Patents by Inventor Masahiro Hasegawa
Masahiro Hasegawa 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: 20220043301Abstract: A liquid crystal display panel includes a first substrate, a second substrate, a liquid crystal layer, a first polarizer plate, and a second polarizer plate. The first substrate includes a first dielectric substrate, a first electrode, a second electrode, and a first alignment film. The second electrode includes a plurality of slits and a conductive portion. The second substrate includes a second dielectric substrate and a second alignment film. The first substrate further includes a resin layer disposed between the second electrode and the first alignment film. The resin layer within the plurality of slits is as thick as or thicker than the second electrode. The plurality of slits are filled with the resin layer. A difference in height between the resin layer over the conductive portion of the second electrode and the resin layer within the plurality of slits of the second electrode is 10 nm or more.Type: ApplicationFiled: August 4, 2021Publication date: February 10, 2022Inventors: Akira SAKAI, Masahiro HASEGAWA, Miho YAMADA, Yuichi KAWAHIRA, Koji MURATA, Kiyoshi MINOURA
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Publication number: 20210373382Abstract: Provided is a liquid crystal display device and a polarizing plate capable of improving the contrast ratio in the front direction. The polarizing plate includes a pair of polarizers including a first polarizer and a second polarizer whose transmission axes are parallel to each other; a retarder between the paired polarizers; and a diffusion layer in at least one of a region between the paired polarizers or a region on a side without the retarder of the first polarizer.Type: ApplicationFiled: May 27, 2021Publication date: December 2, 2021Inventors: Akira Sakai, Yuichi Kawahira, Masahiro Hasegawa, Kiyoshi Minoura
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Patent number: 11181770Abstract: A liquid crystal display panel includes a first substrate, a second substrate, a liquid crystal layer, a first polarizing plate, and a second polarizing plate. The first substrate includes a first dielectric substrate, first and second electrodes, provided over the first dielectric substrate and configured to generate a transverse electric field in the liquid crystal layer, at least either of which has a plurality of slits, and a first alignment film placed in contact with the liquid crystal layer. The first substrate further includes an inorganic insulating layer provided between the second electrode and the first alignment film. The difference between the refractive index of the inorganic insulating layer and the refractive index of the second electrode is smaller than or equal to 0.20. The thickness of the inorganic insulating layer is greater than or equal to 50% of the thickness of the second electrode and greater than or equal to 40 nm.Type: GrantFiled: March 10, 2021Date of Patent: November 23, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Akira Sakai, Masahiro Hasegawa, Miho Yamada, Koji Murata, Kiyoshi Minoura
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Patent number: 11169419Abstract: 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: GrantFiled: March 26, 2020Date of Patent: November 9, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Koji Murata, Akira Sakai, Yuichi Kawahira, Takako Koide, Masahiro Hasegawa, Kiyoshi Minoura
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Publication number: 20210341787Abstract: A circular polarizer according to the disclosure includes a ?/4 layer, and a polarization layer that is layered on the ?/4 layer and includes a lyotropic liquid crystal, and an overcoat layer covering an upper surface and a side surface of the polarization layer and a side surface of the ?/4 layer is formed.Type: ApplicationFiled: September 28, 2018Publication date: November 4, 2021Inventors: MASAHIRO HASEGAWA, MIHO YAMADA, AKIRA SAKAI
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Patent number: 11131891Abstract: The present invention provides a liquid crystal display device of a transverse electric field mode that may inhibit internal reflection and realize proper black display to which coloring does not occur. The present invention provides a liquid crystal display device including a first linear polarizer, a first ?/4 retardation layer, a first substrate, a second ?/4 retardation layer configured with a different material from the first ?/4 retardation layer, a liquid crystal layer that contains liquid crystals which are horizontally aligned in a case where no voltage is applied, plural electrode pairs that generate a transverse electric field in the liquid crystal layer by a voltage being applied, a second substrate, a second linear polarizer, and a backlight. In a case where a color of light emitted from the backlight is expressed by using chromaticity coordinates (x, y) of an XYZ color system, both of x and y are 0.32 or greater.Type: GrantFiled: July 6, 2018Date of Patent: September 28, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Akira Sakai, Yuichi Kawahira, Koji Murata, Masahiro Hasegawa, Takako Koide, Kozo Nakamura, Kiyoshi Minoura
