TW201800561A - Liquid crystal composition and liquid crystal display member having moderate dielectric anisotropy and moderate optical anisotropy and stability to heat and light - Google Patents

Abstract

The present invention provides a liquid crystal composition, comprising one or more compounds represented by formula I, and one or more compounds represented by formula II, and further the liquid crystal composition comprises a compound represented by formula II-A, wherein each of these substituents gives its definition. The composition provided by this invention has low viscosity [gamma]1, moderate dielectric anisotropy [Delta] [epsilon] and moderate optical anisotropy [Delta]n, so as to realize the quick response to the liquid crystal display.

Description

Liquid crystal composition and liquid crystal display element

The present invention relates to the field of liquid crystal displays, and in particular to a liquid crystal composition and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition.

At present, the application range of liquid crystal compounds is expanding, and they can be applied to various types of displays, electro-optical elements, sensors, and the like. There are many types of liquid crystal compounds used in the above display field, among which nematic liquid crystal is most widely used. Nematic liquid crystals have been used in passive TN, STN matrix displays and systems with TFT active matrix.

For the application field of thin film transistor technology (TFT-LCD), although the market has been huge in recent years and the technology has gradually matured, the requirements for display technology are also constantly increasing, especially in achieving fast response and reducing the driving voltage to Reduce power consumption and other aspects. Liquid crystal materials, as one of the important optoelectronic materials for liquid crystal displays, play an important role in improving the performance of liquid crystal displays.

As a liquid crystal material, it is necessary to have good chemical and thermal stability and stability to electric fields and electromagnetic radiation. As a liquid crystal material for thin-film transistor technology (TFT-LCD), in addition to the above stability, it should also have a wide nematic temperature range, suitable birefringence anisotropy, very high resistivity, Good UV resistance, high charge retention and low vapor pressure.

For dynamic picture display applications, eliminating the ghosting and smearing of the display screen requires the liquid crystal to have a fast response speed, and therefore requires the liquid crystal to have a low rotational viscosity γ ₁ ; In addition, for portable devices, in order to reduce the energy consumption of the device, It is desirable that the driving voltage of the liquid crystal is as low as possible; and for a display such as a television, the driving voltage requirement for the liquid crystal is not so low.

The viscosity of the liquid crystal compound, especially the rotational viscosity γ ₁ directly affects the response time of the liquid crystal after power-on. Whether it is the rise time (t _on ) or the fall time (t _off ), it is directly proportional to the liquid crystal's rotational viscosity γ ₁ and rises. The time (t _on ) is related to the liquid crystal cell and the driving voltage, which can be adjusted by increasing the driving voltage and reducing the thickness of the liquid crystal cell; the falling time (t _off ) has nothing to do with the driving voltage, and is mainly related to the elastic constant of the liquid crystal. It is related to the thickness of the liquid crystal cell. The decrease of the thickness will decrease the fall time (t _off ). In different display modes, the liquid crystal molecules move differently. The three modes of TN, IPS, and VA are respectively related to the average elastic constant K, the torsional elastic constant, The bending elastic constant is inversely related.

According to the theory of liquid crystal continuum, after different kinds of liquid crystals are deformed under the action of external force (electric field, magnetic field), they will “rebound” to their original shape through the interaction between the molecules. Similarly, liquid crystal is also caused by intermolecular The interaction forces form "viscosity". Small changes in the liquid crystal molecules will cause obvious changes in the general parameters of the liquid crystal. Some of these changes have a certain regularity, and some seem to be difficult to find. They also have a significant impact on the interaction between the liquid crystal molecules. These effects are very Subtle, so far there is no perfect theoretical explanation.

The viscosity of liquid crystal is related to the structure of the liquid crystal molecules. Studying the relationship between the viscosity of liquid crystal systems formed by different liquid crystal molecules and the structure of the liquid crystal molecules is one of the important tasks of liquid crystal formulation engineers.

An object of the present invention is to provide a liquid crystal composition and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition. The liquid crystal composition has a low viscosity, can achieve a fast response, and has a moderate dielectric anisotropy Δε, Moderate optical anisotropy Δn, high stability to heat and light. The liquid crystal display element or liquid crystal display containing the liquid crystal composition has a wide nematic temperature range, suitable birefringence anisotropy, very high resistivity, good ultraviolet resistance, high charge retention, and low steam. Pressure and other properties.

