36results about How to "High negative dielectric anisotropy" patented technology

The invention relates to a polar compound liquid crystal mixture with the negative dielectric anisotrophy, which is characterized by being composed by one or a plurality of compounds in general formulas I-III, wherein R1, R2, R3, R4, R5 and R6 respectively and independently represent the linear chained alkyl with 1-8 carbon atom(s) or the alkoxy with 1-7 carbon atom(s), and Z1, Z2, Z3 and Z4 respectively and independently represent single linkages, - CH2CH2-, - C=-C-, -COO-, -OCH2-, -CH2O-, -CH=N-and the like, n represents three integers of 0, 1 or 2; and link A represents trans form 1, 4 cyclohexylidene or 1, 4-phenylene. The liquid crystal mixture has larger negative dielectric anisotrophy and higher clearing point.

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 relates to a liquid-crystal medium based on a mixture of polar compounds, the medium containing at least one compound of formula (I), in which R<11>, R<12>, A<1>, A<2>, Z<1>, Z<2>, m and n are defined as cited in claim 1. The invention also relates to the use of the medium in an active matrix display based on the ECB, PALC or IPS effect.

The invention relates to an alkene-terminated polyfluorinated diaryl acetylene liquid crystal compound and a synthesis method thereof. The compound is shown in the structural formula I as shown in the specification, wherein in the structural formula I, (F)m and (F)n both refer to fluorine atom substitutes; m and n refer to the substitute number of fluorine atoms, and the value thereof is 0-2; x refers to the number of connected methylene, and the value thereof is 0-3; and R refers to C1-C15 alkyls, C1-C15 alkenyls, C1-C15 alkoxy and C1-C15 enyloxy. According to the invention, because the compound is synthesized through adopting classic reactions such as nucleophilic substitution, coupling reaction, and the like, the operation is simple, and the yield and purity of products are high; and the compound has the advantages of large negative dielectric anisotropy, low melting point, wide liquid crystal phase interval, large double refraction, and the like, and can be applied to a dual-frequency liquid crystal display mode.

The invention discloses a cyclohexane liquid crystal compound which has the structure shown as the formula I. The liquid crystal compound is applied to a nematic liquid crystal composition and can be favorably dissolved with other liquid crystal monomers as well as can be used for effectively decreasing the rotary viscosity of the liquid crystal composition and obviously improving the response time of the liquid crystal composition so as to realize the purpose of rapid response. The invention further discloses a positive dielectric anisotropy liquid crystal composition containing the liquid crystal composition shown as the formula I and a negative dielectric anisotropy liquid crystal composition containing the liquid crystal composition shown as the formula I. The two liquid crystal compositions are rapid in response speed and short in response time, thereby being suitable for preparing various display-type liquid crystal displayers and liquid crystal display elements so as to bring good visual experiences to lookers. Thus, the two liquid crystal compositions have wide application prospects and market values.

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 discloses a liquid crystal compound having dielectric anisotropy. The structure of the compound is as shown in a formula I. The negative liquid crystal compound has negative dielectric anisotropy with a large absolute value, high reliability and relatively low viscosity, is good in intermiscibility with other liquid crystal components, and can be widely suitable for a liquid crystal display device. A liquid crystal composition comprising the compound can be applied to a liquid crystal display.

The invention relates to the field of liquid crystal display, in particular to a liquid crystal medium and application thereof. The liquid crystal medium comprises at least one compound represented bya general formula I and at least one compound represented by a general formula II, wherein the compound represented by the general formula I is a tricyclic compound containing a 2,3-difluorobenzene structure which has higher negative dielectric anisotropy and a high bright spot; the compound represented by the general formula II is a dicyclic compound containing a 2,3-difluorobenzene structure which is a negative dielectric anisotropic liquid crystal compound which adopts a fluoroethoxy structure at the tail end, thereby greatly improving the dielectric anisotropy of the liquid crystal compound. The liquid crystal medium provided by the invention has low rotating viscosity, high low-temperature mutual solubility and fast response time, is suitable for VA type liquid crystal display devices such as VA / MVA / PVA / PSVA as well as IPS and FFS mode liquid crystal display devices, and is very useful for improving the response time of liquid crystal display. The general formula I and the general formula II are shown in the description.

