Polymer Network Liquid Crystal Patents (Class 349/88)
  • Publication number: 20030039770
    Abstract: A liquid crystal device has a liquid crystal layer of a liquid crystal composition comprising a discotic mesomorphic compound and a rod-shaped mesomorphic compound. The discotic mesomorphic compound and the rod-shaped mesomorphic compound are essentially mutually different in molecular structure and refractive index anisotropy and are co-present in the liquid crystal layer in a mutual phase separation state, thus improving a light-scattering performance of the liquid crystal device.
    Type: Application
    Filed: July 24, 2002
    Publication date: February 27, 2003
    Inventors: Koichi Sato, Shinichi Nakamura, Koji Noguchi
  • Patent number: 6497928
    Abstract: A liquid crystal device has a liquid crystal layer of a liquid crystal composition comprising a discotic mesomorphic compound and a rod-shaped mesomorphic compound. The discotic mesomorphic compound and the rod-shaped mesomorphic compound are essentially mutually different in molecular structure and refractive index anisotropy and are co-present in the liquid crystal layer in a mutual phase separation state, thus improving a light-scattering performance of the liquid crystal device.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: December 24, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichi Sato, Shinichi Nakamura, Koji Noguchi
  • Patent number: 6476887
    Abstract: This invention provides a liquid crystal display which comprises a first region including a display region, and a second region being outside the first region, wherein the first and second regions both contain liquid crystal in a polymer network, and a part of the polymer network of the second region is different in structure from the polymer network of the first region, and the part is present in the second region asymmetrically with respect to the first region, and a production method for a liquid crystal display, which comprises providing a liquid crystal material and a prepolymer material in a space between a pair of substrates at least one of which is transparent, and polymerizing the prepolymer material by scanning a first region including a display region and a second region outside the first region with a light beam which causes polymerization.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: November 5, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuhiro Sekine, Shunsuke Inoue, Hiroshi Mizuno
  • Patent number: 6473143
    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 exibiting cholesteric liquid crystal (CLC) order, wherein wherein an electric field impressed in the film controls the reflection of circularly polarized light.
    Type: Grant
    Filed: June 5, 1998
    Date of Patent: October 29, 2002
    Assignee: Reveo, Inc.
    Inventors: Jian-feng Li, Le Li, Bunsen Fan, Yingqiu Jiang, Sadeg Faris
  • Patent number: 6469757
    Abstract: A process selectively removes a light modulating layer containing a liquid crystalline material dispersed in a polymeric binder from the electrically conductive layer of a liquid crystal display web. The provided web comprises a flexible substrate, an electrically conducting layer disposed on the substrate, and a light modulating layer disposed on the electrically conductive layer. The light modulating layer inclues a liquid crystalline material dispersed in a polymeric binder and has an upper surface. The web is transported at a controlled rate of speed from a first station to a second station that is situated at a selected distance from the first station. At the first station, a solvent effective for softening the light modulating layer is applied at a controlled rate to a selected portion of the upper surface, thereby forming a selected softened portion of the light modulating layer.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: October 22, 2002
    Assignee: Eastman Kodak Company
    Inventor: Dwight J. Petruchik
  • Patent number: 6452651
    Abstract: The invention provides a liquid crystal display having high reliability, which is excellent in terms of optical characteristics, heat resistance, and shock resistance, wherein a liquid crystal display consisting of a cholesteric liquid crystal, a chiral nematic liquid crystal or a liquid crystal 1 layer, being a combination thereof, which is roughly pillar-like and polygonal in section or has a roughly pillar-like form enclosed by a closed curve, and divided by said polymer network into areas whose minimum diameter measured by vernier calipers is 5 &mgr;m and whose maximum diameter measured by vernier calipers is 100 &mgr;m, is obtained by polymer networks 4 formed by polymerization of monomer, so that sufficient reflection can be obtained from the liquid crystal 1 without being optical scattering.
