Patents by Inventor Masafumi Matsui

Masafumi Matsui 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).

  • Publication number: 20210262926
    Abstract: A moisture detecting apparatus includes: a light emitting unit including a first light source configured to emit light having a first wavelength as a peak wavelength, and a second light source configured to emit light having a second wavelength as a peak wavelength; a detecting unit configured to detect a first detection value indicating an extent to which the light emitted from the first light source is transmitted through a recording material, and a second detection value indicating an extent to which the light emitted by the second light source is transmitted through the recording material, based on a light receiving result of a light receiving unit; and a determination unit configured to determine a value related to a moisture content of the recording material based on the first detection value and the second detection value.
    Type: Application
    Filed: May 12, 2021
    Publication date: August 26, 2021
    Inventors: Mizuki Ishimoto, Norio Matsui, Masafumi Monde
  • Patent number: 10644092
    Abstract: A display panel includes a contact area which includes an upper conductive layer forming first electrodes of the organic EL elements, a lower conductive layer disposed below the upper conductive layer, a middle layer between the upper conductive layer and the lower conductive layer, and an insulating layer between the lower conductive layer and the middle layer. The middle layer includes a first area and a second area which are conductive and electrically connected to the upper conductive layer, and an insulating separating area which separates the first area and the second area. The lower conductive layer includes a first line which is electrically connected to the first area via a first contact hole, and a second line which is electrically connected to the second area via a second contact hole.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: May 5, 2020
    Assignee: JOLED INC.
    Inventors: Kenji Kokuda, Masafumi Matsui, Hitoshi Tsuge, Takashi Osako, Shigeo Homura, Ryoichi Yasuda
  • Patent number: 10614755
    Abstract: A display device includes a plurality of pixels arranged in rows and columns, a plurality of first power lines that extend in a pixel column direction and through which a power supply voltage is supplied to the pixels, and a plurality of second power lines that extend in the pixel column direction and through which an initialization voltage different from the power supply voltage is to the pixels. The number of first power lines is greater than the number of second power lines.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: April 7, 2020
    Assignee: JOLED INC.
    Inventors: Kohei Ebisuno, Masafumi Matsui, Hitoshi Tsuge
  • Patent number: 10482814
    Abstract: A method for driving a display device including a plurality of pixels arranged in rows and columns, each of the pixels including an organic EL device that emits light in accordance with supplied current, a driving transistor that supplies current to the organic EL device, and a storage capacitor connected between the gate of driving transistor and a source or drain thereof, includes causing the organic EL device to emit light by supplying current to the organic EL device; resetting charge of at least one of the storage capacitor and a parasitic capacitance of the organic EL device; and applying a reverse bias voltage between the gate and source of the driving transistor. The resetting is performed between the light emission and the reverse-bias application.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: November 19, 2019
    Assignee: JOLED INC.
    Inventors: Kohei Ebisuno, Shinya Ono, Masafumi Matsui
  • Patent number: 10395595
    Abstract: Pixel circuits each include a write transistor having a gate electrode connected to a write control line, one of a drain electrode and a source electrode connected to a data line for transmitting data voltage corresponding to luminance of the pixel circuit, and the other of the drain electrode and the source electrode connected to a gate electrode of a drive transistor. A compensation circuit includes a compensation transistor connected to a compensation signal line and the write control line. A compensation voltage generation circuit outputs compensation control voltage in accordance with a representative value of data voltage for the pixel circuits. A capacitance of the write control line caused by the compensation transistor and a capacitance of the write control line caused by the write transistors of the pixel circuits have mutually opposite voltage dependence with respect to the representative value of the data voltage for the pixel circuits.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: August 27, 2019
    Assignee: JOLED INC.
