In Cholesteric Phase Patents (Class 349/185)
  • Patent number: 10245882
    Abstract: A method of making a housing comprises: providing a ceramic body; forming a pattern layer on a surface of the ceramic body to form an embedding member, wherein the pattern layer comprises at least one pattern, the pattern layer is made of thermo-sensitive ink material, and forming a base to integrated with the ceramic body formed with the least one pattern.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: April 2, 2019
    Assignees: SHENZHEN FUTAIHONG PRECISON INDUSTRY CO, FIH (HONG KONG) LIMITED
    Inventors: Yu-Tsai Wang, Ying-Bo Yang, Shui-Ying Chen, Bi-Ling Dong
  • Patent number: 9757923
    Abstract: A display device may include a display panel, a first adhesive layer attached on one surface of the display panel, a polymer layer attached on the display panel via the first adhesive layer, a second adhesive layer attached on a surface other than a surface of the first adhesive layer which has been attached on the one surface of the display panel, and a heat sink layer attached on the polymer layer via the second adhesive layer, wherein the at least one of the first adhesive layer, the polymer layer, and the second adhesive layer includes a color changing ink.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: September 12, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Dong Myung Shin, Seong Geun Won, Young Ji Kim, Hyo Young Mun
  • Patent number: 9377651
    Abstract: Embodiments of the invention comprise a cholesteric liquid display and a method for preparing the same. The cholesteric liquid display comprises a first substrate; an electrode substrate opposite to the first substrate; and a cholesteric liquid crystal layer between the first substrate and the electrode substrate, wherein the cholesteric liquid crystal layer comprises at least one layer of cholesteric liquid crystal, and the same layer of cholesteric liquid crystal has different pitches in different regions so as to be capable of reflecting light of different colors, respectively.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: June 28, 2016
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Xin Gu, Jaegeon You
  • Patent number: 8994911
    Abstract: The invention relates to an optical memory device and method for the preparation of the optical memory device based on glycerol, a very common and versatile solvent, mixed deformed helix ferroelectric liquid crystal (DHFLC) having applications in ferroelectric liquid crystal based devices, the said method comprising the steps of forming patterns of different shapes and configurations by lithographic methods to obtain an effective electrode area of at least 4.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: March 31, 2015
    Assignee: Council of Scientific & Industrial Research
    Inventors: Prakash Jai, Ajay Kumar, Amit Choudhary, Anu Malik, Indrani Coondoo, Ashok Manikrao Biradar
  • Patent number: 8964161
    Abstract: The present invention provides an electro-optical device comprising a cell of polymer-stabilized blue phase (PSBP) liquid crystal under an electrical field and a method of controlling the reflection and transmission of an incident electromagnetic radiation such as visible light, by way of controlling the electrical field. The invention exhibits merits such as cost-effectiveness; simpler manufacturability due to the removal of requirements of polarizer and color filter; and fast switching, among others.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: February 24, 2015
    Assignee: Kent State University
    Inventors: Liang-Chy Chien, Shin-Ying Lu
  • Patent number: 8947604
    Abstract: A cholesteric liquid crystal writing tablet includes a first substrate that is transparent and flexible on which a writing pressure is applied and a second substrate spaced apart from the first substrate. One electrically conductive layer is in contact with the first substrate and is transparent and another of the electrically conductive layers is in contact with the second substrate. The electrically conductive layers are separated from each other by a cell gap. Cholesteric liquid crystal material is disposed between the electrically conductive layers. Spacers are disposed in the liquid crystal material that control the cell gap. The spacers have a size and concentration in the liquid crystal material that restricts flow of the liquid crystal material when the cell gap is reduced upon application of the writing pressure.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: February 3, 2015
    Assignee: Kent Displays Incorporated
    Inventor: Oleg Pishnyak
  • Patent number: 8934077
    Abstract: There is provided a cholesteric liquid crystal display device including a first liquid crystal panel containing a first cholesteric liquid crystal substancecrystal material for reflecting a light of a first color, a second liquid crystal panel containing a second cholesteric liquid crystal substancecrystal material for reflecting a light of a second color, a third liquid crystal panel containing a third cholesteric liquid crystal substancecrystal material for reflecting a light of a third color, a light absorption layer combined to a lower portion of the third liquid crystal panel, a first double-sided adhesive buffer layer configured to combine the second liquid crystal panel to a lower portion of the first liquid crystal panel and a second double-sided adhesive buffer layer configured to combine the third liquid crystal panel to a lower portion of the second liquid crystal panel.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: January 13, 2015
    Assignee: Intellectual Discovery Co., Ltd.
