Patents by Inventor Yuichi Minoura

Yuichi Minoura 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: 20210103083
    Abstract: The present invention provides a method for producing a retardation film excellent in retardation controllability against heat and the retardation film. The method for producing a retardation film includes, in the following order: fixing an alignment of liquid crystal compounds to form a retardation giving layer, and heating the retardation giving layer. Preferably, the heating is first heating and the method further includes second heating for heating the retardation giving layer after the first heating.
    Type: Application
    Filed: July 18, 2017
    Publication date: April 8, 2021
    Inventors: KOJI MURATA, AKIRA SAKAI, YUICHI KAWAHIRA, MASAHIRO HASEGAWA, TAKAKO KOIDE, KOZO NAKAMURA, KIYOSHI MINOURA
  • Patent number: 10964805
    Abstract: A compound semiconductor device includes a compound semiconductor laminate structure including an electron transit layer and an electron supply layer, a gate electrode, a source electrode, and a drain electrode that are formed over the electron supply layer, a first insulating layer of diamond formed between the gate electrode and the drain electrode over the compound semiconductor laminate structure, and a second insulating layer formed between the gate electrode and the source electrode over the compound semiconductor laminate structure, wherein a positive compressive stress is applied from the first insulating layer to the electron supply layer, and a compressive stress from the second insulating layer to the electron supply layer is smaller than the compressive stress from the first insulating layer to the electron supply layer.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: March 30, 2021
    Assignee: FUJITSU LIMITED
    Inventors: Shirou Ozaki, Kozo Makiyama, Yuichi Minoura, Yusuke Kumazaki, Toshihiro Ohki, Naoya Okamoto
  • Patent number: 10962839
    Abstract: The liquid crystal display panel includes in the following order from a viewing surface side to a back surface side: a first polarizer; a first ?/4 retardation layer; a first substrate; a second ?/4 retardation layer; a liquid crystal layer; a second substrate; and a second polarizer, the liquid crystal display panel being in a transverse electric field mode, the first substrate including a color filter layer in a display region, the second ?/4 retardation layer being a single layer covering the color filter layer and including a first retardation portion in an end region of the display region and a second retardation portion in a central region of the display region, the first retardation portion having a greater thickness than the second retardation portion, and the first retardation portion and the second retardation portion differing from each other in in-plane retardation by 10 nm or less.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: March 30, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yuichi Kawahira, Kiyoshi Minoura, Akira Sakai, Takako Koide, Masahiro Hasegawa, Koji Murata
  • Patent number: 10948778
    Abstract: A liquid crystal display panel of the present invention includes, sequentially from the viewer side: a first linearly polarizing plate; a first ?/4-wavelength layer; a first substrate including a color filter, a black matrix, and a second ?/4-wavelength layer; a liquid crystal layer; a second substrate; and a second linearly polarizing plate, the liquid crystal display panel further including a sealing material disposed so as to surround the liquid crystal layer in a plan view, wherein the second ?/4-wavelength layer is disposed closer to the liquid crystal layer than the color filter and the black matrix are and such that an outer edge of the second ?/4-wavelength layer lies inside an arrangement region of the sealing material, and the first ?/4-wavelength layer and the second ?/4-wavelength layer are disposed such that their slow axes are perpendicular to each other.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: March 16, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Masahiro Hasegawa, Koji Murata, Yuichi Kawahira, Takako Koide, Kozo Nakamura, Akira Sakai, Kiyoshi Minoura
  • Patent number: 10928670
    Abstract: A liquid crystal display device includes a liquid crystal panel and a circularly polarizing plate disposed on a viewing side of the liquid crystal panel. The circularly polarizing plate sequentially includes, from a viewing side, a linearly polarizing plate and an out-cell retarder. The liquid crystal panel includes a thin-film transistor substrate, a color filter substrate facing the thin-film transistor substrate and including black matrix, a horizontal alignment liquid crystal layer disposed between the thin-film transistor substrate and the color filter substrate, and an in-cell retarder disposed in one substrate disposed on the viewing side selected from the thin-film transistor substrate and the color filter substrate. The in-cell retarder is disposed outside a region between the black matrix and the horizontal alignment liquid crystal layer.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: February 23, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yuichi Kawahira, Takako Koide, Akira Sakai, Kiyoshi Minoura
  • Patent number: 10890805
    Abstract: A liquid crystal display device includes sequentially from a viewing surface side: a first polarizer; an out-cell retardation layer; a first substrate; an in-cell retardation layer; a horizontally aligned liquid crystal layer; a second substrate; and a second polarizer. The liquid crystal display device includes a viewing angle compensation film between the first polarizer and the out-cell retardation layer or between the second substrate and the second polarizer. The out-cell retardation layer is a laminate including sequentially from a viewing surface side: a first retardation layer having an NZ coefficient of 1.0-1.1 and an Re of 120 nm or greater and smaller than 137.5 nm; and a second retardation layer having an Re of 0-10 nm and an Rth of 80-150 nm. The in-cell retardation layer is a third retardation layer having an NZ coefficient of 0.7-1.4 and an Re of 120 nm or greater and smaller than 137.5 nm.
