Patents by Inventor Koichi Minato

Koichi Minato 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: 20130002974
    Abstract: A counter substrate for liquid crystal display includes a transparent substrate, a black matrix, and stripe transparent electrodes. The black matrix divides a plane surface of the transparent substrate into pixel or sub-pixel unit to form a light-shielded area and openings above the plane surface. The stripe transparent electrodes are formed into the pixel unit or the sub-pixel unit above the plane surface. The black matrix includes a frame pattern including two sides facing each other in parallel in the pixel or the sub-pixel unit, and a linear central pattern which is parallel to the two sides of the frame pattern and is formed at a midsection of the pixel or the sub-pixel unit. The transparent electrodes are each parallel to the two sides of the frame pattern and the central pattern and are located symmetrically to the central pattern.
    Type: Application
    Filed: April 10, 2012
    Publication date: January 3, 2013
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Koichi MINATO, Kenzo Fukuyoshi, Mie Shimizu
  • Publication number: 20120262653
    Abstract: A liquid crystal display device includes an array substrate and a counter substrate that face each other with a liquid crystal layer therebetween. The array substrate includes a first electrode, a second electrode, and an alignment sustaining layer. The first electrode has a comb-teeth shape. The second electrode has a comb-teeth shape, faces the first electrode, and includes a protruding portion protruding from the first electrode in a direction where comb teeth are arranged. The alignment sustaining layer is formed above a surface of the array substrate being in contact with the liquid crystal layer and gives liquid crystals a pre-tilt to a direction in which the second electrode protrudes from the first electrode, in a direction in which the comb teeth are arranged.
    Type: Application
    Filed: April 10, 2012
    Publication date: October 18, 2012
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Mie SHIMIZU, Koichi Minato, Kenzo Fukuyoshi, Manabu Ito
  • Patent number: 8268201
    Abstract: A color filter and a liquid crystal display device with the color filter that includes a substrate; and a color layer formed on the substrate and constituting color pixels of a plurality of colors, wherein the color layer is formed through a curing of a color composition comprising at least acrylic resin and a coloring agent, wherein the acrylic resin contains a copolymer formed of a first vinyl monomer having a benzyl group and a second vinyl monomer having a carboxyl group, the first vinyl monomer having a function of regulating a retardation of a color layer, the copolymer having a weight average molecular weight of 3000 to 11000 and an acid value of solid matter falling within the range of 30 to 85.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: September 18, 2012
    Assignees: Toppan Printing Co., Ltd., DIC Corporation
    Inventors: Mie Shimizu, Koichi Minato, Masaharu Takahashi
  • Patent number: 8262946
    Abstract: Disclosed is a color composition for a color filter, which includes at least acrylic resin and a coloring agent. The acrylic resin contains a copolymer formed of a first vinyl monomer having a benzyl group and a second vinyl monomer having a carboxyl group, the copolymer having a weight average molecular weight of 3,000 to 11,000, and an acid value of solid matter of the copolymer being confined to 30 to 85.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: September 11, 2012
    Assignees: Toppan Printing Co., Ltd., DIC Corportion
    Inventors: Mie Shimizu, Koichi Minato, Masaharu Takahashi
  • Publication number: 20120094221
    Abstract: A method of a color filter substrate for a semitransmissive type liquid crystal display device, including: forming a photosensitive coloring composition layer containing a photo-polymerizable monomer, a resinous binder, a polymerization initiator, a coloring agent and a solvent on a surface of a transparent substrate, the surface being partitioned into a large number of pixel regions; exposing the photosensitive coloring composition layer to light; and developing the photosensitive coloring composition layer to form a transmissive portion and a reflective portion, the transmissive portion being assigned to colorize a transmitted light from a light source arranged on a rear surface side of a liquid crystal display device, the reflective portion being assigned to colorize a reflected light to be derived from reflection of an external light entering from the observer's side and having a through-hole with a diameter of 10 pm or less.