    Inventors: Hyun Ha Hwang, Seung Gon Kang, Heon Kyu Kim
  • Patent number: 8908130
    Abstract: Optical elements and backlight modules employing the same are provided. The optical element can be a brightness enhancement diffusion complex film, comprising a cholesteric liquid crystal film and a transparent optical film directly disposed on the cholesteric liquid crystal film. Particularly, the whole transparent optical film directly contacts to the cholesteric liquid crystal film, in the absence of an intermediate located between the transparent optical film and the cholesteric liquid crystal film.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: December 9, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Ying-Jui Lin, Hui-Lung Kuo, Pin-Chen Chen, Pao-Ju Hsieh
  • Publication number: 20140307176
    Abstract: A light-transmitting pane for displaying an image of a head-up display is provided. The light-transmitting pane includes a cholesteric liquid-crystal layer arrangement, which is arranged in the interior of the pane or is arranged on a surface of the pane. Depending on the polarization of the incident light, at least a portion of the light generated by an image generating device of a head-up display arrangement can be reflected on the cholesteric liquid-crystal layer arrangement such that the reflected light has a p-polarized fraction, which can be perceived through polarized sunglasses.
    Type: Application
    Filed: April 11, 2014
    Publication date: October 16, 2014
    Inventors: Alexander NEUMANN, Louis COSTA
  • Patent number: 8817222
    Abstract: An optical element and a stereoscopic image display device are provided. The optical element is a light-dividing element, for example an element that can divide incident light into at least two kinds of light having different polarized states. Therefore, the optical element can be used to realize a stereoscopic image.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: August 26, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Eun Mi Seo, Sin Young Kim, Kyun Il Rah, Moon Soo Park, Seung Hun Chae
  • Publication number: 20140192286
    Abstract: A cholesteric liquid-crystal mixture containing a compound represented by the general formula (Ia), a compound represented by the general formula (Ib), a fluorine-containing horizontal alignment agent and a polymerization initiator is capable of forming a film which is prevented from precipitation of liquid-crystal compounds therein, of which the haze is reduced and which has a broad reflection width.
    Type: Application
    Filed: March 11, 2014
    Publication date: July 10, 2014
    Applicant: FUJIFILM CORPORATION
    Inventors: Tomoki TASAKA, Yasuhiro ISHIWATA, Minoru UEMURA, Takao TAGUCHI, Masao NAKAJIMA, Shunya KATOH
  • Patent number: 8704996
    Abstract: A cholesteric liquid crystal device is provided. The cholesteric liquid crystal device includes a first substrate, a second substrate disposed opposite to the first substrate, a first reflective layer disposed over the first substrate, a second reflective layer disposed over the second substrate, facing the first reflective layer, and a partition structure disposed between the first and the second substrates, wherein a cavity is formed by the partition structure, the first reflective layer and the second reflective layer, and a cholesteric liquid crystal layer is filled in the cavity.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: April 22, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Kuan-Ting Chen, Yi-Shou Tsai
  • Patent number: 8576345
    Abstract: A cholesteric liquid crystal display is provided, including a substrate, a first electrode layer disposed on the substrate, and a liquid crystal layer disposed on the first electrode layer, wherein the liquid crystal layer comprises at least two liquid crystals having different sensitivities to driving frequencies, mixed with each other, and liquid crystals having a greater initial state-transition temperature are more sensitive to driving frequency.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: November 5, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Kai-Wei Lan, Chao-Wen Chen, Wan-Wen Chiu
  • Patent number: 8558799
    Abstract: The invention relates to a user interaction device (200, 300) comprising an optical module (210, 310) having a layer (5) of a substance being electrically switchable between a first visual state and a second visual state, and an electrical switch (6a, 6b) for electrically switching the substance between the first and second visual states, a detector (6a, 11b) for detecting the presence of a physical object, and a control unit (290, 390) for controlling the electrical switch in response to the detection of presence of the physical object.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: October 15, 2013
    Assignee: Koninklijke Philips N.V.
