Patents by Inventor Mutsumi Maehara

Mutsumi Maehara 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).

  • Patent number: 8305513
    Abstract: The present invention provides a liquid crystal display device in which a light transmitting conductive layer formed on a surface of a color filter substrate is electrically connected with a backlight lower frame using conductive rubber. One end of the conductive rubber is connected with the light transmitting conductive layer, and another end of the conductive rubber is connected with the backlight lower frame through a hole which is formed in a backlight upper frame. The liquid crystal display device of the present invention can remove static electricity charged in a surface of a display panel and, at the same time, can realize the narrowing of a picture frame and the reduction of thickness thereof.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: November 6, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norihisa Fukayama, Mutsumi Maehara
  • Patent number: 8199277
    Abstract: The liquid crystal display device includes a middle frame fixing a liquid crystal display panel, a lower frame having a first plate portion, and a lower cover having a second plate portion and a housing together with the upper cover. A pitch of first through holes formed in the lower frame and a pitch of second through holes formed in the lower cover differ from each other. By selecting a combination of the first through hole and the second through hole, by aligning the selected first through hole and second through hole, and by inserting an insert into the aligned first through hole and the second through hole, a relative positional relationship between the first through hole and the second through hole is fixed.
    Type: Grant
    Filed: February 5, 2010
    Date of Patent: June 12, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Norihisa Fukayama, Mutsumi Maehara
  • Patent number: 8134665
    Abstract: A liquid crystal display apparatus includes a first polarizer located on one side of a first substrate, a second polarizer located on the opposite side of a second substrate, a liquid crystal layer formed of liquid crystal molecules and between the first and the second substrates so that the liquid crystal molecules may be aligned in parallel to the first or the second substrate and to which an electric field is applied in parallel to the first substrate, and a lighting device. The first or the second polarizer includes a polarization layer and supporting materials located on both sides of the polarization layer, reducing light leakage and a color shift in a black display state when viewed from the oblique direction.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: March 13, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Daisuke Kajita, Ikuo Hiyama, Mutsumi Maehara, Yuka Utsumi
  • Patent number: 8059235
    Abstract: A liquid crystal display includes a pair of substrates having a polarizer, a liquid crystal layer sandwiched between the substrates of the pair, a color filter layer sandwiched between one of the substrates of the pair and the liquid crystal layer, a light source for supplying light to the pair of substrates, the liquid crystal layer, and the color filter layer. The color filter layer includes three filters for displaying blue, green and red. Only the green filter of the three filters selectively includes an absorbing component capable of absorbing a light spectrum within a wavelength range from 480 nm to 500 nm.
    Type: Grant
    Filed: February 2, 2009
    Date of Patent: November 15, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yuka Utsumi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondo, Mutsumi Maehara
  • Publication number: 20110164196
    Abstract: The present invention provides a liquid crystal display device in which a light transmitting conductive layer formed on a surface of a color filter substrate is electrically connected with a backlight lower frame using conductive rubber. One end of the conductive rubber is connected with the light transmitting conductive layer, and another end of the conductive rubber is connected with the backlight lower frame through a hole which is formed in a backlight upper frame. The liquid crystal display device of the present invention can remove static electricity charged in a surface of a display panel and, at the same time, can realize the narrowing of a picture frame and the reduction of thickness thereof.
    Type: Application
    Filed: March 17, 2011
    Publication date: July 7, 2011
    Inventors: Norihisa Fukayama, Mutsumi Maehara
  • Publication number: 20110116023
    Abstract: A liquid crystal display apparatus includes a first polarizer located on one side of a first substrate, a second polarizer located on the opposite side of a second substrate, a liquid crystal layer formed of liquid crystal molecules and between the first and the second substrates so that the liquid crystal molecules may be aligned in parallel to the first or the second substrate and to which an electric field is applied in parallel to the first substrate, and a lighting device. The first or the second polarizer includes a polarization layer and supporting materials located on both sides of the polarization layer, reducing light leakage and a colour shift in a black display state when viewed from the oblique direction.
    Type: Application
    Filed: January 21, 2011
    Publication date: May 19, 2011
    Inventors: Daisuke Kajita, Ikuo Hiyama, Mutsumi Maehara, Yuka Utsumi
  • Patent number: 7920238
    Abstract: A liquid crystal display apparatus includes a first polarizer located on one side of a first substrate, a second polarizer located on the opposite side of a second substrate, a liquid crystal layer formed of liquid crystal molecules and between the first and the second substrates so that the liquid crystal molecules may be aligned in parallel to the first or the second substrate and to which an electric field is applied in parallel to the first substrate, and a lighting device. The first or the second polarizer includes a polarization layer and supporting materials located on both sides of the polarization layer, reducing light leakage and a colour shift in a black display state when viewed from the oblique direction.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: April 5, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Daisuke Kajita, Ikuo Hiyama, Mutsumi Maehara, Yuka Utsumi
  • Patent number: 7911555
    Abstract: The present invention provides a liquid crystal display device in which a light transmitting conductive layer formed on a surface of a color filter substrate is electrically connected with a backlight lower frame using conductive rubber. One end of the conductive rubber is connected with the light transmitting conductive layer, and another end of the conductive rubber is connected with the backlight lower frame through a hole which is formed in a backlight upper frame. The liquid crystal display device of the present invention can remove static electricity charged in a surface of a display panel and, at the same time, can realize the narrowing of a picture frame and the reduction of thickness thereof.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: March 22, 2011
    Assignee: Hitachi Displays, Ltd.
