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US5122295A
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Matrix liquid crystal display
Assignee: Merck Patent GmbH
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Filing: 1989-10-17
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Granted: 1992-06-16
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Expires: 2009-10-17
Abstract
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.
Inventors
- 👤 Georg Weber
- 👤 Ludwig Pohl
- 👤 Reinhard Hittich
- 👤 Herbert Plach
- 👤 Bernhard Scheuble
- 👤 Takamasa Oyama
- 👤 Bernhard Rieger
- 👤 Hans Kurmeier
- 👤 Ekkehard Bartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:27
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/02; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003; C09K2019/3027
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
223 words
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 3 , --CHF 2 , --OCF 3 , --OCHF 2 , --OCF 2 CF 2 H or --OC 2 F 5 , and the rings A 1 , A 2 and A 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° C., a maximum viscosity at 20° C. of 20 mPa.s, a mean dielectricity constant ε≦8 and contains ≦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 3 , --OCHF 2 , --OCF 2 CF 2 H or --OC 2 F 5 .
Claim 2
Dependent Claim
223 words
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 3 , --CHF 2 , --OCF 3 , --OCHF 2 , --OCF 2 CF 2 H or --OC 2 F 5 , and the rings A 1 , A 2 and A 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° C., a maximum viscosity at 20° C. of 20 mPa.s, a mean dielectricity constant ε≦8 and contains ≦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 3 , --OCHF 2 , --OCF 2 CF 2 H or --OC 2 F 5 .
Claim 3
Dependent Claim
24 words
Display according to claim 1 characterized in that X is F, Cl, CF 3 , --OCF 3 , --OCHF 2 or --CHF 2 .
Claim 4
Dependent Claim
20 words
Display according to claim 1, characterized in that component B does not contain any compounds which have a terminal nitrile.
Claim 5
Dependent Claim
20 words
A display according to claim 1, wherein the maximum viscosity of the liquid-crystal mixture at 20° C. is 20 mPa.s.
Claim 6
Dependent Claim
36 words
A display according to claim 1, characterized in that component B contains compounds which conform to the formulae IIa to IIf wherein the rings A 1 , A 2 and A 3 are trans-1,4-cyclohexylene or 1,4-phenylene.
Claim 7
Dependent Claim
38 words
A display according to claim 1, characterized in that component B contains compounds which conform to the formulae IIa to IIf wherein the ring bound to X is 1,4-phenylene which is unsubstituted or mono- or disubstituted by fluorine.
Claim 8
Dependent Claim
41 words
A display according to claim 1, characterized in that component B contains compounds which conform to the formulae IIa to IIf wherein A 2 -X and A 3 -X are selected from the group of the formulae (a) to (h): ##STR17##
Claim 9
Dependent Claim
72 words
A display according to claim 1, characterized in that component B contains compounds which conform to the formulae IIa to IIf and are selected from the following group of compounds: ##STR18## 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 3 --, --OCF 3 or --OCHF 2 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |