CN107760317B - A liquid crystal composition containing a cyclohexene-based liquid crystal compound and its application - Google Patents

Abstract

The present invention relates to the technical field of liquid crystals, and in particular to a liquid crystal composition containing a cyclohexene-based liquid crystal compound, which comprises one or more of the compounds represented by the general formula I and one of the compounds represented by the general formula II. one or more; wherein, the compound of the general formula I is a compound with a cyclohexene structure, and this type of compound has a large negative dielectric anisotropy; the compound of the general formula II is a two-ring structure compound, and this type of structure has a low The rotational viscosity can effectively reduce the rotational viscosity of the liquid crystal composition and improve the response time of the liquid crystal display. The liquid crystal composition of the present invention has low rotational viscosity and can be used for fast-response liquid crystal displays of various display modes, and its use in VA mode displays such as VA, MVA, PVA, PSVA, or IPS and FFS mode displays can significantly improve the liquid crystal display. display effect.

Description

A liquid crystal composition containing a cyclohexene-based liquid crystal compound and its application

technical field

The present invention relates to the technical field of liquid crystals, in particular to a liquid crystal composition containing a cyclohexene-based liquid crystal compound and its application. Specifically, the liquid crystal composition provided by the present invention has negative dielectric anisotropy.

Background technique

At present, liquid crystal has been widely used in the field of information display, and the application in optical communication has also made some progress (S.T.Wu, D.K.Yang.Reflective Liquid Crystal Display Y.Wiley, 2001). In recent years, the application fields of liquid crystal compounds have been significantly expanded to various display devices, electro-optic devices, electronic components, sensors, etc., and nematic liquid crystal compounds have been the most widely used in flat panel displays, especially for TFT active in the matrix system.

At present, negative liquid crystals are widely used in large-size TV liquid crystal displays, especially the emergence of PSVA technology, which makes negative liquid crystals more popular; It has high transmittance, which can greatly reduce the energy consumed by the backlight of the LCD, improve the display quality of the LCD, and prolong the battery life of the mobile device.

Negative liquid crystal was first proposed in the late 1980s. It is mainly used in VA mode. Its main advantage is high contrast ratio, and its main disadvantage is small viewing angle and slow response time. With the development of display technology, MVA, PVA, PSVA and other technologies have appeared one after another, solving the problems of response time and viewing angle. In recent years, as touch screens have become the mainstream of the mobile device market, IPS and FFS type hard-screen displays have inherent advantages. IPS and FFS type displays can use both positive liquid crystal and negative liquid crystal. When the electric field is bent, the positive liquid crystals are arranged along the direction of the electric field lines, which causes the molecules to bend, so that the transmittance decreases; the negative liquid crystals are arranged perpendicular to the direction of the electric field lines, so the transmittance will be greatly improved. The best way to reduce backlight power consumption. However, the problem of response time of negative liquid crystal is a major problem encountered at present. The response time of FFS display using negative liquid crystal is 50% or more slower than that of positive liquid crystal. Therefore, how to improve the response time of negative liquid crystals has become a core issue at present.

(d为液晶层厚度，γ1为液晶旋转粘度，Keff为有效弹性常数)，因此，降低旋转粘度、降低液晶层厚度和提升弹性常数均可以达到改善响应时间的目的，液晶层厚度取决于液晶显示器的设计；对于液晶组合物，降低旋转粘度和液晶厚度最有效。Specifically, the response time of an LCD depends on

(d is the thickness of the liquid crystal layer, γ1 is the rotational viscosity of the liquid crystal, and Keff is the effective elastic constant). Therefore, reducing the rotational viscosity, reducing the thickness of the liquid crystal layer and increasing the elastic constant can all achieve the purpose of improving the response time. The thickness of the liquid crystal layer depends on the liquid crystal display. design; for liquid crystal compositions, it is most effective to reduce rotational viscosity and liquid crystal thickness.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a liquid crystal composition containing a cyclohexene-based liquid crystal compound, the liquid crystal composition has low rotational viscosity, and can effectively reduce the response time of a liquid crystal display.

In order to achieve the above object, the present invention adopts the following technical scheme, a liquid crystal composition containing a cyclohexene-based liquid crystal compound, comprising one or more of the compounds represented by the general formula I:

One or more of the compounds represented by the general formula II:

Wherein, R ₁ and R ₂ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group; A ₁ represents a trans-1,4-cyclohexyl group or 1,4-phenylene, n ₁ and n ₂ each independently represent 0 or 1;

R ₃ and R ₄ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group; A ₂ represents a trans-1,4-cyclohexyl group or 1 , 4-phenylene.

Wherein, the compound represented by the general formula I is a compound having a cyclohexene structure, and this type of compound has a large negative dielectric anisotropy.

