Patents by Inventor Ikuko Imajo

Ikuko Imajo 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: 10718966
    Abstract: A liquid crystal display device comprises: a first display panel including a first liquid crystal cell and a pair of first polarizing plates sandwiching the first liquid crystal cell; a second display panel including a second liquid crystal cell and a pair of second polarizing plates sandwiching the second liquid crystal cell; and a bonding member bonding one of the pair of first polarizing plates of the first display panel and one of the pair of second polarizing plates of the second display panel together. An end of the bonding member is located inside an end of the first polarizing plate and an end of the second polarizing plate.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: July 21, 2020
    Assignees: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD., PASONA KNOWLEDGE PARTNER INC.
    Inventors: Takao Imaoku, Kazuhiko Tsuda, Ikuko Imajo, Yusuke Katagiri
  • Publication number: 20200209668
    Abstract: A liquid crystal display device includes: a first display panel including a first liquid crystal cell; a second display panel including a second liquid crystal cell; and a bonding member that bonds the first and the second display panels together. The bonding member is made of a photocurable resin. In a section in a thickness direction of the first display panel and parallel to either a longitudinal axis direction or a latitudinal axis direction of the first display panel, a relative curing reaction rate at a central representative point of the bonding member is greater than a relative curing reaction rate at an end representative point of the bonding member. A difference between the relative curing reaction rate at the central representative point of the bonding member and the relative curing reaction rate at the end representative point of the bonding member falls within 4%.
    Type: Application
    Filed: December 18, 2019
    Publication date: July 2, 2020
    Inventors: Kazuhiko TSUDA, Takao IMAOKU, Ikuko IMAJO
  • Publication number: 20190041684
    Abstract: A liquid crystal display device comprises: a first display panel including a first liquid crystal cell and a pair of first polarizing plates sandwiching the first liquid crystal cell; a second display panel including a second liquid crystal cell and a pair of second polarizing plates sandwiching the second liquid crystal cell; and a bonding member bonding one of the pair of first polarizing plates of the first display panel and one of the pair of second polarizing plates of the second display panel together. An end of the bonding member is located inside an end of the first polarizing plate and an end of the second polarizing plate.
    Type: Application
    Filed: July 31, 2018
    Publication date: February 7, 2019
    Inventors: Takao IMAOKU, Kazuhiko TSUDA, Ikuko IMAJO, Yusuke KATAGIRI
  • Patent number: 9383604
    Abstract: A backlight includes light emitting diodes; a substrate on which light emitting diodes are mounted; and a reflection sheet. The surface on which the light emitting diodes are mounted of the substrate is opposed to a rear surface of the liquid crystal display panel. The liquid crystal display panel and the substrate each have a shape in which a common width in a first direction is longer than a width in a second direction, which is orthogonal to the first direction. The width of the substrate in the second direction is shorter than the width of the liquid crystal display panel in the second direction. The substrate is opposed to, while avoiding being opposed to both end portions of the liquid crystal display panel in the second direction, a central portion between the both end portions of the liquid crystal display panel.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: July 5, 2016
    Assignees: JAPAN DISPLAY INC., PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventors: Sachiko Yamazaki, Ikuko Imajo, Masashi Baba, Kikuo Ono
  • Patent number: 9036113
    Abstract: A backlight includes light emitting diodes; a substrate on which light emitting diodes are mounted; and a reflection sheet. The surface on which the light emitting diodes are mounted of the substrate is opposed to a rear surface of the liquid crystal display panel. The liquid crystal display panel and the substrate each have a shape in which a common width in a first direction is longer than a width in a second direction, which is orthogonal to the first direction. The width of the substrate in the second direction is shorter than the width of the liquid crystal display panel in the second direction. The substrate is opposed to, while avoiding being opposed to both end portions of the liquid crystal display panel in the second direction, a central portion between the both end portions of the liquid crystal display panel.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: May 19, 2015
    Assignees: JAPAN DISPLAY INC., PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventors: Sachiko Yamazaki, Ikuko Imajo, Masashi Baba, Kikuo Ono
