公开(公告)号：EP0995184A1

公开(公告)日：2000-04-26

申请号：EP98941322.4

申请日：1998-07-13

申请人： Hoechst Research & Technology Deutschland GmbH & Co. KG

发明人： TAKEICHI, Ayako ,  HORNUNG, Barbara ,  DÜBAL, Hans-Rolf

IPC分类号： G09G3/36 ,  G02F1/141

CPC分类号： C09K19/3003 ,  C09K19/42 ,  C09K19/588 ,  G02F1/141 ,  G09G3/3629 ,  G09G2310/06

摘要： The invention relates to a ferroelectric liquid-crystal display containing a ferroelectric liquid-crystal mixture, characterized in that the display is controlled with voltage pulses ≥0.9 ms. The display provided for by the invention is especially suited for applications in which the length of switching time is not critical. Such displays can be switched with the same voltage in a very wide range of temperatures, thus making it unnecessary for the voltage to be adjusted in line with the temperature. Potential applications include displays in chip cards, electronic pricing or display signs (shelf labels), PDAs (personal digital assistants) and pagers.

公开(公告)号：EP0883618A1

公开(公告)日：1998-12-16

申请号：EP96944617.0

申请日：1996-12-20

申请人： Hoechst Research & Technology Deutschland GmbH & Co. KG

发明人： NONAKA, Toshiaki ,  LI, Ji ,  TAKEICHI, Ayako ,  HORNUNG, Barbara ,  MANERO, Javier ,  SCHMIDT, Wolfgang ,  WINGEN, Rainer

IPC分类号： G02F1 ,  C07D401 ,  C07D405 ,  C09K19

CPC分类号： C07D401/04 ,  C07D405/14 ,  C09K19/0225 ,  C09K19/3003 ,  C09K19/34 ,  C09K19/3466 ,  C09K19/42

摘要： The invention relates to difluorophenyl pyrimidyl pyridine derivatives of the formula (I), in which the symbols have the following meanings: X is N and Y is CH or X is CH and Y is N; R1, R2 are independently or both (a) an unbranched or branched alkyl chain with 1 to 20 atoms, in which (aa) one or a plurality of non-adjacent and non-terminal CH¿2?-groups can be replaced by -O-,-CO-O-, -O-CO-, -O-CO-O-, -Si(CH3)2-, and/or (ab) one or a plurality of H-atoms can be replaced by F, and/or (ac) the terminal CH3 group can be replaced by one of the chiral groups (1)-(7) (optically active or racemic); (b) hydrogen, wherein only one of the two radicals R?1, R2¿ may be H, provided that R1 may not be bonded to the pyridine ring by way of -CO-O- or -O-CO-O-; R?3, R4, R5¿ are independently or both hydrogen or a straight-chained or branched alkyl radical with 1-16 C-atoms (with or without an asymmetrical C-atom), in which one or a plurality of non-adjacent, non-terminal CH¿2?-groups can be replaced by -O-, and/ or one or a plurality of H-atoms of the alkyl radical can be substituted by -F; R?4 and R5¿ can also be -(CH¿2?)4- or-(CH2)5- together, when they are bound to a dioxolane system. Said derivatives are particularly suitable as constituents, in particular, for ferroelectric liquid crystal mixtures.

公开(公告)号：EP0839173A1

公开(公告)日：1998-05-06

申请号：EP96927038.0

申请日：1996-07-17

申请人： Hoechst Research & Technology Deutschland GmbH & Co. KG

发明人： NONAKA, Toshiaki ,  TAKEICHI, Ayako ,  LI, Ji ,  NAGAO, Kazuya ,  WINGEN, Rainer ,  MANERO, Javier ,  HORNUNG, Barbara ,  SCHMIDT, Wolfgang

IPC分类号： C07D401 ,  C07D405 ,  C09K19

CPC分类号： C07D401/04 ,  C07D405/14 ,  C09K19/0225 ,  C09K19/3003 ,  C09K19/34 ,  C09K19/3466 ,  C09K19/42

摘要： The object of the present invention is to provide a ferroelectric liquid crystal mixture having a negative value of Δε and allowing a high speed response and a low voltage driving, as well as a liquid crystal display device using the liquid crystal mixture of the invention. The ferroelectric liquid crystal mixture according to the invention comprises two or more compounds from at least two different of the following classes of compounds: A. thiadiazoles, B. phenanthrenes, C. 2-fluoropyridines, D. difluorobenzenes, E. meta-substituted aromatic compounds.