Liquid crystal composition and liquid crystal display device

Abstract

The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition includes at least one compound of general formula I and at least one compound of general formula II. The present invention provides a liquid crystal composition that has a K ave value is large, and ε ⊥ Since it has high conductivity, small light scattering, and suitable optical anisotropy and clearing point, a liquid crystal display device containing it has good transmittance and contrast, and is suitable for VA, IPS or FFS type display devices.

Description

[Technical Field]

[0001] The present invention belongs to the technical field of liquid crystal displays, and specifically relates to liquid crystal compositions and liquid crystal display devices. [Background technology]

[0002] Liquid crystal display devices are used in a variety of household appliances, including watches and calculators, measuring instruments, automotive panels, word processors, computers, printers, and televisions. Depending on the display mode, liquid crystal displays are classified into types such as PC (phase change), TN (twist nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), and VA (vertical alignment). Depending on the device's driving method, liquid crystal displays are classified into PM (passive matrix) and AM (active matrix). PMs are classified into static and multiplex types. AMs are classified into TFT (thin film transistor) and MIM (metal-insulator-metal) types. TFT types include amorphous silicon and polycrystalline silicon. The latter can be divided into high-temperature and low-temperature types depending on the manufacturing process. Liquid crystal display devices can be divided into reflective types that use natural light, transmissive types that use backlight, and transflective types that use both natural light and backlight depending on the type of light source.

[0003] The optical anisotropy of a liquid crystal composition is related to the contrast of the device. Depending on the display mode of the device, a large or small optical anisotropy (i.e., an appropriate optical anisotropy) is required. The product (Δn×d) of the optical anisotropy (Δn) of the composition and the cell thickness (d) of the device is designed to maximize the contrast. The appropriate value of the product depends on the type of operation mode, but for devices with small cell thicknesses, liquid crystal compositions with large optical anisotropy are preferred.

[0004] Contrast is the ratio between the brightest and darkest areas; the higher the ratio, the more gradations from black to white there are and the richer the colors are. Contrast has a very important effect on visual effects; generally, the higher the contrast, the clearer and more striking the image will be, and the colors will be clearer and more beautiful; however, the lower the contrast, the more blurred the entire screen will be. High contrast contributes greatly to image clarity, detail expression, and gradation expression. The higher the contrast, the better the image effect and the more saturated the colors will be; conversely, the lower the contrast, the more blurred the screen will appear and the colors will be less clear.

[0005] A liquid crystal display element containing a liquid crystal composition having a large absolute value of dielectric anisotropy can reduce the base voltage value, the driving voltage, and further reduce power consumption.

[0006] Liquid crystal display devices containing liquid crystal compositions with low threshold voltages can effectively reduce display power consumption and have longer battery life, especially in consumable products (e.g., portable electronic products such as mobile phones and tablet computers). However, liquid crystal compositions with low threshold voltages (which generally contain large dielectric polar groups) have a low degree of order in their liquid crystal molecules, and the K ave The value also decreases, which affects the light leakage and contrast of the liquid crystal material, and it is usually difficult to achieve both of these at the same time.

[0007] Based on measurements of the light leakage performance of conventional IPS-LCDs, those skilled in the art have found that the main causes of the light leakage problem in LCDs are light scattering (LC scattering), rubbing uniformity, light leakage from color filter films (CF / TFT scattering), and polarizing ability, with light scattering accounting for 63% of the factors affecting light leakage performance.

[0008] The following relational expression

number

[0009] The relationship between contrast (CR) and brightness (L) is: CR=L 255 / L0×100% where L 255 is the on-state luminance, and L0 is the off-state luminance. It can be seen that the change in L0 has a significant effect on CR. In the off-state, L0 is not related to the dielectric constant characteristics of the liquid crystal molecules, but is related to the LC scattering of the liquid crystal material itself. The smaller the LC scattering, the smaller L0 becomes, which significantly improves CR.

[0010]

number

[0011] In view of the drawbacks of the prior art, the object of the present invention is to provide a liquid crystal composition and a liquid crystal display device. In the present invention, by designing the components of the liquid crystal composition, the liquid crystal composition produced has a K ave value is large, and ε ⊥ The film has high conductivity, small light scattering, suitable optical anisotropy and clearing point, and is suitable for VA, IPS or FFS type display devices. [Means for solving the problem]

[0012] To achieve this goal, the present invention employs the following technical solutions.

