Abstract
AbstractMechanical drawing is widely used to induce the optical birefringence (positive A or negative C plates) in optically isotropic polymer films. We propose a method to make the optical films having the optical biaxiality lying in between that of the positive C and the negative A plates (nx < ny < nz) utilizing the solvent evaporation and the mechanical drawing processes. A theoretical model is proposed to calculate the birefringence induced by the processes. Numerical calculation shows that the biaxial film drawn properly can widen the viewing angle of IPS mode LCDs.
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