LIQUID CRYSTAL COMPOSITION WITH GOOD FREQUENCY DEPENDENCE AND LIQUID CRYSTAL DISPLAY ELEMENT

Abstract

The present invention belongs to the technical field of liquid crystal materials, and in particular relates to a liquid crystal composition with good frequency dependence and a liquid crystal display element or liquid crystal display containing the liquid crystal composition. The liquid crystal composition of the present invention comprises a compound represented by Formula I, a compound represented by Formula II and a compound represented by Formula III, wherein the mass percentage content of the compound represented by Formula I is not less than 30%. The liquid crystal composition provided by the present invention has an appropriate optical anisotropy, an appropriate dielectric anisotropy, especially a relatively low rotational viscosity, a good low-temperature mutual solubility and a good reliability, especially good frequency dependence.

##STR00001##

Claims

1. A liquid crystal composition with good frequency dependence, comprising a compound represented by Formula I, wherein the mass percentage content of the compound represented by Formula I in the liquid crystal composition is not less than 30%; and the liquid crystal composition further comprises one or more compounds represented by Formula II and one or more compounds represented by Formula III ##STR00070## wherein in Formula II, R.sub.1 and R.sub.2 each independently represent an alkoxy with a carbon atom number of 1-10 or an alkenoxy with a carbon atom number of 2-10; and when R.sub.1 and R.sub.2 each independently represent an alkoxy with a carbon atom number of 2-10 or an alkenoxy with a carbon atom number of 2-10, any one of the hydrogen atoms thereof can be replaced by F; and R.sub.3 represents an alkyl with a carbon atom number of 1-10; and R.sub.3′ represents an alkenyl with a carbon atom number of 2-10.

2. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises one or more compounds represented by Formula IV: ##STR00071## wherein in Formula IV, R.sub.4 represents an alkyl with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10; R.sub.4′ represents an alkyl with a carbon atom number of 1-10 or an alkoxy with a carbon atom number of 1-10; and ##STR00072## represents ##STR00073##

3. The liquid crystal composition according to claim 1, wherein the liquid crystal composition comprises one or more compounds represented by Formula V: ##STR00074## wherein in Formula V, R.sub.5 represents an alkyl with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10; R.sub.5′ represents an alkyl with a carbon atom number of 1-10 or an alkoxy with a carbon atom number of 1-10; and ##STR00075## represents ##STR00076## and Z.sub.1 represents a single bond, —CH.sub.2O— or —CH.sub.2CH.sub.2—.

4. The liquid crystal composition according to claim 1, wherein the compound represented by Formula II in the liquid crystal composition is selected from the group consisting of compounds represented by Formulas II-A, II-B, II-C, II-D, II-E, II-F, II-G, II-H, and II-I: ##STR00077##

5. The liquid crystal composition according to claim 1, wherein the compound represented by Formula III in the liquid crystal composition is selected from the group consisting of compounds represented by Formulas III-A, III-B, III-E, and III-F: ##STR00078##

6. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises one or more compounds represented by Formula IV other than those represented by Formula I: ##STR00079## wherein in Formula VI, R.sub.6 and R.sub.6′ each independently represent an alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10; ##STR00080## represents ##STR00081## and n represents 1 or 2 or 3; and when n represents 2 or 3, two or three ##STR00082## may be the same or different.

7. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises one or more compounds represented by Formula VII and/or one or more compounds represented by Formula VIII: ##STR00083## wherein R.sub.7, R.sub.7′, R.sub.8 and R.sub.8′ each independently represent an alkyl with a carbon atom number of 1-10 and an alkoxy with a carbon atom number of 1-10; and X.sub.1 and X.sub.2 each independently represent H or F.

8. A liquid crystal display element or a liquid crystal display, characterized by comprising the liquid crystal composition according to claim 1, wherein the liquid crystal display element or liquid crystal display is an active matrix addressing display element or display or a passive matrix addressing display element or display.

