Polymer Network Liquid Crystal Patents (Class 349/88)
  • Patent number: 7175780
    Abstract: The process described herein offers the optimizing of performance parameters of holograms, such as reducing scattering effects in a polymer-dispersed liquid crystal optical element. In the process, an interfacial tension agent is added to a polymer-dispersed liquid crystal material. The polymer-dispersed liquid crystal material has at least one acrylic acid monomer, at least one type of liquid crystal material, a photoinitiator dye, and a co-initiator. The polymer-dispersed liquid crystal material is subjected to a polymerization. The interfacial tension agent reduces the size of liquid crystal droplets formed within the polymer-dispersed liquid crystal optical element during polymerization.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: February 13, 2007
    Assignee: Science Applications International Corporation
    Inventors: Richard L. Sutherland, Lalgudi V. Natarajan, Robert T. Pogue, Christina K. Shepherd, Donna M. Brandelik
  • Patent number: 7148937
    Abstract: The present invention relates to an electro-optical imaging layer, a display utilizing the imaging layer and a method for making the same comprising a binder having dispersed therein at least two electrically modulated material domains of different uniform sizes, wherein the ratio of smallest to largest domain size for each of the electrically modulated material domains of different uniform sizes varies by no more than 1:2.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: December 12, 2006
    Assignee: Eastman Kodak Company
    Inventors: Charles M. Rankin, Jr., Erica N. Montbach
  • Patent number: 7139061
    Abstract: In a liquid crystal display device, the pixel electrodes and the projection pattern are formed on the TFT substrate side, and surfaces of the pixel electrodes and the projection pattern are covered with a vertical alignment film. Opposing electrode and a projection pattern are formed on the CF substrate side, and surfaces of the opposing electrode and the projection pattern are covered with a vertical alignment film. The TFT substrate and the CF substrate are arranged such that top end portions of the projection pattern on the CF substrate are brought into contact with the TFT substrate. Liquid crystal having negative dielectric anisotropy is sealed between the TFT and CF substrates. Accordingly, the step of scattering the spacers can be omitted, change in the cell thickness can be prevented, and the good display quality can be achieved.
    Type: Grant
    Filed: November 6, 2003
    Date of Patent: November 21, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masahiro Ikeda, Manabu Sawasaki, Yoji Taniguchi, Hiroyasu Inoue, Tomonori Tanose, Yoshinori Tanaka
  • Patent number: 7133172
    Abstract: The invention relates to an optical element with variable optical properties, which ensures that the amount of light available is increased, and an optical device using the same. In a liquid crystal variable hologram element 3, polymer layers 18 and liquid crystal layers 19 are alternately arranged between transparent substrates 16 and 17, with liquid crystal particles 20 lining up in each liquid crystal layer 19. When voltages are applied on transparent electrodes 21 and 22, liquid crystal molecules 23 have their longitudinal directions oriented vertically with respect to the electrodes, so that the refractive index of the polymer layers 18 is substantially equal to that of the liquid crystal layers 19, resulting in no development of hologram. When the voltages are held off, the refractive index of the polymer layers 18 is different from that of the liquid crystal layers 19. This repetition gives rise to an interference fringe action, by which a hologram can be developed.
    Type: Grant
    Filed: December 14, 2004
    Date of Patent: November 7, 2006
    Assignee: Olympus Corporation
    Inventor: Kimihiko Nishioka
  • Patent number: 7125590
    Abstract: Liquid crystal films with excellent heat resistance and mechanical strength are provided.
    Type: Grant
    Filed: April 14, 2004
    Date of Patent: October 24, 2006
    Assignee: Nippon Oil Corporation
    Inventors: Takuya Matsumoto, Hitoshi Mazaki, Toru Nakamura, Takashi Seki
  • Patent number: 7123335
    Abstract: A display sheet is disclosed comprising, a substrate, first transparent conductors, second conductors and, between first and second conductors, at least one imaging layer comprising a substantial monolayer of isolated domains of liquid-crystal material, dispersed in a continuous matrix, wherein said domains of liquid-crystal material comprises a mixture of at least two populations, a first population comprising a first liquid-crystal material having a first ?max within the infrared spectral region and a second population comprising a second liquid-crystal material having a second ?max within the visible spectral region. Alternately, the imaging layer can comprise a substantial monolayer of isolated domains of liquid-crystal material comprising a population of domains comprising a liquid-crystal material having a ?max between 700 and 800 and having a half-peak width that extends into both the visible spectrum region and the infrared spectral region.
