231results about How to "High optical anisotropy" patented technology

A blue phase liquid crystal composition and a LC display using the composition. The liquid crystal composition includes a first class including a highly polar compound and a second class including a highly conjugated liquid crystal compound. The blue phase liquid crystal display device includes first and second substrates each with polarizer on the exterior surface and the blue phase liquid crystal composition sandwiched therebetween with and patterned electrodes on one of the substrates or both substrates. The patterned electrodes can be T-shaped, chevron or v-shaped, thin comb like shape and can also be flat or trapezoidal. The device outputs different light transmissions from the electrically controllable induced birefringence of the blue phase LC material for a low driving voltage, high transmittance blue phase liquid crystal display device.

The invention discloses a liquid crystal composition, comprising a first variety of compound shown as a general formula I, a second variety of compound shown as a general formula II, a third variety of compound shown as a general formula III and a fourth variety of compound shown as a general formula IV; the invention also provides a liquid crystal lens employing the liquid crystal composition. The liquid crystal composition of the present invention has characteristics of low nematic phase initial voltage, wide phase transition temperature scope, small viscoelastic coefficient ratio gamma 1 / K11, large optical anisotropy and large dielectric anisotropy, etc., and can reduce a thickness value of a liquid crystal lens box and increase response speed of the liquid crystal lens box.

The invention provides a liquid crystal composition with high transmittance. The liquid crystal composition contains at least one or more of compounds represented by general formula I shown in the description and at least one of compounds represented by formula II shown in the description. The liquid crystal composition has the characteristics of low viscosity, high resistivity, good low temperature intersolubility, fast response speed and excellent transmittance, and can be used in fast response liquid crystal display with multiple display modes. FFS and IPS are most mainstream display modes at present, but the problem of low transmittance of the FFS and the IPS is a key problem to be solved. A result of experiments shows that the liquid crystal composition with large dielectric strength has high transmittance, so the brightness is improved without increasing the electric energy consumption. The liquid crystal composition provided by the invention has large dielectric strength, and effectively improves the transmittance of liquid crystal displays, and especially the displays in the FFS and IPS display modes.

The invention provides a liquid crystal composition and an application thereof. Based on 100 percent by mass of the composition, the liquid crystal composition comprises the following components in percentage by mass: 0-70 percent of a nematic liquid crystal compound shown as a formula I, 0-50 percent of a nematic liquid crystal compound shown as a formula II, 0-50 percent of a nematic liquid crystal compound shown as a formula III, 0-30 percent of a nematic liquid crystal compound shown as a formula IV and 0-30 percent of a nematic liquid crystal compound shown as a formula V. The liquid crystal composition has high birefringence rate, and has the characteristics of high upper limit temperature of a nematic phase, low lower limit temperature of the nematic phase, low rotation viscosity, high response speed and the like. The liquid crystal composition provided by the invention can be applied in the fields of variable-focus liquid crystal lenses and the like.

A tetracyclic compound expressed by the following general formula (1)wherein H1 to H12 represent hydrogen atom at least one of which is replaced by a halogen atom, when either H6 or H8 is replaced by a halogen atom, at least one of the remaining hydrogen atoms is replaced by a halogen atom; R1 and Y1 independently represent an alkyl group, alkoxy group, or alkoxyalkyl group having 1 to 20 carbon atoms, or an alkenyl group having 2 to 20 carbon atoms, one or more methylene group in R1 and Y1 may be replaced by oxygen atom, sulfur atom, dihydrosilylene group, dimethylsilylene group, -CH=CH-, or -C=C-; and X1, X2, and X3 independently represent a covalent bond, 1,2-ethylene group, or 1,4-butylene group; and a novel liquid crystal composition comprising the tetracyclic compound and having, at the same time, a wide temperature range of a nematic phase, high optical anisotropy, and high chemical stability.

The invention discloses a liquid crystal composition which comprises 1-70wt% of liquid crystal compound shown by formula I, 1-90wt% of liquid crystal compound shown by formula II and 0-70wt% of liquid crystal compound shown by formula III. The liquid crystal composition disclosed by the invention has high optical anisotropy, relatively wide nematic phase temperature range, high clearing point range, relatively low rotary viscosity and proper dielectric anisotropy, thus the liquid crystal composition can realize relatively low box thickness and relatively low drive voltage of a liquid crystal lens; moreover, the liquid crystal composition has the characteristics of fast response, relatively high optical efficiency and the like.

