Ferroelectric liquid crystal composition and liquid crystal display device

Abstract

The application discloses a ferroelectric liquid crystal composition, which comprises a first component and a second component, wherein the first component comprises one or more compounds of general formula I, and the second component comprises one or more compounds of general formula II. The ferroelectric liquid crystal composition has the advantages of high transmittance, large contrast, large phase transition range, small pitch and high spontaneous polarization intensity. The application further provides a display device comprising the ferroelectric liquid crystal composition.

Description

Technical Field

[0001] This invention relates to the field of ferroelectric liquid crystal displays, and more specifically to liquid crystal compositions and liquid crystal display devices comprising compounds containing chiral groups. Background Technology

[0002] Nematic liquid crystals (LCS) are widely used in the display field due to their inherent advantages, such as in LCD TVs and computer monitors. However, as people's living standards continue to improve, LCS are becoming increasingly limited in applications requiring rapid response. For example, they cannot meet the demands of high-definition, high-resolution displays and large-capacity dynamic displays. In dynamic image displays, fast-moving images exhibit phenomena such as "trailing" and "ghosting," resulting in poor dynamic image display quality and severely impacting overall display quality. Therefore, developing liquid crystal devices with fast response speeds has become a top priority for liquid crystal researchers. Among the various liquid crystal phases, ferroelectric liquid crystals are the most noteworthy, but they have not yet reached the stage of industrial production. Ferroelectric liquid crystals possess advantages such as fast response speeds (tens to hundreds of microseconds, or even faster), low driving voltage, wide viewing angles, suitability for high-resolution displays, and photoelectric effects, nonlinear optical effects, and photorefractive effects, making them a promising liquid crystal material.

[0003] Ferroelectric liquid crystals were discovered in 1975. Meyer, considering symmetry, predicted that the smectic C phase, composed of chiral molecules, possessed ferroelectric properties. Meyer, in collaboration with Keller and others, synthesized the first ferroelectric liquid crystal material, directly proving the existence of ferroelectricity in liquid crystals, thus pioneering research into novel liquid crystal materials and devices. In 1980, Clark and Lagerwall proposed that placing ferroelectric liquid crystals between two glass substrates with a very small gap (less than 2 μm) results in a bistable molecular orientation, known as surface-stabilized ferroelectric liquid crystal (SSFLC).

[0004] The discovery of SSFLC propelled the research of ferroelectric liquid crystals into a new stage. Utilizing the bistable properties and fast response of SSFLC, optical switch arrays and spatial light modulators can be fabricated for multiplexing in fiber optic communication. Its birefringence and electrical tunability can be used to create tunable wavelength optical filters for wavelength division multiplexing in fiber optic communication; it can also be used to fabricate all-optical fiber polarizers. In 1988, Canon of Japan introduced the first surface-stabilized ferroelectric liquid crystal display (SSFLCD). With its fast response, low driving voltage, wide viewing angle, and high resolution, SSFLCD had broad application prospects and was once hailed as the most promising liquid crystal display of the 21st century. However, SSFLCD has not been widely adopted in practical applications, mainly due to difficulties in alignment, poor vibration resistance, and the inability to achieve continuous grayscale. To improve the alignment stability of SSFLCs, in 1992, Hikmet et al. of Philips proposed polymer-stabilized ferroelectric liquid crystals (PSFLCs). This involves introducing a polymer network to anchor the liquid crystal molecules in bulk, transforming the alignment of ferroelectric liquid crystals from the traditional surface anchoring mode to a combination of surface and bulk anchoring, thereby improving the vibration resistance of ferroelectric liquid crystal devices.

[0005] Besides ferroelectricity, another characteristic accompanying molecular chirality is the inherent helicity of molecules. The deformed helix ferroelectric (DHF) liquid crystal proposed by Beresnev et al. uses short-pitch ferroelectric liquid crystal materials to form a uniform helical structure between two parallel-aligned substrates. Photoelectric modulation is achieved by altering the distribution of ferroelectric liquid crystal molecules using an applied electric field. Because the DHF mode has continuously tunable grayscale, it has broad application prospects in the field of active-matrix-driving displays. The electrically suppressed helix (ESH) proposed by Chigrinov et al. has a high-contrast binary response and offers significant advantages in pulse-width modulated field-sequential color displays.

[0006] Based on the advantages of ferroelectric liquid crystal materials in terms of response speed, driving voltage, viewing angle, high resolution display, photoelectric effect, optical effect, and photorefractive effect, continuous improvement of ferroelectric liquid crystal materials to obtain ferroelectric liquid crystal materials with better performance has always been the goal pursued by the display field. Summary of the Invention

[0007] This invention provides a ferroelectric liquid crystal composition comprising at least one compound containing a nitrogen heterocycle as a first component and at least one compound containing a chiral group as a second component. By combining the compound containing the nitrogen heterocycle and the compound containing the chiral group, the ferroelectric liquid crystal composition comprising the compounds can effectively increase the phase width of the composition, increase the spontaneous polarization intensity, and increase the layer normal tilt angle, thereby achieving adjustable grayscale, low driving voltage, and microsecond-level ultrafast response.

[0008] The present invention provides a ferroelectric liquid crystal composition comprising a first component and a second component:

[0009] The first component comprises one or more compounds of general formula I.

[0010] as well as

[0011] The second component comprises one or more compounds of general formula II.