Specifically, the compound represented by general formula I is selected from one or more of formulae IA to formula ID:

Wherein, R ₁ represents a straight-chain alkyl group or a straight-chain alkenyl group of C ₂ -C ₇ ; R ₂ represents a straight-chain alkyl group or a straight-chain alkoxy group of C ₁ -C ₇ .

Preferably, the compound represented by the general formula I is selected from one or more of the formulae IA1 to ID36:

Preferably, the compound of general formula I provided by the present invention is selected from the group consisting of formula IA20, IA22, IA32, IB13, IB14, IB19, IB20, IB21, IB22, IB26, IB32, IC13, IC14, IC19, IC20, IC21, IC26, One or more of IC32, ID13, ID14, ID19, ID20, ID26, ID32.

In the liquid crystal composition, the compound of general formula I is used in an amount of 1-85%, preferably 20-40%, or 50-80%, or 15-50%, or 10-20%.

The compound of the general formula II provided by the present invention is a two-ring structure compound, and this type of structure has low rotational viscosity, which can effectively reduce the rotational viscosity of the liquid crystal composition and improve the response time of the liquid crystal display.

Specifically, the compound of general formula II is selected from one or more of formula IIA to formula IIB:

Wherein, R ₃ represents a C ₁ -C ₇ straight-chain alkyl group or a C ₂ -C ₇ straight-chain alkenyl group; R ₄ represents a C ₁ -C ₇ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C 7 straight-chain alkyl group C ₇ straight chain alkenyl.

Preferably, the compound of general formula II provided by the present invention is selected from one or more of formula IIA1 to formula IIB16:

More preferably, the compound of general formula II provided by the present invention is selected from one or more of formulae IIA2, IIA6, IIA14, IIA18, IIA20, IIA22, IIA26, IIA27, IIA32, IIB10, and IIB14.

In the liquid crystal composition, the amount of the compound of general formula II is 1-75%, preferably 10-40%, or 20-70%, or 25-40%, or 10-55%, or 30-55%, 50- 70%.

Preferably, the liquid crystal composition provided by the present invention further comprises one or more compounds represented by the general formula III:

Wherein, R ₅ and R ₆ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group; n ₃ is 0 or 1.

The compound represented by the general formula III is a liquid crystal compound containing a methoxy bridge bond and a 2,3-difluoro-1,4-phenyl structure, and this type of compound has a large negative dielectric anisotropy.

Specifically, the compound of general formula III is selected from one or more of formulae IIIA to IIIB:

Wherein, R ₅ represents a straight-chain alkyl group or a straight-chain alkenyl group of C ₂ -C ₇ ; R ₆ represents a straight-chain alkyl group or a straight-chain alkoxy group of C ₁ -C ₇ .

More preferably, the compound of general formula III is selected from one or more of formula IIIA1 to formula IIIB36:

More preferably, the compound represented by general formula III is selected from IIIA14, IIIA17, IIIA19, IIIA20, IIIA21, IIIA22, IIIA23, IIIA26, IIIA32, IIIB13, IIIB14, IIIB15, IIIB16, IIIB17, IIIB18, IIIB19, IIIB20, IIIB21, IIIB22 , one or more of IIIB23, IIIB24, IIIB29, IIIB35.

In the liquid crystal composition, the compound of general formula III is used in an amount of 0-70%, preferably 0-40%, or 0-15%, 10-60%, or 15-40%, or 10-55%.

Preferably, the liquid crystal composition provided by the present invention further comprises one or more compounds represented by the general formula IV:

Wherein, R ₇ and R ₈ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group; A ₄ represents a trans-1,4-cyclohexyl group or 1,4-phenylene.

The compound of the general formula IV provided by the present invention is a neutral compound with a tricyclic structure, and this type of structure has a lower rotational viscosity and a higher clearing point.

Specifically, the compound represented by the general formula IV provided by the present invention is selected from one or more of the formula IVA～the formula IVB:

Wherein, R ₇ represents a straight-chain alkyl group or a straight-chain alkenyl group of C ₂ -C ₇ , and R ₈ represents a straight-chain alkyl group or a straight-chain alkenyl group of C ₁ -C ₇ .

Preferably, the compound of general formula IV is selected from one or more of IVA1～IVB20:

More preferably, the compound of general formula IV is selected from one or more of formulae IVA2, IVA6, IVA10, IVA13, IVA16, IVB2, IVB6, IVB8, IVB15, IVB17.

In the liquid crystal composition, the compound of general formula IV is used in an amount of 0-50%, preferably 0-40%, or 0-30%, or 0-15%, or 10-30%, or 15-60%, or 4 -25%, or 3-13%.

