Having Particular Birefringence Or Retardation Patents (Class 349/181)
  • Patent number: 10824002
    Abstract: A display apparatus includes a display device configured to display an original image at an original image display position, a second array of a lens array or a pinhole array, and a first array of a lens array or a pinhole array disposed distant from the display device and the second array between the display device and the second array. The first array is configured to form a plurality of elemental images generated from the original image at positions between the first array and the second array. The pitch of the plurality of elemental images is different from lens pitch or pinhole pitch of the second array. The second array is configured to integrate the plurality of elemental images to generate a single reproduced image of the original image.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: November 3, 2020
    Assignee: TIANMA JAPAN, LTD.
    Inventors: Ayuko Imai, Ken Sumiyoshi, Yukie Keicho
  • Patent number: 10647061
    Abstract: A method of forming a three dimensional (3D) object is disclosed. The method may involve providing a volume of photo-curable resin contained within an optically transparent resin container, and simultaneously directing optical projections from an optical subsystem at a plurality of angles ? through the volume of photo-curable resin. The optical beams are directed about a z axis extending through the volume of photo-curable resin. Each of the projections is provided with a calculated 2D spatial intensity function which creates a 3D intensity map. The projections act over a fixed temporal exposure period, during which the net exposure dose is sufficient to cure select portions of the volume of photo-curable resin, and to leave other portions uncured, to form a desired 3D part.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: May 12, 2020
    Assignees: Lawrence Livermore National Security, LLC, The Regents of the University of California
    Inventors: Brett Kelly, Robert Panas, Maxim Shusteff, Christopher Spadaccini, Hayden Taylor, Indrasen Bhattacharya
  • Patent number: 10473996
    Abstract: A liquid crystal display device comprises: a first liquid crystal cell being a lateral electric field driven type; a second liquid crystal cell being a lateral electric field driven type; a first polarizing plate and a second polarizing plate, which are disposed so as to sandwich the first liquid crystal cell; and a third polarizing plate and a fourth polarizing plate, which are disposed so as to sandwich the second liquid crystal cell. The liquid crystal display device is configured such that rotation of a liquid crystal molecule of the first liquid crystal cell and rotation of a liquid crystal molecule of the second liquid crystal cell cancel and compensate for a hue change of the first liquid crystal cell or the second liquid crystal cell when viewed from a predetermined direction.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: November 12, 2019
    Assignee: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventor: Kikuo Ono
  • Patent number: 10421217
    Abstract: A 3D printing device is provided, which includes a display panel including a plurality of pixels; a storage apparatus arranged in a light path of the display panel for storing a liquid light curable material, and a control component for controlling the display panel to perform imaging. The 3D printing device further includes a microlens array arranged in the light path between the display panel and the storage apparatus for adjusting the light path. The display panel further includes a light blocking matrix arranged at a non-pixel area of the display panel to separate the plurality of pixels from each other. The microlens array includes a plurality of microlenses arranged on the light blocking matrix, each microlens of the plurality of microlenses covers a single pixel of the plurality of pixels and light blocking layers of the light blocking matrix adjacent to the single pixel.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: September 24, 2019
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventor: Wenbo Li
  • Patent number: 9651820
    Abstract: A liquid crystal display device includes a liquid crystal panel, a polaroid for polarizing light positioned on a light incident side of the liquid crystal panel, and a polarization analyzer positioned on a light emission side of the liquid crystal panel. The polarization analyzer includes a transparent plate. The transparent plate being arranged at a set angle with a light emission surface of the liquid crystal panel, such that the transparent plate analyzes polarization of light emitted from the light emission surface of the liquid crystal panel. Because the polaroid is used only on the light incident side of the liquid crystal panel, while the transparent plate is used instead of a polaroid on the light emission side of the liquid crystal panel, a reduction in the material cost of the liquid crystal display device can be achieved.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: May 16, 2017
    Assignee: Boe Technology Group Co., Ltd.
    Inventors: Pan Li, Yanbing Wu, Wenbo Li, Chunyan Ji, Xiangyan Zhang
  • Patent number: 9645406
    Abstract: A polarizing control film for two-dimensional (2D) display mode/three-dimensional (3D) display mode conversion in a stereoscopic display device, can include a film substrate, a plurality of first and second electrodes alternately arranged on the film substrate, and a liquid crystal layer disposed on the film substrate having the first and second electrodes, the liquid crystal layer being filled with nano liquid crystals exhibiting optical isotropy when no voltages are applied to the first and second electrodes and optical anisotropy when voltages are applied to the first and second electrodes.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: May 9, 2017
    Assignee: LG Display Co., Ltd.