    Type: Grant
    Filed: December 5, 2019
    Date of Patent: January 12, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Masahiro Hasegawa, Akira Sakai, Takako Koide, Yuichi Kawahira, Koji Murata, Kiyoshi Minoura
  • Patent number: 10802187
    Abstract: A circularly polarizing plate includes: a first retardation layer having negative refractive index anisotropy; a second retardation layer having positive refractive index anisotropy; and a linear polarizer, the first retardation layer and the second retardation layer being disposed such that their optical axes are parallel to each other, the first retardation layer providing an in-plane retardation whose absolute value is |R1(?)| to light having a wavelength of ? nm, the second retardation layer providing an in-plane retardation whose absolute value is |R2(?)| to light having a wavelength of ? nm, the first retardation layer and the second retardation layer satisfying the following formulas (1) to (4): |R1(450)|>|R1(550)|>|R1(650)|??(1) |R2(550)|>|R1(550)|??(2) |R2(550)|?|R1(550)|>|R2(450)|?|R1(450)|??(3) |R2(650)|?|R1(650)|>|R2(550)|?|R1(550)|??(4).
    Type: Grant
    Filed: March 4, 2019
    Date of Patent: October 13, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Akira Sakai, Masahiro Hasegawa, Koji Murata, Yuichi Kawahira, Takako Koide, Kiyoshi Minoura
  • Patent number: 10802343
    Abstract: A liquid crystal device (LCD) is configured for minimizing unwanted internal ambient light reflections. The LCD includes a plurality of layers, the layers comprising from a viewing side: a first linear polariser; an external retarder that is made of a cyclic olefin polymer (COP) material or a cyclic olefin copolymer (COC) material; a colour filter substrate; a colour filter layer; an internal reactive mesogen (RM) retarder alignment layer; an internal reactive mesogen (RM) retarder; a liquid crystal (LC) layer; and a second linear polarizer. The external retarder and the internal RM retarder are configured such that the optical properties (for example light polarization control function) of the external retarder and the internal retarder are matched to negate each other for light passing through the external retarder and the internal RM retarder. The LCD simultaneously maintains high image quality in both high and low ambient lighting conditions.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: October 13, 2020
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nathan James Smith, Andrew Acreman, Hywel Hopkin, Kiyoshi Minoura, Koji Murata, Yuichi Kawahira, Akira Sakai, Jiyun Yu
  • Patent number: 10804358
    Abstract: A compound semiconductor device includes: a compound semiconductor area in which a compound semiconductor plug is embedded and formed; and an ohmic electrode provided on the compound semiconductor plug, wherein the compound semiconductor plug includes, in a side surface portion that is as an interface with the compound semiconductor area, a high concentration dopant layer containing a dopant whose concentration is higher than that of other portions.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: October 13, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Kozo Makiyama, Yuichi Minoura
  • Publication number: 20200310201
    Abstract: The liquid crystal display panel includes a first substrate, a second substrate, and a liquid crystal layer provided between the first substrate and the second substrate. The first substrate includes a first dielectric substrate, a first electrode and a second electrode provided on the first dielectric substrate and capable of generating a horizontal electric field in the liquid crystal layer, and a first alignment film being in contact with the liquid crystal layer. The second substrate includes a second dielectric substrate and a second alignment film provided on the second dielectric substrate and being in contact with the liquid crystal layer. The first alignment film has an azimuthal anchoring strength lower than the second alignment film. The liquid crystal layer includes a nematic liquid crystal material and a polymer network.
