Liquid crystal composition and liquid crystal display device using the same

Abstract

The present invention provides a liquid crystal composition and a liquid crystal display device using the same. The liquid crystal composition of the present invention comprises at least one compound of general formula P and at least one compound of general formula B. The liquid crystal composition of the present invention has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, a high K value (K 11 , K. 33 , K. ave ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time and large Flicker absolute value, so that a liquid crystal display device including it has good contrast, wide temperature use range, good transmittance, little flicker and good screen display effect, and when it is applied to a PSA type liquid crystal display mode, the liquid crystal composition has small roughness, good pretilt angle stability, small residue concentration and high VHR stability. [Formula 1] TIFF2025540834000164.tif37170

Description

[Technical Field]

[0001] The present invention relates to the field of liquid crystals, and in particular to a liquid crystal composition and a liquid crystal display device comprising said liquid crystal composition. [Background technology]

[0002] Liquid crystal displays (LCDs) have developed rapidly and are widely used in portable electronic information products due to their small size, light weight, low power consumption, and excellent display quality. According to the display mode, LCDs can be divided into PC (phase change), TN (twisted nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), FFS (fringe field switching), VA (vertical alignment), and PSA (polymer stable alignment).

[0003] A liquid crystal display element contains a liquid crystal composition having a nematic phase, and the liquid crystal composition has suitable properties. By improving the properties of the liquid crystal composition, an AM element with good properties can be obtained. The relationship between the liquid crystal composition and the properties of the AM element is summarized in Table A below. The properties of the liquid crystal composition will be further explained based on commercially available AM ​​elements. The temperature range of the nematic phase is related to the temperature range in which the element can be used. The viscosity of the liquid crystal composition is related to the response time of the element. In order to display moving images with the element, a short response time of the element is preferable.

[0004] Table A. Characteristics of liquid crystal composition and AM device No. Characteristics of liquid crystal composition Characteristics of AM element 1. Wide temperature range of nematic phase. Wide temperature range of use. 2 Low viscosity Short response time 3. Large optical anisotropy High contrast 4. Large absolute value of dielectric anisotropy Low threshold voltage, low power consumption, and high contrast 5. High resistivity High voltage holding ratio and high contrast 6. Stable against UV rays and heat. Long service life. 7 Large elastic constant High contrast, short response time, and fast response speed

[0005] In the application of LCD devices, the impact of contrast on visual effects is extremely important. Generally, the higher the contrast, the clearer and more striking the image, and the more vivid and beautiful the colors. Conversely, the lower the contrast, the more dim the overall screen. High contrast contributes greatly to image clarity, detail expression, and gradation expression. High-contrast products have advantages in black-and-white contrast, clarity, completeness, etc. Contrast also has a significant impact on the display effect of dynamic images. Because dynamic images change light and dark quickly, the higher the contrast, the easier it is for the human eye to distinguish this change process.

[0006] In order to improve the response speed of a liquid crystal display device, it is necessary to reduce the rotational viscosity of the liquid crystal material as much as possible. However, since a liquid crystal material with a low viscosity generally has a low clearing point and optical anisotropy, it is necessary to consider other performance requirements in addition to reducing the viscosity when preparing the components of the liquid crystal composition.

[0007] IPS mode transmittance formula T∝|Δε| / ε ⊥ (T represents the transmittance, "∝" represents the "inverse proportional" relationship, and ε ⊥Based on the above, it is possible to try to reduce the Δε of the liquid crystal medium to improve the transmittance of the liquid crystal, but the adjustment range of the driving voltage of the same product is generally limited. In addition, the liquid crystal molecules tilt in the Z-axis direction under the action of the vertical component of the fringe field, so that their optical anisotropy changes, and the following formula is obtained:

number

[0008] Meanwhile, based on measurements of the light leakage performance of conventional IPS-LCDs, it was discovered that the main causes of light leakage problems in LCD displays are light scattering (LC scattering), rubbing uniformity, light leakage from color filter films (CF / TFT scattering), and polarize ability, with light scattering accounting for 63% of the factors affecting light leakage performance.

[0009] The following relational expression

number

[0010] 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.

[0011] In view of the above situation, a general method for improving contrast and transmittance is to: (1) change the dielectric anisotropy Δε of the liquid crystal composition without changing ε ⊥ (2) the average elastic constant K of the liquid crystal composition can be increased. ave By increasing the value of ε, the degree of order of the liquid crystal molecules is increased, and light leakage is reduced, thereby improving the transmittance. However, the liquid crystal compositions provided by the prior art have a low ε ⊥ / Δε ratio is small, and K ave Therefore, how to provide a liquid crystal composition that can solve the above problems remains a technical problem that needs to be solved urgently in this field.

[0012] In the PSA-mode liquid crystal display mode, a small amount (e.g., 0.3 wt %, typically <1 wt %) of one or more polymerizable compounds is added to a liquid crystal composition. After the liquid crystal composition is filled into a liquid crystal cell, the liquid crystal molecules are polymerized (generally by UV photopolymerization) or crosslinked in situ with initial alignment, thereby firmly fixing the alignment of the liquid crystal molecules when a voltage is applied between the electrodes, or when no voltage is applied. With the continuous development of PSA-mode liquid crystal display elements, they have been applied to various conventional liquid crystal display devices, such as the well-known PSA-VA, PSA-OCB, PSA-IPS, PSA-FFS, and PSA-TN liquid crystal displays. In PSA-mode liquid crystal displays, a liquid crystal composition containing a polymerizable compound is positioned between two substrates, each of which has an electrode structure. Alternatively, two electrode structures are positioned on only one substrate, with polarizers attached to the outer surfaces of the substrates, each perpendicular to the other. Furthermore, either or both of the two substrates may include an alignment film attached to the substrate or the electrode structure (if any). PSA liquid crystal displays, like conventional liquid crystal displays, can be driven as active matrix displays or passive matrix displays. In active matrix displays, each pixel is driven by an integrated nonlinear active element (e.g., a transistor), while in passive matrix displays, each pixel is typically driven by multiplexing methods known in the art.

[0013] After the liquid crystal composition is filled into a display device, the polymerizable compound contained in the liquid crystal composition is generally polymerized or crosslinked in situ by UV photopolymerization, which is achieved by exposing the liquid crystal composition to UV radiation (preferably while simultaneously applying a voltage to the electrode structure). As a result of UV exposure, the polymerized or crosslinked polymerizable compound phase-separates from the other compounds in the liquid crystal composition and forms a polymer layer on the surface of the substrate, which forms a pretilt angle of the liquid crystal molecules relative to the substrate. For PSA-VA, PSA-OCB, PSA-FFS, and PSA-TN liquid crystal displays, polymerization of the polymerizable compound is preferably carried out with an applied voltage. For PSA-IPS displays, polymerization may be carried out with or without an applied voltage, preferably without an applied voltage.

[0014] Generally, in the manufacturing method of PSA type liquid crystal displays, UV photopolymerization is achieved through the following two steps.

