Patents by Inventor Osamu Itou

Osamu Itou 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).

  • Publication number: 20210098665
    Abstract: According to an aspect, a display device includes: a substrate; a plurality of pixels provided to the substrate; a plurality of light emitting elements provided to the pixels; and a first light diffusion layer including a plurality of light diffusion structures and having a first surface and a second surface opposite to the first surface, the second surface facing the substrate with the light emitting elements interposed between the second surface and the substrate. The light diffusion structures each include a plurality of high refractive index layers and a plurality of low refractive index layers. The high refractive index layers and the low refractive index layers are alternately layered in a thickness direction of the first light diffusion layer. The high refractive index layers and the low refractive index layers are each curved and recessed in a direction from the first surface toward the second surface.
    Type: Application
    Filed: September 28, 2020
    Publication date: April 1, 2021
    Inventor: Osamu ITOU
  • Publication number: 20210082994
    Abstract: According to an aspect, a display device includes: a substrate; a plurality of pixels; a first anisotropic diffusion layer and a second anisotropic diffusion layer that are layered; and a plurality of light emitting elements interposed between the first anisotropic diffusion layer and the substrate. The first anisotropic diffusion layer and the second anisotropic diffusion layer each include a high refractive index region and a low refractive index region in a mixed manner. An absolute value of a first angle formed by a boundary between the high refractive index region and the low refractive index region of the first anisotropic diffusion layer and a direction perpendicular to the substrate is different from an absolute value of a second angle formed by a boundary between the high refractive index region and the low refractive index region of the second anisotropic diffusion layer and the direction perpendicular to the substrate.
    Type: Application
    Filed: September 11, 2020
    Publication date: March 18, 2021
    Inventor: Osamu ITOU
  • Publication number: 20200387038
    Abstract: According to one embodiment, an array substrate includes a semiconductor layer, scanning and signal lines, first and second insulating layers, a pedestal and a pixel electrode. The scanning line is opposed to the semiconductor layer. The first insulating layer is provided above the semiconductor layer. The signal line and the pedestal are connected to the semiconductor layer through first and second contact holes in the first insulating layer. The second insulating layer is provided above the pedestal. The pixel electrode is connected to the pedestal through a third contact hole in the second insulating layer. The signal line and the pedestal are provided in layers different from each other.
    Type: Application
    Filed: August 26, 2020
    Publication date: December 10, 2020
    Applicant: Japan Display Inc.
    Inventor: Osamu ITOU
  • Patent number: 10690972
    Abstract: The purpose of the invention is to avoid the domain in high definition liquid crystal display devices. The representative structure is as follows. Scan lines extending in a first direction, video signal lines extending in a second direction, a pixel is formed in an area surrounded by the video signal lines and the scan lines, the pixel includes: a thin film transistor, a flattening film that covers the thin film transistor, a first electrode formed on the flattening film, a second electrode formed over the first electrode via an insulating film, and a contact hole that is formed in the flattening film to connect the first electrode and the thin film transistor; the second electrode is formed in common in plural pixels, and has a slit between the video signal lines; wherein the slit is formed continuously in a plurality of pixels arranged in the second direction.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: June 23, 2020
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Toshimasa Ishigaki
  • Patent number: 10527897
    Abstract: According to one embodiment, a display device includes an insulating substrate, a light-shielding member disposed above the insulating substrate, a first color filter disposed above the insulating substrate, a second color filter disposed alongside the first color filter, a partition disposed on the light-shielding member and between the first color filter and the second color filter and an insulating film disposed on the first color filter and the second color filter, and an upper surface of the partition and an upper surface of the insulating film are located on a same plane.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: January 7, 2020
    Assignee: Japan Display Inc.
    Inventors: Toshimasa Ishigaki, Osamu Itou
  • Patent number: 10409124
    Abstract: According to one embodiment, a liquid crystal display device, includes a first substrate including a scanning signal line, a video signal line, a first electrode, a color filter, a common line in contact with the first electrode along the video signal line, an antireflection layer located on the common line, a transparent layer located on the antireflection layer, and a second electrode, a liquid crystal layer located on the first substrate, and a second substrate located on the liquid crystal layer, the transparent layer having a thickness of 10 nm or more and 40 nm or less.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: September 10, 2019
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Daisuke Sonoda, Masahiro Kosuge
  • Patent number: 10310339
    Abstract: In a wall electrode liquid crystal display device, planar distribution of the wall structure and the electrode is optimized to improve a yield. A liquid crystal display device includes a plurality of pixels arranged in a matrix, each of the pixels having an insulator wall structure formed at a border of pixels, a wall electrode formed at a side surface of the wall structure of the border of the pixels, a source electrode which is continuous with the wall electrode and formed of a planar electrode extending in a planar direction, a first common electrode provided between source electrodes at both sides of the pixel to form a retentive capacitance, and a second common electrode provided between wall electrodes on both sides of the pixel. A slit which becomes a border of the wall electrodes of two adjacent pixels is disposed only on a top of the wall structure.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: June 4, 2019
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Takato Hiratsuka, Masanao Yamamoto, Toshimasa Ishigaki, Daisuke Sonoda
  • Publication number: 20180356693
    Abstract: The purpose of the invention is to realize a liquid crystal display device of high definition and high response speed. The representative structure is: a liquid crystal display device comprising: a first substrate and a second substrate, which sandwiches a liquid crystal layer; the pixel includes: a thin film transistor, a first electrode, a second electrode formed over the first electrode sandwiching an insulating film, a contact hole that connects the second electrode and the thin film transistor, the second electrode has a first portion that extends in the second direction, and a second portion that is wider in the first direction than the first portion, a first projection extending in the second direction over the video signal line, and a second projection, which is wider than the first projection in the first direction, at the position aligned with the second portion in the first direction are formed.
