Patents by Inventor Hirofumi Wakemoto

Hirofumi Wakemoto 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: 20190113786
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a sealant, a liquid crystal layer, an organic insulating film, an alignment film and an inorganic insulating film. The second substrate is opposed to the first substrate. The sealant attaches the first substrate and the second substrate to each other. The liquid crystal layer is arranged between the first substrate and the second substrate. The organic insulating film, the alignment film and the inorganic insulating film are provided on the first substrate. The alignment film contacts the liquid crystal layer. The inorganic insulating film is located between the alignment film and the organic insulating film. At least pan of the alignment film contacts the organic insulating film.
    Type: Application
    Filed: December 12, 2018
    Publication date: April 18, 2019
    Applicant: Japan Display Inc.
    Inventors: Tetsuya KOJIMA, Hirofumi Wakemoto, Mitsutaka Okita, Daiichi Suzuki
  • Patent number: 10197858
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a sealant, a liquid crystal layer, an organic insulating film, an alignment film and an inorganic insulating film. The second substrate is opposed to the first substrate. The sealant attaches the first substrate and the second substrate to each other. The liquid crystal layer is arranged between the first substrate and the second substrate. The organic insulating film, the alignment film and the inorganic insulating film are provided on the first substrate. The alignment film contacts the liquid crystal layer. The inorganic insulating film is located between the alignment film and the organic insulating film. At least part of the alignment film contacts the organic insulating film.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: February 5, 2019
    Assignee: Japan Display Inc.
    Inventors: Tetsuya Kojima, Hirofumi Wakemoto, Mitsutaka Okita, Daiichi Suzuki
  • Publication number: 20180217423
    Abstract: According to one embodiment, the organic insulating film and the alignment film are provided on the first substrate. The alignment film is located between the liquid crystal layer and the organic insulating film and contacts the liquid crystal layer. The organic insulating film has a restricting portion on an inner side from the sealant and on an outer side from the display area. The restricting portion includes a recess and a projection extending in predetermined directions. The alignment film is formed on the restricting portion.
    Type: Application
    Filed: January 30, 2018
    Publication date: August 2, 2018
    Applicant: Japan Display Inc.
    Inventors: Daiichi SUZUKI, Hirofumi WAKEMOTO, Mitsutaka OKITA, Tetsuya KOJIMA
  • Publication number: 20180217422
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a sealant, a liquid crystal layer, an organic insulating film, an alignment film and an inorganic insulating film. The second substrate is opposed to the first substrate. The sealant attaches the first substrate and the second substrate to each other. The liquid crystal layer is arranged between the first substrate and the second substrate. The organic insulating film, the alignment film and the inorganic insulating film are provided on the first substrate. The alignment film contacts the liquid crystal layer. The inorganic insulating film is located between the alignment film and the organic insulating film. At least part of the alignment film contacts the organic insulating film.
    Type: Application
    Filed: January 22, 2018
    Publication date: August 2, 2018
    Applicant: Japan Display Inc.
    Inventors: Tetsuya Kojima, Hirofumi Wakemoto, Mitsutaka Okita, Daiichi Suzuki
  • Patent number: 9959823
    Abstract: According to one embodiment, a liquid crystal display device includes an array substrate, a counter substrate, a liquid crystal layer and a driving unit. The driving unit is configured to perform polarity inversion driving by applying, to the pixel electrode, positive and negative video signals. When applying the video signals to the pixel electrode, the driving unit superposes a correction signal corresponding to a polarity inversion frequency and the gray level on the video signals in advance.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: May 1, 2018
    Assignee: JAPAN DISPLAY INC.
    Inventors: Yukio Tanaka, Toshiyuki Higano, Kenji Nakao, Hirofumi Wakemoto
  • Patent number: 9824655
    Abstract: According to one embodiment, a display device includes a display panel including a gate line, source lines, and switching elements connected to the gate line and the respective source lines. A gate driver selects the gate line. A source driver supplies an image signal to the source lines. The image signals can be supplied to pixel electrodes through the switching elements. A frame period includes a first scan period in which the gate line is selected, a first hold period subsequent to the first scan period, a second scan period in which the gate line is selected subsequent to the first hold period, and a second hold period subsequent to the second scan period. The first hold period is longer than the second hold period.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: November 21, 2017
    Assignee: Japan Display Inc.
