Abstract
We propose a novel measurement method for determining cell parameters,
such as a cell thickness and twist angle in reflective liquid crystal (LC)
cells, by using a unique polarization-converting device prepared with a circularly
and homogeneously aligned LC (CH-LC) cell. The light intensity distributions
from the reflective LC cell transmitted twice through the CH-LC cell are measured
by a charge-coupled device array camera. Cell thickness can be derived by
using coordinate values of local minimum spot in the spatial light intensity
distribution measured at one wavelength, where the pretilt angle is assumed
to be the designed value. Both cell thickness and twist angle can also be
determined by two local minimum positions of the light intensity at two different
wavelengths and the effects of a quarter-wave plate are discussed.
© 2007 IEEE
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