    Inventors: A-Ra Yoon, Hoon Kang, Young-Bok Lee
  • Patent number: 9618794
    Abstract: There is provided a liquid crystal display apparatus in which a retardation ?nd of a liquid crystal layer is greater than 2 ?m. Absorbing axes of the first polarizer and the second polarizer are in parallel to an alignment direction of the liquid crystal molecules on surfaces of the first substrate or the second substrate. A slow axis of the optical film and the absorbing axes of the first polarizer and the second polarizer are in parallel to each other or orthogonal to each other. An in-plane retardation of the optical film is from 300 nm to 430 nm.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: April 11, 2017
    Assignee: STANLEY ELECTRIC CO., LTD.
    Inventors: Manabu Hamamoto, Yoshihisa Iwamoto
  • Patent number: 9465253
    Abstract: A liquid crystal display apparatus of the present invention includes: a liquid crystal cell including a pair of substrates provided with a color filter on one substrate, and a liquid crystal layer as a display medium arranged between the substrates; and an optical compensation element including at least an optical compensation layer. The substrate provided with the color filter has a haze value of more than 10%, and the optical compensation element and the liquid crystal layer are arranged on the same side with respect to the color filter.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: October 11, 2016
    Assignee: NITTO DENKO CORPORATION
    Inventor: Yoshiyuki Kiya
  • Patent number: 9305479
    Abstract: Provided is a detection circuit for dark points on a panel, comprising a preset voltage generation module and a selection circuit module, wherein the preset voltage generation module is connected with the selection circuit module and is used for transferring N preset voltages to the selection circuit module, and the selection circuit module comprises N inputting terminals for receiving the N preset voltages, respectively, an outputting terminal and a strobe switch for strobing the outputting terminal with one of the N inputting terminals, N?2. The circuit according to the embodiments of the present disclosure can detect the dark point defect caused by remains in active layers effectively in a panel state and prevent the panels having such dark point defects from being incorporated into modules, so that a waste of cost is avoid and a detection capability in a detection procedure for the panel is increased.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: April 5, 2016
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Zhengyong Chu, Se Hyuck Park, Chuanxiong Chen
  • Patent number: 9105615
    Abstract: An electronic device comprises a display stack that includes an active matrix display operable using thin film transistor (TFT) circuitry. The display stack also includes a light guide layer capable of illuminating the active matrix display. A glass substrate of the active matrix display has a first side and a second side opposite the first side, wherein the glass substrate includes the TFT circuitry disposed on the first side and one or more through-glass vias that electronically connect portions of the TFT circuitry disposed on the first side of the glass substrate to one or more electronic connectors or electronic circuitry disposed on the second side of the glass substrate.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: August 11, 2015
    Assignee: Amazon Technologies, Inc.
    Inventor: Hany Mounir Ghali
  • Patent number: 8994914
    Abstract: There is provided an integrated wide viewing film including: a first film having an optical axis located in-plan; and a second film having an optical axis located in a thickness direction thereof, and inclined at a predetermined angle in an in-plane direction. The IPS-LCD employing the integrated wide viewing film can be significantly improved in a contrast ratio in a diagonal direction.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: March 31, 2015
    Assignee: LG Chem, Ltd.
    Inventors: Jun-Won Chang, Belyaev Sergey, Malimonenko Nikolay
  • Patent number: 8867001
    Abstract: A patterned retardation film including a base substrate, a patterned resin layer and a liquid crystal layer is provided. The patterned resin layer having plurality of first areas and a plurality of second areas is disposed on the base substrate. The combination of the first and second areas is a grating-like stripe structure. The patterned resin layer includes an aligning micron structure. The aligning micron structure includes a plurality of first sub micron grooves and a plurality of second sub micron grooves respectively located in the first areas and the second areas. The liquid crystal layer is disposed on the patterned resin layer and aligned with the aligning micron structure. The liquid crystal layer disposed above the first areas provides a first phase retardation. The liquid crystal layer disposed above the second areas provides a second phase retardation.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: October 21, 2014
    Assignee: Benq Materials Corp.