    Inventors: Daiichi Suzuki, Yukio Tanaka, Hirofumi Wakemoto
  • Publication number: 20160284291
    Abstract: According to one embodiment, a liquid crystal display device includes an array substrate, a counter substrate, a liquid crystal layer and a driving unit. The driving unit is configured to perform polarity inversion driving by applying, to the pixel electrode, positive and negative video signals. When applying the video signals to the pixel electrode, the driving unit superposes a correction signal corresponding to a polarity inversion frequency and the gray level on the video signals in advance.
    Type: Application
    Filed: June 8, 2016
    Publication date: September 29, 2016
    Applicant: Japan Display Inc.
    Inventors: Yukio Tanaka, Toshiyuki Higano, Kenji Nakao, Hirofumi Wakemoto
  • Publication number: 20160210922
    Abstract: According to one embodiment, a display device includes a display panel including a gate line, source lines, and switching elements connected to the gate line and the respective source lines. A gate driver selects the gate line. A source driver supplies an image signal to the source lines. The image signals can be supplied to pixel electrodes through the switching elements. A frame period includes a first scan period in which the gate line is selected, a first hold period subsequent to the first scan period, a second scan period in which the gate line is selected subsequent to the first hold period, and a second hold period subsequent to the second scan period. The first hold period is longer than the second hold period.
    Type: Application
    Filed: January 8, 2016
    Publication date: July 21, 2016
    Applicant: Japan Display Inc.
    Inventors: Daiichi SUZUKI, Yukio TANAKA, Hirofumi WAKEMOTO
  • Patent number: 9390673
    Abstract: According to one embodiment, a liquid crystal display device includes an array substrate, a counter substrate, a liquid crystal layer and a driving unit. The driving unit is configured to perform polarity inversion driving by applying, to the pixel electrode, positive and negative video signals. When applying the video signals to the pixel electrode, the driving unit superposes a correction signal corresponding to a polarity inversion frequency and the gray level on the video signals in advance.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: July 12, 2016
    Assignee: Japan Display Inc.
    Inventors: Yukio Tanaka, Toshiyuki Higano, Kenji Nakao, Hirofumi Wakemoto
  • Publication number: 20150109569
    Abstract: An object of the present invention is to realize a liquid crystal display device having a photo-aligned alignment film in which the alignment film is overlapped with a seal material to downsize a frame area, and the reliability of a seal portion can be secured. A first alignment film and a second alignment film are overlapped with a seal material, the first alignment film and the second alignment film are made of material containing 0.5 wt % or larger and 2 wt % or smaller of an amine-system silane coupling agent, and the shrinkage ratio and the storage elastic modulus of the seal material evaluated using the modulus of volume change by a specific gravity cup method are 5.1% or smaller and 9.2 Pa or smaller, respectively. Accordingly, a frame area can be downsized, and the reliability of a seal portion can be maintained.
    Type: Application
    Filed: October 21, 2014
    Publication date: April 23, 2015
    Inventors: Noboru KUNIMATSU, Yasushi TOMIOKA, Toshiyuki HIGANO, Emi HIGANO, Midori TSUKANE, Hirofumi WAKEMOTO, Kazuhiro NISHIYAMA
  • Patent number: 8848148
    Abstract: According to one embodiment, a liquid crystal display device includes, a first substrate including a common electrode, a pixel electrode in which a slit facing the common electrode is formed, and a first alignment film, a second substrate including a second alignment film, and a liquid crystal layer which is held between the first alignment film and the second alignment film and is formed of a material having a dielectric constant anisotropy in a range of +3.3 or more to +5.3 or less at a transition temperature of 75° C.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: September 30, 2014
    Assignee: Japan Display Inc.
    Inventors: Youichi Asakawa, Hirofumi Wakemoto
  • Publication number: 20140085356
    Abstract: According to one embodiment, a liquid crystal display device includes an array substrate, a counter substrate, a liquid crystal layer and a driving unit. The driving unit is configured to perform polarity inversion driving by applying, to the pixel electrode, positive and negative video signals. When applying the video signals to the pixel electrode, the driving unit superposes a correction signal corresponding to a polarity inversion frequency and the gray level on the video signals in advance.