    Inventors: Masafumi Matsui, Hitoshi Tsuge, Kohei Ebisuno
  • Patent number: 10319303
    Abstract: A plurality of pixel circuits included in a display device each includes: a drive transistor; a capacitor connected to a gate electrode and a source electrode of the drive transistor; a light-emitting element which is driven by the drive transistor; a write transistor having a gate electrode connected to a write control line for transmitting a write signal, one of a drain electrode and a source electrode connected to a data line for transmitting a data voltage corresponding to luminance, and the other of the drain electrode and the source electrode connected to the gate electrode of the drive transistor; and a compensation transistor having a gate electrode connected to the data line, and at least one of a drain electrode and a source electrode connected to the write control line, the compensation transistor being of same conductivity type as the write transistor.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: June 11, 2019
    Assignee: JOLED INC.
    Inventors: Masafumi Matsui, Hitoshi Tsuge, Kohei Ebisuno
  • Patent number: 10304379
    Abstract: A display device includes: a display unit which includes a plurality of pixels each including an organic EL element; and a control unit which adjust a value of a luminance signal to be supplied to a target pixel to be corrected, such that an actual luminance of the target pixel is equal to a reference luminance, the reference luminance being an actual luminance of a reference pixel obtained when the luminance signal to be supplied to the target pixel is supplied to the reference pixel. The reference pixel has predetermined attenuation characteristics for light emission amount.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: May 28, 2019
    Assignee: JOLED, INC.
    Inventors: Masafumi Matsui, Eiji Iwauchi, Tomoyuki Maeda
  • Publication number: 20190115413
    Abstract: A display panel includes a contact area which includes an upper conductive layer forming first electrodes of the organic EL elements, a lower conductive layer disposed below the upper conductive layer, a middle layer between the upper conductive layer and the lower conductive layer, and an insulating layer between the lower conductive layer and the middle layer. The middle layer includes a first area and a second area which are conductive and electrically connected to the upper conductive layer, and an insulating separating area which separates the first area and the second area. The lower conductive layer includes a first line which is electrically connected to the first area via a first contact hole, and a second line which is electrically connected to the second area via a second contact hole.
    Type: Application
    Filed: August 2, 2018
    Publication date: April 18, 2019
    Applicant: JOLED INC.
    Inventors: Kenji KOKUDA, Masafumi MATSUI, Hitoshi TSUGE, Takashi OSAKO, Shigeo HOMURA, Ryoichi YASUDA
  • Patent number: 9960223
    Abstract: An active-matrix display device according to the present disclosure includes a plurality of pixels. Each of the pixels includes: a drive transistor disposed on a substrate; and an organic EL element that is caused by the drive transistor to emit light and includes an AM layer disposed above the substrate and a transparent electrode layer disposed above the AM layer. The active-matrix display device further includes: a source line that supplies data to the pixels; and a power supply line that supplies electric power to the pixels. The power supply line is shared by, among the plurality of pixels, two pixels that are adjacent to each other in a second direction that crosses a first direction in which the power supply line is extended. The source line and the AM layer are disposed not to overlap each other in a plan view of the substrate.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: May 1, 2018
    Assignee: JOLED INC.
    Inventors: Kohei Ebisuno, Masafumi Matsui, Hitoshi Tsuge
  • Publication number: 20170352314
    Abstract: Pixel circuits each include a write transistor having a gate electrode connected to a write control line, one of a drain electrode and a source electrode connected to a data line for transmitting data voltage corresponding to luminance of the pixel circuit, and the other of the drain electrode and the source electrode connected to a gate electrode of a drive transistor. A compensation circuit includes a compensation transistor connected to a compensation signal line and the write control line. A compensation voltage generation circuit outputs compensation control voltage in accordance with a representative value of data voltage for the pixel circuits. A capacitance of the write control line caused by the compensation transistor and a capacitance of the write control line caused by the write transistors of the pixel circuits have mutually opposite voltage dependence with respect to the representative value of the data voltage for the pixel circuits.
    Type: Application
    Filed: May 31, 2017
    Publication date: December 7, 2017
    Applicant: JOLED INC.
