Patents by Inventor Eiji Kanda
Eiji Kanda 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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Publication number: 20230349806Abstract: A sample observation apparatus includes a transparent vessel that accommodates a medium containing a sample, a light source below the vessel to emit first illumination light toward an inside of the vessel, and a light-receiving member that receives scattered light being the first illumination light scattered by the medium. The light-receiving member includes a light-transmissive portion and a light-receiving portion and is located between the medium and the light source and overlapping the light source.Type: ApplicationFiled: July 14, 2021Publication date: November 2, 2023Inventor: Eiji KANDA
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Patent number: 10068527Abstract: A pixel includes five transistors and a capacitor. A first transistor controls current to be supplied to a light-emitting element. A second transistor is connected between a gate electrode of the first transistor and a first power supply. A third transistor is connected between the gate electrode of the first transistor and a second terminal of the first transistor. The capacitor is coupled between the third transistor and the second terminal of the first transistor. The fourth transistor is connected between the second terminal of the first transistor and a second power supply. The fifth transistor is connected between the second terminal of the third transistor and a signal line. The capacitor may be the only capacitor in the pixel, and the signal line may receive an initialization voltage and a gray scale data voltage.Type: GrantFiled: September 2, 2016Date of Patent: September 4, 2018Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya
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Patent number: 9917145Abstract: A light-emitting device includes a drive transistor for controlling the quantity of current supplied to a light-emitting element, a capacitor element electrically connected to a gate electrode of the drive transistor, and an electrical continuity portion for electrically connecting the drive transistor and the light-emitting element, these elements being disposed on a substrate. The electrical continuity portion is disposed on the side opposite to the capacitor element with the drive transistor disposed therebetween.Type: GrantFiled: May 27, 2016Date of Patent: March 13, 2018Assignee: SEIKO EPSON CORPORATIONInventors: Takehiko Kubota, Eiji Kanda, Ryoichi Nozawa
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Patent number: 9886903Abstract: The pixel circuit includes a light-emitting element, an optical sensor for detecting a luminance of light emitted from the light-emitting element, and a compensation control circuit which controls the amount of the current supplied to the light-emitting element on the basis of a detection result of the optical sensor and a second voltage applied in a second interval different from a first interval with a predetermined length in which the light-emitting element is allowed to constantly emit light with a luminance based on a first voltage, and includes a first control circuit and a second control circuit where the first control circuit controls a first current amount for enabling the light-emitting element to emit light and the second control circuit controls a second current amount supplied to the light-emitting element.Type: GrantFiled: December 8, 2015Date of Patent: February 6, 2018Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Seiki Takahashi, Takeshi Okuno, Eiji Kanda
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Patent number: 9824627Abstract: A display circuit includes a plurality of pixel circuits and a shared compensation transistor. Each pixel circuit includes a driving transistor to control light emission of a light emitter. The compensation transistor is to compensate the threshold voltages of the driving transistors of the pixel circuits.Type: GrantFiled: June 8, 2015Date of Patent: November 21, 2017Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Eiji Kanda, Masayuki Kumeta, Ryo Ishii
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Patent number: 9747841Abstract: An electro-optical device selects a detection target pixel independently and obtains correction data to perform a correction operation. Under a control of the electro-optical device, remaining pixels other than the detection target pixel emit light to display an image.Type: GrantFiled: May 15, 2014Date of Patent: August 29, 2017Assignee: Samsung Display Co., Ltd.Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda
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Patent number: 9633598Abstract: A method for driving a display device includes driving a first pixel circuit based on first and second fields of a frame, and driving a second pixel circuit based on first and second fields of the frame. The first field of the first pixel circuit overlaps the second field of the second pixel circuit. The second field of the first pixel circuit overlaps the first field of the second pixel circuit. Operations performed in the first field include storing a gray scale data voltage, and operations performed in the second field include supplying an amount of current to a light emitter based on the stored gray scale data voltage. The first and second pixel circuits are in adjacent rows of the display device.Type: GrantFiled: May 5, 2014Date of Patent: April 25, 2017Assignee: Samsung Display Co., Ltd.Inventors: Takeshi Okuno, Masayuki Kumeta, Eiji Kanda, Ryo Ishii, Naoaki Komiya
