Patents by Inventor Katsufumi Ohmuro
Katsufumi Ohmuro 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: 20190004225Abstract: The present invention relates to an optical film which ensures adhesiveness between a polymer film and a liquid crystal layer without deteriorating the alignment of a liquid crystal compound; a polarizing plate using the same; an image display device; a method for producing an optical film; and a method for producing a polarizing plate. The optical film includes a polymer film including a cycloolefin-based polymer, and a liquid crystal layer that is provided adjacent to the polymer film, in which the liquid crystal layer is formed by using a liquid crystal composition containing a liquid crystal compound and a compound having a specific structure, where the liquid crystal composition contains the compound having a specific structure at a content of 0.5% to 7.0% by mass with respect to a mass of the liquid crystal compound, and a predetermined eccentricity value is 20% to 80%.Type: ApplicationFiled: September 6, 2018Publication date: January 3, 2019Applicant: FUJIFILM CorporationInventors: Koji IIJIMA, Tatsuya IWASAKI, Katsufumi OHMURO, Masaaki SUZUKI
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Patent number: 10156754Abstract: A liquid-crystal display device having a backlight unit emitting unpolarized blue light, a light conversion member, a polarization separating member, a backlight-side polarizer, a liquid crystal cell, and a display-side polarizing plate wherein the polarization separating member separates the unpolarized blue light into blue transmitted light and blue reflected light which are linearly polarized in vibration directions that are orthogonal to each other, and transmits some of light in a wavelength range each of 500 nm to 600 nm and 600 nm to 650 nm, the light conversion member includes a fluorescent material that, due to blue light entering the light conversion member, emits green light which is linearly-polarized light and red light which is linearly-polarized light; and a transmission axis of the backlight-side polarizer is parallel to vibration directions of the green and red light, is improved in terms of front surface luminance and color reproduction region.Type: GrantFiled: January 20, 2016Date of Patent: December 18, 2018Assignee: FUJIFILM CorporationInventors: Ryuji Saneto, Katsufumi Ohmuro
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Publication number: 20180272593Abstract: A phase difference film includes a liquid crystal layer in which a disk-like liquid crystal compound is fixed in a homeotropic alignment state, in which an in-plane retardation Re of the liquid crystal layer satisfies 200 nm?Re?300 nm and a retardation Rth in a thickness direction satisfies ?30 nm?Rth.Type: ApplicationFiled: May 29, 2018Publication date: September 27, 2018Applicant: FUJIFILM CorporationInventors: Koji IIJIMA, Jun TAKEDA, Katsufumi OHMURO
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Patent number: 10007042Abstract: There is provided a composition containing a discotic liquid crystal compound, a chiral agent, and a surfactant which can form a light reflecting layer formed by fixing a cholesteric liquid crystalline phase, which exhibits excellent durability under a hot and humid environment and excellent heat resistance, and has few alignment defects; a light reflecting film; a luminance-improving film; a backlight unit; and a liquid crystal display device.Type: GrantFiled: September 15, 2016Date of Patent: June 26, 2018Assignee: FUJIFILM CorporationInventors: Hiroyuki Ishikawa, Shinichi Morishima, Mitsuyoshi Ichihashi, Katsufumi Ohmuro, Akio Tamura, Wataru Hoshino
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Patent number: 10001673Abstract: An optical sheet member includes a polarizing plate including a polarizer, a brightness enhancement film including a reflection polarizer, and a ?/4 plate, in which the reflection polarizer includes a first light reflecting layer which has a reflection center wavelength range of 430 nm to 480 nm, and is formed by fixing a cholesteric liquid crystalline phase emitting circular polarization light, a second light reflecting layer which has a reflection center wavelength range of 500 nm to 600 nm, and a third light reflecting layer which has a reflection center wavelength range of 600 nm to 650 nm, and both formed by fixing a cholesteric liquid crystalline phase emitting circular polarization light, and the brightness enhancement film includes the ?/4 plate satisfying 550 nm/4?25 nm<Re(550)<550 nm/4+25 nm between the polarizer and the reflection polarizer.Type: GrantFiled: December 4, 2015Date of Patent: June 19, 2018Assignee: FUJIFILM CorporationInventors: Yukito Saitoh, Katsufumi Ohmuro, Akiko Watano, Hiroshi Sato