    Type: Grant
    Filed: September 14, 2000
    Date of Patent: September 17, 2002
    Assignee: Nanox Corporation
    Inventors: Manabu Takami, Masaki Kitaoka, Ayumi Sasaki, Tomio Wada
  • Patent number: 6441551
    Abstract: The present invention provides the EL device and apparatus each of which has a white appearance in the non-light-emitting state, and can emit white light with high luminance in the light-emitting state. When such an EL device or apparatus is used, the light-emitting surface provides a background with high whiteness both in the light-emitting and non-light-emitting state, and can highlight a light-transmitting printed layer formed on the light-emitting surface.
    Type: Grant
    Filed: January 3, 2000
    Date of Patent: August 27, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Hidetoshi Abe, Yoshinori Araki
  • Patent number: 6437841
    Abstract: A display device (1) is provided with a means (15) for selectively transmitting and blocking light from specific areas of the image. The means for blocking comprises an LCD cells or a number of LCD cells, which cells comprises an oriented polymer network, an LC material with negative &Dgr;&egr; and a pleochroic dye.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: August 20, 2002
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Dirk Jan Broer, Hendrik De Koning, Gosse Charles De Vries, Mark Thomas Johnson
  • Publication number: 20020085145
    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: Application
    Filed: June 29, 2001
    Publication date: July 4, 2002
    Inventor: Su Seok Choi
  • Publication number: 20020080305
    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: Application
    Filed: December 7, 2001
    Publication date: June 27, 2002
    Inventors: Suk Won Choi, Su Seok Choi
  • Publication number: 20020054251
    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: Application
    Filed: September 12, 2001
    Publication date: May 9, 2002
    Inventors: Tomoko Maruyama, Yoshinori Uno
  • Patent number: 6379850
    Abstract: A rewritable thermosensible recording material shown by the following chemical formula. This recording material can be produced by condensing a derivative of dicarboxylic acid and cholesterol or by making halide dicarboxylic acid and cholesterol react to each other. By locating this material purely or as a mixture between a base layer and a transparent protective layer, a rewritable thermosensible recording medium can be obtained.
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: April 30, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Hideaki Ueda, Tsuyoshi Nozaki, Shoji Kotani
  • Patent number: 6369868
    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: June 5, 1998
    Date of Patent: April 9, 2002
    Assignee: Reveo, Inc.
    Inventors: Bunsen Fan, Jian-feng Li, Le Li, Sadeg Faris
  • Patent number: 6368680
    Abstract: A method of making a polymer dispersion type liquid crystal display element including a phase separation step. The method calls for placing a liquid crystal polymer precursor compatible solution having a liquid crystal and a polymer precursor between a pair of substrates, each having an inside electrode, and irradiating a substrate surface with ultraviolet. The radiation causes a phase separation of the liquid crystal and the polymer precursor as well as polymerization and curing of the precursor. The method forms a polymer dispersion type liquid crystal having liquid crystal droplets dispersed and held in a continuous matrix phase or a three-dimensional network matrix.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: April 9, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hirofumi Kubota, Shinya Kosako, Kenji Nakao, Noriko Naito, Tsuyoshi Uemura, Masao Yamamoto
  • Publication number: 20020039156
    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 exibiting cholesteric liquid crystal (CLC) order, wherein wherein an electric field impressed in the film controls the reflection of circularly polarized light.