    Type: Grant
    Filed: May 25, 2004
    Date of Patent: October 17, 2006
    Assignee: Eastman Kodak Company
    Inventors: Krishnan Chari, Charles M. Rankin, Jr.
  • Patent number: 7119859
    Abstract: The present invention relates to a bistable polymer dispersed liquid crystal display comprising a support, at least one patterned first conductor layer having thereon at least one dried imaging layer comprising a substantial monolayer of isolated domains of liquid crystal material dispersed in a continuous polymer matrix, wherein said dried imaging layer further comprises at least one absorber colorant, and wherein said isolated domains have a size distribution such that the coefficient of variation (cv) is less than 0.35.
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: October 10, 2006
    Assignee: Eastman Kodak Cimpany
    Inventors: Krishnan Chari, Charles M. Rankin, Jr., Thomas R. Welter
  • Patent number: 7113241
    Abstract: The invention has an object to provide a liquid crystal display in which a wide angle of view is obtained and a response time at a halftone can be shortened by regulating an alignment orientation of a liquid crystal by the use of a polymer fixation system in which a liquid crystal layer containing a polymerizable component is sealed between substrates, and the polymerizable component is polymerized while a voltage is applied to the liquid crystal layer to fix a liquid crystal alignment. A liquid crystal layer containing a polymer for regulating a pretilt angle of a liquid crystal molecule and a tilt direction at a time of driving is sealed between two substrates arranged opposite to each other.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: September 26, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Kazutaka Hanaoka
  • Patent number: 7102706
    Abstract: Disclosed is a method for aligning polymer network liquid crystal. In the method, alignment of liquid crystal in a bulk state is controlled by means of an orientation power of polymer material itself which is formed by irradiating linearly polarized ultraviolet rays to monomer material having an orientation power, thereby achieving a transparent state at an initial state without an orientation layer. That is, Linearly polarized ultraviolet rays are irradiated to ultraviolet-hardening type monomers having an orientation power. Alignment of liquid crystal of a bulk state is controlled while the monomers are changed to polymers, thereby achieving an initial transparent state. The molecules of the liquid crystal are placed in disorder by a vertical electric field and the horizontal orientation power of a polymer chain.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: September 5, 2006
    Assignee: Boe Hydis Technology Co., Ltd.
    Inventors: Mi Sook Kim, Sung Hun Song, Seung Hee Lee
  • Patent number: 7090901
    Abstract: The present invention provides a method of preparation of optical compensation films using a polymer stabilization technique so as to enable continuous roll-to-roll production. The films can be applied for reflective liquid crystal displays. They are prepared by photo-polymerizing a mixture comprising a reactive monomer (or mixture of monomers), a small amount of photoinitiator and liquid crystal. The concentration of the reactive monomer (mesogenic or non-mesogenic) in the reactive mixtures can be as low as 5% or as high as 99% by weight. The materials that can function as the optical compensation films in the present invention include, but are not limited to, mixtures of liquid crystal and reactive mesogenic monomers (rod-like, bent-shaped, and disc-like mesogenic monomers) containing polymerizable groups (monofunctionaly or multifunctional) selected from acrylate, methacrylate, vinyls, butadiene, vinyl ethers, or epoxide.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: August 15, 2006
    Assignee: Kent State University
    Inventors: Liang-Chy Chien, Toru Doi
  • Patent number: 7079203
    Abstract: Inhomogeneous concentrated polymer network with approximately 90° twisted nematic liquid crystal (TN-LC) is used for fabricating lens and prisms. For forming a positive lens, the approximately 90° TN-LC polymer network concentration can gradually decrease from the center to the side edges. For forming a negative lens, the approximately 90° TN-LC polymer network concentration can gradually increase from the center to the side edges. The lens can be created by ultra violet (UV) light exposure to patterned photo masks. The lens can be tuned by applying voltage above the threshold voltage to the polymer network. The inhomogeneous 90° TN-LC polymer network can also be used in Fresnel lens and prisms. Applications of the invention can be used for micro lens, array, optical communication, micro-optics, adaptive optics and beam steering.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: July 18, 2006
    Assignee: Research Foundation of the University of Central Florida, Inc.
