irradiated on the surface of a photo-sensitive resin layer having a predetermined film thickness, and a distribution of thermal deformation characteristics in the thickness direction (or the plane direction) of the photo-sensitive resin layer is formed, then heat treatment is performed to form random undulation (micro-grooves or micro-wrinkles) on the surface of the photo-sensitive resin layer.Type: GrantFiled: January 18, 2002Date of Patent: April 19, 2005Assignee: Fujitsu Display Technologies CorporationInventors: Norio Sugiura, Katsufumi Ohmuro, Yoshio Koike, Kunihiro Tashiro, Takeshi Gotoh, Tetsuya Hamada, Keiji Hayashi, Toshihiro Suzuki, Tetsuya Kobayashi, Kimiaki Nakamura, Mari Sugawara
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Patent number: 6847424Abstract: A liquid-crystal display includes a reflective liquid-crystal panel, a light guiding plate disposed on the reflective liquid-crystal panel, a polarizer arranged between a liquid-crystal layer of the reflective liquid-crystal panel and the light guiding plate, and a light source disposed on a side surface of the light guiding plate. Light emitted from the light source propagates through the light guiding plate and has a primary direction. A smaller one of two angles between a projection of the primary direction onto the reflective liquid-crystal panel and an absorption axis of the light guiding plate is at least 50°. This resultantly improves performance of the liquid-crystal display.Type: GrantFiled: August 23, 2001Date of Patent: January 25, 2005Assignee: Fujitsu Display Technologies CorporationInventors: Takeshi Gotoh, Tetsuya Hamada, Tetsuya Kobayashi, Keiji Hayashi, Toshihiro Suzuki
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Patent number: 6819366Abstract: The display device includes a spatial modulator having a plurality of pixels and a periodical structural body having condenser elements corresponding to the pixels of the spatial modulator. Each of the pixels of the spatial modulator includes a plurality of color dots arranged in a first direction. A length of a peripheral region of the respective pixel encircling the plurality of color dots, measured in the first direction, is longer than a length of the condenser element of the periodical structural body, measured in the first direction. In addition, combinations of the pixels in the square, delta or mosaic arrangement with the condenser elements in the square, delta or mosaic arrangement are disclosed.Type: GrantFiled: January 14, 2003Date of Patent: November 16, 2004Assignee: Fujitsu LimitedInventors: Toshihiro Suzuki, Tetsuya Kobayashi, Takeshi Gotoh, Tetsuya Hamada, Keiji Hayashi, Mari Sugawara, Hisashi Yamaguchi, Junji Tomita, Hirokazu Aritake
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Patent number: 6655810Abstract: The invention relates to a backlight unit for liquid crystal displays, etc.; and its object is to provide a backlight unit not involving the problem that the emitted light leaks out of the optical waveguide, even when the space around the cold-cathode tubes in the light source unit for it is filled with a liquid of which the refractive index is nearly the same as that of the glass material that forms the outer wall of the cold-cathode tubes. The backlight unit comprises a housing 6 which houses cold-cathode tubes 2, 4 therein and of which the inner surface is coated with a light reflector 10; a transparent liquid filled in the housing 6; and an optical waveguide 1 made of a transparent substance and having a light-emitting surface S.Type: GrantFiled: March 30, 2001Date of Patent: December 2, 2003Assignee: Fujitsu Display Technologies CorporationInventors: Keiji Hayashi, Takeshi Gotoh, Toshihiro Suzuki, Hisashi Yamaguchi, Tetsuya Kobayashi, Tetsuya Hamada, Mari Sugawara
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Patent number: 6639642Abstract: A display device including a diffraction grating from which a diffracted light of the zeroth order and a diffracted light of the first order having different color light components emerge to establish color separation. An array of micro-lenses is arranged on a liquid crystal panel. The liquid crystal panel has a plurality of picture elements and each picture element includes a plurality of color display dots. The color display dots in each picture element are arranged in the vertical relationship and in the order of wavelength of the light. A green light component of diffracted light of the first order is made incident normal to the liquid crystal panel, and the diffracted light of the zeroth order passes through the liquid crystal panel at a greater angle relative to the normal to the liquid crystal panel.Type: GrantFiled: March 10, 2000Date of Patent: October 28, 2003Assignee: Fujitsu LimitedInventors: Toshihiro Suzuki, Yukio Iigahama, Hisashi Yamaguchi, Takeshi Gotoh, Tetsuya Hamada, Keiji Hayashi, Junji Tomita, Hirokazu Aritake, Tetsuya Kobayashi, Mari Sugawara, Motohiko Fukuhara, Koji Yoshioka, Kazuhiro Takahara
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Publication number: 20030174262Abstract: There is provided a liquid crystal display having good display characteristics and a method of driving the same. Pixel data is written in plural pixels on one gate bus line at a top end of a display area at a first point in time on a line sequential basis. At a second point in time, the writing of pixel data in pixels in an upper part of the screen is completed, and writing of pixel data in pixels in a lower part of the screen is started. At a third point in time, the writing of pixel data in the pixels in the lower part of the screen is completed. A fluorescent tube on the upper side of the screen is turned on for a period between a third point in time after the writing of pixel data in the upper part of the screen and a fourth point in time before writing of pixel data for the next frame is started and is turned off in other periods.Type: ApplicationFiled: March 11, 2003Publication date: September 18, 2003Applicant: FUJITSU DISPLAY TECHNOLOGIES CORPORATIONInventors: Mari Sugawara, Tetsuya Kobayashi, Tetsuya Hamada, Takeshi Gotoh, Keiji Hayashi, Toshihiro Suzuki
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Publication number: 20030137821Abstract: A display device used for a display unit of portable electronic equipment, a light source device therefor and a light guide plate, suppressing dispersion in the brightness and featuring a high contrast and a good display quality. The constitution includes a light incidence surface on where light emitted from an LED falls, a light reflection surface formed facing the light incidence surface and reflects light from the light incidence surface, a light outgoing surface arranged between the light incidence surface and the light reflection surface, and has a circularly polarizing plate intimately adhered onto the surface thereof, and an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light outgoing surface as well as to the light reflection surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface.Type: ApplicationFiled: October 4, 2002Publication date: July 24, 2003Applicant: FUJITSU DISPLAY TECHNOLOGIES CORP.Inventors: Takeshi Gotoh, Tetsuya Hamada, Toshihiro Suzuki, Tetsuya Kobayashi, Keiji Hayashi, Mari Sugawara
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Publication number: 20030098933Abstract: The display device includes a spatial modulator having a plurality of pixels and a periodical structural body having condenser elements corresponding to the pixels of the spatial modulator. Each of the pixels of the spatial modulator includes a plurality of color dots arranged in a first direction. A length of a peripheral region of the respective pixel encircling the plurality of color dots, measured in the first direction, is longer than a length of the condenser element of the periodical structural body, measured in the first direction. In addition, combinations of the pixels in the square, delta or mosaic arrangement with the condenser elements in the square, delta or mosaic arrangement are disclosed.Type: ApplicationFiled: January 14, 2003Publication date: May 29, 2003Applicant: Fujitsu LimitedInventors: Toshihiro Suzuki, Tetsuya Kobayashi, Takeshi Gotoh, Tetsuya Hamada, Keiji Hayashi, Mari Sugawara, Hisashi Yamaguchi, Junji Tomita, Hirokazu Aritake