Liquid crystal light control device

Abstract

The present invention provides a liquid crystal light control device, which includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer and an upper substrate, the alignment directions of the upper alignment layer and the lower alignment layer are parallel alignment, the guest-host liquid crystal composition layer includes at least one dichroic dye, at least one chiral agent and at least one liquid crystal composition, and the liquid crystal composition includes at least one liquid crystal compound of general formula N. The liquid crystal light control device of the present invention has an appropriate transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra), and wide temperature range. The light control device of the present invention has a high display effect at the moment of turning off the power after being energized for 2 hours, and can effectively avoid the problems of display unevenness and burn-in.

Description

[Technical field]

[0001] The present invention belongs to the technical field of light control devices, and relates to a liquid crystal light control device. [Background technology]

[0002] At present, the application of liquid crystal dimming devices in the fields of architecture and transportation is becoming more and more widespread, and liquid crystal dimming devices are required to have a wide temperature application range, especially to be able to be used normally at high temperatures. In the conventional smart dimming panel market, there are products such as polymer dispersed liquid crystal (PDLC) smart dimming devices and electrochromic smart dimming devices. PDLC smart dimming devices can smartly switch between transparent and cloudy without shading or heat insulation, while electrochromic smart dimming devices have problems such as a complicated film formation process, a long response time (8 to 20 s), and a bluish color in the dark state. Guest-host liquid crystal dimming devices use the selective absorption of light by dichroic dye molecules in the liquid crystal to realize switching between bright and dark states, and greatly improve optical performance such as the purity of the black state and response time compared with conventional PDLC and electrochromic smart dimming devices.

[0003] The guest-host type liquid crystal light control device avoids the shortcomings of the traditional modulation device, displays with high brightness, guarantees the optical display effect, and extends the service life. However, there are still many technical challenges in the light modulation device manufactured with the liquid crystal composition doped with the dichroic dye. Generally, in order to increase the transmittance in the dark state of the guest-host type liquid crystal light control device and improve the contrast, the concentration of the dye molecules in the dye-doped liquid crystal mixture can be increased or the cell thickness can be increased. However, when the concentration of the dichroic dye molecules is large, it will precipitate from the liquid crystal and affect the liquid crystal performance, so the concentration of the dye-doped liquid crystal in the dye-doped liquid crystal molecules is generally limited. On the other hand, the contrast can be improved by improving the manufacturing process and increasing the liquid crystal cell thickness. However, the retardation (Δn×d) is generally constant, and the liquid crystal display device with a large cell thickness always has a liquid crystal composition with small optical anisotropy, and the small optical anisotropy often leads to a decrease in contrast.

[0004] On the other hand, in order to improve the contrast of a single cell dye-doped liquid crystal, a chiral agent is introduced into the dye-doped liquid crystal to increase the twist degree of the liquid crystal molecules in the liquid crystal cell and reduce the P (steepness factor) value. In the initial state, the super-twisted negative liquid crystal is aligned vertically to the substrate, and when it is driven, the negative liquid crystal molecules are tilted and twisted by the action of the chiral agent, and the dye molecules are twisted along with the twist of the liquid crystal molecules, absorbing light of multiple polarization directions and exhibiting a dark state with lower transmittance, thereby improving the contrast. However, the conventional device structure still has problems of poor display, non-uniform alignment, display unevenness and burn-in.

[0005] Burn-in occurs when the liquid crystal is polarized and deflected after a long period of driving, and is not controlled by the signal voltage, causing the same image to be displayed on the screen within a certain period of time. The phenomenon weakens over time and eventually disappears. Burn-in can be divided into line burn-in and surface burn-in. Line burn-in is closely related to the reliability of the liquid crystal material itself. The performance parameter that often represents the reliability of the liquid crystal material is the voltage holding ratio (VHR). The higher the VHR, the less likely the liquid crystal material is to be affected by interference factors (such as liquid crystal impurities, high and low temperatures, UV radiation, etc.).

[0006] How to solve the above problems is an urgent issue for those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the shortcomings of the prior art, the objective of the present invention is to provide a liquid crystal light control device which has high transmittance, high contrast and high stability (VHR(initial), VHR(RA)), can effectively solve the problems of display unevenness and burn-in, and meets the requirements for the temperature usage range in fields such as architecture and transportation. [Means for solving the problem]

[0008] In order to achieve the object of the present invention, the present invention uses the following technical means.

[0009] In one embodiment, the liquid crystal light control device according to the present invention includes, in order from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate; The orientation directions of the upper and lower alignment layers are parallel to each other, The guest-host liquid crystal composition layer comprises at least one dichroic dye, at least one chiral agent, and at least one liquid crystal composition; The liquid crystal composition comprises at least one liquid crystal compound represented by general formula N, [ka] During the ceremony, R N1 and R N2 are each independently 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; [ka] one or two or more non-adjacent -CH2- groups in a linear or branched alkyl group containing 1 to 12 carbon atoms may each be 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 more single bonds in the ring may be replaced by a double bond; [ka] one or more -H in the ring may be independently replaced by -F, -Cl or -CN, and one or more -CH= in the ring may be independently replaced by -N=; 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-, L N1 and L N2each independently represents -H, a halogen, an alkyl group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms, or an alkoxy group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms; n N1 represents 0, 1, 2 or 3; n N2 represents 0 or 1, 0≦n N1 +n N2 ≦3, n N1 = 2 or 3, [ka] may be the same or different, Z N1 may be the same or different.

[0010] In some embodiments of the present invention, the compound of general formula N is [ka] [ka] [ka] is selected from the group consisting of compounds In the formula, R N1 and R N2 has the same definition as in general formula N.

[0011] 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 98% (including any numerical value or subrange therein), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 25%, 26%, 28%, 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%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, 102%, 104%, 105%, 106%, 107%, 108%, 109%, 109, 109, 102, 103%, 104, 105, 106, 107, 108, 109, 109, 109, 108, 1 2%, 34%, 35%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, or a range between any two of those numbers.

[0012] In order to obtain a high display effect and effectively avoid the problems of display unevenness and burn-in, the compound of general formula N is a compound selected from the group consisting of the compound of general formula N-2, the compound of general formula N-5, and the compound of general formula N-11.

[0013] In some embodiments of the present invention, preferably, R N1 and R N2 each independently represents a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms, and more preferably R N1 and R N2 each independently represents a linear or branched alkyl group containing 1 to 8 carbon atoms, a linear or branched alkoxy group containing 1 to 7 carbon atoms, or a linear or branched alkenyl group containing 2 to 8 carbon atoms, and more preferably R N1 and R N2 each independently represents a linear or branched alkyl group containing 1 to 5 carbon atoms, a linear or branched alkoxy group containing 1 to 4 carbon atoms, or a linear or branched alkenyl group containing 2 to 5 carbon atoms.

[0014] In the present invention, the numerical range relating to the case where the number of carbon atoms of a group is limited means that the number of carbon atoms is all selectable integers within the limited range, for example, 1 to 10 carbon atoms means that the number of carbon atoms may be 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and is inferred thereby.

