155results about How to "Wide Nematic Temperature Range" patented technology

The invention discloses a positive dielectric anisotropy liquid crystal combination with rapid response. The positive dielectric anisotropy liquid crystal combination comprises 5-60 percent of first component, 1-50 percent of second component, 1-40 percent of third component, 0-40 percent of fourth component and an optically active compound, wherein the first component is formed from compounds with a structural formula I and a structural formula II, a compound with a structural formula III is used as the second component, a compound with a structural formula VI is used as the third component, a compound with a structural formula V is used as the fourth component, and the mass of the optically active compound is 0-0.2 percent of the mass sum of the liquid crystal combination. The liquid crystal combination has high charge retention, larger positive dielectric anisotropy, higher clearing point, good low-temperature stability, lower rotary viscometer and higher response speed and is particularly suitable for manufacturing active matrixes TN-TFT(Twisted Nematic-Thin Film Transistor), IPS (In-Plane Switching)-TFT liquid crystal display elements and liquid crystal displays.

The invention disclosed a liquid crystal composition, which contains one or a plurality of compounds represented by a formula I-a and / or I-b, one or a plurality of compounds represented by a formula II, and one or a plurality of compounds represented by a formula III, wherein the formulas I-a, I-b, II and III are defined in the specification. A purpose of the present invention is to provide a liquid crystal composition and a liquid crystal display element or a liquid crystal display device containing the liquid crystal composition. According to the present invention, the liquid crystal composition has low viscosity, can achieve fast response, and further has moderate dielectric anisotropy delta[epsilon], moderate optical anisotropy delta[n], high thermal stability and high light stability;and the liquid crystal display element or the liquid crystal display device containing the liquid crystal composition has advantages of wide nematic phase temperature range, suitable birefringence anisotropy, high resistivity, good ultraviolet resistance, high charge retention, low vapor pressure and the like.

The invention discloses a positive dielectric-aeolotropic liquid crystal composition with fast response. The positive dielectric-aeolotropic liquid crystal composition comprises the following components in percentage by weight: 1%-40% of a liquid crystal compound shown in a structural formula I, 1%-40% of a liquid crystal compound shown in a structural formula II, 1%-40% of a liquid crystal compound shown in a structural formula III, 0%-70% of a liquid crystal compound shown in a structural formula IV, 0%-70% of a liquid crystal compound shown in a structural formula V, 0%-40% of a liquid crystal compound shown in a structural formula VI, and 0%-40% of a liquid crystal compound shown in a structural formula VII; in addition, an optical rotation compound with the weight of being 0%-0.5% of the total weight of all the liquid crystal compounds is added. The liquid crystal composition disclosed by the invention is low in power consumption, low in rotary viscosity and high in response speed, and is especially applicable for manufacturing a TFT-LCD Thin Film Transistor-Liquid Crystal Display) with fast response.

The invention discloses a liquid crystal composition which contains compounds shown in formulae I and II and also can contain one or more compounds shown in formula II-B, wherein the definitions of all substituents are given. The composition disclosed by the invention has low viscosity gamma 1, moderate dielectric anisotropy delta epsilon and moderate optical anisotropy delta n and can realize quick response of liquid crystal display.

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 present invention discloses a liquid crystal composition having rapid response, wherein the liquid crystal composition comprises one or a plurality of compounds represented by a general formula I, one or a plurality of compounds represented by a general formula II, one or a plurality of compounds represented by general formulas III-1, III-2 and III-3 or a composition of the compounds represented by general formulas III-1, III-2 and III-3. According to the present invention, the liquid crystal composition has characteristics of suitable optical anisotropy, suitable dielectric anisotropy, high clearing point, rapid response, wide work temperature range and the like, and can be used for liquid crystal displays, particularly the liquid crystal display having the rapid response requirement.