Ⅰ

Ⅱ

Ⅱ-AIn order to achieve the above-mentioned beneficial technical effects, the present invention provides a liquid crystal composition, the liquid crystal composition includes one or more compounds represented by Formula I and one or more compounds represented by Formula II, and the liquid crystal composition includes compounds represented by Formula II-A :

I

Ⅱ

Ⅱ-A

among them,

R ₁ , R ₂ , and R ₃ each independently represent an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and fluorine Substituted alkoxy groups having 1-9 carbon atoms, alkenyl groups having 2-9 carbon atoms, alkenyl groups having 2-9 carbon atoms substituted by fluorine, and chains having 3-8 carbon atoms Alkenyloxy or fluorine-substituted alkenyloxy having 3 to 8 carbon atoms;

X represents H or F.

表示1,4-亞苯基、1,4-亞環己基或1,4-亞環己烯基。

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexylene.

The liquid crystal composition provided by the present invention must contain at least one compound represented by Formula I, and must include a compound represented by Formula II-A among the compounds represented by Formula II, and may further include one or more compounds represented by Formula II except for Formula II- Compounds other than A.

The liquid crystal composition provided by the present invention has a large refractive index (suitable for low cell thickness) and a large elastic constant. Since the response speed of the liquid crystal is inversely proportional to the elastic constant, it is proportional to the cell thickness (the thinner the thickness , The faster the response), so it is very helpful to achieve a fast response.

As a preferred solution, the liquid crystal composition provided by the present invention does not include a liquid crystal compound containing -CN, and does not include a liquid crystal compound containing a pyridine or pyrimidine ring.

The present invention is more preferably a liquid crystal compound that does not contain a fused ring structure.

The liquid crystal composition Δn [589nm, 25 ° C] provided by the present invention is ＞ 0.08, Δε [1KHz, 25 ° C] ＞ 2, the clear point Cp is> 70.0 ° C, and the rotational viscosity γ ₁ [25 ° C] is between 40 and 110 mPa · s between.

In the liquid crystal composition provided by the present invention, the preferred mass content of the compound represented by Formula I is 1-20%; the preferred content of the compound represented by Formula II-A is 20-40%, and the preferred content of the compound represented by Formula II is 25-55%;

The liquid crystal composition of the present invention does not contain a liquid crystal component containing a -CN structure and a pyridine or pyrimidine ring compound. -CN has a large permanent dipole moment, the electron cloud is rich, and it is easy to adsorb cations, which leads to the degradation of the liquid crystal electrical properties, such as charge retention VHR, resistivity ρ, power consumption, etc .; pyridine and pyrimidine ring compounds due to UV Electrons are susceptible to excitation and cause quality degradation.

Condensed-loop liquid crystal molecules often do not have good linearity and high viscosity. The inclusion of these components is not conducive to improving the response speed of liquid crystals.

Ⅰ1

Ⅰ2

Ⅰ3

Ⅰ4

Ⅰ5

Ⅰ6

Ⅰ7

Ⅰ8The compound represented by the formula I is preferably a compound represented by the formulae I1-I8:

I1

I2

I3

I4

I5

I6

I7

I8

Ⅱ1

Ⅱ2

Ⅱ3

Ⅱ4

Ⅱ5

Ⅱ6

Ⅱ7

Ⅱ8

Ⅱ9

Ⅱ10。The one or more compounds represented by formula II include compounds represented by formula II-A, and preferably one or more compounds among compounds represented by II1-II10,

II1

Ⅱ2

Ⅱ3

Ⅱ4

II5

II6

II7

Ⅱ8

II9

Ⅱ10.

The compound shown by formula I generally has good miscibility with other liquid crystals, and has a high clearing point CP, generally above 200 ° C, but changes with the length of the R ₁ alkyl chain. When the alkyl chain is longer, the clear The point CP will be higher.

