Patents by Inventor Tetsuo Fukami

Tetsuo Fukami 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: 8711293
    Abstract: In one embodiment, a pair of liquid crystal shutter glasses include a first liquid crystal shutter and a second liquid crystal shutter. The first and second liquid crystal shutters are switched to a transmissive state by turns. The respective first and second liquid crystal shutters include a first electrode substrate and a second electrode substrate opposing the first electrode substrate. An OCB (Optically Compensated Bend) mode liquid crystal layer is held between the first and second electrode substrates. The first electrode substrate includes a first electrode and a second electrode arranged adjacent to the first electrode. The first and second electrodes respectively include a side opposing each other and a plurality of projecting portions provided to the respective opposing sides of the first and second electrodes alternately.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: April 29, 2014
    Assignee: Japan Display Inc.
    Inventors: Tetsuo Fukami, Shigesumi Araki, Tetsuya Kojima, Toshiyuki Higano, Kenji Nakao
  • Patent number: 8547486
    Abstract: A liquid crystal shutter includes a first support substrate having a first electrode and a second support substrate having a second electrode opposite to the first electrode. A liquid crystal layer is sandwiched between the first and second electrodes so as to have a switching region. The switching region becomes a bend alignment state from a splay alignment state when a voltage is applied to the liquid crystal layer. A nucleus region formation portion is arranged on the first support substrate to form a nucleus region in the switching region corresponding to the nucleus region formation portion in the liquid crystal layer, in which the splay alignment is more stable than in the switching region.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: October 1, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Tetsuya Kojima, Toshiyuki Higano, Shigesumi Araki, Tetsuo Fukami, Kazuhiro Nishiyama
  • Patent number: 8477269
    Abstract: In one embodiment, a liquid crystal display device includes a first substrate having a first pixel electrode and a first pillar-shaped spacer arranged in an active area, and a second pixel electrode and a second pillar-shaped spacer arranged in a shield area surrounding the active area. A shield layer is formed in the shape of a belt crossing above the first pillar-shaped spacer in the active area and extending to the shield area including a portion above the second pillar-shaped spacer. The height of a first seat layer formed above the first pillar-shaped spacer and including the shield layer, a first color filter layer and an overcoat layer is substantially the same as that of a second seat layer formed above the second pillar-shaped spacer and including the shield layer, a second color filter layer and the overcoat layer.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: July 2, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Satoshi Asada, Daiichi Suzuki, Tetsuo Fukami
  • Patent number: 8477127
    Abstract: A liquid crystal display device includes a display portion having a first substrate, a second substrate opposing to the first substrate, a liquid crystal layer held between the first and second substrates, and a plurality of pixels arranged in a delta shape. A plurality of pixel electrodes are respectively connected to signal lines extending in a first direction via a switch. The switch is controlled by scanning lines extending in a second direction which orthogonally crosses the first direction. The signal lines extend in a space between the pixel electrodes in a meandering shape in the second direction, and two kinds of color pixels are connected with a common signal line in turn via the pixel switch.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: July 2, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Yukio Tanaka, Tetsuo Fukami, Emi Higano, Shigesumi Araki, Ken Shiiba
  • Patent number: 8451206
    Abstract: A liquid crystal display device includes a liquid crystal display panel (LCD panel), an area light source device which illuminates the LCD panel, a driving unit which drives the LCD panel and the area light source device, and a control unit which controls the driving unit. The LCD panel includes display pixels. The area light source device includes plural kinds of light sources which are successively turned on in one frame period. The control unit includes means for controlling the driving unit in a manner to execute video signal write and reset signal write after the video signal write, in a period in which one of the plural kinds of light sources is turned on in the one frame period. The video signal write and the reset signal write are executed with the same polarity, and a polarity of potential of the display pixels is reversed between frame periods.
