Patents by Inventor Kohji Ohtsuka
Kohji Ohtsuka 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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Patent number: 7901103Abstract: A backlight unit includes a fluorescent lamp to illuminate a liquid crystal panel, a reflection unit for causing the light from the fluorescent lamp to exit toward a certain direction, and a diffusion unit for diffusing the light from the fluorescent lamp and reflection unit, and reflectance or transmittance in the horizontal and vertical directions is controlled by applying a dot pattern that gradually increases densities from the central portion toward the peripheral portion to the reflection unit or diffusion unit, or by applying a dot pattern that gradually increases densities from the central portion toward the both ends in the longitudinal direction on the surface of the fluorescent tube of the fluorescent lamp. By doing this, brightness gradient is formed in the horizontal and vertical directions so that the brightness in the central portion of the liquid crystal panel is relatively higher than the brightness of the peripheral portion thereof.Type: GrantFiled: March 3, 2008Date of Patent: March 8, 2011Assignee: Sharp Kabushiki KaishaInventors: Yutaka Inoue, Kohji Ohtsuka, Kazuyoshi Izumi, Takashi Yoshii
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Patent number: 7455425Abstract: A backlight unit includes a fluorescent lamp to illuminate a liquid crystal panel, a reflection unit for causing the light from the fluorescent lamp to exit toward a certain direction, and a diffusion unit for diffusing the light from the fluorescent lamp and reflection unit, and reflectance or transmittance in the horizontal and vertical directions is controlled by applying a dot pattern that gradually increases densities from the central portion toward the peripheral portion to the reflection unit or diffusion unit, or by applying a dot pattern that gradually increased densities from the central portion toward the both ends in the longitudinal direction on the surface of the fluorescent tube of the fluorescent lamp. By doing this, brightness gradient is formed in the horizontal and vertical directions so that the brightness in the central portion of the liquid crystal panel is relatively higher than the brightness of the peripheral portion thereof.Type: GrantFiled: October 17, 2003Date of Patent: November 25, 2008Assignee: Sharp Kabushiki KaishaInventors: Yutaka Inoue, Kohji Ohtsuka, Kazuyoshi Izumi, Takashi Yoshii
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Patent number: 7446829Abstract: To compensate for uneven brightness in the longitudinal direction of fluorescent lamps of a backlight unit and achieve a display screen with an even brightness, a reflection unit of the backlight unit, the fluorescent tube surface of the fluorescent lamps or a diffusion unit is used to either reduce the reflectance, transmittance, or radiation brightness of the high-voltage side of the fluorescent lamps or increase the reflectance, transmittance, or radiation brightness of the low-voltage side thereof so as to compensate for uneven brightness of the illumination light and thereby ensure an even brightness. For example, dot pattern regions D1, D2 and D3, i.e., the regions whose density increases in stages, are imparted to the portion of a reflection layer 13 of the backlight unit with a relatively high brightness.Type: GrantFiled: September 26, 2003Date of Patent: November 4, 2008Assignee: Sharp Kabushiki KaishaInventors: Yutaka Inoue, Kohji Ohtsuka, Kazuya Idei, Masaki Shimizu, Takashi Yoshii
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Publication number: 20080158872Abstract: A backlight unit includes a fluorescent lamp to illuminate a liquid crystal panel, a reflection unit for causing the light from the fluorescent lamp to exit toward a certain direction, and a diffusion unit for diffusing the light from the fluorescent lamp and reflection unit, and reflectance or transmittance in the horizontal and vertical directions is controlled by applying a dot pattern that gradually increases densities from the central portion toward the peripheral portion to the reflection unit or diffusion unit, or by applying a dot pattern that gradually increases densities from the central portion toward the both ends in the longitudinal direction on the surface of the fluorescent tube of the fluorescent lamp. By doing this, brightness gradient is formed in the horizontal and vertical directions so that the brightness in the central portion of the liquid crystal panel is relatively higher than the brightness of the peripheral portion thereof.Type: ApplicationFiled: March 3, 2008Publication date: July 3, 2008Inventors: Yutaka INOUE, Kohji OHTSUKA, Kazuyoshi IZUMI, Takashi YOSHII
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Patent number: 7280665Abstract: An image display device has a main display body provided with a thin display unit, a low-frequency loudspeaker (woofer) and two middle and high frequency loudspeakers (tweeters) and a stand supporting the main display body. The stand has a base being just opposite at its top surface to a duct outlet of the woofer, thereby sound emitted from the duct can be constantly absorbed by and reflected from the base. A housing containing the first loudspeaker and a pair of the second loudspeakers has a plurality of through holes formed in a first area corresponding to an aperture of each loudspeaker and a plurality of blind holes formed in a second area surrounding the first area, wherein the second area for the first loudspeaker is different in peripheral shape and/or size from the second area for each of the second pair of loudspeakers.Type: GrantFiled: March 4, 2003Date of Patent: October 9, 2007Assignee: Sharp Kabushiki KaishaInventors: Ichiro Tamura, Kohji Ohtsuka