Preferably, the liquid crystal composition provided by the present invention further comprises one or more compounds represented by the general formula V:

Wherein, R ₉ and R ₁₀ each independently represent F, a straight-chain alkyl group of C ₁ -C ₁₂ , a straight-chain alkoxy group or a straight-chain alkenyl group of C ₂ -C ₁₂ ; L ₁ , L ₂ , and L ₃ each independently represent H or F, and L ₁ and L ₃ are not F at the same time.

The compound represented by general formula V is selected from one or more of formula VA～formula VB:

Wherein, R ₉ and R ₁₀ each independently represent a C ₁ -C ₇ straight-chain alkyl group or a C ₂ -C ₇ straight-chain alkenyl group.

Preferably, the compound represented by the general formula V is selected from one or more of the formulas VA1 to VB6:

Preferably, the compound represented by general formula V is selected from one or more of formulae VA2, VA3, VA4, VA6, VA8, VA17, VA18, VA19, VA22, VA23, VA24, VB2, VB4.

In the liquid crystal composition, the compound of general formula V is used in an amount of 0-40%, preferably 0-25%, or 0-20%, or 0-15%, or 4-15%, or 5-21%, or 4 -14%.

The liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 1-85% of the compound represented by the general formula I;

(2), 1-75% of the compound represented by the general formula II;

(3), 0～70% of the compound represented by general formula III;

(4), 0～50% of the compound represented by the general formula IV;

(5), 0 to 40% of the compound represented by the general formula V.

Specifically, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 10-85% of the compound represented by the general formula I;

(2), 5-55% of the compound represented by the general formula II;

(3), 0～40% of the compound represented by general formula IV;

(4), 0 to 25% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 15-85% of the compound represented by the general formula I;

(2), 10-55% of the compound represented by the general formula II;

(3), 0～35% of the compound represented by general formula IV;

(4), 0-20% of the compound represented by the general formula V.

More preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 20-81% of the compound represented by the general formula I;

(2), 13-50% of the compound represented by the general formula II;

(3), 0～30% of the compound represented by general formula IV;

(4), 0-15% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 53-85% of the compound represented by the general formula I;

(2), 10-40% of the compound represented by the general formula II;

(3), 0～15% of the compound represented by general formula IV;

(4), 0-20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 53-81% of the compound represented by the general formula I;

(2), 13-36% of the compound represented by the general formula II;

(3), 0～5% of the compound represented by general formula IV;

(4), 0-15% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 15-65% of the compound represented by the general formula I;

(2), 20-55% of the compound represented by the general formula II;

(3), 0～35% of the compound represented by general formula IV;

(4), 0-20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 20-65% of the compound represented by the general formula I;

(2), 25-50% of the compound represented by the general formula II;

(3), 0～30% of the compound represented by general formula IV;

(4), 0-15% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 15-75% of the compound represented by the general formula I;

(2), 30-55% of the compound represented by the general formula II;

(3), 0～35% of the compound represented by general formula IV;

(4), 0-20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 20-70% of the compound represented by the general formula I;

(2), 30-50% of the compound represented by the general formula II;

(3), 0～30% of the compound represented by general formula IV;

(4), 0-15% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 45-85% of the compound represented by the general formula I;

(2), 10-35% of the compound represented by the general formula II;

(3), 0～10% of the compound represented by the general formula IV;

(4), 0-20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 53-81% of the compound represented by the general formula I;

(2), 13-35% of the compound represented by the general formula II;

(3), 0～5% of the compound represented by general formula IV;

(4), 0-15% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 45-85% of the compound represented by the general formula I;

(2), 10-40% of the compound represented by the general formula II;

(3), 0 to 20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 53-81% of the compound represented by the general formula I;

(2), 13-36% of the compound represented by the general formula II;

(3), 0 to 15% of the compound represented by the general formula V.

Further preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 53-81% of the compound represented by the general formula I;

(2), 13-32% of the compound represented by the general formula II;

(3), 4 to 15% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 64-81% of the compound represented by the general formula I;

(2), 19-36% of the compound represented by the general formula II;

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 15-65% of the compound represented by the general formula I;

(2), 20-55% of the compound represented by the general formula II;

(3), 1-35% of the compound represented by the general formula IV;

(4), 0-15% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 20-62% of the compound represented by the general formula I;

(2), 25-50% of the compound represented by the general formula II;

(3), 5～30% of the compound represented by general formula IV;

(4), 0 to 8% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 50-85% of the compound represented by the general formula I;

(2), 10-35% of the compound represented by the general formula II;

(3), 0～10% of the compound represented by the general formula IV;

(4), 1 to 20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 53-81% of the compound represented by the general formula I;

(2), 13-32% of the compound represented by the general formula II;

(3), 0～5% of the compound represented by general formula IV;

(4), 4-15% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 15-85% of the compound represented by the general formula I;

(2), 15-55% of the compound represented by the general formula II;

(3), 0-35% of the compound represented by the general formula IV.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 20-81% of the compound represented by the general formula I;

(2), 19-50% of the compound represented by the general formula II;

(3), 0-30% of the compound represented by the general formula IV.