[0015] In the first step (hereinafter referred to as the "UV1 step"), a pretilt angle is formed by exposing the liquid crystal composition to UV radiation (hereinafter referred to as "UV1 radiation") emitted from a radiation source and applying a voltage to the electrode structure. For a preferred polymerizable compound, a smaller pretilt angle should be formed in the same time or the same pretilt angle should be formed with a shorter UV1 exposure time (i.e., a faster pretilt angle formation rate) to improve production efficiency, shorten the tact time during mass production, and reduce costs. Furthermore, a faster pretilt angle formation rate of the polymerizable compound is advantageous for achieving complete polymerization of the polymerizable compound and reducing polymer residue. While using UV1 radiation with a shorter wavelength is preferred to increase the pretilt angle formation rate, using UV1 radiation with a longer wavelength is preferred to increase the voltage holding ratio (VHR). Therefore, it is generally difficult to achieve both a fast pretilt angle formation rate and a high voltage holding ratio.

[0016] In the second step (hereinafter referred to as the "UV2 step"), the liquid crystal composition is exposed to UV radiation (hereinafter referred to as "UV2 radiation") without applying a voltage to the electrode structure to ensure complete polymerization of the remaining polymerizable compound that was not polymerized in the UV1 step. To reduce the possibility of display unevenness in PSA-type liquid crystal displays due to the influence of non-uniformity in the UV process (non-uniformity in external conditions such as light, heat, and stress), it is desirable for the change in pretilt angle after the UV2 step to be as small as possible. At the same time, the UV irradiation intensity in the UV2 step should be reduced to avoid or reduce negative effects (e.g., reduced reliability or image burn-in).

[0017] Current PSA LCD production requires the application of a polyimide (PI) alignment layer (abbreviated as PI alignment layer) to a glass substrate to achieve vertical alignment of liquid crystal molecules. However, this method has obvious drawbacks (e.g., the PI application process is cumbersome, complicated, and time-consuming) and many other adverse effects, significantly limiting the quality of LCD displays. The PI alignment process significantly reduces production efficiency and increases production costs. Furthermore, the ability to precisely control the position of the PI printing area is limited. In addition, misalignment of the PI printing area can affect the sealing performance of the frame adhesive or the edge display effect of narrow-frame products, significantly limiting the development of currently mainstream narrow-frame products and significantly reducing their production yield. In conventional technologies, instead of using a PI alignment layer, self-alignment agents are typically added to the liquid crystal composition. However, not all liquid crystal compositions can be ideally combined with polymerizable compounds and self-alignment agents. For example, if the pretilt angle formation rate in the UV process is too slow, longer UV exposure time is required to form the desired pretilt angle, resulting in reduced production efficiency. If the polymer or self-aligning agent is UV-polymerized too quickly and with low diffusivity, runaway polymerization is likely to occur, resulting in increased roughness in the polymer layer and the formation of fine bright spots, which can affect the display performance of the panel. After the UV1 and UV2 steps, a large amount of polymerizable compound and self-aligning agent residue may remain, resulting in poor image sticking (IS) on the panel. Furthermore, if the compatibility between the liquid crystal composition and the polymerizable compound and self-aligning agent is insufficient, the polymerizable compound and self-aligning agent may precipitate during storage, resulting in a loss of liquid crystal performance. Furthermore, if the polymer network formed after polymerization of the polymerizable compound lacks rigidity, the structure of the polymer network may change when a PSA-type liquid crystal display device continuously displays the same pattern for a long period of time, which may further change the pretilt angle of the liquid crystal molecules and result in display defects.If the liquid crystal contact angle of the self-alignment agent is too high, the diffusion of the liquid crystal will be slow in the one-drop filling (ODF) process, and the concentration distribution of the self-alignment agent within the panel will be uneven, resulting in uneven alignment effects or poor alignment effects at the corners of the panel, causing display defects.

[0018] Furthermore, with the development of display technology, the LCD industry is facing increasingly stringent requirements for LCD display quality. This is especially true in the TV industry, where TV sizes are generally increasing and LCD generation lines are correspondingly becoming larger, significantly increasing the difficulty of the manufacturing process for large LCD panels. Therefore, ensuring display quality is an urgent issue that must be addressed. At the same time, in addition to the continuous optimization of panel manufacturing processes, the development of liquid crystal materials is also one solution. In particular, for PSA-type LCDs, the selection of liquid crystal compositions to be used in combination with polymerizable compounds has become a focus of research. Summary of the Invention [Problem to be solved by the invention]

[0019] In contrast to the drawbacks of the prior art, the present invention provides a polymer having good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, and a high K value (K 11 , K. 33 , K. ave ), a liquid crystal composition having a considerable rotational viscosity, a short response time, a high transmittance, a high contrast, a long low-temperature storage time, and a large absolute Flicker value, and when applied to a PSA type liquid crystal display mode, the liquid crystal composition has a small roughness, a good pretilt angle stability, a small concentration of residues, and a high VHR stability.

[0020] Furthermore, another object of the present invention is to provide a liquid crystal display device containing the above liquid crystal composition. [Means for solving the problem]

[0021] In order to achieve the above object of the invention, the present invention provides a liquid crystal composition, which comprises: at least one compound of general formula P; [ka] and at least one compound of general formula B, [ka] During the ceremony, R p1 , R p2 and R B1 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 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 replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O—, or —O—CO—; R B2 are -F, -Cl, -CF3, -OCF3, [ka] represents [ka] one or two or more non-adjacent —CH— groups may each independently be replaced by —O—, —S—, —CO—, —CO—O—, or —O—CO—; B1 represents -O- or -S, n B5 represents an integer from 0 to 5, [ka] are each independently, [ka] represents [ka] one or more -CH2- in the ring may each independently be replaced by -O- or -S-, and one or at most two single bonds in the ring may be replaced by a double bond; [ka] one or more -H in the ring may each independently be replaced by -CN, -F or -Cl, and one or more -CH= in the ring may each independently be replaced by -N=; [ka] teeth, [ka] represents [ka] one or more -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by a double bond; X B represents -O-, -S- or -CO-; L p1 and L p2 each independently represents a halogen; L B1 and L B2 each independently represents -H, -F, -Cl, -CF3, or -OCF3; Z B1 and Z B2 are each independently -CO-O-, -O-CO-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, or -(CH2)n B4 -, -(CH2)n B4 O-, -O(CH2)n B4 -, -(CH2)n B4S-, -S(CH2)n B4 represents -, -CF2O- or -OCF2-, n B4 represents an integer of 0 to 5 (e.g., 1, 2, 3, or 4), 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.

[0022] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula C: [ka] During the ceremony, R c1 and R c2 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 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 replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O—, or —O—CO—; [ka] teeth, [ka] represents [ka] one or more -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by a double bond; [ka] In the general formula C, one or more -H may be independently replaced by -F, -Cl or -CN, one or more -CH= in the ring may be replaced by -N=, and at least one [ka] teeth, [ka] represents Z c1 is -CO-O-, -O-CO-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)n B4 -, -(CH2)n B4 O-, -O(CH2)n B4 -, -(CH2)n B4 S-, -S(CH2)n B4 represents -, -CF2O- or -OCF2-, n B4 represents an integer from 0 to 5, n c1 represents 1, 2 or 3, and n c1 If =2 or 3, [ka] may be the same or different, and Z c1 may be the same or different.