    Inventors: Yuhua Huang, Hongwen Ren, Xinyu Zhu, Shin-Tson Wu
  • Patent number: 7057680
    Abstract: A liquid crystal device showing performances, such as good viewing angle characteristic, high contrast, high-speed responsiveness, high resolution and high productivity is given by forming a layer of discotic liquid crystal placed in an edge-on and uniaxial alignment state. In the liquid crystal layer, the discotic liquid crystal may preferably assume a nematic discotic layer and co-present with a rod-shaped liquid crystal in mutually separated phases.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: June 6, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventor: Koichi Sato
  • Patent number: 7038743
    Abstract: An electro-optic device includes a liquid crystal cell (10, 10?) and at least one electrode (40, 42, 40?, 42?) arranged to selectively electrically bias the liquid crystal cell (10, 10?). A chiral or cholesteric liquid crystal (30, 30?) is disposed in the liquid crystal cell (10, 10?). The liquid crystal (10, 10?) has an optic axis substantially along a selected optic axis direction in the absence of an electrical bias. A polymeric network (32, 32?, 72) is disposed at an inside surface of the liquid crystal cell (10, 10?). The polymeric network (32, 32?, 72) extends partway into the liquid crystal cell (10, 10?) leaving at least a portion of the liquid crystal cell (10, 10?) substantially free of the polymeric network (32, 32?, 72).
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: May 2, 2006
    Assignees: Kent State University, Ecsibeo AB
    Inventors: Lachezar Komitov, Liang-Chy Chien, Sang Hwa Kim
  • Patent number: 7023600
    Abstract: The present invention is directed to an electrically switchable laminate construction for applications including smart windows, and other uses and applications in which light management is desired. The electro-optical laminate construction has scattering and transparent modes of operation for dynamically controlling electromagnetic radiation flow.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: April 4, 2006
    Assignee: Avery Dennison Corporation
    Inventors: Prakash Mallya, Yi-Hung Chiao, David N. Edwards, Kal Li, Xin-Jiu Wang, Sriram Venkatasanthanam, Nagarajan Srivatsan, Pradeep Iyer
  • Patent number: 7009665
    Abstract: Electro-optical glazing structures having total-scattering and total-transparent modes of operation which are electrically-switchable for use in dynamically controlling electromagnetic radiation flow in diverse applications.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: March 7, 2006
    Inventors: Le Li, Jian-Feng Li, Sadeg M. Faris
  • Patent number: 7008675
    Abstract: An electro-optically active polymer gel material comprising a high molecular weight alignment polymer adapted to be homogeneously dispersed throughout a liquid crystal to control the alignment of the liquid crystal molecules and/or confer mechanical stability is provided. The electro-optically active polymer gel comprises a homogenous gel in which the polymer strands of the gel are provided in low concentration and are well solvated by the small molecule liquid crystal without producing unacceptable slowing of its electrooptic response. During formation of the gel, a desired orientation is locked into the gel by physical or chemical cross-linking of the polymer chains. The electro-optically active polymer is then utilized to direct the orientation in the liquid crystal gel in the “field off” state of a liquid crystal display.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: March 7, 2006
    Assignee: California Institute of Techology
    Inventors: Julia A. Kornfield, Michael D. Kempe
  • Patent number: 7009666
    Abstract: A reflective cholesteric display that may be viewed under a wide range of ambient lighting conditions, ranging from complete darkness to bright sunlight. The display includes a chiral nematic liquid crystal material located between first and second substrates, an ambidextrous or bi-directional circular polarizer, a partial mirror, also referred to as a transflector, and a light source. The liquid crystal material includes focal conic and planar textures that are stable in the absence of an electric field. The ambidextrous circular polarizer is located adjacent to one of the substrates that constrain the liquid crystal material. The chiral nematic liquid crystal display may be operated in both a transmissive mode and a reflective mode.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: March 7, 2006
    Assignee: Kent Displays Incorporated
    Inventors: Asad A. Khan, Michael E. Stefanov, Clive Catchpole
  • Patent number: 6982019
    Abstract: The present invention concerns a method for manufacturing a plurality of multi-layered cells, particularly liquid crystal display cells, or electrochemical photovoltaic cells, or a combination of such cells, each cell including at least two superposed sealed cavities each delimited by a sealing frame and filled with a liquid, this method comprising the step of collectively manufacturing a batch of cells including at least three plates common to all the display cells and connected to each other by patterns of sealing material connecting said plates to each other and forming the sealing frames which delimit the cavities of said cells, this method being characterised in that filling holes are pierced through the plates such that each of the cavities of a cell is fed by a different filling hole, each of the filling holes being in communication with at least two cells and feeding the cavities of the same level, i.e.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: January 3, 2006
    Assignee: Asulab S.A.