[0013] In a first aspect, the present invention provides a liquid crystal composition, the liquid crystal composition comprising at least one compound of general formula I and at least one compound of general formula II, [ka] wherein R1 is a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; a halogenated or non-halogenated branched-chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; [ka] wherein one or at least two non-adjacent —CH— groups in the halogenated or non-halogenated linear alkyl group containing 1 to 12 carbon atoms or the halogenated or non-halogenated branched alkyl group containing 3 to 12 carbon atoms are each independently optionally substituted with a —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO— group; R 11 teeth, [ka] X1 represents -O- or -S-; n 11 represents 0, 1, 2, 3 or 4, [ka] teeth, [ka] represents R2 and R3 each independently represent a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] wherein one or at least two non-adjacent —CH— groups in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms are each independently optionally substituted with a —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO— group; [ka] teeth, [ka] represents the above [ka] one or at least two -CH2- groups may each independently be replaced by -O-, and one or at least two single bonds in the ring may each independently be replaced by a double bond; [ka] one or at least two -H in the ring may each independently be replaced with -F, -Cl, -CN, -CH3, or -OCH3, and one or at least two -CH= in the ring may each independently be replaced with -N=; L1 to L4 each independently represent a halogen atom; X2 represents -O- or -S-, X3 represents -O- or -CH2-, Z1 represents a single bond, -CO-O-, -O-CO-, -CHO-, -OCH-, -CH=CH-, -C≡C-, -CHCH-, -CFCF-, -(CH)-, -CFO- or -OCF-; n1 represents 0, 1 or 2, and when n1 represents 2, [ka] may be the same or different, Z1 may be the same or different, and n2 represents 1 or 2.

[0014] In the present invention, by designing the components of the liquid crystal composition, the liquid crystal composition produced has a K ave value is large, and ε ⊥ The film has high conductivity, small light scattering, suitable optical anisotropy and clearing point, and is suitable for VA, IPS or FFS type display devices.

[0015] The halogen atoms include fluorine atoms, halogen atoms, bromine atoms, and iodine atoms (the same applies hereinafter).

[0016] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The following preferred technical solutions can better achieve and realize the objectives and beneficial effects of the present invention.

[0017] In some embodiments of the present invention, the compound of general formula I is [ka] [ka] Any one or a combination of at least two compounds having the structure wherein [ka] X1, X2, L1, L2, Z1 and n 11 has the same scope of protection as above.

[0018] In some embodiments of the present invention, [ka] teeth, [ka] Represents.

[0019] In some embodiments of the present invention, both L1 and L2 represent a fluorine atom.

[0020] In some embodiments of the present invention, the compound of formula I is a compound of formula I-1 or a compound of formula I-9.

[0021] In some embodiments of the present invention, the liquid crystal composition comprises at least two compounds having the general formula I-1 and / or at least two compounds having the general formula I-9.

[0022] In some embodiments of the present invention, the weight percentage of the compound of general formula I in the liquid crystal composition is 0.1% to 35%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 25%, 26%, 28%, 30%, 32%, or 35%, and more preferably 2% to 25%.

[0023] In some embodiments of the present invention, the content of the compound of general formula I is preferably adjusted so that the liquid crystal composition containing it has a suitable optical anisotropy, a suitable clearing point, a high ε ⊥ , large K ave value, has small light scattering.

[0024] In some embodiments of the present invention, the compound of general formula II is [ka] The compound is any one of the compounds or a combination of at least two of the compounds.

[0025] In some embodiments of the present invention, both L3 and L4 represent a fluorine atom.

[0026] In some embodiments of the present invention, the compound of general formula II includes the compound of general formula II-2 and / or the compound of general formula II-4.

[0027] In some embodiments of the present invention, the liquid crystal composition comprises at least two (eg, may be two, three, four, or five) compounds of general formula II.

[0028] In some embodiments of the present invention, the compound of general formula II comprises at least one compound selected from the group consisting of compounds of general formula II-1 and general formula II-3, and at least one compound selected from the group consisting of compounds of general formula II-2 and general formula II-4.

[0029] In some embodiments of the present invention, the weight percentage of the compound of general formula II in the liquid crystal composition is 0.1% to 60%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 6%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60%, and more preferably 8% to 60%.

[0030] In some embodiments of the present invention, the content of the compound of general formula II is preferably adjusted so that the liquid crystal composition containing it has a suitable optical anisotropy, a suitable clearing point, a high ε ⊥ , large K ave value, adjusted to have low light scattering.

