Including At Least One With Negative Intrinsic Birefringence Patents (Class 349/120)
  • Patent number: 8236107
    Abstract: A system that forms an alignment layer of a liquid crystal device has an applicator that applies an alignment layer of material on a substrate, a magnetic field generator that applies a magnetic field to directionally align the alignment layer material, and a firing device to fire the directionally aligned material.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: August 7, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Jae-Choon Ryu, Hao-Joon Son
  • Patent number: 8228471
    Abstract: The liquid crystal panel 1 of the present invention comprises a liquid crystal cell 2, a first polarizer 31 disposed on one surface side of the liquid crystal cell 2, a second polarizer 41 disposed on the other surface side of the liquid crystal cell 2, and first optical compensation layer 5 and second optical compensation layer 6 disposed between the first polarizer 31 and second polarizer 41, and the liquid crystal cell 2 satisfies a relationship of 0.8 Re [450]/Re [550] 1, the first optical compensation layer 5 satisfies relationships of the Nz coefficient is from 0.8 to 1.4 and 0.8 Re[450]/Re[550] 1, and the second optical compensation layer 6 satisfies relationships of nx =ny>nz and 0.98 Re[450]/Re[550] 1.04. The liquid crystal panel of the present invention is hardly generated color shift when the panel is viewed from all azimuth angle directions and polar angle directions, so that the liquid crystal panel is excellent in color display characteristics.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: July 24, 2012
    Assignee: Nitto Denko Corporation
    Inventors: Junichi Nagase, Kentarou Takeda
  • Patent number: 8226860
    Abstract: A method for controlling positive birefringence in an optical compensation film (positive C-plate) having high positive birefringence throughout the wavelength range 400 nm<?<800 nm is provided. The method includes selecting polymers with optically anisotropic subunits (OASUs) that exhibit the buttressing effect, wherein the OASUs may be disks, mesogens or aromatic rings substituted with birefringence enhancing substituents. The method further includes processing the polymer by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. These optical compensation films may be used in LCDs, particularly IPS-LCDs.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: July 24, 2012
    Assignee: Akron Polymer Systems
    Inventors: Xiaoliang Joe Zheng, Frank W. Harris, Ted Calvin Germroth, Jiaokai Alexander Jing, Dong Zhang, Thauming Kuo, Brian Michael King
  • Patent number: 8203675
    Abstract: 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.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: June 19, 2012
    Assignee: FUJIFILM Corporation
    Inventors: Yujiro Yanai, Hirofumi Toyama, Hajime Nakayama
  • Patent number: 8194212
    Abstract: The present invention provides a liquid crystal display device that has a higher contrast ratio in a wide viewing angle and that can be easily produced at low cost.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: June 5, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Akira Sakai
  • Patent number: 8184246
    Abstract: A transparent film is disclosed. The film comprises a domain in which the Nz value in the normal direction of the film surface shows monotonous increase from 0 to 1 or monotonous decrease from 1 to 0, and having an in-plane retardation Re at a wavelength of 550 nm falling within the range from 510 to 610 nm, provided that Nz is defined as Nz=0.5+Rth(550)/Re(550), where Rth(550) and Re(550) respectively indicate a thickness-direction retardation and an in-plane retardation at a wavelength of 550 nm.
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: May 22, 2012
    Assignee: FUJIFILM Corporation
    Inventor: Yukito Saitoh
  • Patent number: 8174650
    Abstract: The present invention provides an LCD device that has a higher contrast ratio in a wide viewing angle and that can be easily produced at low cost. The present invention is a liquid crystal display device, including in the following order: a first polarizer; a first birefringent layer; a first quarter-wave plate; a liquid crystal cell; a second quarter-wave plate; a second birefringent layer; and a second polarizer having an absorption axis orthogonal to an absorption axis of the first polarizer, wherein the first birefringent layer satisfies Nz>0.
    Type: Grant
    Filed: November 28, 2008
    Date of Patent: May 8, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akira Sakai, Kazuyoshi Sakuragi
  • Patent number: 8174648
    Abstract: Disclosed is a cellulose acylate film comprising a cellulose acylate satisfying relations of 2.0?A+B?2.45, (II): and 0.8?A?1.4, and (III): 0.6?B?1.65 where “A” represents a degree of acetyl substitution of hydroxy in a glucose unit of cellulose acylate; and “B” represents a degree of with C3 or longer acyl substitution of hydroxy in a glucose unit of cellulose acylate; and satisfying relations of 50 nm?Re(590)?70 nm, 100 nm?Rth(590)?120 nm, and (VI): 1.4?Rth(590)/Re(590)?2.6.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: May 8, 2012
    Assignee: FUJIFILM Corporation
    Inventor: Eiichiro Aminaka
  • Patent number: 8169573
    Abstract: A liquid crystal display (LCD) device is provided. The LCD device includes an LCD panel having a first liquid crystal layer therein; a first polarizing sheet; and a first phase-difference compensation portion disposed adjacent a first surface of the LCD panel between the LCD panel and the first polarizing sheet. The first phase-difference compensation portion includes a plurality of phase-difference films having at least second and third liquid crystal layers with tilt angles that are different.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: May 1, 2012
    Assignee: LG Display Co., Ltd.