    Inventors: Fung-Hsu Wu, Lung-Hai Wu
  • Patent number: 8767151
    Abstract: There is provided an integrated wide viewing film including: a first film having an optical axis located in-plan; and a second film having an optical axis located in a thickness direction thereof, and inclined at a predetermined angle in an in-plane direction. The IPS-LCD employing the integrated wide viewing film can be significantly improved in a contrast ratio in a diagonal direction.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: July 1, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Jun-Won Chang, Belyaev Sergey, Malimonenko Nikolay
  • Patent number: 8743326
    Abstract: There is provided an integrated wide viewing film including: a first film having an optical axis located in-plan; and a second film having an optical axis located in a thickness direction thereof, and inclined at a predetermined angle in an in-plane direction. The IPS-LCD employing the integrated wide viewing film can be significantly improved in a contrast ratio in a diagonal direction.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: June 3, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Jun-Won Chang, Belyaev Sergey, Malimonenko Nikolay
  • Patent number: 8675154
    Abstract: A liquid crystal display device includes a liquid crystal display panel, a first polarizer between the liquid crystal display panel and a back light behind the liquid crystal display panel, the first polarizer including a first polarization film having a first transmission axis and a first phase-difference film having a first polarization axis, a second polarizer in front of the liquid crystal display panel, the second polarizer including a second polarization film having a second transmission axis intersecting the first transmission axis, a second phase-difference film having a second polarization axis intersecting the first polarization axis, and a third phase-difference film having a third polarization axis, and a substrate structure above the liquid crystal display panel and the second polarizer, the substrate structure includes a third polarizer in the substrate structure, the third polarizer including a fourth phase-difference film having a fourth polarization axis intersecting the third polarization ax
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: March 18, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventor: Won Sang Park
  • Patent number: 8520176
    Abstract: A method for manufacturing a stereoscopic display module including following steps is provided. A display module is provided. A first retardation film is attached on the display module with a heat-resisting adhesive layer. After attaching the first retardation film on the display module with the heat-resisting adhesive layer, a partial region of the first retardation film is heated to vanish a phase retardation property. The partial region includes a plurality of sub-regions spaced at intervals. A stereoscopic display module and a manufacturing system thereof are also provided.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: August 27, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Lang-Chin Lin, Chun-Jung Chen, Chao-Hsu Tsai, Tzuan-Ren Jeng, Golden Tiao
  • Patent number: 8350999
    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: Grant
    Filed: November 30, 2010
    Date of Patent: January 8, 2013
    Assignee: FUJIFILM Corporation
    Inventor: Makoto Ishiguro
  • Patent number: 8314918
    Abstract: A display includes a display device having a first polarizer and a second polarizer or a reflector, and a display layer disposed between the first polarizer and the second polarizer or the reflector. A liquid crystal layer is disposed between the display layer and one of the first polarizer and the second polarizer or reflector. The liquid crystal molecules of at least one region of the liquid crystal layer are switchable between a first state in which the display has a first display mode with a first viewing angle range and a second state in which the display has a second display mode having a second viewing angle range smaller than the first viewing angle range.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: November 20, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Diana Ulrich Kean, Anthony John Carver, Paul A. Gass, Heather Ann Stevenson, Emma Jayne Walton
  • Patent number: 8305545
    Abstract: There is provided an integrated wide viewing film including: a first film having an optical axis located in-plan; and a second film having an optical axis located in a thickness direction thereof, and inclined at a predetermined angle in an in-plane direction. The IPS-LCD employing the integrated wide viewing film can be significantly improved in a contrast ratio in a diagonal direction.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: November 6, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Jun-Won Chang, Belyaev Sergey, Malimonenko Nikolay
  • Patent number: 8294852
    Abstract: An E-type polarizing layer is provided between a pair of orthogonally oriented O-type polarizing layers, and alternatively, an O-type polarizing layer and an E-type polarizing layer which are oriented orthogonal to each other are provided. When a liquid crystal layer has a slow axis, the E-type polarizing layer is disposed so that an absorption axis thereof is orthogonal to the slow axis. Therefore, a liquid crystal display device having a wide viewing angle is realized in which a contrast ratio is improved by suppressing a light leakage occurring when observed from an oblique direction.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: October 23, 2012
    Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masaya Adachi, Takato Hiratsuka
  • Patent number: 8212986
    Abstract: An LCD device comprises upper substrate, lower substrate, and a liquid crystal (LC) cell disposed therebetween. The LC cell comprises liquid crystals. According to the present invention, in the LCD device which applies voltage to the liquid crystals to control transmissive light for proceeding display, the liquid crystals are applied with a voltage larger than a predetermined voltage for proceeding display. The reflect light and the transmissive light of the liquid crystals are the predetermined color under a condition without applying the voltage thereto.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: July 3, 2012
    Assignee: Chimei Innolux Corporation
    Inventor: Minoru Shibazaki
  • Patent number: 8027014
    Abstract: The invention provides: an optical element that includes a birefringence functional layer constituted of a polymerizable liquid crystal material, in which the birefringence functional layer is formed directly or indirectly on a substrate, and in a post-process carried out thereafter, alignment and characteristics of the birefringence functional layer are not disturbed, with the result that a high quality birefringence control function can be exerted; a liquid crystal display device provided with the optical element; a method of evaluating a birefringence functional layer that is not disturbed in the alignment and physical properties by the post-process; and a method of producing the optical element.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: September 27, 2011
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventor: Yuji Nakatsugawa
  • Patent number: 7982828
    Abstract: The present invention provides a polarization switching liquid crystal element 1 having TN liquid crystal 7 retained between two transparent substrates 2a and 2b for transmitting at least visible polarized light with the polarized light transmission axis selectively rotated by 90 degrees when a voltage is selectively applied to the TN liquid crystal 7, wherein a phase difference u of said TN liquid crystal 7 is defined by the following equation: u=2×?n×d/?, where ?n is the refractive index anisotropy of said TN liquid crystal 7, d is the thickness of said TN liquid crystal 7, and ? is the wavelength of said polarized light, and a transmittance T of said polarization switching liquid crystal element measured with polarization plates on the incident and outgoing sides is defined by the following equation: T=(½)×sin2{?(1+u2)1/2/2}/(1+u2), and wherein the phase difference u includes a value 1.7 and the transmittance T is 0.1 or lower when the ? ranges from 400 nm to 700 nm.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: July 19, 2011
    Assignee: Olympus Corporation
    Inventor: Kazuya Yamanaka
  • Patent number: 7914861
    Abstract: A liquid crystal composite is provided, which includes a liquid crystal compound and a nanoparticle. The liquid crystal compound is an optically compensated birefringence (OCB) liquid crystal compound. The nanoparticle has at least one acrylic functional group on the main chain or side chain thereof. The nanoparticle is 0.1-2 wt % by weight of the liquid crystal composite.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: March 29, 2011
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Hong-Cheu Lin, Wei-Hong Chen, Ling-Yung Wang, Chieh-Yin Tang, Szu-Fen Chen
  • Patent number: 7817226
    Abstract: A liquid crystal display device comprises: a first substrate having a first polarization layer on a light incident side; a second substrate having a second polarization layer on a light outgoing side; a liquid crystal layer disposed between the first and the second substrates; a first birefringent film disposed between the first and the second polarization layers; a second birefringent film disposed between the first birefringent film and the second polarization layer; and wherein the liquid crystal layer has a property that a refractive index anisotropy is induced in it by an electric field applied between the pixel electrodes and the common electrode; wherein in-plane retarded phase axes of the first and the second birefringent films form an angle of from 88 degrees to 92 degrees with the first polarization layer; wherein the first birefringent films have Nz coefficients greater than 0.5 and smaller than 0.5, respectively.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: October 19, 2010
    Assignee: Hitachi Displays, Ltd.
    Inventors: Daisuke Kajita, Ikuo Hiyama, Shintaro Takeda
  • Patent number: 7782425
    Abstract: A liquid crystal display includes a TFT array panel, a color filter panel, a liquid crystal layer in an OCB mode, a pair of compensation films provided on outer surfaces of the TFT array panel and the color filter panel, a pair of polarization films provided on outer surfaces of the compensation films, and so on. When the wavelength dispersion of the liquid crystal layer is larger than the wavelength dispersion of the first and the second compensation films, the cell gap on the red pixel area>the cell gap on the green pixel area>the cell gap on the blue pixel area. On the contrary, when the wavelength dispersion of the liquid crystal layer is smaller than the wavelength dispersion of the first and the second compensation films, the cell gap on the red pixel area<the cell gap on the green pixel area<the cell gap on the blue pixel area.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: August 24, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jang-Kun Song, Chang-Hun Lee
