Patents by Inventor Akio Tezuka
Akio Tezuka 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: 9256101Abstract: Liquid crystal display device preventing brightness reduction of a backlight even when a recess is formed in a lower frame accommodating the backlight and a light-emitting diode substrate mounted with a light-emitting diode is accommodated in the recess. A backlight includes a reflection member arranged on the back side of a light guide plate, and the light-emitting diode irradiating the light guide plate with illumination light from a side portion of the light guide plate. The recess protruding on the back side is formed in the lower frame for accommodating and arranging the light-emitting diode substrate mounted with the light-emitting diode therein. A part of an end portion of the reflection member protrudes into a space formed by the recess toward the light emitting diode. A holding member is arranged between the reflection member and the lower frame at least to hold the protruding region of the reflection member.Type: GrantFiled: September 24, 2013Date of Patent: February 9, 2016Assignee: JAPAN DISPLAY INC.Inventors: Saburo Watanabe, Akio Tezuka
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Patent number: 8730428Abstract: This invention provides a liquid crystal display device that makes it possible to ground the conductive film provided on the display side of the liquid crystal display panel without fail while making the frame narrower. The device has a liquid crystal display panel where a liquid crystal layer is provided between two facing substrates; a mold frame for holding the liquid crystal display panel in a predetermined position; a lower frame made of a metal for containing the mold frame; and first and second conductive members, and characterized in that a conductive film is formed on the display side of the liquid crystal display panel, the first conductive member is provided so as to make contact with the conductive film and an upper surface of the mold frame, and the second conductive member is provided so as to make contact with the first conductive member and the lower frame.Type: GrantFiled: February 11, 2011Date of Patent: May 20, 2014Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Hironobu Isami, Akio Tezuka, Fumiyuki Sato
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Publication number: 20140092336Abstract: Liquid crystal display device preventing brightness reduction of a backlight even when a recess is formed in a lower frame accommodating the backlight and a light-emitting diode substrate mounted with a light-emitting diode is accommodated in the recess. A backlight includes a reflection member arranged on the back side of a light guide plate, and the light-emitting diode irradiating the light guide plate with illumination light from a side portion of the light guide plate. The recess protruding on the back side is formed in the lower frame for accommodating and arranging the light-emitting diode substrate mounted with the light-emitting diode therein. A part of an end portion of the reflection member protrudes into a space formed by the recess toward the light emitting diode. A holding member is arranged between the reflection member and the lower frame at least to hold the protruding region of the reflection member.Type: ApplicationFiled: September 24, 2013Publication date: April 3, 2014Applicant: Japan Display Inc.Inventors: Saburo WATANABE, Akio Tezuka
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Patent number: 8537300Abstract: A display device includes a display panel unit and a backlight unit which radiates light toward the display panel. The display panel unit includes a display panel on an upper surface of a box-shaped panel housing which has first projecting portions on side walls of the housing. The backlight unit incorporates a light source in a bottom portion of a box-shaped light source housing which has second projecting portions on side walls of the light source housing. By bringing the first projecting portions and second projecting portions into contact with each other, a distance between the light source of the backlight unit and the display panel can be held. Further, by forming third projecting portions which project further than the first projecting portions on the panel housing, handling of the display panel unit is facilitated.Type: GrantFiled: February 5, 2010Date of Patent: September 17, 2013Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Yoshio Toriyama, Shinji Shimizu, Akio Tezuka, Masafumi Nagaoka
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Patent number: 8368837Abstract: A liquid crystal display device includes: a liquid crystal display panel; and a backlight disposed to face the liquid crystal display panel, the backlight including at least a frame having a bottom surface facing the liquid crystal display panel, a reflector placed on the bottom surface of the frame, and a plurality of light sources disposed on the liquid crystal display panel side of the reflector and supported by the frame, wherein a recess protruding in the opposite direction to the liquid crystal display panel is formed in the bottom surface of the frame, the recess and the reflector constituting an air duct.Type: GrantFiled: September 16, 2010Date of Patent: February 5, 2013Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Takayuki Ota, Akio Tezuka
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Patent number: 8184229Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight arranged on a back surface of the liquid crystal display panel, the backlight including a plurality of rod-shaped light sources, a frame which supports the rod-shaped light sources, and a heat radiation plate which is arranged on an inner surface of the frame. Through holes are formed in the frame, and heat radiation fins are formed on the heat radiation plate in a state that the heat radiation fins project toward a back surface of the liquid crystal display panel through the through holes formed in the frame. Due to such a constitution, it is possible to provide a liquid crystal display device which can enhance heat radiation efficiency.Type: GrantFiled: August 4, 2008Date of Patent: May 22, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Masafumi Nagaoka, Kazuyoshi Tanaka, Akio Tezuka, Takayuki Ota
