Having Particular Parameter Of Twist Patents (Class 349/180)
  • Patent number: 10809585
    Abstract: A Pancharatnam Berry Phase (PBP) liquid crystal structure for adjusting or focusing light of a plurality of color channels emitted by a display of a head-mounted display (HMD) comprises a plurality of PBP active elements. Each PBP active element of the structure is configured to act as a half waveplate for light of a corresponding color channel, such that light of the corresponding color channel is adjusted by a predetermined amount. In addition, each PBP active element acts as a one waveplate for light of the remaining color channels, such that light of the remaining color channels passes through the PBP active element substantially unaffected. As such, the PBP structure is able to adjust incident light of the plurality of color channels uniformly in an apochromatic fashion.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: October 20, 2020
    Assignee: Facebook Technologies, LLC
    Inventors: Lu Lu, Wai Sze Tiffany Lam, Scott Charles McEldowney, Pasi Saarikko
  • Patent number: 10546203
    Abstract: A display device includes a first display unit emitting an output light having an output spectrum corresponding to a highest gray level of the display device, wherein an intensity integral of the output spectrum from 494 nm to 575 nm is defined as a first intensity integral, an intensity integral of the output spectrum from 380 nm to 493 nm is defined as a second intensity integral, an intensity integral of the output spectrum from 576 nm to 780 nm is defined as a third intensity integral, a summation of the second intensity integral and third intensity integral is defined as a first summation, a ratio of the first summation to the first intensity integral is defined as a first ratio, and the first ratio is greater than 0.0% and less than or equal to 37.0%.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: January 28, 2020
    Assignee: InnoLux Corporation
    Inventors: Hsiao-Lang Lin, Tsung-Han Tsai
  • Patent number: 9658507
    Abstract: A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. The liquid crystal layer includes liquid crystal molecules having a negative dielectric anisotropy, a response speed of about 4.0 ms or less, and a rotational viscosity of about 47 mPa·S to about 75 mPa·S.
    Type: Grant
    Filed: October 21, 2014
    Date of Patent: May 23, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Soon Joon Rho, Kyungmin Kim, Jin-Lak Kim, Hyelim Jang
  • Patent number: 9520091
    Abstract: A liquid crystal (LC) cell and the liquid crystal display with the same are disclosed. The LC cell includes a first LC cell and a second LC cell arranged opposite to the first LC cell, wherein the first LC cell is a normally white cell, and the second LC cell is a normally black cell. A display brightness of the second LC cell is white when the display brightness of the first LC cell transforms from white to black. The display brightness of the first LC cell is white when the display brightness of the second LC cell transforms from black to white. By mixing the normally white cell and the normally black cell, the response time is enhanced. In addition, the tracking or blurring effects occurring for the moving objects are efficiently eliminated.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: December 13, 2016
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventor: Jhen-wei He
  • Patent number: 8867013
    Abstract: System and method to detect video quality degradation in a video stream received by a telecommunications endpoint, the method including: locating reference features characteristic of content in the received video stream; calculating reduced reference features from the located reference features; receiving reduced reference features of a transmitted video stream, the transmitted video stream corresponding to the received video stream; calculating a distance between the reduced reference features in the received video stream and the reduced reference features of the transmitted video stream; and detecting video quality degradation when the calculated distance exceeds a predetermined threshold.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: October 21, 2014
    Assignee: Avaya Inc.
    Inventors: Anjur S. Krishnakumar, Bengi Karacali-Akyamac
  • Patent number: 8659736
    Abstract: A dual mode LCD device includes first and second substrates facing each other; a first electrode on an inner surface of the first substrate and having a plate shape; a first insulating layer on the first electrode; a second electrode and a third electrode on the first insulating layer, being spaced apart from each other and extending along a first direction; a fourth electrode on an inner surface of the second substrate; and a liquid crystal layer interposed between the first and second substrates and including chiral dopants, wherein liquid crystal molecules of the liquid crystal layer are stably arranged in a first twist state and a second twist state, wherein the first and second twist states are used for a memory mode and the second twist state and a vertical alignment state are used for a dynamic mode.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: February 25, 2014
    Assignee: LG Display Co., Ltd.
