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: 9244312
    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: Grant
    Filed: June 12, 2013
    Date of Patent: January 26, 2016
    Assignee: JAPAN DISPLAY INC.
    Inventors: Miharu Otani, Takato Hiratsuka, Osamu Itou
  • Publication number: 20160004135
    Abstract: A provided is a liquid crystal display device with a high definition screen and less color mixture. On an array substrate, a pixel is formed between the adjacent video signal lines, a color filter is formed within the pixel, a flattening film is formed on the color filter, a lower layer is formed on the flattening film, and an upper layer having a slit is formed on the lower layer with an interlayer insulating film interposed therebetween; and on the array substrate, an opposite substrate is arranged with a liquid crystal layer interposed therebetween. When a distance from the top of the video signal line working as a light shielding film to the bottom of the liquid crystal layer is defined as d and a space between the centers of the video signal lines separating the pixel is defined as w, a relation of d?0.3 w is satisfied.
    Type: Application
    Filed: July 2, 2015
    Publication date: January 7, 2016
    Inventors: Kenji NAKAO, Osamu Itou, Toshimasa Ishigaki, Daisuke Sonoda, Takato Hiratsuka
  • Patent number: 9229285
    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: Grant
    Filed: March 27, 2013
    Date of Patent: January 5, 2016
    Assignee: JAPAN DISPLAY INC.
    Inventors: Masanao Yamamoto, Daisuke Sonoda, Osamu Itou, Takato Hiratsuka
  • Patent number: 9223067
    Abstract: A display device includes a first substrate, a second substrate, a first polarization element film which is directly formed on a surface of the second substrate on a side opposite to a side where the first substrate is arranged, and a first polarization layer which is formed in contact with a surface of the first polarization element film on a side opposite to a side where the second substrate is arranged. The first polarization element film is made of an aligned lyotropic liquid crystal material, and the first protective layer is made of a material having a refractive index smaller than a refractive index of the first polarization element film in a transmission axis direction, and has a thickness smaller than a thickness of the first polarization element film.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: December 29, 2015
    Assignees: JAPAN DISPLAY INC., PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventors: Takato Hiratsuka, Masaya Adachi, Hiroshi Sasaki, Miharu Otani
  • Publication number: 20150205159
    Abstract: A display device includes a light source, a substrate transparent to a light source light, a pixel portion disposed at a side irradiated with the light source light, and a light extraction structure for extracting the light from the pixel portion to the outside. The light extraction structure includes a wall-like structure and a reflection layer. The pixel portion includes a laminated film formed by laminating the wavelength conversion layer for emitting fluorescent light through radiation of the light source light, and an excitation light absorbing layer disposed between the wavelength conversion layer and the substrate. The laminated film is disposed in the region partitioned by walls of the wall-like structure.
    Type: Application
    Filed: January 21, 2015
    Publication date: July 23, 2015
    Applicant: Japan Display Inc.
    Inventors: Osamu ITOU, Takato HIRATSUKA
  • Patent number: 9063384
    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 first direction, and a third portion intersecting the first direction at a second angle. The second portion has a first projection in the second direction. The second wall structure has a fourth portion intersecting the first direction at the first angle, a fifth portion in the first direction, and a sixth portion intersecting the first direction at the second angle. The fifth portion has a second projection in the second direction. 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: Grant
    Filed: June 24, 2013
    Date of Patent: June 23, 2015
    Assignee: Japan Display Inc.
    Inventors: Osamu Itou, Takato Hiratsuka
  • Publication number: 20150124209
    Abstract: In an LCD device, the slope angle of a wall surface of a wall structure (wall-surface slope angle) is varied in accordance with the angle formed between the wall structure and an alignment treatment direction (alignment treatment angle). At places where the alignment treatment angle is small, the wall-surface slope angle is made larger; conversely, at places where the alignment treatment angle is large, the wall-surface slope angle is made smaller.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 7, 2015
    Inventors: Osamu ITOU, Takato HIRATSUKA, Toshimasa ISHIGAKI, Daisuke SONODA
  • Publication number: 20150124207
    Abstract: In an LCD device having wall electrodes, four kinds of pixels are used that impart different alignment properties to the liquid crystal molecules. Specifically, the LC molecules are aligned such that: the LC molecules in first pixels twist clockwise and rise in a plus direction; the LC molecules in second pixels twist clockwise and rise in a minus direction; the LC molecules in third pixels twist counterclockwise and rise in the plus direction; and the LC molecules in fourth pixels twist counterclockwise and rise in the minus direction. The pixels of the same type are arranged in rows such that their long sides are adjacent to one another.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 7, 2015
    Inventors: Osamu ITOU, Takato HIRATSUKA, Toshimasa ISHIGAKI, Daisuke SONODA
  • Publication number: 20150103295
    Abstract: A display device includes a first substrate, a second substrate, a first polarization element film which is directly formed on a surface of the second substrate on a side opposite to a side where the first substrate is arranged, and a first polarization layer which is formed in contact with a surface of the first polarization element film on a side opposite to a side where the second substrate is arranged. The first polarization element film is made of an aligned lyotropic liquid crystal material, and the first protective layer is made of a material having a refractive index smaller than a refractive index of the first polarization element film in a transmission axis direction, and has a thickness smaller than a thickness of the first polarization element film.