[0023] In some embodiments of the present invention, the compound of general formula P is [ka] The compound is selected from the group consisting of:

[0024] In some embodiments of the present invention, a dielectric constant of a crystalline polymer having good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, a high K value (K 11 , K. 33 ), in order to obtain suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large absolute Flicker value, the compound of general formula P contains at least one (e.g., two or three) compounds of general formula P-1.

[0025] In some embodiments of the present invention, compounds of general formula P are p1 represents a linear alkenyl group containing 2 to 12 carbon atoms.

[0026] In some embodiments of the present invention, compounds of general formula P are p1 at least one compound of general formula P-1, wherein R represents a linear alkenyl group containing 2 to 12 carbon atoms; p1 represents a linear alkyl group containing 1 to 12 carbon atoms.

[0027] In the present invention, preferably, by adjusting the content of the compound of general formula P, the liquid crystal composition containing it has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, a high K value (K 11 , K. 33 ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large Flicker absolute value.

[0028] In some embodiments of the present invention, the weight percentage of the compound of general formula P in the liquid crystal composition is 0.1% to 30% (including any numerical value or subrange therein), for example, 0.1%, 1%, 3%, 4%, 6%, 8%, 10%, 12%, 13%, 14%, 15%, 16%, 18%, 20%, 21.5%, 22%, 24%, 26%, 28%, 30%, or a range between any two numerical values ​​therein.

[0029] In some embodiments of the present invention, the compound of general formula B is [ka] is selected from the group consisting of compounds X B2 represents -O-, -S- or -CH2-.

[0030] In some embodiments of the present invention, the optical anisotropy may be improved by a relatively high clearing point, a good absolute value of the dielectric anisotropy, a high K value (K 11 , K. 33 ), in order to obtain a suitable rotational viscosity, a short response time, a high transmittance, a high contrast, a long low-temperature storage time, and a large absolute Flicker value, the compound of general formula B contains at least one (e.g., two or three) compound of general formula B-5 and / or compound of general formula B-11.

[0031] In the present invention, preferably, by adjusting the content of the compound of general formula B, the liquid crystal composition containing it has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, and a high K value (K 11 , K. 33 ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large Flicker absolute value.

[0032] In some embodiments of the present invention, the weight percentage of the compound of general formula B in the liquid crystal composition is 0.1% to 30% (including any numerical value or subrange therein), for example, 0.1%, 1%, 4%, 6%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or a range between any two numerical values ​​therein.

[0033] In some embodiments of the present invention, compounds of general formula C are [ka] The compound is selected from the group consisting of:

[0034] In some embodiments of the present invention, the optical anisotropy may be improved by a relatively high clearing point, a good absolute value of the dielectric anisotropy, a high K value (K 11 , K. 33 ), in order to obtain suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large absolute Flicker value, the compound of general formula C is selected from the group consisting of compounds of general formula C-1, compounds of general formula C-4, compounds of general formula C-8, and compounds of general formula C-11.

[0035] In some embodiments of the present invention, the compounds of general formula C include at least one compound selected from the group consisting of compounds of general formula C-1, compounds of general formula C-4, and at least one compound selected from the group consisting of compounds of general formula C-8, compounds of general formula C-11.

[0036] In the present invention, preferably, by adjusting the content of the compound of general formula C, the liquid crystal composition containing it has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, a high K value (K 11 , K. 33 ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large Flicker absolute value.

[0037] In some embodiments of the present invention, the weight percentage of the compound of general formula C in the liquid crystal composition is 0.1% to 40% (including any numerical value or subrange therein), for example, 0.1%, 1%, 4%, 6%, 7%, 8%, 9%, 9.5%, 10%, 12%, 14%, 16%, 17%, 18%, 20%, 22%, 24%, 26%, 28%, 29%, 30%, 32%, 34%, 36%, 38%, 40%, or a range between any two numerical values ​​therein.

[0038] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound of general formula N, [ka] During the ceremony, R N1 and R N2 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 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 replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O—, or —O—CO—; [ka] are each independently, [ka] represents [ka] one or more -CH2- groups may be replaced by -O-; [ka] one or more -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or more -CH= in the ring may each independently be replaced by -N=; 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; Z N1 and Z N2 each independently represents a single bond, -CO-O-, -O-CO-, -CHO-, -OCH-, -CH=CH-, -C≡C-, -CHCH-, -CFCF-, -(CH)-, -CFO-, or -OCF-, 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 =2 or 3, [ka] may be the same or different, and Z N1 may be the same or different, n N1 represents 1, [ka] but [ka] If n N2 =0.

[0039] In some embodiments of the present invention, preferably, R N1 and R N2each independently represents a linear alkyl group containing 1 to 10 carbon atoms, a branched alkyl group containing 3 to 10 carbon atoms, a linear alkoxy group containing 1 to 9 carbon atoms, a branched alkoxy group containing 3 to 9 carbon atoms, a linear alkenyl group containing 2 to 10 carbon atoms, or a branched alkenyl group containing 2 to 10 carbon atoms, and more preferably R N1 and R N2 each independently represents a linear alkyl group containing 1 to 8 carbon atoms, a linear alkoxy group containing 1 to 7 carbon atoms, or a linear alkenyl group containing 2 to 8 carbon atoms.

[0040] In some embodiments of the present invention, compounds of general formula N are [ka] [ka] The compound is selected from the group consisting of:

[0041] In some embodiments of the present invention, the optical anisotropy may be improved by a relatively high clearing point, a good absolute value of the dielectric anisotropy, a high K value (K 11 , K. 33 ), in order to obtain an appropriate rotational viscosity, a short response time, a high transmittance, a high contrast, a long low-temperature storage time, and a large absolute Flicker value, the compound of general formula N is selected from the group consisting of compounds of general formula N-2, compounds of general formula N-7, compounds of general formula N-10, compounds of general formula N-12, compounds of general formula N-14, compounds of general formula N-18, compounds of general formula N-19, compounds of general formula N-22, compounds of general formula N-23, compounds of general formula N-26, and compounds of general formula N-27.

[0042] In some embodiments of the present invention, the liquid crystal composition of the present invention may comprise R N1 represents a straight-chain alkenyl group containing 2 to 8 carbon atoms.

[0043] In some embodiments of the present invention, preferably, by adjusting the content of the compound of general formula N, a liquid crystal composition containing it has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, a high K value (K 11 , K. 33 ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large Flicker absolute value.

[0044] 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 40% (including any numerical value or subrange therein), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 24.5%, 26%, 28%, 30%, 32%, 32.5%, 34%, 36%, 38%, 40%, or a range between any two numerical values ​​therein.

[0045] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula M, [ka] During the ceremony, RM1 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 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 replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O—, or —O—CO—; [ka] are each independently, [ka] represents [ka] one or more -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by a double bond; [ka] wherein at most one -H may be replaced by halogen; Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CHO-, -OCH-, -C≡C-, -CH=CH-, -CHCH- or -(CH)-; n M represents 0, 1 or 2, n M = 2, [ka] may be the same or different, and Z M2 may be the same or different.

