申请人:Alliant Techsystems Inc.
公开号:US05731405A1
公开(公告)日:1998-03-24
A process for inducing pre-tilt in alignment of a liquid crystal medium comprising exposing at least one optical alignment layer, comprising anisotropically absorbing molecules and hydrophobic moieties, to polarized light; the polarized light having a wavelength within the absorption band of said anisotropically absorbing molecules; wherein the exposed anisotropically absorbing molecules induce alignment of the liquid crystal medium at an angle + and -.theta. with respect to the direction of the polarization of the incident light beam and along the surface of the optical alignment layer, and induce a pre-tilt at an angle .PHI. with respect to the surface of the optical alignment layer and applying a liquid crystal medium to said optical alignment layer, is described. The invention also is directed to liquid crystal display elements made by the process of the invention and to novel polyimide compositions that are useful as optical alignment layers in the invention.
本发明涉及一种用于诱导液晶介质对准预倾斜的方法,包括将至少一个光学对准层暴露于偏振光中,该光学对准层包括各向异性吸收分子和疏水基团,所述偏振光的波长在所述各向异性吸收分子的吸收带内;其中,所暴露的各向异性吸收分子使液晶介质相对于入射光束的偏振方向,在光学对准层表面上形成一个角度+和-θ,并在光学对准层表面上形成一个预倾斜角度Φ,然后将液晶介质应用于所述光学对准层。本发明还涉及由本发明方法制备的液晶显示元件,以及用作本发明中光学对准层的新型聚酰亚胺组合物。