[DE] VERBINDUNGEN UND VERFAHREN ZUR ERZEUGUNG VON ANISOTROPIE [EN] COMPOUNDS AND METHODS FOR PRODUCING ANISOTROPY [FR] COMPOSES ET PROCEDES DE PRODUCTION D'ANISOTROPIE
1,3-dioxane derivatives, methods of preparation and liquid crystal
申请人:Seiko Epson Corporation
公开号:US05238599A1
公开(公告)日:1993-08-24
Trans-2-phenyl-5-trans-4'-alkylcyclohexyl-1,3-dioxane derivatives represented by the general formula: ##STR1## wherein R is a linear alkyl group of 1 to 10 carbon atoms, A is a single covalent bond or a --CH.sub.2 CH.sub.2 -- group, X is F or CN, Y is F if X is CN or Y is H or F if X is F, and the cyclohexane ring and the 1,3-dioxane ring are trans isomers. The 1,3-dioxane derivatives have large positive dielectric constant anisotropy (.DELTA..epsilon.), small birefringence (.DELTA.n) and have good compatibility with other liquid crystal compounds. The dioxane derivatives may be included in liquid crystal compositions for improved display devices having a low threshold voltage, a low driving voltage and a wide visual angle.
Liquid-crystal displays and liquid-crystalline media having homeotropic alignment
申请人:MERCK PATENT GMBH
公开号:US20150301368A1
公开(公告)日:2015-10-22
The present invention relates to liquid-crystalline media (LC media) having negative or positive dielectric anisotropy comprising self-alignment additives (SAMs) with an at least one bifunctional or polyfunctional anchor group, which effects the homeotropic (vertical) alignment of the LC media at a surface or the cell walls of a liquid-crystal display (LC display). The invention therefore also encompasses LC displays having homeotropic alignment of the liquid-crystalline medium (LC medium) without conventional imide alignment layers. The LC media may be supplemented by a polymerizable or polymerized component, which serves for stabilisation of the alignment, for adjustment of the tilt angle and/or as passivation layer.
1,3-dioxane derivative and liquid crystal compositions containing it
申请人:Seiko Epson Corporation
公开号:US05354502A1
公开(公告)日:1994-10-11
A 1,3-dioxane derivative and a liquid crystal composition containing it as expressed by the general formula ##STR1## (where R is a straight chain alkyl group of carbon number 1 to 10, A is a single bond or --CH.sub.2 CH.sub.2 -- group, n is 0 or 1, and the cyclohexane ring and 1,3-dioxane ring are respectively in trans form is disclosed.) The 1,3-dioxane derivative represented by general formula (I) has a very large dielectric anisotropy and a small birefringence. Liquid crystal compositions containing (I) can be driven at low voltage and will provide a liquid crystal display apparatus with a wide visual angle.
1,3-dioxane derivative and liquid crystal composition incorporating the same
申请人:SEIKO EPSON CORPORATION
公开号:EP0400861A1
公开(公告)日:1990-12-05
A 1,3-dioxane derivative of the general formula:
wherein, R is a straight chain alkyl group of 1 to 10 carbon atoms, A is a single bond or a -CH2-CH2- group, X is F or CN, Y is either F when X is CN or H or F when X is F, and the cyclohexane ring and the 1,3-dioxane ring are each in the trans configuration.
通式如下的 1,3-二恶烷衍生物: 其中,R 为 1 至 10 个碳原子的直链烷基,A 为单键或-CH2-CH2-基团,X 为 F 或 CN,Y 为 F(当 X 为 CN 时)或 H 或 F(当 X 为 F 时),环己烷环和 1,3-二恶烷环各自为反式构型。