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Hirofumi Toyama

Hirofumi Toyama, Kanagawa JP

Patent application numberDescriptionPublished
20090066887Polymer Film, Polarizing Plate Protective Film, Polarizing Plate and Liquid Crystal Display Device - A polymer film satisfying the following formulae (1) to (3):03-12-2009
20090128747Method for Producing Cellulose Acylate Film, Polarizing Plate and Liquid Crystal Display - A method for producing a cellulose acylate film is provided and includes the steps of: a stretching step of stretching a film; and a shrinking step of shrinking the film05-21-2009
20090135344POLYMER FILM, CYCLIC POLYOLEFIN FILM, METHOD FOR MANUFACTURING THE SAME, OPTICAL COMPENSATION FILM, POLARIZER AND LIQUID CRYSTAL DISPLAY DEVICE - A polymer film, wherein when any point in the polymer film is taken as a center, a maximum difference between high and low film thicknesses within a range of 60 mm diameter is not more than 1 μm, an RMS value of a film thickness is 0 μm to 0.15 μm or a difference between maximum and minimum values of slow axis angle in any 60 mm×60 mm square in the polymer film is 0° to 0.40°; and a solution casting film-forming method comprising: casting a dope on a support; peeling the casted film, wherein a dry wind of 3 m/s to 15 m/s is applied to the casted film within 15 seconds from the casting, and wherein before the dry wind is applied to the casted film, an air floating on a surface of the casted film has a wind velocity of less than 3 m/s.05-28-2009
20110001908LIQUID-CRYSTAL DISPLAY DEVICE - A liquid-crystal display device comprising a liquid-crystal cell, a first polarizing element and a second polarizing element disposed on either side of the liquid-crystal cell respectively, a first retardation layer between the first polarizing element and the liquid-crystal cell, and a second retardation layer between the second polarizing element and the liquid-crystal cell, wherein a transmission axis of the first polarizing element is perpendicular to the slow axis of the first retardation layer; and a transmission axis of the second polarizing element is parallel to the slow axis of the second retardation layer; and the first retardation layer and the second retardation layer satisfy the formula (1) 0 nm<ΔRe01-06-2011

Hirofumi Toyama, Minami-Ashigara-Shi JP

Patent application numberDescriptionPublished
20080204644Liquid crystal display device - A liquid crystal display device comprising first and second polarizing elements of which transmission axes are perpendicular to each other, and, disposed between the polarizing elements, a liquid crystal layer vertically aligned in a black state, and first and second optically anisotropic layer is disclosed. In the liquid crystal display device, the first optically anisotropic layer is a biaxial optically anisotropic layer of which in-plane retardation (Re) and thickness-direction retardation (Rth) are larger at a longer wavelength range within a range of from 400 nm to 700 nm, and the second optically anisotropic layer satisfies 0 nm<|Re(550)|<10 nm and |Rth(550)|/|Re(550)|>10 08-28-2008
20090086131LIQUID CRYSTAL DISPLAY DEVICE - Disclosed is a liquid-crystal display device comprising a liquid-crystal cell comprising a liquid-crystal layer that aligns vertically to the substrate thereof in a black state, two polarizing elements that are disposed to sandwich the liquid-crystal cell therebetween in a manner that their absorption axes are perpendicular to each other, and retardation films having equivalent optical anisotropy that are disposed between each of the two polarizing elements and the liquid-crystal cell, wherein the retardation films comprise a cellulose acylate and a liquid-crystal compound, and satisfy 30 nm≦Re(550)≦80 nm, 70 nm≦Rth(550)≦140 nm, Re(450)/Re(550)<1 and Re(650)/Re(550)>1.04-02-2009
20090161043LIQUID CRYSTAL DISPLAY DEVICE - A liquid crystal display device includes: a backlight; a liquid crystal cell; a first polarizing plate provided between the liquid crystal cell and the backlight; a second polarizing plate provided in opposite side to the first polarizing plate with respect to the liquid crystal cell; a first retardation film provided between the first polarizing plate and the liquid crystal cell; and a second retardation film provided between the second polarizing plate and the liquid crystal cell, wherein a relationship represented by the following formula (1) is satisfied:06-25-2009
20090207355LIQUID-CRYSTAL DISPLAY DEVICE - A liquid-crystal display device comprising a liquid-crystal cell having a liquid-crystal layer that aligns vertically to the substrate thereof in the black state, first and second polarizing elements that are disposed to sandwich the liquid-crystal cell therebetween in a manner that their absorption axes are perpendicular to each other, an optically-biaxial retardation film A disposed between the first polarizing element and the liquid-crystal cell, and an optically-biaxial retardation film B disposed between the second polarizing element and the liquid-crystal cell, wherein the retardation films A and B differ from each other in the optical anisotropy, is disclosed.08-20-2009
20100020273POLYMER FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY - A polymer film stretched after formed by solution casting, of which the wavelength dispersion of the refractivity anisotropy and/or the refractivity anisotropy differ between two surfaces of the film is disclosed.01-28-2010
20100328584LIQUID CRYSTAL DISPLAY DEVICE - A liquid crystal display device is provided and includes: a liquid crystal cell including a pair of transparent glass substrates each having a transparent electrode, and a nematic liquid crystal between the pair of the transparent glass substrates; and a pair of polarizing plates sandwiching the liquid crystal cell. At least one of the pair of polarizing plates includes a protective film; a polarizer; and an optical compensation film. One of the pair of transparent glass substrates, an, adhesive; the optical compensation film; the polarizer; and the protective film are stacked in this order, and they satisfy the following equations (1) to (3):12-30-2010

Patent applications by Hirofumi Toyama, Minami-Ashigara-Shi JP