    Inventors: Galileo June Destura, Armanda Cinderella Nieuwkerk, Johan Thomas Oostveen
  • Patent number: 8530007
    Abstract: A liquid crystal display includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes a first insulating substrate, in which a pixel area is defined, a gate line formed on the first insulating substrate, a data line crossing the gate line, and a thin film transistor connected to the gate line and the data line. The second substrate is opposite to the first substrate. The liquid crystal layer is interposed between the first and second substrates and includes a liquid crystal composition with a nematic-isotropic phase transition temperature (Tni) of 79° C. or above.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: September 10, 2013
    Assignee: Samsung Display Co., Ltd.
    Inventors: SooJeong Huh, Namseok Lee, Won-Gup Yoon, Soyoun Park, SiHeun Kim
  • Patent number: 8508448
    Abstract: This invention provides a method and apparatus for driving bistable cholesteric liquid crystal displays. The method and apparatus provided a display in which all the pixels are initially driven to the P state. Selected pixels for the display are then driven to the FC state to provide the desired message. The state of the pixels is then maintained for a viewing period prior to any resetting of the display to the P state. The switching from the P state to the FC state allows fast addressing times and lower voltages to be used in driving the display.
    Type: Grant
    Filed: November 7, 2005
    Date of Patent: August 13, 2013
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Fei-Hong Yu, Qing-Cheng Li, Wing-Chiu Yip
  • Patent number: 8508695
    Abstract: A polymer-dispersed liquid crystal system has a continuous polymer structure having defined therein a plurality of discrete bodies of liquid crystal material. The bodies of liquid crystal material exhibit a polydomain operating state in which the liquid crystal material within each body is arranged in multiple domains, each domain being defined by a quantity of liquid crystal material whose molecules have a substantially common identifiable alignment in at least one axis, wherein the resolved alignments of neighboring domains diverge substantially from one another and are stable over time.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: August 13, 2013
    Assignee: Vlyte Innovations, Ltd
    Inventor: Donal O'Keeffe
  • Patent number: 8377519
    Abstract: The instant invention relates to liquid crystal media comprising one or more bimesogenic compounds, one or more chiral dopants and one or more additives, liquid crystal displays comprising these media, in particular displays exploiting the flexoelectric effect and to a method of improving the response time of such displays.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: February 19, 2013
    Assignee: Merck Patent GmbH
    Inventors: Louise Diane Farrand, Harry James Coles, Mikhail N. Pivnenko, Yong-il Cho
  • Patent number: 8363203
    Abstract: A liquid crystal display includes a display section performing display using a liquid crystal, a substrate disposed to face a bottom surface of the display section and having a circuit for driving the liquid crystal mounted thereon, and a heat diffusing section disposed in contact with the bottom surface of the display section and a top surface of the substrate and having thermal conductivity higher than the thermal conductivity of air.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: January 29, 2013
    Assignee: Fujitsu Limited
    Inventors: Masaki Nose, Hisashi Yamaguchi
  • Patent number: 8330931
    Abstract: A device for controlling the polarization state of transmitted light comprises first and second cell walls enclosing a layer of a chiral liquid crystal material. The material has a uniformly orientated helical axis in the absence of an applied field, and electrodes for applying an electric field substantially normal to the helical axis. An applied electric field flexoelectrically couples to the molecules, causing distortion of the helical structure and hence changes the bulk birefringence of the cell.
    Type: Grant
    Filed: July 4, 2005
    Date of Patent: December 11, 2012
    Assignee: Cambridge Enterprise Limited
    Inventors: Harry J. Coles, Marcus J. Coles, Benjamin J. Broughton, Stephen M. Morris
  • Patent number: 8310631
    Abstract: In this disclosure, a blue colorant is added in the adhesion layer of a reflective polarizer to compensate the chromaticity difference caused by the reflective polarizer itself and large horizontal viewing angle. The chromaticity difference can be further reduced by adding beads in the adhesion layer and/or forming light-gathering microstructures on the outer surface of the quarter wave plate of the reflective polarizer.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: November 13, 2012
    Assignee: Eternal Chemical Co., Ltd.
