LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DISPLAY ELEMENT AND LIQUID CRYSTAL DISPLAY

Abstract

The present invention belongs to the technical field of liquid crystal materials, and in particular relates to a liquid crystal composition and a liquid crystal display element or liquid crystal display containing the liquid crystal composition. The present invention discloses a liquid crystal composition, comprising one or more compounds represented by Formula I, one or more compounds represented by Formula II, and one or more compounds represented by Formula III. The liquid crystal composition of the present invention has a large optical anisotropy and a small ratio of γ.sub.1/K.sub.11, and can be used for developing a liquid crystal display element or liquid crystal display with a low cell thickness and a fast response.

##STR00001##

Claims

1. A liquid crystal composition, comprising one or more compounds represented by Formula I, one or more compounds represented by Formula II, and one or more compounds represented by Formula III: ##STR00045## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8.

2. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises one or more compounds represented by Formula IV: ##STR00046## wherein R.sub.7 and R.sub.8 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8; and ##STR00047## each independently represent 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene.

3. The liquid crystal composition according to claim 2, wherein the liquid crystal composition further comprises one or more compounds represented by Formula V: ##STR00048## wherein R.sub.9 and R.sub.10 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8; ##STR00049## represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene; Z.sub.1 represents a single bond or —CH.sub.2O—; m represents 0 or 1; and when m represents 0, Z.sub.1 represents —CH.sub.2O—.

4. The liquid crystal composition according to claim 3, wherein the compound represented by Formula V is selected from the group consisting of compounds represented by Formulas V-1 to V-5: ##STR00050## wherein R.sub.9 and R.sub.10 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8.

5. The liquid crystal composition according to claim 2, wherein the liquid crystal composition further comprises one or more compounds represented by Formula VI: ##STR00051## wherein R.sub.11 and R.sub.12 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8; and ##STR00052## each independently represent 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene.

6. The liquid crystal composition according to claim 5, wherein the compound represented by Formula VI is selected from the group consisting of compounds represented by Formulas VI-1 to VI-3: ##STR00053## wherein R.sub.11 and R.sub.12 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8.

7. The liquid crystal composition according claim 1, wherein the liquid crystal composition further comprises one or more compounds represented by Formula VII: ##STR00054## wherein R.sub.13 and R.sub.14 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8, and any one or more —CH.sub.2— in the groups represented by R.sub.13 and R.sub.14 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; and X represents —O—, —S— or —CH.sub.2O—.

8. The liquid crystal composition according to claim 7, wherein the compound represented by Formula VII is selected from the group consisting of compounds represented by Formulas VII-1 to VII-12: ##STR00055## ##STR00056## wherein R.sub.131 and R.sub.141 each independently represent an alkyl with a carbon atom number of 1-10.

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

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

Description

DETAILED DESCRIPTION OF EMBODIMENTS

[0027] [Liquid Crystal Composition]

[0028] The present invention provides a liquid crystal composition, characterized in that the liquid crystal composition comprises one or more compounds represented by Formula I, one or more compounds represented by Formula II, and one or more compounds represented by Formula III:

##STR00008## [0029] wherein [0030] R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8.

[0031] The liquid crystal composition of the present invention has a large optical anisotropy and a small ratio of γ.sub.1/K.sub.11, and can be used for developing a liquid crystal display element or liquid crystal display with a low cell thickness and a fast response.

[0032] Preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula I is selected from the group consisting of compounds represented by Formulas I-1 to 1-12:

##STR00009## ##STR00010##

[0033] Further preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula I is selected from the group consisting of compounds represented by Formulas I-1 to 1-5:

##STR00011##

[0034] Preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula II is selected from the group consisting of compounds represented by Formulas II-1 to II-10:

##STR00012##

[0035] Further preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula II is selected from the group consisting of compounds represented by Formulas II-2 to II-4 and II-6 to II-8:

##STR00013##

[0036] Preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula III is selected from the group consisting of compounds represented by Formulas III-1 to III-6:

##STR00014##

[0037] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by Formula IV:

##STR00015## [0038] wherein

[0039] R.sub.7 and R.sub.8 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8; and

##STR00016## [0040] each independently represent 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene.