    Inventor: Mi Sook Nam
  • Patent number: 8169574
    Abstract: A liquid crystal display includes: a liquid crystal layer squeezed between first and second transparent substrates and vertically aligned at a retardation of 300 nm or larger to 940 nm or smaller; two or three viewing angle compensators disposed on the first transparent substrate on the side opposite to the liquid crystal layer, each of the viewing angle compensators having a retardation of 90 nm or larger to 350 nm or smaller in a thickness direction and a retardation of 5 nm or larger to 30 nm or smaller in an in-plane direction; a first polarizer disposed on the two or three viewing angle compensator; and a second polarizer disposed on the second transparent substrate and crossed-Nichol disposed relative to the first polarizer, wherein an in-plane slow axis of each viewing angle compensator is disposed perpendicular to an absorption axis of the first polarizer.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: May 1, 2012
    Assignee: Stanley Electric Co., Ltd.
    Inventor: Yoshihisa Iwamoto
  • Patent number: 8164722
    Abstract: A liquid-crystal display device comprising a liquid-crystal cell and at least three optically-anisotropic layers disposed on each side of the liquid crystal cell, wherein they are combined so that the ?nd value of the liquid-crystal cell and the optical characteristics of the optically-anisotropic layers can satisfy predetermined relationships, is disclosed.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: April 24, 2012
    Assignee: FUJIFILM Corporation
    Inventors: Katsufumi Ohmuro, Shun Nakamura
  • Patent number: 8159639
    Abstract: A liquid-crystal display device comprising a liquid-crystal cell comprising 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 so that their absorption axes are orthogonal to each other, a retardation film A and a retardation film B, wherein the retardation films A and B are equivalent to each other in terms of retardation in plane at a wavelength of 548 nm, Re(548), and retardation along thickness direction at a wavelength of 548 nm, Rth(548) thereof, but differ from each other in terms of the wavelength dispersion characteristics of retardation in plane Re and/or retardation along thickness direction Rth thereof in a visible light region, is disclosed.
    Type: Grant
    Filed: February 2, 2009
    Date of Patent: April 17, 2012
    Assignee: FUJIFILM Corporation
    Inventors: Yujiro Yanai, Hajime Nakayama, Hirofumi Toyama
  • Patent number: 8149360
    Abstract: A projection image display apparatus includes: light source; polarization/separation element having a polarization/separation plane through which one polarized light passes and which reflects the other orthogonal to the one; an image display element for modulating the incident light into image light and reflecting the image light; and a retardation plate disposed between the polarization/separation element and the image display element: the retardation plate has refractive indices different between two orthogonal directions in an optical surface thereof, and gives phase difference larger than ?/4 to polarized light entering the optical surface and having a wavelength ?; and supposing z axis be a normal to a light entering/exiting surface of the polarization/separation element, y axis be perpendicular to z axis and a normal to the polarization/separation plane, and x axis be perpendicular to z- and y-axes, the first retardation plate has optic axis within xz plane and tilted to x axis.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: April 3, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yutaka Yamaguchi
  • Patent number: 8134666
    Abstract: A liquid crystal display device of an in-plane switching mode comprises at least optically anisotropic members (A) and (B) and a liquid crystal cell disposed between a pair of polarizers having absorption axes disposed approximately perpendicularly to each other, wherein nzA>nyA and nxB>nzB (nxA, nxB: refractive indices (n) in the direction of the in-plane slow axis; nyA, nyB: n in the in-plane direction perpendicular to the above direction; nzA, nzB: n in the direction of thickness, each at 550 nm); the in-plane slow axes of (A) and (B) are approximately parallel or perpendicular to each other; and the in-plane slow axis of (A) is approximately parallel or perpendicular to the absorption axis of a polarizer closer to (A). The antireflection property, scratch resistance and durability are excellent, the angle of field is wide, and uniform display of images with great contrast can be achieved at any angle of observation.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: March 13, 2012
    Assignee: Zeon Corporation
    Inventors: Motohiro Itadani, Shuhei Okude, Shunsuke Yamanaka, Kohei Arakawa
  • Patent number: 8107042