    Inventors: Yu-Ming Sun, Chin-Yi Liao
  • Patent number: 8300187
    Abstract: A reflective liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer, a first alignment layer, and a second alignment layer. The first substrate and the second substrate are disposed oppositely to each other. The liquid crystal layer is disposed between the first substrate and the second substrate. The liquid crystal layer includes a plurality of liquid crystal molecules for reflecting light within a wavelength range and allowing light beyond the wavelength range to pass through. The second alignment layer is disposed on an inner side of the first substrate facing the second substrate, and the second alignment layer is employed to absorb the light passing through the liquid crystal layer and align the liquid crystal molecules.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: October 30, 2012
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Sheng-Fa Liu, Yu-Hsien Chen, Bao-Sian Ciou, Chun-Yu Shen, Huai-An Li
  • Patent number: 8293135
    Abstract: A PCLC flake/fluid host suspension that enables dual-frequency, reverse drive reorientation and relaxation of the PCLC flakes is composed of a fluid host that is a mixture of: 94 to 99.5 wt % of a non-aqueous fluid medium having a dielectric constant value ?, where 1<?<7, a conductivity value ?, where 10?9>?>10?7 Siemens per meter (S/m), and a resistivity r, where 107>r>1010 ohm-meters (?-m), and which is optically transparent in a selected wavelength range ??; 0.0025 to 0.25 wt % of an inorganic chloride salt; 0.0475 to 4.75 wt % water; and 0.25 to 2 wt % of an anionic surfactant; and 1 to 5 wt % of PCLC flakes suspended in the fluid host mixture. Various encapsulation forms and methods are disclosed including a Basic test cell, a Microwell, a Microcube, Direct encapsulation (I), Direct encapsulation (II), and Coacervation encapsulation. Applications to display devices are disclosed.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: October 23, 2012
    Assignee: University of Rochester
    Inventors: Gerald P. Cox, Cathy A. Fromen, Kenneth L. Marshall, Stephen D. Jacobs
  • Patent number: 8257800
    Abstract: A retardation film and formula thereof, and method for manufacturing the same are provided. Furthermore, the retardation film is applied to compensate TFT-LCD viewing angle. Referring to the formula of the invention, the positive A film-embedded negative C optically anisotropic coating of the retardation film can be formed by single step coating, and the retardation film with net negative C symmetry in whole is easily manufactured.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: September 4, 2012
    Assignee: Industrial Technology Research Institute
    Inventors: Ching-Mao Wu, Ming-Tzung Wu, Kuo-Tung Huang
  • 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: 8199086
    Abstract: The invention comprises a stacked color photodisplay apparatus using a photosensitive cholesteric liquid crystalline material on which an image can be optically addressed, retained without degradation for an indefinite period of time, electrically erased and a new image addressed. This is similar to a photographic film except that the photodisplay film can be used over and over again similar to digital display but without the cost of addressing electronics. Included is a device for enhancing the brightness of the image and electrooptical devices for optically writing digital images on the photodisplay. Each cell in the stack can be selectively addressed with a different optical image such as the red, green and blue components of a color digital image.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: June 12, 2012
    Assignee: Kent Displays Incorporated
    Inventors: J. William Doane, Asad A. Khan, Erica Montbach, Nithya Venkataraman
  • Patent number: 8189165
    Abstract: A liquid-crystalline coating fluid comprises: a lyotropic liquid crystal compound; a vinyl alcohol-based polymer; and a solvent, wherein 0.05 to 1.5 weight parts of vinyl alcohol-based polymer is contained with respect to 100 weight parts of the lyotropic liquid-crystal compound.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: May 29, 2012
    Assignee: Nitto Denko Corporation
    Inventors: Toru Umemoto, Toshimasa Nishimori, Tadayuki Kameyama
  • Publication number: 20120105793
    Abstract: A liquid crystal composition and a liquid crystal display employing the same are provided. The liquid crystal composition includes: 100 parts by weight of at least one nematic liquid crystal; 1-20 parts by weight of at least one photosensitive chiral compound; and 1-20 parts by weight of at least one non-photosensitive chiral compound.
    Type: Application
    Filed: April 28, 2011
    Publication date: May 3, 2012
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Hui-Fang TSENG, Chih-Lung CHIN, Wan-Chi CHEN, Chun-Ming WU, Kung-Lung CHENG, Shih-Hsien LIU
  • Publication number: 20120086902
    Abstract: An isosorbide derivative of Formula (I) is provided. In Formula (I), Z is —CH2—CH2—, —CH?CH—, —CH2—O—, —CH2—S—, —CH?N—O—, —CO—O—, —CO—S—, single bond, -ph-, —CO—O-ph- or —CO—O-ph-CO—O—, and ph represents benzene, R1 and R2 are, independently, C1-25 alkyl, —CN, —NCS, —CX3 or —OCX3, and X represents halogen, and m and n are, independently, 0, 1 or 2. The invention also provides a liquid crystal display including the isosorbide derivative.
