Patent Grant
11773327
The present invention relates to the field of liquid crystal material, particularly to a PSA-type liquid crystal composition and a display device having the same.
Liquid crystal displays (LCDs) have gained rapid development due to their small size, light weight, low power consumption and excellent display quality, and in particular, have been widely used in portable electronic information products. Based on the displaying mode, liquid crystal displays can be classified into the types of PC (phase change), TN (twisted nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), FFS (fringe field switching), VA (vertical alignment), PSA (polymer stable alignment), and the like.
A PSA-type liquid crystal display device is manufactured by adding a small amount (such as 0.3 wt %, typically, <1 wt %) of one or more polymerizable compounds into a liquid crystal composition, filling the same into a liquid crystal cell, and polymerizing, usually via a UV photopolymerization, or crosslinking the polymerizable compounds in suit under a condition where liquid crystal molecules are initially aligned with or without a voltage applied between electrodes, thereby fixing the alignment of the liquid crystal molecules. The polymerization is carried out at a temperature where the liquid crystal composition exhibits a liquid crystal phase, usually at room temperature. It has been proven that the addition of polymerizable liquid crystal compounds to a liquid crystal composition is particularly suitable since the polymer structure formed by the polymerizable liquid crystal compounds in the unit can well control the tilt angle of liquid crystal molecules, and that the PSA-type liquid crystal display device has a high response speed and a high contrast.
Therefore, PSA-type liquid crystal display device is continuously developed, and the PSA principle is also used in various conventional liquid crystal displays, such as the known PSA-VA, PSA-OCB, PSA-IPS, PSA-FFS, and PSA-TN displays. Like the conventional LC displays, PSA displays can be operated as active-matrix or passive-matrix displays. In the case of active-matrix displays, individual pixels are usually addressed by integrated, non-linear active elements, such as transistors, while in the case of passive-matrix displays, individual pixels are usually addressed by the multiplex method, as known from the prior art.
However, there are some display defects such as image sticking in PSA-type liquid crystal display device. Studies have shown that such problems are mostly caused by the presence of impurities and changes in the alignment of liquid crystal molecules (changes in the pretilt angle), and the alignment of liquid crystal molecules is controlled by a polymer network formed by the polymerization of polymerizable compounds. If the structural rigidity of the polymerizable compounds constituting the polymer network is insufficient, the structure of the polymer network may change when the PSA-type liquid crystal display device continuously displays the same pattern for a long time, thereby causing the changes in the pretilt angle of liquid crystal molecules. Therefore, it is generally necessary to select a polymerizable compound having a rigid structure.
In order to prevent image sticking by improving the rigidity of a polymer, it has been investigated to constitute a display device using a polymerizable compound having a structure of 1,4-phenylene group or the like, which contains only a ring structure and a polymerizable functional group (refer to Patent Literature JP2003307720A), or constitute a display device using a polymerizable compound having a biaryl structure (refer to Patent Literature JP2008116931A). However, such polymerizable compounds have low compatibility with liquid crystal compounds and thus, when a liquid crystal composition containing a polymerizable compound is prepared, the problems such as precipitation of the polymerizable compound are produced, leading to the need for improvement in compatibility with the liquid crystal composition.
Moreover, it has been proposed to constitute a display device using a mixed liquid crystal composition containing a bifunctional polymerizable compound and a tri- or higher-functional polymerizable compound, such as dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, or the like (refer to Patent Literature JP2004302096A). However, dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate have no ring structure in the molecules thereof and thus have weak affinity for liquid crystal compounds and weak force to regulate alignment, thereby causing the problem of failing to achieve satisfactory alignment stability. In addition, polymerization of these polymerizable compounds requires a polymerization initiator to be added, and if a polymerization initiator is not added, the polymerizable compounds remain after polymerization.
In order to further improve the response speed, various combinations of liquid crystal compositions and polymerizable compounds are also disclosed in the prior art (see Patent Literature WO2010084823A1). However, a relation between the pretilt angle and response speed is generally known, and a significant improvement effect has not been confirmed. Since liquid crystal compounds containing an alkenyl group and chlorine atom are used, a defective display is highly likely to be caused, and there will also result in environmental issues.