The invention relates to the field of liquid crystal materials, in particular to 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compounds. The compounds have a structure represented as a general formula I, wherein R represents alkyl or alkoxy with 1-12 carbon atoms; a ring A represents 1,4-phenylene, 1,4-cyclohexylidene or 1,4-phenylene with fluorine atoms substituting 1-4 hydrogen atoms; a ring B represents 1,4-phenylene, 1,4-cyclohexylidene, 1,4-cyclohexenylene or 1,4-phenylene with fluorine atoms substituting 1-4 hydrogen atoms; m is 0, 1 or 2. The liquid crystal compounds have the advantages of higher negative dielectric anisotropy, good liquid crystal intersolubility, relatively low rotary viscosity and the like which are needed for improvement of the crystal liquid materials, and the liquid crystal compounds have great application value.

The invention belongs to the field of liquid crystal compound materials, and relates to a liquid crystal compound containing dibenzothiophene and oxygen-containing heterocycles and application of the liquid crystal compound. The chemical structural formula is shown in the formula I. The liquid crystal compound and a liquid crystal composition containing the liquid crystal compound have the advantages of large dielectric, high clearing point, high refractive index, high K value and the like, and are suitable for displays in VA, ECB, PALC, FFS or IPS modes.

The invention relates to the field of liquid crystal display, and particularly relates to a nematic liquid crystal composition containing a fluoroethoxy structure. The nematic liquid crystal composition contains at least one compound represented by a general formula I and at least one compound represented by a general formula II, wherein the compound represented by the formula I is a liquid crystal compound which is of a 2, 3-difluorobenzene structure, the compound has relatively great negative dielectric anisotropy and a high clearing point; and the compound represented by the formula II is abicyclic liquid crystal compound having 2, 3-difluoro-1, 4-phenyl, and a terminus is of a fluoroethoxy structure for greatly improving dielectric anisotropy of the liquid crystal compound. The liquidcrystal composition provided by the invention has low rotational viscosity, excellent low-temperature intersolubility and fast response, is suitable for VA-type liquid crystal display devices such asVA / MVA / PVA / PSVA as well as IPS and FFS mode liquid crystal display devices, and is very effective for improving the response time of liquid crystal displays.

The invention provides a negative liquid crystal composition and a liquid crystal display device containing the same. The negative liquid crystal composition comprises a first component, a second component and a third component, wherein the first component is at least one compound shown as a general formula I, the second component is at least one or more selected from compounds shown as a general formula II-1, compounds shown as a general formula II-2, compounds shown as a general formula II-3 and compositions thereof, and the third component is at least one compound shown as a general formula III-1 and / or a general formula III-2. The negative liquid crystal composition is high in resistivity, high in dielectric anisotropy, proper in optical anisotropy and good in low-temperature stability. The liquid crystal display device is also provided.

The invention relates to the field of liquid crystal display, in particular to a compound which can be used as a liquid crystal medium. The compound has a structure as shown in a general formula I, wherein R1 is selected from H and alkyl or alkoxy which contains 1-12 carbon atoms, wherein the alkyl or alkoxy is non-substituted, or one or more Hs of the alkyl or alkoxy are substituted by halogens; the R1 is preferably methyl; R2 is selected from H, F and alkyl or alkoxy which contains 1-12 carbon atoms, wherein alkyl or alkoxy is non-substituted, or one or more Hs of the alkyl or alkoxy are substituted by halogens; the R2 is preferably selected form alkyl or alkoxy which contains 1-6 carbon atoms; the halogens are selected from fluorine, chlorine, bromine and iodine, and is preferably fluorine; A1 and A2 are respectively and independently selected from 1,4-cyclohexyl or 1,4-phenyl, wherein the Hs in the 1,4-phenyl are respectively and independently substituted by one or more Fs; a, b and c respectively and independently represent 0 or 1, and the sum of the a, the b and the c is more than 0 and less than or equal to 3. After the compound provided by the invention is added into a liquid crystal composition, the liquid crystal composition has the advantages of being low in rotary viscosity, high in negative dielectric anisotropy, high in optical anisotropy and high in clearing point, thus having wide application prospect. The formula I is described in the description.

The invention relates to the field of liquid crystal displays, in particular to a liquid crystal medium and application thereof. The liquid crystal medium comprises at least one compound shown as a general formula I and at least one compound shown as a general formula II, wherein the compound shown as the general formula I is a tricyclic compound containing a 2,3-difluorobenzene structure, and thestructure has a relatively large negative dielectric anisotropy and a high clearing point; the compound shown as the general formula II, provided by the invention, is a bicyclic compound containing a2,3-difluorobenzene structure, and the structure is a negative dielectric anisotropic liquid crystal compound which adopts a fluoroethoxy structure at a terminal so as to greatly enhance the dielectric anisotropy of the liquid crystal compound. The liquid crystal medium provided by the invention has low rotational viscosity, good low-temperature intersolubility and a short response time, is suitable for VA liquid crystal display devices such as VA / MVA / PVA / PSVA and IPS-mode and FFS-mode liquid crystal display devices, and is very effective for shortening the response time of liquid crystal displays.