    Inventors: Gilles Rey-Mermet, Rolf Klappert, Nicolas Blanckaert
  • Patent number: 6965420
    Abstract: A light controlling film is disclosed, comprising a polymerized polymer network varying spatially in a direction normal to the film surface, where the polymerized polymer network is a crosslinked high molecular weight polymeric material mixed with a low molecular weight nematic material exhibiting cholesteric liquid crystal (CLC) order, wherein an electric field impressed in the film controls the reflection bandwidth of circularly polarized light.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: November 15, 2005
    Assignee: Reveo, Inc.
    Inventors: Le Li, Bunsen Fan, Yingqiu Jiang, Sadeg M. Faris, Jian-Feng Li, Sameer Vartak
  • Patent number: 6963435
    Abstract: The present invention is directed to an electrically switchable laminate construction for applications including smart windows, and other uses and applications in which light management is desired. The electro-optical laminate construction has scattering and transparent modes of operation for dynamically controlling electromagnetic radiation flow.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: November 8, 2005
    Assignee: Avery Dennison Corporation
    Inventors: Prakash Mallya, Yi-Hung Chiao, David N. Edwards, Kai Li, Xin-Jiu Wang, Sriram Venkatasanthanam
  • Patent number: 6937383
    Abstract: A large screen emissive display operating at atmospheric pressure includes pixels, the red, green, and blue subpixels of which are excited by UV laser light scanned onto the subpixels by a pixel activation mechanism. The pixel activation mechanism includes three grating light valves (GLVs) that are controlled by a processor in response to a demanded image to modulate the UV light as appropriate to produce the demanded image.
    Type: Grant
    Filed: January 27, 2004
    Date of Patent: August 30, 2005
    Assignees: Sony Corporation, Sony Electronics Inc.
    Inventors: Joe Morikawa, Ben Russ
  • Patent number: 6924870
    Abstract: A liquid crystal diffractive light valve includes: a pair of opposed substrates wherein one of the substrates is a silicon wafer with associated electronics. The other substrate has an electrode layer facing the silicon substrate. And a ultraviolet curable composite material is disposed between the substrates which is then phase separated to form polymer walls having liquid crystal directors fixed therein regardless of application of an electric field across the electrode layers, and wherein pixel regions are formed between the polymer walls. The pixel regions have liquid crystal directors which are movable when an electric field is applied across the electrode layers. Application of an electric field allows for generation of phase differences between the wall and pixel regions to allow for Liquid Crystal on Silicon devices to be used as diffractive light valves.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: August 2, 2005
    Assignee: Kent State University
    Inventors: Bin Wang, Philip Bos, David B. Chung
  • Patent number: 6897937
    Abstract: A liquid crystal display cell, and a fabricating method thereof, that incorporates a light-cured monomer in a ferroelectric liquid crystal. By injecting the light-cured monomer/ferroelectric liquid crystal between substrate while in a nematic phase or isotropic phase, by performing DC voltage treatments as the liquid crystal temperature decreases, and by performing a light irradiation treatment, a stable, aligned ferroelectric liquid crystal cell is produced. Such a ferroelectric liquid crystal cell can reduce flicker and can be realigned after a physical shock.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: May 24, 2005
    Assignee: LG.Philips LCD Co., Ltd.
