Method of manufacturing a liquid crystal device with plane alignment

Claim 1

A method of manufacturing a liquid crystal device of plane alignment type, comprising the following steps: A. the deposition upon two transparent substrates which exhibit two large faces, of a first layer of transparent, electrically conductive substance; B. the treatment of at least one of said substrates in an enclosure made of vitreous silica, the general shape of which is that of a cylinder with a horizontal axis, said enclosure comprising a mounting arrangement along a generatrix of the cylinder, and having a horizontal surface accomodating said substrate, located at half the height of the internal space, said enclosure being surrounded at its central portion by a heater resistor; said treatment comprising the following operations: a. by means of a tube supplied with a vapor of a liquid monomer selected in the group of methyl acrylate, methyl methacrylate, vinyl monomers, silanes, chlorosilanes and siloxanes, progressively replacing the air of said enclosure by said vapor; b. adjusting the vapor flow in the enclosure for avoiding turbulence and regulating heating to a predetermined temperature for obtaining a polymer deposit onto said substrate; c. the insertion of a liquid crystalline substance in the mesomorphous phase, between the two substrates in such a fashion that said polymer deposit is in contact with said crystalline substance.

Claim 2

A method of manufacturing a liquid crystal device of plane alignment type, comprising the following steps: A. the deposition upon two transparent substrates which exhibit two large faces, of a first layer of transparent, electrically conductive substance; B. the treatment of at least one of said substrates in an enclosure made of vitreous silica, the general shape of which is that of a cylinder with a horizontal axis, said enclosure comprising a mounting arrangement along a generatrix of the cylinder, and having a horizontal surface accomodating said substrate, located at half the height of the internal space, said enclosure being surrounded at its central portion by a heater resistor; said treatment comprising the following operations: a. by means of a tube supplied with a vapor of a liquid monomer selected in the group of methyl acrylate, methyl methacrylate, vinyl monomers, silanes, chlorosilanes and siloxanes, progressively replacing the air of said enclosure by said vapor; b. adjusting the vapor flow in the enclosure for avoiding turbulence and regulating heating to a predetermined temperature for obtaining a polymer deposit onto said substrate; c. the insertion of a liquid crystalline substance in the mesomorphous phase, between the two substrates in such a fashion that said polymer deposit is in contact with said crystalline substance.