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Publication number: 20110199554Abstract: This invention provides a liquid crystal display device that makes it possible to ground the conductive film provided on the display side of the liquid crystal display panel without fail while making the frame narrower. The device has a liquid crystal display panel where a liquid crystal layer is provided between two facing substrates; a mold frame for holding the liquid crystal display panel in a predetermined position; a lower frame made of a metal for containing the mold frame; and first and second conductive members, and characterized in that a conductive film is formed on the display side of the liquid crystal display panel, the first conductive member is provided so as to make contact with the conductive film and an upper surface of the mold frame, and the second conductive member is provided so as to make contact with the first conductive member and the lower frame.Type: ApplicationFiled: February 11, 2011Publication date: August 18, 2011Inventors: Hironobu ISAMI, Akio TEZUKA, Fumiyuki SATO
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Patent number: 7952682Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight disposed at the back of the liquid crystal display panel. The backlight includes a frame, a light source, a reflective sheet, and a heat dissipating plate formed in a rectangular shape and housing the light source, the reflective sheet, and the heat dissipating plate. The heat dissipating plate is disposed between the reflective sheet and a bottom surface of the frame and includes a first portion and a second portion facing the first portion, and has a plurality of first openings at the first portion and at least one second opening at the second portion. The plurality of first openings are formed along the first portion, and each of the first openings has a first edge and a first fin formed at a part of the first edge.Type: GrantFiled: January 19, 2011Date of Patent: May 31, 2011Assignee: Hitachi Displays, Ltd.Inventors: Masafumi Nagaoka, Takayuki Ota, Kazuyoshi Tanaka, Akio Tezuka
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Publication number: 20110110045Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight disposed at the back of the liquid crystal display panel. The backlight includes a frame, a light source, a reflective sheet, and a heat dissipating plate formed in a rectangular shape and housing the light source, the reflective sheet, and the heat dissipating plate. The heat dissipating plate is disposed between the reflective sheet and a bottom surface of the frame and includes a first portion and a second portion facing the first portion, and has a plurality of first openings at the first portion and at least one second opening at the second portion. The plurality of first openings are formed along the first portion, and each of the first openings has a first edge and a first fin formed at a part of the first edge.Type: ApplicationFiled: January 19, 2011Publication date: May 12, 2011Inventors: Masafumi Nagaoka, Takayuki Ota, Kazuyoshi Tanaka, Akio Tezuka
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Publication number: 20110069250Abstract: A liquid crystal display device includes: a liquid crystal display panel; and a backlight disposed to face the liquid crystal display panel, the backlight including at least a frame having a bottom surface facing the liquid crystal display panel, a reflector placed on the bottom surface of the frame, and a plurality of light sources disposed on the liquid crystal display panel side of the reflector and supported by the frame, wherein a recess protruding in the opposite direction to the liquid crystal display panel is formed in the bottom surface of the frame, the recess and the reflector constituting an air duct.Type: ApplicationFiled: September 16, 2010Publication date: March 24, 2011Inventors: Takayuki OTA, Akio Tezuka
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Patent number: 7876416Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight disposed at a rear surface of the liquid crystal display panel. The backlight includes a light source, a frame housing the light source, a heat dissipating plate disposed inside the frame, and a reflective sheet disposed at a surface of the heat dissipating plate on the liquid crystal display panel side. The heat dissipating plate is formed with a heat dissipating fin protruding to a surface of the frame on the side opposite to the liquid crystal display panel through an opening formed through the frame in a portion corresponding to the upper portion thereof and formed with an opening which is closed with the frame and the reflective sheet in a portion corresponding to the lower portion thereof.Type: GrantFiled: January 23, 2009Date of Patent: January 25, 2011Assignee: Hitachi Displays, Ltd.Inventors: Masafumi Nagaoka, Takayuki Ota, Kazuyoshi Tanaka, Akio Tezuka
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Publication number: 20100201907Abstract: A display device includes a display panel unit and a backlight unit which radiates light toward the display panel. The display panel unit includes a display panel on an upper surface of a box-shaped panel housing which has first projecting portions on side walls of the housing. The backlight unit incorporates a light source in a bottom portion of a box-shaped light source housing which has second projecting portions on side walls of the light source housing. By bringing the first projecting portions and second projecting portions into contact with each other, a distance between the light source of the backlight unit and the display panel can be held. Further, by forming third projecting portions which project further than the first projecting portions on the panel housing, handling of the display panel unit is facilitated.Type: ApplicationFiled: February 5, 2010Publication date: August 12, 2010Inventors: Yoshio TORIYAMA, Shinji Shimizu, Akio Tezuka, Masafumi Nagaoka
