Patents by Inventor Tetsuro Yamamoto

Tetsuro Yamamoto 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).

  • Patent number: 8581807
    Abstract: Disclosed herein is a display device including a pixel array section having pixel circuits arranged in a form of a matrix, the pixel circuits each including a driving transistor for generating a driving current, an electrooptic element connected to an output terminal of the driving transistor, a storage capacitor for retaining information corresponding to signal amplitude of a video signal, and a sampling transistor for writing the information corresponding to the signal amplitude to the storage capacitor; a vertical scanning section configured to generate a vertical scanning pulse for vertical scanning of the pixel circuits; a horizontal scanning section configured to supply the video signal to the pixel circuits so as to coincide with the vertical scanning in the vertical scanning section; and a driving signal constancy achieving circuit for holding the driving current constant.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: November 12, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8581889
    Abstract: A display unit with which diffraction reflection is able to be decreased is provided. The display unit includes a display section having an organic EL device and a pixel circuit for every pixel. The pixel circuit has a first transistor for writing a video signal and a second transistor for driving the organic EL device based on the video signal written by the first transistor. The second transistor has a gate, a source and a drain. The organic EL device has an anode, an organic layer, and a cathode. An upper face of the source or the drain is formed at least in a region opposed to the anode or the cathode.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: November 12, 2013
    Assignee: Sony Corporation
    Inventors: Takayuki Taneda, Tetsuro Yamamoto, Katsuhide Uchino, Yuki Seo
  • Patent number: 8580903
    Abstract: The aim is to provide a flame retardant for thermoplastic resins that has a high flame-retardant imparting effect, and that produces a thermoplastic resin composition with superior moldability and workability that does not easily bleed out and a molded body with superior resistance to heat-moisture and chemicals; and a flame retardant for thermoplastic resins that has a high flame-retardant imparting effect, and that produces a flame retardant with a heat resistance to working temperatures of 300° C. or higher and a molded body with superior resistance to reflow heat and chemicals. Disclosed is a flame retardant, which is a specific flame retardant for thermoplastic resins comprising the reaction product of a nitrogen-containing compound and a phosphorous-containing compound, that is insoluble in toluene and comprises in the range of 5 to 10 wt % of phosphorus atoms.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: November 12, 2013
    Assignee: Kaneka Corporation
    Inventors: Shuji Taketani, Hidekazu Kawakubo, Noriyuki Suzuki, Tetsuro Yamamoto, Yutaka Kaneda
  • Publication number: 20130271435
    Abstract: A pixel circuit having a function of compensating for characteristic variation of an electro-optical element and threshold voltage variation of a transistor is formed from a reduced number of component elements. An input signal is sampled from a signal line so as to be held in a holding capacitor. The threshold voltage of the drive transistor is imparted to the holding capacitor in order to cancel an influence of the threshold voltage.
    Type: Application
    Filed: June 7, 2013
    Publication date: October 17, 2013
    Inventors: Katsuhide Uchino, Junichi Yamashita, Tetsuro Yamamoto
  • Publication number: 20130265214
    Abstract: An electroluminescent display panel has pixel circuits for an active matrix driving system. At least one of the pixel circuits has a thin-film transistor in which a portion of a pattern of a metal wiring material above a channel layer of the thin-film transistor is disposed to shield the channel region of the thin-film transistor.
    Type: Application
    Filed: June 4, 2013
    Publication date: October 10, 2013
    Inventors: Junichi Yamashita, Tetsuro Yamamoto, Katsuhide Uchino
  • Publication number: 20130249878
    Abstract: Disclosed herein is a display apparatus, including: a plurality of subpixels disposed adjacent each other and forming one pixel which forms a unit for formation of a color image; the plurality of subpixels including a first subpixel which emits light of the shortest wavelength and a second subpixel disposed adjacent the first subpixel; the second subpixel having a light blocking member disposed between the second subpixel and the first subpixel and having a width greater than a channel length or a channel width of a transistor which forms the second subpixel.