    Inventors: Masafumi MATSUI, Hitoshi TSUGE, Kohei EBISUNO
  • Publication number: 20170309696
    Abstract: An active-matrix display device according to the present disclosure includes a plurality of pixels. Each of the pixels includes: a drive transistor disposed on a substrate; and an organic EL element that is caused by the drive transistor to emit light and includes an AM layer disposed above the substrate and a transparent electrode layer disposed above the AM layer. The active-matrix display device further includes: a source line that supplies data to the pixels; and a power supply line that supplies electric power to the pixels. The power supply line is shared by, among the plurality of pixels, two pixels that are adjacent to each other in a second direction that crosses a first direction in which the power supply line is extended. The source line and the AM layer are disposed not to overlap each other in a plan view of the substrate.
    Type: Application
    Filed: April 20, 2017
    Publication date: October 26, 2017
    Applicant: JOLED INC.
    Inventors: Kohei EBISUNO, Masafumi MATSUI, Hitoshi TSUGE
  • Publication number: 20170309227
    Abstract: A display device includes a plurality of pixels arranged in rows and columns, a plurality of first power lines that extend in a pixel column direction and through which a power supply voltage is supplied to the pixels, and a plurality of second power lines that extend in the pixel column direction and through which an initialization voltage different from the power supply voltage is to the pixels. The number of first power lines is greater than the number of second power lines.
    Type: Application
    Filed: April 20, 2017
    Publication date: October 26, 2017
    Applicant: JOLED INC.
    Inventors: Kohei EBISUNO, Masafumi MATSUI, Hitoshi TSUGE
  • Publication number: 20170287401
    Abstract: A plurality of pixel circuits included in a display device each includes: a drive transistor; a capacitor connected to a gate electrode and a source electrode of the drive transistor; a light-emitting element which is driven by the drive transistor; a write transistor having a gate electrode connected to a write control line for transmitting a write signal, one of a drain electrode and a source electrode connected to a data line for transmitting a data voltage corresponding to luminance, and the other of the drain electrode and the source electrode connected to the gate electrode of the drive transistor; and a compensation transistor having a gate electrode connected to the data line, and at least one of a drain electrode and a source electrode connected to the write control line, the compensation transistor being of same conductivity type as the write transistor.
    Type: Application
    Filed: March 28, 2017
    Publication date: October 5, 2017
    Applicant: JOLED INC.
    Inventors: Masafumi MATSUI, Hitoshi TSUGE, Kohei EBISUNO
  • Publication number: 20170278461
    Abstract: There is provided a drive method for a display device in which a plurality of pixel circuits are disposed in rows and columns, each of the plurality of pixel circuits including a light emitter that emits light in an amount according to a magnitude of a current supplied, and a drive transistor that supplies a current according to a magnitude of a video signal to the light emitter. The drive method includes applying an initialization voltage across a gate and a source of the drive transistor by an initialization voltage adjustment unit in an initialization period for initializing the drive transistor, the initialization voltage being higher than a threshold voltage of the drive transistor and according to a state of deterioration of the drive transistor.
    Type: Application
    Filed: August 10, 2015
    Publication date: September 28, 2017
    Applicant: JOLED INC.
    Inventors: Tomoyuki MAEDA, Masafumi MATSUI
  • Publication number: 20170270856
    Abstract: A method for driving a display device including a plurality of pixels arranged in rows and columns, each of the pixels including an organic EL device that emits light in accordance with supplied current, a driving transistor that supplies current to the organic EL device, and a storage capacitor connected between the gate of driving transistor and a source or drain thereof, includes causing the organic EL device to emit light by supplying current to the organic EL device; resetting charge of at least one of the storage capacitor and a parasitic capacitance of the organic EL device; and applying a reverse bias voltage between the gate and source of the driving transistor. The resetting is performed between the light emission and the reverse-bias application.
