Patents by Inventor Kenichi Iwamoto
Kenichi Iwamoto 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: 11947216Abstract: A backlight apparatus includes a light source emitting blue light, a light guide layer, a quantum dot phosphor layer, a reflective layer, and a yellow phosphor layer. The light guide layer includes a first main surface, a second main surface, at least one light-receiving side surface, and at least one non-light-receiving side surface. The quantum dot phosphor layer is provided on the first main surface side of the light guide layer and includes a red quantum dot phosphor and a green quantum dot phosphor. The reflective layer is disposed on the second main surface side of the light guide layer. The yellow phosphor layer is provided between the second main surface and the reflective layer and in a region along the at least one non-light-receiving side surface, and includes a yellow phosphor. The quantum dot phosphor layer is in contact with the first main surface.Type: GrantFiled: June 2, 2023Date of Patent: April 2, 2024Assignee: Sharp Display Technology CorporationInventors: Kenichi Iwamoto, Satsuki Hagihara, Kazuhiko Negoro
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Publication number: 20230393431Abstract: A backlight apparatus includes a light source emitting blue light, a light guide layer, a quantum dot phosphor layer, a reflective layer, and a yellow phosphor layer. The light guide layer includes a first main surface, a second main surface, at least one light-receiving side surface, and at least one non-light-receiving side surface. The quantum dot phosphor layer is provided on the first main surface side of the light guide layer and includes a red quantum dot phosphor and a green quantum dot phosphor. The reflective layer is disposed on the second main surface side of the light guide layer. The yellow phosphor layer is provided between the second main surface and the reflective layer and in a region along the at least one non-light-receiving side surface, and includes a yellow phosphor. The quantum dot phosphor layer is in contact with the first main surface.Type: ApplicationFiled: June 2, 2023Publication date: December 7, 2023Inventors: Kenichi IWAMOTO, Satsuki HAGIHARA, Kazuhiko NEGORO
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Patent number: 11561433Abstract: A liquid crystal display device (100) according to the present invention is provided with a liquid crystal display panel (10) and a backlight device (50) which emits light toward the back surface (10r) of the liquid crystal display panel. The backlight device comprises: an LED substrate (21) that has a front surface (21s) on which a plurality of LED chips (22) are arranged so as to emit excitation light toward the back surface of the liquid crystal display panel; a phosphor layer (25) which contains a phosphor (25q) that emits fluorescent light upon reception of the excitation light; a wavelength selective reflection layer (28) which is arranged between the phosphor layer and the LED substrate, and wherein the transmittance of the excitation light is higher than the transmittance of the fluorescent light; and an optical layer laminate (30) which is arranged on the liquid crystal display panel side of the phosphor layer.Type: GrantFiled: June 22, 2018Date of Patent: January 24, 2023Assignee: SAKAI DISPLAY PRODUCTS CORPORATIONInventors: Kenichi Iwamoto, Mayumi Hori, Kazuhiko Negoro
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Patent number: 11287698Abstract: A liquid crystal display apparatus includes a liquid crystal display panel and a backlight device disposed on a rear face of the liquid crystal display panel. The backlight device includes a chassis, a plurality of LED units being disposed on the chassis and arranged in at least one direction, and a cooling structure thermally coupled to rear faces of the plurality of LED units. The cooling structure includes a plurality of enclosed spaces, each of the plurality of enclosed spaces containing a coolant in which a liquid phase and a gas phase coexist at room temperature. Each of the plurality of enclosed spaces is disposed correspondingly to at least one LED unit among the plurality of LED units arranged in the at least one direction.Type: GrantFiled: September 25, 2018Date of Patent: March 29, 2022Assignee: SAKAI DISPLAY PRODUCTS CORPORATIONInventors: Mayumi Hori, Kazuhiko Negoro, Kenichi Iwamoto, Akira Toyama, Makoto Noda
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Publication number: 20220004060Abstract: A liquid crystal display apparatus includes a liquid crystal display panel and a backlight device disposed on a rear face of the liquid crystal display panel. The backlight device includes a chassis, a plurality of LED units being disposed on the chassis and arranged in at least one direction, and a cooling structure thermally coupled to rear faces of the plurality of LED units. The cooling structure includes a plurality of enclosed spaces, each of the plurality of enclosed spaces containing a coolant in which a liquid phase and a gas phase coexist at room temperature. Each of the plurality of enclosed spaces is disposed correspondingly to at least one LED unit among the plurality of LED units arranged in the at least one direction.Type: ApplicationFiled: September 25, 2018Publication date: January 6, 2022Inventors: MAYUMI HORI, KAZUHIKO NEGORO, KENICHI IWAMOTO, AKIRA TOYAMA, MAKOTO NODA
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Publication number: 20210271135Abstract: A liquid crystal display device (100) according to the present invention is provided with a liquid crystal display panel (10) and a backlight device (50) which emits light toward the back surface (10r) of the liquid crystal display panel. The backlight device comprises: an LED substrate (21) that has a front surface (21s) on which a plurality of LED chips (22) are arranged so as to emit excitation light toward the back surface of the liquid crystal display panel; a phosphor layer (25) which contains a phosphor (25q) that emits fluorescent light upon reception of the excitation light; a wavelength selective reflection layer (28) which is arranged between the phosphor layer and the LED substrate, and wherein the transmittance of the excitation light is higher than the transmittance of the fluorescent light; and an optical layer laminate (30) which is arranged on the liquid crystal display panel side of the phosphor layer.Type: ApplicationFiled: June 22, 2018Publication date: September 2, 2021Inventors: KENICHI IWAMOTO, MAYUMI HORI, KAZUHIKO NEGORO