Therefore, there is a need for developing a PSA-type liquid crystal composition, which has no precipitation of polymerizable compounds in a wide temperature range, has a rapid response speed and has no display defects such as image sticking, and a liquid crystal display device having the same.
Objects: In view of the defects in the prior art, it is an object of the present invention to provide a PSA-type liquid crystal composition, which has good intersolubility, high response speed and has no display defects such as image sticking. It is another object of the present invention to provide a display device comprising the PSA-type liquid crystal composition above.
In order to achieve the above objects, the present invention provides a PSA-type liquid crystal composition comprising a host liquid crystal A and a polymerizable component B, wherein the host liquid crystal A comprises one or more liquid crystal compounds, and the polymerizable component B comprises at least one compound selected from a group consisting of the compounds of general formula I-1, general formula I-2 and general formula I-3:
in which,
ring A, ring B, ring C, ring D, ring E, ring F, ring G, ring H and ring I each independently represents phenylene or naphthylene;
X1-1, X1-2, X1-3, X2-1, X2-2, X2-3, X2-4, X3-1, X3-2, X3-3, X3-4 and X3-5 each independently represents a single bond, or a C1-12 linear or branched alkylene, wherein one or more —CH2— in the C1-12 linear or branched alkylene can be replaced by —O—, —S—, —NH—, —CO—, —CH═CH— or —C≡C— in a manner that heteroatoms are not directly connected to each other, —H in one or more —CH2— in the C1-12 linear or branched alkylene can be substituted by halogen, and wherein at least one of X1-1, X1-2 and X1-3 represents a single bond, at least one of X2-1, X2-2, X2-3 and X2-4 represents a single bond, and at least one of X3-1, X3-2, X3-3, X3-4 and X3-5 represents a single bond;
RA, RB, RC, RD, RE, RF, RG, RH and RI each independently represents halogen, or a C1-5 halogenated or unhalogenated linear or branched alkyl or alkoxy;
P1-1, P1-2, P2-1, P2-2, P3-1 and P3-2 each independently represents a polymerizable group;
a, b, c, d, e, f, g, h and i each independently represents 0, 1, 2 or 3, and when a is 2 or 3, RA can be same or different; when b is 2 or 3, RB can be same or different; when c is 2 or 3, RC can be same or different; when d is 2 or 3, RD can be same or different; when e is 2 or 3, RE can be same or different; when f is 2 or 3, RF can be same or different; when g is 2 or 3, RG can be same or different; when h is 2 or 3, RH can be same or different; when i is 2 or 3, RI can be same or different;
a+b+n1≥1, and n1≥1, wherein n1 represents the number of groups that are not single bond in X1-1, X1-2 and X1-3;
c+d+e+n2≥2, and n2≥1, wherein n2 represents the number of groups that are not single bond in X2-1, X2-2, X2-3 and X2-4; and
f+g+h+i+n3≥3, and n3≥1, wherein n3 represents the number of groups that are not single bond in X3-1, X3-2, X3-3, X3-4 and X3-5.
In some embodiments of the present invention, ring A, ring B, ring C, ring D, ring E, ring F, ring G, ring H and ring I preferably each independently represents phenylene.
In some embodiments of the present invention, X1-1, X1-2, X1-3, X2-1, X2-2, X2-3, X2-4, X3-1, X3-2, X3-3, X3-4 and X3-5 each independently preferably represents a single bond, —CH2O—, —OCH2—, —CO—O—, —O—CO—, —CH2CH2—, —(CH2)3—, —(CH2)4—, —(CH2)2O—, —(CH2)3O—, —O(CH2)3—, —O—, —CF2—, —CF2O—, —OCF2—, —CH(CH3)CH2—, —C(CH3)2CH2—, —CH2C(CH3)2—, —C(CH3)2CH(CH3)—, —C(CH3)2C(CH3)2—, —C(CH3)2O—, —OC(CH3)2—, —CH(CH2CH3)CH2—, —O—, —S—, —NH—, —NH—CO—O—, —O—CO—NH—, —SCH2—, —CH2S—, —CH═CH—, —C≡C—, —CH═CH—CO—O— or —O—CO—CH═CH—.
