Patents Represented by Attorney, Agent or Law Firm Robert J. Ppechman
  • Polyimide angularity enhancement layer
    Patent number: 6383578
    Abstract: An angularity enhancement layer in a liquid crystal display, which display comprises a liquid crystal cell, wherein the angularity enhancement layer includes a negative birefringent polyimide layer comprising a plurality of structural units having pendant fluorene groups, said angularity enhancement layer being disposed on at least one surface of said liquid crystal cell. A liquid crystal display can comprise an angularity enhancement construction of the invention which comprises a polyimide layer.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: May 7, 2002
    Assignee: 3M Innovative Properties Co.
    Inventors: Stephen A. Ezzell, Hassan Sahouani, Ernest L. Thurber