    Type: Application
    Filed: March 27, 2020
    Publication date: October 1, 2020
    Inventors: KOJI MURATA, KIYOSHI MINOURA, AKIRA SAKAI, YUICHI KAWAHIRA, KOHZOH NAKAMURA
  • Publication number: 20200310200
    Abstract: A photo-alignment film of the present invention includes a polymer layer containing a photoreactive polymer and metal nanoparticles dispersed in the polymer layer at a concentration of 109 particles/(cm2×100 nm) or more and 1019 particles/(cm2×100 nm) or less. The metal nanoparticles have an absorption peak in a wavelength region of 420 nm or less. An absorbance A1 at the absorption peak of the metal nanoparticles and an absorbance A2 at an absorption peak of the polymer layer satisfy a relationship represented by the following formula 1: 0.2?A1/A2?25??(Formula 1).
    Type: Application
    Filed: March 26, 2020
    Publication date: October 1, 2020
    Inventors: KOJI MURATA, AKIRA SAKAI, YUICHI KAWAHIRA, TAKAKO KOIDE, MASAHIRO HASEGAWA, KIYOSHI MINOURA
  • Publication number: 20200310182
    Abstract: The present invention relates to a method for producing a liquid crystal panel. The method includes curing a first reactive mesogen layer with ultraviolet light at an illuminance within a range of 40 to 90 mW/cm2. The liquid crystal panel includes a first transparent base material, a TFT layer and a first alignment film stacked in order on the first transparent base material, a second transparent base material, a color filter layer, an in-cell retardation layer, and a second alignment film stacked in order on the second transparent base material, a liquid crystal layer sandwiched between the first alignment film and the second alignment film, an out-cell retardation layer disposed on a side opposite to a color filter layer side of the second transparent base material, and a pair of linearly polarizing plates arranged so as to sandwich the first transparent base material and the out-cell retardation layer and having transmission axes orthogonal to each other.
    Type: Application
    Filed: March 25, 2020
    Publication date: October 1, 2020
    Inventors: KOJI MURATA, AKIRA SAKAI, YUICHI KAWAHIRA, TAKAKO KOIDE, MASAHIRO HASEGAWA, KIYOSHI MINOURA
  • Patent number: 10782556
    Abstract: A display device in which ambient light reflections, for example, from IPS or FFS type displays are reduced by a circular polariser (e.g., linear polariser combined with external quarter waveplate) to make the light circular polarized, as it traverses the multiple reflective layers between the polariser and LC layer, and then an internal quarter waveplate converts the light back to linear polarisation before it enters the LC, so the display can operate as normal, while the circular polariser absorbs unwanted reflections of ambient light from within the display.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: September 22, 2020
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nathan James Smith, Kiyoshi Minoura, Akira Sakai, Yuichi Kawahira
  • Publication number: 20200249532
    Abstract: A liquid crystal display panel performs displaying in the normally white mode. A first and a second polarizer are disposed so that the transmission axes thereof are perpendicular to each other. A liquid crystal layer is in a twisted alignment state in the absence of an applied voltage. A first substrate has a first electrode having a plurality of rectangular openings extending in parallel to each other, and a second electrode facing the first electrode with a dielectric layer interposed therebetween. The openings each independently have a width S of more than 0.6 ?m and not more than 1.4 ?m, and each pair of adjacent openings independently has a distance L therebetween of not less than 0.3 ?m and not more than 0.7 ?m. A first and a second horizontal alignment film each have an azimuthal anchoring energy of not more than 1×10?4J/m2.
    Type: Application
    Filed: February 3, 2020
    Publication date: August 6, 2020
    Inventors: KOJI MURATA, KOHZOH NAKAMURA, KIYOSHI MINOURA, AKIRA SAKAI, YUICHI KAWAHIRA
  • Patent number: 10725336
    Abstract: The liquid crystal display panel includes: a first polarizing plate; a first ?/4 plate; a first substrate; a second ?/4 plate; a liquid crystal layer; a second substrate; and a second polarizing plate, wherein the first substrate includes a black matrix but no photo spacer, the second substrate includes a photo spacer overlapping with the black matrix, liquid crystal molecules in the liquid crystal layer homogeneously align with no voltage application, the second ?/4 plate covers no side surface of the photo spacer, and the in-plane slow axis of the first ?/4 plate forms an angle of 45° with the transmission axis of the first polarizing plate and is orthogonal to the in-plane slow axis of the second ?/4 plate.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: July 28, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yuichi Kawahira, Akira Sakai, Kozo Nakamura, Masahiro Hasegawa, Takako Koide, Koji Murata, Kiyoshi Minoura
  • Publication number: 20200192165
    Abstract: A liquid crystal display device includes sequentially from a viewing surface side: a first polarizer; an out-cell retardation layer; a first substrate; an in-cell retardation layer; a horizontally aligned liquid crystal layer; a second substrate; and a second polarizer. The liquid crystal display device includes a viewing angle compensation film between the first polarizer and the out-cell retardation layer or between the second substrate and the second polarizer. The out-cell retardation layer is a laminate including sequentially from a viewing surface side: a first retardation layer having an NZ coefficient of 1.0-1.1 and an Re of 120 nm or greater and smaller than 137.5 nm; and a second retardation layer having an Re of 0-10 nm and an Rth of 80-150 nm. The in-cell retardation layer is a third retardation layer having an NZ coefficient of 0.7-1.4 and an Re of 120 nm or greater and smaller than 137.5 nm.