The present invention provides a liquid crystal composition, which contains one or a plurality of compounds represented by a formula I and one or a plurality of compounds represented by a formula II,wherein the formulas I and II are defined in the specification. According to the present invention, the liquid crystal composition has low viscosity, can achieve fast response, and further has moderate dielectric anisotropy delta[epsilon], moderate optical anisotropy delta[n], high thermal stability and high light stability; and the liquid crystal display element or the liquid crystal display device containing the liquid crystal composition has advantages of wide nematic phase temperature range, suitable birefringence anisotropy, high resistivity, good ultraviolet resistance, high charge retention, low vapor pressure and the like.

The invention discloses a liquid crystal composition. The liquid crystal composition comprises one or more compounds shown in the formula I and one or more compounds shown in the formula II, and at least further comprises one or more compounds shown in the formula II-B contained in the formula II, wherein the formula I, the formula II and the formula II-B are shown in the description, and all substituent groups are defined. The liquid crystal composition has low viscosity gamma 1, moderate dielectric anisotropy delta epsilon and moderate optical anisotropism delta n, and quick response of liquid crystal displaying can be achieved.

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 an indene derivative which can be used as a component of a liquid crystal medium and has a general formula (I), a preparation method thereof and an application thereof. Above compound is a negative liquid crystal compound, has the characteristics of high dielectric property, optical anisotropy and clearing point, and wide nematic phase temperature range, and makes displays using the compound have the advantages of fast response speed and wide working range, and well display in various environments. The invention also provides one or more liquid crystal compositions containing the compound, and liquid crystal elements containing the liquid crystal composition(s).

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 a quick-responsive liquid crystal composition which comprises 50-60wt% of a component A, 1-50wt% of a component B, 1-40wt% of a component C and 0-40wt% of a component D, wherein the compound in formula I in the component A accounts for 1-50wt% of the liquid crystal composition, and the compound in formula II in the component A accounts for 1-50wt% of the liquid crystal composition; the sum of the weight percentage of A, B, C and D is 100%; in addition, 0-0.2% of a component with optical activity based on weight of the liquid crystal composition is further added. The composition has low rotary viscosity, high response speed and appropriate positive dielectric anisotropy, and is particularly applicable to active matrixes TN-TFT (Twisted Nematic-Thin Film Transistor) and IPS-TFT (In-Plane Switching-Thin Film Transistor) liquid crystal display elements and liquid crystal displays quick to respond.

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 invention discloses a low-viscosity low-threshold negative liquid crystal composition which comprises 1-50% of at least one compound shown as general formula I in percentage by mass, wherein R1 and R2 are one of C2-5 alkyl chain, C2-5 alkoxy and C2-5 alkenyl chain of which an olefinic bond is not directly connected with an oxygen atom or benzene ring. The liquid crystal composition has large and negative dielectric constant, low threshold voltage and viscosity, wide nematic phase temperature range, favorable compatibility, favorable ultraviolet resistance and high temperature resistance, and is applicable to VA (vertical alignment) mode liquid crystal displays having requirements for high response speed and low power consumption.

The invention discloses a liquid crystal composition, which has the characteristics of high optical anisotropy, wide nematic phase temperature range, high specific resistance, high stability, low viscosity, and so on. The liquid crystal composition also has rapid response speed, and can well adapt to display elements driven by an active matrix thin-film transistor (AM-TFT). The liquid crystal composition comprises four compounds of general formulas I, II, III and IV, and also comprises compounds of general formulas V-VII. The one or more compounds in the formulas I, II, III and IV as well as formulas V-VII are 10-70wt%, 1-40wt%, 1-40wt%, 1-40wt%, and 0-40wt% respectively. The optical anisotropy value deltan of the liquid crystal composition disclosed by the invention is within 0.12-0.15.

The invention discloses a quick-response nematic phase type liquid crystal composite. The liquid crystal composite comprises 1%-40% (mass percentage) of liquid crystal compound as shown in structural formula I, 5%-70% (mass percentage) of liquid crystal compound as shown in structural formula II, 5%-50% (mass percentage) of liquid crystal compound as shown in structural formula III, 0%-40% (mass percentage) of liquid crystal compound as shown in structural formula IV, and 0%-40% (mass percentage) of liquid crystal compound as shown in structural formula V; the sum of mass percentages of the liquid crystal compounds respectively as shown in structural formulae I, II, III, IV and V is 100%; moreover, an optically active compound occupying 0%-0.5% of the sum of mass of the liquid crystal composite is also added. The composite has low rotary viscosity, quick response speed and proper positive dielectric anisotropy, and is especially suitable for manufacturing quick-response active matrix TN-TFT and IPS-TFT liquid crystal display elements and liquid crystal displayers.