In some embodiments of the present invention, RA, RB, RC, RD, RE, RF, RG, RH and RI each independently preferably represents —F, —CH2F, —CHF2, —CF3, —CH3, —OCH3, —CH2CH3 or —OCH2CH3.
In some embodiments of the present invention, P1-1, P1-2, P2-1, P2-2, P3-1 and P3-2 each independently preferably represents
In some embodiments of the present invention, a+b+n1≥2; c+d+e+n2≥3; and f+g+h+i+n3≥4.
In some embodiments of the present invention, X1-2, X2-2, X2-3, X3-2, X3-3 and X3-4 each independently represents a single bond, —CH2O—, —OCH2—, —CH2CH2—, —(CH2)3—, —(CH2)4—, —(CH2)3O—, —O(CH2)3—, —O—, —CF2—, —CF2O—, —OCF2—, —CH(CH3)CH2—, —C(CH3)2CH2—, —CH2C(CH3)2—, —C(CH3)2CH(CH3)—, —C(CH3)2C(CH3)2—, —C(CH3)2O—, —OC(CH3)2—, —CH(CH2CH3)CH2—, —S—, —NH—, —NH—CO—O—, —O—CO—NH—, —SCH2—, —CH2S—, —CH═CH—, —C≡C—, —CH═CH—CO—O— or —O—CO—CH═CH—.
In some embodiments of the present invention, if X1-2 represents —CO— or —O—CO—, then a+b≠0; if both X2-2 and X2-3 represent —CO— or —O—CO—, then c+d+e≠0; if all of X3-2, X3-3 and X3-4 represent —CO— or —O—CO—, then f+g+h+i 0.
In some embodiments of the present invention, both X1-1 and X1-3 represent single bond, and X1-2 represents —CH2O—, —OCH2—, —CO—O—, —O—CO—, —CH2CH2—, —(CH2)3—, —(CH2)4—, —(CH2)3O—, —O(CH2)3—, —O—, —CF2—, —CF2O—, —OCF2—, —CH(CH3)CH2—, —C(CH3)2CH2—, —CH2C(CH3)2—, —C(CH3)2CH(CH3)—, —C(CH3)2C(CH3)2—, —C(CH3)2O—, —OC(CH3)2—, —CH(CH2CH3)CH2—, —S—, —NH—, —NH—CO—O—, —O—CO—NH—, —SCH2—, —CH2S—, —CH═CH—, —C≡C—, —CH═CH—CO—O— or —O—CO—CH═CH—.
In some embodiments of the present invention, the polymerizable component B only comprises one compound of general formula I-1, wherein both X1-1 and X1-3 represent single bond, X1-2 represents —CH2O—, —OCH2—, —CO—O—, —O—CO—, —CH2CH2—, —(CH2)3—, —(CH2)4—, —(CH2)3O—, —O(CH2)3—, —O—, —CF2—, —CF2O—, —OCF2—, —CH(CH3)CH2—, —CH2C(CH3)2—, —C(CH3)2CH2—, —C(CH3)2CH(CH3)—, —C(CH3)2C(CH3)2—, —C(CH3)2O—, —OC(CH3)2—, —CH(CH2CH3)CH2—, —S—, —NH—, —NH—CO—O—, —O—CO—NH—, —SCH2—, —CH2S—, —CH═CH—, —C≡C—, —CH═CH—CO—O— or —O—CO—CH═CH—, and a+b≠0.
In some embodiments of the present invention, if the polymerizable component B comprises one compound of general formula I-1 in which a+b+n1=1, it at least further comprises another compound selected from the group consisting of the compounds of general formula I-1, general formula I-2 and general formula I-3.