[0031] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula N, [ka] In the formula, R N1 and R N2 are each independently a straight-chain alkyl group containing 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched-chain alkyl group containing 3 to 12 carbon atoms, [ka] wherein one or two or more non-adjacent —CH— groups in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms may be each independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —CO-O—, or —O-CO-; [ka] are each independently, [ka] represents [ka] one or at least two -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; [ka] one or at least two -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring may each independently be replaced by -N=; Z N1 and Z N2 each independently represents a single bond, -CO-O-, -O-CO-, -CH=CH-, -C≡C-, -CFCF-, -(CH)-, -CFO-, or -OCF-; L N1 and L N2 each independently represents —H, an alkyl group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms, or a halogen atom; and n N1 represents 0, 1, 2 or 3, and n N2 represents 0 or 1, and 0≦n N1 +n N2 ≦3, and n N1 If represents 2 or 3, [ka] may be the same or different, and Z N1 may be the same or different.

[0032] In some embodiments of the present invention, the compound of general formula N is [ka] [ka] [ka] The compound is any one or a combination of at least two of the compounds having the structure:

[0033] In some embodiments of the present invention, the compound of general formula N is selected from the group consisting of a compound of general formula N-2, a compound of general formula N-3, a compound of general formula N-7, a compound of general formula N-10, a compound of general formula N-13, a compound of general formula N-15, and a compound of general formula N-17.

[0034] In some embodiments of the present invention, the weight percentage of the compound of general formula N in the liquid crystal composition is 0.1% to 50%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 6%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50%, and more preferably 2% to 45%.

[0035] In some embodiments of the present invention, the content of the compound of general formula N is preferably adjusted so that the liquid crystal composition containing it has a suitable optical anisotropy, a suitable clearing point, a high ε ⊥ , large K ave value, has small light scattering.

[0036] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula M, [ka] In the formula, R M1 and R M2 are each independently a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] wherein one or at least two non-adjacent —CH— groups in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms may each independently be replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O—, or —O—CO—; [ka] are each independently, [ka] represents [ka] one or at least two -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; [ka] wherein at most one -H may be replaced by a halogen atom; Z M1 and Z M2 each independently represent a single bond, —CO—O—, —O—CO—, —CHO—, —OCH—, —C≡C—, —CH═CH—, —CHCH—, or —(CH)—; and n M represents 0, 1 or 2, n M If represents 2, [ka] may be the same or different, and Z M2 may be the same or different.

[0037] In some embodiments of the present invention, the compound of general formula M is [ka] [ka] [ka] The compound is any one or a combination of at least two of the compounds having the structure:

[0038] In some embodiments of the invention, the compound of general formula M is selected from the group consisting of compounds of general formula M-1, compounds of general formula M-2, compounds of general formula M-4, compounds of general formula M-11, compounds of general formula M-13, compounds of general formula M-21, compounds of general formula M-23, compounds of general formula M-24, and compounds of general formula M-27.

[0039] In some embodiments of the present invention, the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1% to 60%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 6%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60%, and more preferably 30% to 50%.

[0040] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula B, [ka] In the formula, R B1 and R B2 each independently represents a halogen atom, —CF3, —OCF3, a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] and the linear alkyl group containing 1 to 12 carbon atoms, the branched alkyl group containing 3 to 12 carbon atoms, [ka] one or at least two non-adjacent —CH2— groups may each independently be replaced by —O—, —CO—, —CO—O—, or —O—CO—; a linear alkyl group containing 1 to 12 carbon atoms; a branched alkyl group containing 3 to 12 carbon atoms; [ka] one or at least two non-adjacent -CH- groups may each independently be replaced by -CH=CH- or -C≡C-; [ka] are each independently, [ka] represents [ka] one or at least two non-adjacent -CH2- groups in the ring may be replaced with -O-, and one or at least two single bonds in the ring may be replaced with a double bond; [ka] one or at least two -H in the ring may each independently be replaced by -CN, -F or -Cl, and one or at least two -CH= in the ring may each independently be replaced by -N=; X B represents -O-, -S- or -CO-; L B1 and L B2 each independently represents -H, -F, -Cl, -CF3, or -OCF3; Z B1 and Z B2 each independently represents a single bond, -O-, -CO-O-, -O-CO-, -CHO-, -OCH-, -CH=CH-, -C≡C-, -CHCH-, -CFCF-, -(CH)-, -CFO-, or -OCF-, n B1 and n B2 each independently represents 0, 1 or 2, n B1 If represents 2, [ka] may be the same or different, and n B2 If represents 2, [ka] may be the same or different, and Z B2 may be the same or different.

[0041] In some embodiments of the present invention, the compound of general formula B is [ka] and a combination of at least two of the compounds having the structure: In the formula, R B1 ' represents a halogen atom, -CF3, -OCF3, a linear alkyl group containing 1 to 8 (for example, which may be 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkyl group containing 3 to 8 (for example, which may be 3, 4, 5, 6, 7, or 8) carbon atoms, an alkoxy group containing 1 to 8 (for example, which may be 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or an alkenyl group containing 2 to 8 (for example, which may be 2, 3, 4, 5, 6, 7, or 8) carbon atoms, X B1 represents -O- or -CH2-, R B2 , X B and Z B1 has the same scope of protection as above.

