摘要:
Novel compounds for use in ferroelectric smectic liquid crystal mixtures are provided, having a general formula: ##STR1## where R.sub.1 is alkyl, alkoxy, alkylcarbonyloxy or alkoxy-carbonyl, ##STR2## are cyclic groups, A and B are a single bond, COO, OOc, CH.sub.2 CH.sub.2, CH.sub.2 O or OCH.sub.2, (a+b+c) is 2 or 3 and R.sub.2 is an optically active alkyl group. Ferroelectric smectic liquid crystal mixtures containing these compounds, and a suitable ferroelectric liquid crystal device are also described.
摘要翻译:提供了用于铁电近晶液晶混合物的新型化合物,具有以下通式:其中R 1是烷基,烷氧基,烷基羰氧基或烷氧羰基,IMA是环基,A和B是单键,COO ,OOc,CH2CH2,CH2O或OCH2,(a + b + c)为2或3,R2为光学活性烷基。 还描述了含有这些化合物的铁电近晶液晶混合物和合适的铁电液晶装置。
摘要:
Biphenyl esters of formula (I), wherein formula (II) represents formula (III) or formula (IV), R.sub.1 represents C.sub.3 -C.sub.12 alkyl, alkoxy, alkylcarbonyloxy, alkoxycarbonyl or alkoxycarbonyloxy, j is 0 or 1, R.sub.2 represents C.sub.3 -C.sub.12 alkyl or alkoxy, one of Q.sub.1 or Q.sub.2 is fluorine and the other is hydrogen, provided that when j is 0 and formula (II) is formula (III) and both R.sub.1 and R.sub.2 are n-alkyl, then the total number of carbon atoms in R.sub.1 and R.sub.2 is more than 12. These compounds may be used as constituents of liquid crystal mixtures which show a room temperature ferroelectric smectic phase, and a number of such mixtures are described.
摘要:
Biphenyl egters of formula (I), ##STR1## wherein formula (II) represents formula (III) or formula (IV), R.sub.1 represents C.sub.3 -C.sub.12 alkyl, alkoxy, alkylcarbonyloxy, alkoxycarbonyl or alkoxycarbonyloxy, j is O or 1 R.sub.2 represents C.sub.3 -C.sub.12 alkyl or alkoxy, one of Q.sub.1 or Q.sub.2 is fluorine and the other is hydrogen, provided that when j is O and formula (II) is formula (III) and both R.sub.1 and R.sub.2 are n-alkyl, then the total number of carbon atoms in R.sub.1 and R.sub.2 is more than 12. These compounds may be used as constituents of liquid crystal mixtures which show a room temperature ferroelectric smectic phase, and a number of such mixtures are described.
摘要:
An integrated electro-optical device according to the invention comprises a pixellated liquid crystal modulation layer superimposed over an electronic detection layer. Modulator pads for the liquid crystal layer may be formed as electrically conductive combs to achieve optical polarization. Where the liquid crystal layer provides selective absorption of unpolarized light, and separate polarizers between the liquid crystal and detection layers are therefore unnecessary, the device comprises such a liquid crystal layer superimposed over the electronic detector layer. Further, an integrated electro-optical device, optionally of the above type, has a plurality of pixels of the liquid crystal layer for each pixel of the detector array. This allows optical shuttering of the detector pixels by electrically modulating the pixellated liquid crystal layer.
摘要:
Optically active compounds of formula (I), where X has a structure (II) and B is C.sub.1-12 alkyl, a chiral group or a group having a general structure (III), where R and R' are H, C.sub.1-12 alkyl, alkoxy, alkylcarbonyloxy, or alkoxycarbonyl, each ring (IV) and (V) is the same or different, A and D are single bonds or bridging groups, each a and d is 0 or 1; Z, Z' are CN, Cl, F, Br or CF.sub.3 ; provided when Z is CN or Cl, then when B is alkyl X-Y is not (VI) or (VII). Ferroelectric smectic liquid crystal mixtures containing these compounds are also described. ##STR1##
摘要:
A liquid crystal material which comprises a mixture of compounds includes at least one low viscosity additive compound of Formula (I) as follows:A--CH.sub.2.CH.sub.2 --B Formula (I)wherein A is selected from: ##STR1## and B is selected from: ##STR2##where R.sub.1 is selected from alkyl, alkoxy, alkylcarbonyloxy and alkoxycarbonyloxy; and R.sub.2 is alkyl; and where ##STR3## is a benzene ring; ##STR4## is a cyclohexane ring, which is in the trans-configuration if di-substituted; and ##STR5## is a bicyclo(2,2,2)octane ring.