The invention discloses a liquid crystal composition. The liquid crystal composition comprises one or more compounds as shown in formula I and one or more compounds as shown in formula II; and the liquid crystal composition comprises a compound as shown in II-A: FORMULA as shown in the specification, wherein each substituent group is defined. The composition provided by the invention has low viscosity gamma 1, moderate dielectric anisotropy delta epsilon and moderate optical anisotropy delta n, and can realize quick response of liquid crystal display.

The invention relates to a dibenzothiophene polymerizable compound and an application thereof. The compound has a structure as shown in a general formula I. Compared with the prior art, the polymerizable liquid crystal compound disclosed by the invention has good solubility and a better alignment effect, the polymerization rate is higher, polymerization is more complete, and the residue amount islower, so that the problem of poor display is improved to a large extent. Furthermore, a liquid crystal composition containing the compound has relatively low viscosity, can realize rapid response andhas moderate dielectric anisotropy delta epsilon. A liquid crystal display element or liquid crystal display comprising the liquid crystal composition has a wide nematic phase temperature range, suitable or relatively high birefringence anisotropy delta n, higher electrical resistivity, good ultraviolet resistance, high charge retention rate, low steam pressure and the like.

The invention discloses a liquid crystal composition.The liquid crystal composition contains one or more types of compounds as indicated in formula (I) and one or more types of compounds as indicated in formula (II) as well as one or more types of compounds as indicated in formula (II-B) in formula (II), wherein the definition of each substituent group is given.The composition has low viscosity gamma 1, moderate dielectric anisotropy delta epsilon and moderate optical anisotropy delta n and can achieve rapid response to liquid crystal display.

The invention discloses compounds containing 1,2-difluoroethylene and difluoromethylene ether structure, and preparation and application thereof. The invention relates to compounds having the structural formula (I) and a preparation method thereof. In the structural formula, R refers to alkyl or alkenyl with 1 to 15 carbon atoms, or alkoxy or allyloxy with 1 to 15 carbon atoms; ring A refers to trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl, pyridine-2,5-diyl, pyrimidine-2,5-diylphenylene or 1,4-phenylene substituted or not substituted by one or more fluorine atoms; Z refers to a single bond, -CH2CH2-, -CH=CH-, carbon-carbon triple bond, -OCH2-, -CH2O-, -OCF2-, -CF2O-, -CF2CF2-, -CF=CF-, -OCO- or -COO-; L1, L2, L3, L4, L5, L6, L7 and L8 respectively independently refer to a hydrogen atom or a halogen atom; X refers to -H, -CN, -F, -Cl, -OCF3, -OCF2H or -CF3; and m refers to 0 or 1. The invention also relates to use of the compounds as a component of a liquid crystal medium, liquid crystal and an electro-optical display element containing the liquid crystal medium.

The invention discloses a liquid crystal composition which comprises one or more compounds shown in a formula I and one or more compounds shown in a formula II, and the liquid crystal composition comprises compounds shown in a formula II-A shown in the description, wherein the substituents are defined. The composition disclosed by the invention has low viscosity gamma 1, moderate dielectric anisotropy deltaepsilon, moderate or relatively great optical anisotropy deltan, and can be used for realizing quick response of liquid crystal display.

The invention discloses a nematic liquid crystal composition. The nematic liquid crystal composition contains one or more compounds represented by a structural general formula (1) shown in descriptions, wherein R is C1-9 straight-chain alkane. The nematic liquid crystal composition has the characteristics of wide liquid crystal phase region, good low-temperature storage performance, high dielectric anisotropy and good photo-thermal stability, is applicable to TFT (Thin Film Transistor) liquid crystal display and particularly is applicable to liquid crystal display modes, such as IPS, FFS, TN and OCB. A liquid crystal display element which has the advantages of wide operating temperature range, short response time and high reliability is provided.