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Patent number: 11009746Abstract: A backlight device includes an LED substrate including LED devices arrayed and a quantum dot layer disposed to receive light output from the LED devices. Each LED device emits first blue light and at least one of first green light and first red light, and when relative radiance of the first blue light is 1.00, relative radiance of the first green light is 0.21 or less and relative radiance of the first red light is 0.48 or less. The quantum dot layer includes, in accordance with the at least one of the first green light and the first red light, at least one of a green quantum dot excited by the first blue light and emitting second green light and a red green quantum dot excited by the first blue light and emitting second red light, and the quantum dot layer contains 300 ppm or less of cadmium.Type: GrantFiled: October 19, 2020Date of Patent: May 18, 2021Assignee: SHARP KABUSHIKI KAISHAInventors: Kenichi Iwamoto, Mayumi Hori, Satsuki Kawai
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Publication number: 20210116751Abstract: A backlight device includes an LED substrate including LED devices arrayed and a quantum dot layer disposed to receive light output from the LED devices. Each LED device emits first blue light and at least one of first green light and first red light, and when relative radiance of the first blue light is 1.00, relative radiance of the first green light is 0.21 or less and relative radiance of the first red light is 0.48 or less. The quantum dot layer includes, in accordance with the at least one of the first green light and the first red light, at least one of a green quantum dot excited by the first blue light and emitting second green light and a red green quantum dot excited by the first blue light and emitting second red light, and the quantum dot layer contains 300 ppm or less of cadmium.Type: ApplicationFiled: October 19, 2020Publication date: April 22, 2021Inventors: KENICHI IWAMOTO, MAYUMI HORI, SATSUKI KAWAI
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Publication number: 20190196270Abstract: Provided is a display apparatus in which the occurrence of color nonuniformity can be prevented or reduced. A display apparatus in which light from a light source unit is transmitted through a fluorescent film before reaching a display panel, includes an optical path changing member provided between the light source unit and the fluorescent film and for changing optical path lengths within the fluorescent film of the light rays entering the fluorescent film from an incident surface of the fluorescent film.Type: ApplicationFiled: May 6, 2016Publication date: June 27, 2019Inventors: MAYUMI HORI, KENICHI IWAMOTO
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Patent number: 8482680Abstract: In a power board, relay terminals penetrate a circuit board through fitting holes, and are connected to output terminals. The fitting holes are thus formed as through holes on the circuit board, and thereby on-board connectors provided for connection to the relay terminals on a chassis can be arranged on the back surface of the circuit board on the opposite side of the chassis. Electronic components free from restriction of the positional relationship with the chassis can be mounted on the back surface of the circuit board, as are the on-board connectors.Type: GrantFiled: May 24, 2007Date of Patent: July 9, 2013Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, LimitedInventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo, Naofumi Ikenaga
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Patent number: 8405295Abstract: In a discharge tube, a conductive ferrule is provided on an end portion of a glass tube. The ferrule includes a body that is to be mounted to the outer circumference of the glass tube and has a contact portion to be electrically conductively fixed to a relay connector (or a bearing device). Further included is a conductive portion that extends from the body so as to have elastic contact with an outer lead. The outer lead will not be under load due to the weight of the discharge tube, but the conductive portion solely has elastic contact therewith. Thus, stress concentration on the outer lead can be prevented.Type: GrantFiled: December 18, 2009Date of Patent: March 26, 2013Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, LimitedInventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo
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Patent number: 8319901Abstract: Discharge tubes, each of which includes a glass tube and a ferrule that has a substantially cylindrical shape and is fitted to each end portion of the glass tube, are supported by a plurality of pairs of relay connectors (or supporting members) provided on the front side of a chassis having substantially a plate-shaped configuration. When a discharge tube is supported by relay connectors, stoppers provided on the relay connectors lock the ferrules so that axial movement of the discharge tube relative to the relay connectors is restricted.Type: GrantFiled: June 4, 2007Date of Patent: November 27, 2012Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, LimitedInventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo, Naofumi Ikenaga
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Patent number: 8297770Abstract: Discharge tubes, each of which includes a glass tube and a ferrule that has a substantially cylindrical shape and is fitted to each end portion of the glass tube, are supported by a plurality of pairs of relay connectors (or supporting members) provided on the front side of a chassis having substantially a plate-shaped configuration. When a discharge tube is supported by relay connectors, stoppers provided on the relay connectors lock the ferrules so that axial movement of the discharge tube relative to the relay connectors is restricted.Type: GrantFiled: December 23, 2009Date of Patent: October 30, 2012Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, Ltd.Inventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo, Naofumi Ikenaga
