194results about How to "Good miscibility at low temperature" patented technology

The invention discloses a liquid crystal composition containing 2-methyl-3,4,5-trifluorophenyl liquid crystal compound and an application thereof. The liquid crystal composition disclosed by the invention comprises the following components in parts by weight: (1) 1-80 parts of one or a plurality of compounds of the general formula I, and (2) 10-70 parts of one or a plurality of compounds of the general formula II. The liquid crystal composition provided by the invention is a nematic liquid crystal composition, and has low rotary viscosity, large elastic constant and fast response speed.

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 relates to a liquid crystal composition with a stable threshold voltage and an application thereof. The liquid crystal composition comprises the following components: (1) 5%-40% of a compounds shown in a general formula I; (2) 10%-40% of a compound shown in a general formula II; compounds with a dioxyheterocycle structure are taken as polar ingredients of the liquid crystal composition to overcome the defect that the photoelectric characteristic of the liquid crystal composition changes with frequency; the polar ingredients composed of compound type I having a difluoromethoxyl structure and the compound type II having a 3,4,5-trifluoro-benzene structure are used together for regulating the voltage temperature stability of the liquid crystal composition, so that the voltage characteristic of the liquid crystal composition does not change with the temperatures, and therefore the display effect of the liquid crystal composition is improved.

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 discloses a dielectric positive liquid crystal composition which comprises 1%-4% of a dielectric positive compound of a first dielectric positive component A shown in a general formula I, 1%-50% of a second dielectric positive component B comprising a dielectric positive compound shown in a general formula II and/or a dielectric positive compound shown in a general formula III, and 10%-80% of a dielectric neutral compound of a dielectric neutral component C shown in a general formula IV, and in addition, an optically active compound accounting for 0-0.5% of the mass sum of the liquid crystal composition is added. The dielectric positive liquid crystal composition has the characteristics of low viscosity, short response time, proper optical anisotropy and dielectric anisotropy and excellent high temperature resistance, and is particularly suitable for manufacturing of active matrix TN-TFT (twisted nematic-thin film transistor), IPS-TFT (in-plane switching-thin film transistor) or FFS (fringe field switching) liquid crystal display elements and liquid crystal displays with quick response.

The present invention provides one novel kind of 3, 7-disubstituted trans-dicyclo[3, 3, 0] octane compound and its preparation process and the application in liquid crystal composition. The compound has stable structure, stable property, excellent low temperature intersolubility, relatively low viscosity and short response time. It may be used in liquid crystal composition and the liquid crystal composition has low power consumption, low viscosity and short response time. It has excellent application foreground in TN, STN, HTN, TFT, FMLCD whole wavelength cholest LCD display.

The invention relates to the field of liquid crystal materials, in particular to a positive and negative mixed liquid crystal combination and application thereof. The combination at least comprises a compound represented by a general formula I and at least comprises a compound represented by a general formula II. The liquid crystal combination has the characteristics of low viscosity, high resistivity, good low-temperature solubility, high response speed and excellent transmittance and can be used for fast response liquid crystal display of various display modes. At present, FFS and IPS become the most mainstream display modes, but the problem of low transmittance of FFS and IPS becomes a key problem to be solved; through experiments, it is found that the liquid crystal combination with large vertical dielectrics has high transmittance, and therefore the effect of improving brightness without increasing electric energy consumption can be achieved. The liquid crystal combination has the large vertical dielectrics, so that the transmittance characteristic of a liquid crystal display can be effectively improved, especially in displays of FFS and IPS display modes. The formulas are shown in the description.

The invention provides compounds of a formula (I) containing saturated indene rings, wherein one of A1 and A6 rings is a radical of formula (I), and m, n, p and s each independently represent 0, 1 or 2, and m+n+p+s=> 0. The compounds are provided with good chemical and physical stability and low birefringence. The invention also provides a liquid crystal composition constituted by one or more of said compounds. The liquid crystal composition has characteristics of good low-temperature intersolubility and small birefringence, and is applicable to mixed crystal systems with small birefringence such as TN, TFT, VA and FFS, especially ECB and IPS display modes.

