Patents by Inventor Takao Imaoku

Takao Imaoku 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
  • Patent number: 10401693
    Abstract: A liquid crystal module which is disposed opposite a backlight includes: a first liquid crystal panel which includes a pair of first transparent substrates; a second liquid crystal panel which is disposed between the backlight and the first liquid crystal panel and includes a pair of second transparent substrates; and a diffuser sheet disposed therebetween. A first transparent substrate that is closer to the diffuser sheet among the pair of first transparent substrates is thinner than a second transparent substrate that is closer to the diffuser sheet among the pair of second transparent substrates.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: September 3, 2019
    Assignee: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventors: Katsuhiro Kikuchi, Kazuhiko Tsuda, Takao Imaoku, Yoichi Yasui
  • Publication number: 20190258101
    Abstract: A liquid crystal display device includes: a first liquid crystal cell; a second liquid crystal cell disposed in a backlight side; and a first optical sheet and a second optical sheet both having an identical layer structure. The first optical sheet is disposed on a front surface side of the first liquid crystal cell and the second optical sheet is disposed on a back surface side of the second liquid crystal cell, or vice versa.
    Type: Application
    Filed: May 2, 2019
    Publication date: August 22, 2019
    Inventors: Yoichi YASUI, Takao IMAOKU, Katsuhiro KIKUCHI, Kazuhiko TSUDA
  • Patent number: 10353237
    Abstract: A lighting device includes LEDs 17, and a light guide plate 19 including an edge surface and a pair of plate surfaces, a part of the edge surface being a light entrance surface 19B through which light from the LEDs 17 enters, and one of the plate surfaces being a light exit surface 19A through which the light exits and another one of the plate surfaces being an opposite plate surface 19C opposite from the light exit surface 19A. The light guide plate 19 includes prism portions 51 on the opposite plate surface 19C, projecting from the opposite plate surface 19C and arranged in the X-axis direction and configured to collect light toward in a normal direction of the light exit surface 19A, and an exit light reflection portion 60 provided in a recessed portion 52 that is formed by two adjacent prism portions 51 and configured to reflect light travelling within the light guide plate 19 and facilitate exiting of light from the light guide plate 19.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: July 16, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yoshinobu Hirayama, Takao Imaoku, Shugo Yagi
  • Patent number: 10310164
    Abstract: A lighting device includes a light guide plate, a plurality of LEDs positioned to project light into a first side surface of the light guide plate, a reflection sheet facing a bottom surface of the light guide plate, a plurality of reflective elements on a light exit surface of the light guide plate opposite the bottom surface and extending in a direction parallel to the first side surface, and a plurality of convex elements on the bottom surface of the light guide plate. The density of the convex elements increases with increasing distance from the light source.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: June 4, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yoshinobu Hirayama, Takao Imaoku, Shugo Yagi
  • 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: 10180527
    Abstract: A backlight unit includes a light emission reflecting portion, first reflecting protrusions, and second reflecting protrusions. The light emission reflecting portion includes unit reflecting portions that include main reflecting surfaces and light reentering surfaces arranged opposite to the main reflecting surfaces, respectively. The first reflecting protrusions include extended main reflecting surfaces that continue to the main reflecting surfaces, respectively, and first auxiliary reflecting surfaces that reflect rays of light traveling toward an opposite plate surface and direct the rays of light toward the main reflecting surfaces and the extended main reflecting surfaces.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: January 15, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Ryuzo Yuki, Takeshi Ishida, Takao Imaoku, Yoshinobu Hirayama, Shugo Yagi
  • Patent number: 9971081
    Abstract: A backlight unit includes LEDs, a light guide plate, a prism sheet, exiting light reflecting portions, prisms, concave lenticular lenses, and flat portions. The concave lenticular lenses are configured such that an occupancy rate of concave cylindrical lenses with respect to the second direction is higher in an area closer to a light entering surface with respect to the first direction and the occupancy rate is lower in an area farther from the light entering surface. The flat portions are formed adjacent to the concave cylindrical lenses with respect to the second direction such that an occupancy rate of flat portions with respect to the second direction is lower in an area closer to a light entering surface with respect to the first direction and the occupancy rate of the flat portions with respect to the second direction is higher in an area farther from the light entering surface.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: May 15, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yoshinobu Hirayama, Takao Imaoku, Takeshi Ishida, Ryuzo Yuki, Shugo Yagi
  • Patent number: 9915770
    Abstract: A backlight unit includes LEDs, a light guide plate, a prism sheet, exiting light reflecting portions, prisms, concave lenticular lens lenses, and flat portions. The concave lenticular lenses are configured such that an occupancy rate of concave cylindrical lenses with respect to the second direction is higher in an area closer to a light entering surface with respect to the first direction and the occupancy rate is lower in an area farther from the light entering surface. The flat portions are formed adjacent to the concave cylindrical lenses with respect to the second direction such that an occupancy rate of flat portions with respect to the second direction is lower in an area closer to a light entering surface with respect to the first direction and the occupancy rate of the flat portions with respect to the second direction is higher in an area farther from the light entering surface.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: March 13, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshinobu Hirayama, Takao Imaoku, Takeshi Ishida, Ryuzo Yuki, Shugo Yagi
  • Publication number: 20180031897
    Abstract: A liquid crystal module which is disposed opposite a backlight includes: a first liquid crystal panel which includes a pair of first transparent substrates; a second liquid crystal panel which is disposed between the backlight and the first liquid crystal panel and includes a pair of second transparent substrates; and a diffuser sheet disposed therebetween. A first transparent substrate that is closer to the diffuser sheet among the pair of first transparent substrates is thinner than a second transparent substrate that is closer to the diffuser sheet among the pair of second transparent substrates.
