Optical bodies containing cholesteric liquid crystal...

G - Physics – 02 – F

Patent

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G02F 1/1335 (2006.01) G02B 5/30 (2006.01)

Patent

CA 2438920

An optical body includes a substrate and a cholesteric liquid crystal layer disposed on the substrate. The cholesteric liquid crystal layer has a non- uniform pitch along a thickness direction of the layer and comprises a crosslinked polymer material that substantially fixes the cholesteric liquid crystal layer. The crosslinking hinders diffusion of cholesteric liquid crystal material within the cholesteric liquid crystal layer. In other methods of making an optical body, a reservoir of chiral material is provided during the process over a first cholesteric liquid crystal layer to diffuse into the layer and provide a non-uniform pitch. Alternatively, two coating compositions can be disposed on a substrate where the material of the first coating composition is not substantially soluble in the second coating composition.

L'invention concerne un corps optique contenant un substrat et une couche de cristaux liquides cholestériques disposée sur le substrat. La couche de cristaux liquides cholestériques présente une inclinaison non uniforme le long d'une direction d'épaisseur de la couche et comporte un matériau polymère réticulé fixant essentiellement la couche de cristaux liquides cholestériques. La réticulation empêche la diffusion des cristaux liquides cholestériques dans la couche de cristaux liquides cholestériques. L'invention concerne également un procédé de fabrication d'un corps optique consistant à mettre en oeuvre lors du processus un réservoir de matériau chiral sur une première couche de cristaux liquides cholestériques de manière que ledit matériau diffuse dans la couche et crée une inclinaison non uniforme. Dans un autre mode de réalisation, deux compositions de revêtement peuvent être disposées sur un substrat, le matériau de la première composition de revêtement n'étant essentiellement pas soluble dans la deuxième composition de revêtement.

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