Positive dielectric anisotropy liquid crystal composition and liquid crystal display device

Abstract

The present invention relates to a liquid crystal composition and a liquid crystal display device having positive dielectric anisotropy. The liquid crystal composition comprises: 1-60% of at least one compound represented by Formula I and 1-30% of at least one compound represented by Formula II. The liquid crystal composition provided by the present invention exhibits fast response speed, excellent transmittance, good UV resistance, moderate dielectric anisotropy Δε, suitable optical anisotropy Δn, and high thermal and optical stability. #imgabs0#

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal materials, and more specifically to a liquid crystal composition and a liquid crystal display device. Background Art

[0002] Liquid crystal display devices are used in various household electrical appliances, industrial measuring instruments, automotive panels, mobile phones, smartphones, notebook personal computers, tablet PCs, televisions, and more, typified by clocks and desktop computers. Representative liquid crystal display methods include twisted nematic (TN), supertwisted nematic (STN), guest-host (GH), in-plane switching (IPS), fringe field switching (FFS), optically compensated birefringence (OCB), electrically controlled birefringence (ECB), vertical alignment (IVA), color super homeotropic (CSH), and ferroelectric liquid crystal (FLC). In addition, examples of driving methods include static driving, multiplexed driving, a simple matrix method, and an active matrix (AM) method using thin film transistors (TFT) or thin film diodes (TFD).

[0003] Currently, for small and medium-sized displays used in flat panels and smartphone displays, in-plane switching (IPS) and fringe field switching (FFS) modes are generally welcomed by industry researchers due to their wide viewing angles and higher transmittance and stability.

[0004] With the continuous development and progress of technology, in order to improve the performance of the display, apply to different application scenarios, and meet customers' higher requirements for the user experience, the ultraviolet radiation tolerance of the liquid crystal (longer service life), low threshold voltage (energy saving), high transmittance, low G1 / K 11 The requirements for value (fast response) are becoming more and more stringent.

[0005] Mixed crystal materials with positive dielectric anisotropy disclosed so far have difficulty in meeting all of these requirements. Therefore, in the field of liquid crystal materials, there is a need for new liquid crystal compositions with positive dielectric anisotropy and improved properties. Summary of the Invention

[0006] The object of the present invention is to provide a positive dielectric anisotropic liquid crystal composition having low viscosity, high resistivity, good low-temperature miscibility, fast response speed, excellent transmittance characteristics, and good UV resistance, and having at least one excellent performance that can be used in fast-response liquid crystal displays of various display modes. In particular, a positive dielectric anisotropic liquid crystal composition is provided that can significantly improve the display effect of liquid crystal displays when used in TN, IPS, and FFS mode displays.

[0007] The present inventors have conducted intensive studies to solve the above-mentioned problems and have found that the above-mentioned problems can be solved by using the positive dielectric anisotropic liquid crystal composition of the present application, thereby completing the present invention.

[0008] In one aspect, the present invention provides a positive dielectric anisotropic liquid crystal composition comprising a positive dielectric anisotropic liquid crystal compound and a compound having neutral dielectric anisotropy, wherein the positive dielectric anisotropic liquid crystal compound consists solely of at least one compound represented by formula I and at least one compound represented by formula II.

[0009] Relative to the positive dielectric anisotropic liquid crystal composition, the total amount of the compound represented by formula I is 1 to 60% by weight, and the total amount of the compound represented by formula II is 1 to 30%;

[0010]

[0011] In formula 1, R1 represents an alkenyl group having 2 to 5 carbon atoms, and q and p each independently represent 0 or 1;

[0012] In formula II, R2 represents an alkenyl group having 2 to 5 carbon atoms.

[0013] On the other hand, the present invention also provides a liquid crystal display device, which comprises the positive dielectric anisotropic liquid crystal composition of the present invention; the liquid crystal display device is an active matrix display device or a passive matrix display device.