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Patent number: 9633592Abstract: A display device includes an acquiring circuit, a calculator, and a delay controller. The acquiring circuit acquires a gray scale voltage of a gray scale value of a pixel. The calculator calculates a first delay correction value based on a voltage currently retained on a data signal line to which the gray scale voltage is output and a gray scale voltage to be subsequently output to the data signal line. The delay controller determines a timing when the gray scale voltage is to be output to the data signal line based on the first delay correction value.Type: GrantFiled: October 1, 2014Date of Patent: April 25, 2017Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Masayuki Kumeta, Ryo Ishii, Takeshi Okuno, Eiji Kanda, Daisuke Kawae, Naoaki Komiya
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Pixel circuit having driving method for threshold compensation and display apparatus having the same
Patent number: 9633605Abstract: A pixel circuit includes a first path coupled to a gate of a driving transistor and a second path passing through a source and drain of the driving transistor. An initialization voltage of the driving transistor is set based on a gray scale data voltage carried along the first path. A voltage is stored in a capacitor coupled to the gate of the driving transistor based on the gray scale data voltage carried along the second path. The voltage stored in the capacitor is based on the gray scale data voltage, and may be compensated for variation in a threshold voltage of the driving transistor.Type: GrantFiled: June 30, 2014Date of Patent: April 25, 2017Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Ryo Ishii, Daisuke Kawae, Masayuki Kumeta, Eiji Kanda, Takeshi Okuno -
Patent number: 9633625Abstract: A pixel circuit includes a plurality of pixels. Each pixel includes a data storage capacitor to store a voltage for controlling a gray scale value based on an input data signal, a plurality of switch transistors connected in series between a data signal line and the data storage capacitor, and a plurality of connection transistors coupled to the pixels. The switch transistors have a gate electrode connected to a first gate control signal line. At least one connection transistor is connected between at least one node between the switch transistors of a first pixel and at least one node between the switch transistors of a second pixel adjacent to the first pixel. The at least one connection transistor includes a gate electrode connected to a second gate control signal line.Type: GrantFiled: May 21, 2014Date of Patent: April 25, 2017Assignee: Samsung Display Co., Ltd.Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya
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Patent number: 9613567Abstract: A display device includes a pixel circuit having a driving transistor for driving a light-emitting element based on a gradation voltage held by a holding capacitor. The display device performs a first writing of gradation data using a first initialization voltage and a second writing of the gradation data using a second initialization voltage.Type: GrantFiled: December 11, 2013Date of Patent: April 4, 2017Assignee: Samsung Display Co., Ltd.Inventors: Takeshi Okuno, Masayuki Kumeta, Eiji Kanda, Ryo Ishii, Naoaki Komiya
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Patent number: 9576530Abstract: An optoelectronic device includes a first transistor, a second transistor, and a control circuit. The first transistor is electrically connected between a power supply and a light-emitting element, has a gate to receive a gray scale voltage, and supplies the light-emitting element with a driving current corresponding to the gray scale voltage. The second transistor has a gate electrically connected to an electrode of the light-emitting element and a source or drain electrically connected to a circuit including a voltmeter. The control circuit reads a measurement value of the voltmeter when the gate of the first transistor receives the gray scale voltage, and corrects a next gray scale voltage applied to the gate of the first transistor based on the measurement value.Type: GrantFiled: August 26, 2014Date of Patent: February 21, 2017Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Eiji Kanda, Takeshi Okuno, Masayuki Kumeta, Daisuke Kawae, Ryo Ishii, Naoaki Komiya
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Patent number: 9576533Abstract: A display apparatus includes a display unit, a control unit, and a compensation unit. The compensation unit may compensate the display data when a sensing operation is performed on a target pixel circuit, the compensation unit compensating display data by setting a light emission amount of light emitting element of a target pixel circuit to be an amount obtained by subtracting a sensing light emission amount, which is a light emission amount of the light emitting element of the target pixel circuit during a sensing interval, from a display light emission amount, which is a light emission amount of the light emitting element of the target pixel circuit before the compensation.Type: GrantFiled: February 19, 2015Date of Patent: February 21, 2017Assignee: Samsung Display Co., Ltd.Inventors: Masayuki Kumeta, Ryo Ishii, Eiji Kanda, Naoaki Komiya
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Patent number: 9552766Abstract: An electroluminescence display device includes a controller which generates signals for controlling at least one pixel circuit during a first period and a second period. The controller controls current to a light-emitting element of the at least one pixel circuit based on a data voltage in the first period. The controller controls a supplying period of current to the light-emitting element based on a duty control voltage in the second period. The supplying period when the pixel circuit is driven at a first gray scale value is longer than that when the pixel circuit is driven at a second gray scale. The first gray scale value is greater than the second gray scale value.Type: GrantFiled: August 26, 2014Date of Patent: January 24, 2017Assignee: Samsung Display Co., Ltd.Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Daisuke Kawae
