|
1. An optical film comprising a plurality of polymeric layers, the plurality of polymeric layers having an average optical transmittance of at least 80% of normally incident light having a first polarization state in a predetermined wavelength range extending at least from 450 to 600 nm and an average optical reflectance of at least 95% of normally incident light having an orthogonal second polarization state in the predetermined wavelength range, each polymeric layer of the plurality of polymeric layers having an average thickness less than about 200 nm, the plurality of polymeric layers comprising first and second polymeric layers as the two polymeric layers in the plurality of polymeric layers farthest apart from each other, the first and second polymeric layers having respective first and second thicknesses, a difference between the first and second thicknesses being less than about 10 nm.
|