Description

DETAILED DESCRIPTION OF EMBODIMENTS

[0012] The present invention provides a liquid crystal composition with good frequency dependence, the liquid crystal composition comprising a compound represented by Formula I, wherein the mass percentage content of the compound represented by Formula I in the liquid crystal composition is not less than 30%; and the liquid crystal composition further comprises one or more compounds represented by Formula II and one or more compounds represented by Formula III

##STR00003##

[0013] wherein in Formula II,

[0014] R.sub.1 and R.sub.2 each independently represent an alkoxy with a carbon atom number of 1-10 or an alkenoxy with a carbon atom number of 2-10; and when R.sub.1 and R.sub.2 each independently represent an alkoxy with a carbon atom number of 2-10 or an alkenoxy with a carbon atom number of 2-10, any one of the hydrogen atoms thereof can be replaced by F; and

[0015] R.sub.3 represents an alkyl with a carbon atom number of 1-10; and R.sub.3′ represents an alkenyl with a carbon atom number of 2-10.

[0016] As for the liquid crystal composition of the present invention, preferably, the compound represented by Formula II in the above-mentioned liquid crystal composition is selected from the group consisting of compounds represented by Formulas II-A, II-B, II-C, II-D, II-E, II-F, II-G, II-H, and II-I:

##STR00004##

[0017] As for the liquid crystal composition of the present invention, preferably, the mass content of the above-mentioned compound represented by Formula II in the liquid crystal composition is 3-15%.

[0018] As for the liquid crystal composition of the present invention, preferably, the compound represented by Formula III in the above-mentioned liquid crystal composition is selected from the group consisting of compounds represented by Formulas III-A, III-B, III-E, and III-F:

##STR00005##

[0019] As for the liquid crystal composition of the present invention, further preferably, the above-mentioned compound represented by Formula III is selected from compounds represented by Formula III-A and/or IIIB, and the mass content thereof in the liquid crystal composition is 2-10%, still further preferably 5-10%.

[0020] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by Formula IV:

##STR00006##

[0021] wherein in Formula IV,

[0022] R.sub.4 represents an alkyl with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10;

[0023] R.sub.4′ represents an alkyl with a carbon atom number of 1-10 or an alkoxy with a carbon atom number of 1-10; and

##STR00007##

represents

##STR00008##

[0024] As for the liquid crystal composition of the present invention, preferably, the above-mentioned compound represented by Formula IV is selected from the group consisting of compounds represented by the following Formulas IV-1 to IV-56:

##STR00009## ##STR00010## ##STR00011## ##STR00012## ##STR00013## ##STR00014##

[0025] As for the liquid crystal composition of the present invention, further preferably, the above-mentioned liquid crystal composition comprises at least three compounds represented by Formula IV.

[0026] As for the liquid crystal composition of the present invention, preferably, the above-mentioned liquid crystal composition comprises one or more compounds represented by Formula V:

##STR00015##

[0027] wherein in Formula V,

[0028] R.sub.5 represents an alkyl with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10;

[0029] R.sub.5′ represents an alkyl with a carbon atom number of 1-10 or an alkoxy with a carbon atom number of 1-10; and

##STR00016##

represents nd

##STR00017##

and

[0030] Z.sub.1 represents a single bond, —CH.sub.2O— or —CH.sub.2CH.sub.2—.

[0031] As for the liquid crystal composition of the present invention, further preferably, the above-mentioned compound represented by Formula V is selected from the group consisting of compounds represented by the following Formulas V-1 to V-32:

##STR00018## ##STR00019## ##STR00020##

[0032] As for the liquid crystal composition of the present invention, preferably, the above-mentioned liquid crystal composition further comprises one or more compounds represented by Formula VI other than the compound represented by Formula I

##STR00021##

[0033] wherein in Formula VI,

[0034] R.sub.6 and R.sub.6′ each independently represent an alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10;

##STR00022##

represents

##STR00023##

and

[0035] n represents 1 or 2 or 3; and when n represents 2 or 3, two or three

##STR00024##

may be the same or different.