[0014] Effects of the Invention

[0015] By using the positive dielectric anisotropic liquid crystal composition of the present invention, it is possible to obtain a positive dielectric anisotropic liquid crystal composition having low viscosity, high resistivity, good low-temperature miscibility, fast response speed, excellent transmittance characteristics, and good UV resistance. Such a composition can be used in at least one of the fast-response liquid crystal displays of various display modes, exhibiting excellent performance. Liquid crystal display devices employing such a positive dielectric anisotropic liquid crystal composition can significantly improve the display quality of the liquid crystal display, particularly when used in TN, IPS, or FFS mode displays. DETAILED DESCRIPTION

[0016] The following describes the implementation of the technical solution of the present application. It should be understood that the following implementation is only used to more clearly illustrate the technical solution of the present application, and is therefore only used as an example and cannot be used to limit the scope of protection of the present application.

[0017] [Positive dielectric anisotropic liquid crystal composition]

[0018] The positive dielectric anisotropic liquid crystal composition of the present invention contains a positive dielectric anisotropic liquid crystal compound, which is composed solely of at least one compound represented by Formula I and at least one compound represented by Formula II. That is, the positive dielectric anisotropic liquid crystal compound contained in the positive dielectric anisotropic liquid crystal composition of the present invention is at least one compound represented by Formula I and at least one compound represented by Formula II, and does not contain any other positive dielectric anisotropic liquid crystal compounds other than the compounds represented by Formula I and Formula II.

[0019]

[0020] In formula 1, R1 represents an alkenyl group having 2 to 5 carbon atoms, and q and p each independently represent 0 or 1;

[0021] In formula II, R2 represents an alkenyl group having 2 to 5 carbon atoms.

[0022] The positive dielectric anisotropic liquid crystal composition of the present invention may contain, in addition to the aforementioned positive dielectric anisotropic liquid crystal composition, a compound having neutral dielectric anisotropy. Alternatively, the positive dielectric anisotropic liquid crystal composition of the present invention may further contain a compound having negative dielectric anisotropy.

[0023] Dielectric anisotropy is the main parameter of the behavior of liquid crystal molecules in an electric field. / / , ε ⊥ represent the dielectric constants of the liquid crystal parallel and perpendicular to the molecular orientation, respectively. The dielectric anisotropy can be expressed as Δε=ε / / -ε ⊥Δε>0 is called positive dielectric anisotropy, and Δε<0 is called negative dielectric anisotropy. Under the action of an external electric field, liquid crystal molecules with positive dielectric anisotropy align along the field direction, while liquid crystal molecules with negative dielectric anisotropy align perpendicular to the field direction.

[0024] Generally, there are two methods for measuring dielectric constant: magnetic field method and electric field method. The magnetic field method is to make liquid crystal molecules undergo Freedericksz transformation under the action of magnetic field. Under the action of magnetic field, the direction of the director of positive liquid crystal rotates to be consistent with the direction of magnetic field. By calculating the capacitance, the ε under perpendicular magnetic field is measured. ⊥ When parallel to ε / / , calculate Δε. The electric field method is similar to the method under the action of a magnetic field, in that the liquid crystal molecules rotate under the action of an electric field. Measure the empty cell capacitance Co of the parallel cell and measure C at low voltage. ⊥ , then add a high voltage to make the liquid crystal molecules align with the electric field, and measure C / / , and then use C / / The linear relationship between C and 1 / V at high voltage is used to deduce Co and calculate ε. / / , ε ⊥ and Δε.

[0025] The "alkenyl group having 2 to 5 carbon atoms" represented by R1 may be a linear or branched alkenyl group, preferably a linear alkenyl group. Examples of such linear alkenyl groups include vinyl, 1E-propenyl, 2E-propenyl, 1E-butenyl, 2E-butenyl, 3E-butenyl, 1E-pentenyl, 2E-pentenyl, and 3E-pentenyl.

[0026] The "alkenyl group having 2 to 5 carbon atoms" represented by R2 may be a linear or branched alkenyl group, and is preferably a linear alkenyl group. Examples of such linear alkenyl groups include vinyl, 1E-propenyl, 2E-propenyl, 1E-butenyl, 2E-butenyl, 3E-butenyl, 1E-pentenyl, 2E-pentenyl, 3E-pentenyl, and 4E-pentenyl, and 2E-pentenyl is preferred.