    Type: Application
    Filed: June 5, 1998
    Publication date: April 4, 2002
    Inventors: JIAN-FENG LI, LE LI, BUNSEN FAN, YINGQIU JIANG, SADEG FARIS
  • Patent number: 6365239
    Abstract: A polymer dispersion type liquid crystal display element having a polymer dispersion type liquid crystal sandwiched between a pair of substrates, each having an inside electrode, is disclosed. The liquid crystal has liquid crystal droplets dispersed and held in either a polymer compound-containing continuous phase matrix or a three dimensional network of such a matrix. In one embodiment, the capacitance hysteresis, defined as Chys=(C2−C1)/Cmax, does not exceed 1.5%. C1 is the capacitance for an applied voltage that is in the process of rising a voltage-capacitance characteristic; C2 is the capacitance of an applied voltage in the process of dropping; and C2 is the capacitance of a maximum applied voltage. In another embodiment, the Chys value does not exceed 0.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: April 2, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hirofumi Kubota, Shinya Kosako, Kenji Nakao, Noriko Naito, Tsuyoshi Uemura, Masao Yamamoto
  • Patent number: 6355314
    Abstract: A polymer dispersion type liquid crystal display element is disclosed. The element has a polymer dispersion type liquid crystal sandwiched between a pair of substrates, each having an inside electrode. Liquid crystal droplets are dispersed either in a polymer matrix continuous phase or in a three-dimensional matrix-containing polymer. When no voltage is applied to the electrodes, the liquid crystal molecules in the droplets present a bipolar-form orientation pattern having at least two poles in the vicinity of the interfaces between the liquid crystal droplets and the polymer. When a clear point transition temperature of the liquid crystal is Tni, the pattern of bipolar-form orientation is maintained at least when the element is operating at a temperature in the range of 5° C. to (Tni−5)° C.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: March 12, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hirofumi Kubota, Shinya Kosako, Kenji Nakao, Noriko Naito, Tsuyoshi Uemura, Masao Yamamoto
  • Patent number: 6355315
    Abstract: A method of forming a polymer dispersion type liquid crystal display element having a polymer dispersion type liquid crystal sandwiched between a pair of substrates, each having an inside electrode, is disclosed. The droplets either are dispersed and held in a continuous matrix phase of the polymer or held in a three dimensional network of a matrix containing the polymer. In the method, the value of (V90×R/d is at least 0.7 where V90 is that voltage required for transmittance of a voltage-transmittance characteristic of the display element to be 90% when the element is at 30° C., d is the interval between the substrate pair, and R is the average particle size of the liquid crystal droplets.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: March 12, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hirofumi Kubota, Shinya Kosako, Kenji Nakao, Noriko Naito, Tsuyoshi Uemura, Masao Yamamoto
  • Patent number: 6351298
    Abstract: A reflective type liquid crystal display device in accordance with the present invention includes a reflector film having excellent polarization preservation properties and an anisotropic diffusing film for diffusing only the light polarized in a particular direction. The anisotropic diffusing film is composed of a complex of liquid crystal and a polymer and selectively diffuses incident light. If a liquid crystal layer composed of dichroic dye and liquid crystal is employed, it becomes possible to carry out high contrast display with the anisotropic diffusing film and the reflector film and to prevent reflections of nearby objects appearing on the screen.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: February 26, 2002
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiichi Mitsui, Masayuki Okamoto, Shun Ueki
  • Publication number: 20020001052
    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: Application
    Filed: April 5, 2001
    Publication date: January 3, 2002
    Inventors: Julia A. Kornfield, Michael D. Kempe
  • Patent number: 6331881
    Abstract: A liquid crystal device comprises a pair of substrates; and a composite layer disposed between the pair of substrates, the composite layer including a resin phase and a liquid crystal phase of a liquid crystal material exhibiting cholesteric characteristic, the composite layer having an area defining one pixel, and the area including a plurality of regions being different from each other in condition of the resin phase. A method of producing a liquid crystal device comprises the steps of defining an area corresponding to one pixel; and forming a plurality of regions of composite layer in the area, the composite layer including a resin phase and a liquid crystal phase of a liquid crystal material exhibiting cholesteric characteristic, and each of the regions being different from the others in condition of the resin phase.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: December 18, 2001
    Assignee: Minolta Co., Ltd.
    Inventors: Takuji Hatano, Masakazu Okada
  • Publication number: 20010050734
    Abstract: Transflective display device provided with an optical waveguide which splits light coming in from aside into two light beams having a mutually opposite circular polarization. Polarization splitting is achieved at the interface of areas in the optical waveguide having a chiral nematic structure.