[0041] Preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula IV is selected from the group consisting of compounds represented by Formulas IV-1 to IV-17:

##STR00017## ##STR00018##

[0042] Further preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula IV is selected from the group consisting of compounds represented by Formulas IV-1 to IV-6:

##STR00019##

[0043] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by Formula V:

##STR00020## [0044] wherein [0045] R.sub.9 and R.sub.10 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8;

##STR00021## [0046] represents 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene; [0047] Z.sub.1 represents a single bond or —CH.sub.2O—; [0048] m represents 0 or 1; and when m represents 0, Z.sub.1 represents —CH.sub.2O—.

[0049] Preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula V is selected from the group consisting of compounds represented by Formulas V-1 to V-5:

##STR00022## [0050] wherein R.sub.9 and R.sub.10 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8.

[0051] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by Formula VI:

##STR00023## [0052] wherein [0053] R.sub.11 and R.sub.12 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8; and

##STR00024## [0054] each independently represent 1,4-phenylene, 1,4-cyclohexylene or 1,4-cyclohexenylene.

[0055] Preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula VI is selected from the group consisting of compounds represented by Formulas VI-1 to VI-3:

##STR00025## [0056] wherein R.sub.11 and Ru each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8.

[0057] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by Formula VII:

##STR00026## [0058] wherein [0059] R.sub.13 and R.sub.14 each independently represent an alkyl with a carbon atom number of 1-10, a fluoro-substituted alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10, a fluoro-substituted alkoxy with a carbon atom number of 1-10, an alkenyl with a carbon atom number of 2-10, a fluoro-substituted alkenyl with a carbon atom number of 2-10, an alkenoxy with a carbon atom number of 3-8, or a fluoro-substituted alkenoxy with a carbon atom number of 3-8, and any one or more —CH.sub.2— in the groups represented by R.sub.13 and R.sub.14 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; and [0060] X represents —O—, —S— or —CH.sub.2O—.

[0061] Preferably, in the liquid crystal composition of the present invention, the aforementioned compound represented by Formula VII is selected from the group consisting of compounds represented by Formulas VII-1 to VII-12:

##STR00027## ##STR00028## [0062] wherein [0063] R.sub.131 and R.sub.141 each independently represent an alkyl with a carbon atom number of 1-10.

[0064] As the aforementioned alkyl with a carbon atom number of 1-10, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, hexyl, heptyl, octyl, nonyl, decyl, etc. can be listed by for example.

[0065] As the aforementioned alkoxy with a carbon atom number of 1-10, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, pentoxy, hexyloxy, heptyloxy, octyloxy, nonoxy, decyloxy, etc. can be listed for example.

[0066] As the aforementioned alkenyl with a carbon atom number of 2-10, vinyl, 1-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, etc. can be listed for example.

[0067] In the aforementioned fluoro-substituted alkyl with a carbon atom number of 1-10, fluoro-substituted alkoxy with a carbon atom number of 1-10, fluoro-substituted alkenyl with a carbon atom number of 2-10, and fluoro-substituted alkenoxy with a carbon atom number of 3-8, the term “fluoro-substituted” can be monofluoro-substituted, or polyfluoro-substituted, such as difluoro-substituted and trifluoro-substituted, or may also be perfluoro-substituted, and there is no particular limitation on the number of the instances of fluorine substitution. For example, as the fluoro-substituted alkyl with a carbon atom number of 1-10, fluoromethyl, difluoromethyl, trifluoromethyl, 1-fluoroethyl, 2-fluoroethyl, 1,2-difluoroethyl, 1,1-difluoroethyl, 1,1,2-trifluoroethyl, 1,1,1,2,2-pentafluoro-substituted ethyl, etc. can be listed, for example, without limitation.

[0068] In the liquid crystal composition provided by the present invention, where the total mass of the liquid crystal composition is denoted as being 100%; if the liquid crystal composition only comprises the compounds represented by Formulas I and II, the total content of the compounds represented by Formulas I and II is denoted as being 100%.

