| 摘要 |
PURPOSE:To obtain a double refraction film at low cost with a simple process which can improve coloring and characteristics of view angle of a liquid crystal display device by using a compd. having specified functional groups to form the double refraction film. CONSTITUTION:An electric field is applied on a film consisting of a polymer containing a compd. having functional group parts with >=1 debye dipole moment. The obtd. double refraction film has such refraction index characteristics that the refractive index in the thickness direction is larger than one of two principal refractive indices in the film plane. Functional groups having >=1 debye dipole moment is, for example, a compd. having electron- donating groups or electron-withdrawing groups as substitutents in a benzene ring. It is preferable that the compd. has both of electron-donating groups and electron-withdrawing groups, and has 3.0 or more debye dipole moment. |
