Patent Number: 6,166,798

Title: TN cell having improved display of grey shades

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.

Inventors: Plach; Herbert (Darmstadt, DE), Breddels; Paulus Adrianus (Seoul, KR)

Assignee: Merck KGaA

International Classification: C09K 19/02 (20060101); G02F 1/13 (20060101); G02F 1/139 (20060101); C09K 019/02 ()

Expiration Date: 12/26/2017