[0046] In some embodiments of the present invention, preferably, R M1 and R M2 each independently represents a linear alkyl group containing 1 to 10 carbon atoms, a branched alkyl group containing 3 to 10 carbon atoms, a linear alkoxy group containing 1 to 9 carbon atoms, a branched alkoxy group containing 3 to 9 carbon atoms, a linear alkenyl group containing 2 to 10 carbon atoms, or a branched alkenyl group containing 4 to 10 carbon atoms, and more preferably R M1 and R M2 each independently represents a linear alkyl group containing 1 to 8 carbon atoms, a linear alkoxy group containing 1 to 7 carbon atoms, or a linear alkenyl group containing 2 to 8 carbon atoms.

[0047] In some embodiments of the present invention, preferably, R M1 and R M2 each independently represents a linear alkenyl group containing 2 to 8 carbon atoms, and more preferably, R M1 and R M2 each independently represents a linear alkenyl group containing 2 to 5 carbon atoms.

[0048] In some embodiments of the present invention, preferably, R M1 and R M2 One of them is a straight-chain alkenyl group containing 2 to 5 carbon atoms, and the other is a straight-chain alkyl group containing 1 to 5 carbon atoms.

[0049] In some embodiments of the present invention, preferably, R M1 and R M2 each independently represents a linear alkoxy group containing 1 to 8 carbon atoms, and more preferably, R M1 and R M2 each independently represents a linear alkoxy group containing 1 to 5 carbon atoms.

[0050] In some embodiments of the present invention, preferably, R M1 and R M2 One of them is a straight-chain alkoxy group containing 1 to 5 carbon atoms, and the other is a straight-chain alkyl group containing 1 to 5 carbon atoms.

[0051] In some embodiments of the present invention, when reliability is important, it is preferable to M1 and R M2 are all alkyl groups, and when it is important to reduce the volatility of the compound, it is preferable that R M1 and R M2 are both alkoxy groups, and when viscosity reduction is important, preferably, R M1 and R M2 At least one of the groups is an alkenyl group.

[0052] In some embodiments of the present invention, compounds of general formula M are [ka] [ka] The compound is selected from the group consisting of:

[0053] In some embodiments of the present invention, the optical anisotropy may be improved by a relatively high clearing point, a good absolute value of the dielectric anisotropy, a high K value (K 11 , K. 33 ), in order to obtain an appropriate rotational viscosity, a short response time, a high transmittance, a high contrast, a long low-temperature storage time, and a large absolute Flicker value, 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-14, compounds of general formula M-16, compounds of general formula M-19, compounds of general formula M-22, and compounds of general formula M-25.

[0054] In some embodiments of the present invention, compounds of general formula M are M2 represents a linear alkenyl group containing 2 to 5 carbon atoms, and preferably, the compound of general formula M-1 includes at least one (e.g., two or three) compound of general formula M-1, M2 represents a linear alkenyl group containing 2 to 5 carbon atoms.

[0055] In some embodiments of the present invention, preferably, by adjusting the content of the compound of general formula M, a liquid crystal composition containing it has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, a high K value (K 11 , K. 33 ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large Flicker absolute value.

[0056] 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 70% (including any numerical value or subrange therein), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 39.5%, 40%, 41%, 42%, 42.5%, 43.5%, 44%, 45%, 46%, 47%, 48%, 50%, 51.5%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, or a range between any two numerical values ​​therein.

[0057] In some embodiments of the present invention, in order to obtain low roughness, good pretilt angle stability, low residue concentration, and high VHR stability, the liquid crystal composition further comprises at least one polymerizable compound of the general formula RM, [ka] During the ceremony, R1 is -H, halogen, -CN, -Sp2-P2, 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., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] and represents a linear alkyl group containing 1 to 12 carbon atoms, a branched alkyl group containing 3 to 12 carbon atoms, [ka] in which one or two or more non-adjacent -CH2- groups may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-; and one or more -H groups may each independently be replaced by -F or -Cl; [ka] are each independently, [ka] represents [ka] one or more -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by a double bond; [ka] wherein one or more -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, 11, or 12) carbon atoms, [ka] and one or more -CH= in the ring may be replaced by -N=; [ka] teeth, [ka] represents [ka] wherein one or more -H are each independently -F, -Cl, -CN, -Sp3-P3, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 6 (e.g., 1, 2, 3, 4, 5, or 6) carbon atoms, a halogenated or non-halogenated straight-chain alkoxy group containing 1 to 5 (e.g., 1, 2, 3, 4, or 5) carbon atoms, [ka] and one or more -CH= in the ring may be replaced by -N=; P1, P2, and P3 each independently represent a polymerizable group. Sp1, Sp2, and Sp3 each independently represent a spacer group or a single bond; Z1 and Z2 each independently represent -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CHO-, -OCH-, -CHS-, -SCH-, -CFO-, -OCF-, -CFS-, -SCF-, or -(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., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, and d represents an integer of 1 to 4 (e.g., 1, 2, 3, or 4), a represents 0, 1 or 2, b represents 0 or 1, and when a represents 2, [ka] may be the same or different, and Z1 may be the same or different.

[0058] In some embodiments of the present invention, a polymerizable compound of the general formula RM is [ka] [ka] is selected from the group consisting of compounds During the ceremony, X1~X 10and X 12 are each independently -F, -Cl, -Sp3-P3, a linear alkyl group or an alkoxy group containing 1 to 5 carbon atoms, [ka] Represents.

[0059] In some embodiments of the present invention, X-X 10 and X 12 each independently represents -F, -Cl, -Sp3-P3, -CH3, -OCH3, -C2H5, or -OC2H5.

[0060] In some embodiments of the present invention, Sp1 and Sp2 both represent a single bond.

[0061] In some embodiments of the present invention, to obtain low roughness, good pretilt angle stability, low residue concentration, and high VHR stability, the polymerizable compound of general formula RM is selected from the group consisting of compounds of general formula RM-1 and compounds of general formula RM-2:

[0062] 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 reactions 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.

[0063] In some embodiments of the present invention, the polymerizable groups P1, P2, and P3 are each independently: [ka] or —SH, and preferably, the polymerizable groups P1, P2 and P3 each independently represent [ka] or —SH, and more preferably, the polymerizable groups P1, P2 and P3 each independently represent [ka] Represents.

[0064] In some embodiments of the present invention, the polymerizable compound of general formula RM-1 is [ka] The compound is selected from the group consisting of:

[0065] In some embodiments of the present invention, the polymerizable compound of general formula RM-13 is [ka] The compound is selected from the group consisting of:

[0066] As used herein, the term "spacer group" is known to those skilled in the art and described in the literature (e.g., Pure Appl. Chem. 2001, 73(5), 888 and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368). 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-, -(CH2) p1 -O-, -O-(CH2) p1 -, -(CH2) p1 -O-CO-, -(CH2) p1 -CO-O-, -(CH2) p1 -O-CO-O-, -(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 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12), q1 represents an integer of 1 to 3 (e.g., 1, 2, or 3), and R 0 and R 00 each independently represents -H, a straight-chain or branched-chain 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 cycloalkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. Particularly preferred spacer groups are -(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 -It is.

[0067] In some embodiments of the present invention, preferably, by adjusting the content of the compound of general formula RM, the liquid crystal composition of the present invention has small roughness, good pretilt angle stability, small residue concentration, and high VHR stability.

[0068] 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% (including any numerical value or subrange therein), 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%, 5%, or a range between any two of these numbers.

[0069] As used herein, -CO- and -C(O)- both represent a carbonyl group.