[0015] In some embodiments of the present invention, the dielectric anisotropy of the liquid crystal component is <0 (eg, <-1, <-2, <-2, <-3, <-4, <-5, <-6).

[0016] In the present invention, when the alignment directions of the upper alignment layer and the lower alignment layer are parallel, the twist of the liquid crystal molecules can be suppressed, and when the light control device is in an energized state, reverse twist is less likely to occur, and the super-twisted negative liquid crystal has a better twist state, so that the liquid crystal light control device of the present invention can display more uniformly and effectively improve the problem of burn-in.

[0017] In some embodiments of the present invention, the dichroic dye molecules are one or more dyes selected from the group consisting of ouzo, anthraquinone, phthalocyanine, cyanine, indigoid, arylmethane, nitro, and nitroso groups.

[0018] In some embodiments of the present invention, the dichroic dye molecules are selected from the group consisting of ouzo and anthraquinone series.

[0019] In the present invention, the dichroic dye exhibits different absorption characteristics in the visible spectrum according to the structure, a single dichroic dye mainly absorbs light of a certain wavelength, and the displayed color is the complementary color of all transmitted light, and it is difficult to realize black with a single dye, so it is necessary to mix multiple dyes to absorb light of multiple wavelengths, and achieve uniform absorption in the visible light band according to the sensitivity of the human eye to light, which is called black. For the liquid crystal light control device containing a dichroic dye, the more uniform the absorption of the liquid crystal composition for light of different wavelengths in the visible light band, the more uniform the distribution of the transmittance curve, and the higher the display effect of the display device, so it is necessary to select an appropriate ratio in the combination of multiple dichroic dyes, which will provide excellent chromaticity reproducibility, and when the liquid crystal composition has high compatibility with the dye, the higher the content of the dichroic dye that can be added, the higher the contrast.

[0020] In some embodiments of the present invention, the dichroic dye molecule is selected from the group consisting of the following compounds: [ka] [ka] [ka]

[0021] In some embodiments of the present invention, the weight percentage of the dichroic dye in the liquid crystal composition is 0.01% to 10% (including any numerical value or subrange therein), for example, 0.1%, 0.5%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8%, 10%, or a range between any two of these numerical values, and preferably 1% to 6%.

[0022] In some embodiments of the present invention, the dichroic dye molecule is one or a combination of at least two dyes selected from dye No. 5 to dye No. 35, and preferably one or a combination of at least two dyes selected from dye No. 5 to dye No. 22.

[0023] In some embodiments of the present invention, the purple dye is one or a combination of at least two dyes selected from dye number 5 to dye number 9.

[0024] In some embodiments of the present invention, the orange dye is one or a combination of at least two dyes selected from dye number 10 to dye number 16.

[0025] In some embodiments of the present invention, the blue dye is one or a combination of at least two dyes selected from dye number 17 to dye number 35, and preferably one or a combination of at least two dyes selected from dye number 17 to dye number 22.

[0026] 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, R M1 and R M2 each independently represents a linear or branched alkyl group containing 1 to 12 carbon atoms; [ka] in which one or two or more non-adjacent -CH2- groups in a linear or branched alkyl group containing 1 to 12 carbon atoms may each be 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 more single bonds in the ring may be replaced by a double bond; [ka] 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 If =2, [ka] may be the same or different, Z M2 may be the same or different.

[0027] The alkenyl group in the present invention is preferably selected from the groups represented by any one of formulas (V1) to (V9), and particularly preferably selected from the groups represented by formulas (V1), (V2), (V8) and (V9). The groups represented by formulas (V1) to (V9) are [ka] and In the formula, * represents a carbon atom in the attached ring structure.

[0028] The alkenyloxy group of the present invention is preferably selected from groups represented by any one of formulas (OV1) to (OV9), and particularly preferably selected from groups represented by formulas (OV1), (OV2), (OV8) and (OV9). The groups represented by formulas (OV1) to (OV9) are: [ka] and In the formula, * represents a carbon atom in the attached ring structure.

[0029] In some embodiments of the present invention, the compound of general formula M is [ka] [ka] [ka] is selected from the group consisting of compounds In the formula, R M1 and R M2 has the same definition as in general formula M.

[0030] In some embodiments of the present invention, the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1% to 60% (including any numerical value or subrange therein), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, 32%, 34%, 35%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, or a range between any two numerical values ​​therein, and preferably, the weight percentage of the compound of general formula M in the liquid crystal composition is 1% to 50%.

[0031] In some embodiments of the present invention, in order to obtain high display effect and effectively avoid the problems of display unevenness and burn-in, the compound of general formula M is a compound selected from the group consisting of compounds of general formula M-1, compounds of general formula M-2, compounds of general formula M-12, compounds of general formula M-16, compounds of general formula M-26, compounds of general formula M-27, compounds of general formula M-28, compounds of general formula M-29, compounds of general formula M-30, compounds of general formula M-31, compounds of general formula M-32, and compounds of general formula M-33.

[0032] In some embodiments of the present invention, in order to obtain a higher display effect (higher VHR (initial), higher VHR (Ra) and wider temperature usage range) and effectively avoid the problems of display unevenness and burn-in, the compound of general formula M includes at least one compound selected from the group consisting of the compound of general formula M-26, the compound of general formula M-27, the compound of general formula M-28, the compound of general formula M-29, the compound of general formula M-30, the compound of general formula M-31, the compound of general formula M-32 and the compound of general formula M-33.

[0033] In some embodiments of the present invention, R M1 and R M2 are preferably each independently a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms; R M1 and R M2 are more preferably each independently a linear or branched alkyl group containing 1 to 8 carbon atoms, a linear or branched alkoxy group containing 1 to 7 carbon atoms, or a linear or branched alkenyl group containing 2 to 8 carbon atoms; R M1 and R M2 are even more preferably each independently a straight-chain or branched-chain alkyl group containing 1 to 5 carbon atoms, a straight-chain or branched-chain alkoxy group containing 1 to 4 carbon atoms, or a straight-chain or branched-chain alkenyl group containing 2 to 5 carbon atoms.

[0034] In some embodiments of the present invention, R M1 and R M2 are preferably each independently a straight-chain alkenyl group containing 2 to 8 carbon atoms, and more preferably each independently a straight-chain alkenyl group containing 2 to 5 carbon atoms.

[0035] In some embodiments of the present invention, preferably, R M1 and R M2 One of these is a linear alkenyl group containing 2 to 5 carbon atoms, and the other is a linear alkyl group containing 1 to 5 carbon atoms.

[0036] In some embodiments of the present invention, R M1 and R M2 are preferably each independently a linear alkyl group containing 1 to 8 carbon atoms or a linear alkoxy group containing 1 to 7 carbon atoms, and more preferably each independently a linear alkyl group containing 1 to 5 carbon atoms or a linear alkoxy group containing 1 to 4 carbon atoms.

[0037] In some embodiments of the present invention, preferably, R M1 and R M2 one of which is a linear alkyl group containing 1 to 5 carbon atoms, and the other is a linear alkyl group containing 1 to 5 carbon atoms or a linear alkoxy group containing 1 to 4 carbon atoms, and more preferably R M1 and R M2 are each independently a straight chain alkyl group containing 1 to 5 carbon atoms.

