Liquid crystalline medium

Abstract

The invention relates to compounds of the formula I, to a liquid-crystalline medium which comprises at least one compound of the formula I, in which R1, R1*, L1, L2, L3 and L4 have the meanings indicated herein, and to the use thereof for an active-matrix display, in particular based on the VA, PSA, PS-VA, PM-VA, PALC, IPS, PS-IPS, SA-VA, SS-VA, FFS or PS-FFS effect.

Description

technical field [0001] The invention relates to liquid-crystalline media comprising at least one compound of the formula I, [0002] [0003] in [0004] R 1 and R 1* Each independently represents an alkyl or alkoxy group having 1-15 C atoms, and in addition, one or more CH in these groups 2 The groups can be each independently of each other by -C≡C-, -CF 2 O-, -OCF 2 -, -CH=CH-, -◇-, -◇◇-, -O-, -CO-O- or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and, additionally, one or Multiple H atoms can be replaced by halogen, [0005] L 1 to L 4 Each independently represents F, Cl, CF 3 or CHF 2 , where the group L 1 -L 4 One of them can also be H. Background technique [0006] In particular, such media can be used in electro-optic displays with active-matrix addressing based on the ECB effect, and in IPS (In-Plane Switching) displays or FFS (Fringe Field Switching) displays. [0007] The principle of electrically ...

AI Technical Summary

Problems solved by technology

At the same time, however, properties such as low temperature stability must not be compromised

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