Patents by Inventor Akira Yumoto
Akira Yumoto 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: 8120551Abstract: An active-matrix display device that employs current-programmed-type pixel circuits and performs the writing data to each of pixels on a line-by-line basis. The active-matrix display device has a matrix of current-programmed-type pixel circuits includes a data line driving circuit formed of a plurality of current driving circuits (CD) arranged so as to correspond to respective data lines. The data line driving circuit (CD) holds image data (luminance data herein) in the form of voltage, and then converts the voltage of the image data into a current signal. The current signal is then fed to the data lines at a time. The image information is thus written on the pixel circuits.Type: GrantFiled: January 24, 2006Date of Patent: February 21, 2012Assignee: Sony CorporationInventor: Akira Yumoto
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Patent number: 8080936Abstract: In a display device including, a display area having a plurality of organic EL devices on a substrate; a peripheral area having a driving circuit for the organic EL devices and surrounding the display area on the substrate; and an organic insulating film covering at least the driving circuit, the organic insulating film has a separating groove which divides itself into the inner part and outer part at the periphery of the display area.Type: GrantFiled: July 29, 2005Date of Patent: December 20, 2011Assignee: Sony CorporationInventors: Hiroshi Fujimura, Masumitsu Ino, Mitsuru Asano, Akira Yumoto, Yuichi Iwase
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Patent number: 7859495Abstract: Herein is disclosed an image display apparatus, including a pixel array section, and a peripheral circuit section. The pixel array section has a plurality of scanning lines extending along rows, a plurality of signal lines extending along columns, and a plurality of pixels disposed in a matrix at locations at which the scanning lines and the signal lines intersect with each other. The peripheral circuit section has a scanner and a driver. Each of the pixels contains a sampling transistor, a drive transistor, a switching transistor, and a light emitting element.Type: GrantFiled: May 17, 2007Date of Patent: December 28, 2010Assignee: Sony CorporationInventors: Mitsuru Asano, Junichi Yamashita, Akira Yumoto, Hiroshi Fujimura
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Patent number: 7825880Abstract: A pixel circuit is disposed where a scan line arranged in a row direction to supply a control signal and a data line arranged in a column direction to supply a video signal intersect each other. The pixel circuit includes: a sampling transistor; a drive transistor; a capacitor connected between the current path end of the sampling transistor and the gate of the drive transistor; and a light-emitting device connected to the current path end of the drive transistor. The pixel circuit connects the mobility with negative feedback during a mobility connection period.Type: GrantFiled: August 13, 2007Date of Patent: November 2, 2010Assignee: Sony CorporationInventors: Akira Yumoto, Mitsuru Asano, Seiichiro Jinta
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Publication number: 20100264410Abstract: A method for manufacturing a thin film transistor includes the steps of covering a gate electrode patterned on a substrate with a gate insulating film, forming an organic semiconductor layer and an electrode film on the gate insulating film in that lamination order, and forming a negative type photoresist film on the substrate provided with the organic semiconductor layer and the electrode film and forming a resist pattern, which serves as a mask for forming a source-drain by etching the electrode film, through back surface exposure from the substrate side by using the gate electrode as a light-shielding mask and the following development treatment.Type: ApplicationFiled: April 9, 2010Publication date: October 21, 2010Applicant: SONY CORPORATIONInventors: Kazumasa Nomoto, Mao Katsuhara, Akira Yumoto
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Patent number: 7808176Abstract: A display unit capable of preventing corrosion of a metal wiring and improving the reliability is provided. The display unit includes a driving panel having a bonding region and a terminal region on a driving substrate and a sealing panel bonded on the bonding region of the driving panel with an adhesive layer in between. The bonding region includes a circuit section, a coating layer covering the circuit section, and a display portion composed of a plurality of display devices. A plurality of metal wirings is electrically connected to the circuit section in the bonding region and extended to the terminal region. The coating layer has at least one separated region between the plurality of metal wirings.Type: GrantFiled: December 6, 2006Date of Patent: October 5, 2010Assignee: Sony CorporationInventors: Masayki Sakaguchi, Yasuhiro Kanaya, Toshiaki Yamaguchi, Shinji Kubota, Kazunari Takagi, Akira Yumoto
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Publication number: 20100176381Abstract: It is an object to provide a display device in which an operational characteristic in a bottom gate type organic semiconductor thin film transistor can be maintained to a stable characteristic without receiving an influence of an electrode provided on an upper layer thereof, and a display with a high reliability can be realized by using this as a driver element. A bottom gate type thin film transistor Tr provided on a substrate 1 and a pixel electrode a provided on an upper part of the thin film transistor Tr via a protection film 11 and an inter-layer insulating film 15 are provided, and between the thin film transistor Tr and the pixel electrode a, a conductive shield layer 13a is arranged while an insulation property is maintained between these.Type: ApplicationFiled: December 26, 2007Publication date: July 15, 2010Applicant: SONY CORPORATIONInventors: Iwao Yagi, Akira Yumoto