[0027] In some embodiments of the positive dielectric anisotropic liquid crystal composition, the total amount of the compound represented by formula I is 1 to 60 wt %, and the total amount of the compound represented by formula II is 1 to 30 wt % relative to the positive dielectric anisotropic liquid crystal composition.

[0028] In some embodiments of the positive dielectric anisotropic liquid crystal composition, the composition of the components can be, for example, 1% to 60% by mass of the compound represented by Formula I; 1% to 30% by mass of the compound represented by Formula II; and 10% to 70% by mass of the compound with neutral dielectric anisotropy. In some preferred embodiments, the positive dielectric anisotropic liquid crystal composition contains 10% to 50% by mass of the compound represented by Formula I, 5% to 30% by mass of the compound represented by Formula II, and 25% to 60% by mass of the compound with neutral dielectric anisotropy.

[0029] In some embodiments, the compound represented by the aforementioned formula I is preferably at least one compound selected from the group consisting of the compounds represented by the following formulae I-1 to I-30.

[0030]

[0031]

[0032]

[0033]

[0034] In some embodiments, the compound represented by the aforementioned formula II is preferably at least one compound selected from the group consisting of the compounds represented by the following formulae II-1 to II-10.

[0035]

[0036]

[0037] In some embodiments, from the perspective of having better low-temperature miscibility, better anti-ultraviolet performance, faster response speed, and being suitable for at least one aspect of a fast-response liquid crystal display mode, it is preferred that the combination of the compound represented by the aforementioned formula I and the compound represented by the formula II is a combination of the following compounds, namely: a combination of at least one compound selected from the compounds represented by formula I-10, I-17, and I-27 and a compound represented by formula II-7. For example, it can be a combination of formula I-10 and formula II-7, a combination of formula I-17 and formula II-7, a combination of formula I-27 and formula II-7, a combination of formula I-10, formula I-17 and formula II-7, a combination of formula I-17, formula I-27 and formula II-7, a combination of formula I-10, formula I-27 and formula II-7, or a combination of formula I-10, formula I-17, and formula I-27 and formula II-7.

[0038]

[0039] By adopting such a combination, the positive dielectric anisotropic liquid crystal compound portion is composed only of these compounds. Since the end groups of these compounds are all 2E-pentenyl, the formulation system is simplified, the impurities introduced into the system are greatly reduced, the purity of the obtained mixed crystal is higher, and the production steps of the mixed crystal are reduced, the production process is simpler and more efficient, and the production cost is greatly reduced.

[0040] In some embodiments, the positive dielectric anisotropic liquid crystal composition optionally further comprises one or more compounds selected from the group consisting of compounds represented by the following formulae III-1 to III-7 as compounds with neutral dielectric anisotropy.

[0041]

[0042]

[0043] Among them, R 11 、R 12 Each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms.

[0044] The aforementioned "alkyl group having 1 to 5 carbon atoms" may be a linear alkyl group, a branched alkyl group, or a cycloalkyl group, and is preferably a linear alkyl group. Examples of the aforementioned linear alkyl group include methyl, ethyl, n-propyl, n-butyl, and n-pentyl. Methyl, ethyl, or n-propyl is preferred.

[0045] Examples of the "alkoxy group having 1 to 5 carbon atoms" include methoxy, ethoxy, n-propoxy, n-butoxy, and n-pentoxy. Preferred are methoxy, ethoxy, and n-propoxy.

[0046] The aforementioned "alkenyl group having 2 to 5 carbon atoms" may be a linear alkenyl group or a branched alkenyl group, preferably a linear alkenyl group. Examples of linear alkenyl groups include vinyl, 1E-propenyl, 2E-propenyl, 1E-butenyl, 2E-butenyl, 3E-butenyl, 1E-pentenyl, 2E-pentenyl, and 3E-pentenyl. Preferred are vinyl, 1E-propenyl, 3E-butenyl, and 3E-pentenyl.