    Inventors: Joong-Ha Lee, Wook-Sung Kim, Dong-Guk Kim
  • Patent number: 8279395
    Abstract: A super-twist nematic (STN) liquid crystal (LC) light shutter with improved contrast performance, lower power requirements and enhanced off-axis performance. Compensator components may be disposed in front of and, in some cases, behind the liquid crystal cell. In some embodiments, a STN LC cell with a twist angle of 270 degrees may be used. In other embodiments, a STN LC cell with a twist angle ranging between just greater than 270 degrees and 285 degrees may be used. Also disclosed is a system incorporating the various disclosed STN LC shutters.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: October 2, 2012
    Assignee: RealD Inc.
    Inventor: Jianmin Chen
  • Patent number: 8203680
    Abstract: A liquid crystal display includes a first alignment film having a first alignment direction, a second alignment film having a second alignment direction, and a liquid crystal layer having liquid crystal molecules between the first and second alignment films. The liquid crystal layer is doped with a chiral material that tends to induce a first twist in directors of the liquid crystal molecules when an electric field is applied to the liquid crystal layer. The first and second alignment films have orientations that tends to induce a second twist in the directors when an electric field is applied to the liquid crystal layer, in which the direction of the first twist is different from the direction of the second twist.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: June 19, 2012
    Assignee: Chimei Innolux Corporation
    Inventors: Ju-Hyun Lee, Shin-Tson Wu, Wang-Yang Li, Chung-Kuang Wei
  • Patent number: 8045115
    Abstract: A liquid crystal display includes a first alignment film having a first alignment direction, a second alignment film having a second alignment direction, and a liquid crystal layer having liquid crystal molecules between the first and second alignment films. The liquid crystal layer is doped with a chiral material that tends to induce a first twist in directors of the liquid crystal molecules when an electric field is applied to the liquid crystal layer. The first and second alignment films have orientations that tends to induce a second twist in the directors when an electric field is applied to the liquid crystal layer, in which the direction of the first twist is different from the direction of the second twist.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: October 25, 2011
    Assignees: Chimei Innolux Corporation, University of Central Florida Research Foundation, Inc,
    Inventors: Ju-Hyun Lee, Shin-Tson Wu, Wang-Yang Li, Chung-Kuang Wei
  • Patent number: 8023094
    Abstract: An STN liquid crystal display, wherein a twist angle of liquid crystal molecules of the liquid crystal layer is 155° to 210°, and a first angle between a polarizing axis direction of the first polarizer and an alignment direction of liquid crystal molecules of the liquid crystal layer in contact with the first transparent substrate and a second angle between a polarizing axis direction of the second polarizer and an alignment direction of liquid crystal molecules of the liquid crystal layer in contact with the second transparent substrate are each larger than 0° and smaller than 90°, and a sum of the first and second angles is 90°±7°. The STN liquid crystal display is provided having a high contrast ratio and good characteristics of viewing angle.
    Type: Grant
    Filed: July 3, 2008
    Date of Patent: September 20, 2011
    Assignee: Stanley Electric Co., Ltd.