[0036] As for the liquid crystal composition of the present invention, preferably, the above-mentioned compound represented by Formula VI is selected from the group consisting of compounds represented by the following Formulas VI-1 to VI-36:

##STR00025## ##STR00026## ##STR00027##

[0037] As for the liquid crystal composition of the present invention, preferably, the above-mentioned liquid crystal composition further comprises one or more compounds represented by Formula VII and/or compounds represented by Formula VIII:

##STR00028##

[0038] wherein

[0039] R.sub.7, R.sub.7′, R.sub.8 and R.sub.8′ each independently represent an alkyl with a carbon atom number of 1-10 and an alkoxy with a carbon atom number of 1-10; and

[0040] X.sub.1 and X.sub.2 each independently represent H or F.

[0041] As for the liquid crystal composition of the present invention, preferably, the above-mentioned compound represented by Formula VII is selected from the group consisting of compounds represented by the following Formulas VII-1 to VII-28:

##STR00029## ##STR00030## ##STR00031##

[0042] As for the liquid crystal composition of the present invention, preferably, the above-mentioned compound represented by Formula VIII is selected from the group consisting of compounds represented by the following Formulas VIII-1 to VIII-3:

##STR00032##

[0043] As for the liquid crystal composition of the present invention, further preferably, the liquid crystal composition comprises 3-5% by mass of the compound represented by Formula VIII-1.

[0044] As for the liquid crystal composition of the present invention, preferably, the above-mentioned liquid crystal composition comprises one or more compounds represented by Formula IX:

##STR00033##

[0045] wherein in Formula IX,

[0046] R.sub.9 represents an alkoxy with a carbon atom number of 1-10 and an alkyl with a carbon atom number of 1-10, or

##STR00034##

[0047] R.sub.10 represents an alkoxy with a carbon atom number of 1-10 or an alkyl with a carbon atom number of 1-10; and

[0048] X represents O or S.

[0049] As for the liquid crystal composition of the present invention, preferably, the above-mentioned compound represented by Formula IX is selected from the group consisting of compounds represented by the following Formulas IX-1 to IX-12:

##STR00035## ##STR00036##

[0050] As for the liquid crystal composition of the present invention, preferably, various functional dopants may also be added to the above-mentioned liquid crystal compound.

[0051] As for the liquid crystal composition of the present invention, preferably, the above-mentioned dopants are mainly antioxidants, light stabilizers, etc.

[0052] As for the liquid crystal composition of the present invention, preferably, the mass percentage content of the above-mentioned dopants is preferably between 0.01% and 1%.

[0053] As for the liquid crystal composition of the present invention, preferably, the above-mentioned antioxidant is selected from one or more of compounds represented by Formulas T-1 to T-4:

##STR00037##

[0054] wherein S represents an integer of 1-10.

[0055] As for the liquid crystal composition of the present invention, preferably, the compounds represented by Formulas T-1 to T-4 as the above-mentioned antioxidant are selected from the group consisting of compounds represented by Formulas T-1-1 to T-4-6:

##STR00038## ##STR00039## ##STR00040## ##STR00041##

[0056] As for the liquid crystal composition of the present invention, preferably, the above-mentioned light stabilizer is selected from the group consisting of compounds represented by the following Formulas T-5 and/or T-6:

##STR00042##

[0057] wherein

[0058] S represents an integer of 1-10.

[0059] [Liquid Crystal Display Element or Liquid Crystal Display]

[0060] The present invention further relates to a liquid crystal display element or liquid crystal display comprising any one of the above-mentioned liquid crystal compositions; and the display element or display is an active matrix display element or display.