    Type: Application
    Filed: December 23, 2014
    Publication date: April 16, 2015
    Inventors: Takato Hiratsuka, Masaya Adachi, Hiroshi Sasaki, Miharu Otani
  • Publication number: 20150098048
    Abstract: A liquid crystal display device includes a TFT substrate, a CF substrate, and a liquid crystal interposed between the TFT substrate and the CF substrate, and drives the liquid crystal in a horizontal electric field. The TFT substrate includes a recess, and the CF substrate includes a columnar protrusion. The protrusion of the CF substrate is fitted to the recess of the TFT substrate so as to function as a stopper for preventing a positional gap between the TFT substrate and the CF substrate.
    Type: Application
    Filed: October 7, 2014
    Publication date: April 9, 2015
    Inventors: Yasushi TOMIOKA, Takato HIRATSUKA, Osamu ITOU
  • Patent number: 8994905
    Abstract: The liquid crystal display device is provided with: a pair of first electrodes in wall form that at least partially overlap a pair of first structures; and a second electrode sandwiched between the pair of first electrodes, wherein the first electrodes are formed of: a wall electrode that is formed on a sidewall surface of the structure, protruding so as to be in a wall form in a direction of a normal to the first substrate and running in the longitudinal direction of the pixel; and a plane electrode that runs in a plane direction of the first substrate from a side of the wall electrode on the first substrate side in such a manner that an end portion thereof runs in proximity to the second electrode, and at least either the plane electrode or the second electrode covers the pixel display region.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: March 31, 2015
    Assignee: Japan Display Inc.
    Inventors: Takato Hiratsuka, Osamu Itou
  • Publication number: 20150085232
    Abstract: Pixel electrodes and a common electrode are formed on a first panel. A wall is formed on the first panel. The wall includes a large insulating wall that is made of an insulating material and projects toward a second panel, and a wall electrode part that covers a side wall of the large insulating wall and functions as the pixel electrode or the common electrode. The wall includes a side surface on which an alignment film that defines an alignment of liquid crystal molecules of a liquid crystal layer is formed. The side wall of the wall is inclined with respect to a direction perpendicular to the first panel and the second panel. With this configuration, in a liquid crystal display device having the wall electrode, light leakage at the time of displaying a black image can be reduced.
    Type: Application
    Filed: September 19, 2014
    Publication date: March 26, 2015
    Inventors: Takato HIRATSUKA, Osamu ITOU, Daisuke SONODA, Toshimasa ISHIGAKI
  • Publication number: 20150085218
    Abstract: The present invention provides a high-definition, high-contrast, and high-aperture-ratio liquid crystal display device that prevents light leakage near wall electrodes. There is provided a liquid crystal display device including: two parallel wall electrodes that are disposed on the both sides of a pixel; an opposite electrode that is disposed in the middle between the two parallel wall electrodes; and a photo-alignment film, wherein the initial alignment direction of liquid crystal of the photo-alignment film is substantially parallel to or orthogonal to the stretching direction of the two parallel wall electrodes, and the opposite electrode is inclined only by a predetermined bias angle relative to the initial alignment direction of liquid crystal.
    Type: Application
    Filed: September 19, 2014
    Publication date: March 26, 2015
    Inventors: Yasushi TOMIOKA, Takato HIRATSUKA, Osamu ITOU
  • Patent number: 8964154
    Abstract: A liquid crystal display device using a wall electrode facilitates enclosing of liquid crystal and improves transmittance. The liquid crystal display device includes a plurality of pixels arranged in a matrix. Each of the pixels includes large walls, a small wall, a TFT-side electrode, and a wall electrode. The large walls extend in a long-side direction of the pixel at both ends of the pixel. The small wall extends parallel to the large walls between the large walls. The TFT-side electrode is formed on the small wall. The wall electrode is formed on a side surface of the large wall and formed between the large wall and the small wall. The large walls are separated between the pixels in the long-side direction. The small wall which has a height lower than the large walls is arranged between the separated large walls.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: February 24, 2015
    Assignee: Japan Display Inc.