    Inventor: Su Seok Choi
  • Patent number: 6897915
    Abstract: A liquid crystal device comprises a first and second cell wall structure; at least one liquid crystal material disposed within a space between the first and second cell wall structures; and polymer micro-structures, wherein the micro-structures are formed by polymerizing a prepolymer, and wherein said micro-structures have a shape and spatial location determined by said liquid crystal material. Permanent polymer micro-structures are formed from a liquid crystal with a non-uniform spatially modulated director field. The polymer structures have the shape and spatial location dictated by the non-uniform director field of the liquid crystal. The micro-structures are a backbone that restores the liquid crystal director field that existed during the polymerization process even when other factors, such as electric field, temperature, or surface anchoring, do not favor this restoration.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: May 24, 2005
    Assignee: Kent State University
    Inventors: Oleg D. Lavrentovich, Dmitry Voloschenko, Sergij Shiyanovskii
  • Patent number: 6878494
    Abstract: A new photopolymerizable material allows single-step, fast recording of volume holograms with properties that can be electrically controlled. Polymer-dispersed liquid crystals (PDLCs) in accordance with the invention preferably comprise a homogeneous mixture of a nematic liquid crystal and a multifunctional pentaacrylate monomer, in combination with photoinitiator, coinitiator and cross-linking agent. Optionally, a surfactant such as octanoic acid may also be added. The PDLC material is exposed to coherent light to produce an interference pattern inside the material. Photopolymerization of the new PDLC material produces a hologram of clearly separated liquid crystal domains and cured polymer domains. Volume transmission gratings made with the new PDLC material can be electrically switched between nearly 100% diffraction efficiency and nearly 0% diffraction efficiency. By increasing the frequency of the switching voltage, switching voltages in the range of 50 Vrms can be achieved.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: April 12, 2005
    Assignee: Science Applications International Corporation
    Inventors: Richard L. Sutehrland, Lalquidi V. Natarajan, Vince P. Tondiglia, Timothy J. Bunning
  • Patent number: 6876411
    Abstract: A method of manufacturing a liquid crystal display device is disclosed. The method comprises filling the space between two facing substrates with a mixture of pre-polymer and liquid crystal material, applying an external source of energy to initiate a polymerization, wherein as the polymerization proceeds a phase separation of the polymer and liquid crystal is generally also proceeding, after initiation of polymerization and before completion thereof, adjusting a parameter that affects one or both of the rates of polymerization and phase separation, so as to produce a variation in the polymerized structure, wherein the variation is a result of the rates of polymerization and phase separation being adjusted during the course of polymerization.
    Type: Grant
    Filed: July 15, 2003
    Date of Patent: April 5, 2005
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Gary A. Freeman
  • Patent number: 6873381
    Abstract: A light controlling film is described comprising a polymerized polymer network of a crosslinked high molecular weight polymeric material and a low molecular weight cholesteric liquid crystal (CLC) material, wherein the high molecular weight and the low molecular weight form a material having cholesteric liquid crystal (CLC) order such that the film is a reflective circular polarizer whose bandwidth is controllable by an electric field impressed in the film.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: March 29, 2005
    Assignee: Reveo, Inc.
    Inventors: Bunsen Fan, Jian-feng Li, Le Li, Sadeg Faris
  • Patent number: 6864875
    Abstract: A full color, reflective display having superior saturation and brightness is achieved with a novel display element comprising multichromatic elements. In one embodiment a capsule includes more than three species of particles which differ visually. One embodiment of the display employs three sub-pixels, each sub-pixel comprising a capsule including three species of particles which differ visually. Another embodiment of the display employs color filters to provide different visual states to the user. The display element presents a visual display in response to the application of an electrical signal to at least one of the capsules.
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: March 8, 2005
    Assignee: E Ink Corporation
    Inventors: Paul Drzaic, Russell J. Wilcox
  • Patent number: 6864931
    Abstract: This invention relates to methods of building rigid or flexible arrays of electro-optic devices. A phase separated composite structure technique yields adjacent regions of polymer and liquid crystal (LC) of specific architecture instead of a random dispersion of LC droplets. The above devices can be prepared by producing volutes of LC structure (56) next to a polymer area (58) using anisotropic phase separation of LC from a photopolymer. Initial by UV exposure. The shape, size and placement of these regions inside a cell becomes easily controllable with using optical mask or laser beam. The boundaries of LC volume can be controlled by controlling the chemical composition of the polymer and using an alignment layer (28).
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: March 8, 2005
    Assignee: Kent State University
    Inventors: Satyendra Kumar, Jae-Hoon Kim
  • Patent number: 6847418
    Abstract: A liquid crystal display panel implementing a bistable liquid crystal and fabricating the same is disclosed in the present invention. Specifically, a method of fabricating a liquid crystal display panel having first and second substrates, the method includes forming a first electrode on the first substrate, forming a second electrode on the second substrate, assembling the first and second substrates, forming a bistable twist nematic liquid crystal layer between the first and second substrates, wherein the bistable twist nematic liquid crystal layer having a monomer, aligning the bistable twist nematic liquid crystal layer by applying electric fields, and forming polymer networks by exposing the bistable twist nematic liquid crystal layer to light.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: January 25, 2005
    Assignee: LG. Philips LCD Co., Ltd.