[0061] The above-mentioned active matrix display element or display can be specifically exemplified by, for example, IPS-TFT or FFS-TFT or VA-TFT liquid crystal display elements or other TFT displays, especially liquid crystal display elements or liquid crystal displays in which FFS-TFT mode is applied.

[0062] The liquid crystal display element or liquid crystal display of the present invention comprises the liquid crystal composition disclosed in the present invention. The liquid crystal display element or liquid crystal display of the present invention is mainly applied to the fields of TV, MNT, NB, Mobile, industrial control and vehicles, medical panels, etc.

EXAMPLES

[0063] In order to explain the present invention more clearly, the present invention will be further explained below in conjunction with preferred examples. A person skilled in the art should understand that the following detailed description is illustrative rather than restrictive, and should not limit the scope of protection of the present invention.

[0064] In the present invention, the preparation methods are all conventional methods unless otherwise specified, the raw materials used can all be obtained from open commercial channels unless otherwise specified, the percentages all refer to mass percentages, the temperatures are degrees Celsius (° C.), and the specific meanings and test conditions of the other symbols are as follows:

[0065] Cp represents the clearing point (° C.) of a liquid crystal, as measured by DSC quantitative method;

[0066] Δn represents optical anisotropy, with Δn=ne−no, wherein no is the refractive index of ordinary light and ne is the refractive index of extraordinary light, and the test conditions are 25±2° C., 589 nm, and Abbe refractometer test;

[0067] V10 represents the voltage (V) at which the transmittance changes from 0% to 10% in the normally black mode and at which the transmittance changes from 100% to 90% in the normally white mode and the test conditions are 10±0.5° C. and 0±0.5° C., FFS cell and DMS test;

[0068] Δε represents dielectric anisotropy, Δε=ε.sub.//−ε.sub.⊥, wherein ε.sub.// is the dielectric constant parallel to the molecular axis, and ε.sub.⊥ is the dielectric constant perpendicular to the molecular axis, and the test conditions are 25±0.5° C., 20 μm antiparallel cell, and INSTEC:ALCT-IR1 test;

[0069] γ.sub.1 represents rotational viscosity (mPa.Math.s), and the test conditions are 25±0.5° C. and −20±0.5° C., 20 μm vertical cell, and INSTEC:ALCT-IR1 test;

[0070] K.sub.11 is splay elastic constant, K.sub.33 is bend elastic constant, and the test conditions are: 25±0.5° C., INSTEC:ALCT-IR1, and 20 μm antiparallel cell; and

[0071] The preparation method for the liquid crystal composition involves: weighing various liquid crystal monomers at a certain ratio and putting the liquid crystal monomers into a stainless steel beaker, placing the stainless steel beaker containing these liquid crystal monomers on a magnetic stirring instrument for heating and melting, adding a magnetic rotor to the stainless steel beaker when most of the liquid crystal monomers in the stainless steel beaker have melted, uniformly stirring the mixture, and cooling the mixture to room temperature to obtain the liquid crystal composition.

[0072] The structures of the liquid crystal monomers in the examples of the present invention are represented by codes, and the code representation method for liquid crystal ring structures, terminal groups and linker groups is shown in Tables 1 and 2 below.

TABLE-US-00001 TABLE 1 Corresponding codes of ring structures Ring structure Corresponding code [00043] C [00044] L [00045] P [00046] G [00047] Gi [00048] Y [00049] B [00050] Sb [00051] Sc

TABLE-US-00002 TABLE 2 Corresponding codes of terminal groups and linker groups Terminal groups and linker Corresponding groups code C.sub.nH.sub.2n+1— n- C.sub.nH.sub.2n+1O— nO— —CH.sub.2O— —O— —F —F —CH.sub.2CH.sub.2— -E- —CH═CH— —V— —COO— —COO— —CH═CH—C.sub.nH.sub.2n+l —Vn [00052] Cp- [00053] CpO— [00054] Cpr- [00055] Cpr1-

[0073] For example:

##STR00056##

the code of which is CC-Cp-V1;

