TN cell having improved display of grey shades
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United States of America Patent
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Dec 26, 2000
Issued Date -
N/A
app pub date -
Apr 7, 1998
filing date -
Apr 16, 1992
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Abstract
The invention relates to a TN cell which contains a nematic liquid crystal having positive dielectric anisotropy and a twist angle of essentially 90.degree., between two substrates provided with electrode and alignment layers, where the product of the separation between the substrate plates d and the optical anisotropy d.multidot..DELTA.n [sic] of the liquid crystal is between 0.15 and 0.70 .mu.m, characterised in that the liquid crystal contains a doping component in order to improve the grey shade capacity, so that the cell has a value for the undisturbed quotient of the separation between the substrate plates d and the pitch of the liquid crystal p of 0.1.ltoreq.d/p.ltoreq.0.5.
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