[0042] In some embodiments of the present invention, the weight percentage of the compound of general formula B in the liquid crystal composition may be 0.1% to 20%, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 5%, 7%, 8%, 10%, 12%, 14%, 16%, 18%, or 20%.

[0043] In some embodiments of the present invention, in order to apply the liquid crystal composition of the present invention to a high-transmission liquid crystal display, the liquid crystal composition further comprises at least one compound represented by general formula A-1 and / or at least one compound represented by general formula A-2, [ka] In the formula, R A1 and R A2 are each independently a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] wherein the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms represents [ka] wherein one or at least two non-adjacent -CH2- groups may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and the linear alkyl group containing 1 to 12 carbon atoms, the branched alkyl group containing 3 to 12 carbon atoms, [ka] wherein one or at least two -H may each independently be replaced by -F or -Cl; [ka] are each independently, [ka] represents [ka] one or at least two -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; [ka] one or at least two -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring may each independently be replaced by -N=; Z A11 , Z A21 and Z A22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CHO- or -OCH2-, L A11 , L A12 , L A13 , L A21 and L A22 each independently represents -H, an alkyl group containing 1 to 3 (for example, 1, 2, or 3) carbon atoms, or a halogen atom; X A1 and X A2 each independently represent a halogen atom, a halogenated linear alkyl group having 1 to 5 (for example, which may be 1, 2, 3, 4, or 5) carbon atoms, a halogenated branched alkyl group having 3 to 5 (for example, which may be 3, 4, or 5) carbon atoms, a halogenated alkoxy group having 1 to 5 (for example, which may be 1, 2, 3, 4, or 5) carbon atoms, a halogenated alkenyl group having 2 to 5 (for example, which may be 2, 3, 4, or 5) carbon atoms, or a halogenated alkenyloxy group having 2 to 5 (for example, which may be 2, 3, 4, or 5) carbon atoms, nA11 represents 0, 1, 2 or 3, and n A11 If represents 2 or 3, [ka] may be the same or different, and Z A11 may be the same or different, n A12 represents 1 or 2, and n A12 If represents 2, [ka] may be the same or different, and n A2 represents 0, 1, 2 or 3, and n A2 If represents 2 or 3, [ka] may be the same or different, and Z A21 may be the same or different.

[0044] In some embodiments of the present invention, the compound of general formula A-1 is [ka] [ka] [ka] Any one or a combination of at least two of the compounds having the structure In the formula, R A1 is a linear alkyl group containing 1 to 8 (for example, it may be 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkyl group containing 3 to 8 (for example, it may be 3, 4, 5, 6, 7, or 8) carbon atoms, [ka] wherein one or at least two non-adjacent —CH2— groups in the linear alkyl group containing 1 to 8 carbon atoms or the branched alkyl group containing 3 to 8 carbon atoms may be each independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO-O— or —O-CO-; and [ka] one or at least two -H in each group may be independently replaced with -F or -Cl; R v and R w each independently represents -CH2- or -O-, v and w each independently represent 0 or 1; L A11 , L A12 , L A11 ', L A12 ', L A14 , L A15 and L A16 each independently represents -H or -F, L A13 and L A13 ' each independently represent -H or -CH3, and X A1 represents -F, -CF3 or -OCF3.

[0045] In some embodiments of the present invention, the weight percentage of the compound of general formula A-1 in the liquid crystal composition may be 0.1% to 50%, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50%.

[0046] In some embodiments of the present invention, the compound of general formula A-2 is [ka] [ka] Any one or a combination of at least two of the compounds having the structure In the formula, R A2 represents a linear alkyl group containing 1 to 8 (for example, 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched alkyl group containing 3 to 8 (for example, 3, 4, 5, 6, 7, or 8) carbon atoms, wherein one or at least two non-adjacent —CH— groups in the linear alkyl group containing 1 to 8 carbon atoms or branched alkyl group containing 3 to 8 carbon atoms are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —CO-O—, or —O-CO-, and one or at least two —H groups in the linear alkyl group containing 1 to 8 carbon atoms or branched alkyl group containing 3 to 8 carbon atoms are each independently optionally substituted with —F or —Cl, L A21 , L A22 , L A23 , L A24 and L A25 each independently represents -H or -F, X A2 represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0047] In some embodiments of the present invention, the weight percentage of the compound of general formula A-2 in the liquid crystal composition is 0.1% to 50%, and may be, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50%.