##STR00057##

the code of which is PPY-3-O2;

##STR00058##

the code of which is CPY-2-O2;

##STR00059##

the code of which is CCY-3-O2;

##STR00060##

the code of which is COY-3-O2;

##STR00061##

the code of which is CCOY-3-O2;

##STR00062##

the code of which is CLY-3-O2;

##STR00063##

the code of which is Sb—CpO—O4;

##STR00064##

the code of which is Sc—CpO—O4;

##STR00065##

the code of which is PGP-Cpr1-2;

##STR00066##

the code of which is B-2O—O4;

##STR00067##

the code of which is B-CpO—O4

##STR00068##

the code of which is CY-3-O2;

##STR00069##

the code of which is PP-1-2V.

[0074] The following specific examples are used to illustrate the present invention:

EXAMPLES

Example 1

[0075]

TABLE-US-00003 TABLE 3 Formula and corresponding properties of the liquid crystal composition of Example 1 Class Code of liquid crystal monomer Content (%) I CC-3-V 32 II B-2O-O4 3 II B-5O-O2 5 II B-5O-O4 5 III PP-2-2V1 6 IV CPY-3-O2 8 IV CPY-2-O2 9 IV CCY-3-O2 5 IV CLY-3-O2 4 V CY-3-O2 15 VII PPY-5-O2 3 VIII PYP-2-3 5 Properties Cp: 76.1° C. Δn: 0.127 Δε: −3.9 γ.sub.1: 85.2 mPa .Math. s K.sub.11: 14.8 K.sub.33: 14.3

Example 2

[0076]

TABLE-US-00004 TABLE 4 Formula and corresponding properties of the liquid crystal composition of Example 2 Class Code of liquid crystal monomer Content (%) I CC-3-V 35 II B-5O-O2 5 III PP-1-2V1 3 IV CPY-3-O2 8 IV CCY-2-O2 8 IV CLY-3-O2 7 IV CLY-2-O4 7 V COY-3-O2 5 V PY-1-O2 10 VI CC-3-V1 5 VII PPY-3-O2 2 IX Sc-CpO-O2 5 Properties Cp: 74.8° C. Δn: 0.113 Δε: −4.5 γ.sub.1: 76 mPa .Math. s K.sub.11: 14.6 K.sub.33: 14.7

Example 3

[0077]

TABLE-US-00005 TABLE 5 Formula and corresponding properties of the liquid crystal composition of Example 3 Class Code of liquid crystal monomer Content (%) I CC-3-V 42 II B-2O-O5 3 III PP-1-2V1 5 IV CPY-3-O2 8 IV CPY-5-O2 3 IV CCY-3-O2 5 IV CCY-3-O1 3 V PY-3-O2 11 VI CCP-3-1 4 VI CPP-1V-2 4 VI CC-3-V1 5 IX Sc-CpO-O4 7 Properties Cp: 73.3° C. Δn: 0.107 Δε: −2.3 γ.sub.1: 45 mPa .Math. s K.sub.11: 14.4 K.sub.33: 15.0

Example 4

[0078]

TABLE-US-00006 TABLE 6 Formula and corresponding properties of the liquid crystal composition of Example 4 Class Code of liquid crystal monomer Content (%) I CC-3-V 36 II B-4O-O2 2 II B-2O-O5 5 III PP-2-2V 3 IV CPY-3-O2 6 IV CPY-3-O4 4 IV CCY-2-O2 4 IV CCY-3-O2 4 IV CLY-3-O2 5 IV CLY-3-O3 3 IV CLY-2-O4 4 V CY-3-O2 5 V COY-3-O2 10 VI CC-3-V1 3 VII PGiY-3-O2 2 VII PPY-3-O4 1 VIII PYP-2-3 3 Properties Cp: 77.9° C. Δn: 0.107 Δε: −4.0 γ.sub.1: 74.9 mPa .Math. s K.sub.11: 14.4 K.sub.33: 15.8