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Publication number: 20170004774Abstract: A pixel includes five transistors and a capacitor. A first transistor controls current to be supplied to a light-emitting element. A second transistor is connected between a gate electrode of the first transistor and a first power supply. A third transistor is connected between the gate electrode of the first transistor and a second terminal of the first transistor. The capacitor is coupled between the third transistor and the second terminal of the first transistor. The fourth transistor is connected between the second terminal of the first transistor and a second power supply. The fifth transistor is connected between the second terminal of the third transistor and a signal line. The capacitor may be the only capacitor in the pixel, and the signal line may receive an initialization voltage and a gray scale data voltage.Type: ApplicationFiled: September 2, 2016Publication date: January 5, 2017Inventors: Masayuki KUMETA, Takeshi OKUNO, Eiji KANDA, Ryo ISHII, Naoaki KOMIYA
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Patent number: 9514674Abstract: A display device includes a driving transistor in a pixel circuit. A signal line is connected to a source or drain of the driving transistor. The source or drain of the driving transistor receives a power source voltage, an initialization voltage, and a data voltage through the signal line during different periods of operation. The periods of operation include an emission and non-emission periods.Type: GrantFiled: April 16, 2014Date of Patent: December 6, 2016Assignee: Samsung Display Co., Ltd.Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya
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Patent number: 9472140Abstract: A device includes pixel circuits arranged in columns and rows, n data lines (n being an integer of 2 or more) for each column, gate lines supplied with scan signals, and light-emitting control lines supplied with light-emitting control signals. The pixel circuits are divided into n groups of rows, each group of rows being exclusively connected to a corresponding data line. Each pixel circuit includes a write control transistor to control writing a data voltage in response to a scan signal, a driving transistor to control the amount of current to be supplied to a current light-emitting element, a light-emitting control transistor to control supply of a current to the light-emitting element in response to a light-emitting control signal, a capacitor to retain a voltage corresponding to a write data voltage, and a reset transistor to set the gate electrode of the driving transistor with the initial voltage.Type: GrantFiled: October 15, 2014Date of Patent: October 18, 2016Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Eiji Kanda, Takeshi Okuno, Naoaki Komiya
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Publication number: 20160276423Abstract: A light-emitting device includes a drive transistor for controlling the quantity of current supplied to a light-emitting element, a capacitor element electrically connected to a gate electrode of the drive transistor, and an electrical continuity portion for electrically connecting the drive transistor and the light-emitting element, these elements being disposed on a substrate. The electrical continuity portion is disposed on the side opposite to the capacitor element with the drive transistor disposed therebetween.Type: ApplicationFiled: May 27, 2016Publication date: September 22, 2016Applicant: SEIKO EPSON CORPORATIONInventors: Takehiko KUBOTA, Eiji KANDA, Ryoichi NOZAWA
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Patent number: 9451677Abstract: A display device includes pixel circuits arranged in a matrix, each of the pixel circuits including: a light-emitting element; an optical sensor to detect luminance of light emitted from the light-emitting element; and a compensation control circuit including a first capacitor and a second capacitor, the first and second capacitors to maintain a second voltage applied to the compensation control circuit. The compensation control circuit controls the light-emitting element to constantly emit light having a luminance based on a first voltage during a first interval of a light emission interval. The compensation control circuit controls the amount of current supplied to the light-emitting element based on a detection result of the optical sensor and the second voltage maintained in the first and second capacitors during a second interval and a third interval of the light emission interval, respectively.Type: GrantFiled: December 7, 2015Date of Patent: September 20, 2016Assignee: Samsung Display Co., Ltd.Inventors: Seiki Takahashi, Takeshi Okuno, Eiji Kanda
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Patent number: 9437136Abstract: A pixel includes five transistors and a capacitor. A first transistor controls current to be supplied to a light-emitting element. A second transistor is connected between a gate electrode of the first transistor and a first power supply. A third transistor is connected between the gate electrode of the first transistor and a second terminal of the first transistor. The capacitor is coupled between the third transistor and the second terminal of the first transistor. The fourth transistor is connected between the second terminal of the first transistor and a second power supply. The fifth transistor is connected between the second terminal of the third transistor and a signal line. The capacitor may be the only capacitor in the pixel, and the signal line may receive an initialization voltage and a gray scale data voltage.Type: GrantFiled: July 1, 2014Date of Patent: September 6, 2016Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Masayuki Kumeta, Takeshi Okuno, Eiji Kanda, Ryo Ishii, Naoaki Komiya