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A filled twisted nematic liquid crystal cell thickness measurement method which make use of retardation measurement is disclosed.
English (United States)
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Liquid Crystal Cell Thickness Measurement
A filled twisted nematic liquid crystal cell thickness measurement method
which make use of retardation measurement is disclosed.
The retardation is expressed as ((n(e)-n(o)*d, where n(e) and n(o) are
refractive indices for extraordinary and ordinary rays, respectively, and d is a
thickness of filled liquid crystal cell. Therefore, if we know birefringence (n(e)-n(o)
of the filled liquid crystal cell, we can obtain the cell thickness from its retardation.
Generally, birefringence is a function of pre-tilt angle, temperature and
wavelength. Unfortunately, in the case of twisted nematic liquid crystal cell, it is
also a function of cell thickness. The disclosed method solves this problem.
The measurement consists of two steps. Step 1: measure a retardation of a
standard filled twisted nematic liquid crystal cell, whose thickness is already
known and whose condition is almost the same as those of target liquid crystal
cells, and obtain the birefringence of standard cell by dividing the retardation by
the cell thickness. Step 2: measure retardations of target cells and obtain target
cell thickness by dividing retardation by birefringence which is obtained in Step 1.