    Inventor: Takashi Sugiyama
  • Patent number: 7884888
    Abstract: A protective automatic darkening filter construction 10 includes two low twist liquid crystal cells 26, 30 interspersed between a series of offset polarizers 24, 28, 32. The resulting construction provides improved homogeneity in the dark state as viewed by the user over a large viewing angle. By reducing variations in shade, visibility through the filter may be improved.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: February 8, 2011
    Assignee: 3M Innovative Properties Company
    Inventors: Kristina M. Magnusson, Kenneth Jarefors, Per-Olav Dahlin
  • Patent number: 7864276
    Abstract: A liquid crystal display has (i) first and second substrates having electrodes and a pretilt angle of 88.5° to 89.5°, (ii) a liquid crystal layer, having a thickness d and made of liquid crystal molecule material which has a twist structure at a twist angle of 160° to 240° in a voltage application state, the liquid crystal layer containing chiral material having a pitch of p, where d/p is 0.2 to 0.74, (iii) a first polarizer disposed facing the first substrate, the first polarizer having as a transmission axis direction a first direction, (iv) a second polarizer disposed facing the second substrate, the second polarizer having as a transmission axis direction a second direction having an angle of 85° to 95° relative to the first direction, and (v) an optical anisotropic plate disposed at least one of between the first substrate and first polarizer and between the second substrate and second polarizer.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: January 4, 2011
    Assignee: Stanley Electric Co., Ltd.
    Inventor: Yoshihisa Iwamoto
  • Publication number: 20100265452
    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: Application
    Filed: June 30, 2010
    Publication date: October 21, 2010
    Applicant: Casio Computer Co., Ltd.
    Inventors: Hiroki Sato, Kunpei Kobayashi, Mamoru Yoshida
  • 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: 7738070
    Abstract: A liquid crystal display element of the present invention is arranged so that a material layer having dielectric anisotropy includes a chiral material and a liquid crystal material with a nematic liquid crystal phase, and 0.25?d/p?0.50 is satisfied assuming that the thickness of the material layer is d and the chiral pitch length of the liquid crystal material is p.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: June 15, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takashi Kurihara, Yasuhiro Kume, Kazuhiko Tamai, Takaaki Okamoto, Shinya Saeki
  • Patent number: 7667814
    Abstract: An STN liquid crystal display cell includes a liquid crystal layer sandwiched between a first and second transparent substrate, is outwardly provided with a first and second polarizers, and a monochromatic back light. Twist angle of the liquid crystal layer is 95° to 170° or 200° to 280°; a first angle between alignment direction of liquid crystal molecules contacting the first transparent substrate and polarization direction of the first polarizer and a second angle between an alignment direction of liquid crystal molecules contacting the second transparent substrate and polarization direction of the second polarizer are each larger than 0° and smaller than 90°; and sum of the first and second angles is 90°±7°.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: February 23, 2010
    Assignee: Stanley Electric Co., Ltd.
    Inventor: Takashi Sugiyama
  • Patent number: 7643124
    Abstract: A liquid crystal is provided, which can be used in a liquid crystal display (LCD) to provide an LCD exhibiting a good transmittance. The liquid crystal according to the invention has the following properties: (i) a dielectric anisotropy (??) ranging from about ?2.5 to about ?5; (ii) a splay elastic constant (K11) ranging from about 1.1×10?11 N to about 1.6×10?11 N; (iii) a bend elastic constant (K33) ranging from about 1.1×10?11 N to about 1.6×10?11 N; and (iv) ??, K11 (N) and K33 (N) conforming to the following equation: K 11 + K 33 ? 10 × ? ? ? ? ? < 1.28 × 10 - 12 . A liquid crystal material combination is also provided which comprises the liquid crystal according to the invention above mentioned and a polymerizable monomer.
    Type: Grant
    Filed: January 23, 2008
    Date of Patent: January 5, 2010
    Assignee: AU Optronics Corp.
    Inventors: Chia-Hsuan Pai, Chao-Yuan Chen, Te-Sheng Chen, Jenn-Jia Su
  • 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: 7589816
    Abstract: A device nematic liquid crystal display device has two stable states corresponding to two liquid crystal molecule textures whose torsion differs by 150° to 180° in terms of absolute value. The device includes two polarizers (10, 40), one (10) of which is placed on the observer side, the other (40) being placed on the opposite side of the liquid crystal cell. The orientation of the two polarizers is offset by a value which is equal to the rotatory power of the cell+/??/2, the rotatory power corresponding to the most twisted texture effect.