  • Patent number: 9025087
    Abstract: A liquid crystal display device includes: a liquid crystal panel; a reflection sheet arranged on a rear surface side of the liquid crystal panel, the reflection sheet being curved so that a surface facing the liquid crystal panel is recessed; and a light emitting diode substrate including: a light emitting diode array in which a plurality of light emitting diodes are arranged along a longitudinal direction; and electrodes connected to the plurality of light emitting diodes. In a circle which is centered at one light emitting diode and whose diameter is a distance from the one light emitting diode to another light emitting diode adjacent to the one light emitting diode, an area of the electrode connected to a high temperature side electrode of the one light emitting diode is larger than an area of the electrode connected to a low temperature side electrode of the one light emitting diode.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: May 5, 2015
    Assignee: Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Ikuko Imajo
  • Patent number: 8994894
    Abstract: In a liquid crystal display device including a backlight unit that irradiates the entire image formation region with light from light emitting diodes disposed in a concentrated manner, in order to reduce warpage of a reflection sheet to obtain uniform illumination, provided is a liquid crystal display device (1), including: a liquid crystal panel (3); a reflection sheet (6), which is disposed on a rear surface side of the liquid crystal panel (3) and is curved so as to have a concave surface facing the liquid crystal panel (3); a light emitting diode substrate on which a plurality of light emitting diodes (14) are disposed along a horizontal direction; and a support (21) for fixing the reflection sheet (6) at a curved portion of the reflection sheet (6).
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: March 31, 2015
    Assignee: Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Sachiko Yamazaki, Ikuko Imajo, Masashi Baba
  • Publication number: 20140340297
    Abstract: In a liquid crystal display device that performs horizontal divisional-drive operation, writing of a pixel voltage to pixels in a head row in vertical scanning of each display region becomes insufficient, and a dark line is displayed when the head row is located at the screen center, deteriorating the image quality. For example, a scanning line drive circuit to drive gate lines of a lower display region sequentially outputs a scanning pulse (Pk) for selecting a (n+k)th row of an image. A video line drive circuit to drive source lines of the lower display region outputs a pixel voltage corresponding to data (Dn+k) during a period of the scanning pulse (Pk). An application start timing of the pixel voltage with respect to application of the scanning pulse (Pk) is set earlier in a (n+1)th row, a head row, during an effective scanning period (TEFF) than in the subsequent rows.
    Type: Application
    Filed: August 1, 2014
    Publication date: November 20, 2014
    Inventors: Ryutaro OKE, Ikuko IMAJO, Junichi MARUYAMA
  • Publication number: 20140340616
    Abstract: A backlight includes light emitting diodes; a substrate on which light emitting diodes are mounted; and a reflection sheet. The surface on which the light emitting diodes are mounted of the substrate is opposed to a rear surface of the liquid crystal display panel. The liquid crystal display panel and the substrate each have a shape in which a common width in a first direction is longer than a width in a second direction, which is orthogonal to the first direction. The width of the substrate in the second direction is shorter than the width of the liquid crystal display panel in the second direction. The substrate is opposed to, while avoiding being opposed to both end portions of the liquid crystal display panel in the second direction, a central portion between the both end portions of the liquid crystal display panel.
    Type: Application
    Filed: July 24, 2014
    Publication date: November 20, 2014
    Inventors: Sachiko Yamazaki, Ikuko Imajo, Masashi Baba, Kikuo Ono
  • Publication number: 20140313424
    Abstract: A liquid crystal display device includes: a liquid crystal panel; a reflection sheet arranged on a rear surface side of the liquid crystal panel, the reflection sheet being curved so that a surface facing the liquid crystal panel is recessed; and a light emitting diode substrate including: a light emitting diode array in which a plurality of light emitting diodes are arranged along a longitudinal direction; and electrodes connected to the plurality of light emitting diodes. In a circle which is centered at one light emitting diode and whose diameter is a distance from the one light emitting diode to another light emitting diode adjacent to the one light emitting diode, an area of the electrode connected to a high temperature side electrode of the one light emitting diode is larger than an area of the electrode connected to a low temperature side electrode of the one light emitting diode.
