Patents by Inventor Kenta Kajiyama

Kenta Kajiyama 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: 20160141341
    Abstract: A sub-pixel is provided in a display area of an organic EL display device. A bank layer surrounds an outer periphery of the sub-pixel. A contact area is positioned in the display area and is adjacent to the sub-pixel through the bank layer. A pixel electrode is provided in the sub-pixel. A common electrode is disposed across the sub-pixel and the contact area. At least a part of an auxiliary conductive layer is positioned in the contact area. A contact hole is provided in the contact area and electrically connects the common electrode and the auxiliary conductive layer.
    Type: Application
    Filed: November 12, 2015
    Publication date: May 19, 2016
    Inventors: Kenta KAJIYAMA, Toshihiro SATO
  • Patent number: 9235999
    Abstract: A display device includes a plurality of pixels each including a mechanical shutter. The display device electrically controls the position of the mechanical shutter to provide image display. Each of the pixels includes a pixel circuit for electrically controlling the position of the mechanical shutter. The pixel circuit includes a first control electrode and a second control electrode provided as a pair with respect to the mechanical shutter; a first mean for applying a prescribed control voltage to the first control electrode and the second control electrode to put the mechanical shutter and the first control electrode or the second control electrode into contact with each other; and a second mean for, in a state where the mechanical shutter is at a stop, decreasing a potential difference between the mechanical shutter and the first control electrode or the second control electrode which is in contact with the mechanical shutter.
    Type: Grant
    Filed: December 24, 2012
    Date of Patent: January 12, 2016
    Assignee: Pixtronix, Inc.
    Inventors: Hajime Akimoto, Takahiko Muneyoshi, Kenta Kajiyama
  • Publication number: 20160005361
    Abstract: [PROBLEM] To provide substantially the same voltage to a shutter electrode and a pair of control electrodes, and to prevent degradation of the mechanical shutter, during a discharge period in a movable shutter system in an image display device.
    Type: Application
    Filed: March 21, 2014
    Publication date: January 7, 2016
    Applicant: Pixtronix, Inc.
    Inventors: Kenta Kajiyama, Katsumi Matsumoto, Hideki Nakagawa, Takahide Kuranaga, Takeomi Morita
  • Patent number: 9013523
    Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an endpoint of the one frame period in accordance with an increase of the gray level.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: April 21, 2015
    Assignee: Pixtronix, Inc.
    Inventors: Kenta Kajiyama, Hajime Akimoto
  • Patent number: 8994635
    Abstract: The invention provides an image display device capable of reducing the transmission delay of a scanning signal. A plurality of scanning signal lines are wired in one pixel circuit row. Pixel circuits of the pixel circuit row are connected to any of the plurality of scanning signal lines.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: March 31, 2015
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kenta Kajiyama, Takeshi Izumida, Norihiro Nakamura, Naoki Tokuda
  • Publication number: 20140247293
    Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an endpoint of the one frame period in accordance with an increase of the gray level.
    Type: Application
    Filed: May 15, 2014
    Publication date: September 4, 2014
    Applicant: PIXTRONIX, INC.
    Inventors: Kenta KAJIYAMA, Hajime AKIMOTO
  • Publication number: 20140204132
    Abstract: A display device includes: a light emission control part which allows a light source to emit the light having one of the plural different main wavelengths in each of plural sub frames; a display panel which controls the transmission of light in each pixel; and a display control part which controls the display panel corresponding to a gray level value with respect to the each pixel, wherein the light emitting control part performs the light emission of light having a first main wavelength in a first sub frame in accordance with a light emission amount weighted based on a time for calculation including a first interval which is a interval between the first sub frame where the first main wavelength is emitted and a second sub frame where the first main wavelength is emitted after the first sub frame.
    Type: Application
    Filed: March 21, 2014
    Publication date: July 24, 2014
    Applicant: Pixtronix, Inc.
    Inventors: Hajime AKIMOTO, Kenta KAJIYAMA
  • Patent number: 8730279
    Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into: a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an end point of the one frame period in accordance with an increase of the gray level.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: May 20, 2014
    Assignee: Pixtronix, Inc.