Further preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 20-40% of the compound represented by the general formula I;

(2), 45-55% of the compound represented by general formula II;

(3), 10-30% of the compound represented by the general formula IV.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 1-55% of the compound represented by the general formula I;

(2), 10-70% of the compound represented by the general formula II;

(3), 1-65% of the compound represented by the general formula III;

(4), 0～35% of the compound represented by general formula IV;

(5), 0-30% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 3-50% of the compound represented by the general formula I;

(2), 15-70% of the compound represented by the general formula II;

(3), 1-60% of the compound represented by the general formula III;

(4), 0～30% of the compound represented by general formula IV;

(5), 0 to 25% of the compound represented by the general formula V.

More preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-47% of the compound represented by the general formula I;

(2), 19-66% of the compound represented by the general formula II;

(3), 3-57% of the compound represented by the general formula III;

(4), 0～27% of the compound represented by general formula IV;

(5), 0-21% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 3-20% of the compound represented by the general formula I;

(2), 20-70% of the compound represented by the general formula II;

(3), 3-60% of the compound represented by the general formula III;

(4), 0～35% of the compound represented by general formula IV;

(5), 0 to 27% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-20% of the compound represented by the general formula I;

(2), 24-66% of the compound represented by the general formula II;

(3), 5-56% of the compound represented by the general formula III;

(4), 0～27% of the compound represented by general formula IV;

(5), 0-21% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 15-26% of the compound represented by the general formula I;

(2), 15-70% of the compound represented by the general formula II;

(3), 2-60% of the compound represented by the general formula III;

(4), 0～15% of the compound represented by the general formula IV;

(5), 0 to 25% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 15-26% of the compound represented by the general formula I;

(2), 19-66% of the compound represented by the general formula II;

(3), 3-57% of the compound represented by the general formula III;

(4), 0～13% of the compound represented by the general formula IV;

(5), 0-21% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 21-50% of the compound represented by the general formula I;

(2), 15-70% of the compound represented by the general formula II;

(3), 2-60% of the compound represented by the general formula III;

(4), 0～15% of the compound represented by the general formula IV;

(5), 0-15% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 21-47% of the compound represented by the general formula I;

(2), 19-66% of the compound represented by the general formula II;

(3), 3-57% of the compound represented by the general formula III;

(4), 0～13% of the compound represented by the general formula IV;

(5), 0-13% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-50% of the compound represented by the general formula I;

(2), 15-36% of the compound represented by the general formula II;

(3), 13-60% of the compound represented by the general formula III;

(4), 0～15% of the compound represented by the general formula IV;

(5), 0-20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 10-47% of the compound represented by the general formula I;

(2), 19-36% of the compound represented by the general formula II;

(3), 17-57% of the compound represented by the general formula III;

(4), 0～13% of the compound represented by the general formula IV;

(5), 0-14% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 3-50% of the compound represented by the general formula I;

(2), 30-45% of the compound represented by the general formula II;

(3), 10-55% of the compound represented by the general formula III;

(4), 0～25% of the compound represented by the general formula IV;

(5), 0 to 25% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-47% of the compound represented by the general formula I;

(2), 30-45% of the compound represented by the general formula II;

(3), 11-53% of the compound represented by the general formula III;

(4), 0～23% of the compound represented by general formula IV;

(5), 0-21% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 3-45% of the compound represented by the general formula I;

(2), 36-70% of the compound represented by the general formula II;

(3), 2-50% of the compound represented by the general formula III;

(4), 0～30% of the compound represented by general formula IV;

(5), 0 to 25% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-47% of the compound represented by the general formula I;

(2), 36-66% of the compound represented by the general formula II;

(3), 3-48% of the compound represented by the general formula III;

(4), 0～27% of the compound represented by general formula IV;

(5), 0-21% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-47% of the compound represented by the general formula I;

(2), 36-66% of the compound represented by the general formula II;

(3), 3-48% of the compound represented by the general formula III;

(4), 0～27% of the compound represented by general formula IV;

(5), 0-21% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 3-50% of the compound represented by the general formula I;

(2), 20-70% of the compound represented by the general formula II;

(3), 5-55% of the compound represented by the general formula III;

(4), 1-30% of the compound represented by the general formula IV;

(5), 0-20% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-46% of the compound represented by the general formula I;

(2), 27-66% of the compound represented by the general formula II;

(3), 10-52% of the compound represented by the general formula III;

(4), 3-27% of the compound represented by the general formula IV;

(5), 0-14% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-50% of the compound represented by the general formula I;

(2), 15-70% of the compound represented by the general formula II;

(3), 2-60% of the compound represented by the general formula III;

(4), 0 to 25% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 10-47% of the compound represented by the general formula I;

(2), 19-66% of the compound represented by the general formula II;

(3), 3-57% of the compound represented by the general formula III;

(4), 0-21% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 10-22% of the compound represented by the general formula I;

(2), 27-57% of the compound represented by the general formula II;

(3), 3-52% of the compound represented by the general formula III;

(4), 5-21% of the compound represented by the general formula V.

Most preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 16-34% of the compound represented by the general formula I;

(2), 19-66% of the compound represented by the general formula II;

(3), 14-57% of the compound represented by the general formula III.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 3-50% of the compound represented by the general formula I;

(2), 20-70% of the compound represented by the general formula II;

(3), 2-55% of the compound represented by the general formula III;

(4), 0～15% of the compound represented by the general formula IV;

(5), 1 to 25% of the compound represented by the general formula V.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-43% of the compound represented by the general formula I;

(2), 27-66% of the compound represented by the general formula II;

(3), 3-52% of the compound represented by the general formula III;

(4), 0～13% of the compound represented by the general formula IV;

(5), 4-21% of the compound represented by the general formula V.

Further preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-21% of the compound represented by the general formula I;

(2), 27-39% of the compound represented by the general formula II;

(3), 17-37% of the compound represented by the general formula III;

(4), 3-13% of the compound represented by the general formula IV;

(5), 4 to 14% of the compound represented by the general formula V.

Alternatively, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 5-50% of the compound represented by the general formula I;

(2), 15-70% of the compound represented by the general formula II;

(3), 5-60% of the compound represented by the general formula III;

(4), 0-30% of the compound represented by the general formula IV.

Preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 10-47% of the compound represented by the general formula I;

(2), 19-66% of the compound represented by the general formula II;

(3), 10-57% of the compound represented by the general formula III;

(4), 0-27% of the compound represented by the general formula IV.

Further preferably, the liquid crystal composition provided by the present invention comprises the following compounds in weight percentage:

(1), 10-46% of the compound represented by the general formula I;

(2), 29-66% of the compound represented by the general formula II;

(3), 10-57% of the compound represented by the general formula III;

(4), 4-23% of the compound represented by the general formula IV.

The preparation method of the liquid crystal composition of the present invention is not particularly limited, and can be produced by mixing two or more compounds by conventional methods, such as by mixing different components at high temperature and dissolving each other. The compound is dissolved in the solvent used for the compound and mixed, and then the solvent is distilled off under reduced pressure; or the liquid crystal composition of the present invention can be prepared according to a conventional method, such as placing the component with a smaller content in a higher It is obtained by dissolving in the main components with a large content at a high temperature, or dissolving each component in an organic solvent, such as acetone, chloroform or methanol, etc., and then mixing the solutions to remove the solvent.

The liquid crystal composition of the present invention has low rotational viscosity and can be used for fast-response liquid crystal displays of various display modes, and its use in VA mode displays such as VA, MVA, PVA, PSVA, or IPS and FFS mode displays can significantly improve the liquid crystal display. The display shows the effect.

Preferably, the liquid crystal composition provided by the present invention further comprises one or more polymerizable compounds represented by the general formula VI:

m represents 0 or 1; SP ₁ and SP ₂ each independently represent a polymerizable group, L ₄ represents H or F, and L ₅ represents H, F, straight-chain alkyl or straight-chain alkoxy of C ₁ to C ₅ ;

Preferably, the polymerizable compound represented by the general formula VI is selected from one or more of the formulae VIA to VIF:

Wherein, SP ₁ and SP ₂ each independently represent an acrylate group, a methacrylate group, a crotonate group or a C ₂ -C ₈ linear alkenyl group.

More preferably, the polymerizable compound represented by the general formula VI is selected from one or more of the formulas VIA1 to VIF3:

More preferably, the compound represented by general formula VI is selected from one or more of formulae VIA2, VIB2, VIC2, VID2, VIE2, and VIF2.

The amount of the polymerizable compound of the general formula VI provided by the present invention is 0.1-5% by weight of the liquid crystal composition; the preferred amount is 0.2-1.0% by weight of other liquid crystal compounds in the liquid crystal composition; more preferably, the amount is in the liquid crystal composition. 0.3-0.5% by weight of other liquid crystal compounds; the liquid crystal composition comprising the polymerizable compound provided by the present invention is used for PSVA liquid crystal displays.