    Type: Grant
    Filed: September 5, 2007
    Date of Patent: May 28, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Yukio Tanaka, Kenji Nakao, Tetsuo Fukami
  • Patent number: 8416167
    Abstract: A liquid crystal display device of an OCB mode includes a liquid crystal layer held between an array substrate and a counter-substrate, and a display section composed of display pixels arrayed in a matrix. The array substrate includes pixel electrodes which are disposed in association with the display pixels. The counter-substrate includes a counter-electrode opposed to the pixel electrodes. The substrates include a pair of alignment films which are disposed on the pixel electrodes and the counter-electrode, respectively, and are subjected to rubbing treatment to control an alignment state of liquid crystal molecules included in the layer. A transition-nucleus formation section, which generates an electric field for transitioning the alignment state of the liquid crystal molecules included in the layer from a non-display state to a display state, is provided on a terminal-end side of a rubbing direction of each of the alignment films in each of the display pixels.
    Type: Grant
    Filed: May 24, 2007
    Date of Patent: April 9, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Tetsuo Fukami, Midori Tsukane, Kenji Nakao
  • Patent number: 8411013
    Abstract: A display device includes a circuit which is configured to execute such control that write of a non-video signal in pixels is executed in the first period, write of a video signal in the pixels is executed in the second period which partly overlaps the first period, write of the video signal, in the pixels is executed in the third period which partly overlaps the second period, the write of the non-video signal and the write of the video signal are alternately executed in units of one horizontal cycle or horizontal cycles in a period in which the first period overlaps the second period, and the write of the video signal corresponding to the second period and the third period are alternately executed in units of one horizontal cycle or horizontal cycles in a period in which the second period overlaps the third period.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: April 2, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Yukio Tanaka, Kenji Nakao, Tetsuo Fukami, Kazuhiro Nishiyama
  • Patent number: 8339342
    Abstract: A liquid crystal display device is configured such that a liquid crystal layer is held between a pair of substrates. The liquid crystal display device includes, in a display area including a plurality of pixels, pixel electrodes which are disposed in association with the respective pixels, a counter-electrode which is disposed to be opposed to the pixel electrodes via the liquid crystal layer, scanning lines which are disposed along a row direction of the pixels, signal lines which are disposed along a column direction of the pixels, and an electrically conductive layer which is disposed to be opposed to the counter-electrode via the liquid crystal layer between neighboring ones of the pixel electrodes, and has such a potential as to provide a black display voltage relative to a potential of the counter-electrode.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: December 25, 2012
    Assignee: Japan Display Central Inc.
    Inventor: Tetsuo Fukami
  • Patent number: 8284363
    Abstract: A device includes a substrate including a first insulating substrate, a first electrode located on the first insulating substrate, and a second electrode located between the first insulating substrate and the first electrode via an insulating underlayer interposed between the second and the first electrode, a substrate including a second insulating substrate and a third electrode on the second insulating substrate, a liquid crystal layer which is held between the first and the third electrode and which exhibits a transition from a first state to a second state in an initializing process, and a voltage supply unit which supplies, a first voltage to the first and the second electrodes and a second voltage to the third electrode, wherein the first electrode includes a transition nucleus forming section which forms nuclei of the transition in the liquid crystal layer on the basis of the respective voltages supplied to the respective electrodes.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: October 9, 2012
    Assignees: Japan Display Central Inc., Kabushiki Kaisha Toshiba
    Inventors: Kenji Nakao, Hirofumi Wakemoto, Tetsuya Kojima, Tetsuo Fukami, Yuko Kizu, Rei Hasegawa, Yukio Kizaki
  • Patent number: 8218115