  • Patent number: 7773191
    Abstract: The present invention provides a liquid crystal display device comprising a liquid crystal layer sandwiched between an upper substrate and a lower substrate having a twist angle in the range of about 40 to 65 degrees and a light diffusive reflective electrode having recesses and projections provided on the lower substrate wherein a product of the height of the recesses and projections and a birefringence of the liquid crystal layer is in the range of about 10 to 53 nm at the twist angle of about 40 degrees and about 10 to 64 nm at the twist angle of about 65 degrees, respectively.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: August 10, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Osamu Itou, Shinichi Komura
  • Patent number: 7626677
    Abstract: A liquid crystal display apparatus includes a first protective layer, a first polarizing layer, a second protective layer, an active device array substrate, an opposite substrate, a twisted nematic liquid crystal layer, a third protective layer, a second polarizing layer and a fourth protective layer. The first polarizing layer is disposed between the first and the second protective layers; the active device array substrate is disposed over the second protective layer. The twisted nematic liquid crystal layer is disposed between the opposite substrate and the active device array substrate. The third protective layer is disposed on the opposite substrate, and the second polarizing layer is disposed between the third and the fourth protective layers. The second protective layer has an in-plane and an out-of-plane retardation values. The in-plane retardation value is between 1 and 10 nanometers, and the out-of-plane retardation value is between 50 and 130 nanometers.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: December 1, 2009
    Assignee: Au Optronics Corporation
    Inventors: Wen-Fang Sung, Ying-Che Lan, Chih-Haw Wang, Pei-Hsun Wu
  • Patent number: 7609346
    Abstract: A liquid crystal display device includes a liquid crystal display panel which is configured such that a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°±10°, is held between a first substrate and a second substrate, and an optical element which is provided on an outer surface of the second substrate. The optical element includes a polarizer plate, a first retardation plate which imparts a phase difference of a ½ wavelength, and a second retardation plate which imparts a phase difference of a ¼ wavelength, and a retardation value ?n·d of the liquid crystal layer is set at 200 ±30 nm, where ?n is a refractive index anisotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer.
    Type: Grant
    Filed: December 4, 2006
    Date of Patent: October 27, 2009
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventor: Kazuhiro Joten
  • Patent number: 7599040
    Abstract: A color liquid crystal display device includes a pair of oppositely disposed substrates each of which is provided with an electrode and has been subjected to homeotropic alignment treatment, and chiral nematic liquid crystal disposed between the pair of oppositely disposed substrates. The chiral nematic liquid crystal is capable of causing birefringence leading to a change in brightness and a change in hue depending on a voltage applied between the electrodes. The liquid crystal is twistedly aligned under electric field application to change a twisted angle, so that a fluctuation in birefringence with temperature is compensated.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: October 6, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasufumi Asao
  • Patent number: 7525632
    Abstract: A liquid crystal display (LCD) device includes an LCD panel provided with two substrates and a liquid crystal layer formed between the two substrates to display an image, and a backlight formed on a rear surface of the LCD panel to provide light, wherein the properties of liquid crystal in the liquid crystal layer are optimized for a driving temperature of the LCD panel between about 30° C. and about 70° C.
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: April 28, 2009
    Assignee: LG Display Co., Ltd.
    Inventor: Su Hyun Park
  • Patent number: 7511792
    Abstract: An IPS-LCD, in which the direction of an optical axis and retardation values are adjusted according to the disposition of a phase retardation film replacing one protective film, obtains a contrast ratio similar to that of an IPS-LCD having upper and lower protective films, and has a small thickness. The IPS-LCD includes first and second polarizing plates (1, 2), an IPS panel (3), and a first protective film. Absorption axes (4, 5) of the first and second polarizing plates (1, 2) are orthogonal to each other, and an optical axis of a liquid crystal in the IPS panel (3) and the absorption axis (4) are parallel with each other. A second phase retardation film, obtained by coating a biaxial film (17) with a uniaxial C film (11), is disposed between the second polarizing plate (2) and the IPS panel (3) and is used as a second protective film.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: March 31, 2009
    Assignee: LG Chem, Ltd.