    Inventors: Norihisa Fukayama, Mutsumi Maehara
  • Publication number: 20100201906
    Abstract: The liquid crystal display device includes a middle frame fixing a liquid crystal display panel, a lower frame having a first plate portion, and a lower cover having a second plate portion and a housing together with the upper cover. A pitch of first through holes formed in the lower frame and a pitch of second through holes formed in the lower cover differ from each other. By selecting a combination of the first through hole and the second through hole, by aligning the selected first through hole and second through hole, and by inserting an insert into the aligned first through hole and the second through hole, a relative positional relationship between the first through hole and the second through hole is fixed.
    Type: Application
    Filed: February 5, 2010
    Publication date: August 12, 2010
    Inventors: Norihisa FUKAYAMA, Mutsumi Maehara
  • Publication number: 20090141220
    Abstract: A liquid crystal display includes a pair of substrates having a polarizer, a liquid crystal layer sandwiched between the substrates of the pair, a color filter layer sandwiched between one of the substrates of the pair and the liquid crystal layer, a light source for supplying light to the pair of substrates, the liquid crystal layer, and the color filter layer. The color filter layer includes three filters for displaying blue, green and red. The green filter of the three filters selectively includes an absorbing component capable of absorbing a light spectrum within a wavelength range from 400 nm to 500 nm.
    Type: Application
    Filed: February 2, 2009
    Publication date: June 4, 2009
    Inventors: Yuka Utsumi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondo, Mutsumi Maehara
  • Patent number: 7489374
    Abstract: A normally-closed liquid crystal display includes a component to selectively absorb characteristic leakage light occurring at black representation. Therefore, when black is displayed, occurrence of unnecessary leakage light due to partial depolarization of polarized light caused by a component of an LCD panel can be suppressed. It is therefore possible to provide a liquid crystal display in which display performance of black is improved to clearly display black.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: February 10, 2009
    Assignee: Hitachi Displays, Ltd.
    Inventors: Yuka Utsumi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondo, Mutsumi Maehara
  • Publication number: 20090033825
    Abstract: The present invention provides a liquid crystal display device in which a light transmitting conductive layer formed on a surface of a color filter substrate is electrically connected with a backlight lower frame using conductive rubber. One end of the conductive rubber is connected with the light transmitting conductive layer, and another end of the conductive rubber is connected with the backlight lower frame through a hole which is formed in a backlight upper frame. The liquid crystal display device of the present invention can remove static electricity charged in a surface of a display panel and, at the same time, can realize the narrowing of a picture frame and the reduction of thickness thereof.
    Type: Application
    Filed: July 28, 2008
    Publication date: February 5, 2009
    Inventors: Norihisa Fukayama, Mutsumi Maehara
  • Patent number: 7292299
    Abstract: In an in-plane switching (ISP) mode controlling transmission and shielding of light by application of lateral electric field to liquid crystal molecules aligned in the direction in parallel to a substrate, increase in luminance or color shift at a black-representation area or upon black-representation condition at an inclined viewing angle is reduced. First and second polarizing plates sandwiching a liquid crystal layer each have a supporting member (plate) on at least either surface thereof. The supporting member on the inside surface of the first polarizing plate on the side of an illumination unit has a retardation in the thickness direction R1·h1 and the supporting member on the inside surface of the second polarizing plate has a retardation in the thickness direction R2·h2. In the O-mode, R1·h1>R2·h2 and in the E-mode, R1·h1<R2·h2.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: November 6, 2007
    Assignee: Hitachi Displays
    Inventors: Ikuo Hiyama, Shinichi Komura, Tsunenori Yamamoto, Yuka Utsumi, Mutsumi Maehara, Daisuke Kajita
  • Patent number: 7256763
    Abstract: In a liquid crystal display and a method of driving the same, the liquid crystal display includes: a liquid crystal display panel having a matrix of a plurality of pixels arrayed two dimensionally in a first direction and in a second direction crossing the first direction; and an illuminating device including a plurality of light sources facing the pixel matrix of the liquid crystal display panel. The plurality of light sources are arrayed in the first direction and grouped into a plurality of light source areas. The turn-on start timing of light sources in each light source area is set to a specific timing based on the input timing of the video signal to the selected pixel rows in the pixel matrix. Further, the turn-on and turn-off timings of the light source areas are set to specific conditions.