    Type: Application
    Filed: December 27, 2000
    Publication date: December 13, 2001
    Inventors: Hugo Johan Cornelissen, Dirk Jan Broer, Peter Van De Witte
  • Patent number: 6313894
    Abstract: This invention provides a liquid crystal display which comprises a first region including a display region, and a second region being outside the first region, wherein the first and second regions both contain liquid crystal in a polymer network, and a part of the polymer network of the second region is different in structure from the polymer network of the first region, and the part is present in the second region asymmetrically with respect to the first region, and a production method for a liquid crystal display, which comprises providing a liquid crystal material and a prepolymer material in a space between a pair of substrates at least one of which is transparent, and polymerizing the prepolymer material by scanning a first region including a display region and a second region outside the first region with a light beam which causes polymerization.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: November 6, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuhiro Sekine, Shunsuke Inoue, Hiroshi Mizuno
  • Patent number: 6306469
    Abstract: The invention provides a method of filling a PDLC cell, a polymerizable mixture suitable for this purpose as well as a display device provided with such a PDLC cell. The mixture in accordance with the invention comprises two types of non-volatile reactive monomers, the first type of monomer being readily miscible with liquid crystalline material and the second type of monomer being poorly miscible with the liquid crystalline material. Such mixtures prove to be very stable. In addition, when such mixtures are used in cells, problems regarding compositional drift do not occur. Cells in which the inventive mixture is used demonstrate a relatively low hysteresis as well as a relatively low switching voltage. By virtue thereof, it is very attractive to use these cells in a display device.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: October 23, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Christoph Serbutoviez, Johan G. Kloosterboer, Fredericus J. Touwslager
  • Patent number: 6304306
    Abstract: A liquid crystal display device includes substrates opposed to each other, a polymeric layer patterned into a predetermined pattern, and a liquid crystal layer at least partially surrounded by the polymeric layer. The polymeric layer and the liquid crystal layer are interposed between the substrates. The polymeric layer is at least partially formed by polymerizing a liquid crystalline polymerization precursor in a state where the molecules of the liquid crystalline polymerization precursor are aligned in a predetermined direction by an alignment regulating force of at least one of the substrates.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: October 16, 2001
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Makoto Shiomi, Shinji Yamagishi, Tokihiko Shinomiya, Shuichi Kozaki, Kohichi Fujimori
  • Patent number: 6291034
    Abstract: Liquid crystal compounds of formula (I) are described, where formula (I) is given as R1—A—(X)m—(B)n—R2 where A is selected from naphthyl, fluorinated naphthyl, brominated naphthyl, B is selected from phenyl, methylated phenyl, brominated phenyl, fluorinated phenyl, thiophene, pyrimidine and pyridine. R1 and R2 are independently selected from alkyl, alkoxy, akynyl, thioalkyl, Br, CN, SCN, NCS, perfluoroalkyl, perfluoroalkoxy and hydrogen, X is selected from C≡C, COO and C≡C, m is 0 or 1, n is 0 or 1 where m is 1 and n is 0 where m is 0; provided that where A is naphthyl, n is 1 and m is 0 then B is selected from methylated phenyl, brominated phenyl, thiophene, pyrimidine and pyridine; and further provided that where A is naphthyl, X is C≡C, m is 1 and n is 1, then B is selected from thiophene, pyrimidine and pyridine.