    Abstract: Disclosed herein are an integrated O film for improving a viewing angle of a TN-LCD, and a polarizer plate and TN-LCD including the same. Also disclosed herein are a compensation film which is capable of improving a contrast characteristic at a front side and an inclination angle and minimizing a color variation according to a viewing angle in a dark state, and a polarizer plate and TN-LCD including the same. The integrated O film includes a transversely-stretched negative biaxial (B) film and a positive O film laminated on the transversely-stretched negative B film.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: January 31, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Byoung-Kun Jeon, Sergey Belyaev, Chang-Hun Yun, Moon-Soo Park
  • Patent number: 8089593
    Abstract: An optical resin film is provided, in which a wavelength dispersion of a retardation in planar direction and a wavelength dispersion of a retardation in thickness direction are independently controlled, is provided and has at least an additive having a negative intrinsic birefringence.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: January 3, 2012
    Assignee: Fujifilm Corporation
    Inventors: Hiromoto Haruta, Nobutaka Fukagawa, Osamu Uchida, Aiko Yoshida, Kunihiro Atsumi
  • Patent number: 8085370
    Abstract: The application relates to a single-polarizer reflective bistable twisted nematic (BTN) liquid crystal display device comprising a liquid crystal layer of thickness d, birefringence ?n and retardation ?nd, said liquid crystal layer being situated between two substrates and between a polarizer and a reflector, said liquid crystal layer in the absence of an applied electric field having two stable uniformly twisted textures, the twists of the two stable textures differing by an angle being equal mainly to 180°, and at least one compensation layer positioned between said polarizer and said reflector, said compensation layer being composed of at least one birefringent film, said birefringent film having an optical anisotropy defined by three characteristic refractive indices nx, ny, nz, along three corresponding axis x, y, z of index ellipsoid, x and y being situated inside the substrates plane, nx and ny being called in plane indices, with nx?ny, x being called slow axis, and z being perpendicular to the substra
    Type: Grant
    Filed: May 10, 2006
    Date of Patent: December 27, 2011
    Assignee: Nemoptic
    Inventors: Cécile Joubert, Terry Scheffer
  • Patent number: 8077277
    Abstract: A liquid crystal display device comprising a first optical compensating member disposed without a birefringent medium sandwiched between a liquid-crystal layer and the first optical compensating member. The first optical compensating member is constructed so that when a refractive index thereof in a slow-axis direction in a plane parallel to the substrate is taken as n1, a refractive index in a fast-axis direction in the plane parallel to the substrate is taken as n2, and a refractive index in a thickness direction is taken as n3, the first optical compensating member satisfies n1˜n3>n2 and a slow axis thereof in the plane parallel to the substrate is substantially vertical to an optical axis of the liquid-crystal layer.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: December 13, 2011
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Kentaro Ojima, Daisuke Kajita, Ikuo Hiyama, Masahiro Ishii
  • Patent number: 8054441
    Abstract: A laminated optical film including a first optical anisotropic layer, and a second optical anisotropic layer, wherein Relationship (1), ?10 nm??Re1??Re2?10 nm, is satisfied when a slow phase axis of the first optical anisotropic layer is substantially perpendicular to a slow phase axis of the second optical anisotropic layer, wherein Relationship (2), ?10 nm??Re1+?Re2?10 nm, is satisfied when the slow phase axis of the first optical anisotropic layer is substantially parallel to the slow phase axis of the second optical anisotropic layer, wherein an in-plane retardation value Re of the film as a whole satisfies 30 nm?Re?500 nm, where ?Re1 denotes a value calculated from “Re1 (at a temperature of 50° C.)?Re1 (at a temperature of 25° C.)” concerning the first optical anisotropic layer, and ?Re2 denotes a value calculated from “Re2 (at a temperature of 50° C.)?Re2 (at a temperature of 25° C.)” concerning the second optical anisotropic layer.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: November 8, 2011
    Assignee: FUJIFILM Corporation
    Inventors: Shun Nakamura, Masayoshi Toyoda
  • Patent number: 8049850
    Abstract: A liquid crystal display device comprising a liquid crystal panel in which liquid crystals having negative dielectric anisotropy are interposed between upper substrate and lower substrate that have been vertically oriented on the surface, the orientation of the liquid crystals being almost vertical with no applied voltage, almost horizontal when a predetermined voltage is applied, and tilted when a smaller voltage than the predetermined voltage is applied; a first polarizer and a second polarizer disposed on both sides of the liquid crystal panel such that the absorption axes of the polarizers are perpendicular to each other; a first retardation film disposed between the liquid crystal panel and the first polarizer; and a second retardation film disposed between the liquid crystal panel and the second polarizer, wherein the polarizer comprises a polarizing film and a pair of protective films having the polarizing film in between, and wherein at least one of the protective films is a cellulose acylate film sat
