OPTICAL FILTER AND THE METHOD OF PREPARING THE SAME

摘要

This invention provides an optical filter comprises of a pair of solid polymer films, wherein (1) a first solid polymer film has a planar alignment of a cholesteric liquid crystal structure of either clockwise or counterclockwise helical structure, which alignment allows the light of a specified wavelength to be scattered selectively, and (2) a second solid polymer film has a planar alignment of a cholesteric liquid crystal structure of a helical structure whose helical direction is the opposite to that of the first solid polymer film, which alignment allows the light at the specified wavelength to be scattered selectively, wherein the optical axes of the first and second solid polymer films are made substantially parallel to each other. This invention also provides preparation methods of an optical filter mentioned above.