    Type: Grant
    Filed: September 10, 1998
    Date of Patent: September 18, 2001
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Kenneth Johnson Toyne, John William Goodby, Alexander Seed, George William Gray, Damien Gerad McDonnel, Edward Peter Raynes, Sally Elizabeth Day, Kenneth John Harrison, Michael Hird
  • Publication number: 20010017685
    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: Application
    Filed: January 30, 2001
    Publication date: August 30, 2001
    Inventor: Ku-Hyun Park
  • Patent number: 6278508
    Abstract: A reflector electrode is provided with hills and valleys thereon, and the reflector electrode is formed on an inside face of a transparent substrate having a transparent electrode and an opposite substrate. Light-scattering-liquid-crystal is provided with forward-scattering component and back-scattering component, so that scattering of reflected light from the reflector electrode is increased when the light-scattering-liquid-crystal is transparent. As a result, contrast is less dependent on a viewing angle, and a brighter quality display with higher color purity can be obtained.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: August 21, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsu Ogawa, Shingo Fujita, Hiroaki Mizuno, Yoshio Iwai
  • Patent number: 6275276
    Abstract: A liquid crystal display having a pair of substrates having electrodes on opposing surfaces thereof, at least one of the substrates being transparent. A continuous liquid crystal layer is sandwiched between the pair of substrates and the liquid crystal layer includes first and second liquid crystal gel layers each with polymer enabling alignment. A direction of orientation of the liquid crystal molecules included in the first liquid crystal gel layer is orthogonal to a direction of orientation of the liquid crystal molecules included in the second liquid crystal gel layer.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: August 14, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Komura, Yuji Mori, Junichi Hirakata, Masahiko Ando, Osamu Itou, Ikuo Hiyama
  • Patent number: 6266113
    Abstract: A reflection type liquid crystal display device according to the present invention is constructed to include: a light modulation layer having a light scattering state changed when a voltage is applied between electrode faces; at least one kind of color separation layer arranged at the back of the liquid crystal; and a reflection layer arranged at the back of the color separation layer. The light modulation layer is a polymer network type polymer scattered liquid crystal layer or a phase conversion type liquid crystal layer, and the color separation mirror is a cholesteric liquid crystal polymer layer or a dielectric multi-layered thin film characterized to reflect a light within a predetermined wavelength range in the visible light region selectively. A reflection preventing layer and an ultraviolet ray cut-off layer are further arranged on the surfaces of the electrode faces.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: July 24, 2001
    Assignee: Seiko Instruments Inc.
    Inventors: Osamu Yamazaki, Shunichi Motte, Teruo Ebihara, Shigeru Senbonmatsu, Kaori Taniguchi, Takakazu Fukuchi, Hiroshi Sakama, Masafumi Hoshino, Naotoshi Shino, Shuhei Yamamoto
  • Patent number: 6266109
    Abstract: A liquid crystal optical switching element comprising a pair of substrates disposed to face to each other with a space being interposed therebetween, a medium interposed between the pair of substrate and composed of a liquid crystal material partitioned into small sections, and a material for partitioning a region of the liquid crystal material into the small sections, and voltage-applying means to apply an voltage to the medium. This medium is optically isotropic at the moment when no voltage is applied to the medium and capable of exhibiting an optical anisotropy which is proportional to a square of electric field intensity when a voltage is applied to the medium.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: July 24, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hajime Yamaguchi, Yasushi Kawata
  • Patent number: 6261650
    Abstract: A polymer dispersed liquid crystal (PDLC) display element for use in an electronic apparatus wherein the display element operates in a PDLC mode or reverse PDLC mode providing for reduction of visual display haze, improved display contrast. The particular medium includes a liquid crystal portion and a polymer portion and may include a chiral component. In cases where visual display haze and contract is a particular problem in the utility of the reverse PDLC display element, such as in the case where the display element is combined with a solar battery, a sufficient amount of dichroic dye is added to the liquid crystal portion of the medium, and, further, a compound showing no fluorescence emission with respect to a liquid crystal portion, or a polymer or a chiral polymer precursor portion of the medium, is employed.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: July 17, 2001
    Assignee: Seiko Epson Corporation
    Inventors: Hidekazu Kobayashi, Eiji Chino, Masayuki Yazaki, Hidehito Iisaka
  • Publication number: 20010005244
    Abstract: A display device (1) is provided with a means (15) for selectively transmitting and blocking light from specific areas of the image. The means for blocking comprises an LCD cells or a number of LCD cells, which cells comprises an oriented polymer network, an LC material with negative &Dgr;&egr; and a pleochroic dye.
