Abstract
An aqueous solution of disodium cromoglycate (cromolyn) is known to form the chromonic N phase (i.e. a nematic lyotropic columnar phase) at room temperature and concentration range 13–17%, and the corresponding N∗ twisted nematic phase if chiral dopants are added. We have produced lyotropic liquid crystal films and cells with a uniform planar alignment and cells with twisted optic axis using L amino acids as chiral dopants. The optical retardation of the lyotropic twisted nematic (TN) cells was chosen to match that of active TN cells in the normally black (NB) TN device. When two cells are placed together between crossed polarizers, the birefringence effects cancel for all viewing directions, thus providing achromatic dark state, high head-on contrast, and a wide viewing cone.
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