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: November 1, 2011
    Assignee: FUJIFILM Corporation
    Inventors: Susumu Sugiyama, Eiichiro Aminaka, Hajime Nakayama, Yukito Saitoh
  • Patent number: 8049823
    Abstract: The disclosure is directed to projectors, optical compensation methods and liquid crystal devices. In one example, a liquid crystal panel has a liquid crystal layer pinched between a pair of substrates. A pair of polarizing plates is disposed with the liquid crystal panel in between the polarizing plates. A first phase difference plate is disposed between the pair of polarizing plates for compensating for a phase difference of the liquid crystal panel. A second phase difference plate is disposed between the pair of polarizing plates for compensating for a phase difference of the pair of polarizing plates. In certain embodiments, the first phase difference plate may have an optically anisotropic layer having a negative refractive index anisotropy and an optical axis oriented in a thickness direction of the first phase difference plate. This abstract is intended only to aid those searching patents, and is not intended to be used to interpret or limit the scope or meaning of the claims in any manner.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: November 1, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Yoshitake Tateno
  • Patent number: 8049843
    Abstract: Disclosed is a polarizing plate comprising at least first and second polarizing elements and satisfying (1) kx1>ky1=kz1, (2) kz2>ky2 and (3) (kx1?ky1)×d1>(kz2?ky2)×d2, wherein an x-axis and a y-axis are in-plane axes crossing perpendicularly to each other, and a z-axis is the axis crossing perpendicularly to the x-y axis plane; kx1, ky1 and kz1 each are the absorption coefficient in the x-axis, y-axis and z-axis directions, respectively, of the first polarizing element; ky2 and kz2 each are the absorption coefficient in the y-axis and z-axis directions, respectively, of the second polarizing element; and d1 and d2 each are the thickness (unit: nm) of the first and second polarizing elements, respectively.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: November 1, 2011
    Assignee: FUJIFILM Corporation
    Inventor: Yukito Saitoh
  • Patent number: 8018554
    Abstract: A liquid crystal device, in which a liquid crystal layer is held between a pair of substrates, includes a plurality of pixels and a retardation layer. Each of the plurality of pixels includes a transmissive display area and a reflective display area. The retardation layer is arranged at a position that at least overlaps the reflective display areas and on an inner surface side of the pair of substrates. The retardation layer is formed so as to extend over the reflective display areas of at least two adjacent pixels among the plurality of pixels. The retardation layer has a first end portion and a second end portion. The first end portion is located on one of the two adjacent pixels. The second end portion is opposite the first end portion and located on the other pixel of the two adjacent pixels.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: September 13, 2011
    Assignee: Sony Corporation
    Inventor: Shin Fujita
  • Patent number: 8017199
    Abstract: A cellulose acylate film comprising at least one retardation raising agent having specific rod-like polarizability anisotropy or specific plane polarizability anisotropy, and specific distance between terminals of a molecule in a specific amount; a process for producing the same; and a polarizing plate and liquid crystal display using the same.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: September 13, 2011
    Assignee: FUJIFILM Corporation
    Inventors: Nobutaka Fukagawa, Osamu Ochida, Shigeki Uehira, Tomohiro Ogawa
  • Patent number: 7999895
    Abstract: A contrast compensator for improving the panel contrast of liquid crystal (LC) microdisplays having a high-order waveplate configured as an O-plate and supporting a thin film transistor layer is provided. The contrast compensator includes a counter high-order waveplate configured as an O-plate, which has a birefringence opposite in sign to a birefringence of the thin film transistor substrate.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: August 16, 2011
    Assignee: JDS Uniphase Corporation
    Inventors: Kim Leong Tan, Nada A. O'Brien
  • Patent number: 7969543
    Abstract: This invention pertains to the design and construction of retardation films (or plates) with any targeted dispersive property, including those with no wavelength dependence for the entire visible range. In particular, this invention deals with specific design of films with broadband (achromatic) quarterwave and halfwave retardation.
