Patents by Inventor Junichi Yamashita

Junichi Yamashita 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: 8773335
    Abstract: A display device is disclosed. The display device includes: a pixel array unit and a driving unit which drives the pixel array unit. The pixel array unit includes rows of first scanning lines and second scanning lines, columns of signals, pixels in a matrix state arranged at portions where the scanning lines and the signal lines cross each other and power supply lines and ground lines supplying power to respective pixels. The driving unit includes a first scanner performing line-sequential scanning to pixels by each row by supplying a first control signal to each first scanning line sequentially, a second scanner supplying a second control signal to each second scanning line sequentially so as to correspond to the line-sequential scanning and a signal selector supplying a video signal to rows of signal lines so as to correspond to the line-sequential scanning.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: July 8, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Takao Tanikame, Katsuhide Uchino
  • Publication number: 20140175447
    Abstract: In a display apparatus including a switching transistor, a correction voltage for eliminating an effect of a variation in a characteristic of a driving transistor is stored in a storage capacitor. The switching transistor is disposed between one current terminal of the driving transistor and a light emitting element. The switching transistor turns off during the non-light emission period thereby to electrically disconnect the light emitting element from the one current terminal of the driving transistor thereby preventing a leakage current from flowing through the light emitting element during the period in which the correction unit operates, and thus preventing the correction voltage from having an error due to the leakage current.
    Type: Application
    Filed: February 27, 2014
    Publication date: June 26, 2014
    Applicant: SONY CORPORATION
    Inventors: Junichi Yamashita, Masatsugu Tomida, Katsuhide Uchino
  • Patent number: 8760373
    Abstract: A pixel circuit, display device, and method of driving a pixel circuit enabling source-follower output with no deterioration of luminance even with a change of the current-voltage characteristic of the light emitting element along with elapse, enabling a source-follower circuit of n-channel transistors, and able to use an n-channel transistor as an EL drive transistor while using current anode-cathode electrodes, wherein a source of a TFT 111 as a drive transistor is connected to an anode of a light emitting element 114, a drain is connected to a power source potential VCC, a capacitor C111 is connected between a gate and source of the TFT 111, and a source potential of the TFT 111 is connected to a fixed potential through a TFT 113 as a switching transistor.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: June 24, 2014
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Tetsuro Yamamoto
  • Patent number: 8754833
    Abstract: A pixel circuit, display device, and method of driving a pixel circuit enabling source-follower output with no deterioration of luminance even with a change of the current-voltage characteristic of the light emitting element along with elapse, enabling a source-follower circuit of n-channel transistors, and able to use an n-channel transistor as an EL drive transistor while using current anode-cathode electrodes, wherein a source of a TFT 111 as a drive transistor is connected to an anode of a light emitting element 114, a drain is connected to a power source potential VCC, a capacitor C111 is connected between a gate and source of the TFT 111, and a source potential of the TFT 111 is connected to a fixed potential through a TFT 113 as a switching transistor.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: June 17, 2014
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Tetsuro Yamamoto
  • Publication number: 20140152723
    Abstract: A display apparatus includes: a pixel array section including a row of scanning lines, a column of signal lines, and pixels in a matrix, each of the pixels disposed at an intersection of both of the lines; and a drive section. The drive section performs line progressive scanning on the pixels. The pixel includes a light emitting device, a sampling transistor, a driving transistor, a switching transistor, and a holding capacitor. The sampling transistor samples a video signal in the holding capacitor, the driving transistor changes the device to a luminous state, the switching transistor becomes ON in advance of the sampling of the video signal to change the light emitting device to a non-luminous state, and the sampling transistor takes in the OFF voltage from the signal line to the driving transistor, thereby preventing a penetration current from flowing from the power source toward the fixed potential.
    Type: Application
    Filed: February 7, 2014
    Publication date: June 5, 2014
    Applicant: SONY CORPORATION
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 8743032
    Abstract: Disclosed here in is a display apparatus, including, a pixel array section including a plurality of pixels arrayed in rows and columns and each including an electro-optical device, a pixel circuit provided commonly to each plural ones of the pixels in the same pixel row in the pixel array section and including a writing transistor for writing an image signal, a holding capacitor for holding the image signal written by the writing transistor and a driving transistor for driving the electro-optical devices of the plural pixels, and a plurality of scanning circuits configured to time-divisionally and selectively place the electro-optical devices included in the pixels into a forwardly biased state.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: June 3, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Publication number: 20140145113
    Abstract: A liquid crystal compound having high stability to heat, light and so forth, a high clearing point, a low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, a suitable elastic constant and excellent compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition. The compound is represented by formula (1-1): wherein, for example, R1 is hydrogen, halogen or alkyl having 1 to 20 carbons; ring A1, ring A2, ring A3, ring A4 and ring A5 are independently 1,4-cyclohexylene or 1,4-phenylene; Z1, Z2, Z3 and Z4 are independently a single bond, —(CH2)2—, —CH?CH— or —CF?CF—: and a, b, c and d are independently 0 or 1, and a sum of a, b, c and d is one or more.