The preparation method of the liquid crystal composition containing the polymerizable compound provided by the present invention is to pour the liquid crystal composition containing the polymerizable compound into a liquid crystal panel, and then polymerize by UV light irradiation, and continuously apply a voltage during the irradiation process. The polymerizable compound in the liquid crystal composition is polymerized under UV light irradiation, resulting in a network-like structure.

The liquid crystal compounds described in the present invention are all known products, which can be obtained commercially or provided by Bayi Shikong Liquid Crystal Technology Co., Ltd., or prepared according to the methods disclosed in the literature.

On the basis of common knowledge in the field, the above preferred conditions can be combined with each other to obtain preferred embodiments of the present invention.

Detailed ways

The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

Unless otherwise specified, the percentages in the present invention are percentages by weight; the temperature is in degrees Celsius; Δn represents optical anisotropy (25°C); _ε∥ and _ε⊥ represent parallel and perpendicular dielectric constants (25°C, 1000Hz), respectively; Δε represents the dielectric anisotropy (25°C, 1000Hz); γ1 represents the rotational viscosity (mPa.Y, 25°C); Cp represents the clearing point (°C) of the liquid crystal composition; K ₁₁ , K ₂₂ , and K ₃₃ represent the Splay, twist and bend elastic constants (pN, 25°C).

In the following examples, the group structure in the liquid crystal compound is represented by the codes shown in Table 1.

Table 1: Group Structure Codes of Liquid Crystal Compounds

Take the following compound structure as an example:

表示为：3YPWO4

Represented as: 3YPWO4

表示为：3CC1OWO2

Represented as: 3CC1OWO2

In the following examples, the preparation of the liquid crystal composition adopts the thermal dissolution method, which includes the following steps: weighing the liquid crystal compound by weight percentage with a balance, wherein there is no specific requirement for the order of weighing and adding, usually the melting point of the liquid crystal compound is from high to low. Weighing and mixing in sequence, heating and stirring at 60-100°C to make each component melt evenly, then filtering, rotary steaming, and finally encapsulating to obtain the target sample.

In the following examples, the weight percentage of each component in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following table.

Example 1

Table 2: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 2

Table 3: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 3

Table 4: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 4

Table 5: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 5

Table 6: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 6

Table 7: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 7

Table 8: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 8

Table 9: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 9

Table 10: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 10

Table 11: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 11

Table 12: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 12

Table 13: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 13

Table 14: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 14

Table 15: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 15

Table 16: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 16

Table 17: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 17

Table 18: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 18

Table 19: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 19

Table 20: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 20

Table 21: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 21

Table 22: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 22

Table 23: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 23

Table 24: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 24

Table 25: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 25

Table 26: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 26

Table 27: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 27

Table 28: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 28

Table 29: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 29

Table 30: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 30

Table 31: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 31

Table 32: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 32

Table 33: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 33

Table 34: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 34

Table 35: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 35

Table 36: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 36

Table 37: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 37

Table 38: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 38

Table 39: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 39

Table 40: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 40

Table 41: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 41

Table 42: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 42

Table 43: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 43

Table 44: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 44

Table 45: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 45

Table 46: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 46

Table 47: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 47

Table 48: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 48

Table 49: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 49

Table 50: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 50

Table 51: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 51

Table 52: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 52

Table 53: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 53

Table 54: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 54

Table 55: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 55

Table 56: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 56

Table 57: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 57

Table 58: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 58

Table 59: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 59

Table 60: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 60

Table 61: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 61

Table 62: The weight percentage and performance parameters of each component in the liquid crystal composition

Example 62

Table 63: Weight percentage and performance parameters of each component in the liquid crystal composition

Example 63

Table 64: Weight percentage and performance parameters of each component in the liquid crystal composition

Comparative Example 1

Table 65: Weight percentage and performance parameters of each component in the liquid crystal composition

The performance parameter values of the liquid crystal compositions obtained in Example 1, Example 21 and Comparative Example 1 are summarized and compared, as shown in Table 66.

Table 66: Comparison of performance parameters of liquid crystal compositions

Δn △ε Cp γ1 K₁₁ K₂₂ K₃₃ Example 1 0.108 -3.8 90 83 14.8 7.4 16.3 Example 21 0.110 -3.8 90 80 14.9 7.5 16.3 Comparative Example 1 0.108 -3.8 90 96 14.7 7.4 16.5

It can be known by comparison that, compared with Comparative Example 1, the liquid crystal composition provided in Example 1 has low rotational viscosity, that is, has a faster response time.