    Type: Grant
    Filed: January 11, 2007
    Date of Patent: June 28, 2011
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu
  • Patent number: 7961276
    Abstract: In the liquid crystal display device of the present invention, a circular polarizer is provided to each of a pair of substrates that hold a liquid crystal layer, wherein the circular polarizer on the display surface side is composed of a polarizer, ?/2 plate in which Rth>0, and a ?/4 plate in which Rth<0; and the circular polarizer on the backlight side is composed of a polarizer, a ?/2 plate in which Rth<0, and a ?/4 plate in which Rth>0. Rth is a retardation in the thickness direction of a ?/2 plate or a ?/4 plate. A reduction is achieved in the absolute value of the sum of the Rth between the ?/2 plate for which Rth>0 and the ?/2 plate for which Rth<0, and in the absolute value of the sum of the Rth between the ?/4 plate for which Rth<0 and the ?/4 plate for which Rth>0.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: June 14, 2011
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Jin Matsushima, Ken Sumiyoshi, Shin-Ichi Uehara
  • Publication number: 20110128482
    Abstract: The invention relates to a liquid-crystal display device comprising a front-side polarizing element, a rear-side polarizing element, a liquid-crystal cell, a front-side retardation region, and a rear-side retardation region composed of one or more retardation layers disposed between the rear-side polarizing element and the liquid-crystal cell wherein retardation along the thickness direction of the front-side retardation region and the rear-side retardation region, Rthfront (?), and Rthrear (?), and the internal haze of the front-side retardation region and the rear-side retardation region, Hzfron and Hzrear, satisfy the following formula (1) or (2): Rthfront (?)>Rthrear(?), and Hzfront<Hzrear, ??(1) Rthfront (?)<Rthrear (?), and Hzfron>Hzrear.
    Type: Application
    Filed: November 30, 2010
    Publication date: June 2, 2011
    Applicant: FUJIFILM Corporation
    Inventor: Makoto ISHIGURO
  • Patent number: 7952658
    Abstract: An in-plane-switching-mode (IPS) LCD device includes a TFT substrate and a CF substrate sandwiching therebetween an LC layer, and a pair of polarizing films sandwiching therebetween the substrates and the LC layer. Each polarizing film has a polarization layer and a protective layer. An optical compensation layer having a birefringence is disposed between the light-emitting-side polarizing film and to the CF substrate. The optical compensation layer has an in-plane retardation of N1 satisfying the following relationship: 83.050?0.810×D1?N1?228.090?0.74D1 in the range of 0<D1?80 ?m, wherein D1 is the thickness of the protective layer of the light-incident-side polarizing film.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: May 31, 2011
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Hiroshi Nagai, Hidenori Ikeno
  • Patent number: 7940358
    Abstract: Provided are an LCD device that can control a viewing angle freely and a manufacturing method thereof. The LCD device includes a first substrate, a second substrate, and an LC layer interposed between the first and second substrates. The LCD device further includes red, green, blue, and viewing angle controlling subpixels. These subpixels are driven in a VA mode. The red, green, and blue subpixels have a transflective structure. The viewing angle controlling subpixel has a transmissive or transflective structure.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: May 10, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Hyun Suk Jin, Hyung Seok Jang, Tae Han Kim
  • Patent number: 7936425
    Abstract: A transflective liquid crystal display device includes a liquid crystal film and a polarizing plate on a backlight source side. A transflective liquid crystal display device includes an uniaxially anisotropic film (a quarter wave plate) and a polarizing plate on a visual confirmation side. The liquid crystal film has the nematic hybrid orientation, in which a polymeric liquid crystal substance formed in a liquid state is fixed. The optical axis of the anisotropic film is disposed to be orthogonal or substantially orthogonal to that of the liquid crystal film.
    Type: Grant
    Filed: November 28, 2005
    Date of Patent: May 3, 2011
    Assignee: NEC LCD Technologies, Ltd.
    Inventor: Kenichirou Naka
  • Publication number: 20110069257
    Abstract: An optical laminate having layer A having a resin having a negative intrinsic birefringence and at least one layer B having a transparent resin, having substantially no orientation and laminated at least on one face of layer A and satisfies a relation |Re(A)|>|Re(B)|, wherein Re(A) and Re(B) represent in-plane retardations of layer A and layer B, respectively, measured with light having a wavelength of 400 to 700 nm, an optical element having a laminate of the optical laminate and a polarizer plate, and a liquid crystal display device using at least one sheet of the optical laminate. In the liquid crystal display device, optical compensation can be made in accordance with the mode of the liquid crystal display by the three dimensional control of the refractive index, and the liquid crystal display device provides an image display with liquid crystals exhibiting small change in the phase contrast depending on the viewing angle.