[0070] As used herein, the term "containing 1 to r carbon atoms" (where r is an integer greater than 1) may contain any integer between 1 and r (including the end values ​​1 and r) carbon atoms, such as containing 2 carbon atoms, containing (r-1) carbon atoms, or containing r carbon atoms. For example, "containing 1 to 12 carbon atoms" may contain 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms.

[0071] As used herein, the term "an integer between y1 and y2" may be any integer within this range, including the endpoints y1 and y2. For example, an "integer between 0 and 12" may be, for example, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12.

[0072] In some embodiments of the present invention, the liquid crystal composition further comprises at least one additive.

[0073] In addition to the above compounds, the liquid crystal composition of the present invention may contain a general nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, a dopant, an antioxidant, an ultraviolet absorber, an infrared absorber, a polymerizable monomer, or a light stabilizer.

[0074] Dopants that may be preferably added to the liquid crystal composition according to the present invention are shown below. [ka]

[0075] In some embodiments of the present invention, the weight percentage of the dopant in the liquid crystal composition is 0% to 5%, and preferably the weight percentage of the dopant in the liquid crystal composition is 0.01% to 1%.

[0076] The additives used in the liquid crystal composition of the present invention, such as antioxidants, light stabilizers, and ultraviolet absorbers, are preferably the following substances. [ka] [ka] [ka]

[0077] In the formula, n represents a positive integer of 1 to 12.

[0078] Preferably, the antioxidant is selected from the compounds listed below. [ka] In the formula, n represents a positive integer of 1 to 12.

[0079] In some embodiments of the present invention, the total weight percentage of the additives in the liquid crystal composition is 0% to 5%, and preferably the total weight percentage of the additives in the liquid crystal composition is 0.01% to 1%.

[0080] 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 benzoin ethers, benzophenones, acetophenones, benzil ketals, and acylphosphine oxides.

[0081] In another aspect, the present invention further provides a liquid crystal display device comprising the above liquid crystal composition.

[0082] In some embodiments of the present invention, the liquid crystal composition of the present invention is particularly suitable for VA, OCB, IPS, FFS, and TN type liquid crystal displays. [Effects of the Invention]

[0083] Compared with the prior art, the liquid crystal composition of the present invention has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, and a high K value (K 11 , K.33 ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time and large Flicker absolute value, so that a liquid crystal display device including it has good contrast, wide temperature use range, good transmittance, little flicker and good screen display effect, and when it is applied to a PSA type liquid crystal display mode, the liquid crystal composition has small roughness, good pretilt angle stability, small residue concentration and high VHR stability. DETAILED DESCRIPTION OF THE INVENTION

[0084] The present invention will be described below with reference to specific embodiments. Note that the following examples are illustrative of the present invention and are intended to explain the present invention only, not to limit the present invention. Other combinations and various improvements within the concept of the present invention can be made without departing from the spirit or scope of the present invention.

[0085] In the present invention, unless otherwise stated, all ratios used herein are by weight and all temperatures are in degrees Celsius.

[0086] For ease of explanation, in each of the following examples, the radical structure of each compound is represented by the code shown in Table 1. Table 1. Chemical structure codes [Table 1]

[0087] Take the following structural formula as an example: [ka]

[0088] When the structural formula is represented by the code shown in Table 1, it can be represented as nCCPF, 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", this represents that the alkyl group is -C3H7, and C in the code represents a 1,4-cyclohexylene group, P represents a 1,4-phenylene group, and F represents a fluorine substituent.

[0089] The abbreviations for the measurement items in the following examples are as follows. Cp Clearing point (nematic-isotropic phase transition temperature, °C) Δn Optical anisotropy (589nm, 20℃) Δε Dielectric constant anisotropy (1KHz, 20℃) ε ⊥ Perpendicular dielectric constant (1KHz, 20℃) Flicker value (dB, 20℃) K ave Average elastic constant (20℃) K 11 Splay elastic constant (20℃) K 33 Bend elastic constant (20℃) γ1 rotational viscosity (mPa·s, 20℃) RT Response time (ms, 20°C) Tr transmittance (%, 20℃) CR Contrast t -40℃ Low temperature storage time (h) Ra surface roughness (nm) PTA Pretilt Angle (°, 20°C) ΔPTA: Pretilt angle stability (change in pretilt angle after applying voltage for a certain period of time, °) Voltage retention rate (%) after applying VHR UV2 for 70 minutes During the ceremony, Cp: ​​Obtained by measurement using a melting point measurement apparatus.

[0090] Δn: Obtained by measurement at 20° C. using an Abbe refractometer under a sodium lamp (589 nm) light source.

[0091] Δε:Δε=εll -ε ⊥ and ε ll is the dielectric constant parallel to the molecular axis, and ε ⊥ is the dielectric constant in the direction perpendicular to the molecular axis, and the measurement conditions are 20°C, 1 kHz, and a VA-type measurement cell with a thickness of 6 μm.

[0092] γ1: Obtained by measurement using an LCM-2 type liquid crystal property evaluation system, and the measurement conditions are 20° C., 160 to 260 V, and a measurement cell with a thickness of 20 μm.

[0093] K 11 and K. 33 The CV curve of the liquid crystal was measured using an LCR meter and a VA measurement cell, and the results were calculated. The measurement conditions were a thickness of 6 μm, V=0.1 to 20 V, and a temperature of 20° C.

[0094] K ave :K ave =(K 11 +K 22 +K 33 ) / 3, and K 11 , K. 22 and K. 33 is obtained by measuring the CV curve of the liquid crystal using an LCR meter and a VA measurement cell, and then performing calculations. The measurement conditions are a measurement cell with a thickness of 6 μm, V=0.1 to 20 V, and temperature of 20° C.

[0095] The VT curve of the light-control device was measured using a Tr:DMS 505 photoelectric integrated measuring instrument. The maximum transmittance value in the VT curve was taken as the transmittance of the liquid crystal. The measurement cell was a negative IPS type with a thickness of 3.5 μm.

[0096] The measurement was performed using a RT:DMS 505 photoelectric integrated measurement device under the following conditions: 20° C., V100 drive, negative IPS type, 3.5 μm thick measurement cell.

[0097] The measurement was performed using a Flicker:DMS 505 measurement device, and the measurement conditions were 20°C, 40Hz, L127 voltage drive, and a 3.5µm thick negative FFS type measurement cell.

[0098] Using a CR:DMS 505 measuring device, the transmittance of the liquid crystal cell was measured at 255 grayscale voltage and 0 grayscale voltage, respectively, i.e., T r255 and T r0 Measure T r255 / T r0 is obtained from

[0099] t -40℃ The time when crystal precipitation was observed after placing a nematic liquid crystal medium in a 7 μm antiparallel cell and storing it at −40° C. was recorded.

[0100] Ra: A liquid crystal composition containing a polymerizable compound is polymerized by irradiating it with UV2 light for 70 minutes, and then the liquid crystal molecules are washed away. This is the surface roughness of the polymer layer after polymerization, measured with an atomic force microscope (AFM).