In some embodiments of the present invention, at least one of X2-1 and X2-4 represents a single bond; and when both X2-1 and X2-4 represent single bond, at least one of X2-2 and X2-3 is not a single bond, and c+d+e≥1.
In some embodiments of the present invention, if the polymerizable component B comprises two or three polymerizable compounds, and at least one of two or three polymerizable compounds is selected from the compounds of general formula I-2, at least one of X2-1 and X2-4 represents a single bond; and when both X2-1 and X2-4 represent single bond, at least one of X2-2 and X2-3 is not a single bond, and c+d+e≥1.
In some embodiments of the present invention, at least one of X3-1 and X3-5 represents a single bond; and when both X3-1 and X3-5 are single bond, at least one of X3-2, X3-3 and X3-4 is not a single bond, and f+g+h+i≥2; when only one of X3-1 and X3-5 represents a single bond, at most one of X3-2, X3-3 and X3-4 is not a single bond, and f+g+h+i≥2.
In some embodiments of the present invention, if the polymerizable component B comprises two or three polymerizable compounds, and at least one of two or three polymerizable compounds is selected from the compounds of general formula I-3, at least one of X3-1 and X3-5 represents a single bond; and when both X3-1 and X3-5 are single bond, at least one of X3-2, X3-3 and X3-4 is not a single bond, and f+g+h+i≥2; when only one of X3-1 and X3-5 represents a single bond, at most one of X3-2, X3-3 and X3-4 is not a single bond, and f+g+h+i≥2.
In some embodiments of the present invention, the compound of general formula I-1 is selected from a group consisting of the following compounds:
In which, RA, RB, a and b each can be same or different and has one of the meanings indicated above or below.
In some embodiments of the present invention, the compound of general formula I-2 is selected from a group consisting of the following compounds:
In which, RC, RD, RE, c, d and e each can be same or different and has one of the meanings indicated above or below.
In some embodiments of the present invention, the compound of general formula I-3 is selected from a group consisting of the following compounds:
In which, RF, RG, RH, RI, f, g, h and i each can be same or different and has one of the meanings indicated above or below.
In general formula I-1-1 to general formula I-1-24, general formula I-2-1 to general formula-2-56, and general formula I-3-1 to general formula I-3-20 above,
each independently preferably represents a group selected from a group consisting of the following groups:
In some embodiments of the present invention, the polymerizable component B provides 0.01-5% of the total weight of the PSA-type liquid crystal composition; preferably, the polymerizable component B provides 0.05-4% of the total weight of the PSA-type liquid crystal composition; further preferably, the polymerizable component B provides 0.1-3% of the total weight of the PSA-type liquid crystal composition.
In some embodiments of the present invention, the host liquid crystal A comprises one or more compounds of general formula M:
in which,
RM1 and RM2 each independently represents a C1-12 linear or branched alkyl,
one or more nonadjacent —CH2— in the C1-12 linear or branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
ring M1, ring M2 and ring M3 each independently represents
wherein one or more —CH2— in
can be replaced by —O—, and at most one —H on
can be substituted by halogen;
ZM1 and ZM2 each independently represents a single bond, —CO—O—, —O—CO—, —CH2O—, —OCH2—, —CH═CH—, —C≡C—, —CH2CH2—, —(CH2)4—, —CF2O—, —OCF2— or —CF2CF2—; and
nM1 represents 0, 1, 2 or 3, and when nM1=2 or 3, ring M2 can be same or different, and ZM2 can be same or different.
In some embodiments of the present invention, in the compound of general formula M, RM1 and RM2 are preferably each independently a C1-10 linear alkyl, a C1-9 linear alkoxy, or a C2-10 linear alkenyl; further preferably, a C1-8 linear alkyl, a C1-7 linear alkoxy, or a C2-8 linear alkenyl; still further preferably, a C1-5 linear alkyl, a C1-4 linear alkoxy, or a C2-5 linear alkenyl.
In some embodiments of the present invention, preferably, RM1 and/or RM2 are each independently a C2-8 linear alkenyl, further preferably, a C2-5 linear alkenyl.
