Patents by Inventor Yasushi Tomioka
Yasushi Tomioka 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: 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: 20220214215Abstract: An optical sensor includes at least one interferometer having a pair of semi-transparent mirrors spaced apart and oppositely arranged, and at least one position of the pair of semi-transparent mirrors can be displaced, at least one collimating element overlapping the at least one interferometer, and at least one photoelectric conversion element having sensitivity in the visible and near infrared light bands and receiving light passing through the interferometer and the collimating element.Type: ApplicationFiled: March 24, 2022Publication date: July 7, 2022Applicant: Japan Display Inc.Inventors: Toshiyuki HIGANO, Yasushi TOMIOKA, Kazuhiro NISHIYAMA
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Publication number: 20220151086Abstract: According to one embodiment, a display device includes a first submodule having a display panel, a second submodule having a cover member located on the display panel, and a first decoupling layer located between the first submodule and the second submodule, and each of the first submodule and the second submodule has a single neutral plane.Type: ApplicationFiled: January 27, 2022Publication date: May 12, 2022Applicant: Japan Display Inc.Inventors: Hajime YAMAGUCHI, Yasushi TOMIOKA
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Publication number: 20220146889Abstract: According to one embodiment, a liquid crystal optical element includes a substrate having a first surface, a plurality of structures disposed on the first surface and arranged at a predetermined pitch, and a liquid crystal layer surrounding each of the structures and interposed between the structures adjacent to each other. The liquid crystal layer has a larger thickness than the structure. The liquid crystal layer has liquid crystal molecules arranged along the structure, and is cured in a state in which an alignment direction of the liquid crystal molecules is fixed.Type: ApplicationFiled: November 1, 2021Publication date: May 12, 2022Applicant: Japan Display Inc.Inventors: Junji KOBASHI, Shinichiro OKA, Yasushi TOMIOKA, Koichi IGETA
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Patent number: 11275274Abstract: The present invention prevents the shaving of an alignment film caused by a columnar spacer in a liquid crystal display device of an IPS method using photo-alignment. A plinth higher than a pixel electrode is formed at a part where a columnar spacer formed over a counter substrate touches a TFT substrate. When an alignment film of a double-layered structure is applied over the pixel electrode and the plinth, the thickness of the alignment film over the plinth reduces by a leveling effect. When photo-alignment is applied in the state, a photodegraded upper alignment film over the plinth disappears and a lower alignment film having a high mechanical strength remains. As a result, it is possible to prevent the shaving of the alignment film.Type: GrantFiled: October 22, 2020Date of Patent: March 15, 2022Assignee: Japan Display Inc.Inventors: Noboru Kunimatsu, Masaki Matsumori, Hidehiro Sonoda, Yasushi Tomioka, Toshiki Kaneko
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Patent number: 11277926Abstract: According to one embodiment, a display device includes a first submodule having a display panel, a second submodule having a cover member located on the display panel, and a first decoupling layer located between the first submodule and the second submodule, and each of the first submodule and the second submodule has a single neutral plane.Type: GrantFiled: June 10, 2020Date of Patent: March 15, 2022Assignee: JAPAN DISPLAY INC.Inventors: Hajime Yamaguchi, Yasushi Tomioka
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Publication number: 20220058365Abstract: According to an aspect, a detection device includes a plurality of light-receiving elements configured to receive light, and a light guide portion one surface of which faces the light-receiving elements. The light guide portion includes a plurality of light guide paths provided throughout from the one surface to the other surface of the light guide portion, and a light-absorbing portion having higher absorbance of the light than that of the light guide paths. When viewed from a direction in which the light-receiving elements and the light guide portion are stacked, more than one of the light guide paths overlap one of the light-receiving elements.Type: ApplicationFiled: November 2, 2021Publication date: February 24, 2022Inventors: Yasushi TOMIOKA, Kazuki MATSUNAGA, Toshiyuki HIGANO, Kazuhiro NISHIYAMA
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Publication number: 20220039697Abstract: A detection device includes: an optical sensor including a sensor base member and photoelectric conversion elements that are provided on the sensor base member and configured to output signals corresponding to light emitted to the photoelectric conversion elements; a light-emitting element configured to emit output light toward a direction of an object to be measured; and an optical element including first light-transmitting areas and a non-light-transmitting area and provided between the optical sensor and the object to be measured.Type: ApplicationFiled: October 27, 2021Publication date: February 10, 2022Applicant: Japan Display Inc.Inventors: Toshiyuki HIGANO, Kazuhiro NISHIYAMA, Yasushi TOMIOKA, Genki ASOZU, Kazuki MATSUNAGA