    Type: Application
    Filed: December 27, 2011
    Publication date: April 19, 2012
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Mie Shimizu, Koichi Minato, Takeshi Itoi
  • Patent number: 8081276
    Abstract: A coloring composition for a color filter includes a transparent resin, an organic pigment dispersed in the transparent resin, and a retardation-regulating agent dispersed in the transparent resin and containing a compound which is capable of increasing retardation in the thickness direction to minimize the difference in retardation among colored pixels. A color filter having colored pixels formed on a transparent substrate uses this coloring composition. A liquid crystal display device using this color filter may have improved black image quality and contrast.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: December 20, 2011
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Koichi Minato, Mie Shimizu, Hidesato Hagiwara, Sohei Kadota
  • Patent number: 8049844
    Abstract: A color filter includes red, green and blue filter segments and is adapted to be used in a liquid crystal display device using, as a light source, a white LED having specified spectral properties. The red filter segment has a 50% transmittance wavelength within a range of 595 to 610 nm and a transmittance of 85% or more at a wavelength of 630 nm. The blue filter segment has a maximum transmittance wavelength of 455 nm or less and a transmittance of 55% or more at a wavelength of 450 nm. A thickness of each of the red, green and blue filter segments is 3.0 ?m or less. A liquid crystal display device including this color filter and the white LED is also disclosed.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: November 1, 2011
    Assignees: Toyo Ink Mfg. Co., Ltd., Toppan Printing Co., Ltd.
    Inventors: Satoshi Okutsu, Kenro Sunahara, Atsushi Nishida, Yukino Miyagawa, Tomoyuki Kadowaki, Mie Shimizu, Takeshi Itoi, Koichi Minato
  • Publication number: 20110215284
    Abstract: A color filter and a liquid crystal display device with the color filter that includes a substrate; and a color layer formed on the substrate and constituting color pixels of a plurality of colors, wherein the color layer is formed through a curing of a color composition comprising at least acrylic resin and a coloring agent, wherein the acrylic resin contains a copolymer formed of a first vinyl monomer having a benzyl group and a second vinyl monomer having a carboxyl group, the first vinyl monomer having a function of regulating a retardation of a color layer, the copolymer having a weight average molecular weight of 3000 to 11000 and an acid value of solid matter falling within the range of 30 to 85.
    Type: Application
    Filed: April 29, 2011
    Publication date: September 8, 2011
    Applicants: TOPPAN PRINTING CO., LTD., DIC CORPORATION
    Inventors: Mie Shimizu, Koichi Minato, Masaharu Takahashi
  • Publication number: 20110181818
    Abstract: Disclosed a color filter for a liquid crystal display device, which exhibits a color filter contrast of 9000 or more and includes a transparent substrate, and a plurality of color layers exhibiting different color from each other and formed on the transparent substrate, wherein each of the color layers is a cured film of a color resin composition containing a polymer composition obtained through a copolymerization of styrene and an unsaturated carboxylic acid-containing monomer, a content of the styrene in the polymer composition being confined to a range of not less than 75 mol. % and less than 95 mol. %, and a retardation in a thickness direction “Rth” of each of these color layers is confined within a range of 0 nm to ?10 nm.
    Type: Application
    Filed: March 30, 2011
    Publication date: July 28, 2011
    Applicant: Toppan Printing Co., Ltd.
    Inventors: Koichi Minato, Mie Shimizu, Toshihisa Watanabe, Koki Tsubaki
  • Publication number: 20110149215
    Abstract: Disclosed is a color filter substrate provided with a transparent substrate, and a plurality of color pixels including a green pixel and formed on the transparent substrate. The green pixel contains halogenated zinc phthalocyanine-based green pigment and at least one kind of yellow pigment and satisfies prescribed three conditions, and absolute value of retardation in thickness direction (Rth) of the green pixel is confined to no more than 2 nm.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 23, 2011
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Mie Shimizu, Takeshi Ikeda, Hidesato Hagiwara, Koichi Minato
  • Publication number: 20110149216
    Abstract: A coloring composition for a color filter, which includes a transparent resin, an organic pigment dispersed in the transparent resin, and a retardation-regulating agent containing a compound which is capable of increasing a retardation. A color filter which is provided with colored pixels formed on a transparent substrate by using this coloring composition. A liquid crystal display device which is provided with this color filter.