The dielectric anisotropy Δε of the compound represented by the formula I is large, about 20 or more. Due to the large electronegativity of the substituent CF ₃ and the cumulative effect with the fluorine atom, the compounds represented by the formula I1-I8 The compound has a larger permanent dipole moment, especially the compounds shown in I1-I8 have a larger permanent dipole moment, so the dielectric anisotropy Δε is relatively large, which is a strongly polar monomer, which is beneficial to improve the Dielectric anisotropy. It has a terphenyl conjugate system and has a large optical anisotropy Δn. It is beneficial to increase the Δn of the liquid crystal mixture, increase the dielectric anisotropy of the liquid crystal mixture, and increase the clear point of the liquid crystal mixture.

The compound represented by Formula II has a very low rotational viscosity γ ₁ , a near-neutral dielectric anisotropy Δε, and a small optical anisotropy Δn, and has advantages in improving the viscosity and low-temperature properties of liquid crystals. Different alkyl substituents have an influence on the rotational viscosity of the liquid crystal γ ₁ and the clear point CP. Generally, a longer alkyl chain or alkenyl chain will increase the rotational viscosity of the liquid crystal γ ₁ and increase the clear point CP, but the formula The compound γ ₁ shown by II-A is the lowest.

The liquid crystal composition provided by the present invention has a large refractive index, and is very suitable for low-cell-thickness liquid crystals. The low-cell-thickness display is advantageous for achieving fast response. The composition of the present invention also has a large elastic constant. The elastic constant is inversely proportional, which is very beneficial to achieve a fast response; therefore, the liquid crystal composition of the present invention is more likely to achieve a fast response.

ⅢThe liquid crystal composition provided by the present invention may further include one or more compounds represented by formula III

Ⅲ

Among them, R ₄ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and 1 having fluorine substituted carbon atoms. -9 alkoxy, 2-9 carbon alkenyl, fluorine-substituted alkenyl 2-9 carbon, 3-8 carbon alkenyl Alkenyloxy group having 3 to 8 carbon atoms;

表示1,4-亞苯基、1,4-亞環己基或1,4-亞環己烯基。

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexylene.

In the liquid crystal composition provided by the present invention, the compound of Formula III preferably has a mass content of 5-20%.

，The compound represented by the formula III is particularly preferably:

,

The optical anisotropy Δn of the compound shown in Formula III is moderate, the dielectric anisotropy Δε is between 5-9, the lower rotational viscosity γ ₁ , and the clear point CP is generally above 120 ° C, and can be used to adjust the mixed liquid crystal CP, Δn , Δε, γ ₁ and other parameters. Among the compounds represented by the formula III, compounds in which R ₁ represents a C ₁ -C ₅ linear alkyl group are preferred.

ⅣIn the liquid crystal composition provided by the present invention, one or more compounds of formula IV may be further added.

F

Among them, R ₅ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted by fluorine, an alkoxy group having 1 to 9 carbon atoms, and 1 having fluorine substituted carbon atoms. -9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms, or fluorine-substituted Alkenyloxy group having 3 to 8 carbon atoms;

n represents 0,1;

(F) represents H or F.

In the liquid crystal composition provided by the present invention, the compound of Formula IV preferably has a mass content of 5-20%.

Among the compounds represented by the formula IV, compounds in which R ₁ represents a C ₁ -C ₅ linear alkyl group are preferred. The compound represented by formula IV has a moderate Δε, a high CP, and a low viscosity is suitable for adjusting the viscosity, CP, Δε of the liquid crystal.

Ⅳ-1

Ⅳ-2

Ⅳ-3

Ⅳ-4 。The compound represented by the formula IV is further preferably:

IV-1

IV-2

IV-3

IV-4.

ⅤThe liquid crystal composition provided by the present invention may further add one or more compounds represented by formula V

Ⅴ

Among them, R ₆ and R ₇ each independently represent an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, or fluorine substituted Alkoxy having 1 to 9 carbon atoms, alkenyl having 2 to 9 carbon atoms, alkenyl having 2 to 9 carbon atoms substituted with fluorine, and 3 to 8 alkenyl carbon atoms Oxy or fluorine-substituted alkenyloxy having 3 to 8 carbon atoms;

Y ₃ and Y ₄ represent H or F, but cannot be F at the same time;

表示1,4-亞苯基、1,4-亞環己基或1,4-亞環己烯基。

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexylene.

In the liquid crystal composition provided by the present invention, the preferred mass content of the compound represented by Formula V is 2-15%.