[0038] In some embodiments of the present invention, when reliability is important, preferably, R M1 and R M2 are both alkyl groups, and when emphasis is placed on reducing the volatility of the compound, preferably, R M1 and R M2are both alkoxy groups, and when a reduction in viscosity is important, R M1 and R M2 At least one of the groups is an alkenyl group.

[0039] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula A-1 and / or general formula A-2, [ka] During the ceremony, R A1 and R A2 each independently represents a linear or branched alkyl group containing 1 to 12 carbon atoms; [ka] one or two or more non-adjacent -CH2- groups in the linear or branched alkyl group containing 1 to 12 carbon atoms may be each independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; [ka] one or more -H in each independently may 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 more single bonds in the ring may be replaced by a double bond; [ka] one or more -H in the ring may be independently replaced by -F, -Cl or -CN, and one or more -CH= in the ring may be independently replaced by -N=; Z A11 , Z A21 and Z A22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-, L A11 , L A12 , L A13 , L A21 and L A22 each independently represents -H, an alkyl group having 1 to 3 carbon atoms, or a halogen; X A1 and X A2 each independently represents a halogen, a halogenated alkyl group or a halogenated alkoxy group containing 1 to 5 carbon atoms, or a halogenated alkenyl group or a halogenated alkenyloxy group containing 2 to 5 carbon atoms; n A11 represents 0, 1, 2 or 3; n A11 = 2 or 3, [ka] may be the same or different, Z A11 may be the same or different, n A12 represents 1 or 2, n A12 If =2, [ka] may be the same or different, n A2 represents 0, 1, 2 or 3; n A2 = 2 or 3, [ka] may be the same or different, Z A21may be the same or different.

[0040] In some embodiments of the present invention, the weight percentage of at least one compound of general formula A-1 and / or general formula A-2 in the liquid crystal composition is 0.1% to 60% (including any numerical value or subrange therein), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, 32%, 34%, 35%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, or a range between any two numerical values ​​therein.

[0041] In some embodiments of the present invention, the compound of formula A-1 is [ka] [ka] is selected from the group consisting of compounds During the ceremony, R A1 represents a linear or branched alkyl group containing 1 to 8 carbon atoms, one or two or more non-adjacent -CH2- groups in the linear or branched alkyl group containing 1 to 8 carbon atoms may each be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H groups in the linear or branched alkyl group containing 1 to 8 carbon atoms may each be independently replaced by -F or -Cl; R v and R w each independently represents -CH2- or -O-; L A11 , L A12 , L A11 ', L A12 ', L A14 , L A15 and L A16 each independently represents -H or -F; L A13 and L A13 ' each independently represents -H or -CH3; X A1 represents -F, -CF3 or -OCF3, v and w each independently represent 0 or 1.

[0042] In some embodiments of the present invention, the weight percentage of the compound of general formula A-1 in the liquid crystal composition is 0.1% to 50% (including any numerical value or subrange therein), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, 32%, 34%, 35%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, or a range between any two numerical values ​​therein.

[0043] In some embodiments of the present invention, the compound of formula A-2 is [ka] [ka] is selected from the group consisting of compounds During the ceremony, R A2 represents a linear or branched alkyl group containing 1 to 8 carbon atoms, one or two or more non-adjacent -CH2- groups in the linear or branched alkyl group containing 1 to 8 carbon atoms may each be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H groups in the linear or branched alkyl group containing 1 to 8 carbon atoms may each be independently replaced by -F or -Cl; L A21 , L A22 , L A23 , L A24 and L A25 each independently represents -H or -F; XA2 represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0044] In some embodiments of the present invention, the weight percentage of the compound of general formula A-2 in the liquid crystal composition is 0.1% to 50% (including any numerical value or subrange therein), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, 32%, 34%, 35%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 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 F, [ka] During the ceremony, R F1 and R F2 are each independently -H, a halogen, or a linear or branched alkyl group containing 1 to 12 carbon atoms; [ka] represents a linear or branched alkyl group having 1 to 12 carbon atoms; [ka] one or two or more non-adjacent -CH2- in the alkyl group may be each independently replaced by -C≡C-, -O-, -S-, -CO-, -CO-O- or -O-CO-; one or more -H in the linear or branched alkyl group containing 1 to 12 carbon atoms 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 more single bonds in the ring may be replaced by a double bond; [ka] one or more -H in each ring may be independently replaced by -CN, -F, or -Cl, and one or more -CH= in the ring may be replaced by -N=; X F represents -O-, -S- or -CO-; L F1 and L F2 each independently represents -H, -F, -Cl, -CF3, or -OCF3; Z F1 and Z F2 each independently represents a single bond, -O-, -CO-O-, -O-CO-, -CHO-, -OCH-, -CH=CH-, -C≡C-, -CHCH-, -CFCF-, -(CH)-, -CFO-, or -OCF-, n F1 and n F2 Each independently represents 0, 1 or 2; n F1 If represents 2, then [ka] may be the same or different, n F2 If represents 2, then [ka] may be the same or different, Z F2 may be the same or different, n F4 represents an integer from 0 to 4.

[0046] In some embodiments of the present invention, the compound of general formula F is [ka] [ka] [ka] is selected from the group consisting of compounds During the ceremony, R F2 ' represents a linear or branched alkoxy group containing 1 to 11 carbon atoms; X F1 and X F2 each independently represents -CH2- or -O-; n F3 represents an integer from 1 to 5 (e.g., 1, 2, 3, 4, or 5), R F3 represents a linear or branched alkyl group containing 1 to 5 carbon atoms, a linear or branched alkoxy group containing 1 to 4 carbon atoms, or a linear or branched alkenyl group containing 2 to 5 carbon atoms.

[0047] In some embodiments of the present invention, the weight percentage of the compound of general formula F in the liquid crystal composition is 0.1% to 30% (including any numerical value or subrange therein), for example, 0.1%, 0.5%, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, or a range between any two numerical values ​​therein.

[0048] In some embodiments of the present invention, the liquid crystal composition further comprises at least one polymerizable compound of the general formula RM, [ka] During the ceremony, [ka] are each independently [ka] represents [ka] one or more -CH2- in the ring may be replaced by -O-, and one or more single bonds in the ring may be replaced by a double bond; [ka] one or more -H are each independently -F, -Cl, -CN, -Sp3-P3, a halogenated or non-halogenated linear alkyl group containing 1 to 12 carbon atoms, a halogenated or non-halogenated linear alkoxy group containing 1 to 11 carbon atoms, [ka] and one or more -CH= in the ring may be replaced by -N=; [ka] teeth, [ka] represents [ka] one or more -H are each independently -F, -Cl, -CN, -Sp3-P3, a halogenated or non-halogenated linear alkyl group containing 1 to 12 carbon atoms, a halogenated or non-halogenated linear alkoxy group containing 1 to 11 carbon atoms, [ka] and one or more -CH= in the ring may be replaced by -N=; R1 is -H, halogen, -CN, -Sp2-P2, or a linear or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; [ka] represents a linear or branched alkyl group having 1 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; P1, P2, and P3 each independently represent a polymerizable group. Sp1, Sp2, and Sp3 each independently represent a spacer group or a single bond; X0 represents -O-, -S- or -CO-; Z1 and Z2 each independently represent -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CHO-, -OCH-, -CHS-, -SCH-, -CFO-, -OCF-, -CFS-, -SCF-, -(CH) d -, -CF2CH2-, -CH2CF2-, -(CF2) d -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CHR 1 -, -CR 1 R 2 - or a single bond, R 1 and R 2 each independently represents a linear or branched alkyl group containing 1 to 12 carbon atoms; d represents an integer of 1 to 4; a represents 0, 1 or 2; b represents 0 or 1; when a represents 2, [ka] may be the same or different, and Z1 may be the same or different.

[0049] In some embodiments of the present invention, a polymerizable compound of the general formula RM is [ka] [ka] [ka] is selected from the group consisting of compounds During the ceremony, X1~X 10 and X 12 each independently represents -F, -Cl, -Sp3-P3, a linear alkyl group or an alkoxy group containing 1 to 5 carbon atoms; [ka] Represents.

[0050] In some embodiments of the present invention, X1 to X 10 and X 12 each independently represents -F, -Cl, -Sp3-P3, -CH3 or -OCH3.

[0051] In some embodiments of the invention, Sp1 and Sp2 both represent a single bond.

[0052] Polymerizable groups according to the present invention are groups which are applicable to polymerization reactions (for example radical or ionic polymerization, addition polymerization or condensation polymerization) or to addition or condensation in the polymer backbone. For chain polymerization, polymerizable groups containing -CH=CH- or -C≡C- are particularly preferred, and for ring-opening polymerization, for example, oxetanyl or epoxy groups are particularly preferred.

[0053] In some embodiments of the present invention, the polymerizable groups P1, P2, and P3 are each independently [ka] -SH, and preferably, the polymerizable groups P1, P2 and P3 each independently represent [ka] More preferably, the polymerizable groups P1, P2 and P3 each independently represent [ka] Represents.

[0054] 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-, -(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 from 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12), q1 represents an integer from 1 to 3 (e.g., 1, 2, or 3), R 0 and R 00 each independently represents -H, a straight or branched 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 R00 -(CH2) p1 -It is.

[0055] In some embodiments of the present invention, the weight percentage of the polymerizable compound of general formula RM in the liquid crystal composition is 0.001% to 5% (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%, 0.09%, 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%, 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%, 99%, 100%, 101%, 10 .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 those numbers.

[0056] In some embodiments of the present invention, the liquid crystal composition further comprises at least one self-aligning agent of general formula SA, [ka] During the ceremony, R S1 -Sp 1 -P 1 , a straight 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; [ka] one or two or more non-adjacent -CH2- groups in the linear or branched alkyl group containing 1 to 12 carbon atoms may be each independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; [ka] one or more -H in each may be independently replaced by -F or -Cl; [ka] teeth, [ka] represents [ka] one or more -CH2- in the ring may be replaced by -O-, and one or more single bonds in the ring may be replaced by a double bond; Ls1 and Ls3 each independently represent -F, -Cl, -CN, -NO2, -NCO, -NCS, -OCN, -SCN, -C(O)N(R S0 )2, -C(O)R S0 , a straight 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; [ka] one or two or more non-adjacent -CH2- groups in the linear or branched alkyl group containing 1 to 12 carbon atoms may be each independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; [ka] One or more -H in may each be independently replaced with -F, S0 represents a linear or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; Ls2 is -Sp 3 -P 2 Or, [ka] represents R S2and R S3 each independently represents an anchor group, [ka] where * represents the site of attachment in the attached structure; p represents 1 or 2, and when p represents 2, -Sp 8 -X 2 may be the same or different, o represents 0 or 1; M S1 teeth, [ka] represents I S1 and J S1 each independently represents -CH2-, -O-, or -S-; N S1 represents =O or =S, V K1 , V K2 and V K3 each independently represents -CH= or -N=; X 1 and X 2 are each independently -H, -OH, -SH, -NH2, or -NHR 11 , -N(R 11 )2, -NHC(O)R 11 , -OR 11 , -C(O)OH, -CHO, or a linear or branched, halogenated or non-halogenated alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; X 1 and X 2 At least one of the groups is -OH, -SH, -NH2, -NHR 11 , —C(O)OH, and —CHO; R 11 represents a linear or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; P 1 , P 2and P 3 each independently represents a polymerizable group, Sp 1 , Sp 2 , Sp 3 , Sp 4 , Sp 5 , Sp 7 , and Sp 8 each independently represents a spacer group or a single bond, Sp 6 are each independently [ka] represents Z 1 and Z 2 are each independently -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CHO-, -OCH-, -CHS-, -SCH-, -CFO-, -OCF-, -CFS-, -SCF-, -(CH) d -, -CF2CH2-, -CH2CF2-, -(CF2) d -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CHR 1 -, -CR 1 R 2 - or a single bond, R 1 and R 2 each independently represents a linear or branched alkyl group containing 1 to 12 carbon atoms; d represents an integer of 1 to 4; n s1 represents 1, 2 or 3; n s2 represents 1, 2, 3 or 4, and n s1 +n s2 ≧3, n s1 When represents 2 or 3, [ka] may be the same or different, n s2 represents 2, 3 or 4, [ka] may be the same or different, p s1 , p s2 , p s3 and p s4 Each independently represents 0, 1 or 2; p s1 When represents 2, Ls2 may be the same or different, and p s2 When represents 2, Ls1 may be the same or different, and p s3 If represents 2, then , -Sp 5 -R S3 may be the same or different, and p s4 When represents 2, Ls3 may be the same or different.

[0057] In some embodiments of the present invention, Ls2 is -Sp 3 -P 2 , [ka] Represents.

[0058] In some embodiments of the present invention, Sp 3 , Sp 4 , and Sp 5 are each independently -(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 -, where p1 represents an integer from 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12), R 0 and R 00each independently represents -H, a linear or branched 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, and preferably represents Sp 3 , Sp 4 , and Sp 5 each independently represents -(CH2)p1- or -(CH2)p1-O-.

[0059] In some embodiments of the present invention, the self-aligning agent of general formula SA is [ka] [ka] [ka] is selected from the group consisting of compounds During the ceremony, Ls 31 are -F, -Cl, -CN, -NO2, -NCO, -NCS, -OCN, -SCN, -C(O)N(R S0 )2, -C(O)R S0 , a straight 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; [ka] one or two or more non-adjacent -CH2- groups in the linear or branched alkyl group containing 1 to 12 carbon atoms may be each independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; [ka] One or more -H in may each be independently replaced with -F, S0 represents a linear or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; Ls 21 -Sp 3 -P 2 or [ka] represents Z 11 -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CH2O-, -OCH2-, -CH2S-, -SCH2-, -CF2O-, -OCF2-, -CF2S-, -SCF2-, -(CH2) 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 or branched alkyl group containing 1 to 12 carbon atoms; and d represents an integer of 1 to 4.

