| 1. |
- Helgee, Bertil, et al.
(författare)
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Liquid crystal device and its manufacture
- 2005
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- The invention relates to a liq. crystal device comprising a liq. crystal bulk layer and a dynamic surface-director alignment layer, wherein the liq. crystal bulk layer comprises a liq. cryst. material possessing a phase sequence consisting of isotropic phase, nematic phase and optionally cryst. phase (s), and the surface-director alignment layer comprises a chiral smectic liq. cryst. polysiloxane. The invention also relates to a method for its manufg.
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| 2. |
- Komitov, Lachezar, 1944, et al.
(författare)
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Electro-optical devices from polymer-stabilized liquid crystal molecules
- 2005
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- Electrooptical devices are described which comprise first and second spaced-apart surfaces defining a gap; a chiral or cholesteric liq. crystal material disposed in the gap; and a polymeric network disposed in the gap, the polymeric network being .ltorsim.5 wt. % of the liq. crystal and biasing the liq. crystal material toward a substantially uniformly lying helix texture. The polymeric network may extend only partway into the liq. crystal cell leaving at least a portion of the liq. crystal cell substantially free of the polymeric network. Methods for producing the devices are described which entail disposing a chiral or cholesteric liq. crystal, a photoreactive monomer, and a photoinitiator in a liq. crystal cell; and illuminating a principal surface of the liq. crystal cell with UV light selected to have a nonuniform intensity profile in the liq. crystal cell, the illuminating cooperating with the photoinitiator to polymerize at least a portion of the photoreactive monomer near the principal surface to generate a polymer network having a d. corresponding to the non-uniform a UV light intensity profile, the polymer network biasing the liq. crystal toward a selected helical alignment direction.
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| 3. |
- Komitov, Lachezar, 1944, et al.
(författare)
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Liquid crystal device and method its fabrication
- 2004
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- The invention relates to a liq. crystal device comprising a liq. crystal bulk layer and a surface-director alignment layer comprising side-chains arranged to interact with the bulk layer, wherein the orientation of the bulk layer mols. and the orientation of said side-chains each is directly controllable by an elec. field via dielec. coupling, thus resulting in a decreased total time period (rise and decay times) needed to switch and relax the liq. crystal bulk mols. in response to an applied external field. The invention also relates to a method for manufg. a liq. crystal device and a method of controlling a liq. crystal bulk layer.
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| 4. |
- Komitov, Lachezar, 1944, et al.
(författare)
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Method for manufacturing electro-optical device by use of polymer stabilized liquid crystal molecules
- 2008
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- The title method comprises arranging chiral or cholesteric liq. crystal (LC), photoreaction monomers and photosensitive initiator in an LC unit cell, and irradiating primary surface of the LC unit cell via UV light having non-uniform intensity distribution in the LC unit cell. The irradn. matches the photosensitive initiator for polymg. at least partial photoreaction monomers near the primary surface, so as to generate polymer network with d. corresponding to the intensity distribution of the non-uniform UV light, wherein the polymer network makes the LC bias to selected helical arrangement direction.
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| 5. |
- Komitov, Lachezar, 1944, et al.
(författare)
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Method of fabricating electro-optical devices with polymer-stabilized liquid crystal molecules
- 2006
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- In a prepn. method, a chiral or cholesteric liq. crystal, a photoreactive monomer, and a photoinitiator are disposed in a liq. crystal cell. A principal surface of the liq. crystal cell is illuminated with UV light selected to have a nonuniform UV light intensity profile in the liq. 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 d. corresponding to the nonuniform UV light intensity profile. The polymer network biases the liq. crystal toward a selected helical alignment direction. In some embodiments, the illuminating includes illuminating with 1st and 2nd UV light intensity profiles to produce surface and vol. polymer network components.
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| 6. |
- Komitov, Lachezar, 1944, et al.
(författare)
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Polymers for use as alignment layers in liquid crystal devices
- 2004
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- The invention relates to a polymer for use as a surface-director alignment layer in a liq. crystal device, said polymer comprising a polymeric backbone and side-chains attached thereto, wherein the polymeric backbone lacks directly coupled ring structures, and each side-chain of at least some of the side-chains comprises >=2 unsubstituted and/or substituted phenyls coupled via a coupling selected from a carbon-carbon single bond, a carbon-carbon double bond contg. unit (CH:CH), a carbon-carbon triple bond contg. unit (C==C), a methylene eter unit (CH2O) , an ethylene eter unit (CH2CH2O), an ester unit (COO) and an azo unit (N:N), exhibits a permanent and/or induced dipole moment that in ordered phase provides dielec. anisotropy, and is attached to the polymeric backbone via at least two spacing atoms. Thus, 4'-(11,11-diethoxyundecyloxy)biphenyl-4-carbonitrile 0.70, octanal 0.081, and polyvinyl alc. 0.198 g were reacted in DMF at 55 Deg for 24 h to give a side-chain liq. crystal polymer, which was fabricated into a liq. crystal device as alignment layer.
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| 7. |
- Kozachenko, Andriy, et al.
(författare)
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Cholesteric liquid crystal display (LCD) device, and method for its production
- 2006
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- A liq. crystal device is disclosed, having one or several display segments, and comprising: a first display substrate, a second display substrate, a layer of liq. crystal material disposed between said first and second substrate; and layer of conductive material disposed on said substrates. The conductive layers form electrodes for applying an elec. field across the liq. crystal for switching the liq. crystal material between a first optical state and a second optical state different from said first optical state. Image features of the display are further defined by the inclusion of a layer of patterned non-conductive or passive dielec. material on at least one of the substrates, said patterned material forming a mask defining image elements of the display segments.
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