The compound represented by the formula V is preferably a straight-chain alkyl compound in which R ₆ and R ₇ represent C ₁ -C ₅ . The compound represented by Formula V has a very high CP, which is beneficial to expanding the temperature range of liquid crystals.

。The compound represented by formula V is further preferably:

.

The compounds R ₆ and R ₇ represented by the formula V are preferably C ₁ -C ₅ straight-chain alkyl groups.

ⅥThe liquid crystal composition provided by the present invention may further add one or more compounds represented by formula VI

Ⅵ

Among them, R ₈ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and 1 having fluorine substituted carbon atoms. -9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms, or fluorine-substituted Alkenyloxy group having 3 to 8 carbon atoms;

表示1,4-亞苯基、1,4-亞環己基或1,4-亞環己烯基；

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene;

表示1,4-亞苯基、氟代1,4-亞苯基、1,4-亞環己基或1,4-亞環己烯基；

Represents 1,4-phenylene, fluoro1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene;

R ₉ represents F, an alkyl group having 1 to 9 carbon atoms, a fluorine-substituted alkyl group having 1 to 9 carbon atoms, an alkoxy group having 1 to 9 carbon atoms, and a fluorine-substituted carbon number 1 -9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms, or fluorine-substituted Alkenyloxy groups having 3 to 8 carbon atoms.

In the liquid crystal composition provided by the present invention, the preferred mass content of the compound represented by Formula VI is 5-30%.

Ⅵ-1

Ⅵ-2

Ⅵ-3

Ⅵ-4

Ⅵ-5。The compound represented by formula VI is further preferably:

Ⅵ-1

Ⅵ-2

Ⅵ-3

Ⅵ-4

Ⅵ-5.

The compounds shown by formulas VI-1 and VI-2 have a dielectric anisotropy Δε close to neutral, a low rotational viscosity γ ₁ , a high clear point, and a large K value, which can be used to adjust the K value of the liquid crystal and γ ₁ To achieve quick response. The terphenyl VI-5 compound has a large conjugate system, so it has a large optical anisotropy Δn, which is especially suitable for blending large-refractive-index mixed liquid crystals.

ⅦThe liquid crystal composition provided by the present invention may further add one or more compounds represented by formula (I)

Ⅶ

Among them, R ₁₀ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted by fluorine, an alkoxy group having 1 to 9 carbon atoms, and 1 having carbon atoms substituted with fluorine. -9 alkoxy, 2-9 carbon alkenyl, fluorine-substituted alkenyl 2-9 carbon, 3-8 carbon alkenyl or fluorine Alkenyloxy group having 3 to 8 carbon atoms;

表示1,4-亞苯基、氟代的1,4-亞苯基、1,4-亞環己基、1,4-亞環己烯基和/或1,4-亞環己基中一個或不相連的兩個CH₂ 被氧取代所形成的基團中的一種或多種；

Represents one of 1,4-phenylene, fluorinated 1,4-phenylene, 1,4-cyclohexylene, 1,4-cyclohexenyl, and / or 1,4-cyclohexylene One or more of the groups formed by the replacement of two unconnected CH ₂ with oxygen;

p represents 2 or 3.

According to the liquid crystal composition provided by the present invention, the preferred mass content of the compound represented by Formula (I) is 5-55%.

。The compound represented by formula Ⅶ is further preferably:

.

The compound represented by formula (I) has a large dielectric anisotropy Δε and a low rotational viscosity γ ₁ , and can be used to prepare a liquid crystal mixture to reduce the liquid crystal driving voltage and accelerate the response speed of the display element.

Ⅷ-1

Ⅷ-2

Ⅷ-3，The liquid crystal composition provided by the present invention may further include one or more formulas Ⅷ-1, Ⅷ-2 in addition to or including compounds represented by Formula III, Formula IV, Formula V, Formula VI, and Formula Ⅶ Cycloalkyl-containing compounds as shown in and / or Ⅷ-3

Ⅷ-1

Ⅷ-2

Ⅷ-3,

、

、

、

各自獨立地表示1,4-亞環己基、1,4-亞環己基中一個或兩個不相連的CH₂ 被O取代所形成的基團、1,4-亞苯基和/或氟代的1,4-亞苯基中的一種或多種；among them,