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Publication number: 20090190063Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight disposed at a rear surface of the liquid crystal display panel. The backlight includes a light source, a frame housing the light source, a heat dissipating plate disposed inside the frame, and a reflective sheet disposed at a surface of the heat dissipating plate on the liquid crystal display panel side. The heat dissipating plate is formed with a heat dissipating fin protruding to a surface of the frame on the side opposite to the liquid crystal display panel through an opening formed through the frame in a portion corresponding to the upper portion thereof and formed with an opening which is closed with the frame and the reflective sheet in a portion corresponding to the lower portion thereof.Type: ApplicationFiled: January 23, 2009Publication date: July 30, 2009Inventors: Masafumi NAGAOKA, Takayuki Ota, Kazuyoshi Tanaka, Akio Tezuka
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Patent number: 7527413Abstract: A liquid crystal display device has a liquid crystal display panel and a backlight. The backlight includes plural line light sources arranged in parallel with each other, a transparent optical plate disposed on a liquid-crystal-display-panel side of the line light sources, plural minute optical controlling elements formed on a liquid-crystal-display-panel-side surface of the transparent optical plate. The plural minute optical controlling elements extend in parallel with the line light sources, and are symmetrical in a cross section perpendicular to longitudinal axes of the plural line sources, between two adjacent midplanes each of which passes midway between two adjacent ones of the plural line light sources and each of which is perpendicular to the transparent optical plate.Type: GrantFiled: May 27, 2005Date of Patent: May 5, 2009Assignees: Hitachi Displays, Ltd., Hitachi Displays Devices, Ltd.Inventors: Nobuyuki Koganezawa, Akio Tezuka, Fumiyuki Sato
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Publication number: 20090040417Abstract: A liquid crystal display device includes a liquid crystal display panel and a backlight arranged on a back surface of the liquid crystal display panel, the backlight including a plurality of rod-shaped light sources, a frame which supports the rod-shaped light sources, and a heat radiation plate which is arranged on an inner surface of the frame. Through holes are formed in the frame, and heat radiation fins are formed on the heat radiation plate in a state that the heat radiation fins project toward a back surface of the liquid crystal display panel through the through holes formed in the frame. Due to such a constitution, it is possible to provide a liquid crystal display device which can enhance heat radiation efficiency.Type: ApplicationFiled: August 4, 2008Publication date: February 12, 2009Inventors: Masafumi Nagaoka, Kazuyoshi Tanaka, Akio Tezuka, Takayuki Ota
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Patent number: 7295263Abstract: A display device suitable for a game machine has dot printed films which are printed on a light guide plate which constitutes a backlight for illuminating a liquid crystal display panel. The dots of the dot printed films are arranged more densely in a window-frame portion corresponding region, which faces a display region of the liquid crystal display panel, and in the vicinity of an inner periphery of a transmission portion corresponding to a region which faces a transmission region.Type: GrantFiled: July 30, 2004Date of Patent: November 13, 2007Assignees: Hitachi Displays, Ltd., Hitachi Displays Devices, Ltd.Inventors: Yasuhisa Shiraishi, Hisao Hirayama, Akio Tezuka, Makoto Hasegawa
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Publication number: 20060013016Abstract: A liquid crystal display device has a liquid crystal display panel and a backlight. The backlight includes plural line light sources arranged in parallel with each other, a transparent optical plate disposed on a liquid-crystal-display-panel side of the line light sources, plural minute optical controlling elements formed on a liquid-crystal-display-panel-side surface of the transparent optical plate. The plural minute optical controlling elements extend in parallel with the line light sources, and are symmetrical in a cross section perpendicular to longitudinal axes of the plural line sources, between two adjacent midplanes each of which passes midway between two adjacent ones of the plural line light sources and each of which is perpendicular to the transparent optical plate.Type: ApplicationFiled: May 27, 2005Publication date: January 19, 2006Inventors: Nobuyuki Koganezawa, Akio Tezuka, Fumiyuki Sato
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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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Publication number: 20050024555Abstract: A display device suitable for a game machine has dot printed films which are printed on a light guide plate which constitutes a backlight for illuminating a liquid crystal display panel. The dots of the dot printed films are arranged more densely in a window-frame portion corresponding region, which faces a display region of the liquid crystal display panel, and in the vicinity of an inner periphery of a transmission portion corresponding to a region which faces a transmission region.Type: ApplicationFiled: July 30, 2004Publication date: February 3, 2005Inventors: Yasuhisa Shiraishi, Hisao Hirayama, Akio Tezuka, Makoto Hasegawa
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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