[0012]

[0013] in,

[0014] R M1 R M2 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 3-16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 3-16 carbon atoms may be independently replaced by -O-.

[0015] R1 and R2 each independently represent a chiral or achiral group, provided that at least one of R1 and R2 is a chiral group;

[0016] Z M1 and Z M2 Each can be represented independently as a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, or -(CH2)4-;

[0017] Z1 and Z2 independently represent single bonds, -CH2CH2-, -CF2CF2-, -CF2O-, -OCF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-;

[0018] ring ring and ring Each represents independently Among them, the One or more H atoms may be substituted by halogens, fluoroalkyl groups containing 1-3 (e.g., 1, 2 or 3) carbon atoms, or fluoroalkoxy groups containing 1-3 (e.g., 1, 2 or 3) carbon atoms; one or more -CH= may be substituted by -N=.

[0019] ring ring and ring Each represents independently in, One or more of the -CH2- can be replaced by -O-. One or more single bonds can be replaced by double bonds. One or more -H can be replaced by -CN, -F or -Cl. One or more of -CH= can be replaced by -N=.

[0020] n M1 Represents 0, 1, or 2, and when n M1 When it is 2, the ring They can be the same or different, Z M2 They can be the same or different;

[0021] n1 represents 0, 1, or 2, and when n1 is 2, the ring... They can be the same or different; Z2 can be the same or different.

[0022] The first component comprises at least one compound of general formula I containing a nitrogen heterocycle, wherein the compound of general formula I containing a nitrogen heterocycle comprises at least two Among them, the One or more -CH= radicals are replaced by -N= radicals.

[0023] In some embodiments of the invention, the first component comprises at least one compound of general formula I containing a nitrogen heterocycle, wherein the compound of general formula I containing a nitrogen heterocycle comprises at least two Each of them One to four (e.g., 1, 2, 3, 4) of -CH= can be replaced by -N= bases.

[0024] In some embodiments of the present invention, R M1 and R M2 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 3 to 16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms.

[0025] In some embodiments of the present invention, R M1 and R M2 Each independently represents a straight-chain or branched alkoxy group containing 3 to 16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms.

[0026] In some embodiments of the present invention, R M1 R represents a straight-chain or branched alkyl group containing 3-16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms. M2 It refers to a straight-chain or branched alkoxy group containing 3 to 16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms.

[0027] In some embodiments of the present invention, R M2 R represents a straight-chain or branched alkyl group containing 3-16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms. M1 It refers to a straight-chain or branched alkoxy group containing 3 to 16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms.

[0028] In some embodiments of the present invention, R1 is a chiral group.

[0029] In some embodiments of the present invention, R2 is a chiral group.

[0030] In some embodiments of the present invention, R1 represents a chiral group and R2 represents a non-chiral group.

[0031] In some embodiments of the present invention, R2 represents a chiral group and R1 represents a non-chiral group.

[0032] The chiral group described in this invention represents Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R12 R 13 R 14 Or R 15 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1-16 carbon atoms may be independently replaced by -O- or -CH=CH-; n a1 Represents an integer from 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12).

[0033] In some embodiments of the present invention, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each can be independently represented as -F, alkyl or alkoxy with 1-3 carbon atoms, or trifluoroalkyl or trifluoroalkoxy with 1-3 carbon atoms.

[0034] In some embodiments of the present invention, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each can be independently represented as -F, methyl, methoxy, monofluoroalkyl with 1-3 carbon atoms, monofluoroalkoxy with 1-3 carbon atoms, difluoroalkyl with 1-3 carbon atoms, difluoroalkoxy with 1-3 carbon atoms, trifluoroalkyl with 1-3 carbon atoms, or trifluoroalkoxy with 1-3 carbon atoms.

[0035] In some embodiments of the present invention, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each can be independently represented as -F, methyl, methoxy, monofluoromethyl, monofluoromethoxy, difluoromethyl, difluoromethoxy, trifluoromethyl, or trifluoromethoxy.

[0036] In some embodiments of the present invention, R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R13 R 14 Or R 15 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 2-16 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 2-16 carbon atoms may be independently replaced by -O- or -CH=CH-.

[0037] In some embodiments of the present invention, R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R 13 R 14 Or R 15 Each of the following independently represents a straight-chain or branched alkyl or alkoxy group containing 2-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 2-12 carbon atoms may be independently replaced by -O- or -CH=CH-.

[0038] The non-chiral group described in this invention represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms, wherein one or two or more non-adjacent -CH2- groups of the straight-chain or branched alkyl or alkoxy group containing 1-16 carbon atoms can be independently replaced by -O-, -CH=CH-, -CO-O- or -O-CO-.

[0039] In some embodiments of the present invention, Z M1 and Z M2 Each can be represented independently as a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, or -(CH2)4-.

[0040] In some embodiments of the present invention, Z M1 It represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, or -(CH2)4-.

[0041] In some embodiments of the present invention, Z M2 It represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, or -(CH2)4-.

[0042] In some embodiments of the present invention, Z1 represents a single bond, -CH2CH2-, -CF2CF2-, -CF2O-, -OCF2-, -CO-O-, -O-CO-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-.

[0043] In some embodiments of the present invention, Z2 represents a single bond, -CH2CH2-, -CF2CF2-, -CF2O-, -OCF2-, -CO-O-, -O-CO-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-.