    Type: Application
    Filed: December 22, 2000
    Publication date: June 28, 2001
    Inventors: Dirk Jan Broer, Hendrik De Koning, Gosse Charles De Vries, Mark Thomas Johnson
  • Patent number: 6218679
    Abstract: A liquid crystal display panel includes a counter substrate having a counter electrode and a multi-layered dielectric film both formed thereon, and an array substrate formed with pixel electrodes and thin-film transistors serving as switching elements. A layer of polymer dispersed liquid crystal material containing a UV-curable resin component and a liquid crystal component is sandwiched and sealed between the counter and array substrates. A light shielding film is formed over each thin-film transistor. The multi-layered dielectric film is a laminated structure of alternating thin-films of SiO2 and HfO2. Since the multi-layered dielectric film is of a nature capable of transmitting UV-rays of light therethrough, the UV-curable resin component positioned underneath the multi-layered dielectric film can be cured during the manufacture.
    Type: Grant
    Filed: July 9, 1999
    Date of Patent: April 17, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Takahara, Shinya Sannohe
  • Patent number: 6215543
    Abstract: In order to reduce the effects of impact on liquid crystal devices a polymer network is introduced into ferroelectric liquid crystal cells. A liquid crystal device comprises two spaced cell walls each bearing electrode structures and treated on at least one facing surface with an alignment layer, a layer of a smectic liquid crystal material enclosed between the cell walls, characterised in that the liquid crystal material contains a small amount of monomer. The liquid crystal material may also contain a photoinitiator. The monomer material may be cured to produce the polymer networks the curing many be carried out in the presence of an electric or magnetic field. Further, the monomer may be cured in an isotropic or liquid crystal phase.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: April 10, 2001
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Ian Robert Mason, Damien Gerard McDonnell, John Clifford Jones, Guy Peter Bryan-Brown
  • Patent number: 6177972
    Abstract: An in-plane switched liquid crystal device IPS LCD which provides fast switching times is formed by filling an empty IPS LCD panel having an array of display elements with a mixture of nematic liquid crystal material and a mesogenic polymerizable material, such as monomers or polymer precursers and suitable photoinitiators, curing, or cross-linking agents, and then polymerizing the mixture such that a phase-separated network of cross-linked polymer strands is formed. The cross-linked network of polymer strands displays an average orientation whose average orientation substantially conforms with nematic orientation of the nematic liquid crystal material in its “field-off” state.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: January 23, 2001
    Assignee: International Business Machines Corporation
    Inventors: Glenn Allen Held, Shui-Chih Alan Lien, Do Yeung Yoon
  • Patent number: 6175397
    Abstract: A liquid crystal display apparatus comprises a first polymer-containing liquid crystal area forming a first area including a display area, and a second polymer-containing liquid crystal area including a second area other than the first area, and is characterized in that polymer of the first polymer-containing liquid crystal area and polymer of the second polymer-containing liquid crystal area respectively have network structures different from each other.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: January 16, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunsuke Inoue, Yasuhiro Sekine, Hiroshi Mizuno
  • Patent number: 6157425
    Abstract: A liquid crystal display device comprises extended polymer networks formed in the liquid crystal cells. By adding a monomer and a photo-initiator into the liquid crystal material of a liquid crystal display, applying a bias voltage and exposing the display under a UV light, a polymer network can be formed. The polymer network modifies the electro-optical characteristic of a liquid crystal display device. With different bias voltages, polymer networks of different structures can be formed so that the color difference of the liquid crystal display with respect to red, green and blue light can be minimized. Liquid crystal display devices of fast switching response and low color dispersion can be fabricated.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: December 5, 2000
    Assignee: Industrial Technology Research Institute
    Inventors: Chen-Lung Kuo, Chung-Kuang Wei, Yong-Hong Lu
  • Patent number: 6133975
    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, preferably about 2 weight percent, associated with the liquid crystal material, the liquid crystal having a low pretilt angle, to eliminate stripe tendency and to increase hysteresis. The device has a low driving voltage, low power consumption and fast switching.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: October 17, 2000
    Assignee: Kent State University
    Inventors: Jianlin Li, Philip J. Bos
  • Patent number: 6128056
    Abstract: A liquid crystal display element includes a polymer liquid crystal composite layer in which liquid crystal droplets are dispersed and held in a continuous phase of matrix comprising polymer compound, or liquid crystals are dispersed and held in networks of matrix of a three dimensional network form comprising polymer compound. All areas of this polymer liquid crystal composite layer, except a non-active area, in which cracks will develop, in the vicinity of a sealant, is formed as an active area, so that, even when the cracks develop, stripy display unevenness caused by the cracks can be prevented from being visually confirmed on a display screen.