[0069] Preferably, the liquid crystal composition comprises, by mass percentage: [0070] preferably 1-14% by mass of a compound represented by Formula I, and further [0071] preferably 3-9% by mass of a compound represented by Formula I; [0072] preferably 1-15% by mass of a compound represented by Formula II, and further preferably 3-10% by mass of a compound represented by Formula I; [0073] preferably 3-27% by mass of a compound represented by Formula III, and further preferably 7-15% by mass of a compound represented by Formula III; [0074] preferably 30-50% by mass of a compound represented by Formula IV, and further preferably 35-45% by mass of a compound represented by Formula IV; [0075] preferably 10-40% by mass of a compound represented by Formula V, and further preferably 13-33% by mass of a compound represented by Formula V; [0076] preferably 0-17% by mass of a compound represented by Formula VI, and further preferably 5-10% by mass of a compound represented by Formula VI; and [0077] preferably 0-15% by mass of a compound represented by Formula VII, and further preferably 5-10% by mass of a compound represented by Formula VII.

[0078] The mass percentage contents of the above-mentioned compounds represented by Formulas I to VII in the liquid crystal composition are only typical reference values for those skilled in the art to implement the technical solution of the present invention, rather than a specific limitation on the mass percentage content of each compound in the liquid crystal composition of the present invention. The scope of protection of the present invention is subject to the claims.

[0079] A variety of functional dopants may also be added to the liquid crystal composition of the present invention, and the content of the dopants is preferably 0.01% and 1% by mass. As the dopants, an antioxidant, an ultraviolet absorber and a chiral agent can be listed for example.

[0080] The antioxidant includes preferably

##STR00029## [0081] wherein t represents an integer from 1 to 10; and [0082] the chiral agent (levorotatory or dextrorotatory) includes preferably

##STR00030##

[0083] [Liquid Crystal Display Element or Liquid Crystal Display]

[0084] 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 or a passive matrix display element or display.

[0085] The liquid crystal display element or liquid crystal display of the present invention is preferably an active matrix addressing liquid crystal display element or liquid crystal display.

[0086] As the aforementioned active matrix display element or display, TN-TFT or IPS-TFT or FFS-TFT or VA-TFT liquid crystal display elements or other TFT displays can be specifically listed for example.

[0087] The liquid crystal display element or liquid crystal display comprising the liquid crystal composition disclosed by the present invention has the characteristics of a low cell thickness and a fast response speed.

EXAMPLES

[0088] In order to explain the present invention more clearly, the present invention will be further explained below in conjunction with 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.

[0089] In the description, 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: [0090] Cp represents the clear point (° C.) of a liquid crystal, as measured by DSC quantitative method; [0091] Δn represents optical anisotropy, n.sub.o is the refractive index of ordinary light and n.sub.e is the refractive index of extraordinary light, and the test conditions are 25° C.±2° C., 589 nm, and Abbe refractometer test;

[0092] 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° C.±0.5° C., 20 μm vertical cell, and INSTEC:ALCT-IR.sub.1 test; [0093] γ.sub.1 represents rotational viscosity (mPa.Math.s), and the test conditions are 25° C.±0.5° C., 20 μm vertical cell, and INSTEC:ALCT-IR.sub.1 test; [0094] K.sub.11 is splay elastic constant, K33 is bend elastic constant, and the test conditions are: 25° C., INSTEC:ALCT-IR.sub.1, and 20 μm vertical cell; and [0095] 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 [00031] C [00032] P [00033] L [00034] G [00035] Gi [00036] Y [00037] Sb [00038] Sc

TABLE-US-00002 TABLE 2 Corresponding codes of terminal groups and linker groups Terminal groups and linker groups Corresponding code C.sub.nH.sub.2n + .sub.1— n— C.sub.nH.sub.2n + .sub.1O— nO— —CF.sub.3 —T —OCF.sub.3 —OT —CH.sub.2O— —O— —F —F —CH.sub.2CH.sub.2— —E— —CH═CH— —V— —CH═CH—C.sub.nH.sub.2n + .sub.1 Vn— —C≡C— —W— [00039] Cp— [00040] Cpr— [00041] Cpr1— [00042] CpO [00043] CprO

[0096] For example:

##STR00044##

Example 1

[0097] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 3 below.

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 PPY-5-O2 5 I PPY-3-O2 5.5 II CPWP-3-2 3 II CPWP-5-2 2 III PY-3-O2 9.5 III PY-1-O2 5 IV CC-3-V 41 V CPY-3-O2 11.5 V COY-3-O2 7 V CCY-3-O2 10.5 Δε [1 KHz, 25° C.]: −2.6 Δn [589 nm, 25° C.]: 0.117 K.sub.11: 13.9 K.sub.33: 14.7 Cp: 81° C. γ.sub.1: 52 mPa .Math. s γ.sub.1/K.sub.11: 3.7

[0098] Example 2

[0099] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 4 below.

