Patents by Inventor Kazuo TAKIZAWA
Kazuo TAKIZAWA 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: 10614757Abstract: An organic EL panel 10 is a bendable display panel including a plurality of pixel circuits 60 each having a light emitting element and a drive element. A data line drive circuit 15 performs, by driving data lines, an operation of writing a voltage to a control terminal of the drive element and an operation of measuring a current flowing through the drive element for the pixel circuits 60 selected by a scanning line drive circuit 14. A bending detection unit 90 detects a bending state of the organic EL panel 10 based on a measurement result of the current flowing through the drive element. A correction unit 80 corrects a video signal VS1 based on the detected bending state. With this, the bending state of a screen is detected and a change in brightness or color when the screen is bent is prevented.Type: GrantFiled: November 25, 2016Date of Patent: April 7, 2020Assignee: SHARP KABUSHIKI KAISHAInventors: Kazuo Takizawa, Noritaka Kishi, Naoko Gotoh, Hideki Uchida, Katsuhiro Kikuchi
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Patent number: 10311791Abstract: The purpose of the present invention is to suppress the fluctuation of a data line voltage that occurs when an analog voltage signal is sampled and held in a data line in a display device provided with a current-driven display element. Transistors (SWr, SWG, SWb) of each demultiplexer (252) are successively switched on, for each predetermined period, in a selection period of a write control line (SW_LR(i)). In a period when the transistor (SWr) is switched on, an analog video signal (Dj) from a data voltage output unit circuit (211d) is applied to a data line (SLrj) and a pixel circuit (50r). When the transistor SWr is then switched off, the voltage held by the data line (SLrj) decreases below the voltage of the analog video signal (Dj) due to a parasitic capacitance (Cssdr). However, the voltage of a voltage fluctuation compensation line (G3_Cnt (i)) changes from a low level to a high level within the selection period.Type: GrantFiled: June 29, 2016Date of Patent: June 4, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Masanori Ohara, Hideki Uchida, Katsuhiro Kikuchi, Satoshi Inoue, Yuto Tsukamoto, Eiji Koike, Kazuo Takizawa, Noboru Noguchi, Noritaka Kishi
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Patent number: 10304385Abstract: An object of the present invention is to implement a display device capable of compensating for degradation of circuit elements without causing a grayscale failure. Based on the results of detection of characteristics of drive transistors and organic EL elements, a control circuit (20) finds magnitudes of threshold shifts of the drive transistors and the organic EL elements. A power supply voltage control unit (201) sets a value of a low-level power supply voltage (ELVSS) to a value lower, by a voltage value corresponding to an average value of the magnitudes of the threshold shifts for all pixels, than a value at an initial point in time. Furthermore, the power supply voltage control unit (201) adjusts a value of a high-level power supply voltage (ELVDD), depending on magnitudes of mobilities obtained by detection of characteristics of the drive transistors.Type: GrantFiled: July 23, 2018Date of Patent: May 28, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Kazuo Takizawa, Noritaka Kishi
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Publication number: 20190057649Abstract: An organic EL panel 10 is a bendable display panel including a plurality of pixel circuits 60 each having a light emitting element and a drive element. A data line drive circuit 15 performs, by driving data lines, an operation of writing a voltage to a control terminal of the drive element and an operation of measuring a current flowing through the drive element for the pixel circuits 60 selected by a scanning line drive circuit 14. A bending detection unit 90 detects a bending state of the organic EL panel 10 based on a measurement result of the current flowing through the drive element. A correction unit 80 corrects a video signal VS1 based on the detected bending state. With this, the bending state of a screen is detected and a change in brightness or color when the screen is bent is prevented.Type: ApplicationFiled: November 25, 2016Publication date: February 21, 2019Inventors: Kazuo TAKIZAWA, Noritaka KISHI, Naoko GOTOH, Hideki UCHIDA, Katsuhiro KIKUCHI
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Publication number: 20190012948Abstract: In each of pixel circuits in an organic EL display device configured to display color images in a field sequential method, a drive transistor is connected to first to third organic EL elements configured to emit red light, green light, and blue light through first to third light emission control transistors. A connection point between the drive transistor and the light emission control transistors is connected to a data line through a monitor control transistors. A data-side driving circuit is provided with a data voltage output unit circuit and a current measurement unit circuit for each of data lines. The data-side driving circuit is configured to be able to switch between the unit circuits to connect either one of the unit circuits to the data line.Type: ApplicationFiled: December 22, 2016Publication date: January 10, 2019Inventors: Masanori OHARA, Hideki UCHIDA, Katsuhiro KIKUCHI, Yuto TSUKAMOTO, Eiji KOIKE, Kazuo TAKIZAWA, Noboru NOGUCHI, Noritaka KISHI, Asae ITO, Yoshiyuki ISOMURA
