191results about How to "Appropriate optical anisotropy" patented technology

The invention relates to the liquid crystal field, and especially relates to a liquid crystal composition and applications thereof in the liquid crystal display field. The liquid crystal composition is composed of the following compounds in parts by weight: 5 to 40 parts of one or more compounds represented by the formula I, 2 to 30 parts of one or more compounds represented by the formula II, and 20 to 70 parts of one or more compounds represented by the formula III, and may also comprises 4 to 30 parts of one or more compounds represented by the formula IV, or / and 5 to 25 parts of one or more compounds represented by the formula V to IX. By the cooperation among the compounds, the rotation viscosity of the liquid crystal composition can be effectively reduced, the related performances of mixed liquid crystal are improved, and thus the responding time is reduced. The provided liquid crystal composition can be used to produce quick response liquid crystal display with a plurality of display modes.

The purpose of the present invention is to provide a liquid crystalline compound; a liquid crystal composition containing the compound; and a liquid crystal display element including the composition,the liquid crystalline compound satisfying at least one physical property among high stability against heat and light, high transparency, low minimum temperature of the liquid crystal phase, low viscosity, proper optical anisotropy, negatively large dielectric anisotropy, proper elastic constant, good compatibility with other liquid crystalline compounds at room temperature and low temperature, and the like. Provided is a compound represented by formula (1), or the like. In the formula, R1 and R2 are hydrogen, C1-10 alkyl, C2-9 alkoxyl, or the like; ring A1 is 1,3-cyclopentylene or the like; Y1 and Y2 are hydrogen, fluorine, or the like; Z1 and Z2 are a single bond, C1-6 alkylene, or the like; ring N1 is 1,4-cyclohexylene, 1,4-penylene, or the like; and n is 0, 1, or 2.

The invention discloses a positive dielectric anisotropic liquid crystal composition. The positive dielectric anisotropic liquid crystal composition comprises 1%-40% by weight of compound with a structural formula I, 1%-50% by weight of compound with a structural formula II, 1%-60% by weight of compound with a structural formula III and 1%-80% by weight of compound with a structural formula IV, and an optically active compound accounting for 0-0.5% of the total weight of the liquid crystal composition can be additionally added. The liquid crystal composition has the advantages of suitable positive dielectric anisotropy, lower rotary viscosity, very low total response time, lower voltage and higher resistivity and voltage holding ratio, and further has broad application prospects and application values in liquid crystal display.

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.

Provided is a polar compound which has high chemical stability and high ability of aligning liquid crystal molecules, and which enables the achievement of high voltage holding ratio if used for a liquid crystal display element. A compound represented by formula (1). (In the formula, R1 represents, for example, an alkyl group having 1-15 carbon atoms; each of rings A1-A5 represents 1,4-cyclohexylene or 1,4-phenylene; each of Z1 and Z5 represents a single bond or an alkylene group having 1-10 carbon atoms; each of a and b represents a number of 0-4, and the sum of a and b is 4 or less; d represents a number of 1-4; each of c and e represents a number of 0-4; each of P1-P3 represents a polymerizable group represented by one of formulae (P-1)-(P-5), wherein each of M1-M3 represents a hydrogen atom or an alkyl group having 1-5 carbon atoms; and R2 represents a group represented by one of formulae (1a)-(1c), wherein each of Sp1-Sp5 represents a single bond or an alkylene group having 1-10 carbon atoms, S1 represents >CH-, S2 represents >C<, and X1 represents -OH.)

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 provides a liquid crystal composition with suitable negative dielectric anisotropy, suitable optical anisotropy, lower viscosity and wider nematic range. The liquid crystal composition comprises the following compounds in percentage by weight: 5%-30% of compound of general formula (I), 5%-50% of compound of general formula (II), 5%-30% of compound of general formula (III), 5%-50% of compound of general formula (IV) and 1%-15% of compound of general formula (V), wherein R1, R3, R5, R7, R9 and R10 are mutually and independently a linear alkyl with 1-10 carbon atoms, R2, R4 and R6 are respectively a linear alkyl or alkoxy with 1-10 carbon atoms, and R8 is a linear alkyl or alkoxy with 1-10 carbon atoms or an alkenyl with 2-10 carbon atoms. The liquid crystal composition is applicable to VA (Vertical Alignment) or IPS (In-Plane Switching) type active matrix addressing LCDs. The invention further provides an LCD (liquid crystal display) containing the liquid crystal composition.

