Patents by Inventor Koichi Igeta
Koichi Igeta 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).
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Publication number: 20240045274Abstract: According to one embodiment, a display device includes a first substrate, a second substrate opposed to the first substrate, a sealing member bonding the first substrate with the second substrate, and a liquid crystal layer between the first substrate and the second substrate. From an aspect, the sealing member includes a first sealing member surrounding a display area including a plurality of pixels, and a second sealing member formed of a same material as the first sealing member and arranged in the display area.Type: ApplicationFiled: August 7, 2023Publication date: February 8, 2024Applicant: Japan Display Inc.Inventors: Koichi IGETA, Tenfu NAKAMURA, Kentaro OKUYAMA
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Publication number: 20240045273Abstract: According to one embodiment, a liquid crystal optical element includes a substrate, a first alignment control layer disposed on the substrate and comprising projections arranged at a predetermined pitch, and a first liquid crystal layer disposed on the first alignment control layer. The first liquid crystal layer comprises liquid crystal molecules which are aligned such that major axes of the liquid crystal molecules extend along the projections, respectively, and cured in a state where alignment directions of the liquid crystal molecules are fixed. The first alignment control layer is formed of a crosslinkable liquid crystal polymer.Type: ApplicationFiled: August 1, 2023Publication date: February 8, 2024Applicant: Japan Display Inc.Inventors: Yasushi TOMIOKA, Shinichiro OKA, Koichi IGETA, Junji KOBASHI, Ayaka HIGUCHI
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Publication number: 20240036430Abstract: According to one embodiment, a method of manufacturing a liquid crystal element, includes forming an alignment layer on a support, forming a cholesteric liquid crystal layer containing a plasticizer and having elasticity on the alignment layer, adhering a flexible substrate to the cholesteric liquid crystal layer via a first adhesive layer, peeling the cholesteric liquid crystal layer adhered to the flexible substrate, off from the support and the alignment layer, adhering the cholesteric liquid crystal layer to a rigid substrate via a second adhesive layer and removing the flexible substrate and the first adhesive layer.Type: ApplicationFiled: July 31, 2023Publication date: February 1, 2024Applicant: Japan Display Inc.Inventors: Hiroumi KINJO, Koichi IGETA, Shinichiro OKA
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Publication number: 20240019738Abstract: According to one embodiment, a display device includes first and second substrates and a liquid crystal layer. The first substrate includes pixel electrodes and a first alignment film. The second substrate includes a common electrode and a second alignment film. The liquid crystal layer is provided between the alignment films and contains a streaky polymer and liquid crystal molecules. The first alignment film includes flat areas. A first director of the liquid crystal molecules located near the flat areas is substantially parallel to a horizontal plane in a state where no potential difference is formed between the pixel electrodes and the common electrode.Type: ApplicationFiled: July 11, 2023Publication date: January 18, 2024Applicant: Japan Display Inc.Inventors: Koichi IGETA, Kentaro OKUYAMA, Koji KITAMURA
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Publication number: 20240015993Abstract: According to one embodiment, a photovoltaic cell device includes a transparent substrate including a first main surface and a second main surface opposed to the first main surface, a liquid crystal layer disposed on the second main surface side of the transparent substrate and including a cholesteric liquid crystal including liquid crystal molecules, and photovoltaic cells disposed on at least one of the first main surface side and the second main surface side of the transparent substrate, each formed into a strip shape, and arranged with a predetermined gap between the photovoltaic cells.Type: ApplicationFiled: July 3, 2023Publication date: January 11, 2024Applicant: Japan Display Inc.Inventors: Shinichiro OKA, Koichi IGETA, Yasuyuki YAMADA, Hiroumi KINJO
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Publication number: 20240004240Abstract: According to one embodiment, a method of manufacturing a display device comprises applying an alignment film material containing a photolytic component and a non-photolytic component to a surface of a first substrate and a surface of a second substrate, forming a first alignment film on the first substrate and a second alignment film on the second substrate, introducing a liquid crystal material containing liquid crystal molecules and a polymerizable monomer between the first alignment film and the second alignment film, and applying ultraviolet light to the liquid crystal material to polymerize the polymerizable monomer in the liquid crystal material to form a polymer dispersed liquid crystal layer.Type: ApplicationFiled: September 15, 2023Publication date: January 4, 2024Applicant: Japan Display Inc.Inventors: Koichi IGETA, Ayaka HIGUCHI
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Publication number: 20230408743Abstract: According to one embodiment, a liquid crystal optical element includes a first liquid crystal layer including a first cholesteric liquid crystal and a second liquid crystal layer including a second cholesteric liquid crystal, a helical pitch of each of the first cholesteric liquid crystal and the second cholesteric liquid crystal changing continuously. The first cholesteric liquid crystal including a first portion having a first helical pitch and a second portion having a second helical pitch different from the first helical pitch. The second cholesteric liquid crystal including a third portion having a third helical pitch and a fourth portion having a fourth helical pitch different from the third helical pitch.Type: ApplicationFiled: June 8, 2023Publication date: December 21, 2023Applicants: Japan Display Inc., OSAKA UNIVERSITYInventors: Ayaka HIGUCHI, Koichi IGETA, Shinichiro OKA, Yasushi TOMIOKA, Hiroyuki YOSHIDA