[0060] In some embodiments of the present invention, preferably, Ls1, Ls3 and Ls 31 are each independently -F, -Cl, -CN, -NO2, -NCO, -NCS, -OCN, -SCN, -C(O)N(R S0 )2, -C(O)R S0 , a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms, and more preferably Ls1, Ls3, and Ls4. 31each independently represents -F, -Cl, a linear or branched alkyl group containing 1 to 8 carbon atoms, a linear or branched alkoxy group containing 1 to 7 carbon atoms, or a linear or branched alkenyl group containing 2 to 8 carbon atoms.

[0061] In some embodiments of the present invention, preferably, R S1 -Sp 1 -P 1 , a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms, and more preferably R S1 represents a linear or branched alkyl group containing 1 to 8 carbon atoms, a linear or branched alkoxy group containing 1 to 7 carbon atoms, or a linear or branched alkenyl group containing 2 to 8 carbon atoms.

[0062] In some embodiments of the present invention, R S2 and R S3 are each independently -OH, -SH, -NH2, -NHR 11 , -N(R 11 )2, -NHC(O)R 11 , -OR 11 , -C(O)OH, [ka] or -X 1 Represents.

[0063] In some embodiments of the present invention, R S2 and R S3 are each independently [ka] is selected from the group consisting of the groups During the ceremony, * denotes the binding site in the bound structure.

[0064] In some embodiments of the present invention, R S2 and R S3 are each independently [ka] is selected from the group consisting of the groups:

[0065] Furthermore, R S2 and R S3 are each independently preferably [ka] It is.

[0066] In some embodiments of the present invention, p s1 represents 1 or 2.

[0067] In some embodiments of the present invention, the weight percentage of the self-aligning agent of general formula SA in the liquid crystal composition is 0.001% to 5% (including any numerical value or subrange therein), for example, 0.001%, 0.005%, 0.05%, 0.1%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1.0%, 2%, 3%, 4%, 5%, or a range between any two numerical values ​​therein, and preferably, the weight percentage of the self-aligning agent of general formula SA in the liquid crystal composition is 0.1% to 2%.

[0068] In the present invention, when the self-aligning agent of the general formula SA is added to the liquid crystal composition, the liquid crystal composition of the present invention can align liquid crystal molecules without providing a PI alignment layer.

[0069] In some embodiments of the present invention, the weight percentage of the chiral dopant in the liquid crystal composition is 0.01% to 10% (including any numerical value or subrange therein), for example, 0.01%, 0.1%, 0.2%, 0.4%, 0.5%, 0.6%, 0.66%, 0.7%, 0.72%, 0.1%, 1%, 1.1%, 1.14%, 1.2%, 1.25%, 1.3%, 1.36%, 1.5%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.2%, 8.5%, 9%, 9.5%, 10%, or a range between any two numerical values ​​therein, and preferably 0.1% to 3%.

[0070] In some embodiments of the invention, the chiral agent is an S-chiral compound or an R-chiral compound.

[0071] In some embodiments of the invention, the S-chiral compound is selected from the group consisting of S1011, S2011, S5011, S811, and S6N chiral agents, and the R-chiral compound is selected from the group consisting of R1011, R2011, R5011, R811, and R6N chiral agents.

[0072] In some embodiments of the invention, the chiral agent is selected from the group consisting of S1011, S2011, and S811.

[0073] In some embodiments of the invention, the HTP value of the chiral agent is ≧5 (e.g., ≧6, ≧7, ≧7, ≧8, ≧9, ≧10, ≧11).

[0074] The liquid crystal composition of the present invention may contain, in addition to the above compounds, a general nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, an antioxidant, an ultraviolet absorber, an infrared absorber, a photoinitiator, a polymerizable monomer, or a light stabilizer.

[0075] In some embodiments of the present invention, the liquid crystal composition further comprises a dopant, the dopant being [ka] It is.

[0076] In some embodiments of the present invention, the weight percentage of the dopant in the liquid crystal composition is 0% to 5%, for example, 0.3%, 0.5%, 1%, 2%, 3%, 4% or 5%, and preferably the weight percentage of the dopant in the liquid crystal composition is 0.01% to 1%.

[0077] The additives such as antioxidants and light stabilizers used in the liquid crystal composition of the present invention are preferably the following substances. [ka] [ka] [ka] In the formula, n represents a positive integer of 1 to 12.

[0078] Preferably, the antioxidant is selected from the light stabilizers listed below. [ka] In some embodiments of the present invention, the total weight percentage of the additives in the liquid crystal composition is 0% to 5%, for example, 0.3%, 0.5%, 1%, 2%, 3%, 4% or 5%, and preferably the total weight percentage of the additives in the liquid crystal composition is 0.01% to 1%, for example, 0.01%, 0.05%, 0.08%, 0.1%, 0.5%, 0.8% or 1%.

[0079] In some embodiments of the present invention, the liquid crystal composition of the present invention comprises a photoinitiator as shown below. [ka] The liquid crystal light control device according to the present invention can be applied to the fields of architecture and transportation. Effect of the Invention

[0080] Compared with the prior art, the present invention has the following beneficial effects:

[0081] The liquid crystal light control device of the present invention has an appropriate transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra), and wide temperature range. The light control device of the present invention has a high display effect at the moment the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Brief description of the drawings]

[0082] [Figure 1] 1 is a photograph of the surface of the liquid crystal light modulating device of Example 1 at the moment when the device is turned off after being energized for 2 hours. [Diagram 2] 1 is a photograph of the surface of the liquid crystal light modulating device of Comparative Example 1 at the moment when the device is turned off after being energized for two hours. [Diagram 3] 1 is a photograph of the surface of the liquid crystal light modulating device of Example 2 at the moment when the device is turned off after being energized for 2 hours. [Figure 4] 1 is a photograph of the surface of the liquid crystal light modulating device of Comparative Example 2 at the moment when the power is turned off after being energized for two hours. [Diagram 5] 1 is a photograph of the surface of the liquid crystal light modulating device of Example 3 at the moment when the device is turned off after being energized for 2 hours. [Figure 6] 1 is a photograph of the surface of the liquid crystal light modulating device of Comparative Example 3 at the moment when the device is turned off after being energized for 2 hours. [Figure 7] 1 is a photograph of the surface of the liquid crystal light modulating device of Example 4 at the moment when the device is turned off after being energized for 2 hours. [Figure 8] 1 is a photograph of the surface of the liquid crystal light modulating device of Comparative Example 4 at the moment when the power is turned off after being energized for 2 hours. [Figure 9] 1 is a photograph of the surface of the liquid crystal light modulating device of Example 5 at the moment when the device is turned off after being energized for 2 hours. [Figure 10]1 is a photograph of the surface of the liquid crystal light modulating device of Comparative Example 5 at the moment when the power is turned off after being energized for 2 hours. [Figure 11] 1 is a photograph of the surface of the liquid crystal light modulating device of Example 6 at the moment when the power is turned off after being energized for 2 hours. [Figure 12] 1 is a photograph of the surface of the liquid crystal light modulating device of Comparative Example 6 at the moment when the power is turned off after being energized for 2 hours. [Figure 13] 1 is a photograph of the surface of the liquid crystal light modulating device of Example 7 at the moment when the power is turned off after being energized for 2 hours. [Figure 14] 1 is a photograph of the surface of the liquid crystal light modulating device of Comparative Example 7 at the moment when the power is turned off after being energized for 2 hours. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0083] The technical means of the present invention will be further described below by specific embodiments. Those skilled in the art should understand that the above examples are only for understanding the present invention, and should not be regarded as specifically limiting the present 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 only intended to explain the present invention, and are not intended 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] For ease of explanation, in each of the following examples, the radical structures of each compound are represented by the codes shown in Table 1.

