Patents by Inventor Yoshifumi Ohta
Yoshifumi Ohta 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: 11903239Abstract: A display device includes the following: a base substrate; a light-emitting element on the base substrate with a TFT layer interposed therebetween, the light-emitting element forming a display region; a sealing film covering the light-emitting element and having a stack of, in sequence, first and second inorganic insulating films; a frame region surrounding the display region; a cut disposed in the frame region so as to partly cut the display region; a cut-peripheral wall disposed in the frame region between the display region and the cut, and extending along the boundary of the display region; an evaporated film between the cut-peripheral wall and the first inorganic insulating film; and an organic buffer layer disposed on a surface of the cut-peripheral wall and interposed between the first and second inorganic insulating films.Type: GrantFiled: September 27, 2018Date of Patent: February 13, 2024Assignee: SHARP KABUSHIKI KAISHAInventor: Yoshifumi Ohta
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Patent number: 11414741Abstract: A vapor deposition mask used to manufacture a display device includes a notch portion. The vapor deposition mask is provided with an FMM sheet and a first cover sheet. The first cover sheet includes a trunk portion and a notch forming portion that protrudes from the trunk portion and prevents film formation on the notch portion, and the thickness of at least a part of the notch forming portion is smaller than the thickness of the trunk portion.Type: GrantFiled: March 22, 2018Date of Patent: August 16, 2022Assignee: SHARP KABUSHIKI KAISHAInventors: Yoshifumi Ohta, Masao Nishiguchi
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Patent number: 11380871Abstract: A display device includes: a base substrate having a display area and a frame area, the display area to display an image, the frame area surrounding the display area; a light-emitting element in the display area; and a sealing film provided in the display area and the frame area so as to cover the light-emitting element, the sealing film including a first inorganic film, an organic film, and a second inorganic film, wherein the first inorganic film covers the light-emitting element, a third inorganic film is provided between the first inorganic film and the organic film, the third inorganic film having higher wettability for a liquid drop, the organic film on the first inorganic film covers the third inorganic film, and the second inorganic film covers the peripheral end portion of the first inorganic film and the organic film.Type: GrantFiled: February 26, 2018Date of Patent: July 5, 2022Assignee: SHARP KABUSHIKI KAISHAInventors: Yixin Yang, Yoshifumi Ohta, Jumpei Takahashi
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Patent number: 11329110Abstract: A display device includes: a base substrate; light-emitting elements on the base substrate with a TFT layers intervening between the light-emitting elements and the base substrate, to form a display area; a sealing film including a sequentially formed stack of a first inorganic film and a second inorganic film and provided so as to cover the light-emitting elements; and an insular non-display area in the display area, wherein the non-display area includes a frame-shaped inner circular wall protruding in a thickness direction of the base substrate and extending along a boundary between the non-display area and the display area, and the inner circular wall includes on a surface thereof an organic buffer layer interposed between the first inorganic film and the second inorganic film.Type: GrantFiled: December 27, 2017Date of Patent: May 10, 2022Assignee: SHARP KABUSHIKI KAISHAInventor: Yoshifumi Ohta
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Publication number: 20220029126Abstract: A display device includes the following: a base substrate; a light-emitting element on the base substrate with a TFT layer interposed therebetween, the light-emitting element forming a display region; a sealing film covering the light-emitting element and having a stack of, in sequence, first and second inorganic insulating films; a frame region surrounding the display region; a cut disposed in the frame region so as to partly cut the display region; a cut-peripheral wall disposed in the frame region between the display region and the cut, and extending along the boundary of the display region; an evaporated film between the cut-peripheral wall and the first inorganic insulating film; and an organic buffer layer disposed on a surface of the cut-peripheral wall and interposed between the first and second inorganic insulating films.Type: ApplicationFiled: September 27, 2018Publication date: January 27, 2022Inventor: YOSHIFUMI OHTA
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Patent number: 10991906Abstract: A display device includes a light-emitting element layer including a light-emitting element, a TFT layer formed in a lower layer than the light-emitting element layer and including a transistor configured to be used to drive the light-emitting element, and a sealing layer with which the light-emitting element layer is covered. The sealing layer includes a first inorganic sealing film and a second inorganic sealing film in an upper layer than the first inorganic sealing film, and an end face of the TFT layer is covered with the second inorganic sealing film.Type: GrantFiled: June 21, 2017Date of Patent: April 27, 2021Assignee: SHARP KABUSHIKI KAISHAInventor: Yoshifumi Ohta
