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 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 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 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 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 discloses a high negative dielectric anisotropy liquid crystal mixture with high birefringence and low viscosity. The liquid crystal mixture contains the following components by mass percent: 35-50% of I compound, 10-30% of II compound, 5-10% of III compound, 10-15% of IV compound, 1-3% of V compound, 10-20% of VI compound and 0.05-0.1% of VII compound, wherein the formulas are as shown in the specification. The high negative dielectric anisotropy liquid crystal mixture can be used as a material for liquid crystal devices such as a liquid crystal display and a functional liquid crystal film, so that the liquid crystal devices more easily achieve the vertical orientation effect, drive voltage can be effectively reduced, energy consumption is reduced, and meanwhile, the high negative dielectric anisotropy liquid crystal mixture has a wide working temperature range.

The invention relates to a liquid crystal vertical alignment agent, a preparation method and application thereof. The liquid crystal vertical alignment agent has a structure as shown in general formula I. The liquid crystal vertical alignment agent of the present invention realizes the vertical alignment of liquid crystal molecules through the interaction between -OH and the surface of the substrate without the PI alignment film. The liquid crystal vertical alignment agent has low price and stable performance, can be widely used 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 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 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 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.