    Type: Grant
    Filed: February 2, 1999
    Date of Patent: October 3, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hirofumi Kubota, Kenji Nakao, Tsuyoshi Uemura
  • Patent number: 6122024
    Abstract: A switchable liquid crystal device, for instance for use as a reflective display, includes a cell containing a helical polymer network and a nematic liquid crystal. Electrodes are provided for applying a field across the cell so as to switch between different optical states. In a reflective state, the cell reflects incident light within a waveband which is relatively insensitive to temperature variations. The device is formed by filling the cell with the liquid crystal and polymer precursor material and then cross-linking or polymerising, for instance by photopolymerisation, the precursor material to form the helical polymer network.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: September 19, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Henning Molsen, Martin David Tillin, Tomoaki Kuratate
  • Patent number: 6108061
    Abstract: Monomers with photopolymerization characteristics and an initiator for polymerization are added to a liquid crystal composition having a ferroelectric liquid crystal phase (S5). In a state (S6) where coexist two domains which differ from each other in directions of molecular major axes in the ferroelectric liquid crystal phase, light is projected to the liquid crystal layer to form a polymer reticulate structure therein (S7). As a result, this state is made a stable one and the liquid crystal shows macroscopic switching behaviors among two states causing dark and bright displays respectively, and the above-described state causing halftone display.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: August 22, 2000
    Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the Kingdom of Great Britain and Northern Ireland
    Inventors: Teiyu Sako, Aya Miyazaki, Akira Sakaigawa, Mitsuhiro Koden
  • Patent number: 6108062
    Abstract: A liquid crystal optical device including a liquid crystal/polymer composite film including of a matrix polymer composed mainly of a transparent resin having an ionic dissociative group and, dispersed therein, a liquid crystal particle; and conductive substrates sandwiching the liquid crystal/polymer composite film therebetween, at least one of the conductive substrates being transparent.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: August 22, 2000
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Satoshi Takeuchi, Masayuki Ando, Tatsuya Tabei, Tadafumi Shindo, Hiroki Maeda, Hideshi Hattori, Kei Ikegami
  • Patent number: 6075583
    Abstract: In order to the effects of impact on liquid crystal devices a polymer network is introduced into ferroelectric liquid crystal cells. A liquid crystal device comprises two spaced cell walls each bearing electrode structures and treated on at least one facing surface with an alignment layer, a layer of a smectic liquid crystal material enclosed between the cell walls, characterised in that the liquid crystal material contains a small amount of monomer. The liquid crystal material may also contain a photoinitiator. The monomer material may be cured to produce the polymer network; the curing may be carried out in the presence of an electric or magnetic field. Further, the monomer may be cured in an isotropic or liquid crystal phase.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: June 13, 2000
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Ian Robert Mason, Damien Gerard McDonnell, John Clifford Jones, Guy Peter Bryan-Brown
  • Patent number: 6072552
    Abstract: A liquid crystal layer comprising a liquid crystal display has first and second liquid crystal gel layers orientated so that polymer threads are of fixed directions within a dichroic liquid crystal. The direction of orientation of the polymer threads included in the first liquid crystal gel layer and the direction of orientation of the polymer threads included in the second liquid crystal gel layer are orthogonal with respect to each other.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: June 6, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Komura, Yuji Mori, Junichi Hirakata, Masahiko Ando, Osamu Itou, Ikuo Hiyama
  • Patent number: 6023312