[0101] PTA: Using the crystal rotation method, liquid crystal is injected into a VA-type measurement cell (3.5 μm thick), and a voltage (15 V, 60 Hz) is applied while ultraviolet light UV1 is irradiated, polymerizing the polymerizable compound to form a pretilt angle PTA1. The liquid crystal composition with the pretilt angle PTA1 is then continuously irradiated with ultraviolet light UV2 to remove any remaining polymerizable compound in the PTA1 state. The pretilt angle formed in the polymerizable compound at this stage is PTA2. The present invention considers the polymerization rate of a polymerizable compound by comparing the magnitude of the pretilt angle formed when irradiating UV1 for the same period of time (the smaller the pretilt angle, the faster the polymerization rate) or the time required to form the same pretilt angle (the shorter the required time, the faster the polymerization rate).

[0102] ΔPTA: Pretilt angle. The measurement cell used for measuring PTA was subjected to UV1 and UV2 steps to form a pretilt angle of 88±0.2°. Then, a 60Hz SW wave, 20V AC voltage, and 2V DC voltage were applied to the measurement cell. After a certain period of time (168 hours) in a backlight environment at 40°C, the pretilt angle of the measurement cell was measured, and ΔPTA was calculated. (168h) =PTA (初期) -PTA (168h) and ΔPTA(168h) The smaller the value, the higher the stability of the pretilt angle.

[0103] Residual concentration: After irradiating with UV2 for 70 minutes, the liquid crystal eluted from the liquid crystal measurement cell is detected by high performance liquid chromatography (HPLC), and the concentration of the polymerizable compound therein is called the residual concentration (ppm).

[0104] VHR:UV2(0.25mW / cm -2 After applying a 313 nm (313 nm) for 70 minutes, the measurement was carried out using a TOY06254 liquid crystal physical property evaluation system, and the measurement conditions were 60° C., 1 V, 0.6 Hz, and a VA type measurement cell with a thickness of 9 μm.

[0105] The components used in the following examples can be synthesized by known methods or obtained commercially. These synthesis techniques are common, and the resulting liquid crystal compounds meet the standards for electronic compounds.

[0106] Liquid crystal compositions are prepared according to the blending ratios of the liquid crystal compositions specified in the following examples, using methods commonly used in the art, such as heating, ultrasonic waves, suspension, etc., by mixing the liquid crystal compositions according to the blending ratios.

[0107] Comparative Example 1 According to each compound and its weight percentage shown in Table 2, a liquid crystal composition of Comparative Example 1 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0108] Table 2. Liquid crystal composition components and performance parameter measurement results [Table 2]

[0109] Example 1 According to each compound and its weight percentage shown in Table 3, the liquid crystal composition of Example 1 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure the performance.

[0110] Table 3. Liquid crystal composition components and performance parameter measurement results [Table 3]

[0111] As can be seen from the comparison between Example 1 and Comparative Example 1, the liquid crystal composition of the present invention uses a combination of the compounds of general formula B, general formula P, and general formula C of the present invention, and thereby the liquid crystal composition of the present invention has good optical anisotropy, a fairly high clearing point, a good absolute value of dielectric anisotropy, a high K value (K 11 , K. 33 ), has suitable rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and large Flicker absolute value.

[0112] Example 2 According to each compound and its weight percentage shown in Table 4, the liquid crystal composition of Example 2 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure the performance.

[0113] Table 4. Liquid crystal composition components and performance parameter measurement results [Table 4]

[0114] Example 3 According to each compound and its weight percentage shown in Table 5, the liquid crystal composition of Example 3 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure the performance.

[0115] Table 5. Liquid crystal composition components and performance parameter measurement results [Table 5]

[0116] Example 4 According to each compound and its weight percentage shown in Table 6, the liquid crystal composition of Example 4 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure the performance.

[0117] Table 6. Liquid crystal composition components and performance parameter measurement results [Table 6]

[0118] Example 5 According to each compound and its weight percentage shown in Table 7, the liquid crystal composition of Example 5 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure the performance.

[0119] Table 7. Liquid crystal composition components and performance parameter measurement results [Table 7]

[0120] Example 6 According to each compound and its weight percentage shown in Table 8, the liquid crystal composition of Example 6 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure the performance.

[0121] Table 8. Liquid crystal composition components and performance parameter measurement results [Table 8]

[0122] Example 7 The liquid crystal composition of Example 7 is prepared according to the compounds and their weight percentages shown in Table 9, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0123] Table 9. Liquid crystal composition components and performance parameter measurement results [Table 9]

[0124] Example 8 The liquid crystal composition of Example 8 is prepared according to the compounds and their weight percentages shown in Table 10, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0125] Table 10. Liquid crystal composition components and performance parameter measurement results [Table 10]

[0126] Example 9 The liquid crystal composition of Example 9 is prepared according to the compounds and their weight percentages shown in Table 11, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0127] Table 11. Liquid crystal composition components and performance parameter measurement results [Table 11]

[0128] Example 10 The liquid crystal composition of Example 10 is prepared according to the compounds and their weight percentages shown in Table 12, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0129] Table 12. Liquid crystal composition components and performance parameter measurement results [Table 12]

[0130] The structures of the polymerizable compounds used in the following examples are shown in Table 13 below.

[0131] Table 13. Polymerizable compounds used in the examples [Table 13]

[0132] The structures of the additives used in each of the following examples are shown in Table 14 below.

[0133] Table 14. Additives used in the examples [Table 14]

[0134] According to each compound and its weight percentage shown in Table 15, host liquid crystal compositions DH1, H3 and H4 are prepared, and the liquid crystal compositions are filled between two substrates of a liquid crystal display to measure the performance.

[0135] Table 15. Host liquid crystal composition components and performance parameter measurement results [Table 15]

[0136] According to the compounds and their weight percentages shown in Table 16, host liquid crystal compositions DH3, DH4, H5, H6, H7, H8, H9 and H10 are prepared, and the liquid crystal compositions are filled between two substrates of a liquid crystal display to measure the performance.

[0137] Table 16. Host liquid crystal composition components and performance parameter measurement results [Table 16]

[0138] Comparative Examples 2 and 3 and Examples 11 and 12 The liquid crystal compositions of Comparative Example 2, Comparative Example 4, and Examples 11 and 12 were prepared using the weight parts of each component listed in Table 17, and the physical properties of the resulting liquid crystal compositions were almost unchanged relative to the respective host liquid crystal compositions. Each of the resulting liquid crystal compositions was filled into a measurement cell and performance measurements were performed. The relevant performance measurement results for the liquid crystal compositions of Comparative Examples 2 and 3 and Examples 11 and 12 are shown in Table 17 below.

[0139] Table 17. Liquid crystal composition components and performance parameter measurement results [Table 17]

[0140] As can be seen from the comparison between Examples 11 and 12 and Comparative Examples 2 and 3, by using a compound of general formula P of the present invention, a compound of general formula B, and a polymerizable compound of general formula RM in combination, the liquid crystal composition of the present invention has a suitable clearing point, a suitable optical anisotropy, a suitable absolute value of dielectric anisotropy, a suitable K value (K 11 , K. 33 ), has suitable rotational viscosity, low roughness, good pretilt angle stability, low residue concentration and high VHR stability.