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Publication number: 20060139952Abstract: A backlight unit includes a fluorescent lamp to illuminate a liquid crystal panel, a reflection unit for causing the light from the fluorescent lamp to exit toward a certain direction, and a diffusion unit for diffusing the light from the fluorescent lamp and reflection unit, and reflectance or transmittance in the horizontal and vertical directions is controlled by applying a dot pattern that gradually increases densities from the central portion toward the peripheral portion to the reflection unit or diffusion unit, or by applying a dot pattern that gradually increases densities from the central portion toward the both ends in the longitudinal direction on the surface of the fluorescent tube of the fluorescent lamp. By doing this, brightness gradient is formed in the horizontal and vertical directions so that the brightness in the central portion of the liquid crystal panel is relatively higher than the brightness of the peripheral portion thereof.Type: ApplicationFiled: October 17, 2003Publication date: June 29, 2006Applicant: Sharp Kabushiki KaishaInventors: Yutaka Inoue, Kohji Ohtsuka, Kazuyoshi Izumi, Takashi Yoshii
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Publication number: 20060044830Abstract: To compensate for uneven brightness in the longitudinal direction of fluorescent lamps of a backlight unit and achieve a display screen with an even brightness, a reflection unit of the backlight unit, the fluorescent tube surface of the fluorescent lamps or a diffusion unit is used to either reduce the reflectance, transmittance, or radiation brightness of the high-voltage side of the fluorescent lamps or increase the reflectance, transmittance, or radiation brightness of the low-voltage side thereof so as to compensate for uneven brightness of the illumination light and thereby ensure an even brightness. For example, dot pattern regions D1, D2 and D3, i.e., the regions whose density increases in stages, are imparted to the portion of a reflection layer 13 of the backlight unit with a relatively high brightness.Type: ApplicationFiled: September 26, 2003Publication date: March 2, 2006Inventors: Yutaka Inoue, Kohji Ohtsuka, Kazuya Idei, Masaki Shimizu, Takashi Yoshii
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Patent number: 6979844Abstract: A low-resistance silicon baseplate (11) has formed thereon a buffer layer 12 in the form of an alternating lamination of AlN sublayers (12a) and GaN sublayers (12b). On this buffer layer there are formed an n-type semiconductor region (13) of gallium nitride, an active layer (14) of gallium indium nitride, and a p-type semiconductor region (15) of gallium nitride, in that order. An anode (17) is formed on the p-type semiconductor region (15), and a cathode (18) on the baseplate (11).Type: GrantFiled: March 21, 2003Date of Patent: December 27, 2005Assignee: Sanken Electric Co., Ltd.Inventors: Tetsuji Moku, Kohji Ohtsuka, Masataka Yanagihara, Masaaki Kikuchi
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Publication number: 20050247948Abstract: A low-resistance silicon baseplate (11) has formed thereon a buffer layer 12 in the form of an alternating lamination of AlN sublayers (12a) and GaN sublayers (12b). On this buffer layer there are formed an n-type semiconductor region (13) of gallium nitride, an active layer (14) of gallium indium nitride, and a p-type semiconductor region (15) of galliumnitride, in that order. An anode (17) is formed on the p-type semiconductor region (15), and a cathode (18) on the baseplate (11).Type: ApplicationFiled: July 19, 2005Publication date: November 10, 2005Inventors: Tetsuji Moku, Kohji Ohtsuka, Masataka Yanagihara, Masaaki Kikuchi
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Publication number: 20050129263Abstract: An image display device (10) has a main display body (1) provided with a thin display unit (2), a low-frequency loudspeaker (woofer) (3) and two middle and high frequency loudspeakers (tweeters) (4a, 4b) and a stand (8) supporting the main display body (1). The stand (8) has a base (6) being just opposite at its top surface to a duct outlet of the woofer (3) , thereby sound emitted from the duct can be constantly absorbed by and reflected from the base and provided with the stable quality without influence of the floor's material. A housing containing the first loudspeaker and a pair of the second loudspeakers has a plurality of through holes formed in a first area corresponding to an aperture of each loudspeaker (3, 4a, 4b) and a plurality of blind holes formed in a second area surrounding the first area, wherein the second area for the first loudspeaker is different in peripheral shape and/or size from the second area for each of the second pair of loudspeakers.Type: ApplicationFiled: March 4, 2003Publication date: June 16, 2005Applicant: Sharp Kabushiki KaishaInventors: Ichiro Tamura, Kohji Ohtsuka
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Publication number: 20030183835Abstract: A low-resistance silicon baseplate (11) has formed thereon a buffer layer 12 in the form of an alternating lamination of AlN sublayers (12a) and GaN sublayers (12b). On this buffer layer there are formed an n-type semiconductor region (13) of gallium nitride, an active layer (14) of gallium indium nitride, and a p-type semiconductor region (15) of galliumnitride, in that order. An anode (17) is formed on the p-type semiconductor region (15), and a cathode (18) on the baseplate (11).Type: ApplicationFiled: March 21, 2003Publication date: October 2, 2003Inventors: Tetsuji Moku, Kohji Ohtsuka, Masataka Yanagihara, Masaaki Kikuchi
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Publication number: 20020158253Abstract: A low-resistance silicon baseplate (11) has formed thereon a buffer layer 12 in the form of an altering lamination of AlN sublayers (12a) and GaN sublayers (12b). On this buffer layer there are formed an n-type semiconductor region (13) of gallium nitride, an active layer (14) of gallium indium nitride, and a p-type semiconductor region (15) of gallium nitride, in that order. An anode (17) is formed on the p-type semiconductor region (15), and a cathode (18) on the baseplate (11).Type: ApplicationFiled: October 15, 2001Publication date: October 31, 2002Inventors: Tetsuji Moku, Kohji Ohtsuka, Masataka Yanagihara, Masaaki Kikuchi