In some embodiments of the present invention, preferably, one of RM1 and RM2 is a C2-5 linear alkenyl, while the other is a C1-5 linear alkyl.
In some embodiments of the present invention, both RM1 and RM2 are preferably a C1-8 linear alkyl, or a C1-7 linear alkoxy; further preferably, a C1-5 linear alkyl, or a C1-4 linear alkoxy.
In some embodiments of the present invention, preferably, one of RM1 and RM2 is a C1-5 linear alkyl, while the other is a C1-5 linear alkyl or a C1-4 linear alkoxy; further preferably, both RM1 and RM2 are a C1-5 linear alkyl.
The alkenyl group in the present invention is preferably selected from the groups represented by any one of formula (V1) to formula (V9), particularly formula (V1), formula (V2), formula (V8) or formula (V9). The groups represented by formula (V1) to formula (V9) are as follows:
in which, * represents bound carbon atom in the ring structure.
The alkenoxy group in the present invention is preferably selected from the groups represented by any one of formula (OV1) to formula (OV9), particularly formula (OV1), formula (OV2), formula (OV8) or formula (OV9). The groups represented by formula (OV1) to formula (OV9) are as follows:
in which, * represents bound carbon atom in the ring structure.
In some embodiments of the present invention, the compound of general Formula M is selected from a group consisting of the following compounds:
In some embodiments of the present invention, the compound of general formula M is preferably selected from a group consisting of the compounds of general formula M1, general formula M2, general formula M4, general formula M9, general formula M11, general formula M20 and general formula M21.
The preferred lower limit of the content of the compound of general formula M is 1%, 10%, 20%, 30%, 40% or 50%, relative to the total weight of the PSA-type liquid crystal composition of the present invention; and the preferred upper limit of the content of the compound of general formula M is 95%, 85%, 75%, 65%, 60%, 55%, 45%, 35% or 25%, relative to the total weight of the PSA-type liquid crystal composition of the present invention.
Regarding the content of the compound of general formula M, the lower and the upper limits thereof are preferably higher when it is desired to maintain the PSA-type liquid crystal composition of the present invention with lower viscosity and shorter response time; further, the lower and the upper limits thereof are preferably higher when it is desired to maintain the PSA-type liquid crystal composition of the present invention with higher clearing point and good temperature stability; the lower and the upper limits thereof are preferably lowered in order to maintain lower driving voltage and make the absolute value of the dielectric anisotropy larger.
With emphasis in reliability, both RM1 and RM2 are preferably each independently alkyl; with emphasis in reducing the volatility of the compound, both RM1 and RM2 are preferably each independently alkoxy; and with emphasis in reducing the viscosity, at least one of RM1 and RM2 is preferably alkenyl.
In some embodiments of the present invention, the host liquid crystal A at least comprises one or more compounds selected from a group consisting of the compounds of general formula M1-a, general formula M1-b and general formula M1-c:
In some embodiments of the present invention, the host liquid crystal A further comprises one or more compounds of general formula N:
in which
RN1 and RN2 each independently represents a C1-12 linear or branched alkyl,
one or more nonadjacent —CH2— in the C1-12 linear or branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—, and one or more —H presented on these groups can each be independently substituted by —F or —Cl;
ring
and ring
each independently represents
wherein one or more —CH2— in
can be replaced by —O—, one or at most two single bonds in the ring can be replaced by double bond, wherein one or more —H on
can be substituted by —F or —Cl, and one or more —CH═ in the ring can be replaced by —N═;
ZN1 and ZN2 each independently represents a single bond, —CO—O—, —O—CO—, —CH2O—, —OCH2—, —CH═CH—, —C≡C—, —CH2CH2—, —(CH2)4—, —CF2O—, —OCF2— or —CF2CF2—; and
nN1 represents 0, 1, 2 or 3, nN2 represents 0 or 1, and 0≤nN1+nN2≤3, and when nN1=2 or 3, ring
can be same or different, and ZN1 can be same or different.