    Type: Grant
    Filed: November 25, 2004
    Date of Patent: September 15, 2009
    Assignee: Nemoptic
    Inventors: Cecile Joubert, Daniel Stoenescu, Alexandre Carton, Patrice Davi
  • Publication number: 20090201457
    Abstract: The present invention relates to liquid-crystalline mixtures and to novel compounds therefor, and to the use thereof in nematic liquid-crystal displays having positive dielectric anisotropy, such as, for example, STN or IPS displays, which are characterised in that they comprise one or more compounds of the formula (I) in which R1, A1, A2, Z1, Z2, n are as defined in Claim (1).
    Type: Application
    Filed: March 21, 2007
    Publication date: August 13, 2009
    Inventors: Michael Junge, Ursula Patwal, Volker Reiffenrath
  • Patent number: 7557897
    Abstract: A liquid crystal display includes a first substrate having a first electrode and a first alignment film, a second substrate having a second electrode and a second alignment film, and a liquid crystal layer having liquid crystal molecules between the first and second substrates. The liquid crystal layer is doped with a chiral material that tends to induce a twist in directors of the liquid crystal molecules when an electric field is applied to the liquid crystal layer using the first and second electrodes. The first alignment film has a first alignment direction, the second alignment film has a second alignment direction, and the first and second alignment films have orientations that tend to induce a twist in the directors when an electric field is applied to the liquid crystal layer, in which the direction of twist induced by the first and second alignment films is different from the direction of twist induced by the chiral material.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: July 7, 2009
    Assignees: Chi Mei Optoelectronics Corporation, University of Central Florida Research Foundation, Inc.
    Inventors: Ju-Hyun Lee, Shin-Tson Wu, Wang-Yang Li, Chung-Kuang Wei
  • Publication number: 20090147199
    Abstract: In a liquid crystal display element of the present invention, the aligning capability for imparting pre-tilt angles to a liquid crystal material is imparted only to the surface of the alignment film of one of the substrates, the material layer having dielectric anisotropy includes a chiral material and a liquid crystal material with a nematic liquid crystal phase, 0.25?d/p?0.50 is satisfied assuming that the thickness of the material layer having the dielectric anisotropy is d and the chiral pitch length of the liquid crystal material is p, and 1000×d/p??n×d is satisfied assuming that the refractive index anisotropy of the liquid crystal material is ?n.
    Type: Application
    Filed: September 12, 2006
    Publication date: June 11, 2009
    Inventors: Yasuhiro Kume, Takashi Kurihara, Kazuhiko Tamai, Takaaki Okamoto, Shinya Saeki
  • Publication number: 20090033828
    Abstract: An STN liquid crystal display, wherein a twist angle of liquid crystal molecules of the liquid crystal layer is 155° to 210°, and a first angle between a polarizing axis direction of the first polarizer and an alignment direction of liquid crystal molecules of the liquid crystal layer in contact with the first transparent substrate and a second angle between a polarizing axis direction of the second polarizer and an alignment direction of liquid crystal molecules of the liquid crystal layer in contact with the second transparent substrate are each larger than 0° and smaller than 90°, and a sum of the first and second angles is 90°±7°. The STN liquid crystal display is provided having a high contrast ratio and good characteristics of viewing angle.
    Type: Application
    Filed: July 3, 2008
    Publication date: February 5, 2009
    Applicant: Stanley Electric Co., Ltd.
    Inventor: Takashi SUGIYAMA
  • Patent number: 7477330
    Abstract: A protective automatic darkening filter construction 10 includes two low twist liquid crystal cells 26, 30 interspersed between a series of offset polarizers 24, 28, 32. The resulting construction provides improved homogeneity in the dark state as viewed by the user over a large viewing angle. By reducing variations in shade, visibility through the filter may be improved.
