204results about How to "Large dielectric anisotropy" patented technology

A liquid crystal composition having a nematic phase that includes a compound represented by Formula (1), a compound represented by Formulas (2-1) and (2-2), and a compound represented by Formulas (3-1) and (3-2), and a liquid crystal display device containing the composition:wherein, for example, R1 is alkenyl having approximately 2 to approximately 12 carbons; R2 is alkyl having approximately 1 to approximately 12 carbons; Y1 is fluorine or chlorine; Y2 is fluorine or trifluoromethoxy; X1 and X2 are each independently hydrogen or fluorine; and Z1 and Z2 are each independently a single bond or —CH2CH2—.

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 problem is to provide a liquid crystal compound satisfying at least one physical property such as high stability to heat and light, high clearing point, low minimum temperature of liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, suitable elastic constant and excellent compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition.The compound is represented by formula (1).In formula (1), for example, R1 is alkenyl; ring A1 and ring A2 are 1,4-cyclohexylene or 1,4-phenylene; Z1, Z2, Z3 are a single bond or —COO—; X1 is hydrogen or fluorine; L1, L2, L3 and L4 are hydrogen or fluorine; and a and b are each independently 0 or 1, a sum of a and b is 1, and when a is 1, at least one of ring A1 and ring A2 is 1,4-cyclohexylene.

To provide a liquid crystal compound having a high stability to light, a high clearing point, a low minimum temperature of a liquid crystal phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant and an excellent solubility in other liquid crystal compounds. The invention concerns a compound represented by formula (1), a liquid crystal composition containing the compound and a liquid crystal display device including the composition:

Provided are: a liquid-crystalline compound which satisfies at least one property selected from high stability to light, a high clear point, a low lower-limit temperature of a liquid crystal phase, a low viscosity, proper optical anisotropy, high dielectric anisotropy, a high dielectric constant in a short axis direction, a proper elastic constant, excellent compatibility and the like; a liquid crystal composition which contains the compound; and a liquid crystal display element comprising the composition. A compound represented by formula (1). For example, R1 represents an alkyl group having 1 to 15 carbon atoms, rings A1 to A4 independently represent 1,4-cyclohexylene or 1,4-phenylene, Z1 to Z4 independently represent a single bond, -(CH2)2-, -COO- or -CH2O-, X1 represents a halogen atom, -C≡N, -CF3 or -OCF3, L1 and L2 independently represent a hydrogen atom or a fluorine atom, Y1 and Y2 independently represent a fluorine atom, and a, b, c and d independently represent 0 or 1 wherein the sum total of a, b, c and d is 1 or 2.

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 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 compound having high stability to heat, light and so forth, a high clearing point, a low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, a suitable elastic constant and excellent compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition. The compound is represented by formula (1-1):wherein, for example, R1 is hydrogen, halogen or alkyl having 1 to 20 carbons; ring A1, ring A2, ring A3, ring A4 and ring A5 are independently 1,4-cyclohexylene or 1,4-phenylene; Z1, Z2, Z3 and Z4 are independently a single bond, —(CH2)2—, —CH═CH— or —CF═CF—: and a, b, c and d are independently 0 or 1, and a sum of a, b, c and d is one or more.

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.

To provide a liquid crystal compound satisfying at least one of physical properties such as high stability to light, a high clearing point, low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, a suitable elastic constant, excellent compatibility with other liquid crystal compounds and a large dielectric constant in a minor axis direction.The compound is represented by formula (1).For example, R1 is alkyl having 1 to 15 carbons; rings A1 to A4 are 1,4-cyclohexylene or 1,4-phenylene; W1 is a group represented by formula (1a) or (1b);W2 is a group represented by formula (1c) or (1d);Y1 to Y5 and L1 to L5 are fluorine; Z1 to Z5 are —(CH2)2— or —OCH2—; X1 is fluorine, —CF3 or —OCF3; and a to d are 0 or 1, and a sum of a to d is 3 or less.

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 discloses a liquid crystal composition capable of rapidly responding to cyclo-butylbenzene difluoromethoxy. The liquid crystal composition comprises 1-40% of compounds shown as the general formula I, 1-70% of compounds shown as the general formula II, 1-55% of compounds shown as the general formula III, 0-40% of compounds shown as the general formula IV and 0-40% of compounds shown as the general formula V. The liquid crystal composition has the advantages of wide nematic phase temperature range, proper dielectric anisotropy, proper optical anisotropy, high charge retention rate, short response time and low rotary viscosity, and is suitable for manufacturing active matrix TN-TFT (Twisted Nematic-Thin Film Transistor), IPS-TFT (Intrusion Prevention System-Thin Film Transistor) displays (I), (II), (III), (IV) and (V) capable of realizing rapid response.

An object is to provide a liquid crystal compound satisfying at least one of physical properties such as a high stability to heat and light, a high clearing point, a low minimum temperature of a liquid crystal phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant and an excellent compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition. A solution is a compound represented by formula (1).In formula 1,R1 is alkyl having 1 to 10 carbons, for example; ring A1 and ring A2 are independently 1,4-cyclohexylene or 1,4-phenylene; Z1 and Z2 are independently a single bond or —CF2O—; L1 and L2 are halogen; and a is 1 or 2.

A liquid crystal composition having a nematic phase that includes a compound represented by Formula (1), a compound represented by Formulas (2-1) and (2-2), and a compound represented by Formulas (3-1) and (3-2), and a liquid crystal display device containing the composition:wherein, for example, R1 is alkenyl having approximately 2 to approximately 12 carbons; R2 is alkyl having approximately 1 to approximately 12 carbons; Y1 is fluorine or chlorine; Y2 is fluorine or trifluoromethoxy; X1 and X2 are each independently hydrogen or fluorine; and Z1 and Z2 are each independently a single bond or —CH2CH2—.

