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The invention relates to 4,6-difluoro dibenzothiophene derivates of formula I, wherein R1, R2, A1, A2, Z1, Z2, m and n are as defined in claim 1, their preparation, their use as components in liquid-crystalline media and electro-optical display elements, which contain the novel liquid-crystalline media.

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 liquid crystal medium characterized in that it contains one or more I compounds, wherein, R0, X0 and Y1-7 have the right of requiring a meaning stated in 1, the aim of their uses in electrooptics is related, especially the application of use in TN, TFT, IPS or OCB display.

The present invention relates to the field of liquid crystal materials, and specifically discloses a liquid crystal composition containing a 1,3-dioxane compound and application of the same in a liquid crystal display device. The liquid crystal composition of the invention comprises the following components in parts by weight: 1-24 parts of one or more compounds selected from compounds represented by the formula (I), 1-80 parts of one or more compounds selected from compounds represented by the formula (II), 1-35 parts of one or more compounds selected from compounds represented by the formula (III), and 0-40 parts of one or more compounds selected from compounds represented by the formula (IV). An optical birefringence delta n of the liquid crystal composition is between 0.08 to 0.15, and has a moderate refraction range. The liquid crystal composition provided by the invention not only has characteristics like a broader nematic temperature range, a high resistivity, a high charge holding rate, and a low viscosity, but also has a faster response speed and good cryogenic storage stability. When the liquid crystal composition is applied to a liquid crystal display, particularly a display of the TFT-LCD mode, the display effect of the liquid crystal display can be improved significantly.

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 discloses a liquid crystal composition with positive dielectric anisotropy. The liquid crystal composition contains one or more compounds shown in a general formula I, one or more compounds shown in a general formula II and one or more compounds shown in a general formula III. The invention also discloses a liquid crystal display device including the liquid crystal composition disclosed by the invention. The liquid crystal composition provided by the invention has the advantages of high clearing points, good low-temperature intersolubility, quick response, low LC (Liquid Crystal)light leakage, high contrast ratio, high penetration ratio and the like, and moreover, the contrast ratio can be achieved while large dielectric, low box thickness and quick response are met at the same time; and therefore, the liquid crystal composition is particularly suitable for being used in liquid display elements driven by active matrix thin film transistors (AM-TFT). The formula (1) is shown in the description.

The invention provides a novel polymerizable liquid crystal composition comprising a first component of at least one compound represented by the general formula I, a second component of at least one compound represented by the general formula II, a third component of at least one compound represented by the general formula III, and a fourth component of at least one compound represented by the general formula IV. According to the polymerizable liquid crystal composition, polymerization speed can be controlled, polymeric compound residue can be reduced, and problems such as after-image, image display unevenness, low-temperature crystallization, and the like can be greatly reduced. The composition also has good anti-ultraviolet stability, good low-temperature storage performance, relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy. The invention also provides a liquid crystal display device comprising the polymerizable liquid crystal composition.

The invention provides a liquid crystal composition for TFT (Thin-Film Transistor) display. The liquid crystal composition is prepared from the following components in percentage by weight: 1-40 percent of I-type compound, 1-70 percent of II-type compound, 1-40 percent of III-type compound, 0-45 percent of IV-type compound and 0-20 percent of V-type compound. The liquid crystal composition has excellent performance, extremely low total response time (ttot=ton+toff), lower voltage, high resistance ratio and voltage retention ratio, and can also have different threshold voltages, clearing points and delta n characteristics by adjusting the contents of the components, thereby being particularly suitable for manufacturing rapid-response TN-TFT liquid crystal displays.

The invention discloses a positive-negative-mixed liquid crystal composition. The positive-negative-mixed liquid crystal composition is characterized by comprising a component A composed of at least one kind of negative compounds shown in the first general formula (please see the specification for the first general formula) and a component B composed of one or more kinds of positive compounds shown in the second general formula (please see the specification for the second general formula). The liquid crystal composition has the advantages of being positively dielectric, high in charge retention rate, low in rotary viscosity, short in response time and particularly high in transmittance; the positive-negative-mixed liquid crystal composition is suitable for manufacturing a high-transmittance and rapid-responding TFT-LCD.

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.

The invention belongs to the technical field of liquid-crystal compounds, and specifically relates to a negative liquid-crystal compound and a preparation method of the compound. The structural general formula of the negative liquid-crystal compound is represented as a formula I. The negative liquid-crystal compound provided by the invention contains both cyanogen and fluorine in side positions, and has stronger negative dielectric anisotropy, moderate refractive index, a comparatively high clearing point, comparatively excellent chemical stability and a comparatively excellent UV resistant ability.

The invention provides a novel polymerizable liquid crystal composition comprising a first component of at least one compound represented by the general formula I, a second component of at least one compound represented by the general formula II, a third component of at least one compound represented by the general formula III, and a fourth component of at least one compound represented by the general formula IV. According to the polymerizable liquid crystal composition, polymerization speed can be controlled, polymeric compound residues can be reduced, and risks of causing poor display problems such as after-images and image display unevenness can be greatly reduced. The invention also provides a liquid crystal display device comprising the polymerizable liquid crystal composition.

The invention relates to the technical field of liquid crystal display, and discloses a liquid crystal compound and a preparation method thereof, a liquid crystal composition and a preparation method thereof, and a liquid crystal display panel. The liquid crystal compounds has a structure as shown in P2, the compound has good physical and chemical stability and higher clearing point, the liquid crystal composition comprising the liquid crystal compound P2 also has high clearing point, and the application range of the liquid crystal display panel can be greatly expanded.