[0047] The aforementioned "alkenyloxy group having 2 to 5 carbon atoms" may be a linear or branched alkenyloxy group, preferably a linear alkenyloxy group. Examples of such linear alkenyloxy groups include vinyloxy, 1E-propyleneoxy, 2E-propyleneoxy, 1E-butenyloxy, 2E-butenyloxy, 3E-butenyloxy, 1E-pentenyloxy, 2E-pentenyloxy, and 3E-pentenyloxy groups. Preferred are vinyloxy, 1E-propyleneoxy, 3-butenyloxy, and 3-pentenyloxy groups.

[0048] In some embodiments of the positive dielectric anisotropic liquid crystal composition, in addition to the aforementioned positive dielectric anisotropic liquid crystal compounds and compounds with neutral dielectric anisotropy, negative dielectric anisotropic liquid crystal compounds may optionally be contained. For example, in some embodiments, optionally, the positive dielectric anisotropic liquid crystal composition may further contain one or more liquid crystal compounds with negative dielectric anisotropy, but the liquid crystal composition as a whole still displays positive dielectric anisotropy. By also including a compound with negative dielectric anisotropy (-Δε) in the positive dielectric anisotropic liquid crystal composition, the transmittance and other properties of the liquid crystal composition with positive dielectric anisotropy (+Δε) can be improved. For example, in the case of using a positive dielectric anisotropic liquid crystal composition in the FFS display mode, the transmittance is proportional to the perpendicular dielectric ε. ⊥ The ratio of dielectric anisotropy Δε is:

[0049] T∝ε ⊥ / Δε;Δε=ε ∥ -ε ⊥

[0050] Where T represents transmittance, ε ⊥ represents the vertical dielectric, ε ∥ represents parallel dielectric.

[0051] From the above formula, it can be seen that increasing the vertical dielectric ε of the liquid crystal composition ⊥ It is beneficial to increase the transmittance of liquid crystal displays. Negative dielectric anisotropy compounds have high vertical dielectric constants. Adding negative dielectric anisotropy liquid crystal components can effectively increase the vertical dielectric constant of the liquid crystal system, thereby effectively increasing the transmittance of liquid crystal displays.

[0052] In some embodiments, the positive dielectric anisotropic liquid crystal composition may optionally further contain at least one compound represented by the following formula IV, for example, as a compound having negative dielectric anisotropy.

[0053]

[0054] In formula IV, R7 and R8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms;

[0055] Z1 and Z2 each independently represent a single bond, -OCH2- or -CH2O-;

[0056] Ring A and Ring B each independently represent 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-cyclohexenylene, 1,4-phenylene or fluorinated 1,4-phenylene;

[0057] m represents 0, 1, or 2; n represents 0 or 1.

[0058] The aforementioned "alkyl group having 1 to 5 carbon atoms" may be a linear alkyl group, a branched alkyl group, or a cycloalkyl group, and is preferably a linear alkyl group. Examples of the aforementioned linear alkyl group include methyl, ethyl, n-propyl, n-butyl, and n-pentyl groups. Methyl, ethyl, or n-propyl groups are preferred.

[0059] Examples of the "alkoxy group having 1 to 5 carbon atoms" include methoxy, ethoxy, n-propoxy, n-butoxy, and n-pentoxy, preferably methoxy, ethoxy, or n-propoxy.

[0060] The aforementioned "alkenyl group having 2 to 5 carbon atoms" may be a linear alkenyl group or a branched alkenyl group, preferably a linear alkenyl group. Examples of linear alkenyl groups include vinyl, 1E-propenyl, 2E-propenyl, 1E-butenyl, 2E-butenyl, 3E-butenyl, 1E-pentenyl, 2E-pentenyl, and 3E-pentenyl. Preferred are vinyl, 1E-propenyl, 3E-butenyl, and 3E-pentenyl.

[0061] The aforementioned "alkenyloxy group having 2 to 5 carbon atoms" may be a linear or branched alkenyloxy group, preferably a linear alkenyloxy group. Examples of such linear alkenyloxy groups include vinyloxy, 1E-propyleneoxy, 2E-propyleneoxy, 1E-butenyloxy, 2E-butenyloxy, 3E-butenyloxy, 1E-pentenyloxy, 2E-pentenyloxy, and 3E-pentenyloxy groups. Preferred are vinyloxy, 1E-propyleneoxy, 3E-butenyloxy, and 3E-pentenyloxy groups.