    Inventors: Jun Won Chang, Byoung Kun Jeon, Soo Jin Jang
  • Patent number: 7443585
    Abstract: A polarization component, capable of efficiently reflecting an obliquely transmitted light beam toward a light source without degrading the transmission-polarization property of a perpendicular incident light beam, is provided. A C-plate having an oblique retardation of at least ?/8 with respect to a light beam inclined by at least 30° is disposed between at least two reflective circular polarizer layers whose selective reflection wavelength bands of polarized light overlapping each other. A combination of a reflective linear polarizer and a quarter wavelength plate may be used instead of the reflective circular polarizer. Alternatively, a combination of two reflective linear polarizer layers and two quarter wavelength plate layers (Nz?2) disposed therebetween can provide a similar effect. Further, a combination of two reflective linear polarizer layers and a half wavelength plate (Nz?1.5) disposed therebetween may be used.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: October 28, 2008
    Assignee: Nitto Denko Corporation
    Inventors: Kazutaka Hara, Minoru Miyatake
  • Patent number: 7433012
    Abstract: A liquid crystal display apparatus includes a liquid crystal panel including a pair of polarizers, and a back light provided at a back side of said liquid crystal panel. The liquid crystal panel is an active matrix type liquid crystal panel enabling display and has a characteristic of spectral transmittance required to satisfy the following equation, ×>y, when a drive voltage is applied thereto so as to vary from a dark state to a light state, in which “x” is a value of the transmittance in the liquid crystal panel at a wavelength which corresponds to one of 490 nm and 500 nm, and “y” is a value of the transmittance in the liquid crystal panel at a wavelength which corresponds to 545 nm.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: October 7, 2008
    Inventors: Yuka Utsumi, Katsumi Kondo, Ikuo Hiyama, Osamu Itoh, Masahito Ohe, Kazuhiko Yanagawa, Keiichiro Ashizawa
  • Publication number: 20080225187
    Abstract: The present invention provides a polarization switching liquid crystal element 1 having TN liquid crystal 7 retained between two transparent substrates 2a and 2b for transmitting at least visible polarized light with the polarized light transmission axis selectively rotated by 90 degrees when a voltage is selectively applied to the TN liquid crystal 7, wherein a phase difference u of said TN liquid crystal 7 is defined by the following equation: u=2×?n×d/?, where ?n is the refractive index anisotropy of said TN liquid crystal 7, d is the thickness of said TN liquid crystal 7, and ? is the wavelength of said polarized light, and a transmittance T of said polarization switching liquid crystal element measured with polarization plates on the incident and outgoing sides is defined by the following equation: T=(½)×sin2{?(1+u2)1/2/2}/(1+u2), and wherein the phase difference u includes a value 1.7 and the transmittance T is 0.1 or lower when the ? ranges from 400 nm to 700 nm.
    Type: Application
    Filed: April 29, 2008
    Publication date: September 18, 2008
    Applicant: OLYMPUS CORPORATION
    Inventor: Kazuya Yamanaka
  • Publication number: 20080106689
    Abstract: A display element of the present invention includes: a pair of substrates which are opposed to each other; and a substance layer, which is sandwiched between the substrates, exhibiting an optical isotropy when no electric field is applied, while exhibiting an optical anisotropy when an electric field is applied, and the display element performs display operation by applying an electric field to between the substrates. The substance layer includes a liquid crystalline medium exhibiting a nematic liquid crystal phase, and it is ?n×|??|?1.9, where ?n is a refractive index anisotropy at 550 nm in a nematic phase of the liquid crystalline medium, and |??| is an absolute value of a dielectric anisotropy at 1 kHz in the nematic phase of the liquid crystalline medium. The display element and a display device including the display element realize a fast response speed and a low driving voltage and driving in a wide temperature range.
    Type: Application
    Filed: August 24, 2005
    Publication date: May 8, 2008
    Inventors: Iichiro Inoue, Seiji Shibahara, Koichi Miyachi, Shoichi Ishihara
  • Patent number: 7345654
    Abstract: A three-dimensional image display apparatus includes an image display configured to output image light which arrays a plurality of pixels and has polarization, a lens array arranged in front of the image display, configured to function as lens at light which has a 1st polarization direction, and not to function as lens at light which has a 2nd polarization direction differed from the 1st polarization direction, and a birefringent phase modulator placed between the image display and the lens array and configured to rotate a polarization plane of the image light.