The invention discloses a dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound and a preparation method thereof. The structural general formula of the dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound is shown in the specification, wherein (F)m, (F)n and (F)x respectively represent fluorine atom substitution, m, n and x represent substitution number of the fluorine atoms and the value of m, n and x is 0 or 1, and the cyclohexyl is trans-cyclohexyl; both R and R' represent C1-C15 alkyl, C1-C15 alkenyl, C1-C15 alkoxy, C1-C15 alkenyloxy, fluoro-substituted C1-C15 alkyl or fluoro-substituted C1-C15 alkenyl. The dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound not only has high clearing point, wide nematic phase section, large birefringence, and low optical absorption coefficient, but also has low melting point, low viscosity and good intermiscibility, and can be used in liquid crystal optical elements; the dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound with side fluorine can also be used in a double frequency liquid crystal display mode.

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 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 invention discloses a liquid crystal composition with positive dielectric anisotropy. The composition comprises one or more compounds represented by a general formula I shown in the description, wherein a content of the compounds in the liquid crystal composition is >= 2 wt%; one or more compounds represented by a general formula II shown in the description, wherein a content of the compoundsin the liquid crystal composition is > 2 wt%; and one or more compounds represented by a general formula III shown in the description, wherein a content of the compounds in the liquid crystal composition is >= 11 wt%. The invention also discloses a liquid crystal display device containing the liquid crystal composition disclosed by the invention. The liquid crystal composition provided by the invention has the advantages of a high clearing point, good low-temperature intersolubility, a low driving voltage, a low cell thickness, fast response and a high penetration rate, and is suitable for a liquid crystal display element driven by an active matrix thin-film transistor (AM-TFT), and especially suitable for display elements with harsh working environments, such as on-board displays.

The invention discloses a liquid crystal composition for active matrix driven liquid crystal display. The composition contains compounds shown in formulas I-III. According to the invention, a liquid crystal composition taking a difluoromethoxy-bridge simultaneously containing cyclopentyl in molecules thereof as a connecting group is used for improving the comprehensive performance of liquid crystal compositions so as to obtain different optimal combinations for meeting the needs of different display modes, therefore, the liquid crystal composition has an important practical value.

The invention provides a negative liquid crystal composition comprising: at least one compound represented by the general formula I and used as a first ingredient; at least one compound represented by the general formula II and used as a second ingredient; and a 1-2000 ppm antistatic agent comprising at least one crown ether compound and a compound represented by the formula V. The negative liquid crystal composition can effectively reduce the current power consumption, reduce the electrostatic discharge time, and greatly reduce risks of generation of image ghost shadow, image display unevenness and other display poor problems. The invention also provides a liquid crystal display comprising the negative liquid crystal composition.

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 provides a liquid crystal compound containing a dibenzofuran ring. The liquid crystal compound has a structure as shown in the formula I in the description. The liquid crystal compound containing the dibenzofuran ring has larger dielectric anisotropy, lower rotational viscosity and higher clearing point, and the intersolubility among monomers is good, thereby being favorable for preparing a composition. A liquid crystal composition containing the liquid crystal compound has greater dielectric anisotropy, can more effectively reduce the driving voltage of a device, simultaneouslyhas lower rotational viscosity and shorter response time, has good chemical stability and thermal stability, has good application in a display device, and especially has good application in a displaydevice in a TFT mode.

The invention relates to a liquid crystal composition, a liquid crystal display element and a liquid crystal display. The liquid crystal composition comprises one or more compounds represented by a formula I, one or more compounds represented by a formula II, and one or more compounds represented by a formula III, wherein each of R1, R2, R3 and R4 independently represents an alkyl group having 1-10 carbon atoms, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, a fluorine-substituted alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, a fluorine-substituted alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 3-8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3-8 carbon atoms;each of R and R' represents a cyclopropyl group, a cyclopentyl group or a 2-tetrahydrofuranyl group; each of a ring A and a ring B independently represents a 1,4-phenylene group or a 1,4-cyclohexylenegroup. The liquid crystal composition is especially suitable for active matrix displays, especially displays based on VA, PSA, PA-VA, SS-VA, SA-VA, PS-VA, PALC, IPS, PS-IPS, FFS or PS-FFS effects.

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 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 which comprises at least one compound disclosed as general formula I as a first component, at least one compound disclosed as general formula II as a second component, at least one compound disclosed as general formula III as a third component, and at least one compound disclosed as general formula IV as a fourth component. The liquid crystal composition can control the polymerization rate, lower the polymer compound residues and greatly reduce the risks of display defectiveness problems, such as image ghost, nonuniform image display and the like. The invention also provides a liquid crystal display device comprising the liquid crystal composition.

The invention discloses a liquid crystal display device. The liquid crystal display device comprises an upper polarizer, an upper substrate, an upper electrode layer, an upper alignment layer, a liquid crystal layer, a lower alignment layer, a lower electrode layer, a lower substrate, and a lower polarizer. The liquid crystal layer contains a liquid crystal composition having the negative dielectric anisotropy. The liquid crystal composition contains at least one or more compounds of the formula I. The VA type liquid crystal display device provided by the invention has the characteristics of wide viewing angle and high contrast, and also has the advantages of fast response and good performance in low-temperature storage. Further, the liquid crystal composition in the liquid crystal displaydevice of the invention also has a high clearing point and a low dielectric anisotropy, which is beneficial to reduce the driving voltage of the liquid crystal display device and reduce the power consumption.

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 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 disclosed by the invention comprises at least one compound shown as formula I served as an additive and one or more compound shown as formula II. The liquid crystal compound has higher clearing point (CP), appropriate optical anisotropism (delta n), high response speed, high ultraviolet stability and high thermal stability.