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Publication number: 20230393433Abstract: To improve the display quality of a display device, the display device includes a display section and a frame section surrounding a periphery of the display section. A substrate in the display device includes a conductor pattern constituting a circuit section and an insulating film serving as an organic film covering the conductor pattern. The insulating film extends to a peripheral edge of the substrate. A slit, which penetrates the insulating film in a thickness direction, is formed in a corner part of the insulating film. The slit is formed at a position not overlapping the circuit section.Type: ApplicationFiled: August 18, 2023Publication date: December 7, 2023Inventors: Koichi IGETA, Hirotaka IMAYAMA
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Publication number: 20230375764Abstract: According to one embodiment, a liquid crystal optical element includes a transparent substrate including a main surface, an alignment film disposed on the main surface, and a liquid crystal layer overlapping the alignment film and including a cholesteric liquid crystal including liquid crystal molecules stacked helically and an additive exhibiting a liquid crystalline property. In the liquid crystal layer, a reflective surface along which alignment directions of the liquid crystal molecules are identical is inclined with respect to the main surface.Type: ApplicationFiled: May 17, 2023Publication date: November 23, 2023Applicants: Japan Display Inc., Osaka UniversityInventors: Koichi IGETA, Shinichiro OKA, Yasushi TOMIOKA, Hiroyuki YOSHIDA
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Publication number: 20230375874Abstract: According to one embodiment, a liquid crystal optical element comprises a transparent substrate comprising a first main surface and a second main surface opposed to the first main surface, an alignment film disposed on the second main surface, and a liquid crystal layer overlapping the alignment film and comprising a cholesteric liquid crystal and an additive exhibiting a liquid crystalline property. Refractive anisotropy of the additive is greater than refractive anisotropy of the liquid crystal layer.Type: ApplicationFiled: May 16, 2023Publication date: November 23, 2023Applicants: Japan Display Inc., OSAKA UNIVERSITYInventors: Koichi IGETA, Yasushi TOMIOKA, Shinichiro OKA, Hiroyuki YOSHIDA
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Patent number: 11774807Abstract: To improve the display quality of a display device, the display device includes a display section and a frame section surrounding a periphery of the display section. A substrate in the display device includes a conductor pattern constituting a circuit section and an insulating film serving as an organic film covering the conductor pattern. The insulating film extends to a peripheral edge of the substrate. A slit, which penetrates the insulating film in a thickness direction, is formed in a corner part of the insulating film. The slit is formed at a position not overlapping the circuit section.Type: GrantFiled: January 10, 2023Date of Patent: October 3, 2023Assignee: Japan Display Inc.Inventors: Koichi Igeta, Hirotaka Imayama
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Publication number: 20230280625Abstract: The purpose of the present invention is to realize a high contrast ratio in a liquid crystal display device by stacking two liquid crystal display panels without deterioration of screen brightness and weather resistance. The concrete structure is as follows. A liquid crystal display device including; a first liquid crystal display panel, a second liquid crystal display panel and a back light being superposed; in which a negative type liquid crystal is used in one of the first liquid crystal display panel and the second liquid crystal display panel, a TFT and a color filter are formed on the TFT substrate, the counter substrate is nearer to the back light than the TFT substrate is, and a color filter is not formed in a liquid crystal display panel of another one of the first liquid crystal display panel and the second liquid crystal display panel.Type: ApplicationFiled: September 12, 2022Publication date: September 7, 2023Inventor: Koichi IGETA
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Patent number: 11726363Abstract: According to one embodiment, a liquid crystal element includes a first transparent substrate, a second transparent substrate, and a first liquid crystal layer cured. The first liquid crystal layer contains first cholesteric liquid crystal and has a reflective surface which reflects first circularly polarized light having a first wavelength. A first helical axis of the first cholesteric liquid crystal is tilted in a uniform direction over an entire area of the first liquid crystal layer. Each of a first outer surface of the first transparent substrate and a second outer surface of the second transparent substrate forms an interface which totally reflects the first circularly polarized light reflected in the first liquid crystal layer.Type: GrantFiled: March 21, 2022Date of Patent: August 15, 2023Assignee: Japan Display Inc.Inventor: Koichi Igeta