[0062] The compound represented by the aforementioned formula IV is preferably at least one compound selected from the group consisting of the compounds represented by the following formulae IV-1 to IV-18.

[0063]

[0064]

[0065]

[0066] The definitions of R7 and R8 are the same as above.

[0067] In some embodiments, the positive dielectric anisotropic liquid crystal composition may optionally further contain, for example, at least one compound selected from the following formulas V-1 to V-126 as a negative dielectric anisotropic liquid crystal compound.

[0068]

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

[0083]

[0084] In some embodiments, the positive dielectric anisotropic liquid crystal composition may optionally further contain, for example, at least one compound selected from the compounds represented by the following formulae VI-1 to VI-72 as a negative dielectric anisotropic liquid crystal compound.

[0085]

[0086]

[0087]

[0088]

[0089]

[0090]

[0091]

[0092]

[0093]

[0094]

[0095] In some embodiments, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0096] 1% to 60% of the compound represented by formula I;

[0097] 1% to 30% of the compound represented by formula II; and

[0098] 10% to 70% of the compound represented by formula III.

[0099] In some preferred embodiments, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0100] 10% to 50% of the compound represented by formula I;

[0101] 5% to 30% of the compound represented by formula II; and

[0102] 25% to 60% of the compound represented by formula III.

[0103] In another preferred embodiment, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0104] 1% to 60% of the compound represented by formula I;

[0105] 1% to 30% of the compound represented by formula II;

[0106] 10% to 60% of the compound represented by formula III; and

[0107] 1% to 20% of the compound represented by formula IV.

[0108] Further preferably, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0109] 10% to 50% of the compound represented by formula I;

[0110] 5% to 25% of the compound represented by formula II;

[0111] 20% to 50% of the compound represented by formula III; and

[0112] 1% to 15% of the compound represented by formula IV.

[0113] In another preferred embodiment, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0114] 1% to 60% of the compound represented by formula I;

[0115] 1% to 30% of the compound represented by formula II;

[0116] 10% to 60% of the compound represented by formula III;

[0117] 1% to 20% of the compound represented by formula IV; and

[0118] 1% to 10% of the compound represented by formula V.

[0119] Further preferably, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0120] 10% to 50% of the compound represented by formula I;

[0121] 5% to 25% of the compound represented by formula II;

[0122] 20% to 50% of the compound represented by formula III;

[0123] 1% to 10% of the compound represented by formula IV; and

[0124] 1% to 7.5% of the compound represented by formula V.

[0125] In another preferred embodiment, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0126] 1% to 60% of the compound represented by formula I;

[0127] 1% to 30% of the compound represented by formula II;

[0128] 10% to 60% of the compound represented by formula III;

[0129] 1% to 20% of the compound represented by formula IV;

[0130] 1% to 10% of the compound represented by formula V and

[0131] 1% to 10% of the compound represented by formula VI.

[0132] Further preferably, the positive dielectric anisotropic liquid crystal composition comprises the following components in percentage by mass:

[0133] 10% to 50% of the compound represented by formula I;

[0134] 5% to 25% of the compound represented by formula II;

[0135] 20% to 50% of the compound represented by formula III;

[0136] 1% to 10% of the compound represented by formula IV;

[0137] 1% to 7.5% of the compound represented by formula V; and

[0138] 1% to 5% of the compound represented by formula VI.

[0139] The positive dielectric anisotropic liquid crystal composition of the present invention exhibits low viscosity, high resistivity, good low-temperature miscibility, fast response speed, excellent transmittance, and good UV resistance, and can be used in various display modes for fast-response liquid crystal displays, particularly in TN, IPS, and FFS mode displays. The positive dielectric anisotropic liquid crystal composition significantly reduces development residue in the liquid crystal display, exhibiting excellent transmittance and UV resistance.

[0140] [Liquid Crystal Display Devices]

[0141] A second aspect of the present invention provides a liquid crystal display device, which is not particularly limited as long as it comprises any of the above-described positive dielectric anisotropic liquid crystal compositions. The liquid crystal display device of the present invention may be an active matrix display device or a passive matrix display device. Those skilled in the art will be able to select an appropriate liquid crystal display component and liquid crystal display structure based on the desired performance.