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Publication number: 20210005841Abstract: A display device includes: a base substrate; tight-emitting elements on the base substrate with a TFT layers intervening between the tight-emitting elements and the base substrate, to form a display area; a sealing film including a sequentially formed stack of a first inorganic film and a second inorganic film and provided so as to cover the light-emitting elements; and an insular non-display area in the display area, wherein the non-display area includes a frame-shaped inner circular wall protruding in a thickness direction of the base substrate and extending along a boundary between the non-display area and the display area, and the inner circular wall includes on a surface thereof an organic buffer layer interposed between the first inorganic film and the second inorganic film.Type: ApplicationFiled: December 27, 2017Publication date: January 7, 2021Inventor: YOSHIFUMI OHTA
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Publication number: 20200411804Abstract: A vapor deposition mask used to manufacture a display device includes a notch portion. The vapor deposition mask is provided with an FMM sheet and a first cover sheet. The first cover sheet includes a trunk portion and a notch forming portion that protrudes from the trunk portion and prevents film formation on the notch portion, and the thickness of at least a part of the notch forming portion is smaller than the thickness of the trunk portion.Type: ApplicationFiled: March 22, 2018Publication date: December 31, 2020Inventors: YOSHIFUMI OHTA, MASAO NISHIGUCHI
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Publication number: 20200403182Abstract: A display device includes: a base substrate having a display area and a frame area, the display area to display an image, the frame area surrounding the display area; a light-emitting element in the display area; and a sealing film provided in the display area and the frame area so as to cover the light-emitting element, the sealing film including a first inorganic film, an organic film, and a second inorganic film, wherein the first inorganic film covers the light-emitting element, a third inorganic film is provided between the first inorganic film and the organic film, the third inorganic film having higher wettability for a liquid drop, the organic film on the first inorganic film covers the third inorganic film, and the second inorganic film covers the peripheral end portion of the first inorganic film and the organic film.Type: ApplicationFiled: February 26, 2018Publication date: December 24, 2020Inventors: YIXIN YANG, YOSHIFUMI OHTA, JUMPEI TAKAHASHI
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Publication number: 20200185644Abstract: A display device includes a light-emitting element layer including a light-emitting element, a TFT layer formed in a lower layer than the light-emitting element layer and including a transistor configured to be used to drive the light-emitting element, and a sealing layer with which the light-emitting element layer is covered. The sealing layer includes a first inorganic sealing film and a second inorganic sealing film in an upper layer than the first inorganic sealing film, and an end face of the TFT layer is covered with the second inorganic sealing film.Type: ApplicationFiled: June 21, 2017Publication date: June 11, 2020Inventor: Yoshifumi OHTA
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Patent number: 10497901Abstract: An organic EL display device 1 includes a flexible plastic substrate 10, an organic EL element 4 on the plastic substrate 10, and a sealing film 2 provided on the plastic substrate 10 to cover the organic EL element 4. The sealing film 2 includes a first sealing layer 25 on a surface of the plastic substrate 10, a stress relief layer 26 on a surface of the first sealing layer 25, and a second sealing layer 27 on a surface of the stress relief layer 26. Compressive stress of the first sealing layer 25 is lower than compressive stress of the second sealing layer 27.Type: GrantFiled: December 4, 2018Date of Patent: December 3, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Mamoru Ishida, Kazuhiko Tsuda, Yoshifumi Ohta
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Publication number: 20190363145Abstract: A base substrate, a OLED element, and a seal portion covering the OLED element are included. The seal portion includes a first sealing film including an inorganic film, a second sealing film including an organic film, a third sealing film including an inorganic film, and a coupling layer formed between the first sealing film and the second sealing film.Type: ApplicationFiled: January 26, 2017Publication date: November 28, 2019Inventors: Yoshifumi OHTA, Tohru SONODA
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Patent number: 10461270Abstract: An organic EL display device includes an organic EL display panel having a plastic substrate exhibiting flexibility and organic EL elements formed on the plastic substrate, a first inorganic layer provided on an upper surface of the organic EL display panel, and a second inorganic layer provided on a lower surface of the organic EL display panel. The entire thickness T of the organic EL display device is equal to or less than 74 ?m.Type: GrantFiled: March 22, 2017Date of Patent: October 29, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Mamoru Ishida, Yoshifumi Ohta, Takeshi Hirase, Takashi Ochi, Tohru Senoo, Tohru Sonoda
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Publication number: 20190109298Abstract: An organic EL display device 1 includes a flexible plastic substrate 10, an organic EL element 4 on the plastic substrate 10, and a sealing film 2 provided on the plastic substrate 10 to cover the organic EL element 4. The sealing film 2 includes a first sealing layer 25 on a surface of the plastic substrate 10, a stress relief layer 26 on a surface of the first sealing layer 25, and a second sealing layer 27 on a surface of the stress relief layer 26. Compressive stress of the first sealing layer 25 is lower than compressive stress of the second sealing layer 27.Type: ApplicationFiled: December 4, 2018Publication date: April 11, 2019Inventors: MAMORU ISHIDA, KAZUHIKO TSUDA, YOSHIFUMI OHTA
