Patents by Inventor Takato Hiratsuka

Takato Hiratsuka 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: 8673545
    Abstract: In a method of manufacturing a liquid crystal display device in which a plurality of pixels are arranged in a matrix, each of the pixels has an insulator wall structure at a boundary of the pixels, and a wall electrode is provided at least at a side of the wall structure, the wall structure being formed by: using a chemically amplified resist as a material of the wall structure, a step of applying the chemically amplified resist; a step of exposing and developing the chemically amplified resist; a step of irradiating light on an entire surface to perform post exposure; a step of pre-calcinating the chemically amplified resist at a temperature lower than a main calcination temperature; and a step of performing main calcination at a temperature higher than a pre-calcination temperature.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 18, 2014
    Assignee: Japan Display East Inc.
    Inventors: Toshimasa Ishigaki, Daisuke Sonoda, Masanao Yamamoto, Osamu Itou, Takato Hiratsuka
  • Publication number: 20140036209
    Abstract: In a liquid crystal display device having wall structures, the generation of low-temperature shock bubbles is suppressed. Also, electrodes and the like within substrates are prevented from being damaged during manufacturing. The liquid crystal display device includes a first substrate, a second substrate that is disposed to face the first substrate, a liquid crystal layer that is disposed between the first substrate and the second substrate, wall structures that are formed on the first substrate, pixel electrodes that are disposed on at least side wall of the wall structures, a common electrode that is formed on the first substrate, and a plurality of pixels including the pixel electrodes and the common electrode, in which higher portions are partially disposed on a surface of the second substrate, and the higher portions come into contact with the wall structures to bring the first substrate into contact with the second substrate.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 6, 2014
    Applicant: Japan Display Inc.
    Inventors: Takato HIRATSUKA, Osamu ITOU, Miharu OTANI, Toshimasa ISHIGAKI, Daisuke SONODA
  • Publication number: 20130342778
    Abstract: A wall electrode IPS mode LCD has stabilized domain boundary. Signal and scanning lines extend in first and second directions, respectively, surrounding a pixel. A first wall structure has a first portion intersecting the first direction at a first angle, a second portion in the same direction, and a third portion intersecting the first direction at a second angle. The second portion has a first projection in the direction of a second wall structure, and a second projection in the same direction. The second wall structure has a fourth portion intersecting the first direction at the first angle, a fifth portion in the same direction as the first direction, and a sixth portion intersecting the first direction at the second angle. A distance between the first projection and the fifth portion is shorter than a distance between the first wall structure except the first projection and the second wall structure.
    Type: Application
    Filed: June 24, 2013
    Publication date: December 26, 2013
    Inventors: Osamu ITOU, Takato HIRATSUKA
  • Publication number: 20130329146
    Abstract: A liquid crystal display device has a TFT substrate, a color filter (CF) substrate, a liquid crystal layer, wall structures formed on the TFT substrate, pixel electrodes provided on at least the sides of the wall structures, and common electrodes and counter electrodes formed on the TFT substrate and on the CF substrate to face each other, and a number of pixels are provided to include the TFT substrate, the CF substrate and the liquid crystal layer, wherein a light blocking region is provided around each of the number of pixels, each wall structure is arranged in the light blocking region, a support formed of a transparent and elastic material is arranged on an upper surface of each wall structure, the CF substrate is supported by the supports, and the liquid crystal layer is driven by electrical fields generated by the pixel electrodes, the common electrodes and the counter electrodes.
    Type: Application
    Filed: June 12, 2013
    Publication date: December 12, 2013
    Inventors: Miharu OTANI, Takato HIRATSUKA, Osamu ITOU
  • Publication number: 20130323997
    Abstract: Provided is a method of manufacturing a display device that includes a structure formed so as to protrude at least in a normal direction of a first substrate, and an electrode formed in a side wall surface of the structure, the method including: forming a transparent conductive film for the electrode; forming a low-affinity material having a low affinity for a resist film on an upper surface of the transparent conductive film formed in a head surface of the structure; forming a resist film by applying a liquid resist material to an upper layer of the transparent conductive film and then fixing the resist material; forming an opening that exposes the transparent conductive film in the resist film by removing the low-affinity material; etching the transparent conductive film which is a lower layer using the resist film as a protective film; and removing the resist film.