[0142] Example

[0143] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the following specific description is illustrative rather than restrictive and should not be used to limit the scope of protection of the present invention.

[0144] In the present invention, the preparation methods are conventional methods unless otherwise specified, the raw materials used can be obtained from public commercial channels unless otherwise specified, percentages are by mass, temperatures are in degrees Celsius (°C), and liquid crystal compounds are also liquid crystal monomers.

[0145] The temperature unit in each embodiment is ° C. The specific meanings of other symbols and test conditions are as follows:

[0146] Cp represents the clearing point of liquid crystal (°C), and the testing instrument is a Mettler-Toledo-FP System microthermal analyzer.

[0147] Δn represents optical anisotropy, Δn=n e -n o , where n o is the refractive index of ordinary light, ne is the refractive index of extraordinary light, tested under the following conditions: 589nm, 25±0.2℃.

[0148] Δε represents dielectric anisotropy, Δε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis, test conditions: 25°C, INSTEC:ALCT-IR1, 18 μm vertical cell;

[0149] K 11 is the torsional elastic constant, K 33 is the splay elastic constant, the test conditions are: 25°C, INSTEC:ALCT-IR1, 18 μm vertical cell;

[0150] G1 (mPa.s) represents the rotational viscosity coefficient of the liquid crystal compound. The measurement method is: instrument INSTEC: ALCT-IR1, test box thickness 18 micron vertical box, temperature 25 ° C, abbreviated as "G1".

[0151] The preparation method of the liquid crystal composition is as follows: the monomers are weighed according to a certain ratio and placed in a stainless steel beaker. The stainless steel beaker containing the monomers is placed on a magnetic stirring device to heat and melt. After most of the monomers in the stainless steel beaker are melted, a magnetic rotor is added to the stainless steel beaker, and the mixture is stirred evenly. After cooling to room temperature, the liquid crystal composition is obtained.

[0152] The obtained liquid crystal composition was filled between two substrates of a liquid crystal display for performance testing.

[0153] The structures of the liquid crystal monomers used in the examples of the present invention are represented by the following codes. The code representations of the liquid crystal ring structure, end group, and linking group are shown in Tables (I) and (II) below.

[0154] Table 1: Corresponding codes of ring structures

[0155]

[0156]

[0157] Table 2: Corresponding codes of end groups and linking groups

[0158]

[0159]

[0160] For example:

[0161]

[0162] Positive dielectric anisotropic liquid crystal compositions of different compositions were prepared in the Examples and Comparative Examples. The monomer structure, amount (parts by mass) of the specific compounds used in each example, and the test results of the performance parameters of the obtained liquid crystal compositions are shown in the following table.

[0163] Table 1: Component ratio of the liquid crystal composition of Example 1

[0164] General formula of compound Structural formula parts by mass Performance parameters Parameter value Ⅰ PGUQU-1V2-F 20.0 Cp(℃) 72.9 Ⅰ PUQU-1V2-F 20.0 Δn 0.1499 II PGU-1V2-F 20.0 Δε 13.9 III CC-3-V 30.0 <![CDATA[ε ⊥ ]]> 2.8 III PP-1V2-2V1 5.0 <![CDATA[K 11 (pN)]]> 14.8 III CCP-3-2V1 5.0 G1(mPa.s) 64.9 <![CDATA[G1 / K 11 ]]> 4.39 <![CDATA[ε ⊥ / No]]> 0.20 VHR (%) 99.5

[0165] Table 2: Component ratio of the liquid crystal composition of Example 2

[0166] Compound formula Liquid crystal structure parts by mass Performance parameters Parameter value Ⅰ PGUQU-1V2-F 20.0 Cp(℃) 70.5 Ⅰ PUQU-1V2-F 25.0 Δn 0.1489 II PGU-1V2-F 20.0 Δε 13.8 III CC-3-V 20.0 <![CDATA[ε ⊥ ]]> 3.2 III PP-1V2-2V1 5.0 <![CDATA[K 11 (pN)]]> 14.5 III CLP-3-1 5.0 G1(mPa.s) 74.5 IV PYP-3-O2 5.0 <![CDATA[G1 / K 11 ]]> 5.14 <![CDATA[ε ⊥ / No]]> 0.23 VHR (%) 99.3