[0048] In some embodiments of the present invention, in the liquid crystal composition, the total weight percentage of the compound of general formula A-1 and the compound of general formula A-2 is 0.1% to 60%, and may be, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, or 60%, etc.

[0049] In some embodiments of the present invention, the liquid crystal composition further comprises at least one polymerizable compound of the general formula RM, [ka] In the formula, R P1 represents -H, a halogen atom, -CN, -Sp2-P2, a linear alkyl group containing 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (for example, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] and the linear alkyl group containing 1 to 12 carbon atoms, the branched alkyl group containing 3 to 12 carbon atoms, [ka] wherein one or at least two non-adjacent -CH2- groups may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-; and one or at least two -H groups may each independently be replaced by -F or -Cl; [ka] are each independently, [ka] represents [ka] one or at least two non-adjacent -CH2- groups in the ring may be replaced with -O-, and one or at least two single bonds in the ring may be replaced with a double bond; [ka] wherein one or at least two -H are each independently -F, -Cl, -CN, -Sp3-P3, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated straight-chain alkoxy group containing 1 to 11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, [ka] and one or at least two -CH= in the ring may each independently be replaced with -N=; [ka] are each independently, [ka] represents [ka] wherein one or at least two -H are each independently -F, -Cl, -CN, -Sp3-P3, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated straight-chain alkoxy group containing 1 to 11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, [ka] one or at least two -CH= in the ring may each independently be replaced by -N=; X0 represents -O-, -S-, -CO-, -CF2-, -NH-, or -NF-; P1, P2, and P3 each independently represent a polymerizable group. Sp1, Sp2, and Sp3 each independently represent a spacer group or a single bond; Z C1 and Z C2 are each independently -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CHO-, -OCHS-, -CHS-, -CFO-, -OCF-, -CFS-, -SCF-, -(CH) d -, -CF2CH2-, -CH2CF2-, -(CF2) d -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CHR 1 -, -CR 1 R 2 - or a single bond, R 1 and R 2 each independently represents a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, and d represents an integer of 1 to 4 (e.g., may be 1, 2, 3, or 4), and a represents 0, 1 or 2, b represents 0 or 1, and when a represents 2, [ka] may be the same or different, and Z C1 may be the same or different.

[0050] Polymerizable groups according to the present invention are groups adapted for polymerization reactions (e.g., radical or ionic polymerization, addition polymerization or condensation polymerization) or for addition or condensation in the polymer backbone. For chain polymerization, polymerizable groups containing -CH=CH- or -C≡C- are particularly preferred, and for ring-opening polymerization, for example, oxetanyl or epoxy groups are particularly preferred.

[0051] In some embodiments of the present invention, the polymerizable groups P1, P2, and P3 are each independently: [ka] or -SH, preferably [ka] or -SH, more preferably [ka] is.

[0052] The term "spacer group" is known to those skilled in the art and is described in the literature (for example, Pure Appl. Chem. 2001, 73(5), 888 and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368).

[0053] As used herein, the term "spacer group" refers to a flexible group that connects a mesogenic group and a polymerizable group in a polymerizable compound. Typical spacer groups include, for example, -(CH2)p1-, -(CH2CH2O)q1-CH2CH2-, -(CH2CH2S)q1-CH2CH2-, -(CH2CH2NH)q1-CH2CH2-, -CR 0 R 00 -(CH2)p1- or -(SiR 0 R 00 -O)p1-, where p1 represents an integer of 1 to 12, q1 represents an integer of 1 to 3, and R 0 and R 00each independently represents -H, a linear or branched alkyl group containing 1 to 12 carbon atoms, or a cyclic alkyl group containing 3 to 12 carbon atoms. In the present invention, the spacer group is preferably -(CH2)p1-, -(CH2)p1-O-, -(CH2)p1-O-CO-, -(CH2)p1-CO-O-, -(CH2)p1-O-CO-O-, or -CR 0 R 00 -(CH2)p1-.

[0054] In some embodiments of the present invention, the compound of the general formula RM is [ka] [ka] [ka] [ka] Any one or a combination of at least two of the compounds having the structure In the formula, X1~X 10 and X 12 are each independently -F, -Cl, -Sp3-P3, a linear alkyl group containing 1 to 5 (for example, which may be 1, 2, 3, 4, or 5) carbon atoms, an alkoxy group containing 1 to 5 (for example, which may be 1, 2, 3, 4, or 5) carbon atoms, [ka] Represents.