    Type: Application
    Filed: July 31, 2015
    Publication date: September 21, 2017
    Applicant: JOLED INC.
    Inventors: Kohei EBISUNO, Shinya ONO, Masafumi MATSUI
  • Publication number: 20170076668
    Abstract: A display device includes: a display unit which includes a plurality of pixels each including an organic EL element; and a control unit which adjust a value of a luminance signal to be supplied to a target pixel to be corrected, such that an actual luminance of the target pixel is equal to a reference luminance, the reference luminance being an actual luminance of a reference pixel obtained when the luminance signal to be supplied to the target pixel is supplied to the reference pixel. The reference pixel has predetermined attenuation characteristics for light emission amount.
    Type: Application
    Filed: May 12, 2015
    Publication date: March 16, 2017
    Applicant: JOLED INC.
    Inventors: Masafumi MATSUI, Eiji IWAUCHI, Tomoyuki MAEDA
  • Patent number: 9560794
    Abstract: A cooling device for cooling a rack-type server of which a housing includes a plurality of electronic devices includes an interior cooling unit and an exterior cooling unit. The interior cooling unit includes a heat-receiving unit, a heat dissipation unit, an outward path pipe, and a return path pipe. The interior cooling unit allows working fluid to be circulated through the heat-receiving unit, the outward path pipe, the heat dissipation unit, the return path pipe, and the heat-receiving unit to thereby move the heat from the heat-receiving unit to the heat dissipation unit. The exterior cooling unit has a heat exchange unit abutted on the heat dissipation unit and allows, by a circulated cooling medium, the heat of the working fluid discharged from the heat dissipation unit to be dissipated to external air.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: January 31, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kaoru Sato, Makoto Sugiyama, Wakana Nogami, Shunji Miyake, Ayaka Suzuki, Mutsuhiko Matsumoto, Masafumi Matsui, Hiroshi Shibata
  • Patent number: 9443608
    Abstract: A shift register includes unit circuits connected in a cascade, and each of the unit circuits includes a logic circuit, a first output unit, and a second output unit. The first output unit is a buffer amplifier for outputting a driving signal and includes: a first transistor for outputting a first voltage; and a second transistor for outputting a second voltage lower than the first voltage. The second output unit is a buffer amplifier for outputting a signal to a next unit circuit in the cascade and includes: a third transistor for outputting a third voltage; and a fourth transistor for outputting a fourth voltage lower than the third voltage. The second voltage is set at a potential higher than the fourth voltage.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: September 13, 2016
    Assignee: JOLED INC.
    Inventors: Masafumi Matsui, Hitoshi Tsuge
  • Patent number: 9443878
    Abstract: A display device includes a lower wiring layer, an interlayer insulating layer, and an upper wiring layer. The lower wiring layer includes first partial electrode portions, first cuttable portions, and first openings; the upper wiring layer includes second partial electrode portions, second cuttable portions, and second openings. The first partial electrode portions and the second partial electrode portions are disposed in overlapping positions in the stacking direction; all the first cuttable portions and the second openings are disposed in overlapping positions in the stacking direction; all the second cuttable portions and the first openings are disposed in overlapping positions in the stacking direction.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: September 13, 2016
    Assignee: JOLED INC.
    Inventors: Masafumi Matsui, Kouhei Ebisuno
  • Patent number: 9192074
    Abstract: The present invention provides a cooling device for rack-type electronic equipment. The rack-type electronic equipment is provided with electronic circuit devices having different heating quantities inside an enclosure, and the cooling device has multiple heat pipes for cooling the rack-type electronic equipment. A condenser unit is provided on the upper surface of the enclosure, an evaporator is provided on the back surface of the enclosure, and each electronic circuit device having a different heating quantity is cooled by means of the heat pipes.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: November 17, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hiroshi Shibata, Mutsuhiko Matsumoto, Masafumi Matsui, Shigeyuki Hosono