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 PPY-5-O2 3 I PPY-3-O2 3.5 I PPY-3-O4 3.5 I PPY-5-O4 2 II CPWP-3-2 3 III PY-2O-O2 5 III PY-1-O2 3 IV CC-3-V 35 IV CC-2-3 11 V CCY-3-O2 8 V CCY-5-O2 5 V CLY-3-O2 2 V CLY-4-O2 2 VI CPP-V-1 9 VII Sc-2O-O4 5 Δε [1 KHz, 25° C.]: −2.1 Δn [589 nm, 25° C.]: 0.112 K.sub.11: 16.1 K.sub.33: 16.5 Cp: 93° C. γ.sub.1: 63 mPa .Math. s γ.sub.1/K.sub.11: 3.9

Example 3

[0100] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 5 below.

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 PPY-3-O2 3 I PPY-5-O2 5 II CPWP-3-O2 5 II CPWP-3-2 3.5 III PY-3-O2 9 III PY-1-O2 3 IV CC-3-V 29 IV CC-2-3 7 IV PP-5-1 7 V CPY-3-O2 10.5 V CLY-3-O2 3 V CCOY-3-O2 7 VII Sb-4O-O4 3 VII Sc-2O-O4 5 Δε [1 KHz, 25° C.]: −2.9 Δn [589 nm, 25° C.]: 0.133 K.sub.11: 15.1 K.sub.33: 14.4 Cp: 82° C. γ.sub.1: 68 mPa .Math. s γ.sub.1/K.sub.11: 4.5

Example 4

[0101] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 6 below.

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 PPY-5-O2 3 I PPY-3-O2 2.5 II CPWP-3-O2 5 II CPWP-3-2 3 II CPWP-3-O1 3 III PY-3-O2 7 III PY-2O-O4 3 IV CC-3-V 19 IV CC-2-3 13.5 IV PP-5-1 7 IV CP-3-O2 2 V CPY-3-O2 6.5 V CCOY-3-O2 7 VI CPP-3-2 5 VII Sc-CpO-O4 7 VII Sb-CpO-O4 6.5 Δε [1 KHz, 25° C.]: −3.5 Δn [589 nm, 25° C.]: 0.136 K.sub.11: 16.2 K.sub.33: 13.0 Cp: 81° C. γ.sub.1: 76 mPa .Math. s γ.sub.1/K.sub.11: 4.7

Example 5

[0102] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 7 below.

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 PPY-5-O2 3 II CPWP-3-O2 5 II CPWP-3-2 5 II CPWP-4-O2 2 II CPWP-3-O1 3 III PY-3-O2 7 III PY-2O-O2 5.5 IV CC-3-V 35 IV CC-3-V1 2.5 IV CC-2-3 3 V CPY-3-O2 7.5 V CCOY-3-O2 11.5 VI CPP-3-2 3 VII Sb-4O-O4 7 Δε [1 KHz, 25° C.]: −2.3 Δn [589 nm, 25° C.]: 0.128 K.sub.11: 16.0 K.sub.33: 15.8 Cp: 95° C. γ.sub.1: 78 mPa .Math. s γ.sub.1/K.sub.11: 4.8

Example 6

[0103] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 8 below.

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 PPY-3-O2 3 I PPY-5-O2 2 II CPWP-3-2 5 III PY-3-O2 5 III PY-1-O2 3 IV CC-3-V 35 V CPY-3-O2 9 V COY-3-O2 11.5 V COY-3-O1 5 V CCOY-3-O2 7 V CLY-3-O2 3.5 VI CPP-3-2 9 VI CCP-V-1 2 Δε [1 KHz, 25° C.]: −2.7 Δn [589 nm, 25° C.]: 0.110 K.sub.11: 13.3 K.sub.33: 13.9 Cp: 80° C. γ.sub.1: 56 mPa .Math. s γ.sub.1/K.sub.11: 4.2

Example 7

[0104] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 9 below.