[0055] In some embodiments of the present invention, the weight percentage of the polymerizable compound of general formula RM in the liquid crystal composition is 0.001% to 5%, for example, 0.001%, 0.002%, 0.004%, 0.005%, 0.006%, 0.008%, 0.01%, 0.02%, 0.04%, 0.06%, 0.08%, 0.1%, 0.2%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.3%, 0.32%, 0.33%, 0.34%, 0.35%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.6%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.

[0056] In some embodiments of the present invention, the liquid crystal composition further comprises at least one additive.

[0057] The additives include nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, dopants, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, and light stabilizers.

[0058] In some embodiments of the present invention, the dopant is [ka] [ka] The compound may comprise any one or a combination of at least two of the following compounds:

[0059] In some embodiments of the present invention, the weight percentage of the dopant in the liquid crystal composition is 0% to 5%, and may be, for example, 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, and more preferably 0.01% to 1%.

[0060] In some embodiments of the present invention, the additives such as antioxidants, light stabilizers, UV absorbers, etc. are preferably [ka] [ka] [ka] It is a compound called In the formula, n represents a positive integer of 1 to 12, and may be, for example, 1, 2, 4, 6, 8, 9, 10, 11, or 12.

[0061] In some embodiments of the present invention, the antioxidant is [ka] The compound is any one or a combination of at least two selected from the following compounds:

[0062] In some embodiments of the present invention, the weight percentage of the light stabilizer in the liquid crystal composition is 0% to 5%, and may be, for example, 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, and more preferably 0.01% to 1%.

[0063] For ease of calculation, in the present invention, the sum of the weight percentages of compounds having different general formulas in the liquid crystal composition is 100%, and the content of additives is not included in the total content of the liquid crystal composition. That is, when additives are added, the total content of each component in the liquid crystal composition becomes >100%.

[0064] The liquid crystal composition containing the polymerizable compound of the present invention can be polymerized even in the absence of a polymerization initiator, but may contain a polymerization initiator to promote polymerization. Examples of the polymerization initiator include, but are not limited to, benzoin ethers, benzophenones, acetophenones, benzil ketals, and acylphosphine oxides.

[0065] In a second aspect, the present invention provides a liquid crystal display device, the liquid crystal display device comprising the liquid crystal composition according to the first aspect. [Effects of the Invention]

[0066] Compared with the prior art, the present invention has the following beneficial effects:

[0067] In the present invention, by designing the components of the liquid crystal composition, the liquid crystal composition produced has a K ave value is large, and ε ⊥ The film has high conductivity, small light scattering, suitable optical anisotropy and clearing point, and is suitable for VA, IPS or FFS type display devices. DETAILED DESCRIPTION OF THE INVENTION

[0068] In order to facilitate understanding of the present invention, examples of the present invention are listed below. Those skilled in the art should understand that the examples are only for understanding the present invention and should not be considered as specifically limiting the present invention.

[0069] The origins of some of the components in the examples and comparative examples are as follows.

[0070] For ease of explanation, in each of the following examples, the group structures of the liquid crystal compositions are represented by the codes shown in Table 1.

[0071] Table 1 [Table 1]

[0072] In Table 1, the dashed lines represent the attachment points of the groups.

[0073] Take the following structural formula as an example: [ka] When the structural formula is represented by the code shown in Table 1, it can be represented as nCCGF, where n in the code represents the number of C atoms in the alkyl group at the left end. For example, when n is "3", it represents that the alkyl group is -C3H7, C in the code represents cyclohexanyl, G represents a 2-fluoro-1,4-phenylene group, and F represents fluorine.

[0074] In the following Examples and Comparative Examples, the abbreviations for the performance measurement items are as shown in Table 2.

[0075] Table 2 Abbreviations for performance measurement items [Table 2] where Δn, n o , n e : Obtained by measuring at 20°C using an Abbe refractometer under a sodium lamp (589 nm) light source. Cp (°C): Measured using a quantitative method using a melting point measuring apparatus. ε ⊥ The measurement conditions were 20°C, 1 kHz, and a VA-type measurement cell with a cell thickness of 6 μm. K ave :K ave =(K 11 +K 22 +K 33 ) and K 11 , K. 22 and K. 33 was obtained by measuring and calculating the capacitance-voltage characteristic curve (CV curve) of the liquid crystal material using an LCR meter and a VA measurement cell, and the measurement conditions were: 6 μm VA measurement cell, V=0.1 to 20V.

number

[0076] Each component used in the liquid crystal compositions in the following examples can be synthesized by a known method or obtained commercially, and each component of the obtained liquid crystal composition conforms to the specifications of electronic compounds as a result of measurement.