    Inventors: Kenta Kajiyama, Hajime Akimoto
  • Patent number: 8723900
    Abstract: A display device includes: a light emission control part which allows a light source to emit the light having one of the plural different main wavelengths in each of plural sub frames; a display panel which controls the transmission of light in each pixel; and a display control part which controls the display panel corresponding to a gray level value with respect to the each pixel, wherein the light emitting control part performs the light emission of light having a first main wavelength in a first sub frame in accordance with a light emission amount weighted based on a time for calculation including a first interval which is a interval between the first sub frame where the first main wavelength is emitted and a second sub frame where the first main wavelength is emitted after the first sub frame.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: May 13, 2014
    Assignee: Pixtronix, Inc.
    Inventors: Hajime Akimoto, Kenta Kajiyama
  • Patent number: 8441186
    Abstract: An organic electroluminescence display device is disclosed wherein plural organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plural organic electroluminescence elements including organic electroluminescence elements developing different colors in a row direction, and at least one of the organic layers having an outer edge of a conic section at an end portion in a column direction thereof, the outer edge of the conic section becoming narrower gradually in its width in a row direction of vapor deposition thereof toward an extreme end at an end portion in a column direction thereof. The organic electroluminescence display device can improve the vapor deposition accuracy and the degree of design freedom.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: May 14, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Noriharu Matsudate, Takeshi Ookawara, Kenta Kajiyama
  • Patent number: 8330711
    Abstract: A plurality of data signal lines each of which is connected to at least one pixel circuit in one pixel circuit column and is not connected to the pixel circuits of other pixel circuit columns are provided to one pixel circuit column, and the pixel circuits in the pixel circuit column are connected to any one of the plurality of data signal lines. An image display device having such a constitution can alleviate lowering of display quality attributed to transmission delay or voltage drop of a scanning signal.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: December 11, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kenta Kajiyama, Takeshi Izumida, Norihiro Nakamura
  • Publication number: 20120293572
    Abstract: A display device includes: a light emission control part which allows a light source to emit the light having one of the plural different main wavelengths in each of plural sub frames; a display panel which controls the transmission of light in each pixel; and a display control part which controls the display panel corresponding to a gray level value with respect to the each pixel, wherein the light emitting control part performs the light emission of light having a first main wavelength in a first sub frame in accordance with a light emission amount weighted based on a time for calculation including a first interval which is a interval between the first sub frame where the first main wavelength is emitted and a second sub frame where the first main wavelength is emitted after the first sub frame.
    Type: Application
    Filed: May 14, 2012
    Publication date: November 22, 2012
    Inventors: Hajime AKIMOTO, Kenta Kajiyama
  • Publication number: 20120293563
    Abstract: A display device which includes a light source which independently emits light of three colors of RGB, and an emission control unit which controls the light source to continuously emit one of principal wavelength light beams of three RGB light beams in each of the sub-frames, in which the emission control unit controls a Green light as one of the plural principal wavelengths among light beams of three RGB colors to be emitted in the sub-frame which is arranged at the same position in the one frame period of both an odd frame as the odd numbered single frame period and an even frame as the even numbered single frame period, and controls light of the R color and the B color to be emitted in different sub-frames between the odd frames and the even frames.
    Type: Application
    Filed: May 14, 2012
    Publication date: November 22, 2012
    Inventors: Hajime Akimoto, Kenta Kajiyama
  • Publication number: 20120293564
    Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into: a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an end point of the one frame period in accordance with an increase of the gray level.
    Type: Application
    Filed: May 14, 2012
    Publication date: November 22, 2012
    Inventors: Kenta KAJIYAMA, Hajime Akimoto
  • Publication number: 20120105501
    Abstract: An image display device includes: a light-emitting element that emits light corresponding to an amount of current in an emission period; a storage capacitor to which a display potential is supplied to one end thereof before the emission period and which stores a voltage corresponding to the display potential; a driving transistor that adjusts an amount of current flowing in a drain electrode thereof in accordance with the voltage stored by the storage capacitor; a lighting control switch which is connected in series with the light-emitting element from the drain electrode of the driving transistor and which is turned on in the emission period; and a discharge switch that connects a node in a current path from the driving transistor to the light-emitting element, through which a current flows when the lighting control switch is turned on, to a wiring that supplies a discharge potential before the emission period.