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: March 18, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuki Taira, Yuzo Hirayama, Tatsuo Saishu, Rieko Fukushima, Ayako Takagi
  • Patent number: 7333082
    Abstract: An object of the present invention is to provide a small-sized active matrix type liquid crystal display device that may achieve large-sized display, high precision, high resolution and multi-gray scales. According to the present invention, gray scale display is performed by combining time ratio gray scale and voltage gray scale in a liquid crystal display device which performs display in OCB mode. In doing so, one frame is divided into subframes corresponding to the number of bit for the time ratio gray scale. Initialize voltage is applied onto the liquid crystal upon display of a subframe.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: February 19, 2008
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Jun Koyama
  • Patent number: 7259817
    Abstract: The present invention is configured so that it has a first substrate, a second substrate, a liquid crystal layer pinched between the first substrate and second substrate, and a driving unit, wherein a characteristic of a reflectivity versus an applied voltage is a normally closed type and a characteristic of a transmissivity versus an applied voltage is the normally closed type: wherein the first substrate has a common electrode, and an upside polarization plate and upside phase plate on an upper surface; wherein the second substrate has a reflective electrode and transparent electrode connected with an active element, and a downside polarization plate and downside phase plate on a lower surface; wherein the liquid crystal layer has a twist angle not less than 40 degrees and not more than 65 degrees; wherein a retardation of the liquid crystal layer in a reflective display unit is within a range of not less than 230 nm and not more than 300 nm; and wherein a retardation of the liquid crystal layer in a transm
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: August 21, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Osamu Itou, Hiroko Hayata, Kouichi Anno, Shinichi Komura
  • Patent number: 7250923
    Abstract: A three-dimensional image display apparatus includes an image display configured to output image light which arrays a plurality of pixels and has polarization, a lens array arranged in front of the image display, configured to function as lens at light which has a 1st polarization direction, and not to function as lens at light which has a 2nd polarization direction differed from the 1st polarization direction, and a birefringent phase modulator placed between the image display and the lens array and configured to rotate a polarization plane of the image light.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: July 31, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuki Taira, Yuzo Hirayama, Tatsuo Saishu, Rieko Fukushima, Ayako Takagi
  • Patent number: 7236219
    Abstract: The present invention relates to color liquid crystal displays without the use of color filters. By carefully choosing the design parameters of a liquid crystal display, it is possible to obtain vivid colors from the display as a function of the operating voltage.
    Type: Grant
    Filed: November 28, 2003
    Date of Patent: June 26, 2007
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu
  • Patent number: 7193669
    Abstract: A liquid crystal display device includes a display element with a pair of substrates, a liquid crystal layer between the substrates, and an alignment film on a surface of at least one substrate facing the layer; a pair of polarizers on both surfaces of the liquid crystal element to sandwich the liquid crystal element; and at least one optical phase element between at least one of the polarizers and the liquid crystal element, wherein an optical refractive ellipsoid of the optical phase element is tilted clockwise or counterclockwise from the normal of a surface of the optical phase element, wherein at least one of rates of variation of an ordinary refractive index and an extraordinary refractive index of a liquid crystal material of the liquid crystal layer with respect to a wavelength is set in a range where viewing angle dependent coloring does not occur on a screen.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: March 20, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Motohiro Yamahara, Iichiro Inoue
  • Patent number: 7167229
    Abstract: An active matrix drive type liquid crystal display element capable of preventing deterioration of display capability caused by a stripe domain, and a projection type display device using the liquid crystal display element, by which there is provided a projection type display device comprising a light source; a light convergence optical system for guiding a light emitted from said light source to a liquid crystal display element; and a projection optical system for enlarging and projecting a light subjected to light modulation by said liquid crystal display element; wherein the liquid crystal display element is configured by holding a liquid crystal layer between a pair of substrates arranged to face to each other, and a twisted nematic type liquid crystal material used in the liquid crystal layer satisfies dielectric constant anisotropy ?? of 0<??<8 and twist elasticity modulus K22 of K22>6.0 pN when the refractive index anisotropy ?n is 0.16??n?0.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: January 23, 2007
    Assignee: Sony Corporation
    Inventors: Akiko Toriyama, Mieko Suzuki
  • Patent number: 7161647
    Abstract: The invention provides a transflective liquid crystal display device which provides both high-contrast, bright reflective and transmissive displays. The liquid crystal display device of the present invention can include a liquid crystal panel and a backlight. The liquid crystal panel includes a liquid crystal layer, which is disposed between an upper substrate and a lower substrate and whose liquid crystals are disposed in a twisted manner at an angle in the range of from 220 to 270 degrees, an upper retardation film and a lower retardation film, which are disposed above and below the liquid crystal layer so as to sandwich it; an upper polarizer 16 and a lower polarizer, which are disposed on the outer surfaces of their respective retardation films, and a sloping reflective layer. Light impinging upon the upper polarizer from the liquid crystal layer is elliptically polarized light.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: January 9, 2007