[0086] [Table 1]

[0087] Take the compound of the following structural formula as an example: [ka] When the structural formula is represented by the code shown in Table 1, it can be represented as nCCGF, where n in the code represents the number of C atoms in the alkyl group at the left end. For example, when n is "3", it represents that the alkyl group is -C3H7, C in the code represents a 1,4-cyclohexylene group, G represents a 2-fluoro-1,4-phenylene group, and F represents fluorine.

[0088] 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, 25℃) Δε Dielectric constant anisotropy (1KHz, 25℃) T c Low-temperature storage phase transition point (i.e., nematic phase minimum temperature, °C) VHR (initial) Initial voltage retention rate (%) VHR(Ra) Voltage retention rate (%) after 500 hours at 85℃ t -30℃ Low temperature storage time (h, -30℃) T r0 Off-state transmittance (25℃, %) T r255 On-state transmittance (25℃, %) CR contrast (25℃) During the ceremony, Cp: ​​Obtained by measurement using a melting point measuring apparatus.

[0089] Δn:Δn=n e -n0, measured at 25°C using an Abbe refractometer under a sodium lamp (589 nm) light source.

[0090] Δε:Δε=ε ll -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 25°C, 1KHz, and a VA-type measurement cell with a cell thickness of 6μm.

[0091] Tc Nematic phase liquid crystal material is placed in a glass bottle and stored in a refrigerator at temperatures of 0℃, -10℃, -20℃, -30℃, and -40℃, respectively. The low-temperature conditions are observed on the 10th day. For example, if the sample exhibits a nematic phase at -20℃ and a crystalline or smectic state at -30℃, then T c is <-20℃.

[0092] VHR (initial, 25° C.): Initial voltage holding ratio, obtained by measurement using a TOY06254 type liquid crystal physical property evaluation system, the measurement temperature is 25° C., the measurement voltage is 5 V, and the measurement frequency is 6 Hz.

[0093] VHR (initial, 60° C.): Initial voltage holding ratio, measured using a TOY06254 liquid crystal physical property evaluation system, at a measurement temperature of 60° C., a measurement voltage of 5 V, and a measurement frequency of 6 Hz.

[0094] VHR (Ra, 25°C): Obtained by measurement using a TOY06254 type liquid crystal physical property evaluation system, and measured after the liquid crystal was kept at a high temperature of 85°C for 500 hours, the measurement temperature was 25°C, the measurement voltage was 5V, and the measurement frequency was 6Hz.

[0095] VHR (Ra, 60°C): Obtained by measurement using a TOY06254 type liquid crystal physical property evaluation system, measured after the liquid crystal was kept at a high temperature of 85°C for 500 hours, the measurement temperature was 60°C, the measurement voltage was 5V, and the measurement frequency was 6Hz.

[0096] t -30℃ The time when a nematic liquid crystal medium is placed in a glass bottle and stored at -30°C, and the precipitation of crystals is observed is recorded.

[0097] Using the CR:DMS 505 measuring instrument, the transmittance of the liquid crystal cell was measured at 255 grayscale voltage and 0 grayscale voltage, i.e., T r255 and T r0 Measure T r255 / T r0 is obtained from.

[0098] 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 have been measured to meet the standards of electronic compounds.

[0099] A liquid crystal composition is prepared according to the blending ratio of each liquid crystal compound specified in the following examples. The liquid crystal composition is prepared by a general method in this field, for example, by mixing according to the ratio using a method such as heating, ultrasonic wave, suspension, etc. [Example 1]

[0100] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0101] Liquid crystal composition 1 was prepared according to each compound and their weight percentages shown in Table 2, a dye was added to liquid crystal composition 1 at a weight percentage of 3.8% relative to the liquid crystal composition, and chiral agent S811 was added to liquid crystal composition 1 at a weight percentage of 1.14% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured. The measurement results are shown in Table 3.

[0102] [Table 2]

[0103] [Table 3]

[0104] FIG. 1 shows the surface of the liquid crystal light modulating device of Example 1 at the moment when the power is turned off after being energized for 2 hours. [Comparative Example 1]

[0105] The only difference between this Comparative Example 1 and Example 1 is that the orientation directions of the upper and lower alignment layers are antiparallel. Table 4 shows the results after the performance measurements were carried out.

[0106] [Table 4]

[0107] FIG. 2 shows the surface of the liquid crystal light modulating device of Comparative Example 1 at the moment when the power is turned off after being energized for 2 hours.

[0108] As can be seen from the comparison between Comparative Example 1 and Example 1, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra) and wide temperature range. As can be seen from the comparison of Fig. 2 with Fig. 1, the light control device of the present invention has a high display effect at the moment when the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Example 2]

[0109] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0110] Liquid crystal composition 1 was prepared according to each compound and their weight percentages shown in Table 2, a dye was added to liquid crystal composition 1 at a weight percentage of 3% relative to the liquid crystal composition, and chiral agent S811 was added to liquid crystal composition 1 at a weight percentage of 1.36% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 5.

[0111] [Table 5]

[0112] FIG. 3 shows the surface of the liquid crystal light modulating device of Example 2 at the moment when the power is turned off after being energized for 2 hours. [Comparative Example 2]

[0113] The only difference between Comparative Example 2 and Example 2 is that the orientation directions of the upper and lower alignment layers are antiparallel.

[0114] After performance measurements were carried out, the results are shown in Table 6.

[0115] [Table 6]

[0116] FIG. 4 shows the surface of the liquid crystal light modulating device of Comparative Example 2 at the moment when the power was turned off after being energized for 2 hours.

[0117] As can be seen from the comparison between Comparative Example 2 and Example 2, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra) and wide temperature range. As can be seen from the comparison of Fig. 4 and Fig. 3, the light control device of the present invention has a high display effect at the moment when the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Example 3]

[0118] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0119] Liquid crystal composition 2 was prepared according to each compound and their weight percentages shown in Table 7, a dye was added to liquid crystal composition 2 at a weight percentage of 4% relative to the liquid crystal composition, and chiral agent S811 was added to liquid crystal composition 2 at a weight percentage of 1.1% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 8.

[0120] [Table 7]

[0121] [Table 8]

[0122] FIG. 5 shows the surface of the liquid crystal light modulating device of Example 3 at the moment when the power is turned off after being energized for 2 hours. [Comparative Example 3]

[0123] The only difference between Comparative Example 3 and Example 3 is that the orientation directions of the upper and lower alignment layers are antiparallel.

[0124] After performance measurements were performed, the results are shown in Table 9.