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Publication number: 20220026753Abstract: A liquid crystal display device comprising a TFT substrate having pixels each including a common electrode formed on an organic passivation film, an interlayer insulating film formed so as to cover the common electrode, a pixel electrode having a slit and formed on the interlayer insulating film, a through-hole formed in the organic passivation film and the interlayer insulating film, and a source electrode electrically conducted to the pixel electrode via the through-hole. A taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees. The pixel electrode covers part of a side wall of the through-hole but does not cover the remaining part of the side wall of the through-hole. This configuration facilitates the alignment film material to flow into the through-hole, thereby solving a thickness unevenness of the alignment film in vicinity of the through-hole.Type: ApplicationFiled: October 13, 2021Publication date: January 27, 2022Inventors: Yasushi TOMIOKA, Toshimasa ISHIGAKI, Hidehiro SONODA, Sumito UETA
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Publication number: 20220004064Abstract: In a liquid crystal display device, a common electrode is formed on an organic passivation film, an interlayer insulating film is formed on the common electrode, a pixel electrode with a slit is formed on the interlayer insulating film, and a through hole is formed in the organic passivation film and the interlayer insulating film, so that the pixel electrode is connected to a source electrode of a TFT through the through hole. Further, the taper angle around the upper base of the through hole is smaller than the taper angle around the lower base. Thus, the alignment film material can easily flow into the through hole when the diameter of the through hole is reduced to connect the pixel and source electrodes, preventing display defects such as uneven brightness due to the absence of the alignment film or due to the alignment film irregularity around the through hole.Type: ApplicationFiled: September 15, 2021Publication date: January 6, 2022Inventors: Yasushi TOMIOKA, Yosuke HYODO, Hidehiro SONODA, Noboru KUNIMATSU
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Publication number: 20220004061Abstract: A liquid crystal display device includes a TFT substrate having a first alignment film and an opposing substrate having a second alignment film with liquid crystals sandwiched therebetween. One of the first and second alignment films, comprises a first polyimide produced via polyamide acid ester containing cyclobutane as a precursor and a second polyimide produced via polyamide acid as a precursor. The polyamide acid has a higher polarity than that of the polyamide acid ester. The one of the first and second alignment films is responsive to photo-alignment. A first side of the one of the first and second alignment films is adjacent to the liquid crystals, and a second side thereof is closer to one of the TFT substrate and the counter substrate than the first side. The first side contains more of the first polyimide and less of the second polyimide than the second side.Type: ApplicationFiled: September 17, 2021Publication date: January 6, 2022Inventors: Noboru KUNIMATSU, Chikae MATSUI, Hidehiro SONODA, Yuko MATSUMOTO, Shoichi UCHINO, Masaki MATSUMORI, Yasushi TOMIOKA
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Patent number: 11187936Abstract: Regarding a flexible display apparatus, a technique capable of securing connection performance between the members in the thickness direction and reducing the change of the cell gap, and besides, achieving favorable optical property such as the improvement of the aperture ratio is provided. A display apparatus 1 includes: a first substrate SB1 having flexibility; a second substrate SB2 having flexibility; a liquid crystal layer LQ serving as an electrooptic layer; and a display area made of these components. The second substrate SB2 includes: a color filter (second color filter CF2) arranged in a region corresponding to an opening P1 of each pixel in the display area in a plan view; and a first light blocking film BM1 having an ultraviolet-light transmitting property and arranged in a region corresponding to a non-opening P2 between pixels.Type: GrantFiled: July 22, 2020Date of Patent: November 30, 2021Assignee: Japan Display Inc.Inventors: Shinichiro Oka, Yosuke Hyodo, Lu Jin, Yasushi Tomioka