    Type: Application
    Filed: November 26, 2013
    Publication date: May 29, 2014
    Applicants: JNC PETROCHEMICAL CORPORATION, JNC CORPORATION
    Inventors: Tomohiro YANO, Junichi YAMASHITA
  • Patent number: 8736521
    Abstract: A display device includes a pixel array portion in which sub-pixels each including an electro-optic element, a write transistor for writing a video signal, a hold capacitor for holding the video signal written by the write transistor, and a drive transistor for driving the electro-optic element in accordance with the video signal held in the hold capacitor are disposed in a matrix, and each unit pixel is composed of the plurality of adjacent sub-pixels belonging to a plurality of rows. The display device further includes power source supply lines through which power source potentials different in potential from one another are selectively supplied to the drive transistors. One power source supply line is wired every plural rows.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: May 27, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 8736526
    Abstract: A display unit with which luminance is able to be improved and a wide view angle is able to be secured while increase of the power consumption is inhibited is provided. The display unit includes a first region placing priority on front face luminance in which an aperture ratio of a light emitting region is relatively small, a second region placing priority on view angle luminance in which the aperture ratio of the light emitting region is relatively large, and a drive means for driving the first region and the second region.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: May 27, 2014
    Assignee: Sony Corporation
    Inventors: Yuuki Seo, Junichi Yamashita, Katsuhide Uchino
  • Publication number: 20140139569
    Abstract: A driving method of a display device having a driving transistor and a display element, one source/drain region of the driving transistor connected to a power supply part, the other source/drain region connected to an anode electrode provided in the display element, the method includes the steps of: setting a potential of the anode electrode by applying a predetermined intermediate voltage to the anode electrode so that a potential difference between the anode electrode of the display element and a cathode electrode at the other end of the display element does not exceed a threshold voltage of the display element; and then holding the driving transistor in OFF-state while a drive voltage is applied from the power supply part to one source/drain region of the driving transistor.
    Type: Application
    Filed: January 28, 2014
    Publication date: May 22, 2014
    Applicant: SONY CORPORATION
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Publication number: 20140139106
    Abstract: A light-emitting element includes an emitting unit and a driving circuit configured to drive the emitting unit. The driving circuit includes a driving transistor, an image signal writing transistor, and a capacitor unit. The driving circuit is connected to a current supply line and a scanning line both extending in a first direction and connected to a data line extending in a second direction. The current supply line and the scanning line are formed on the first interlayer insulating layer and the first interlayer insulating layer, the current supply line, and the scanning line are covered with a second interlayer insulating layer. The data line is formed on the second interlayer insulating layer. A shield wall extending in the first direction is provided to the second interlayer insulating layer between one light-emitting element and a light-emitting element adjacent to the one light-emitting element in the second direction.
    Type: Application
    Filed: September 12, 2013
    Publication date: May 22, 2014
    Applicant: SONY CORPORATION
    Inventors: Tetsuo Minami, Junichi Yamashita
  • Publication number: 20140132175
    Abstract: A light-emitting element includes a light-emitting section and a driving circuit that drives the light-emitting section. The driving circuit includes at least (A) a drive transistor that is a p-channel field effect transistor, (B) an image-signal writing transistor that is a p-channel field effect transistor, (C) a light-emission control transistor that is a p-channel field effect transistor, and (D) a capacitor. Each of the drive transistor, image-signal writing transistor, and light-emission control transistor is provided in an n-type well formed in a p-type silicon semiconductor substrate. A first source/drain region of the drive transistor is electrically connected to the n-type well in which the drive transistor is formed.