[0044] In some embodiments of the present invention, the ring ring and ring Each represents independently Among them, the One or more H atoms can be substituted by -F, trifluoromethyl, or trifluoromethoxy, and one or more -CH= atoms can be substituted by -N=.

[0045] In some embodiments of the present invention, the ring ring and ring Each represents independently in, One or more of the -CH2- can be replaced by -O-. One or more single bonds can be replaced by double bonds. One or more -H can be replaced by -CN, -F or -Cl. One or more of -CH= can be replaced by -N=.

[0046] In some embodiments of the present invention, the compound of general formula I is selected from:

[0047]

[0048]

[0049]

[0050] as well as

[0051]

[0052] In some embodiments of the present invention, the first component comprises 0.1% to 65% by weight of the ferroelectric liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%. The percentages are 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, or a range between any two of these values. Preferably, the first component accounts for 0.1% to 60% of the weight percentage of the ferroelectric liquid crystal composition.

[0053] In some embodiments of the present invention, the group consisting of compounds of general formula I has the effect of increasing the phase width of the ferroelectric SMC* phase and increasing the spontaneous polarization intensity of Ps.

[0054] In some embodiments of the present invention, the group consisting of compounds of general formula I-1, general formula I-2, general formula I-4, general formula I-3, general formula I-4, general formula I-5, general formula I-17, general formula I-18, general formula I-25, general formula I-26, general formula I-35, and general formula I-36 has the effect of lowering the melting point, increasing the lower limit phase width of the ferroelectric SMC* phase, and increasing the spontaneous polarization intensity of Ps.

[0055] In some embodiments of the present invention, the compounds of general formula I-6, general formula I-7, general formula I-8, general formula I-9, general formula I-10, general formula I-11, general formula I-12, general formula I-13, general formula I-14, general formula I-15, general formula I-16, general formula I-19, general formula I-20, general formula I-21, and general formula I-22 are mentioned. The group consisting of compounds of formula I-23, general formula I-24, general formula I-27, general formula I-28, general formula I-29, general formula I-30, general formula I-31, general formula I-32, general formula I-33, general formula I-34, general formula I-36, general formula I-37 and / or general formula I-38 has the effect of increasing the upper limit phase width of the ferroelectric SMC* phase and increasing the spontaneous polarization intensity of Ps.

[0056] In some embodiments of the present invention, the compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-17, general formula I-18, general formula I-25, general formula I-26, general formula I-35, and general formula I-36 accounts for 0%-85% by weight of the first component (inclusive of any value or subrange within this range). For example, 0%, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, etc. 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83% The weight percentage of the compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-17, general formula I-18, general formula I-25, general formula I-26, general formula I-35, and general formula I-36 is 0%-80% of the first component.

[0057] In some embodiments of the present invention, the first component comprises at least one (e.g., one, two, three, four, five, six, seven, or eight) compound selected from general formulas I-6, I-7, I-8, I-9, I-10, I-11, I-12, I-13, I-14, I-15, I-16, and I-19. Compounds comprising the group consisting of compounds of formula I-20, compounds of general formula I-21, compounds of general formula I-22, compounds of general formula I-23, compounds of general formula I-24, compounds of general formula I-27, compounds of general formula I-28, compounds of general formula I-29, compounds of general formula I-30, compounds of general formula I-31, compounds of general formula I-32, compounds of general formula I-33, compounds of general formula I-34, compounds of general formula I-36, compounds of general formula I-37 and / or compounds of general formula I-38.

[0058] In some embodiments of the present invention, compounds selected from general formulas I-6, I-7, I-8, I-9, I-10, I-11, I-12, I-13, I-14, I-15, I-16, I-19, I-20, I-21, I-22, I-23, and I-24 are used. The compounds of the group consisting of compounds of formula I-27, general formula I-28, general formula I-29, general formula I-30, general formula I-31, general formula I-32, general formula I-33, general formula I-34, general formula I-36, general formula I-37 and / or general formula I-38 constitute 0.1% to 100% by weight of the first component (inclusive of any value or subrange within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%. %, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, or a range between any two of these values.

[0059] In some embodiments of the invention, the first component comprises 0%-85% (inclusive of any value or subrange within this range) by weight of the first component, for example, 0%, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%. 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59% 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, or any range between any two of these values, are selected from compounds of general formula I-1, compounds of general formula I-2, compounds of general formula I-3, and compounds of general formula I-4. Compounds of the group consisting of compounds of formulas I-4, I-5, I-17, I-18, I-25, I-26, I-35, and I-36, and / or, comprising 0.1% to 100% (inclusive of any value or subrange within this range) of the first component by weight, for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47% 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 9 The selection of compounds of general formula I-6, I-7, I-8, I-9, I-10, I-11, I-12, I-13, I-14, I-15, I-16, I-19, and I-15, or any two of these formulas, is based on compounds of general formula I-6, I-7, I-8, I-9, I-10, I-11, I-12, I-13, I-14, I-15, I-16, I-19, and I-15. Compounds of formula I-20, I-21, I-22, I-23, I-24, I-27, I-28, I-29, I-30, I-31, I-32, I-33, I-34, I-36, I-37, and / or I-38.

[0060] In some embodiments of the present invention, the compound of general formula II is selected from:

[0061]

[0062]

[0063]

[0064]

[0065] as well as

[0066]

[0067] In some embodiments of the present invention, R1 represents... Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R 13 R 14 Or R 15 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1-16 carbon atoms may be independently replaced by -O- or -CH=CH-; n a1 Represents integers from 3 to 12.

