Abstract
We investisated the viewins angle characteristics of TN-LCD calculatins the polarization using Poincare sphere. We clarified (1) The reason for the difference between viewins angle characteristics for e-mode and o-mode is that the azimuth direction of the polarizers changes in oblique viewing. In upper-right, upper-left, lower-right, and lower-left viewing, as the polarizers' angle does not chanse, the viewing angle characteristic for e-mode and o-mode are the same. (2) The viewing angle characteristic in normally - white mode is symmetrical, but that in normally - black mode is asymmetrical. One reason is that the normally - white mode has rotation symmetry in alignment and polarizers but normally - black mode does not. Another reason is that the azimuth direction of polarizers deviates from the original position set for the normal direction or from the 90-270° line in the oblique viewing.
