Claims
- 1. A ferroelectric active- matrix liquid-crystal display containing a ferroelectric liquid crystal containing one or more mesogenic compounds having a partially or perfluorinated side chain of the formula (I)R(—A1—M1)a(—A2—M2)b—(—A3—M3)c—A4—B—Rf (I) where the symbols and indices are defined as follows:R is a) hydrogen, —F, —Cl, —CF3, —OCF3 or —CN, b) a straight-chain or branched alkyl radical (with or without an asymmetrical carbon atom) having 1 to 20 carbon atoms, where b1) one or more non-adjacent and non-terminal CH2— groups may be replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— or —Si(CH3)2—, and/or b2) one or more CH2— groups may be replaced by —CH═CH—, —C≡C—, cyclopropane-1,2-diyl, 1,4-phenylene, 1,4-cyclo-hexylene or 1,3-cyclopentylene, and/or b3) one or more H atoms may be replaced by F, CN and/or Cl, and/or b4) the terminal CH3 group may be replaced by one of the following chiral groups (optically active or racemic): c) B-Rf R3, R4, R5, R6 and R7 are identical of different and are a) hydrogen b) a straight-chain or branched alkyl radical (with or without an asymmetrucal carbon atom) having 1 to 16 carbon atoms, where b1) one or more non-adjacent and non-terminal CH2— groups may be replaced by —O—, and/or b2) one or two CH2— groups may be replaced by —CH═CH—, c) R4 and R5 together may alternatively be —CH2)4— or —(CH2) 5— if they are bonded to an oxirane, dioxolane, tetrahydrofuran, tetrahydropyran, butyrolactone or valerolactone system; Rf a straight-chain or branched, partially or perfluorinated alkyl radical (with or without an asymmetrical carbon atom) having 1 to 20 carbon atoms, where a) one or more non-adjacent and non-terminal CH2— or CF2— groups may be replaed by —O—, —S—, —CO—,—CO—O—, —O—CO—, —O—CO—O— or —Si(CH3)2—, and/or b) one or more CH2— or CF2— groups may be replaced by —CH═CH—, —C≡C—, cyclopropane-1,2-diyl, 1,4-phenylene, 1,4-cyclohexylene or 1,3-cyclopropane; B is —O—, —S—, —(CH2)n+1—O—, —O—(CH2)n+1—, —(CH2)n+1—S—, —S—(CH2)n+1—, -CO-(CH2)n—, —CS—O—(CH2)n—, —O—CS—(CH2)n—, —SO2—(CH2)n—, —OSO2—(CH2)n—, —CH═CH—, —C≡C—, —(CH2)n+1—, —CH═N—, —N(CkH2k+1)—, —(CH2)n—N(CkH2k+1)—CO—, —(CH2)n—N(CkH2k+1)—SO2—, —O—[(CH2)m+1—O]|—(CH2)n—, —[(CH2)m+1—O ]|—(CH2)n— or a single bond; m and n are identical or different and are, independently of one another, an integer from 0 to 15, k is an integer from 0 to 4, and I is an integer from 1 to 6, with the proviso that m+n≦15; M1, M2 and M3 are identical or different and are —CO—O—, —O—CO—, —CO—S—, —S—CO—, —CS—O—, —O—CS—, —CS—S—, —S—CS—, —CH2—O—, —O—CH2—, —CH2—S—, —S—CH2—; —CH2—CH2—, —CH═CH—, —C≡C—, —CH2—CH2—CO—O—, —O—CO—CH2—CH2—, —CH═N—or a single bond; A1, A2, A3 and A4 are identical or different and are 1,4-phenylene, in which one or more H atoms may be replaced by F, Cl, CH3, C2H5, OCH3, CF3, OCF3 and/or CN, 1,3-phenylene, in which one or two CH groups may be replaced by N, pyrazine-2,5-diyl, in which one or two H atoms may be replaced by F, Cl and/or CN, pyridazine-3,6-diyl, in which one or two H atoms may be replaced by F, Cl and/or CN, pyridine-2,5-diyl, in which one or more H atoms may be replaced by F, Cl and/or CN, pyrimidine-2,5-diyl, in which one or two H atoms may be replaced by F, Cl and/or CN, 1,4-cyclohexylene, in which one or two H atoms may be replaced by CN and/or CH3 and/or F, 1,3,4-thiadiazole-2,5-diyl, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl, 1,3-thiazole-2,4-diyl, in which one H atom may be replaced by F, Cl and/or CN, 1,3-thiazole-2,5-diyl, in which one H atom may be replaced by F, Cl and/or CN, thiophene-2,4-diyl, in which one H atom may be replaced by F, Cl and/or CN, thiophene-2,5-diyl, in which one or two H atoms may be replaced by F, Cl and/or CN, naphthaene 2,6-diyl, naphthalene-1,4-diyl or naphthalene-1,5-diyl, in each of which one or more H atoms may be replaced by F, Cl and/or CN and/or one or two CH groups may be replaced by N, phenanthrene-2,7-diyl or 9,10-dihydrophenanthrene-2,7-diyl, in each of which one, two or more H atoms may be replaced by F and/or one or two CH groups may be replaced by N, indane-2,5-diyl, indan-1-one-2,5-diyl, benzothiazole-2,6-diyl, benzothiazole-2,5-diyl, benzoxazole-2,6-diyl, benzoxazole-2,5-diyl, benzofuran-2,5-diyl, benzofuran-2,6-diyl, 2,3-dihydrobenzofuran-2,5-diyl, piperazine-1,4-diyl, piperazine-2,5-diyl, 1- alkyl-1-silacyclohexylene-1,4-diyl or 1,3-dioxaborinane-2,5-diyl; a, b and c are zero or one, with the proviso that the compound of the formula (I) cannot contain more than four five- or multimembered ring systems.
- 2. A ferroelectric active matrix display according to claim 1, wherein the display has electrodes spaced at least 1.5 μm and which can be switched at voltages of less or equal 30 v.
- 3. A ferroelectric active matrix display according to claim 1, wherein a liquid crystal mixture of 3 to 30 components is employed of which 3 to 25 components are compounds of the formula (I).
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 197 32 381 |
Jul 1997 |
DE |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is an application filed pursuant to 35 USC § 371 from PCT application PCT/EP98/04548, filed on Jul. 21, 1998, which in turn claims priority to German application 197 32 381.2, filed Jul. 25, 1997.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
PCT Information
| Filing Document |
Filing Date |
Country |
Kind |
| PCT/EP98/04548 |
|
WO |
00 |
| Publishing Document |
Publishing Date |
Country |
Kind |
| WO99/05238 |
2/4/1999 |
WO |
A |
US Referenced Citations (1)
| Number |
Name |
Date |
Kind |
|
5767924 |
Hiroki et al. |
Jun 1998 |
A |
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| Number |
Date |
Country |
| 0032362 |
Jul 1981 |
EP |
| 0592092 |
Apr 1994 |
EP |
| 0694599 |
Jan 1996 |
EP |
| 0717305 |
Jun 1996 |
EP |
| 9615092 |
May 1996 |
WO |
| 9712355 |
Apr 1997 |
WO |
Non-Patent Literature Citations (1)
| Entry |
| CAPLUS 1992: 71952. |
Patent Grant
6368679