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Publication number: 20180350301Abstract: An object of the present invention is to implement a display device capable of compensating for degradation of circuit elements without causing a grayscale failure. Based on the results of detection of characteristics of drive transistors and organic EL elements, a control circuit (20) finds magnitudes of threshold shifts of the drive transistors and the organic EL elements. A power supply voltage control unit (201) sets a value of a low-level power supply voltage (ELVSS) to a value lower, by a voltage value corresponding to an average value of the magnitudes of the threshold shifts for all pixels, than a value at an initial point in time. Furthermore, the power supply voltage control unit (201) adjusts a value of a high-level power supply voltage (ELVDD), depending on magnitudes of mobilities obtained by detection of characteristics of the drive transistors.Type: ApplicationFiled: July 23, 2018Publication date: December 6, 2018Inventors: KAZUO TAKIZAWA, NORITAKA KISHI
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Patent number: 10090467Abstract: A magnetic material section is provided on a mask substrate so as to be interposed between Y aperture lines of the mask substrate and between X aperture line of the mask substrate. A portion of the magnetic material section which portion is interposed between the X aperture lines has a first thickness and a second thickness which is less than the first thickness, the first thickness being that of each sub-portion thereof which is positioned between mutually adjacent ones of the Y aperture lines, the second thickness being that of each sub-portion thereof which is positioned between apertures which are mutually adjacent in a Y direction.Type: GrantFiled: October 15, 2015Date of Patent: October 2, 2018Assignee: SHARP KABUSHIKI KAISHAInventors: Shinichi Kawato, Manabu Niboshi, Yuhki Kobayashi, Kazuo Takizawa
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Patent number: 10062326Abstract: Based on the results of detection of characteristics of drive transistors and organic EL elements, a control circuit finds magnitudes of threshold shifts of the drive transistors and the organic EL elements. A power supply voltage control unit sets a value of a low-level power supply voltage to a value lower, by a voltage value corresponding to an average value of the magnitudes of the threshold shifts for all pixels, than a value at an initial point in time. Furthermore, the power supply voltage control unit adjusts a value of a high-level power supply voltage, depending on magnitudes of mobilities obtained by detection of characteristics of the drive transistors.Type: GrantFiled: March 24, 2015Date of Patent: August 28, 2018Assignee: SHARP KABUSHIKI KAISHAInventors: Kazuo Takizawa, Noritaka Kishi
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Publication number: 20180174507Abstract: The purpose of the present invention is to suppress the fluctuation of a data line voltage that occurs when an analog voltage signal is sampled and held in a data line in a display device provided with a current-driven display element. Transistors (SWr, SWG, SWb) of each demultiplexer (252) are successively switched on, for each predetermined period, in a selection period of a write control line (SW_LR(i)). In a period when the transistor (SWr) is switched on, an analog video signal (Dj) from a data voltage output unit circuit (211d) is applied to a data line (SLrj) and a pixel circuit (50r). When the transistor SWr is then switched off, the voltage held by the data line (SLrj) decreases below the voltage of the analog video signal (Dj) due to a parasitic capacitance (Cssdr). However, the voltage of a voltage fluctuation compensation line (G3_Cnt (i)) changes from a low level to a high level within the selection period.Type: ApplicationFiled: June 29, 2016Publication date: June 21, 2018Inventors: Masanori OHARA, Hideki UCHIDA, Katsuhiro KIKUCHI, Satoshi INOUE, Yuto TSUKAMOTO, Eiji KOIKE, Kazuo TAKIZAWA, Noboru NOGUCHI, Noritaka KISHI
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Patent number: 9975133Abstract: In plan view, a magnet plate (10) has a first magnetic domain (11) and a second magnetic domain (12), a magnetic domain boundary line (14) is inclined to an opening side (26) and is bent or curved, and the magnet plate has magnetic fields that are generated in a respective plurality of different directions.Type: GrantFiled: January 27, 2016Date of Patent: May 22, 2018Assignee: SHARP KABUSHIKI KAISHAInventors: Yuhki Kobayashi, Shinichi Kawato, Manabu Niboshi, Kazuo Takizawa