    Type: Application
    Filed: May 16, 2013
    Publication date: September 26, 2013
    Applicant: SONY CORPORATION
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8519919
    Abstract: A display device includes a display portion formed by disposing pixels in matrix, in which the pixel includes: a light emitting element; a signal level holding capacitor; a writing transistor for receiving a write signal from the vertical drive circuit, and being turned ON/OFF by the write signal, thereby setting a voltage across the terminals of the signal level holding capacitor at a signal level on a signal line; and a driving transistor for driving the light emitting device; and the vertical drive circuit sets a signal level of the write signal for an entire or partial time period of a time period for which the drive for the light emitting device is not influenced in a non-emission time period for which light emission of the light emitting device is stopped at a signal level of the write signal on a shorter time period side in other time periods.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: August 27, 2013
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Tetsuro Yamamoto, Takayuki Taneda
  • Patent number: 8508518
    Abstract: A pixel array section includes a plurality of pixel circuits disposed in a matrix and each including a driving transistor, a storage capacitor, an electro-optical element, and a sampling transistor. Each pixel circuit includes a pixel divided into a plurality of divisional pixels for each of which an electro-optical element is provided, and a test transistor provided between the driving transistor and the electro-optical elements for carrying out on/off operations for specifying whether or not the electro-optical element is a dark spot element so that the electro-optical element of the dark spot can be specified. The number of the test transistors is smaller than the number of the divisional elements of the original one pixel.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: August 13, 2013
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Tetsuro Yamamoto
  • Patent number: 8477087
    Abstract: A common power line shared by all the pixels allows threshold correction to be performed simultaneously on all the pixels. Video signal lines are set to a second reference potential higher than a reference potential, followed by multi-step threshold correction and video signal writing which are performed in a line sequential manner. Performing the threshold correction immediately before the video signal writing ensures shorter time from the threshold correction to the video signal writing. This suppresses leak currents, providing improved image quality.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: July 2, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8471834
    Abstract: A display device includes: a pixel array section having pixels arranged in a form of a matrix on a display panel; a first terminal group disposed on the display panel so as to correspond to each control line of a first control line group arranged in each pixel row of the pixel array section; a first wiring group for electrically connecting each terminal of the first terminal group to each control line of the first control line group; a second terminal group disposed on the display panel for a second control line group arranged in each pixel row of the pixel array section with a plurality of control lines as a unit; and a second wiring group for electrically connecting each terminal of the second terminal group to each control line of the second control line group through parts between the terminals of the first terminal group.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: June 25, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8471838
    Abstract: A pixel circuit includes: a light emitting element; a driving transistor for applying current to the light emitting element in response to a signal value applied between a gate and a source thereof when a driving voltage is applied between a drain and the source thereof; first and second capacitors connected in series between the gate and the source of the driving transistor; a sampling transistor connected between the gate of the driving transistor and a predetermined signal line; a switching transistor connected to supply a potential of the signal line to a node between the first and second capacitors; and a light detection element connected between the gate of the driving transistor and the node between the first and second capacitors for supplying current of a current amount in accordance with an emitted light amount of the light emitting element.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: June 25, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8451258
    Abstract: Disclosed herein is a display apparatus, including: a plurality of subpixels disposed adjacent each other and forming one pixel which forms a unit for formation of a color image; the plurality of subpixels including a first subpixel which emits light of the shortest wavelength and a second subpixel disposed adjacent the first subpixel; the second subpixel having a light blocking member disposed between the second subpixel and the first subpixel and having a width greater than a channel length or a channel width of a transistor which forms the second subpixel.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: May 28, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8446177
    Abstract: An inverter circuit includes: first to third transistors; and first and second capacity elements. The first transistor makes/breaks connection between an output terminal and a first voltage line in response to potential difference between an input terminal and the first voltage line or its correspondent. The second transistor makes/breaks connection between a second voltage line and the output terminal in response to potential difference between a gate of the second transistor and the output terminal or its correspondent. The third transistor makes/breaks connection between a gate of the second transistor and a third voltage line in response to potential difference between the input terminal and the third voltage line or its correspondent. The first and second capacity elements are inserted in series between the input terminal and the gate of the second transistor. A junction between the first and second capacity elements is connected to the output terminal.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: May 21, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8441417