    Type: Application
    Filed: November 30, 2010
    Publication date: March 24, 2011
    Inventors: Shunsuke YAMANAKA, Kohei Arakawa
  • Patent number: 7911570
    Abstract: The present invention provides a liquid crystal display device comprising at least: a backlight; a polarizer; a first optically anisotropic layer with a retardation of 210 to 300 nm at a wavelength of 550 nm; a second optically anisotropic layer with a retardation of 50 to 140 nm at a wavelength of 550 nm; a third optically anisotropic layer with negative optical anisotropy; a liquid crystal cell comprising upper and lower substrates facing each other and a liquid crystal layer sandwiched between the upper and lower substrates; a fourth optically anisotropic layer with a retardation of 50 to 140 nm at a wavelength of 550 nm; a first optically anisotropic layer with a retardation of 210 to 300 nm at a wavelength of 550 nm; and a polarizer, arranged in piles in this order from the backlight, the second optically anisotropic layer comprising at least a liquid crystal film with a fixed nematic hybrid liquid crystal orientation structure.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: March 22, 2011
    Assignee: Nippon Oil Corporation
    Inventors: Tetsuya Uesaka, Satoru Ikeda
  • Publication number: 20110051062
    Abstract: The present invention provides a method for easily producing at low cost a liquid crystal display device which can achieve a higher contrast ratio in a wide viewing angle range, and a liquid crystal display device. The present invention relates to a method for producing a liquid crystal display device including a first polarizer, a first birefringent layer, a liquid crystal cell, a second birefringent layer, and a second polarizer in this order. The production method comprises at least one of the following first and second steps. The first step includes: laterally stretching a raw film for the first birefringent layer including a material with positive intrinsic birefringence to produce the first birefringent layer; and bonding the first polarizer and the first birefringent layer by roll-to-roll processing.
    Type: Application
    Filed: October 30, 2008
    Publication date: March 3, 2011
    Inventor: Akira Sakai
  • Patent number: 7868979
    Abstract: A liquid crystal display device includes a liquid crystal display panel to which an OCB mode is applied, and an optical compensation element which optically compensates a retardation of the liquid crystal layer in a predetermined display state in which a voltage is applied to the liquid crystal layer. The optical compensation element includes a polarizer, a first retardation plate which is disposed between the polarizer and the liquid crystal display panel and in which discotic liquid crystal molecules are fixed in a state in which the discotic liquid crystal molecules are hybrid-aligned along a normal direction, and a second retardation plate which is disposed between the polarizer and the first retardation plate and has wavelength dispersion characteristics which are opposite to wavelength dispersion characteristics of an in-plane retardation in the liquid crystal layer.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: January 11, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Mitsutaka Okita, Kazuhiro Nishiyama, Shigesumi Araki
  • Patent number: 7864278
    Abstract: A liquid crystal display device includes a liquid crystal layer which is arranged between first and second aligning films formed on inner sides of first and second substrates, has liquid crystal molecules twist-aligned in a direction from the first aligning film toward the second aligning film when an electric field is not applied between first and second electrodes, and generates retardation of substantially ?/2 with respect to transmitted light. First and second polarizing plates are arranged on outer sides of the first and second substrates. A Transmission axis or an absorption axis of the first polarizing plate is substantially matched with a direction along which the liquid crystal molecules in the vicinity of the first aligning film are aligned when a sufficiently intensive electric field is applied.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: January 4, 2011
    Assignee: Casio Computer Co., Ltd.
    Inventors: Hiroki Sato, Kunpei Kobayashi, Mamoru Yoshida
  • Patent number: 7859622
    Abstract: The present invention provides a retardation layer capable of effectively restraining the display quality deterioration without generating a bright and dark pattern in the display image even when a retardation layer is disposed in between a liquid crystal cell and a polarizing plate. The retardation layer comprises a plurality of minute units (domains) having molecular structure of cholesteric structure. Moreover, in the retardation layer, the helical pitch of the molecular structure is adjusted such that the selective reflected wavelength of the selected reflected light deriving from the molecular structure is shorter than the wavelength of the incident light on the retardation layer.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: December 28, 2010
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Keiji Kashima, Takashi Kuroda
  • Patent number: 7852441
    Abstract: A liquid crystal panel of the present invention comprises at least: a liquid crystal cell comprising a liquid crystal layer containing a liquid crystal molecule that is oriented in homogeneous alignment with no electric field applied thereto; a first polarizer placed on one side of the liquid crystal cell; a first optical element placed between the liquid crystal cell and the first polarizer; and a second polarizer placed on the other side of the liquid crystal cell, wherein the first optical element is substantially optically isotropic, the liquid crystal cell has an initial alignment direction that is substantially parallel to the direction of an absorption axis of the first polarizer, and the absorption axis of the first polarizer is substantially perpendicular to an absorption axis of the second polarizer. The liquid crystal panel shows less discoloration of images even when the screen is viewed from oblique directions.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: December 14, 2010
    Assignee: Nitto Denko Corporation
    Inventors: Shuuji Yano, Kenji Yoda, Kentarou Kobayashi, Masatoshi Tomonaga
  • Patent number: 7850801
