Optical field enlargement film having a substituent to increase the birefringence of the liquid crystal display

摘要

An aromatic ring substituted with a substituent (BES) to increase the birefringence, and the optical field expansion film having anisotropy subunit (OASU) having a high positive birefringence throughout the wavelength range 400 nm lambda 800 nm (positive C-plate) is provided. The optical field expansion film can be processed by solution casting, stretching, photopolymerization, or without the need for further processing to provide a polymer film having a high birefringence. Such optical field expansion film in LCD, it is particularly suitable for use as a positive C-plate in a IPS-LCD.