[0141] Comparative Examples 4 to 6 and Examples 13 to 18 The liquid crystal compositions of Comparative Examples 4 to 6 and Examples 13 to 18 were prepared using the weight parts of each component listed in Table 18, and the physical properties of the resulting liquid crystal compositions were almost unchanged relative to the respective host liquid crystal compositions. Each of the resulting liquid crystal compositions was filled into a measurement cell and performance measurements were performed. The relevant performance measurement results for the liquid crystal compositions of Comparative Examples 4 to 6 and Examples 13 to 18 are shown in Table 18 below.

[0142] Table 18. Liquid crystal composition components and performance parameter measurement results [Table 18]

[0143] As can be seen from the comparison between Examples 13 to 18 and Comparative Examples 4 to 6, by using a compound of general formula P of the present invention, a compound of general formula B, and a polymerizable compound of general formula RM in combination, the liquid crystal composition of the present invention has a suitable clearing point, a suitable optical anisotropy, a suitable absolute value of dielectric anisotropy, a suitable K value (K 11 , K. 33 ), suitable rotational viscosity, small roughness, good pretilt angle stability, small residual concentration, and high VHR stability. As can be seen from the comparison between Example 16 and Comparative Example 6, by using a compound of general formula P, a compound of general formula B, a polymerizable compound of general formula RM, a compound of general formula N-23, and / or a compound of general formula N-22 in combination, the liquid crystal composition of the present invention has smaller roughness, better pretilt angle stability, smaller residual concentration, and high VHR stability.

[0144] Comparative Examples 7 to 9 and Examples 19 to 24 The liquid crystal compositions of Comparative Examples 7 to 9 and Examples 19 to 24 were prepared using the weight parts of each component listed in Table 19, and the physical properties of the resulting liquid crystal compositions were almost unchanged relative to the respective host liquid crystal compositions. Each of the resulting liquid crystal compositions was filled into a measurement cell and performance measurements were performed. The relevant performance measurement results for the liquid crystal compositions of Comparative Examples 7 to 9 and Examples 19 to 24 are shown in Table 19 below.

[0145] Table 19. Liquid crystal composition components and performance parameter measurement results [Table 19]

[0146] As can be seen from the comparison between Examples 19 to 24 and Comparative Examples 7 to 9, by using a compound of general formula P of the present invention, a compound of general formula B, and a polymerizable compound of general formula RM in combination, the liquid crystal composition of the present invention has a suitable clearing point, a suitable optical anisotropy, a suitable absolute value of dielectric anisotropy, a suitable K value (K 11 , K. 33 ), has suitable rotational viscosity, low roughness, good pretilt angle stability, low residue concentration and high VHR stability.

[0147] Comparative Example 10 According to each compound and its weight percentage shown in Table 20, a liquid crystal composition of Comparative Example 10 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0148] Table 20. Liquid crystal composition components and performance parameter measurement results [Table 20]

[0149] Example 25 The liquid crystal composition of Example 25 is prepared according to the compounds and their weight percentages shown in Table 21, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0150] Table 21. Liquid crystal composition components and performance parameter measurement results [Table 21]

[0151] Comparative Example 11 According to each compound and its weight percentage shown in Table 22, a liquid crystal composition of Comparative Example 11 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0152] Table 22. Liquid crystal composition components and performance parameter measurement results [Table 22]

[0153] Example 26 The liquid crystal composition of Example 26 is prepared according to the compounds and their weight percentages shown in Table 23, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0154] Table 23. Liquid crystal composition components and performance parameter measurement results [Table 23]

[0155] Example 27 The liquid crystal composition of Example 27 is prepared according to the compounds and their weight percentages shown in Table 24, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0156] Table 24. Liquid crystal composition components and performance parameter measurement results [Table 24]

[0157] Example 28 According to each compound and its weight percentage shown in Table 25, the liquid crystal composition of Example 28 is prepared, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0158] Table 25. Liquid crystal composition components and performance parameter measurement results [Table 25]

[0159] Example 29 The liquid crystal composition of Example 29 is prepared according to the compounds and their weight percentages shown in Table 26, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0160] Table 26. Liquid crystal composition components and performance parameter measurement results [Table 26]

[0161] Example 30 The liquid crystal composition of Example 30 is prepared according to the compounds and their weight percentages shown in Table 27, and the liquid crystal composition is filled between two substrates of a liquid crystal display to measure its performance.

[0162] Table 27. Liquid crystal composition components and performance parameter measurement results [Table 27]

[0163] As can be seen from Examples 25 to 30 and Comparative Examples 10 to 11, the liquid crystal compositions of the present invention have good optical anisotropy, a high clearing point, and a high K ave The Flicker absolute value is large, so that the liquid crystal display device including it has good contrast, little flicker, and good screen display effect.

[0164] The above embodiments are merely intended to explain the technical ideas and features of the present invention so that those skilled in the art can understand and practice the contents of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the gist of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquid crystal composition, at least one compound of general formula P; 【Chemistry 1】 and at least one compound of general formula B, 【Chemistry 2】 During the ceremony, R ｐ１ , R ｐ２ and R Ｂ１ 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 3】 and one or two or more non-adjacent —CH 3 in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms. ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; R Ｂ２ is -F, -Cl, -CF ３ , -OCF ３ , 【Chemistry 4】 represents 【Transformation 5】 One or more non-adjacent —CH ２ - may be independently replaced by -O-, -S-, -CO-, -CO-O- or -O-CO-; Ｂ１ represents —O— or —S, n Ｂ５ represents an integer from 0 to 5, 【Transformation 6】 are each independently, 【Transformation 7】 represents 【Transformation 8】 One or more —CH ２ - may be independently replaced by -O- or -S-, and one or at most two single bonds in the ring may be replaced by a double bond; 【Chemistry 9】 one or more -H in the ring may each independently be replaced by -CN, -F or -Cl, and one or more -CH= in the ring may each independently be replaced by -N=; 【Chemistry 10】 teeth, 【Chemistry 11】 represents 【Chemistry 12】 One or more —CH ２ - may be replaced by -O-, one or at most two single bonds in the ring may be replaced by a double bond; X Ｂ represents —O—, —S—, or —CO—; L ｐ１ and L ｐ２ each independently represents a halogen; L Ｂ１ and L Ｂ２ are each independently —H, —F, —Cl, or —CF ３ or -OCF ３ represents Z Ｂ１ and Z Ｂ２ each independently represents —CO—O—, —O—CO—, or —OCH ２ -, -CH=CH-, -C≡C-, -CH ２ CH ２ -, -CF ２ CF ２ -, -(CH ２ ) n Ｂ４ -, -(CH ２ ) n Ｂ４ O-, -O(CH ２ ) n Ｂ４ -, -(CH ２ ) n Ｂ４ S-, -S(CH ２ ) n Ｂ４ -, -CF ２ O- or -OCF ２ represents -, n Ｂ４ represents an integer from 0 to 5, n Ｂ１ and n Ｂ２ each independently represents 0, 1 or 2; n Ｂ１ If represents 2, 【Chemistry 13】 may be the same or different, and n Ｂ２ If represents 2, 【Chemistry 14】 may be the same or different.