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Patent number: 8284154Abstract: In a discharge tube, a conductive ferrule is provided on an end portion of a glass tube. The ferrule includes a body that is to be mounted to the outer circumference of the glass tube and has a contact portion to be electrically conductively fixed to a relay connector (or a bearing device). Further included is a conductive portion that extends from the body so as to have elastic contact with an outer lead. The outer lead will not be under load due to the weight of the discharge tube, but the conductive portion solely has elastic contact therewith. Thus, stress concentration on the outer lead can be prevented.Type: GrantFiled: April 28, 2010Date of Patent: October 9, 2012Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, LimitedInventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo
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Patent number: 8220954Abstract: In a discharge tube, a conductive ferrule is provided on an end portion of a glass tube. The ferrule includes a body that is to be mounted to the outer circumference of the glass tube and has a contact portion to be electrically conductively fixed to a relay connector (or a bearing device). Further included is a conductive portion that extends from the body so as to have elastic contact with an outer lead. The outer lead will not be under load due to the weight of the discharge tube, but the conductive portion solely has elastic contact therewith. Thus, stress concentration on the outer lead can be prevented.Type: GrantFiled: May 24, 2007Date of Patent: July 17, 2012Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, LimitedInventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo
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Publication number: 20120154692Abstract: A lighting device includes a hot cathode tube (17) and a chassis (14) housing the hot cathode tube (17). The discharge tube includes an exposed portion that is exposed to the outside of the chassis (14). The lighting device further includes an inverter board (26) configured to supply driving power to the hot cathode tube (17). The hot cathode tube (17) has an a glass tube (17a) and a ferrule (17b) which is electrically connected to the inverter board (26), and the exposed portion of the hot cathode tube (17) is the ferrule (17B).Type: ApplicationFiled: July 12, 2010Publication date: June 21, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Yasumori Kuromizu, Kenichi Iwamoto, Kiyoshi Kakuda, Mayumi Nakamura
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Patent number: 8169158Abstract: A cold cathode tube lighting device prevents emission-position-dependent unevenness from occurring in the brightness of light emitted from the cold cathode tube lighting device and includes a plurality of discharge tubes connected in parallel; ballast capacitors each integrally attached to a respective one of the plurality of discharge tubes; power supplies arranged to supply power to the plurality of discharge tubes; and a voltage detection unit connected to the plurality of discharge tubes to detect voltages between pairs of internal electrodes of the plurality of discharge tubes. The power supply to the plurality of discharge tubes is controlled according to the voltages detected by the voltage detection unit.Type: GrantFiled: January 24, 2008Date of Patent: May 1, 2012Assignee: Sharp Kabushiki KaishaInventor: Kenichi Iwamoto
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Patent number: 8134286Abstract: In a discharge tube, a conductive ferrule is provided on an end portion of a glass tube. The ferrule includes a body that is to be mounted to the outer circumference of the glass tube and has a contact portion to be electrically conductively fixed to a relay connector (or a bearing device). Further included is a conductive portion that extends from the body so as to have elastic contact with an outer lead. The outer lead will not be under load due to the weight of the discharge tube, but the conductive portion solely has elastic contact therewith. Thus, stress concentration on the outer lead can be prevented.Type: GrantFiled: January 23, 2009Date of Patent: March 13, 2012Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, LimitedInventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo
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Patent number: 8118446Abstract: Discharge tubes, each of which includes a glass tube and a ferrule that has a substantially cylindrical shape and is fitted to each end portion of the glass tube, are supported by a plurality of pairs of relay connectors (or supporting members) provided on the front side of a chassis having substantially a plate-shaped configuration. When a discharge tube is supported by relay connectors, stoppers provided on the relay connectors lock the ferrules so that axial movement of the discharge tube relative to the relay connectors is restricted.Type: GrantFiled: February 18, 2010Date of Patent: February 21, 2012Assignees: Sharp Kabushiki Kaisha, Japan Aviation Electronics Industry, LimitedInventors: Yoshiki Takata, Kenichi Iwamoto, Takaaki Kudo, Naofumi Ikenaga
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Patent number: 8057055Abstract: A light source holding structure eliminates non-uniformity of temperature distribution of a tube body of a light source in order to make uniform the amount of light emitted or prevent portions at which the amount of light emitted is locally lowered. The light source holding structure has a linear light source and a first light source holding member substantially in the shape of a bar. An engaging groove arranged to engage with a portion of a tube body of the light source is provided on the front side of the first light source holding member. The portion of the tube body is engaged in the engaging groove and substantially the entire length of the tube body is brought into surface contact with the inner surface of the engaging groove.Type: GrantFiled: June 6, 2007Date of Patent: November 15, 2011Assignee: Sharp Kabushiki KaishaInventor: Kenichi Iwamoto