Provided is a liquid crystal compound satisfying at least one physical property from among having excellent stability with respect to heat, light, or the like, a high clearing point, a low liquid-crystal-phase lower limit temperature, a low viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy, a suitable elastic constant, and excellent compatibility with other liquid crystal compounds. The compound is represented by formula (1). In formula (1): R1 and R2 represent C1-15 alkyl groups; ring A1 and ring A2 represent 1, 4-cyclohexylene or 1, 4-phenylene; Z1 and Z2 represent single bonds, -(CH2)2-, -CH=CH-, -C≡C-, -COO-, -OCO-, -CH2O-, -OCH2-, -CF2O-, -OCF2-, or -CF=CF-; a and b represent 0, 1, or 2; and the sum of a and b is 1 or 2.

The invention relates to a liquid crystal medium containing a terphenyl compound and application thereof, and discloses a liquid crystal medium and application of the liquid crystal medium in liquid crystal display. The liquid crystal medium has positive dielectric anisotropy, and is characterized by containing one or more compounds represented by a structural formula (I) which is shown in the description. The liquid crystal medium provided by the invention is excellent in performance, has wide nematic phase temperature range, high reflective index anisotropy, extremely high electric charge retention rate and low rotary viscosity, can maintain high electric charge retention rate, low power consumption and the like, and has extremely high response speed. The composition disclosed by the invention has wide application prospect and application value in liquid crystal display, and is particularly suitable for manufacturing quick-response active matrix TN-TFT, IPS-TFT, FFS-TFT displays with great refractive index anisotropy.

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.

Provided is a liquid crystal compound, which has large dielectric anisotropy, a high voltage retention rate and good stability in the presence of light and heat, becomes a nematic phase within a broad temperature range, has the appropriate optical anisotropy, and has excellent compatibility with other liquid crystal compounds, particularly a liquid crystal compound having large dielectric anisotropy. The compound is represented by formula (1) (1) where, for instance, R1 is a C1-20 alkyl, rings A1, A2, A3, A4, A5 and A6 are, independently, 1,4-cyclohexylene or 1,4-phenylene; Z1, Z2, Z3, Z4, Z5, Z6 and Z7 are, independently, single bonds, -(CH2)2-, -COO-, -OCO-, -CF2O-, -OCF2-, or -CH=CH-; X1 is a fluorine, -CF3, or -OCF3; and Y1 and Y2 are, independently, hydrogen or fluorine.

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 positive dielectric liquid crystal composition. The positive dielectric liquid crystal composition comprises a component A which consists of one or more liquid crystal compounds shown in a general formula I, and an additive component D which consists of one or more compounds shown in a general formula S-1, a structural formula S-2, a structural formula S-3 and a general formula S-4. The positive dielectric liquid crystal composition does not change under the conditions of high temperature and ultraviolet radiation, so that the liquid crystal quality is improved; the positive dielectric liquid crystal composition is applicable to an active matrix electric optical element and a liquid crystal display, and can be applied to civil use and practical TFT-LCDs (Thin-Film Transistor Liquid Crystal Displays) under special severe conditions.

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 discloses a liquid crystal composition and application thereof. The liquid crystal composition comprises: at least one compound of general formula I and at least one compound of generalformula I'. The liquid crystal composition provided by the invention has suitable optical anisotropy, has relatively high bright spot, and has relatively large elastic constants K11 and K33 while maintaining relatively high clearing point and relatively low dielectric anisotropy and good low-temperature clearing point. When applied to liquid crystal displays, the liquid crystal composition can show the advantages of fast response, high contrast, wide temperature range, etc.