    Type: Application
    Filed: March 29, 2017
    Publication date: February 1, 2018
    Inventors: Katsuhiro KIKUCHI, Kazuhiko TSUDA, Takao IMAOKU, Yoichi YASUI
  • Publication number: 20170363909
    Abstract: A lighting device includes LEDs 17, and a light guide plate 19 including an edge surface and a pair of plate surfaces, a part of the edge surface being a light entrance surface 19B through which light from the LEDs 17 enters, and one of the plate surfaces being a light exit surface 19A through which the light exits and another one of the plate surfaces being an opposite plate surface 19C opposite from the light exit surface 19A. The light guide plate 19 includes prism portions 51 on the opposite plate surface 19C, projecting from the opposite plate surface 19C and arranged in the X-axis direction and configured to collect light toward in a normal direction of the light exit surface 19A, and an exit light reflection portion 60 provided in a recessed portion 52 that is formed by two adjacent prism portions 51 and configured to reflect light travelling within the light guide plate 19 and facilitate exiting of light from the light guide plate 19.
    Type: Application
    Filed: December 3, 2015
    Publication date: December 21, 2017
    Inventors: YOSHINOBU HIRAYAMA, TAKAO IMAOKU, SHUGO YAGI
  • Publication number: 20170363798
    Abstract: A lighting device includes LEDs 17, a light guide plate 19, a reflection sheet 40, an exit light reflection portion 41 on a light exit surface 19a side of the light guide plate 19, opposite plate surface-side convex lenticular lens portions 44 and the flat portions 45 on the opposite plate surface 19c of the light guide plate 19. The occupied ratio of the opposite plate surface-side convex lenticular lens portions 44 with respect to the second direction is relatively low in a portion near the light entrance surface 19b in the first direction and is relatively high in a portion far away from the light entrance surface. The flat portions 45 have a relatively high occupied ratio to the opposite plate surface 19c with respect to the second direction in a portion near the light entrance surface 19b in the first direction and have a relatively low occupied ratio in a portion far away from the light entrance surface 19b.
    Type: Application
    Filed: December 3, 2015
    Publication date: December 21, 2017
    Inventors: YOSHINOBU HIRAYAMA, TAKAO IMAOKU, SHUGO YAGI
  • Publication number: 20170351142
    Abstract: A liquid crystal display device includes a light source, a light guide plate, a backlight unit, and a complex polarizing plate. The light guide plate includes light collecting portions to collect light rays exiting through a light exiting surface with respect to a direction perpendicular to an optical axis of the light source to direct the light rays in a frontward direction. The backlight unit includes an optical sheet to collect the light rays to direct the light rays in the frontward direction. The complex polarizing plate includes a selective reflecting sheet and a polarizing plate. The selective reflecting sheet includes a first transmission axis and a reflection axis perpendicular to the first transmission axis. The polarizing plate includes a second transmission axis. The complex polarizing plate is laid on the backlight unit with the first transmission axis and the second transmission axis perpendicular to the light collecting direction.
    Type: Application
    Filed: December 17, 2015
    Publication date: December 7, 2017
    Inventors: TAKAO IMAOKU, YOSHINOBU HIRAYAMA, SHUGO YAGI
  • Publication number: 20170329180
    Abstract: A lighting device includes LEDs 17, a light guide plate 19 including an edge surface and a pair of plate surfaces, a light reflection sheet 40, and a wavelength conversion sheet 50. A part of the edge surface is a light entrance surface 19B through which light from the LEDs 17 enters, and the pair of plate surfaces are light exit surfaces 19A, 19C through which the light exits. The light guide plate 19 includes second prism portions 65 formed on the light exit surface 19A and configured to collect light in a direction of a normal line of the light exit surface 19A. The light reflection sheet 40 is disposed to cover the light exit surface 19C reflects the light in a direction toward the light guide plate 19. The wavelength conversion sheet 50 is disposed between the light guide plate 19 and the light reflection sheet 40 and converts a wavelength of light transmitting therethrough.