    Type: Grant
    Filed: March 9, 2005
    Date of Patent: January 13, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Kristina M. Magnusson, Kenneth Jarefors, Per-Olav Dahlin
  • Publication number: 20080304001
    Abstract: An STN liquid crystal display cell includes a liquid crystal layer sandwiched between a first and second transparent substrate, is outwardly provided with a first and second polarizers, and a monochromatic back light. Twist angle of the liquid crystal layer is 95° to 170° or 200° to 280°; a first angle between alignment direction of liquid crystal molecules contacting the first transparent substrate and polarization direction of the first polarizer and a second angle between an alignment direction of liquid crystal molecules contacting the second transparent substrate and polarization direction of the second polarizer are each larger than 0° and smaller than 90°; and sum of the first and second angles is 90°±7°.
    Type: Application
    Filed: May 27, 2008
    Publication date: December 11, 2008
    Applicant: Stanley Electric Co., Ltd.
    Inventor: Takashi SUGIYAMA
  • Patent number: 7405787
    Abstract: A liquid crystal display is provided which comprises a front panel comprising a front alignment layer having an alignment direction, a rear panel comprising a rear alignment layer having an alignment direction, and a liquid crystal layer between the front and rear alignment layers. The liquid crystal layer has a rotational twist angle of about 90° and a pre-tilt angle of not more then 2°. The alignment, material and thickness of the liquid crystal layer are such that at the mid-point of the rotational twist, the direction of liquid crystal directors coincide with an off-normal viewing direction of the liquid crystal display.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: July 29, 2008
    Assignee: Nitto Denko Corporation
    Inventors: Michael V. Paukshto, Louis D. Silverstein
  • 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: 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: 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: 7142280
    Abstract: A chiral structure having an advantageous extended chiral defect that provides an enhanced energy distribution characteristic therein. This is accomplished by configuring a central portion of the chiral structure with a pitch different from the rest of the structure. This may be envisioned as a distributed chiral twist with a predefined angle over a portion of a chiral structure. With the distributed defect, the photonic stop band remains wide, allowing for the substantial increase in the lifetime of the mode in which lasing occurs, while the extent of the high intensity region of the mode is large. The extended chiral defect structure may also be implemented as a thin-film chiral structure, for example using cholesteric liquid crystal or sculptured thin films.
    Type: Grant
    Filed: March 14, 2003
    Date of Patent: November 28, 2006
    Assignee: Chiral Photonics
    Inventors: Victor Il'ich Kopp, Azriel Zelig Genack
  • 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: 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: 7019811
    Abstract: The liquid-crystal switching or display device comprises a chiral smectic liquid-crystal mixture, where the ratio ?/? of the angle between the rubbing direction and the smectic layer normal to the tilt angle in the liquid-crystal mixture is at least 0.41. Preferably, the liquid-crystal mixture has the phase sequence I-N-C and the tilt angle ? at 25° C. is between 19° and 39°.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: March 28, 2006
    Assignee: Clariant International, Ltd.
    Inventors: Hans-Rolf Dübal, Barbara Hornung, Toshiaki Nonaka
  • Patent number: 7015996
    Abstract: In a semi-transmissive liquid crystal display device, the thickness of liquid crystal layer in the reflective region can be adjusted by controlling the film thickness of the organic insulating film for reflection and the film thickness of the color layer for reflection. Furthermore, the thickness of liquid crystal layer in the transmissive region can be adjusted by controlling the film thickness of the organic insulating film for transmission and the film thickness of the color layer for transmission. Since the thicknesses of liquid crystal layer in the reflective region and that in the transmissive region can be adjusted, the reflectance in the reflective region and the transmittance in the transmissive region can each be set at the most appropriate values.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: March 21, 2006
    Assignees: NEC Corporation, NEC LCD Technologies, Inc.