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Patent number: 7612745Abstract: When a current-writing type pixel circuit is made, it involves a greater number of transistors and TFTs occupy much of the area of the pixel circuit. To alleviate this problem, two pixel circuits (P1, P2) have a first scanning TFT (14), a current-voltage conversion TFT (16), respective second scanning TFTs (15-1, 15-2), capacitors (13-1, 13-2), and drive TFTs (12-1, 12-2) for OLED including organic EL elements (11-2, 11-2) of two pixels, for example, in a row direction. In each of the pixel circuits, the first scanning TFT (14) handling a large amount of current (Iw) as compare with current flowing through the OLED (11-2, 11-2), and the current-voltage conversion TFT (16) are shared between two pixels.Type: GrantFiled: December 30, 2005Date of Patent: November 3, 2009Assignee: Sony CorporationInventors: Akira Yumoto, Mitsuru Asano
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Publication number: 20090004729Abstract: A reaction device including: a plurality of reaction areas; and a plurality of heating parts configured to be each provided for a respective one of the reaction areas, wherein each of the heating parts includes: a heat source; a scan line for selecting the heating part; a data line that transmits heating amount information used for heating to the heat source; a writer that acquires the heating amount information transmitted from the data line; a holder that stores the heating amount information also after the scan line is turned to a non-selected state; and a heat generation controller that controls heat generation of the heat source based on the heating amount information.Type: ApplicationFiled: June 25, 2008Publication date: January 1, 2009Applicant: SONY CORPORATIONInventors: Toshiki Moriwaki, Akira Yumoto
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Patent number: 7432889Abstract: An active matrix type display apparatus of the present invention includes pixel circuits each having an electrooptic device that changes brightness thereof according to a current flowing therein and driving said electrooptic device on the basis of brightness data supplied via a data line, and a current type pixel driving circuit for supplying each of said pixel circuits with a writing current that temporally increases in magnitude of a current value thereof within a cycle of writing of said brightness data. In the matrix type display apparatus of the present invention, the magnitude of the current value of the writing current is temporally increased within the writing cycle, whereby the writing current is limited to a low level (or zero) in an early stage of the writing cycle. Thus, the average value of the writing current is reduced.Type: GrantFiled: May 23, 2002Date of Patent: October 7, 2008Assignee: Sony CorporationInventor: Akira Yumoto
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Patent number: 7420530Abstract: A pixel electrode and a display device capable of lowering power consumption with a uniformity of luminance retained, and realizing a display image having a high contrast and a high image quality, wherein a correction period for correcting a variation in properties of a drive transistor in a pixel during a frame, a write period for driving a first switch by a first control line and writing a data signal from a signal line to the node, and a drive period for storing the written data signal and driving an electro-optical element, are set, and the drive is controlled so that an interval having the correction period, the write period, and the drive period, and an interval having the write period and the drive period without the correction period exist.Type: GrantFiled: May 3, 2006Date of Patent: September 2, 2008Assignee: Sony CorporationInventors: Mitsuru Asano, Akira Yumoto, Hiroshi Fujimura
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Patent number: 7388564Abstract: A display device including a current drive circuit capable of stably and correctly supplying an intended current to a light emitting element of each pixel without being affected by variations in characteristics of an active element inside the pixel and as a result capable of displaying a high quality image, wherein each pixel comprises a receiving use transistor TFT3 for fetching a signal current Iw from a data line DATA when a scanning line SCAN-A is selected, a conversion use transistor TFT1 for once converting a current level of a fetched signal current Iw to a voltage level and holding the same, and a drive use transistor TFT2 for passing a drive current having a current level in accordance with the held voltage level through a light emitting element OLED. The conversion use thin film transistor TFT1 generates a converted voltage level at its own gate by passing the signal current Iw fetched by the TFT3 through its own channel. A capacitor C holds the voltage level created at the gate of the TFT1.Type: GrantFiled: April 14, 2005Date of Patent: June 17, 2008Assignee: Sony CorporationInventor: Akira Yumoto
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Patent number: 7379039Abstract: A display device including a current drive circuit capable of stably and correctly supplying an intended current to a light emitting element of each pixel without being affected by variations in characteristics of an active element inside the pixel and as a result capable of displaying a high quality image, wherein each pixel comprises a receiving use transistor TFT3 for fetching a signal current Iw from a data line DATA when a scanning line SCAN-A is selected, a conversion use transistor TFT1 for once converting a current level of a fetched signal current Iw to a voltage level and holding the same, and a drive use transistor TFT2 for passing a drive current having a current level in accordance with the held voltage level through a light emitting element OLED. The conversion use thin film transistor TFT1 generates a converted voltage level at its own gate by passing the signal current Iw fetched by the TFT3 through its own channel. A capacitor C holds the voltage level created at the gate of the TFT1.Type: GrantFiled: February 24, 2004Date of Patent: May 27, 2008Assignee: Sony CorporationInventor: Akira Yumoto
