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US 7,482,044 B2Granted
Liquid crystalline medium and liquid crystal display
AssigneeMerck Patent GmbH
InventorsMarkus Czanta, Melanie Klasen-Memmer, Lars Lietzau
Life of this patent
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Abstract
Disclosed are compounds of formula I and dielectrically positive liquid crystalline media comprising a dielectrically positive component, component A, comprising a dielectrically positive compound of formula I, and optionally a second dielectrically positive component, component B, comprising one or more dielectrically positive compounds having a dielectric anisotropy of more than 3, and optionally a dielectric neutral component, component C, as well as to liquid crystal displays comprising these media, especially to active matrix displays and in particular to TN and to IPS displays.
Claims20
A liquid crystal medium comprising
- a first dielectrically positive component, component A, which comprises one or more dielectrically positive compounds of formula I
- wherein
- R1 is alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with 1 to 7 C-atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl with 2 to 7 C-atoms,
- X1 is halogen, halogenated alkyl or alkoxy with 1 to 6 C-atoms or halogenated alkenyl or alkenyloxy with 2 to 6 C-atoms,
- Y11 to Y14 are, independently of each other, H or F,
- Z11 to Z13 are, independently of each other, —CH2CH2—, —CF2CF2—, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH2O—, —O CH2—, —CF2O—, —O CF2— or a single bond, and
- n is 0 or 1
- and
- optionally, a second dielectrically positive component, component B, which comprises one or more dielectrically positive compounds having a dielectric anisotropy of more than 3, from which compounds of formula I are excluded,
- and
- optionally a dielectrically neutral component, component C, which comprises one or more dielectrically neutral compounds of formula IV
- wherein
- R41 and R42 are, independently of each other, alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with 1 to 7 C-atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl with 2 to 7 C-atoms,
- p is 0, 1 or 2,
- are, independently of each other, and in case
- is present twice, also these, independently of each other,
- Z41 and Z42 are, independently of each other, and in case Z41 is present twice, also these independently of each other, —CH2CH2—, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH2O—, —CF2O— or a single bond.
14 more elements
A liquid crystal medium comprising
- a first dielectrically positive component, component A, which comprises one or more compounds of formulae I-1, I-2, I-3, I-4, I-5, I-6, I-7, I-8 or I-9
- wherein
- R1 is alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with 1 to 7 C-atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl with 2 to 7 C-atoms,
- X1 is halogen, halogenated alkyl or alkoxy with 1 to 6 C-atoms or halogenated alkenyl or alkenyloxy with 2 to 6 C-atoms, and
- Z13 is —CH2CH2—, —CF2CF2—, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH2O—, —O CH2—, —CF2O—, —O CF2— or a single bond,
- and
- optionally, a second dielectrically positive component, component B, which comprises one or more dielectrically positive compounds having a dielectric anisotropy of more than 3, from which compounds of formula I are excluded,
- and
- optionally a dielectrically neutral component, component C, which comprises one or more dielectrically neutral compounds of formula IV
- wherein
- R41 and R42 are, independently of each other, alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with 1 to 7 C-atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl with 2 to 7 C-atoms,
- p is 0, 1 or 2,
- are, independently of each other, and in case
- is present twice, also these, independently of each other,
- Z41 and Z42 are, independently of each other, and in case Z41 is present twice, also these independently of each other, —CH2CH2—, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH2O—, —CF2O— or a single bond.
12 more elements
A compound of formula I
- wherein
- R1 is alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with 1 to 7 C-atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl with 2 to 7 C-atoms,
- X1 is halogen, halogenated alkyl or alkoxy with 1 to 6 C-atoms or halogenated alkenyl or alkenyloxy with 2 to 6 C-atoms,
- Y11 to Y14 are, independently of each other, H or F,
- Z11 to Z13 are, independently of each other, —CH2CH2—, —CF2CF2—, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH2O—, —O CH2—, —CF2O—, —O CF2— or a single bond, and
- n is 0 or 1.
3 more elements
Dependencies are inferred from the claim text.