    Abstract: A defect detection method of a layered film having a polarizing plate and an optical compensation layer includes steps of: applying light from a light source arranged at the polarizing plate layer side of the film surface of the layered film; a step of imaging a transmitting light image of the layered film by an imaging unit arranged at the optical compensation layer side of the film surface; and a defect detection step for detecting a defect existing on the layered film according to the transmitting light image captured by the imaging unit. The imaging unit performs imaging via an inspection polarizing filter arranged on the optical path between the light source and the imaging unit and adjacent to the imaging unit; and an inspection phase difference filter arranged on the optical path between the light source and the imaging unit and between the inspection polarizing filter and the layered film.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: December 14, 2010
    Assignee: Nitto Denko Corporation
    Inventors: Takamasa Kobayashi, Michihiro Hagiwara, Yuuki Yano, Kouji Shizen
  • Patent number: 7842740
    Abstract: Provided are an optical resin and an optical member using the same, both orientation birefringence and photoelasticity birefringence of the optical material being deadened and generally eliminated. The optical material consists of a composite constituent system of three or more constituents including a copolymerization system of monomer-element number not smaller than two, combination and constituent ratio of the composite constituent system being set so that both orientation birefringence and photoelasticity birefringence of the optical material are deadened at the same time and 5.0×10?5 or less is given under a condition that principal chains of the copolymerization system have degree of orientation equal to 0.03, and further a photoelasticity constant not greater than 1.0×10?12 (Pa?1) is obtained. The composite constituent system may contain an additive containing a low molecular weight compound which has an anisotropic polarizability and can be orientated in a polymer.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: November 30, 2010
    Inventor: Yasuhiro Koike
  • Patent number: 7830481
    Abstract: A first polarizer and a second polarizer have respective absorption axes extending approximately perpendicularly to each other, and a first retardation plate and a third retardation plate have respective slow axes extending approximately perpendicularly to each other. The first retardation plate and the third retardation plate have respective retardations that are approximately equal to each other, and have respective Nz coefficients that are approximately equal to each other. A second retardation plate and a liquid crystal layer in a transmissive display area have a slow axis and an orientation axis, respectively, extending approximately perpendicularly to each other. The second retardation plate and the liquid crystal layer in the transmissive display area have respective retardations that are approximately equal to each other.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: November 9, 2010
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Jin Matsushima, Ken Sumiyoshi
  • Patent number: 7820253
    Abstract: A negative birefringence film prepared from a poly(aryletherimide) which is the reaction product of a dianhydride and a diamine, where the dianhydride is 4,4?-[4,4?-(p-phenyleneoxy)isopropylidene]bis(phthalic anhydride) (BisADA), bis(3,4-dicarboxyphenyl)ether dianhydride (ODPA), 4,4?-bis(3,4-dicarboxyphenoxy)biphenyl dianhydride (BPEDA), 1,4-bis(3,4-dicarboxyphenyloxy)phenyl dianhydride (BPQDA), 3,3?,4,4?-tetracarboxylicbiphenyl dianhydride (BPDA), or 2,2-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3-hexafluoropropane dianhydride (6FDA), alone or a mixture with one or more of: 3,3?,4,4?-tetracarboxylicbiphenyl dianhydride (BPDA), 2,2-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3-hexafluoropropane dianhydride (6FDA); and where the diamine is 1,4-bis(2-trifluoromethyl-4-aminophenoxy)-2,5-di(t-butyl)benzene (BTBDA), 3,3?-dimethyl-4,4?-diamino biphenyl (OTOL), or mixtures thereof and wherein when a mixture of dianhydrides is present, they are present in a molar amount of between 99 to 1 (99:1) and 1 to 99 (1:99), and the film has
    Type: Grant
    Filed: October 4, 2007
    Date of Patent: October 26, 2010
    Assignee: Akron Polymer Systems
    Inventors: Frank Harris, Limin Sun, Dong Zhang, Stephen Z. D. Cheng
  • Publication number: 20100265436
    Abstract: There are provided a liquid crystal layer; a plurality of colorant parts disposed so as to be divided for each of a plurality of pixel areas, and having mutually different wavelengths for transmitted light; a polarizing layer disposed on the light-emitting side of the liquid crystal layer; and a plurality of phase difference members disposed on the light-admitting side of the polarizing layer and disposed so as to be divided for each of the plurality of pixel areas. With each of the plurality of phase difference members, at least one of birefringence and thickness is varied for the plurality of phase difference members to adjust the retardation value so that, of the light that is incident on the polarizing layer, the polarization state of light whose wavelength allows the light to be transmitted by the colorant parts that correspond to the phase difference members is brought closer to that of linearly polarized light that oscillates in a designated direction.
    Type: Application
    Filed: April 1, 2010
    Publication date: October 21, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiromi SAITO
  • Patent number: 7808591
    Abstract: A display device for displaying a three dimensional image such that different views are displayed according to the viewing angle. The display device includes a display panel having separately addressable pixels for displaying the image, where the pixels are grouped such that different pixels in a group correspond to different views. The display device further includes a retarder in optical association with the display panel. The retarder includes retarder pixels, where at least one retarder pixel is associated with each corresponding pixel in the display panel. Optical parameters of the retarder pixels are varied as function of the viewing angle associated with the corresponding pixel in the display panel.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: October 5, 2010
    Assignee: Koninklijke Philips Electronics, N.V.