[0125] [Table 9]

[0126] FIG. 6 shows the surface of the liquid crystal light modulating device of Comparative Example 3 at the moment when the power was turned off after being energized for 2 hours.

[0127] As can be seen from the comparison between Comparative Example 3 and Example 3, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255), suitable contrast, high VHR (initial), high VHR (Ra) and wide temperature range. As can be seen from the comparison between Fig. 6 and Fig. 5, the light control device of the present invention has a high display effect at the moment when the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Example 4]

[0128] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0129] Liquid crystal composition 2 was prepared according to each compound and their weight percentages shown in Table 7, a dye was added to liquid crystal composition 2 at a weight percentage of 3.6% relative to the liquid crystal composition, and chiral agent S1011 was added to liquid crystal composition 2 at a weight percentage of 0.72% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 10.

[0130] [Table 10]

[0131] FIG. 7 shows the surface of the liquid crystal light modulating device of Example 4 at the moment when the power is turned off after being energized for 2 hours. [Comparative Example 4]

[0132] The only difference between Comparative Example 4 and Example 4 is that the orientation directions of the upper and lower alignment layers are antiparallel.

[0133] After performance measurements were performed, the results are shown in Table 11.

[0134] [Table 11]

[0135] FIG. 8 shows the surface of the liquid crystal light modulating device of Comparative Example 4 at the moment when the power was turned off after being energized for 2 hours.

[0136] As can be seen from the comparison between Comparative Example 4 and Example 4, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra) and wide temperature range. As can be seen from the comparison of Fig. 8 and Fig. 7, the light control device of the present invention has a high display effect at the moment when the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Example 5]

[0137] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0138] Liquid crystal composition 3 was prepared according to each compound and their weight percentages shown in Table 12, a dye was added to liquid crystal composition 3 at a weight percentage of 3% relative to the liquid crystal composition, and chiral agent S811 was added to liquid crystal composition 3 at a weight percentage of 1.3% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 13.

[0139] [Table 12]

[0140] [Table 13]

[0141] FIG. 9 shows the surface of the liquid crystal light modulating device of Example 5 at the moment when the power is turned off after being energized for 2 hours. [Comparative Example 5]

[0142] The present Comparative Example 5 differs from Example 5 only in that the orientation directions of the upper and lower orientation layers are antiparallel.

[0143] After performance measurements were performed, the results are shown in Table 14.

[0144] [Table 14]

[0145] FIG. 10 shows the surface of the liquid crystal light modulating device of Comparative Example 5 at the moment when the power was turned off after being energized for 2 hours.

[0146] As can be seen from the comparison between Comparative Example 5 and Example 5, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, a suitable optical anisotropy, a suitable absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has a suitable transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra) and wide temperature range. As can be seen from the comparison between Fig. 10 and Fig. 9, the light control device of the present invention has a high display effect at the moment when the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Example 6]

[0147] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0148] Liquid crystal composition 3 was prepared according to each compound and their weight percentage shown in Table 12, a dye was added to liquid crystal composition 3 at a weight percentage of 3.8% relative to the liquid crystal composition, and chiral agent S1011 was added to liquid crystal composition 3 at a weight percentage of 1.25% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 15.

[0149] [Table 15]

[0150] FIG. 11 shows the surface of the liquid crystal light modulating device of Example 6 at the moment when the power is turned off after being energized for 2 hours. [Comparative Example 6]

[0151] The only difference between Comparative Example 6 and Example 6 is that the orientation directions of the upper and lower alignment layers are antiparallel.

[0152] After performance measurements were performed, the results are shown in Table 16.

[0153] [Table 16]

[0154] FIG. 12 shows the surface of the liquid crystal light modulating device of Comparative Example 6 at the moment when the power was turned off after being energized for 2 hours.

[0155] As can be seen from the comparison between Comparative Example 6 and Example 6, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255), suitable contrast, high VHR (initial), high VHR (Ra) and wide temperature range. As can be seen from the comparison between Fig. 12 and Fig. 11, the light control device of the present invention has a high display effect at the moment when the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Example 7]

[0156] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0157] Liquid crystal composition 3 was prepared according to each compound and their weight percentage shown in Table 12, a dye was added to liquid crystal composition 3 at a weight percentage of 3.8% relative to the liquid crystal composition, and chiral agent S2011 was added to liquid crystal composition 3 at a weight percentage of 0.66% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 17.

[0158] [Table 17]

[0159] FIG. 13 shows the surface of the liquid crystal light modulating device of Example 7 at the moment when the power is turned off after being energized for 2 hours. [Comparative Example 7]

[0160] The only difference between Comparative Example 6 and Example 6 is that the orientation directions of the upper and lower alignment layers are antiparallel.

[0161] After performance measurements were performed, the results are shown in Table 18.

[0162] [Table 18]

[0163] FIG. 14 shows the surface of the liquid crystal light modulating device of Comparative Example 7 at the moment when the power was turned off after being energized for 2 hours.

[0164] As can be seen from the comparison between Comparative Example 7 and Example 7, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra) and wide temperature range. As can be seen from the comparison between Fig. 14 and Fig. 13, the light control device of the present invention has a high display effect at the moment when the power is turned off after two hours of power supply, and can effectively avoid the problems of display unevenness and burn-in. [Example 8]

[0165] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0166] Liquid crystal composition 4 was prepared according to each compound and their weight percentages shown in Table 19, a dye was added to liquid crystal composition 4 at a weight percentage of 3.8% relative to the liquid crystal composition, and chiral agent S811 was added to liquid crystal composition 4 at a weight percentage of 1.14% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 20.

[0167] [Table 19]

[0168] [Table 20] [Comparative Example 8]

[0169] The only difference between this Comparative Example 8 and Example 8 is that the orientation directions of the upper and lower alignment layers are antiparallel. Table 21 shows the results after the performance measurements were carried out.

[0170] [Table 21]

[0171] As can be seen from the comparison between Comparative Example 8 and Example 8, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, a suitable optical anisotropy, a suitable absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has a suitable transmittance (T r0 , T r255 ), suitable contrast, high VHR (initial), high VHR (Ra) and a wide temperature range, which can effectively avoid the problems of uneven display and burn-in. [Example 9]

[0172] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0173] Liquid crystal composition 4 was prepared according to each compound and their weight percentage shown in Table 22, a dye was added to liquid crystal composition 4 at a weight percentage of 4% relative to the liquid crystal composition, and chiral agent S811 was added to liquid crystal composition 4 at a weight percentage of 1.1% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 23.

[0174] [Table 22]

[0175] [Table 23] [Comparative Example 9]

[0176] Comparative Example 9 differs from Example 9 only in that the orientation directions of the upper and lower orientation layers are antiparallel.

[0177] After performance measurements were performed, the results are shown in Table 24.

[0178] [Table 24]

[0179] As can be seen from the comparison between Comparative Example 9 and Example 9, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255 ), adequate contrast, high VHR (initial), high VHR (Ra) and a wide temperature range. [Example 10]

[0180] The liquid crystal dimming device of this embodiment includes, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate, and the alignment directions of the upper alignment layer and the lower alignment layer are parallel.