[0077] The liquid crystal compositions in the following examples are prepared by blending components (the formula in parentheses at the end of each component in each example is the general formula to which the component belongs) and mixing them using conventional manufacturing methods, such as heating, ultrasonic waves, or suspension.

[0078] In this comparative example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0079] [Table 3] Comparative Example 2

[0080] In this comparative example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0081] [Table 4] [Example]

[0082] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0083] [Table 5]

[0084] As can be seen from the comparison between Example 1 and Comparative Examples 1 and 2, the liquid crystal composition of the present invention can have a suitable optical anisotropy, a suitable clearing point, a large ε ⊥ , large K ave values ​​and a small scattering coefficient (ratio reduced by 11% to 9%), resulting in a corresponding improvement in contrast of 11% to 9%. [Example]

[0085] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0086] [Table 6] [Example]

[0087] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0088] [Table 7] [Example]

[0089] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0090] [Table 8] [Example]

[0091] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0092] [Table 9] [Example]

[0093] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0094] [Table 10] [Example]

[0095] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0096] [Table 11] [Example]

[0097] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0098] [Table 12] [Example]

[0099] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0100] [Table 13] [Example]

[0101] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0102] [Table 14] [Example]

[0103] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0104] [Table 15] [Example]

[0105] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0106] [Table 16] [Example]

[0107] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance.

[0108] [Table 17]

[0109] As can be seen from the above, in the present invention, by designing the components of the liquid crystal composition, the liquid crystal composition produced has a Kave value is large, and ε ⊥ The liquid crystal display device containing the same has high transmittance and low light scattering (a ratio reduction of 9% to 48%), as well as suitable optical anisotropy and clearing point, and is therefore suitable for VA, IPS or FFS type display devices.

[0110] The applicant claims that the present invention has described the liquid crystal composition and liquid crystal display device of the present invention through the above examples, but the present invention is not limited to the above examples, i.e., it does not mean that the present invention cannot be implemented without relying on the above examples. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of each raw material of the product of the present invention, addition of auxiliary components, selection of specific methods, etc. are all within the protection scope and disclosure scope of the present invention. [Industrial Applicability]

[0111] The liquid crystal composition according to the present invention can be applied to the field of liquid crystals.

Claims

1. at least one compound of general formula I and at least one compound of general formula II, 【Chemistry 1】 In the formula, R １ is a halogenated or non-halogenated straight chain alkyl group containing 1 to 12 carbon atoms; a halogenated or non-halogenated branched chain alkyl group containing 3 to 12 carbon atoms; 【Chemistry 2】 and one or at least two non-adjacent —CH s in the halogenated or non-halogenated linear alkyl group containing 1 to 12 carbon atoms or the halogenated or non-halogenated branched alkyl group containing 3 to 12 carbon atoms. ２ each - group may independently be substituted by a -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- group; R １１ teeth, 【Transformation 3】 represents X １ represents —O— or —S—, n １１ represents 0, 1, 2, 3 or 4, 【Chemistry 4】 teeth, 【Transformation 5】 represents R ２ and R ３ are each independently a straight-chain alkyl group containing 1 to 12 carbon atoms, a branched-chain alkyl group containing 3 to 12 carbon atoms, 【Transformation 6】 and one or at least two non-adjacent —CH s in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms. ２ each - group may independently be substituted by a -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- group; 【Transformation 7】 teeth, 【Transformation 8】 represents the above 【Chemistry 9】 one or at least two of -CH ２ Each - may be independently replaced by -O-, and one or at least two single bonds in the ring may be independently replaced by a double bond; 【Chemistry 10】 one or at least two —H are each independently —F, —Cl, —CN, —CH ３ , or -OCH ３ one or at least two -CH= in the ring may each independently be replaced with -N=; L １ ~L ４ each independently represents a halogen atom, X ２ represents —O— or —S—, and X ３ is —O— or —CH ２ represents -, Z １ represents a single bond, —CO—O—, —O—CO—, —CH ２ O-, -OCH ２ -, -CH=CH-, -C≡C-, -CH ２ CH ２ -, -CF ２ CF ２ -, -(CH ２ ) ４ -, -CF ２ O- or -OCF ２ represents -, n １ represents 0, 1 or 2, n １ If represents 2, 【Chemistry 11】 may be the same or different, Z １ may be the same or different, and n ２ represents 1 or 2.

2. The compound of general formula I is 【Chemistry 12(1)】 【Chemistry 12(2)】 any one or a combination of at least two compounds having the structure wherein 【Chemistry 13】 X １ , X ２ , L １ , L ２ , Z １ and n １１ has the same scope of protection as claim 1, Preferably, the 【Chemistry 14】 teeth, 【Chemistry 15】 represents Preferably, the L １ , L ２ represent a fluorine atom, Preferably, the compound of general formula I is a compound of general formula I-1 or a compound of general formula I-9, The liquid crystal composition according to claim 1, wherein the weight percentage of the compound of general formula I in the liquid crystal composition is preferably 0.1% to 35%, more preferably 2% to 25%.