    Inventors: Michiaki Sakamoto, Osamu Sukegawa, Hidenori Ikeno
  • Patent number: 6999144
    Abstract: A transflective liquid crystal device capable of balancing a color difference between a reflective region and a transmissive region. The arrangement conditions of optical elements in the transflective LCD are as follows. The twist angle of the liquid crystal is about 40°˜80°. The angles ?up, ?down, ?up and ?down are about ?20°˜?60°, ?20°˜20°, 60°˜110°, ?30°˜20° respectively. The angle between the retardation axes of the upper ?/2 plate and the upper ?/4 plate is about 30°˜100°, and the angle between the retardation axes of the lower ?/2 plate and the lower ?/4 plate is about 30°˜80°.
    Type: Grant
    Filed: March 11, 2004
    Date of Patent: February 14, 2006
    Assignee: AU Optronics Corporation
    Inventors: Yang-En Wu, Po-Lun Chen
  • Patent number: 6953611
    Abstract: An anisotropic polymer film comprising a polymeriZed chiral liquid crystal material with helically twisted structure and having areas with different helical twist sense is useful for decorative or security applications.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: October 11, 2005
    Assignee: Merck Patent GmbH
    Inventors: Robert Hammond-Smith, John Patrick, Alison Linda May
  • Patent number: 6939478
    Abstract: A A compound having formula (2) wherein A2 is an electron acceptor moiety; C2 is a conjugated bridging moiety; D2 is an electron donor moiety; S2 is a hydrocarbon, a heterocyclic moiety, or a hetero-acyclic moiety; a? is an integer; Z2 is a polymerizable moiety; and e? is the degree of polymerization.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: September 6, 2005
    Assignee: Xerox Corporation
    Inventors: Gabriel Iftime, Peter M. Kazmaier, David Rider, Peter G. Odell
  • Patent number: 6900863
    Abstract: A liquid crystal display is furnished with: a liquid crystal display element having a pair of substrates, to which alignment members are provided to their respective opposing surfaces, and a liquid crystal layer sandwiched by the pair of substrates; an alignment mechanism for providing at least two different director configurations simultaneously on different arbitrary regions used for display in the liquid crystal layer; and a reflection film provided to at least one of the different arbitrary regions showing different director configurations; wherein the different arbitrary regions showing different director configurations are used for a reflection display section for showing reflection display and a transmission display section for showing transmission display, respectively.
    Type: Grant
    Filed: June 24, 2002
    Date of Patent: May 31, 2005
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masayuki Okamoto, Hajime Hiraki, Seiichi Mitsui
  • Patent number: 6858266
    Abstract: A device composed of: a liquid crystal composition including a liquid crystal and a liquid crystal domain stabilizing compound, wherein die liquid crystal composition is switchable between a strongly scattering state of a first plurality of smaller liquid crystal domains that strongly scatters a predetermined light and a weakly scattering state of a second plurality of larger liquid crystal domains that weakly scatters the predetermined light; and a liquid crystal containment structure defining a space for the liquid crystal composition.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: February 22, 2005
    Assignee: Xerox Corporation
    Inventors: Gabriel Iftime, Peter M. Kazmaier
  • Patent number: 6847425
    Abstract: A liquid crystal display includes a liquid crystal cell including a first transparent substrate and a second substrate, and a reflector attached to the outer surface of the first transparent substrate with a bonding layer therebetween. A first retarder is disposed on the outer surface of the second transparent substrate, a second retarder is disposed on the first retarder, and a polarizer is disposed on the second retarder. The reflector includes a resin substrate having an irregular surface and a metal reflection layer also having an irregular surface that corresponds to the irregular surface of the reflector. The reflector is attached to the liquid cell so that the metal reflector layer faces the first transparent substrate.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: January 25, 2005
    Assignee: Alps Electric Co., Ltd.