In some embodiments of the present invention, in the compound of general formula N, RN1 and RN2 are preferably each independently a C1-8 alkyl or alkoxy, or a C2-8 alkenyl or alkenoxy; further preferably, a C1-5 alkyl or alkoxy, or a C2-5 alkenyl or alkenoxy;
RN1 is further preferably a C1-5 alkyl, or a C2-5 alkenyl, still further preferably, a C2-5 alkyl or a C2-3 alkenyl;
RN2 is further preferably a C1-4 alkoxy; and
ring
and ring
are preferably
In some embodiments of the present invention, the compound of general formula N is selected from a group consisting of the following compounds:
In some embodiments of the present invention, the compound of general Formula N is preferably selected from a group consisting of the compounds of general formula N2, general formula N3, general formula N5, general formula N8, general formula N12 and general formula N14.
In some embodiments of the present invention, the PSA-type liquid crystal composition of the present invention preferably comprises one or more compounds of general Formula N; more preferably one or more compounds selected from a group consisting of the compounds of general formula N2 to general formula N7, and general formula N10 to general Formula N21; and further preferably two to ten compounds selected from a group consisting of the compounds of general formula N2 to general formula N7, and general formula N10 to general Formula N21.
Regarding the preferred content of the compound of general formula N: the preferred lower limit of the content of the compound of general Formula N is 0.1%, 0.5%, 1%, 3%, 5%, 10%, 13%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38% or 40%, relative to the total weight of the PSA-type liquid crystal composition of the present invention; and the preferred upper limit of the content of the compound of general formula N is 95%, 90%, 88%, 85%, 83%, 80%, 78%, 75%, 73%, 70%, 68%, 65%, 63%, 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% or 10%, relative to the total weight of the PSA-type liquid crystal composition of the present invention.
Regarding the preferred content of the compound of general formula N: the lower and the upper limits thereof are preferably lower when it is desired to maintain the PSA-type liquid crystal composition of the present invention with lower viscosity and shorter response time; further, the lower and the upper limits thereof are preferably lower when it is desired to maintain the PSA-type liquid crystal composition of the present invention with higher clearing point and good temperature stability; furthermore, the lower and the upper limits thereof are preferably increased in order to maintain lower driving voltage and make the absolute value of the dielectric anisotropy larger.
In some embodiments of the present invention, the PSA-type liquid crystal composition further comprises one or more additives known to the skilled artisan in the art and described in the literatures.
Stabilizers which can be added to the PSA-type liquid crystal composition according to the present invention are mentioned below.
The stabilizer is preferably selected from the stabilizers as shown below.
In some embodiments of the present invention, preferably, the stabilizer provides 0-5% of the total weight of the PSA-type liquid crystal composition; more preferably, the stabilizer provides 0-1% of the total weight of the PSA-type liquid crystal composition; particularly preferably, the stabilizer provides 0.01-0.1% of the total weight of the PSA-type liquid crystal composition.
In another aspect, the present invention further provides a liquid crystal display device comprising the PSA-type liquid crystal composition provided by the present invention.
By improving the functional groups of the polymerizable compound (including a linking group between the rings, a substituent group on the ring, and a linking group between the polymerizable group and the ring), the PSA-type liquid crystal composition provided by the present invention effectively improves the intersolubility between the polymerizable component and the host liquid crystal, such that the liquid crystal composition can maintain a nematic phase state without crystallization even in a low-temperature environment, and there is no crystallization and the performance changes caused thereby during transportation and manufacturing. The PSA-type liquid crystal composition of the present invention has extremely low viscosity, which can meet the requirements of a liquid crystal display device with a fast response speed (such as a 3D display). In addition, the polymerizable compound of the present invention has an appropriate polymerization speed which is not too fast or too slow during photopolymerization, such that an uniform and stable alignment control can be achieved, and a liquid crystal display device in which image sticking and display unevenness occur less or not at all can be provided. In conclusion, the PSA-type liquid crystal composition provided by the present invention has better intersolubility, cannot be crystallized at a low-temperature environment, can form a stable pretilt angle, and inhibits the occurrence of a display defect, such as Zara Particle, during the polymerization.