    Inventor: Ku-Hyun Park
  • Patent number: 6844909
    Abstract: A method of manufacturing a ferrodielectric liquid crystal display device includes the steps of injecting melted ferrodielectric liquid crystal in a cell formed between a lower structure body and an upper structure body each having a substrate, an electrode layer, and an orientation film and sealing the cell; cooling to obtain phase transitions of the ferrodielectric liquid crystal corresponding to a bookshelf structure; applying dc potentials to the electrode layers at temperature ranging from temperatures higher than phase transition temperatures to temperatures lower than phase transition temperatures, stopping the dc potential applications and cooling until below a predetermined temperature, and applying a reverse potential to the electrode layers and cooling again. The ferrodielectric liquid crystal display device produced by such a manufacturing method can display clear black-and-white states with the liquid crystal layers having a mono domain of the bookshelf structure.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: January 18, 2005
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong-min Wang, Chang-ju Kim
  • Publication number: 20040246404
    Abstract: Liquid crystal display backplane layouts and addressing for non-standard subpixel arrangements are disclosed. A liquid crystal display comprises a panel and a plurality of transistors. The panel substantially comprises a subpixel repeating group having an even number of subpixels in a first direction. Each thin film transistor connects one subpixel to a row and a column line at an intersection in one of a group of quadrants. The group comprises a first quadrant, a second quadrant, a third quadrant and a fourth quadrant, wherein the thin film transistors are formed in a backplane structure adjacent to intersections of the row and column lines. The thin film transistors are also substantially formed in more than one quadrant in the backplane structure.
    Type: Application
    Filed: June 6, 2003
    Publication date: December 9, 2004
    Inventors: Candice Hellen Brown Elliott, Thomas Lloyd Credelle, Matthew Osborne Schlegel, Seok Jin Han
  • Publication number: 20040233349
    Abstract: An object of the present invention is to provide a light control device having a large transmittance and little scattering of light with no voltage applied and having a small transmittance and little scattering of light with a voltage applied.
    Type: Application
    Filed: June 28, 2004
    Publication date: November 25, 2004
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventors: Takashi Shibuya, Masako Nagashima, Satoshi Niiyama, Shinya Tahara
  • Patent number: 6821455
    Abstract: An electro-optically active polymer gel material comprising a high molecular weight alignment polymer adapted to be homogeneously dispersed throughout a liquid crystal to control the alignment of the liquid crystal molecules and/or confer mechanical stability is provided. The electro-optically active polymer gel comprises a homogenous gel in which the polymer strands of the gel are provided in low concentration and are well solvated by the small molecule liquid crystal without producing unacceptable slowing of its electrooptic response. During formation of the gel, a desired orientation is locked into the gel by physical or chemical cross-linking of the polymer chains. The electro-optically active polymer is then utilized to direct the orientation in the liquid crystal gel in the “field off” state of a liquid crystal display.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: November 23, 2004
    Assignee: California Institute of Technology
    Inventors: Julia A. Kornfield, Michael D. Kempe
  • Patent number: 6819309
    Abstract: A double-face display device is formed of a substrate sheet having a first surface and a second surface, a first display medium disposed over the first surface, a second display medium disposed over the second surface, and a first display electrode and a second display electrode disposed in association with the first display medium and the second display medium, respectively. A first switching device and a second switching device are electrically connected to the first display electrode and the second display electrode, respectively, so that voltages are applied to the first and second display electrodes via the first and second switching devices, respectively, thereby driving the first and second display media to display data on both faces of the display device. The production of the double-face display device is rationalized by disposing the first and second switching devices on a common surface within the display device.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: November 16, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Etsur{overscore (o)} Kishi
  • Publication number: 20040218116
    Abstract: A light controlling film is described comprising a polymerized polymer network of a crosslinked high molecular weight polymeric material and a low molecular weight cholesteric liquid crystal (CLC) material, wherein the high molecular weight and the low molecular weight form a material having cholesteric liquid crystal (CLC) order such that the film is a reflective circular polarizer whose bandwidth is controllable by an electric field impressed in the film.
