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US 5,122,295 AGranted
Matrix liquid crystal display
AssigneeMerck Patent GmbH
InventorsGeorg Weber, Ludwig Pohl, Reinhard Hittich, Herbert Plach, Bernhard Scheuble, Takamasa Oyama, Bernhard Rieger, Hans Kurmeier, Ekkehard Bartmann
Life of this patent
Estimating the term…
Abstract
The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
Claims8
A matrix liquid-crystal display containing:
- two plane parallel support plates which together with a frame form a cell,
- integrated non-linear elements for switching individual picture elements on the support plates and
- a nematic liquid-crystal mixture of at least two liquid crystalline compounds which is present in the cell and has a positive dielectric anisotropy and high resistivity,
- wherein the liquid-crystal mixture consists essentially of liquid-crystalline component B compounds having a dielectric anisotropy of more than +1.5 and being of formulas IIa-IIf:
- ##STR16## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --CHF.sub.2, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5, and
- the rings A.sup.1, A.sup.2 and A.sup.3 are each independently of one another, 1,4-phenylene, 2- or 3-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, trans-1,4-cyclohexylene or 1,4-cyclohexenylene, and
- the nematic liquid-crystal mixture has a nematic phase range of at least 60.degree. C., a maximum viscosity at 20.degree. C. of 20 mPa.s, a mean dielectricity constant .epsilon..ltoreq.8 and contains .ltoreq.20% of compounds of formulae IIa to IIf wherein X denotes nitrile and contains compounds which conform to the formulae IIa to IIf where X is --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5.
5 more elements
Dependencies are inferred from the claim text.