TN cell having improved display of grey shades

Details TN cell having improved display of grey shades TN cell having improved display of grey shades

1998-04-07

2000-12-26

Sikes, William L.

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Within nematic phase

349180, C09K 1902

Patent

active

061667986

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.

REFERENCES:
patent: 5696570 (1997-12-01), Plach et al.

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