The present invention will be illustrated by combining the detailed embodiments below. It should be noted that, the following examples are exemplary embodiments of the present invention, which are only used to illustrate the present invention, not to limit it. Other combinations and various modifications within the conception of the present invention are possible without departing from the subject matter and scope of the present invention.
Unless specifically indicated, in the present invention, all ratios are weight ratios, and all temperatures are degree centigrade.
For the convenience of the expression, the group structures of the liquid crystal compositions in the following Examples are represented by the codes listed in Table 1′:
Take the compound with the following structural formula as an example:
Represented by the codes listed in Table A, this structural formula can be expressed as nCCGF, in which, n in the code represents the number of the carbon atoms of the alkyl group on the left, for example, n is “3”, meaning that the alkyl is —C3H7; C in the code represents cyclohexyl, G represent 2-fluoro-1,4-phenylene, F represents fluorine.
The abbreviated codes of the test items in the following Examples are represented as follows:
In which,
The optical anisotropy is tested and obtained by using an Abbe Refractometer under a sodium lamp (589 nm) light source at 25° C.
Δε=εI-ε⊥, in which, εI is a dielectric constant parallel to the molecular axis, ε⊥ is a dielectric constant perpendicular to the molecular axis, with the test conditions: 25° C., 1 KHz, TN90-type test cell with a cell gap of 7 μm.
γ1 is tested by a TOYO6254-type liquid crystal physical property evaluation system; the test temperature is 25° C., and the test voltage is 90 V.
The components used in the following Examples can either be synthesized by method known in the art or be obtained commercially. The synthetic techniques are conventional, and each of the obtained liquid crystal compounds is tested to meet the standards of electronic compound.
The nematic host liquid crystal Host 1 is prepared according to Table 1 below.
The nematic host liquid crystal Host 2 is prepared according to Table 2 below.
The nematic host liquid crystal Host 3 is prepared according to Table 3 below.
The nematic host liquid crystal Host 4 is prepared according to Table 4 below.
The nematic host liquid crystal Host 5 is prepared according to Table 5 below.
The nematic host liquid crystal Host 6 is prepared according to Table 6 below.
The nematic host liquid crystal Host 7 is prepared according to Table 7 below.
The nematic host liquid crystal Host 8 is prepared according to Table 8 below.
The nematic host liquid crystal Host 9 is prepared according to Table 9 below.
The nematic host liquid crystal Host 10 is prepared according to Table 10 below.
The nematic host liquid crystal Host 11 is prepared according to Table 11 below.
The nematic host liquid crystal Host 12 is prepared according to Table 12 below.
The nematic host liquid crystal Host 13 is prepared according to Table 13 below.
The nematic host liquid crystal Host 14 is prepared according to Table 14 below.
Examples of PSA-Type Liquid Crystal Composition
The PSA-type liquid crystal compositions of Examples 1-308 are prepared by adding the compounds in Table 15 to the nematic host liquid crystals Host 1 to Host 14 at the concentrations shown in Tables 17-30 respectively, and then tested for relevant performance parameters by filling the same into a VA-type test cell.
For comparison purposes, the PSA-type liquid crystal compositions of Comparative Examples 1-39 are prepared by adding the polymerizable compounds M1 and M2 known in the prior art to the nematic host liquid crystal Host 1 to Host 14 at the concentrations shown in Table 16 respectively, and then tested for relevant performance parameters by filling the same into a VA-type test cell.
As can be seen from the data of the above Comparative Examples and Examples, the PSA-type liquid crystal composition provided by the present invention has better intersolubility, cannot be crystallized at a low temperature, can form a stable pretilt angle, and avoids the occurrence of a display defect, such as Zara Particle, during the polymerization.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and provided for facilitating the understanding and practice of the present invention by those skilled in the art. However, the protection scope of the invention is not limited thereto. Equivalent variations or modifications made without departing from the spirit and essence of the present invention are intended to be contemplated within the protection scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910304707.4 | Apr 2019 | CN | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 8425800 | Hirata | Apr 2013 | B2 |
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