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 PPY-3-O2 2 I PPY-3-O4 2 II CPWP-3-2 2 III PY-3-O2 5 IV CC-3-V 13 IV CC-2-3 15 IV PP-5-1 3 V COY-3-O2 13.5 V CCOY-3-O2 9.5 V CPY-3-O2 7 V CLY-3-O2 3 VI CPP-3-2 7.5 VI CCP-V-1 8 VII Sc-CpO-O4 6.5 VII Sb-CpO-O4 3 Δε [1 KHz, 25° C.]: −4.2 Δn [589 nm, 25° C.]: 0.112 K.sub.11: 15.1 K.sub.33: 13.7 Cp: 79° C. γ.sub.1: 84 mPa .Math. s γ.sub.1/K.sub.11: 5.6

[0105] Example 8

[0106] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 10 below.

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 PPY-5-O2 2 II CPWP-3-2 3 III PY-3-O2 5.5 III PY-1-O2 2 IV CC-3-V 37 V CPY-3-O2 11.5 V CCOY-3-O2 13.5 V COY-3-O2 3 V CLY-3-O2 5 VI CPP-3-2 3 VI CPP-1V-2 6.5 VI CCP-V-1 4 VII Sb-4O-O4 4 Δε [1 KHz, 25° C.]: −2.5 Δn [589 nm, 25° C.]: 0.113 K.sub.11: 15.6 K.sub.33: 17.3 Cp: 96° C. γ.sub.1: 74 mPa .Math. s γ.sub.1/K.sub.11: 4.7

Example 9

[0107] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 11 below.

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 PPY-5-O2 3.5 II CPWP-3-O2 5 III PY-20-O2 3 III PY-1-O2 3.5 IV CC-3-V 10.5 IV CC-2-3 25 IV CC-5-3 5 IV PP-5-1 7 V CPY-3-O2 11.5 V CCOY-4-O2 7.5 V CLY-3-O2 3 V CLY-4-O2 2 V CCY-3-O2 7 VI CPP-5-2 6.5 Δε [1 KHz, 25° C.]: −2.6 Δn [589 nm, 25° C.]: 0.115 K.sub.11: 17.6 K.sub.33: 16.6 Cp: 93° C. γ.sub.1: 88 mPa .Math. s γ.sub.1/K.sub.11: 5.0

Example 10

[0108] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 12 below.

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 PPY-5-O2 5 I PPY-3-O2 3 I PPY-3-O4 3.5 II CPWP-3-2 5 II CPWP-4-O2 2 II CPWP-3-O1 2 III PY-3-O2 13.5 III PY-2O-O2 5 III PY-2O-O4 7 IV CC-3-V 35 IV CC-2-3 7.5 V CPY-3-O2 11.5 Δε [1 KHz, 25° C.]: −2.5 Δn [589 nm, 25° C.]: 0.131 K.sub.11: 14.3 K.sub.33: 13.7 Cp: 79° C. γ.sub.1: 56 mPa .Math. s γ.sub.1/K.sub.11: 4.0

[0109] Example 11

[0110] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 13 below.

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 PPY-5-O2 3 I PPY-3-O2 3 I PPY-3-O4 3 II CPWP-3-2 3.5 III PY-3-O2 7.5 III PY-2O-O4 3 III PY-2O-O2 5 IV CC-3-V 25 IV CC-2-3 13.5 V CPY-3-O2 11.5 V CCOY-3-O2 11 V CLY-3-O2 3.5 VI CPP-3-2V1 7.5 Δε [1 KHz, 25° C.]: −3.0 Δn [589 nm, 25° C.]: 0.125 K.sub.11: 17.0 K.sub.33: 18.8 Cp: 95° C. γ.sub.1: 86 mPa .Math. s γ.sub.1/K.sub.11: 5.0

Example 12

[0111] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 14 below.

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 PPY-5-O2 2.5 I PPY-3-O2 2.5 II CPWP-3-2 3 III PY-3-O2 9.5 III PY-2O-O2 5 III PY-2O-O4 7 III PY-1-O2 3 IV CC-3-V 30 IV CC-2-3 9.5 V CPY-3-O2 13.5 VI CPP-1V-2 7 VII Sb-CpO-O4 7.5 Δε [1 KHz, 25° C.]: −3.2 Δn [589 nm, 25° C.]: 0.126 K.sub.11: 13.0 K.sub.33: 12.7 Cp: 70° C. γ.sub.1: 55 mPa .Math. s γ.sub.1/K.sub.11: 4.2

Comparative Example 1

[0112] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 15 below.