,

,

,

Each independently represents a group formed by 1, 4-cyclohexylene, 1, 4-cyclohexylene or one or two unconnected CH ₂ substituted with O, 1, 4-phenylene, and / or fluoro One or more of 1,4-phenylene;

Z ₁ , Z ₂ , and Z ₃ each independently represent a single bond, -CF ₂ O-, or -CH ₂ O-;

m, k, g each independently represents 1, 2 or 3;

i represents 0, 1, 2;

R ₁₁ represents F, an alkyl group having 1 to 9 carbon atoms, a fluorine-substituted alkyl group having 1 to 9 carbon atoms, an alkoxy group having 1 to 9 carbon atoms, and a fluorine-substituted carbon number 1 -9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms, or fluorine-substituted Alkenyloxy group having 3 to 8 carbon atoms;

R ₁₂ represents an alkyl group having 1-5 carbon atoms, a fluorine-substituted alkyl group having 1-5 carbon atoms, an alkoxy group having 1-5 carbon atoms, and a fluorine-substituted carbon number 1-5 Alkoxy, alkenyl having 2-5 carbon atoms, alkenyl having 2-5 carbon atoms substituted by fluorine, alkenyloxy group having 3-5 carbon atoms or fluorine-substituted carbon atoms Alkenyloxy groups of 3-5.

The compound represented by formula Ⅷ does not contain a soft terminal alkyl chain, so it has strong rigidity, and the relative interaction between liquid crystal molecules changes, showing a larger K value and a higher CP.

，The compound represented by Ⅷ-1 is preferably:

,

，The compound shown in Ⅷ-2 is preferably:

,

。The compound shown in Ⅷ-3 is preferably:

.

Different proportions of the various components of the liquid crystal composition will show slightly different properties, such as dielectric anisotropy Δε, optical anisotropy Δn, transition temperature point CP of the nematic conversion of liquid crystal to liquid, stability at low temperature It will be different and can be applied to different types of display elements, but the same feature is that its rotational viscosity γ _{1 is} low. Applied to liquid crystal display elements, it can realize fast response.

Dopants with various functions can be further added to the liquid crystal compounds provided by the present invention. The content of the dopants is preferably between 0.01-1%. These dopants are mainly antioxidants, ultraviolet absorbers, and chiral agents.

，

，

，

，

，

，The antioxidant and ultraviolet absorber are preferably:

,

,

,

,

,

,

S represents an integer of 1-10.

，

，

，

，

。The chiral agent is preferably (left-handed or right-handed):

,

,

,

,

.

The invention also relates to a liquid crystal display element or a liquid crystal display comprising any one of the liquid crystal compositions; the display element or display is an active matrix display element or display or a passive matrix display element or display.

The liquid crystal display element or liquid crystal display is preferably an active matrix addressing liquid crystal display element or a liquid crystal display.

The active matrix display element or display is specifically a TN-TFT or IPS-TFT liquid crystal display element or display.

The liquid crystal composition provided by the present invention has low viscosity and can achieve fast response, meanwhile, it has moderately large dielectric anisotropy Δε, large optical anisotropy Δn, high stability to heat and light, especially Suitable for fast response liquid crystal with low cell thickness.

The liquid crystal material containing the liquid crystal composition provided by the present invention has not only good chemical and thermal stability, but also stability to electric fields and electromagnetic radiation. Moreover, as a liquid crystal material for thin film transistor technology (TFT-LCD), it also has a wide nematic temperature range, suitable birefringence anisotropy, very high resistivity, good UV resistance, and high charge. Retention and low vapor pressure.

The present invention is further described below with reference to specific embodiments, but the present invention is not limited to the following embodiments. The methods are general methods unless otherwise specified. The raw materials can be obtained from publicly available sources unless otherwise specified. Unless otherwise stated, the percentages are all mass percentages.

In the following embodiments,

CP indicates a clear point, which is directly measured with a WRX-1S micro thermal analyzer, and the heating rate is set to 3 ° C / min.