    Abstract: A pixel circuit having a function of compensating for characteristic variation of an electro-optical element and threshold voltage variation of a transistor is formed from a reduced number of component elements. The pixel circuit includes an electro-optical element, a holding capacitor, a sampling transistor, a drive transistor, a switching transistor, and first and second detection transistors. The sampling transistor samples and supplies an input signal from a signal line so as to be held into the holding capacitor. The driving transistor drives the electro-optical element with current in response to the held signal potential. The first and second detection transistors supply a threshold voltage of the drive transistor into the holding capacitor in order to cancel an influence of the threshold voltage in advance.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: May 14, 2013
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Tetsuro Yamamoto
  • Patent number: 8432389
    Abstract: The present invention provides a panel, including: a plurality of pixel circuits disposed in rows and columns and each including a light emitting element for emitting light in response to driving current, a sampling transistor for sampling an image signal, a driving transistor for supplying the driving current to the light emitting element, and a storage capacitor for storing a predetermined potential; and a power supplying section configured to supply a power supply voltage of a high potential or a low potential at a time to all of the pixel circuits arranged in rows and columns; the power supplying section setting the power supply voltage to be supplied to the low potential, with which the gate-source voltage of the driving transistor becomes higher than a threshold voltage of the driving transistor, by Q times within a one-field period, Q being equal to or greater than 2.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: April 30, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8390543
    Abstract: A display device includes pixel array unit and a driver unit. A sampling transistor samples a signal potential to hold the signal potential in a holding capacitor. A driver transistor flows a drive current to a light emitting element in accordance with the signal potential held. A main scanner in the driver unit outputs the control signal having a shorter pulse width than the time period to the scan line to make the sampling transistor conductive during a time period while the signal line is at the signal potential, thereby adding the signal potential a correction for a mobility of the driver transistor when the signal potential is held in the holding capacitor.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: March 5, 2013
    Assignee: Sony Corporation
    Inventors: Yukihito Iida, Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8390541
    Abstract: After a sampling transistor is turned ON at a first timing when a control signal has risen, during a sampling period from a second timing when a video signal has risen from a reference potential to a signal potential to a third timing when the control signal has fallen and is turned OFF, the sampling transistor samples and writes the signal potential in a holding capacitance, and negatively feeds back a current flowing into a drive transistor during the sampling period to the holding capacitance and applies mobility correction of the drive transistor on the written signal potential. A signal driver adjusts the second timing for the video signal supplied to respective signal lines to correct a backward shift of the third timing due to a transmission delay along a scanning line of the control signal output from the control scanner.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: March 5, 2013
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Tetsuro Yamamoto
  • Patent number: 8390540
    Abstract: A display device includes: a pixel array having a plurality of pixels arranged in a matrix form, each of the pixels including a sampling transistor configured to sample a data potential from a video signal line which is insulated from and intersects a control line in response to the change in potential of the control line, and a light-emitting element configured to emit light at the brightness commensurate with the magnitude of the post-sampling data potential.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: March 5, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino
  • Publication number: 20130050067
    Abstract: A display device includes: a plurality of light-emitting elements, each light-emitting element having a light-emitting unit and a driving circuit for driving the light-emitting unit. The driving circuit at least includes (A) a drive transistor having source/drain regions, a channel forming region, and a gate electrode, (B) a video signal write transistor having source/drain regions, a channel forming region, and a gate electrode, and (C) a capacitive unit. In the drive transistor, (A-1) one of the source/drain regions is connected to the corresponding current supply line, (A-2) the other region of the source/drain regions is connected to the light-emitting unit and connected to one end of the capacitive unit, and forms a second node, and (A-3) the gate electrode is connected to the other region of the source/drain regions of the video signal write transistor and connected to the other end of the capacitive unit, and forms a first node.
    Type: Application
    Filed: August 17, 2012
    Publication date: February 28, 2013
    Applicant: Sony Corporation
    Inventors: Junichi Yamashita, Yusuke Onoyama, Tetsuo Minami, Naobumi Toyomura, Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8384626
    Abstract: Disclosed herein is an EL display panel module, including: a pixel array section including a panel serving as a substrate, and a plurality of pixels disposed in a matrix on the panel and each including a pixel circuit, and a light emitting region; and a driving circuit for driving the pixel circuits such that a threshold value correction operation is carried out commonly for plural ones of the pixel circuits which are connected to each signal line and writing of a signal potential corresponding to a gradation value is executed time-sequentially for the individual pixel circuits, the driving circuit applying a reset potential lower than a reference potential for the threshold value correction to the plural ones of the pixel circuits before first writing of the signal potential after the threshold value correction operation is completed; the pixel array section and the driving circuit being mounted on the same substrate.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: February 26, 2013
    Assignee: Sony Corporation
    Inventors: Tetsuro Yamamoto, Katsuhide Uchino