Abstract

We propose an achromatic optical-compensation method using uniaxial films to eliminate the off-axis light leakage at the dark state in a homogeneously aligned liquid crystal cell. Three uniaxial films with different dispersion characteristics are used so that they can compensate each other to achieve achromatic effective phase retardation at off-axis. The retardation values are optimized with the aid of the Poincaré sphere and through numerical research. A contrast ratio of higher than $2000:1$ is predicted over the entire $\pm 60°$ viewing cone for a homogeneously aligned LC cell with zero pretilt angle.

© 2013 Optical Society of America

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