[0181] Liquid crystal composition 4 was prepared according to each compound and their weight percentages shown in Table 7, a dye was added to liquid crystal composition 4 at a weight percentage of 3.6% relative to the liquid crystal composition, and chiral agent S1011 was added to liquid crystal composition 4 at a weight percentage of 0.72% relative to the liquid crystal composition, which was then filled into the guest-host liquid crystal composition layer of this embodiment, and the performance of the liquid crystal dimming device was measured, and the measurement results are shown in Table 25.

[0182] [Table 25] [Comparative Example 10]

[0183] The only difference between Comparative Example 10 and Example 10 is that the orientation directions of the upper and lower orientation layers are antiparallel.

[0184] After performance measurements were performed, the results are shown in Table 26.

[0185] [Table 26]

[0186] As can be seen from the comparison between Comparative Example 10 and Example 10, by filling the liquid crystal light modulating device of the present invention with a liquid crystal composition, chiral agent, or dye having a high clearing point, appropriate optical anisotropy, appropriate absolute value of dielectric anisotropy, and good low-temperature storage stability, the liquid crystal light modulating device of the present invention has an appropriate transmittance (T r0 , T r255 ), adequate contrast, high VHR (initial), high VHR (Ra) and a wide temperature range.

[0187] From the above, the liquid crystal light control device of the present invention has an appropriate transmittance (T r0 is 12.6-21.4, and T r255 is 53.4-64.2), appropriate contrast (3-4.5), high VHR(initial) (VHR(initial, 25°C) is 84 or more, and VHR(initial, 60°C) is 55 or more), high VHR(Ra) (VHR(Ra, 25°C) is 62 or more, and VHR(Ra, 60°C) is 14 or more, and even reaches 23 or more), and a wide temperature range (low temperature storage phase transition point ≧-30°C). The light control device of the present invention has a high display effect at the moment of turning off the power after being energized for 2 hours, and can effectively avoid the problems of display unevenness and burn-in.

[0188] The applicant claims that the present invention describes the liquid crystal light control device of the present invention through the above embodiment, but the present invention is not limited to the above embodiment, that is, it does not mean that the present invention cannot be implemented without relying on the above embodiment. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of raw materials used in the present invention, addition of auxiliary components, selection of specific methods, etc. are all within the protection scope and disclosure scope of the present invention. [Industrial Applicability]

[0189] The liquid crystal light control device according to the present invention can be applied to the fields of architecture and transportation.

Claims

1. From bottom to top, the layer includes a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate; The orientation directions of the upper alignment layer and the lower alignment layer are parallel orientations, The guest-host liquid crystal composition layer comprises at least one dichroic dye, at least one chiral agent, and at least one liquid crystal composition; The liquid crystal composition comprises at least one liquid crystal compound represented by general formula N, 【Chemistry 1】 During the ceremony, R Ｎ１ and R Ｎ２ are each independently a straight or branched chain alkyl group containing 1 to 12 carbon atoms; 【Chemistry 2】 represents one or two or more non-adjacent —CH ２ Each - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 3】 are each independently 【Chemistry 4】 represents 【Chemistry 5】 At least one -CH ２ - may be replaced by -O-, and one or more single bonds in the ring may be replaced by a double bond; 【Chemistry 6】 one or more -H in the ring may be independently replaced by -F, -Cl or -CN, and one or more -CH= in the ring may be replaced by -N=; 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 L Ｎ１ and L Ｎ２ each independently represents -H, a halogen, an alkyl group containing 1 to 3 carbon atoms, or an alkoxy group containing 1 to 3 carbon atoms; n Ｎ１ represents 0, 1, 2 or 3; n Ｎ２ represents 0 or 1, 0≦n Ｎ１ +n Ｎ２ ≦3, n Ｎ１ = 2 or 3, 【Chemistry 7】 may be the same or different, Z Ｎ１ may be the same or different, A liquid crystal light control device.

2. The compound of the general formula N is 【Chemistry 8(1)】 【Chemistry 8(2)】 【Chemistry 8(3)】 is selected from the group consisting of compounds Preferably, the compound of general formula N is a compound selected from the group consisting of compounds of general formula N-2, compounds of general formula N-5, and compounds of general formula N-11. The liquid crystal light control device according to claim 1 .

3. 3. The liquid crystal light control device according to claim 1, wherein the liquid crystal component has a dielectric anisotropy of <0.

4. The liquid crystal light control device according to any one of claims 1 to 3, characterized in that the dichroic dye molecule is one or more dyes selected from the group consisting of uzo-based, anthraquinone-based, phthalocyanine, cyanine-based, indigoid, arylmethane, nitro group, and nitroso group.

5. The dichroic dye molecule is 【Chemistry 9(1)】 【Chemistry 9(2)】 【Chemistry 9(3)】 【Chemistry 9(4)】 5. The liquid crystal light modulating device according to claim 4, wherein the compound is selected from the group consisting of

6. 2. The liquid crystal light control device according to claim 1, wherein the chiral agent is an S-type chiral compound or an R-type chiral compound.

7. The liquid crystal light control device of claim 6, characterized in that the S-type chiral compound is selected from the group consisting of S1011, S2011, S5011, S811, and S6N chiral agents, and the R-type chiral compound is selected from the group consisting of R1011, R2011, R5011, R811, and R6N chiral agents.

8. The liquid crystal composition further comprises at least one compound represented by general formula M, 【Chemistry 10】 During the ceremony, R Ｍ１ and R Ｍ２ are each independently a straight or branched chain alkyl group containing 1 to 12 carbon atoms; 【Chemistry 11】 represents one or two or more non-adjacent —CH ２ Each - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 12】 are each independently 【Chemistry 13】 represents 【Chemistry 14】 At least one -CH ２ - may be replaced by -O-, and one or more single bonds in the ring may be replaced by a double bond; 【Chemistry 15】 at most one -H in 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 If = 2, then 【Chemistry 16】 may be the same or different, Z Ｍ２ may be the same or different, 8. The liquid crystal light control device according to claim 1, wherein the liquid crystal light control device is a liquid crystal light control device.

9. The compound of general formula M is 【Chemistry 17(1)】 【Chemistry 17(2)】 is selected from the group consisting of compounds Preferably, the compound of general formula M is a compound selected from the group consisting of a compound of general formula M-1, a compound of general formula M-2, a compound of general formula M-12, a compound of general formula M-16, a compound of general formula M-26, a compound of general formula M-27, a compound of general formula M-28, a compound of general formula M-29, a compound of general formula M-30, a compound of general formula M-31, a compound of general formula M-32, and a compound of general formula M-33; Preferably, the compound of general formula M includes at least one compound selected from the group consisting of a compound of general formula M-26, a compound of general formula M-27, a compound of general formula M-28, a compound of general formula M-29, a compound of general formula M-30, a compound of general formula M-31, a compound of general formula M-32, and a compound of general formula M-33. The liquid crystal light control device according to claim 8 .

10. A liquid crystal dimming device according to any one of claims 1 to 9, characterized in that the weight percentage of the compound of general formula N in the liquid crystal composition is 0.1% to 98%, and the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1% to 60%.

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