Patents by Inventor Yasushi Tomioka

Yasushi Tomioka 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: 20090103018
    Abstract: A glass substrate (101) being an active matrix substrate and a resin film substrate (102) being a counter electrode are opposingly arranged on a surface of an alignment layer 132, and a liquid crystal layer (110A) is arranged therebetween. Each of polarizing plates (118, 119) is formed on an outer surface of the glass substrate (101) and the resin film substrate (102) forming a counter electrode. An uniaxial absorption anisotropy is imparted to the resin film substrate (102).
    Type: Application
    Filed: October 21, 2008
    Publication date: April 23, 2009
    Inventors: Masaki Matsumori, Ayami Ohsato, Yasushi Tomioka
  • Publication number: 20090086120
    Abstract: An object of the present invention is to propose the structure and constitution of a liquid crystal display device having a protection plate, which prevents exfoliation of black painting at ends of the protection plate when dust on the protection plate of the liquid crystal display device is wiped off, thus preventing degradation of design features.
    Type: Application
    Filed: August 15, 2008
    Publication date: April 2, 2009
    Inventors: Hiroshi Sasaki, Makiko Sugibayashi, Yasushi Tomioka, Katsumi Kondo
  • Publication number: 20090053430
    Abstract: Disclosed herein is an IPS type liquid crystal display device superior in mass productivity and improved in image quality with a higher contrast ratio by decreasing the occurrence of defective display due to the disorder of the initial liquid crystal alignment by the liquid orientation control film and realizing stable alignment of liquid crystals. A liquid crystal display device comprises: a pair of substrates 101 and 102, at least one of which is transparent; a liquid crystal layer 110? disposed between the pair of substrates; a group of electrodes formed on at least one of the pair of substrates to apply an electric field to the liquid crystal layer; plural active elements 115 connected to the group of electrodes; and an orientation control film 109 disposed on at least one of the pair of substrates, wherein said orientation control film is made of a photosensitive polyimide and a polyamide acid ester and is given orientation control ability by being irradiated with substantially linearly polarized light.
    Type: Application
    Filed: August 15, 2008
    Publication date: February 26, 2009
    Inventors: Masaki Matsumori, Yasushi Tomioka, Noboru Kunimatsu
  • Publication number: 20080297685
    Abstract: An object of the present invention is to provide an image display device having a configuration that allows the device to be manufactured in such a way as to prevent unwanted spread and penetration of the polymeric precursor of the elastomer in its liquid display panel and thereby prevent the expansion and degradation of the members adjacent to the panel, which leads to an improvement in the performance of the image display device.
    Type: Application
    Filed: May 27, 2008
    Publication date: December 4, 2008
    Inventors: Makiko Sugibayashi, Hiroshi Sasaki, Yasushi Tomioka
  • Publication number: 20080284949
    Abstract: An object of the present invention is to provide a liquid crystal display device having a wide view angle, reduced power consumption and high quality with an absorption axis of a polarizing plate and an optical axis of a retardation plate made to coincide with high accuracy without using expensive equipment and complicated steps. On a transparent substrate 11 is formed a retardation film 21 that is self-organized due to irregularities on a surface of a metal wire 12 formed on a wire grid polarizer to thereby generate a retardation.
    Type: Application
    Filed: January 17, 2008
    Publication date: November 20, 2008
    Inventors: Masaki Matsumori, Yasushi Tomioka, Katsuyuki Funahata
  • Publication number: 20080265760
    Abstract: It is an object of the present invention to provide an organic light-emitting display device which can be simply produced by a wet process, and exhibit a high efficiency and long serviceability. The present invention provides an organic light-emitting display device having an organic light-emitting layer 3 placed between an upper electrode 5 and a lower electrode 1, one of the upper electrode 5 and the lower electrode 1 is transparent electrode and the other is a light-reflecting electrode, wherein the organic light-emitting layer 3 contains a binder, hole transport material, electron transport material and light-emitting dopant.
    Type: Application
    Filed: April 24, 2008
    Publication date: October 30, 2008
    Inventors: Sukekazu Aratani, Yasushi Tomioka
  • Publication number: 20080252841
    Abstract: A spacer includes a spacer seat formed on an array substrate and a spacer member formed on the spacer seat. A front end of the spacer member is a curved surface. The spacer seat is formed during a process for producing the array substrate. The spacer member is formed by a reverse printing or inkjet process.