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 compound for a liquid crystal medium component. The compound is shown in the structure formula described in the specification. The liquid crystal composition containing the compound has the advantages of short response time, moderate delta n, high charge retention rate, low threshold voltage and wide application prospect.

The invention discloses a fluorine-containing biphenyl acetylene liquid crystal compound and a preparation method thereof. The structural general formula of the compound is shown as (1) in the specification, wherein R is straight-chain alkane with the number of carbons being 1-9, X1, X2, X3 and X4 are H or F, and at least one of X3 and X4 is F. The fluorine-containing biphenyl acetylene liquid crystal compound has the advantages of being high in birefringence, low in melting point and viscosity, and large in dielectric anisotropy, and is suitable for the application fields of liquid crystal display, laser communication and the like.

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.

Provided is a liquid crystal compound satisfying at least one of physical properties such as high stability to heat, light or the like, a high clearing point, low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy and large dielectric anisotropy, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition.A compound is represented by formula (1).In formula (1), for example,R1 is alkyl having 1 to 12 carbons;ring A1, ring A2 and ring A3 are independentlyin which, X1 and X2 are independently —O— or —CH2—;Y1 is fluorine, —CF3 or —OCF3;Z1 and Z3 are independently a single bond, —CF2O— or —COO—;Z2 is a single bond, —CF2O— or —COO—;L1 and L2 are independently hydrogen or halogen;a is 0, 1, 2 or 3; andn1 and n2 are independently 0, 1 or 2.

The invention relates to a liquid crystal composition with high transmittance and application thereof. The liquid crystal composition consists of compounds represented by general formula I to general formula V. The structures of general formula I and general formula II are as follows. The epsilon< / / > / epsilon is perpendicular to (the ratio of a parallel dielectric to a vertical dielectric) of the liquid crystal composition provided by the invention is effectively decreased, and thereby a good effect of increasing transmittance is achieved. To be exact, the liquid crystal composition provided by the invention has a large vertical dielectric, and thereby has high transmittance.

The invention provides a novel liquid crystal compound of formula (I) containing difluoro ethylene diether. The liquid crystal compound disclosed herein has good chemical and physical stability and low birefringence, and a negative liquid crystal monomer and a liquid crystal composition which contain the structure have large dielectric anisotropy and low driving voltage. The invention further provides a liquid crystal composition of one or more liquid crystal compounds. The liquid crystal composition has good low temperature intersolubility, low birefringence and fast response time, and can be applied in liquid crystal elements containing the liquid crystal medium, especially in liquid crystal display elements containing the negative liquid crystal medium.

The invention discloses a liquid crystal compound and a preparation method and application thereof. The liquid crystal compound has the structural formula shown in the specifications; and the compound is stable in structure and property, and has the characteristics of high intersolubility, high ultraviolet resistance property, high charge retention rate, and high dielectric anisotropy. When the liquid crystal compound is applied to a liquid crystal composition, threshold voltage can be reduced, the delta n value of a system can be adjusted, and the comprehensive performance of the liquid crystal composition can be improved.

The invention provides a liquid crystal composition having good light and heat stability. The liquid crystal composition is prepared from a compound accounting for 5-30% of the total weight of the liquid crystal composition and shown by one or more general formulas I, a compound accounting for 1-30% of the total weight of the liquid crystal composition and shown by one or more general formulas II, a compound accounting for 1-30% of the total weight of the liquid crystal composition and shown by one or more general formulas III, a compound accounting for 1-20% of the total weight of the liquid crystal composition and shown by one or more general formulas IV-1 and IV-2 and a compound accounting for 15-50% of the total weight of the liquid crystal composition and shown by one or more general formulas V, and the liquid crystal composition has large dielectric anisotropy, appropriate high optical anisotropy, low viscosity and good light and heat stability and is suitable for liquid crystal display devices. The invention further provides the liquid crystal display device containing the liquid crystal composition.

The invention relates to a pentafluoropropylene ether liquid crystal compound as well as a preparation method and application thereof. The liquid crystal compound has a structural formula as shown in a formula I. The novel pentafluoropropylene ether liquid crystal compound provided by the invention is stable in structure and properties and has the characteristics of good intersolubility, good ultraviolet resistance, high charge retention rate and large dielectric anisotropy; after the liquid crystal compound is applied to a liquid crystal composition, the threshold voltage can be reduced, the delta n value of a system can be increased, the response speed can be increased, and the comprehensive performance of the liquid crystal composition can be improved. Therefore, the liquid crystal compound has huge application prospect and economic value. (The structural formula as shown in the Specification).

The invention discloses a nematic-phase liquid crystal composition. The nematic-phase liquid crystal composition comprises one or more compounds as shown in a structure general formula (1): the structure general formula (1) is as shown in the description, wherein R is a linear chain alkyl, an alkenyl, and an alkoxy of which a carbon number is 1-9; and X1-X4 is a methyl, a helium atom, a fluorine atom or a hydrogen atom, and at least one of the X1-X4 is the methyl or the helium atom. The nematic-phase liquid crystal composition has the characteristics of high environmental suitability and a wide liquid crystal phase area, and is suitable for TFT liquid crystal display, especially liquid crystal display modes of TN, IPS, FFS, OCB, a blue phase and the like.

The present invention relates to a nematic liquid crystal compound and applications thereof. The structure of the liquid crystal compound contains an isopropane bridge bond. The nematic liquid crystal compound of the present invention has characteristics of stable structure, stable properties, good intersolubility, low viscosity, and large dielectric anisotropy, and can be applied in a TFT liquid crystal mode.