    Type: Application
    Filed: June 1, 2018
    Publication date: December 13, 2018
    Applicant: Japan Display Inc.
    Inventor: Osamu ITOU
  • Publication number: 20180314118
    Abstract: The purpose of the invention is to avoid the domain in high definition liquid crystal display devices. The representative structure is as follows. Scan lines extending in a first direction, video signal lines extending in a second direction, a pixel is formed in an area surrounded by the video signal lines and the scan lines, the pixel includes: a thin film transistor, a flattening film that covers the thin film transistor, a first electrode formed on the flattening film, a second electrode formed over the first electrode via an insulating film, and a contact hole that is formed in the flattening film to connect the first electrode and the thin film transistor; the second electrode is formed in common in plural pixels, and has a slit between the video signal lines; wherein the slit is formed continuously in a plurality of pixels arranged in the second direction.
    Type: Application
    Filed: March 22, 2018
    Publication date: November 1, 2018
    Applicant: Japan Display Inc.
    Inventors: Osamu Itou, Toshimasa Ishigaki
  • Patent number: 10108056
    Abstract: A pixel electrode is configured of one comb tooth portion and a contact portion whose width is widened from the end portion of the comb tooth portion in a first direction that is the extending direction of a scanning line. The width of the contact portion is not expanded in a direction opposite to the first direction, and the production of a domain is prevented. A picture signal line is bent in the direction in which the width of the contact portion of the pixel electrode is widened, so that the comb tooth portion of the pixel electrode can be disposed in the center between the picture signal lines, and the width of the contact portion can be formed in a sufficient width in the direction in which the picture signal line is bent. Thus, the contact margin of the pixel electrode can be provided.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: October 23, 2018
    Assignee: Japan Display Inc.
    Inventors: Hidetatsu Nakamura, Osamu Itou, Takeshi Sakai
  • Patent number: 10074670
    Abstract: In an embodiment, a color filter substrate includes an substrate, first to fifth lines, first to third switching elements, first to third electrodes, color filter layer between electrodes and the substrate, and insulating layer with first to third apertures. The first electrode is formed in a first area defined by lines at the first line side, and the second electrode is formed in the first area at the second line side. The third electrode is formed in a second area defined by lines. Electrodes are connected to switching elements through apertures respectively. The first aperture is formed at the first line side, and the second aperture is formed at the second line side.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: September 11, 2018
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Kenji Nakao, Toshimasa Ishigaki, Daisuke Sonoda
  • Patent number: 10073313
    Abstract: A provided is a liquid crystal display device with a high definition screen and less color mixture. On an array substrate, a pixel is formed between the adjacent video signal lines, a color filter is formed within the pixel, a flattening film is formed on the color filter, a lower layer is formed on the flattening film, and an upper layer having a slit is formed on the lower layer with an interlayer insulating film interposed therebetween; and on the array substrate, an opposite substrate is arranged with a liquid crystal layer interposed therebetween. When a distance from the top of the video signal line working as a light shielding film to the bottom of the liquid crystal layer is defined as d and a space between the centers of the video signal lines separating the pixel is defined as w, a relation of d?0.3w is satisfied.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: September 11, 2018
    Assignee: Japan Display Inc.
    Inventors: Kenji Nakao, Osamu Itou, Toshimasa Ishigaki, Daisuke Sonoda, Takato Hiratsuka
  • Patent number: 10054832
    Abstract: Disclosed is a liquid crystal display device including an active element substrate having an active element; a first layer provided on the active element and having a first hole formed therein, the first layer being one of a first insulating layer and a color filter; a second layer provided on the first layer and having a second hole formed therein, the second layer being the other of the first insulating layer and the color filter; a common electrode provided on the second layer; a second insulating layer having a plate-like portion provided on the common electrode and a first contact portion protruded downward; and a pixel electrode having a second contact portion protruded downward. The first contact portion is provided inside the second hole, and the second contact portion is provided inside the first hole and inside the second hole and electrically connected to the active element.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: August 21, 2018
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Kenji Nakao, Toshimasa Ishigaki, Masahiro Kosuge
  • Publication number: 20180231829
    Abstract: According to one embodiment, a display device including a first substrate including a first insulating film which has a first upper surface, a first video signal line, a first barrier film which is in contact with the first upper surface, covers the first video signal line, and has a second upper surface and side surfaces, a color filter which is in contact with the first upper surface and the side surfaces and has a third upper surface, and a second insulating film which is in contact with the second upper surface and the third upper surface and has a fourth upper surface, a second substrate, the fourth upper surface just above the color filter being located at an upper position than the second upper surface.
