EP 1599562 B9 20080924 - NEMATIC LIQUID CRYSTAL MIXTURES FOR BISTABLE DISPLAY DEVICES
Title (en)
NEMATIC LIQUID CRYSTAL MIXTURES FOR BISTABLE DISPLAY DEVICES
Title (de)
NEMATISCHE FLÜSSIGKRISTALLMISCHUNGEN FÜR BISTABILE FLÜSSIGKRISTALLANZEIGEVORRICHTUNGEN
Title (fr)
MELANGES CRISTAUX LIQUIDES NEMATIQUES POUR DISPOSITIFS D'AFFICHAGE BISTABLES
Publication
Application
Priority
- FR 2004000435 W 20040226
- FR 0302332 A 20030226
Abstract (en)
[origin: FR2851568A1] Mixtures of nematic crystals for bistable displays with a low energy of anchorage. Nematic liquid crystal mixtures for bistable displays comprises: (a) at least 40 % wt. of compounds of high molecular polarisability(delta e greater than 10) and high dipole moment(psi greater than 1 D) but with a low zenithal anchorage of formulae (AI) - (AIV); (b) 0 - 60 % of compounds of low anchorage of formulae (BI), (BII), (EI), (EII), (FI) and (FII); (c) 0 - 25 % of compounds comprising dipoles, from compounds of formulae (CI) and (CII); (d) 0 - 10 % of a compound of formula (D); (a) [Image] R 1-CN, -NCS, -F or -CF 3; R 2R- or RCOO- (R is 1 - 12C alkyl); R 3R- or RCOO- (R = 1 - 12C alkyl or cycloaliphatic); Z 1, Z 2(identical or different) : -CC-, -CH 2CH 2-, -COO- -OOOC- or single bonds; X 1, X 2(identical or different) : F, Cl or H. [Image] R 4, R 5(identical or different) : R- or RCOO- (R is 1 - 12C alkyl or alkoxy, or 3 - 8C cycloaliphatic ); Z 1, Z 2(identical or different) : -CC-, -CH 2CH 2-, -COO-, -OOC- or sinlge bonds; X 1, X 2F, Cl or H; X 3, X 4H or Hal, or R- or RO- (R is 1 - 12C alkyl). [Image] [Image] R 1-CN, -NCS, -F or -CF 3; R 2R- or RCOO-(R = 1 - 12C). Z 1, Z 2(identical or different) : -CC-, -CH 2CH 2-. -COO-, -OOC- or single bonds; X-1, X 2(identical or different) : F, Cl or H. The mixtures have the following physical characteristics :- Nematic transition temperature-liquid isotrope (TN-1) greater or equal to +50 [deg] C ; Nematic level delta TN greater or equal to 50 [deg] C ; Positive dielectric anisotropy greater or equal to 8(20 [deg] C) ; Low zenithal anchorage on at least one of the plates of the bistable display(characterized by a breakdown voltage, Ulambda /2 less than 25 volts, for a cell of thickness d such that ddelta n = 295 nm). Independent claims are also included for the bistable display apparatus comprising the liquid crystal mixture and use.
IPC 8 full level
C09K 19/42 (2006.01); G02F 1/13 (2006.01); C09K 19/12 (2006.01); C09K 19/30 (2006.01); C09K 19/44 (2006.01); C09K 19/46 (2006.01)
CPC (source: EP KR US)
C09K 19/12 (2013.01 - KR); C09K 19/30 (2013.01 - KR); C09K 19/42 (2013.01 - EP KR US); C09K 19/44 (2013.01 - EP KR US); C09K 19/46 (2013.01 - EP KR US); C09K 2323/00 (2020.08 - EP US); C09K 2323/03 (2020.08 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
FR 2851568 A1 20040827; FR 2851568 B1 20070525; AT E362502 T1 20070615; CN 100365096 C 20080130; CN 1753969 A 20060329; DE 602004006495 D1 20070628; DE 602004006495 T2 20080124; EP 1599562 A2 20051130; EP 1599562 B1 20070516; EP 1599562 B9 20080924; HK 1083634 A1 20060707; JP 2005133057 A 20050526; JP 5089851 B2 20121205; KR 101109895 B1 20120208; KR 20050113625 A 20051202; TW 200427821 A 20041216; TW I333973 B 20101201; US 2004188654 A1 20040930; US 2006249708 A1 20061109; US 7115307 B2 20061003; US 7335405 B2 20080226; WO 2004077390 A2 20040910; WO 2004077390 A3 20041007
DOCDB simple family (application)
FR 0302332 A 20030226; AT 04714813 T 20040226; CN 200480005392 A 20040226; DE 602004006495 T 20040226; EP 04714813 A 20040226; FR 2004000435 W 20040226; HK 06105762 A 20060518; JP 2004052207 A 20040226; KR 20057016000 A 20040226; TW 93104857 A 20040226; US 39750606 A 20060403; US 78819304 A 20040225