The present invention relates to one kind of 2, 3, 2', 3'-tetrafluoro acetylene derivative and its composition, preparation process and use. The compound has the general expression as shown, relatively great optical anisotropy, relatively great negative dielectric anisotropy, relatively high light and heat stability and relatively low viscosity. The compound may constitute well behaved nematic phase liquid crystal composition with low threshold voltage, low viscosity, high response speed, improved response characteristic and contrast, and the nematic phase liquid crystal composition may be used in liquid crystal display of TN mode, STN mode, TFT mode, PDLC mode, etc. In addition, the compound has facile material and simple synthesis path, and the process is suitable for industrial production.

The present invention relates to a reactive triphenyl diethyne compound, which can take part in the copolymerization reaction with cholesterol-type liquid crystal to prepare cholesterol-type reflecting polaring plate.

The invention provides a liquid crystal composition comprising: at least one compound, as a first component, selected from the general formula I; at least one compound, as a second component, selected from the general formula II; at least one compound, as a third component, selected from the general formula III-1 and / or the general formula III-2; and at least one compound, as a fourth component, selected from the general formula IV. The liquid crystal composition is low in viscosity, is high in clearing point and is large in optical anisotropy and dielectric anisotropy. The invention also provides a liquid crystal display apparatus comprising the liquid crystal composition, wherein the liquid crystal display apparatus can be used in an IPS mode, a VA mode, a PS-VA mode, a PALC mode, an FFS mode or an ECB mode.

A liquid crystal composition include a first compound (a) and a second compound (b), wherein the molecular structure formula of the first compound is represented as follows and the molecular structure formula of the second compound is represented as follows. The liquid crystal composition also includes a third compound (c) of which the molecular structure formula is represented as follows. The liquid crystal composition has high birefringence. The invention also relates to a liquid crystal lens including the liquid crystal composition.

The invention provides compounds including an indene and a difluoroethylene bridge bond and having a general formula (I), a preparation method thereof and an application thereof. The compounds have large optical anisotropies (delta n), low rotary viscosities (gamma) and wide nematic phase temperature ranges, so the response speed of liquid crystal devices using the compounds can be accelerated, and the working range of the liquid crystal devices can be enlarged, thereby the liquid crystal devices can maintain good display in various environments. The invention also provides one or more liquid crystal compositions of the compounds, and liquid crystal elements including the composition(s).

The invention discloses a liquid crystal medium. The liquid crystal medium is a compound containing the following components, wherein a first component must contains one or more compounds represented in the general formula I1 and further contains one or more contain compounds represented in the general formulae (I2-I5) or not; a second component contains one or more liquid crystal compounds represented in the general formula II, and the dielectric anisotropy of the liquid crystal compounds are negative; a third compound contains one or more liquid crystal compounds, the dielectric anisotropy of the liquid crystal compounds are negative, and the absolute values of the liquid crystal compounds are more than 3. A liquid crystal composition disclosed by the invention has the characteristics of negative dielectricity, low rotary viscosity, high response speed and particularly good ultraviolet stability, is applicable to the manufacturing of the liquid crystal medium with negative dielectric anisotropy for displays addressed through active matrixes and particularly liquid crystal displays based on a VA effect or an ECB effect.

The invention provides a liquid crystal composition. The liquid crystal composition comprises the following components by weight percentage: 1, a first component comprises compounds which are represented by a general formula I and a general formula II, the content of the first component is 1-65%, and preferentially is 35-65%; 2, a second component comprises compounds which are represented by a general formula III, a general formula IV and a general formula V, the content of the second component is 1-60%, and preferentially is 30-60%; and 3, a third component comprises compounds which are represented by a general formula VI and a general formula VII, the content of the third component is 1-55%, and preferentially is 5-35%. The liquid crystal composition has the characteristics of fast response time, low rotary viscosity, high-definition bright spot, high dielectric anisotropy and high transmittance and can well meet the rigorous requirements of a shutter mirror and display devices such as 3D (three dimension), TN (twisted nematic), STN (super twisted nematic), TN-TFT(twisted nematic-thin film transistor), OCB (optically compensated birefringence), IPS (in-plane switching), PS-IPS (-in-plane switching), VA-IPS (vertical alignment-in-plane switching), FFS (fringe field switching), PS-FFS (-fringe field switching), PS-VA-IPS (polymer stabilized-vertical alignment-in-plane switching) and the like.