    Type: Application
    Filed: April 9, 2008
    Publication date: October 16, 2008
    Inventors: Katsuyuki Funahata, Kiyosi Satou, Kotaro Araya, Yasushi Tomioka
  • Publication number: 20080211984
    Abstract: An image display device designed to improve shock resistance and to eliminate external image reflection and blurring. In an liquid crystal display device are disposed a backlight, a polarizing plate on the backlight side and a liquid crystal panel held by two glass substrates and having electrodes, a liquid crystal layer, an alignment layer and a color filter therein. The image display device has a transparent front plate provided on the liquid crystal panel opposite from the backlight, a transparent organic medium layer provided between the front plate and the liquid crystal panel, and an antiglare layer provided on the front plate opposite from the transparent organic medium layer.
    Type: Application
    Filed: December 28, 2007
    Publication date: September 4, 2008
    Inventors: Makiko Sugibayashi, Hiroshi Sasaki, Katsumi Kondo, Kiyomi Nakamura, Yasushi Tomioka
  • Publication number: 20080192181
    Abstract: In a liquid crystal display comprising a liquid crystal layer, a pair of substrates between which the liquid crystal layer is arranged, a pair of polarizing plates arranged between which the substrates are arranged, and a light source arranged at an outside of the polarizing plates, the liquid crystal display further comprises a first transparent resin layer arranged between the liquid crystal layer and the light source and a second transparent resin layer to be arranged between the viewer and the liquid crystal layer, and a linear thermal expansion coefficient of the first transparent resin layer is smaller than that of the second transparent resin layer.
    Type: Application
    Filed: January 23, 2008
    Publication date: August 14, 2008
    Inventors: Kiyomi NAKAMURA, Hiroshi Sasaki, Makiko Sugibayashi, Yasushi Tomioka, Katsumi Kondo
  • Publication number: 20080073625
    Abstract: An object of the present invention is to obtain color filters having a high contrast, a high color purity and an improved transmittance for blue color, and a display using the color filters. In the present invention, there is used a colored composition for color filter comprising at least one coloring agent, a base polymer and at least one solvent, said base polymer containing a polyamicacid whose light transmittance decreases by 2% or less in the visible region (wavelength: 400 nm to 800 nm).
    Type: Application
    Filed: November 30, 2007
    Publication date: March 27, 2008
    Applicant: HITACHI DISPLAYS, LTD.
    Inventors: Kotaro ARAYA, Hiroshi SASAKI, Yasushi TOMIOKA
  • Patent number: 7349049
    Abstract: A liquid crystal display apparatus includes a pair of substrates, a liquid crystal layer arranged therebetween, a plurality of electrodes formed on one substrate for applying an electric field substantially in parallel to a face of the substrate, a plurality of active elements connected to the electrodes, and an alignment control layer formed on a face of at least one of the substrates and being in contact with said liquid crystal layer. A surface of the alignment control layer which is in contact with the liquid crystal layer has stepped difference portions, and a ratio a/d between a height of a maximum one of the stepped difference portions and a maximum thickness d of said liquid crystal layer has a range of 0.02-1. The alignment control film is made from a polyamic acid obtained by reacting a diamine with an acid anhydride of 1,2,3,4-cycle butane-tetracarboxylic acid dianhydrides.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: March 25, 2008
    Assignee: Hitachi, Ltd
    Inventors: Katsumi Kondo, Yasushi Tomioka, Takao Miwa, Makoto Yoneya
  • Patent number: 7311953
    Abstract: An object of the present invention is to obtain color filters having a high contrast, a high color purity and an improved transmittance for blue color, and a display using the color filters. In the present invention, there is used a colored composition for color filter comprising at least one coloring agent, a base polymer and at least one solvent, said base polymer containing a polyamicacid whose light transmittance decreases by 2% or less in the visible region (wavelength: 400 nm to 800 nm).
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: December 25, 2007
    Assignee: Hitachi Displays, Ltd.
    Inventors: Kotaro Araya, Hiroshi Sasaki, Yasushi Tomioka
  • Publication number: 20070178250
    Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.
    Type: Application
    Filed: February 21, 2007
    Publication date: August 2, 2007
    Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
  • Patent number: 7189439
    Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N-I) of a liquid crystal composite forming the liquid crystal layer.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: March 13, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
  • Publication number: 20070002211
    Abstract: Manufacture of a liquid crystal display is disclosed. The liquid crystal display includes a backlight unit, a backlight unit-side polarizing plate, and a liquid crystal cell held by two glass plates, the liquid crystal cell having an electrode, a liquid crystal layer, an alignment layer, and a color filter arranged between the glass plates. The liquid crystal display also includes a transparent front plate arranged at a side of the liquid crystal cell opposite to the backlight unit, a polarizing plate attached to the liquid crystal cell, and a transparent organic medium layer arranged between the front plate and the liquid crystal cell. Since the front plate is provided at the outermost surface of an image display portion, and the transparent organic medium is filled between the front plate and the liquid crystal module, it is possible to achieve an improvement in wear resistance and a reduction in reflectance.
