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US 9,434,882 B2Granted
Liquid-crystalline medium and electro-optical display
AssigneeMerck Patent GmbH
InventorsMark Goebel, Atsutaka Manabe, Elvira Montenegro, Detlef Pauluth
Life of this patent
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Abstract
The invention relates to a liquid-crystalline medium having a nematic phase and negative dielectric anisotropy which comprises a) a compound of the formula (I), b) one or more compounds of the formula (II) and c) one or more compounds selected from the group of the compounds of the formulae (III-1) to (III-4. The liquid-crystalline medium is useful in an electro-optical display, particularly in an active-matrix display based on the VA, ECB, PALC, FFS or IPS effect.
Claims28
A liquid-crystalline-medium having a nematic phase and negative dielectric anisotropy which comprises
- a) a compound of the formula I
- and
- b) one or more compounds of the formula II
- in which
- R21 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkenyl radical having 2 to 7 C atoms, and
- R22 denotes an unsubstituted alkenyl radical having 2 to 7 C atoms, wherein said formula II includes 37% or more of a compound of formula CC-n-V
- in which n is 3 or,
- wherein the total concentration of the compounds of the formula CC-n-V, in the medium as a whole is 37% to 44%
- and
- c) one or more compounds of the formula III-1 to III-4
- in which
- R31 denotes an unsubstituted alkyl radical having 1 to 7 C atoms,
- R32 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkoxy radical having 1 to 6 C atoms, and
- m, n and o each, independently of one another, denote 0 or 1 and
- wherein at least one of said compounds is a compound of formula III-2.
12 more elements
Dependencies are inferred from the claim text.