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Publication number: 20180119268Abstract: A vapor deposition device (1) includes: a vapor deposition source (30); a vapor deposition mask (10) having a plurality of mask openings (12); and a limiting plate unit (20) having a plurality of limiting plates (22). The limiting plate unit is configured such that, in a cross section parallel to an X axis direction, (i) the limiting plate unit includes at least one limiting plate opening (23), each of which is formed between the limiting plates and opposite to a respective one of at least one target region (202) of a target substrate (200) such that the at least one limiting plate opening and the at least one target region are in one-to-one correspondence and (ii) the limiting plate unit prevents entry into the mask openings by vapor deposition particles (310) whose angle of entry is less than a shadow critical angle.Type: ApplicationFiled: April 15, 2016Publication date: May 3, 2018Inventors: Shinichi KAWATO, Yuhki KOBAYASHI, Kazuo TAKIZAWA
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Publication number: 20180015493Abstract: In plan view, a magnet plate (10) has a first magnetic domain (11) and a second magnetic domain (12), a magnetic domain boundary line (14) is inclined to an opening side (26) and is bent or curved, and the magnet plate has magnetic fields that are generated in a respective plurality of different directions.Type: ApplicationFiled: January 27, 2016Publication date: January 18, 2018Inventors: YUHKI KOBAYASHI, SHINICHI KAWATO, MANABU NIBOSHI, KAZUO TAKIZAWA
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Publication number: 20180002803Abstract: The present invention is directed to a method for manufacturing a vapor deposition mask (2) which includes a mask section (3) and a mask frame (4). The mask section (3) includes an alloy containing iron and nickel. The method includes a heat treatment step of carrying out heat treatment with respect to the mask section (3) in a state in which end parts of the mask section (3) are fixed to the mask frame (4) while tension is applied to the mask section (3).Type: ApplicationFiled: December 28, 2015Publication date: January 4, 2018Applicant: Sharp Kabushiki KaishaInventors: MANABU NIBOSHI, SHINICHI KAWATO, YUHKI KOBAYASHI, KAZUO TAKIZAWA
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Publication number: 20170362698Abstract: A vapor deposition mask (10) has a fine-irregularities structure (14), provided on a contact surface of the vapor deposition mask (10), which is configured to attract, by van der Waals force, a film formation target substrate (30) so as to surround a plurality of apertures (12). The contact surface makes contact with the film formation target substrate (30).Type: ApplicationFiled: November 26, 2015Publication date: December 21, 2017Inventors: Yuhki KOBAYASHI, Shinichi KAWATO, Manabu NIBOSHI, Kazuo TAKIZAWA
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Publication number: 20170311411Abstract: A method of producing a vapor deposition mask includes the steps of (i) preparing a mixture which contains a resin material and an inorganic filler and (ii) shaping, with use of a reactor which serves as a shaping die, the mixture so that the mask substrate is shaped, the mask substrate containing a resin made of the resin material and the inorganic filler mixed in the resin.Type: ApplicationFiled: October 16, 2015Publication date: October 26, 2017Applicant: Sharp Kabushiki KaishaInventors: Kazuo TAKIZAWA, Shinichi KAWATO, Manabu NIBOSHI, Yuhki KOBAYASHI
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Publication number: 20170244035Abstract: A magnetic material section is provided on a mask substrate so as to be interposed between Y aperture lines of the mask substrate and between X aperture line of the mask substrate. A portion of the magnetic material section which portion is interposed between the X aperture lines has a first thickness and a second thickness which is less than the first thickness, the first thickness being that of each sub-portion thereof which is positioned between mutually adjacent ones of the Y aperture lines, the second thickness being that of each sub-portion thereof which is positioned between apertures which are mutually adjacent in a Y direction.Type: ApplicationFiled: October 15, 2015Publication date: August 24, 2017Applicant: SHARP KABUSHIKI KAISHAInventors: Shinichi KAWATO, Manabu NIBOSHI, Yuhki KOBAYASHI, Kazuo TAKIZAWA
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Publication number: 20170025061Abstract: Based on the results of detection of characteristics of drive transistors and organic EL elements, a control circuit finds magnitudes of threshold shifts of the drive transistors and the organic EL elements. A power supply voltage control unit sets a value of a low-level power supply voltage to a value lower, by a voltage value corresponding to an average value of the magnitudes of the threshold shifts for all pixels, than a value at an initial point in time. Furthermore, the power supply voltage control unit adjusts a value of a high-level power supply voltage, depending on magnitudes of mobilities obtained by detection of characteristics of the drive transistors.Type: ApplicationFiled: March 24, 2015Publication date: January 26, 2017Applicant: Sharp Kabushiki KaishaInventors: Kazuo TAKIZAWA, Noritaka KISHI