Example 64

By mass percentage, 99.7% of the nematic liquid crystal composition (N1) provided in Example 1 was mixed with 0.3% of the polymerizable compound VIA2 to prepare a liquid crystal mixture for PSVA (PA1), and the nematic liquid crystal was combined Substance N1 and PSVA mixture PA1 were charged into a standard VA test box and irradiated with UV (100mw/cm2) for two minutes under an applied voltage of 10V to test pretilt angle, threshold voltage and response time, respectively. The test results are shown in Table 67:

Table 67: Threshold Voltage and Response Time Test Results

Compared with the corresponding liquid crystal composition, the liquid crystal composition with the polymerizable compound has a lower threshold voltage and a faster response time after polymerization, which significantly improves the response time of the liquid crystal display.

Example 65

By mass percentage, 99.7% of the nematic liquid crystal composition (N24) provided in Example 24 and 0.3% of the polymerizable compound VIA2 were mixed to prepare a liquid crystal mixture for PSVA (PA24), and the nematic liquid crystal composition was mixed. The N24 and PSVA mixture PA24 were charged into a standard VA test cell and irradiated with UV (100mw/cm2) for two minutes at an applied voltage of 10V to test the pretilt angle, threshold voltage and response time, respectively. The test results are shown in Table 68:

Table 68: Threshold Voltage and Response Time Test Results

project titl(°) V₁₀(V) T(ms) N24 89.3 2.54 14.2 PA24 82.1 2.16 4.9

Compared with the corresponding liquid crystal composition, the liquid crystal composition with the polymerizable compound has a lower threshold voltage and a faster response time after polymerization, which significantly improves the response time of the liquid crystal display.

Example 66

By mass percentage, 99.6% of the nematic liquid crystal composition (N48) provided in Example 48 and 0.4% of the polymerizable compound VIB2 were mixed to prepare a liquid crystal mixture for PSVA (PB48), and the nematic liquid crystal composition was mixed. The N48 and PSVA mixture PB48 were charged into a standard VA test cell and irradiated with UV (100mw/cm2) for two minutes at an applied voltage of 10V, and the pretilt angle, threshold voltage and response time were tested, respectively. The test results are shown in Table 69:

Table 69: Threshold Voltage and Response Time Test Results

project titl(°) V₁₀(V) T(ms) N48 89.8 2.31 16.2 PB48 81.6 1.92 6.2

Example 67

By mass percentage, 99.5% of the nematic liquid crystal composition (N61) provided in Example 61 and 0.5% of the polymerizable compound VID2 were mixed to prepare a liquid crystal mixture for PSVA (PD61), and the nematic liquid crystal composition was The N61 and PSVA mixture PD61 were charged into a standard VA test cell and irradiated with UV (100mw/cm2) for two minutes at an applied voltage of 10V, and the pretilt angle, threshold voltage and response time were measured, respectively. The test results are shown in Table 70:

Table 70: Threshold Voltage and Response Time Test Results

project titl(°) V₁₀(V) T(ms) N61 89.7 2.39 15.6 PD61 81.1 2.03 5.8

Example 68

By mass percentage, 99.6% of the nematic liquid crystal composition (N62) provided in Example 62 and 0.4% of the polymerizable compound VIC2 were mixed to prepare a liquid crystal mixture for PSVA (PC62), and the nematic liquid crystal composition was mixed. The N62 and PSVA mixture PC62 were charged into a standard VA test cell and irradiated with UV (100mw/cm2) for two minutes at an applied voltage of 10V, and the pretilt angle, threshold voltage and response time were tested, respectively. The test results are shown in Table 71:

Table 71: Threshold Voltage and Response Time Test Results

project titl(°) V₁₀(V) T(ms) N62 89.4 2.38 15.4 PC62 81.0 2.03 5.7

Example 69

By mass percentage, 99.7% of the nematic liquid crystal composition (N63) provided in Example 63 and 0.3% of the polymerizable compound VIF2 were mixed to prepare a liquid crystal mixture for PSVA (PF63), and the nematic liquid crystal composition was mixed. The N63 and PSVA mixture PF63 were charged into a standard VA test cell and irradiated with UV (100mw/cm2) for two minutes at an applied voltage of 10V, and the pretilt angle, threshold voltage and response time were tested, respectively. The test results are shown in Table 72:

Table 72: Threshold Voltage and Response Time Test Results

project titl(°) V₁₀(V) T(ms) N63 89.4 2.46 15.0 PF63 81.4 2.15 5.2

It can be seen from Tables 67-72 that, compared with the corresponding liquid crystal compositions, the liquid crystal compositions with polymerizable compounds have lower threshold voltages and faster response times after polymerization, significantly improving the response time of liquid crystal displays.