    Type: Application
    Filed: March 27, 2013
    Publication date: December 5, 2013
    Applicant: Japan Display East Inc.
    Inventors: Masanao YAMAMOTO, Daisuke SONODA, Osamu ITOU, Takato HIRATSUKA
  • Patent number: 8570462
    Abstract: Provided is a liquid crystal display device including: a liquid crystal cell (15) including a first substrate (110), a second substrate (111), and a liquid crystal layer (160) sealed between the first substrate and the second substrate; a first polarization member (210) for transmitting light in a predetermined polarization direction; and a second polarization member (220) for transmitting light in another polarization direction which is orthogonal to the predetermined polarization direction. At least one of the first polarization member and the second polarization member includes a multilayer thin film polarizer including a plurality of thin film polarizers which are stacked so that transmission axes of the plurality of thin film polarizers are aligned. The multilayer thin film polarizer includes a thin film polarizer formed in a predetermined film thickness by coating with dye molecules which are aligned by a shear stress.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: October 29, 2013
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takato Hiratsuka, Masaya Adachi, Miharu Otani, Jun Tanaka, Chie Yoshizawa
  • Publication number: 20130280661
    Abstract: In a method of manufacturing a liquid crystal display device in which a plurality of pixels are arranged in a matrix, each of the pixels has an insulator wall structure at a boundary of the pixels, and a wall electrode is provided at least at a side of the wall structure, the wall structure being formed by: using a chemically amplified resist as a material of the wall structure, a step of applying the chemically amplified resist; a step of exposing and developing the chemically amplified resist; a step of irradiating light on an entire surface to perform post exposure; a step of pre-calcinating the chemically amplified resist at a temperature lower than a main calcination temperature; and a step of performing main calcination at a temperature higher than a pre-calcination temperature.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 24, 2013
    Applicant: JAPAN DISPLAY EAST INC.
    Inventors: Toshimasa ISHIGAKI, Daisuke SONODA, Masanao YAMAMOTO, Osamu ITOU, Takato HIRATSUKA
  • Publication number: 20130265534
    Abstract: The liquid crystal display device includes a pixel structure provided with a large wall formed along a long side of a pixel with a rectangular plane, a small wall formed at a center of the pixel and extending in the same direction as the large wall, a wall electrode formed on a wall surface of the large wall, a plane electrode formed between the small and large walls, in which the wall electrode and the plane electrode form a pixel electrode, and a common electrode formed on a surface of the small wall. The large wall has a part with an increased thickness at an end part of the pixel. The wall electrode is bent toward the center of the pixel. This structure prevents decrease of reverse twist of liquid crystal at an end part of the pixel as well as generation of domain, thus improving the transmittance of the screen.
    Type: Application
    Filed: March 8, 2013
    Publication date: October 10, 2013
    Applicant: JAPAN DISPLAY EAST INC.
    Inventors: Takato HIRATSUKA, Osamu ITOU, Masanao YAMAMOTO, Daisuke SONODA
  • Publication number: 20130250199
    Abstract: The present invention provides a liquid crystal display device including: plural pixels disposed in a matrix shape, each pixel having insulating wall-shaped structures at the boundaries of the pixels and a small wall-shaped structure between the wall-shaped structures; wall electrodes, each having wall-shaped electrodes formed on the side faces of the wall-shaped structures, and planar electrodes that are connected to the wall-shaped electrodes and extend in the planar direction; electrodes, each having a TFT-side electrode covering the small wall-shaped structure and a storage capacitor electrode that is connected to the TFT-side electrode and extends in the planar direction of the substrate; and interlayer insulating films formed between the storage capacitor electrodes and the planar electrodes. And the interlayer insulating films of inorganic films are not formed on the upper and side faces and at the base portions of the wall-shaped structures at the boundaries of the pixels.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 26, 2013
    Applicant: JAPAN DISPLAY EAST INC.
