A dielectric model expression was introduced to evaluate a magnitude of electric field imposed to the liquid /crystalline phases when an external electric field is applied to a (polymer)/(liquid crystal) composite film. It was suggested from the dielectric model calculation that the large electric field is effectively imposed to the liquid crystalline phases by using the matrix polymer with the greater magnitude of dielectric constant and electric conductivity. It was revealed that the electro-optical response speed can be remarkably improved in a wide frequency range by using the matrix polymer with the greater magnitude of dielectric constant and electric conductivity.
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