After the liquid crystal composition provided by the invention is mixed with the polymerizable compound and used in a PSVA liquid crystal display, the response time of the liquid crystal display can be effectively improved, and the display effect of the liquid crystal display can be obviously improved.

The negative dielectric anisotropic liquid crystal composition provided by the present invention has low rotational viscosity, high resistivity and excellent light stability and thermal stability, and is suitable for VA, MVA, PVA, PSVA and other VA type liquid crystal displays or IPS and FFS type liquid crystal displays can effectively improve the response time of liquid crystal displays.

Although the present invention has been described in detail above with general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (15)

1. A liquid crystal composition comprising a cyclohexenyl liquid crystal compound, characterized in that: the liquid crystal composition is composed of the following compounds in percentage by weight:

(1) 60-68% of a compound represented by the general formula I;

(2) 28-32% of a compound represented by the general formula II;

(3) 4-9% of a compound represented by the general formula V;

wherein R is₁、R₂Each independently represents C₁～C₁₂Linear alkyl, linear alkoxy or C₂～C₁₂A linear alkenyl group of (a); a. the₁Represents trans-1, 4-cyclohexyl or 1, 4-phenylene, n₁、n₂Each independently represents 0 or 1;

R₃、R₄each independently represents C₁～C₁₂Linear alkyl, linear alkoxy or C₂～C₁₂A linear alkenyl group of (a); a. the₂Represents trans-1, 4-cyclohexyl or 1, 4-phenylene;

R₉、R₁₀each independently represent F, C₁～C₁₂Linear alkyl, linear alkoxy or C₂～C₁₂A linear alkenyl group of (a); l is₁、L₂、L₃Each independently represents H or F, L₁And L₃Not simultaneously F.

2. The liquid crystal composition according to claim 1, wherein: the compound represented by the general formula I is selected from one or more of formula IA to formula ID:

wherein R is₁Represents C₂～C₇A linear alkyl or linear alkenyl group of (a); r₂Represents C₁～C₇Linear alkyl or linear alkoxy groups of (1).

3. The liquid crystal composition according to claim 2, characterized in that: the compound represented by the general formula I is selected from one or more of formulas IA 1-ID 36:

4. the liquid crystal composition according to any one of claims 1 to 3, wherein: the compound represented by the general formula II is selected from one or more of the following formulas IIA to IIB:

wherein R is₃Represents C₁～C₇Straight chain alkyl or C₂～C₇A linear alkenyl group of (a); r₄Represents C₁～C₇Linear alkyl, linear alkoxy or C₂～C₇Linear alkenyl groups of (a).

5. The liquid crystal composition according to claim 4, wherein: the compound of the general formula II is selected from one or more of the following formulas IIA 1-IIB 16:

6. the liquid crystal composition according to claim 1, wherein: the compound represented by the general formula V is selected from one or more of the formulas VA to VB:

wherein R is₉、R₁₀Each independently represents C₁～C₇Straight chain alkyl or C₂～C₇Linear alkenyl groups of (a).

7. The liquid crystal composition according to claim 6, wherein: the compound represented by the general formula V is selected from one or more of formulas VA 1-VB 6:

8. the liquid crystal composition according to claim 1, wherein: further comprising one or more polymerizable compounds represented by the general formula VI:

wherein m represents 0 or 1; SP₁、SP₂Each independently represents a polymerizable group, L₄Represents H or F, L₅Representative H, F, C₁～C₅Linear alkyl or linear alkoxy groups of (1).

9. The liquid crystal composition according to claim 8, wherein: the polymerizable compound represented by formula VI is selected from one or more of formulae VIA to VIF:

wherein, SP₁、SP₂Each independently represents an acrylate group, a methacrylate group, a butenoate group or C₂～C₈Linear alkenyl groups of (a).

10. The liquid crystal composition according to claim 9, characterized in that: the polymerizable compound represented by the general formula VI is selected from one or more of the formulas VIA 1-VIF 3:

11. the liquid crystal composition according to any one of claims 8 to 10, wherein: the amount of the polymerizable compound in the general formula VI is 0.1-5% of the weight of the liquid crystal composition.

12. The liquid crystal composition according to claim 11, characterized in that: the amount of the polymerizable compound in the general formula VI is 0.2-1.0% of the weight of the liquid crystal composition.

13. The liquid crystal composition according to claim 12, wherein: the amount of the polymerizable compound in the general formula VI is 0.3-0.5% of the weight of the liquid crystal composition.

14. Use of a liquid crystal composition according to any of claims 1 to 7 in a VA, IPS or FFS mode display or of a liquid crystal composition according to any of claims 8 to 13 in a PSVA display.

15. The use according to claim 14, wherein said VA mode display is selected from one of VA, MVA, PVA, PSVA.