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- 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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| 2. |
- Komitov, Lachezar, 1944, et al.
(författare)
-
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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| 3. |
- Komitov, Lachezar, 1944, et al.
(författare)
-
Method of fabricating electro-optical devices with polymer-stabilized liquid crystal molecules
- 2006
-
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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