    Assignee: Seiko Epson Corporation
    Inventor: Chiyoaki Iijima
  • Patent number: 7123336
    Abstract: An active matrix drive type liquid crystal display element capable of preventing deterioration of display capability caused by a stripe domain, and a projection type display device using the liquid crystal display element, by which there is provided a projection type display device comprising a light source; a light convergence optical system for guiding a light emitted from said light source to a liquid crystal display element; and a projection optical system for enlarging and projecting a light subjected to light modulation by said liquid crystal display element; wherein the liquid crystal display element is configured by holding a liquid crystal layer between a pair of substrates arranged to face to each other, and a twisted nematic type liquid crystal material used in the liquid crystal layer satisfies dielectric constant anisotropy ?? of 0<??<8 and twist elasticity modulus K22 of K22>6.0 pN when the refractive index anisotropy ?n is 0.16??n?0.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: October 17, 2006
    Assignee: Sony Corporation
    Inventors: Akiko Toriyama, Mieko Suzuki
  • Patent number: 7088410
    Abstract: A liquid crystal display device incorporates two phase difference plates stacked together and disposed between a liquid crystal display element and a pair of polarizers, the liquid crystal display element being formed by sandwiching a liquid crystal layer between a pair of electrode substrates, and the polarizers being disposed on one side of the liquid crystal display element. Since the principal refractive indices na, nb, and nc of the phase difference plates are such that na<nb<nc, the phase difference plates exhibit positive refractive index anisotropies. The principal refractive index nb inclines to the normal to the surfaces of the phase difference plates about one of the principal refractive indices na or nc that is parallel to the surfaces.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: August 8, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Motohiro Yamahara, Shigeaki Mizushima
  • Patent number: 7088413
    Abstract: The invention relates to a bistable nematic liquid-crystal device comprising: alignment means, which orient the liquid crystal, means designed to apply electrical signals which allow switching, by breaking the anchoring on at least one of the two substrates, between two distinct textures, and means designed to promote the establishment of that one of the said textures giving the off state in the liquid crystal covering the inter-electrode spaces.
    Type: Grant
    Filed: August 28, 2002
    Date of Patent: August 8, 2006
    Assignee: Nemoptic
    Inventors: Philippe Martinot-Lagarde, Alain Boissier, Jacques Angele, Bertrand Pecout, Ivan N. Dozov
  • Patent number: 7084939
    Abstract: A normally white supertwist nematic liquid crystal display of reflective type is provided. This display comprises a reflector, a layer of chiral nematic liquid crystal having a front aligning surface facing a light source and a rear aligning surface facing the reflector, and a front polarizer. The nematic liquid crystal has an optical retardation (?nd) of the layer and a distribution of directors, wherein the chiral nematic liquid crystal has a twist angle (?) between an alignment direction of the director at the front aligning surface and an alignment direction of the director at the rear aligning surface. The front polarizer is disposed between the layer of chiral nematic liquid crystal and the light source. The front polarizer has a transmission axis forming an angle (?) with the alignment direction of the director at the front aligning surface of the chiral nematic liquid crystal layer. The optical retardation (?nd) and the angle (?) are defined by the following formulas: ?((?)=sign(?)·(47.0?0.4936|?|+2.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: August 1, 2006
    Assignee: Nitto Denko Corporation
    Inventors: Michael V. Paukshto, Serguei Palto
  • Patent number: 7081934
    Abstract: A semitransparent liquid crystal display element comprises a liquid crystal panel composed of a plurality of pixels each having a reflective portion and a transparent portion arranged therein, a first polarizer sheet located on the observer's side of the liquid crystal panel, and a second polarizer sheet located on the opposite side of the liquid crystal panel from the first polarizer sheet, the angle of twist of a liquid crystal molecule which forms each pixel of the liquid crystal panel ranging from 44 degrees to 46 degrees. An angle between an absorption axis of the first polarizer sheet and a major axis of a liquid crystal molecule adjacent thereto ranges from 80 degrees to 85 degrees, and an angle between an absorption axis of the second polarizer sheet and a liquid crystal molecule adjacent thereto ranges from 50 degrees to 55 degrees.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: July 25, 2006
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventor: Kazuhiro Joten
  • Patent number: 7079218
    Abstract: An optically compensated birefringence mode liquid crystal display device includes first and second substrates facing and spaced apart from each other, a liquid crystal material layer between the first and second substrates, the liquid crystal material layer having a splay state when a voltage is not applied and having a bend state when a transition voltage is applied, a first compensation film on an outer surface of the first substrate, a first polarizing plate on the first compensation film, a second compensation film on an outer surface of the second substrate, and a second polarizing plate on the second compensation film, wherein the liquid crystal material layer in the splay state has a first retardation value (R1) satisfying according to: 1.35<R1/?<1.75 the liquid crystal material layer in the bend state has a second retardation value (R2) according to: 0.5<R2/?<0.7 when a white voltage for a white image is applied, and a third retardation value (R3) according to: 0.1<R3/?<0.
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: July 18, 2006
    Assignee: LG.Philips LCD Co., Ltd.
    Inventors: Ku-Hyun Park, Sang-Ho Choi