    Type: Application
    Filed: December 15, 2010
    Publication date: April 12, 2012
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Chun-Ming Wu, Kevin Lin, Shih-Hsien Liu, Chih-Lung Chin, An-Cheng Chen, Kung-Lung Cheng, Chien-Hsien Cheng
  • Patent number: 8153208
    Abstract: A liquid crystal display includes: a first substrate, a second substrate facing the first substrate, a field generating electrode disposed on at least one of the first substrate and the second substrate and a liquid crystal layer interposed between the first substrate and the second substrate. The liquid crystal layer includes liquid crystal molecules and an alignment polymer. The alignment polymer is formed by light-irradiating the liquid crystal molecules and an alignment aid. The alignment aid includes a mesogen having halogen atoms and at least one photo-polymerizable group combined to the mesogen, and the alignment aid is electrically neutral or quasi-neutral.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: April 10, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jun-Hyup Lee, Jae-Jin Lyu
  • Patent number: 8139196
    Abstract: The invention relates to a liquid crystal display element, a method of manufacturing the element, and electronic paper having the element. The invention provides a liquid crystal element in which a change in a state of display attributable to an external force can be suppressed, a method of manufacturing the element, and electronic paper having the element. One blue pixel region is surrounded by four wall structures and four polymer layers without any discontinuity. The wall structures are formed on a bottom substrate and are in contact with a top substrate. The polymer layers are formed by injecting a cholesteric liquid crystal and polymeric substances (monomers or oligomers) which are materials different from both of the cholesteric liquid crystal and the wall structures between the top and bottom substrates and polymerizing the polymeric substances.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: March 20, 2012
    Assignee: Fujitsu Limited
    Inventor: Toshiaki Yoshihara
  • Publication number: 20120019738
    Abstract: A PCLC flake/fluid host suspension that enables dual-frequency, reverse drive reorientation and relaxation of the PCLC flakes is composed of a fluid host that is a mixture of: 94 to 99.5 wt % of a non-aqueous fluid medium having a dielectric constant value ?, where 1<?<7, a conductivity value ?, where 10?9>?>10?7 Siemens per meter (S/m), and a resistivity r, where 107>r>1010 ohm-meters (?-m), and which is optically transparent in a selected wavelength range ??; 0.0025 to 0.25 wt % of an inorganic chloride salt; 0.0475 to 4.75 wt % water; and 0.25 to 2 wt % of an anionic surfactant; and 1 to 5 wt % of PCLC flakes suspended in the fluid host mixture. Various encapsulation forms and methods are disclosed including a Basic test cell, a Microwell, a Microcube, Direct encapsulation (I), Direct encapsulation (II), and Coacervation encapsulation. Applications to display devices are disclosed.
    Type: Application
    Filed: July 21, 2010
    Publication date: January 26, 2012
    Applicant: UNIVERSITY OF ROCHESTER
    Inventors: Gerald P. Cox, Cathy A. Fromen, Kenneth L. Marshall, Stephen D. Jacobs
  • Patent number: 8102490
    Abstract: In order to provide a cholesteric liquid crystal display element of a structure capable of forming a color in the background by means of a low cost electrode structure and burying an Off display color completely in the background color, the color of the display part and background part of the display element is formed by a color reflection state and a transparent state. This configuration makes it possible to form a color in the background so as to bury the Off display color completely in the background by employing a low cost electrode structure, thereby improving a suitability to an industrial design and accomplish a display of a good visibility.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: January 24, 2012
    Assignee: Fujitsu Limited
    Inventor: Junji Tomita
  • Patent number: 8081272
    Abstract: In a preparation method, a chiral or cholesteric liquid crystal, a photoreactive monomer, and a photoinitiator are disposed in a liquid crystal cell. A principal surface of the liquid crystal cell is illuminated with ultraviolet light selected to have a non-uniform ultraviolet light intensity profile in the liquid crystal cell. The illuminating cooperates with the photoinitiator to polymerize at least a portion of the photoreactive monomer near the principal surface to generate a polymer network having a density corresponding to the non-uniform ultraviolet light intensity profile. The polymer network biases the liquid crystal toward a selected helical alignment direction. In some embodiments, the illuminating includes illuminating with first and second ultraviolet light intensity profiles to produce surface and volume polymer network components.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: December 20, 2011