    Inventors: Tetsushi Tanada, Mitsuo Ohizumi, Mitsuru Kano
  • Patent number: 6822724
    Abstract: A liquid crystal display device of a vertical alignment mode is provided in which a quenching pattern, which is generated by such liquid crystal molecules whose in-plane component of the alignment directions under applied voltage is aligned along the cross nicole directions, is unrecognizable for a user. In the liquid crystal display device of a vertical alignment mode, a liquid crystal layer is has a defined value of d/p between 0.0021×(Vmax)2−0.0458×(Vmax)+0.65 and 0.0021×(Vmax)2−0.0458×(Vmax)+0.50, and a defined value of d·&Dgr;n/&lgr; between −0.00026×(Vmax)3+0.016×(Vmax)2−0.2281×(Vmax)+2.124 and −0.00026×(Vmax)3+0.016×(Vmax)2−0.2281××(Vmax)+1.7603, where Vmax [V] is the maximum applied effective voltage applied to the liquid crystal layer.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: November 23, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Ogishima, Masumi Kubo
  • Patent number: 6822709
    Abstract: A transflective display device has an upper substrate, a lower substrate and a liquid crystal layer interposed therebetween. A reflective electrode layer is formed overlying the inner surface of the lower substrate to serve as a reflective area of a pixel electrode. A transparent electrode layer is formed overlying the inner surface of the lower substrate, in which the transparent electrode layer not covered by the reflective electrode layer serves as a transmissive area of a pixel electrode. A first polarizer is formed overlying the outer surface of the upper substrate. A second polarizer is formed overlying the outer surface of the lower substrate. An optical compensation plate is formed between the second polarizer and the lower substrate.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: November 23, 2004
    Assignee: Toppoly Optoelectronics Corp.
    Inventors: Li-Sen Chuang, Wei-Chih Chang
  • Patent number: 6800338
    Abstract: To provide an electro-optical liquid-crystal displays with low addressing voltages and low to moderate multiplex ratios, in particular STN displays, organic alignment layers of low layer thickness are utilized.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: October 5, 2004
    Assignee: Merck Patentgesellschaft
    Inventors: Thomas Jacob, Juliane Suermann
  • Patent number: 6801283
    Abstract: A liquid crystal display device has an elliptic polarizer consisting of a polarizer, a first retarder, and a second retarder, and a reflector reflecting light in a visual light range. Optimal values for a twist angle of a liquid crystal layer, an angle between a transmission axis of the polarizer and a slow axis of the first retarder, an angle between the slow axis of the first retarder and a slow axis of the second retarder, and a product of birefringence &Dgr;n of liquid crystal material used in the liquid crystal layer and a thickness d of the liquid crystal layer are evaluated.
    Type: Grant
    Filed: May 2, 2003
    Date of Patent: October 5, 2004
    Assignees: Advanced Display Inc., Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hitoshi Koyama, Tetsuyuki Kurata, Tetsuya Satake, Takahiro Nishioka
  • Patent number: 6784955
    Abstract: The structure and construction of a bistable twisted nematic liquid crystal display with very long lifetime are disclosed. The two stable twist states in this display when no voltage is applied have almost infinite lifetimes and do not decay. These two stable twist states differ by a twist angle of 180°. New design conditions of this bistable twist structure are disclosed such that the contrast and the brightness are both optimized. This display can be operated in transmittive mode with two polarizes or in the reflective mode with one polarizer.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: August 31, 2004
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Jian-Xin Guo
  • Patent number: 6774977
    Abstract: A surface mode liquid crystal device, for example of the pi-cell type, comprises a layer nematic liquid crystal (10) disposed between alignment layers (4,9) and an electrode arrangement (3,8). The nematic liquid crystal has viscosity coefficients &eegr;1, &eegr;2 and &ggr;1, such that (&eegr;1-&eegr;2)/&ggr;1≧1.15 or (&eegr;1-&eegr;2)/&ggr;1≦0.9.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: August 10, 2004
    Assignee: Sharp Laboratories of Europe Limited
    Inventors: Harry Garth Walton, Michael John Towler