[0068] In some embodiments of the present invention, R2 represents... Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R 13 R 14 Or R 15Each independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1-16 carbon atoms may be independently replaced by -O- or -CH=CH-; n a1 Represents integers from 3 to 12.

[0069] In some embodiments of the present invention, R1 represents... Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R 13 R 14 Or R 15 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1-16 carbon atoms may be independently replaced by -O- or -CH=CH-; n a1 R2 represents an integer from 3 to 12; R2 represents a straight-chain or branched alkyl or alkoxy group containing 1 to 16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1 to 16 carbon atoms may be independently replaced by -O-, -CH=CH-, -CO-O-, or -O-CO-.

[0070] In some embodiments of the invention, R1 represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups in the straight-chain or branched alkyl or alkoxy group containing 1-16 carbon atoms can be independently replaced by -O-, -CH=CH-, -CO-O-, or -O-CO-; R2 represents Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R 13 R 14 Or R 15 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1-16 carbon atoms may be independently replaced by -O- or -CH=CH-; n a1 Represents integers from 3 to 12.

[0071] In some embodiments of the present invention, the second component constitutes 0.1%-75% (inclusive of any value or subrange within this range) of the ferroelectric liquid crystal composition by weight, for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%. The percentages are 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, or a range between any two of these values. Preferably, the second component accounts for 20%-70% of the weight percentage of the ferroelectric liquid crystal composition.

[0072] In some embodiments of the present invention, R1 and R2 are each independently represented in compounds selected from the group consisting of compounds of general formula II-18, general formula II-19, general formula II-20, general formula II-21, general formula II-22, general formula II-23, general formula II-24, general formula II-25, general formula II-26, general formula II-27, general formula II-29, general formula II-30, general formula II-31, general formula II-32, general formula II-33, general formula II-34, general formula II-35, general formula II-38, general formula II-39 and / or general formula II-47. Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R 12R 13 R 14 Or R 15 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1-16 carbon atoms may be independently replaced by -O- or -CH=CH-; n a1 Represents integers from 3 to 12.

[0073] In some embodiments of the present invention, compounds selected from general formula II-18, general formula II-19, general formula II-20, general formula II-21, general formula II-22, general formula II-23, general formula II-24, general formula II-25, general formula II-26, general formula II-27, general formula II-29, general formula II-30, general formula II-31, general formula II-32, general formula II-33, and general formula II-34 are used. The compounds comprising the group consisting of compounds of formula II-35, general formula II-38, general formula II-39, and / or general formula II-47 constitute 0.1-60% by weight of the ferroelectric liquid crystal composition, for example: 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%. 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, or a range between any two of these values, preferably selected from compounds of general formula II-18, general formula II-19, general formula II-20, general formula II-21, general formula II-22, and general formula I The compounds comprising the group consisting of compounds of formula I-23, formula II-24, formula II-25, formula II-26, formula II-27, formula II-29, formula II-30, formula II-31, formula II-32, formula II-33, formula II-34, formula II-35, formula II-38, formula II-39 and / or formula II-47 constitute 5%-60% by weight of the ferroelectric liquid crystal composition.

[0074] In some embodiments of the present invention, compounds selected from general formula II-1, general formula II-2, general formula II-3, general formula II-4, general formula II-5, general formula II-6, general formula II-7, general formula II-8, general formula II-9, general formula II-10, general formula II-11, general formula II-12, general formula II-13, general formula II-14, and general formula II-1 In compounds of formula II-5, formula II-16, formula II-17, formula II-28, formula II-36, formula II-37, formula II-39, formula II-40, formula II-41, formula II-42, formula II-43, formula II-44, formula II-45, and / or formula II-46, one of R1 and R2 represents the compound. Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R 13 R 14 Or R 15 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy groups containing 1-16 carbon atoms may be independently replaced by -O- or -CH=CH-; n a1R1 represents an integer from 3 to 12; and the other of R1 and R2 represents a straight-chain or branched alkyl or alkoxy group containing 1 to 16 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms, wherein one or two or more non-adjacent -CH2- groups can be independently replaced by -O-, -CH=CH-, -CO-O- or -O-CO-.

[0075] In some embodiments of the present invention, compounds selected from general formula II-1, general formula II-2, general formula II-3, general formula II-4, general formula II-5, general formula II-6, general formula II-7, general formula II-8, general formula II-9, general formula II-10, general formula II-11, general formula II-12, general formula II-13, general formula II-14, general formula II-15, general formula II-16, general formula II-17, general formula II-28, general formula II-36, and general formula I... The compounds comprising the group consisting of compounds of formula I-37, formula II-39, formula II-40, formula II-41, formula II-42, formula II-43, formula II-44, formula II-45, and / or formula II-46 constitute 1%-50% by weight of the ferroelectric liquid crystal composition, for example: 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%. %, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, or a range between any two of these values, preferably selected from compounds of general formula II-1, general formula II-2, general formula II-3, general formula II-4, general formula II-5, general formula II-6, general formula II-7, general formula II-8, general formula II-9, general formula II-10, and general formula II-11. The compounds comprising the group consisting of compounds of general formula II-12, general formula II-13, general formula II-14, general formula II-15, general formula II-16, general formula II-17, general formula II-28, general formula II-36, general formula II-37, general formula II-39, general formula II-40, general formula II-41, general formula II-42, general formula II-43, general formula II-44, general formula II-45, and / or general formula II-46 constitute 5%-45% by weight of the ferroelectric liquid crystal composition.