    Type: Grant
    Filed: June 10, 2004
    Date of Patent: August 14, 2007
    Assignee: Hitachi Displays, Ltd.
    Inventors: Takeshi Kaneki, Mutsumi Maehara
  • Publication number: 20050206817
    Abstract: A liquid crystal display apparatus includes a first polarizer located on one side of a first substrate, a second polarizer located on the opposite side of a second substrate, a liquid crystal layer formed of liquid crystal molecules and between the first and the second substrates so that the liquid crystal molecules may be aligned in parallel to the first or the second substrate and to which an electric field is applied in parallel to the first substrate, and a lighting device. The first or the second polarizer includes a polarization layer and supporting materials located on both sides of the polarization layer, reducing light leakage and a colour shift in a black display state when viewed from the oblique direction.
    Type: Application
    Filed: January 21, 2005
    Publication date: September 22, 2005
    Inventors: Daisuke Kajita, Ikuo Hiyama, Mutsumi Maehara, Yuka Utsumi
  • Publication number: 20050140855
    Abstract: A normally-closed liquid crystal display includes a component to selectively absorb characteristic leakage light occurring at black representation. Therefore, when black is displayed, occurrence of unnecessary leakage light due to partial depolarization of polarized light caused by a component of an LCD panel can be suppressed. It is therefore possible to provide a liquid crystal display in which display performance of black is improved to clearly display black.
    Type: Application
    Filed: December 23, 2004
    Publication date: June 30, 2005
    Inventors: Yuka Utsumi, Makiko Sugibayashi, Ikuo Hiyama, Katsumi Kondo, Mutsumi Maehara
  • Publication number: 20050068480
    Abstract: In an in-plane switching (ISP) mode controlling transmission and shielding of light by application of lateral electric field to liquid crystal molecules aligned in the direction in parallel to a substrate, increase in luminance or color shift at a black-representation area or upon black-representation condition at an inclined viewing angle is reduced. First and second polarizing plates sandwiching a liquid crystal layer each have a supporting member (plate) on at least either surface thereof. The supporting member on the inside surface of the first polarizing plate on the side of an illumination unit has a retardation in the thickness direction R1·h1 and the supporting member on the inside surface of the second polarizing plate has a retardation in the thickness direction R2·h2. In the O-mode, R1·h1>R2·h2 and in the E-mode, R1·h1<R2·h2.
    Type: Application
    Filed: September 30, 2004
    Publication date: March 31, 2005
    Inventors: Ikuo Hiyama, Shinichi Komura, Tsunenori Yamamoto, Yuka Utsumi, Mutsumi Maehara, Daisuke Kajita
  • Publication number: 20040252097
    Abstract: In a liquid crystal display and a method of driving the same, the liquid crystal display includes: a liquid crystal display panel having a matrix of a plurality of pixels arrayed two dimensionally in a first direction and in a second direction crossing the first direction; and an illuminating device including a plurality of light sources facing the pixel matrix of the liquid crystal display panel. The plurality of light sources are arrayed in the first direction and grouped into a plurality of light source areas. The turn-on start timing of light sources in each light source area is set to a specific timing based on the input timing of the video signal to the selected pixel rows in the pixel matrix. Further, the turn-on and turn-off timings of the light source areas are set to specific conditions.
    Type: Application
    Filed: June 10, 2004
    Publication date: December 16, 2004
    Inventors: Takeshi Kaneki, Mutsumi Maehara
  • Patent number: 6590327
    Abstract: A color cathode ray tube comprises a panel which outside surface is flat and inside surface has curvature, and a pressed shadow mask having a curved surface opposed to the panel inside surface. The curved surface of the shadow mask is such that the radius of curvature decreases approximately linearly as the position moves from the center to the periphery. Radii of curvature on the major axis, minor axis, and diagonal axis at positions having the same distance from the shadow mask center do not have large differences. This configuration can increase the mechanical strength of the shadow mask.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: July 8, 2003
    Assignee: Hitachi Ltd.
    Inventors: Takeharu Furusawa, Nobuhiko Hosotani, Mutsumi Maehara
  • Patent number: 6518696
    Abstract: A color cathode ray tube including a shadow mask assembly and an inner shield provided for the shadow mask assembly which are disposed within the tube. The shadow mask assembly includes a substantially rectangular shadow mask, a substantially rectangular mask frame, and a spring for mounting the shadow mask assembly in the panel of the cathode ray tube. The shadow mask has a curved surface having electron beam passing holes and a skirt folded from the margin of the curved surface and extending in a tube axis direction. At least one of the major and minor sides of the substantially rectangular shadow mask has a curvature convex to the tube axis with corners thereof being round and at least one of the major and minor sides of the substantially rectangular mask frame is linear or has a curvature concave to the tube axis with corners thereof being round.
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: February 11, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Hisashi Nose, Mutsumi Maehara, Tsuyoshi Iwata