    Type: Application
    Filed: February 28, 2014
    Publication date: October 23, 2014
    Applicant: Panasonic Liquid Crystal Display Co., Ltd.
    Inventor: Ikuko IMAJO
  • Patent number: 8804066
    Abstract: A backlight unit has a light source area. The width of the light source area in a first direction is shorter than the width of a liquid crystal panel in the first direction. A plurality of LED modules (31) are arranged along the second direction perpendicular to the first direction. End lenses (41A, 41B) and a middle lens (42) for enlarging a light divergence angle are disposed on the plurality of LED modules (31). The direction in which the end lens (41A, 41B) enlarges the light divergence angle differs from that in which the middle lens (42) enlarges the divergence angle. This structure can reduce difference in brightness of the liquid crystal panel, while reducing the number of light sources.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: August 12, 2014
    Assignee: Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Ikuko Imajo, Sachiko Yamazaki, Kikuo Ono
  • Patent number: 8803169
    Abstract: A liquid crystal display device includes a liquid crystal display panel, and a backlight unit. The backlight unit includes a plurality of light emitting diodes each having an anode and a cathode, and first adjacently and disposed substrates. The plurality of light emitting diodes are mounted on the first substrate and the second substrate and arranged in a plurality of rows. A first light emitting diode mounted on the first substrate and a second light emitting diode mounted on the second substrate which are adjacent across a boundary between the first substrate and the second substrate are disposed so that respective anodes of the first and second light emitting diodes are opposed to each other and have a pitch equal to or smaller than a pitch of other light emitting diodes mounted on the first and second substrates.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: August 12, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Co., Ltd.
    Inventors: Masashi Baba, Ikuko Imajo, Isao Matsuda
  • Patent number: 8804068
    Abstract: In order to fix lenses of light emitting diodes stably without impairing heat dissipation performance in a liquid crystal display device, the liquid crystal display device includes: a liquid crystal panel; and a light emitting diode substrate (7), which is disposed on a rear surface side of the liquid crystal panel and includes: a plurality of light emitting diode elements (22) disposed along a longitudinal direction; lenses (20) each including a plurality of legs (21), the lenses being disposed on the liquid crystal panel side of the light emitting diode elements (22); and electrodes (23) which are formed on a surface of the light emitting diode substrate (7) and are electrically connected to the light emitting diode elements (22), and all the legs (21) for fixing the lenses (20) to the light emitting diode substrate (7) are disposed directly above the electrodes (23).
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: August 12, 2014
    Assignee: Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masashi Baba, Ikuko Imajo
  • Patent number: 8804071
    Abstract: A light source section provided in a backlight unit has a smaller width in a direction perpendicular to a length direction of the light source section than a width in the same direction of the liquid crystal panel. A plurality of LED modules are arranged along the length direction of the light source section. The LED modules are respectively assigned to areas of the liquid crystal panel, which are extended in the width direction of the light source section. Lenses are respectively disposed over the LED modules and expand light toward the areas. A control device controls each of the plurality of light sources separately or each of groups into which the plurality of light sources are divided, separately. Accordingly, it is possible to improve a contrast of a display screen, while reducing the number of light sources.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: August 12, 2014
    Assignee: Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kikuo Ono, Ikuko Imajo, Yoshinori Ohshima
  • Publication number: 20140085566
    Abstract: A liquid crystal display device includes a liquid crystal display panel, and a backlight unit. The backlight unit includes a plurality of light emitting diodes each having an anode and a cathode, and first adjacently and disposed substrates. The plurality of light emitting diodes are mounted on the first substrate and the second substrate and arranged in a plurality of rows. A first light emitting diode mounted on the first substrate and a second light emitting diode mounted on the second substrate which are adjacent across a boundary between the first substrate and the second substrate are disposed so that respective anodes of the first and second light emitting diodes are opposed to each other and have a pitch equal to or smaller than a pitch of other light emitting diodes mounted on the first and second substrates.