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Publication number: 20190088895Abstract: An organic EL display device includes an organic EL display panel having a plastic substrate exhibiting flexibility and organic EL elements formed on the plastic substrate, a first inorganic layer provided on an upper surface of the organic EL display panel, and a second inorganic layer provided on a lower surface of the organic EL display panel. The entire thickness T of the organic EL display device is equal to or less than 74 ?m.Type: ApplicationFiled: March 22, 2017Publication date: March 21, 2019Inventors: Mamoru ISHIDA, Yoshifumi OHTA, Takeshi HIRASE, Takashi OCHI, Tohru SENOO, Tohru SONODA
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Patent number: 10181580Abstract: An organic EL display device 1 includes a flexible plastic substrate 10, an organic EL element 4 on the plastic substrate 10, and to sealing film 2 provided on the plastic substrate 10 to cover the organic EL element 4. The sealing film 2 includes a first sealing layer 25 on a surface of the plastic substrate 10, a stress relief layer 26 on a surface of the first sealing layer 25, and a second sealing layer 27 on a surface of the stress relief layer 26. Compressive stress of the first sealing layer 25 is lower than compressive stress of the second sealing layer 27.Type: GrantFiled: December 4, 2015Date of Patent: January 15, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Mamoru Ishida, Kazuhiko Tsuda, Yoshifumi Ohta
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Patent number: 9953563Abstract: A data line drive circuit provides a voltage according to a detection voltage and to a reference voltage, between the gate and source of a drive transistor in a pixel circuit, and detects a drive current having passed through the drive transistor and outputted external to the pixel circuit. A threshold voltage correction memory stores, for each pixel circuit, data representing a threshold voltage of the drive transistor. A display control circuit controls the reference voltage based on the data stored in the threshold voltage correction memory. By this, even if the threshold voltage of the drive transistor is changed, the drive current can be detected with a high accuracy. The threshold voltage correction memory may store, for each pixel circuit, data representing a difference between the threshold voltage of the drive transistor and the reference voltage.Type: GrantFiled: March 4, 2014Date of Patent: April 24, 2018Assignee: SHARP KABUSHIKI KAISHAInventors: Noritaka Kishi, Hiromitsu Katsui, Noboru Noguchi, Masanori Ohara, Shigetsugu Yamanaka, Yoshifumi Ohta
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Publication number: 20170338442Abstract: An organic EL display device 1 includes a flexible plastic substrate 10, an organic EL element 4 on the plastic substrate 10, and to sealing film 2 provided on the plastic substrate 10 to cover the organic EL element 4. The sealing film 2 includes a first sealing layer 25 on a surface of the plastic substrate 10, a stress relief layer 26 on a surface of the first sealing layer 25, and a second sealing layer 27 on a surface of the stress relief layer 26. Compressive stress of the first sealing layer 25 is lower than compressive stress of the second sealing layer 27.Type: ApplicationFiled: December 4, 2015Publication date: November 23, 2017Inventors: MAMORU ISHIDA, KAZUHIKO TSUDA, YOSHIFUMI OHTA
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Patent number: 9818373Abstract: A unit equivalent value acquiring unit acquires a normal-temperature unit equivalent use time ?tn by using a temperature sensor, first to third LUTs, and a first multiplying unit. An integration unit acquires an equivalent cumulative use time to by integrating the normal-temperature unit equivalent use time ?tn. A maximum value detecting unit detects a maximum equivalent cumulative use time tnmax. A dividing unit acquires a correction coefficient Kcmp by dividing total degradation E(tnmax,Tn) acquired by a fourth LUT by total degradation E(tn,Tn) acquired by a fifth LUT. Accordingly, there is provided a data processing device for a display device capable of preventing burn-in while suppressing time degradation of an electro-optical element and increase in the number of wires.Type: GrantFiled: October 24, 2013Date of Patent: November 14, 2017Assignee: Sharp Kabushiki KaishaInventors: Yoshifumi Ohta, Kengo Takahama
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Patent number: 9495894Abstract: An embodiment of the present invention is directed to reducing a memory capacity required for saving compensating data (data used for compensating variations and the like in characteristic of a drive transistor) compared to conventional examples, in a display device. An organic EL display device using an oxide TFT for a drive transistor is provided with: a low pass filter for extracting low frequency component data from pixel current data as data of a drive current of the drive transistor; a first computing portion for obtaining high frequency component data by obtaining a difference between the pixel current data and the low frequency component data; a down-sampling portion for extracting data from the low frequency component data at predetermined sampling intervals; and a high frequency signal compression processing portion for extracting only high amplitude data out of the high frequency component data.Type: GrantFiled: December 25, 2013Date of Patent: November 15, 2016Assignee: SHARP KABUSHIKI KAISHAInventors: Shigetsugu Yamanaka, Shinji Nakagawa, Hiroyuki Furukawa, Yoshifumi Ohta