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 (%) PGiY-3-O2 5 II CPWP-3-2 5 III PY-3-O2 5 III PY-1-O2 3 IV CC-3-V 35 V CPY-3-O2 9 V COY-3-O2 11.5 V COY-3-O1 5 V CCOY-3-O2 7 V CLY-3-O2 3.5 VI CPP-3-2 9 VI CCP-V-1 2 Δε [1 KHz, 25° C.]: −2.6 Δn [589 nm, 25° C.]: 0.108 K.sub.11: 12.8 K.sub.33: 13.8 Cp: 77° C. γ.sub.1: 59 mPa .Math. s γ.sub.1/K.sub.11: 4.6

[0113] The compound represented by Formula I in Example 6 was replaced by PGiY-3-O2, as Comparative Example 1.

Comparative Example 2

[0114] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 16 below.

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 PPY-3-O2 3 I PPY-5-O2 2 CGPC-3-3 5 III PY-3-O2 5 III PY-1-O2 3 IV CC-3-V 35 V CPY-3-O2 9 V COY-3-O2 11.5 V COY-3-O1 5 V CCOY-3-O2 7 V CLY-3-O2 3.5 VI CPP-3-2 9 VI CCP-V-1 2 Δε [1 KHz, 25° C.]: −2.7 Δn [589 nm, 25° C.]: 0.105 K.sub.11: 13.1 K.sub.33: 14.5 Cp: 82° C. γ.sub.1: 61 mPa .Math. s γ.sub.1/K.sub.11: 4.7

[0115] The compound represented by Formula II in Example 6 was replaced by CGPC-3-3, as Comparative Example 2.

Comparative Example 3

[0116] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 17 below.

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 PPY-3-O2 3 I PPY-5-O2 2 II CPWP-3-2 5 CY-3-O2 5 CY-1-O2 3 IV CC-3-V 35 V CPY-3-O2 9 V COY-3-O2 11.5 V COY-3-O1 5 V CCOY-3-O2 7 V CLY-3-O2 3.5 VI CPP-3-2 9 VI CCP-V-1 2 Δε [1 KHz, 25° C.]: −2.5 Δn [589 nm, 25° C.]: 0.104 K.sub.11: 13.0 K.sub.33: 13.7 Cp: 80° C. γ.sub.1: 60 mPa .Math. s γ.sub.1/K.sub.11: 4.6

[0117] The compound represented by Formula III in Example 6 was replaced by CY-3-O2 and CY-3-O1, as Comparative Example 3.

Comparative Example 4

[0118] The formula and corresponding properties of the liquid crystal compositions were as shown in Table 18 below.

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 (%) PGiY-3-O2 3 PGiY-5-O2 2 CGPC-3-3 5 CY-3-O2 5 CY-1-O2 3 IV CC-3-V 35 V CPY-3-O2 9 V COY-3-O2 11.5 V COY-3-O1 5 V CCOY-3-O2 7 V CLY-3-O2 3.5 VI CPP-3-2 9 VI CCP-V-1 2 Δε [1 KHz, 25° C.]: −2.6 Δn [589 nm, 25° C.]: 0.098 K.sub.11: 12.4 K.sub.33: 14.6 Cp: 81° C. γ.sub.1: 64 mPa .Math. s γ.sub.1/K.sub.11: 5.2

[0119] Comparative Example 4 did not comprise the compounds represented by Formulas I, II and III of the present invention.

[0120] Compared with Comparative Examples 1, 2, 3 and 4, the liquid crystal composition examples of the present invention had a large optical anisotropy and a small γ.sub.1/K.sub.11 while maintaining a proper dielectric anisotropy and an appropriate clearing point, and could be used for developing a liquid crystal display element or liquid crystal display with a low cell thickness and a fast response.

[0121] The liquid crystal composition of the present invention had a large optical anisotropy and a small γ.sub.1/K.sub.11 while maintaining an appropriate dielectric anisotropy and clearing point, and could be used for developing a liquid crystal display element or liquid crystal display with a low cell thickness and a fast response.

[0122] The above examples disclosed by 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.