Example 5

[0079]

TABLE-US-00007 TABLE 7 Formula and corresponding properties of the liquid crystal composition of Example 5 Class Code of liquid crystal monomer Content (%) I CC-3-V 33 II B-2O-O5 5 II B-5O-O2 5 III PP-1-2V 3 IV CPY-3-O2 10 IV CCY-2-O2 10 IV CCEY-3-O2 7 IV CLY-4-O2 4 IV CLY-2-O4 5 V PY-3-O2 8 V CY-3-O2 10 Properties Cp: 80.1° C. Δn: 0.111 Δε: −4.7 γ.sub.1: 91.8 mPa .Math. s K.sub.11: 15.3 K.sub.33: 15.6

Example 6

[0080]

TABLE-US-00008 TABLE 8 Formula and corresponding properties of the liquid crystal composition of Example 6 Class Code of liquid crystal monomer Content (%) I CC-3-V 30 II B-3O-O4 4 III PP-1-2V1 5 III PP-1-2V 5 IV CPY-3-O2 12 IV CCY-2-O2 3 IV CCY-3-O2 10 IV CLY-3-O2 1 IV CCOY-3-O2 5 IV CCOY-2-O2 5 V COY-3-O2 11 VI CC-2-3 3 VI CC-3-V1 5 VII PPY-3-O2 1 Properties Cp: 75.2° C. Δn: 0.104 Δε: −4.1 γ.sub.1: 79.3 mPa .Math. s K.sub.11: 15.2 K.sub.33: 15.9

Example 7

[0081]

TABLE-US-00009 TABLE 9 Formula and corresponding properties of the liquid crystal composition of Example 7 Class Code of liquid crystal monomer Content (%) I CC-3-V 40 II B-2O-O5 5 II B-3O-O5 5 II B-4O-O5 5 III PP-1-2V1 8 III PP-3-2V1 4 IV CPY-3-O2 9 IV CLY-4-O2 5 IV CLY-3-O2 7 IV CLY-2-O4 6 V COY-3-O2 6 Properties Cp: 75.0° C. Δn: 0.110 Δε: −3.8 γ.sub.1: 65.4 mPa .Math. s K.sub.11: 15.4 K.sub.33: 14.2

Example 8

[0082]

TABLE-US-00010 TABLE 10 Formula and corresponding properties of the liquid crystal composition of Example 8 Class Code of liquid crystal monomer Content (%) I CC-3-V 48 II B-5O-O2 6 IX Sc-CpO-O4 5 IX Sc-CpO-O2 5 III PP-3-2V 2 IV CPY-3-O2 9 IV CLY-4-O2 4 IV CLY-3-O2 7 IV CLY-2-O4 4 V PY-2-O2 8 VII PGiY-2-O4 2 Properties Cp: 75.0° C. Δn: 0.110 Δε: −3.7 γ.sub.1: 63.5 mPa .Math. s K.sub.11: 14.8 K.sub.33: 13.5

Example 9

[0083]

TABLE-US-00011 TABLE 11 Formula and corresponding properties of the liquid crystal composition of Example 9 Class Code of liquid crystal monomer Content (%) I CC-3-V 37 II B-5O-O2 6 III PP-1-2V1 10 IV CPY-3-O2 9 IV CPY-4-O2 4 IV CPY-3-O4 4 IV CLY-3-O2 8 V PY-2O-O2 6 V PY-1-O2 9 CPPC-3-3 2 VII PPY-3-O2 2 IX Sc-CpO-O4 3 Properties Cp: 74.0° C. Δn: 0.130 Δε: −3.4 γ.sub.1: 70.0 mPa .Math. s K.sub.11: 15.1 K.sub.33: 15.9

Example 10

[0084]