    Type: Application
    Filed: November 7, 2013
    Publication date: May 15, 2014
    Applicant: Sony Corporation
    Inventors: Nobuaki Hokazono, Junichi Yamashita, Yusuke Onoyama
  • Publication number: 20140132647
    Abstract: Disclosed herein is a display apparatus including a pixel array and a driver, the pixel array including rows of scanning lines, rows of feeding lines, columns of signal lines, and a matrix of pixels disposed at the crossings of the scanning lines and the signal lines, the driver including a write scanner for supplying a control signal successively to the scanning lines, a power supply scanner for switching each of the feeding lines between a high potential, a low potential, and an intermediate potential between the high potential and the low potential, and a signal selector for supplying a video signal, which alternately switches between a signal potential and a reference potential, to each of the signal lines.
    Type: Application
    Filed: January 16, 2014
    Publication date: May 15, 2014
    Applicant: SONY CORPORATION
    Inventors: Junichi Yamashita, Katsuhide Uchino
  • Patent number: 8723761
    Abstract: A pixel circuit, display device, and method of driving a pixel circuit enabling source-follower output with no deterioration of luminance even with a change of the current-voltage characteristic of the light emitting element along with elapse, enabling a source-follower circuit of n-channel transistors, and able to use an n-channel transistor as an EL drive transistor while using current anode-cathode electrodes, wherein a source of a TFT 111 as a drive transistor is connected to an anode of a light emitting element 114, a drain is connected to a power source potential VCC, a capacitor C111 is connected between a gate and source of the TFT 111, and a source potential of the TFT 111 is connected to a fixed potential through a TFT 113 as a switching transistor.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: May 13, 2014
    Assignee: Sony Corporation
    Inventors: Katsuhide Uchino, Junichi Yamashita, Tetsuro Yamamoto
  • Patent number: 8723847
    Abstract: A display device includes: a screen unit; a drive unit; and a signal processing unit, wherein the screen unit includes rows of scanning lines, columns of signal lines, matrix-state pixel circuits and a light sensor, the drive unit includes a scanner supplying a control signal to the scanning lines and a driver supplying a video signal to the signal lines, the screen unit is sectioned into plural regions each having plural pixel circuits, the pixel circuit emits light in accordance with the video signal, the light sensor is arranged with respect to each region and outputs a luminance signal in accordance with the light emission; and the signal processing unit corrects the video signal in accordance with the luminance signal and supplies the signal to the driver.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: May 13, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Keisuke Omoto, Katsuhide Uchino
  • Publication number: 20140125566
    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: January 15, 2014
    Publication date: May 8, 2014
    Applicant: SONY CORPORATION
    Inventors: Junichi Yamashita, Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8710617
    Abstract: In a region located between a collector electrode and a semiconductor substrate, there are a portion where a hollow region is located and a portion where no hollow region is located. Between the collector electrode and the portion where no hollow region is located in the semiconductor substrate, a floating silicon layer electrically isolated by insulating films is formed.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: April 29, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Junichi Yamashita, Tomohide Terashima
  • Patent number: 8698707
    Abstract: An electroluminescent display panel has pixel circuits for the active matrix driving system. Each pixel circuit has a thin-film transistor in which a portion of a pattern of a metal wiring material above the channel layer of the thin-film transistor is so laid out as to shield the channel region of the thin-film transistor.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: April 15, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Tetsuro Yamamoto, Katsuhide Uchino
  • Patent number: 8698711
    Abstract: In a display apparatus including a switching transistor, a correction voltage for eliminating an effect of a variation in a characteristic of a driving transistor is stored in a storage capacitor. The switching transistor is disposed between one current terminal of the driving transistor and a light emitting element. The switching transistor turns off during the non-light emission period thereby to electrically disconnect the light emitting element from the one current terminal of the driving transistor thereby preventing a leakage current from flowing through the light emitting element during the period in which the correction unit operates, and thus preventing the correction voltage from having an error due to the leakage current.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: April 15, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Masatsugu Tomida, Katsuhide Uchino
  • Patent number: 8692744
    Abstract: A display device is disclosed. The display device includes: a pixel array unit and a driving unit which drives the pixel array unit. The pixel array unit includes rows of first scanning lines and second scanning lines, columns of signals, pixels in a matrix state arranged at portions where the scanning lines and the signal lines cross each other and power supply lines and ground lines supplying power to respective pixels. The driving unit includes a first scanner performing line-sequential scanning to pixels by each row by supplying a first control signal to each first scanning line sequentially, a second scanner supplying a second control signal to each second scanning line sequentially so as to correspond to the line-sequential scanning and a signal selector supplying a video signal to rows of signal lines so as to correspond to the line-sequential scanning.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: April 8, 2014
    Assignee: Sony Corporation
    Inventors: Junichi Yamashita, Takao Tanikame, Katsuhide Uchino