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Patent number: 10001674Abstract: Provided are a brightness enhancement film including a ?/4 plate, and a reflection polarizer, in which the reflection polarizer includes at least two light reflection layers formed by immobilizing a cholesteric liquid crystalline phase, one light reflection layer of the reflection layers is a layer formed of a polymerizable liquid crystal composition containing a rod-like liquid crystal compound, and the other light reflection layer is a layer formed of a polymerizable liquid crystal composition containing a disk-like liquid crystal compound, and an optical sheet member including the brightness enhancement film, and a liquid crystal display device including the optical sheet member. The brightness enhancement film of the present invention has high brightness and is able to suppress an oblique change in the shade at the time of being incorporated in a liquid crystal display device.Type: GrantFiled: August 8, 2016Date of Patent: June 19, 2018Assignee: FUJIFILM CorporationInventors: Jun Takeda, Yuki Matsuda, Nobuyuki Akutagawa, Kotaro Yasuda, Katsufumi Ohmuro, Hideyuki Nishikawa, Akiko Watano, Yukito Saitoh, Mitsuyoshi Ichihashi, Wataru Hoshino, Hiroyuki Ishikawa
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Publication number: 20180164481Abstract: The present invention includes an optical element of which an oblique tint change can be improved in a case of the optical element is incorporated to a liquid crystal display device, a method of manufacturing an optical element, and a liquid crystal display device. The optical element includes: a reflection polarizer which is formed of a discotic liquid crystal compound and in which a cholesteric liquid crystalline phase is immobilized, in which, in the reflection polarizer, a front retardation value Re satisfies 0 nm?Re<10 nm in a range of ±50 nm outside a reflection center wavelength, and an absolute value |Ret (50°)| of a retardation value Ret in a polar angle 50° direction satisfies |Ret (50°)|?50 nm.Type: ApplicationFiled: February 12, 2018Publication date: June 14, 2018Applicant: FUJIFILM CorporationInventors: Kunihiro ATSUMI, Yukito SAITOH, Katsufumi OHMURO, Jun TAKEDA, Shinichi MORISHIMA
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Patent number: 9946111Abstract: A liquid crystal display device improved in front surface luminance, having a backlight unit, a light conversion member, a polarization separating member, a liquid crystal cell, and a display-side polarizer; the backlight unit includes an unpolarized blue light source and a reflection member that converts circularly-polarized to unpolarized blue light and reflects same; the light conversion member includes a circularly polarized luminescence fluorescent material that emits green and red lights which are circularly-polarized; the polarization separating member includes a reflection polarizer that separates the unpolarized blue light into blue transmitted light that is right- or left-circularly-polarized light and blue reflected light that is the other circularly-polarized light and a ?/4 plate that converts the blue transmitted light, the green and red lights, which are circularly-polarized, to linearly-polarized lights; and an absorption axis of the display-side polarizer is parallel to vibration directions oType: GrantFiled: February 23, 2016Date of Patent: April 17, 2018Assignee: FUJIFILM CorporationInventors: Ryuji Saneto, Katsufumi Ohmuro
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Patent number: 9915837Abstract: Provided is a liquid crystal display device including a liquid crystal cell, a backlight side polarizer, an optical thin film which forms an air interface, and a backlight unit, in this order. The liquid crystal display device satisfies n (535)<nu (535) and n (535)×d is 1.15-1.25 ?m, 1.42-1.52 ?m or 1.69-1.79 ?m in which n (535) and nu (535) represent a refractive index of the optical thin film and a layer directly adjacent to the optical thin film, respectively, and d represents a thickness of the optical thin film. The liquid crystal display device is capable of matching a peak of light transmittance to light emission peak wavelength of emission line light of RGB. The layer directly adjacent to the optical thin film is the backlight side polarizer or the substrate.Type: GrantFiled: February 8, 2016Date of Patent: March 13, 2018Assignee: FUJIFILM CorporationInventors: Yukito Saitoh, Katsufumi Ohmuro, Akiko Watano
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Patent number: 9829615Abstract: The present invention provides a luminance-enhancing film including a ?/4 plate, and a reflection polarizer, including a first light reflection layer, a second light reflection layer, and a third light reflection layer from the ?/4 plate side sequentially, the light reflection layers being light reflection layers formed by fixing a cholesteric liquid crystalline phase, and including blue, green and red light reflection layers, and Rth(550) of the first light reflection layer and Rth(550) of the second light reflection layer having inverse signs; and a luminance-enhancing film including a ?/4 plate and a reflection polarizer including at least a light reflection layer formed of a rod-like cholesteric liquid crystal material and a light reflection layer formed of a disk-like cholesteric liquid crystal material. The luminance-enhancing film has high luminance and is able to suppress an oblique change in the color.Type: GrantFiled: February 24, 2016Date of Patent: November 28, 2017Assignee: FUJIFILM CORPORATIONInventors: Akiko Watano, Yukito Saitoh, Katsufumi Ohmuro, Mitsuyoshi Ichihashi, Hiroyuki Ishikawa, Kotaro Yasuda, Hideyuki Nishikawa, Yuki Matsuda, Wataru Hoshino