TABLE-US-00012 TABLE 12 Formula and corresponding properties of the liquid crystal composition of Example 10 Class Code of liquid crystal monomer Content (%) I CC-3-V 41 II B-5O-O2 6 III PP-1-2V1 10 V CY-3-O2 6 V PY-2O-O2 6 V PY-1-O2 9 CPPC-3-3 2 VII PPY-3-O2 2 IX Sc-CpO-O4 3 IX Sc-2O-O4 8 IX Sb-2O-O5 7 Properties Cp: 74.2° C. Δn: 0.131 Δε: −3.4 γ.sub.1: 71.2 mPa .Math. s K.sub.11: 15.3 K.sub.33: 16.1

Example 11

[0085]

TABLE-US-00013 TABLE 13 Formula and corresponding properties of the liquid crystal composition of Example 11 Class Code of liquid crystal monomer Content (%) I CC-3-V 41 II B-5O-O2 6 III PP-1-2V1 5 V CY-3-O2 6 V PY-2O-O2 6 V PY-1-O2 9 CPPC-3-3 2 VII PPY-3-O2 2 IX Sc-CpO-O4 3 IX Sc-2O-O4 8 IX Sb-2O-O5 7 PP-1-3 5 Properties Cp: 74.1° C. Δn: 0.131 Δε: −3.4 γ.sub.1: 71.2 mPa .Math. s K.sub.11: 15.3 K.sub.33: 16.1

Example 12

[0086]

TABLE-US-00014 TABLE 14 Formula and corresponding properties of the liquid crystal composition of Example 12 Class Code of liquid crystal monomer Content (%) I CC-3-V 37 II B-5O-O2 6 III PP-1-2V1 10 V CY-3-O2 6 V PY-2O-O2 6 V PY-1-O2 9 VI CC-3-V1 4 CPPC-3-3 2 VII PPY-3-O2 2 IX Sc-CpO-O4 3 IX Sc-2O-O4 8 IX Sb-2O-O5 7 Properties Cp: 74.0° C. Δn: 0.130 Δε: −3.4 γ.sub.1: 71.2 mPa .Math. s K.sub.11: 15.2 K.sub.33: 16.1

Comparative Example 1

[0087]

TABLE-US-00015 TABLE 15 Formula and corresponding properties of the liquid crystal composition of Comparative Example 1 Class Code of liquid crystal monomer Content (%) I CC-3-V 34 IX Sc-CpO-O4 5 IX Sb-CpO-O4 4 PP-1-3 3 IV CPY-3-O2 10 IV CCY-2-O2 10 IV CCEY-3-O2 7 IV CLY-4-O2 4 IV CLY-2-O4 5 V PY-3-O2 8 V CY-3-O2 10 Properties Cp: 78.8° C. Δn: 0.110 Δε: −4.7 γ.sub.1: 90.5 mPa .Math. s K.sub.11: 14.7 K.sub.33: 15.1

Comparative Example 2

[0088]

TABLE-US-00016 TABLE 16 Formula and corresponding properties of the liquid crystal composition of Comparative Example 2 Class Code of liquid crystal monomer Content (%) I CC-3-V 34 II B-5O-O2 3 IX Sc-CpO-O4 6 PP-1-5 10 IV CPY-3-O2 9 IV CPY-4-O2 4 IV CPY-3-O4 4 IV CLY-3-O2 8 V PY-2O-O2 6 V PY-1-O2 9 VI CCP-V-1 3 VI CPPC-3-3 2 VII PPY-3-O2 2 Properties Cp: 74.0° C. Δn: 0.130 Δε: −3.4 γ.sub.1: 74.1 mPa .Math. s K.sub.11: 14.9 K.sub.33: 15.4

Comparative Example 3

[0089]