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Publication number: 20210286213Abstract: A liquid crystal display panel includes a first substrate, a second substrate, a liquid crystal layer, a first polarizing plate, and a second polarizing plate. The first substrate includes a first dielectric substrate, first and second electrodes, provided over the first dielectric substrate and configured to generate a transverse electric field in the liquid crystal layer, at least either of which has a plurality of slits, and a first alignment film placed in contact with the liquid crystal layer. The first substrate further includes an inorganic insulating layer provided between the second electrode and the first alignment film. The difference between the refractive index of the inorganic insulating layer and the refractive index of the second electrode is smaller than or equal to 0.20. The thickness of the inorganic insulating layer is greater than or equal to 50% of the thickness of the second electrode and greater than or equal to 40 nm.Type: ApplicationFiled: March 10, 2021Publication date: September 16, 2021Inventors: AKIRA SAKAI, MASAHIRO HASEGAWA, MIHO YAMADA, KOJI MURATA, KIYOSHI MINOURA
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Publication number: 20210251902Abstract: Provided is a composition comprising delamanid particles for which the formation of secondary particles is suppressed. Specifically, provided is a composition comprising (A) delamanid particles and (B) a surface stabilizer.Type: ApplicationFiled: June 11, 2019Publication date: August 19, 2021Applicant: OTSUKA PHARMACEUTICAL CO., LTD.Inventors: Atsuya NAKAMURA, Hiroyuki YAMAZAKI, Masahiro HASEGAWA, Naoki KAMADA
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Patent number: 11079626Abstract: A liquid crystal display device includes: a liquid crystal panel; a backlight; an illuminance sensor; and a display controller. The liquid crystal panel includes, in order toward the backlight, an antireflection layer, a first linearly polarizing plate, a first ?/4 retardation layer, a first substrate, a second ?/4 retardation layer, a liquid crystal layer, a second substrate, and a second linearly polarizing plate. The liquid crystal panel has a reflectance within a predetermined range in irradiating the liquid crystal panel with light from an antireflection layer side. The liquid crystal display device satisfies a predetermined relation in the following X and Y, where X (unit: lx) is defined as an environmental illuminance detected by the illuminance sensor, and Y (unit: nit) is defined as a luminance of the backlight, adjusted by the display controller.Type: GrantFiled: September 27, 2019Date of Patent: August 3, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Yuichi Kawahira, Koji Murata, Takako Koide, Masahiro Hasegawa, Akira Sakai, Kiyoshi Minoura
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Publication number: 20210215968Abstract: A liquid crystal display device of the present invention includes in the following order from a viewing surface side a first polarizer, a first positive A plate having an in-plane retardation of 120 nm or greater and 155 nm or smaller, a positive C plate having a thickness retardation of 80 nm or greater and 100 nm or smaller, a first substrate, a second positive A plate having an in-plane retardation of 120 nm or greater and 155 nm or smaller, a horizontally aligned liquid crystal layer, a second substrate, a viewing angle compensation layer, and a second polarizer. The device further includes between the first polarizer and the first positive A plate a positive C plate having a thickness retardation of 30 nm or greater and 80 nm or smaller.Type: ApplicationFiled: March 25, 2021Publication date: July 15, 2021Inventors: MASAHIRO HASEGAWA, AKIRA SAKAI, TAKAKO KOIDE, YUICHI KAWAHIRA, KOJI MURATA, KIYOSHI MINOURA
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Publication number: 20210132450Abstract: The present invention provides a liquid crystal display device of a transverse electric field mode that may inhibit internal reflection and realize proper black display to which coloring does not occur. The present invention provides a liquid crystal display device including a first linear polarizer, a first ?/4 retardation layer, a first substrate, a second ?/4 retardation layer configured with a different material from the first ?/4 retardation layer, a liquid crystal layer that contains liquid crystals which are horizontally aligned in a case where no voltage is applied, plural electrode pairs that generate a transverse electric field in the liquid crystal layer by a voltage being applied, a second substrate, a second linear polarizer, and a backlight. In a case where a color of light emitted from the backlight is expressed by using chromaticity coordinates (x, y) of an XYZ color system, both of x and y are 0.32 or greater.Type: ApplicationFiled: July 6, 2018Publication date: May 6, 2021Inventors: AKIRA SAKAI, YUICHI KAWAHIRA, KOJI MURATA, MASAHIRO HASEGAWA, TAKAKO KOIDE, KOZO NAKAMURA, KIYOSHI MINOURA
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Patent number: 10989954Abstract: A liquid crystal display device of the present invention includes in the following order from a viewing surface side a first polarizer, a first positive A plate having an in-plane retardation of 120 nm or greater and 155 nm or smaller, a positive C plate having a thickness retardation of 80 nm or greater and 100 nm or smaller, a first substrate, a second positive A plate having an in-plane retardation of 120 nm or greater and 155 nm or smaller, a horizontally aligned liquid crystal layer, a second substrate, a viewing angle compensation layer, and a second polarizer. The device further includes between the first polarizer and the first positive A plate a positive C plate having a thickness retardation of 30 nm or greater and 80 nm or smaller.Type: GrantFiled: September 26, 2019Date of Patent: April 27, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Masahiro Hasegawa, Akira Sakai, Takako Koide, Yuichi Kawahira, Koji Murata, Kiyoshi Minoura
