Method for treating the surface of an ionic amorphous material to control the orientation of liquid crystals, method for manufacturing multi-domain alignment liquid crystal cells

A method for treating a first surface of an ionic amorphous material comprising:

• arranging said first surface of the ionic amorphous material in contact with or near at least one first electrode structured geometrically;
• applying a temperature to said ionic amorphous material from a heat source on a first area of said ionic amorphous material;
• applying a voltage at terminals of the first electrode of a predefined value for a given period;
• generating a plasma at the first surface of the ionic amorphous material from the ionization of a gas located between said first surface of ionic amorphous material and different portions of the first electrode and the application of a given voltage at the terminals of the first electrode, said application of the voltage at the terminals of the first electrode and said generation of plasma being configured so as to modify surface electrical properties of said ionic amorphous material to define at least one area of the surface locally polarized between the different portions of the first electrode;
• extracting the treated ionic amorphous material, polarized ionic amorphous material being used to define a liquid crystal cell.