The invention discloses a benzyne negative liquid crystal material 1-alkoxy-2, 3-difluoro-4-(2-(4-(trans-4-alkyl cyclohexyl) phenyl) acetenyl) benzene and a preparation method of the 1-alkoxy-2, 3-difluoro-4-(2-(4-(trans-4-alkyl cyclohexyl) phenyl) acetenyl) benzene. The 1-alkoxy-2, 3-difluoro-4-(2-(4-(trans-4-alkyl cyclohexyl) phenyl) acetenyl) benzene has the structural formula as shown in the specification, wherein R in the formula is linear chain alkyl with 2-5 carbon atoms, and R' is linear chain alkyl with 2-5 carbon numbers; coupling reaction is carried out between 2, 3-difluoro-4-alkoxy phenylacetylene and 4-(4-alkyl cyclohexyl) bromobenzene, and a reaction product is purified to obtain a product with the content of more than 98%; the delta n of liquid crystal molecules can be increased by introducing acetylenic bonds, and due to the introduction of fluorine atoms with maximum electronegativity and shorter semidiameter, the physical property of the liquid crystal molecules can be improved, the negative dielectric anisotropy can be greatly increased, and the thermal stability and the viscosity of matrix liquid crystals are basically invariable; and the benzyne negative liquid crystal material provided by the invention has the advantages of being low in melting point, proper in negative dielectric anisotropy, and good chemical stability and photochemical stability.

The invention relates to the field of liquid crystal display, in particular to a liquid crystal medium and application thereof. The liquid crystal medium at least contains a compound represented by ageneral formula I and at least one compound represented by at least one general formula II, wherein the compound represented by the general formula I is a three-ring compound with 2,3-difluorobenzenestructures; the structure has greater negative dielectric anisotropy and high clear points; the compound represented by the general formula II provided by the invention is a two ring compound with 2,3-difluorobenzene structures; the structure is the negative dielectric anisotropy liquid crystal compounds; the fluoro ethyoxyl structure is used as the tail end; the dielectric anisotropy of the liquid crystal compound is greatly improved. The liquid crystal medium provided by the invention has low rotary viscosity, good low-temperature mutual solubility and fast response time, is applicable to VAtype liquid crystal display devices such as VA / MVA / PVA / PSVA and IPS and FFS mode liquid crystal display devices; the medium is very effective on the improvement of the response time of the liquid crystal display. (The formulas are shown in the description.).

The invention relates to a novel self-alignment additive, the structural formula of the novel self-alignment additive is as shown in the specification, the additive disclosed by the invention is addedinto a liquid crystal compound, so that vertical self-alignment of liquid crystal molecules can be realized under the condition of not containing a polyimide alignment layer. The negative dielectricanisotropy of the liquid crystal compound is extremely high; and the liquid crystal compound has a relatively high clearing point, relatively high optical anisotropy, moderate rotary viscosity and liquid crystal intersolubility, has an excellent working effect under a low-temperature condition, can effectively reduce driving voltage and improve the response speed of a liquid crystal display device, and has the characteristics of moderate optical anisotropy numerical value, high charge retention rate and the like. Moreover, the compound is low in price and stable in performance, and has wide application value.

The invention relates to a liquid crystal vertical self-alignment additive as well as a preparation method and application thereof. The liquid crystal vertical self-alignment additive has a structureas shown in a general formula I, wherein R1 represents alkyl, alkoxy, alkenyl or alkenyloxy with 0-10 carbon atoms; a ring A represents a 1,4-phenylene group or a 1,4-cyclohexylidene group; Z1 and Z2independently represent a single bond, -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CH=N-, -N=CH-, -N=N-, a carbon-carbon triple bond, a C1-C12 alkylene group or a C2-C12 alkenyl; P1 and P2 independently represent an acrylate group, a methacrylate group, a fluorinated acrylate group, a chlorinated acrylate group, an ethyleneoxy group, an oxetane group or an epoxy group; L1 and L2 independently represent a hydrogen atom, a fluorine atom, or an alkyl group or alkoxy group having 1-5 carbon atoms; R2 represents an alkyl group having 0-10 carbon atoms; m represents 0 or 1; when m is equal to 0, R1 is 0; l represents 0, 1 or 2; r1 and r2 independently represent 0, 1, 2, 3 or 4; and n represents 1, 2, 3, 4 or 5.