    Type: Application
    Filed: February 14, 2018
    Publication date: August 16, 2018
    Applicant: Japan Display Inc.
    Inventor: Osamu ITOU
  • Patent number: 10001680
    Abstract: In an LCD device having wall electrodes, four kinds of pixels are used that impart different alignment properties to the liquid crystal molecules. Specifically, the LC molecules are aligned such that: the LC molecules in first pixels twist clockwise and rise in a plus direction; the LC molecules in second pixels twist clockwise and rise in a minus direction; the LC molecules in third pixels twist counterclockwise and rise in the plus direction; and the LC molecules in fourth pixels twist counterclockwise and rise in the minus direction. The pixels of the same type are arranged in rows such that their long sides are adjacent to one another.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: June 19, 2018
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Takato Hiratsuka, Toshimasa Ishigaki, Daisuke Sonoda
  • Patent number: 9964816
    Abstract: A liquid crystal display device includes a TFT substrate, a CF substrate, and a liquid crystal interposed between the TFT substrate and the CF substrate, and drives the liquid crystal in a horizontal electric field. The TFT substrate includes a recess, and the CF substrate includes a columnar protrusion. The protrusion of the CF substrate is fitted to the recess of the TFT substrate so as to function as a stopper for preventing a positional gap between the TFT substrate and the CF substrate.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: May 8, 2018
    Assignee: Japan Display Inc.
    Inventors: Yasushi Tomioka, Takato Hiratsuka, Osamu Itou
  • Patent number: 9958719
    Abstract: According to one embodiment, a display device includes an insulating substrate, a first insulating film, a second insulating film, a third insulating film, a fourth insulating film, a fifth insulating film, a sixth insulating film, a color filter layer, a semiconductor layer disposed between the second insulating film and the third insulating film, and a gate electrode disposed between the third insulating film and the fourth insulating film, wherein the first, fourth, and sixth insulating films are formed of a silicon nitride, and the second, third, and fifth insulating films are formed of a silicon oxide.
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: May 1, 2018
    Assignee: Japan Display Inc.
    Inventors: Yuki Matsuura, Osamu Itou
  • Publication number: 20180107078
    Abstract: According to one embodiment, a display device includes an insulating substrate, a light-shielding member disposed above the insulating substrate, a first color filter disposed above the insulating substrate, a second color filter disposed alongside the first color filter, a partition disposed on the light-shielding member and between the first color filter and the second color filter and an insulating film disposed on the first color filter and the second color filter, and an upper surface of the partition and an upper surface of the insulating film are located on a same plane.
    Type: Application
    Filed: October 16, 2017
    Publication date: April 19, 2018
    Applicant: Japan Display Inc.
    Inventors: Toshimasa ISHIGAKI, Osamu Itou
  • Patent number: 9933558
    Abstract: According to one embodiment, an illumination device includes a lightguide, a light-emitting layer, a first reflector, a second reflector, and a third reflector. A distance between the first reflector and the second reflector is greater at a second position farther from the light-emitting layer than at a first position closer to the light-emitting layer. A distance between the lightguide and the third reflector is greater at a fourth position farther from the first reflector than at a third position closer to the first reflector. An emission portion for allowing emission of light emitted from the light-emitting layer is formed between the second reflector and the third reflector.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: April 3, 2018
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Eri Sasaki
  • Patent number: 9927644
    Abstract: There is provided a high-definition liquid crystal display device that can prevent flicker due to a reduction in the pixel potential in a low-frequency drive of about 10 Hz to reduce power consumption. The pixel has a TFT formed of Poly-Si as a switching element. In the pixel, a capacitance insulating film is formed on a planar first electrode on which a comb-shaped second electrode is fanned. When the film thickness of the insulating film is d and the dielectric constant at 10 Hz frequency is ?, it is given that ?d?5×10?6 m at 10 Hz frequency. The capacitance insulating film does not have a hysteresis characteristic. The refractive index of the capacitance insulating film with respect to a light of a wavelength of 632.8 nm is 1.7 to 2.0.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: March 27, 2018
    Assignee: Japan Display Inc.
    Inventors: Toshiki Kaneko, Takashi Nakamura, Masahiro Tada, Yukio Tanaka, Hiroyuki Kimura, Osamu Itou