3. The compound of general formula II is 【Chemistry 16】 any one or a combination of at least two of the compounds Preferably, the L ３ , L ４ represent a fluorine atom, Preferably, the compound of general formula II includes a compound of general formula II-2 and / or a compound of general formula II-4, Preferably, the liquid crystal composition comprises at least two compounds of the general formula II, The liquid crystal composition according to claim 1 or 2, characterized in that the weight percentage of the compound of general formula II in the liquid crystal composition is preferably 0.1% to 60%, more preferably 8% to 60%.

4. The liquid crystal composition further comprises at least one compound of general formula N, 【Chemistry 17】 In the formula, R Ｎ１ and R Ｎ２ are each independently a straight-chain alkyl group containing 1 to 12 carbon atoms, a branched-chain alkyl group containing 3 to 12 carbon atoms, [Chemistry 18] and wherein one or two or more non-adjacent —CH groups in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms represent ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 19】 are each independently, 【Chemistry 20】 represents 【Chemistry 21】 One or at least two -CH ２ - may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; 【Chemistry 22】 one or at least two -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring may each independently be replaced by -N=; Z Ｎ１ and Z Ｎ２ each independently represents a single bond, —CO—O—, —O—CO—, —CH═CH—, —C≡C—, or —CF ２ CF ２ -, -(CH ２ ) ４ -, -CF ２ O- or -OCF ２ represents -, L Ｎ１ and L Ｎ２ each independently represents —H, an alkyl group containing 1 to 3 carbon atoms, or a halogen atom; and n Ｎ１ represents 0, 1, 2 or 3; n Ｎ２ represents 0 or 1, and 0≦n Ｎ１ +n Ｎ２ ≦3, and n Ｎ１ When represents 2 or 3, 【Chemistry 23】 may be the same or different, Z Ｎ１ 4. The liquid crystal composition according to claim 1, wherein may be the same or different.

5. The compound of general formula N is 【Chemistry 24(1)】 【Chemistry 24(2)】 【Chemistry 24(3)】 any one or a combination of at least two of the compounds having the structure Preferably, the compound of general formula N is 【Chemistry 25】 any one or a combination of at least two of the compounds having the structure The liquid crystal composition according to claim 4, wherein the weight percentage of the compound of general formula N in the liquid crystal composition is preferably 0.1% to 50%, more preferably 2% to 45%.

6. The liquid crystal composition further comprises at least one compound of general formula M, 【Chemistry 26】 In the formula, R Ｍ１ and R Ｍ２ are each independently a straight-chain alkyl group containing 1 to 12 carbon atoms, a branched-chain alkyl group containing 3 to 12 carbon atoms, 【Chemistry 27】 and one or at least two non-adjacent —CH ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 28】 are each independently, 【Chemistry 29】 represents 【Transformation 30】 One or at least two -CH ２ - may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; 【Chemistry 31】 wherein at most one —H may be replaced by a halogen atom; Z Ｍ１ and Z Ｍ２ each independently represents a single bond, —CO—O—, —O—CO—, or —CH ２ O-, -OCH ２ -, -C≡C-, -CH=CH-, -CH ２ CH ２ - or - (CH ２ ) ４ represents - and n Ｍ represents 0, 1 or 2, n Ｍ If represents 2, 【Chemistry 32】 may be the same or different, Z Ｍ２ 6. The liquid crystal composition according to claim 1, wherein may be the same or different.

7. The compound of general formula M is 【Chemistry 33(1)】 【Chemistry 33(2)】 【Chemistry 33(3)】 any one or a combination of at least two of the compounds having the structure Preferably, the compound of general formula M is 【Transformation 34】 any one or a combination of at least two of the compounds having the structure The liquid crystal composition according to claim 6, wherein the weight percentage of the compound of general formula M in the liquid crystal composition is preferably 0.1% to 60%, more preferably 30% to 50%.

8. 3. The liquid crystal composition according to claim 2, wherein the liquid crystal composition contains at least two compounds having the general formula I-1 and / or at least two compounds having the general formula I-9.

9. The compound of general formula II includes at least one compound selected from the group consisting of compounds of general formula II-1 and general formula II-3, and at least one compound selected from the group consisting of compounds of general formula II-2 and general formula II-4. The liquid crystal composition according to claim 3.

10. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 9.

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