Patents by Inventor Takenori HIROTA
Takenori HIROTA 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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Patent number: 11852923Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.Type: GrantFiled: March 3, 2022Date of Patent: December 26, 2023Assignee: Japan Display Inc.Inventors: Takenori Hirota, Yasuhiro Kanaya, Hidehiro Sonoda, Toshiki Kaneko
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Publication number: 20220315703Abstract: According to one embodiment, a varnish for a photo alignment film includes an imidization promotor and a first polyamic acid-based compound in an organic solvent. The first polyamic acid-based compound is a polyamic acid or a polyamic acid ester. The imidization promotor has skeleton containing no primary amino group and no secondary amino group. The first polyamic acid-based compound has terminal skeletons containing no primary amino group.Type: ApplicationFiled: June 17, 2022Publication date: October 6, 2022Applicant: Japan Display Inc.Inventors: Hidehiro SONODA, Takenori Hirota, Yasushi Tomioka, Noboru Kunimatsu
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Patent number: 11384204Abstract: According to one embodiment, a varnish for a photo alignment film includes an imidization promotor and a first polyamic acid-based compound in an organic solvent. The first polyamic acid-based compound is a polyamic acid or a polyamic acid ester. The imidization promotor has skeleton containing no primary amino group and no secondary amino group. The first polyamic acid-based compound has terminal skeletons containing no primary amino group.Type: GrantFiled: February 2, 2021Date of Patent: July 12, 2022Assignee: Japan Display Inc.Inventors: Hidehiro Sonoda, Takenori Hirota, Yasushi Tomioka, Noboru Kunimatsu
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Publication number: 20220187641Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.Type: ApplicationFiled: March 3, 2022Publication date: June 16, 2022Inventors: Takenori HIROTA, Yasuhiro KANAYA, Hidehiro SONODA, Toshiki KANEKO
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Patent number: 11300835Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.Type: GrantFiled: July 24, 2020Date of Patent: April 12, 2022Assignee: Japan Display Inc.Inventors: Takenori Hirota, Yasuhiro Kanaya, Hidehiro Sonoda, Toshiki Kaneko
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Patent number: 11294244Abstract: According to one embodiment, an electro-optic device includes an electro-optic panel including a transparent base, a sealing portion provided in a peripheral area of the transparent base, a liquid crystal composition sealed by the transparent base and the sealing portion, an injection port for the liquid crystal composition provided in the peripheral area of the transparent base, and a light source arranged opposed to a side surface of the transparent base. The transparent base has a first side and a second side on an opposite side to the first side, the light source is opposed to the first side, and the injection port is opposed to the second side.Type: GrantFiled: December 11, 2020Date of Patent: April 5, 2022Assignee: Japan Display Inc.Inventors: Nobuko Fukuoka, Takenori Hirota
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Patent number: 11036088Abstract: According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate disposed to oppose the first substrate, a layer of liquid crystal located between the first substrate and the second substrate, and an alignment film disposed on the first substrate so as to be in contact with the layer of the liquid crystal. The liquid crystal has a refractive-index anisotropy ?n of 0.11 or more, the layer of the liquid crystal has a thickness d of 2.5 ?m or less, and a product ?nd of the refractive-index anisotropy ?n and the thickness d is 0.20 or more but 0.31 or less. The transmissivity of light having a wavelength of 450 nm in the first substrate and the alignment film is 85% or more but 97% or less.Type: GrantFiled: September 27, 2018Date of Patent: June 15, 2021Assignee: Japan Display Inc.Inventors: Hidehiro Sonoda, Masahiro Kosuge, Yasushi Tomioka, Takenori Hirota, Noboru Kunimatsu
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Publication number: 20210155755Abstract: According to one embodiment, a varnish for a photo alignment film includes an imidization promotor and a first polyamic acid-based compound in an organic solvent. The first polyamic acid-based compound is a polyamic acid or a polyamic acid ester. The imidization promotor has skeleton containing no primary amino group and no secondary amino group. The first polyamic acid-based compound has terminal skeletons containing no primary amino group.Type: ApplicationFiled: February 2, 2021Publication date: May 27, 2021Applicant: Japan Display Inc.Inventors: Hidehiro Sonoda, Takenori Hirota, Yasushi Tomioka, Noboru Kunimatsu
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Publication number: 20210096407Abstract: According to one embodiment, an electro-optic device includes an electro-optic panel including a transparent base, a sealing portion provided in a peripheral area of the transparent base, a liquid crystal composition sealed by the transparent base and the sealing portion, an injection port for the liquid crystal composition provided in the peripheral area of the transparent base, and a light source arranged opposed to a side surface of the transparent base. The transparent base has a first side and a second side on an opposite side to the first side, the light source is opposed to the first side, and the injection port is opposed to the second side.Type: ApplicationFiled: December 11, 2020Publication date: April 1, 2021Inventors: Nobuko FUKUOKA, Takenori HIROTA
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Patent number: 10947345Abstract: According to one embodiment, a varnish for a photo alignment film includes an imidization promotor and a first polyamic acid-based compound in an organic solvent. The first polyamic acid-based compound is a polyamic acid or a polyamic acid ester. The imidization promotor has skeleton containing no primary amino group and no secondary amino group. The first polyamic acid-based compound has terminal skeletons containing no primary amino group.Type: GrantFiled: July 12, 2017Date of Patent: March 16, 2021Assignee: Japan Display Inc.Inventors: Hidehiro Sonoda, Takenori Hirota, Yasushi Tomioka, Noboru Kunimatsu