    Inventors: Gerardus P. Karman, Volker Schoellmann
  • Patent number: 7804568
    Abstract: A liquid crystal display device includes a first substrate having one surface on which a first electrode is provided, a second substrate which is provided with a second electrode, and a liquid crystal layer which is interposed between the first and second substrates. Negative dielectric anisotropy homeotropic aligning films are formed on mutually faced surfaces of the first and second electrodes, respectively. A pair of polarizing plates are arranged on a side of the other surface opposite to the one surface of each substrate. And a pair of optical compensation layers are arranged respectively between the other surfaces of the substrates and the polarizing plates, and give a retardation having a value which is substantially ¼ of a wavelength ? of transmitted visible light to the transmitted visible light.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: September 28, 2010
    Assignee: Casio Computer Co., Ltd.
    Inventor: Kunpei Kobayashi
  • Patent number: 7777846
    Abstract: A liquid crystal display device includes a liquid crystal layer which is arranged between first and second aligning films formed on inner sides of first and second substrates, has liquid crystal molecules twist-aligned in a direction from the first aligning film toward the second aligning film when an electric field is not applied between first and second electrodes, and generates retardation of substantially ?/2 with respect to transmitted light. First and second polarizing plates are arranged on outer sides of the first and second substrates. A Transmission axis or an absorption axis of the first polarizing plate is substantially matched with a direction along which the liquid crystal molecules in the vicinity of the first aligning film are aligned when a sufficiently intensive electric field is applied.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: August 17, 2010
    Assignee: Casio Computer Co., Ltd.
    Inventors: Hiroki Sato, Kunpei Kobayashi, Mamoru Yoshida
  • Patent number: 7773174
    Abstract: A wide viewing angle compensation polarizing plate of the invention comprises a laminate comprising an optical film (1) that is formed of an obliquely oriented material exhibiting optically-negative uniaxiality, an anisotropic light-scattering film (2) and a polarizer (3). The wide viewing angle compensation polarizing plate can widen viewing angle characteristics both in the lateral and vertical directions with respect to the direction of the normal to the screen when used in liquid crystal displays.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: August 10, 2010
    Assignee: Nitto Denko Corporation
    Inventors: Kiichi Shimodaira, Hiroyuki Okada, Tatsuya Oosuka, Yuuichi Nishikouji
  • Patent number: 7764338
    Abstract: There are provided a method of producing a polarizing plate with an optical compensation layer having excellent adhesiveness between a polarizer-protective film and a polarizer without deterioration of the optical compensation layer. The method of producing a polarizing plate with an optical compensation layer includes: laminating an optical compensation layer on one side of a polarizer-protective film via a photo-curing adhesive layer; irradiating UV light toward the other side of the polarizer-protective film by a metal halide lamp or an ultrahigh pressure mercury lamp; and laminating a polarizer on the side of the polarizer-protective film on which the optical compensation layer is not formed.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: July 27, 2010
    Assignee: Nitto Denko Corporation
    Inventors: Yoshitsugu Kitamura, Hiroyuki Okada
  • Patent number: 7760299
    Abstract: A method of improving the viewing angle of a vertically-aligned liquid crystal display device is presented. The method involves designing a uniaxial compensation film to provide a retardation value of 200 nm or less for light having a wavelength of about 550 nm. Using this uniaxial compensation film, a display device can be built by obtaining a liquid crystal panel with liquid crystal molecules contained between glass substrates, coupling the uniaxial compensation film to at least one of the glass substrates, and coupling a polarization film and electrodes to the compensation film. Preferably, the uniaxial compensation film has a thickness less than or equal to 50 microns. Where there are multiple compensation films, the total thickness and the total retardation values should be considered.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: July 20, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Tae-Hwan Kim, Sang-Il Kim, Young-Chol Yang
  • Patent number: RE43217
    Abstract: A liquid crystal display device includes a first substrate having one surface on which a first electrode is provided, a second substrate which is provided with a second electrode, and a liquid crystal layer which is interposed between the first and second substrates. Negative dielectric anisotropy homeotropic aligning films are formed on mutually faced surfaces of the first and second electrodes, respectively. A pair of polarizing plates are arranged on a side of the other surface opposite to the one surface of each substrate. A pair of optical compensation layers are arranged respectively between the other surfaces of the substrates and the polarizing plates, and give a retardation having a value which is substantially ¼ of a wavelength ? of transmitted visible light to the transmitted visible light.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: February 28, 2012
    Assignee: Casio Computer Co., Ltd.
    Inventor: Kunpei Kobayashi