    Type: Application
    Filed: February 24, 2011
    Publication date: June 23, 2011
    Applicant: TOPPAN PRINTING CO., LTD
    Inventors: Koichi Minato, Mie Shimizu, Hidesato Hagiwara, Sohei Kadota
  • Patent number: 7965353
    Abstract: A color filter comprising a substrate, a red pixel, green pixel and blue pixel, each being disposed on the substrate, wherein a perpendicular optical retardation RRth of the red pixel, a perpendicular optical retardation GRth of the green pixel, and a perpendicular optical retardation BRth of the blue pixel satisfy the following formulas (1) and (2): |(RRth?BRth)|?|(GRth?BRth)|?0??(1) |(RRth?BRth)|?|(RRth?GRth)|?0??(2) wherein RRth, GRth and BRth represent, respectively, a product of a thickness [nm] of a pixel and a value obtained by subtracting a value of thickness-wise refractive index from an average value of an in-plane refractive index of each of these pixels.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: June 21, 2011
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Sosuke Akao, Koichi Minato, Satoshi Ohkuma, Yoshinori Nagasaki, Takeshi Itoi, Mitsuhisa Hatashima
  • Patent number: 7948623
    Abstract: A method of evaluating a color filter including a substrate, and at least three color pixels disposed thereon, the method includes determining an oblique visibility of a liquid crystal display device equipped with the color filter on the basis of value ?1 obtained from the equation (1): ?1=?ab?(?)·T(?)d???(1) wherein “a” and “b” are values respectively representing a wavelength range of a continuous wavelength light and satisfying conditions of 380?a, b?780 and a<b; ?(?) represents an optical retardation obtained by irradiating each of color pixels with a continuous wavelength light containing light components with wavelength ? falling within a range of 380 nm to 780 nm at an incident angle, and subjecting the transmitted light to measurement using a spectroscopic ellipsometer, and T(?) represents a spectral transmittance of the color pixels measured at the wavelength ? falling within a range of 380 nm-780 nm.
    Type: Grant
    Filed: June 18, 2009
    Date of Patent: May 24, 2011
    Assignees: Toppan Printing Co., Ltd., Tokyo Ink Mfg. Co., Ltd.
    Inventors: Koichi Minato, Takeshi Itoi, Sosuke Akao, Hidesato Hagiwara, Masayuki Yamamoto, Yuki Saito
  • Patent number: 7948583
    Abstract: A coloring composition for a color filter, which includes a transparent resin, an organic pigment dispersed in the transparent resin, and a retardation-regulating agent containing a compound which is capable of increasing a retardation. A color filter which is provided with colored pixels formed on a transparent substrate by using this coloring composition. A liquid crystal display device which is provided with this color filter.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: May 24, 2011
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Koichi Minato, Mie Shimizu, Hidesato Hagiwara, Sohei Kadota
  • Publication number: 20110096273
    Abstract: Disclosed is a color filter substrate which exhibits color filter contrast of not less than 9000 and includes a transparent substrate, and a plurality of color pixels differing in color and formed on the transparent substrate, wherein each of the plurality of color pixels is formed of a photosensitive color composition containing two or more kinds of pigments, a birefringence ?n of a pigment dispersion represented by following equation (1) and a content of pigments contained in the photosensitive composition satisfies prescribed conditions, and, an absolute value of retardation in thickness direction (Rth) of the color pixels which is represented by following equation (2) is confined to a range of 0-3 nm.