    Type: Application
    Filed: June 30, 2006
    Publication date: January 4, 2007
    Inventors: Hiroshi Sasaki, Makiko Sugibayashi, Yuka Utsumi, Yasushi Tomioka, Katsumi Kondo
  • Publication number: 20060268198
    Abstract: A transmitting liquid crystal display apparatus includes a liquid crystal panel including a pair of substrates, a pair of polarizers arranged adjacent to the pair of substrates respectively, a liquid crystal layer held between the pair of substrates, and electrodes arranged on at least one of the pair of substrates and serving to apply an electric field to the liquid crystal layer; and a light source unit arranged external to the pair of substrates, in which each of the pair of polarizers has an absorption axis along with an extraordinary wave axis of molecules constituting the polarizers. In this apparatus, a dye layer having a disc-form molecular structure is arranged between the polarizer and the substrate, or adjacent to the polarizer in proximity to the viewer. The dye layer has a transmission axis along with the extraordinary wave axis of the disc-form molecular structure.
    Type: Application
    Filed: May 24, 2006
    Publication date: November 30, 2006
    Inventors: Yuka Utsumi, Katsumi Kondo, Yasushi Tomioka
  • Publication number: 20060215094
    Abstract: A liquid crystal display apparatus includes a pair of substrates, a liquid crystal layer arranged therebetween, a plurality of electrodes formed on one substrate for applying an electric field substantially in parallel to a face of the substrate, a plurality of active elements connected to the electrodes, and an alignment control layer formed on a face of at least one of the substrates and being in contact with said liquid crystal layer. A surface of the alignment control layer which is in contact with the liquid crystal layer has stepped difference portions, and a ratio a/d between a height of a maximum one of the stepped difference portions and a maximum thickness d of said liquid crystal layer has a range of 0.02-1. The alignment control film is made from a polyamic acid obtained by reacting a diamine with an acid anhydride of 1,2,3,4-cycle butane-tetracarboxylic acid dianhydrides.
    Type: Application
    Filed: May 31, 2006
    Publication date: September 28, 2006
    Inventors: Katsumi Kondo, Yasushi Tomioka, Takao Miwa, Makoto Yoneya
  • Patent number: 7088412
    Abstract: A liquid crystal display apparatus include a pair of substrates, a liquid crystal layer arranged between the pair of substrates; a plurality of electrodes formed on one substrate, and an alignment control layer formed on a face of at least one of the pair of substrates and being in contact with the liquid crystal layer. An optical characteristic is charged in response to a molecular alignment condition of the liquid crystal layer, and the thickness of the liquid crystal layer is set to a substantially constant thickness by spacers. A surface of the alignment control layer on the at least one of the pair of substrates which is in contact with the liquid crystal layer has stepped difference portions and on a surface formed in a display pixel, an inclination degree of a stepped difference portion in said alignment control layer is less than 1.
    Type: Grant
    Filed: January 3, 2003
    Date of Patent: August 8, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Katsumi Kondo, Yasushi Tomioka, Takao Miwa, Makoto Yoneya
  • Publication number: 20060066788
    Abstract: A liquid crystal display apparatus including one pair of substrates, at least one of said substrates being transparent, one pair of polarizing plates arranged on the paired substrates respectively, a liquid crystal layer sandwiched by the paired substrates, a liquid crystal display panel in which an electrode group is formed on at least one of the paired substrates and is to apply an electric field to the liquid crystal layer, and a light source unit arranged on a rear surface of the liquid crystal display panel, a monoaxial absorption anisotropic layer provided between the paired polarizing plates. In such apparatus, a high contrast ratio can be achieved due to suppression of black luminance. Also, better display qualities can be achieved by reducing a blue changing phenomenon of black representation.
    Type: Application
    Filed: August 17, 2005
    Publication date: March 30, 2006
    Inventors: Yuka Utsumi, Yasushi Tomioka, Masaki Matsumori, Shigeru Matsuyama, Noboru Kunimatsu, Tsunenori Yamamoto
  • Publication number: 20060061719
    Abstract: A liquid crystal display is provided which is capable of reducing the occurrence of defective display due to variations in the initial alignment direction of a liquid crystal alignment control film in a liquid crystal display of an IPS scheme, realizing the stable liquid crystal alignment, providing excellent mass productivity, and having high image quality with a higher contrast ratio. The liquid crystal display has a liquid crystal layer disposed between a pair of substrates, at least one of the substrates being transparent, and an alignment control film formed between the liquid crystal layer and the substrate. At least one of the alignment control films comprises photoreactive polyimide and/or polyamic acid provided with an alignment control ability by irradiation of substantially linearly polarized light.
    Type: Application
    Filed: December 8, 2003
    Publication date: March 23, 2006
    Inventors: Yasushi Tomioka, Hidetoshi Abe, Katsumi Kondo