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Publication number: 20200393726Abstract: According to one embodiment, a liquid crystal display device includes a first substrate including a first area and a second area, a second substrate opposing the first substrate but not opposing the second area, a sealing part which adheres the first substrate and the second substrate to each other, a liquid crystal layer located between the first substrate and the second substrate and surrounded by the sealing part, an alignment film disposed on the first substrate so as to be in contact with the liquid crystal layer and a terminal located in the second area and connected to an external circuit. In plan view, the alignment film includes an end located between the sealing part and the terminal.Type: ApplicationFiled: September 1, 2020Publication date: December 17, 2020Applicant: Japan Display Inc.Inventors: Hidehiro Sonoda, Takenori Hirota, Noboru Kunimatsu, Koichi Igeta
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Publication number: 20200355949Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.Type: ApplicationFiled: July 24, 2020Publication date: November 12, 2020Inventors: Takenori HIROTA, Yasuhiro KANAYA, Hidehiro SONODA, Toshiki KANEKO
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Patent number: 10795211Abstract: According to one embodiment, a liquid crystal display device includes a first substrate including a first area and a second area, a second substrate opposing the first substrate but not opposing the second area, a sealing part which adheres the first substrate and the second substrate to each other, a liquid crystal layer located between the first substrate and the second substrate and surrounded by the sealing part, an alignment film disposed on the first substrate so as to be in contact with the liquid crystal layer and a terminal located in the second area and connected to an external circuit. In plan view, the alignment film includes an end located between the sealing part and the terminal.Type: GrantFiled: April 10, 2018Date of Patent: October 6, 2020Assignee: Japan Display Inc.Inventors: Hidehiro Sonoda, Takenori Hirota, Noboru Kunimatsu, Koichi Igeta
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Patent number: 10761380Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.Type: GrantFiled: April 3, 2019Date of Patent: September 1, 2020Assignee: Japan Display Inc.Inventors: Takenori Hirota, Yasuhiro Kanaya, Hidehiro Sonoda, Toshiki Kaneko
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Patent number: 10585511Abstract: A display device includes: a substrate (first substrate); a substrate (second substrate); a pixel electrode on the first substrate; a common electrode on the first substrate; a signal line existing on the first substrate and extending in a Y direction (first direction); a drive electrode (first electrode) existing on the second substrate and extending in the Y direction; a detection electrode (second electrode) existing on the second substrate and over the drive electrode, extending in an X direction (second direction) intersecting with the Y direction, and electrically connected to a detection circuit. Additionally, the drive electrode intersects with the detection electrode and overlaps the signal line.Type: GrantFiled: February 13, 2018Date of Patent: March 10, 2020Assignee: Japan Display Inc.Inventor: Takenori Hirota
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Patent number: 10573264Abstract: According to one embodiment, a display device comprises first and second substrates and a liquid crystal layer. The first substrate includes a pixel electrode and a common electrode. The second substrate is opposed to the first substrate. The liquid crystal layer is between the first substrate and the second substrate. A frame frequency for rewriting a voltage of the pixel electrode is 80 Hz or more. A liquid crystal material contained in the liquid crystal layer has negative dielectric anisotropy. Product ?nd of a gap d between the first substrate and the second substrate and refractive anisotropy ?n of the liquid crystal material is less than 0.33 ?m. The gap d is more than 2 ?m and less than 3 ?m.Type: GrantFiled: September 7, 2018Date of Patent: February 25, 2020Assignee: Japan Display Inc.Inventors: Takenori Hirota, Jin Hirosawa, Hidemasa Yamaguchi, Yasuhiro Takahashi
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Publication number: 20190227359Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.Type: ApplicationFiled: April 3, 2019Publication date: July 25, 2019Inventors: Takenori HIROTA, Yasuhiro KANAYA, Hidehiro SONODA, Toshiki KANEKO
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Patent number: 10288945Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.Type: GrantFiled: November 8, 2017Date of Patent: May 14, 2019Assignee: Japan Display Inc.Inventors: Takenori Hirota, Yasuhiro Kanaya, Hidehiro Sonoda, Toshiki Kaneko
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Patent number: 10281771Abstract: In a liquid crystal display device having an alignment film subjected to an optical alignment process, the frame area can be reduced while maintaining the reliability of the sealing portion. To achieve this, in the display area, the alignment process is performed with UV light on the alignment film, to form an area in which the alignment film is not formed in the opposing first and second sides, and to form an area in which the amount of UV light irradiation on the alignment film is one fourth or less of the display area in the opposing third and fourth sides. In the first and second sides, the sealing material overlaps the area in which the alignment film is not formed. In the third and fourth sides, the sealing material overlaps the area in which the amount of UV light irradiation is one fourth or less of the display area.Type: GrantFiled: May 3, 2016Date of Patent: May 7, 2019Assignee: Japan Display Inc.Inventors: Hidehiro Sonoda, Noboru Kunimatsu, Takenori Hirota, Yosuke Hyodo, Yasuo Imanishi, Yasushi Tomioka
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Publication number: 20190094627Abstract: According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate disposed to oppose the first substrate, a layer of liquid crystal located between the first substrate and the second substrate, and an alignment film disposed on the first substrate so as to be in contact with the layer of the liquid crystal. The liquid crystal has a refractive-index anisotropy ?n of 0.11 or more, the layer of the liquid crystal has a thickness d of 2.5 ?m or less, and a product ?nd of the refractive-index anisotropy ?n and the thickness d is 0.20 or more but 0.31 or less. The transmissivity of light having a wavelength of 450 nm in the first substrate and the alignment film is 85% or more but 97% or less.Type: ApplicationFiled: September 27, 2018Publication date: March 28, 2019Applicant: Japan Display Inc.Inventors: Hidehiro SONODA, Masahiro KOSUGE, Yasushi TOMOKA, Takenori HIROTA, Noboru KUNIMATSU