    Type: Application
    Filed: September 20, 2013
    Publication date: March 27, 2014
    Applicant: Japan Display Inc.
    Inventors: Yukio TANAKA, Toshiyuki HIGANO, Kenji NAKAO, Hirofumi WAKEMOTO
  • Publication number: 20130100384
    Abstract: According to one embodiment, a liquid crystal display device includes, a first substrate including a common electrode, a pixel electrode in which a slit facing the common electrode is formed, and a first alignment film, a second substrate including a second alignment film, and a liquid crystal layer which is held between the first alignment film and the second alignment film and is formed of a material having a dielectric constant anisotropy in a range of +3.3 or more to +5.3 or less at a transition temperature of 75° C.
    Type: Application
    Filed: September 12, 2012
    Publication date: April 25, 2013
    Inventors: Youichi ASAKAWA, Hirofumi WAKEMOTO
  • 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: 7746437
    Abstract: A liquid crystal display includes an insulating substrate, an alignment layer covering a main surface of the insulating substrate, and electrodes interposed therebetween. The alignment layer defines an alignment direction parallel to the main surface, an upstream side as one end's side of the alignment direction, and a downstream side as another end's side of the alignment direction, and tilts liquid crystal molecules toward the downstream side. Each electrode includes an upstream section that includes a first edge facing the upstream side and a downstream section that includes a second edge facing the downstream side and is provided with a recess recessed relative to the second edge. The first recess forms on the downstream section a third edge extending in the alignment direction and a fourth edge connecting the third edge to the second edge and facing the upstream side.
    Type: Grant
    Filed: February 7, 2008
    Date of Patent: June 29, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuko Kizu, Yukio Kizaki, Rei Hasegawa, Hirofumi Wakemoto, Kenji Nakao, Tetsuya Kojima, Tetsuo Fukami
  • Publication number: 20090197018
    Abstract: A liquid crystal layer is formed of a liquid crystal composition including at least one of a compound A which includes a compound of two 6-membered rings in a main skeleton, one of the 6-membered rings being a benzene ring and the other of the 6-membered rings being a cyclohexane ring, and which is expressed by a general formula (1), and a compound B in which both of the two 6-membered rings are cyclohexane rings, and which is expressed by a general formula (2), (each of R and R? represents an alkyl group or an alkenyl group with a carbon atom number of 2 to 5, and a case in which R and R? are identical is included).
    Type: Application
    Filed: February 3, 2009
    Publication date: August 6, 2009
    Inventors: Midori TSUKANE, Hirofumi Wakemoto
  • Publication number: 20090079925
    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: Application
    Filed: September 17, 2008
    Publication date: March 26, 2009
    Inventors: Yukio KIZAKI, Rei Hasegawa, Yuko Kizu, Hirofumi Wakemoto, Kenji Nakao, Tetsuo Fukami, Testuya Kojima
  • Publication number: 20090079675
    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: Application
    Filed: September 24, 2008
    Publication date: March 26, 2009
    Inventors: Kenji Nakao, Hirofumi Wakemoto, Tetsuya Kojima, Tetsuo Fukami, Yuko Kizu, Rei Hasegawa, Yukio Kizaki
  • Patent number: 7483104
    Abstract: An OCB mode liquid crystal display panel comprises a pair of electrode substrates, a liquid crystal layer which is held between the pair of electrode substrates and has liquid crystal molecules whose alignment state is controlled within a display area by a drive voltage applied from the electrode substrates, and a pair of alignment films which are disposed on the electrode substrates in contact with the liquid crystal layer and whose rubbing directions are set parallel to each other. The display area includes a plurality of pixels arrayed in a matrix, and the rubbing directions of the alignment films are substantially opposite to a scanning direction in which rows of the pixels are sequentially selected for application of the drive voltage in a display operation.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: January 27, 2009
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Kenji Nakao, Shinji Ogawa, Naoya Kubota, Hirofumi Wakemoto