    Type: Application
    Filed: January 23, 2004
    Publication date: November 4, 2004
    Inventors: Bunsen Fan, Jian-feng Li, Le Li, Sadeg Faris
  • Patent number: 6791658
    Abstract: Two electric fields that are directed to respective directions rectangular relative to each other are selectively applied to polymer dispersed liquid crystal by means of electrodes arranged to sandwich the polymer dispersed liquid crystal and electrodes arranged along a substrate to uniformly orient the liquid crystal in either of the directions. While conventional polymer dispersed liquid crystal is adapted to utilize scatter of light in a randomly oriented state, the polymer dispersed liquid crystal of this invention is adapted to utilize a uniformly oriented state to improve the efficiency of scattering light. The present invention is also applicable to devices where polymer dispersed liquid crystal has a memory property.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: September 14, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomoko Maruyama, Yoshinori Uno
  • Patent number: 6768527
    Abstract: A ferroelectric liquid crystal display and a fabricating method thereof that is capable of maintaining a stable alignment state against external temperature variation and external impact. In the method and apparatus, a ferroelectric liquid crystal containing a small amount of light-hardening polymer is injected between upper and lower substrates provided with alignment film. An ultraviolet ray is irradiated thereon to form a polymer network. The ultraviolet ray has a light intensity range of about 1 to about 5 mW/cm2, and has a light energy range of about 240 to about 1200 mJ/cm2.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: July 27, 2004
    Assignee: LG.Philips LCD Co., Ltd.
    Inventors: Suk Won Choi, Su Seok Choi
  • Patent number: 6721023
    Abstract: The invention provides a multi-layered imaging device for three-dimensional image display, including a plurality of two-dimensional layers superposed in the third dimension, each of the layers having two major surfaces and at least one peripheral edge, the layers being made of a material selected from the group of non-conventional, polarizer-free liquid crystal materials including polymer-dispersed liquid crystals (PDLC) and derivatives and combinations thereof, wherein the exposure of at least one of the layers to illumination allows the transmission of light with minimal losses, facilitating utilization of a maximal number of layers for imaging a three-dimensional display.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: April 13, 2004
    Assignee: ELOP Electro-Optics Industries Ltd.
    Inventors: Victor Weiss, Hanan Rumbak
  • Patent number: 6690447
    Abstract: A method of making a liquid crystal display, comprising the steps of: providing a substrate; providing a first electrode over the substrate; coating the first electrode with aqueous dispersed material which when dried provides a dielectric layer over the first electrode; coating the dielectric layer with liquid crystal bearing material and drying such liquid crystal bearing material and providing a second electrode in contact with the dried liquid crystal bearing material.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: February 10, 2004
    Assignee: Eastman Kodak Company
    Inventors: Stanley W. Stephenson, John I. Kilburn, John W. Boettcher, Thomas M. Smith
  • Patent number: 6678034
    Abstract: A liquid crystal display panel including first and second substrates, and a FLC layer interposed therebetween. A small quantity of additives are mixed in the FLC layer, without changing the electrical or chemical properties of the FLC. Under a proper temperature and an electric field, the FLC layer is ripened sufficiently. Thereafter, the FLC is exposed to light such that polymer networks are formed in the FLC layer due to the polymerization by the additives. The polymer networks connect with each other across molecular layers in the FLC such that the molecules of the FLC are stabilized in proper orientations and maintain their molecular layer structure regardless of the temperature variance. And, the diffraction grating becomes stable regardless of the temperature variance, and fast response time and good gray scale are achieved.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: January 13, 2004
    Assignee: LG.Philips LCD Co., Ltd.
    Inventors: Suk-Won Choi, Hyung-Ki Hong
  • Patent number: 6660344
    Abstract: New photopolymerizable liquid crystalline dioxetane compounds are provided having the general formula I: wherein R1 and R2 are independently selected from straight or branched C1-C4 alkyl and hydrogen; X and X′ are independently selected from oxygen, sulfur, a single covalent bond, —O—CO—, —CO—O—, and —O—CO—O—; Y and Y′ are spacer groups having each independently 1 to 30 carbon atoms (linear or branched), in which the carbon chain may be interrupted by oxygen in the ether function or by sulfur in the thioether function; Z and Z′ are independently selected from oxygen, sulfur, a single covalent bond, —O—CO—, —CO—O—, and —O—CO—O—; and M is any suitable mesogenic group. Also, compositions are provided containing one or more compounds of formula I, as well as methods of preparing said compounds and compositions.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: December 9, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Johan Lub
  • Patent number: 6641873
    Abstract: A method of making a display includes providing a transparent support and providing a conductive transparent layer formed thereover; patterning the transparent conductive layer; and coating a soluble layer including liquid crystal material dispersed in a polymer matrix over the patterned transparent layer and drying such coated soluble layer. The method further includes providing an opaque hydrophobic conductive layer over the dried coated soluble layer; patterning the opaque hydrophobic layer to form conductors leaving exposed portions of the transparent dried coated soluble layer, the position of the conductors relative to the transparent conductive layer defines image pixels; and removing by a solvent the exposed portions of the dried coated soluble layer so that when a potential for each pixel is applied between the patterned transparent conductive layer and patterned corresponding opaque hydrophobic conductors, an image is provided by the dried coated soluble layer which is viewable by an observer.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: November 4, 2003
    Assignee: Eastman Kodak Company
    Inventor: James F. Elman
  • Patent number: 6633354
    Abstract: A light controlling film is disclosed, comprising a polymerized polymer network varying spatially in a direction normal to the film surface, where the polymerized polymer network is a crosslinked high molecular weight polymeric material mixed with a low molecular weight nematic material exhibiting cholesteric liquid crystal (CLC) order, wherein an electric field impressed in the film controls the reflection bandwidth of circularly polarized light.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: October 14, 2003
    Assignee: Reveo, Inc.