TABLE-US-00017 TABLE 17 Formula and corresponding properties of the liquid crystal composition of Comparative Example 3 Class Code of liquid crystal monomer Content (%) I CC-3-V 46 IX Sb-CpO-O4 5 IX Sc-CpO-O4 6 IX Sc-CpO-O2 5 PP-2-5 2 IV CPY-3-O2 9 IV CLY-4-O2 4 IV CLY-3-O2 7 IV CLY-2-O4 4 V PY-2-O2 8 VI CCP-V-1 2 VII PGiY-2-O4 2 Properties Cp: 75.0° C. Δn: 0.110 Δε: −3.7 γ.sub.1: 65.8 mPa .Math. s K.sub.11: 14.9 K.sub.33: 13.5

Comparative Example 4

[0090]

TABLE-US-00018 TABLE 18 Formula and corresponding properties of the liquid crystal composition of Comparative Example 4 Class Code of liquid crystal monomer Content (%) I CC-3-V 25 II B-2O-O4 3 II B-5O-O2 5 II B-5O-O4 5 PP-2-3 6 IV CPY-3-O2 8 IV CPY-2-O2 9 IV CCY-3-O2 5 IV CLY-3-O2 4 V CY-3-O2 15 VI CC-3-V1 7 VII PPY-5-O2 3 VIII PYP-2-3 5 Properties Cp: 75.8° C. Δn: 0.127 Δε: −3.9 γ.sub.1: 88.5 mPa .Math. s K.sub.11: 14.7 K.sub.33: 14.4

[0091] Frequency Dependence Experiment:

[0092] Samples of Examples 1 to 12 and Comparative Examples 1 to 4 were respectively taken and poured into 3.2 μm FFS test cells and tested for V10 under 128 Hz and 10000 Hz conditions at 10° C. and 0° C.

Voltage change rate=V10(10000 Hz)/V10(128 Hz)

[0093] The smaller the value of the V10 voltage change rate, the better the frequency dependence. The specific data were as shown in Tables 19 and 20. Compared with the comparative examples, the examples in which the liquid crystal composition of the present invention was used had better frequency dependence.

TABLE-US-00019 TABLE 19 Voltage change rate data at 10° C. V 10 V 10 Voltage Condition (10000 Hz) (128 Hz) change rate (%) Example 1 2.58 2.50 1.030 Example 2 2.42 2.34 1.033 Example 3 3.16 3.10 1.020 Example 4 2.51 2.50 1.003 Example 5 2.39 2.36 1.012 Example 6 2.51 2.47 1.017 Example 7 2.61 2.56 1.019 Example 8 2.59 2.54 1.020 Example 9 2.75 2.68 1.027 Example 10 2.82 2.73 1.033 Example 11 2.77 2.68 1.034 Example 12 2.86 2.77 1.032 Comparative 2.34 2.26 1.035 Example 1 Comparative 2.74 2.63 1.041 Example 2 Comparative 2.68 2.56 1.049 Example 3 Comparative 2.57 2.48 1.038 Example 4

TABLE-US-00020 TABLE 20 Voltage change rate data at 0° C. V 10 V 10 Voltage Condition (10000 Hz) (128 Hz) change rate (%) Example 1 2.64 2.50 1.056 Example 2 2.48 2.34 1.059 Example 3 3.24 3.10 1.045 Example 4 2.57 2.50 1.028 Example 5 2.45 2.36 1.037 Example 6 2.57 2.47 1.042 Example 7 2.67 2.56 1.044 Example 8 2.66 2.54 1.046 Example 9 2.82 2.68 1.053 Example 10 2.89 2.73 1.059 Example 11 2.84 2.68 1.060 Example 12 2.91 2.75 1.058 Comparative 2.40 2.26 1.061 Example 1 Comparative 2.81 2.63 1.067 Example 2 Comparative 2.75 2.56 1.075 Example 3 Comparative 2.64 2.48 1.064 Example 4

[0094] The above examples of the present invention are only to clearly illustrate the instances of the present invention, rather than defining the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can also be made on the basis of the above description. It is impossible to exhaustively list all the embodiments here, and all obvious changes or variations that are derived from the technical solution of the present invention are still within the scope of protection of the present invention.