[0167] Table 3: Component ratio of the liquid crystal composition of Example 3

[0168]

[0169] Table 4: Component ratio of the liquid crystal composition of Example 4

[0170] Compound formula Liquid crystal structure parts by mass Performance parameters Parameter value Ⅰ PGUQU-1V2-F 22.0 Cp(℃) 70.1 Ⅰ PUQU-1V2-F 20.0 Δn 0.1509 II PGU-1V2-F 25.0 Δε 13.9 III CC-3-V 14.0 <![CDATA[ε ⊥ ]]> 3.7 III CC-2-3 6.0 <![CDATA[K 11 (pN)]]> 14.6 III CPP-3-2V1 5.0 G1(mPa.s) 77.5 IV PYP-3-O2 2.5 <![CDATA[G1 / K 11 ]]> 5.30 V COBOIC-2-3 2.5 <![CDATA[ε ⊥ / No]]> 0.27 VI B(S)-3O-O2 3.0 VHR (%) 99.0

[0171] Table 5: Component ratio of the liquid crystal composition of Comparative Example 1

[0172] General formula of compound Liquid crystal structure parts by mass Performance parameters Parameter value PGUQU-3-F 20.0 Cp(℃) 70.0 PUQU-3-F 20.0 Δn 0.1482 PGU-3-F 20.0 Δε 14.1 III CC-3-V 30.0 ε⊥ 2.7 III PP-1V2-2V1 5.0 <![CDATA[K 11 (pN)]]> 12.0 III CCP-3-2V1 5.0 G1(mPa.s) 66.5 <![CDATA[G1 / K 11 ]]> 5.52 <![CDATA[ε ⊥ / No]]> 0.19 VHR (%) 98.0

[0173] By comparing the embodiment with the comparative example 1, it can be seen that the liquid crystal composition of the embodiment has a lower G1λK than that of the comparative example 1. 11 Since the response speed of the LCD panel is proportional to G1 / K 11 Therefore, when the liquid crystal composition of the embodiment is used in a liquid crystal display, a response speed improved compared with that of Comparative Example 1 can be obtained. In addition, compared with Comparative Example 1, the liquid crystal composition of the embodiment has a higher ε ⊥ / Δε value, and transmittance T∝ε ⊥ / Δε, therefore, when used in a liquid crystal display, the liquid crystal composition of the embodiment can obtain a higher transmittance than that of Comparative Example 1. In addition, compared with Comparative Example 1, the liquid crystal composition of the embodiment also has a higher VHR value, therefore, compared with Comparative Example 1, the liquid crystal composition of the embodiment can obtain better ultraviolet radiation resistance.

Claims

1. A positive dielectric anisotropic liquid crystal composition, characterized in that: It contains a positive dielectric anisotropic liquid crystal compound and a compound with neutral dielectric anisotropy, wherein the positive dielectric anisotropic liquid crystal compound is composed only of at least one compound represented by formula I and at least one compound selected from the compounds represented by the following formulas II-2 to II-10. Relative to the positive dielectric anisotropic liquid crystal composition, the content of the compound represented by formula I is 1 to 60% by weight, and the content of the compounds represented by formulas II-2 to II-10 is 1 to 30%; In formula 1, R1 represents an alkenyl group having 2 to 5 carbon atoms, and q and p each independently represent 0 or 1; 2. The positive dielectric anisotropic liquid crystal composition according to claim 1, wherein The compound represented by formula I is at least one compound selected from the following formulas I-1 to I-30.

3. The positive dielectric anisotropic liquid crystal composition according to claim 1, wherein The compound with neutral dielectric anisotropy comprises one or more compounds selected from the group consisting of compounds represented by formulae III-1 to III-7. Among them, R 11 、R 12 Each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms.

