Holding plate for liquid crystal

Claim 1

A holding plate for a liquid cyrstal which is adapted to arrange the molecules of the liquid crystal in a substantially horizontal, homogeneous orientation, said holding plate having an electrode provided on the side thereof which contacts the liquid crystal, said holding plate being coated with a film consisting of a silane compound formed by the application of an aqueous solution of a precursor compound of the formula: ##STR4## wherein R 1 , R 2 , and R 3 are each CH 3 --, CH 3 O--, C 2 H 5 O--, C 3 H 7 O--, or halogen but at least one of them is CH 3 --, CH 3 O--, or C 2 H 5 O--, Alk is --CH 2 CH 2 --, --CH 2 CH 2 CH 2 --, --CH 2 CH 2 CH 2 CH 2 --, or --CH 2 CH 2 CH 2 CH 2 CH 2 --, and X is the residue of a polyamine group consisting of --NH(CH 2 ) 2 NHCH 2 COOCH 3 , --NH(CH 2 ) 2 --NHCH 2 COOC 2 H 5 --NH(CH 2 ) 3 NHCH 2 COOCH 3 , --NH(CH 2 ) 3 NHCH 2 CH 2 COOCH 3 , --NH(CH 2 ) 2 NHCH 2 CH 2 COOCH 3 , --NH(CH 2 ) 3 NHCH 2 CH 2 COOC 2 H 5 , --NH(CH 2 ) 2 NHCH 2 CH 2 CH 2 COOC 2 H 5 , --NH(CH 2 CH 2 NH) 2 H, or --NH(CH 2 CH 2 CH 2 NH) 2 H, wherein the precursor compound is dissolved into water to make a concentration of 0.001 to 0.1% by weight, said silane compound being disposed between the electrode and the liquid crystal, the film consisting of the silane compound being provided on the electrode by dipping the holding plate in the aqueous solution, drying the same, and subjecting the holding plate to rubbing to orient the molecular arrangement of the liquid crystal in one direction.