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Patent number: 9733512Abstract: A liquid crystal display device, in which a backlight unit, a light conversion member, a selective reflection member, a liquid crystal cell, and a display-side polarizer are disposed in this order, the backlight unit includes a light source that emits unpolarized light having a light emission central wavelength in a wavelength range of 300 nm to lower than 430 nm, the selective reflection member reflects 60% to 100% of the unpolarized light entering the selective reflection member and transmits at least some of light in a wavelength of higher than 430 nm to 650 nm, and the light conversion member includes an aligned fluorescent material that emits blue, green and red light which are linearly polarized in a vibration direction parallel to an absorption axis of the display-side polarizer, is improved in terms of the front surface luminance.Type: GrantFiled: February 4, 2016Date of Patent: August 15, 2017Assignee: FUJIFILM CorporationInventors: Ryuji Saneto, Katsufumi Ohmuro
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Patent number: 9638953Abstract: Provided is a liquid crystal display device including a viewer-side polarizing plate 1, a liquid crystal cell 11, a backlight-side polarizing plate 21, and a backlight unit 31; in which a three-wavelength (RGB) backlight light source having a narrow half bandwidth of the light emission intensity spectrum is used, and the viewer-side polarizing plate includes, for example, a first absorption material which has a maximum value of absorbance in a wavelength range of 470 nm to 510 nm and has a peak of the absorbance full width at half maximum of which is 50 nm or lower.Type: GrantFiled: February 4, 2016Date of Patent: May 2, 2017Assignee: FUJIFILM CORPORATIONInventors: Akiko Watano, Yukito Saitoh, Katsufumi Ohmuro, Mitsuyoshi Ichihashi
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Publication number: 20170115528Abstract: An aspect of the present invention relates to a liquid crystal panel including a visible side polarizing plate, a liquid crystal cell, and a backlight side polarizing plate, in which the backlight side polarizing plate is a reflective polarizing plate of which a degree of polarization P550 nm with respect to light at a wavelength of 550 nm is greater than or equal to 99.90%, and the reflective polarizing plate and the liquid crystal cell are integrally laminated, a liquid crystal display device, and a reflective polarizing plate and a manufacturing method thereof.Type: ApplicationFiled: January 5, 2017Publication date: April 27, 2017Applicant: FUJIFILM CorporationInventors: Katsufumi OHMURO, Yukito SAITOH, Takashi YONEMOTO
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Patent number: 9632229Abstract: A liquid crystal display device having high transmittance and a high color reproduction region, which includes a backlight unit including a light conversion member; and a liquid crystal cell and in which the light conversion member includes a light conversion layer containing a fluorescent material and an optical film arranged on both surfaces of the light conversion layer, the optical film includes an optical thin film forming an air interface, and a layer directly adjacent to the optical thin film, the liquid crystal display device satisfies n(535)<nu(535), n(535)×d is in a specific range, transmittance of a laminated body of the optical thin film and the layer directly adjacent to the optical thin film is in a specific range, and the backlight unit emits blue light, green light, and red light.Type: GrantFiled: February 11, 2016Date of Patent: April 25, 2017Assignee: FUJIFILM CORPORATIONInventors: Naoyoshi Yamada, Tatsuya Oba, Yukito Saitoh, Katsufumi Ohmuro, Akiko Watano
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Publication number: 20170010398Abstract: There is provided a composition containing a discotic liquid crystal compound, a chiral agent, and a surfactant which can form a light reflecting layer formed by fixing a cholesteric liquid crystalline phase, which exhibits excellent durability under a hot and humid environment and excellent heat resistance, and has few alignment defects; a light reflecting film; a luminance-improving film; a backlight unit; and a liquid crystal display device.Type: ApplicationFiled: September 15, 2016Publication date: January 12, 2017Applicant: FUJIFILM CorporationInventors: Hiroyuki ISHIKAWA, Shinichi MORISHIMA, Mitsuyoshi ICHIHASHI, Katsufumi OHMURO, Akio TAMURA, Wataru HOSHINO