    Assignees: Kent State University
    Inventors: Lachezar Komitov, Liang-Chy Chien, Sang Hwa Kim
  • 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: 8007876
    Abstract: A liquid crystal display (LCD) and a fabrication method thereof are provided. The LCD includes a first substrate and a second substrate opposite to the first substrate. At least two layers of cholesteric liquid crystal layers are disposed between the first and the second substrates, wherein chiral dopants with different optical activities are respectively added in the cholesteric liquid crystal layers, and the chiral dopants have the same chemical structure. The fabrication method includes providing a first substrate and a second substrate opposite to the first substrate. A plurality of chiral dopants with different optical activities and having the same chemical structure are mixed into the same liquid crystal host respectively to form at least two kinds of cholesteric liquid crystal materials. Then, the cholesteric liquid crystal materials are disposed between the first and the second substrates to form at least two layers of cholesteric liquid crystal layers.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: August 30, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Chun-Ming Wu, Shih-Hsien Liu, Chih-Lung Chin, Kung-Lung Cheng, An-Cheng Chen
  • Patent number: 7935394
    Abstract: Disclosed herein is a polar nematic liquid crystal assembly. The liquid crystal assembly comprises 5˜7.5% by weight of a dopant having the structure of Formula 1 below: (wherein X is an alkyl, alkenyl or heteroalkyl group having three or more carbon atoms) and 92.5˜95% by weight of smectic liquid crystal molecules having a linear alkyl chain wherein the N-bonding moiety of the dopant is spontaneously bonded to the alkyl chain of the smectic liquid crystal molecules to induce macroscopic spontaneous polarization in a particular direction.
    Type: Grant
    Filed: November 9, 2005
    Date of Patent: May 3, 2011
    Assignee: Korea University Industry and Academy Cooperation Foundation
    Inventors: Tong-Kun Lim, Ji-Hoon Lee
  • Patent number: 7931825
    Abstract: A polymerizable composition comprising a bifunctional (meth)acrylate compound represented by general formula (1) and a monofunctional (meth)acrylate compound having a nitrile group at the terminal thereof represented by general formula (2). The mass ratio of them (the former/the latter) is from 90/10 to 40/60.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: April 26, 2011
    Assignee: Adeka Corporation
    Inventors: Masatomi Irisawa, Ken Matsumoto
  • Patent number: 7922935
    Abstract: A liquid crystal display device being resistant to display unevenness without loss of responsivity and being capable of securing configurational stability is provided. A liquid crystal display device includes: a liquid crystal layer including liquid crystal molecules and a polymer compound including a structure represented by Chemical Formula 1; and a pair of substrates facing each other with the liquid crystal layer in between, where m and n each are an integer of 1 to 4 both inclusive.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: April 12, 2011
    Assignee: Sony Corporation
    Inventor: Shingo Kataoka
  • Patent number: 7922934
    Abstract: The invention relates 1,2,3,6,7,8-hexahydro-s-indacene derivatives and 6,7-dihydro-5H-indeno[5,6-d]-1,3-dioxole derivatives, and to the use thereof as component(s) in liquid-crystalline media. In addition, the present invention relates to liquid-crystal and electro-optical display elements which contain the liquid-crystalline media according to the invention.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: April 12, 2011
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Lars Lietzau, Detlef Pauluth, Markus Czanta
  • Patent number: 7920245
    Abstract: A light-modulating material includes a transparent front surface layer, an intermediate layer including a liquid crystal forming an isotropic phase and a transparent back surface layer, laminated in this order.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: April 5, 2011
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hiroaki Miura, Hidekazu Takahashi
  • Publication number: 20110058138
    Abstract: A liquid crystal display includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes a first insulating substrate, in which a pixel area is defined, a gate line formed on the first insulating substrate, a data line crossing the gate line, and a thin film transistor connected to the gate line and the data line. The second substrate is opposite to the first substrate. The liquid crystal layer is interposed between the first and second substrates and includes a liquid crystal composition with a nematic-isotropic phase transition temperature (Tni) of 79° C. or above.