The invention provides a liquid crystal compound containing a tetrahydropyrane ring. The liquid crystal compound has a structure shown in a formula I. The compound has the tetrahydropyrane ring and a -O(CH2)nF unit structure at the same time and has the characteristics of low rotary viscosity and great dielectric anisotropy, can further improve the dielectric anisotropy, the optical anisotropy and clearing points of the existing customary liquid crystal compound when being applied to the liquid crystal compound and has the technical effect of reducing the driving voltage and expanding the using range of temperature. After the liquid crystal compound is applied to a liquid crystal display device, the liquid crystal compound has the advantages of low driving voltage and wide using range of temperature.

The invention relates to a negative dielectric anisotropic liquid crystal composition or rather a negative dielectric anisotropic liquid crystal composition containing one or more dichlorobicyclohexyl compounds and an application thereof. The composition is mainly used for electrooptical adjustment and is especially suitable for FFS (fringe field switching) displays, IPS (in-plane switching) displays and MVA (multi-domain vertical alignment) / PVA (patterned vertical alignment) / PSVA (polymer-stabilized vertical alignment) configuration VA (vertical alignment) type displays. The liquid crystal composition provided by the invention has high optical anisotropy, excellent low-temperature intersolubility and good high temperature and UV (ultraviolet) stability, and is suitable for fast response display devices in various display modes. The defect of relatively low optical anisotropy is overcome, the optical anisotropy of the composition is effectively improved, and the thickness of the liquid crystal layer is reduced, thereby increasing the response speed of the liquid crystal displays. Applied to the liquid crystal display devices, the liquid crystal composition can obviously solve the problem of slow response of the devices and has huge application prospects and market values.

The invention discloses a liquid crystal compound containing an isothiocyanic acid radical as well as a preparation method and an application thereof. The structural general formula of the liquid crystal compound containing the isothiocyanic acid radical is disclosed in a formula I. The compound containing the isothiocyanic acid radical is a liquid crystal monomer; the monomer of the class has bigger optical anisotropy (delta n); and after the monomer is added into mixed liquid crystal, the optical anisotropy of the mixed liquid crystal can be greatly increased so as to improve the property of the mixed liquid crystal. The formula I is as follows.

The invention relates to a quick-response liquid crystal composition with negative dielectric anisotropy as well as an application thereof. The quick-response liquid crystal composition with negative dielectric anisotropy provided by the invention has great optical anisotropy and excellent low-temperature intersolubility as well as good high-temperature and UV (Ultraviolet) stability and is suitable for quick-response display devices with various display modes. The quick-response liquid crystal composition with negative dielectric anisotropy overcomes the defect of smaller optical anisotropy, the optical anisotropy of the composition is effectively enhanced, and the thickness of the liquid crystal layer is reduced, so that the response speed of the liquid crystal display is accelerated. The quick-response liquid crystal composition with negative dielectric anisotropy applied to the liquid crystal device can remarkably improve the problem that the liquid crystal display is slow in response and has huge application prospect and market value.

The invention discloses a liquid crystal compound and a preparation method thereof, a liquid crystal composition and a microwave communication device. The liquid crystal compound has a structure as shown in a structural formula (I). A quaterphenyl structure is existent in the structure of the liquid crystal compound, so that the liquid crystal compound has the advantages of being large in opticalanisotropy and structure stability, and is in favor of reducing dielectric loss of the liquid crystal microwave device when being applied to high-dielectric anisotropy liquid crystal material, and thephase modulation capacity can be improved and the quality factor of the liquid crystal material can be increased.

The invention discloses a liquid crystal composition. The liquid crystal composition contains at least one compound of a formula I, and at least one compound of a formula II. The invention also discloses a liquid crystal display device containing the liquid crystal composition. The liquid crystal composition provided by the invention has the characteristics of large absolute value of dielectric anisotropy, good low temperature storage performance, high optical anisotropy, high clearing point, low rotational viscosity and large nematic phase temperature range, has the advantages of fast response speed, high contrast ratio, good weather resistance, and the like, when applied to a display element, and is particularly suitable for use in a liquid crystal display element driven by an active matrix thin film transistor (AM-TFT).

The invention discloses a 2-site pyrimidine ring liquid crystal compound containing acetenyl and a preparation method thereof, belonging to the field of chemical industry. The general formula of the chemical structure of the new pyrimidine ring liquid crystal compound of the invention is that: the structure of the compound comprises pyrimidine ring and phenylethynyl; the compound has relatively large optical anisotropy, relatively low viscosity and relatively wide nematic phase temperature range. If a liquid crystal compound or a compound is added with the liquid crystal compound of the invention, a liquid crystal compound with good capacities can be obtained and the response speed and the low temperature compatibility of a nematic phase liquid crystal composition for display can be greatly improved. The 2-site pyrimidine ring liquid crystal compound containing acetenyl can be used in RSM, PDLC and optical communication etc. having higher requirements on liquid crystal displays of large delta-n liquid crystal materials.

