Patent ID: 9376619
Filing Date: 2016-06-28
CPC Classification: B32B,C09K,G02F

Claim Text:
1. A surface-polymer-assisted vertically aligned (SPA-VA) liquid crystal cell, comprising: at least two substrates spaced apart from each other, each having an inner surface; an electrode material deposited on each said substrate inner surface; a coating comprising polyimide coated on said electrode material; said SPA-VA liquid crystal cell comprising a mixture of a polymer and a negative dielectric anisotropy liquid crystal consisting essentially of a nematic liquid crystal; said polymer formed insitu on each said polyimide inner surface and does not penetrate into the bulk of the cell, said polymer forming nanospikes or nanorods that are located on said polyimide inner surface, said nanospikes or nanorods having a diameter of from about 50 to about 1,000 nm and a height of from about 50 to about 1,000 nm; said polymer derived from a polymerized mixture of a monofunctional monomer having a long side chain that is either a linear or branched hydrocarbon that may be perfluorinated having from 5 to 20 carbon atoms, and a multifunctional reactive monomer; said polymer polymerized with no voltage applied by exposure to low intensity ultraviolet light of from 0.05 to 2 mW/cm wherein the SPA-VA liquid crystal cell is made from a mixture comprising from about 0.2 to about 5% of said monofunctional and multifunctional reactive monomers, from about 0.005 to about 2% of a photoinitiator, and the remainder of 100% of said liquid crystal, based on the total weight of said monofunctional and said multifunctional reactive monomers, said photoinitiator and said liquid crystal, and wherein said multifunctional reactive monomer has the formula: