摘要:
Novel 2,5-disubstituted heterocyclic compounds of the formula I ##STR1## in which n is 1 to 10,Het is ##STR2## Ring A is trans-1,4-cyclohexylene or, in the case where Het= ##STR3## X=--OCF.sub.3 or --OCHF.sub.2 and/or Y=Z=F, is alternatively 1,4-phenylene,X is CN, F, Cl, --CF.sub.3, --OCF.sub.3 or --OCHF.sub.2, andY and Z are each, independently of one another, H or F, can be used as components of liquid-crystalline media.
摘要翻译:新的2,5-二取代杂环化合物,其中n为1至10,Het为环A为反式-1,4-亚环己基,或在Het = X = -OCF 3或-OCHF 2和/或Y = Z = F,或者1,4-亚苯基,X是CN,F,Cl,-CF 3,-OCF 3或-OCHF 2,Y和Z各自 彼此独立地可以使用H或F作为液晶介质的组分。
摘要:
Chiral, tilted, smectic liquid-crystal phases containing at least two liquid-crystal components and at least one chiral doping agent, at least one liquid-crystal component being a compound having the structural unit 2,3-difluoro-1,4-phenylene, are distinguished by a very low viscosity and advantageous switching times.
摘要:
Novel cyanohydrin derivatives of general formula (I) wherein R.sup.1 is hydrogen, alkyl, alkoxy, perfluoroalkyl or perfluoroalkoxy, R.sup.2 is alkyl, r is 1 to 10, n and m are 0 or 1, provided if both n and m are 0 then X is (II) or (III), where (F) indicates one or more optional fluorines, p is 0 or 1, Z is a single bond if p is 0 and COO if p is 1; and if one or both of n or m are 1 then X is (IV), where each ring A, B and C is phenyl, fluoro- or chloro-phenyl, cyclohexyl, pyrimidyl, pyridyl, or dioxanyl, A, B and C are single bonds or linking groups, and (a+b+c) is 2 or 3. Liquid crystal materials containing these compounds are also described.
摘要:
Novel lactic acid derivatives which may be used as a component of a ferroelectric smectic liquid crystal mixture, which derivatives have the general formula: ##STR1## in which R.sub.1 is alkyl or alkoxy and R.sub.2 is alkyl. Liquid crystalline compositions containing these compounds are also described.
摘要:
A heavy duty wheeled trailer for use in towing the trailer behind a vehicle. The trailer includes an adjustable height tow connection point to adjust and connect to different types of tow vehicles while maintaining the front deck substantially parallel to the trailer main deck. The trailer further includes a modular support frame allowing the trailer to be easily scaled in length and performance capabilities through removal or addition of modular frame cells.
摘要:
A cholesteric liquid crystal display device (40) comprises a stack of three cells (10), each cell comprising a layer of cholesteric liquid crystal material (19) capable of being switched between a plurality of states including a planar state in which it reflects light with wavelengths in a central band (31) corresponding to red, green and blue, respectively, and in overtone bands (32, 33) on both sides of the central band (31). Each adjacent pair of cells 10 in the stack is held together by a layer of adhesive (42, 43). At least one of the layers of adhesive (42, 43) includes a red dye which is absorbent of light with wavelengths in the overtone bands (32) on the side of the central band (31) of lower wavelength. The red dye improves the perceived red colour of light reflected from the red cell (10R) by suppressing the overtone bands. The provision of the red dye in the adhesive provides several advantages in manufacture.
摘要:
A liquid crystal display device includes at least one cell which provides a rectangular array of addressable pixels having an average area of at least 4 mm2. The cell comprises: two substrates (11, 12) defining therebetween a cavity; a layer of liquid crystal material in the cavity; and a respective conductive layer (13, 14) formed on each of the substrates (11, 12). The conductive layers (13, 14) are patterned to provide a rectangular array of separate drive electrodes (51) each capable of driving an area of the layer of liquid crystal material adjacent the respective drive electrode as one of said pixels. The conductive layers (13, 14) also provide a separate track (33) connected to each of the separate drive electrodes (51) and extending to a position outside the array of addressable pixels where the tracks (33) form terminals (34) each capable of receiving a respective drive signal. This allows direct addressing of the pixels. The relatively large size of the pixels allows such direct drive without an unacceptable reduction in the contrast ratio. In addition, the conductive layers may be patterned in a variety of ways to further improve the contrast ratio, e.g. the second conductive layer (14) is patterned to provide a common electrode (72) and a plurality of separate counter electrodes (76). Each respective counter electrode (76) extends over an area opposite one of the gaps (35) between the lines of the electrodes (51).
摘要:
An optical compensator for liquid crystal displays comprising at least one O plate retarder, at least one low tilt A plate retarder, and at least one negative C plate retarder is described. Also described are liquid crystal displays comprising such a compensator.
摘要:
The invention relates to polymer beads comprising an anisotropic polymer material with helically twisted structure, to their use in reflective films, spraying or printing inks or as pigments, for optical or electrooptical, decorative or security applications, to a reflective film comprising one or more polymer beads in a transmissive binder, and to a security marking or security device comprising one or more polymer beads or comprising a reflective film.
摘要:
To improve switching times, especially at low temperatures, one or more reactive liquid crystalline compounds is added to a liquid crystal mixture used in an electroptical system. The electroptical system comprises a PDLC film comprising a liquid crystal mixture forming micro-droplets in an optically isotropic, transparent polymer matrix between 2 electrode layers. The liquid crystal mixture comprises one or more compounds of the formula I wherein R, A1, A2, Z1, Z2, X1, X2, Q, Y and n are as defined herein.