[0076] In some embodiments of the present invention, the compound of general formula II is selected from:

[0077]

[0078]

[0079] as well as

[0080] as well as

[0081]

[0082] The ferroelectric liquid crystal composition of the present invention further comprises one or more compounds of general formula III.

[0083]

[0084] R N1 It refers to a straight-chain or branched alkyl or alkoxy group containing 3-16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl or alkoxy group containing 3-16 carbon atoms may be independently replaced by -O-.

[0085] R N2 It indicates a haloalkyl or haloalkoxy group containing 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms;

[0086] Z N1 and Z N2 Each can be represented independently as a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, or -(CH2)4-;

[0087] ring ring and ring Each represents independently Among them, the One or more of the -CH2- can be replaced by -O-. One or more single bonds can be replaced by double bonds. One or more -H atoms may be substituted by halogens, fluoroalkyl groups containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or fluoroalkoxy groups containing 1-3 (e.g., 1, 2, or 3) carbon atoms. One or more of -CH= can be replaced by -N=;

[0088] n N1 Each is independently 0, 1, or 2, and when n N1 When it is 2, the ring They can be the same or different, Z N2 They can be the same or different.

[0089] In some embodiments of the present invention, the compound of general formula III contains at least two Among them, the One or more of the -CH2- can be replaced by -O-, the One or more H atoms can be substituted by -F, trifluoromethyl, or trifluoromethoxy.

[0090] In some embodiments of the invention, the compound of general formula III contains two Among them, the One or more of the -CH2- can be replaced by -O-, the One or more H atoms can be substituted by -F, trifluoromethyl, or trifluoromethoxy.

[0091] In some embodiments of the invention, the compound of general formula III contains three... Among them, the One or more of the -CH2- can be replaced by -O-, the One or more H atoms can be substituted by -F, trifluoromethyl, or trifluoromethoxy.

[0092] In some embodiments of the present invention, R N1 It refers to a straight-chain or branched alkyl group containing 3 to 16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms.

[0093] In some embodiments of the present invention, R N1 It refers to a straight-chain or branched alkoxy group containing 3 to 16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms.

[0094] In some embodiments of the present invention, R N2 It indicates a fluoroalkyl group containing 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms.

[0095] In some embodiments of the present invention, R N2 It indicates a fluoroalkoxy group containing 1-5 (e.g., 1, 2, 3, 4 or 5) carbon atoms.

[0096] In some embodiments of the present invention, R N2 It indicates a trifluoroalkoxy group containing 1-5 (e.g., 1, 2, 3, 4 or 5) carbon atoms.

[0097] In some embodiments of the present invention, R N2 It indicates a trifluoroalkoxy group containing 1-3 (e.g., 1, 2 or 3) carbon atoms.

[0098] In some embodiments of the present invention, R N2 It represents trifluoromethoxy.

[0099] In some embodiments of the present invention, Z N1 and Z N2 Each can be represented independently as a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, or -(CH2)4-.

[0100] In some embodiments of the present invention, Z N1 It represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, or -(CH2)4-.

[0101] In some embodiments of the present invention, Z N2 It represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2-, or -(CH2)4-.

[0102] In some embodiments of the present invention, Z1 and Z2 each independently represent a single bond, -CH2CH2-, -CF2CF2-, -CF2O-, -OCF2-, -CO-O-, -O-CO-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-.

[0103] In some embodiments of the present invention, the ring ring and ring Each represents independently Among them, the One or more of the -CH2- can be replaced by -O-. One or more single bonds can be replaced by double bonds. One or more -H atoms can be replaced by -F, trifluoromethyl, or trifluoromethoxy. One or more of -CH= can be replaced by -N=.

[0104] In some embodiments of the present invention, the compound of general formula III is selected from:

[0105]

[0106]

[0107]

[0108] as well as

[0109]

[0110] In some embodiments of the invention, the compound of general formula III constitutes 0%-75% (inclusive of any value or subrange within this range) of the ferroelectric liquid crystal composition by weight, for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%. The percentages are 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, or a range between any two of these values. Preferably, the compound of general formula III accounts for 0%-70% of the weight percentage of the ferroelectric liquid crystal composition.

[0111] In some embodiments of the present invention, the group consisting of compounds of general formula III has the ability to adjust the tilt cone angle θ and broaden the phase width of ferroelectric SMC*.

[0112] Another aspect of the present invention provides a display device comprising the ferroelectric liquid crystal composition described herein.

[0113] The ferroelectric liquid crystal composition of the present invention has the advantages of high transmittance, high contrast, large phase transition range, small pitch, and high spontaneous polarization intensity. The display device containing the ferroelectric liquid crystal composition of the present invention has high bright state transmittance, low dark state transmittance, high contrast, strong spontaneous polarization intensity, and fast switching time. The display device has adjustable grayscale, low driving voltage, and microsecond-level ultrafast response. Detailed Implementation

[0114] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0115] For ease of explanation, in the following embodiments, the group structures of the liquid crystal compounds are represented by the codes listed in Table 1:

[0116] Table 1. Group structure codes of liquid crystal compounds

[0117]

[0118]

[0119] Take the following compound with the following structural formula as an example:

[0120]

[0121] If the structural formula is represented by the codes listed in Table 1, it can be expressed as: nCCGF, where n in the code represents the number of C atoms in the alkyl group at the left end. For example, if n is "3", it means that the alkyl group is -C3H7. In the code, C represents cyclohexyl, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0122] As the pitch (P0) increases, the Bragg diffraction effect intensifies, and the diffraction wavelength shifts from the short-wavelength region to the visible and infrared regions, thereby reducing the contrast of the application environment. When ferroelectric liquid crystal compositions are used in the visible light band with wavelengths of 300-800nm, the diffraction band should be controlled in the UV short-wavelength region, with P0 < 120nm; when used in the infrared band, P0 < 1000nm.