Δn represents optical anisotropy (589nm, 20 ^o C),

Δε represents dielectric anisotropy (25 ° C, 1KHz, HP4284A, 5.2 micron TN left-handed box),

γ ₁ represents the rotational viscosity (mpas) at 20 ^o C, VHR (%) represents the charge retention rate (5V, 60Hz, 20 ° C), and ρ (× 10 ¹³ Ω · cm) represents the resistivity (20 ° C)

The tester and resistivity ρ (× 10 ¹³ Ω · cm) of the voltage holding rate VHR (%) are both TOYO06254 and TOYO6517 liquid crystal physical property evaluation systems (test temperature 20 ° C, time 16ms, and test box 7.0 microns).

The liquid crystal monomer structure of the examples of the present application is represented by a code, and the method for representing the structure of the liquid crystal ring structure, end groups, and linking groups is shown in the following table (a) and (b). If unnecessary, it can be removed.

Table (1): Corresponding codes of ring structure

Table (II): Corresponding codes of end groups and linking groups

C(5)CCV1For example:

C (5) CCV1

Comparative Example 1

Example 1

In Comparative Example 1, 15% of 2CC B (3F, 5F) BOCF _{3 was} replaced with 8% of 5CB B (3F, 5F) BCF ₃ + 7% of 3CBB (3F, 5F) BCF ₃ to obtain the composition of Example 1:

Δε [1KHz, 20 ℃]: 10.5

Δn [589nm, 20 ℃]: 0.120

K ₁₁ : 13.5

Cp: 120 ℃

γ ₁ : 140 mPa.s.

Obviously, gamma] ₁ of Example 1 of the liquid crystal decreases, Δn, K ₁₁ has been enhanced, especially for low cell thickness, quick response of the liquid crystal.

Comparative Example 2

Example 2

In Comparative Example 2, 7% of 3CCB (3F) B (3F, 4F, 5F) was replaced by 7% of 5CB B (3F, 5F) BCF ₃ and 9% of 5CCB (3F, 5F) BF was replaced by 9% of 5CBB (3F, 5F) BCF ₃ to obtain the composition of Example 2:

Δε [1KHz, 20 ℃]: 5.5

Δn [589nm, 20 ℃]: 0.105

Cp: 135 ℃

γ ₁ : 150 mPa.s.

Obviously, gamma] ₁ of Example 1 of the liquid crystal decreases, Δn, Δε has been enhanced, especially for low cell thickness, quick response of the liquid crystal.

Example 3

Example 4

Example 5

Example 6

Example 7

It can be seen from the above examples that the liquid crystal composition of the present invention has a lower rotational viscosity γ ₁ , a larger Δn, and a higher CP, and is particularly suitable for wide temperature display and low cell thickness liquid crystal display, suitable for TN, Liquid crystal material for IPS mode.

no

no

no

Claims (10)

A liquid crystal composition comprising one or more compounds represented by Formula I and one or more compounds represented by Formula II, and the liquid crystal composition comprises compounds represented by Formula II-A:

I

Ⅱ

II-A wherein R ₁ , R ₂ , and R ₃ each independently represent an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, and 1 to 9 carbon atoms Alkoxy, fluorine-substituted alkoxy having 1-9 carbon atoms, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, carbon number is 3-8 alkenyloxy or fluorine-substituted alkenyloxy having 3-8 carbon atoms; X represents H or F;

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexylene. The liquid crystal composition according to item 1 of the scope of patent application, wherein the one or more compounds represented by Formula I are one or more of the compounds represented by Formulas I1-I8:

I1

I2

I3

I4

I5

I6

I7

Ⅰ8 The one or more compounds represented by formula II include one or more compounds among the compounds represented by formula II1-II10,

II1

Ⅱ2

Ⅱ3

Ⅱ4

II5

II6

II7

Ⅱ8

II9

Ⅱ10. The liquid crystal composition according to item 1 or item 2 of the patent application scope, further comprising one or more compounds represented by formula III:

Ⅲ wherein R ₄ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and carbon atoms having fluorine substituted 1-9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms or fluorine substitution Alkenyloxy having 3 to 8 carbon atoms;

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexylene. The liquid crystal composition according to item 1 or item 2 of the patent application scope, further comprising one or more compounds represented by formula IV:

IV wherein R ₅ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and a fluorine substituted carbon number to 1-9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms or fluorine substitution Alkenyloxy having 3 to 8 carbon atoms; n represents 0 or 1; (F) represents H or F. The liquid crystal composition according to item 1 or item 2 of the patent application scope, further comprising one or more compounds represented by formula V:

Ⅴ wherein R ₆ and R ₇ each independently represent an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and fluorine Substituted alkoxy groups having 1-9 carbon atoms, alkenyl groups having 2-9 carbon atoms, alkenyl groups having 2-9 carbon atoms substituted by fluorine, and chains having 3-8 carbon atoms Alkenyloxy or fluorine-substituted alkenyloxy having 3 to 8 carbon atoms; Y ₃ and Y ₄ represent H or F, but not F at the same time;

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexylene. The liquid crystal composition according to item 1 or item 2 of the patent application scope, further comprising one or more compounds represented by formula VI:

Ⅵ wherein R ₈ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and a fluorine substituted carbon atom to 1-9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms or fluorine substitution Alkenyloxy having 3 to 8 carbon atoms; R ₉ represents F, alkyl having 1 to 9 carbon atoms, fluorine-substituted alkyl having 1 to 9 carbon atoms, and carbon number 1 to 1 9 alkoxy, fluorine-substituted alkoxy having 1-9 carbon atoms, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl group having 2-9 carbon atoms, carbon atoms 3-8 alkenyloxy or fluorine-substituted alkenyloxy having 3-8 carbon atoms;

Represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene;

Represents 1,4-phenylene, fluoro1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene. The liquid crystal composition according to item 1 or item 2 of the patent application scope, further comprising one or more compounds represented by formula (I):

Ⅶ Wherein, R ₁₀ represents an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, an alkoxy group having 1 to 9 carbon atoms, and a fluorine substituted carbon number to 1-9 alkoxy, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl having 2-9 carbon atoms, alkenyloxy having 3-8 carbon atoms or fluorine substitution Alkenyloxy having 3 to 8 carbon atoms;

Represents one of 1,4-phenylene, fluorinated 1,4-phenylene, 1,4-cyclohexylene, 1,4-cyclohexenyl, and / or 1,4-cyclohexylene One or more of the groups formed by the replacement of two unconnected CH ₂ with oxygen; p represents 2 or 3. The liquid crystal composition according to item 1 or item 2 of the patent application scope, which further comprises one or more compounds represented by formula Ⅷ-1, one or more compounds represented by formula Ⅷ-2, and / or one or more formula Compound shown in Ⅷ-3:

Ⅷ-1

Ⅷ-2

Ⅷ-3, where

,

,

,

Each independently represents a group formed by 1, 4-cyclohexylene, 1, 4-cyclohexylene or one or two unconnected CH ₂ substituted with O, 1, 4-phenylene, and / or fluoro One or more of 1,4-phenylene; Z ₁ , Z ₂ , Z ₃ each independently represent a single bond, -CF ₂ O- or -CH ₂ O-; m, k, g each independently represent 1, 2, or 3; i represents 0, 1, 2; R ₁₁ represents F, an alkyl group having 1 to 9 carbon atoms, an alkyl group having 1 to 9 carbon atoms substituted with fluorine, and 1 to 1 carbon atom 9 alkoxy, fluorine-substituted alkoxy having 1-9 carbon atoms, alkenyl having 2-9 carbon atoms, fluorine-substituted alkenyl group having 2-9 carbon atoms, carbon atoms Alkenyloxy group having 3 to 8 or fluorine-substituted alkenyloxy group having 3 to 8 carbons; R ₁₂ represents an alkyl group having 1 to 5 carbon atoms, and fluorine-substituted carbon number 1 to 1 5 alkyl groups, 1-5 carbon atoms, alkoxy groups substituted by fluorine, 1-5 carbon atoms, alkenyl groups substituted by 2-5 carbon atoms, fluorine substituted carbon atoms Alkenyl groups of 2-5, alkenyloxy groups of 3-5 carbon atoms or fluorine-substituted alkenyloxy groups of 3-5 carbon atoms. A liquid crystal display element includes the liquid crystal composition according to any one of claims 1 to 8 of the patent application scope. The liquid crystal display element is an active matrix display element or a passive matrix display element. The liquid crystal display element according to item 9 of the scope of the patent application, wherein the active matrix display element is a TN-TFT or IPS-TFT liquid crystal display element.