    Inventors: Takato Hiratsuka, Osamu Itou
  • Patent number: 8928847
    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 transmittance of the screen.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: January 6, 2015
    Assignee: Japan Display Inc.
    Inventors: Takato Hiratsuka, Osamu Itou, Masanao Yamamoto, Daisuke Sonoda
  • Patent number: 8922738
    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: Grant
    Filed: February 8, 2011
    Date of Patent: December 30, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Takato Hiratsuka, Masaya Adachi, Hiroshi Sasaki, Miharu Otani
  • Publication number: 20140320795
    Abstract: Pixel electrodes each include a pixel plane portion expanded along a surface of the substrate, and a pixel wall portion rising up from the pixel plane portion. Common electrodes each include a common plane portion expanded along a surface of the substrate, and a common wall portion rising up from the common plane portion so as to face the pixel wall portion. Each of the compartment areas has the pixel wall portion on one of right and left sides in the lateral direction, and has the common wall portion on the other of the right and left sides. Molecules of the liquid crystal material are tilted up from the pixel wall portions in a direction of the common wall portion by the electric field. The respective pixel wall portions of the adjacent compartment areas are positioned on opposite sides to each other in the lateral direction.
    Type: Application
    Filed: March 24, 2014
    Publication date: October 30, 2014
    Applicant: Japan Display Inc.
    Inventors: Takato HIRATSUKA, Osamu ITOU, Daisuke SONODA, Toshimasa ISHIGAKI
  • Publication number: 20140268001
    Abstract: To suppress generation of low temperature impact bubbles and a damage in an electrode, etc. on a wall structure in manufacturing process, the liquid crystal display device according to the present invention includes a first substrate; a second substrate which is provided so as to face the first substrate; a liquid crystal layer which is provided between the first substrate and the second substrate; a wall structure which is formed on the first substrate; a pixel electrode which is provided at least on a side surface of the wall structure; a common electrode which is formed on the first substrate; and a plurality of pixels which include the pixel electrode and the common electrode, in which a high portion is provided at a portion of the wall structure, and the first substrate comes into contact with the second substrate at the high portion.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 18, 2014
    Applicant: Japan Display Inc.
    Inventors: Takato HIRATSUKA, Osamu ITOU, Miharu OTANI, Toshimasa ISHIGAKI, Daisuke SONODA
  • Publication number: 20140132865
    Abstract: A liquid crystal display device has a pair of wall electrodes facing each other, which is disposed on pixels on a first substrate, functions as one of pixel electrodes and a common electrode, and takes a posture of standing on the first substrate. Also, the liquid crystal display device has a center electrode that is disposed between the pair of wall electrodes, functions as the other of the pixel electrodes and the common electrode, has a convexity lower in height than the pair of wall electrodes, and makes a width in a direction along which the pair of wall electrodes faces each other gradually smaller toward the second substrate. According to this liquid crystal display device, since a vertical electric field can be prevented from being developed on an upper side of the center electrode, a transmittance of light can be improved.
    Type: Application
    Filed: October 29, 2013
    Publication date: May 15, 2014
    Applicant: Japan Display Inc.
    Inventors: Takato HIRATSUKA, Osamu ITO, Daisuke SONODA, Toshimasa ISHIGAKI
  • Publication number: 20140125905
    Abstract: A liquid crystal display device includes a liquid crystal composition, a thin film transistor substrate as an insulation substrate on which a thin film transistor for controlling the orientation of the liquid crystal composition is provided, and a color filter substrate which seals the liquid crystal composition between itself and the thin film transistor substrate and controls a wavelength region of the transmitted light. The thin film transistor substrate includes a projection part extending from the thin film transistor substrate to the color filter substrate side, and a wall-like electrode on a wall surface of the projection part, which is one electrode for controlling the orientation of the liquid crystal composition. An insulation film and an orientation film are sequentially laminated on the wall-like electrode continuously from a surface parallel to a substrate surface.
    Type: Application
    Filed: October 29, 2013
    Publication date: May 8, 2014
    Applicant: Japan Display Inc.
    Inventors: Chikae MATSUI, Yasushi TOMIOKA, Takato HIRATSUKA