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Publication number: 20230236454Abstract: According to one embodiment, a camera module includes a liquid crystal panel, an image sensor and an optical system. The liquid crystal panel is configured to display a coded aperture pattern. The optical system is interposed between the liquid crystal panel and the image sensor. The liquid crystal panel includes a liquid crystal layer containing liquid crystal molecules and dichroic dye molecules aligned following the liquid crystal molecules.Type: ApplicationFiled: January 23, 2023Publication date: July 27, 2023Inventors: Koichi IGETA, Kasumi HASE, Yoshiro AOKI
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Publication number: 20230161201Abstract: To improve the display quality of a display device, the display device includes a display section and a frame section surrounding a periphery of the display section. A substrate in the display device includes a conductor pattern constituting a circuit section and an insulating film serving as an organic film covering the conductor pattern. The insulating film extends to a peripheral edge of the substrate. A slit, which penetrates the insulating film in a thickness direction, is formed in a corner part of the insulating film. The slit is formed at a position not overlapping the circuit section.Type: ApplicationFiled: January 10, 2023Publication date: May 25, 2023Inventors: Koichi IGETA, Hirotaka IMAYAMA
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Patent number: 11604384Abstract: According to one embodiment, a liquid crystal element includes a transparent substrate including a first main surface, a plurality of structures disposed on the first main surface and arranged along one direction, an alignment film disposed on a surface of each of the structures and a liquid crystal layer containing a cholesteric liquid crystal and in contact with the alignment film, and the helical axis of the cholesteric liquid crystal is inclined with respect to the first main surface, each of the plurality of structures includes a first surface inclined with respect to the first main surface, in the plurality of structures, the first surfaces are parallel to each other, and the alignment film is interposed between the first surface and the liquid crystal layer.Type: GrantFiled: March 16, 2022Date of Patent: March 14, 2023Assignee: Japan Display Inc.Inventors: Junji Kobashi, Shinichiro Oka, Yasushi Tomioka, Koichi Igeta
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Patent number: 11579492Abstract: According to one embodiment, a liquid crystal optical element includes a substrate, a plurality of structures, a first liquid crystal layer including a plurality of liquid crystal molecules having alignment directions fixed, and a second liquid crystal layer including a plurality of liquid crystal molecules having alignment directions fixed. In an area overlapping a groove, a first director of the first liquid crystal layer extends along the groove, and a second director of the second liquid crystal layer is uniformly aligned with the first director of the second surface side, on the third surface side, and turns in planar view.Type: GrantFiled: March 21, 2022Date of Patent: February 14, 2023Assignee: Japan Display Inc.Inventors: Shinichiro Oka, Yasushi Tomioka, Koichi Igeta, Junji Kobashi
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Patent number: 11573458Abstract: To improve the display quality of a display device, the display device includes a display section and a frame section surrounding a periphery of the display section. A substrate in the display device includes a conductor pattern constituting a circuit section and an insulating film serving as an organic film covering the conductor pattern. The insulating film extends to a peripheral edge of the substrate. A slit, which penetrates the insulating film in a thickness direction, is formed in a corner part of the insulating film. The slit is formed at a position not overlapping the circuit section.Type: GrantFiled: May 4, 2022Date of Patent: February 7, 2023Assignee: Japan Display Inc.Inventors: Koichi Igeta, Hirotaka Imayama
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Patent number: 11556030Abstract: According to one embodiment, a liquid crystal display device includes a first liquid crystal device, a second liquid crystal device, and a liquid crystal display panel, the first liquid crystal device including a first substrate including a first electrode thereon, a second substrate including a second electrode thereon, and a first cholesteric liquid crystal layer, the second liquid crystal device including a third substrate including a third electrode thereon, a fourth substrate including a fourth electrode thereon, and a second cholesteric liquid crystal layer, wherein the first liquid crystal device and the second liquid crystal device are stacked successively.Type: GrantFiled: March 25, 2022Date of Patent: January 17, 2023Assignee: JAPAN DISPLAY INC.Inventors: Kasumi Hase, Koichi Igeta, Shinichi Komura
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Patent number: 11550188Abstract: The purpose of the present invention is to realize the photo alignment film which has good alignment ability and good adhesive strength with the seal material. The structure of the invention is: A liquid crystal display device including a first substrate, having pixel electrodes and a first alignment film, and a second substrate adhere to each other by seal material, and the liquid crystal being sealed inside, in which the first alignment film is formed from a first polyimide, which receives a photo alignment treatment, and a second polyimide, which does not receive the photo alignment treatment, the first polyimide exists 75 to 98 weight % at a surface of the first alignment film on the pixel electrode and at an interface with the seal material, the second polyimide increases gradually in going to depth direction from the surface of the first alignment film in a cross sectional view.Type: GrantFiled: September 24, 2021Date of Patent: January 10, 2023Assignee: Japan Display Inc.Inventors: Ayaka Higuchi, Koichi Igeta