2. The liquid crystal composition further comprises at least one compound represented by general formula C, 【Chemistry 15】 During the ceremony, R ｃ１ and R ｃ２ 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 16】 and one or two or more non-adjacent —CH 3 in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms. ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 17】 teeth, [Chemistry 18] represents 【Chemistry 19】 One or more —CH ２ - may be replaced by -O-, one or at most two single bonds in the ring may be replaced by a double bond; 【Chemistry 20】 In the general formula C, one or more -H may be independently replaced by -F, -Cl or -CN, and one or more -CH= in the ring may be replaced by -N=. 【Chemistry 21】 teeth, 【Chemistry 22】 represents Z ｃ１ is -CO-O-, -O-CO-, -OCH ２ -, -CH=CH-, -C≡C-, -CH ２ CH ２ -, -CF ２ CF ２ -, -(CH ２ ) n Ｂ４ -, -(CH ２ ) n Ｂ４ O-, -O(CH ２ ) n Ｂ４ -, -(CH ２ ) n Ｂ４ S-, -S(CH ２ ) n Ｂ４ -, -CF ２ O- or -OCF ２ represents -, n Ｂ４ represents an integer from 0 to 5, n ｃ１ represents 1, 2 or 3, and n ｃ１ If = 2 or 3, 【Chemistry 23】 may be the same or different, Z ｃ１ The liquid crystal composition according to claim 1, wherein may be the same or different.

3. The compound of general formula P is 【Chemistry 24】 is selected from the group consisting of compounds The compound of the general formula B is 【Chemistry 25】 is selected from the group consisting of compounds Compounds of general formula C are 【Chemistry 26】 is selected from the group consisting of compounds During the ceremony, X Ｂ２ is —O—, —S— or —CH ２ 3. The liquid crystal composition according to claim 2, wherein:

4. The liquid crystal composition according to claim 2, wherein the weight percentage of the compound of general formula P in the liquid crystal composition is 0.1% to 30%, the weight percentage of the compound of general formula B in the liquid crystal composition is 0.1% to 30%, and the weight percentage of the compound of general formula C in the liquid crystal composition is 0.1% to 40%.

5. The liquid crystal composition further comprises at least one compound represented by general formula N, 【Chemistry 27】 During the ceremony, 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 28】 and one or two or more non-adjacent —CH 3 in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms. ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 29】 are each independently, 【Transformation 30】 represents 【Chemistry 31】 One or more —CH ２ - may be replaced by -O-, 【Chemistry 32】 one or more -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or more -CH= in the ring may each independently be replaced by -N=; L Ｎ１ and L Ｎ２ each independently represents —H, an alkyl group containing 1 to 3 carbon atoms, or a halogen; Z Ｎ１ and Z Ｎ２ each independently represents a single bond, —CO—O—, —O—CO—, or —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 Ｎ１ represents 0, 1, 2 or 3; n Ｎ２ represents 0 or 1, and 0≦n Ｎ１ +n Ｎ２ ≦3, and n Ｎ１ If = 2 or 3, 【Transformation 33】 may be the same or different, Z Ｎ１ may be the same or different, n Ｎ１ represents 1, 【Transformation 34】 but 【Chemistry 35】 When representing Ｎ２ 2. The liquid crystal composition according to claim 1, wherein:

6. The compound of general formula N is 【Chemistry 36(1)】 【Chemistry 36(2)】 【Chemistry 36(3)】 6. The liquid crystal composition according to claim 5, wherein the compound is selected from the group consisting of the compounds:

7. The liquid crystal composition further comprises at least one compound represented by general formula M, 【Chemistry 37】 During the ceremony, RM １ 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, 【Transformation 38】 and one or two or more non-adjacent —CH 3 in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms. ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 39】 are each independently, 【Chemistry 40】 represents 【Chemistry 41】 One or more —CH ２ - may be replaced by -O-, one or at most two single bonds in the ring may be replaced by a double bond; 【Chemistry 42】 wherein at most one —H may be replaced by halogen; 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 -, n Ｍ represents 0, 1 or 2, n Ｍ = 2, 【Chemistry 43】 may be the same or different, Z Ｍ２ The liquid crystal composition according to claim 5, wherein may be the same or different.

8. The compound of general formula M is 【Chemistry 44(1)】 【Chemistry 44(2)】 8. The liquid crystal composition according to claim 7, wherein the compound is selected from the group consisting of:

9. The liquid crystal composition according to claim 3, wherein the compound of general formula P includes at least one compound of general formula P-1, the compound of general formula B includes at least one compound of general formula B-5 and / or compound of general formula B-11, and the compound of general formula C is selected from the group consisting of compounds of general formula C-1, compounds of general formula C-4, compounds of general formula C-8, and compounds of general formula C-11.

10. The liquid crystal composition according to claim 7, wherein the weight percentage of the compound of general formula N in the liquid crystal composition is 0.1% to 40%, and the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1% to 70%.

11. The liquid crystal composition comprises at least one polymerizable compound of general formula RM, 【Chemistry 45】 During the ceremony, R １ -H, halogen, -CN, -Sp ２ -P ２ , a straight chain alkyl group containing 1 to 12 carbon atoms, a branched chain alkyl group containing 3 to 12 carbon atoms, 【Chemistry 46】 wherein the linear alkyl group containing 1 to 12 carbon atoms, the branched alkyl group containing 3 to 12 carbon atoms, 【Chemistry 47】 One or more non-adjacent —CH ２ - may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; one or more -H may each independently be replaced by -F or -Cl; 【Chemistry 48】 are each independently, 【Chemistry 49】 represents [Transformation 50] One or more —CH ２ - may be replaced by -O-, one or at most two single bonds in the ring may be replaced by a double bond; 【Chemistry 51】 One or more —H in each group are independently —F, —Cl, —CN, or —Sp. ３ -P ３ , a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 carbon atoms, a halogenated or non-halogenated straight-chain alkoxy group containing 1 to 11 carbon atoms, 【Chemistry 52】 and one or more -CH= in the ring may be replaced by -N=; 【Chemistry 53】 teeth, 【Chemistry 54】 represents 【Transformation 55】 One or more —H in each group are independently —F, —Cl, —CN, or —Sp. ３ -P ３ , a halogenated or non-halogenated straight-chain alkyl group containing 1 to 6 carbon atoms, a halogenated or non-halogenated straight-chain alkoxy group containing 1 to 5 carbon atoms, 【Transformation 56】 and one or more -CH= in the ring may be replaced by -N=; P １ , P ２ and P ３ each independently represents a polymerizable group, Sp １ , Sp ２ and Sp ３ each independently represents a spacer group or a single bond, Z １ and Z ２ each independently represents -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, or -CH ２ O-, -OCH ２ -, -CH ２ S-, -SCH ２ -, -CF ２ O-, -OCF ２ -, -CF ２ S-, -SCF ２ -, -(CH ２ ) ｄ -, -CF ２ CH ２ -, -CH ２ CF ２ -, - (CF ２ ) ｄ -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH ２ CH ２ -CO-O-, -O-CO-CH ２ CH ２ --, --CHR １ -, -CR １ R ２ represents - or a single bond, R １ and R ２ each independently represents a linear alkyl group containing 1 to 12 carbon atoms, and d represents an integer of 1 to 4; a represents 0, 1 or 2, b represents 0 or 1, and when a represents 2, 【Chemistry 57】 may be the same or different, Z １ The liquid crystal composition according to claim 1, wherein may be the same or different.

12. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 11.

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