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Publication number: 20080048955Abstract: A pixel circuit is disposed where a scan line arranged in a row direction to supply a control signal and a data line arranged in a column direction to supply a video signal intersect each other. The pixel circuit includes: a sampling transistor; a drive transistor; a capacitor connected between the current path end of the sampling transistor and the gate of the drive transistor; and a light-emitting device connected to the current path end of the drive transistor. The pixel circuit connects the mobility with negative feedback during a mobility connection period.Type: ApplicationFiled: August 13, 2007Publication date: February 28, 2008Applicant: Sony CorporationInventors: Akira Yumoto, Mitsuru Asano, Seiichiro Jinta
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Publication number: 20080001861Abstract: Herein disclosed an image display apparatus, including a pixel array section, and a peripheral circuit section. The pixel array section has a plurality of scanning lines extending along rows, a plurality of signal lines extending along columns, and a plurality of pixels disposed in a matrix at locations at which the scanning lines and the signal lines intersect with each other. The peripheral circuit section has a scanner and a driver. Each of the pixels contains a sampling transistor, a drive transistor, a switching transistor, and a light emitting element.Type: ApplicationFiled: May 17, 2007Publication date: January 3, 2008Applicant: Sony CorporationInventors: Mitsuru Asano, Junichi Yamashita, Akira Yumoto, Hiroshi Fujimura
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Publication number: 20070273620Abstract: Herein disclosed an image display including: row scan lines configured to supply a control signal; column signal lines configured to supply a video signal; and pixel circuits configured to be disposed at intersections between the scan lines and the signal lines, wherein each of the pixel circuits has at least a drive transistor, a sampling transistor connected to a gate of the drive transistor, a capacitive part connected between the gate and a source of the drive transistor, and a light-emitting element connected to the source of the drive transistor.Type: ApplicationFiled: May 23, 2007Publication date: November 29, 2007Applicant: Sony CorporationInventor: Akira Yumoto
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Publication number: 20070153208Abstract: A display unit capable of preventing corrosion of a metal wiring and improving the reliability is provided. The display unit includes a driving panel having a bonding region and a terminal region on a driving substrate, and a sealing panel being bonded on the bonding region of the driving panel with an adhesive layer in between. The bonding region includes a circuit section, a coating layer covering a circuit section, and a display portion composed of a plurality of display devices. A plurality of metal wirings are electrically connected to the circuit section in the bonding region and are extended to the terminal region. The coating layer has at least one separated region between the plurality of metal wirings.Type: ApplicationFiled: December 6, 2006Publication date: July 5, 2007Applicant: Sony CorporationInventors: Masayuki Sakaguchi, Yasuhiro Kanaya, Toshiaki Yamaguchi, Shinji Kubota, Kazunari Takagi, Akira Yumoto
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Patent number: 7193591Abstract: A display device including a current drive circuit capable of stably and correctly supplying an intended current to a light emitting element of each pixel without being affected by variations in characteristics of an active element inside the pixel and as a result capable of displaying a high quality image, wherein each pixel comprises a receiving use transistor TFT3 for fetching a signal current Iw from a data line DATA when a scanning line SCAN-A is selected, a conversion use transistor TFT1 for once converting a current level of a fetched signal current Iw to a voltage level and holding the same, and a drive use transistor TFT2 for passing a drive current having a current level in accordance with the held voltage level through a light emitting element OLED. The conversion use thin film transistor TFT1 generates a converted voltage level at its own gate by passing the signal current Iw fetched by the TFT3 through its own channel. A capacitor C holds the voltage level created at the gate of the TFT1.Type: GrantFiled: April 14, 2005Date of Patent: March 20, 2007Assignee: Sony CorporationInventor: Akira Yumoto
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Publication number: 20060256058Abstract: A pixel electrode and a display device capable of lowering a power consumption with a uniformity of a luminance retained, and realizing a display image having a high contrast and a high image quality, wherein a correction period for correcting a variation of property of a drive transistor in a pixel during a frame, a write period for driving a first switch by a first control line and writing a data signal from a signal line to the node, and a drive period for storing the written data signal and driving a electro-optical element, are set, and the drive is controlled so that an interval having the correction period, the write period, and the drive period, and an interval having the write period and the drive period without the correction period exist.Type: ApplicationFiled: May 3, 2006Publication date: November 16, 2006Applicant: Sony CorporationInventors: Mitsuru Asano, Akira Yumoto, Hiroshi Fujimura
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Publication number: 20060170624Abstract: When a current-writing type pixel circuit is made, it involves a greater number of transistors and TFTs occupy much of the area of the pixel circuit. To alleviate this problem, two pixel circuits (P1, P2) have a first scanning TFT (14), a current-voltage conversion TFT (16), respective second scanning TFTs (15-1, 15-2), capacitors (13-1, 13-2), and drive TFTs (12-1, 12-2) for OLED including organic EL elements (11-2, 11-2) of two pixels, for example, in a row direction. In each of the pixel circuits, the first scanning TFT (14) handling a large amount of current (Iw) as compare with current flowing through the OLED (11-2, 11-2), and the current-voltage conversion TFT (16) are shared between two pixels.Type: ApplicationFiled: December 30, 2005Publication date: August 3, 2006Inventors: Akira Yumoto, Mitsuru Asano