    Type: Application
    Filed: November 26, 2015
    Publication date: November 16, 2017
    Inventors: YOSHINOBU HIRAYAMA, TAKAO IMAOKU, SHUGO YAGI
  • Publication number: 20170269285
    Abstract: A backlight device includes: LEDs; a light guide plate that has a light-receiving face, a light-exiting surface, and an opposite surface; a reflective sheet disposed so as to face the opposite surface of the light guide plate; and an exiting-light reflecting part that facilitates the emission of light from the light-exiting surface by reflecting light that propagates within the light guide plate, and that is disposed on the light-exiting surface side of the light guide plate. The exiting-light reflecting part is formed of a reflective unit disposed in plurality with gaps therebetween along a first direction, which is along a pair of end faces that are among the peripheral end faces of the light guide plate, are on opposite sides of the light guide plate, and do not include the light-receiving face. The reflective unit extends along a second direction, which is along a pair of end faces that are among the peripheral end faces of the light guide plate and that include the light-receiving face.
    Type: Application
    Filed: July 22, 2015
    Publication date: September 21, 2017
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Yoshinobu HIRAYAMA, Takao IMAOKU, Takeshi ISHIDA, Ryuzo YUKI, Shugo YAGI
  • Patent number: 9728148
    Abstract: The color-field sequential liquid crystal display apparatus includes a liquid-crystal state value acquirer that acquires a liquid-crystal state value (a gradation value corresponding to the state of orientation of liquid crystal molecules) at the end of a displayed field on the basis of an input gradation value of the displayed field and the liquid-crystal state value at the end of a previous field (the first previous field of the displayed field) and an applied gradation value determiner that determines an applied gradation value of the displayed field by compensating the input gradation value of the displayed field on the basis of the liquid-crystal state value at the end of the previous field. The applied gradation value determiner determines the applied gradation value so that a display luminance in each field is a display luminance corresponding to the input gradation value.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: August 8, 2017
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Hidekazu Miyata, Takao Imaoku
  • Publication number: 20170205558
    Abstract: A backlight unit includes LEDs, a light guide plate, a prism sheet, exiting light reflecting portions, prisms, concave lenticular lens lenses, and flat portions. The concave lenticular lenses are configured such that an occupancy rate of concave cylindrical lenses with respect to the second direction is higher in an area closer to a light entering surface with respect to the first direction and the occupancy rate is lower in an area farther from the light entering surface. The flat portions are formed adjacent to the concave cylindrical lenses with respect to the second direction such that an occupancy rate of flat portions with respect to the second direction is lower in an area closer to a light entering surface with respect to the first direction and the occupancy rate of the flat portions with respect to the second direction is higher in an area farther from the light entering surface.
    Type: Application
    Filed: July 22, 2015
    Publication date: July 20, 2017
    Inventors: Yoshinobu HIRAYAMA, Takao IMAOKU, Takeshi ISHIDA, Ryuzo YUKI, Shugo YAGI
  • Patent number: 9653037
    Abstract: An optical device (100) includes a first substrate (10) and a second substrate (20), and an optical layer (30) interposed therebetween. The first substrate includes a first electrode (11) and a second electrode (12), and the second substrate includes a third electrode (21). The optical layer contains a medium (31) and anisotropically-shaped particles (32) whose alignment direction changes in accordance with the direction of an electric field applied to the optical layer. The first electrode and the second electrode, which are interdigitated electrodes, are disposed so that their respective branches (11a, 12a) mesh with one another via a predetermined interspace. The relationships w1<l, w2<l and g?l?w1+w2+g are satisfied, where w1 is the width of each branch of the first electrode, w2 is the width of each branch of the second electrode, g is the predetermined interspace, and l is the length of the anisotropically-shaped particles.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: May 16, 2017
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takao Imaoku, Iori Aoyama, Tsuyoshi Inoue, Hiroyuki Moriwaki, Eiji Satoh
  • Publication number: 20170038515
    Abstract: A backlight unit includes a light emission reflecting portion, first reflecting protrusions, and second reflecting protrusions. The light emission reflecting portion includes unit reflecting portions that include main reflecting surfaces and light reentering surfaces arranged opposite to the main reflecting surfaces, respectively. The first reflecting protrusions include extended main reflecting surfaces that continue to the main reflecting surfaces, respectively, and first auxiliary reflecting surfaces that reflect rays of light traveling toward an opposite plate surface and direct the rays of light toward the main reflecting surfaces and the extended main reflecting surfaces.
    Type: Application
    Filed: February 19, 2015
    Publication date: February 9, 2017
    Inventors: Ryuzo YUKI, Takeshi ISHIDA, Takao IMAOKU, Yoshinobu HIRAYAMA, Shugo YAGI