The invention relates to a liquid crystal vertical alignment agent and a preparation method and application thereof. The liquid crystal vertical alignment agent has a structure shown as a formula I. Through interaction between -OH and a substrate surface, the alignment agent achieves vertical alignment of liquid crystal molecules without the presence of PI alignment film. The alignment agent is cheap and stable in performance, can be widely applied in the field of liquid crystal display and has important application value.

The invention relates to the field of liquid crystal display, in particular to a compound which can be used as a liquid crystal medium. The compound has a structure as shown in a general formula I, wherein R1 is selected from H and alkyl or alkoxy which contains 1-12 carbon atoms, wherein the alkyl or alkoxy is non-substituted, or one or more Hs of the alkyl or alkoxy are substituted by halogens; the R1 is preferably methyl; R2 is selected from H, F and alkyl or alkoxy which contains 1-12 carbon atoms, wherein alkyl or alkoxy is non-substituted, or one or more Hs of the alkyl or alkoxy are substituted by halogens; the R2 is preferably selected form alkyl or alkoxy which contains 1-6 carbon atoms; the halogens are selected from fluorine, chlorine, bromine and iodine, and is preferably fluorine; A1 and A2 are respectively and independently selected from 1,4-cyclohexyl or 1,4-phenyl, wherein the Hs in the 1,4-phenyl are respectively and independently substituted by one or more Fs; a, b and c respectively and independently represent 0 or 1, and the sum of the a, the b and the c is more than 0 and less than or equal to 3. After the compound provided by the invention is added into a liquid crystal composition, the liquid crystal composition has the advantages of being low in rotary viscosity, high in negative dielectric anisotropy, high in optical anisotropy and high in clearing point, thus having wide application prospect. The formula I is described in the description.

The invention relates to a self-alignment additive for a liquid crystal medium, and a preparation method and application of the self-alignment additive. The self-alignment additive is a compound witha structure represented by the following general formula I. In the general formula I, R represents alkyl, alkoxy, alkenyl or alkenyloxy with 1-10 carbon atoms; the ring A represents 1,4-phenylene, 1,4-cyclohexylidene, 1,4-cyclohexenylene, or 1,4-phenylene with 1-4 hydrogen atoms substituted by fluorine; the ring B represents 1,4-phenylene, 1,4-cyclohexylidene, or 1,4-phenylene with 1-4 hydrogen atoms substituted by fluorine; l and m separately represent 0, 1 or 2, and 0<l+m<=3; and n represents 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10. The self-matching additive realizes vertical orientation of liquidcrystal molecules under the condition that no polyimide (PI) alignment layer is contained. In addition, 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 present invention relates to a liquid crystal compound represented by formula A, a method for preparing the liquid crystal compound, and an intermediate used in the method for preparing the liquidcrystal compound and a method for producing the intermediate, wherein R1 is an alkenyl group having 2 to 12 carbon atoms, n is a positive integer of 1 to 12, and R2 is an alkyl group having 1 to 8 carbon atoms. The liquid crystal compound is prepared with 2,2',3,3'-tetrafluoro[1,1'-biphenyl]-4-phenol as a raw material through the steps of substitution, halogenation, boronation, coupling, oxidation, ylide reaction and the like. The preparation method has the advantages of common and readily available reagents, low price, simple and clear steps, convenience and safety in operation and higher yield. The liquid crystal composition composed of the compound has a high clearing point, a high absolute value of negative dielectric anisotropy, high optical anisotropy and good low-temperature stability, and can meet the requirements of low-voltage driving and quick response when being applied to a liquid crystal display.

The invention relates to a novel liquid crystal vertical alignment agent. The novel liquid crystal vertical alignment agent has a structure shown in a general formula I. The invention simultaneously relates to a preparation method and application of the alignment agent. According to the alignment agent, through interaction between -SH and the substrate surface, vertical orientation of liquid crystal molecules is achieved under the situation of not containing a PI oriented film. The novel liquid crystal vertical alignment agent is low in coat and stable in performance, can be widely used in thefield of liquid crystal display, and has important application value.

The invention relates to a self-alignment additive and a preparation method and application thereof. The additive is a compound shown as a general structure I. Through interaction between -OH and a substrate surface, the additive achieves vertical alignment of liquid crystal molecules in a situation of no PI alignment film exists. The additive is cheap and stable in performance, can be widely applied in the field of liquid crystal display and has important application value.