    Abstract: After supply of power, a liquid crystal display device performing transition from a first state to a second state different from the first state before a display operation is provided with a transition nucleus forming portion around a pixel electrode or inside. The transition nucleus forming portion performs transition to the second state prior to other portion during a transition drive period. The transition nucleus forming portion of the pixel electrode has an edge portion formed into a reverse taper shape decreasing in its thickness toward the tip end. Therefore, transition from a splay alignment to a bend alignment is performed with simple element and drive circuit configuration in all pixels.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: July 10, 2012
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Yukio Kizaki, Rei Hasegawa, Yuko Kizu, Hirofumi Wakemoto, Kenji Nakao, Tetsuo Fukami, Tetsuya Kojima
  • Patent number: 8144099
    Abstract: There is provided an liquid crystal display apparatus configured to invert a pixel voltage and a common voltage on a frame to frame basis while setting a transition voltage Vt in such a manner that the polarity of the pixel voltage to be applied to a pixel electrode of each display pixel and the polarity of the common voltage to be applied to a common electrode of a common substrate are differentiated.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: March 27, 2012
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Tetsuya Kojima, Tetsuo Fukami, Kazuhiro Nishiyama, Kenji Nakao
  • Publication number: 20120013830
    Abstract: In one embodiment, a liquid crystal display device includes a first substrate having a first pixel electrode and a first pillar-shaped spacer arranged in an active area, and a second pixel electrode and a second pillar-shaped spacer arranged in a shield area surrounding the active area. A shield layer is formed in the shape of a belt crossing above the first pillar-shaped spacer in the active area and extending to the shield area including a portion above the second pillar-shaped spacer. The height of a first seat layer formed above the first pillar-shaped spacer and including the shield layer, a first color filter layer and an overcoat layer is substantially the same as that of a second seat layer formed above the second pillar-shaped spacer and including the shield layer, a second color filter layer and the overcoat layer.
    Type: Application
    Filed: July 8, 2011
    Publication date: January 19, 2012
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Satoshi ASADA, Daiichi SUZUKI, Tetsuo FUKAMI
  • Patent number: 8031306
    Abstract: A device includes a first substrate including a pixel electrode and an underlayer electrode a part of which is opposed to the pixel electrode, a second substrate including a counter-electrode which is opposed to the pixel electrode, and a layer which is held between the first and the second substrate, and which is in a first state prior to power-on and transitions to a second state, at a time of a display operation, wherein the pixel electrode includes a first part that passes light and a second part that reflects light, the second part includes a projection which is opposed to the counter-electrode, and a transverse electric field generating section, which is provided near the projection so as to generate a transverse electric field between the underlayer electrode and the second part, is disposed at an end portion of the second part, which is opposed to the underlying electrode.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: October 4, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Tetsuo Fukami, Mitsutaka Okita, Kenji Nakao
  • Publication number: 20110149182
    Abstract: In one embodiment, a pair of liquid crystal shutter glasses include a first liquid crystal shutter and a second liquid crystal shutter. The first and second liquid crystal shutters are switched to a transmissive state by turns. The respective first and second liquid crystal shutters include a first electrode substrate and a second electrode substrate opposing the first electrode substrate. An OCB (Optically Compensated Bend) mode liquid crystal layer is held between the first and second electrode substrates. The first electrode substrate includes a first electrode and a second electrode arranged adjacent to the first electrode. The first and second electrodes respectively include a side opposing each other and a plurality of projecting portions provided to the respective opposing sides of the first and second electrodes alternately.
    Type: Application
    Filed: December 21, 2010
    Publication date: June 23, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Tetsuo Fukami, Shigesumi Araki, Tetsuya Kojima, Toshiyuki Higano, Kenji Nakao
  • Publication number: 20110134115
    Abstract: In one embodiment, a display device includes a display panel having pixels. A first image signal for displaying two-dimensional pictures, a second image signal for displaying three-dimensional pictures, and a third image signal for displaying a black picture are written into the pixels. A control circuit writes the third image signal to the pixel of the display panel during at least one frame period when switching a first mode for displaying the two-dimensional pictures and a second mode for displaying the three-dimensional pictures.
