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

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.

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 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 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 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 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 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.