Claims
- 1. 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 which comprise compounds selected from formula IIa1 and simultaneously compounds selected from formulae IIa to IIf: ##STR16## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- Y is H or F,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.3, 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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa1 and IIa to IIf wherein X denotes nitrile, contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine and contains at least one compound of formula IIa, wherein X is F, Cl, --CF.sub.3, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5.
- 2. 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 which comprise one or more compounds of formula IIa1 and simultaneously one or more compounds, not of formula IIa1, selected from formulae IIa to IIf: ##STR17## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- Y is H or F,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa1 and IIa to IIf wherein X denotes nitrile, contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine and contains at least one compound of formula IIa, wherein X is F, Cl, --CF.sub.3, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5.
- 3. 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 which comprise compounds selected from formula IIa1 and simultaneously compounds selected from formulae IIa to IIf: ##STR18## and contains compounds of formulae IIa1, wherein X is F, Cl, --CF.sub.3, --OCF.sub.3, or --OCHF.sub.2
- R is n-alkyl or n-alkenyl of up to 9 carbon atoms
- Y is H or F,
- 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 nematic phase range of at least 60.degree. C., a maximum viscosity at 20.degree. C. of 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa1 and IIa to IIf wherein X denotes nitrile, contains compounds of the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine and contains at least one compound of formula IIa, wherein X is F, Cl, --CF.sub.3, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5.
- 4. 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 which include compounds selected from formulae IIa and IIb, compounds of formula IIc1 and compounds of formula IIc3: ##STR19## and, optionally, compounds not of formulae IIc1 or IIc3 selected from formulae IIc-IIf: ##STR20## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- Y and Z are each, independently of one another, H or F,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa-IIf, wherein X denotes nitrile, and contains compounds selected from the formulae IIc1 and IIc3 where 1 or 2 of Z and Y are fluorine.
- 5. A matrix liquid crystal display as in claim 4, wherein component B additionally comprises compounds selected from formulae IIc-IIf.
- 6. 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 which include compounds selected from formulae IIb1 and simultaneously compounds selected from formulae IIa, IIc, IIe, and IIf: ##STR21## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- Y is H or F,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIb1, IIa, IIc, IIe, and IIf, wherein X denotes nitrile and contains compounds selected from compounds of the formulae IIc, IIe, and IIf, where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine.
- 7. A matrix liquid-crystal display according to claim 6, wherein the component B compounds additionally contain compounds of formulae IIb or IId ##STR22##
- 8. 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 which include compounds selected from formula IIa2and simultaneously compounds not of formula IIa2selected from formulae IIa to IIf: ##STR23## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- Y is H or F,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa2to IIf wherein X denotes nitrile, contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine and contains compounds of formula IIa, wherein X is F, Cl, --CF.sub.3, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5.
- 9. 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 which include compounds selected from formulae IIa and IIb and simultaneously compounds selected from formulae IIc to IIf: ##STR24## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- X is CF.sub.3, Cl, CN, F, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.3, 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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of at least one compound selected from formulae IIa to IIf wherein X denotes nitrile and contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine and contains at least one compound selected from formula IIa and IIb, wherein X is F, Cl, --CF.sub.3, OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5.
- 10. A display according to claim 9, characterized in that component B contains compounds which conform to the formulae IIa to IIf and are selected from the following group of compounds: ##STR25## wherein R is in each case n-alkyl or n-alkenyl of up to 9 carbon atoms, Y and Z are each, independently of one another, H or F and X is F, Cl, --CF.sub.3, --OCF.sub.3 or --OCHF.sub.2.
- 11. A display according to claim 9, wherein the maximum viscosity of the liquid-crystal mixture at 20.degree. C. is 20 mpa.s.
- 12. 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 which include compounds selected from formulae IIa and IIb and simultaneously compounds selected from formulae IIc to IIf: ##STR26## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- X is --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
- component B does not contain any compounds of the formulae IIa to IIf in which
- X is cyano 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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, and contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine.
- 13. A display according to claim 12, characterized in that component B does not contain any compounds which have a terminal nitrile.
- 14. 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 which include compounds selected from formulae IIa and IIb and simultaneously compounds selected from formulae IIc to IIf: ##STR27## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- X is --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa to IIf wherein X denotes nitrile, contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine, and contains compounds which conform to the formulae IIa to IIf wherein A.sup.2 -X and A.sup.3 -X are selected from the group of the formulae (a) to (h): ##STR28##
- 15. 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 which include compounds selected from formulae IIa and IIb and simultaneously compounds selected from formulae IIc to IIf. ##STR29## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- X is --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa to IIf wherein X denotes nitrile, contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine, and contains compounds which conform to the formulae IIa to IIf and are selected from the following group of compounds: ##STR30## wherein R is in each case n-alkyl or n-alkenyl of up to 9 carbon atoms, Y is F and X is F, Cl, --CF.sub.3, --OCF.sub.3 or --OCHF.sub.2.
- 16. 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 which include compounds selected from formulae IIa and IIb, compounds of formula IIc1 and compounds of formulae IIc3: ##STR31## and, optionally, compounds not of formulae IIc1 or IIc3 selected from formulae IIc-IIf: ##STR32## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- Y and Z are each, independently of one another, H or F,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa-IIf, wherein X denotes nitrile, and contains compounds selected from the formulae IIc1 and IIc3 where 1 or 2 of Z and Y are fluorine, and
- contains compounds which conform to the formulae IIa and IIf and are selected from the following group of compounds: ##STR33## wherein R is in each case n-alkyl or n-alkenyl of up to 9 carbon atoms, Y and Z are each, independently of one another, H or F and X is F, Cl, --CF.sub.3, --OCF.sub.3 or --OCHF.sub.2.
- 17. 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 component B 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 which include compounds of the formula IIc1 and simultaneously compounds of the formula IIc3 ##STR34## and, optionally, compounds not of formulae IIc1 or IIc3 selected from formulae IIa to IIf: ##STR35## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- Y and Z are each, independently of one another, H or F,
- X is cyano, --NCS, F, Cl, --CF.sub.3, --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 30 mPa.s and a mean dielectricity constant .epsilon.<8, contains <20% of compounds of formulae IIa-IIf and IIc1 and IIc3 wherein X denotes nitrile, contains at least one compound selected from the formula IIc1 and/or IIc3 where at least one of the substituents X denotes fluorine and additionally contains compounds of formula IIa and IIb, wherein X is F, Cl, --CF.sub.3, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H and --OC.sub.2 F.sub.5.
- 18. 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 which include compounds selected from formulae IIa and IIb and simultaneously compounds selected from formulae IIc to IIf: ##STR36## in which R is n-alkyl or n-alkenyl of up to 9 carbon atoms,
- X is --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 30 mPa.s and a mean dielectricity constant .epsilon..ltoreq.8, contains .ltoreq.20% of compounds of formulae IIa to IIf wherein X denotes nitrile, contains compounds selected from the formulae IIc to IIf where A.sup.3 is 1,4-phenylene which is mono- or disubstituted by fluorine and contains compounds which conform to the formulae IIc to IIf in which A.sup.3 -X is ##STR37## where X is CF.sub.3, --OCF.sub.3, --OCHF.sub.2 or Cl.
Priority Claims (3)
| Number |
Date |
Country |
Kind |
| 38 35 730.5 |
Oct 1988 |
DEX |
|
| 39 08 403.5 |
Mar 1989 |
DEX |
|
| 39 23 044.9 |
Jul 1989 |
DEX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/818,208, filed Jan. 8, 1992, abandoned which is a divisional of application Ser. No. 07/458,695, filed Jan. 5, 1990, U.S. Pat. No. 5,122,295.
US Referenced Citations (3)
| Number |
Name |
Date |
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|
5171469 |
Hittich et al. |
Dec 1992 |
|
|
5286410 |
Weber et al. |
Feb 1994 |
|
|
5288427 |
Weber et al. |
Feb 1994 |
|
Divisions (1)
|
Number |
Date |
Country |
| Parent |
458695 |
Jan 1990 |
|
Continuations (1)
|
Number |
Date |
Country |
| Parent |
818208 |
Jan 1992 |
|
Patent Grant
5519525