The invention discloses a liquid crystal composition. The liquid crystal composition comprises one or more compounds as shown in formula I and one or more compounds as shown in formula II; and the liquid crystal composition comprises a compound as shown in II-A: FORMULA as shown in the specification, wherein each substituent group is defined. The composition disclosed by the invention has low viscosity gamma 1, moderate dielectric anisotropy delta epsilon and moderate optical anisotropy delta n, and can realize quick response of liquid crystal display.

The invention discloses a liquid crystal composition, and a liquid crystal display element or display thereof. The liquid crystal composition contains a compound represented by general formula I, a compound represented by general formula II, and a compound represented by general formula III; and in the general formula I, the general formula II and the general formula III, R1 and R3 are C2-5 linear alkyl groups, R2 represents a C2-5 linear alkyl group or a C2-5 alkenyl group, R4 represents H or a C1-3 linear alkyl group, and X1 and X2 represent H or F. The liquid crystal composition has the advantages of fast response speed, large dielectric anisotropy, moderate optical anisotropy and good light and heat stability, and is especially suitable for being used in IPS liquid crystal display devices.

The invention discloses a liquid crystal composition. The liquid crystal composition comprises one or more types of compounds shown as formula I and one or more types of compounds shown as formula II; the liquid crystal composition comprises a compound shown as formula II-B in one or two types of compounds shown as the formula II of the description, wherein each substituent group is defined. The composition provided by the invention has low viscosity gamma1, moderate dielectric anisotropy deltaepsilon and moderate optical anisotropy deltan, and can realize rapid response of liquid crystal display.

The invention relates to a liquid crystal compound, a liquid crystal display element including the liquid crystal compound and a liquid crystal display and belongs to the field of liquid crystal display. The liquid crystal compound provided by the invention comprises one or more compound shown as formula I and one or more compound selected from a group composed of compounds shown as formula II A,formula II B and formula II C. The liquid crystal compound is capable of improving incidental image defect and has excellent ultraviolet resistance, high temperature resistance, lower threshold voltage, moderate optical anisotropism, lower rotary viscosity and excellent low-temperature solubility.

The invention discloses a positive dielectric anisotropic liquid crystal composition which comprises the following components in percentage by weight: 1 to 40 percent of liquid crystal compound shown as a structural formula I, 1 to 40 percent of liquid crystal compound shown as a structural formula II, 1 to 60 percent of liquid crystal compound shown as a structural formula III, 1 to 60 percent of liquid crystal compound shown as a structural formula IV, 0 to 20 percent of liquid crystal compound shown as a structural formula V and 0 to 20 percent of liquid crystal compound shown as a structural formula VI, wherein the sum of the weight percentage of the liquid crystal compounds shown as the structural formulas I, II, III, IV, V and VI is 100 percent; an optical rotation compound in an amount which is 0 to 0.2 percent of the total weight of the liquid crystal composition is also added. The liquid crystal composition has low power consumption, low rotary viscosity and high response speed, and is particularly suitable for manufacturing a thin film transistor-liquid crystal display (TFT-LCD) with quick response.

The invention discloses a liquid crystal composition with negative dielectric anisotropy, which is good in low temperature stability and high in response speed. The liquid crystal composition contains: one or more compounds as shown in general formula I-1 and / or I-2, which account for 20-65% of the total weight of a negative liquid crystal composition; one or more compounds as shown in a general formula II, which account for 8-25% of the total weight of the negative liquid crystal composition; one or more compounds as shown in general formula III, which account for 6-25% of the total weight ofthe negative liquid crystal composition; and one or more compounds as shown in general formula IV, which account for 30-60% of the total weight of the negative liquid crystal composition. The invention also discloses a liquid crystal display device comprising the liquid crystal composition. The formulae are as shown in the specification.