    Type: Application
    Filed: December 2, 2010
    Publication date: June 9, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Shigesumi Araki, Kazuhiro Nishiyama, Kenji Nakao, Tetsuo Fukami, Toshiyuki Higano, Daiichi Suzuki, Emi Higano
  • Patent number: 7956832
    Abstract: A liquid crystal display device includes a liquid crystal display panel DP in which liquid crystal pixels PX are connected to a source line X via pixel switching elements, and a display control circuit CNT which performs non-video signal writing for driving the source line X according to a non-video signal and applying the potential of the source line X to one of the liquid crystal pixels PX via a selected one of the pixel switching elements T and performs video signal writing for driving the source line X according to a video signal and applying the potential of the source line X to one of the liquid crystal pixels PX via a selected one of the pixel switching elements T.
    Type: Grant
    Filed: July 5, 2007
    Date of Patent: June 7, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Yukio Tanaka, Tetsuo Fukami
  • Publication number: 20110080535
    Abstract: A liquid crystal shutter includes a first support substrate having a first electrode and a second support substrate having a second electrode opposite to the first electrode. A liquid crystal layer is sandwiched between the first and second electrodes so as to have a switching region. The switching region becomes a bend alignment state from a splay alignment state when a voltage is applied to the liquid crystal layer. A nucleus region formation portion is arranged on the first support substrate to form a nucleus region in the switching region corresponding to the nucleus region formation portion in the liquid crystal layer, in which the splay alignment is more stable than in the switching region.
    Type: Application
    Filed: May 3, 2010
    Publication date: April 7, 2011
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Tetsuya KOJIMA, Toshiyuki Higano, Shigesumi Araki, Tetsuo Fukami, Kazuhiro Nishiyama
  • Patent number: 7894007
    Abstract: A liquid crystal display device includes a liquid crystal display panel having a display section which is composed of a plurality of display pixels, a driving unit which drives the display pixels, and a control unit which controls the driving unit. A first substrate includes pixel electrodes which are disposed in association with the plurality of display pixels. A second substrate includes a counter-electrode which is opposed to the plurality of pixel electrodes. A pair of alignment films are disposed on the plurality of pixel electrodes and the counter-electrode, and control an alignment state of liquid crystal molecules, which are included in the liquid crystal layer, by rubbing treatment. Dummy display pixels are disposed on a terminal end side of the display section in a rubbing direction. A driving unit includes circuit for cyclically applying a reverse transition prevention signal to the dummy display pixels.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: February 22, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Tetsuo Fukami, Yukio Tanaka, Masaki Miyatake, Hiroshi Azuma, Kenji Nakao
  • Patent number: 7880716
    Abstract: A liquid crystal display device includes liquid crystal pixels, signal line groups each including a predetermined number of signal lines, and a drive circuit which selects the pixels on a row-by-row basis and drives the pixels of the selected row via the signal lines. The drive circuit includes a signal line driver which outputs a predetermined number of pixel voltages for each group driving period while the pixels of each row are being selected, a multiplexer which distributes to each signal line group the pixel voltages output from the signal line driver, and a controller which controls the multiplexer to electrically connect all of the signal line groups to the signal line driver and electrically disconnect the signal line groups one by one from the signal line driver for each group driving period, in a selection period of the pixels of an initial row that requires polarity inversion.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: February 1, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Yukio Tanaka, Tetsuo Fukami
  • Publication number: 20100289786
    Abstract: A liquid crystal display device includes a display portion having a first substrate, a second substrate opposing to the first substrate, a liquid crystal layer held between the first and second substrates, and a plurality of pixels arranged in a delta shape. A plurality of pixel electrodes are respectively connected to signal lines extending in a first direction via a switch. The switch is controlled by scanning lines extending in a second direction which orthogonally crosses the first direction. The signal lines extend in a space between the pixel electrodes in a meandering shape in the second direction, and two kinds of color pixels are connected with a common signal line in turn via the pixel switch.
    Type: Application
    Filed: April 30, 2010
    Publication date: November 18, 2010
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Yukio TANAKA, Tetsuo Fukami, Emi Higano, Shigesumi Araki, Ken Shiiba