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Publication number: 20160349573Abstract: Provided are an optical sheet member including an optical conversion sheet containing a fluorescent material which absorbs at least a part of light in a wavelength range of 380 nm to 480 nm, converts the absorbed light into light in a wavelength range longer than that of the absorbed light, and re-emits the converted light, and a wavelength selective reflective polarizer functioning in the wavelength range of at least a part of the light in the wavelength range of 380 nm to 480 nm, in which both of front brightness and a color reproduction range are improved in a case of being incorporated into a display device using backlight which emits light having at least a blue wavelength range; and the display device.Type: ApplicationFiled: June 21, 2016Publication date: December 1, 2016Applicant: FUJIFILM CorporationInventors: Katsufumi OHMURO, Yukito SAITOH, Takashi YONEMOTO, Hideyuki NISHIKAWA, Yoji ITO
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Publication number: 20160342003Abstract: Provided are a brightness enhancement film including a ?/4 plate, and a reflection polarizer, in which the reflection polarizer includes at least two light reflection layers formed by immobilizing a cholesteric liquid crystalline phase, one light reflection layer of the reflection layers is a layer formed of a polymerizable liquid crystal composition containing a rod-like liquid crystal compound, and the other light reflection layer is a layer formed of a polymerizable liquid crystal composition containing a disk-like liquid crystal compound, and an optical sheet member including the brightness enhancement film, and a liquid crystal display device including the optical sheet member. The brightness enhancement film of the present invention has high brightness and is able to suppress an oblique change in the shade at the time of being incorporated in a liquid crystal display device.Type: ApplicationFiled: August 8, 2016Publication date: November 24, 2016Applicant: FUJIFILM CorporationInventors: Jun TAKEDA, Yuki MATSUDA, Nobuyuki AKUTAGAWA, Kotaro YASUDA, Katsufumi OHMURO, Hideyuki NISHIKAWA, Akiko WATANO, Yukito SAITOH, Mitsuyoshi ICHIHASHI, Wataru HOSHINO, Hiroyuki ISHIKAWA
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Publication number: 20160238774Abstract: The light guide plate includes a light exit surface from which light incident from an end surface exits, and a back surface facing the light exit surface, in which the light guide plate includes a plurality of diffuse reflection patterns containing an inorganic material on the back surface, arid a quantum dot exists on at least one surface selected from a group consisting of at least the light exit surface, the back surface, and the end surface in the shape of a pattern.Type: ApplicationFiled: February 23, 2016Publication date: August 18, 2016Applicant: FUJIFILM CorporationInventors: Yoshio KOIKE, Katsufumi OHMURO
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Publication number: 20160170114Abstract: The present invention provides a luminance-enhancing film including a ?/4 plate, and a reflection polarizer, including a first light reflection layer, a second light reflection layer, and a third light reflection layer from the ?/4 plate side sequentially, the light reflection layers being light reflection layers formed by fixing a cholesteric liquid crystalline phase, and including blue, green and red light reflection layers, and Rth(550) of the first light reflection layer and Rth(550) of the second light reflection layer having inverse signs; and a luminance-enhancing film including a ?/4 plate and a reflection polarizer including at least a light reflection layer formed of a rod-like cholesteric liquid crystal material and a light reflection layer formed of a disk-like cholesteric liquid crystal material. The luminance-enhancing film has high luminance and is able to suppress an oblique change in the color.Type: ApplicationFiled: February 24, 2016Publication date: June 16, 2016Applicant: FUJIFILM CorporationInventors: Akiko WATANO, Yukito SAITOH, Katsufumi OHMURO, Mitsuyoshi ICHIHASHI, Hiroyuki ISHIKAWA, Kotaro YASUDA, Hideyuki NISHIKAWA, Yuki MATSUDA, Wataru HOSHINO
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Publication number: 20160170262Abstract: A liquid crystal display device improved in front surface luminance, having a backlight unit, a light conversion member, a polarization separating member, a liquid crystal cell, and a display-side polarizer; the backlight unit includes an unpolarized blue light source and a reflection member that converts circularly-polarized to unpolarized blue light and reflects same; the light conversion member includes a circularly polarized luminescence fluorescent material that emits green and red lights which are circularly-polarized; the polarization separating member includes a reflection polarizer that separates the unpolarized blue light into blue transmitted light that is right- or left-circularly-polarized light and blue reflected light that is the other circularly-polarized light and a ?/4 plate that converts the blue transmitted light, the green and red lights, which are circularly-polarized, to linearly-polarized lights; and an absorption axis of the display-side polarizer is parallel to vibration directions oType: ApplicationFiled: February 23, 2016Publication date: June 16, 2016Applicant: FUJIFILM CorporationInventors: Ryuji SANETO, Katsufumi OHMURO