    Type: Application
    Filed: October 26, 2011
    Publication date: May 3, 2012
    Inventors: Norihiro NAKAMURA, Kenta KAJIYAMA, Hajime AKIMOTO, Kouji IKEDA
  • Patent number: 8148896
    Abstract: The present invention provides an organic electroluminescent display device and a method of repairing a defective pixel of an organic electroluminescent display device which can realize the repairing a defective pixel to a light emitting pixel by electrically separating a leak portion which generates a defective pixel. To be more specific, a peeling suppression layer is formed between an anode and an organic light emitting layer formed on a main substrate, and a cavity is formed between the main substrate and the peeling suppression layer due to the evaporation generated by an absorption of laser beams thus electrically separating a defective portion so as to repair a black-dot defective pixel to form a light emitting pixel.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: April 3, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystals Display Co., Ltd.
    Inventors: Kenta Kajiyama, Toshihiro Sato, Naoki Tokuda
  • Publication number: 20120050252
    Abstract: An nMOS is used for a drive TFT and a display device is provided without being affected by variations in the threshold voltage of the drive TFT. A display device includes: a field-effect transistor that controls a drive current of a light emitting element; a first switch provided between a source of the field-effect transistor and an anode terminal of the light emitting element; a second switch provided between the source of the field-effect transistor and a signal line; a third switch provided between a drain of the field-effect transistor and a power supply line; a fourth switch provided between the drain and a gate of the field-effect transistor; a capacitor provided between the gate of the field-effect transistor and the anode terminal of the light emitting element; and a fifth switch provided between the anode terminal of the light emitting element and a predetermined voltage supply line.
    Type: Application
    Filed: August 11, 2011
    Publication date: March 1, 2012
    Inventors: Hajime Akimoto, Masahisa Tsukahara, Kenta Kajiyama
  • Publication number: 20110310137
    Abstract: The present invention provides an image display device comprising data lines each supplying a data signal, and a plurality of pixel circuits. Each of the pixel circuits includes a light-emitting element, a capacitor which stores a difference in potential caused by the data signal therein, a drive transistor which has a gate electrode connected to the data line via the capacitor and controls light emission of the light-emitting element based on a difference in potential between the gate electrode and a source electrode thereof, which is generated by a potential supplied by the data line and the potential difference stored in the capacitor, and a variation control switch which causes the difference in potential between the gate and source electrodes of the drive transistor to vary based on the data signal at the turning on thereof and prevents the difference in potential from varying at the turning off thereof.
    Type: Application
    Filed: June 17, 2011
    Publication date: December 22, 2011
    Inventors: Kenta Kajiyama, Takeshi Izumida, Naoki Tokuda, Hajime Akimoto
  • Publication number: 20110234568
    Abstract: A display device includes: scanning lines for selecting a group of pixels out of pixels; control lines to which a pulse signal is supplied to control selection of at least one of the plurality of scanning lines to which a scanning signal is input; a scanning circuit which includes transistors controlled with the pulse signal, the scanning circuit being connected to the plurality of scanning lines and being disposed outside a display area; and a conductive mesh including conductive wires running in intersecting directions. The conductive mesh is placed above the transistors and the plurality of scanning lines except the display area. Above the plurality of scanning lines, the plurality of conductive wires constituting the conductive mesh intersect each other three-dimensionally in a manner that does not make the plurality of conductive wires parallel to the plurality of scanning lines.
    Type: Application
    Filed: March 18, 2011
    Publication date: September 29, 2011
    Inventors: Takeshi IZUMIDA, Kenta Kajiyama, Naoki Tokuda, Yasuharu Yatsu, Noriyuki Shikina
  • Publication number: 20110221791
    Abstract: An image display device includes pixel circuits, a power supply line, and a data line for supplying a data signal to the pixel circuits. The pixel circuits each include a light emitting element, a drive transistor for controlling light emission of the light emitting element, a storage capacitor provided between the data line and a gate electrode of the drive transistor, a both-end connection switch for connecting both ends of the storage capacitor to each other, and a current interruption switch for interrupting a path of a current flowing from the power supply line through the both-end connection switch. Before the data signal is supplied to each of the pixel circuits, the both-end connection switch connects the both ends of the storage capacitor to each other, and the current interruption switch is disconnected.
    Type: Application
    Filed: March 8, 2011
    Publication date: September 15, 2011
    Inventors: Kenta KAJIYAMA, Takeshi Izumida, Naoki Tokuda, Hajime Akimoto, Hiroshi Kageyama, Norihiro Nakamura, Masami Iseki