The invention discloses a difluoromethoxy ether-containing positive dielectric liquid crystal composition which comprises the following ingredients in percentage by weight: 1%-60% of component A shown in general formulas I and II and including dielectric positive compounds, 1%-60% of component B shown in the general formula IV and including a dielectric positive compound or shown in general formulas III and IV and including dielectric positive compounds, and 10%-80% of component C dielectric neutral compound shown in the general formula V, in addition, an optical activity compound is added in difluoromethoxy ether-containing positive dielectric liquid crystal composition and takes up 0-0.5% of mass sum of the liquid crystal composition. The difluoromethoxy ether-containing positive dielectric liquid crystal composition has characteristics of being low in viscosity, fast in response time, proper in optical aeolotropism and dielectric aeolotropism, and excellent in high temperature resistance property, is especially applicable to manufacture of fast responded active matrix TN-TFT (Twisted Nematic-Thin Film Transistor), IPS (In-Plane Switching)-TFT or FFS (Fringe Field Switching) liquid crystal display elements and liquid crystal displays.

The invention relates to a liquid crystal composition containing a compound with a dioxygen heterocyclic structure and an application of the liquid crystal composition. The liquid crystal composition at least contains the compound as shown in the general formula (I). The liquid crystal composition provided by the invention is low in viscosity, high in electrical resistivity, good in low-temperature intersolubility, high in response speed, excellent in voltage and temperature stability and capable of remarkably improving the display effect of a liquid crystal display when used in a display in a TN (Twist Nematic), IPS (In-Plane Switching) or FFS (Fringe Field Switching) mode.

The invention discloses a liquid crystal composition and an application thereof. The liquid crystal composition comprises at least one compound of formula I, and at least one compound of formula II. The liquid crystal composition provided by the present invention has suitable optical anisotropy and has a relatively large elastic constants K11 and K33 while a relatively high clearing point, relatively low dielectric anisotropy, and good low-temperature mutual solubility are maintained. When the liquid crystal composition is applied to a liquid crystal display, the liquid crystal composition canhave the advantages of fast response, high contrast, large temperature width and the like.

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 relates to a negative dielectric anisotropic liquid crystal composition or rather a negative dielectric anisotropic liquid crystal composition containing one or more dichlorobicyclohexyl compounds and an application thereof. The composition is mainly used for electrooptical adjustment and is especially suitable for FFS (fringe field switching) displays, IPS (in-plane switching) displays and MVA (multi-domain vertical alignment)/PVA (patterned vertical alignment)/PSVA (polymer-stabilized vertical alignment) configuration VA (vertical alignment) type displays. The liquid crystal composition provided by the invention has high optical anisotropy, excellent low-temperature intersolubility and good high temperature and UV (ultraviolet) stability, and is suitable for fast response display devices in various display modes. The defect of relatively low optical anisotropy is overcome, the optical anisotropy of the composition is effectively improved, and the thickness of the liquid crystal layer is reduced, thereby increasing the response speed of the liquid crystal displays. Applied to the liquid crystal display devices, the liquid crystal composition can obviously solve the problem of slow response of the devices and has huge application prospects and market values.

The invention relates to a quick-response liquid crystal composition with negative dielectric anisotropy as well as an application thereof. The quick-response liquid crystal composition with negative dielectric anisotropy provided by the invention has great optical anisotropy and excellent low-temperature intersolubility as well as good high-temperature and UV (Ultraviolet) stability and is suitable for quick-response display devices with various display modes. The quick-response liquid crystal composition with negative dielectric anisotropy overcomes the defect of smaller optical anisotropy, the optical anisotropy of the composition is effectively enhanced, and the thickness of the liquid crystal layer is reduced, so that the response speed of the liquid crystal display is accelerated. The quick-response liquid crystal composition with negative dielectric anisotropy applied to the liquid crystal device can remarkably improve the problem that the liquid crystal display is slow in response and has huge application prospect and market value.

The invention provides a liquid crystal composition with the high reliability and application thereof. The liquid crystal composition is prepared from, by weight, 5-40 parts of a compound represented by the general formula I (the formula is shown in the description), 20-70 parts of a compound represented by the general formula II (the formula is shown in the description), 1-40 parts of a compound represented by the general formula III (the formula is shown in the description) and 0-30 parts of a compound represented by the general formula IV (the formula is shown in the description). The liquid crystal composition has the high voltage holding ratio, the low ion concentration, the excellent light stability, the appropriate optical anisotropy, the good low-temperature intersolubility, the high elastic constant and the good thermal stability and can effectively solve the reliability problem of a liquid crystal display, effectively solve the residual image problem of the liquid crystal display, improve the display quality of the liquid crystal display and prolong the service life of the liquid crystal display. Therefore, the liquid crystal composition is suitable for high-reliability TN, IPS and FFS type TFT liquid crystal display devices and especially suitable for IPS and FFS type liquid crystal display devices.