    Inventors: Takato HIRATSUKA, Osamu ITOU, Masanao YAMAMOTO, Daisuke SONODA, Toshimasa ISHIGAKI
  • Publication number: 20130033653
    Abstract: There is provided a liquid crystal display device including a first capacitive electrode and a second capacitive electrode. Among the capacitive electrodes, a side edge portion of the first capacitive electrode formed in a level, which is closer to the liquid crystal layer, on the side of the pixel display portion is formed so as to be further retreated than a side edge portion of the second capacitive electrode formed in a level, which is further from the liquid crystal layer, on the side of the pixel display portion. A second convex formed in a region overlapping with a corner and a side edge portion of the retreating region or a region between a side edge portion of the retreating region and the other capacitive electrode and extending in a shorter-side direction of the pixel is further provided.
    Type: Application
    Filed: July 31, 2012
    Publication date: February 7, 2013
    Inventors: Takato HIRATSUKA, Osamu Itou
  • Publication number: 20130016314
    Abstract: A liquid crystal display device having a second substrate and a first substrate that is placed so as to face the above-described second substrate with pixel regions aligned in a matrix is provided with: protrusions that are formed on pixel boarders and protrude from the second substrate on the liquid crystal side; first electrodes made of sidewall electrodes formed on sidewalls of protrusions and a lower end side electrode extending from the sidewall electrodes on the bottom side; and second electrodes made of a first linear electrode formed within a pixel region and a second linear electrode that is formed on the second substrate and faces the first linear electrode.
    Type: Application
    Filed: July 12, 2012
    Publication date: January 17, 2013
    Inventors: Osamu ITOU, Takato Hiratsuka
  • Patent number: 8294852
    Abstract: An E-type polarizing layer is provided between a pair of orthogonally oriented O-type polarizing layers, and alternatively, an O-type polarizing layer and an E-type polarizing layer which are oriented orthogonal to each other are provided. When a liquid crystal layer has a slow axis, the E-type polarizing layer is disposed so that an absorption axis thereof is orthogonal to the slow axis. Therefore, a liquid crystal display device having a wide viewing angle is realized in which a contrast ratio is improved by suppressing a light leakage occurring when observed from an oblique direction.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: October 23, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masaya Adachi, Takato Hiratsuka
  • Publication number: 20120257156
    Abstract: A liquid crystal display device includes a first substrate provided with first and second electrodes, and a second substrate disposed to be opposite to the first substrate via a liquid crystal layer. Regions of pixels each having the first and second electrodes are arranged in a matrix, and the liquid crystal layer is driven by an electric field in an in-plane direction of the first substrate, applied between the first and second electrodes. A step difference is formed at an opposite side of the first substrate for each of the pixel regions. The first or second electrode includes a wall-shaped electrode formed at a side wall surface of the step difference and a planar electrode formed from an edge of the wall-shaped electrode along the main surface of the first substrate. The wall-shaped electrode and the planar electrode are electrically connected to each other.
    Type: Application
    Filed: March 27, 2012
    Publication date: October 11, 2012
    Inventors: Takato HIRATSUKA, Osamu Itou, Shinichiro Oka, Shinichi Komura
  • Patent number: 8237895
    Abstract: In a transflective liquid crystal display device including a transmission display portion and a reflection display portion, a dichroic ratio of a polarizing layer contained in a reflection region is increased to enhance display performance. The liquid crystal display device includes: the transmission display portion and the reflection display portion which are formed for each pixel; a reflective layer formed in the reflection display portion; a first substrate having a principal surface opposed to a liquid crystal layer; a second substrate opposed to the first substrate via the liquid crystal layer; and a polarizing layer formed above the reflective layer via an underlying layer thereof on the principal surface of the first substrate. The polarizing layer is made of chromonic liquid crystalline molecules, and an interface between the polarizing layer and the underlying layer has one of a siloxane structure and a silazane structure.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: August 7, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Miharu Otani, Jun Tanaka, Kazuhito Masuda, Masaya Adachi, Takato Hiratsuka
  • Patent number: 8154693
    Abstract: An object of the present invention is to increase the dichroic ratio of the built-in polarizing layer in reflective regions so that the display performance improves in a semi-transmission type liquid crystal display device having a transmissive display portion and a reflective display portion.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: April 10, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Miharu Otani, Jun Tanaka, Kazuhito Masuda, Masaya Adachi, Takato Hiratsuka
  • Publication number: 20120021143
    Abstract: A display device capable of improving the contrast ratio and having a polarizing layer formed by applying shear stress to a material containing a dye having a lyotropic liquid crystallinity to align the molecule of the dye, wherein the display device has an underlayer film forming a base for the polarizing layer, the molecule of the dye has a sulfo group, and the underlayer film comprises a material having a basic surface functional group.