    Inventors: Le Li, Bunsen Fan, Yingqiu Jiang, Sadeg M. Faris, Jian-Feng Li
  • Publication number: 20030174264
    Abstract: A light modulating layer formed by providing an emulsion having electro-optical fluid in a gelatin solution, heating the emulsion to reduce the viscosity of the emulsion and coating the heated emulsion on a substrate, lowering the temperature of the coated emulsion to change the state of the coated emulsion from a liquid to a gel state, and drying the coating, while in the high viscosity state, to form a layer of polymer-dispersed domains of electro-optical material.
    Type: Application
    Filed: March 12, 2002
    Publication date: September 18, 2003
    Applicant: Eastman Kodak Company
    Inventors: Stanley W. Stephenson, Charles M. Rankin
  • Patent number: 6618104
    Abstract: An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a fist electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. A plurality of third electrodes are provided through the substrate. Each of the third electrode has a first end part connecting to the second electrode and a second end part exposed to the other side of the substrate. A further light absorption film may be disposed between the reflection film and the second electrode.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: September 9, 2003
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Munekazu Date, Shiro Suyama, Kinya Kato, Kazutake Uehira
  • Patent number: 6583838
    Abstract: A liquid crystal display device including a polyimide alignment layer, having a bistable liquid crystal material and a polymer stabilizer in an amount effective to stabilize the liquid crystal the liquid crystal preferably having a low or medium pretilt angle to eliminate undesired states and stripe tendency and to increase hysteresis. The device has a low driving voltage, low power consumption and fast switching.
    Type: Grant
    Filed: February 22, 2000
    Date of Patent: June 24, 2003
    Assignee: Kent State University
    Inventors: Charles D. Hoke, Philip J. Bos, Jianlin Li
  • Patent number: 6551667
    Abstract: A polymer dispersion type liquid crystal display element having liquid crystal droplets dispersed and held in a continuous matrix phase including polymer compound or a three dimensional network form of matrix including polymer compound dispersed between a pair of substrates, each having an inside electrode. The liquid crystal droplets are in all areas but for an area in the vicinity of the interfaces between the substrates. The liquid crystal droplets are ellipsoid of revolution forms of substantially the same size.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: April 22, 2003
    Inventors: Hirofumi Kubota, Shinya Kosako, Kenji Nakao, Noriko Naito, Tsuyoshi Uemura, Masao Yamamoto
  • Publication number: 20030067267
    Abstract: Conjugated mono-, oligo- and polyalkylidenefluorenes are suitable for use as semiconductors or charge transport materials in optical, electrooptical or electronic devices including field effect transistors, electroluminescent, photovoltaic and sensor devices.
    Type: Application
    Filed: August 19, 2002
    Publication date: April 10, 2003
    Applicant: Merck Patent GmbH
    Inventors: Martin Heeney, Steven Tierney, Mark Giles, Louise Diane Farrand, Maxim Shkunov, David Sparrowe, Iain McCulloch
  • Patent number: 6538814
    Abstract: An active screen reflects a high contrast projected image. The screen has (1) an active layer having visible optical properties changed by an electric field provided by electrodes and (2) a photosensitive layer. The photosensitive layer is such that the electric field across a localized area of the active layer depends on the illumination incident on the photoconductor in that area. The local reflectance of the projection screen thus depends on the intensity of light incident upon it. In one embodiment, the reflectance of the screen increases with increasing light intensity to produce a high contrast reflected image.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: March 25, 2003
    Assignee: Hewlett-Packard Company
    Inventors: Andrew Arthur Hunter, John Christopher Rudin