摘要:
2,5-substituted 1,3,4-thiadiazoles of the general formula ##STR1##The aforementioned compounds are used in amounts of 0.1 to 80 mole percent in mixtures for electrooptical arrangements for the modulation of transmitted and reflected light, as well as for the colored or black-and-white display of numerals, symbols and moving or still pictures. The compounds endow the liquid-crystalline mixtures with an extended phase field of the smectic C phase, negative dielectric anisotropy and the property of forming optically active C phases upon admixture with optically active compounds.
摘要:
Nematic liquid crystals are employed in electro-optical devices for the modulation of the transmittant or incident light and for the black and white or colored rendition of numerals, symbols and pictures.The object of the invention is the use of nematic liquid crystals having a high positive dielectric anisotropy, a low threshold and operating voltage and high clear points and a process for making these compounds.It was found that as liquid crystals for electro-optical devices mixtures are useful which, as an essential component, contain one or several compounds from the class of 5-cyano-2-[4-acyloxyphenyl]-pyrimidines of the formula ##STR1## wherein R.sup.1 is ##STR2## C.sub.5 H.sub.11 -- or C.sub.n H.sub.2n+1 O-- R.sup.2 is C.sub.n H.sub.2n+1 ; C.sub.n H.sub.2n+1 O; C.sub.n H.sub.2n+1 S; F; Cl; Br; CF.sub.3 ; C.sub.n H.sub.2n+1 COO; C.sub.n H.sub.2n+1 OCOO; CN; NO.sub.2 ; C.sub.n H.sub.2n+1 NH; or C.sub.n H.sub.2n+1 (CH.sub.3)N, n is 1 to 10, andR.sup.3 is C.sub.n H.sub.2n+1,n is 1 to 10.
摘要:
Liquid crystal compound for color modulation of light in electro-optical devices characterized by an oriented smectic C-phase with positive dielectric anisotropy. The compound has the property of a dichroitic dyestuff.
摘要:
The invention concerns crystalline liquid substituted 1,3-dioxanes and compositions containing the same for use in electro-optical components, characterized by at least one compound of the general formula: ##STR1## R.sup.3 =C.sub.n H.sub.2n+1 ; C.sub.n H.sub.2n+1 O, Cl, Br, CN, NO.sub.2, and where R.sup.4 =C.sub.n H.sub.2n+1 and n=1 to 10.
摘要:
Photosensitive orientation material providing unidirectional LC alignment to generate a high pretilt angle for various LC compounds, and superior thermal stability, and being suitable for mass production, especially for active matrix LC displays, including polysiloxane, and a derivative of a cinnamoyl group.
摘要:
Fast-switching displays with memory properties are provided, which can display digits, symbols, and images, and which contain as chemically and thermally stable ferroelectric liquid crystalline substances, according to the invention, liquid crystalline derivatives which contain a chiral alkyl halide residue corresponding to the general formula ##STR1## are used in mixtures of one another as well as in conjunction with other liquid crystalline or non-crystalline liquid substances.
摘要翻译:提供具有存储器特性的快速切换显示器,其可以显示数字,符号和图像,并且其包含作为化学和热稳定的铁电液晶物质,根据本发明,液晶衍生物含有对应于 通式 I 以彼此的混合物以及与其它液晶或非结晶液体物质结合使用。
摘要:
Nematic liquid crystalline substances as additives in mixtures for electro-optical systems for the rendition of numbers, symbols and images. The additives provide new liquid crystalline substances of broad mesophase ranges which improve the chemical stability of the substance mixtures. It has been found that liquid crystalline 5-alkyl-pyridine-2-carboxylic acid esters of the general formula ##STR1## are suitable for utilization in mixtures for electro-optical displays for the rendition of numbers, symbols and images.
摘要翻译:向列液晶物质作为电子光学系统的混合物中的添加剂,用于数字,符号和图像的再现。 这些添加剂提供了广泛的中间相范围的新的液晶物质,可改善物质混合物的化学稳定性。 已经发现,具有通式为:图像的液晶5-烷基 - 吡啶-2-羧酸酯,R1 = OCnH2n + 1,CN ,C n H 2n + 1其中m,n = 1至8适用于电光显示器用于再现数字,符号和图像的混合物中。
摘要:
A mixing component for nematic liquid-crystalline substances used in optoelectronic components for the rendition of numbers, symbols and images. The object of the invention is to reduce, in components for nematic liquid crystal substances, the threshold and operating voltages. It has been found, that the addition of one or more 1-oxa-2,6,7-trioxane-1-phospha-bicyclo-derivatives having the general formula ##STR1## wherein ##STR2## with R.sup.1 =C.sub.n H.sub.2n+1 --, C.sub.n H.sub.2n+1 O--, C.sub.n H.sub.2n+1 COO--, C.sub.n H.sub.2n+1 OCOO--, R.sup.2 +C.sub.n H.sub.2n=1 --with n=an integer from 1 to 10to nematic liquid crystal substances, considerably reduces the operating voltage.
摘要:
Nematic liquid crystalline mixtures, which can be used in optoelectronic components. Compounds are provided which influence the characteristics of mixtures in the direction of high clarification temperatures at simultaneous favorable switching times. It has been found that compounds of the general formula ##STR1## wherein n, m=1 to 10 in nematic mixtures in quantities of 5 to 40% considerably increase the clarification points without significantly increasing the viscosity, so that favorable switching times are obtained. The new mixtures can be used for the production of optoelectronic components (displays) for watches, computers and other devices.
摘要:
A nematic liquid crystal mixture for modulation of the transmitted or incident light and for rendition of colored numerals, symbols and images in electro-optical devices, the said mixture comprising(a) a nematic liquid crystal adapted for reorientation in an electrical field due to its dielectric anisotropy and(b) a dichroic dyestuff adapted for simultaneous orientation changes together with the said nematic liquid crystal between a light absorption and a light transmission position based on the guest-host effect, the said dyestuff being an s-tetrazine derivative having an elongate molecular structure and having the formula ##STR1## wherein X is ##STR2## R.sup.1 and Y is R.sup.2 -- or ##STR3## R.sup.1 being H--, F--, Cl--, Br--, J--, O.sub.2 N--, NC--, HO--, H.sub.2 N--, C.sub.n H.sub.2n+1 NH--, C.sub.n H.sub.2n+1 (CH.sub.3)N--, C.sub.n H.sub.2n+1" --, C.sub.n H.sub.2n+1 O--, C.sub.n H.sub.2n+1 S--, C.sub.n H.sub.2n+1 COS--, C.sub.n H.sub.2n+1 COO--, C.sub.n H.sub.2n+1 OOC--, C.sub.n H.sub.2n+1 CO-- or C.sub.n H.sub.2n+1 OCOO--, andR.sup.2 being H--, F--, Cl--, Br--, J--, O.sub.2 N--, NC--, HO--, H.sub.2 N--, C.sub.n H.sub.2n+1 NH--, C.sub.n H.sub.2n+1 (CH.sub.3)N--, C.sub.n H.sub.2n+1 --, C.sub.n H.sub.2n+1 O--, C.sub.n H.sub.2n+1 S--, C.sub.n H.sub.2n+1 COS--, C.sub.n H.sub.2n+1 COO--, C.sub.n H.sub.2n+1 OOC--, C.sub.n H.sub.2n+1 CO-- or C.sub.n H.sub.2n+1 OCOO--, andR.sup.3 being H--, F--, Cl--, Br--, J--, CH.sub.3 -- or CF.sub.3 --, andR.sup.4 being H--, F--, Cl--, Br--, J--, CH.sub.3 --, or CF.sub.3 --,n is a positive integer.
摘要翻译:一种向列型液晶混合物,用于调制透光或入射光,并用于在电光装置中再现有色数字,符号和图像,所述混合物包括(a)适于由于其电场而在电场中重新取向的向列型液晶 介电各向异性和(b)适于与所述向列型液晶同时取向改变的二色性染料在基于客体主效应的光吸收和透光位置之间,所述染料是具有细长的四 分子结构并具有下式的化合物,其中X为R 1,Y为R 2,或者R 1为H,F-,Cl-,Br-,J-,O 2 N-,NC-,HO- ,CnH2n + 1NH-,CnH2n + 1(CH3)N,CnH2n + 1“,CnH2n + 10,CnH2n + 1S-,CnH2n + 1COS-,CnH2n + 1COO-,CnH2n + CnH2n + 1CO-或CnH2n + 1OCOO-,R2为H,F-,Cl-,Br-,J-,O2N-,NC-,HO-,H2N-,CnH2n + 1NH-,CnH2n + )N,C n H 2n + 1,C n H 2n + 10,C n H 2n + 1S-,C n H 2n + ,CnH2n + 1COO-,CnH2n + 10OC-,CnH2n + 1CO-或CnH2n + 10COOO-,R3为H,F-,Cl-,Br-,J-,CH3-或CF3-,R4为H- ,F-,Cl-,Br-,J-,CH 3 - 或CF 3 - ,n是正整数。