[0123] Bragg diffraction: 2dsinθ=nλ,λ max = Average refractive index * P0. Where d is the interplanar spacing, θ is the angle between the incident ray, the reflected ray and the reflecting crystal plane, λ is the wavelength, and n is the reflection order.

[0124] According to the ferroelectric liquid crystal transmittance formula: The penetration rate is maximized when θ = 45° and Δnd = λ / 2.

[0125] The abbreviated codes for the test items and the test conditions in the following examples are as follows:

[0126] θ: The angle of inclination of the cone relative to the helical axis.

[0127] Ps: Spontaneous polarization intensity

[0128] Bright state TR / %: Bright state transmittance

[0129] Dark-state TR / %: Dark-state transmittance

[0130] CR: Contrast Ratio

[0131] τ off Conversion time

[0132] P pitch

[0133] in,

[0134] Phase transition temperature: obtained by DSC, 2° / min test.

[0135] Pitch: Tested using a wedge box and measured with a reading microscope. θ: Measured using a ferroelectric measuring instrument.

[0136] Ps: Measured using a ferroelectric measuring instrument.

[0137] Bright state TR / %: The VT curve of the dimming device was tested using a DMS 505 optoelectronic comprehensive tester. The maximum transmittance on the VT curve was taken in the bright state. The test box was a parallel alignment box with a thickness of 1.5μm.

[0138] Dark-state TR / %: The VT curve of the dimming device was tested using a DMS 505 optoelectronic comprehensive tester. The minimum transmittance value was taken in the dark state. The test box was a parallel alignment box with a thickness of 1.5μm.

[0139] Contrast Ratio (CR): The ratio of bright state Tr% to dark state Tr%.

[0140] τ off The results were obtained using a DMS505 tester at 25°C. Test conditions: 25°C, V100 drive, parallel alignment test box with a thickness of 1.5μm.

[0141] Liquid crystal media were prepared according to the proportions of the liquid crystal compositions specified in the following examples. The liquid crystal media were prepared according to conventional methods in the art, such as mixing in a specified proportion by heating, ultrasound, suspension, etc.

[0142] The liquid crystal media given in the following examples were prepared and studied. The composition of each liquid crystal medium and the test results of its performance parameters are shown below.

[0143] In this invention, the compound of general formula I in the first component is represented in two parts. The weight percentage relationship of the first part can be represented by Table 2, denoted by "P1", and the weight percentage relationship of the second part can be represented by Table 3, denoted by "P1'".

[0144] Table 2 Composition and proportions of the first component, part P1

[0145] P1-1 P1-2 P1-3 P1-4 5MPP7 / / 15 35 6MPP5 74 65 20 20 6MPO8 / / 10 25 7OMPO9 / / 33 10 8ONPO10 26 35 22 10 total 100 100 100

[0146] Table 3 Composition and proportions of the second part of the first component, P1'

[0147] P1'-1 P1'-2 7PGPO7 30 15 6CGPO9 40 10 7OPGPO10 20 40 7OPGPO12 10 35 total 100 100

[0148] The compound of general formula II in the second component of this invention may be selected from:

[0149]

[0150]

[0151] as well as

[0152] as well as

[0153]

[0154] The proportions of compounds of general formula III contained in the third component of this invention are shown in Table 4, denoted by "P3":

[0155] Table 4 Composition and proportions of the third component P3

[0156] P3-1 9PPOCF3 55 8PPOCF3 22 9PGOCF3 10 8MPOCF3 6 9MPOCF3 7 total 100

[0157] Example 1

[0158] The liquid crystal medium of Example 1 was prepared according to the compounds and weight percentages listed in Table 5, and was filled between the two substrates of the liquid crystal display for performance testing.

[0159] Table 5. Formulation and performance parameter test results of ferroelectric liquid crystal compositions

[0160]

[0161] Example 2

[0162] The ferroelectric liquid crystal composition of Example 2 was prepared according to the compounds and weight percentages listed in Table 6, and was filled between the two substrates of the liquid crystal display for performance testing.

[0163] Table 6. Formulation and Performance Parameter Test Results of Ferroelectric Liquid Crystal Compositions

[0164]

[0165] Example 3

[0166] The ferroelectric liquid crystal composition of Example 3 was prepared according to the compounds and weight percentages listed in Table 7, and was filled between the two substrates of the liquid crystal display for performance testing.

[0167] Table 7. Formulation and Performance Parameter Test Results of Ferroelectric Liquid Crystal Composition

[0168]

[0169]

[0170] Example 4

[0171] The ferroelectric liquid crystal composition of Example 4 was prepared according to the compounds and weight percentages listed in Table 8, and was filled between the two substrates of the liquid crystal display for performance testing.