    Type: Application
    Filed: October 21, 2010
    Publication date: April 28, 2011
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Mie Shimizu, Takeshi Ikeda, Hidesato Hagiwara, Koichi Minato
  • Publication number: 20110096274
    Abstract: Disclosed is a liquid crystal display device including a liquid crystal cell provided with a color filter, a pair of polarizing plates arranged on both outside surfaces of the liquid crystal cell, and an optical compensation layer disposed inside of each polarizing plate, wherein, when a chromaticity (u, v) represented in CIE1960 color system is measured in a black state of the liquid crystal display device, a color difference ?uv given by equation (1) described below is 0.02 or less in an range of 0<??60: ?uv=[{u(?)?u(?)}2+[{v(?)?v(?)}2]1/2??(1) wherein (u(?), v(?)) is chromaticity as viewed from a vertical direction and (u(?), v(?)) is chromaticity as viewed from a direction inclined at an angle of ? degrees with a direction of a normal line of a display surface.
    Type: Application
    Filed: January 3, 2011
    Publication date: April 28, 2011
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Mie Shimizu, Koichi Minato, Yasuhiro Hibayashi, Sohei Kadota
  • Publication number: 20100295002
    Abstract: Disclosed is a color composition for a color filter, which includes at least acrylic resin and a coloring agent. The acrylic resin contains a copolymer formed of a first vinyl monomer having a benzyl group and a second vinyl monomer having a carboxyl group, the copolymer having a weight average molecular weight of 3,000 to 11,000, and an acid value of solid matter of the copolymer being confined to 30 to 85.
    Type: Application
    Filed: May 13, 2010
    Publication date: November 25, 2010
    Applicants: TOPPAN PRINTING CO., LTD., DIC CORPORATION
    Inventors: Mie Shimizu, Koichi Minato, Masaharu Takahashi
  • Patent number: 7763672
    Abstract: A red-colored film in which when an elliptically polarized light is incident on the film in a direction 45° aslant from a normal line direction with respect to a surface of the film, a light transmitted through the film has an average amplitude transmittance ratio (av. tan ?) in a wavelength region of 575 to 635 nm, which satisfies the following equation (1): 0.960<av. tan ?<1.040??(1). A red-colored composition contains a red pigment A having a BET specific surface area in the range from 90 to 140 m2/g, a red pigment B having a BET specific surface area in the range from 70 to 85 m2/g, and a pigment carrier formed of a transparent resin, a precursor of the transparent resin or a mixture of the tarns parent resin and precursor thereof. A color filter has the red-colored film as a red color filter segment. The liquid crystal display device includes the color filter.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: July 27, 2010
    Assignees: Toyo Ink Mfg. Co., Ltd., Toppan Printing Co., Ltd.
    Inventors: Masayuki Yamamoto, Akira Hirano, Hideyo Tanaka, Yusuke Iida, Satoshi Ohkuma, Koichi Minato, Takeshi Itoi, Hidesato Hagiwara
  • Publication number: 20090321693
    Abstract: A red colored composition including a pigment, binder resin, monomer, photopolymerization initiator, and organic solvent, wherein the pigment contains a diketopyrrolopyrrol-based red pigment and has an average primary particle diameter of at most 40 nm, and the binder resin contains at least one thermosetting resin of 5 to 12% by weight based on solid content of the composition, the thermosetting resin having a weight-average molecular weight of 25,00 to 20,000.
    Type: Application
    Filed: June 25, 2009
    Publication date: December 31, 2009
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Satoshi Ohkuma, Noriko Asahi, Mie Shimizu, Koichi Minato
  • Publication number: 20090284697
    Abstract: A color filter including a transparent substrate, and colored layer having at least a red pixel, green pixel, and blue pixel, and formed on the transparent substrate, wherein the green pixel contains a zinc phthalocyanine halide-based pigment, and has a perpendicular optical retardation Rth(G) satisfying formula Rth(G)>0, Rth(G) representing a product of a thickness of the green pixel and a value obtained by subtracting a refractive index in the thickness wise-direction of the green pixel from an average refractive index in the plane of the green pixel.
    Type: Application
    Filed: May 7, 2009
    Publication date: November 19, 2009
    Applicant: TOPPAN PRINTING CO., LTD.
    Inventors: Noriko Asahi, Koichi Minato, Mie Shimizu, Satoshi Ohkuma, Hidesato Hagiwara, Kayo Yoshida