    Type: Application
    Filed: November 27, 2013
    Publication date: March 27, 2014
    Applicants: Panasonic Liquid Crystal Display Co., Ltd., Japan Display Inc.
    Inventors: Masashi Baba, Ikuko Imajo, Isao Matsuda
  • Patent number: 8598603
    Abstract: Provided is a liquid crystal display device, including: a liquid crystal display panel; and a backlight unit, in which: the backlight unit includes: a plurality of light emitting diodes each having an anode and a cathode; a first substrate; and a second substrate, the plurality of light emitting diodes being mounted on the first substrate and the second substrate; the first substrate and the second substrate are disposed adjacent to each other; light emitting diodes which are adjacent across a boundary between the first substrate and the second substrate are disposed so that the respective anodes are opposed to each other and so as to have a pitch equal to or smaller than a pitch of other adjacent light emitting diodes.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: December 3, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Display Co., Ltd.
    Inventors: Masashi Baba, Ikuko Imajo, Isao Matsuda
  • Patent number: 8534859
    Abstract: Provided is a liquid crystal display device, including: a liquid crystal panel having a display region; and a backlight unit disposed below the liquid crystal panel, in which: the backlight unit includes: at least one mounting substrate on which light emitting diodes are mounted; a radiator plate; and a reflection member; the reflection member has a reflection surface which is formed to have a recess surface shape; the light emitting diodes on the at least one mounting substrate are disposed on a bottom portion of the reflection surface; the at least one mounting substrate is disposed at a position under the bottom portion; the radiator plate is disposed under the at least one mounting substrate; and the radiator plate has, in plan view, a larger area than the at least one mounting substrate and a smaller area than the display region.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: September 17, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Ikuko Imajo, Masashi Baba, Sachiko Yamazaki
  • Patent number: 8485678
    Abstract: Provided is a liquid crystal display device, including: a liquid crystal panel having a display region; and a backlight unit disposed below the liquid crystal panel, in which: the backlight unit includes: at least one mounting substrate on which light emitting diodes are mounted; a radiator plate; and a reflection member; the reflection member has a reflection surface which is formed to have a recess surface shape; the light emitting diodes on the at least one mounting substrate are disposed on a bottom portion of the reflection surface; the at least one mounting substrate is disposed at a position under the bottom portion; the radiator plate is disposed under the at least one mounting substrate; and the radiator plate has, in plan view, a larger area than the at least one mounting substrate and a smaller area than the display region.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: July 16, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Ikuko Imajo, Masashi Baba, Sachiko Yamazaki
  • Patent number: 8358386
    Abstract: In a liquid crystal display device including a liquid crystal display panel, and a backlight disposed on the rear surface of the liquid crystal display panel, the backlight is provided with a plurality of white light-emitting diodes arranged in a plane opposing the liquid crystal display panel. Based on a chromaticity coordinate value representing a color of emission identified for each of the white light-emitting diodes, the white light-emitting diodes are selectively combined for arrangement in proximity in such a manner that the color of emission as a result of averaging over the white light-emitting diodes (1a, 1b) to be arranged in proximity takes a predetermined value of chromaticity coordinates.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: January 22, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Ikuko Imajo, Ryutaro Oke, Sachiko Yamazaki, Masashi Baba
  • Publication number: 20120274871
    Abstract: In a liquid crystal display device including a backlight unit that irradiates the entire image formation region with light from light emitting diodes disposed in a concentrated manner, in order to reduce warpage of a reflection sheet to obtain uniform illumination, provided is a liquid crystal display device (1), including: a liquid crystal panel (3); a reflection sheet (6), which is disposed on a rear surface side of the liquid crystal panel (3) and is curved so as to have a concave surface facing the liquid crystal panel (3); a light emitting diode substrate on which a plurality of light emitting diodes (14) are disposed along a horizontal direction; and a support (21) for fixing the reflection sheet (6) at a curved portion of the reflection sheet (6).
    Type: Application
    Filed: April 25, 2012
    Publication date: November 1, 2012
    Applicant: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventors: Sachiko YAMAZAKI, Ikuko IMAJO, Masashi BABA