The invention provides a liquid crystal medium prepared from a compound containing dioxygen heterocyclic rings and 2-methyl-3,4,5-trifluoro-henyl. The liquid crystal medium has the low viscosity, the high resistance rate, the good low-temperature intersolubility, the high response speed and the excellent transmittance characteristic and can be applied to fast-response liquid crystal displaying in multiple display modes. The liquid crystal medium effectively increases the vertical dielectric, effectively improves the transmittance characteristic of a liquid crystal display, has the very low rotary viscosity gamma 1 and the high elastic constant and response speed and is suitable for a TN mode, an IPS mode and an FFS mode and especially suitable for various application of the IPS mode and the FFS mode.

The invention relates to a negative dielectric nematic liquid crystal composition. The composition comprises at least one compound represented by a formula I, at least one compound represented by a formula II and at least one compound represented by a formula III, wherein the compound represented by the formula I is a 2,3-difluorobenzen-containing tricyclic compound which has high negative dielectric anisotropy and a high clearing point, the compound represented by the formula II is a dicyclic liquid crystal compound containing a methoxy bridge bond and a 2,3-difluorobenzene structure, and hashigh negative dielectric anisotropy and excellent mutual solubility, and the compound represented by the formula III is a bicyclic neutral monomer with very low rotary viscosity and excellent mutualsolubility, and can effectively reduce the rotary viscosity of the liquid crystal composition and improve the response time. The liquid crystal composition has low rotary viscosity, a high voltage retention rate, good low temperature mutual solubility, a fast response time and excellent application prospects.

The invention provides a liquid crystal composition which comprises the following components in percentage by weight: (1), 1%-60% of one or more compounds represented by a formula I; (2), 1%-30% of one or more compounds represented by a formula II; (3), 1%-80% of one or more compounds represented by a formula III; (4), 0%-30% of one or more compounds represented by a formula IV; (5), 0%-30% of one or more compounds represented by a formula V. In order to solve the problem that response speed of a liquid crystal display is low due to high viscosity of a liquid crystal material in the prior art, the liquid crystal composition provided by the invention has quicker response time and especially has better low-temperature response time due to low rotary viscosity and great elasticity constant. The liquid crystal composition provided by the invention can be used for quick-response liquid crystal display equipment with a plurality of display modes, and can obviously improve display effects of the liquid crystal display while being used in the display with a TN, IPS or FFS mode.

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 relates to a novel monomeric fluorinated terphenyl liquid crystal compound containing two 3-butenyls and a preparation method thereof. The monomeric fluorinated terphenyl liquid crystal compound containing two 3-butenyls and intermediates thereof are applicable to compound structural formulae (I) and (II). In the formulae (I) and (II), the number of fluorine atoms is two, and the two fluorine atoms can be in ortho-position, or meta-position or para-position; and X1 and X2 are iodine or bromine. The preparation method comprises the following steps: carrying out cross-coupling reaction on p-formylphenylboronic acid and the (II) under the catalytic action of a palladium catalyst in the alkaline environment to obtain a 4,4''-diformyl fluorinated terphenyl; and carrying out reduction, chlorination and coupling reaction to obtain the (I). The novel monomeric terphenyl liquid crystal compound provided by the invention has the advantages of moderate synthesis conditions, high conversion rate and low cost.

The invention discloses a liquid crystal composition containing bicycle-octane, belonging to the field of liquid crystal display materials. The liquid crystal composition is composed of 1-40% of a positive dielectric compound containing a component A shown in the general formula I, 2-40% of a positive dielectric compound containing a component B shown in the general formula II and/or general formula III and 10-80% of a neutral dielectric compound containing a component C shown in the general formula IV; in addition, optically active compound which is 0-0.5% of the sum of the mass of the liquid crystal composition is added. The liquid crystal composition is low in viscosity, short in response time, proper in photology, good in anisotropy, proper in dielectric anisotropy and particularly suitable for manufacturing quick-response active matrix TN-TFTs (Twisted Nematic Thin Film Transistors), IPS-TFTs (In-Plane Switching Thin Film Transistors) or FFS (Fringe Field Switching) liquid crystal display elements and liquid crystal displays.