    Type: Application
    Filed: May 12, 2010
    Publication date: March 10, 2011
    Inventors: SooJeong HUH, Namseok Lee, Won-Gup Yoon, Soyoun Park, SiHeun Kim
  • Patent number: 7887717
    Abstract: The present invention relates to a liquid-crystalline medium having high twist, to the use thereof for electro-optical purposes, and to displays containing this medium.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: February 15, 2011
    Assignee: Merck Patent Gesellschaft Mit Beschranker Haftung
    Inventors: Akihiro Kojima, Makoto Murakami, Fumio Shimano, Jeong-Hee Sung
  • Patent number: 7880837
    Abstract: A cholesteric display may be formed, in some embodiments, using a single display element to produce multi-colors for display. A cholesteric material may be sandwiched between a pair of substrates, each associated with pairs of opposed electrodes that are arranged in general transversely to the optical axis of incident light. The first pair of electrodes produce one of two liquid crystal states and result in the reflection of light of a particular wavelength. Light of other wavelengths may be reflected when a second pair (or set) of opposed electrodes, arranged in general transversely, also to the optical axis of incident light, are biased appropriately. So does a third pair (or set) of electrodes. A black and white color display may be generated from a single display element by modulating the pitch length of the cholesteric material within each pairs (or sets).
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: February 1, 2011
    Assignee: Intel Corporation
    Inventors: David B. Chung, Daniel J. Lenehan
  • 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: 7843530
    Abstract: A liquid crystal-containing composition includes a first cholesteric liquid crystal having a peak wavelength of selective reflection in the range of from 600 nm to 800 nm and encapsulated in a microcapsule and a second cholesteric liquid crystal having a peak wavelength of selective reflection in the range of from 400 nm to 500 nm as the only liquid crystals, and the content of the second cholesteric liquid crystal with respect to the entire cholesteric liquid crystal content is from about 5 weight % to about 40 weight %.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: November 30, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Naoki Hiji, Takeo Kakinuma, Chikara Manabe, Tadayoshi Ozaki
  • Publication number: 20100296038
    Abstract: The instant invention relates to liquid crystal media comprising one or more bimesogenic compounds, one or more chiral dopants and one or more additives, liquid crystal displays comprising these media, in particular displays exploiting the flexoelectric effect and to a method of improving the response time of such displays.
    Type: Application
    Filed: May 16, 2007
    Publication date: November 25, 2010
    Inventors: Louise Diane Farrand, Harry James Coles, Mikhail N. Rivnenko, Yong-il Cho
  • Patent number: 7808604
    Abstract: An in-plane switching mode liquid crystal display device includes upper and lower substrates, first and second ferroelectric liquid crystal layers, a nematic system crystal layer, and first and second electrodes. The electrodes and liquid crystal layers are located between the substrates, with the nematic liquid crystal layer between the ferroelectric liquid crystal layers. The ferroelectric liquid crystal layers have different spontaneous polarization directions. An electric field is applied to the liquid crystal layers using the electrodes. The ferroelectric liquid crystal layers react to different electric field to conduct an in-plane driving of liquid crystal molecules in the nematic liquid crystal layer.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: October 5, 2010
    Assignee: LG. Display Co., Ltd.
    Inventors: Su Seok Choi, Ku Hyun Park
  • Patent number: 7749575
    Abstract: The invention relates to a liquid crystal display utilizing a vertically aligned state of liquid crystal molecules when no voltage is applied and to a method of manufacturing the same. The invention is aimed at providing a liquid crystal display and a method of manufacturing the same in which the existing step for forming vertical alignment films can be omitted to achieve a cost reduction. The liquid crystal display includes a monofunctional monomer having a structure expressed by X-R (where X represents an acrylate group or a methacrylate group, and R represents an organic group having a steroid skeleton). A liquid crystal material is sandwiched between substrates which is then irradiated with ultraviolet rays to cure the monofunctional monomer, thereby forming a polymer film at an interface of a substrate. The monofunctional monomer has a hydrophobic skeleton such as an alkyl chain and a photoreactive group on one side of the skeleton.
    Type: Grant
    Filed: March 25, 2004
    Date of Patent: July 6, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shingo Kataoka, Hideaki Tsuda, Katsufumi Ohmuro, Jin Hirosawa, Seiji Tanuma, Yoshio Koike
  • Publication number: 20100149480
    Abstract: A display element according to the present invention is provided with a pair of substrates, at least one of which is transparent; a medium between the substrates, wherein optical anisotropy magnitude of the medium is changeable by and according to an electric field applied thereon; at least one pair of electrodes for applying, on the medium, the electric field substantially parallel to the substrates; and a shielding electrode overlapping at least a display portion of at least one of the substrates, and used for shielding the display element from static electricity.
    Type: Application
    Filed: January 26, 2010
    Publication date: June 17, 2010
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara, Akihito Jinda, Kiyoshi Ogishima