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Patent number: 11175546Abstract: A liquid crystal display device comprising a TFT substrate having pixels each including a common electrode formed on an organic passivation film, an interlayer insulating film formed so as to cover the common electrode, a pixel electrode having a slit and formed on the interlayer insulating film, a through-hole formed in the organic passivation film and the interlayer insulating film, and a source electrode electrically conducted to the pixel electrode via the through-hole. A taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees. The pixel electrode covers part of a side wall of the through-hole but does not cover the remaining part of the side wall of the through-hole. This configuration facilitates the alignment film material to flow into the through-hole, thereby solving a thickness unevenness of the alignment film in vicinity of the through-hole.Type: GrantFiled: November 23, 2020Date of Patent: November 16, 2021Assignee: Japan Display Inc.Inventors: Yasushi Tomioka, Toshimasa Ishigaki, Hidehiro Sonoda, Sumito Ueta
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Patent number: 11156875Abstract: A liquid crystal display device includes a TFT substrate having a first alignment film and an opposing substrate having a second alignment film with liquid crystals sandwiched therebetween. One of the first and second alignment films, comprises a first polyimide produced via polyamide acid ester containing cyclobutane as a precursor and a second polyimide produced via polyamide acid as a precursor. The polyamide acid has a higher polarity than that of the polyamide acid ester. The one of the first and second alignment films is responsive to photo-alignment. A first side of the one of the first and second alignment films is adjacent to the liquid crystals, and a second side thereof is closer to one of the TFT substrate and the counter substrate than the first side. The first side contains more of the first polyimide and less of the second polyimide than the second side.Type: GrantFiled: December 5, 2019Date of Patent: October 26, 2021Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Noboru Kunimatsu, Chikae Matsui, Hidehiro Sonoda, Yuko Matsumoto, Shoichi Uchino, Masaki Matsumori, Yasushi Tomioka
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Patent number: 11150523Abstract: In a liquid crystal display device, a common electrode is formed on an organic passivation film, an interlayer insulating film is formed on the common electrode, a pixel electrode with a slit is formed on the interlayer insulating film, and a through hole is formed in the organic passivation film and the interlayer insulating film, so that the pixel electrode is connected to a source electrode of a TFT through the through hole. Further, the taper angle around the upper base of the through hole is smaller than the taper angle around the lower base. Thus, the alignment film material can easily flow into the through hole when the diameter of the through hole is reduced to connect the pixel and source electrodes, preventing display defects such as uneven brightness due to the absence of the alignment film or due to the alignment film irregularity around the through hole.Type: GrantFiled: November 20, 2020Date of Patent: October 19, 2021Assignee: Japan Display Inc.Inventors: Yasushi Tomioka, Yosuke Hyodo, Hidehiro Sonoda, Noboru Kunimatsu
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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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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: 20210072603Abstract: In a liquid crystal display device, a common electrode is formed on an organic passivation film, an interlayer insulating film is formed on the common electrode, a pixel electrode with a slit is formed on the interlayer insulating film, and a through hole is formed in the organic passivation film and the interlayer insulating film, so that the pixel electrode is connected to a source electrode of a TFT through the through hole. Further, the taper angle around the upper base of the through hole is smaller than the taper angle around the lower base. Thus, the alignment film material can easily flow into the through hole when the diameter of the through hole is reduced to connect the pixel and source electrodes, preventing display defects such as uneven brightness due to the absence of the alignment film or due to the alignment film irregularity around the through hole.Type: ApplicationFiled: November 20, 2020Publication date: March 11, 2021Inventors: Yasushi TOMIOKA, Yosuke HYODO, Hidehiro SONODA, Noboru KUNIMATSU
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Publication number: 20210074795Abstract: According to one embodiment, a display device including, a substrate including a first area including a display area, a second area including a mount area, and a third area located between the first area and the second area, a first inorganic insulating layer provided on the substrate in the first area and the second area, a line provided on the first inorganic insulating layer and extending across the first area, the second area, and the third area, and, a second inorganic insulating layer provided on the line, the second inorganic insulating layer extending to an area overlaid on at least the first inorganic insulating layer.Type: ApplicationFiled: November 20, 2020Publication date: March 11, 2021Applicant: Japan Display Inc.Inventor: Yasushi TOMIOKA