4. The positive dielectric anisotropic liquid crystal composition according to claim 3, further comprising at least one compound represented by the following formula IV: In formula IV, R7 and R8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms; Z1 and Z2 each independently represent a single bond, -OCH2- or -CH2O-; Ring A and Ring B each independently represent 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene or fluorinated 1,4-phenylene; m represents 0, 1, or 2; n represents 0 or 1.

5. The positive dielectric anisotropic liquid crystal composition according to claim 4, wherein The compound represented by formula IV is at least one compound selected from the following formulas IV-1 to IV-18. R7 and R8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms.

6. The positive dielectric anisotropic liquid crystal composition according to claim 4, wherein It also contains at least one compound selected from the following formulas V-1 to V-126, 7. The positive dielectric anisotropic liquid crystal composition according to claim 6, further comprising at least one compound selected from the group consisting of the compounds represented by the following formulae VI-1 to VI-72:

8. The positive dielectric anisotropic liquid crystal composition according to claim 1 or 2, comprising the following components in percentage by mass: 1% to 60% of the compound represented by formula I; 1% to 30% of a compound selected from formula II-2 to II-10; and 10% to 70% of the compounds have neutral dielectric anisotropy.

9. The positive dielectric anisotropic liquid crystal composition according to claim 8, comprising the following components in percentages by mass: 10% to 50% of the compound represented by formula I; 5% to 30% of the compounds represented by formula II-2 to II-10; and 25% to 60% of the compounds have neutral dielectric anisotropy.

10. The positive dielectric anisotropic liquid crystal composition according to claim 4, comprising the following components in percentage by mass: 1% to 60% of the compound represented by formula I; 1% to 30% of the compounds represented by formulas II-2 to II-10; 10% to 60% of the compounds represented by formula III-1 to III-7; and 1% to 20% of the compound represented by formula IV.

11. The positive dielectric anisotropic liquid crystal composition according to claim 10, comprising the following components in percentage by mass: 10% to 50% of the compound represented by formula I; 5% to 25% of the compounds represented by formula II-2 to II-10; 20% to 50% of the compounds represented by formula III-1 to III-7; and 1% to 15% of the compound represented by formula IV.

12. The positive dielectric anisotropic liquid crystal composition according to claim 6, comprising the following components in percentage by mass: 1% to 60% of the compound represented by formula I; 1% to 30% of the compounds represented by formulas II-2 to II-10; 10% to 60% of the compounds represented by formulas III-1 to III-7; 1% to 20% of the compound represented by formula IV; and 1% to 10% of the compounds represented by formula V-1 to V-126.

13. The positive dielectric anisotropic liquid crystal composition according to claim 12, comprising the following components in percentages by mass: 10% to 50% of the compound represented by formula I; 5% to 25% of the compounds represented by formula II-2 to II-10; 20% to 50% of the compounds represented by formulas III-1 to III-7; 1% to 10% of the compound represented by formula IV; and 1% to 7.5% of the compounds represented by formula V-1 to V-126.

14. The positive dielectric anisotropic liquid crystal composition according to claim 7, wherein: The liquid crystal composition comprises the following components in percentage by mass: 1% to 60% of the compound represented by formula I; 1% to 30% of the compounds represented by formulas II-2 to II-10; 10% to 60% of the compounds represented by formulas III-1 to III-7; 1% to 20% of the compound represented by formula IV; 1% to 10% of the compounds represented by formulas V-1 to V-126 and, 1% to 10% of the compounds represented by formulas VI-1 to VI-72.

15. The positive dielectric anisotropic liquid crystal composition according to claim 14, wherein The liquid crystal composition comprises the following components in percentage by mass: 10% to 50% of the compound represented by formula I; 5% to 25% of the compounds represented by formula II-2 to II-10; 20% to 50% of the compounds represented by formulas III-1 to III-7; 1% to 10% of the compound represented by formula IV; 1% to 7.5% of the compounds represented by formulas V-1 to V-126; and 1% to 5% of the compounds represented by formulas VI-1 to VI-72.

16. A liquid crystal display device, characterized in that: The liquid crystal display device comprises the positive dielectric anisotropic liquid crystal composition according to any one of claims 1 to 15; the liquid crystal display device is an active matrix display device or a passive matrix display device.

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