    Abstract: An optical device employs a composite of a liquid crystalline substance and an orientation-sustaining material, such as a selected polymer, flat particles, or other material capable of sustaining the state of orientation of the liquid crystalline substance. The optical device has a memory function which is erased by the application of an electrical signal. External force for writing on the device generates local changes of the state of orientation of the liquid crystalline substance. The written display is memorized, and can be erased by the application of an electrical signal. When a two-frequency-driving liquid crystalline substance is used, the device has a long-term memory function. In this device, writing can be conducted at one frequency and erasure easily conducted at the other frequency. These optical devices can be used for light adjustment, display, and data storage.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: February 8, 2000
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Naoki Hasegawa, Masaya Kawasumi, Arimitsu Usuki, Akane Okada
  • Patent number: 6018378
    Abstract: A composition for use in a liquid crystal optical element, such as a liquid crystal display or laser shutter device, comprised of a liquid crystal material and a solidified polymer material. The liquid crystal is such that its refractive index is changed depending on states of applying a voltage. In one state, the refractive index of the liquid crystal substantially coincides with the refractive index of the solidified matrix to thereby pass light. While in the other state, the refractive index of the liquid crystal does not coincide with the refractive index of the solidified matrix to thereby cause the scattering of light. Specifically, the liquid crystal material used in the composition has a refractive index anisotropy (.DELTA.n) is greater than 0.18 and the dielectric anisotropy (.DELTA..epsilon.) satisfies the relation of 5<.DELTA..epsilon.<11.6.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: January 25, 2000
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Yoshinori Hirai, Satoshi Niiyama, Tomoki Gunjima, Masanori Yuki, Masaya Kunigita, Yukio Yoshikawa, Eiji Shidoji
  • Patent number: 6015507
    Abstract: A liquid crystal element includes a pair of plates at least one of which is transparent, and a composite layer retained between the plates and including a liquid crystal material in a transparent resin substrate.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: January 18, 2000
    Assignee: Minolta Co., Ltd.
    Inventors: Nobuyuki Kobayashi, Kiyofumi Hashimoto, Takuji Hatano
  • Patent number: 6014194
    Abstract: A liquid crystal display device comprises extended polymer networks formed in the liquid crystal cells. By adding a monomer and a photo-initiator into the liquid crystal material of a liquid crystal display, applying a bias voltage and exposing the display under a UV light, a polymer network can be formed. The polymer network modifies the electro-optical characteristic of a liquid crystal display device. With different bias voltages, polymer networks of different structures can be formed so that the color difference of the liquid crystal display with respect to red, green and blue light can be minimized. Liquid crystal display devices of fast switching response and low color dispersion can be fabricated.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: January 11, 2000
    Assignee: Industrial Technology Research Institute
    Inventors: Chen-Lung Kuo, Chung-Kuang Wei, Yong-Hong Lu
  • Patent number: 5993689
    Abstract: A polymer dispersed liquid crystal (PDLC) display element for use in an electronic apparatus wherein the display element operates in a PDLC mode or reverse PDLC mode providing for reduction of visual display haze, improved display contrast. The particular medium includes a liquid crystal portion and a polymer portion and may include a chiral component. In cases where visual display haze and contract is a particular problem in the utility of the reverse PDLC display element, such as in the case where the display element is combined with a solar battery, a sufficient amount of dichroic dye is added to the liquid crystal portion of the medium, and, further, a compound showing no fluorescence emission with respect to a liquid crystal portion, or a polymer or a chiral polymer precursor portion of the medium, is employed.
    Type: Grant
    Filed: February 12, 1997
    Date of Patent: November 30, 1999
    Assignee: Seiko Epson Corporation
    Inventors: Hidekazu Kobayashi, Eiji Chino, Masayuki Yazaki, Hidehito Iisaka