The invention provides a liquid crystal composition and its liquid-crystal display device. The liquid crystal composition comprises at least one compound as shown in the general formula I-1 and / or I-2; at least one compound as shown in the general formula II; at least one compound as shown in the general formula III; at least one compound as shown in the general formula IV; and at least one compound as shown in the general formula V. The liquid crystal composition has characteristics of wide nematic-phase temperature range, high dielectric anisotropy, high optical anisotropy, high clearing point, low viscosity, low threshold voltage and the like. The liquid crystal composition is suitable for a liquid-crystal display element. By the use of the liquid crystal composition, the liquid-crystal display element has characteristics of low threshold voltage, fast response speed, excellent power-saving property and the like.

The invention discloses liquid crystal composition with negative dielectric anisotropy. The liquid crystal composition comprises a first component comprising one or more of compounds shown in formulaI, a second component comprising two or more of compounds shown in formula II and a third component comprising one or more of compounds shown in formula III. The invention also discloses a liquid crystal display comprising the liquid crystal composition. The liquid crystal composition has proper dielectric anisotropy and proper rotary viscosity, can meet the requirement for quick response of the liquid crystal display, has characteristics of higher clearing point, wide nematic phase temperature range, higher optical anisotropy, good low-temperature mutual solubility, higher voltage retention rate, good high-temperature stability, good ultraviolet resistance and the like and is applicable to the liquid crystal display.

The present invention relates to the liquid crystal field, and particularly relates to a liquid crystal composition and use thereof in the liquid crystal display field. The liquid crystal composition of the present invention comprises, in percentages by weight, 5-40% of one or more compounds represented by general formula I, 2-30% of one or more compounds represented by general formula II, and 20-70% of one or more compounds represented by general formula III, and may further comprise 4-30% of one or more compounds represented by general formula IV and / or 5-25% of one or more compounds represented by general formulas V to IX. The combined use of the above-mentioned compounds can effectively reduce the rotational viscosity of the liquid crystal composition, improves related properties of the mixed liquid crystal, and thus reduces the response time thereof. The liquid crystal composition of the present invention can be used for a fast-response liquid display in a variety of display modes.

The invention provides a liquid crystal composition and application thereof. The liquid crystal composition comprises the following components in percentage by weight: 1 to 35 percent of a compound with the general formula (I), 1 to 50 percent of a compound with the general formula (II), 30 to 75 percent of a compound with the general formula (III), and 0 to 30 percent of a compound with the general formula (IV). The liquid crystal composition can be used in a liquid crystal element, and has the performances of high response speed and excellent power-saving property and properly high optical anisotropy.

A process for producing a laminate comprises the steps of: coating a water solution containing water and a water-soluble liquid crystal compound on a surface of a substrate to form a coating film; and drying the coating film by placing the coating film in an atmosphere having 70% RH or higher to less than 100% RH to more than 10% by weight of the solvent in the coating film; wherein an optical anisotropic layer is formed on the surface of the substrate by exerting a regulating force on the water-soluble liquid crystal compound to orient the water-soluble liquid crystal compound in the drying process.

The invention belongs to the technical field of liquid crystal materials, and particularly relates to a dibenzofuran polymerizable compound and an application thereof. The liquid crystal compound provided by the invention has a structure as shown in a general formula I. Compared with the prior art, the polymerizable liquid crystal compound provided by the invention has good solubility and a betteralignment effect, the polymerization rate is higher, polymerization is more complete, and the residue amount is lower, so that the problem of poor display is improved to a large extent. A liquid crystal composition containing the compound is better in alignment effect, is polymerized more completely and has fewer residues. Moreover, the compound is low in price and stable in performance, can be widely applied to the field of liquid crystal display, and has an important application value.

The invention provides a polyvinylidene floride derivative with a general formula (1) taken as a liquid crystal medium component, and a preparation method and application thereof. The derivative is a negative liquid crystal compound and has big dielectric anisotropic absolute value, proper optical anisotropy, high clearing point and wider nematic phase temperature range; and a display applying the derivative has quicker response speed and wider working range and can keep good display in various environments. The invention also provides one or more liquid crystal composition(s) including the derivative and a liquid crystal element including the liquid crystal composition (s).