摘要:
A phase change liquid crystal device comprising a layer of liquid crystal material contained between two transparent slides which carry electrode structures for applying a voltage across the layer. The liquid crystal material is a mixture of nematic and cholesteric material having a smectic to cholesteric transition just below the operating temperature range of the device. This provides a cholesteric pitch change to compensate for changes with temperature in the elastic twist and dielectric constants.
摘要:
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one anthraquinone compound free from water solubilizing and ionic substituents and having the formula: ##STR1## wherein P is OH or NH.sub.2 ; each group X.sup.A is independently selected from OH, NO.sub.2, SR and NZ.sub.1 Z.sub.2 provided that one group X.sup.A is SR and the other group X.sup.A is OH, NO.sub.2 or NZ.sub.1 Z.sub.2 is 1 or 2; each group Q.sub.1 is independently alkyl having from 1 to 20 carbon atoms; each group R is independently selected from alkyl having from 1 to 20 carbon atoms, aryl having up to 15 carbon atoms and cycloalkyl having from 4 to 8 carbon atoms.
摘要翻译:适用于客体主体液晶装置的材料包括液晶材料和多色染料的溶液,其中多色染料包含至少一种不含水溶解和离子取代基的蒽醌化合物,具有下式:其中P 是OH或NH 2; 只要一组XA为SR,另一组XA为OH,NO2或NZ1Z2为1或2,则各基团XA独立地选自OH,NO 2,SR和NZ 1 Z 2。 每个基团Q1独立地为具有1至20个碳原子的烷基; 每个基团R独立地选自具有1至20个碳原子的烷基,具有至多15个碳原子的芳基和具有4至8个碳原子的环烷基。
摘要:
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: ##STR1## wherein: R represents a group selected from optionally substituted alkyl and optionally substituted monocyclic aryl;Q represents a group selected from halo, OH, --NO.sub.2, alkyl, aryl and --NR.sub.1 R.sub.2, wherein each of R.sub.1 and R.sub.2 independently represents a group selected from H, alkyl and aryl;x represents an integer from 1 to 4; andy represents an integer from 0 to 4;x+y being in the inclusive range 2 to 4;provided that when x+y=2, x=1 and y=1.
摘要翻译:适用于客体主体液晶装置的材料包括液晶材料和多色染料的溶液,其中双色染料包含至少一种具有下式的化合物:其中:R代表所选的基团 从任选取代的烷基和任选取代的单环芳基; Q表示选自卤素,OH,-NO 2,烷基,芳基和-NR 1 R 2的基团,其中R 1和R 2各自独立地表示选自H,烷基和芳基的基团; x表示1〜4的整数, y表示0〜4的整数。 x + y在2〜4的范围内; 条件是当x + y = 2时,x = 1和y = 1。
摘要:
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: ##STR1## wherein one of X and Y is OH and the other is NHR wherein R is H or lower alkyl; each of R.sub.1 and R.sub.2 independently represents alkyl, aryl, aralkyl, alkoxy or --NR.sub.3 R.sub.4 wherein each of R.sub.3 and R.sub.4 is independently H or lower alkyl, provided that R.sub.2 is always adjacent to an OH group.
摘要翻译:适用于宾主液晶装置的材料包括液晶材料和多色染料的溶液,其中多色染料包含至少一种具有下式的化合物:其中X和Y之一为 OH,另一个是NHR,其中R是H或低级烷基; R 1和R 2各自独立地表示烷基,芳基,芳烷基,烷氧基或-NR 3 R 4,其中R 3和R 4各自独立地为H或低级烷基,条件是R 2总是与OH基相邻。