    Type: Application
    Filed: July 20, 2011
    Publication date: January 26, 2012
    Inventors: Takato HIRATSUKA, Masaya Adachi, Osamu Itou
  • Publication number: 20110194052
    Abstract: In a display device which includes: a first substrate; a second substrate; and a thin film polarizer which is directly formed on a surface of the second substrate on a side opposite to the first substrate, the thin film polarizer includes a polarization element film and a protection layer which is laminated to the polarization element film, the polarization element film is made of an aligned lyotropic liquid crystal material, and the protection layer has a refractive index smaller than a refractive index of the polarization element film in a transmission axis direction. The protection layer may have a thickness smaller than a thickness of polarization element film.
    Type: Application
    Filed: February 8, 2011
    Publication date: August 11, 2011
    Inventors: Takato Hiratsuka, Masaya Adachi, Hiroshi Sasaki, Miharu Otani
  • Publication number: 20110058128
    Abstract: An E-type polarizing layer is provided between a pair of orthogonally oriented O-type polarizing layers, and alternatively, an O-type polarizing layer and an E-type polarizing layer which are oriented orthogonal to each other are provided. When a liquid crystal layer has a slow axis, the E-type polarizing layer is disposed so that an absorption axis thereof is orthogonal to the slow axis. Therefore, a liquid crystal display device having a wide viewing angle is realized in which a contrast ratio is improved by suppressing a light leakage occurring when observed from an oblique direction.
    Type: Application
    Filed: August 20, 2010
    Publication date: March 10, 2011
    Inventors: Masaya Adachi, Takato Hiratsuka
  • Publication number: 20110007243
    Abstract: Provided is a liquid crystal display device including a liquid crystal panel including: a first substrate on which a plurality of drain lines and a plurality of gate lines are formed, the plurality of gate lines crossing the plurality of drain lines; a second substrate which is arranged opposite to the first substrate via a liquid crystal; and an optical anisotropic film formed on a side of one of the first substrate and the second substrate, the side not being in contact with the liquid crystal; in which a region surrounded by the plurality of drain lines and the plurality of gate lines serves as a pixel region, in which the optical anisotropic film is formed of molecules which chemically bond to one of the first substrate and the second substrate in an aligned state.
    Type: Application
    Filed: June 3, 2010
    Publication date: January 13, 2011
    Inventors: Jun Tanaka, Miharu Otani, Masaya Adachi, Takato Hiratsuka
  • Publication number: 20100259708
    Abstract: Provided is a liquid crystal display device including: a liquid crystal cell (15) including a first substrate (110), a second substrate (111), and a liquid crystal layer (160) sealed between the first substrate and the second substrate; a first polarization member (210) for transmitting light in a predetermined polarization direction; and a second polarization member (220) for transmitting light in another polarization direction which is orthogonal to the predetermined polarization direction. At least one of the first polarization member and the second polarization member includes a multilayer thin film polarizer including a plurality of thin film polarizers which are stacked so that transmission axes of the plurality of thin film polarizers are aligned. The multilayer thin film polarizer includes a thin film polarizer formed in a predetermined film thickness by coating with dye molecules which are aligned by a shear stress.
    Type: Application
    Filed: April 13, 2010
    Publication date: October 14, 2010
    Inventors: Takato HIRATSUKA, Masaya Adachi, Miharu Otani, Jun Tanaka, Chie Yoshizawa