    Type: Application
    Filed: December 5, 2019
    Publication date: June 18, 2020
    Inventors: MASAHIRO HASEGAWA, AKIRA SAKAI, TAKAKO KOIDE, YUICHI KAWAHIRA, KOJI MURATA, KIYOSHI MINOURA
  • Patent number: 10678087
    Abstract: A liquid crystal display panel includes a first ?/4 retardation layer, a first substrate, a color filter layer, a liquid crystal layer containing horizontally aligned liquid crystals, and a second ?/4 retardation layer that is formed from a different material from the first ?/4 retardation layer between the first substrate and the color filter layer or between the color filter layer and the liquid crystal layer. The second ?/4 retardation layer has a smaller thickness in a region overlapping the blue color filter than in a region overlapping the green color filter. The first ?/4 retardation layer provides a retardation Rout(?) to light having a wavelength of ? nm. The second ?/4 retardation layer provides a retardation Rin(?). The retardation Rout(?) and the retardation Rin(?) satisfy the following formula (1) in the region overlapping the blue color filter. ?1.0 nm<Rin(450)?Rout(450)<10.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: June 9, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Akira Sakai, Yuichi Kawahira, Koji Murata, Masahiro Hasegawa, Takako Koide, Kozo Nakamura, Kiyoshi Minoura
  • Patent number: 10670911
    Abstract: The liquid crystal display panel includes: a first polarizing plate; a first ?/4 plate; a first substrate; a second ?/4 plate; a liquid crystal layer; a second substrate; and a second polarizing plate, wherein the first substrate includes a black matrix, and a photo spacer overlapping with the black matrix, d crystal molecules in the liquid crystal layer homogeneously align with no voltage application, the second ?/4 plate is made of a self-assembling photo alignment material containing a photo functional group capable of causing at least one chemical reaction selected from the group consisting of photodimerization, photoisomerization, and photo-Fries rearrangement, and covers a side surface of the photo spacer, and the in-plane stow axis of the first ?/4 plate forms an angle of 45° with the transmission axis of the first polarizing plate and is orthogonal to the in-plane slow axis of the second ?/4 plate.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: June 2, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Yuichi Kawahira, Akira Sakai, Kozo Nakamura, Masahiro Hasegawa, Takako Koide, Koji Murata, Kiyoshi Minoura
  • Publication number: 20200166800
    Abstract: A display device in which ambient light reflections, for example, from IPS or FFS type displays are reduced by a circular polariser (e.g., linear polariser combined with external quarter waveplate) to make the light circular polarized, as it traverses the multiple reflective layers between the polariser and LC layer, and then an internal quarter waveplate converts the light back to linear polarisation before it enters the LC, so the display can operate as normal, while the circular polariser absorbs unwanted reflections of ambient light from within the display.
    Type: Application
    Filed: January 31, 2020
    Publication date: May 28, 2020
    Inventors: Nathan James Smith, Kiyoshi Minoura, Akira Sakai, Yuichi Kawahira
  • Publication number: 20200159066
    Abstract: A liquid crystal display device includes a liquid crystal panel and a circularly polarizing plate disposed on a viewing side of the liquid crystal panel. The circularly polarizing plate sequentially includes, from a viewing side, a linearly polarizing plate and an out-cell retarder. The liquid crystal panel includes a thin-film transistor substrate, a color filter substrate facing the thin-film transistor substrate and including black matrix, a horizontal alignment liquid crystal layer disposed between the thin-film transistor substrate and the color filter substrate, and an in-cell retarder disposed in one substrate disposed on the viewing side selected from the thin-film transistor substrate and the color filter substrate. The in-cell retarder is disposed outside a region between the black matrix and the horizontal alignment liquid crystal layer.
    Type: Application
    Filed: November 14, 2019
    Publication date: May 21, 2020
    Inventors: YUICHI KAWAHIRA, TAKAKO KOIDE, AKIRA SAKAI, KIYOSHI MINOURA