Patents by Inventor Toshitsugu Miyawaki
Toshitsugu Miyawaki 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: 7663713Abstract: A liquid crystal display device includes a liquid crystal panel and an illumination device. The illumination device has a light guide plate and at least one spot light source on at least one side surface of the light guide plate. The light guide plate includes a large number of upper-surface arcuate cross-sectional grooves in a direction orthogonal to the one side surface on a surface thereof which faces the liquid crystal panel, and a large number of light-incident-surface arcuate cross-sectional grooves are formed in a thickness direction of the light guide plate on at least a portion of the one side surface which faces a position at which the spot light source is arranged. A relationship is provided between a contact angle Oa of the upper-surface arcuate cross-sectional grooves and a contact angle Ea of the light-incident-surface arcuate cross-sectional grooves.Type: GrantFiled: November 28, 2005Date of Patent: February 16, 2010Assignee: Hitachi Displays, Ltd.Inventors: Ken Saito, Shigeo Shimano, Hiroshi Nakamoto, Hiroyuki Yoshida, Hirokazu Yabe, Toshitsugu Miyawaki, Akiyoshi Tobe
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Publication number: 20060114372Abstract: A liquid crystal display device includes a liquid crystal panel and an illumination device. The illumination device has a light guide plate and at least one spot light source on at least one side surface of the light guide plate. The light guide plate includes a large number of upper-surface arcuate cross-sectional grooves in a direction orthogonal to the one side surface on a surface thereof which faces the liquid crystal panel, and a large number of light-incident-surface arcuate cross-sectional grooves are formed in a thickness direction of the light guide plate on at least a portion of the one side surface which faces a position at which the spot light source is arranged. A relationship is provided between a contact angle Oa of the upper-surface arcuate cross-sectional grooves and a contact angle Ea of the light-incident-surface arcuate cross-sectional grooves.Type: ApplicationFiled: November 28, 2005Publication date: June 1, 2006Inventors: Ken Saito, Shigeo Shimano, Hiroshi Nakamoto, Hiroyuki Yoshida, Hirokazu Yabe, Toshitsugu Miyawaki, Akiyoshi Tobe
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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: 6530671Abstract: A liquid crystal display having a liquid crystal display panel having a plurality of liquid crystal cells, and a back light that irradiates the liquid crystal display panel with irradiation light. The back light includes a light source, and a light guide plate having one side arranged adjacent the light source and having a planar surface with a plurality of small concaves. The planar surface is almost parallel to a liquid crystal cell face, and a plane shape of the small concaves is almost rectangular.Type: GrantFiled: December 28, 2001Date of Patent: March 11, 2003Assignees: Hitachi Electronic Devices Co. Ltd., Hitachi, Ltd.Inventors: Hitoshi Taniguchi, Yasuo Hira, Yuji Mori, Hisao Hirayama, Toshitsugu Miyawaki
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Patent number: 6522373Abstract: A light guide plate which can achieve improvement of back-lighting or front-lighting luminance without increase of luminance of a light source, and a liquid crystal display device using such a light guide plate. A large number of concave small dots are formed in a surface of the light guide plate opposite to a light emitting surface of the light guide plate which emits light to a liquid crystal cell array so that light incident on the light guide plate from the light source is reflected at the concave small dots in the direction toward the light emitting surface of the light guide plate.Type: GrantFiled: April 26, 2000Date of Patent: February 18, 2003Assignees: Hitachi, Ltd., Nitto Denko CorporationInventors: Yasuo Hira, Hitoshi Taniguchi, Toshitsugu Miyawaki, Shuji Yano
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Publication number: 20020085368Abstract: A liquid crystal display having a liquid crystal display panel having a plurality of liquid crystal cells, and a back light that irradiates the liquid crystal display panel with irradiation light. The back light includes a light source, and a light guide plate having one side arranged adjacent the light source and having a planar surface with a plurality of small concaves. The planar surface is almost parallel to a liquid crystal cell face, and a plane shape of the small concaves is almost rectangular.Type: ApplicationFiled: December 28, 2001Publication date: July 4, 2002Inventors: Hitoshi Taniguchi, Yasuo Hira, Yuji Mori, Hisao Hirayama, Toshitsugu Miyawaki
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Publication number: 20020030650Abstract: 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: ApplicationFiled: July 24, 2001Publication date: March 14, 2002Applicant: Hitachi,Ltd.Inventors: Tomoaki Kawada, Akio Tezuka, Hisao Hirayama, Toshitsugu Miyawaki, Masataka Natori
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Patent number: 6334689Abstract: A liquid crystal display includes a liquid crystal display panel having a plurality of liquid crystal cells and aback light that irradiates the liquid crystal display panel with irradiation light. The back light includes a light source and a light guide plate having one side arranged adjacent the light source and having a planar surface with a plurality of small concaves. The planar surface is substantially parallel to a liquid crystal cell face and a plane shape of the small concaves is substantially rectangular.Type: GrantFiled: February 25, 1999Date of Patent: January 1, 2002Assignees: Hitachi, Ltd., Hitachi Electronics Devices Co., Ltd.Inventors: Hitoshi Taniguchi, Yasuo Hira, Yuji Mori, Hisao Hirayama, Toshitsugu Miyawaki