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Patent number: 10983396Abstract: 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: GrantFiled: March 25, 2020Date of Patent: April 20, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Koji Murata, Akira Sakai, Yuichi Kawahira, Takako Koide, Masahiro Hasegawa, Kiyoshi Minoura
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Publication number: 20210109269Abstract: The present invention provides: (I) a display device including a display panel, a retardation layer, and a polarizer which are stacked in the stated order from a back surface side to a viewing surface side and integrated without an adhesive layer; and (II) a method for producing a display device including: forming a first alignment film on a display panel, applying a solution containing first polymerizable liquid crystal to the first alignment film, and curing the first polymerizable liquid crystal to produce a retardation layer; and forming a second alignment film on the retardation layer, applying a solution containing second polymerizable liquid crystal and a dichroic material to the second alignment film, and curing the second polymerizable liquid crystal to produce a polarizer.Type: ApplicationFiled: March 23, 2018Publication date: April 15, 2021Applicant: SHARP KABUSHIKI KAISHAInventors: AKIRA SAKAI, MASAHIRO HASEGAWA, ATSUSHI BAN, KOJI MURATA, YUICHI KAWAHIRA, KIYOSHI MINOURA, TAKAKO KOIDE, KOZO NAKAMURA
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Publication number: 20210103083Abstract: 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: ApplicationFiled: July 18, 2017Publication date: April 8, 2021Inventors: KOJI MURATA, AKIRA SAKAI, YUICHI KAWAHIRA, MASAHIRO HASEGAWA, TAKAKO KOIDE, KOZO NAKAMURA, KIYOSHI MINOURA
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Patent number: 10962839Abstract: 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: GrantFiled: November 28, 2018Date of Patent: March 30, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Yuichi Kawahira, Kiyoshi Minoura, Akira Sakai, Takako Koide, Masahiro Hasegawa, Koji Murata
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Patent number: 10948778Abstract: 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: GrantFiled: July 28, 2017Date of Patent: March 16, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Masahiro Hasegawa, Koji Murata, Yuichi Kawahira, Takako Koide, Kozo Nakamura, Akira Sakai, Kiyoshi Minoura
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Publication number: 20210048568Abstract: In order to make a step of forming an coated-type polarizer easier, provided is a display device including, from a lower layer, a TFT layer, a light-emitting layer, a sealing layer, and a polarization layer in this order, in which the polarization layer includes a polymerizable liquid crystal layer containing a polymerizable liquid crystal into which a dichroic pigment is mixed and an alignment film coming in contact with a portion of the polymerizable liquid crystal layer to align the polymerizable liquid crystal contained in the polymerizable liquid crystal layer with which the alignment film is in contact, and in a display region, a region in which the polymerizable liquid crystal layer and the alignment film of the polarization layer come into contact with each other is a polarization portion, and in a frame region surrounding the display region, a region in which the polymerizable liquid crystal layer and the alignment film of the polarization layer do not come in contact with each other is a black frType: ApplicationFiled: March 15, 2018Publication date: February 18, 2021Inventors: AKIRA SAKAI, MASAHIRO HASEGAWA
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Publication number: 20210028407Abstract: A display device including a light-emitting layer, a touch panel, a phase difference layer, and a linear polarizing layer, wherein the touch panel and the phase difference layer are provided between the light-emitting layer and the linear polarizing layer, the touch panel includes a touch panel base material and a touch panel electrode, the touch panel base material is formed from a resin film, a phase difference of the resin film is (?0/4)+?0 at reference wavelength ?0, the phase difference layer is formed from a polymerizable liquid crystal material, a phase difference ? of the phase difference layer is ?0 at reference wavelength ?0, and a slow axis of the resin film is orthogonal to a slow axis of the phase difference layer.Type: ApplicationFiled: March 29, 2018Publication date: January 28, 2021Inventors: AKIRA SAKAI, MASAHIRO HASEGAWA
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Patent number: 10890805Abstract: 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: GrantFiled: December 5, 2019Date of Patent: January 12, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Masahiro Hasegawa, Akira Sakai, Takako Koide, Yuichi Kawahira, Koji Murata, Kiyoshi Minoura