[0172] Table 8. Formulation and Performance Parameter Test Results of Ferroelectric Liquid Crystal Compositions

[0173]

[0174] Example 5

[0175] The ferroelectric liquid crystal composition of Example 5 was prepared according to the compounds and weight percentages listed in Table 9, and was filled between the two substrates of the liquid crystal display for performance testing.

[0176] Table 9. Test Results of Ferroelectric Liquid Crystal Composition Formulation and Performance Parameters

[0177]

[0178] Example 6

[0179] The ferroelectric liquid crystal composition of Example 6 was prepared according to the compounds and weight percentages listed in Table 10, and was filled between the two substrates of the liquid crystal display for performance testing.

[0180] Table 10. Test Results of Ferroelectric Liquid Crystal Composition Formulation and Performance Parameters

[0181]

[0182] Example 7

[0183] The ferroelectric liquid crystal composition of Example 7 was prepared according to the compounds and weight percentages listed in Table 11, and was filled between the two substrates of the liquid crystal display for performance testing.

[0184] Table 11. Test Results of Ferroelectric Liquid Crystal Composition Formulation and Performance Parameters

[0185]

[0186] Example 8

[0187] The ferroelectric liquid crystal composition of Example 8 was prepared according to the compounds and weight percentages listed in Table 12, and was filled between the two substrates of the liquid crystal display for performance testing.

[0188] Table 12. Test Results of Ferroelectric Liquid Crystal Composition Formulation and Performance Parameters

[0189]

[0190] Example 9

[0191] The ferroelectric liquid crystal composition of Example 9 was prepared according to the compounds and weight percentages listed in Table 13, and was filled between the two substrates of the liquid crystal display for performance testing.

[0192] Table 13. Test results of ferroelectric liquid crystal composition formulation and performance parameters.

[0193]

[0194] As can be seen from the above Examples 1-9, the ferroelectric liquid crystal composition of the present invention, which includes the first component and the second component, has the advantages of high transmittance, high contrast, large phase transition range, small pitch, and high spontaneous polarization intensity. The display device containing the ferroelectric liquid crystal composition of the present invention has high bright state transmittance, low dark state transmittance, large contrast, strong spontaneous polarization intensity, and fast switching time.

[0195] The present invention can also be implemented in various other ways. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A ferroelectric liquid crystal composition, the ferroelectric liquid crystal composition comprising a first component and a second component: The first component comprises one or more compounds of general formula I. as well as The second component comprises one or more compounds of general formula II. in, R M1 , R M2 each independently represents a linear or branched alkyl or alkoxy group having from 3 to 16 carbon atoms, one or non-adjacent two or more -CH2- in the linear or branched alkyl or alkoxy group having from 3 to 16 carbon atoms can each independently be replaced by -O-; R1 and R2 each independently represent a chiral or achiral group, provided that one of R1 and R2 is a chiral group and the other is an achiral group; Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2- or -(CH2)4-; Z1 and Z2 independently represent single bonds, -CH2CH2-, -CF2CF2-, -CF2O-, -OCF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-; ring ring and ring Each represents independently Among them, the One or more H atoms may be substituted by halogens, fluoroalkyl groups containing 1-3 carbon atoms, or fluoroalkoxy groups containing 1-3 carbon atoms; one or more -CH= atoms may be substituted by -N= atoms. ring ring and ring Each represents independently in, One or more of the -CH2- can be replaced by -O-. One or more single bonds can be replaced by double bonds. One or more -H can be replaced by -CN, -F or -Cl. One or more of -CH= can be replaced by -N=. n M1 Represents 0, 1, or 2, and when n M1 When it is 2, the ring Same or different, Z M2 Same or different; n1 indicates that 0, 1, or 2 has been confirmed, and when n1 is 2, the ring... Same or different, Z2 same or different; The first component comprises at least one compound of general formula I containing a nitrogen heterocycle, wherein the compound of general formula I containing a nitrogen heterocycle comprises at least two Among them, the One or more -CH= radicals are replaced by -N= radicals.

2. The ferroelectric liquid crystal composition according to claim 1, characterized in that, The first component comprises at least one compound of general formula I containing a nitrogen heterocycle, wherein the compound of general formula I containing a nitrogen heterocycle comprises at least two Each of them In the first four -CH= radicals, -N= radicals are replaced.

3. The ferroelectric liquid crystal composition according to claim 1 or 2, characterized in that, The R M1 and R M2 Each independently represents a straight-chain or branched alkyl or alkoxy group containing 3-16 carbon atoms. Preferably, the R M1 and R M2 Each independently represents a straight-chain or branched alkoxy group containing 3 to 16 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16) carbon atoms; Preferably, R M1 R represents a straight-chain or branched alkyl group containing 3-16 carbon atoms. M2 This refers to a straight-chain or branched alkoxy group containing 3-16 carbon atoms. Preferably, the R M2 R indicates a straight-chain or branched alkyl group containing 3-16 carbon atoms. M1 It refers to a straight-chain or branched alkoxy group containing 3-16 carbon atoms.

4. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The compounds of general formula I are selected from:

5. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The first component accounts for 0.1%-65% of the weight percentage of the ferroelectric liquid crystal composition, preferably 0.1%-60% by weight.

6. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-17, general formula I-18, general formula I-25, general formula I-26, general formula I-35, and general formula I-36 accounts for 0%-85% of the weight percentage of the first component. Preferably, the compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-17, general formula I-18, general formula I-25, general formula I-26, general formula I-35, and general formula I-36 accounts for 0%-80% of the weight percentage of the first component.

7. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The first component comprises at least one compound selected from general formula I-6, general formula I-7, general formula I-8, general formula I-9, general formula I-10, general formula I-11, general formula I-12, general formula I-13, general formula I-14, general formula I-15, general formula I-16, general formula I-19, general formula I-20, and general formula I-21. Compounds comprising the group consisting of compounds of general formula I-22, general formula I-23, general formula I-24, general formula I-27, general formula I-28, general formula I-29, general formula I-30, general formula I-31, general formula I-32, general formula I-33, general formula I-34, general formula I-36, general formula I-37 and / or general formula I-38.

8. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, Compounds of general formula I-6, I-7, I-8, I-9, I-10, I-11, I-12, I-13, I-14, I-15, I-16, I-19, I-20, I-21, I-22, and I-23 were selected. The compounds comprising the group consisting of compounds of formula 3, formula I-24, formula I-27, formula I-28, formula I-29, formula I-30, formula I-31, formula I-32, formula I-33, formula I-34, formula I-36, formula I-37, and / or formula I-38 constitute 0.1% to 100% by weight of the first component. Preferably, the first component comprises 0%-85% by weight of a compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-17, general formula I-18, general formula I-25, general formula I-26, general formula I-35, and general formula I-36, and / or 0.1%-100% by weight of a compound selected from general formula I-6, general formula I-7, general formula I-8, general formula I-9, general formula I-10, and general formula I-11. Compounds comprising the group consisting of compounds of general formula I-12, general formula I-13, general formula I-14, general formula I-15, general formula I-16, general formula I-19, general formula I-20, general formula I-21, general formula I-22, general formula I-23, general formula I-24, general formula I-27, general formula I-28, general formula I-29, general formula I-30, general formula I-31, general formula I-32, general formula I-33, general formula I-34, general formula I-36, general formula I-37, and / or general formula I-38.

9. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The compounds of general formula II are selected from:

10. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, Chiral group representation Among them, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Y 10 Y 11 Y 12 Y 13 Or Y 14 Each of the following independently represents a halogen, an alkyl or alkoxy group containing 1-3 carbon atoms, or a haloalkyl or haloalkoxy group containing 1-3 carbon atoms; R4, R5, R6, R7, R8, R9, R 10 R 11 R 12 R 13 R 14 Or R 15 Each of the following groups independently represents a straight-chain or branched alkyl or alkoxy group containing 1-16 carbon atoms, wherein one or more non-adjacent -CH2- groups can be independently replaced by -O- or -CH=CH-; the non-chiral group represents a straight-chain or branched alkyl or alkoxy group containing 1-16 carbon atoms, wherein one or more non-adjacent -CH2- groups can be independently replaced by -O-, -CH=CH-, -CO-O-, or -O-CO-; n a1 Represents integers from 3 to 12.

11. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The second component accounts for 0.1%-75% of the weight of the ferroelectric liquid crystal composition, preferably 20%-70% of the weight of the ferroelectric liquid crystal composition.

12. The ferroelectric liquid crystal composition according to claim 1, characterized in that, The ferroelectric liquid crystal composition further comprises one or more compounds of general formula III. R N1 It refers to a straight-chain or branched alkyl or alkoxy group containing 3-16 carbon atoms, wherein one or more of the -CH2- groups that are not adjacent to each other can be independently replaced by -O-. R N2 This indicates a haloalkyl or haloalkoxy group containing 1-5 carbon atoms; Z N1 and Z N2 Each can be represented independently as a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, or -(CH2)4-; ring ring and ring Each represents independently Among them, the One or more of the -CH2- can be replaced by -O-. One or more single bonds can be replaced by double bonds. One or more -H atoms may be substituted by halogens, fluoroalkyl groups containing 1-3 carbon atoms, or fluoroalkoxy groups containing 1-3 carbon atoms. One or more of -CH= can be replaced by -N=; n N1 Each is independently 0, 1, or 2, and when n N1 When it is 2, the ring Same or different, Z N2 Same or different.

13. The ferroelectric liquid crystal composition according to claim 1, characterized in that, Compounds of general formula III contain at least two Among them, the One or more of the -CH2- can be replaced by -O-, the One or more H atoms can be substituted by -F, trifluoromethyl, or trifluoromethoxy. Preferably, the compound of general formula III contains three Among them, the One or more of the -CH2- can be replaced by -O-, the One or more H atoms can be substituted by -F, trifluoromethyl, or trifluoromethoxy. Preferably, R N1 It refers to a straight-chain or branched alkyl group containing 3-16 carbon atoms. Preferably, R N2 This indicates a fluoroalkyl group containing 1-5 carbon atoms. Preferably, R N2 It indicates a fluoroalkoxy group containing 1-5 carbon atoms.

14. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The compounds of general formula III are selected from:

15. The ferroelectric liquid crystal composition according to any one of the preceding claims, characterized in that, The compound of general formula III accounts for 0%-75% of the weight percentage of the ferroelectric liquid crystal composition, preferably, the compound of general formula III accounts for 0%-70% of the weight percentage of the ferroelectric liquid crystal composition.

16. A liquid crystal display device comprising the ferroelectric liquid crystal composition according to any one of claims 1-15.

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